JP2010178594A - Power supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply apparatus, capable of reducing power consumption during the standby state of a voltage doubler/full-wave rectifying switching circuit, and preventing the malfunction of a changeover switch. <P>SOLUTION: The power supply apparatus includes a rectifying means, a first switch SW1 which switches the rectifying means to a full-wave rectifying mode or a voltage doubler rectifying mode, a first switch control means CT1 which controls on/off operations of the first switch SW1, and an input voltage detecting means 2 which detects a voltage level of an AC power supply and supplies an output signal according to the AC voltage level to the first switch control means CT1. Only when an input voltage level detected by the input voltage detecting means 2 is not greater than a first upper limit value, and a standby releasing signal 3 is input from outside, the first switch control means CT1 turns on the first switch SW1. As another variation, an output voltage detecting means 5 instead of the input voltage detecting means 2, or both of these voltage detecting means can be used. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply device that converts an AC voltage output from an AC power supply into a DC voltage and supplies it to a load, and in particular, has a rectifier circuit that switches rectification of AC voltage between a full-wave rectification method and a voltage doubler rectification method. The present invention relates to a power supply device.

    For example, a power supply device that obtains a DC voltage by inputting an AC voltage, such as a commercial AC power supply, includes a rectifier circuit that rectifies and smoothes the AC voltage to obtain a DC voltage (rectified and smoothed voltage) before stabilization. As such a rectifier circuit, a rectifier circuit that is compatible with AC 100 V and AC 200 V commercial AC power supplies is known (for example, Patent Document 1).

  In this rectifier circuit, when AC100V commercial AC power is input, switching is performed to the voltage doubler rectifier circuit, and when AC200V commercial AC power is input, for example, equal voltage by a bridge rectifier circuit is used. Switching is made to the (full wave) rectifier circuit. By switching in this way, a rectified and smoothed voltage of almost the same level can be obtained in the AC100V system and the AC200V system.

  Patent Document 1 discloses a rectifier circuit 100 shown in FIG. The rectifier circuit 100 includes a rectifier bridge DB formed by bridge-connecting diodes D101 to D104, capacitors C101 and C102 (first and second capacitors) connected in series between output terminals DO1 and DO2 of the rectifier bridge DB, For example, the switch SW101 and the input voltage detector 103 are provided between one of the input terminals DI1 and DI2 of the rectifier bridge DB, for example, between the input terminal DI2 and the connection point CN of the capacitors C101 and C102.

  The rectifier bridge DB is configured to rectify an AC voltage from the AC power supply 101 and output it from the output terminals DO1 and DO2 by connecting the AC power supply 101 to the input terminals P101 and P102. The capacitors C101 and C102 smooth the output from the rectifying bridge DB and supply it to the load 102.

  The input voltage detection unit 103 detects the level of the input voltage from the AC power supply 101 connected to the input terminals P101 and P102, and the detected input voltage is within a preset voltage range centered on 100V. In this case, a switch signal is output to turn on the switch SW101. Further, the switch SW101 is set to OFF in the initial state before the AC power supply 101 is connected to the input terminals P101 and P102.

  When the switch SW101 is turned on, the current from the AC power supply 101 returns to the input terminal P102 through the input terminal P101, the diode D102, the capacitor C101, and the switch SW101 in the half cycle in which the input terminal P101 side is positive. On the other hand, in the half cycle in which the input terminal P102 side is positive, the feedback is made to the input terminal P101 through the input terminal P102, the switch SW101, the capacitor C102, and the diode D101. Therefore, a rectified voltage of 100 V applied alternately to the capacitors C101 and C102 every half cycle is applied to the load 102 in series (double voltage rectification) and supplied to the load 102.

  When the switch SW101 is off, the current from the AC power supply 101 is fed back to the input terminal P102 through the input terminal P101, the diode D102, the capacitors C101 and C102, and the diode D103 in the half cycle in which the input terminal P101 side is positive. On the other hand, in the half cycle in which the input terminal P102 side is positive, the feedback is made to the input terminal P101 through the input terminal P102, the diode D104, the capacitors C101 and C102, and the diode D101. That is, the input voltage is full-wave rectified by the rectification bridge DB, smoothed by the capacitors C101 and C102, and supplied to the load 102.

  Further, the input voltage detection unit 103 waits for the output of the switching signal and turns off the switch SW101 until a preset time T1 elapses after the AC power supply 101 is connected to the input terminals P101 and P102. It is like that. This prevents the switch SW101 from being erroneously turned on by the input voltage detection unit 103 during the voltage rising period when the 200V AC power supply 101 is connected and being erroneously determined as the 100V system.

Note that the input voltage when the AC power supply 101 is a 200V system is outside the set voltage range centered on 100V.
The operation of the rectifier circuit 100 is as follows.

  First, when the AC power supply 101 is connected to the input terminals P101 and P102, the input voltage detection unit 103 determines whether or not a preset time T1 has elapsed, and waits until the time T1 has elapsed. When the time T1 elapses, it is determined whether or not the input voltage from the AC power supply 101 is within a preset voltage range centered on 100V.

  When the 200V AC power supply 101 is connected, the input voltage is outside the set voltage range centered on 100V, and the switch SW101 remains off. Therefore, the load 102 is supplied with a rectified voltage of 200 V that has been subjected to full-wave rectification by the rectification bridge DB and then smoothed by the series circuit of the capacitors C101 and C102.

  On the other hand, when the 100V AC power supply 101 is connected, the input voltage is within the set voltage range centering on 100V, and the switch SW101 is turned on. Accordingly, the load 102 is supplied with a rectified voltage of 200 V that has been double-voltage rectified.

  As described above, in this rectifier circuit 100, the level of the input voltage of the connected AC power supply 101 is detected, and the switch SW101 is automatically turned on / off according to this input voltage. It is assumed that the load 102 can be driven appropriately only by connection.

  In another conventional technique, for example, Patent Document 2 discloses a world-wide power supply device in which a switching element that switches between full-wave rectification and voltage doubler rectification modes is configured by a relay, and this device includes a pair of AC input terminals. If the AC voltage supplied to is low, the relay switch is turned on to operate in the double voltage mode, and if it is high, the relay switch is turned off to operate in the full-wave rectification mode. It has a circuit.

  In addition, the power supply circuit of Patent Document 3 includes a switch control circuit that operates a rectification switching switch that switches the rectifying means to full-wave rectification or voltage doubler rectification. Further, before the rectified voltage exceeds a set level, the switching circuit is In order to start full-wave rectification and start setting of the switching circuit after a lapse of a certain time from the time when the rectified voltage exceeds the set level, a delay circuit is provided that issues a switching command to the changeover switch.

  Furthermore, the switching power supply disclosed in Patent Document 4 discloses a configuration that reduces power consumption by completely shutting off the power supply to the control circuit of the switching power supply serving as the main power supply in the standby mode.

JP-A-6-54537 JP 2001-157452 A Japanese Patent Laid-Open No. 02-111262 JP 2006-94676 A

  However, in the power supply device including the rectifier circuit of Patent Document 1 described above, when an a-contact electromagnetic relay is used as the switch SW101 in the rectifier circuit 100, power of several hundreds mW is always required to turn on the switch SW101. To do. For this reason, in the case of AC100V system input, in the voltage doubler rectifier circuit mode, one or two switches are turned on even during standby, so that power consumption during standby when the load is not driven increases. There is.

  Furthermore, when the failure of the input voltage detection unit or the control unit of the switch SW101 occurs, if the switch SW101 malfunctions and turns on when the AC input voltage is high (for example, 200 V), the rectified voltage becomes an overvoltage, which is large to the load. There is a problem that a DC voltage is applied and the load is destroyed, resulting in a dangerous state.

  Further, the device of Patent Document 2 requires a relay drive circuit having a large number of circuit elements. In this case, the signal input to the relay drive circuit is only the output signal from the input voltage detector, and the standby release signal is output. It is impossible to reduce power consumption during standby. In addition, the device of Patent Document 3 includes a delay circuit in the output stage, but in this case, it only prevents unnecessary on / off operation of the relay at the time of starting, and malfunction of the relay when the input voltage is momentarily interrupted. Cannot be prevented.

  Further, Patent Document 4 shuts off the power supply to the control circuit of the switching power supply device serving as the main power supply in the standby mode by the standby signal from the outside, and acts to stop the switching operation of the main power supply. However, it is not configured to control the operation of the first switch of the rectifier circuit by a logical sum with other signals (signal of the input voltage detection unit or signal of the output voltage detection unit).

  The present invention has been made in view of the above-described problems of the prior art. A rectifier circuit that can reduce standby power consumption and prevent malfunction of a changeover switch while having a simple circuit configuration. An object of the present invention is to provide a low-cost power supply device that is excellent in safety.

In order to solve the above problems, a first embodiment of the present invention (see FIG. 1) includes a rectifier that converts an AC voltage of an AC power source into a DC voltage, and the rectifier is doubled from a full-wave rectifier mode during an on-operation. A first switch for switching to a voltage rectification mode; a first switch control means for controlling on / off operation of the first switch; and a voltage level of the AC power supply and detecting an output signal corresponding to the AC voltage level. An input voltage detection means for outputting to the first switch control means, wherein the AC voltage output from the AC power supply is converted into a DC voltage and supplied to the load,
The first switch control means turns on the first switch only when the input voltage level detected by the input voltage detection means is equal to or lower than the first upper limit value and a standby release signal is input from the outside. It is characterized by doing.

  According to this configuration, the operation of the first switch is safely turned on by controlling the operation of the first switch of the rectifier circuit by the logical sum of the input voltage level signal from the input voltage detection means and the standby release signal. In addition, power consumption during standby can be reduced.

In the above configuration, the rectifier includes a diode bridge circuit and at least two voltage dividing capacitors connected in series between the positive and negative output terminals of the diode bridge circuit, and the first switch includes the at least two capacitors. Between the intermediate point of the diode and the AC input terminal of the diode bridge circuit.
Further, the input voltage detecting means has a delay function.

  With the above configuration, the rectifying unit can have a simple circuit configuration, and by providing the input voltage detecting unit with a delay function, malfunction of the changeover switch can be prevented.

Also, according to the configuration related to the first embodiment (see FIG. 2), the first switch is an electromagnetic relay, and the first switch control means is an exciting coil for driving the first switch. A second switch connected in series to the exciting coil, a second switch control for controlling an on / off operation of the second switch by receiving an output signal of the input voltage detection means and the standby release signal. Means,
The second switch control means turns on the second switch only when the input voltage level detected by the input voltage detection means is equal to or lower than a first upper limit value and the standby release signal is input. The exciting coil turns on the first switch only when the second switch is turned on.

  Accordingly, since the first switch can be turned on / off only by the second switch, the rectifying means can have a simple circuit configuration, and the apparatus can be configured at low cost.

Further, according to the configuration related to the first embodiment (see FIG. 4), the first switch is an electromagnetic relay, and the first switch control means is an exciting coil for driving the first switch. And third and fourth switches connected in series to the exciting coil, third switch control means for receiving the standby release signal and controlling the on / off operation of the third switch, and the input voltage A fourth switch control unit that receives an output signal of the detection unit and controls an on / off operation of the fourth switch;
The third switch control means turns on the third switch when the standby release signal is input, and the fourth switch control means determines that the input voltage level detected by the input voltage detection means is a first upper limit. The fourth switch is turned on when the value is equal to or less than the value, and the exciting coil turns on the first switch only when both the third switch and the fourth switch are turned on.

  As a result, two switch control means are provided in the internal configuration of the first switch control means. If the fourth switch does not turn on even if the third switch fails in the short mode, the first switch does not turn on. Even if the fourth switch fails in the short mode, the first switch is not turned on unless the third switch is turned on, so that a safer power supply device can be realized.

Further, according to the second embodiment of the present invention (see FIG. 6), the rectifying means for converting the AC voltage of the AC power source into the DC voltage, and the rectifying means from the full-wave rectification mode to the voltage doubler rectification mode during the ON operation. A first switch for switching, a first switch control means for controlling on / off operation of the first switch, and a voltage level of the DC voltage outputted from the voltage control means including the rectifier means and the first switch. Output voltage detection means for outputting an output signal corresponding to the DC voltage level to the first switch control means, and converts the AC voltage output from the AC power supply into a DC voltage and supplies it to the load. In the device
The first switch control means turns on the first switch only when the output voltage level detected by the output voltage detection means is less than or equal to the second upper limit value and a standby release signal is input from the outside. It is characterized by doing.

  According to this configuration, the operation of the first switch can be safely turned on by controlling the operation of the first switch of the rectifier circuit by the logical sum of the output voltage level signal from the output voltage detection means and the standby release signal. In addition, power consumption during standby can be reduced.

Further, according to the configuration related to the second embodiment (see FIG. 7), the rectifying means includes at least two voltage dividing capacitors connected in series between the diode bridge circuit and the positive and negative output terminals of the diode bridge circuit. The first switch is connected between an intermediate point of the at least two capacitors and an AC input terminal of the diode bridge circuit, the first switch is an electromagnetic relay, and the first switch control means includes: An excitation coil for driving the first switch, a second switch connected in series to the excitation coil, an output signal of the output voltage detection means, and the standby release signal are input, and the second switch Second switch control means for controlling on / off operation,
The second switch control means turns on the second switch only when the output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value and the standby release signal is input. The exciting coil turns on the first switch only when the second switch is turned on.

  With the above configuration, since the first switch can be turned on / off only by the second switch, the rectifying means can have a simple circuit configuration, and the apparatus can be configured at low cost.

Further, according to the configuration related to the second embodiment (see FIG. 9), the rectifying means includes at least two voltage dividing capacitors connected in series between a diode bridge circuit and the positive and negative output terminals of the diode bridge circuit. The first switch is connected between an intermediate point of the at least two capacitors and an AC input terminal of the diode bridge circuit, the first switch is an electromagnetic relay, and the first switch control means includes: An excitation coil for driving the first switch, third and fourth switches connected in series to the excitation coil, and the standby release signal are input to control the on / off operation of the third switch. A fourth switch for controlling the on / off operation of the fourth switch by receiving the output signal of the third switch control means and the input detection means. And a pitch control unit,
The third switch control means turns on the third switch when the standby release signal is input, and the fourth switch control means determines that the output voltage level detected by the output voltage detection means is a second upper limit. The fourth switch is turned on when the value is equal to or less than the value, and the exciting coil turns on the first switch only when both the third switch and the fourth switch are turned on.

  Thereby, two switch control means are provided in the internal configuration of the first switch control means, and the third switch is in the short mode by separating the signal from the output voltage detection unit and the standby release signal into two systems. If the fourth switch is not turned on even if a failure occurs, the first switch will not turn on. Conversely, even if the fourth switch fails in the short mode, the first switch will not turn on unless the third switch is turned on. A safe power supply can be realized.

  When the output voltage is detected as shown in FIGS. 6, 7, and 9, the detected voltage in the double voltage rectification mode is twice the value in the full wave rectification mode, and the output voltage is equal to or lower than the second upper limit value. Is detected and the detection voltage doubles at this moment, and if this detection voltage exceeds the second upper limit value, it returns to the full-wave rectification mode, and then repeats both rectification modes. However, this malfunction can be prevented by providing a hysteresis characteristic for detection as in the fourth embodiment described later.

Further, according to the third embodiment of the present invention (see FIG. 11), the rectifying means for converting the AC voltage of the AC power source into the DC voltage, and the rectifying means is changed from the full-wave rectification mode to the double voltage rectification mode during the on-operation. A first switch for switching, a first switch control means for controlling on / off operation of the first switch, a voltage level of the AC power supply, and an output signal corresponding to the AC voltage level is detected by the first switch control. The voltage level of the DC voltage output from the voltage control means including the rectifying means and the first switch is detected, and an output signal corresponding to the DC voltage level is output to the first voltage detection means for outputting to the means. Output voltage detection means for outputting to the switch control means, in the power supply device that converts the AC voltage output from the AC power supply into a DC voltage to supply to the load,
The first switch control means has an input voltage level detected by the input voltage detection means that is equal to or lower than a first upper limit value, and an output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value. In addition, the first switch is turned on only when a standby release signal is input from the outside.

  According to this configuration, the operation of the first switch of the rectifier circuit is controlled by the logical sum of the input voltage level signal from the input voltage detection means, the output voltage level signal from the output voltage detection means, and the standby release signal. By doing so, the operation of the first switch can be turned on more safely, and the power consumption during standby can be reduced.

Also, according to the configuration related to the second embodiment (see FIG. 12), the rectifying means includes at least two voltage dividing capacitors connected in series between the diode bridge circuit and the positive and negative output terminals of the diode bridge circuit. The first switch is connected between an intermediate point of the at least two capacitors and an AC input terminal of the diode bridge circuit, the first switch is an electromagnetic relay, and the first switch control means includes: An excitation coil for driving the first switch, a second switch connected in series to the excitation coil, each output signal of the input voltage detection means and the output voltage detection means, and the standby release signal are input. And second switch control means for controlling on / off operation of the second switch,
The second switch control means has an input voltage level detected by the input voltage detection means that is equal to or lower than a first upper limit value, and an output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value. And the second switch is turned on only when the standby release signal is input, and the exciting coil turns on the first switch only when the second switch is turned on. And

  With the above configuration, since the first switch can be turned on and off with one second switch, the rectifying means can have a simple circuit configuration, and the apparatus can be configured at low cost.

Further, according to the configuration related to the third embodiment (see FIG. 14), the rectifying means includes at least two voltage dividing capacitors connected in series between the diode bridge circuit and the positive and negative output terminals of the diode bridge circuit. The first switch is connected between an intermediate point of the at least two capacitors and an AC input terminal of the diode bridge circuit, the first switch is an electromagnetic relay, and the first switch control means includes: An excitation coil for driving the first switch, third and fourth switches connected in series to the excitation coil, and the standby release signal are input to control the on / off operation of the third switch. The third switch control means, and the output signals of the input voltage detection means and the output voltage detection means are inputted, and the fourth switch is turned on. / A fourth switch control means for controlling the off operation,
The third switch control means turns on the third switch when the standby release signal is input, and the fourth switch control means determines that the input voltage level detected by the input voltage detection means is a first upper limit. The fourth switch is turned on only when the output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value, and the exciting coil is connected to the third switch and the fourth switch. The first switch is turned on only when both are turned on.

  As a result, two switch control means are provided in the internal configuration of the first switch control means, and each of the signals from the input voltage detection means and the output voltage detection means and the standby release signal are separated into two systems. Since the first switch is turned on and off by the logical sum of the switches, even if the third switch fails in the short mode, if the fourth switch does not turn on, the first switch does not turn on. Conversely, the fourth switch does not turn on. If the third switch is not turned on even if it fails, the first switch is not turned on, so that a safer power supply device can be realized.

  According to the configuration of the fourth embodiment related to the first embodiment (see FIG. 16), the second switch control means includes a hysteresis circuit having a first upper limit value and a first lower limit value, When the input voltage level detected by the input voltage detection means exceeds the first upper limit value or when the standby release signal is not input, the second switch is turned off, and the excitation coil is The first switch is turned off when the second switch is off.

  When the input voltage level detected by the input voltage detection means exceeds the first upper limit value and the first switch is turned off, the hysteresis circuit maintains an off state unless the voltage level becomes equal to or lower than the first lower limit value. On the other hand, when the input voltage level detected by the input voltage detection means becomes equal to or lower than the first lower limit value and the first switch is turned on, the on state is maintained unless the input voltage level exceeds the first upper limit value. .

  According to this configuration, the on / off state of the first switch is maintained on the basis of the input voltage level signal from the input voltage detection means by the hysteresis circuit, so that the on / off operation of the first switch can be repeated unnecessarily. The operation of the rectifier circuit can be stabilized.

  In relation to the configuration of the third embodiment (see FIG. 14), the third switch control means is configured such that the output voltage level detected when the standby release signal is not input or when the output voltage detection means is the first. In any case when the upper limit value is exceeded, the third switch is turned off, and the fourth switch control means is configured such that the input voltage level detected by the input voltage detection means exceeds the first upper limit value, or In any case where the output voltage level detected by the output voltage detecting means exceeds the second upper limit value, the fourth switch is turned off, and the exciting coil is one of the third switch and the fourth switch. The first switch is turned off when is turned off.

  Thus, when either the third switch or the fourth switch is in the off state, the first switch is in the off state, so that a double malfunction prevention function can be achieved.

  The output voltage detection means outputs an output signal to one or both of the third switch control means and the fourth switch control means, and the third switch control means or the fourth switch control means When the output voltage level detected by the output voltage detection means exceeds the second upper limit value, the third switch or the fourth switch is turned off, respectively.

  According to the above configuration, the third switch is turned off based on the standby release signal or the signal from the output voltage detecting means, and the fourth switch is turned off based on the signal from the input voltage detecting means or the signal from the output voltage detecting means. Then, the first switch can be turned off by the off operation of any of the third and fourth switches.

  According to another configuration, the first upper limit value and the first lower limit value or / and the second upper limit value and the second lower limit value are included, and / or between the first upper limit value and the first lower limit value. Between 2 upper limit value and 2nd lower limit value, it sets so that it may have a hysteresis characteristic.

  Further, in the configuration related to the first embodiment, the input voltage detection unit has a delay function, and even if the input voltage level detected by the input voltage detection unit becomes equal to or lower than the first upper limit value, the predetermined time is exceeded. An output signal corresponding to the detected input voltage level is not output to the first switch control means until the time has elapsed.

  This delay function can prevent the relay from malfunctioning when the input voltage is momentarily interrupted, and the output voltage of the rectifier circuit is not overvoltage. Further, it is possible to prevent unnecessary on / off operation of the relay at all times as well as at the time of starting.

  The first switch control means has an insulating circuit for insulating between the input standby release signal and the internal circuit of the first switch control means. The insulation circuit is composed of a photocoupler or a transformer.

In the first, second, third, and fourth embodiments, the first switch may be a semiconductor element. By using a semiconductor element, power consumption can be further suppressed.
In the first, second, third, and fourth embodiments, a power-on signal for driving a load is used as the standby release signal.

  Since the present invention is configured as described above, the rectifier circuit capable of reducing power consumption during standby and preventing malfunction of the changeover switch while having a simple circuit configuration, and a low cost using the rectifier circuit. A power supply device with excellent safety can be provided.

In addition, since the first switch is turned on by the logical sum of the output signal from one or both of the input voltage detection means and the output voltage detection means and the standby release signal, even when the input voltage is 100V system during standby, The power consumption can be suppressed without operating one switch.
Further, in order to turn on the first switch more safely, the first switch control means is divided into two systems and is constituted by the logical sum of the two switches, thereby performing a safe and reliable switch switching operation. be able to.

It is a circuit diagram which shows the basic composition of the power supply device of 1st Embodiment which concerns on this invention. It is a circuit diagram which shows the internal structure of the 1st switch in 1st Embodiment of this invention. FIG. 3 is a circuit diagram showing a detailed circuit configuration of FIG. 2 in the first embodiment of the present invention. It is a circuit diagram which shows the modification of the internal structure of the 1st switch in 1st Embodiment of this invention. FIG. 5 is a circuit diagram showing a detailed circuit configuration of FIG. 4 in the first embodiment of the present invention. It is a circuit diagram which shows the basic composition of the power supply device of 2nd Embodiment which concerns on this invention. It is a circuit diagram which shows the internal structure of the 1st switch in 2nd Embodiment of this invention. It is a circuit diagram which shows the detailed circuit structure of FIG. 7 in 2nd Embodiment of this invention. It is a circuit diagram which shows the modification of the internal structure of the 1st switch in 2nd Embodiment of this invention. FIG. 10 is a circuit diagram showing a detailed circuit configuration of FIG. 9 in the first embodiment of the present invention. It is a circuit diagram which shows the basic composition of the power supply device of 3rd Embodiment which concerns on this invention. It is a circuit diagram which shows the internal structure of the 1st switch in 3rd Embodiment of this invention. It is a circuit diagram which shows the detailed circuit structure of FIG. 12 in 3rd Embodiment of this invention. It is a circuit diagram which shows the modification of the internal structure of the 1st switch in 3rd Embodiment of this invention. It is a circuit diagram which shows the detailed circuit structure of FIG. 14 in 1st Embodiment of this invention. It is a detailed circuit diagram which shows the modification of embodiment shown in FIG. 3 of this invention. FIG. 6 is a waveform diagram showing voltage characteristics and on / off operation of a first switch when a hysteresis circuit is not included in a conventional power supply device. It is a wave form diagram which shows the voltage characteristic which shows operation | movement of embodiment of this invention, and the on-off operation of a 1st switch. It is a wave form diagram which shows the voltage characteristic which shows the other operation | movement of embodiment of this invention, and the on-off operation of a 1st switch. It is a wave form diagram which shows the voltage characteristic in case an input voltage detection part is not provided with a delay function, and ON / OFF operation | movement of a 1st switch. It is a wave form diagram which shows the voltage characteristic in case an input voltage detection part is not provided with a delay function, and ON / OFF operation | movement of a 1st switch. It is a circuit diagram which shows the structure of the power supply device of a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a circuit diagram showing a basic configuration of a power supply device according to a first embodiment of the present invention.

In FIG. 1, a power supply device 10 converts an AC voltage supplied from an AC power supply Vac into a DC voltage and supplies it to a load 4. A rectifier circuit (including a diode bridge circuit DB and two capacitors C1 and C2) Rectifier), a first switch SW1 for switching the rectifier circuit between the full-wave rectifier mode and the voltage doubler rectifier mode, and a first switch controller (first switch controller) CT1 for controlling on / off operation of the first switch SW1. With.
The rectifier circuit and the first switch control unit CT1 constitute a voltage control circuit that converts an AC voltage output from the AC power supply Vac into a DC voltage.

  In addition to the above configuration, the power supply device 10 according to the present embodiment is connected to the input terminals T1 and T2, detects the voltage level of the AC power supply Vac, and performs first switch control on the output signal corresponding to the detected voltage level. An input voltage detection unit (input voltage detection means) 2 for outputting to the unit CT1 is provided, and a standby release signal 3 from the outside is further input to the first switch control unit CT1.

  The diode bridge circuit DB is formed by bridge-connecting diodes D1 to D4, and voltage dividing capacitors C1 and C2 (first and second capacitors) are connected in series between output terminals C and D of the diode bridge circuit DB. A switch SW1 composed of an electromagnetic relay is connected between one input terminal B of the diode bridge circuit DB and a connection point between the voltage dividing capacitors C1 and C2.

  In the power supply device 10, the AC power supply Vac is connected to the input terminals T1 and T2, so that the diode bridge circuit DB rectifies the AC voltage from the AC power supply Vac applied to the input terminals A and B and outputs the output terminals C and A DC voltage is output from D. The voltage dividing capacitors C1 and C2 smooth the output from the diode bridge circuit DB and supply it to the load 4.

The first switch control unit CT1 is input with a DC power source Vin for driving the switch control unit, which can be supplied from an auxiliary winding of a DC / DC converter constituting the load 4, for example. it can.
In the power supply device 10 according to the present embodiment, a power-on signal for switching the load 4 from the standby state to the operating state (starting driving) is used as the standby release signal 3 from the outside.

  Next, using Table 1, the operation of the first switch control unit CT1 that is a characteristic part of the power supply device 10 according to the present embodiment will be described.

Table 1 is a table for explaining the operation logic of the first switch SW1 in the power supply device 10.
In this table, when the first upper limit value Vac1 detected by the input voltage detection unit 2 is equal to or less than that value, the input voltage detection unit 2 turns on the first switch SW1 to the first switch control unit CT1. The first upper limit value of the voltage level at which the output signal is output.

  In Table 1, when the voltage level of the AC voltage detected by the input voltage detection unit 2 exceeds the first voltage value Vac1, the first switch control unit CT1 sets the first switch SW1 to the first switch SW1 regardless of the presence / absence of the standby release signal 3. The output signal is not output, the first switch SW1 remains off, and the rectifier circuit is in the full-wave rectification mode.

  Further, even when the voltage level of the AC voltage detected by the input voltage detector 2 is equal to or lower than the predetermined first voltage value Vac1, when the standby release signal 3 is not input to the first switch controller CT1, The first switch controller CT1 does not output a signal to the first switch SW1, the first switch SW1 remains off, and the rectifier circuit is in the full-wave rectification mode.

  Next, the voltage level of the AC voltage detected by the input voltage detection unit 2 is equal to or lower than a predetermined first voltage value (first upper limit value) Vac1, and a standby release signal is input to the first switch control unit CT1. The first switch controller CT1 outputs a signal to the first switch SW1, the first switch SW1 is turned on, and the rectifier circuit is switched to the voltage doubler rectification mode.

  Thus, when the load 4 is in the standby state (the power-on signal is off), the first switch control unit CT1 is independent of the magnitude of the input voltage detected by the input voltage detection unit 2. Since the standby release signal 3 is not input, the first switch SW1 is kept off. Then, the load 4 starts driving (the power-on signal is turned on), the standby release signal 3 is input to the first switch control unit CT1, and the voltage level of the AC power source detected by the input voltage detection unit 2 is predetermined. The first switch control unit CT1 switches the first switch SW1 to the ON state only when the first voltage value Vac1 is equal to or lower than the first voltage value Vac1.

  That is, in the power supply device 10, even if the voltage level detected by the input voltage detection unit 2 is equal to or lower than the predetermined first upper limit value Vac1, the first switch SW1 is turned on if the load 4 is in the standby state. Therefore, the power for driving the first switch SW1 is reduced, and the standby power consumption can be reduced.

  FIG. 2 is a diagram more specifically showing the circuit configuration of the power supply device 10a including the first switch control unit CT1a based on the circuit configuration diagram of FIG. 1, and FIG. 3 is a more detailed circuit of the power supply device 10a. It is the figure which showed the structure.

  As shown in FIG. 2, the first switch control unit CT1a includes an exciting coil L1 that enables the on / off operation of the first switch SW1 that is an electromagnetic relay, and a first switch connected in series to one end of the exciting coil L1. 2 switch SW2 and 2nd switch control part (2nd switch control means) CT2 which enables ON / OFF operation | movement of 2nd switch SW2. The output signal of the input voltage detector (input voltage detector) 2 and the standby release signal are input to the second switch controller, and the other end of the exciting coil L1 is connected to GND.

  As shown in FIG. 3, in the first switch control unit CT1a, the second switch SW2 includes a transistor Q1 and resistors R1 and R2, and the second switch control unit CT2 includes a photocoupler PQ1 and a photocoupler drive. A circuit DP1, an FET Q2 to which a resistor R3 and a capacitor C3 are connected, and an FET Q3 to which resistors R4 and R5 and a capacitor C4 are connected are provided.

The DC power source Vin includes a coil L2, a diode D7, and a capacitor C6, and is connected to the second switch SW2. The standby release signal 3 is connected to the photocoupler drive circuit DP1. The photocoupler PQ1 serves as an insulating circuit that insulates between the second switch control unit CT2 and the standby release signal 3.
The input voltage detection unit 2 includes a diode D5, resistors R6 and R7, a capacitor C5, and a Zener diode ZD1.

Next, the operation of the first switch control unit CT1 of the power supply device 10a will be described using Table 2.

Table 2 is a table for explaining the operation logic of the first switch SW1 in the power supply device 10a of FIG.

  In Table 2, when the voltage level of the AC voltage detected by the input voltage detection unit 2 exceeds the predetermined first voltage value Vac1, the second switch control unit CT2 sets the second switch regardless of the presence or absence of the standby release signal 3. The switch SW2 is turned off, and no current flows through the exciting coil L1. Therefore, the first switch control unit CT1 turns off the first switch SW1, and the rectifier circuit is in the full-wave rectification mode.

  Further, when the voltage level of the AC voltage detected by the input voltage detection unit 2 is equal to or lower than the predetermined first voltage value Vac1 and the standby release signal 3 is not input to the first switch control unit CT1, the same as above. The second switch controller CT2 turns off the second switch SW2, and no current flows through the exciting coil L1. For this reason, the first switch controller CT1 does not output an output signal to the first switch SW1, the first switch SW1 remains off, and the rectifier circuit is in the full-wave rectification mode.

  Next, when the voltage level of the AC voltage detected by the input voltage detection unit 2 is equal to or lower than a predetermined first voltage value Vac1 and the standby release signal 3 is input to the first switch control unit CT1, the second switch The controller CT2 turns on the second switch SW2, and a current flows through the exciting coil L1. Therefore, the first switch control unit CT1 turns on the first switch SW1, and the rectifier circuit is switched to the voltage doubler rectification mode.

  As described above, when the load 4 is in the standby state (the power-on signal is OFF), the second switch control unit CT2 waits regardless of the magnitude of the input voltage detected by the input voltage detection unit 2. Since the release signal 3 is not input, the second switch SW2 is turned off, and the first switch controller CT1 maintains the first switch SW1 in the off state.

  Then, the load 4 starts driving (the power-on signal is turned on), the standby release signal 3 is input to the second switch control unit CT2, and the voltage level of the AC power supply detected by the input voltage detection unit 2 is Only when the voltage value is equal to or lower than the predetermined first voltage value Vac1, the second switch control unit CT2 turns on the second switch SW2, and as a result, the first switch control unit CT1 switches the first switch SW1 to the on state.

  That is, in the power supply device 10a, even if the voltage level detected by the input voltage detection unit 2 is equal to or lower than the predetermined upper limit value Vac1, if the load 4 is in the standby state, the second switch SW2, and thus the first Since one switch 1 is not turned on, the power for driving the first switch SW1 is reduced, and the power consumption during standby can be reduced.

  As described above, the power supply device 10a in the present embodiment provides a rectifier circuit capable of reducing standby power consumption while having a simple circuit configuration, and a low-cost power supply device using the rectifier circuit. It becomes possible.

Next, a modification of the present invention according to FIGS. 4 and 5 related to the first embodiment of the present invention shown in FIG. 1 will be described.
FIG. 4 is a diagram showing a circuit configuration of a power supply apparatus 10b showing a modification of the first switch control means of the present invention, and FIG. 5 is a diagram showing a more detailed circuit configuration of the power supply apparatus 10b.

  In FIG. 4, the first switch controller CT1b includes a third switch SW3 and a fourth switch SW4 connected in series to both ends of the exciting coil L1, and a third switch control for controlling the on / off operation of each switch. Section (third switch control means) CT3 and fourth switch control section (fourth switch control means) CT4. The standby release signal 3 input to the third switch control section CT3 and the fourth switch control section CT4 An input voltage detection unit 2 is provided. One end of the fourth switch SW4 is connected to GND.

Note that the third and fourth switches SW3 and SW4 are not necessarily arranged at both ends of the exciting coil L1, and may be arranged in series on one side of the exciting coil L1.
More specifically, in the first switch control unit CT1b shown in FIG. 5, the third switch SW3 includes a transistor Q1 and resistors R1 and R2, and the third switch control unit CT3 includes a photocoupler PQ1 and a photocoupler. And a drive circuit DP1.
Further, the fourth switch SW4 includes an FET Q4, a resistor R8, and a capacitor C7, and the fourth switch control unit CT4 includes an FET Q3 to which the resistors R4 and R9 and the capacitor C4 are connected.

  The DC power source Vin includes a coil L2, a diode D7, and a capacitor C6, and is connected to the third switch SW3. The standby release signal 3 is connected to the photocoupler drive circuit DP1. The input voltage detection unit 2 includes diodes D5 and D6, resistors R6 and R7, a capacitor C5, and a Zener diode ZD1.

  In the configuration of the above-described embodiment, only the input voltage detection unit 2 is provided as the voltage detection means, and the switch and the switch control unit for passing a current through the excitation coil L1 that controls the on / off operation of the first switch SW1 are as follows. It is separated into two systems.

  As a result, the third switch control unit CT3 turns on the third switch SW3 only when the standby release signal 3 is input, and the fourth switch control unit CT4 detects the voltage detected by the input voltage detection unit 2. The fourth switch SW4 is turned on only when the level is equal to or lower than the predetermined first upper limit value, and the exciting coil L1 is only in the first state when both the third switch SW3 and the fourth switch SW4 are turned on. Switch SW1 is turned on.

  Accordingly, as in the basic configuration of FIG. 1, the operation of the first switch of the rectifier circuit can be controlled by the logical sum of the signal of the input voltage detection unit 2 and the standby release signal 3, and power consumption during standby can be reduced. The first switch control means can be separated into two systems, and the first switch SW1 can be safely turned on by the logical sum of the two switches to prevent malfunction.

(Second Embodiment)
Next, a power supply device according to a second embodiment of the present invention will be described.
FIG. 6 is a circuit diagram showing the basic configuration of the second embodiment of the present invention, and the circuit configuration diagrams related to this are shown in FIGS.

Compared with the power supply device 10 of FIG. 1, the power supply device 20 of FIG. 6 uses an output voltage detection unit (output voltage detection means) 5 instead of the input voltage detection unit 2, and includes a first switch control unit CT1. The standby release signal 3 and the output signal from the output voltage detector 5 are input.
The first switch control unit CT1 of the power supply device 20 is the first switch only when the output voltage level detected by the output voltage detection unit 5 is less than or equal to the second upper limit value and the standby release signal 3 is input from the outside. The switch SW1 is turned on.

7, the internal configuration of the first switch control unit CT1 shown in FIG. 6 is a circuit configuration corresponding to FIG. 2, and includes a second switch SW2 and a second switch control unit CT2.
The output voltage detection unit 5 shown in FIG. 8 includes a resistor R10 and a Zener diode ZD2, and this detection unit detects a DC voltage, and therefore has a circuit configuration that is greater than that of the input voltage detection unit 2 as compared with the first embodiment. Can be simplified.

  According to the circuit configuration of the second embodiment (FIG. 8), the second switch control unit CT2 includes only the output voltage detection unit 5 as voltage detection means, and the output voltage detected by the output voltage detection unit 5 The second switch SW2 is turned on only when the level is equal to or lower than the second upper limit value and the standby release signal 3 is input, and the exciting coil L1 is turned on only when the second switch SW2 is turned on. The switch SW1 can be turned on.

Next, the circuit of FIGS. 9 and 10 having a circuit configuration as a modification of the first switch control means in the basic configuration of FIG. 6 will be described.
FIG. 9 shows a power supply device 20b related to the second embodiment similar to the power supply device 20a of FIG. 7, and FIG. 10 shows a detailed circuit configuration diagram corresponding to FIG.

  In the circuit configuration of FIG. 9, the output signal of the output voltage detector 5 and the standby release signal 3 are input to the first switch controller CT1b. The first switch control unit CT1b includes a third switch SW3 and a fourth switch SW4 connected in series to both ends of the exciting coil L1, a third switch control unit CT3 for controlling the on / off operation of each switch, A four-switch control unit CT4, a standby release signal 3 input to the third switch control unit CT3, and an output voltage detection unit 5 input to the fourth switch control unit CT4. As a result, in the configuration related to the second embodiment of the present invention shown in FIG. 9, the output voltage detection unit 5 is provided instead of the input voltage detection unit 2 as compared with FIG. 4 of the first embodiment. Yes.

  The third switch control unit CT3 turns on the third switch SW3 when the standby release signal 3 is input, and the fourth switch control unit CT4 detects that the output voltage level detected by the output voltage detection unit 5 is the second upper limit. When the value is equal to or less than the value, the fourth switch SW4 is turned on, and the exciting coil L1 turns on the first switch SW1 only when both the third switch SW3 and the fourth switch SW4 are turned on.

  As a result, the operation of the first switch of the rectifier circuit can be controlled by the logical sum of the signal of the output voltage detection unit and the standby release signal, so that the power consumption during standby can be reduced. The system can be separated into a system and the first switch can be safely turned on by the logical sum of the two switches to prevent malfunction.

  FIG. 10 shows a circuit configuration having the first switch control unit CT1b shown in FIG. 5, and includes an output voltage detection unit 5 instead of the input voltage detection unit 2 as compared with the first embodiment described above. is there. The output voltage detection unit 5 includes a resistor R10 and a Zener diode ZD2, and detects a DC voltage. Therefore, the circuit configuration can be simplified as compared with the input voltage detection unit 2.

(Third embodiment)
Next, a third embodiment according to the present invention will be described.
FIG. 11 is a circuit diagram showing a basic configuration of the third embodiment of the present invention. In FIG. 1, the circuit configuration includes an output voltage detection unit 5 in addition to the input voltage detection unit 2.

  In FIG. 11, the power supply device 30 is configured to input the output signal of the input voltage detection unit 2, the output signal of the output voltage detection unit 5, and the standby release signal 3 to the first switch control unit CT1. In the first switch control unit CT1, the input voltage level detected by the input voltage detection unit 2 is less than or equal to the first upper limit value, and the output voltage level detected by the output voltage detection unit 5 is less than or equal to the second upper limit value. Only when the standby release signal 3 is input from the outside, the first switch SW1 is turned on (see Table 3 for the operation logic of the first switch SW1).

  12 and 13 are detailed circuit diagrams of the first switch control unit CT1 shown in FIG. The first switch control unit CT1 in FIG. 12 includes a second switch SW2 and a second switch control unit CT2 as its internal configuration. And in this circuit structure, in addition to the input voltage detection part 2, the output voltage detection part 5 is provided compared with 1st Embodiment.

Table 3 is a table for explaining the operation logic of the first switch SW1 in the power supply device 30a of FIG.

In FIG. 12, the second switch control unit CT2 has an input voltage level detected by the input voltage detection unit 2 that is equal to or lower than a first upper limit value, and an output voltage level detected by the output voltage detection unit 5 is a second upper limit value. The second switch SW2 is turned on only when the standby release signal 3 is input from the outside, and the excitation coil L1 turns on the first switch SW1 only when the second switch SW2 is turned on. To do.
In the third embodiment (FIGS. 11, 12, and 13), even if the input voltage detection unit 2 fails, the first switch SW1 can be reliably controlled to prevent an overvoltage of the output voltage. The rectification mode switching control excellent in performance can be achieved.

  Next, FIG. 14 and FIG. 15 are shown as modified examples of the first switch control means related to the third embodiment shown in FIG. The configuration of the first switch control means corresponds to FIGS. 4 and 5 and FIGS.

  14 shows a configuration including an output voltage detection unit in addition to the input voltage detection unit, as compared with the second embodiment of FIG. 4, and FIG. 15 shows a detailed circuit configuration thereof.

  The power supply device 30b inputs the output signal of the input voltage detection unit 2, the output signal of the output voltage detection unit 5, and the standby release signal 3 to the first switch control unit CT1b. The first switch control unit CT1b includes a third switch SW3 and a fourth switch SW4 connected in series to both ends of the exciting coil L1, a third switch control unit CT3 for controlling the on / off operation of each switch, A 4-switch control unit CT4, a standby release signal 3 input to the third switch control unit CT3, and an input voltage detection unit 2 and an output voltage detection unit 5 input to the fourth switch control unit CT4. .

  As a result, the power supply device 30b includes the output voltage detection unit 5 in addition to the input voltage detection unit 2 as compared with the first embodiment. Therefore, in addition to the effects of the first embodiment, the input voltage detection Even if the unit 2 breaks down, the first switch SW1 can be reliably controlled, so that switching control of the rectification mode excellent in safety is possible.

  The output signal of the output voltage detection unit 5 may be input to both the third switch control unit CT3 and the fourth switch control unit CT4. With this configuration, safety can be further improved.

(Fourth embodiment)
Next, in FIG. 16, a modified example related to the first embodiment shown in FIG. 3 of the present invention will be described.
Compared with the first embodiment, the power supply device 10c of the fourth embodiment shown in FIG. 16 includes a hysteresis circuit 6 as a component of the second switch control unit CT2a in the first switch control unit CT1c. In addition to the upper limit value, it has a first lower limit value.

  The hysteresis circuit 6 has two thresholds for the input signal, and outputs a logic L potential when the potential of the input signal exceeds a high threshold, and conversely when the potential of the input signal falls below a low threshold. Output a logic high potential. When the input signal is between the low threshold value and the high threshold value, the previous output potential is held. Here, the voltage level detected by the input voltage detection unit 2 once exceeds the first upper limit value Vac1. When the first switch SW1 is turned off, the off state is maintained unless the voltage level becomes lower than the first lower limit value Vac2. Conversely, once the voltage level detected by the input voltage detection unit 2 is lower than the first lower limit value Vac2 and the first switch SW1 is turned on, the ON state is maintained as long as the voltage level does not exceed the first upper limit value Vac1. maintain.

  In FIG. 16, the second switch control unit CT2a is either when the input voltage level detected by the input voltage detection unit 2 exceeds the first upper limit value or when the standby release signal 3 is not input. The second switch SW2 is turned off, and the exciting coil L1 turns off the first switch SW1 when the second switch SW2 is off.

  In FIG. 16, the second switch control unit CT2a is either when the input voltage level detected by the input voltage detection unit 2 exceeds the first upper limit value or when the standby release signal 3 is not input. The second switch SW2 is turned off, and the exciting coil L1 turns off the first switch SW1 when the second switch SW2 is off.

  As a result, the hysteresis circuit 6 having the first upper limit value and the first lower limit value is provided, and the first voltage level signal from the input voltage detection unit 2 or the standby release signal 3 is used to operate the second switch SW2 through the operation of the second switch SW2. Since the OFF state of one switch SW1 is maintained, the ON / OFF operation of the first switch SW1 is not unnecessarily repeated, and the operation of the rectifier circuit can be stabilized.

  FIG. 17 is a diagram illustrating the voltage characteristics and the on / off operation of the first switch SW1 when the hysteresis circuit 6 is not provided as in a power supply device other than the present embodiment, and the voltage detected by the input voltage detection unit 2 When the level is slightly lower than the first upper limit value Vac1, the first switch SW1 is turned on.

  FIG. 18 is an example of operation when the hysteresis circuit 6 is provided in the present embodiment. The voltage level detected by the input voltage detector 2 exceeds the first upper limit value Vac1, and the first switch SW1 is turned off. Then, the OFF state is maintained unless the voltage level becomes lower than the first lower limit value Vac2.

  FIG. 19 shows another example of the operation of the present embodiment. Once the voltage level detected by the input voltage detector 2 is lower than the first lower limit value Vac2 and the first switch SW1 is turned on, the voltage level is changed to the first level. As long as the upper limit value Vac1 is not exceeded, the ON state is maintained.

  As a result, when the threshold value (predetermined voltage value) is one (only the upper limit value), the detected voltage level is a value in the vicinity of the threshold value (including the case where a ripple component is superimposed on the detected waveform). ) Since the first switch SW1 repeats the on / off operation, the operation of the rectifier circuit becomes unstable.

As in the fourth embodiment, the hysteresis circuit 6 is provided, and a width is provided between the upper limit value Vac1 and the lower limit value Vac2 using two threshold values (a predetermined upper limit value Vac1 and a predetermined lower limit value Vac2) ( Since the first switch SW1 does not repeat the on / off operation unnecessarily, the operation of the rectifier circuit is stabilized.
The same effect can be obtained when the hysteresis circuit 6 is applied to the output voltage detection unit 5 and the second lower limit value Vdc2 is added in addition to the second upper limit value Vdc1. That is, even in the circuit configurations of FIGS. 6, 7, 8, 9, and 10, the output voltage detector can be provided with hysteresis characteristics to prevent malfunctions in which the first switch is repeatedly turned on and off. .

  The representative embodiments of the present invention have been described above. However, the present invention is not limited to the circuit configurations of the above embodiments, and various modifications can be made without departing from the spirit of the present invention. is there.

  For example, even if the input voltage detection unit 2 has a delay function and the voltage level detected by the input voltage detection unit 2 is equal to or lower than the first upper limit value, the voltage is applied to the first switch control means until a predetermined time elapses. The output signal corresponding to the level may not be sent. This can be designed by adjusting the value of the capacitor C5 constituting the input voltage detector 2 to a relatively large value.

  As shown in FIG. 20, when the input voltage detection unit 2 does not have a delay function, (a) when the input voltage is momentarily interrupted, (b) the detection voltage of the input voltage detection unit 2 becomes the first upper limit value Vac1 or less. (C) The first switch SW1 is turned on, and (d) the output voltage of the rectifier circuit becomes an overvoltage.

On the other hand, as shown in FIG. 21, when the input voltage detector 2 has a delay function,
(a) When the input voltage is momentarily interrupted, (b) the detection voltage of the input voltage detector 2 does not become the first upper limit value Vac1 or less, (c) the first switch SW1 continues to be turned off, (d) There is an effect that the output voltage of the rectifier circuit does not become an overvoltage.

  In the present embodiment, the standby release signal 3 from the outside is a power-on signal for switching the load 4 from the standby state to the operating state (starting driving), but is not limited to this. An independent standby release signal prepared separately from the power-on signal may be used.

In the present embodiment, the first switch SW1 is an electromagnetic relay, but a semiconductor element such as a triac may be used. By using a semiconductor element, power consumption during standby can be further reduced.
In the second and third switch control units, the insulating circuit is configured by a photocoupler, but a transformer may be used instead of the photocoupler. Furthermore, it is not always necessary to use an insulating circuit.

  Further, although the switching element Q1 is a transistor and Q2 to Q4 are FETs, other switching elements (for example, transistors, FETs, IGBTs) can be substituted for each other.

2 Input voltage detection unit 3 Standby release signal 4 Load 5 Output voltage detection unit 6 Hysteresis circuit 10, 20, 30 Power supply device DB Diode bridge circuit C1, C2 Capacitor SW1 1st switch SW2 2nd switch SW3 3rd switch SW4 4th switch CT1, CT1a, CT1b, CT1c 1st switch control part CT2 2nd switch control part CT3 3rd switch control part CT4 4th switch control part

Claims (18)

Rectifying means for converting the AC voltage of the AC power source into a DC voltage;
A first switch for switching the rectifying means from a full-wave rectification mode to a voltage doubler rectification mode during an ON operation;
First switch control means for controlling on / off operation of the first switch;
Input voltage detection means for detecting the voltage level of the AC power supply and outputting an output signal corresponding to the AC voltage level to the first switch control means,
In the power supply device that converts the alternating voltage output from the alternating current power source into a direct current voltage and supplies the load to the load,
The first switch control means turns on the first switch only when the input voltage level detected by the input voltage detection means is equal to or lower than the first upper limit value and a standby release signal is input from the outside. A power supply device characterized by that.   The rectifying means includes a diode bridge circuit and at least two voltage dividing capacitors connected in series between positive and negative output terminals of the diode bridge circuit, and the first switch includes an intermediate point between the at least two capacitors and the diode. The power supply apparatus according to claim 1, wherein the power supply apparatus is connected between AC input terminals of the bridge circuit. The first switch is an electromagnetic relay;
The first switch control means includes an excitation coil for driving the first switch, a second switch connected in series to the excitation coil, an output signal of the input voltage detection means, and the standby release signal. And a second switch control means for controlling the on / off operation of the second switch.
The second switch control means turns on the second switch only when the input voltage level detected by the input voltage detection means is equal to or lower than a first upper limit value and the standby release signal is input. The power supply device according to claim 1, wherein the exciting coil turns on the first switch only when the second switch is turned on. The first switch is an electromagnetic relay;
The first switch control means is configured to receive an excitation coil for driving the first switch, third and fourth switches connected in series to the excitation coil, and the standby release signal. Third switch control means for controlling the on / off operation of the switch, and fourth switch control means for receiving the output signal of the input voltage detection means and controlling the on / off operation of the fourth switch,
The third switch control means turns on the third switch when the standby release signal is input, and the fourth switch control means determines that the input voltage level detected by the input voltage detection means is a first upper limit. 2. The fourth switch is turned on when the value is equal to or less than a value, and the exciting coil turns on the first switch only when both the third switch and the fourth switch are turned on. Or the power supply device of Claim 2. Rectifying means for converting the AC voltage of the AC power source into a DC voltage;
A first switch for switching the rectifying means from a full-wave rectification mode to a voltage doubler rectification mode during an ON operation;
First switch control means for controlling on / off operation of the first switch;
Output voltage detecting means for detecting a voltage level of the DC voltage output from the voltage control means including the rectifying means and the first switch and outputting an output signal corresponding to the DC voltage level to the first switch control means. Including
In the power supply device that converts the alternating voltage output from the alternating current power source into a direct current voltage and supplies the load to the load,
The first switch control means turns on the first switch only when the output voltage level detected by the output voltage detection means is less than or equal to the second upper limit value and a standby release signal is input from the outside. A power supply device characterized by that. The rectifying means includes a diode bridge circuit and at least two voltage dividing capacitors connected in series between positive and negative output terminals of the diode bridge circuit, and the first switch includes an intermediate point between the at least two capacitors and the diode. Connected between the AC input terminals of the bridge circuit, the first switch is an electromagnetic relay;
The first switch control means includes an exciting coil for driving the first switch, a second switch connected in series to the exciting coil, an output signal of the output voltage detecting means, and the standby release signal. And a second switch control means for controlling the on / off operation of the second switch.
The second switch control means turns on the second switch only when the output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value and the standby release signal is input. The power supply device according to claim 5, wherein the exciting coil turns on the first switch only when the second switch is turned on. The rectifying means includes a diode bridge circuit and at least two voltage dividing capacitors connected in series between positive and negative output terminals of the diode bridge circuit, and the first switch includes an intermediate point between the at least two capacitors and the diode. Connected between the AC input terminals of the bridge circuit, the first switch is an electromagnetic relay;
The first switch control means is configured to receive an excitation coil for driving the first switch, third and fourth switches connected in series to the excitation coil, and the standby release signal. Third switch control means for controlling the on / off operation of the switch; and fourth switch control means for receiving the output signal of the input detection means and controlling the on / off operation of the fourth switch;
The third switch control means turns on the third switch when the standby release signal is input, and the fourth switch control means determines that the output voltage level detected by the output voltage detection means is a second upper limit. 6. The fourth switch is turned on when the value is equal to or less than a value, and the exciting coil turns on the first switch only when both the third switch and the fourth switch are turned on. The power supply device described in 1. Rectifying means for converting the AC voltage of the AC power source into a DC voltage;
A first switch for switching the rectifying means from a full-wave rectification mode to a voltage doubler rectification mode during an ON operation;
First switch control means for controlling on / off operation of the first switch;
Input voltage detection means for detecting the voltage level of the AC power supply and outputting an output signal corresponding to the AC voltage level to the first switch control means;
Output voltage detecting means for detecting a voltage level of the DC voltage output from the voltage control means including the rectifying means and the first switch and outputting an output signal corresponding to the DC voltage level to the first switch control means. Including
In the power supply device that converts the alternating voltage output from the alternating current power source into a direct current voltage and supplies the load to the load,
The first switch control means has an input voltage level detected by the input voltage detection means that is equal to or lower than a first upper limit value, and an output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value. The power supply device is characterized in that the first switch is turned on only when a standby release signal is input from the outside. The rectifying means includes a diode bridge circuit and at least two voltage dividing capacitors connected in series between positive and negative output terminals of the diode bridge circuit, and the first switch includes an intermediate point between the at least two capacitors and the diode. Connected between the AC input terminals of the bridge circuit, the first switch is an electromagnetic relay;
The first switch control means includes an exciting coil for driving the first switch, a second switch connected in series to the exciting coil, and output signals of the input voltage detecting means and the output voltage detecting means. And a standby switch signal, and a second switch control means for controlling the on / off operation of the second switch,
The second switch control means has an input voltage level detected by the input voltage detection means that is equal to or lower than a first upper limit value, and an output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value. And the second switch is turned on only when the standby release signal is input, and the exciting coil turns on the first switch only when the second switch is turned on. The power supply device according to claim 8. The rectifying means includes a diode bridge circuit and at least two voltage dividing capacitors connected in series between positive and negative output terminals of the diode bridge circuit, and the first switch includes an intermediate point between the at least two capacitors and the diode. Connected between the AC input terminals of the bridge circuit, the first switch is an electromagnetic relay;
The first switch control means is configured to receive an excitation coil for driving the first switch, third and fourth switches connected in series to the excitation coil, and the standby release signal, or Third switch control means for controlling the on / off operation of the third switch upon input of the standby release signal and the output signal of the output voltage detection means, and the output signals of the input voltage detection means and the output voltage detection means And a fourth switch control means for controlling on / off operation of the fourth switch,
The third switch control means is configured to receive the standby release signal or when the standby release signal is input and the output voltage level detected by the output voltage detection means is equal to or lower than a second upper limit value. Turn on the third switch,
The fourth switch control means is configured such that the input voltage level detected by the input voltage detection means is not more than a first upper limit value and the output voltage level detected by the output voltage detection means is not more than a second upper limit value. 9. The fourth switch according to claim 8, wherein the fourth switch is turned on only when the first switch is turned on only when both the third switch and the fourth switch are turned on. Power supply.   5. The first switch control means further includes a first lower limit value, and is set to have a hysteresis characteristic between the first upper limit value and the first lower limit value. The power supply apparatus in any one of.   8. The first switch control means further has a second lower limit value, and is set to have a hysteresis characteristic between the second upper limit value and the second lower limit value. The power supply apparatus in any one of.   The first switch control means further includes a first lower limit value and / or a second lower limit value, and / or between the first upper limit value and the first lower limit value and / or the second upper limit value and the second lower limit value. 11. The power supply device according to claim 8, wherein the power supply device is set to have a hysteresis characteristic between the lower limit value and the lower limit value.   The input voltage detection means has a delay function, and even if the input voltage level detected by the input voltage detection means is equal to or lower than the first upper limit value, the input voltage detection means depends on the detected input voltage level until a predetermined time elapses. 14. The power supply device according to claim 1, wherein the output signal is not output to the first switch control means.   The said 1st switch control means has an insulation circuit for insulating between the said standby | release cancellation | release signal input and the internal circuit of the said 1st switch control means, The one of Claim 1 thru | or 14 characterized by the above-mentioned. The power supply device described in 1.   The power supply device according to claim 15, wherein the insulating circuit is a photocoupler or a transformer.   The power supply apparatus according to claim 1, wherein the first switch is a semiconductor element.   The power supply device according to claim 1, wherein a power-on signal for driving a load is used as the standby release signal.