JP2818645B2 - Dual / Multiple voltage level input switching power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a switching power supply,
In particular, the present invention relates to a switching power supply that can be connected to a plurality of power supplies having different voltages. More specifically, the present invention comprises at least a high voltage power input and another low voltage power input, wherein the secondary power supply provides reserve power to assist power in the event of an abnormal power supply of the first power supply. Things.

[0002]

2. Description of the Related Art A commonly used switching power supply has one input terminal connected to an external power supply as shown in FIG. In modern computer systems, a secondary power supply consisting of a separate battery is always used as a backup power supply, which can assist in supplying power when the main power supply (usually AC110V / 60HZ commercial power supply) cannot supply power normally. It is.

For example, when a computer system needs a continuous power supply, a continuous power supply system (UNINT) is always connected to a power input terminal of the switching power supply.
ERRUPTED POWER SUPLY. U.
P. S) needs to be inserted.

FIG. 1 shows one traditional switching power supply system, U.S. Pat. P. It is a block diagram of the state which combined S. As shown in FIG. 1, when the AC power supply is interrupted, U.S.P.
P. S immediately switches the DC voltage of the spare battery to the AC voltage so that power can be output without interruption.

[0005] Since the traditional switching power supply is designed so that one power supply can be connected as described above, this type of switching power supply is connected to a commercial AC power supply (1).
10V / 60HZ) when designing to use by connecting to external U, P. S always includes a set of conversion circuits for converting DC to AC, converts the DC voltage of the spare battery into an AC voltage of 110 V / 60 HZ, and sends the spare power to the switching power supply for use. .

[0006] This DC / AC conversion requires one very complicated circuit, and noise is generated during the conversion process, resulting in a loss of efficiency (power loss), and this circuit has a relatively high manufacturing cost. In addition to the high power, the power supply time of the spare battery is shortened due to the efficiency loss during the conversion.

In a modern notebook type computer, the power supply system usually includes an externally-converted AC to DC adapter, a built-in charging battery, and a built-in switching power supply. If a commercial AC power supply can be obtained, connect it to an AC power supply with an adapter that converts AC to DC, convert this to a low-voltage DC voltage,
It can be connected to a switching power supply in a notebook computer and used by the computer.

When a commercial AC voltage cannot be used, a built-in battery can be used as a power supply for the computer. The internal switching power supply is designed to receive a low-voltage DC voltage (usually from 12 volts to 24 volts) using a battery, convert it to the voltage required for each system, and output it. I have. Commercial AC voltage (usually 1
When 10V / 60HZ) is used as the power supply source, the AC voltage must first be converted to a DC low voltage of the same voltage as the battery by using an adapter that converts AC to DC, and then connected to the switching power supply. use. This AC to DC adapter requires high manufacturing costs, and its weight and volume hinders the portability of notebook computers.

[0009]

In view of the above-mentioned disadvantages of the traditional switching power supply, the present invention provides a kind of improved switching power supply, whereby the second power input terminal is separated. Of the switching power supply of the present invention may be affected or interrupted due to a power outage of the main power supply. There is no.

According to the invention, the main power supply is connected to the first input terminal of the switching power supply and converts it so that the switching circuit for outputting the voltage is the same as the switching power supply. The second power supply has a different voltage than the main power supply and is connected to a second input terminal of the improved switched power supply. The output of the voltage of the switching power supply device may occur when the main power supply fails or the power of the main power supply is insufficient to supply the load, or the voltage of the main power supply is unstable, or the load current is too large to cause ripple. If they do, they may be interfered or interrupted.

When such a situation occurs, the monitoring circuit automatically activates the power supply circuit and converts the voltage of the second power source, thereby obtaining the required voltage output, and thus the voltage output. The output is not interfered with by interruption, too low or unstable mains power.

When the main power supply recovers to a normal state, the monitoring circuit stops using the power of the secondary power supply, and converts the power to a voltage output by the voltage of the main power supply again. In addition, when a spare secondary power supply requires charging, the main power supply can be used as a power supply for the charging.

Accordingly, one of the objects of the present invention is to provide a traditional U.S.A. P. The object of the present invention is to eliminate a conversion circuit for converting DC into AC in S. In accordance with the present invention, a spare battery can be inserted into the second input terminal of the direct switching power supply and can directly convert its low DC voltage to the required output voltage, providing a traditional U.S.A. P. Since a conversion circuit for converting a necessary direct current into an alternating current in the S is not required, the manufacturing cost is reduced to the traditional U.S.A.
P. Much lower than S.

Another object of the present invention is to connect a standby power supply directly to a switching power supply and to convert it to the required output voltage, thereby providing a traditional U.S.A. P. The object of the present invention is to extend the power supply time of the standby power supply by reducing the conversion efficiency loss caused in the process of changing from DC to AC in S.

Another object of the present invention is to provide a more stable output voltage and reduce the reaction time of a spare battery. When the power of the main power supply is unstable or interrupted, or when the load current at the output terminal suddenly increases and exceeds the instantaneous power supply capability of the main power supply, the secondary power supply is used to support the main power supply. Voltage can be output stably. The standby power supply is directly connected to the switching power supply of the present invention, and does not need to pass through a conversion circuit for converting DC to AC, so that the reaction time is greatly reduced.

It is a further object of the present invention to eliminate the adapter that converts AC to DC used in notebook computers. According to the switching power supply of the present invention, the high-voltage DC voltage after the rectification and filtering of the AC voltage and the low-voltage DC voltage from the charging battery can be simultaneously connected to the switching power supply of the present invention. The adapter that converts to DC can be replaced with a small rectifying and filtering circuit,
As a result, the manufacturing cost can be greatly reduced. In addition, the weight of the notebook computer is greatly reduced and its portability is greatly enhanced.

[0017]

The present invention for achieving the above object has the following construction.

In the first configuration, the connection to the transformer circuit (2) is made.
Rectifier circuit that converts AC mains power to DC voltage (1)
, A secondary power supply (12) and a transformer circuit (2)
It has the following power input terminals (10, 14) and has a primary power input
Terminal (10) is connected to the main power supply via rectifier circuit (1).
The secondary power input terminal (14) is connected to the secondary power (12).
The first and second control input terminals (10B, 14B)
Switch from main power supply and secondary power supply (12) to transformer circuit (2)
First and second switching circuits for controlling the switching current
(4, 6), respectively.
Output terminals are first and second for feedback control with load.
Connected to the pulse width modulation circuit (3, 5), the first pulse width
The modulation circuit (3) is connected to the transformation circuit (2),
The first output terminal (3A) of the width modulation circuit (3) is connected to the first switch.
Connected to the first control terminal of the switching circuit (4).
The power terminal (3B) is connected to the monitoring circuit (7),
The output from (2) is used as a feedback control signal
And the first output terminal (3) of the first pulse width modulation circuit (3).
The output pulse from A) is the first switching circuit (4)
On-off operation of the first pulse width modulation circuit
The second output terminal (3B) of (3) is connected to the secondary power supply (12).
The operating state of the first switching circuit (4) thus supplied
The monitoring signal of the state is supplied to the monitoring circuit (7), and the second pulse width
The modulation circuit (5) is connected to the transformation circuit (2), and the monitoring circuit
(7) and the output terminal (5) of the second pulse width modulation circuit (5).
A) is connected to the second control terminal of the second switching circuit (6).
The output voltage from the transformer (2) is
Pulse width modulation circuit
The output pulse from (5) is the second switching circuit
The on-off operation of (6) is controlled, and the monitoring circuit (7)
The output of the second pulse width modulation circuit depends on the main power supply state.
Path (5) and the first switching circuit (4)
Connected to the pulse width modulation circuit (3) and the transformer circuit (2),
The on / off operation of the first switching circuit (4) is performed in the first
Control by the pulse width modulation circuit (3)
The switching current of the transformer circuit (2) supplied from the source is
The second switching circuit (6) controls the second pulse width change.
The second switch is connected to the control circuit (5) and the transformer circuit (2).
The on-off operation of the switching circuit (6) is performed by the second pulse width modulation.
Circuit (5) and a secondary power supply (1
Switching current of the transformer circuit (2) supplied from 2)
The monitoring circuit (7) is connected to the rectifier circuit (1) and the first pulse
The output of the monitoring circuit (7) is connected to the width modulation circuit (3).
The terminal (7A) is connected to the second pulse width modulation circuit (5).
From the rectifier circuit (1) and the first pulse width modulation circuit (3)
Voltage is monitored by the monitoring circuit (7),
If detected, the monitoring circuit (7) switches to the secondary power supply (12).
The second switching circuit (6) to start the supply of
It is activated.

In the second configuration, the transformer circuit (2)
Rectifier circuit that is connected and converts AC mains power to DC voltage
(1) The secondary power supply (12) and the transformer circuit (2) are primary
And a secondary power input terminal (10A, 14A).
The secondary power input terminal (10A) is connected to the main through a rectifier circuit (1).
Connected to the power supply and the secondary power input terminal (14A)
Connected to the secondary power supply (12) via the switch (8),
The control input terminal is connected to the switching circuit (4).
The switching circuit (4) is a transformation circuit from primary and secondary power supplies.
(2) controlling the switching current to the transformer circuit (2)
Output terminal (16) performs feedback control with the load
It is connected to a pulse width modulation circuit (3), the pulse width modulation circuit
(3) is also a switching circuit (4) and a monitoring circuit
Connected to both control input terminals of (7), the transformer circuit (2)
These outputs are used as feedback control signals and
From the pulse width modulation circuit (3) to the switching circuit (4)
The output pulse is an on-off operation of the switching circuit (4).
The operation is controlled and the output to the monitoring circuit (7) is switched.
Providing a signal relating to the operating state of the circuit (4).
The switching circuit (4) is a pulse width modulation circuit (3)
Connected to the transformer circuit (2) and the switching circuit (4)
ON-OFF operation is controlled by the pulse width modulation circuit (3).
Output from the pulse width modulation circuit (3)
The switching current of (2) is controlled, and the monitoring circuit (7)
Connected to the rectifier circuit (1) and the pulse width modulation circuit (3),
The output terminal of the monitoring circuit (7) is the current switch of the secondary power supply (12).
Switch (8) and the rectifier circuit (1)
The voltage signal from the adjustment circuit (3) is monitored by the monitoring circuit (7)
Monitoring circuit when power shortage is detected
(7) is a current for starting supply of the secondary power supply (12).
Activating the switch (8).

The third configuration comprises: (a) a primary input terminal (10) connected to a main power supply and a secondary input terminal (10).
And a secondary input terminal (14) connected to the power supply (12).
And no transformer circuit (2), (b) a power output terminal connected to a load (16), and (c) means for adjusting the output of the power supply (3, 4), (d) receiving the main power supply Voltage drops below a first specified voltage
The output voltage of the main power supply falls below the second specified voltage.
If the power drops, or if the main power is overloaded,
For detecting a power shortage situation
(7) and (e) means for adjusting the output of the power supply and the situation of power shortage
Means to detect power shortage and
Means for activating the next power supply.
Means for activating the secondary power supply when a situation is detected
Is, (i) the primary input terminal of the transformer circuit (2) (10)
Switch for controlling the current from the main power supply via
A ring circuit (4), of (ii) the first switching circuit (4) on - off movement
Adjust the output of the main power supply by controlling the operation
(Iii) a first pulse width modulation circuit (3); and (iii) the secondary input terminal (1) of the transformation circuit (2).
4) controlling the current from the secondary power supply (12) through
That the second switching circuit (6), on the (iv) said second switching circuit (6) - off kinematic
Adjust the output of the main power supply by controlling the operation
A second pulse width modulation circuit (5), and (v) monitoring a voltage from the primary input terminal (10).
On the other hand, monitor the voltage from the first pulse width modulation circuit (3)
And the voltage from the primary input terminal (10) and the first
The reference voltage and both voltages from the pulse width modulation circuit (3)
And the voltage from the primary input terminal (10)
The voltage from the first pulse width modulation circuit (3) is equal to the reference voltage.
Pressure, the second pulse width modulation circuit
A monitoring circuit (7) for operating (5).
And features.

The fourth configuration comprises: (a) a primary input terminal (10) connected to a main power supply and a secondary input terminal (10).
And a secondary input terminal (14) connected to the power supply (12).
And no transformer circuit (2), (b) a power output terminal connected to a load (16), and (c) means for adjusting the output of the power supply (3, 4), (d) receiving the main power supply Voltage drops below a first specified voltage
The output voltage of the main power supply falls below the second specified voltage.
If the power drops, or if the main power is overloaded,
For detecting a power shortage situation
(7) and (e) means for adjusting the output of the power supply, situation of power shortage
Means to detect power shortage and
Means for activating the next power supply.
Means for activating the secondary power supply when a situation is detected
Above, and the main power supply via the (i) the transformer circuit (2) Double
Switch for controlling both currents flowing from the secondary power supply (12)
A ring circuit (4), the on (ii) the switching circuit (4) - off operation
Control the output of the main power supply
The width modulation circuit (3), of (iii) the secondary power source (12) and said transformer circuit (2)
Provided between the secondary input terminal (14) and the power shortage
A switch (8) for closing a contact when a condition is detected; and (iv) monitoring a voltage from the primary input terminal (10).
On the other hand, the voltage from the pulse width modulation circuit (3) is monitored.
And the voltage from the primary input terminal (10) and the pulse
Ratio of both the voltage from the width modulation circuit (3) to the reference voltage
Comparing the voltage from the primary input terminal (10) with the pulse
The voltage from the width modulation circuit (3) is higher than the reference voltage.
If it is low, monitor to close the contact of the switch (8)
And a circuit (7).

[0022]

[0023]

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Detailed structure of the switching power supply of the present invention, the principle of application,
The effects and functions will be described.

As shown in FIGS. 2 and 4, the switching power supply of the present invention rectifies an AC voltage into a DC voltage by the rectifier circuit 1 and supplies the DC voltage to the transformer circuit 2 and the monitoring circuit 7. The transformer circuit 2 has two sets of input primary circuits (or primary coils), each connected to a different power supply, and can be expanded to more input circuits and output circuits if necessary.

The first input circuit is used for the main power supply, the line in this part is the same as the traditional switching power supply, and the second input circuit is used for the secondary power supply 12. The first input circuit is connected to the output terminal of the rectifier circuit 1, and this circuit is designed according to the magnitude of the voltage of the main power supply. The second input circuit is designed according to the magnitude of the voltage of the secondary power supply 12, and its voltage is usually lower than the voltage of the main power supply. The gist of the design of the second input circuit is to generate a sufficient current and magnetic flux in the primary coil according to the magnitude of the voltage of the secondary power supply, thereby converting the current into the output voltage of the transformer circuit 2. .
Since the first input circuit and the second input circuit are all placed in the transformer circuit 2 and can be designed together using one transformer, the voltage of the secondary power supply 12 is mainly used by the DC-AC converter. There is no need to raise it to the same level as the power supply voltage.

If the first input circuit of the main power supply produces sufficient current and magnetic flux and cannot be used for power conversion,
The power of the secondary power supply 12 is used immediately and supplements the part that cannot be supplied by the main power supply. The current of the main power supply and the secondary power supply 12 via the transformer circuit 2 is controlled by the first switching circuit 4 and the second switching circuit 6, respectively. The output voltage of the transformer circuit 2 is connected to the first pulse width modulation circuit 3 and the second pulse width modulation circuit 5 and used for voltage feedback.

The electric power of the main power supply and the electric power of the secondary power supply are converted into necessary output voltages via currents flowing through the transformer circuit 2. As described above, the first pulse width modulation circuit 3 is connected to the output of the transformer circuit 2, and the first pulse width modulation circuit 3 emits a pulse signal, and is connected to the first switching circuit 4. Thereby, the switching operation of the first switching circuit 4 is controlled, and thus the current flowing from the main power supply in the transformer circuit 2 is controlled.

Another output of the first pulse width modulation circuit 3 is connected to a monitoring circuit 7 to monitor the work status of the switching circuit belonging to the main power supply. The second pulse width modulation circuit 5 is connected to the output of the transformer circuit 2 and the output of the monitoring circuit 7, and the second pulse width modulation circuit 5 generates a pulse signal and is connected to the second switching circuit 6. As a result, the switching operation of the second switching circuit 6 is controlled, and thus the secondary power supply controls the current flowing through the transformer circuit 2.

The output of the monitoring circuit 7 controls the operation of the second pulse width modulation circuit 5, so that if the voltage from the main power supply is too low or interrupted or if sufficient power cannot be supplied to the load,
The second pulse width modulation circuit 5 is activated, thereby starting to use the secondary power supply.

As described above, the first switching circuit 4 is connected to the output of the first pulse width modulation circuit 3 and the second input of the conversion circuit 3. The first switching circuit 4 is a switch circuit. On the other hand, the first switching circuit 4 is controlled by an output pulse of the first pulse width modulation circuit 5, while the main power supply controls a current flowing in the transformer circuit 2. As described above, the second switching circuit 6 is connected to the output of the second pulse width modulation circuit 5 and the second input of the transformer circuit 2. The second switching circuit 6 is a switch circuit, which is controlled on the one hand by an output pulse of the pulse width modulation circuit 5, and on the other hand, the secondary power supply 12 controls a current flowing in the transformer circuit 2.

As described above, the monitoring circuit 7 is connected to the output of the first pulse width modulation circuit 3 and the output of the rectification circuit 1. The output of the monitoring circuit 7 is connected to the second pulse width modulation circuit 5 to control the operation of the second pulse width modulation circuit 5 and thus to control the power supply of the secondary power supply. If rectification is not possible, the power of the secondary power supply 12 is used immediately, supplementing the parts that cannot be supplied by the main power supply.

The currents of the main power supply and the secondary power supply 12 via the transformer circuit 2 are controlled by the first switching circuit 4 and the second switching circuit 6, respectively. The output voltage of the transformer circuit 2 is connected to the first pulse width modulation circuit 3 and the second pulse width modulation circuit 5, and is used for voltage feedback.
The power of the main power supply and the secondary power supply 12 is converted to a required output voltage via a current flowing in the transformer circuit 2. As described above, the first pulse width modulation circuit 3 is connected to the output of the transformer circuit 2, and the first pulse width modulation circuit 3 emits a pulse signal, and is connected to the first switching circuit 4. Thereby, the switching operation of the first switching circuit 4 is controlled, and thus the current flowing from the main power supply in the transformer circuit 2 is controlled.

Another output of the first pulse width modulation circuit 3 is connected to a monitoring circuit 7 to monitor the work status of the switching circuit belonging to the main power supply. The second pulse width modulation circuit 5 is connected to the output of the transformer circuit 2 and the output of the monitoring circuit 7, and the second pulse width modulation circuit 5 generates a pulse signal and is connected to the switching circuit 6. As a result, the switching operation of the switching circuit 6 is controlled, and thus the secondary power supply controls the current flowing through the transformer circuit 2.

The output of the monitoring circuit 7 controls the operation of the second pulse width modulation circuit 5, so that if the voltage generated by the main power supply is too low or interrupted or if sufficient power cannot be supplied to the load, the second pulse width modulation circuit 5 The width modulation circuit 5 is started, and the use of the secondary power supply is started. As described above, the first switching circuit 4 is connected to the output of the first pulse width modulation circuit 3 and the second input of the transformer circuit 2.

The first switching circuit 4 is a switch circuit, which is controlled by the output pulse of the first pulse width modulation circuit 3 and controls the current flowing in the transformer circuit 2 from the main power supply. As described above, the second switching circuit 6 is connected to the output of the second pulse width modulation circuit 5 and the second input of the transformer circuit 2. The second switching circuit 6 is a switch circuit, which is controlled by an output pulse of the pulse width modulation circuit 5 on the one hand, and controls a current flowing from the secondary power supply in the transformer circuit 2 on the other hand. As described above, the monitoring circuit 7 is connected to the output of the first pulse width modulation circuit 3 and the output of the rectifier circuit 1.

The output of the monitoring circuit 7 is connected to the second pulse width modulation circuit 5, and controls the operation of the second pulse width modulation circuit 5 and thus the power supply of the secondary power supply. Rectifier circuit 1
Is too low or the output of the first pulse width modulation circuit 3 exhibits an overload situation, the monitoring circuit 7 immediately activates the second pulse width modulation circuit 5, and the system operates with the power of the secondary power supply. It is convenient to supply power.

FIGS. 3 and 5 show another type of switching power supply according to the present invention, which comprises a rectifier circuit 1, a conversion circuit 3, a first switching circuit 4, and a monitoring circuit 7. The above circuits are all the same as those shown in FIGS.

The secondary power supply in the present system is designed to share a set of switching control circuits with the main power supply. Therefore, the second pulse width modulation circuit 5 and the switching power supply shown in FIGS. The circuit 6 is omitted in FIGS. 3 and 5, and the current supply of the secondary power supply in FIGS. 3 and 5 is controlled by a newly added switch circuit 8, and the switch circuit 8 comprises a monitoring circuit 7 Is connected to and controlled by this output. When the monitoring circuit 7 determines that the secondary power supply should support power supply, the switch circuit 8 is activated, and the secondary power supply supplies power to the transformer circuit 2 via the second input. The first and second input circuits in the transformer circuit 2 are all connected to a control circuit composed of a first switching circuit 4 and a pulse width modulation circuit 3, and the principle of operation is the same as that described with reference to FIGS. It is.

As described above, the switching power supply of the present invention is certainly useful, and corresponds to the case of a new invention patent under the Patent Law. It should be emphasized that what has been described above belongs to the depiction of the relatively ideal embodiment of the present invention, and that other combinations and variations of the present invention may be made by any ordinary engineer having the ability to design circuits. Easy to understand and achieve. Therefore, if the effects obtained after partially changing or modifying the concept of the present invention do not exceed the spirit included in the present specification and the accompanying drawings, they should be regarded as all falling within the scope of the present invention.

[0041]

The switching power supply of the present invention can be directly connected to two or more power supplies of different voltages at the same time. Therefore, U.S. P. S is connected directly to the switching power supply and the traditional U.S. P. The conversion circuit for converting the necessary direct current to alternating current in S is omitted. And traditional U.S. P. The power loss that occurs when converting DC to AC in S is avoided, and the power supply time of the spare battery can be extended as compared with the traditional type. In addition, since the reserve power can be used without requiring DC-AC conversion, the reaction time of the reserve power is the same as the conventional U.S.A. P. Shorter than S.

Since the switching power supply of the present invention can use two sets of power supplies at the same time, its output voltage is more stable than that of the conventional type. This is particularly effective when the load current suddenly increases and exceeds the instantaneous power supply capability of the main power supply. In addition, if the switching power supply device of the present invention is installed in a notebook type computer, the adapter that converts the original alternating current to direct current can be replaced by a set of simple rectifying and filtering circuits. The manufacturing cost and weight of the computer are greatly reduced.

[Brief description of the drawings]

FIG. 1: U.S. Pat. P. It is a block diagram in the state where S system was provided outside.

FIG. 2 is a block diagram of one system of the present invention.

FIG. 3 is a block diagram of another heterogeneous configuration system of the present invention.

FIG. 4 is an example diagram of the system shown in the block diagram of FIG. 2;

FIG. 5 is an example diagram of the system shown in the block diagram of FIG. 3;

FIG. 6 is an embodiment diagram of a traditional switching power supply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rectifier circuit, 2 ... Transformer circuit, 3 ... First pulse width modulation circuit, 4 ... First switching circuit, 5 ... Second pulse width modulation circuit, 6 ... Second switching circuit, 7 ... Monitoring circuit, 8 ... Switch circuit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02J 9/00-9/08

Claims (4)

(57) [Claims] 1. An AC mains power supply connected to a transformer circuit (2).
A rectifier circuit (1) for converting to a DC voltage, a secondary power supply (12), and a transformer circuit (2) are provided with primary and secondary power supply input terminals (10,
14), and the primary power input terminal (10) is a rectifier circuit.
(1) connected to the main power supply, and the secondary power supply input terminal
(14) is connected to the secondary power source (12),
The input terminals (10B, 14B) are the main power supply and the secondary power supply (1
Control the switching current from 2) to the transformer circuit (2)
Connected to the first and second switching circuits (4, 6), respectively.
The output terminal of the transformer circuit (2) is connected to a load and a feeder.
First and second pulse width modulation circuits (3,
5), and the first pulse width modulation circuit (3) is connected to the transformer circuit (2).
And the first output terminal (3) of the first pulse width modulation circuit (3).
A) is connected to the first control terminal of the first switching circuit (4).
The second output terminal (3B) is connected to the monitoring circuit (7)
And the output from the transformer (2) is feedback controlled.
Signal, and is used as a signal of the first pulse width modulation circuit (3).
The output pulse from one output terminal (3A) is
And a second output terminal (3B) of the first pulse width modulation circuit (3).
Is the first switch supplied by the secondary power supply (12)
Monitoring circuit (7) for monitoring the operating state of the switching circuit (4)
And the second pulse width modulation circuit (5) is connected to the transformer circuit (2).
Output from the monitoring circuit (7) and the second pulse width modulation circuit (5).
The force terminal (5A) is the second control of the second switching circuit (6).
Output terminal from the transformer circuit (2).
Used as feedback control signal,
The output pulse from the adjustment circuit (5) is the second switching time.
The on / off operation of the road (6) is controlled and the monitoring circuit (7)
These outputs are second pulse width modulated according to the state of main power supply
Controlling a circuit (5), wherein a first switching circuit (4) is a first pulse width modulation circuit
(3) and connected to the transformer circuit (2), the first switching
The on-off operation of the circuit (4) is a first pulse width modulation circuit
Controlled by (3) and supplied from the main power supply
And a second switching circuit (6) for controlling a switching current of the transformer circuit (2).
(5) Connected to the transformer circuit (2), the second switching
The on-off operation of the circuit (6) is performed by a second pulse width modulation circuit.
(5) controlled by the secondary power supply (12)
The switching current of the transformer circuit (2) supplied from
The monitoring circuit (7) is connected to the rectifier circuit (1) and the first pulse width modulation circuit.
To the output terminal (7) of the monitoring circuit (7).
A) is connected to the second pulse width modulation circuit (5),
The voltage from the circuit (1) and the first pulse width modulation circuit (3) is monitored.
Monitored by visual circuit (7), power shortage was detected
In this case, the monitoring circuit (7) opens the supply of the secondary power (12).
Activate the second switching circuit (6) to start
Dual / multiple voltage level input switching power supply
apparatus. 2. An AC mains power supply connected to a transformer circuit (2).
A rectifier circuit (1) for converting to a DC voltage, a secondary power supply (12), and a transformer circuit (2) are provided with primary and secondary power supply input terminals (10
A, 14A), and the primary power input terminal (10A) is
Connected to the main power supply through the power circuit (1)
The terminal (14A) is connected to the secondary power supply via the current switch (8).
(12), the control input terminal is a switching circuit
The switching circuit (4) is connected to the primary and secondary
Controls the switching current from the next power supply to the transformer circuit (2)
The output terminal (16) of the transformer circuit (2) is
Connected to the pulse width modulation circuit (3) for feedback control
The pulse width modulation circuit (3) also includes a switching circuit.
(4) connected to both control input terminals of the monitoring circuit (7),
The output from the transformer (2) is a feedback control signal
Used as a switch from the pulse width modulation circuit (3).
The output pulse to the switching circuit (4) is a switching circuit
The on / off operation of (4) is controlled, and the monitoring circuit (7)
The output is a signal about the operating state of the switching circuit (4).
The switching circuit (4) is different from the pulse width modulation circuit (3).
Voltage circuit (2) and the switching circuit (4)
The on-off operation is controlled by the pulse width modulation circuit (3).
Output from the pulse width modulation circuit (3)
The switching current of (2) is controlled, and the monitoring circuit (7) includes a rectifier circuit (1) and a pulse width modulation circuit.
The output terminal of the monitoring circuit (7) is connected to the secondary
Rectifier circuit connected to the current switch (8) of the source (12)
The voltage signals from (1) and the pulse width modulation circuit (3) are monitored.
Monitored by visual circuit (7), power shortage was detected
In this case, the monitoring circuit (7) opens the supply of the secondary power (12).
Activate the current switch (8) to start
Dual / multiple voltage level input switching power supply. 3. A primary input terminal connected to a main power supply
(10) and a secondary input terminal connected to the secondary power supply (12)
( B) a power supply output terminal (16) connected to a load, (c) means (3, 4) for adjusting the output of the power supply, (d ) ) The incoming voltage of the main power supply drops below the first specified voltage
The output voltage of the main power supply falls below the second specified voltage.
If the power drops, or if the main power is overloaded,
For detecting a power shortage situation
(7) and (e) means for adjusting the output of the power supply and the situation of power shortage
Means to detect power shortage and
Means for activating the next power supply.
Means for activating the secondary power supply when a situation is detected
Is, (i) the primary input terminal of the transformer circuit (2) (10)
Switch for controlling the current from the main power supply via
A ring circuit (4), of (ii) the first switching circuit (4) on - off movement
Adjust the output of the main power supply by controlling the operation
(Iii) a first pulse width modulation circuit (3); and (iii) the secondary input terminal (1) of the transformation circuit (2).
4) controlling the current from the secondary power supply (12) through
That the second switching circuit (6), on the (iv) said second switching circuit (6) - off kinematic
Adjust the output of the main power supply by controlling the operation
A second pulse width modulation circuit (5), and (v) monitoring a voltage from the primary input terminal (10).
On the other hand, monitor the voltage from the first pulse width modulation circuit (3)
And the voltage from the primary input terminal (10) and the first
The reference voltage and both voltages from the pulse width modulation circuit (3)
And the voltage from the primary input terminal (10)
The voltage from the first pulse width modulation circuit (3) is equal to the reference voltage.
Pressure, the second pulse width modulation circuit
A monitoring circuit (7) for operating (5).
Dual / multiple voltage level input switching power supply
apparatus. 4. A primary input terminal connected to a main power supply
(10) and a secondary input terminal connected to the secondary power supply (12)
( B) a power supply output terminal (16) connected to a load, (c) means (3, 4) for adjusting the output of the power supply, (d ) ) The incoming voltage of the main power supply drops below the first specified voltage
The output voltage of the main power supply falls below the second specified voltage.
If the power drops, or if the main power is overloaded,
For detecting a power shortage situation
(7) and (e) means for adjusting the output of the power supply, situation of power shortage
Means to detect power shortage and
Means for activating the next power supply.
Means for activating the secondary power supply when a situation is detected
Above, and the main power supply via the (i) the transformer circuit (2) Double
Switch for controlling both currents flowing from the secondary power supply (12)
A ring circuit (4), the on (ii) the switching circuit (4) - off operation
Control the output of the main power supply
The width modulation circuit (3), of (iii) the secondary power source (12) and said transformer circuit (2)
Provided between the secondary input terminal (14) and the power shortage
A switch (8) for closing a contact when a condition is detected; and (iv) monitoring a voltage from the primary input terminal (10).
On the other hand, the voltage from the pulse width modulation circuit (3) is monitored.
And the voltage from the primary input terminal (10) and the pulse
Ratio of both the voltage from the width modulation circuit (3) to the reference voltage
Comparing the voltage from the primary input terminal (10) with the pulse
Than voltage and said references voltage from width modulation circuit (3)
If it is low, monitor to close the contact of the switch (8)
And a circuit (7).
Heavy voltage level input switching power supply.