JP2016195520A - Rush current protecting circuit, motor, and blowing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rush current protecting circuit, a motor, and a blowing device, capable of reducing rush current, and suppressing steady power consumption and heat output without complicating control.SOLUTION: A rush current protecting circuit which uses AC voltage of the AC power supply connected to a first input terminal T51 and a second input terminal T52 as an input comprises: a rectifying circuit 1 which rectifies the AC of the AC power supply and outputs the rectified AC between a first output terminal T15 and a second output terminal T16; a first smoothing capacitor 21 and a second smoothing capacitor 22 connected in series and for smoothing the output of the rectifying circuit 1; a resistor 31 which is a rush current suppressing element in which one end is connected to the first output terminal T15 and the other end is connected to the second smoothing capacitor 21; and a resistor 32 which is a rush current suppressing element in which one end is connected to the second output terminal T16 and the other end is connected to the second smoothing capacitor 22. A connection point T2 between the first smoothing capacitor 21 and the second smoothing capacitor 22 is connected to any of the first input terminal T51 and the second input terminal T52.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inrush current protection circuit having a rectifier circuit, a motor, and a blower.

  In order to save energy or reduce noise, the motor may be driven by an inrush current protection circuit. The inrush current protection circuit uses a DC power supply as an input. For this reason, a rectifier circuit that converts an AC voltage into a DC voltage may be provided on the input side of the inverter circuit.

  The rectifier circuit performs full-wave rectification of the AC voltage using a bridge-connected diode. In order to smooth the voltage that has been full-wave rectified by the rectifier circuit, a capacitor may be connected to the rectifier circuit. As this capacitor, an electrolytic capacitor may be used. The capacitor has a low impedance in terms of AC. For this reason, a large current may be instantaneously input to the inverter circuit in a state where the electrolytic capacitor charge does not accumulate when the power is turned on. This momentary excessive input current is called inrush current.

  The inrush current may threaten the proof strength of the parts constituting the inverter circuit. The components constituting the inverter circuit are, for example, current fuses, rectifier diodes, switches and relays that control power-on. These parts may be damaged if the instantaneous inrush current at power-on exceeds the current proof strength of the part. For example, the switch contacts may be welded by the energy of the current.

  In order to prevent such a problem from occurring, it is necessary to take measures to suppress an inrush current by inserting a resistor or a resistance element having temperature dependency in series with the power supply line. Some temperature-dependent elements have NTC characteristics in which the resistance value is large when the temperature is low, and the resistance value decreases as the temperature increases. Inrush current can be suppressed by using a temperature-dependent element having NTC characteristics.

  A temperature-dependent element having NTC characteristics is such that when a steady current continues to flow after an inrush current flows, the temperature rises due to self-heating, the resistance value decreases, and the steady current is energized. Has the function of suppressing the heat generation. However, the resistance value does not always become zero even when the resistance value decreases, and the actual situation is that heat generation due to the reduced resistance value cannot be avoided.

  Here, Patent Document 1 describes a technique of closing both ends of an element with a relay or the like after an inrush current flows. According to the technique described in Patent Document 1, it is possible to eliminate a steady loss in an element for suppressing an inrush current. Similarly, the technique described in Patent Document 2 is also a technique for closing both ends of the element with a relay or the like after an inrush current flows.

Japanese Patent No. 2636475 JP 2012-110183 A

  According to the techniques described in Patent Document 1 and Patent Document 2, it is necessary to measure the timing until both ends of the element are closed, and a control circuit for closing both ends of the element is required. For this reason, according to the techniques described in Patent Literature 1 and Patent Literature 2, there are problems that the control becomes complicated and the number of parts increases.

  Although the resistance element provided to suppress the inrush current can suppress the inrush current, it normally consumes unnecessary power, and may cause adverse effects on the surroundings such as heat generation of the element.

  In order to suppress a large current, a resistor having a large resistance for limiting the current is required. However, the larger the current that constantly flows through the element, the greater the heat generated by the element. It is necessary to check the balance between the allowable value of the inrush current and the heat generation during energization.

  The present invention has been made in view of the above, and an inrush current protection circuit, a motor, and a blower that can reduce inrush current without complicating control and can suppress steady power consumption and heat generation. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, an inrush current protection circuit according to an aspect of the present invention receives an AC voltage of an AC power source connected to a first input terminal and a second input terminal as an input. An inrush current protection circuit that rectifies the alternating current of the alternating current power source and outputs the rectified current between a first output terminal and a second output terminal, and smoothes the output of the rectifier circuit. The connected first and second smoothing capacitors, a first inrush current suppressing element having one end connected to the first output terminal and the other end connected to the first smoothing capacitor, and one end of the first smoothing capacitor A second inrush current suppression element connected to the second output terminal and having the other end connected to the second smoothing capacitor, and the connection between the first smoothing capacitor and the second smoothing capacitor The points are the first input terminal and the second input terminal. A rush current protection circuit connected to one of the.

  The inrush current protection circuit, the motor, and the blower according to the present invention have an effect of reducing the inrush current without complicating the control, and suppressing steady power consumption and heat generation.

The figure which shows the structure of the inrush current protection circuit concerning Embodiment 1 of this invention. The figure which shows the state where the inrush current was applied to the inrush current protection circuit concerning Embodiment 1 of this invention. The figure which shows the state where the inrush current was applied to the inrush current protection circuit concerning Embodiment 1 of this invention. The figure which shows the waveform of a power supply voltage, and the waveform of the input current which arises in an inrush current protection circuit in the inrush current protection circuit concerning Embodiment 1 of this invention. The figure which shows the comparative example with respect to Embodiment 1 of this invention The figure which shows the state in which the inrush current was applied to the inrush current protection circuit shown in FIG. The figure which shows the state in which the inrush current was applied to the inrush current protection circuit shown in FIG. The figure which shows the structure of the inrush current protection circuit concerning Embodiment 2 of this invention. The figure which shows the state where the inrush current was applied to the inrush current protection circuit concerning Embodiment 2 of this invention. The figure which shows the state where the inrush current was applied to the inrush current protection circuit concerning Embodiment 2 of this invention. The figure which shows the example of the motor which controlled the inrush current with the inrush current protection circuit The figure which shows in more detail the connection state of the motor shown in FIG. 11, an inrush current protection circuit, and a drive circuit. The figure which shows the example of the motor which has inrush current protection circuit The figure which shows the inside of the motor shown in FIG. 13 in detail The figure which shows the example of the air blower comprised using the motor shown in FIG. The figure which shows the example of the air blower comprised using the motor shown in FIG.

  Hereinafter, an inrush current protection circuit according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a diagram illustrating a configuration of an inrush current protection circuit according to a first embodiment of the present invention. The inrush current protection circuit 100 shown in FIG. 1 receives an AC voltage input between an input terminal T51, which is a first input terminal, and an input terminal T52, which is a second input terminal.

  In FIG. 1, the inrush current protection circuit 100 rectifies an AC voltage by an AC power source 10 connected between an input terminal T51 and an input terminal T52. The AC power supply 10 is a commercial power supply, for example.

  The inrush current protection circuit 100 includes a rectifier circuit 1 having a diode bridge constituted by diodes connected in a bridge shape, and a smoothing capacitor 2 for smoothing the output of the rectifier circuit 1 to generate a direct current with little voltage ripple. And resistors 31 and 32 provided between the rectifier circuit 1 and the smoothing capacitor 2. The inrush current protection circuit 100 operates as a voltage doubler rectifier circuit.

  The rectifier circuit 1 has a diode bridge composed of diodes 11, 12, 13 and 14. The rectifier circuit 1 receives an AC voltage of an AC power source connected to the input terminal T51 and the input terminal T52 as an input. The rectifier circuit 1 rectifies the alternating current of the alternating current power source and outputs it between the output terminal T15 that is the first output terminal and the output terminal T16 that is the second output terminal.

  The diode 11 has an anode connected to the input terminal T51 and a cathode connected to the output terminal T15 of the diode bridge. The diode 12 has an anode connected to the input terminal T52 and a cathode connected to the output terminal T15 of the diode bridge. The diode 13 has an anode connected to the output terminal T16 of the diode bridge and a cathode connected to the input terminal T51. The diode 14 has an anode connected to the output terminal T16 of the diode bridge and a cathode connected to the input terminal T52.

  The anode of the diode 11 and the cathode of the diode 13 are connected, and the anode of the diode 12 and the cathode of the diode 14 are connected.

  The smoothing capacitor 2 is provided on the output side of the rectifier circuit 1. The smoothing capacitor 2 is inserted in the signal line from the output terminal T15 and the output terminal T16 of the diode bridge to the output terminal T21 and the output terminal T22. The smoothing capacitor 2 has one end connected to the output terminal T21 and the other end connected to the output terminal T22. A load 4 is connected between the output terminal T21 and the output terminal T22. The load 4 is, for example, a drive circuit that drives a motor.

  The inrush current protection circuit 100 applies a voltage smoothed by the smoothing capacitor 2 to the load 4. The smoothing capacitor 2 includes a smoothing capacitor 21 that is a first smoothing capacitor and a smoothing capacitor 22 that is a second smoothing capacitor. The smoothing capacitor 21 and the smoothing capacitor 22 are connected in series. The smoothing capacitor 21 and the smoothing capacitor 22 smooth the output of the rectifier circuit 1.

  In this example, the connection point T2 between the first smoothing capacitor 21 and the second smoothing capacitor 22 is connected to the second input terminal T52. The connection point T2 is connected to one of the first input terminal T51 and the second input terminal T52. That is, the connection point T2 may be connected to the first input terminal T51 without being connected to the second input terminal T52.

  One end of the resistor 31 is connected to the output terminal T15 of the diode bridge, and the other end is connected to the first smoothing capacitor 21. One end of the resistor 32 is connected to the output terminal T <b> 16 of the diode bridge, and the other end is connected to the second smoothing capacitor 22. The resistor 31 and the resistor 32 function as a first inrush current suppression element and a second inrush current suppression element. That is, in the first embodiment, both the first inrush current suppression element and the second inrush current suppression element are resistance elements.

(Inrush current path)
2 and 3 are diagrams showing a state in which an inrush current is applied to the inrush current protection circuit 100 according to the first embodiment of the present invention. FIG. 2 is a diagram showing a state where the input terminal T51 is on the positive side and the input terminal T52 is on the negative side, and FIG. 3 is a diagram showing a state where the input terminal T52 is on the positive side and the input terminal T51 is on the negative side. Since the polarity of the AC power supply 10 changes, the inrush current protection circuit 100 alternately repeats the state shown in FIG. 2 and the state shown in FIG.

  In the state shown in FIG. 2, the input current I (+) flows through the inrush current protection circuit 100 along the path R11. The path R11 is a path that flows from the input terminal T51 through the diode 11, the resistor 31, the smoothing capacitor 21, and the connection point T2 to the input terminal T52 in order.

  On the other hand, in the state shown in FIG. 3, the input current I (−) flows through the inrush current protection circuit 100 along the path R12. The path R12 is a path that flows from the input terminal T52 to the input terminal T51 through the connection point T2, the smoothing capacitor 22, the resistor 32, and the diode 13 in this order.

  That is, in the first embodiment, in order to prevent an excessive current from flowing when the power is turned on, a resistor which is an inrush current suppressing element is provided in the current paths R11 and R12 flowing into the smoothing capacitors 21 and 22. 31 and 32 are connected in series. In the first embodiment, charges are accumulated, that is, charged in the smoothing capacitors 21 and 22 through the resistors 31.32 through separate paths R11 and R12. For this reason, the inrush current is suppressed separately for the smoothing capacitors 21 and 22 by the resistors 31 and 32 which are inrush current suppressing elements.

  When the polarity of the AC power supply 10 changes, the current inflow path changes. For this reason, only a half wave of the waveform of the power supply voltage V flows through each of the path R11 and the path R12. Therefore, the resistors 31 and 32 consume power with a current that is about ½ of the current corresponding to the power supply voltage V.

  If the current flowing through the resistors 31 and 32 is about ½, the power consumption is proportional to the square of the current, so that the power consumption in the resistors 31 and 32 is ¼ and the power consumption is suppressed. An effect is obtained. If the power consumption is reduced to ¼, heat generation in the resistors 31 and 32 can be suppressed, so that a resistor element having a smaller rated power can be used for the resistors 31 and 32. By using a resistance element having a smaller rated power, the manufacturing cost of the inrush current protection circuit 100 can be reduced. The rated power of the resistor is an allowable loss that is determined in order to prevent the resistor itself from deteriorating due to the temperature of the resistor itself due to the heat generated by the resistor itself.

(Inrush current waveform)
FIG. 4 is a diagram illustrating the waveform of the power supply voltage V and the waveform of the input current I generated in the inrush current protection circuit 100 in the inrush current protection circuit 100 according to the first embodiment of the present invention. In FIG. 4, the waveform of the power supply voltage V is a sine wave.

  FIG. 4 shows the input current I (+) flowing through the path R11 and the input current I (−) flowing through the path R12, which form the waveform of the input current I.

  When charge is not accumulated in the smoothing capacitors 21 and 22 when the power supply voltage V is input, as shown in FIG. 4, the input current I (+) and the input current I (−) flow alternately. In FIG. 4, the input current I (−) is shown inverted. As shown in FIG. 4, the input current I (+) and the input current I (−) have waveforms that gradually attenuate.

(Comparative example)
Here, a comparative example for the inrush current protection circuit 100 described with reference to FIGS. 1 to 4 will be described. FIG. 5 is a diagram showing a comparative example with respect to the first embodiment of the present invention. 6 and 7 are diagrams showing a state in which an inrush current is applied to the inrush current protection circuit 110 shown in FIG. 6 is a diagram showing a state where the input terminal T51 is on the positive side and the input terminal T52 is on the negative side, and FIG. 7 is a diagram showing a state where the input terminal T52 is on the positive side and the input terminal T51 is on the negative side.

  The inrush current protection circuit 110 shown in FIG. 5 has a configuration in which an inrush current suppression element 3 is provided between a connection point T2 and an input terminal T52. The inrush current suppression element 3 is, for example, a resistor. Since the polarity of the AC power supply 10 changes, the inrush current protection circuit 110 alternately repeats the state shown in FIG. 6 and the state shown in FIG.

  In the state shown in FIG. 6, the input current I (+) flows through the inrush current protection circuit 110 along the path R21. The path R21 is a path that flows from the input terminal T51 to the input terminal T52 through the diode 11, the smoothing capacitor 21, the connection point T2, and the inrush current suppression element 3 in order.

  On the other hand, in the state shown in FIG. 7, the input current I (−) flows through the inrush current protection circuit 110 along the path R22. The path R22 is a path that flows from the input terminal T52 to the input terminal T51 through the inrush current suppression element 3, the connection point T2, the smoothing capacitor 22, and the diode 13 in order.

  Therefore, in the inrush current protection circuit 110, a current flows through the inrush current suppression element 3 in both the path R21 in the state shown in FIG. 6 and the path R22 in the state shown in FIG. For this reason, the effect that the power consumption mentioned above is suppressed does not arise.

Embodiment 2. FIG.
FIG. 8 is a diagram illustrating a configuration of the inrush current protection circuit 120 according to the second embodiment of the present invention. The inrush current protection circuit 120 shown in FIG. 8 uses thermistors 61 and 62 as inrush current suppression elements instead of the resistors 31 and 32 shown in FIG.

  The thermistors 61 and 62 are temperature dependent resistors. The thermistors 61 and 62 have NTC (negative temperature coefficient) characteristics in which the resistance value decreases as the temperature increases. That is, the thermistors 61 and 62 generate heat due to the current supplied in a steady state, the temperature rises, and the resistance value decreases. As a result, the power consumption in the thermistors 61 and 62 is reduced, and the heat generation can be reduced.

  The thermistor 61 has one end connected to the output terminal T15 of the diode bridge and the other end connected to the first smoothing capacitor 21. The thermistor 62 has one end connected to the output terminal T16 of the diode bridge and the other end connected to the second smoothing capacitor 22. The thermistors 61 and 62 function as a first inrush current suppression element and a second inrush current suppression element. That is, in the inrush current protection circuit 120 of the second embodiment, both the first inrush current suppression element and the second inrush current suppression element are thermistors.

  As the thermistors 61 and 62, for example, an NTC thermistor of SCK15 series WB100525 manufactured by Thinking Electronic Industrial Co. can be used.

(Inrush current)
9 and 10 are diagrams showing a state in which an inrush current is applied to the inrush current protection circuit 120 according to the second embodiment of the present invention. 9 is a diagram showing a state where the input terminal T51 is on the positive side and the input terminal T52 is on the negative side, and FIG. 10 is a diagram showing a state where the input terminal T52 is on the positive side and the input terminal T51 is on the negative side. Since the polarity of the AC power supply 10 changes, the inrush current protection circuit 120 alternately repeats the state shown in FIG. 9 and the state shown in FIG.

  In the state shown in FIG. 9, the input current I (+) flows through the inrush current protection circuit 120 along the path R11. The path R11 is a path that flows from the input terminal T51 to the input terminal T52 through the diode 11, the thermistor 61, the smoothing capacitor 21, and the connection point T2 in this order.

  On the other hand, in the state shown in FIG. 10, the input current I (−) flows through the inrush current protection circuit 120 along the path R12. The path R12 is a path that flows from the input terminal T52 to the input terminal T51 through the connection point T2, the smoothing capacitor 22, the thermistor 62, and the diode 13 in this order.

  That is, in the second embodiment, in order to prevent an excessive current from flowing when the power is turned on, the thermistors 61 and 62 which are inrush current suppressing elements are provided in the current paths R11 and R12 flowing into the smoothing capacitors 21 and 22. Are connected in series. Inrush current is suppressed by thermistors 61 and 62 which are inrush current suppression elements.

(Summary)
According to the first embodiment and the second embodiment described above, even if the resistance value for suppressing is increased by inserting the inrush current suppressing element into the path that flows every half wave, the current is constantly energized. Therefore, a rectifier circuit that suppresses heat generation of the inrush current suppressing element can be realized. As a result, it is possible to suppress an excessive current when the power is turned on, to suppress a loss that occurs regularly, to reduce adverse effects on the surroundings due to heat generation of the element, and to improve reliability. Therefore, the fuse blown by the inrush current when the power is turned on and the damage of the semiconductor element can be prevented, and the heat generation of the current suppressing element can be reduced even during steady operation, and at the same time due to the heat to the surrounding parts Adverse effects can be suppressed.

(motor)
FIG. 11 is a diagram illustrating an example of the motor 50 in which the inrush current is suppressed by the inrush current protection circuit 100 described above. The motor 50 is, for example, a direct current brushless motor.

  In FIG. 11, the motor 50 has a three-phase winding 300 and a rotating shaft J. An inrush current protection circuit 100 and a drive circuit 200 that functions as an inverter circuit are connected to the motor 50. In FIG. 11, the motor 50 rotates the rotation axis J in the direction of the arrow Y or the opposite direction by the magnetic field generated by the winding 300.

  FIG. 12 is a diagram showing in more detail the connection state between the motor 50 shown in FIG. 11 and the inrush current protection circuit 100 and the drive circuit 200. In FIG. 12, the configuration of the inrush current protection circuit 100 is the same as the configuration described with reference to FIGS. The drive circuit 200 includes a switching element group 201 for converting a DC voltage into an AC voltage, a current sensor 202 that detects a current supplied to the three-phase winding 300, and a switching element based on the detection result of the current sensor 202. And a control circuit 203 that controls the group 201.

  Since the inrush current protection circuit 100 is connected to the motor 50 shown in FIGS. 11 and 12, the inrush current can be reduced and steady power consumption and heat generation can be suppressed. Therefore, a more efficient control circuit can be realized, and an efficient motor with low power consumption can be realized.

  11 and 12, the inrush current protection circuit 120 described with reference to FIG. 9 may be used instead of the inrush current protection circuit 100.

  FIG. 13 is a diagram illustrating an example of a motor 500 incorporating the inrush current protection circuit 100 described above. The motor 500 is, for example, a direct current brushless motor.

  In FIG. 13, the motor 500 includes an inrush current protection circuit 100, a drive circuit 200 that functions as an inverter circuit, a three-phase winding 300, and a rotating shaft J. In FIG. 13, the motor 500 rotates the rotation axis J in the direction of arrow Y or the opposite direction by the magnetic field generated by the winding 300.

  FIG. 14 is a diagram showing the motor 500 shown in FIG. 13 in more detail. In FIG. 14, the configuration of the inrush current protection circuit 100 is the same as the configuration described with reference to FIGS. The drive circuit 200 includes a switching element group 201 for converting a DC voltage into an AC voltage, a current sensor 202 that detects a current supplied to the three-phase winding 300, and a switching element based on the detection result of the current sensor 202. And a control circuit 203 that controls the group 201.

  Since the motor 500 shown in FIG. 13 and FIG. 14 has the inrush current protection circuit 100, it is possible to reduce the inrush current and suppress steady power consumption and heat generation. Therefore, a more efficient control circuit can be realized, and an efficient motor with low power consumption can be realized.

  13 and 14, the inrush current protection circuit 120 described with reference to FIG. 9 may be used instead of the inrush current protection circuit 100.

(Blower)
FIG. 15 is a diagram illustrating an example of a blower 400 configured using the motor 50 illustrated in FIG. 11. The blower 400 is, for example, a ventilation fan.

  In FIG. 15, the blower 400 includes the motor 50 described with reference to FIGS. 11 and 12. The blower 400 includes a panel 401 and a rotary blade 402 provided in the panel 401 and driven by the motor 50. The inrush current protection circuit described with reference to FIG. 1 or FIG. 9 is connected to the motor 50. For this reason, inrush current can be reduced, and steady power consumption and heat generation can be suppressed. In addition, the air blower 400 using the motor 50 may be an air conditioner or a fan.

  By using the motor 50 to which the inrush current protection circuit is connected, a small circuit with reduced element loss can be configured, and a blower device with reduced power consumption can be realized, contributing to energy saving. In addition, the reliability of the peripheral circuit is improved, and a product with a long life can be realized.

  FIG. 16 is a diagram illustrating an example of a blower 400 configured using the motor 500 illustrated in FIG. 13. The blower 400 is, for example, a ventilation fan.

  In FIG. 16, the blower 400 includes the motor 500 described with reference to FIGS. 13 and 14. The blower 400 includes a panel 401 and a rotary blade 402 provided in the panel 401 and driven by the motor 50. The motor 500 includes the inrush current protection circuit described with reference to FIG. 1 or FIG. For this reason, inrush current can be reduced, and steady power consumption and heat generation can be suppressed. In addition, the air blower 400 using the motor 500 may be an air conditioner or a fan.

  By using the motor 500 with a built-in inrush current protection circuit, a small circuit with reduced element loss can be configured, and a blower with reduced power consumption can be realized, contributing to energy saving. In addition, the reliability of the peripheral circuit is improved, and a product with a long life can be realized.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 rectifier circuit, 2 smoothing capacitor, 3 inrush current suppression element, 4 load, 10 AC power supply, 11, 12, 13, 14 diode, 21, 22 smoothing capacitor, 31, 32 resistor, 50,500 motor, 61,62 Thermistor, 100, 110, 120 Inrush current protection circuit, 200 drive circuit, 201 switching element group, 202 current sensor, 203 control circuit, 300 windings, 400 blower, 401 panel, 402 rotating blade.

Claims (7)

An inrush current protection circuit having an input of an AC voltage of an AC power source connected to a first input terminal and a second input terminal,
A rectifier circuit for rectifying the alternating current of the alternating current power source and outputting it between the first output terminal and the second output terminal;
A first smoothing capacitor and a second smoothing capacitor connected in series to smooth the output of the rectifier circuit;
A first inrush current suppression element having one end connected to the first output terminal and the other end connected to the first smoothing capacitor;
A second inrush current suppression element having one end connected to the second output terminal and the other end connected to the second smoothing capacitor;
With
The connection point between the first smoothing capacitor and the second smoothing capacitor is an inrush current protection circuit connected to either the first input terminal or the second input terminal. The inrush current protection circuit according to claim 1, wherein the first inrush current suppression element and the second inrush current suppression element are resistance elements. 2. The inrush current protection circuit according to claim 1, wherein each of the first inrush current suppression element and the second inrush current suppression element is a thermistor having a characteristic that a resistance value decreases with an increase in temperature. The inrush current protection circuit according to any one of claims 1 to 3, wherein the rectifier circuit includes a diode bridge.   The motor which uses as an input the output voltage of the inrush current protection circuit as described in any one of Claims 1-4.   A motor having the inrush current protection circuit according to any one of claims 1 to 4.   The air blower which has the blade | wing rotated by the motor of Claim 5.

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