WO2007086286A1

WO2007086286A1 - Power supply device

Info

Publication number: WO2007086286A1
Application number: PCT/JP2007/050566
Authority: WO
Inventors: Toru Ikeda; Tamiji Nagai
Original assignee: Mitsumi Electric Co., Ltd.; Nagai, Toshio
Priority date: 2006-01-26
Filing date: 2007-01-17
Publication date: 2007-08-02
Also published as: JP2007202305A

Abstract

Provided is a power supply device capable of supplying a stable output for fluctuation of an input voltage or fluctuation of a load in a power supply device of the capacitor division type. A plurality of capacitors (C1, C2) are connected between terminals to which AC voltage is inputted. The power supply device generates an output voltage (Vout) from voltages of the both electrodes of one capacitor (C2) among the plurality of capacitors. The power supply device includes a rectification element (D1) for limiting the charge direction of the plurality of capacitors (C1, C2) to one direction, a switch (S1) for discharging electric charge from the capacitor (C1), and a control circuit (12) for turning ON/OFF the switch (S1) according to the output voltage.

Description

Specification

Power supply

Technical field

The present invention relates to a power supply device that divides an input voltage by a capacitor to generate an output voltage.

Background art

Conventionally, there is a power supply circuit which receives an AC voltage such as AC 100 V or AC 200 V and divides the AC voltage with a capacitor to generate a DC voltage such as 3.3 V to 9 V. For example, an input capacitor and an output capacitor are connected in series between the input terminals of the alternating voltage, and the divided alternating voltage generated between the electrodes of the output capacitor is rectified by a diode bridge and output. Configured

Disclosure of the invention

Problem that invention tries to solve

In the conventional capacitor division type power supply circuit, the output power is determined to some extent by the frequency of the AC voltage and the capacitance ratio of the input capacitor and the output capacitor, so that the load fluctuates or the peak voltage of the input voltage Fluctuation may cause the output voltage to jump temporarily or drop temporarily.

[0004] An object of the present invention is to provide a power supply apparatus capable of obtaining a stable output against fluctuations in input voltage and fluctuations in load in a capacitor division type power supply apparatus.

Means to solve the problem

[0005] In order to achieve the above object, according to the present invention, a plurality of capacitors (CI, C2) are connected between terminals to which a first voltage (Vin) of alternating current or pulsating current is inputted. What is claimed is: 1. A power supply device (10) generating an output voltage from a voltage across a portion of a capacitor (C2), the discharging means capable of discharging the charge stored in one or more of the plurality of capacitors. (S1) and a control circuit (12) for on / off controlling the discharge action of the discharge means. According to such a power supply device, the amount of discharge of the capacitor is changed by the discharging means, thereby changing the amount of current that can be sent to the input side power output side in each cycle of the input voltage. Can do. Therefore, by controlling this amount of current, it is possible to stabilize the output against load fluctuation and fluctuation of input voltage.

Specifically, the control circuit includes a detection circuit (11) for detecting the output voltage, and the control circuit is configured to control the discharging unit based on an output of the detection circuit. Further, the control circuit is configured to determine the timing of turning on / off the discharge means in accordance with the phase of the first voltage (Vin). Further, a rectifying element (D 1) is connected which restricts the charging direction of one or more capacitors among the plurality of capacitors in one direction. The discharging means may be constituted by a switch (S1) for electrically connecting or disconnecting one terminal of one or more of the plurality of capacitors to the other connection point.

In the power supply device of the present invention, at least a first capacitance circuit (C1) and a second capacitance circuit (C2) are connected in series between input terminals of an alternating voltage (Vin), and A power supply (10) for generating an output voltage from voltages at both ends, the rectifying element (D1) connected between the first capacitance circuit and the second capacitance circuit, and the first capacitance circuit A switch (S1) for electrically connecting or disconnecting the output terminal of the switch to another connection point, a detection circuit (11) for detecting the output voltage, and a switch (S1) based on the output of the detection circuit And a control circuit (12) for performing on-Z off control. Specifically, the switch (S1) is connected between the output-side terminal of the first capacitance circuit (C1) and one input terminal of the AC voltage (Vin).

According to such a power supply apparatus, in addition to the above-described effects and effects, the number of circuit elements is reduced to a simple configuration, and the control of switches is also simplified.

Further, the power supply device (10A: FIG. 4) of the present invention comprises a plurality of rectifying elements (Dl l, D12, D15, D16) connected in a form for full-wave rectifying an AC voltage, and a plurality of these A first capacitance circuit (C11) provided on a path for flowing current when the alternating voltage is a positive voltage between the rectifying elements, and a current when the alternating voltage is negative between the plurality of rectifying elements And a third capacitance circuit (C13) connected between the terminals from which the voltage full-wave rectified by the plurality of rectifying elements is output. First capacitance circuit and And a switch (S11) for electrically connecting or disconnecting one end of the second capacitance circuit to another connection point, and a control circuit for performing on / off control of the switch, the voltage across the three capacitance circuit To generate an output voltage.

Specifically, the switch (S11) is configured to be connected between the output side terminals of the first capacitance circuit and the second capacitance circuit and one terminal of the third capacitance circuit. Between the switch and the first capacitance circuit, and a rectifying element (D13, D14) for flowing discharge current from the first capacitance circuit and the second capacitance circuit between the switch and the second capacitance circuit. It is good.

[0012] With such a configuration, voltage can be output by supplying current to the third capacitance circuit using both the period in which the AC voltage is positive and the period in which the AC voltage is negative. It can.

In the power supply device (10B: FIG. 8) of the present invention, at least a first capacitance circuit (C21) and a second capacitance circuit (C22) are connected in series between the input terminals of the AC voltage (Vin). A power supply device for generating an output voltage from the voltage across the second capacitance circuit, the discharging means (S21, D23) capable of discharging the first capacitance circuit to the second capacitance circuit; And a control circuit (12) for on-off control of the means.

Specifically, the discharge means is provided with a rectifying element (D21, D22) that allows current to flow only in the first direction to the first capacitance circuit and the second capacitance circuit between the input terminals of the AC voltage. A first current path and a rectifying element for causing current to flow in the direction opposite to the first direction with respect to the first capacitance circuit and in the same direction with respect to the second capacitance circuit with respect to the second capacitance circuit (D23 And a switch (S21) for conducting Z-disconnection of the first current path.

More specifically, the first diode (D21), the first capacitance circuit (C21), the second diode (D22), and the second capacitance circuit (C22) are sequentially arranged between the input terminals of the AC voltage (Vin). The switch (S21) is connected in series between the connection point of the first diode and the first capacitance circuit and the connection point of the second diode and the second capacitance circuit, and the first capacitance is connected. A third diode (D23) is connected between a connection point between the circuit and the second diode and the terminal on the input terminal side of the second capacitance circuit, and the first diode and the second diode are connected. A rectifying element for flowing current only in the first direction is constituted, and the switch, the second capacitance A path in which the path, the third diode, and the first capacitance circuit are connected in series constitutes the first current path, and the third diode regulates the flow direction of the current in the first current path. Is to be configured.

According to such a means, in addition to the ability to stabilize the output against load fluctuations and fluctuations in input voltage, the first capacitive circuit is discharged by switch control and the second capacitance Since the second capacitance circuit is charged by being input to the circuit, it is possible to reduce the loss due to the discharge of the first capacitance circuit.

[0017] In this item, the reference numerals representing the correspondence with the embodiment are shown in parentheses, but this is added as a reference for ease of understanding, and the present invention is not limited thereto. It is not a thing.

Effect of the invention

As described above, according to the present invention, in a capacitor division type power supply device in which an input voltage is divided by a capacitor to generate an output voltage, the output is stabilized against load fluctuations and variations in input voltage. It has the effect of being able to

Brief description of the drawings

FIG. 1 is a block diagram showing a power supply apparatus according to a first embodiment of the present invention.

FIG. 2 is a waveform chart showing an example of the operation of the power supply device of the first embodiment.

[FIG. 3] A graph comparing the output characteristics of the power supply device of the first embodiment and the power supply circuit of the conventional capacitor division system, (a) is an output characteristic graph of the power supply device of the first embodiment, These are the output characteristic graphs of the conventional capacitor division type power supply circuit.

(4) It is a block diagram which shows the power supply device of 2nd Embodiment of this invention.

[FIG. 5] An explanatory view showing a current path of each state of the power supply device of the second embodiment.

[FIG. 6] A waveform diagram for explaining the operation in each state of FIG.

FIG. 7 is a waveform chart showing an example of the operation of the power supply device of the second embodiment.

FIG. 8 is a block diagram showing a power supply device according to a third embodiment of the present invention.

[FIG. 9] An explanatory view showing a current path of each state in the power supply device of the third embodiment.

FIG. 10 is a waveform diagram for explaining the operation of the power supply device of the third embodiment.

Explanation of sign 10, 10A, 10B power supply

11 Detection circuit

12 Control circuit

30 AC power supply

31 load circuit

CI, C2 capacitor

D1 diode

C11 to C13 capacitors

D11 to D16 diodes

C21, C22 capacitor

D21 to D23 diodes

SI, Sl l, S21 switch

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described based on the drawings.

First Embodiment

FIG. 1 is a configuration diagram of a power supply device according to a first embodiment of the present invention.

The power supply device 10 of this embodiment generates a DC output voltage Vout from an AC power supply 30 according to a capacitor division system and outputs it to a load circuit 31. The power supply device 10 includes a first capacitor Cl, a first diode D1, a second capacitor C2, and a switch S1 for flowing a discharge current of the first capacitor C1, which are sequentially connected in series between the input terminals of the AC power supply 30. A detection circuit 11 for detecting the output voltage Vout and a control circuit 12 for controlling on / off of the switch S 1 based on the output of the detection circuit 11 are also configured. Then, the voltage between both electrodes of the second capacitor C2 is output as the output voltage Vout.

The above-mentioned first diode D1 is connected in a direction in which current flows from the first capacitor C1 to the side of the second capacitor C2.

For example, according to the relationship between the input voltage Vin and the output voltage Vout, a capacitor with a small capacity is applied to the first capacitor C1, and an electrolytic capacitor with a large capacity is applied to the second capacitor C2. Depending on the output voltage Vout and the size of the output load, these first and second The type and capacity ratio of the capacitors CI and C2 can be changed as appropriate.

[0026] The switch S1 connects the terminal on the output side of the first capacitor C1 to the other input terminal of the AC power supply 30, for example, with the AC power supply 30 side as the input side and the load circuit 31 side as the output side. Connect to For example, a MOSFET can be applied as the switch S1. In addition, bipolar transistors and various switch elements may be used! ,.

The detection circuit 11 converts the output voltage Vout into a detection voltage by, for example, a dividing resistor and outputs the detection voltage to the control circuit 12.

The control circuit 12 controls the timing and the length of time that the switch S1 is turned on based on the detected voltage. Although not shown, a signal representing the timing when the voltage of the AC power supply 30 has a predetermined phase is input to the control circuit 12, and from this signal, the switch S is switched to correspond to the voltage phase of the AC power supply 30. Configure to determine the on period of one.

Next, the operation principle of the power supply device 10 configured as described above will be described.

First, the operation in the case where the switch S1 is not turned on will be described. In the initial state where the first and second capacitors CI and C2 are not charged, as the input voltage Vin rises to 0V power as well to the peak voltage, the first capacitor Cl, the diode D1 and the second capacitor C2 are sent accordingly. The current flows to charge the first capacitor C1 and the second capacitor C2. Then, a voltage Vout is generated between the electrodes of the second capacitor C2, and a current is output to the load circuit 31.

Subsequently, when the input voltage Vin falls from the peak voltage, no charge is discharged from the first capacitor C1 due to the rectifying action of the diode D1, and the first capacitor C1 remains fully charged. Therefore, in this state, when the input voltage Vin rises from 0 V to the peak voltage again, no current flows through the first capacitor Cl, the diode D1 and the second capacitor C2 because the first capacitor C1 is fully charged. That is, the supply of current from the AC power supply 30 to the second capacitor C2 is cut off. Therefore, if a current is output from the second capacitor C2 to the load circuit 31 in this state, the output voltage Vout gradually decreases, and then the output current also stops.

Next, an operation in the case where the switch S1 is subjected to the on-Z off control will be described. As described above, when the switch S1 is turned on when the input voltage Vin is lower than the peak voltage in a state where the first capacitor C1 is fully charged, the first capacitor C1 is switched via the switch S1. The force discharge current flows and the charge amount of the first capacitor decreases.

Then, when the input voltage Vin rises again to the OV power peak voltage while the charge amount of the first capacitor C1 decreases, the first capacitor Cl and the diode are fully charged until the first capacitor C1 is fully charged. A current flows from D1 to the second capacitor C2, and a current is supplied from the AC power supply 30 to the second capacitor C2. As a result, the output voltage Vout rises, and the current output to the load circuit 31 is also continued.

That is, since the switch S1 is turned on to discharge the first capacitor C1, current can be supplied from the AC power supply 30 to the second capacitor C2 during the next charging period. Furthermore, the amount of discharge of the first capacitor C1 can be changed by changing the phase timing and the time length for turning on the switch S1, so that the amount of current supplied to the second capacitor C2 can be controlled. It can.

[0035] FIG. 2 shows an example of the operation waveform of the power supply device 10 of FIG. The first half shows the operation waveform with the control pattern when the output load is large, and the second half shows the operation waveform with the control pattern when the output load is small.

The control circuit 12 performs control of a period during which the switch S1 is turned on within a range where the input voltage Vin also has a peak voltage of 0 V as shown by the S1-GATE voltage in FIG. In FIG. 2, switch SI is turned on when the SI-- GATE voltage is high. Then, when the output load becomes large and the detected value of the output voltage Vout becomes low, the period for turning on the switch S1 is shifted to the side where the input voltage Vin force S0V. Conversely, if the output load force and the detected value of the output voltage Vout become higher, the period in which the switch S1 is turned on is shifted to the side where the input voltage Vin becomes the peak voltage.

By such control, as shown in the operation waveform in the first half of FIG. 2, when the output load is large, switch S1 is driven on when the input voltage Vin is low, and the first capacitor Many discharges of C1 are performed. As a result, a large amount of current is supplied to the second capacitor C2 during the next charging period to cope with a large output load.

On the other hand, as shown in the operation waveform in the second half of FIG. 2, when the output load is small, the input voltage Vin is high !, and when the switch S1 is driven on, the discharge of the first capacitor C1 is performed. Is done less. And by that amount, less current in the second capacitor C2 during the next charging period Can be supplied to handle small output loads.

The operation waveforms in FIG. 2 show the waveforms when the load circuit 31 is executed with the same load resistance connected, and therefore, there are two kinds of control patterns: large output and small output. Although the magnitude of the output voltage Vout is different, by controlling based on the detection of the output voltage Vout, the output voltage Vout can be maintained at a substantially constant value.

FIG. 3 shows a graph comparing the output characteristics of the power supply device 10 of the first embodiment and a conventional capacitor division type power supply circuit.

As shown in FIG. 3 (b), in the conventional capacitor division type power supply circuit, the magnitude of the output power is substantially determined by the capacitance ratio of the division capacitors, so load fluctuation and input voltage The peak fluctuation of the output voltage Vout significantly fluctuates.

On the other hand, in the power supply device 10 of this embodiment, as shown in FIG. 3 (a), the load current can be changed while keeping the output voltage Vout constant. Even if there is a peak voltage fluctuation, the output voltage Vout can be stabilized.

In this embodiment, a control period in which the switch S1 is turned on is within a range where the input voltage Vin drops to 0 V as well, for example, a range where the input voltage Vin is 0 V or less is included. It is good. In addition, the length of time for turning on the switch S1 may not be short and constant, for example, it may be kept on until the phase timing at which the input voltage Vin becomes a peak voltage and the off timing is controlled. It is also possible to change the discharge amount of the first capacitor C1 by changing the time length for turning on S1.

Although the voltage of the AC power supply 30 is directly input as the input voltage Vin, the same operation can be obtained by inputting the voltage of the pulsating current after being rectified by the rectification circuit.

Second Embodiment

FIG. 4 is a block diagram showing a power supply apparatus 10A according to a second embodiment of the present invention, FIG. 5 is an explanatory view showing current paths in each state of the power supply apparatus 10A, and FIG. It is the wave form diagram which showed the operation waveform.

The power supply device 10A of the second embodiment enables charging and discharging of the capacitor using a full wave portion (both portions where the input voltage Vin is a positive voltage and a negative voltage) of the AC power supply 30. With things is there.

Therefore, the power supply device 10A performs full-wave rectification of the AC power supply 30, for example, first and second diodes Dl l, D12 and fifth and sixth diodes connected in the same connection configuration as the diode bridge. D15, D16, a first capacitor C11 and a second capacitor C12 connected between these diodes, and a third capacitor C13 connected between the output terminals when viewed as a diode bridge, a first capacitor C11 and a second 2) A switch S11 for discharging the capacitor C12, and diodes D13 and D14 for causing current to flow in the discharge direction of the first capacitor C11 and the second capacitor C12 when the switch S11 is on, are provided. The inter-electrode voltage of the third capacitor C13 is output as an output voltage Vout.

Further, although not shown, a detection circuit 11 and a control circuit 12 are also provided to the power supply device 10A as in the first embodiment.

The first capacitor C11 is provided on a current path through which current flows when the input voltage Vin is a positive voltage among the connection paths of the diodes Dl l, D12, D15, D16, and the second capacitor C12 is The current path is provided on a current path through which current flows when the input voltage Vin is a negative voltage.

Next, the operation principle of the power supply device 10A will be described.

[0051] In the initial state in which the first and second capacitors Cl l, C12 are not charged, first,

When the input voltage Vin becomes a positive voltage V, as shown in FIG. 5 (a), the first capacitor C1 is

+

1. A current flows in the path of the diode D12 through the diode D15, the third capacitor C13, and the ground to charge the first capacitor C11 and the third capacitor C13. Here, no voltage is applied to the second capacitor C12.

Subsequently, when the input voltage Vin becomes a negative voltage V, as shown in FIG. 5 (b), a path of the diode D11 through the second capacitor C12, the diode D16, the third capacitor C13, and the ground. Current flows to charge the second capacitor C12 and the third capacitor C13. Here, no voltage is applied to the first capacitor C11.

By charging the third capacitor C13 in this way, the output voltage Vout can be supplied from the third capacitor C13 to the load circuit.

Here, while switch S 11 is in the off state, as shown in FIGS. 5 (a) and 5 (b), the input voltage Vin is shifted. If it moves, as shown in Figures 6 (a) and 6 (b), the first capacitor C11 and the second capacitor C12 will be fully charged at the first oscillation of the input voltage Vin, and then will not be discharged. The input current from the AC power supply 30 is zero, and the current supply to the third capacitor C13 is also cut off. Therefore, the output voltage Vout gradually decreases, and then the output current also stops.

On the other hand, when the input voltage Vin is a positive voltage and the switch S11 is on-controlled, as shown in FIG. 5 (c), the first capacitor Cl l, the diode D15, the third capacitor C13, and the ground are A current flows through the path of the diode D14 and the second capacitor C12, and as shown in FIG. 6 (c), the second capacitor C12 is discharged. At this time, as shown in FIG. 6 (d), an input current flows from the AC power supply 30 and is supplied to the third capacitor C13.

Also, when the switch S11 is turned on when the input voltage Vin is a negative voltage, a current flows in the same way in the upper and lower symmetrical path, and the first capacitor C11 is discharged, and the third The current is supplied to the capacitor C13.

Then, the amount of discharge of the first capacitor C11 and the second capacitor C12 is changed by changing the phase timing at which the switch S11 is turned on to supply the AC power supply 30 to the third capacitor C13. It is possible to control the amount of current flow.

FIG. 7 shows an example of operation waveforms of the power supply device 10A of the second embodiment. The operation waveform by the control pattern when the output load is large is shown in the first half, and the operation waveform by the control pattern when the output load is small V is shown in the second half.

The control circuit 12 performs control to shift the phase timing for turning on the switch S11 according to the output load, as indicated by the SLl-GATE voltage in FIG. 7. That is, when the output load increases and the detected value of the output voltage Vout decreases, the period in which the switch S11 is turned on is shifted to the side where the input voltage Vin becomes a positive or negative peak voltage. On the other hand, when the output load decreases and the detected value of the output voltage Vout becomes high, the period in which the switch S11 is turned on is shifted to the side where the input voltage Vin becomes the force.

By such control, as shown in the operation waveform in the first half of FIG. 7, when the output load is large, switch S11 is driven on when input voltage Vin is close to the positive and negative peak voltage. As a result, when the input current from the AC power supply 30 is large, the large output load is used. It can respond.

On the other hand, as shown in the operation waveform in the second half of FIG. 7, when the output load is small, the switch S11 is driven on when the input voltage Vin is close to 0 V, whereby the AC power supply 30 As the input current is reduced, small output loads can be accommodated.

The operation waveforms in FIG. 7 show waveforms when two control patterns are executed with the same load resistance connected as a load, so the output voltage Vout is obtained in the first half and the second half. The output voltage Vout can be maintained at a substantially constant value by performing control based on detection of the force output voltage Vout having different magnitudes of.

According to the power supply device 10A of the second embodiment, the output voltage Vout can be stabilized against load fluctuation and peak fluctuation of the input voltage, and the full-wave portion of the AC power supply 30 is used. There is an advantage that the current can be supplied.

Third Embodiment

FIG. 8 is a block diagram showing a power supply 10B according to a third embodiment of the present invention, FIG. 9 is an explanatory view showing a current path in the power supply 10B, and FIG. 10 is an operation waveform diagram of the power supply 10B. .

The power supply device 10 B of the third embodiment is intended to reduce the loss due to discharge by supplying the discharge current of the capacitor under switch control to another capacitor.

A power supply device 10 B according to the third embodiment includes a first diode D 21, a first capacitor C 21, a second diode D 22, a second capacitor C 22, and a first diode D 21 serially connected in series between input terminals of an AC power supply 30. A switch S21 for discharging the capacitor C21 and a third diode D23 for limiting the direction of the discharge current are provided. In addition, a detection circuit 11 for detecting the output voltage Vout and a control circuit 12 for performing on / off control of the switch S 21 based on the output of the detection circuit 11 are provided. Is output to the load circuit 31 as an output voltage Vout.

The first and second diodes D21 and D22 described above are connected in a direction (first direction) in which current flows when the input voltage Vin is a positive voltage.

The switch S21 and the third diode D23 are connected in such a manner that current flows in the path and direction connected to the first capacitor C21, the switch S21, the second capacitor C22, and the third diode D23 in this order. It will be continued. Furthermore, in this current path, the current flows in the direction opposite to the above first direction with respect to the first capacitor C21, and in the same direction as the above first direction with respect to the second capacitor C22. Be done.

In such a power supply device 10B, when the input voltage Vin rises to the peak voltage with the switch S21 turned off, a current flows as shown in FIG. 9 (a), and the first capacitor C21 and Charge the second capacitor C22. Then, the current is output from the second capacitor C22 to the load circuit 31.

If the input voltage Vin reaches the peak voltage and the first capacitor C21 is fully charged, then the first capacitor C21 is not discharged, as long as no current flows from the AC power supply 30 to the first capacitor C21. Since the current is not sent, the supply of current from the AC power supply 30 to the second capacitor C22 is also stopped.

As shown in FIG. 10, the control circuit 12 performs on-control of the switch S21 with a discharge range in which the input voltage Vin becomes lower than the output voltage Vout (for example, the phase when the input voltage Vin becomes a negative voltage). . If it is turned on at any other phase, the input voltage Vin is directly output to the output terminal through the first diode D21.

When the switch S21 is turned on within this discharge range, the first capacitor C21 discharges the second capacitor C22 through the current path shown in FIG. 9 (b). In this discharge path, the charge discharged from the first capacitor C21 moves to the second capacitor C22 to charge the second capacitor C22.

Then, after discharging, when the input voltage Vin rises to the peak voltage again, the input voltage Vin rises to 0 V and the peak voltage (charging range in FIG. 10). A current flows in C21 and the first capacitor C21 is charged again. Then, this current is also supplied to the second capacitor C22.

Further, the discharge amount of the first capacitor C21 is changed by lengthening or shortening the on period of the switch S21 within the discharge range, whereby the AC power supply 30 supplies the second capacitor C22. By controlling the amount of current that is output, the output voltage Vout can be stabilized even if there is load fluctuation or peak fluctuation of the input voltage.

According to the power supply device 10B of the third embodiment configured as described above, the first capacitor C21 is It is also possible to reduce the loss due to the discharge of

Industrial applicability

The present invention can be used, for example, in a power supply device that generates a power supply voltage for an IC such as an AC power supply. In addition, it can be used as a power supply device that supplies power supply voltage to various electronic circuits and electronic devices.

Claims

The scope of the claims

[1] A power supply device in which a plurality of capacitors are connected between terminals to which a first voltage of alternating current or pulsating current is input, and an output voltage is generated from the voltage across some of the plurality of capacitors. And

Discharge means capable of discharging the charge stored in one or more capacitors among the plurality of capacitors;

A control circuit that performs on / off control of the discharge action of the discharge means;

A power supply apparatus comprising:

[2] A detection circuit for detecting the output voltage is provided,

The power supply device according to claim 1, wherein the control circuit controls the discharge means based on an output of the detection circuit.

[3] The discharge according to claim 1 or 2, wherein the control circuit determines the timing of turning on / off the discharge means in accordance with the phase of the first voltage. Source device.

[4] The rectifier according to any one of claims 1 to 3, characterized in that a rectifying element for limiting the charging direction of one or more of the plurality of capacitors in one direction is provided. Power supply device described in.

[5] The discharge means is characterized by comprising a switch electrically connecting or disconnecting one terminal of one or more of the plurality of capacitors to another connection point. The power supply device according to any one of items 1 to 4.

[6] A power supply device in which at least a first capacitance circuit and a second capacitance circuit are connected in series between input terminals of alternating voltage, and a voltage power output voltage is generated across the second capacitance circuit. A rectifying element connected between a capacitance circuit and the second capacitance circuit, and a switch electrically connecting or disconnecting the terminal on the output side of the first capacitance circuit to another connection point;

A detection circuit that detects the output voltage;

A control circuit for performing on / off control of the switch based on an output of the detection circuit.

[7] The power supply device according to claim 6, wherein the switch is connected between the output-side terminal of the first capacitance circuit and one of the input terminals of the AC voltage. .

[8] A plurality of rectifying elements connected in a form for full-wave rectifying AC voltage;

A first capacitance circuit provided on a path through which current flows when the alternating voltage is a positive voltage among the plurality of rectifying elements;

A second capacitance circuit provided on a path through which current flows when the alternating voltage is negative between the plurality of rectifying elements;

A third capacitance circuit connected between terminals to which a voltage full-wave rectified by the plurality of rectifying elements is output;

A switch electrically connecting or disconnecting one end of the first capacitance circuit and one end of the second capacitance circuit to another connection point;

A control circuit for performing on / off control of the switch;

A power supply apparatus characterized by generating an output voltage at both ends of the three capacitance circuit.

[9] The switch is connected between terminals on the output side of the first capacitance circuit and the second capacitance circuit and one terminal of the third capacitance circuit.

Between the switch and the first capacitance circuit and between the switch and the second capacitance circuit, there are respectively provided rectifying elements for causing discharge currents from the first capacitance circuit and the second capacitance circuit to flow. The power supply device according to claim 8, which is assumed to be.

[10] A power supply device in which at least a first capacitance circuit and a second capacitance circuit are connected in series between input terminals of alternating voltage, and a voltage cut-off output voltage is generated across the second capacitance circuit, A discharge means capable of discharging the first capacity circuit to the second capacity circuit; a control circuit for performing on-z-off control of the discharge means;

Power supply device characterized by having!

[11] A rectifying element that allows current to flow only in the first direction to the first capacitance circuit and the second capacitance circuit between input terminals of the alternating voltage,

The discharge means is

With respect to the first capacitance circuit, the second capacitance circuit is opposed to the second capacitance circuit in the direction opposite to the first direction. Then, a first current path and a rectifying element for causing a current to flow in the same direction as the first direction, and a switch for conducting and Z-disconnecting the first current path,

The power supply according to claim 10, wherein the force is also configured.

[12] A first diode, a first capacitance circuit, a second diode, and a second capacitance circuit are connected in series in order between the AC voltage input terminals,

The switch is connected between a connection point of the first diode and the first capacitance circuit and a connection point of the second diode and the second capacitance circuit,

A third diode is connected between a connection point between the first capacitance circuit and the second diode and a terminal on the input terminal side of the second capacitance circuit.

The first diode and the second diode constitute a rectifying element that allows current to flow only in the first direction,

A path in which the switch, the second capacitance circuit, the third diode, and the first capacitance circuit are connected in series constitutes the first current path.

12. The power supply device according to claim 11, wherein the third diode constitutes the rectifying element that regulates the flow direction of the current in the first current path.

[13] A detection circuit for detecting the output voltage is provided,

The control circuit performs on / off control of the switch on the basis of the output of the detection circuit, The control circuit according to any one of claims 8, 9, 11 and 12, characterized in that Power supply.

[14] The control circuit determines the timing for turning on / off the switch in accordance with the phase of the alternating voltage, the sixth to tenth, twelfth, tenth, and twelfth aspects of the present invention. The power supply device according to any one of items 13.