JP7030879B2 - Power supply - Google Patents

Description

The present disclosure relates to a power supply that supplies power to a load having a capacitance.

There is a load in which the voltage supply destination and the capacitance are connected in series. When trying to supply a square wave voltage to the voltage supply destination, the voltage applied to the load must be a triangular wave (trapezoidal wave) due to the existence of capacitance. A power supply device that generates such a triangular wave voltage is disclosed in Patent Document 1 and the like.

Japanese Unexamined Patent Publication No. 2002-208842

The load is required to have a relatively large amount of electric power, and the power supply device of Patent Document 1 has a circuit that uses an operational amplifier (power amplifier) to generate a triangular wave voltage of a relatively large amount of electric power. However, there is a problem that a power supply device using an operational amplifier is expensive and has a large power loss.

Therefore, an object of the present invention is to provide a power supply device at a low price and having a small power loss in order to solve the above problems.

In order to achieve the above object, the power supply device according to the present invention does not use an operational amplifier, uses a choke having a large reactor value as a constant current source, and generates a triangular wave voltage by switching by a switch element.

Specifically, the power supply device according to the present invention is a power supply device that supplies an applied voltage to an output terminal to which a load having a load capacitance component in series with a voltage supply destination and a voltage supply destination is connected.
Equipped with a triangular wave generation circuit, bias superimposition circuit and control circuit,
The triangular wave generation circuit is
It is connected to the input end side to which the voltage source is connected and the connection end side to which the bias superimposition circuit is connected, two switch elements, two inductors and one output capacitor are combined, and the voltage across the output capacitor is set to the above. It has a switching circuit that outputs to the connection end, and has a switching circuit.
The bias superimposition circuit is
A constant voltage is superimposed or not superimposed on the voltage across the output capacitor that is connected to the connection end side and the output end side and is output to the connection end of the triangular wave generation circuit, and the output capacitor is switched. It is a circuit configuration that outputs a voltage in which a constant voltage is superimposed on a voltage across both ends or a voltage that is not superimposed on the output end.
The control circuit is
It is characterized in that the bias superimposition circuit is controlled so as to superimpose the constant voltage on the voltage across the output capacitor when the applied voltage is supplied to the voltage supply destination.

This power supply device does not use an operational amplifier, and generates a triangular wave voltage by switching switch elements. Therefore, the present invention can provide a power supply device at a low price and with a small power loss.

The present invention can provide a power supply device at a low cost and with a small power loss.

It is a figure explaining the power supply device which concerns on this invention. It is a figure explaining the power supply device which concerns on this invention. It is a figure explaining the operation of the power supply device which concerns on this invention. It is a figure explaining the operation of the power supply device which concerns on this invention. It is a figure explaining the equivalent circuit of a load. It is a figure explaining the power supply device which concerns on this invention. It is a figure explaining the power supply device which concerns on this invention. It is a figure explaining the power supply device which concerns on this invention.

An embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In addition, the components having the same reference numerals in the present specification and the drawings shall indicate the same components.

(Embodiment 1)
FIG. 1 is a diagram illustrating a power supply device 301 of the present embodiment. The power supply device 301 is a power supply device that supplies an applied voltage to a load 50 to which a voltage supply destination X and a load capacitor C7 are connected in series.
A triangular wave generation circuit 10, a bias superimposition circuit 20, and a control circuit 40 are provided.
The triangular wave generation circuit 10 is
For example, it is connected to the input end T1 side to which a voltage source such as a constant voltage source (DC power supply) V1 is connected and the connection end T2 side to which the bias superimposition circuit 20 is connected, and two switch elements, two inductors and one. It has a switching circuit that combines two output capacitors and outputs the voltage across the output capacitor to the connection end T2.
The bias superimposition circuit 20 is
A constant voltage is superimposed or not superimposed on the voltage across the output capacitor connected to the connection end T2 side and the output end T3 side and output to the connection end T2 of the triangular wave generation circuit 10, and the output capacitor is switched. It is a circuit configuration that outputs a voltage obtained by superimposing a constant voltage on both ends voltage or a voltage not superimposing the voltage on the output terminal T3.
The control circuit 40
It is characterized in that the bias superimposition circuit 20 is controlled so as to superimpose the constant voltage on the voltage across the output capacitor when the applied voltage is supplied to the voltage supply destination X.
It should be noted that not only the constant voltage may be superimposed over the entire period in which the applied voltage is supplied to the voltage supply destination X, but also the constant voltage may be superimposed only in a part of the period in which the applied voltage is supplied to the voltage supply destination X. ..

In the power supply device 301, the time during which the bias superimposing circuit 20 is within the period of the triangular wave (trapezoidal wave) and the voltage value fluctuates uniformly with respect to the voltage of the triangular wave (trapezoidal wave) having a predetermined frequency generated by the triangular wave generation circuit. A constant voltage is superimposed on. By supplying the output voltage of the triangular wave (trapezoidal wave) on which such a constant voltage is superimposed to the load 50, the triangular wave (trapezoidal wave) component of the output voltage is the load capacitor C7, and the constant voltage component is the voltage supply destination X. The voltage is divided into. The load 50 has a load capacitance component (load capacitor C7) in series with respect to the voltage supply destination X.

FIG. 2 is a diagram illustrating a specific circuit configuration of the triangular wave generation circuit 10 and the bias superimposition circuit 20. The triangular wave generation circuit 10 is
The switching path in which two switch elements (SW1 and SW2) are connected in series and the output capacitor C6 are connected in parallel.
Both ends of the input end T1 are connected to both ends of the switching path, respectively.
One of the connections between both ends of the input end T1 and both ends of the switching path is connected by the inductor L1, and the inductor L2 is connected to either of the two switch elements (SW1, SW2). do.
The triangular wave generation circuit 10a in FIG. 2 is an example of the triangular wave generation circuit 10.
A switching path connected to the input end T1 and the connection end T2 and connected in series with two switch elements (SW1 and SW2) on the input end T1 side of the output capacitor C6 is connected in parallel with the output capacitor C6.
An inductor L1 is connected to the input end T1 side of the switching path on the path between the input end T1 and the output end T3.
The inductor L2 is connected in parallel with the switch element SW1 of the switching path.
Further, in the bias superimposition circuit 20, two bias switches (SW3 and SW4) are connected in parallel, a DC power supply V2 that generates a constant voltage is connected in series to the bias switch SW4, and the bias switch SW3 serves as a bypass path. It is a composition.

In FIG. 2, V1 and V2 are DC power supplies, and SW1 to SW4 are switch elements. Here, it will be described as an ideal switch element having no parasitic diode or parasitic capacitance. Further, the load capacitor C7 is a blocking capacitor. The inductors L1 and L2 are choke coils.

By increasing the inductance of the inductor L1 (for example, 10 mH), the ripple current can be suppressed, and the inductor L1 can be regarded as a constant current source. As will be described later, since the current from the inductor L1 flows through the load 50, the ability to limit the ripple current (inductance of the inductor L1) is reflected in the accuracy of the voltage Vx applied to the voltage supply destination X. Further, the inductor L2 is connected and operated so that a current opposite to that of the inductor L1 can be supplied to the load 50 side.

[Operation under constant current load]
When the voltage supply destination X is a constant current load in which a constant current flows regardless of the applied voltage (see FIG. 5A, the current flows at a resistance value of zero on the diode side), the specific operation of the power supply device 301. Will be described with reference to FIG.
FIG. 3 is a diagram illustrating a waveform of a drive signal of each switch element SW (on when there is a signal, that is, a conduction state), a voltage VC7 across the load capacitor _C7 , and a voltage VX applied to the voltage supply destination _X. Is. A drive signal is input from the control circuit 40 to each switch element SW.

In the period a, only the switch element SW1 is turned on and is in a conductive state. At this time, the current of the inductor L1 flows in the order of the inductor L1, the DC power supply V1, the output capacitor C6, and the inductor L1. Since the output capacitor C6 stored in the period h, which will be described later, is discharged, the voltage VC6 across the output capacitor _C6 drops in the period a.

Further, in the period a, since the switch element SW2 is off (when there is no signal, that is, the non-conducting state) and the switch element SW1 is on, a closed circuit in which the inductor L2 is short-circuited by the switch element SW1 is formed.

After the period b, the on / off control of the switch elements SW3 and SW4 is performed. In the case of FIG. 2, the control circuit 40 turns on one of the bias switches (switch element SW4) and switches on the other bias switch (switch element SW3) when a constant voltage is superimposed on the voltage across VC6 of the output capacitor _C6 . It is turned off, and when a constant voltage is not superimposed on the voltage across the output capacitor _C6 , one of the bias switches (switch element SW4) is turned off and the other bias switch (switch element SW3) is turned on.

In the period b, the switch element 4 is turned on. The current of the inductor L1 flows through both the output capacitor C6 and the load 50, and both currents are constant currents. Let Ix be the value of the current flowing through the voltage supply destination X. The current flowing through the voltage supply destination X also flows through the load capacitor C7. Therefore, the voltage across the load capacitor _C7 VC7 changes at a constant rate with time.

Here, the current IL1 of the inductor _L1 is _IL1 = Ix (1 + C _C6 / C _C7 ).
By setting the voltage of the DC power supply V1 so as to be, the slope of the voltage across the output capacitor C6 and the slope of the voltage across the load capacitor C7 (the slope of the time fluctuation of the voltage) becomes the same. Note that CC6 and CC7 represent the capacitances of the output capacitor _C6 and the load capacitor _C7 .

When the switch element SW4 is turned on during this period, the DC power supply V2 is connected in series with the output capacitor C6. Therefore, the sum of the voltage across the output capacitor C6 and the voltage VV2 of the DC power supply _V2 is connected to the output terminal T3. Is output. The voltage at the output terminal T3 is divided between the load capacitor C7 of the load 50 and the voltage supply destination X. Since the voltage across the output capacitor C6 and the voltage across the load capacitor C7 have the same ratio, a voltage determined by the voltage VV2 of the DC power supply _V2 is applied to the voltage supply destination X. That is, the voltage to be applied to the voltage supply destination X can be set by the voltage VV2 of the DC power supply _V2 .

Here, the timing for turning on the switch element SW4 is preferably when the voltage across the output capacitor _C6 , which has decreased in the period a, VC6 becomes substantially the same as the voltage across the load capacitor _C7 . If the voltage across the ends _VC6 and the voltage across the ends _VC7 are substantially the same, the voltage applied to the voltage supply destination X is substantially equal to the voltage of the DC power supply V2, so that the power supply device 301 can be easily set.

Even in the period b, since the switch element SW2 is off and the switch element SW1 is on, a closed circuit in which the inductor L2 is short-circuited by the switch element SW1 is formed.

Subsequently, in the period c, the switch element SW4 is turned off and the switch element SW3 is turned on. At this time, the current of the inductor L1 is the current flowing in the order of the inductor L1, the DC power supply V1, the output capacitor C6, and the inductor L1, the inductor L1, the DC power supply V1, the voltage supply destination X, the load capacitor C7, the switch element SW3, and the inductor. There is a current flowing in the order of L1.

At this time, when a diode is connected in parallel with the switch element SW3 or there is a parasitic diode, it is preferable to turn off both the switch elements SW3 and SW4 at the same time. That is, at the end of superimposing a constant voltage on the voltage across the output capacitor _C6 , one of the bias switches (switch element SW4) is turned off, and then the other bias switch (switch element SW3) is turned on. Previously, a diode (not shown) for passing a current flowing through the bypass path is arranged in parallel with the other bias switch (switch element SW3).

By turning off the switch element SW4, the current flowing through the load 50 flows through the parallel diode or the parasitic diode of the switch element SW3. If the switch element SW3 is turned on during that time, zero volt switching (ZVS) can be performed and the switching loss can be reduced.
On the other hand, it is necessary to switch so that both the switch elements SW3 and SW4 are not turned on at the same time so that the DC power supply V2 is not short-circuited.

Even in the period c, since the switch element SW2 is off and the switch element SW1 is on, a closed circuit in which the inductor L2 is short-circuited by the switch element SW1 is formed.

In the period d, the switch element SW1 is turned off and the switch element SW2 is turned on. In this period, the current of the inductor L2 is the current flowing through the inductor L2, the switch element SW2, the inductor L1, the DC power supply V1, the inductor L2, the inductor L2, the switch element SW2, the output capacitor C6, the current flowing through the inductor L2, and the inductor. There is a current flowing through L2, a switch element SW2, a switch element SW3, a load capacitor C7, a voltage supply destination X, and an inductor L2.

When the switch element SW2 is turned on, the directions of the current flowing through the load 50 and the current flowing through the output capacitor C6 are opposite to the directions of the currents in the periods b and c. When the direction of the current flowing through the load 50 is reversed, the energy stored in the load capacitor C7 is discharged. Here, the inductor L2 has the following effects. Since the inductor L2 is in the path of the current flowing through the load 50, the inductor L2 can prevent the energy stored in the load capacitor C7 from being discharged at once and a large current from flowing in the circuit.
Since the current continues to flow in the load 50 even after the energy stored in the load capacitor C7 is discharged, the energy is stored in the load capacitor C7 in the opposite direction, and the voltage VC7 across the load capacitor _C7 starts to rise.
Further, when the direction of the current flowing through the output capacitor C6 is reversed, energy is stored in the output capacitor _C6 , and the voltage across the output capacitor VC6 rises.

In order to prevent the current path of the inductor L2 from being lost when the switch element SW1 and the switch element SW2 are switched between the conductive and non-conducting states, both switch elements are prevented from being in the non-conducting state at the same time. In order to surely avoid making both switch elements in a non-conducting state at the same time, a diode is inserted in the circuit so that the switching path is not short-circuited even if the switch elements SW1 and SW2 are in the conducting state at the same time.

Specifically, the switching path has two diodes (D5, D6) connected in series to each of the two switch elements (SW1, SW2).
FIG. 2 is characterized in that the diode D6 has an anode on the connection point Tc side, the cathode is connected in series to the switch element SW1, and the diode D5 is connected in series to the switch element SW2 on the connection point Tc side. ..
The control circuit 40
The switch element SW1 is conducted, and the current of the inductor L2 is passed through the switch element SW1 and the diode D6.
The switch element SW2 is conducted, and the current of the inductor L2 is passed through the switch element SW2 and the diode D5 to the output capacitor C6.

The diode D5 is connected so that the current flowing through the inductor L2 flows forward through the diode D5 and flows toward the output end T3 when the switch element SW2 is conducting. Further, the diode D6 is connected so that the current flowing through the inductor L2 forms a closed circuit in which the current flowing through the diode D6 flows in the forward direction when the switch element SW1 is conducted.

By inserting the diodes (D5, D6) in this way, it is possible to prevent short-circuiting of the switching path (diode D5, switch element SW2, diode D6, switch element SW1) even if the switch elements SW1 and SW2 are turned on at the same time. can.

In the period e, the switch element SW3 is turned off, and the connection end T2 and the load 50 are electrically disconnected. In this period, the current of the inductor L2 includes a current flowing through the inductor L2, a switch element SW2, an inductor L1, a DC power supply V1, and an inductor L2, and a current flowing through the inductor L2, the switch element SW2, the output capacitor C6, and the inductor L2. ..

After the period e, the above-mentioned period a is set, but the switch elements SW1 and SW2 are prevented from being in a non-conducting state at the same time even at the transition of this period.

In the switching path, it is preferable that the additional capacitor C5 is connected in parallel to the diode D5. The diode D5 to which the additional capacitor C5 is connected in parallel conducts when the current of the inductor L2 is supplied to the output end T3 side.
Even when the switch element SW2 is off, a current may flow due to the internal capacitance of the diode D5 or the parasitic capacitance of the switch element SW2 (this current is referred to as “leakage current”). In particular, when the current flowing through the internal capacitance of the diode D5 or the parasitic capacitance of the switch element SW2 fluctuates during the period c, the current of the entire circuit fluctuates, and the voltage Vx applied to the voltage supply destination X fluctuates. In order to prevent fluctuations in the voltage Vx, the leakage current should be kept constant. Therefore, the internal capacitance of the diode D5 can be supplemented with an additional capacitor C5 so that the leakage current does not fluctuate.

[Operation under constant resistance load]
When the voltage supply destination X is a constant resistance load having a constant electric resistance regardless of the applied voltage (see FIG. 5B, the resistance value is zero when a current flows to the diode side), the control circuit 40 is always on one side. The bias switch (switch element SW4) is turned off and the other bias switch (switch element SW3) is turned on.
The specific operation of the power supply device 301 will be described with reference to FIG.
FIG. 4 is a diagram illustrating the waveforms of the drive signal of each switch SW (on when there is a signal, that is, the conduction state), the voltage VC7 across the load capacitor _C7 , and the voltage VX applied to the voltage supply destination _X. be. In this embodiment, the switch element SW3 is turned on and the switch element SW4 is turned off (when there is no signal), that is, the non-conducting state is maintained without turning on.

In the period g, the current IL1 flowing through the inductor _L1 which can be regarded as substantially constant is divided into the capacitance ratio between the output capacitor C6 and the load capacitor C7 and flows to the load 50 and the output capacitor C6. Therefore, since a constant current flows through the voltage supply destination X having a constant resistance value, the constant voltage V2 is applied to the voltage supply destination X.

Since the switch element SW2 is off and the switch element SW1 is on during this period, a closed circuit in which the inductor L2 is short-circuited by the switch element SW1 is formed.

Since the switch element SW2 is on and the switch element SW1 is off in the period h, the current flowing through the inductor L2 flows through the load 50 and the output capacitor C6 in the direction opposite to the period g. Here, since the equivalent circuit of the voltage supply destination X is shown in FIG. 5B, the current flows to the diode having almost no resistance during this period, and the constant voltage is not applied to the voltage supply destination X.

In order to prevent the current path of the inductor L2 from being lost when the switch element SW1 and the switch element SW2 are switched between the conductive and non-conducting states, both switch elements are prevented from being in the non-conducting state at the same time. In order to ensure that both switch elements are in a non-conducting state at the same time, diodes (D5, D6) are inserted into the circuit as described in the example of constant current load, and the switching path is set even when the conducting state is reached. Do not short-circuit. At this time, the additional capacitor C5 may be connected in parallel to the diode D5.

When the power supply destination of the power supply device is a constant resistance load, the switch element SW4 is not conducted, so that the switch element SW4 and the DC power supply V2 do not have to be equipped. Further, since the output capacitor C6 is not required, it can be not equipped or the capacity can be reduced.

That is, the power supply circuit 303 as shown in FIG. 7 can be used. The power supply circuit 303 is a power supply device that supplies an applied voltage to an output terminal T3 to which a load 50 having a voltage supply destination X and a load capacitance component C7 in series with the voltage supply destination X is connected.
A triangular wave generation circuit 10c and a control circuit 40 are provided.
The triangular wave generation circuit 10c is
It is connected to the input end T1 side and the output end T3 side to which the voltage source V1 is connected, and has a switching circuit in which two switch elements (SW1, SW2) and two inductors (L1, L2) are combined.
The control circuit 40
A closed circuit is formed in which the inductor L2 is short-circuited by supplying the current flowing through the inductor L1 to the output end T3 side and conducting the switch element SW1, and by conducting the switch element SW2, the current flows through the inductor L2 and flows through the inductor L1. The triangular wave generation circuit 10c is controlled so as to supply a current in the direction opposite to the current to the output end T3 side.

Here, the triangular wave generation circuit 10c is
Having a switching path in which two switch elements (SW1, SW2) are connected in series,
Both ends of the input end T1 are connected to both ends of the switching path, respectively.
One of the connections between both ends of the input end T1 and both ends of the switching path is connected by the inductor L1, and the inductor L2 is connected to either of the two switch elements.

The diodes (D5, D6) and the additional capacitor C5 are the same as those described in the triangular wave generation circuit 10a of FIG. The operation of the triangular wave generation circuit 10c is the same as that described in FIG.

(Variations of circuit configuration)
The circuit configuration shown in FIG. 2 is an example of the present embodiment. For example, the inductor L2 may be connected to the terminal T12 side, the circuit C may be connected to the terminal T32 side, and the connection circuit A and the circuit may be connected. It may have a configuration in which B is replaced. Alternatively, it may be a combination of these.

(Embodiment 2)
FIG. 6 is a diagram illustrating the power supply device 302 of the present embodiment. The power supply device 302 includes a triangular wave generation circuit 10b in which the circuit configuration of the triangular wave generation circuit 10 is different from that of the power supply device 301 of FIG. The triangular wave generation circuit 10 is
A switching path in which an output capacitor C6, an inductor L1 and two switch elements (SW1 and SW2) are connected in series is connected in parallel to the connection end T2 side.
Both ends of the input end T1 are connected to one end of the switching path and the connection point Tc of the two switch elements (SW1, SW2), respectively, and one of the input ends T1 and one end of the switching path are connected or The other of the input terminal T1 and the connection point Tc of the two switch elements are connected by the inductor L2. In the triangular wave generation circuit 10b, the connection point Tc of the two switch elements (SW1 and SW2) of the switching path and the input end T1 are connected by the inductor L2.

The switching control (on / off timing) of the switching elements SW1 to SW4 performed by the control circuit 40 is the same as the control of the first embodiment (same as FIG. 3 or FIG. 4).

Even if the triangular wave generation circuit 10 has the configuration of the triangular wave generation circuit 10b, the power supply device 302 operates like the power supply device 301 of the first embodiment. Further, a diode (D5, D6) or an additional capacitor C5 may be connected.

When the power supply destination of the power supply device is a constant resistance load, the switch element SW4 is not conducted, so that the switch element SW4 and the DC power supply V2 do not have to be equipped. Further, since the output capacitor C6 is not required, it can be not equipped or the capacity can be reduced.

That is, the power supply circuit 304 as shown in FIG. 8 can be used. The power supply device 304 is a power supply device that supplies an applied voltage to an output terminal T3 to which a load 50 having a voltage supply destination X and a load capacitance component C7 in series with the voltage supply destination X is connected.
A triangular wave generation circuit 10d and a control circuit 40 are provided.
The triangular wave generation circuit 10d is
It is connected to the input end T1 side and the output end T3 side to which the voltage source V1 is connected, and has a switching circuit in which two switch elements (SW1, SW2) and two inductors (L1, L2) are combined.
The control circuit 40
A closed circuit is formed in which the inductor L2 is short-circuited by supplying the current flowing through the inductor L1 to the output end T3 side and conducting the switch element SW1, and by conducting the switch element SW2, the current flows through the inductor L2 and flows through the inductor L1. It is characterized in that the triangular wave generation circuit 10c is controlled so as to supply a current in the direction opposite to the current to the output terminal T3 side.

Here, the triangular wave generation circuit 10d is
The inductor L1 and the switching path in which the two switch elements are connected in series are connected in parallel in order from the output end T3 side.
Both ends of the input end T1 are connected to one end of the switching path and the connection point Tc of the two switch elements (SW1, SW2), respectively, and one of the input ends T1 and one end of the switching path are connected or The other of the input terminal T1 and the connection point Tc of the two switch elements are connected by the inductor L2.

The diodes (D5, D6) and the additional capacitor C5 are the same as those described in the triangular wave generation circuit 10a of FIG. The operation of the triangular wave generation circuit 10d is the same as that described in FIG.

(Variations of circuit configuration)
The circuit configuration shown in the circuit configuration shown in FIG. 6 is an example of the present embodiment. For example, the inductor L2 may be connected to the terminal T12 side, and the circuit C may be connected to the terminal T32 side. The circuit A and the circuit B may be interchanged. Alternatively, it may be a combination of these.

In the power supply device described in the first and second embodiments, the switch element SW1 is made conductive to form a closed circuit in which the inductor L2 is short-circuited by the switch element SW1 and the inductor L1 is used in both the constant current load and the constant resistance load. The common operation is to supply the flowing current to the output end T3 side, conduct the switch element SW2, and supply the current opposite to the current flowing through the inductor L1 flowing through the inductor L2 to the output end T3 side.

The power supply device (301, 302) uses a choke (L1) having a large reactor value as a constant current source to generate a triangular wave voltage by switching. The power supply device (301, 302) is compatible with a constant current load and a constant resistance load, and can generate a trapezoidal wave voltage at a lower cost and lower loss than a power supply device composed of an operational amplifier.

The power supply device according to the embodiment of the present invention has been described mainly with reference to FIGS. 1 to 8 as an example, but the configuration, structure, number, arrangement, shape, material, etc. of each part are limited to the above specific examples. However, those appropriately selected by those skilled in the art are also included in the scope of the present invention as long as the gist of the present invention is included.

10, 10a, 10b: Triangle wave generation circuit 20: Bias superimposition circuit 50: Load 301, 302: Power supply device

Claims (13)

A power supply device that supplies an applied voltage to an output end to which a load having a load capacitance component in series with a voltage supply destination and the voltage supply destination is connected.
Equipped with a triangular wave generation circuit, bias superimposition circuit and control circuit,
The triangular wave generation circuit is
It is connected to the input end side to which the voltage source is connected and the connection end side to which the bias superimposition circuit is connected, two switch elements, two inductors and one output capacitor are combined, and the voltage across the output capacitor is set to the above. It has a switching circuit that outputs to the connection end, and has a switching circuit.
The bias superimposition circuit is
A constant voltage is superimposed or not superimposed on the voltage across the output capacitor that is connected to the connection end side and the output end side and is output to the connection end of the triangular wave generation circuit, and the output capacitor is switched. It is a circuit configuration that outputs a voltage in which a constant voltage is superimposed on a voltage across both ends or a voltage that is not superimposed on the output end.
The control circuit is
A power supply device comprising controlling the bias superimposition circuit so as to superimpose the constant voltage on the voltage across the output capacitor when the applied voltage is supplied to the voltage supply destination. The triangular wave generation circuit is
The switching path in which the two switch elements are connected in series and the output capacitor are connected in parallel.
Both ends of the input end are connected to both ends of the switching path, respectively.
One of the connections between both ends of the input end and both ends of the switching path is connected to one of the two inductors, and the other of the two inductors is connected to either of the two switch elements. The power supply device according to claim 1. The triangular wave generation circuit is
A switching path connecting the output capacitor, one of the two inductors, and the two switch elements in series is connected in parallel to the connection end side.
Both ends of the input end are connected to one end of the switching path and the connection point of the two switch elements, respectively, and one of the input ends is connected to one end of the switching path, or the other of the input ends. The power supply device according to claim 1, wherein the connection between the two and the connection point of the two switch elements is connected to the other of the two inductors. The switching path has two diodes connected in series to each of the two switch elements.
The control circuit is
One of the two switch elements is conducted, and the current of the other of the two inductors is passed through one of the two switch elements and one of the two diodes.
A claim characterized in that the other of the two switch elements is conducted and the current of the other of the two inductors is passed through the other of the two switch elements and the other of the two diodes to the output capacitor. Item 2. The power supply device according to Item 2. The power supply device according to claim 4, wherein the switching path has an additional capacitor connected in parallel to the other of the two diodes. When the bias superimposition circuit superimposes the constant voltage on the voltage across the output capacitor,
The constant voltage is the voltage applied to the voltage supply destination, and is
The power supply device according to any one of claims 1 to 5, wherein the voltage change rate of the voltage waveform generated at both ends of the load capacitance component is adjusted by the voltage of the voltage source input to the input end. .. The bias superimposition circuit is
The circuit configuration is such that two bias switches are arranged in parallel, a DC power supply that generates the constant voltage is connected in series to one of the bias switches, and the other of the two bias switches serves as a bypass path.
According to the instruction from the control circuit, when a constant voltage is superimposed on the voltage across the output capacitor, one of the two bias switches is in a conductive state and the other of the two bias switches is in a non-conducting state. When a constant voltage is not superimposed on the voltage across the ends, one of the two bias switches is in a non-conducting state and the other of the two bias switches is in a conducting state.
At the end of superimposing a constant voltage on the voltage across the output capacitor, the bypass path is set after one of the two bias switches is made non-conducting and before the other of the two bias switches is made conducting. The power supply device according to any one of claims 1 to 6, wherein a diode through which a flowing current is passed is arranged in parallel with the other bias switch. The bias superimposition circuit is
The circuit configuration is such that two bias switches are arranged in parallel, a DC power supply that generates the constant voltage is connected in series to one of the two bias switches, and the other of the two bias switches serves as a bypass path.
The power supply according to any one of claims 1 to 5, wherein one of the two bias switches is always in a non-conducting state and the other of the two bias switches is in a conducting state according to an instruction from the control circuit. Device. A power supply device that supplies an applied voltage to an output end to which a load having a load capacitance component in series with a voltage supply destination and the voltage supply destination is connected.
Equipped with a triangular wave generation circuit and a control circuit
The triangular wave generation circuit is
It is connected to the input end side to which the voltage source is connected and the output end side, and has a switching circuit in which two switch elements and two inductors are combined.
The control circuit is
By supplying the current flowing through one of the two inductors to the output end side and conducting one of the two switch elements, a closed circuit in which the other of the two inductors is short-circuited is formed, and the two switch elements are formed. By conducting the other of the two inductors, the triangular wave generation circuit is controlled so as to supply the current flowing in the other of the two inductors in the direction opposite to the current flowing in one of the two inductors to the output end side. Characterized power supply. The triangular wave generation circuit is
Having a switching path in which the two switch elements are connected in series,
Both ends of the input end are connected to both ends of the switching path, respectively.
One of the connections between both ends of the input end and both ends of the switching path is connected to one of the two inductors, and the other of the two inductors is connected to either of the two switch elements. The power supply device according to claim 9. The triangular wave generation circuit is
One of the two inductors and a switching path connecting the two switch elements in series are connected in parallel to the output end side.
Both ends of the input end are connected to one end of the switching path and the connection point of the two switch elements, respectively, and one of the input ends is connected to one end of the switching path, or the other of the input ends. The power supply device according to claim 9, wherein the connection between the two and the connection point of the two switch elements is connected to the other of the two inductors. The switching path has two diodes connected in series to each of the two switch elements.
The control circuit is
One of the two switch elements is conducted, and the current of the other of the two inductors is passed through one of the two switch elements and one of the two diodes.
It is characterized in that it conducts the other of the two switch elements and supplies the current of the other of the two inductors to the output end side via the other of the two switch elements and the other of the two diodes. The power supply device according to claim 10 or 11. The power supply device according to claim 12, wherein the switching path has an additional capacitor connected in parallel to the other of the two diodes.

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