JP7558533B2 - Switching regulator, power supply circuit and method - Google Patents

Description

The present disclosure relates to a switching regulator, a power supply circuit, and a method.

Patent document 1 discloses that in a DC-DC converter, a timing circuit controls the on/off of two sampling switches (S0, S1) to reduce power consumption by a resistive voltage divider (R0, R1).

Patent No. 5864438

However, in the above-mentioned DC-DC converter, even if the power consumption by the resistive voltage divider (R0, R1) can be reduced, the power consumption by the timing circuit itself remains. In other words, even if the switch is controlled by a control circuit such as a timing circuit, power for the control is still required.
The present disclosure has been made in consideration of such problems, and has an object to provide a switching regulator, a power supply circuit, and a method that are capable of further reducing power consumption.

A switching regulator according to one aspect of the present disclosure has a fixed electrode, a movable electrode that is elastically supported by an elastic support and faces the fixed electrode, and a connection part that connects or disconnects a power line in response to the movement of the movable electrode, and an electret is formed on at least one of the fixed electrode and the movable electrode, and the electrostatic attraction by the electret is changed to connect or disconnect the power line of the connection part.

According to one aspect of the present disclosure, a power supply circuit that converts AC voltage to DC voltage and supplies the DC voltage to an external load includes a capacitor connected in parallel to the external load and the switching regulator connected in parallel to the capacitor, and the switching regulator controls the on/off state of the power supply line for supplying the DC voltage.

According to one aspect of the present disclosure, a method for converting an AC voltage into a DC voltage and supplying it to an external load includes a capacitor connected in parallel to the external load, and a switching regulator connected in parallel to the capacitor, the switching regulator having a fixed electrode, a movable electrode elastically supported by an elastic support portion and facing the fixed electrode, and a connection portion that connects or disconnects a power line depending on the operation of the movable electrode, and in a power supply circuit in which an electret is formed on at least one of the fixed electrode and the movable electrode, the electrostatic attraction force due to the electret and the elastic force due to the elastic support portion are equal and balanced based on a position where the electrostatic attraction force is greater than the elastic force and the fixed electrode and the movable electrode are close to each other, the connection portion connects the power line, and the electrostatic attraction force is smaller than the elastic force and the fixed electrode and the movable electrode are separated from each other, the connection portion disconnects the power line.

In addition, a control method for a switching regulator according to one aspect of the present disclosure includes a switching regulator having a fixed electrode, a movable electrode that is elastically supported by an elastic support portion and faces the fixed electrode, and a connection portion that connects or disconnects a power line depending on the operation of the movable electrode, and in which an electret is formed on at least one of the fixed electrode and the movable electrode, the electrostatic attraction by the electret is changed to connect or disconnect the power line of the connection portion.

This disclosure provides a switching regulator, a power supply circuit, and a method that can further reduce power consumption.

1 is a schematic configuration diagram of a power supply circuit according to an embodiment; FIG. 2 is a diagram illustrating an operation of a power supply circuit according to an embodiment. FIG. 2 is a diagram illustrating an operation of a power supply circuit according to an embodiment. 1 is a schematic configuration diagram of a power supply circuit according to an embodiment; 1 is a schematic configuration diagram of a power supply circuit according to an embodiment; 1 is a schematic configuration diagram of a power supply circuit according to an embodiment; 1 is a schematic configuration diagram of a power supply circuit according to an embodiment; FIG. 1 is a schematic diagram of a conventional power supply circuit. 1 is a schematic configuration diagram of a switching regulator according to an embodiment; 1 is a schematic configuration diagram of a switching regulator according to an embodiment;

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the attached drawings. The same elements are designated by the same reference numerals throughout this specification and the attached drawings, and duplicated descriptions will be omitted.

(PRIOR ART)
FIG. 8 is a schematic diagram of a conventional power supply circuit.

The power supply circuit 800 has a switching regulator 801, a capacitor 802, an external load 803, an AC power supply 804, and a rectifier circuit 805.

The switching regulator (hereinafter also simply referred to as regulator) 801 includes a control circuit 810 and a switch 811, and the control circuit 810 monitors the charging voltage of the capacitor 802 and controls the on/off state of the switch 811.

When the charging voltage of the capacitor 802 is less than a predetermined value, the control circuit 810 turns on the switch 811, and the current flowing from the AC power source 804 through the rectifier circuit 805 flows to the capacitor 802 and the external load 803. In addition, an electric charge is accumulated in the capacitor 802.

On the other hand, when the charging voltage of the capacitor 802 reaches or exceeds a predetermined value, the control circuit 810 turns off the switch 811. When the switch 811 turns off, no current flows from the AC power supply 804, but a current flows from the capacitor 802 to the external load 803.
Next, when the charging voltage of the capacitor 802 drops below a predetermined value, the control circuit 810 turns on the switch 811, and a current from the AC power supply 804 begins to flow.
In this way, the switching regulator 801 of the power supply circuit 800 controls the on/off state of the switch 811 in accordance with the charging voltage of the capacitor 802, thereby stabilizing the voltage supplied to the external load 803 within a range that does not exceed a predetermined voltage value.

However, the conventional switching regulator 801 requires a DC power supply for the control circuit 810 to monitor the charging voltage of the capacitor 802 and control the switch 811 based on the charging voltage. It is known that a drive current of 200 nA to 500 nA is required to drive the control circuit of a typical switching regulator.

First Embodiment
1 is a schematic diagram of a power supply circuit 100 according to an embodiment of the present invention. The power supply circuit 100 converts an AC voltage into a DC voltage and supplies the DC voltage to an external load.

The power supply circuit 100 according to this embodiment includes a switching regulator 101, a capacitor 102, an external load 103, an AC power supply 104, and a rectifier circuit 105.

The AC power source 104 may be a power generating element, for example, a vibration power generating element. The rectifier circuit 105 may be a diode bridge circuit that full-wave rectifies the AC voltage supplied from the AC power source 104. The capacitor 102 may be a capacitor connected in parallel to the external load 103 between the rectifier circuit 105 and the external load 103.

The switching regulator 101 controls and stabilizes the voltage applied from the AC power source 104 to the external load 103 via the rectifier circuit 105. For example, the switching regulator 101 controls the output voltage from the rectifier circuit 105 to the external load 103 so that it does not exceed a predetermined voltage value.

The switching regulator 101 includes a fixed part 110, a movable part 111 facing the fixed part 110, and a connection part 112. The connection part 112 provided on the movable part 111 is arranged in series with the capacitor 102, and connects or disconnects the power line. An electret is formed on at least one of the movable part 111, which is a movable electrode, and the fixed part 110, which is a fixed electrode. For example, a potassium ion electret can be used as the electret. In addition, the movable part 111 is elastically supported by an elastic support part (not shown). Normally, the electrostatic attraction caused by the electret between the movable part 111 and the fixed part 110 is greater than the elastic force of the elastic support part that elastically supports the movable part 111 (electrostatic attraction force>elastic force of the elastic support part), and the connection part 112 that connects the high potential side terminal and the low potential side terminal of the power line is closed (i.e., on state), and current flows. As shown in the figure, the connection part 112 passes between the high potential terminal and the low potential terminal of the power line, and connects to the high potential terminal and the low potential terminal so as to cover the movable part 111 from the opposite side of the power line. In this way, the switching regulator 101 is normally closed.

On the other hand, when the charging voltage of the capacitor 102 becomes larger than a predetermined value, the charging voltage cancels the charge of the electret, so that the electrostatic attraction decreases and the electrostatic attraction becomes smaller than the elastic force of the elastic support part ((electrostatic attraction) < (elastic force of the elastic support part)). Therefore, the elastic force of the elastic support part causes the movable part 111 to move away from the fixed part 110, and at the same time, the connection part 112 moves away from the high potential terminal and the low potential terminal of the power line (i.e., the OFF state). Therefore, no current flows from the rectifier circuit 105. In the OFF state, current flows from the capacitor 102 to the external load 103, and the charging voltage decreases. As the charging voltage decreases, the electrostatic attraction increases, so that the movable part 111 approaches the fixed part 110 again, and the connection part 112 is closed again (i.e., the ON state).

In this way, the fixed part 110 and the movable part 111 operate as an actuator connected in parallel to the capacitor 102, and control the on/off state of the connection part 112, which is a switch. That is, the switching regulator 101 connects or disconnects the power line of the connection part 112 by changing the electrostatic attraction caused by the electret formed on at least one of the movable part 111 and the fixed part 110.

The switching regulator 101 according to this embodiment combines the functions of a voltage sensor that monitors the charging voltage of the capacitor 102 and a switch that controls the on/off state of the circuit, eliminating the need for a power supply to monitor the charging voltage and control the switch as in conventional power supply circuits. Furthermore, since there is no need for a control circuit to operate a conventional switching regulator and no need for a drive current of 200 nA to 500 nA to drive the control circuit, the operating current of the switching regulator can be brought as close to 0 nA as possible, reducing the power consumption of the power supply circuit.

Next, the operation of the power supply circuit 200 according to one embodiment will be described with reference to Figures 2 and 3. Figure 2 shows the power supply circuit 200 in an on state, and Figure 3 shows the power supply circuit 200 in an off state.

The power supply circuit 200 has a switching regulator 201, a capacitor 202, an external load 203, an AC power supply 204, and a rectifier circuit 205, and has the same configuration as the power supply circuit 100 in FIG. 1. That is, the switching regulator 201, the capacitor 202, the external load 203, the AC power supply 204, and the rectifier circuit 205 of the power supply circuit 200 correspond to the switching regulator 101, the capacitor 102, the external load 103, the AC power supply 104, and the rectifier circuit 105 of the power supply circuit 100, respectively.

The switching regulator 201 includes a fixed part 210, a movable part 211, and a connection part 212. In FIG. 2, the fixed part 210 and the movable part 211 are close to each other, the electrostatic attraction by the electret between the fixed part 210 and the movable part 211 is greater than the elastic force of the elastic support part (not shown) of the movable part 211 (electrostatic attraction force > elastic force of the elastic support part), and the connection part 212 is in contact with the high potential side terminal and the low potential side terminal. Therefore, the connection part 212 is in the ON state, and the output current from the rectifier circuit 205 flows through the connection part 212 to the capacitor 202, the external load 203, and the movable part 211. The arrows in the figure indicate the direction of current flow.

The connection part 212 maintains the on state (i.e., normally closed) when the charging voltage of the capacitor 202 is equal to or lower than a predetermined value. The predetermined value can be, for example, 5 V.

Figure 3 shows the power supply circuit 200 in the off state.

When the charging voltage of the capacitor 202 exceeds a predetermined voltage and the electrostatic attraction of the electret decreases, based on the position where the electrostatic force of the electret and the elastic force of the elastic support part (not shown) are balanced, the elastic force of the elastic support part (not shown) becomes relatively larger (electrostatic attraction < elastic force of the elastic support part). Therefore, the movable part 211 is separated from the fixed part 210 by the elastic force of the elastic support part, and accordingly, the connection part 212 is also separated from the high potential terminal and the low potential terminal, entering the OFF state.

When regulator 201 is in the OFF state, current flows from capacitor 202 to external load 203 (in the direction of the arrow in the figure), and the charging voltage of capacitor 202 decreases. Therefore, when the charging voltage of capacitor 202 again drops below a predetermined voltage value, the electrostatic attraction of the electret increases, moving part 211 approaches fixed part 210, connecting part 212 closes, and the ON state is entered.

In this way, the regulator 201 according to this embodiment can stabilize the voltage applied to the external load 203 so that it does not exceed a predetermined voltage value. Furthermore, the regulator 201 can realize the functions and methods of a voltage sensor that monitors the charging voltage and a switch that controls the on/off state of the circuit, without requiring any other power source.

Second Embodiment
4 and 5 are schematic diagrams of a power supply circuit 400 according to another embodiment. Fig. 4 shows the power supply circuit 400 in an on state, and Fig. 5 shows the power supply circuit 400 in an off state.

The power supply circuit 400 has a switching regulator 401, a capacitor 402, an external load 403, an AC power supply 404, and a rectifier circuit 405. The power supply circuit 400 differs from the power supply circuit 200 described above in the configuration of the switching regulator 401, but the other configurations are the same as those of the power supply circuit 200 described above.

The regulator 401 includes a movable part 410, fixed parts 411 and 412, and fixed connection parts 414 and 416, and the power line is conductive when the movable contact 413 of the movable part 410 comes into contact with the fixed contacts 415 and 417 of the fixed connection parts 414 and 416. The operation of the movable part 410 is similar to that of the power supply circuit 200 described above. That is, the movable part 410 operates according to the relationship between the electrostatic attraction force due to the electret formed on at least one of the movable part 410 and the fixed parts 411 and 412, and the elastic force of the elastic support part (not shown) of the movable part 410, and the contact/non-contact (on/off state) between the movable contact 413 and the fixed contacts 415 and 417 is controlled.

The movable contact 413 and the fixed contacts 415, 417 may be formed of a low-wear metal thin film. The metal thin film may be formed of, for example, Ru, Pb, or Au. The fixed contact 415 is also referred to as the high-potential side fixed contact of the power line, and the fixed contact 417 is also referred to as the low-potential side fixed contact of the power line.

Figure 5 shows the power supply circuit 400 in the off state. The operation of the movable part 410 is the same as that of the power supply circuit 200 described above. That is, the charging voltage of the capacitor 402 exceeds a predetermined voltage value, the electrostatic attraction of the electret decreases, and the elastic force of the elastic support part (not shown) of the movable part 410 becomes relatively large, so that the movable part 410 moves away from the fixed parts 411 and 412, and the movable contact 413 moves away from the fixed contacts 415 and 417.

In this way, the regulator 401 can form a switch using the movable contact 413 of the movable part 410 and the fixed contacts 415, 417 of the fixed connection parts 414, 416.

Third Embodiment
6 and 7 are schematic diagrams of a power supply circuit 600 according to yet another embodiment. Fig. 6 shows the power supply circuit 600 in an on state, and Fig. 7 shows the power supply circuit 600 in an off state.

The power supply circuit 600 has a switching regulator 601, a capacitor 602, an external load 603, an AC power supply 604, and a rectifier circuit 605. The power supply circuit 600 differs from the power supply circuits 200 and 400 described above in the configuration of the switching regulator 601, but the other configurations are the same as those of the power supply circuits 200 and 400 described above.

Regulator 601 includes movable part 610, fixed parts 611, 612, fixed connection part 613, and cantilever 615, and the power line is conductive when low potential side contact 616 (i.e., movable contact) on cantilever 615 comes into contact with high potential side contact 614 (i.e., fixed contact) of fixed connection part 613. While regulators 201, 401 of power supply circuits 200, 400 described above both have two contact points, regulator 601 can control the on/off state with only one contact point. This improves the reliability and durability of the switch.

In the above description, the fixed connection part 613 is provided at the high potential end of the power line, and the cantilever 615 is provided at the low potential end of the power line, but this is not limited to the above. In other words, it is sufficient that the fixed connection part 613 is provided at one end of the power line, and the cantilever 615 is provided at the other end of the power line.

The operation of the movable part 610 is the same as that of the power supply circuits 200 and 400 described above. That is, the movable part 610 operates according to the relationship between the electrostatic attraction force due to the electret formed on at least one of the movable part 610 and the fixed parts 611 and 612 and the elastic force of the elastic support part (not shown) of the movable part 610, and the contact/non-contact (on/off state) between the high potential side contact 614 and the low potential side contact 616 is controlled.

Figure 7 shows the power supply circuit 600 in the off state. The operation of the movable part 610 is the same as that of the power supply circuits 200 and 400 described above. That is, the charging voltage of the capacitor 602 exceeds a predetermined voltage value, the electrostatic attraction of the electret decreases, and the elastic force of the elastic support part (not shown) of the movable part 610 becomes relatively large, so that the movable part 610 moves away from the fixed parts 611 and 612, and further, the movable part 610 moves away from the cantilever 615, and the low potential side contact 616 moves away from the high potential side contact 614.

(Detailed configuration of the switching regulator)
9A and 9B are schematic diagrams of a switching regulator 900 according to an embodiment of the present invention, in which FIG. 9A shows the ON state and FIG. 9B shows the OFF state.

The switching regulator 900 has a handle layer 901, a joint portion 902, a fixed portion 903, a movable portion 904, and an elastic support portion 905. A power supply line (not shown) is electrically connected by contact between a movable contact 906 of the movable portion 904 and a fixed contact 907. In addition, a plurality of comb-tooth electrodes are formed so as to mesh with each other on the surface where the fixed portion 903 and the movable portion 904 face each other, and an electret potential is applied to at least some of the plurality of comb-tooth electrodes.

The switching regulator 900 in FIG. 9(a) is in a state in which the electrostatic attraction force (in the direction of arrow A) due to the electret formed on at least one of the fixed part 903 and the movable part 904 is greater than the elastic force (in the direction of arrow B) of the elastic support part 905. In this state, the movable part 904 is close to the fixed part 903, and the movable contact 906 and the fixed contact 907 are in contact (normally closed).

The switching regulator 900 in FIG. 9(b) is in a state in which the elastic force (arrow B direction) of the elastic support part 905 is relatively large because the electrostatic attraction (arrow A direction) caused by the electret formed on at least one of the fixed part 903 and the movable part 904 is reduced by the charging voltage of the capacitor (not shown). In this state, the movable part 904 is pulled in the arrow B direction by the elastic support part 905 and moves away from the fixed part 903, causing the movable contact 906 and the fixed contact 907 to be out of contact.

In other words, the electret voltage applied to at least one of the fixed part 903 and the movable part 904 is designed so that the electrostatic attraction force (direction of arrow A) is greater than the elastic force (direction of arrow B).

In this way, by realizing a normally closed state with an actuator structure including a fixed part 903 and a movable part 904, at least one of which has an electret formed on it, it has become possible to implement a switch in a switching regulator. In other words, if it is not a normally closed switch, charging of the capacitor will not start and the power supply circuit will not function.

Figure 10 is a schematic diagram of a switching regulator 1000 according to another embodiment. Figure 10(a) shows the on state, and Figure 10(b) shows the off state.

The switching regulator 1000 has a handle layer 1001, a joint portion 1002, a fixed portion 1003, a movable portion 1004, and an elastic support portion 1005. The operation of the movable portion 1004 brings a switch contact electrode 1006 provided on the cantilever 1008 into contact with an opposing switch contact electrode 1007, thereby establishing electrical continuity in the power supply line.

The switching regulator 1000 differs from the switching regulator 900 in FIG. 9 in that, instead of the movable contact 906 and the fixed contact 907, it has a switch contact electrode 1006 and an opposing switch contact electrode 1007 provided on the cantilever 1008, but the rest of the configuration is the same as that of the switching regulator 900.

In FIG. 9(a), the fixed part 1003 and the movable part 1004 are in close proximity, and the movable part 1004 brings the switch contact electrode 1006 on the cantilever 1008 into contact with the opposing switch contact electrode 1007. In FIG. 9(b), the fixed part 1003 and the movable part 1004 are farther apart, and the switch contact electrode 1006 on the cantilever 1008 is not in contact with the opposing switch contact electrode 1007. The operating principle of the movable part 1004 is the same as that of the movable part 904 described with reference to FIG. 9.

The switching regulator 1000 can control the on/off state with only one contact, improving the reliability and durability of the switch.

The above-described embodiment provides the following advantages:

(1) It is possible to reduce power consumption by monitoring the charging voltage of the capacitor and eliminating the need for a large drive voltage to control the switch.

(2) Because switching can be performed at low voltage, there is no need for electromagnetic noise countermeasures, which were previously required because the magnetic field generated by the current occurs in sync with the switching cycle.

(3) By reducing the number of connection points for the switch, the reliability and durability of the switch can be improved.

REFERENCE SIGNS LIST 100 Power supply circuit 101 Switching regulator 102 Capacitor 103 External load 104 AC power supply 105 Rectifier circuit 110 Fixed part 111 Movable part 112 Connection part

Claims (14)

A fixed electrode;
a movable electrode that is elastically supported by an elastic support portion and faces the fixed electrode;
a connection portion that connects or disconnects a power supply line in response to an operation of the movable electrode;
An electret is formed on at least one of the fixed electrode and the movable electrode,
By changing the electrostatic attraction by the electret, the power supply line of the connection part is connected or disconnected ;
A switching regulator, wherein the connection portion is configured to pass between the high potential side terminal and the low potential side terminal of the power supply line and to cover the movable electrode side from the opposite side across the power supply line in order to connect to the high potential side terminal and the low potential side terminal of the power supply line . A fixed electrode;
a movable electrode that is elastically supported by an elastic support portion and faces the fixed electrode;
a connection part that connects or disconnects a power supply line in response to the movement of the movable electrode;
having
An electret is formed on at least one of the fixed electrode and the movable electrode,
By changing the electrostatic attraction by the electret, the power supply line of the connection part is connected or disconnected;
A switching regulator, wherein the connection portion includes a fixed contact provided at one end of the power supply line and a movable contact on a cantilever provided at the other end of the power supply line, and the fixed contact and the movable contact are configured to be in contact with each other. when the electrostatic attractive force is greater than the elastic force based on a position where the electrostatic attractive force and the elastic force of the elastic support portion are equal and balanced, the fixed electrode and the movable electrode come close to each other, and the connection portion connects the power supply line;
3. The switching regulator according to claim 1, wherein when the electrostatic force is smaller than the elastic force, the fixed electrode and the movable electrode are separated from each other, causing the connection portion to disconnect the power supply line. 4. The switching regulator according to claim 1, wherein a plurality of comb-tooth electrodes are formed in mesh with each other on opposing surfaces of the fixed electrode and the movable electrode. A power supply circuit that converts AC voltage into DC voltage and supplies the DC voltage to an external load,
A capacitor connected in parallel to the external load;
a switching regulator according to any one of claims 1 to 4 connected in parallel to the capacitor;
The switching regulator is a power supply circuit that controls the on/off state of the power supply line for supplying the DC voltage. 6. The power supply circuit according to claim 5 , wherein the switching regulator is in an on state when a charging voltage of the capacitor is equal to or lower than a predetermined value, and is in an off state when the charging voltage of the capacitor is greater than the predetermined value. 7. The power supply circuit according to claim 5 , further comprising a rectifier circuit for full-wave rectifying the AC voltage. 8. The power supply circuit according to claim 7 , wherein the rectifier circuit is a diode bridge circuit. The power supply circuit according to claim 5 , wherein the AC voltage is supplied by a power generating element. The power supply circuit according to claim 9 , wherein the power generating element is a vibration power generating element. A method for converting an AC voltage into a DC voltage and supplying the DC voltage to an external load, comprising the steps of:
A capacitor connected in parallel to the external load;
a switching regulator connected in parallel to the capacitor, the switching regulator having a fixed electrode, a movable electrode elastically supported by an elastic support and facing the fixed electrode, and a connection part that connects or disconnects a power supply line in response to an operation of the movable electrode;
In a power supply circuit in which an electret is formed on at least one of the fixed electrode and the movable electrode,
the electrostatic attraction force by the electret and the elastic force by the elastic support portion are equal and based on a balanced position, the electrostatic attraction force is greater than the elastic force, and the fixed electrode and the movable electrode are close to each other, whereby the connection portion connects the power supply line;
the electrostatic attraction force is smaller than the elastic force, and the fixed electrode and the movable electrode are separated from each other, so that the connection portion disconnects the power supply line;
A method in which the connection portion is configured to pass between the high potential side terminal and the low potential side terminal of the power supply line and to cover the movable electrode side from the opposite side across the power supply line in order to connect to the high potential side terminal and the low potential side terminal of the power supply line . A method for converting an AC voltage into a DC voltage and supplying the DC voltage to an external load, comprising the steps of:
A capacitor connected in parallel to the external load;
a switching regulator connected in parallel to the capacitor, the switching regulator having a fixed electrode, a movable electrode elastically supported by an elastic support and facing the fixed electrode, and a connection part that connects or disconnects a power supply line in response to an operation of the movable electrode;
In a power supply circuit in which an electret is formed on at least one of the fixed electrode and the movable electrode,
the electrostatic attraction force by the electret and the elastic force by the elastic support portion are equal and based on a balanced position, the electrostatic attraction force is greater than the elastic force, and the fixed electrode and the movable electrode are close to each other, whereby the connection portion connects the power supply line;
the electrostatic attraction force is smaller than the elastic force, and the fixed electrode and the movable electrode are separated from each other, so that the connection portion disconnects the power supply line;
The method of claim 1, wherein the connection portion includes a fixed contact provided at one end of the power line and a movable contact on a cantilever provided at the other end of the power line, and the fixed contact and the movable contact are configured to be in contact with each other. A fixed electrode;
a movable electrode that is elastically supported by an elastic support portion and faces the fixed electrode;
a connection portion that connects or disconnects a power supply line in response to an operation of the movable electrode;
In a switching regulator in which an electret is formed on at least one of the fixed electrode and the movable electrode,
A method for connecting or disconnecting the power supply line of the connection portion by changing the electrostatic attraction by the electret, comprising :
A method in which the connection portion is configured to pass between the high potential side terminal and the low potential side terminal of the power supply line and to cover the movable electrode side from the opposite side across the power supply line in order to connect to the high potential side terminal and the low potential side terminal of the power supply line . A fixed electrode;
a movable electrode that is elastically supported by an elastic support portion and faces the fixed electrode;
a connection part that connects or disconnects a power supply line in response to the movement of the movable electrode;
having
In a switching regulator in which an electret is formed on at least one of the fixed electrode and the movable electrode,
A method for connecting or disconnecting the power supply line of the connection portion by changing the electrostatic attraction by the electret, comprising:
The method of claim 1, wherein the connection portion includes a fixed contact provided at one end of the power line and a movable contact on a cantilever provided at the other end of the power line, and the fixed contact and the movable contact are configured to be in contact with each other .

Images