Analog switch bistable voltage switching circuit

Abstract

The utility model relates to the technical field of voltage switching, and the utility model relates to a kind of analog switch bistable voltage switching circuit, comprising: first path action signal input, first relay's action coil, second relay's action coil and the action coil of third relay are connected to the first input port of first analog switch after being connected in turn;First path reset signal input, first relay's reset coil, second relay's reset coil and the reset coil of third relay are connected to the second input port of first analog switch after being connected in turn;And control circuit.Analog switch bistable voltage switching circuit using the utility model can effectively save the internal space of power control device and the cost of power control device.

Description

Technical Field

[0001] This utility model relates to the field of voltage switching technology. More specifically, this utility model relates to an analog switch bistable voltage switching circuit. Background Technology

[0002] The voltage of a power system is generally divided into three types: measurement circuit voltage, protection circuit voltage, and metering circuit voltage. The power system framework generally adopts a single busbar segmentation scheme or a double busbar backup scheme. Regardless of the scheme, it will involve the switching of voltage circuits.

[0003] In existing technologies, power control devices are typically used to provide outputs for system switching of voltage loops. The operating circuits and reset circuits of the same group of relays in the power control device are generally controlled by independent circuits, resulting in complex circuit connections and cumbersome control logic. Each control circuit uses the same components for sampling and control, leading to too many control circuits and components in the control device, which in turn occupies too much internal space and increases the cost of the control device. Utility Model Content

[0004] To address the technical problems of excessive internal space occupation and high cost of existing power control devices, this utility model provides solutions in the following aspects.

[0005] In a first aspect, the present invention provides an analog switching bistable voltage switching circuit, comprising:

[0006] The first action signal input terminal is connected in series with the action coils of the first relay, the second relay, and the third relay, and then connected to the first input port of the first analog switch to control the action of the first relay, the second relay, and the third relay.

[0007] The first reset signal input terminal is connected in series with the reset coils of the first relay, the second relay, and the third relay, and then connected to the second input port of the first analog switch to control the reset of the first relay, the second relay, and the third relay.

[0008] The contacts of the first relay are connected in series between the first A-phase voltage output terminal and the first A-phase voltage receiving terminal to control the on / off state between the first A-phase voltage output terminal and the first A-phase voltage receiving terminal.

[0009] The contacts of the second relay are connected in series between the first phase B voltage output terminal and the first phase B voltage receiving terminal to control the on / off state between the first phase B voltage output terminal and the first phase B voltage receiving terminal.

[0010] The contacts of the third relay are connected in series between the first C-phase voltage output terminal and the first C-phase voltage receiving terminal to control the on / off state between the first C-phase voltage output terminal and the first C-phase voltage receiving terminal.

[0011] The output port of the first analog switch is grounded;

[0012] The control circuit is connected to the channel address selection terminal of the first analog switch and is used to switch the connection status between the output port of the first analog switch and each input port of the first analog switch.

[0013] Preferably, it further includes:

[0014] The second action signal input terminal is connected in series with the action coils of the fourth relay, the fifth relay, and the sixth relay, and then connected to the third input port of the first analog switch to control the action of the fourth relay, the fifth relay, and the sixth relay.

[0015] The second reset signal input terminal is connected in series with the reset coils of the fourth relay, the fifth relay, and the sixth relay, and then connected to the fourth input port of the first analog switch to control the reset of the fourth, fifth, and sixth relays.

[0016] The contacts of the fourth relay are connected in series between the second phase A voltage output terminal and the second phase A voltage receiving terminal to control the on / off state between the second phase A voltage output terminal and the second phase A voltage receiving terminal.

[0017] The contacts of the fifth relay are connected in series between the second phase B voltage output terminal and the second phase B voltage receiving terminal to control the on / off state between the second phase B voltage output terminal and the second phase B voltage receiving terminal.

[0018] The contacts of the sixth relay are connected in series between the second C-phase voltage output terminal and the second C-phase voltage receiving terminal to control the on / off state between the second C-phase voltage output terminal and the second C-phase voltage receiving terminal.

[0019] Preferably, a first voltage divider branch is connected in series between the first action signal input terminal and the action coil of the first relay; a second voltage divider branch is connected in series between the first reset signal input terminal and the reset coil of the first relay; a third voltage divider branch is connected in series between the second action signal input terminal and the action coil of the fourth relay; and a fourth voltage divider branch is connected in series between the second reset signal input terminal and the reset coil of the fourth relay. Each voltage divider branch includes two voltage divider resistors connected in series.

[0020] Preferably, the connection point of the first voltage divider branch to the operating coil of the first relay is grounded through a first filter capacitor, the connection point of the second voltage divider branch to the reset coil of the first relay is grounded through a second filter capacitor, the connection point of the third voltage divider branch to the operating coil of the fourth relay is grounded through a third filter capacitor, and the connection point of the fourth voltage divider branch to the reset coil of the fourth relay is grounded through a fourth filter capacitor.

[0021] Preferably, the first action signal input terminal, the first reset signal input terminal, the second action signal input terminal, and the second reset signal input terminal are all grounded through transient suppression diodes.

[0022] Preferably, the fourth input port of the first analog switch is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded after being connected in series with a third grounding resistor; the second input port of the first analog switch is connected to the cathode of the second Zener diode, and the anode of the second Zener diode is grounded after being connected in series with a fourth grounding resistor.

[0023] Preferably, the control circuit includes:

[0024] The third optocoupler has its primary side first end connected to the output port of the first analog switch and its second end grounded. The secondary side first end of the third optocoupler is connected to the first IO pin of the CPU controller and its secondary side second end is grounded. It is used to acquire the first action signal, the first reset signal, the second action signal, or the second reset signal.

[0025] The first optocoupler has a primary side with its first end grounded and its second end connected to the second IO pin of the CPU controller. One end of its secondary side is connected to the power supply voltage output terminal through a pull-up resistor, and the other end is connected to the first channel address selection terminal of the first analog switch. It is used to send logic control signals to the first analog switch under the control of the CPU controller.

[0026] The second optocoupler has its primary side grounded at one end and connected to the third I / O pin of the CPU controller at the other end. One end of its secondary side is connected to the power supply voltage output terminal through a pull-up resistor, and the other end is connected to the second channel address selection terminal of the first analog switch. It is used to send logic control signals to the first analog switch under the control of the CPU controller.

[0027] Preferably, the first terminal of the secondary side of the third optocoupler is also connected to the first power supply voltage output terminal through a pull-up resistor; the second terminal of the primary side of the first optocoupler is also grounded through a first grounding resistor; and the second terminal of the primary side of the second optocoupler is also grounded through a second grounding resistor.

[0028] Preferably, a current-limiting resistor is connected in series between the first end of the primary side of the third optocoupler and the output port of the first analog switch.

[0029] Preferably, a diode is connected in parallel to the primary side of the third optocoupler, wherein the anode of the diode is connected to the first end of the primary side of the third optocoupler, and the cathode of the diode is connected to the second end of the primary side of the third optocoupler.

[0030] The beneficial effects of this invention are as follows: The analog switch bistable voltage switching circuit of this invention no longer requires two independent drive circuits to control the operation and reset of the relays. Instead, it connects the operating coils and reset coils of multiple relays in series and uniformly connects them to different input ports of the analog switch, avoiding independent wiring for each relay and simplifying the circuit structure. Furthermore, by introducing a combination of analog switch and control circuit, the bistable switching function is achieved. Only one circuit is needed to control the operation and reset of the relays in real time, resulting in high circuit integration and effectively saving internal space and cost of the control device. Moreover, by utilizing the channel address selection function of the analog switch, it is possible to flexibly switch between the operating signal and the reset signal, thereby achieving synchronous operation and reset of multiple relays. Finally, the relay contacts control the on / off state of the three-phase voltages respectively, ensuring the consistency and stability of the three-phase voltage switching and avoiding abnormalities caused by single-phase delays or failures. Attached Figure Description

[0031] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0032] Figure 1 This is a schematic diagram illustrating the structure of an analog switch bistable voltage switching circuit according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram illustrating the circuit principle of an analog switch bistable voltage switching circuit according to an embodiment of the present invention. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0035] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0036] Example of an analog switch bistable voltage switching circuit:

[0037] like Figure 1 and Figure 2 As shown, the analog switch bistable voltage switching circuit of this utility model includes:

[0038] The first action signal input terminal DZ1 is connected in series with the action coils of the first relay K11, the second relay K12, and the third relay K13, and then connected to the first input port of the first analog switch SW1 to control the action of the first relay, the second relay, and the third relay.

[0039] The first reset signal input terminal, FW1, is connected in series with the reset coils of the first relay, the second relay, and the third relay, and then connected to the second input port of the first analog switch to control the reset of the first relay, the second relay, and the third relay.

[0040] The contacts of the first relay, K1, are connected in series between the first phase A voltage output terminal UA1 and the first phase A voltage receiving terminal UA1. ′ Between them, it is used to control the on / off state between the first A-phase voltage output terminal and the first A-phase voltage receiving terminal;

[0041] The contacts of the second relay, K2, are connected in series between the first phase B voltage output terminal UB1 and the first phase B voltage receiving terminal UB1. ′ Between them, it is used to control the on / off state between the first B-phase voltage output terminal and the first B-phase voltage receiving terminal;

[0042] The contacts of the third relay K3 are connected in series between the first C-phase voltage output terminal UC1 and the first C-phase voltage receiving terminal UC1. ′ Between them, it is used to control the on / off state between the first C-phase voltage output terminal and the first C-phase voltage receiving terminal;

[0043] The output port of the first analog switch SW1 is grounded;

[0044] The control circuit is connected to the channel address selection terminal of the first analog switch and is used to switch the connection status between the output port of the first analog switch and each input port of the first analog switch.

[0045] The working process of the analog switch bistable voltage switching circuit of this utility model is as follows: The control circuit controls the connection status between the output port and each input port of the first analog switch in real time; when the output port is connected to the first input port, the analog switch bistable voltage switching circuit receives the first action signal in real time. When the first action signal is received, the action coils of the first relay, the second relay, and the third relay are energized, and the contact pairs of the first relay, the second relay, and the third relay all close, thereby connecting the first phase A voltage output terminal and the first phase A voltage. The receiving end includes the first B-phase voltage output terminal and the first B-phase voltage receiving terminal, as well as the first C-phase voltage output terminal and the first C-phase voltage receiving terminal. Similarly, when the output port is connected to the second input port, the analog switch bistable voltage switching circuit receives the first reset signal in real time. When the first reset signal is received, the contact pairs of the first relay, the contact pairs of the second relay, and the contact pairs of the third relay are all disconnected, thereby disconnecting the first A-phase voltage output terminal and the first A-phase voltage receiving terminal, the first B-phase voltage output terminal and the first B-phase voltage receiving terminal, and the first C-phase voltage output terminal and the first C-phase voltage receiving terminal.

[0046] This invention's analog switch bistable voltage switching circuit eliminates the need for separate drive circuits for relay operation and reset. Instead, it connects the operating and reset coils of multiple relays in series and uniformly connects them to different input ports of the analog switch. This avoids independent wiring for each relay, simplifying the circuit structure. Furthermore, by introducing a combination of analog switch and control circuit, bistable switching is achieved without the need for a complex bistable holding circuit, effectively saving internal space and cost in the control device. Moreover, utilizing the channel address selection function of the analog switch allows for flexible switching between operating and reset signals, enabling synchronous operation and reset of multiple relays. Finally, the relay contacts control the on / off state of the three-phase voltage, ensuring consistency and stability of the three-phase voltage switching and preventing anomalies caused by single-phase delays or failures.

[0047] In one embodiment, it also includes:

[0048] The second action signal input terminal DZ2 is connected in series with the action coils of the fourth relay K14, the fifth relay K15, and the sixth relay K16, and then connected to the third input port of the first analog switch SW1 to control the action of the fourth, fifth, and sixth relays.

[0049] The second reset signal input terminal FW2 is connected in series with the reset coils of the fourth, fifth, and sixth relays, and then connected to the fourth input port of the first analog switch to control the reset of the fourth, fifth, and sixth relays.

[0050] The contacts of the fourth relay, K4, are connected in series with the second phase A voltage output terminal UA2 and the second phase A voltage receiving terminal UA2. ′ Between them, it is used to control the on / off state between the second A-phase voltage output terminal and the second A-phase voltage receiving terminal;

[0051] The contacts of the fifth relay, K5, are connected in series with the second phase B voltage output terminal UB2 and the second phase B voltage receiving terminal UB2. ′ Between them, it is used to control the on / off state between the second B-phase voltage output terminal and the second B-phase voltage receiving terminal;

[0052] The contacts of the sixth relay, K6, are connected in series with the second C-phase voltage output terminal UC2 and the second C-phase voltage receiving terminal UC2. ′ Between them, it is used to control the on / off state between the second C-phase voltage output terminal and the second C-phase voltage receiving terminal.

[0053] The analog switch bistable voltage switching circuit of this embodiment can realize the connection and disconnection of two three-phase voltages.

[0054] In one embodiment, a first voltage divider branch is connected in series between the first action signal input terminal and the action coil of the first relay; a second voltage divider branch is connected in series between the first reset signal input terminal and the reset coil of the first relay; a third voltage divider branch is connected in series between the second action signal input terminal and the action coil of the fourth relay; and a fourth voltage divider branch is connected in series between the second reset signal input terminal and the reset coil of the fourth relay. Each voltage divider branch includes two voltage divider resistors connected in series.

[0055] Specifically, the first voltage divider branch includes a first voltage divider resistor R10 and a second voltage divider resistor R11 connected in series; the second voltage divider branch includes a third voltage divider resistor R12 and a fourth voltage divider resistor R13 connected in series; the third voltage divider branch includes a fifth voltage divider resistor R20 and a sixth voltage divider resistor R21 connected in series; and the fourth voltage divider branch includes a seventh voltage divider resistor R22 and an eighth voltage divider resistor R23 connected in series.

[0056] By setting up four voltage divider branches, overvoltage can be avoided from causing the first, second, third, fourth, fifth, and sixth relays to burn out, thus achieving overvoltage protection for the analog switch bistable voltage switching circuit.

[0057] In one embodiment, the connection point of the first voltage divider branch to the operating coil of the first relay is grounded through the first filter capacitor C10, the connection point of the second voltage divider branch to the reset coil of the first relay is grounded through the second filter capacitor C11, the connection point of the third voltage divider branch to the operating coil of the fourth relay is grounded through the third filter capacitor C20, and the connection point of the fourth voltage divider branch to the reset coil of the fourth relay is grounded through the fourth filter capacitor C21.

[0058] By setting filter capacitors between the four voltage divider branches and ground, the first action signal, the first reset signal, the second action signal, and the second reset signal can be filtered to prevent noise interference, thereby making the operation of the analog switch bistable voltage switching circuit more stable.

[0059] In one embodiment, the first action signal input terminal, the first reset signal input terminal, the second action signal input terminal, and the second reset signal input terminal are respectively grounded through transient suppression diodes.

[0060] Specifically, the first action signal input terminal is grounded through the first transient suppression diode TVS10, the first reset signal input terminal is grounded through the second transient suppression diode TVS11, the second action signal input terminal is grounded through the third transient suppression diode TVS20, and the second reset signal input terminal is grounded through the fourth transient suppression diode TVS21.

[0061] By setting transient suppression diodes at the first action signal input terminal, the first reset signal input terminal, the second action signal input terminal, and the second reset signal input terminal respectively, the energy of the spike pulse can be quickly discharged, protecting the subsequent circuits.

[0062] In one embodiment, the fourth input port of the first analog switch is connected to the cathode of the first Zener diode D20, and the anode of the first Zener diode is grounded after being connected in series with the third grounding resistor R36; the second input port of the first analog switch is connected to the cathode of the second Zener diode D10, and the anode of the second Zener diode is grounded after being connected in series with the fourth grounding resistor R15.

[0063] By connecting a Zener diode and a grounding resistor in series to the second input port of the analog switch and then grounding it, we can ensure that a high level input in the circuit between the first action signal input terminal and the first analog switch is clamped and protected, thus ensuring the normal operation of the components. Similarly, by connecting a Zener diode and a grounding resistor in series to the fourth input port of the analog switch and then grounding it, we can ensure that a high level input in the circuit between the second action signal input terminal and the first analog switch is clamped and protected, thus ensuring the normal operation of the components.

[0064] In one embodiment, the control circuit includes:

[0065] The third optocoupler U30 has its primary side first end connected to the output port of the first analog switch and its second end grounded. The secondary side first end of the third optocoupler is connected to the first IO pin of the CPU controller U1 and its secondary side second end is grounded. It is used to acquire the first action signal, the first reset signal, the second action signal, or the second reset signal.

[0066] The first optocoupler U31 has its primary side grounded at the first end and connected to the second IO pin of the CPU controller at the second end. One end of its secondary side is connected to the power supply voltage output terminal VDD through the first pull-up resistor R30, and the other end is connected to the first channel address selection terminal of the first analog switch, which is used to send logic control signals to the first analog switch under the control of the CPU controller.

[0067] The second optocoupler U32 has its primary side grounded at the first end and connected to the third IO pin of the CPU controller at the second end. One end of its secondary side is connected to the power supply voltage output terminal VDD through the second pull-up resistor R38, and the other end is connected to the second channel address selection terminal of the first analog switch, which is used to send logic control signals to the first analog switch under the control of the CPU controller.

[0068] The control circuit in this embodiment works as follows: the logic control signal sent by the first optocoupler to the first analog switch has two levels, high and low, and the logic control signal sent by the second optocoupler to the first analog switch also has two levels, high and low. Therefore, the logic control signals sent by the first and second optocouplers to the first analog switch can be combined into four control commands, corresponding to four connection states of the output port and input port of the first analog switch. The four connection states are: output port connected to the first input port, output port connected to the second input port, output port connected to the third input port, and output port connected to the fourth input port. When the output port is connected to the first input port, the first action signal is received in real time; when the output port is connected to the second input port, the first reset signal is received in real time; when the output port is connected to the third input port, the second action signal is received in real time; and when the output port is connected to the fourth input port, the second reset signal is received in real time.

[0069] The control circuit of this embodiment can conveniently control the connection status between the output port and each input port of the first analog switch. By setting a third optocoupler in the control circuit to acquire the first action signal, the first reset signal, the second action signal, or the second reset signal, and by setting the first optocoupler and the second optocoupler to send logic control signals to the first analog switch, the strong and weak current separation of the entire analog switch bistable voltage switching circuit is ensured, further guaranteeing the accuracy, reliability, and safety of the output control.

[0070] In one embodiment, the first terminal of the secondary side of the third optocoupler U30 is also connected to the first power supply voltage output terminal VDD through the third pull-up resistor R32; the second terminal of the primary side of the first optocoupler is also grounded through the first grounding resistor R31; and the second terminal of the primary side of the second optocoupler is also grounded through the second grounding resistor R37.

[0071] By connecting the first terminal of the secondary side of the third optocoupler to the first power supply voltage output terminal through a pull-up resistor, it can be ensured that the first IO pin of the CPU controller is at a high level when the analog switch bistable voltage switching circuit does not receive a corresponding control signal. By grounding the second terminal of the primary side of the first optocoupler through the first grounding resistor, it can be ensured that the primary side of the first optocoupler is at a low level and no current flows when the CPU controller does not send a control signal to the primary side of the first optocoupler. Similarly, by grounding the second terminal of the primary side of the second optocoupler through the second grounding resistor, it can be ensured that the primary side of the second optocoupler is at a low level and no current flows when the CPU controller does not send a control signal to the primary side of the second optocoupler.

[0072] In one embodiment, a current-limiting resistor R35 is connected in series between the first terminal of the primary side of the third optocoupler and the output port of the first analog switch.

[0073] By connecting a current-limiting resistor in series between the first terminal of the primary side of the third optocoupler and the output port of the first analog switch, excessive current can be prevented from burning out the third optocoupler, thus protecting the third optocoupler.

[0074] In one embodiment, a diode R35 is connected in parallel to the primary side of the third optocoupler, wherein the anode of the diode is connected to the first end of the primary side of the third optocoupler U30, and the cathode of the diode is connected to the second end of the primary side of the third optocoupler.

[0075] By connecting a diode in parallel with the primary side of the third optocoupler, reverse power supply protection can be provided for the third optocoupler.

[0076] While this specification has shown and described various embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention.

Claims

1. A bistable voltage switching circuit for analog switches, characterized in that, include: The first action signal input terminal is connected in series with the action coils of the first relay, the second relay, and the third relay, and then connected to the first input port of the first analog switch to control the action of the first relay, the second relay, and the third relay. The first reset signal input terminal is connected in series with the reset coils of the first relay, the second relay, and the third relay, and then connected to the second input port of the first analog switch to control the reset of the first relay, the second relay, and the third relay. The contacts of the first relay are connected in series between the first A-phase voltage output terminal and the first A-phase voltage receiving terminal to control the on / off state between the first A-phase voltage output terminal and the first A-phase voltage receiving terminal. The contacts of the second relay are connected in series between the first phase B voltage output terminal and the first phase B voltage receiving terminal to control the on / off state between the first phase B voltage output terminal and the first phase B voltage receiving terminal. The contacts of the third relay are connected in series between the first C-phase voltage output terminal and the first C-phase voltage receiving terminal to control the on / off state between the first C-phase voltage output terminal and the first C-phase voltage receiving terminal. The output port of the first analog switch is grounded; The control circuit is connected to the channel address selection terminal of the first analog switch and is used to switch the connection status between the output port of the first analog switch and each input port of the first analog switch.

2. The analog switch bistable voltage switching circuit as described in claim 1, characterized in that, Also includes: The second action signal input terminal is connected in series with the action coils of the fourth relay, the fifth relay, and the sixth relay, and then connected to the third input port of the first analog switch to control the action of the fourth relay, the fifth relay, and the sixth relay. The second reset signal input terminal is connected in series with the reset coils of the fourth relay, the fifth relay, and the sixth relay, and then connected to the fourth input port of the first analog switch to control the reset of the fourth, fifth, and sixth relays. The contacts of the fourth relay are connected in series between the second phase A voltage output terminal and the second phase A voltage receiving terminal to control the on / off state between the second phase A voltage output terminal and the second phase A voltage receiving terminal. The contacts of the fifth relay are connected in series between the second phase B voltage output terminal and the second phase B voltage receiving terminal to control the on / off state between the second phase B voltage output terminal and the second phase B voltage receiving terminal. The contacts of the sixth relay are connected in series between the second C-phase voltage output terminal and the second C-phase voltage receiving terminal to control the on / off state between the second C-phase voltage output terminal and the second C-phase voltage receiving terminal.

3. The analog switch bistable voltage switching circuit as described in claim 2, characterized in that, A first voltage divider branch is connected in series between the first action signal input terminal and the action coil of the first relay; a second voltage divider branch is connected in series between the first reset signal input terminal and the reset coil of the first relay; a third voltage divider branch is connected in series between the second action signal input terminal and the action coil of the fourth relay; and a fourth voltage divider branch is connected in series between the second reset signal input terminal and the reset coil of the fourth relay. Each voltage divider branch includes two voltage divider resistors connected in series.

4. The analog switch bistable voltage switching circuit as described in claim 3, characterized in that, The connection point of the first voltage divider branch to the operating coil of the first relay is grounded through the first filter capacitor; the connection point of the second voltage divider branch to the reset coil of the first relay is grounded through the second filter capacitor; the connection point of the third voltage divider branch to the operating coil of the fourth relay is grounded through the third filter capacitor; and the connection point of the fourth voltage divider branch to the reset coil of the fourth relay is grounded through the fourth filter capacitor.

5. The analog switch bistable voltage switching circuit as described in claim 2, characterized in that, The first action signal input terminal, the first reset signal input terminal, the second action signal input terminal, and the second reset signal input terminal are all grounded through transient suppression diodes.

6. The analog switch bistable voltage switching circuit as described in claim 2, characterized in that, The fourth input port of the first analog switch is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded after being connected in series with a third grounding resistor; the second input port of the first analog switch is connected to the cathode of the second Zener diode, and the anode of the second Zener diode is grounded after being connected in series with a fourth grounding resistor.

7. The analog switch bistable voltage switching circuit as described in any one of claims 1 to 6, characterized in that, The control circuit includes: The third optocoupler has its primary side first end connected to the output port of the first analog switch and its second end grounded. The secondary side first end of the third optocoupler is connected to the first IO pin of the CPU controller and its secondary side second end is grounded. It is used to acquire the first action signal, the first reset signal, the second action signal, or the second reset signal. The first optocoupler has a primary side with its first end grounded and its second end connected to the second IO pin of the CPU controller. One end of its secondary side is connected to the power supply voltage output terminal through a pull-up resistor, and the other end is connected to the first channel address selection terminal of the first analog switch. It is used to send logic control signals to the first analog switch under the control of the CPU controller. The second optocoupler has its primary side grounded at one end and connected to the third I / O pin of the CPU controller at the other end. One end of its secondary side is connected to the power supply voltage output terminal through a pull-up resistor, and the other end is connected to the second channel address selection terminal of the first analog switch. It is used to send logic control signals to the first analog switch under the control of the CPU controller.

8. The analog switch bistable voltage switching circuit as described in claim 7, characterized in that, The first terminal of the secondary side of the third optocoupler is also connected to the first power supply voltage output terminal through a pull-up resistor; the second terminal of the primary side of the first optocoupler is also grounded through a first grounding resistor; the second terminal of the primary side of the second optocoupler is also grounded through a second grounding resistor.

9. The analog switch bistable voltage switching circuit as described in claim 7, characterized in that, A current-limiting resistor is connected in series between the first terminal of the primary side of the third optocoupler and the output port of the first analog switch.

10. The analog switch bistable voltage switching circuit as described in claim 7, characterized in that, A diode is connected in parallel to the primary side of the third optocoupler, wherein the anode of the diode is connected to the first end of the primary side of the third optocoupler, and the cathode of the diode is connected to the second end of the primary side of the third optocoupler.

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