CN218124381U

CN218124381U - Electric operation locking control circuit, dual-power switching circuit and control device

Info

Publication number: CN218124381U
Application number: CN202220591268.7U
Authority: CN
Inventors: 董俊丽; 周志田; 解骏; 张建平; 赵云飞
Original assignee: Zhengzhou Smartgen Technology Co Ltd
Current assignee: Zhengzhou Smartgen Technology Co Ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-12-23
Anticipated expiration: 2032-03-18

Abstract

The utility model provides an electric operation locking control circuit, a dual power supply switching circuit and a control device, wherein the electric operation locking control circuit comprises a main controller and a self-locking switching circuit connected with the main controller, and the self-locking switching circuit comprises a wiring terminal, a TVS tube D1, a diode D2, a pull-up resistor, a current-limiting resistor and a capacitor filter circuit; the dual-power switching circuit comprises the electric operation locking control circuit, and also comprises a relay K1, a relay K2, a relay K3, a relay K4, a way I auxiliary state switch QS1 and a way II auxiliary state switch QS2 which are respectively connected with the main controller; the dual-power control device comprises a dual-power switching circuit and further comprises a first voltage sampling circuit, a second voltage sampling circuit and a third voltage sampling circuit which are respectively connected with the main controller.

Description

Electric operation locking control circuit, dual-power switching circuit and control device

Technical Field

The utility model relates to a power control technical field, specific theory has related to an electrically operated locking control circuit, dual supply switching circuit and controlling means.

Background

The dual power transfer Switching (ATS) refers to a switch that automatically switches to another power supply when power failure occurs, and at present, the dual power transfer Switching is widely used in the market, and is widely applied to important places where power failure is not allowed, such as high-rise buildings, residential areas, chemical engineering, textiles, and the like.

Aiming at different types of double-power-supply change-over switches, double-power-supply controllers are also developed in the market to realize the switching-on and switching-off functions of the switches; however, there are also disadvantages:

(1) The existing dual-power controller does not have the self-locking switching function

The dual-power automatic transfer switch is mainly divided into an electric operation mode and a manual operation mode, wherein the electric operation mode is usually used, and the manual operation mode is only needed when some special conditions are met; however, the existing dual power supply controller cannot inhibit or allow the switching of the electric operation through a circuit, and cannot meet the requirements of users;

(2) The operating mechanism generally realizes the conversion between the normal use and the standby use of the switch by controlling the positive and negative rotation of the motor; for a PC type high-capacity dual-power-supply change-over switch, the existing circuit for controlling the positive and negative rotation of a motor on the dual-power-supply switch through a dual-power-supply controller is complex;

(3) The state monitoring of the switching gate can not be performed

The double-power-supply controller sends a switching-off or switching-on instruction to the operating mechanism to control the positive and negative rotation of the motor to realize the conversion between the normal use and the standby use of the switch; it should be noted that after the operating mechanism performs the switching between the normal operation and the standby operation, the failure of the dual power source switch may occur due to the aging of the device or the mechanical failure;

however, the on-off state is not monitored inside the dual power transfer switch at present, and whether a fault occurs inside the dual power transfer switch cannot be determined in time, so that the troubleshooting efficiency is low.

In order to solve the above problems, people are always seeking an ideal technical solution.

Disclosure of Invention

The utility model aims at the not enough of prior art to a electrically-operated locking control circuit, dual supply switching circuit and controlling means are provided.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is:

the utility model discloses a first aspect provides an electric operation locking control circuit, it includes the main control unit and with the auto-lock switching circuit that the main control unit is connected, the auto-lock switching circuit includes binding post, TVS pipe D1, diode D2, pull-up resistance, current-limiting resistance and electric capacity filter circuit;

the TVS tube D1 is arranged between the first interface and the second interface of the wiring terminal, one end of the TVS tube D1 is connected with the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with the power supply end through the pull-up resistor, the positive electrode of the diode D2 is connected with the main controller through the current-limiting resistor, and the capacitor filter circuit is arranged between the current-limiting resistor and the grounding end.

A second aspect of the present invention provides a dual power switching circuit, which includes the above-mentioned electrically operated locking control circuit, and further includes a relay K1, a relay K2, a relay K3, a relay K4, a way i auxiliary status switch QS1, and a way ii auxiliary status switch QS2, which are respectively connected to the main controller;

one end of a normally open contact of the relay K1 is used for being connected with one end of a first coil of the motor, and the other end of the normally open contact of the relay K1 is connected with a common end LO of the relay K4;

one end of a normally closed contact of the relay K2 is used for being connected with one end of a second coil of the motor, one end of a normally open contact of the way I auxiliary state switch QS1 and one end of a normally open contact of the way II auxiliary state switch QS2 respectively, and the other end of the normally closed contact of the relay K2 is connected with the other end of the normally open contact of the way I auxiliary state switch QS1 and the other end of the normally open contact of the way II auxiliary state switch QS2 respectively;

the relay K3 comprises a first normally-open contact and a second normally-open contact, the common end of the first normally-open contact is used for being connected with the other end of a first coil of the motor, one end of the first normally-open contact and one end of the second normally-open contact are respectively used for being connected with the other end of a second coil of the motor, the other end of the first normally-open contact is connected with a normally-closed contact of the auxiliary state switch QS1 in the path I, and the other end of the second normally-open contact is connected with a normally-closed contact of the auxiliary state switch QS2 in the path II;

the relay K4 comprises two normally open contacts, wherein two ends of one normally open contact are respectively used for being connected with a wiring end A1 of the I path of power supply and a wiring end A2 of the II path of power supply, and two ends of the other normally open contact are respectively used for being connected with a wiring end N1 of the I path of power supply and a wiring end N2 of the II path of power supply.

The third aspect of the present invention provides a dual power supply control device, which includes the above dual power supply switching circuit, and further includes a first voltage sampling circuit, a second voltage sampling circuit, and a third voltage sampling circuit;

the first input end of the first voltage sampling circuit is used for being connected with a sampling point b of the dual power supply switching circuit, the second input end of the first voltage sampling circuit is used for being connected with a common end LO, and the output end of the first voltage sampling circuit is used for being connected with a corresponding pin of the main controller;

the first input end of the second voltage sampling circuit is used for being connected with the sampling point a of the dual power supply switching circuit, the second input end of the second voltage sampling circuit is used for being connected with a common end LO, and the output end of the second voltage sampling circuit is used for being connected with a corresponding pin of the main controller;

and a first input end of the third voltage sampling circuit is used for being connected with a sampling point a of the dual-power switching circuit, a second input end of the third voltage sampling circuit is used for being connected with a public end NO, and an output end of the third voltage sampling circuit is used for being connected with a corresponding pin of the main controller.

The utility model has the advantages that:

1) The utility model provides an electric operation locking control circuit, a self-locking switching circuit is arranged between an ATS self-locking switch button on a dual-power switch and a controller, and the switching of electric operation is forbidden or allowed through the self-locking switching circuit, so that the electric operation locking control is realized;

2) The utility model also provides a dual power supply switching circuit, this dual power supply switching circuit carries out motor positive and negative rotation control through relay K1, relay K2, relay K3, relay K4, realizes the switching between way I power and way II power, dual power supply switching circuit possesses compact structure, simple wiring and high reliability advantage;

3) The utility model also provides a dual power supply control device sets up first voltage sampling circuit, second voltage sampling circuit and third voltage sampling circuit in dual power supply switch, from dual power supply switch inside to switching on and switching off state monitoring, for confirming whether the trouble takes place at dual power supply switch inside and provide the reference basis to improve troubleshooting efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a dual power supply switching circuit of the present invention;

fig. 2 is a schematic structural diagram of a dual power supply control device of the present invention;

FIG. 3 is a circuit schematic of the electrically operated lock control circuit of the present invention;

fig. 4 is a schematic circuit diagram of a first voltage sampling circuit of the dual power supply control device of the present invention;

fig. 5 is a schematic circuit diagram of the second voltage sampling circuit and the third voltage sampling circuit of the dual power supply control device of the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail through the following embodiments.

Example 1

As shown in fig. 3, an electric operation locking control circuit includes a main controller and a self-locking switching circuit connected to the main controller, where the self-locking switching circuit includes a connection terminal P1, a TVS tube D1, a diode D2, a pull-up resistor R31, a current-limiting resistor R32, and a capacitor filter circuit;

the first interface of the wiring terminal P1 is connected with an ATS self-locking switch button of a dual-power switch, the second interface of the wiring terminal P1 is connected with a grounding terminal, the TVS tube D1 is arranged between the first interface of the wiring terminal P1 and the second interface of the wiring terminal P1, one end of the TVS tube D1 is also connected with the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with a power supply end (+ 5.0V) through the pull-up resistor R31, the positive electrode of the diode D2 is also connected with the IO port of the main controller through the current-limiting resistor R32, and the capacitor filter circuit is arranged between the current-limiting resistor R32 and the grounding terminal.

It should be noted that when the IO port of the main controller outputs a high level, the self-locking of the dual power supply control device is invalid, the electric operation is prohibited, the switch can be controlled only by the operating handle on the dual power supply switch ATS, and the dual power supply controller does not control the ATS switch; when the IO port of the main controller outputs low level, the self-locking of the dual-power control device is effective, electric operation is allowed, and the dual-power control device can control the ATS switch to act; therefore, the IO port of the main controller outputs high and low levels, and the self-locking switching circuit is used for forbidding or allowing the electric operation to be switched, so that the dual-power-supply control device has the self-locking switching function.

It can be understood that the wiring terminal P1 (two-pin terminal) of the self-locking switching circuit is connected with two wires by leading out from an ATS self-locking switch button on a dual-power switch, and the wiring is simple; in addition, the circuit structure of the self-locking switching circuit is simple, the control is simple, the cost is low, and the requirement that a user forbids or allows switching between electric operations is met.

Furthermore, the main controller is also connected with an indicator lamp for prohibiting electric operation, the indicator lamp for prohibiting electric operation is turned on when the self-locking of the dual-power-supply control device is invalid, and the indicator lamp for prohibiting electric operation is turned off when the self-locking of the dual-power-supply control device is valid, so that the self-locking state of the dual-power-supply control device is indicated, and a user is reminded whether the electric operation of the dual-power-supply control device is available.

Specifically, the electric operation prohibition indicator lamp is a light emitting diode.

It can be understood that when transient interference voltage or pulse current with large amplitude appears due to factors such as lightning, various electrical appliance interference and the like in the circuit, the TVS tube D1 can effectively prevent the internal circuit of the board from being damaged; the diode D2 plays a role of preventing reverse connection; the capacitor filter circuit comprises a resistor R23 and a capacitor C7, wherein the resistor R32 plays a role in current limiting, and simultaneously forms a loop with the resistors R33 and R31 to play a role in voltage division, and the capacitor C7 plays a role in filtering.

Example 2

This embodiment provides a specific implementation of a dual power switching circuit, as shown in fig. 1;

the dual power supply switching circuit comprises an electric operation locking control circuit in embodiment 1, and further comprises a relay K1, a relay K2, a relay K3, a relay K4, a way I auxiliary state switch QS1 and a way II auxiliary state switch QS2 which are respectively connected with the main controller through a driving circuit;

one end of a normally open contact of the relay K1 is used for being connected with one end (a blue wiring end) of a first coil of the motor, and the other end of the normally open contact of the relay K1 is connected with a common end LO of the relay K4;

one end of a normally closed contact of the relay K2 is used for being connected with one end (a white wiring end) of a second coil of the motor, one end of a normally open contact of the auxiliary state switch QS1 of the circuit I and one end of a normally open contact of the auxiliary state switch QS2 of the circuit II respectively, and the other end of the normally closed contact of the relay K2 is connected with the other end of the normally open contact of the auxiliary state switch QS1 of the circuit I and the other end of the normally open contact of the auxiliary state switch QS2 of the circuit II respectively;

the relay K3 comprises a first normally-open contact and a second normally-open contact, the common end of the first normally-open contact is used for being connected with the other end (a red wiring end) of a first coil of the motor, one end of the first normally-open contact and one end of the second normally-open contact are respectively used for being connected with the other end (a black wiring end) of a second coil of the motor, the other end of the first normally-open contact is connected with a normally-closed contact of a way I auxiliary state switch QS1, and the other end of the second normally-open contact is connected with a normally-closed contact of a way II auxiliary state switch QS2;

the relay K4 comprises two normally open contacts, wherein two ends of one normally open contact are respectively used for being connected with a wiring end A1 of a power supply in a path I and a wiring end A2 of a power supply in a path II, and two ends of the other normally open contact are respectively used for being connected with a wiring end N1 of the power supply in the path I and a wiring end N2 of the power supply in the path II.

In a specific embodiment, a motor arranged in a PC type large-capacity dual-power switch is a 4-wire motor (two groups of coils), and the forward rotation of the motor is changed by controlling the serial direction of one group of coils, and the reverse rotation of the motor is changed by controlling the serial direction of the other group of coils;

as shown in fig. 1, the relay K1 is a normally open relay, and is used for closing control of a switch; the relay K2 is a normally closed relay and is used for opening and closing control of a switch; the relay K3 is two groups of switching relays and is used for controlling the positive and negative switching of the motor; the terminal A1 and the terminal N1 of the first power supply and the terminal A2 and the terminal N2 of the second power supply are controlled by the attraction of two groups of switching relays K4, so that the switching between the first power supply and the second power supply is realized; two common ends of the relay K4 are respectively connected with LO and NO, wherein the LO and NO are connected with an output port of the dual-power-supply control device; the first path of auxiliary state switch QS1 is a path of auxiliary state point, the second path of auxiliary state switch QS2 is a path of auxiliary state point, and a normally open point and a normally closed point are separated from each other as can be seen from fig. 1;

therefore, the dual-power switching circuit has the function of controlling the reverse rotation and the forward rotation of the motor on the basis of the self-locking switching function.

Specifically, the main controller adopts an STM32 series single chip microcomputer or other controllers capable of realizing the functions; the drive circuits of the relay K1, the relay K2, the relay K3, the relay K4 and the like are connected with the coils of the corresponding relays, and the circuit structure (comprising a triode) of the drive circuit is the prior art known by the technical personnel in the field and is not described again.

Example 3

The present embodiment describes a dual power supply switching circuit in embodiment 2, taking a PC-type large-capacity switch as an example, when self-locking is effective (electric operation is permitted):

(1) When the auto-lock is effective, accessible dual power supply control device's button manual operation carries out the divide-shut brake, realizes the switching of ATS switch through the input port, and the theory of operation is:

1) Switching off, pressing a switching-off input button:

a) The opening input port is effective, if the opening input port is in a closing state of a path I, a normally closed point of a path I auxiliary state switch QS1 is opened, a normally open point is closed, a relay K3 outputs, a relay K2 outputs 5S, a relay K1 outputs, and a motor rotates reversely; until the auxiliary state switch QS1 of the I path acts, the normally closed point of the auxiliary state switch QS1 of the I path is closed, the normally open point is opened, and the motor stops rotating;

b) The opening input port is effective, if the opening input port is in a closing state of a second path, a normally closed point of a second auxiliary state switch QS2 is opened, a normally open point is closed, a relay K3 does not output, the relay K2 outputs 5S, a relay K1 outputs, and the motor rotates forwards; until the second auxiliary state switch QS2 acts, the normally closed point and the normally open point of the second auxiliary state switch QS2 are closed and disconnected, and the motor stops rotating;

2) Closing:

c) Pressing the I-way switch-on input button, the ATS switch closes the I-way, and the load is powered by the I-way power supply

The I path is not at the switching-on position, the switching-on input port of the I path is effective, the relay K3 outputs, the relay K2 coil is normally closed through the normally closed contact of the QS1 auxiliary state switch of the I path, the motor rotates forwards, and the I path is switched on. The normally closed point of a path I auxiliary state switch QS1 is disconnected, the normally open point is closed, the motor stops rotating, a relay K1 is disconnected, and a relay K3 keeps normal;

d) Pressing the switch-on input button of the II path, the ATS switch closes the II path, and the load is supplied by the power supply of the II path

The second path is not at the switching-on position, the switching-on input port of the second path is effective, the relay K3 does not output, the coil of the relay K2 is normally closed, the QS2 switch in the auxiliary state of the second path is normally closed, the motor rotates reversely, and the second path is switched on; and (3) until the closing is finished, the normally closed point and the normally open point of the QS2 of the auxiliary state switch II are disconnected, and the motor stops rotating. The relay K1 is disconnected, and the relay K3 is kept in a normal state.

(2) When the auto-lock is effective, can also carry out the divide-shut brake through dual power supply control device automatic operation, the theory of operation is:

a) The power supply I is normal, the power supply II is normal, the power supply I is mainly used, and the power supply I is switched on if the power supply I is normal; if the power supply I is abnormal and the power supply II is normal, the power supply II is switched on; if the power supply I returns to normal, the power supply I is switched on;

it can be understood that if the previous path I is not successfully switched on, the relay K3 is switched on, the relay K2 coil is switched on through the closing of a normally closed point of a path I auxiliary state switch QS1, after the normally closed state is kept, the relay K1 is switched on, the motor rotates forwards, and the path I is switched on; until the QS1 of the auxiliary state switch of the I path acts, the normally open point of the QS1 of the auxiliary state switch of the I path is closed, the normally closed point is opened, the motor stops, the relay K1 is opened, and the relay K3 keeps a normal state;

b) The power supply I is normal, the power supply II is mainly used, and if the power supply II is normal, the power supply II is switched on; if the power supply II is abnormal and the power supply I is normal, switching on the power supply I; if the power supply II returns to normal, the power supply II is switched on;

it can be understood that if the previous path II is not successfully switched on, the coil of the relay K3 is not switched, and the normally closed contact of the coil of the relay K2 is switched on through the normally closed contact of the auxiliary state switch QS2 of the path II. Closing a relay K1, reversing a motor and closing a path II; until the auxiliary state switch QS2 of the II paths acts, the normally closed point and the normally open point of the auxiliary state switch QS2 of the II paths are disconnected and closed, the motor stops, the relay K1 is disconnected, and the relay K3 keeps normal.

Example 4

The embodiment provides a specific implementation mode of a dual power supply control device, as shown in fig. 1 and 2; the dual-power-supply control device comprises the dual-power-supply switching circuit in embodiment 2 or 3, and further comprises a first voltage sampling circuit, a second voltage sampling circuit and a third voltage sampling circuit;

a first input end of the second voltage sampling circuit is used for being connected with a sampling point a of the dual power supply switching circuit, a second input end of the second voltage sampling circuit is used for being connected with a common end LO, and an output end of the second voltage sampling circuit is used for being connected with a corresponding pin of the main controller;

and a first input end of the third voltage sampling circuit is used for being connected with a sampling point a of the dual-power switching circuit, a second input end of the third voltage sampling circuit is used for being connected with a public terminal NO, and an output end of the third voltage sampling circuit is used for being connected with a corresponding pin of the main controller.

As shown in fig. 4, the first voltage sampling circuit includes a resistor string i, a resistor string ii, a first pull-up resistor R24, a magnetic bead L3, and a pi-type filter circuit i, where one end of the resistor string i is connected to a common terminal LO, and the other end of the resistor string i is connected to a sampling point b of the dual power switching circuit and one end of the resistor string ii respectively; the other end of the resistor string II is connected with one end of the first pull-up resistor R24 and one end of the magnetic bead L3 respectively, and the other end of the magnetic bead L3 is connected with a corresponding pin (IO port Volt _ b _ In) of the main controller through the pi-type filter circuit I.

As shown in fig. 5, the second voltage sampling circuit includes a resistor string iii, a resistor string iv, a second pull-up resistor R4, a magnetic bead L1, and a pi-type filter circuit ii, where one end of the resistor string iii is connected to a common terminal LO, and the other end of the resistor string iii is connected to a sampling point a of the dual power switching circuit, one end of the resistor string iv, and the third voltage sampling circuit, respectively; the other end of the resistor string IV is respectively connected with one end of the second pull-up resistor R4 and one end of the magnetic bead L1, and the other end of the magnetic bead L1 is connected with a corresponding pin (IO port Volt _ a _ In) of the main controller through the pi-type filter circuit II;

the third voltage sampling circuit comprises a resistor string V, a resistor string VI, a third pull-up resistor R14, a magnetic bead L2 and a pi-type filter circuit III, wherein one end of the resistor string V is connected with a sampling point a of the dual-power switching circuit, and the other end of the resistor string V is connected with a public end NO and one end of the resistor string VI respectively; the other end of the resistor string VI is respectively connected with one end of the third pull-up resistor R4 and one end of the magnetic bead L2, and the other end of the magnetic bead L2 is connected with a corresponding pin of the main controller through the pi-type filter circuit III.

It can be understood that, the dual power supply control device monitors the switching-on/off state from the inside of the dual power supply changeover switch through the first voltage sampling circuit, the second voltage sampling circuit and the third voltage sampling circuit, and can be carried out according to the following four conditions when the switching-on/off state is subsequently determined:

1) When the potentials of points a and b collected by ADC ports Volt _ a _ In and Volt _ b _ In of the single chip microcomputer are equal to the input value of NO, the I path power supply and the II path power supply are In a switching-off state;

2) When ADC ports Volt _ a _ In and Volt _ b _ In of the single chip microcomputer acquire an input value with a point a electric potential equal to LO/2 and an input value with a point b electric potential equal to NO, the I path of power supply is In a switching-on state, and the II path of power supply is In a switching-off state;

3) When the ADC ports Volt _ a _ In and Volt _ b _ In of the single chip microcomputer acquire input values with the potentials of a point a and a point b equal to 2LO/3, indicating that the power supply of the path I is In an opening state and the power supply of the path II is In a closing state;

4) When ADC ports Volt _ a _ In and Volt _ b _ In of the single chip microcomputer acquire that the potential of a point a is an input value of LO/2 and the potential of a point b is an input value of LO, the I path of power supply and the II path of power supply are both In a switching-on state;

as shown in the following table:

it can be understood that the upper table can be prestored in the dual-power control device, so that after the switching state of the dual-power control device is monitored, the I-way switching-on state and the II-way switching-on state can be judged simply and quickly according to the collected sampling points a and b.

It should be noted that the sum of the resistances of the first voltage sampling circuit, the second voltage sampling circuit, and the third voltage sampling circuit cannot exceed an excessive value (for example, 100 Ω), and if the resistance of this part of the resistances is excessive, the IO port of the single chip may not collect a voltage value.

Specifically, the main controller adopts a singlechip GD32E230C8T6, magnetic beads L1, L2 and L3 are patch magnetic beads, and the main function is to eliminate RF noise existing on a transmission line;

the IO ports Volt _ a _ In and Volt _ b _ In of the single-chip microcomputer In fig. 2, 4 and 5 are ADC ports of the single-chip microcomputer, and Volt b is a sampling point b (a 3-pin terminal connected to one gear input of an internal terminal of a dual power switch) of the dual power switch circuit; the first pull-up resistor R24 is connected to a reference voltage connection point Vref; it can be understood that the reference voltage connection point Vref is a reference voltage value of the voltage collected by the IO port of the single chip microcomputer, the reference voltage value is 1.65V, the source is that the power supply voltage of the single chip microcomputer is +3.3V, and 1.65V is obtained after voltage division is performed by two 300 Ω resistors; the acquired voltage value is converted into a numerical value by using a 12-bit ADC (analog-to-digital converter) integrated in the single chip microcomputer GD32E230C8T6, so that the circuit structure is simplified, and the cost is saved.

Specifically, the main controller is further connected to a communication module, which may be a wireless communication module or a wired communication module, for example, a bluetooth wireless communication module.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. An electrically operated lock control circuit, characterized by: the self-locking switching circuit comprises a main controller and a self-locking switching circuit connected with the main controller, wherein the self-locking switching circuit comprises a wiring terminal, a TVS (transient voltage suppressor) D1, a diode D2, a pull-up resistor, a current-limiting resistor and a capacitor filter circuit;

2. The electrically operated lock control circuit according to claim 1, wherein: the main controller is also connected with an electric operation forbidding indicator lamp.

3. A dual power switching circuit is characterized in that: the electrically operated lock control circuit according to claim 1 or 2, further comprising a relay K1, a relay K2, a relay K3, a relay K4, a line i auxiliary state switch QS1, and a line ii auxiliary state switch QS2, which are respectively connected to the main controller;

one end of a normally closed contact of the relay K2 is used for being connected with one end of a second coil of the motor, one end of a normally open contact of the auxiliary state switch QS1 of the I path and one end of a normally open contact of the auxiliary state switch QS2 of the II path respectively, and the other end of the normally closed contact of the relay K2 is connected with the other end of the normally open contact of the auxiliary state switch QS1 of the I path and the other end of the normally open contact of the auxiliary state switch QS2 of the II path respectively;

4. A dual power supply control device is characterized in that: the dual power switching circuit of claim 3, further comprising a first voltage sampling circuit, a second voltage sampling circuit, and a third voltage sampling circuit;

5. The dual-power-supply control device according to claim 4, characterized in that: the first voltage sampling circuit comprises a resistor string I, a resistor string II, a first pull-up resistor, a magnetic bead L3 and a pi-type filter circuit I,

one end of the resistor string I is connected with a common end LO, and the other end of the resistor string I is respectively connected with a sampling point b of the dual-power switching circuit and one end of the resistor string II;

the other end of the resistor string II is connected with one end of the first pull-up resistor and one end of the magnetic bead L3 respectively, and the other end of the magnetic bead L3 is connected with a corresponding pin of the main controller through the pi-type filter circuit I.

6. The dual power supply control device according to claim 4, characterized in that: the second voltage sampling circuit comprises a resistor string III, a resistor string IV, a second pull-up resistor, a magnetic bead L1 and a pi-type filter circuit II,

one end of the resistor string III is connected with a common end LO, and the other end of the resistor string III is respectively connected with a sampling point a of the dual-power switching circuit, one end of the resistor string IV and the third voltage sampling circuit;

the other end of the resistor string IV is connected with one end of the second pull-up resistor and one end of the magnetic bead L1 respectively, and the other end of the magnetic bead L1 is connected with a corresponding pin of the main controller through the pi-type filter circuit II.

7. The dual-power-supply control device according to claim 4, characterized in that: the third voltage sampling circuit comprises a resistor string V, a resistor string VI, a third pull-up resistor, a magnetic bead L2 and a pi-type filter circuit III, wherein,

one end of the resistor string V is connected with a sampling point a of the dual-power switching circuit, and the other end of the resistor string V is connected with a public end NO and one end of the resistor string VI respectively;

the other end of the resistor string VI is respectively connected with one end of the third pull-up resistor and one end of the magnetic bead L2, and the other end of the magnetic bead L2 is connected with a corresponding pin of the main controller through the pi-type filter circuit III.

8. The dual-power-supply control device according to claim 4, characterized in that: the model of the main controller is GD32E230C8T6.

9. The dual power supply control device according to claim 4, characterized in that: the main controller is also connected with the communication module.