High-power wireless switching circuit

Abstract

The utility model relates to the field of switch circuits, in particular to a high-power wireless switch circuit, which comprises a wireless transmitting panel and a switch control unit, a main switch module and a built-in power supply are arranged in the wireless transmitting panel, the main switch module is electrically connected with the built-in power supply, and the switch control unit is electrically connected with the main switch module. The switch control unit comprises a high-voltage rectification input module, a power supply control module, a transformer T1, a low-voltage filtering module, a receiving module and a relay control module; the main switch module is wirelessly connected with the receiving module through the wireless transmitting panel; the main switch module transmits a control signal to the receiving module through the wireless transmitting panel; the high-voltage rectification input module and the power supply control module provide a 5V1A power supply for a secondary side through the transformer T1, and a receiving signal controls the on-off of the relay control module through a control signal, thereby achieving the wireless on-off control of a high-power electric appliance, reducing the switching control difficulty, and fully protecting the personal safety of a worker.

Description

Technical Field

[0001] The utility model relates to the field of switch circuits, in particular to a high-power wireless switch circuit. Background Art

[0002] A switch circuit refers to a circuit with two states: "on" and "off". The switch device in the switch circuit can control the on and off of the current according to the change of the control signal (such as a physical button, a voltage signal, a logic signal, etc.). The two states of the switch device are closed and open. In the closed state, the two contacts of the switch are well connected, the current can flow, and the load is supplied with power; in the open state, the two contacts of the switch are disconnected, the current cannot flow, and the load cannot be supplied with power.

[0003] In real life applications, large LED screens are increasingly used. Since the total power of LED screens is about 13KW (220V / 60A), in order to save costs and protect the screen, air switches are generally used to control the opening and closing of the equipment. When power is needed, the air switch is turned on, and when power is not needed, the air switch is manually turned off. However, since the air switch is generally connected in series in the main power supply circuit, it is necessary to go to a fixed position and even climb when manually switching it. The switch control is difficult and there is a certain risk of electric shock. Utility Model Content

[0004] The utility model aims to provide a high-power wireless switch circuit, aiming to improve the problem that the switching method of existing high-power electrical equipment is relatively complicated and there is a risk of electric shock.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A high-power wireless switch circuit includes a wireless transmission panel and a switch control unit.

[0007] The wireless transmission panel is provided with a main switch module and a built-in power supply, and the main switch module is electrically connected to the built-in power supply.

[0008] The switch control unit includes a high-voltage rectifier input module, a power supply control module, a transformer T1, a low-voltage filter module, a receiving module and a relay control module;

[0009] The main switch module is wirelessly connected to the receiving module via a wireless transmitting panel;

[0010] The high-voltage rectifier input module is connected to the mains, the output end of the high-voltage rectifier input module and the control end of the power control module are both electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the input end of the low-voltage filter module, the output end of the low-voltage filter module is electrically connected to the power input end of the receiving module and the relay control module, the control end of the receiving module is electrically connected to the signal input end of the relay control module, and the output end of the relay control module is electrically connected to an external electrical appliance.

[0011] Furthermore, the high-voltage rectifier input module includes a fuse F1, a common-mode inductor L1, a rectifier bridge D5, a polarized capacitor EC1 and a resistor R6;

[0012] One end of the fuse F1 is electrically connected to the live wire, the other end of the fuse F1 is electrically connected to pin 1 of the common-mode inductor L1, pin 4 of the common-mode inductor L1 is electrically connected to the neutral line, pin 2 of the common-mode inductor L1 is electrically connected to pin 2 of the rectifier bridge D5, and pin 3 of the common-mode inductor L1 is electrically connected to pin 4 of the rectifier bridge D5; pin 1 of the rectifier bridge D5 is electrically connected to the positive electrode of the polar capacitor EC1, one end of the resistor R6 and pin 1 of the transformer T1, the other end of the resistor R6 is electrically connected to the power control module, and pin 3 of the rectifier bridge D5 and the negative electrode of the polar capacitor EC1 are both grounded.

[0013] Furthermore, the power control module includes a control chip U1, a diode D2, a jumper J3, a polarized capacitor EC2, and resistors R1, R2, and R5;

[0014] Pins 5 and 6 of the control chip U1 are electrically connected to pin 2 of the transformer T1.

[0015] Pin 5 of the transformer T1 is electrically connected to one end of the jumper J3, the other end of the jumper J3 is electrically connected to the positive electrode of the diode D2 and one end of the resistor R1, the negative electrode of the diode D2 is electrically connected to the high-voltage rectifier input module, pin 2, pin 3, pin 4 of the control chip U1, one end of the resistor R5 and the positive electrode of the polarized capacitor EC2, and the other end of the resistor R1 is electrically connected to pin 1 of the control chip U1 and one end of the resistor R2;

[0016] The other end of the resistor R2, the other end of the resistor R5, the negative electrode of the polarized capacitor EC2, the pin 8 of the control chip U1 and the pin 4 of the transformer T1 are all grounded.

[0017] Furthermore, the model of the control chip U1 is LP3773CH.

[0018] Furthermore, the low-voltage filter module includes a diode D1, a light-emitting diode LED1, a polarized capacitor EC3, and resistors R4 and R7;

[0019] Pin 10 of the transformer T1 is electrically connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 is electrically connected to the positive electrode of the polar capacitor EC3, one end of the resistor R4, the positive electrode of the light-emitting diode LED1, the positive input end of the receiving module and the relay control module, and is electrically connected to an external device as an output positive electrode; the negative electrode of the light-emitting diode LED1 is electrically connected to one end of the resistor R7, and the pin 6 of the transformer T1 is electrically connected to the negative electrode of the polar capacitor EC3, the other end of the resistor R4, the other end of the resistor R7 and the negative input end of the receiving module, and is electrically connected to an external device as an output negative electrode.

[0020] Furthermore, the receiving module includes a receiving chip REC1,

[0021] Pin 1 of the receiving chip REC1 is electrically connected to the cathode of the diode D1 as a positive input terminal, and pin 2 of the receiving chip REC1 is electrically connected to pin 6 of the transformer T1 as a negative input terminal; pins D1 and D2 of the receiving chip REC1 are electrically connected to the signal input terminal of the relay control module as control terminals.

[0022] Further, the relay control module includes a relay J1A, a relay J2A, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a diode D3, a diode D4, a diode D5, a diode D6 and a resistor R8;

[0023] The cathode of the diode D1 is electrically connected to one end of the resistor R8, and the other end of the resistor R8 is electrically connected to the collector of the transistor Q1, the collector of the transistor Q2, the collector of the transistor Q3, and the collector of the transistor Q4;

[0024] The pin D1 of the receiving chip REC1 is electrically connected to the base of the transistor Q1 and the base of the transistor Q3;

[0025] The pin D2 of the receiving chip REC1 is electrically connected to the base of the transistor Q2 and the base of the transistor Q4;

[0026] The emitter of the transistor Q1 is electrically connected to the cathode of the diode D3 and the pin 4 of the relay J1A; the emitter of the transistor Q2 is electrically connected to the cathode of the diode D4 and the pin 3 of the relay J1A; the emitter of the transistor Q3 is electrically connected to the cathode of the diode D5 and the pin 4 of the relay J2A; the emitter of the transistor Q4 is electrically connected to the cathode of the diode D6 and the pin 3 of the relay J2A; the pin 5 of the relay J1A is electrically connected to the anode of the diode D3 and the anode of the diode D4, and is electrically connected to an external device as an output cathode; the pin 5 of the relay J2A is electrically connected to the anode of the diode D5 and the anode of the diode D6, and is electrically connected to an external device as an output cathode.

[0027] Furthermore, the main switch module includes a power input interface CON1, a power output interface CON2, and switches J1B and J2B;

[0028] The power input interface CON1 and the power output interface CON2 are electrically connected to the positive and negative poles of the built-in power supply respectively, pin 1 of the power input interface CON1 is electrically connected to pin 1 of the switch J1B, and pin 2 of the switch J1B is electrically connected to pin 1 of the power input interface CON2; pin 2 of the power input interface CON1 is electrically connected to pin 1 of the switch J2B, and pin 2 of the switch J2B is electrically connected to pin 2 of the power input interface CON2; pin 3 of the power input interface CON1 is electrically connected to pin 3 of the power output interface CON2.

[0029] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0030] In this solution, the main switch module transmits a control signal to the receiving module through the wireless transmitting panel; the high-voltage rectifier input module and the power control module provide 5V1A power to the secondary side through transformer T1, and the received signal controls the on and off of the relay control module through the control signal, thereby realizing wireless on and off control of high-power electrical appliances, avoiding the need for staff to control the switch module at a fixed location, reducing the difficulty of switch control, and at the same time reducing the possibility of direct contact between staff and high voltage electricity, fully protecting the personal safety of staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a circuit diagram of the main switch module of the high-power wireless switch circuit of the utility model;

[0032] Figure 2 This is a circuit diagram of a switch control unit of the high-power wireless switch circuit of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0036] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0037] Example

[0038] Please refer to Figure 1 and Figure 2As shown, this embodiment provides a high-power wireless switch circuit, including a wireless transmission panel and a switch control unit. A main switch module and a built-in power supply are provided in the wireless transmission panel, and the main switch module is electrically connected to the built-in power supply. The switch control unit includes a high-voltage rectifier input module, a power supply control module, a transformer T1, a low-voltage filter module, a receiving module and a relay control module; the main switch module is wirelessly connected to the receiving module through the wireless transmission panel; the high-voltage rectifier input module is connected to the mains, the output end of the high-voltage rectifier input module and the control end of the power supply control module are both electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the input end of the low-voltage filter module, the output end of the low-voltage filter module is electrically connected to the power supply input end of the receiving module and the relay control module, the control end of the receiving module is electrically connected to the signal input end of the relay control module, and the output end of the relay control module is electrically connected to the external electrical appliance. The main switch module transmits the control signal to the receiving module through the wireless transmitting panel; the high-voltage rectifier input module and the power control module provide 5V1A power to the secondary side through transformer T1, and the received signal controls the on and off of the relay control module through the control signal, thereby realizing wireless on and off control of high-power electrical appliances, avoiding the need for staff to control the switch module at a fixed location, reducing the difficulty of switch control, and at the same time reducing the possibility of direct contact between staff and high voltage electricity, fully protecting the personal safety of staff.

[0039] Please refer to Figure 1 As shown, specifically, the main switch module includes a power input interface CON1, a power output interface CON2, and switches J1B and J2B. The power input interface CON1 and the power output interface CON2 are electrically connected to the positive and negative poles of the built-in power supply, respectively. Pin 1 of the power input interface CON1 is electrically connected to pin 1 of the switch J1B, and pin 2 of the switch J1B is electrically connected to pin 1 of the power input interface CON2. Pin 2 of the power input interface CON1 is electrically connected to pin 1 of the switch J2B, and pin 2 of the switch J2B is electrically connected to pin 2 of the power input interface CON2. Pin 3 of the power input interface CON1 is electrically connected to pin 3 of the power output interface CON2.

[0040] Please refer to Figure 2As shown, specifically, the high-voltage rectifier input module includes a fuse F1, a common-mode inductor L1, a rectifier bridge D5, a polarized capacitor EC1 and a resistor R6. One end of the fuse F1 is electrically connected to the live wire, the other end of the fuse F1 is electrically connected to pin 1 of the common-mode inductor L1, and pin 4 of the common-mode inductor L1 is electrically connected to the neutral line. Pin 2 of the common-mode inductor L1 is electrically connected to pin 2 of the rectifier bridge D5, and pin 3 of the common-mode inductor L1 is electrically connected to pin 4 of the rectifier bridge D5. Pin 1 of the rectifier bridge D5 is electrically connected to the positive electrode of the polarized capacitor EC1, one end of the resistor R6 and pin 1 of the transformer T1, the other end of the resistor R6 is electrically connected to the power control module, and pin 3 of the rectifier bridge D5 and the negative electrode of the polarized capacitor EC1 are both grounded.

[0041] Specifically, the power control module includes a control chip U1, a diode D2, a jumper J3, a polarized capacitor EC2, and resistors R1, R2, and R5. Pins 5 and 6 of the control chip U1 are electrically connected to pin 2 of the transformer T1. Pin 5 of the transformer T1 is electrically connected to one end of the jumper J3, and the other end of the jumper J3 is electrically connected to the positive electrode of the diode D2 and one end of the resistor R1. The negative electrode of the diode D2 is electrically connected to the high-voltage rectifier input module, pin 2, pin 3, pin 4 of the control chip U1, one end of the resistor R5, and the positive electrode of the polarized capacitor EC2, that is, the negative electrode of the diode D2 is electrically connected to the other end of the resistor R6, pin 2, pin 3, pin 4 of the control chip U1, one end of the resistor R5, and the positive electrode of the polarized capacitor EC2. The other end of the resistor R1 is electrically connected to pin 1 of the control chip U1 and one end of the resistor R2. The other end of the resistor R2, the other end of the resistor R5, the negative electrode of the polarized capacitor EC2, the pin 8 of the control chip U1 and the pin 4 of the transformer T1 are all grounded. In this embodiment, the model of the control chip U1 is LP3773CH.

[0042] Specifically, the low-voltage filter module includes a diode D1, a light-emitting diode LED1, a polarized capacitor EC3, and resistors R4 and R7. Pin 10 of the transformer T1 is electrically connected to the positive pole of the diode D1, and the negative pole of the diode D1 is electrically connected to the positive pole of the polarized capacitor EC3, one end of the resistor R4, the positive pole of the light-emitting diode LED1, the positive input end of the receiving module, and the relay control module, and is electrically connected to the external device as the output positive pole. The negative pole of the light-emitting diode LED1 is electrically connected to one end of the resistor R7, and pin 6 of the transformer T1 is electrically connected to the negative pole of the polarized capacitor EC3, the other end of the resistor R4, the other end of the resistor R7, and the negative input end of the receiving module, and is electrically connected to the external device as the output negative pole. The polarized capacitor EC3 filters the low-voltage electricity, the resistor R4 acts as a dummy load, and the light-emitting diode LED1 indicates the output state.

[0043] The receiving module includes a receiving chip REC1, wherein pin 1 of the receiving chip REC1 is electrically connected to the cathode of the diode D1 as a positive input terminal, and pin 2 of the receiving chip REC1 is electrically connected to pin 6 of the transformer T1 as a negative input terminal. Pins D1 and D2 of the receiving chip REC1 are electrically connected to the signal input terminal of the relay control module as control terminals. In this embodiment, the model of the receiving chip REC1 is YRM01.

[0044] The relay control module includes relay J1A, relay J2A, transistor Q1, transistor Q2, transistor Q3, transistor Q4, diode D3, diode D4, diode D5, diode D6 and resistor R8. The cathode of diode D1 is electrically connected to one end of resistor R8, and the other end of resistor R8 is electrically connected to the collector of transistor Q1, the collector of transistor Q2, the collector of transistor Q3 and the collector of transistor Q4. Pin D1 of receiving chip REC1 is electrically connected to the base of transistor Q1 and the base of transistor Q3; pin D2 of receiving chip REC1 is electrically connected to the base of transistor Q2 and the base of transistor Q4. The emitter of transistor Q1 is electrically connected to the cathode of diode D3 and pin 4 of relay J1A; the emitter of transistor Q2 is electrically connected to the cathode of diode D4 and pin 3 of relay J1A; the emitter of transistor Q3 is electrically connected to the cathode of diode D5 and pin 4 of relay J2A; the emitter of transistor Q4 is electrically connected to the cathode of diode D6 and pin 3 of relay J2A. Pin 5 of relay J1A is electrically connected to the anode of diode D3 and the anode of diode D4, and is electrically connected to an external device as an output cathode. Pin 5 of relay J2A is electrically connected to the anode of diode D5 and the anode of diode D6, and is electrically connected to an external device as an output cathode.

[0045] The mains power 220VAC passes through fuse F1, common mode inductor L1, rectifier bridge D5, polarized capacitor EC1, polarized capacitor EC2, polarized capacitor EC3, transformer T1, control chip U1, resistor R1, resistor R2, resistor R5, resistor R6, diode D1, diode D2, etc. to form a 5V / 1A switching power supply to power the receiving module and relay control module.

[0046] When the switches J1B and J2B are closed, the wireless transmission panel outputs a start control signal to the receiving module. When the receiving module receives a 433MHz signal, the pin D1 of the receiving chip REC1 outputs a high level, the pin D2 of the receiving chip REC1 outputs a low level, the transistors Q1 and Q3 are turned on, the relays J1B and J2B are energized, and the electrical equipment is powered on.

[0047] When the switches J1B and J2B are disconnected, the wireless transmission panel outputs a shutdown control signal to the receiving module. When the receiving module receives a 433MHz signal, the pin D1 of the receiving chip REC1 outputs a low level, the pin D2 of the receiving chip REC1 outputs a high level, the transistors Q2 and Q4 are turned on, the relays J1B and J2B are turned off, and the power-consuming equipment is powered off.

[0048] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A high-power wireless switch circuit, characterized in that: Including wireless transmission panel and switch control unit, The wireless transmission panel is provided with a main switch module and a built-in power supply, and the main switch module is electrically connected to the built-in power supply. The switch control unit includes a high-voltage rectifier input module, a power supply control module, a transformer T1, a low-voltage filter module, a receiving module and a relay control module; The main switch module is wirelessly connected to the receiving module via a wireless transmitting panel; The high-voltage rectifier input module is connected to the mains, the output end of the high-voltage rectifier input module and the control end of the power control module are both electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the input end of the low-voltage filter module, the output end of the low-voltage filter module is electrically connected to the power input end of the receiving module and the relay control module, the control end of the receiving module is electrically connected to the signal input end of the relay control module, and the output end of the relay control module is electrically connected to an external electrical appliance.

2. The high-power wireless switch circuit according to claim 1, characterized in that: The high-voltage rectifier input module includes a fuse F1, a common-mode inductor L1, a rectifier bridge D5, a polarized capacitor EC1 and a resistor R6; One end of the fuse F1 is electrically connected to the live wire, the other end of the fuse F1 is electrically connected to pin 1 of the common-mode inductor L1, pin 4 of the common-mode inductor L1 is electrically connected to the neutral line, pin 2 of the common-mode inductor L1 is electrically connected to pin 2 of the rectifier bridge D5, and pin 3 of the common-mode inductor L1 is electrically connected to pin 4 of the rectifier bridge D5; pin 1 of the rectifier bridge D5 is electrically connected to the positive electrode of the polar capacitor EC1, one end of the resistor R6 and pin 1 of the transformer T1, the other end of the resistor R6 is electrically connected to the power control module, and pin 3 of the rectifier bridge D5 and the negative electrode of the polar capacitor EC1 are both grounded.

3. The high-power wireless switch circuit according to claim 1, characterized in that: The power control module includes a control chip U1, a diode D2, a jumper J3, a polarized capacitor EC2, and resistors R1, R2, and R5; Pins 5 and 6 of the control chip U1 are electrically connected to pin 2 of the transformer T1. Pin 5 of the transformer T1 is electrically connected to one end of the jumper J3, the other end of the jumper J3 is electrically connected to the positive electrode of the diode D2 and one end of the resistor R1, the negative electrode of the diode D2 is electrically connected to the high-voltage rectifier input module, pin 2, pin 3, pin 4 of the control chip U1, one end of the resistor R5 and the positive electrode of the polarized capacitor EC2, and the other end of the resistor R1 is electrically connected to pin 1 of the control chip U1 and one end of the resistor R2; The other end of the resistor R2, the other end of the resistor R5, the negative electrode of the polarized capacitor EC2, the pin 8 of the control chip U1 and the pin 4 of the transformer T1 are all grounded.

4. The high-power wireless switch circuit according to claim 3, characterized in that: The model of the control chip U1 is LP3773CH.

5. The high-power wireless switch circuit according to claim 1, characterized in that: The low voltage filter module includes a diode D1, a light emitting diode LED1, a polarized capacitor EC3, and resistors R4 and R7; Pin 10 of the transformer T1 is electrically connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 is electrically connected to the positive electrode of the polar capacitor EC3, one end of the resistor R4, the positive electrode of the light-emitting diode LED1, the positive input end of the receiving module and the relay control module, and is electrically connected to an external device as an output positive electrode; the negative electrode of the light-emitting diode LED1 is electrically connected to one end of the resistor R7, and the pin 6 of the transformer T1 is electrically connected to the negative electrode of the polar capacitor EC3, the other end of the resistor R4, the other end of the resistor R7 and the negative input end of the receiving module, and is electrically connected to an external device as an output negative electrode.

6. The high-power wireless switch circuit according to claim 5, characterized in that: The receiving module includes a receiving chip REC1, Pin 1 of the receiving chip REC1 is electrically connected to the cathode of the diode D1 as a positive input terminal, and pin 2 of the receiving chip REC1 is electrically connected to pin 6 of the transformer T1 as a negative input terminal; pins D1 and D2 of the receiving chip REC1 are electrically connected to the signal input terminal of the relay control module as control terminals.

7. The high-power wireless switch circuit according to claim 6, characterized in that: The relay control module includes a relay J1A, a relay J2A, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a diode D3, a diode D4, a diode D5, a diode D6 and a resistor R8; The cathode of the diode D1 is electrically connected to one end of the resistor R8, and the other end of the resistor R8 is electrically connected to the collector of the transistor Q1, the collector of the transistor Q2, the collector of the transistor Q3, and the collector of the transistor Q4; The pin D1 of the receiving chip REC1 is electrically connected to the base of the transistor Q1 and the base of the transistor Q3; The pin D2 of the receiving chip REC1 is electrically connected to the base of the transistor Q2 and the base of the transistor Q4; The emitter of the transistor Q1 is electrically connected to the cathode of the diode D3 and the pin 4 of the relay J1A; the emitter of the transistor Q2 is electrically connected to the cathode of the diode D4 and the pin 3 of the relay J1A; the emitter of the transistor Q3 is electrically connected to the cathode of the diode D5 and the pin 4 of the relay J2A; the emitter of the transistor Q4 is electrically connected to the cathode of the diode D6 and the pin 3 of the relay J2A; the pin 5 of the relay J1A is electrically connected to the anode of the diode D3 and the anode of the diode D4, and is electrically connected to an external device as an output cathode; the pin 5 of the relay J2A is electrically connected to the anode of the diode D5 and the anode of the diode D6, and is electrically connected to an external device as an output cathode.

8. The high-power wireless switch circuit according to claim 1, characterized in that: The main switch module includes a power input interface CON1, a power output interface CON2, and switches J1B and J2B; The power input interface CON1 and the power output interface CON2 are electrically connected to the positive and negative poles of the built-in power supply respectively, pin 1 of the power input interface CON1 is electrically connected to pin 1 of the switch J1B, and pin 2 of the switch J1B is electrically connected to pin 1 of the power input interface CON2; pin 2 of the power input interface CON1 is electrically connected to pin 1 of the switch J2B, and pin 2 of the switch J2B is electrically connected to pin 2 of the power input interface CON2; pin 3 of the power input interface CON1 is electrically connected to pin 3 of the power output interface CON2.

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