New energy charging pile LED breathing lamp control circuit based on RS485 control

Abstract

The utility model provides a new energy charging pile LED breathing lamp control circuit based on RS485 control, a 12V-pin of a power supply interface is grounded, a 12V + pin of the power supply interface is respectively connected with a first NMOS tube group and a DC-DC power supply chip U2, a resistor R5 and a resistor R11 are sequentially arranged between the 12V + pin of the power supply interface and the DC-DC power supply chip U2, a second NMOS tube group is arranged between the output end of the first NMOS tube group and the DC-DC power supply chip U2, and the resistor R11 is connected with the resistor R5 and the resistor R11. An inductor L1 is arranged at the output end of the second NMOS tube group, an energy storage capacitor group is arranged at the output end of the inductor L1, the output end of the energy storage capacitor group is connected with the input end of the second step-down power supply circuit, the DC-DC power supply chip U2 plays a role in step-down, the first NMOS tube group and the second NMOS tube group play a role in turn-off control, and the resistor R5 and the resistor R11 play a role in drive enabling. The inductor L1 plays a role in converting electric energy into magnetic energy, the energy storage capacitor bank plays a role in storing energy, the converted power is higher through the first step-down power supply circuit, the power of the breathing lamp is greatly improved, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of electricity, and more specifically, to a new energy charging pile LED breathing light control circuit based on RS485 control. Background Art

[0002] The function of a charging pile is similar to that of a gas pump in a gas station. It can be fixed on the ground or on a wall and installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations. It can charge various types of electric vehicles according to different voltage levels. The input end of the charging pile is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging electric vehicles. Charging piles generally provide two charging methods: conventional charging and fast charging.

[0003] The patent closest to the prior art, announcement number: CN215682687U, a control circuit for the LED indicator light of a new energy vehicle charging pile, a control circuit for the LED indicator light of a new energy vehicle charging pile, through a first-level step-down circuit, a control circuit for the LED indicator light of a new energy vehicle charging pile is provided, the power supply voltage circuit is used in conjunction with a first-level step-down circuit, a second-level step-down circuit and a third-level step-down circuit, and the input voltage 24V is converted through DC-DC to 5V, 12V and 3.3V to power the LED and write a program through the main control chip circuit.

[0004] The power provided by the existing control circuit is relatively small, which limits the brightness of the LED and cannot meet the lighting needs.

[0005] In view of this, the utility model proposes a new energy charging pile LED breathing light control circuit with high power, high brightness and simple structure based on RS485 control. Utility Model Content

[0006] The utility model provides a new energy charging pile LED breathing lamp control circuit which has high power, high brightness and simple structure and is based on RS485 control.

[0007] A new energy charging pile LED breathing light control circuit based on RS485 control, including a power supply interface, a breathing light interface, a communication interface, a first step-down power supply circuit, a second step-down power supply circuit, a third step-down power supply circuit, an MCU circuit, an RS485 transceiver circuit, and a breathing light control circuit, characterized in that: the power supply interface is used to provide a 12V power supply, the power supply interface is connected to the first step-down power supply circuit, the second step-down power supply circuit, and the control circuit, the first step-down power supply circuit is used to convert the 12V power supply into a DC5V power supply, the second step-down power supply circuit is used to convert the 12V power supply into 5V, the third step-down power supply circuit is used to convert the 5V power supply into 3.3V, the output end of the second step-down power supply circuit is connected to the input end of the third step-down power supply circuit, the communication interface is bidirectionally connected to the RS485 transceiver circuit, the output end of the RS485 transceiver circuit is connected to the input end of the MCU circuit, and the output end of the MCU circuit is connected to the output end of the breathing light control circuit The input end is connected, the output end of the breathing light control circuit is connected to the breathing light interface, the third step-down power supply circuit is connected to the MCU circuit, the second step-down power supply circuit is connected to the breathing light control circuit, the first step-down power supply circuit includes a DC-DC power supply chip U2, a first NMOS tube group, a second NMOS tube group, an inductor L1, an energy storage capacitor group, a resistor R5, and a resistor R11. The 12V-pin of the power supply interface is grounded, and the 12V+pin of the power supply interface is connected to the first NMOS tube group and the DC-DC power supply chip U2 respectively. Resistors R5 and R11 are arranged between the 12V+pin of the power supply interface and the DC-DC power supply chip U2 in sequence, a second NMOS tube group is arranged between the output end of the first NMOS tube group and the DC-DC power supply chip U2, an inductor L1 is arranged at the output end of the second NMOS tube group, an energy storage capacitor group is arranged at the output end of the inductor L1, and the output end of the energy storage capacitor group is connected to the input end of the second step-down power supply circuit. The DC-DC power supply chip U2 plays a role in stepping down the voltage, the first NMOS tube group and the second NMOS tube group play a role in controlling the shutdown, the resistors R5 and R11 play a role in driving and enabling, the inductor L1 plays a role in converting electrical energy into magnetic energy, and the energy storage capacitor group plays a role in energy storage.

[0008] Furthermore, pins 1, 2, and 20 of the DC-DC power chip U2 are connected to capacitor C24, pin 3 of the DC-DC power chip U2 is connected to capacitor C25, pin 3 of the DC-DC power chip U2 is connected to capacitor C25, pin 4 of the DC-DC power chip U2 is connected to capacitor C26, and pin 5 of the DC-DC power chip U2 is connected to capacitor C27. Capacitors C24, C25, C26, and C27 all play a role of coupling filtering.

[0009] Furthermore, the 8th pin of the DC-DC power chip U2 is connected to a resistor R12 and a capacitor C28 in sequence, and the resistor R12 and the capacitor C28 play the role of feeding back network stability parameters.

[0010] Furthermore, resistors R1 and R2 are provided between the inductor L1 and the energy storage capacitor group. The input ends of resistors R1 and R2 are connected to pin 10 of the DC-DC power chip U2, and the output ends of resistors R1 and R2 are connected to pin 11 of the DC-DC power chip U2. Resistors R1 and R2 perform the functions of voltage division and feedback difference data.

[0011] Furthermore, a resistor R8 is provided between the resistors R1, R2 and the 10-pin connection of the DC-DC power chip U2, a resistor R9 is provided between the resistors R1, R2 and the 11-pin connection of the DC-DC power chip U2, and a capacitor C18 is provided between the resistors R8 and R9. The resistors R8, R9 and C18 all play a role in decoupling after sampling.

[0012] Further, the first NMOS tube group includes NMOS tube Q1 and NMOS tube Q1-1, which are connected in parallel, and the second NMOS tube group includes NMOS tube Q3 and NMOS tube Q3-1. When NMOS tube Q1 and NMOS tube Q1-1 are turned on, NMOS tube Q3 and NMOS tube Q3-1 are turned off, and when NMOS tube Q3 and NMOS tube Q3-1 are turned on, NMOS tube Q1 and NMOS tube Q1-1 are turned off.

[0013] Furthermore, a resistor R3 is provided between the first NMOS tube group and the 17th pin of the DC-DC power chip U2, and the resistor R3 plays a role in driving the first NMOS tube group. A resistor R6 is provided between the second NMOS tube group and the 14th pin of the DC-DC power chip U2, and the resistor R6 plays a role in driving the second NMOS tube group. A capacitor C12 is provided between the first NMOS tube group and the 15th and 16th pins of the DC-DC power chip U2, and a capacitor C13 is provided between the second NMOS tube group and the 13th pin of the DC-DC power chip U2. Both the capacitor C12 and the capacitor C13 play a coupling role.

[0014] Furthermore, the first step-down power supply circuit is also connected to an NMOS tube Q2, and the NMOS tube Q2 plays a role in preventing reverse connection.

[0015] Furthermore, the specification of the DC-DC power supply chip U2 is PL56001.

[0016] Furthermore, the RS485 transceiver circuit includes an RS485 chip U4, a voltage regulator tube D1, a voltage regulator tube D2, and a voltage regulator tube D3. Pin 2 of the communication interface J3 is connected to pin 6 of the RS485 chip U4, and pin 3 of the communication interface J3 is connected to pin 7 of the RS485 chip U4. Pin 6 of the RS485 chip U4 and pin 7 of the RS485 chip U4 are sequentially connected with voltage regulator tubes D1, D2, and D3. The voltage regulator tubes D1, D2, and D3 play a role in preventing surges, preventing electric shocks, and absorbing peak voltages.

[0017] Beneficial effects of the utility model: The utility model proposes a new energy charging pile LED breathing light control circuit based on RS485 control, the 12V-pin of the power supply interface is grounded, the 12V+pin of the power supply interface is connected to the first NMOS tube group and the DC-DC power chip U2 respectively, and resistors R5 and R11 are arranged between the 12V+pin of the power supply interface and the DC-DC power chip U2 in sequence, and a second NMOS tube group is arranged between the output end of the first NMOS tube group and the DC-DC power chip U2, and an inductor L1 is arranged at the output end of the second NMOS tube group, and an energy storage capacitor group is arranged at the output end of the inductor L1, and the output end of the energy storage capacitor group is connected to the input end of the second step-down power supply circuit. The DC-DC power chip U2 plays a step-down role, the first NMOS tube group and the second NMOS tube group play a role in controlling the shutdown, the resistors R5 and R11 play a driving enabling role, the inductor L1 plays a role in converting electrical energy into magnetic energy, and the energy storage capacitor group plays an energy storage role. Through the first step-down power supply circuit, the power after conversion is higher, which greatly improves the power of the breathing light, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of the first step-down power supply circuit of a new energy charging pile LED breathing light control circuit based on RS485 control in the present application.

[0019] Figure 2 This is a structural schematic diagram of the connection between the MCU circuit, breathing light control circuit, and RS485 transceiver circuit of a new energy charging pile LED breathing light control circuit based on RS485 control in this application.

[0020] Figure 3 This is a structural schematic diagram of the second step-down power supply circuit of a new energy charging pile LED breathing light control circuit based on RS485 control in the present application.

[0021] Figure 4 This is a structural schematic diagram of the third step-down power supply circuit of a new energy charging pile LED breathing light control circuit based on RS485 control in this application.

[0022] Figure 5This is a structural schematic diagram of the power supply interface, breathing light interface, and communication interface of a new energy charging pile LED breathing light control circuit based on RS485 control in this application.

[0023] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] The following examples are described to assist the understanding of the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0025] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including within a single system or component).

[0026] At the same time, the connections between components or systems are not intended to be limited to direct connections, rather, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections. Embodiment 1:

[0027] like Figure 1 As shown in FIG. 1 , it is a structural schematic diagram of a first step-down power supply circuit of a new energy charging pile LED breathing light control circuit based on RS485 control of the present application; Figure 2 As shown in FIG. 1 , it is a structural diagram of the connection of the MCU circuit, the breathing light control circuit, and the RS485 transceiver circuit of the new energy charging pile LED breathing light control circuit based on RS485 control of the present application; Figure 3 As shown, it is a structural schematic diagram of the second step-down power supply circuit of the new energy charging pile LED breathing light control circuit based on RS485 control of the present application; Figure 4 As shown in FIG, this is a structural diagram of the third step-down power supply circuit of a new energy charging pile LED breathing light control circuit based on RS485 control of the present application; As shown in FIG5, this is a structural diagram of the power supply interface, breathing light interface, and communication interface of a new energy charging pile LED breathing light control circuit based on RS485 control of the present application.

[0028] A new energy charging pile LED breathing light control circuit based on RS485 control, including a power supply interface, a breathing light interface, a communication interface, a first step-down power supply circuit, a second step-down power supply circuit, a third step-down power supply circuit, an MCU circuit, an RS485 transceiver circuit, and a breathing light control circuit. The power supply interface is used to provide a 12V power supply. The power supply interface is connected to the first step-down power supply circuit, the second step-down power supply circuit, and the control circuit. The first step-down power supply circuit is used to convert the 12V power supply into a DC5V power supply. The second step-down power supply circuit is used to convert the 12V power supply into 5V. The third step-down power supply circuit is used to convert the 5V power supply into 3.3V. The output end of the second step-down power supply circuit is connected to the input end of the third step-down power supply circuit. The communication interface is bidirectionally connected to the RS485 transceiver circuit. The output end of the RS485 transceiver circuit is connected to the input end of the MCU circuit. The output end of the MCU circuit is connected to the input end of the breathing light control circuit. The output end of the lamp absorbing control circuit is connected to the breathing lamp interface, the third step-down power supply circuit is connected to the MCU circuit, and the second step-down power supply circuit is connected to the breathing lamp control circuit, and is characterized in that: the first step-down power supply circuit includes a DC-DC power supply chip U2, a first NMOS tube group, a second NMOS tube group, an inductor L1, an energy storage capacitor group, a resistor R5, and a resistor R11. The 12V-pin of the power supply interface is grounded, and the 12V+pin of the power supply interface is respectively connected to the first NMOS tube group and the DC-DC power supply chip U2. Resistors R5 and R11 are arranged between the 12V+pin of the power supply interface and the DC-DC power supply chip U2 in sequence. A second NMOS tube group is arranged between the output end of the first NMOS tube group and the DC-DC power supply chip U2. An inductor L1 is arranged at the output end of the second NMOS tube group. An energy storage capacitor group is arranged at the output end of the inductor L1. The output end of the energy storage capacitor group is connected to the input end of the second step-down power supply circuit. The DC-DC power supply chip U2 plays a role in stepping down the voltage, the first NMOS tube group and the second NMOS tube group play a role in controlling the shutdown, the resistors R5 and R11 play a role in driving and enabling, the inductor L1 plays a role in converting electrical energy into magnetic energy, and the energy storage capacitor group plays a role in energy storage.

[0029] Pin 1, pin 2, and pin 20 of the DC-DC power chip U2 are connected to capacitor C24, pin 3 of the DC-DC power chip U2 is connected to capacitor C25, pin 3 of the DC-DC power chip U2 is connected to capacitor C25, pin 4 of the DC-DC power chip U2 is connected to capacitor C26, and pin 5 of the DC-DC power chip U2 is connected to capacitor C27. Capacitors C24, C25, C26, and C27 all play a role of coupling filtering.

[0030] Pin 8 of the DC-DC power chip U2 is connected to a resistor R12 and a capacitor C28 in sequence, and the resistor R12 and the capacitor C28 play the role of feeding back network stability parameters.

[0031] Resistors R1 and R2 are also provided between the inductor L1 and the energy storage capacitor group. The input ends of resistors R1 and R2 are connected to pin 10 of the DC-DC power supply chip U2, and the output ends of resistors R1 and R2 are connected to pin 11 of the DC-DC power supply chip U2. Resistors R1 and R2 perform the function of voltage division and feedback difference data.

[0032] A resistor R8 is provided between the resistors R1, R2 and the 10-pin connection of the DC-DC power chip U2, a resistor R9 is provided between the resistors R1, R2 and the 11-pin connection of the DC-DC power chip U2, and a capacitor C18 is provided between the resistors R8 and R9. The resistors R8, R9 and C18 all play the role of decoupling after sampling.

[0033] The first NMOS tube group includes NMOS tube Q1 and NMOS tube Q1-1, which are connected in parallel. The second NMOS tube group includes NMOS tube Q3 and NMOS tube Q3-1. When NMOS tube Q1 and NMOS tube Q1-1 are turned on, NMOS tube Q3 and NMOS tube Q3-1 are turned off. When NMOS tube Q3 and NMOS tube Q3-1 are turned on, NMOS tube Q1 and NMOS tube Q1-1 are turned off.

[0034] A resistor R3 is provided between the first NMOS tube group and the 17th pin of the DC-DC power chip U2, and the resistor R3 plays a role in driving the first NMOS tube group. A resistor R6 is provided between the second NMOS tube group and the 14th pin of the DC-DC power chip U2, and the resistor R6 plays a role in driving the second NMOS tube group. A capacitor C12 is provided between the first NMOS tube group and the 15th and 16th pins of the DC-DC power chip U2, and a capacitor C13 is provided between the second NMOS tube group and the 13th pin of the DC-DC power chip U2, and both capacitors C12 and C13 play a coupling role.

[0035] The first step-down power supply circuit is also connected to an NMOS transistor Q2, which plays a role in preventing reverse connection.

[0036] The specification of the DC-DC power supply chip U2 is PL56001.

[0037] The RS485 transceiver circuit includes an RS485 chip U4, a voltage regulator tube D1, a voltage regulator tube D2, and a voltage regulator tube D3. Pin 2 of the communication interface J3 is connected to pin 6 of the RS485 chip U4, and pin 3 of the communication interface J3 is connected to pin 7 of the RS485 chip U4. Pin 6 of the RS485 chip U4 and pin 7 of the RS485 chip U4 are sequentially connected with voltage regulator tubes D1, D2, and D3. The voltage regulator tubes D1, D2, and D3 play the role of preventing surges, preventing electric shocks, and absorbing peak voltages.

[0038] Beneficial effects of the utility model: The utility model proposes a new energy charging pile LED breathing light control circuit based on RS485 control, the 12V-pin of the power supply interface is grounded, the 12V+pin of the power supply interface is connected to the first NMOS tube group and the DC-DC power chip U2 respectively, and resistors R5 and R11 are arranged between the 12V+pin of the power supply interface and the DC-DC power chip U2 in sequence, and a second NMOS tube group is arranged between the output end of the first NMOS tube group and the DC-DC power chip U2, and an inductor L1 is arranged at the output end of the second NMOS tube group, and an energy storage capacitor group is arranged at the output end of the inductor L1, and the output end of the energy storage capacitor group is connected to the input end of the second step-down power supply circuit. The DC-DC power chip U2 plays a step-down role, the first NMOS tube group and the second NMOS tube group play a role in controlling the shutdown, the resistors R5 and R11 play a driving enabling role, the inductor L1 plays a role in converting electrical energy into magnetic energy, and the energy storage capacitor group plays an energy storage role. Through the first step-down power supply circuit, the power after conversion is higher, which greatly improves the power of the breathing light, and the structure is simple.

[0039] Although the present application has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art, and several modifications and improvements may be made without departing from the concept of the present application, all of which belong to the protection scope of the present application. The multiple aspects and embodiments disclosed in the present application are only for illustration and are not intended to limit the present application. The actual protection scope of the present application shall be subject to the claims.

Claims

1. A new energy charging pile LED breathing light control circuit based on RS485 control, including a power supply interface, a breathing light interface, a communication interface, a first step-down power supply circuit, a second step-down power supply circuit, a third step-down power supply circuit, an MCU circuit, an RS485 transceiver circuit, and a breathing light control circuit, characterized in that: The power supply interface is used to provide a 12V power supply. The power supply interface is connected to the first step-down power supply circuit, the second step-down power supply circuit, and the control circuit. The first step-down power supply circuit is used to convert the 12V power supply into a DC5V power supply. The second step-down power supply circuit is used to convert the 12V power supply into 5V. The third step-down power supply circuit is used to convert the 5V power supply into 3.3V. The output end of the second step-down power supply circuit is connected to the input end of the third step-down power supply circuit. The communication interface is bidirectionally connected to the RS485 transceiver circuit. The output end of the RS485 transceiver circuit is connected to the input end of the MCU circuit. The output end of the MCU circuit is connected to the input end of the breathing light control circuit. The output end of the breathing light control circuit is connected to the breathing light interface. The third step-down power supply circuit is connected to the MCU circuit. The second step-down power supply circuit is connected to the breathing light control circuit. The first step-down power supply circuit includes a DC-DC power supply chip U2, a first NMOS tube group, and a second NMOS The tube group, inductor L1, energy storage capacitor group, resistor R5, and resistor R11, the 12V- pin of the power supply interface is grounded, and the 12V+ pin of the power supply interface is connected to the first NMOS tube group and the DC-DC power chip U2 respectively. Resistors R5 and R11 are arranged between the 12V+ pin of the power supply interface and the DC-DC power chip U2 in sequence, a second NMOS tube group is arranged between the output end of the first NMOS tube group and the DC-DC power chip U2, an inductor L1 is arranged at the output end of the second NMOS tube group, an energy storage capacitor group is arranged at the output end of the inductor L1, and the output end of the energy storage capacitor group is connected to the input end of the second step-down power supply circuit, the DC-DC power chip U2 plays a step-down role, the first NMOS tube group and the second NMOS tube group play a role in controlling shutdown, resistors R5 and R11 play a driving enabling role, the inductor L1 plays a role in converting electrical energy into magnetic energy, and the energy storage capacitor group plays a role in energy storage.

2. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: Pin 1, pin 2, and pin 20 of the DC-DC power chip U2 are connected to capacitor C24, pin 3 of the DC-DC power chip U2 is connected to capacitor C25, pin 3 of the DC-DC power chip U2 is connected to capacitor C25, pin 4 of the DC-DC power chip U2 is connected to capacitor C26, and pin 5 of the DC-DC power chip U2 is connected to capacitor C27. Capacitors C24, C25, C26, and C27 all play a role of coupling filtering.

3. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: Pin 8 of the DC-DC power chip U2 is connected to a resistor R12 and a capacitor C28 in sequence, and the resistor R12 and the capacitor C28 play the role of feeding back network stability parameters.

4. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: Resistors R1 and R2 are also provided between the inductor L1 and the energy storage capacitor group. The input ends of resistors R1 and R2 are connected to pin 10 of the DC-DC power supply chip U2, and the output ends of resistors R1 and R2 are connected to pin 11 of the DC-DC power supply chip U2. Resistors R1 and R2 perform the function of voltage division and feedback difference data.

5. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: A resistor R8 is provided between the resistors R1, R2 and the 10-pin connection of the DC-DC power chip U2, a resistor R9 is provided between the resistors R1, R2 and the 11-pin connection of the DC-DC power chip U2, and a capacitor C18 is provided between the resistors R8 and R9. The resistors R8, R9 and C18 all play the role of decoupling after sampling.

6. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: The first NMOS tube group includes NMOS tube Q1 and NMOS tube Q1-1, which are connected in parallel. The second NMOS tube group includes NMOS tube Q3 and NMOS tube Q3-1. When NMOS tube Q1 and NMOS tube Q1-1 are turned on, NMOS tube Q3 and NMOS tube Q3-1 are turned off. When NMOS tube Q3 and NMOS tube Q3-1 are turned on, NMOS tube Q1 and NMOS tube Q1-1 are turned off.

7. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: A resistor R3 is provided between the first NMOS tube group and the 17th pin of the DC-DC power chip U2, and the resistor R3 plays a role in driving the first NMOS tube group. A resistor R6 is provided between the second NMOS tube group and the 14th pin of the DC-DC power chip U2, and the resistor R6 plays a role in driving the second NMOS tube group. A capacitor C12 is provided between the first NMOS tube group and the 15th and 16th pins of the DC-DC power chip U2, and a capacitor C13 is provided between the second NMOS tube group and the 13th pin of the DC-DC power chip U2, and both capacitors C12 and C13 play a coupling role.

8. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: The first step-down power supply circuit is also connected to an NMOS transistor Q2, which plays a role in preventing reverse connection.

9. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: The specification of the DC-DC power supply chip U2 is PL56001.

10. The new energy charging pile LED breathing light control circuit based on RS485 control as claimed in claim 1, characterized in that: The RS485 transceiver circuit includes an RS485 chip U4, a voltage regulator tube D1, a voltage regulator tube D2, and a voltage regulator tube D3. Pin 2 of the communication interface J3 is connected to pin 6 of the RS485 chip U4, and pin 3 of the communication interface J3 is connected to pin 7 of the RS485 chip U4. Pin 6 of the RS485 chip U4 and pin 7 of the RS485 chip U4 are sequentially connected with voltage regulator tubes D1, D2, and D3. The voltage regulator tubes D1, D2, and D3 play the role of preventing surges, preventing electric shocks, and absorbing peak voltages.

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