An alternating current load control circuit

Abstract

The application discloses an alternating current load control circuit, which comprises a control module, a load port, MOS tubes QA1 and QA2 and an isolation driving module. The MOS tubes QA1 and QA2 are arranged between the load port and a commercial power input port. The MOS tubes are used to replace conventional thyristors to control the power supply of external alternating current loads. The control module is connected with the isolation driving module. The isolation driving module is connected with the gate of the MOS tube QA1 and the gate of the MOS tube QA2 respectively. The control module realizes the isolation driving control function of the MOS tubes QA1 and QA2 through the isolation driving module, thereby improving the safety and reliability of the control circuit.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and more specifically to an AC load control circuit. Background Technology

[0002] Currently, there are various types of electric kettles on the market, but all of them essentially use the principle of electric heating to achieve their basic function, using alternating current to power the heating element inside the kettle to generate heat. Existing technology includes a heating power control function, which is mainly implemented using a silicon controlled rectifier (SCR) and its peripheral circuitry. In regions where the mains voltage is 120V, for the same heating power, the current amplitude of the electric kettle is much greater. Since there is a voltage difference when the SCR is turned on, a large amount of heat is generated during the SCR's operation. To prevent damage, technicians need to equip the SCR with a heat sink of a certain size.

[0003] To address the aforementioned technical issues, engineers have replaced thyristors with MOSFETs. MOSFETs have low on-resistance and low heat dissipation during power-on. In existing technologies, MOSFET drive control schemes for AC load applications commonly employ a rectifier bridge followed by optocoupler isolation to drive the MOSFET, enabling the controller and MOSFET to control the heating element with DC power. This approach has relatively low energy efficiency, high cost, and complex circuitry. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the purpose of this invention is to provide an AC load control circuit.

[0005] The technical solution adopted by this invention to solve the problem is: An AC load control circuit, comprising: Control module; Load port, used to connect external AC loads; MOSFETs QA1 and QA2 are disposed between the load port and the mains input port. The drain of MOSFET QA1 is connected to the load port, the source of MOSFET QA1 is connected to the source of MOSFET QA2, and the drain of MOSFET QA2 is connected to the mains input port. An isolation drive module is disposed between the control module and the MOS transistors QA1 and QA2. The control module is connected to the isolation drive module, and the isolation drive module is connected to the gate of the MOS transistors QA1 and QA2 respectively. The control module performs isolation drive on the MOS transistors QA1 and QA2 through the isolation drive module.

[0006] As a further improvement to the above technical solution, the isolation drive module includes a flyback isolation unit and a drive unit. The control module is connected to the flyback isolation unit, the flyback isolation unit is connected to the drive unit, and the drive unit is connected to the gate of the MOS transistor QA1 and the gate of the MOS transistor QA2, respectively.

[0007] As a further improvement to the above technical solution, the flyback isolation unit includes an isolation transformer, resistors RA1, RA2, and RA3, capacitor CA1, MOSFET QA3, and diode DA1. The isolation transformer is configured with a first winding LA1 and a second winding LA2, and the control module is configured with a first connection terminal. The first connection terminal of the control module is connected to the gate of the MOSFET QA3 through the resistor RA1. The gate of the MOSFET QA3 is connected to its source through the resistor RA2. The source of the MOSFET QA3 is connected to ground. The drain of the MOSFET QA3 is connected to the anode of the diode DA1. The cathode of the diode DA1 is connected to one end of the first winding LA1 of the isolation transformer through the capacitor CA1. The cathode of the diode DA1 is connected to the power supply terminal through the capacitor CA1. The resistor RA3 is connected in parallel with the capacitor CA1. The other end of the first winding LA1 of the isolation transformer is connected to the drain of the MOSFET QA3. The second winding LA2 of the isolation transformer is connected to the drive unit.

[0008] As a further improvement to the above technical solution, the driving unit includes diode DA2, diode DA3, Zener diode DA4, Zener diode DA5, MOSFET QA4, MOSFET QA5, capacitor CA2, capacitor CA3, capacitor CA4, capacitor CA5, capacitor CA6, resistor RA4, resistor RA5, resistor RA6, resistor RA7, resistor RA8, resistor RA9 and resistor RA10. One end of the second winding LA2 of the isolation transformer is connected to ground. The other end of the second winding LA2 is connected to the anodes of diodes DA2 and DA3. The cathode of diode DA2 is connected to the gate of MOSFET QA4 through resistor RA4. The gate of MOSFET QA4 is connected to its source through resistor RA5. The source of MOSFET QA4 is connected to ground. Capacitor CA2 is connected in parallel with resistor RA5. The anode of Zener diode DA4 is connected to the source of MOSFET QA4. The cathode of Zener diode DA4 is connected to the gate of MOSFET QA4. The drain of MOSFET QA4 is connected to the gate of MOSFET QA5. The gate of MOSFET QA5 is connected to its source through capacitor CA3. The source of MOSFET QA5 is connected to the source of MOSFET QA4 and the anode of Zener diode DA5. The drain of MOSFET QA5 is connected to the negative terminal of Zener diode DA5 through resistor RA7. The drain of MOSFET QA4 is connected to the negative terminal of Zener diode DA5 through resistor RA6. The negative terminal of diode DA3 is connected to the negative terminal of Zener diode DA5 through resistor RA8. The negative terminal of Zener diode DA5 is connected to ground through capacitor CA4. The negative terminal of Zener diode DA5 is connected to the gate of MOSFET QA1 and the gate of MOSFET QA2 through resistor RA9. One end of resistor RA10 is connected to the gate of MOSFET QA2, and the other end of resistor RA10 is connected to the positive terminal of Zener diode DA5. The gate of MOSFET QA1 is connected to its source and the positive terminal of Zener diode DA5 through capacitor CA5. The gate of MOSFET QA2 is connected to its source and the positive terminal of Zener diode DA5 through capacitor CA6.

[0009] As a further improvement to the above technical solution, the control circuit also includes a power supply module, which is connected to both the control module and the isolation drive module.

[0010] As a further improvement to the above technical solution, the power module includes a rectifier, a filter, a power chip of model KP3211BSG, capacitors CB1, CB2, CB3, and CB4, an inductor LB1, diodes DB1 and DB2, resistors RB1, RB2, RB3, and RB4, and the power chip is configured with a power supply terminal, a ground terminal, a feedback terminal, a sampling terminal, and a driving terminal. The AC input port is connected to the rectifier, which is connected to the filter. One end of the filter is connected to the drive terminal of the power chip. The sampling terminal of the power chip is connected to its ground terminal through resistor RB1. The feedback terminal of the power chip is connected to its ground terminal through capacitor CB1. The other end of the filter is connected to the anode of diode DB2. The cathode of diode DB2 is connected to the ground terminal of the power chip through resistors RB2 and RB3. The feedback terminal of the power chip is connected to resistors RB2 and RB3. The connection point is such that the negative terminal of diode DB2 is connected to the ground terminal of the power chip through capacitor CB2, the power supply terminal of the power chip is connected to its ground terminal through capacitor CB3, the ground terminal of the power chip is connected to the negative terminal of diode DB1 and one end of inductor LB1, the other end of inductor LB1 is connected to the positive terminal of diode DB2, the positive terminal of diode DB1 is connected to the positive terminal of diode DB2 through capacitor CB4, resistor RB4 is connected in parallel with capacitor CB4, and the positive terminal of diode DB1 is connected to ground.

[0011] As a further improvement to the above technical solution, this control circuit also includes a display module, which is connected to the display module.

[0012] As a further improvement to the above technical solution, the display module includes a display port, resistors RC1, RC2, RC3, and RC4, capacitors CC1 and CC2, the display port is configured with a power supply terminal, a ground terminal, a receiving terminal, and a transmitting terminal, and the control module is configured with a second connection terminal and a third connection terminal. The power supply terminal of the display port is connected to the power supply terminal, the ground terminal of the display port is connected to the ground terminal, the receiving terminal of the display port is connected to the second connection terminal of the control module through the resistor RC2, the receiving terminal of the display port is connected to the ground terminal through the capacitor CC1, the second connection terminal of the control module is connected to the power supply terminal through the resistor RC1, the transmitting terminal of the display port is connected to the third connection terminal of the control module through the resistor RC4, the third connection terminal of the control module is connected to the ground terminal through the capacitor CC2, and the third connection terminal of the control module is connected to the power supply terminal through the resistor RC3.

[0013] The beneficial effects of this invention are as follows: This technical solution is configured with a control module, a load port, MOSFETs QA1 and QA2, and an isolation drive module. MOSFETs QA1 and QA2 are located between the load port and the mains input port. MOSFETs are used to replace traditional thyristors to control the power supply to the external AC load. The control module realizes the isolation drive control function of MOSFETs QA1 and QA2 through the isolation drive module, thereby improving the safety and reliability of this control circuit. Attached Figure Description

[0014] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a circuit module framework diagram of the present invention; Figure 2 This is the circuit schematic of the isolation drive module in this invention; Figure 3 This is the circuit schematic diagram of the power supply module in this invention; Figure 4 This is a schematic diagram of the interface circuit of the display module in this invention. Detailed Implementation

[0016] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0018] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0020] Reference Figures 1 to 4 This application discloses an AC load control circuit, the first embodiment of which includes: Control module; Load port, used to connect external AC loads; MOSFETs QA1 and QA2 are disposed between the load port and the mains input port. The drain of MOSFET QA1 is connected to the load port, the source of MOSFET QA1 is connected to the source of MOSFET QA2, and the drain of MOSFET QA2 is connected to the mains input port. An isolation drive module is disposed between the control module and the MOS transistors QA1 and QA2. The control module is connected to the isolation drive module, and the isolation drive module is connected to the gate of the MOS transistors QA1 and QA2 respectively. The control module performs isolation drive on the MOS transistors QA1 and QA2 through the isolation drive module.

[0021] In this embodiment, MOSFETs QA1 and QA2 are placed between the mains input port and the load port, replacing the thyristor used in the prior art. Because MOSFETs have low on-resistance, their power consumption is low, resulting in low heat generation. Therefore, in practical applications, heat sinks are not required for MOSFETs QA1 and QA2. Furthermore, the simultaneous placement of MOSFETs QA1 and QA2 in this embodiment aims to ensure that the AC load remains energized throughout the entire AC mains cycle. In this embodiment, the control module implements isolated drive control of MOSFETs QA1 and QA2 through the isolation drive module. In practical applications, this effectively prevents damage to the control module's side circuitry, improving the safety and reliability of the control circuit.

[0022] As a further preferred embodiment, in this embodiment, the isolation drive module includes a flyback isolation unit and a drive unit. The control module is connected to the flyback isolation unit, the flyback isolation unit is connected to the drive unit, and the drive unit is connected to the gate of the MOS transistor QA1 and the gate of the MOS transistor QA2, respectively.

[0023] Specifically, in this embodiment, the flyback isolation unit includes an isolation transformer, resistors RA1, RA2, and RA3, a capacitor CA1, a MOSFET QA3, and a diode DA1. The isolation transformer is configured with a first winding LA1 and a second winding LA2, and the control module is configured with a first connection terminal. The first connection terminal of the control module is connected to the gate of the MOSFET QA3 through the resistor RA1. The gate of the MOSFET QA3 is connected to its source through the resistor RA2. The source of the MOSFET QA3 is connected to ground. The drain of the MOSFET QA3 is connected to the anode of the diode DA1. The cathode of the diode DA1 is connected to one end of the first winding LA1 of the isolation transformer through the capacitor CA1. The cathode of the diode DA1 is connected to the power supply terminal through the capacitor CA1. This power supply terminal is used to connect to low-voltage DC power. The resistor RA3 and the capacitor CA1 are connected in parallel. The other end of the first winding LA1 of the isolation transformer is connected to the drain of the MOSFET QA3. The second winding LA2 of the isolation transformer is connected to the drive unit.

[0024] In addition, in this embodiment, the driving unit includes diode DA2, diode DA3, Zener diode DA4, Zener diode DA5, MOSFET QA4, MOSFET QA5, capacitor CA2, capacitor CA3, capacitor CA4, capacitor CA5, capacitor CA6, resistor RA4, resistor RA5, resistor RA6, resistor RA7, resistor RA8, resistor RA9, and resistor RA10. One end of the second winding LA2 of the isolation transformer is connected to ground. The other end of the second winding LA2 is connected to the anodes of diodes DA2 and DA3. The cathode of diode DA2 is connected to the gate of MOSFET QA4 through resistor RA4. The gate of MOSFET QA4 is connected to its source through resistor RA5. The source of MOSFET QA4 is connected to ground. Capacitor CA2 is connected in parallel with resistor RA5. The anode of Zener diode DA4 is connected to the source of MOSFET QA4. The cathode of Zener diode DA4 is connected to the gate of MOSFET QA4. The drain of MOSFET QA4 is connected to the gate of MOSFET QA5. The gate of MOSFET QA5 is connected to its source through capacitor CA3. The source of MOSFET QA5 is connected to the source of MOSFET QA4 and the anode of Zener diode DA5. The drain of MOSFET QA5 is connected to the negative terminal of Zener diode DA5 through resistor RA7. The drain of MOSFET QA4 is connected to the negative terminal of Zener diode DA5 through resistor RA6. The negative terminal of diode DA3 is connected to the negative terminal of Zener diode DA5 through resistor RA8. The negative terminal of Zener diode DA5 is connected to ground through capacitor CA4. The negative terminal of Zener diode DA5 is connected to the gate of MOSFET QA1 and the gate of MOSFET QA2 through resistor RA9. One end of resistor RA10 is connected to the gate of MOSFET QA2, and the other end of resistor RA10 is connected to the positive terminal of Zener diode DA5. The gate of MOSFET QA1 is connected to its source and the positive terminal of Zener diode DA5 through capacitor CA5. The gate of MOSFET QA2 is connected to its source and the positive terminal of Zener diode DA5 through capacitor CA6.

[0025] Specifically, in this embodiment, the control module transmits a PWM signal to the MOSFET QA3. The flyback isolation unit performs voltage conversion on the input low-voltage DC power to generate a drive voltage signal. After conversion, the drive voltage signal is rectified by diodes DA2 and DA3. At this time, MOSFET QA4 is turned on and MOSFET QA5 is turned off. Then, the drive voltage signal is regulated and filtered by Zener diode DA5 and capacitor CA4. Finally, the drive voltage signal is applied as a bias voltage to the gates of MOSFET QA1 and MOSFET QA2. At this time, MOSFET QA1 and MOSFET QA2... QA2 is turned on, establishing an electrical connection between the load port and the AC input port. When the control module stops transmitting PWM signals to the MOSFET QA3, the residual drive voltage signal after passing through the Zener diode DA5 and the capacitor CA4 applies a bias voltage to the gate of the MOSFET QA5 through the resistor RA6. At this time, the MOSFET QA5 is turned on, and the voltage at the negative terminal of the Zener diode DA5 drops to zero, making it impossible to apply a suitable bias voltage to the gates of the MOSFETs QA1 and QA2. The MOSFETs QA1 and QA2 are turned off, cutting off the electrical connection between the load port and the AC input port.

[0026] As a further preferred embodiment, this embodiment also includes a power supply module, which is connected to both the control module and the isolation drive module.

[0027] Specifically, in this embodiment, the power module includes a rectifier, a filter, a power chip of model KP3211BSG, capacitors CB1, CB2, CB3, and CB4, an inductor LB1, diodes DB1 and DB2, resistors RB1, RB2, RB3, and RB4, and the power chip is configured with a power supply terminal, a ground terminal, a feedback terminal, a sampling terminal, and a driving terminal. The AC input port is connected to the rectifier, which is connected to the filter. One end of the filter is connected to the drive terminal of the power chip. The sampling terminal of the power chip is connected to its ground terminal through resistor RB1. The feedback terminal of the power chip is connected to its ground terminal through capacitor CB1. The other end of the filter is connected to the anode of diode DB2. The cathode of diode DB2 is connected to the ground terminal of the power chip through resistors RB2 and RB3. The feedback terminal of the power chip is connected to resistors RB2 and RB3. The connection point is such that the negative terminal of diode DB2 is connected to the ground terminal of the power chip through capacitor CB2, the power supply terminal of the power chip is connected to its ground terminal through capacitor CB3, the ground terminal of the power chip is connected to the negative terminal of diode DB1 and one end of inductor LB1, the other end of inductor LB1 is connected to the positive terminal of diode DB2, the positive terminal of diode DB1 is connected to the positive terminal of diode DB2 through capacitor CB4, resistor RB4 is connected in parallel with capacitor CB4, and the positive terminal of diode DB1 is connected to ground.

[0028] As a further preferred embodiment, this embodiment also includes a display module, and the control module is connected to the display module.

[0029] Specifically, in this embodiment, the display module includes a display port, resistors RC1, RC2, RC3, and RC4, capacitors CC1 and CC2, the display port is configured with a power supply terminal, a ground terminal, a receiving terminal, and a transmitting terminal, and the control module is configured with a second connection terminal and a third connection terminal. The power supply terminal of the display port is connected to the power supply terminal, the ground terminal of the display port is connected to the ground terminal, the receiving terminal of the display port is connected to the second connection terminal of the control module through the resistor RC2, the receiving terminal of the display port is connected to the ground terminal through the capacitor CC1, the second connection terminal of the control module is connected to the power supply terminal through the resistor RC1, the transmitting terminal of the display port is connected to the third connection terminal of the control module through the resistor RC4, the third connection terminal of the control module is connected to the ground terminal through the capacitor CC2, and the third connection terminal of the control module is connected to the power supply terminal through the resistor RC3.

[0030] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An AC load control circuit, characterized in that, include: Control module; Load port, used to connect external AC loads; MOSFETs QA1 and QA2 are disposed between the load port and the mains input port. The drain of MOSFET QA1 is connected to the load port, the source of MOSFET QA1 is connected to the source of MOSFET QA2, and the drain of MOSFET QA2 is connected to the mains input port. An isolation drive module is disposed between the control module and the MOS transistors QA1 and QA2. The control module is connected to the isolation drive module, and the isolation drive module is connected to the gate of the MOS transistors QA1 and QA2 respectively. The control module performs isolation drive on the MOS transistors QA1 and QA2 through the isolation drive module.

2. The AC load control circuit according to claim 1, characterized in that: The isolation drive module includes a flyback isolation unit and a drive unit. The control module is connected to the flyback isolation unit, the flyback isolation unit is connected to the drive unit, and the drive unit is connected to the gate of the MOS transistor QA1 and the gate of the MOS transistor QA2, respectively.

3. The AC load control circuit according to claim 2, characterized in that: The flyback isolation unit includes an isolation transformer, resistors RA1, RA2, and RA3, capacitor CA1, MOSFET QA3, and diode DA1. The isolation transformer is equipped with a first winding LA1 and a second winding LA2. The control module is equipped with a first connection terminal. The first connection terminal of the control module is connected to the gate of the MOSFET QA3 through the resistor RA1. The gate of the MOSFET QA3 is connected to its source through the resistor RA2. The source of the MOSFET QA3 is connected to ground. The drain of the MOSFET QA3 is connected to the anode of the diode DA1. The cathode of the diode DA1 is connected to one end of the first winding LA1 of the isolation transformer through the capacitor CA1. The cathode of the diode DA1 is connected to the power supply terminal through the capacitor CA1. The resistor RA3 is connected in parallel with the capacitor CA1. The other end of the first winding LA1 of the isolation transformer is connected to the drain of the MOSFET QA3. The second winding LA2 of the isolation transformer is connected to the drive unit.

4. An AC load control circuit according to claim 3, characterized in that: The driving unit includes diode DA2, diode DA3, Zener diode DA4, Zener diode DA5, MOSFET QA4, MOSFET QA5, capacitor CA2, capacitor CA3, capacitor CA4, capacitor CA5, capacitor CA6, resistor RA4, resistor RA5, resistor RA6, resistor RA7, resistor RA8, resistor RA9, and resistor RA10. One end of the second winding LA2 of the isolation transformer is connected to ground. The other end of the second winding LA2 is connected to the anodes of diodes DA2 and DA3. The cathode of diode DA2 is connected to the gate of MOSFET QA4 through resistor RA4. The gate of MOSFET QA4 is connected to its source through resistor RA5. The source of MOSFET QA4 is connected to ground. Capacitor CA2 is connected in parallel with resistor RA5. The anode of Zener diode DA4 is connected to the source of MOSFET QA4. The cathode of Zener diode DA4 is connected to the gate of MOSFET QA4. The drain of MOSFET QA4 is connected to the gate of MOSFET QA5. The gate of MOSFET QA5 is connected to its source through capacitor CA3. The source of MOSFET QA5 is connected to the source of MOSFET QA4 and the anode of Zener diode DA5. The drain of MOSFET QA5 is connected to the negative terminal of Zener diode DA5 through resistor RA7. The drain of MOSFET QA4 is connected to the negative terminal of Zener diode DA5 through resistor RA6. The negative terminal of diode DA3 is connected to the negative terminal of Zener diode DA5 through resistor RA8. The negative terminal of Zener diode DA5 is connected to ground through capacitor CA4. The negative terminal of Zener diode DA5 is connected to the gate of MOSFET QA1 and the gate of MOSFET QA2 through resistor RA9. One end of resistor RA10 is connected to the gate of MOSFET QA2, and the other end of resistor RA10 is connected to the positive terminal of Zener diode DA5. The gate of MOSFET QA1 is connected to its source and the positive terminal of Zener diode DA5 through capacitor CA5. The gate of MOSFET QA2 is connected to its source and the positive terminal of Zener diode DA5 through capacitor CA6.

5. An AC load control circuit according to any one of claims 1 to 4, characterized in that: It also includes a power module, which is connected to both the control module and the isolation drive module.

6. An AC load control circuit according to claim 5, characterized in that: The power module includes a rectifier, a filter, a power chip of model KP3211BSG, capacitors CB1, CB2, CB3, and CB4, an inductor LB1, diodes DB1 and DB2, resistors RB1, RB2, RB3, and RB4. The power chip is configured with a power supply terminal, a ground terminal, a feedback terminal, a sampling terminal, and a drive terminal. The AC input port is connected to the rectifier, which is connected to the filter. One end of the filter is connected to the drive terminal of the power chip. The sampling terminal of the power chip is connected to its ground terminal through resistor RB1. The feedback terminal of the power chip is connected to its ground terminal through capacitor CB1. The other end of the filter is connected to the anode of diode DB2. The cathode of diode DB2 is connected to the ground terminal of the power chip through resistors RB2 and RB3. The feedback terminal of the power chip is connected to resistors RB2 and RB3. The connection point is such that the negative terminal of diode DB2 is connected to the ground terminal of the power chip through capacitor CB2, the power supply terminal of the power chip is connected to its ground terminal through capacitor CB3, the ground terminal of the power chip is connected to the negative terminal of diode DB1 and one end of inductor LB1, the other end of inductor LB1 is connected to the positive terminal of diode DB2, the positive terminal of diode DB1 is connected to the positive terminal of diode DB2 through capacitor CB4, resistor RB4 is connected in parallel with capacitor CB4, and the positive terminal of diode DB1 is connected to ground.

7. An AC load control circuit according to claim 1, characterized in that: It also includes a display module, and the control module is connected to the display module.

8. An AC load control circuit according to claim 7, characterized in that: The display module includes a display port, resistors RC1, RC2, RC3, and RC4, capacitors CC1 and CC2. The display port is configured with a power supply terminal, a ground terminal, a receiving terminal, and a transmitting terminal. The control module is configured with a second connection terminal and a third connection terminal. The power supply terminal of the display port is connected to the power supply terminal, the ground terminal of the display port is connected to the ground terminal, the receiving terminal of the display port is connected to the second connection terminal of the control module through the resistor RC2, the receiving terminal of the display port is connected to the ground terminal through the capacitor CC1, the second connection terminal of the control module is connected to the power supply terminal through the resistor RC1, the transmitting terminal of the display port is connected to the third connection terminal of the control module through the resistor RC4, the third connection terminal of the control module is connected to the ground terminal through the capacitor CC2, and the third connection terminal of the control module is connected to the power supply terminal through the resistor RC3.

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