X capacitor discharge circuit, system and electric appliance

Abstract

The utility model discloses an X capacitor bleeder circuit, a system and an electric appliance. The X capacitor bleeder circuit comprises a power supply detection circuit, a first resistance circuit, a master control circuit and a first switch circuit. The power supply detection circuit is connected with the main control circuit and used for being connected with an external power supply, detecting the access state of the external power supply and outputting a power supply state signal to the main control circuit; the first switching circuit is used for being connected with an electric load and the X capacitor, and the electric load is connected with the X capacitor in parallel when the first switching circuit is in a conducting state; the first resistance circuit is connected in parallel with the X capacitor; and the main control circuit is connected with the first switching circuit and is used for controlling the first switching circuit to be switched on when the power state signal is that the power supply is switched off, so that the first resistance circuit is connected with the electric load in parallel and discharges the X capacitor, and the power consumption is reduced while the safety requirement is met.

Description

X-capacitor discharge circuit, system and electrical components Technical Field

[0001] This utility model relates to the field of discharge circuit technology, and in particular to an X-capacitor discharge circuit, system and electrical appliance. Background Technology

[0002] Current technology typically uses two bleeder resistors connected in parallel with the X capacitor to discharge it. However, because the X capacitor is constantly connected to mains power, for larger X capacitors, the longer it takes to discharge to the same target voltage (<34V in the home appliance industry, <60V in the information technology industry), making it difficult to meet safety regulations. To ensure a shorter discharge time, the resistance value of the bleeder resistors can only be reduced. However, with variable mains voltage, a smaller bleeder resistor results in greater losses, affecting the overall standby power consumption of the device. Summary of the Invention

[0003] This utility model provides an X-capacitor discharge circuit, system, and electrical appliance to solve the problem of high standby power consumption in existing X-capacitor discharge circuits.

[0004] An X-capacitor bleeder circuit includes a power supply detection circuit, a first resistor circuit, a main control circuit, and a first switch circuit.

[0005] The power detection circuit is connected to the main control circuit and is used to connect to an external power source, detect the connection status of the external power source, and output a power status signal to the main control circuit.

[0006] The first switching circuit is used to connect to the electrical load and the X capacitor, and when it is in the conducting state, the electrical load and the X capacitor are connected in parallel.

[0007] The first resistor circuit is used to connect in parallel with the X capacitor;

[0008] The main control circuit is connected to the first switching circuit and is used to control the first switching circuit to turn on when the power status signal is power off, so that the first resistor circuit is connected in parallel with the electrical load to discharge the X capacitor.

[0009] Furthermore, the power detection circuit includes a first power supply terminal, a rectifier circuit, and a second switching circuit;

[0010] The first power supply terminal is connected to the main control circuit and the second switch circuit;

[0011] The rectifier circuit is connected to the external power supply and is used to output a DC signal according to the AC signal input by the external power supply when the external power supply is connected; and to stop outputting the DC signal when the external power supply is disconnected.

[0012] The second switching circuit is connected to the rectifier circuit, the main control circuit, and the ground terminal, and is used to turn the main control circuit and the ground terminal on or off according to the DC signal.

[0013] Furthermore, the external power supply includes a live wire connection terminal and a neutral wire connection terminal; the rectifier circuit includes a first diode;

[0014] The anode of the first diode is connected to the live wire connection terminal, and the cathode of the first diode is connected to the second switching circuit.

[0015] Alternatively, the anode of the first diode is connected to the neutral wire connection terminal, and the cathode of the first diode is connected to the second switching circuit.

[0016] Furthermore, the rectifier circuit also includes a second diode;

[0017] The anode of the first diode is connected to the live wire connection terminal, and the cathode of the first diode is connected to the second switching circuit.

[0018] The anode of the second diode is connected to the neutral wire connection terminal, and the cathode of the second diode is connected to the second switching circuit.

[0019] Furthermore, the second switching circuit includes an optocoupler; the optocoupler includes a light-emitting diode and a phototransistor;

[0020] The anode of the light-emitting diode is connected to the rectifier circuit, and the cathode of the light-emitting diode is grounded.

[0021] The first end of the phototransistor is connected to the first power supply terminal and the main control circuit, and the second end of the phototransistor is grounded.

[0022] Furthermore, the second switching circuit includes a first switching transistor; the first end of the first switching transistor is connected to the first power supply terminal and the main control circuit, the second end of the first switching transistor is grounded, and the third end of the first switching transistor is connected to the rectifier circuit.

[0023] Furthermore, the first switching circuit includes a second power supply terminal, a drive circuit, and a first relay; the first relay includes a coil and a first contact switch;

[0024] The second power supply terminal is connected to the coil;

[0025] The first terminal of the driving circuit is connected to the coil, the second terminal of the driving circuit is grounded, and the third terminal of the driving circuit is connected to the main control circuit.

[0026] The first terminal of the first contact switch is connected to the first terminal of the X capacitor through the electrical load, and the second terminal of the first contact switch is connected to the second terminal of the X capacitor.

[0027] Furthermore, the driving circuit includes a first voltage divider circuit and a first transistor;

[0028] The first terminal of the first voltage divider circuit is connected to the main control circuit, and the second terminal of the first voltage divider circuit is grounded.

[0029] The first terminal of the first transistor is connected to the coil, the second terminal of the first transistor is grounded, and the third terminal of the first transistor is connected to the third terminal of the first voltage divider circuit.

[0030] An X-capacitor discharge system includes an X-capacitor and the aforementioned X-capacitor discharge circuit;

[0031] The first terminal of the X capacitor is connected to the live wire of the external power supply, the first terminal of the first resistor circuit, and the electrical load. The second terminal of the X capacitor is connected to the neutral wire of the external power supply, the second terminal of the first resistor circuit, and the first switch circuit.

[0032] An electrical appliance includes the aforementioned X-capacitor discharge system and an electrical load; a first terminal of the electrical load is connected to the X-capacitor and the live wire connection terminal of the external power supply, and a second terminal of the electrical load is connected to the first switching circuit.

[0033] This utility model provides an X-capacitor discharge circuit, system, and electrical components. The X-capacitor discharge circuit includes a power detection circuit, a first resistor circuit, a main control circuit, and a first switch circuit. The power detection circuit, connected to the main control circuit, is used to connect to an external power supply, detect the external power supply connection status, and output a power status signal to the main control circuit. The first switch circuit is used to connect to the electrical load and the X-capacitor. When in a conducting state, the electrical load is connected in parallel with the X-capacitor. The first resistor circuit is connected in parallel with the X-capacitor. The main control circuit, connected to the first switch circuit, controls the first switch circuit to conduct when the power status signal indicates that the power is off, so that the first resistor circuit is connected in parallel with the electrical load to discharge the X-capacitor, thereby reducing power consumption while meeting safety requirements. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 is a schematic diagram of the X capacitor discharge circuit in one embodiment of the present invention.

[0036] In the diagram: 1. Capacitor X; 2. Electrical load; 31. Power supply detection circuit; 311. Rectifier circuit; 312. Second switching circuit; 32. First resistor circuit; 33. Main control circuit; 34. First switching circuit; 341. Drive circuit; 342. First relay. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0038] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0040] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0041] This embodiment provides an X-capacitor discharge circuit, which is applied in an electrical appliance. Exemplarily, the appliance includes an X-capacitor discharge system and an electrical load 2. Exemplarily, if the appliance is a rice cooker, the electrical load 2 can be a heating element or an LED light. If the appliance is a fan, the electrical load 2 can be a motor.

[0042] For example, the X-capacitor discharge system includes an X-capacitor 1 and an X-capacitor discharge circuit. The X-capacitor 1 is, for example, the capacitor CX1 in FIG1.

[0043] As an example, the first terminal L1 of capacitor X1 is connected to the live wire of an external power source, and the second terminal N1 of capacitor X1 is connected to the neutral wire of the external power source. Understandably, this external power source is the mains power grid.

[0044] This embodiment provides an X-capacitor discharge circuit, as shown in Figure 1, including a power detection circuit 31, a first resistor circuit 32, a main control circuit 33, and a first switch circuit 34. The power detection circuit 31 is connected to the main control circuit 33 and is used to connect to an external power supply, detect the external power supply connection status, and output a power status signal to the main control circuit 33. The first switch circuit 34 is used to connect to the electrical load 2 and the X-capacitor 1. When it is in the on state, the electrical load 2 is connected in parallel with the X-capacitor 1. The first resistor circuit 32 is connected in parallel with the X-capacitor 1. The main control circuit 33 is connected to the first switch circuit 34 and is used to control the first switch circuit 34 to conduct when the power status signal is that the power is off, so that the first resistor circuit 32 is connected in parallel with the electrical load 2 to discharge the X-capacitor 1.

[0045] As an example, when an external power source is connected, the power detection circuit 31 detects the connection and instructs the main control circuit 33 to disconnect the first switching circuit 34. At this time, only the first resistor circuit 32 is connected in parallel with capacitor X 1, and the electrical load 2 performs the normal function of the appliance. Under normal circumstances, the first resistor circuit 32 exhibits a relatively large resistance and low power consumption. When the external power source is disconnected, the power detection circuit 31 detects the disconnection and instructs the main control circuit 33 to turn on the first switching circuit 34. The electrical load 2 is connected in parallel with capacitor X 1, and the first resistor circuit 32 is connected in parallel with the electrical load 2. Thus, capacitor X 1 is discharged simultaneously through the first resistor circuit 32 and the electrical load 2, achieving rapid discharge.

[0046] For example, the main control circuit 33 includes an MCU (Microcontroller Unit).

[0047] In this embodiment, the X capacitor discharge circuit includes a power detection circuit 31, a first resistor circuit 32, a main control circuit 33, and a first switch circuit 34. The power detection circuit 31 is connected to the main control circuit 33 and is used to connect to an external power supply, detect the external power supply connection status, and output a power status signal to the main control circuit 33. The first switch circuit 34 is connected to the electrical load 2 and the X capacitor 1. When it is in the on state, the electrical load 2 is connected in parallel with the X capacitor 1. The first resistor circuit 32 is connected in parallel with the X capacitor 1. The main control circuit 33 is connected to the first switch circuit 34 and is used to control the first switch circuit 34 to conduct when the power status signal is that the power is off, so that the first resistor circuit 32 is connected in parallel with the electrical load 2 to discharge the X capacitor 1, thereby reducing power consumption while meeting safety requirements.

[0048] In one embodiment, the power detection circuit 31 includes a first power supply terminal, a rectifier circuit 311, and a second switching circuit 312. The first power supply terminal is connected to the main control circuit 33 and the second switching circuit 312. The rectifier circuit 311 is connected to an external power source and is used to output a DC signal based on the AC signal input from the external power source when the external power source is connected, and to stop outputting the DC signal when the external power source is disconnected. The second switching circuit 312 is connected to the rectifier circuit 311, the main control circuit 33, and the ground terminal and is used to turn the main control circuit 33 and the ground terminal on or off based on the DC signal.

[0049] For example, the first power supply terminal is used to provide a first voltage. For example, the first voltage is 5V.

[0050] As an example, when an external power source is connected, the rectifier circuit 311 provides a DC signal to drive the second switching circuit 312 to conduct. The second switching circuit 312 connects the main control circuit 33 and the ground terminal. The main control circuit 33 detects a low-level signal and controls the first switching circuit 34 to disconnect. At this time, only the first resistor circuit 32 is connected in parallel with the X capacitor 1, and the electrical load 2 performs the normal function of the appliance, reducing losses. When the external power source is disconnected, since the rectifier circuit 311 stops outputting a DC signal, the second switching circuit 312 disconnects. The main control circuit 33 detects a high-level signal, i.e., the first voltage, provided by the first power supply terminal and controls the first switching circuit 34 to conduct. The electrical load 2 is connected in parallel with the X capacitor 1, and the first resistor circuit 32 is connected in parallel with the electrical load 2. Thus, the X capacitor 1 is discharged simultaneously through the first resistor circuit 32 and the electrical load 2, achieving the purpose of rapid discharge.

[0051] In this embodiment, the power detection circuit 31 detects whether an external power source is connected through a first power supply terminal, a rectifier circuit 311, and a second switching circuit 312. The circuit structure is simple, the cost is low, and the accuracy of the detection is guaranteed.

[0052] In one embodiment, the external power supply includes a live wire connection terminal and a neutral wire connection terminal; the rectifier circuit 311 includes a first diode D1; the anode of the first diode D1 is connected to the live wire connection terminal, and the cathode of the first diode D1 is connected to the second switching circuit 312; or, the anode of the first diode D1 is connected to the neutral wire connection terminal, and the cathode of the first diode D1 is connected to the second switching circuit 312.

[0053] As an example, the rectifier circuit 311 rectifies the positive or negative half-cycle of the AC signal through the first diode D1 to form a DC pulse signal to the second switching circuit 312 to drive the second switching circuit 312 to conduct.

[0054] In this embodiment, the rectifier circuit 311 includes a first diode D1, which can generate a DC signal to drive the second switching circuit 312 to conduct, resulting in lower cost.

[0055] In one embodiment, the rectifier circuit 311 further includes a second diode D2; the anode of the first diode D1 is connected to the live wire connection terminal, and the cathode of the first diode D1 is connected to the second switching circuit 312; the anode of the second diode D2 is connected to the neutral wire connection terminal, and the cathode of the second diode D2 is connected to the second switching circuit 312.

[0056] In this embodiment, the rectifier circuit 311 detects the AC signal of the external power supply simultaneously through the first diode D1 and the second diode D2, which can improve the detection accuracy and detection time.

[0057] In one embodiment, the second switching circuit 312 includes an optocoupler U2; the optocoupler U2 includes a light-emitting diode and a phototransistor; the anode of the light-emitting diode is connected to the rectifier circuit 311, and the cathode of the light-emitting diode is grounded; the first end of the phototransistor is connected to the first power supply terminal and the main control circuit 33, and the second end of the phototransistor is grounded.

[0058] For example, the anode of the light-emitting diode is connected to the rectifier circuit 311 through resistors R2 and R5 in series to prevent excessive current from damaging the light-emitting diode. The first terminal of the phototransistor is connected to the first power supply terminal through resistor R6, and the connection node between the first terminal of the phototransistor and resistor R6 is connected to the main control circuit 33.

[0059] In this embodiment, when an external power source is connected, the LED operates, the phototransistor conducts, and the main control circuit 33 and the ground terminal are connected. The main control circuit 33 detects a low-level signal and controls the first switching circuit 34 to disconnect. At this time, only the first resistor circuit 32 is connected in parallel with the X capacitor 1, and the electrical load 2 performs the normal function of the appliance, reducing losses. When the external power source is disconnected, the rectifier circuit 311 stops outputting DC signals, the LED stops working, the phototransistor disconnects, and the main control circuit 33 detects a high-level signal (i.e., the first voltage) provided by the first power supply terminal. It then controls the first switching circuit 34 to conduct, connecting the electrical load 2 in parallel with the X capacitor 1, and the first resistor circuit 32 in parallel with the electrical load 2. Thus, the X capacitor 1 is discharged simultaneously through the first resistor circuit 32 and the electrical load 2, achieving rapid discharge.

[0060] In this embodiment, the second switching circuit 312 includes an optocoupler U2, which isolates the external power supply from the main control circuit 33, ensuring the safety of the main control circuit 33.

[0061] In one embodiment, the second switching circuit 312 includes a first switching transistor (not shown in the figure); the first end of the first switching transistor is connected to the first power supply terminal and the main control circuit 33, the second end of the first switching transistor is grounded, and the third end of the first switching transistor is connected to the rectifier circuit 311.

[0062] As an example, the first switching transistor can be a MOSFET or a transistor, and the choice can be made based on practical experience; no restrictions are imposed here.

[0063] For example, the first terminal of the first switching transistor is the source or collector, the second terminal is the drain or emitter, and the third terminal is the gate or base. The third terminal of the first switching transistor can be connected to the rectifier circuit 311 through series resistors R2 and R5 to prevent excessive current from damaging the first switching transistor.

[0064] In this embodiment, the second switching circuit 312 includes a first switching transistor to ensure a faster switching response speed, thereby improving the discharge speed of capacitor X1.

[0065] In one embodiment, the first switching circuit 34 includes a second power supply terminal, a drive circuit 341, and a first relay 342. The first relay 342 includes a coil and a first contact switch. The second power supply terminal is connected to the coil. The first terminal of the drive circuit 341 is connected to the coil, the second terminal of the drive circuit 341 is grounded, and the third terminal of the drive circuit 341 is connected to the main control circuit 33. The first terminal of the first contact switch is connected to the first terminal L1 of the X capacitor 1 through the electrical load 2, and the second terminal of the first contact switch is connected to the second terminal N1 of the X capacitor 1. The first relay 342 is, for example, the relay RLY1 in Figure 1.

[0066] For example, the second power supply terminal is used to provide a second voltage. For example, the second voltage is 5V.

[0067] In this embodiment, when an external power source is connected, the main control circuit 33 controls the drive circuit 341 to disconnect the grounding circuit between the second power supply terminal and the coil, and the first contact switch is open. At this time, only the first resistor circuit 32 is connected in parallel with the X capacitor 1, and the electrical load 2 performs the normal function of the electrical appliance, reducing losses. When the external power source is disconnected, the main control circuit 33 controls the drive circuit 341 to connect the grounding circuit between the second power supply terminal and the coil, the coil is energized, and the first contact switch is closed. The electrical load 2 is connected in parallel with the X capacitor 1, and the first resistor circuit 32 is connected in parallel with the electrical load 2. Thus, the X capacitor 1 is discharged simultaneously through the first resistor circuit 32 and the electrical load 2, achieving the purpose of rapid discharge.

[0068] In this embodiment, the first switching circuit 34 includes a second power supply terminal, a drive circuit 341, and a first relay 342. The electrical load 2 and the X capacitor 1 are connected in parallel through the second power supply terminal, the drive circuit 341, and the first relay 342. The circuit is simple and has a low cost.

[0069] In one embodiment, the driving circuit 341 includes a first voltage divider circuit and a first transistor Q1; the first terminal of the first voltage divider circuit is connected to the main control circuit 33, and the second terminal of the first voltage divider circuit is grounded; the first terminal of the first transistor Q1 is connected to the coil, the second terminal of the first transistor Q1 is grounded, and the third terminal of the first transistor Q1 is connected to the third terminal of the first voltage divider circuit.

[0070] For example, the first voltage divider circuit includes a first voltage divider resistor R4 and a second voltage divider resistor R7, which are connected in series between the main control circuit 33 and the ground terminal. The connection node between the first voltage divider resistor R4 and the second voltage divider resistor R7 is connected to the third terminal of the first transistor Q1.

[0071] For example, the first transistor Q1 may be a bipolar transistor or a field-effect transistor.

[0072] As an example, the first transistor Q1 is a bipolar transistor, with its first terminal being the collector, its second terminal being the emitter, and its third terminal being the base.

[0073] In this embodiment, the grounding loop between the second power supply terminal and the coil is disconnected or connected by the first transistor Q1, resulting in a simple circuit structure and low cost.

[0074] This embodiment provides an X-capacitor discharge system, including an X-capacitor 1 and the aforementioned X-capacitor discharge circuit; the first terminal L1 of the X-capacitor 1 is connected to the live wire connection terminal of the external power supply, the first terminal of the first resistor circuit 32 and the electrical load 2, and the second terminal N1 of the X-capacitor 1 is connected to the neutral wire connection terminal of the external power supply, the second terminal of the first resistor circuit 32 and the first switch circuit 34.

[0075] This embodiment provides an electrical appliance, including the above-mentioned X capacitor discharge system and an electrical load 2; the first end of the electrical load 2 is connected to the X capacitor 1 and the live wire connection of the external power supply, and the second end of the electrical load 2 is connected to the first switching circuit 34.

[0076] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A capacitor X discharge circuit, characterized in that, It includes a power detection circuit, a first resistor circuit, a main control circuit, and a first switch circuit; the power detection circuit is connected to the main control circuit and is used to connect to an external power source, detect the connection status of the external power source, and output a power status signal to the main control circuit. The first switching circuit is used to connect to the electrical load and the X capacitor, and when it is in the conducting state, the electrical load and the X capacitor are connected in parallel. The first resistor circuit is used to connect in parallel with the X capacitor; The main control circuit is connected to the first switching circuit and is used to control the first switching circuit to turn on when the power status signal is power off, so that the first resistor circuit is connected in parallel with the electrical load to discharge the X capacitor.

2. The X-capacitor discharge circuit according to claim 1, characterized in that, The power detection circuit includes a first power supply terminal, a rectifier circuit, and a second switching circuit. The first power supply terminal is connected to the main control circuit and the second switching circuit. The rectifier circuit is connected to the external power supply and is used to output a DC signal according to the AC signal input by the external power supply when the external power supply is connected; and to stop outputting the DC signal when the external power supply is disconnected. The second switching circuit is connected to the rectifier circuit, the main control circuit, and the ground terminal and is used to turn the main control circuit and the ground terminal on or off according to the DC signal.

3. The X-capacitor discharge circuit according to claim 2, characterized in that, The external power supply includes a live wire connection terminal and a neutral wire connection terminal; the rectifier circuit includes a first diode; the anode of the first diode is connected to the live wire connection terminal, and the cathode of the first diode is connected to the second switching circuit; or, the anode of the first diode is connected to the neutral wire connection terminal, and the cathode of the first diode is connected to the second switching circuit.

4. The X-capacitor discharge circuit according to claim 3, characterized in that, The rectifier circuit further includes a second diode; the anode of the first diode is connected to the live wire connection terminal, and the cathode of the first diode is connected to the second switching circuit; the anode of the second diode is connected to the neutral wire connection terminal, and the cathode of the second diode is connected to the second switching circuit.

5. The X-capacitor discharge circuit according to claim 2, characterized in that, The second switching circuit includes an optocoupler; the optocoupler includes a light-emitting diode and a phototransistor; the anode of the light-emitting diode is connected to the rectifier circuit, and the cathode of the light-emitting diode is grounded; the first end of the phototransistor is connected to the first power supply terminal and the main control circuit, and the second end of the phototransistor is grounded.

6. The X-capacitor discharge circuit according to claim 2, characterized in that, The second switching circuit includes a first switching transistor; the first end of the first switching transistor is connected to the first power supply terminal and the main control circuit, the second end of the first switching transistor is grounded, and the third end of the first switching transistor is connected to the rectifier circuit.

7. The X-capacitor discharge circuit according to claim 1, characterized in that, The first switching circuit includes a second power supply terminal, a drive circuit, and a first relay; the first relay includes a coil and a first contact switch; the second power supply terminal is connected to the coil; the first terminal of the drive circuit is connected to the coil, the second terminal of the drive circuit is grounded, and the third terminal of the drive circuit is connected to the main control circuit; the first terminal of the first contact switch is connected to the first terminal of the X capacitor through the electrical load, and the second terminal of the first contact switch is connected to the second terminal of the X capacitor.

8. The X-capacitor discharge circuit according to claim 7, characterized in that, The driving circuit includes a first voltage divider circuit and a first transistor; the first terminal of the first voltage divider circuit is connected to the main control circuit, and the second terminal of the first voltage divider circuit is grounded; the first terminal of the first transistor is connected to the coil, the second terminal of the first transistor is grounded, and the third terminal of the first transistor is connected to the third terminal of the first voltage divider circuit.

9. A capacitor discharge system, characterized in that, It includes an X capacitor and an X capacitor discharge circuit as described in any one of claims 1 to 8; the first terminal of the X capacitor is connected to the live wire connection terminal of the external power supply, the first terminal of the first resistor circuit and the electrical load, and the second terminal of the X capacitor is connected to the neutral wire connection terminal of the external power supply, the second terminal of the first resistor circuit and the first switch circuit.

10. An electrical appliance, characterized in that, It includes the X capacitor discharge system as described in claim 9 and an electrical load; the first end of the electrical load is connected to the live wire connection of the X capacitor and the external power supply, and the second end of the electrical load is connected to the first switching circuit.

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