Method and device for discharging residual charges of air conditioner and air conditioner

Abstract

The invention provides a method and device for discharging residual charges of an air conditioner and the air conditioner. The air conditioner at least comprises a capacitor charging control circuit, a bus capacitor circuit, a fan driving circuit, a main control chip and a fan load. The discharging method comprises the steps that the main control chip responds to a bus capacitor discharging instruction and outputs a control signal used for controlling a capacitor charging control circuit to be disconnected; and obtaining a capacitor voltage value of a bus capacitor in the bus capacitor circuit, and controlling the fan driving circuit to drive the fan load to work through the obtained capacitor voltage value. According to the invention, rapid and efficient discharge of the bus capacitor can be realized, and the hardware cost and the system complexity are reduced on the premise of not influencing the working efficiency of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner circuit control, and in particular to a method and device for discharging residual charge of an air conditioner, and an air conditioner. Background Art

[0002] In existing air conditioner control systems, especially in high-power variable-frequency air conditioners, large-capacity capacitors are usually used for filtering and energy storage. When the air conditioner is shut down and the AC power supply is disconnected, these capacitors will still store a certain amount of electricity, and the voltage of the capacitor may exceed the safe value. If it is discharged naturally without control, it will take a long time to drop to a safe level, which not only increases the risk of electric shock to users, but also hinders production testing, hardware debugging or maintenance work.

[0003] At present, for the above-mentioned large-capacity capacitor, the commonly used discharge method includes connecting a discharge resistor in parallel with the capacitor. However, when the air conditioner is working normally, the parallel discharge resistor will increase the original power consumption of the air conditioner, reduce the working efficiency of the air conditioner, and increase energy consumption. In addition, although setting a dedicated hardware discharge circuit with a control switch can solve the above problems, it increases the hardware cost, occupies MCU resources, and increases the complexity of the system. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for discharging residual charge of an air conditioner, which solves the problem that the discharge scheme designed by the existing air conditioner control system for large-capacity capacitors used for filtering and energy storage will reduce the working efficiency of the air conditioner, increase energy consumption or increase hardware costs, occupy MCU resources, and increase system complexity.

[0005] According to an embodiment of the present invention, in a first aspect, a method for discharging residual charge of an air conditioner is provided, wherein the air conditioner at least comprises a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, a main control chip, and a fan load; the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, the power supply of the fan drive circuit comprises a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit;

[0006] The release method includes:

[0007] The main control chip outputs a control signal for controlling the capacitor charging control circuit to be disconnected in response to the bus capacitor discharge instruction;

[0008] The capacitance voltage value of the bus capacitor in the bus capacitor circuit is obtained, and the fan drive circuit is controlled by the obtained capacitance voltage value to drive the fan load to work.

[0009] Optionally, if the bus capacitor discharge instruction is not responded to, the main control chip responds to the start signal output by the dip switch circuit and outputs a control signal for controlling the capacitor charging control circuit to open the circuit, and the dip switch circuit is connected to the main control chip.

[0010] Optionally, the control signal is also used to control an indicator light in a discharge indicator light circuit to operate in a first mode, and the discharge indicator light circuit is connected to the main control chip.

[0011] Optionally, controlling the fan drive circuit to drive the fan load to work by using the acquired capacitor voltage value includes:

[0012] If the capacitor voltage value is greater than a first preset voltage value, outputting a first fan instruction to the fan drive circuit and the bus capacitor circuit;

[0013] The first fan instruction is used to turn off the fault protection mode of the bus capacitor circuit, and to enable the fan drive circuit, the fan load connected to the fan drive circuit and the bus capacitor to form a discharge path to consume the charge stored in the bus capacitor.

[0014] Optionally, if the capacitor voltage value is less than a first preset voltage value, the bus capacitor discharge instruction is terminated.

[0015] Optionally, after outputting the first fan instruction to the fan drive circuit, the method further includes:

[0016] Monitoring the residual voltage value of the bus capacitor of the bus capacitor circuit;

[0017] If the residual voltage value is less than a second preset voltage value, outputting a second fan instruction to the fan drive circuit;

[0018] The first fan instruction is used to disconnect the fan drive circuit, the fan load connected to the fan drive circuit and the discharge path of the bus capacitor to stop consuming the charge stored in the bus capacitor.

[0019] Optionally, if the residual voltage value is greater than a second preset voltage value, the first fan instruction is output to the fan drive circuit.

[0020] Optionally, the second fan instruction is also used to control the indicator light of the discharge indicator light circuit to operate in a second mode, and the discharge indicator light circuit is connected to the main control chip.

[0021] In a second aspect, according to an embodiment of the present invention, there is provided a residual charge discharge device for an air conditioner, which is applied to a main control chip of the air conditioner, wherein the air conditioner further comprises a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, and a fan load, wherein the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, the power supply of the fan drive circuit comprises a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit;

[0022] The main control chip executes the above-mentioned method for discharging residual charge of the air conditioner.

[0023] In a third aspect, according to an embodiment of the present invention, there is provided an air conditioner, comprising at least a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, a main control chip, and a fan load; the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, and is characterized in that the power supply of the fan drive circuit includes a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit;

[0024] The main control chip executes the above-mentioned method for discharging residual charge of the air conditioner.

[0025] The beneficial effects of the present invention are: through the air conditioner and the method for discharging residual charge of the air conditioner based on the air conditioner, the load on the air conditioner is utilized to realize fast and efficient discharge of the bus capacitor, while reducing hardware cost and system complexity. It is particularly suitable for air conditioner controllers with independent power supply of switching power supply and power circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the implementation flow of the method for discharging residual charge of an air conditioner according to an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of an air conditioner according to an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of logic implementation of a method for discharging residual charge of an air conditioner according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the circuit structure of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, the embodiment of the present invention provides a method for discharging residual charge of an air conditioner, which is applied to Figure 2 Air conditioner shown.

[0032] The embodiment of the present invention first briefly describes the air conditioner. Figure 2 The air conditioner at least includes a capacitor charging control circuit 201, a bus capacitor circuit 202, a fan drive circuit 203, a main control chip 204, and a fan load 205; the power output end of the capacitor charging control circuit 201 is connected to the power input end of the bus capacitor circuit 202; the control end of the fan drive circuit 203 and the control end of the capacitor charging control circuit 201 are both connected to the main control chip 204, the fan drive circuit 203 is used to drive the fan load 205 to work, and the bus capacitor C2 in the bus capacitor circuit 202 is connected to the fan drive circuit 203.

[0033] It should be noted that the fan drive circuit 203 is a power circuit and requires multiple independent power supplies to ensure stable operation of each part. In the embodiment of the present invention, the fan drive circuit 203 requires a 5V power supply and the power provided by the bus capacitor circuit 202 to operate.

[0034] like Figure 2 As shown, in the embodiment of the present invention, the above-mentioned 5V power supply is provided by the switching power supply 206, and the switching power supply 206 also provides 15V, 10V and other voltages required by other circuit modules.

[0035] based on Figure 2 The embodiment of the present invention describes a method for discharging residual charge of the air conditioner. Figure 1 , which includes but is not limited to the following steps:

[0036] SA1. The main control chip responds to the bus capacitor discharge instruction and outputs a control signal for controlling the capacitor charging control circuit to be disconnected.

[0037] SA2. Obtain the capacitance voltage value of the bus capacitor in the bus capacitance circuit, and control the fan drive circuit by the obtained capacitance voltage value to drive the fan load to work.

[0038] For the above step SA1, the embodiment of the present invention does not limit the way in which the main control chip obtains the bus capacitor discharge instruction. The main control chip can establish communication with a third party, and the bus capacitor discharge instruction is a communication instruction; or the main control chip establishes an electrical connection relationship with other control circuits, and the bus capacitor discharge instruction is a hardware control signal of other control circuits. In a preferred embodiment, the bus capacitor discharge instruction sent by the third party is received through a communication module, and the communication module is built into the main control chip.

[0039] In addition, if Figure 2 As shown, it also includes a discharge indicator light circuit 207. In the above step SA1, the control signal of the embodiment of the present invention is also used to control the indicator light in the discharge indicator light circuit to work in the first mode. The discharge indicator light circuit 207 is connected to the main control chip 204.

[0040] For the above step SA2, the embodiment of the present invention provides two preset capacitor voltage thresholds to control the fan drive circuit to drive the fan load to work. The above step SA2 includes:

[0041] SA21. If the capacitor voltage value is greater than a first preset voltage value, output a first fan instruction to the fan drive circuit and the bus capacitor circuit;

[0042] The first fan instruction is used to turn off the fault protection mode of the bus capacitor circuit, and to enable the fan drive circuit, the fan load connected to the fan drive circuit and the bus capacitor to form a discharge path to consume the charge stored in the bus capacitor.

[0043] In the above step SA21, if the capacitor voltage value is greater than the first preset voltage value, it means that the charge stored in the bus capacitor is too much and needs to be discharged. Similarly, if the capacitor voltage value is less than the first preset voltage value, it means that the charge stored in the bus capacitor does not exceed the safety value and does not need to be discharged. Therefore, if the capacitor voltage value is less than the first preset voltage value, the bus capacitor discharge instruction is terminated.

[0044] In one embodiment, after the above step SA21, that is, after outputting the first fan instruction to the fan drive circuit, the method further includes:

[0045] SA22, monitoring the residual voltage value of the bus capacitor of the bus capacitor circuit;

[0046] SA23, if the residual voltage value is less than a second preset voltage value, outputting a second fan instruction to the fan drive circuit;

[0047] The first fan instruction is used to disconnect the fan drive circuit, the fan load connected to the fan drive circuit and the discharge path of the bus capacitor to stop consuming the charge stored in the bus capacitor.

[0048] In the above steps SA22 and SA23, if the residual voltage value is less than the second preset voltage value, it means that the consumption of the charge stored in the bus capacitor has reached the discharge purpose. Similarly, if the residual voltage value is greater than the second preset voltage value, it means that the consumption of the charge stored in the bus capacitor has not reached the discharge purpose and needs to be discharged. Therefore, it also includes:

[0049] SB23. If the residual voltage value is greater than a second preset voltage value, maintain the output of the first fan instruction to the fan drive circuit in SA21, so that the fan drive circuit and the fan load connected to the fan drive circuit consume the charge stored in the bus capacitor.

[0050] Regarding the above steps SA23 and SB23 , the second fan instruction of the embodiment of the present invention is also used to control the indicator light of the discharge indicator light circuit to operate in the second mode, and the discharge indicator light circuit 207 is connected to the main control chip 204 .

[0051] Through the above steps SA1 and SA2, the embodiment of the present invention provides an air conditioner and a method for discharging residual charge of the air conditioner based on the air conditioner, which utilizes the load on the air conditioner to achieve fast and efficient discharge of the bus capacitor, while reducing hardware cost and system complexity. It is particularly suitable for air conditioner controllers with independent power supply for the switching power supply and the power circuit.

[0052] In a specific application, when the main control chip responds to the bus capacitor discharge instruction, the third party can obtain feedback from the main control chip. However, in the above embodiment, the indicator light of the discharge indicator circuit works in the first mode, indicating that the main control chip has responded to the bus capacitor discharge instruction, and the indicator light of the discharge indicator circuit works in the second mode, indicating that the bus capacitor discharge instruction has been completed and the purpose of consuming the charge stored in the bus capacitor has been achieved. Then, the user can observe whether the main control chip has received the bus capacitor discharge instruction and whether the discharge of the residual charge of the air conditioner has been completed through the working mode of the indicator light.

[0053] Based on this, in another embodiment, if a third party issues a bus capacitor discharge instruction, and the user observes that the indicator light does not work in the first mode, it means that the main control chip does not respond to the bus capacitor discharge instruction. At this time, there may be a situation where a third party or other control circuit sends a bus capacitor discharge instruction, but the main control chip does not respond. Therefore, the embodiment of the present invention also provides a situation where the control chip does not respond to the bus capacitor discharge instruction according to the following example. Figure 2The air conditioner shown in FIG. 1 further includes a dial switch circuit 208, which provides another method for discharging residual charge of the air conditioner. Figure 1 Based on the method for discharging residual charge of the air conditioner shown in the figure, it also includes:

[0054] SB1. If the bus capacitor discharge instruction is not responded to, the main control chip responds to the start signal output by the dip switch circuit and outputs a control signal for controlling the capacitor charging control circuit to be disconnected. The dip switch circuit is connected to the main control chip.

[0055] It is understandable that steps SA1 and SA2 are not described in detail here. Figure 1 SA1 in the figure belongs to the parallel implementation step. When SA1 cannot be implemented, the same control process is implemented through SB1. For example, the user turns the switch of the dip switch circuit to the ON state, and the dip switch circuit generates an opening signal, so that the main control chip completes the same control process of SA1 and SA2 according to the opening signal from the dip switch circuit. In addition, the control signal output by the main control chip is the same, and is still used to control the indicator light in the discharge indicator light circuit to work according to the first mode.

[0056] like Figure 3 As shown, the embodiment of the present invention also provides a logic judgment diagram including the above-mentioned step SA1, step SA2, and steps SA21 to SA24, SB23, and step SB1 to illustrate the complete implementation of the method for discharging residual charge of the air conditioner.

[0057] Figure 3In the embodiment, it is assumed that a third party such as an indoor unit or a terminal issues a bus capacitor discharge instruction. When the main control chip receives the bus capacitor discharge instruction, it responds to the bus capacitor discharge instruction, thereby outputting a control signal of the charging circuit relay that disconnects the capacitor charging control circuit to the capacitor charging control circuit. At this time, the relay disconnects the capacitor charging control circuit, and at the same time, the indicator light of the discharge indicator light circuit works according to the first mode, such as the indicator light flashing. Then the main control chip monitors whether the capacitor voltage value of the bus capacitor is greater than the first preset voltage value. If not, it means that the bus capacitor does not need to be discharged, and the control ends. If so, it means that the bus capacitor needs to be discharged. At this time, the fault protection mode of the bus capacitor circuit is turned off by the first fan instruction, and the charge stored in the bus capacitor is consumed at the same time. The purpose of turning off the fault protection mode of the bus capacitor circuit is to avoid the fault protection of the bus capacitor circuit when the bus capacitor is discharged, causing the circuit to be automatically disconnected, thereby terminating the discharge process of the bus capacitor. The discharge process of the bus capacitor is a process of consuming the charge stored in the bus capacitor, including: the main control chip outputs a first fan instruction to the fan drive circuit, and the fan drive circuit, the fan load and the bus capacitor form a discharge loop. At this time, the fan load connected to the fan drive circuit uses the charge stored in the bus capacitor, thereby achieving the purpose of consuming the charge stored in the bus capacitor. In the process of consuming the charge stored in the bus capacitor through the above steps, the residual voltage value of the bus capacitor of the bus capacitor circuit is also monitored. If the residual voltage value is less than the second preset voltage value, it means that the consumption is complete. At this time, the main control chip outputs a second fan instruction to the fan drive circuit, disconnects the above discharge loop, and makes the fan drive circuit and the fan load connected to the fan drive circuit stop consuming the charge stored in the bus capacitor. At the same time, the main control chip controls the indicator light of the discharge indicator light circuit to work according to the second mode, such as the indicator light is always on. If the residual voltage value is greater than the second preset voltage value, it means that it has not been consumed yet. At this time, continue to consume the charge stored in the bus capacitor through the fan load according to the first fan instruction. In addition, when it is found that the main control chip does not respond to the bus capacitor discharge instruction, it is considered that the main control chip does not respond to the bus capacitor discharge instruction. At this time, the state of the dial switch circuit is judged. If the dial switch circuit outputs an on signal, the charging circuit relay of the capacitor charging control circuit is disconnected, and the indicator light of the discharge indicator light circuit is controlled to work according to the first mode. If the dial switch circuit also does not output an on signal, the control is terminated.

[0058] The embodiment of the present invention also provides a residual charge discharge device for an air conditioner, which is applied to Figure 2The main control chip of the air conditioner shown in the figure, the air conditioner also has a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, and a fan load, the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, the power supply of the fan drive circuit includes a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit; the main control chip executes the discharge method for residual charge of the air conditioner in any of the above embodiments.

[0059] like Figure 4 As shown, the embodiment of the present invention Figure 2 The air conditioner provided is described in detail.

[0060] Figure 2 The composition structure of the air conditioner, the composition structure of the air conditioner and steps SA1 and SA2 executed by the main control chip will not be described in detail here.

[0061] Figure 4 This is the circuit structure of the air conditioner. Figure 4 Shows Figure 2 A detailed implementation method and circuit connection method of each module.

[0062] Figure 4 In the embodiment, the capacitor charging control circuit 201 includes an L1 terminal, an N1 terminal, an L2 terminal, an N2 terminal, RELAY1 to RELAY3, K401, K402 and K403. The bus capacitor circuit 202 includes a bus capacitor C2, a first resistor R1, a second resistor R2, an L3 terminal, an N3 terminal and a P1 terminal. The first resistor R1 and the second resistor R2 are connected in series and then connected in parallel with the bus capacitor C2. The fan drive circuit 203 includes a FAN2 terminal, a P2 terminal and an XS terminal, and the XS terminal is connected to the fan load 205. The main control chip 204 includes a BO1 terminal, a fan FAN1 terminal, a VDC_AD terminal, RELAY_A to RELAY_C terminals and a D terminal.

[0063] Among them, the D end of the main control chip 204 is the indicator light control output end, which is connected to the discharge indicator light circuit 207. Exemplarily, the discharge indicator light circuit 207 includes a third resistor R3 and an indicator light LED1 connected in series. The L1 end and N1 end of the capacitor charging control circuit 201 are power access ends, and the L4 end and N4 end of the switching power supply are power output ends, and are connected to the L1 end and N1 end of the capacitor charging control circuit 201. The L2 end and N2 end of the capacitor charging control circuit 201 are power output ends, and the L3 end and N3 end of the bus capacitor circuit 202 are power access ends. Therefore, the L2 end and the N2 end are connected to the L3 end and the N3 end, so that the power output end of the capacitor charging control circuit 201 is connected to the power access end of the bus capacitor circuit. RELAY_A~RELAY_C of the main control chip 204 are all control terminals for outputting control signals; the FAN2 terminal of the fan drive circuit 203 is a control terminal for receiving control signals; RELAY1~RELAY3 of the capacitor charging control circuit 201 are all control terminals for receiving control signals; therefore, the FAN2 terminal of the fan drive circuit 203 is connected to the FAN terminal of the main control chip 204, and the RELAY1~RELAY3 of the capacitor charging control circuit 201 are connected to the RELAY_A~RELAY_C of the main control chip 204, so that the control terminal of the fan drive circuit 206 and the control terminal of the capacitor charging control circuit 201 are both connected to the main control chip 204. The VDC_AD terminal of the main control chip 204 is a voltage monitoring terminal, and the node between the first resistor R1 and the second resistor R2 in the bus capacitor circuit 202 is used to output the capacitance voltage value of the bus capacitor C2, so the node between the first resistor R1 and the second resistor R2 is connected to the VDC_AD terminal of the main control chip 204. The end of the first resistor R1 in the bus capacitor circuit 202 that is not connected to the second resistor R2 is the P1 terminal, which is also the charge output terminal of the bus capacitor C2, and the P2 terminal of the fan drive circuit 203 is a power input terminal, so the P1 terminal of the bus capacitor circuit 202 is connected to the P2 terminal of the fan drive circuit to achieve the connection between the bus capacitor C2 and the fan drive circuit 203. In addition, K401 is the first relay switch, K402 is the second relay switch, and K403 is the third relay switch, which are controlled by the signals received by RELAY1~RELAY3 of the capacitor charging control circuit 201, and the capacitor charging control circuit 201 is disconnected when the relay is disconnected; the BO1 terminal of the main control chip 204 is used to receive the bus capacitor discharge instruction; the switching power supply 206 is connected to +15V, +12V and +5V voltages, and supplies power to the capacitor charging control circuit 201 through the capacitor C1 and the converter DB1.

[0064] like Figure 4As shown, in a preferred implementation, the air conditioner may further include a dip switch circuit 208 connected to the main control chip 204, the dip switch circuit 208 includes a BO2 terminal, and the BO2 terminal is a switch signal output port, which is used to output a switch signal to the instruction receiving terminal BO1 of the main control chip 204. When the dip switch circuit connected to the main control chip is included, SB1 is also implemented, that is, if the bus capacitor discharge instruction is not responded to, the main control chip responds to the start signal output by the dip switch circuit, and outputs a control signal for controlling the capacitor charging control circuit to be disconnected.

[0065] The embodiment of the present invention does not limit the way in which the main control chip obtains the bus capacitor discharge instruction. The main control chip can establish communication with a third party, and the bus capacitor discharge instruction is a communication instruction; or the main control chip establishes an electrical connection relationship with other control circuits, and the bus capacitor discharge instruction is a hardware control signal of other control circuits. In a preferred embodiment, the bus capacitor discharge instruction sent by the third party is received through a communication module, and the communication module is built into the main control chip.

[0066] In actual applications, there may be a situation where a third party or other control circuit sends a bus capacitor discharge instruction, but the main control chip cannot receive it. In this case, the same control process is implemented through the dip switch circuit 208. For example, the user turns the switch of the dip switch circuit to the ON state, and the dip switch circuit generates an opening signal, so that the main control chip completes the discharge according to the opening signal from the dip switch circuit. Figure 1 The control flow of SA1 and SA2 shown is the same. In addition, the control signal output by the main control chip is the same, and is still used to control the indicator light in the discharge indicator light circuit to work in the first mode.

[0067] It should be noted that in the air conditioner provided in the embodiment of the present invention, the steps executed by the main control chip also include not only the original steps SA1 and SA2, but also steps SA21 to SA24, SB23, and step SB1, which will not be repeated here.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for discharging residual charge of an air conditioner, characterized in that: The air conditioner at least includes a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, a main control chip, and a fan load; the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, the power supply of the fan drive circuit includes a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit; The release method includes: The main control chip outputs a control signal for controlling the capacitor charging control circuit to be disconnected in response to the bus capacitor discharge instruction; The capacitance voltage value of the bus capacitor in the bus capacitor circuit is obtained, and the fan drive circuit is controlled by the obtained capacitance voltage value to drive the fan load to work.

2. The method for discharging residual charge of an air conditioner according to claim 1, characterized in that: If the bus capacitor discharge instruction is not responded to, the main control chip responds to the start signal output by the dip switch circuit and outputs a control signal for controlling the capacitor charging control circuit to be disconnected, and the dip switch circuit is connected to the main control chip.

3. The method for discharging residual charge of an air conditioner according to claim 1 or 2, characterized in that: The control signal is also used to control an indicator light in a discharge indicator light circuit to operate in a first mode, and the discharge indicator light circuit is connected to the main control chip.

4. The method for discharging residual charge of an air conditioner according to claim 1, characterized in that: The step of controlling the fan drive circuit to drive the fan load to work by using the acquired capacitor voltage value includes: If the capacitor voltage value is greater than a first preset voltage value, outputting a first fan instruction to the fan drive circuit and the bus capacitor circuit; The first fan instruction is used to turn off the fault protection mode of the bus capacitor circuit, and to enable the fan drive circuit, the fan load connected to the fan drive circuit and the bus capacitor to form a discharge path to consume the charge stored in the bus capacitor.

5. The method for discharging residual charge of an air conditioner according to claim 4, characterized in that: If the capacitor voltage value is less than the first preset voltage value, the bus capacitor discharge instruction is terminated.

6. The method for discharging residual charge of an air conditioner according to claim 4, characterized in that: After outputting the first fan instruction to the fan drive circuit, the method further includes: Monitoring the residual voltage value of the bus capacitor of the bus capacitor circuit; If the residual voltage value is less than a second preset voltage value, outputting a second fan instruction to the fan drive circuit; The first fan instruction is used to disconnect the fan drive circuit, the fan load connected to the fan drive circuit and the discharge path of the bus capacitor to stop consuming the charge stored in the bus capacitor.

7. The method for discharging residual charge of an air conditioner according to claim 6, characterized in that: If the residual voltage value is greater than a second preset voltage value, the first fan command is output to the fan drive circuit.

8. The method for discharging residual charge of an air conditioner according to claim 6 or 7, characterized in that: The second fan instruction is also used to control the indicator light of the discharge indicator light circuit to operate in a second mode, and the discharge indicator light circuit is connected to the main control chip.

9. A residual charge discharge device for an air conditioner, characterized in that: A main control chip applied to an air conditioner, the air conditioner further comprising a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, and a fan load, wherein the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, the power supply of the fan drive circuit comprises a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit; The main control chip executes the method for discharging residual charge of the air conditioner as described in any one of items 1 to 8.

10. An air conditioner, characterized in that: At least includes a capacitor charging control circuit, a bus capacitor circuit, a fan drive circuit, a main control chip, and a fan load; the power output end of the capacitor charging control circuit is connected to the power input end of the bus capacitor circuit; the control end of the fan drive circuit and the control end of the capacitor charging control circuit are both connected to the main control chip, the fan drive circuit is used to drive the fan load to work, the power supply of the fan drive circuit includes a switching power supply and the bus capacitor, and the bus capacitor in the bus capacitor circuit is connected to the fan drive circuit; The main control chip executes the method for discharging residual charge of the air conditioner as described in any one of items 1 to 8.

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