CN-122026290-A - Control circuit and control method of air conditioning system, operation control device and air conditioner

CN122026290ACN 122026290 ACN122026290 ACN 122026290ACN-122026290-A

Abstract

The invention discloses a control circuit, a control method, an operation control device and an air conditioner of an air conditioning system, wherein the control circuit of the air conditioning system comprises an active PFC module; the non-electrolytic capacitor module is connected with the active PFC module and used as a bus capacitor; the overvoltage protection module is connected with the non-electrolytic capacitor module and is used for carrying out overvoltage protection when overvoltage abnormality occurs in the bus voltage; and the power device module is connected with the overvoltage protection module. Through increasing overvoltage protection module behind non-electrolytic capacitor module, when detecting that bus voltage appears the excessive pressure unusual, the inside current absorption return circuit that forms of overvoltage protection module absorbs the energy that the compressor repafed back to reduce the energy value that the compressor repafed back to bus voltage, effectively avoid bus voltage to rise and overshoot, realize overvoltage protection, improved bus voltage's stability, avoid the bus voltage too high damage power device module, improved control circuit's life-span.

Inventors

LI NING
LONG TAN
MO YIQIANG
YAN XIAOJUN

Assignees

佛山市顺德区美的电子科技有限公司
广东美的制冷设备有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (12)

1. A control circuit of an air conditioning system, comprising: An active PFC module; The non-electrolytic capacitor module is connected with the active PFC module and used as a bus capacitor; the overvoltage protection module is connected with the non-electrolytic capacitor module and is used for carrying out overvoltage protection when overvoltage abnormality occurs in the bus voltage; And the power device module is connected with the overvoltage protection module.
2. The control circuit of claim 1, wherein the overvoltage protection module includes a switching component and a current sink component connected in series with the switching component between a positive bus and a negative bus.
3. A control circuit according to claim 2, wherein the current sink means comprises a current sink inductance and a freewheeling diode, the current sink inductance and freewheeling diode being connected in parallel and then connected to the switching means.
4. The control circuit according to claim 2, wherein the current absorbing part includes a current limiting resistor and an electrolytic capacitor connected in series and then connected to the switching part.
5. The control circuit of claim 2, wherein the switch component includes a switch state trigger port for receiving a switch state trigger signal; and when the switch component receives the switch state trigger signal through the switch state trigger port, the current switch state is changed.
6. The control circuit of any one of claims 1 to 5, wherein the electroless capacitance module comprises a first electroless capacitance and a second electroless capacitance connected in series between a positive bus and a negative bus.
7. The control method of the control circuit of the air conditioning system is characterized in that the control circuit comprises an active PFC module, an overvoltage protection module, a power device module and a non-electrolytic capacitor module used as a bus capacitor, wherein the active PFC module, the non-electrolytic capacitor module, the overvoltage protection module and the power device module are connected in sequence; The control method comprises the following steps: Detecting bus voltage of a bus; and controlling the working state of the overvoltage protection module according to the bus voltage so as to carry out overvoltage protection.
8. The control method according to claim 7, wherein the overvoltage protection module includes a current-absorbing inductor, a flywheel diode, and a switching element, and the current-absorbing inductor and the flywheel diode are connected in parallel and then connected with the switching element between a positive bus and a negative bus; and controlling the working state of the overvoltage protection module according to the bus voltage to perform overvoltage protection, including: When the bus voltage is greater than or equal to a preset voltage threshold, controlling the switch component to be in a conducting state so as to enable the non-electrolytic capacitor module, the current absorption inductor and the switch component to form a current absorption loop; Or when the bus voltage is smaller than a preset voltage threshold value, controlling the switch component to be in an off state so as to enable the current absorption inductor and the freewheeling diode to form a current consumption loop.
9. The control method according to claim 7, wherein the overvoltage protection module comprises a current limiting resistor, an electrolytic capacitor and a switching component, and the current limiting resistor and the electrolytic capacitor are connected in series and then connected with the switching component between a positive bus and a negative bus; and controlling the working state of the overvoltage protection module according to the bus voltage to perform overvoltage protection, including: When the bus voltage is greater than or equal to a preset voltage threshold, controlling the switch component to be in a conducting state so as to enable the non-electrolytic capacitor module, the current limiting resistor, the electrolytic capacitor and the switch component to form a current consumption loop; Or when the bus voltage is smaller than a preset voltage threshold value, controlling the switch component to be in an off state.
10. An operation control device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, the processor executing the program to realize the control method of the control circuit of the air conditioning system according to any one of claims 7 to 9.
11. An air conditioner comprising the control circuit of the air conditioning system according to any one of claims 1 to 6, or comprising the operation control device according to claim 10.
12. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the control method of the control circuit of the air conditioning system according to any one of claims 7 to 9.

Description

Control circuit and control method of air conditioning system, operation control device and air conditioner Technical Field The present invention relates to the field of air conditioners, and in particular, to a control circuit, a control method, an operation control device and an air conditioner for an air conditioning system. Background The common control circuit structure of the air conditioning system comprises an active PFC module and an energy storage device, wherein the energy storage device connected with the rear stage of the active PFC module is usually an electrolytic capacitor, and the electrolytic capacitor has a rectifying function and provides energy for the power device module of the rear stage. However, the electrolytic capacitor has the advantages of low service life and high cost, and the harmonic problem of an electric control alternating current end can be caused in the charging and discharging process of the electrolytic capacitor with a large capacity value, so that the service life of a control circuit of the air conditioner is reduced. In the related art, the energy storage device uses a non-electrolytic capacitor (e.g., a thin film capacitor with a small capacitance value) to replace an electrolytic capacitor with a large capacitance value. When the thin film capacitor is used as a bus capacitor, due to the small capacitance value, when the power device module operates at a high speed and the driving module is abnormally in need of emergency protection and shutdown, the energy of the power device module can be fed back to the bus, the bus voltage is abnormally increased, the bus voltage is unstable, the power device module is possibly damaged due to the fact that the bus voltage is too high, and the service life of a control circuit of the air conditioner is shortened. Disclosure of Invention The invention aims to at least solve one of the technical problems in the prior art, and provides a control circuit, a control method, an operation control device and an air conditioner of an air conditioning system, which are beneficial to improving the stability of bus voltage and prolonging the service life of the control circuit. In a first aspect, the embodiment of the invention provides a control circuit of an air conditioning system, which comprises an active PFC module, a non-electrolytic capacitor module, an overvoltage protection module and a power device module, wherein the non-electrolytic capacitor module is connected with the active PFC module and used as a bus capacitor, the overvoltage protection module is connected with the non-electrolytic capacitor module and used for performing overvoltage protection when an overvoltage abnormality occurs in a bus voltage, and the power device module is connected with the overvoltage protection module. According to some embodiments of the invention, the overvoltage protection module comprises a switching component and a current sink component connected in series with the switching component between a positive bus and a negative bus. According to some embodiments of the invention, the current sink comprises a current sink inductor and a freewheeling diode connected in parallel and then connected to the switching element. According to some embodiments of the invention, the current absorbing component comprises a current limiting resistor and an electrolytic capacitor, and the current limiting resistor and the electrolytic capacitor are connected in series and then connected with the switch component. According to some embodiments of the invention, the switch component comprises a switch state trigger port for receiving a switch state trigger signal; and when the switch component receives the switch state trigger signal through the switch state trigger port, the current switch state is changed. According to some embodiments of the invention, the non-electrolytic capacitor module comprises a first non-electrolytic capacitor and a second non-electrolytic capacitor, which are connected in series and then connected between a positive bus and a negative bus. In a second aspect, an embodiment of the present invention provides a control method for a control circuit of an air conditioning system, where the control circuit includes an active PFC module, an overvoltage protection module, a power device module, and an electroless capacitor module used as a bus capacitor, where the active PFC module, the electroless capacitor module, the overvoltage protection module, and the power device module are sequentially connected; The control method comprises the following steps: Detecting bus voltage of a bus; and controlling the working state of the overvoltage protection module according to the bus voltage so as to carry out overvoltage protection. According to some embodiments of the invention, the overvoltage protection module comprises a current absorbing inductor, a freewheeling diode and a switch component, wherein the current absorbing inductor and the f