CN-122026291-A - Control circuit and control method of air conditioning system, operation control device and air conditioner

CN122026291ACN 122026291 ACN122026291 ACN 122026291ACN-122026291-A

Abstract

The invention discloses a control circuit, a control method, an operation control device and an air conditioner of an air conditioning system. The control circuit of the air conditioning system comprises a three-phase power supply port, a three-phase PFC module and a single-phase power supply module, wherein the three-phase PFC module is connected with the three-phase power supply port and comprises a first positive bus and a first negative bus, the single-phase power supply module is connected with the single-phase power supply port through a switch component, the single-phase power supply port is any one of the three-phase power supply ports, the single-phase power supply module comprises a second positive bus and a second negative bus, the first positive bus is connected with the second positive bus through a first diode, and the first negative bus is connected with the second negative bus through a second diode. When the operation of the compressor is abnormal, the energy value fed back to the first positive bus and the first negative bus by the compressor is absorbed through the first diode and the second diode, the rising overshoot of the bus voltage is avoided, the stability of the bus voltage is improved, meanwhile, the damage to the power device module caused by the overhigh bus voltage is avoided, and the service life of the control circuit is prolonged.

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: a three-phase power supply port, the power supply is used for connecting a three-phase power supply; The three-phase PFC module is connected with the three-phase power port and comprises a first positive bus and a first negative bus; The single-phase power supply module is connected with a single-phase power supply port through a switch component, the single-phase power supply port is any one of the three-phase power supply ports, and the single-phase power supply module comprises a second positive bus and a second negative bus; The first positive bus is connected with the second positive bus through a first diode, and the first negative bus is connected with the second negative bus through a second diode.
2. The control circuit of claim 1, wherein an anode of the first diode is connected to the first positive bus, a cathode of the first diode is connected to the second positive bus, an anode of the second diode is connected to the second negative bus, and a cathode of the second diode is connected to the first negative bus.
3. The control circuit of claim 1, wherein the three-phase PFC module comprises a PFC inductor module, an active PFC module, and an electroless capacitor module, the PFC inductor module, the active PFC module, and the electroless capacitor module being connected in sequence, the PFC inductor module being connected to the three-phase power port, the electroless capacitor module being configured to act as a bus capacitor between the first positive bus and the first negative bus.
4. The control circuit of claim 1, wherein the single-phase power supply module comprises a rectifying module and an electrolytic capacitor module, the rectifying module is connected with the single-phase power supply port through the switching component, and the electrolytic capacitor module is used as a bus capacitor between the second positive bus and the second negative bus.
5. The control circuit of claim 4, wherein the rectifier module includes a first ac terminal, a second ac terminal, a first dc terminal, and a second dc terminal, the first ac terminal being connected to the single-phase power port through the switching element, the second ac terminal being connected to a ground reference, the first dc terminal being connected to the second positive bus, the second dc terminal being connected to the second negative bus.
6. The control circuit of any one of claims 1 to 5, wherein the switching component is a normally closed switch, the switching component comprising a switch state trigger port for receiving a switch state trigger signal, wherein the switch state trigger signal is derived from a bus voltage between the first positive bus and the first negative bus or is issued by a controller in accordance with a duration of power supplied to the three-phase PFC module; And when the switch component receives the switch state trigger signal through the switch state trigger port, the switch component is switched from a closed state to an open state.
7. The control method of the control circuit of the air conditioning system is characterized in that the control circuit comprises a three-phase power supply port, a three-phase PFC module and a single-phase power supply module, wherein the three-phase PFC module is connected with the three-phase power supply port, the single-phase power supply module is connected with the single-phase power supply port through a switch component, the single-phase power supply port is any one of the three-phase power supply ports, the three-phase PFC module comprises a first positive bus and a first negative bus, the single-phase power supply module comprises a second positive bus and a second negative bus, the first positive bus is connected with the second positive bus through a first diode, and the first negative bus is connected with the second negative bus through a second diode; The control method comprises the following steps: counting the duration of power supplied to the three-phase PFC module; and controlling the on-off state of the switch component according to the duration.
8. The control method according to claim 7, wherein the switching member is a normally closed switch; and controlling the on-off state of the switch component according to the duration, comprising: And when the duration time is greater than or equal to a preset duration time threshold, controlling the switch component to be in an off state so that the single-phase power supply module obtains a power supply from the three-phase PFC module.
9. The control method according to claim 7, wherein the switching member is a normally closed switch; and controlling the on-off state of the switch component according to the duration, comprising: and when the duration is smaller than a preset duration threshold, maintaining the switch component in a closed state so that the single-phase power supply module obtains a power supply from the single-phase power supply port.
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 a three-phase power supply port, a three-phase PFC module and a single-phase power supply module, wherein the three-phase power supply port is used for being connected with a three-phase power supply, the three-phase PFC module is connected with the three-phase power supply port, the three-phase PFC module comprises a first positive bus and a first negative bus, the single-phase power supply module is connected with the single-phase power supply port through a switch component, the single-phase power supply port is any one of the three-phase power supply ports, the single-phase power supply module comprises a second positive bus and a second negative bus, the first positive bus is connected with the second positive bus through a first diode, and the first negative bus is connected with the second negative bus through a second diode. According to some embodiments of the invention, the anode of the first diode is connected to the first positive bus, the cathode of the first diode is connected to the second positive bus, the anode of the second diode is connected to the second negative bus, and the cathode of the second diode is connected to the first negative bus. According to some embodiments of the invention, the three-phase PFC module includes a PFC inductor module, an active PFC module, and a non-electrolytic capacitor module, where the PFC inductor module, the active PFC module, and the non-electrolytic capacitor module are sequentially connected, the PFC inductor module is connected to the three-phase power port, and the non-electrolytic capacitor module is used as a bus capacitor between the first positive bus and the first negative bus. According to some embodiments of the invention, the single-phase power supply module comprises a rectifying module and an electrolytic capacitor module, wherein the rectifying module is connected with the electrolytic capacitor module, the rectifying module is connected with the single-phase power supply port through the switch component, and the electrolytic capacitor module is used as a bus capacitor between the second positive bus and the second negative bus. According to some embodiments of the invention, the rectifying module includes a first ac terminal, a second ac terminal, a first dc terminal, and a second dc terminal, the first ac terminal is connected to the single-phase power port through the switching element, the second ac terminal is connected to a ground reference, the first dc terminal is connected to the second positive bus, and the second dc terminal is connected to the second negative bus. According to some embodiments of the invention, the switching component is a normally closed sw