Control circuit, control method and operation control device of air conditioning system and air conditioner

Abstract

The invention discloses a control circuit, a control method and an operation control device of an air conditioning system and an air conditioner. The control circuit of the air conditioning system comprises a three-phase power supply port; the three-phase PFC module is connected with the three-phase power supply port, and 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, and the single-phase power supply module comprises a second positive bus and a second negative bus; wherein the first positive bus is connected with the second positive bus through the first diode, and the first negative bus is connected with the second negative bus through the second diode. When the compressor operates abnormally, 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 bus voltage is prevented from rising and overshooting, the stability of the bus voltage is improved, meanwhile, the power device module is prevented from being damaged by overhigh bus voltage, and the service life of the control circuit is prolonged.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to a control circuit, control method, operation control device, and air conditioner for an air conditioning system. Background Technology

[0002] The common control circuit structure of air conditioning systems includes an active PFC module and energy storage devices. The energy storage device connected after the active PFC module is usually an electrolytic capacitor. The electrolytic capacitor has the function of rectification and provides energy to the power device module in the next stage. However, electrolytic capacitors have short lifespan and high cost. Moreover, the charging and discharging process of large-capacity electrolytic capacitors can cause harmonic problems at the AC terminal of the electrical control, reducing the lifespan of the air conditioner's control circuit.

[0003] In related technologies, energy storage devices use non-electrolytic capacitors (such as small-value film capacitors) instead of large-value electrolytic capacitors. When using film capacitors as bus capacitors, due to their small capacitance, when the power device module is running at high speed and the drive module malfunctions and requires emergency protection shutdown, the energy of the power device module will be fed back to the bus. This will cause an abnormal increase in bus voltage, making the bus voltage unstable. Excessive bus voltage may damage the power device module, shortening the lifespan of the air conditioner's control circuit. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a control circuit, control method, operation control device and air conditioner for an air conditioning system, which is beneficial to improving the stability of the bus voltage and at the same time improving the life of the control circuit.

[0005] In a first aspect, embodiments of the present invention provide a control circuit for an air conditioning system, comprising: a three-phase power port for connecting to a three-phase power supply; a three-phase PFC module connected to the three-phase power port, the three-phase PFC module including a first positive bus and a first negative bus; and a single-phase power module connected to the single-phase power port via a switching component, the single-phase power port being any one of the three-phase power ports, the single-phase power module including a second positive bus and a second negative bus; wherein the first positive bus is connected to the second positive bus via a first diode, and the first negative bus is connected to the second negative bus via a second diode.

[0006] According to some embodiments of the present invention, the anode of the first diode is connected to the first positive bus, and 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.

[0007] According to some embodiments of the present invention, the three-phase PFC module includes a PFC inductor module, an active PFC module, and a non-electrolytic capacitor module. The PFC inductor module, the active PFC module, and the non-electrolytic capacitor module are connected in sequence. The PFC inductor module is connected to the three-phase power supply port, and the non-electrolytic capacitor module is used as a bus capacitor between the first positive bus and the first negative bus.

[0008] According to some embodiments of the present invention, the single-phase power supply module includes a rectifier module and an electrolytic capacitor module. The rectifier module is connected to the electrolytic capacitor module. The rectifier module is connected to the single-phase power supply port through the switching component. The electrolytic capacitor module is used as a bus capacitor between the second positive bus and the second negative bus.

[0009] According to some embodiments of the present invention, 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 is connected to the single-phase power supply port through the switching component, the second AC terminal is connected to reference ground, the first DC terminal is connected to the second positive bus, and the second DC terminal is connected to the second negative bus.

[0010] According to some embodiments of the present invention, the switching component is a normally closed switch, and the switching component includes a switch state trigger port for receiving a switch state trigger signal, wherein the switch state trigger signal comes from the bus voltage between the first positive bus and the first negative bus, or is issued by the controller according to the duration of the power supply to the three-phase PFC module;

[0011] When the switch component receives the switch state trigger signal through the switch state trigger port, it switches from the closed state to the open state.

[0012] Secondly, embodiments of the present invention provide a control method for a control circuit of an air conditioning system. The control circuit includes a three-phase power port, a three-phase PFC module, and a single-phase power module. The three-phase PFC module is connected to the three-phase power port, and the single-phase power module is connected to the single-phase power port through a switching component. The single-phase power port is any one of the three-phase power ports. The three-phase PFC module includes a first positive bus and a first negative bus. The single-phase power module includes a second positive bus and a second negative bus. The first positive bus is connected to the second positive bus through a first diode, and the first negative bus is connected to the second negative bus through a second diode.

[0013] The control method includes:

[0014] The duration of power supplied to the three-phase PFC module is recorded.

[0015] The on / off state of the switching component is controlled according to the duration.

[0016] According to some embodiments of the present invention, the switching component is a normally closed switch;

[0017] The step of controlling the on / off state of the switching component according to the duration includes:

[0018] When the duration is greater than or equal to a preset duration threshold, the switching component is controlled to be in the off state so that the single-phase power module obtains power from the three-phase PFC module.

[0019] In some embodiments of the present invention, the switching component is a normally closed switch;

[0020] The step of controlling the on / off state of the switching component according to the duration includes:

[0021] When the duration is less than a preset duration threshold, the switch component remains in a closed state so that the single-phase power module obtains power from the single-phase power port.

[0022] Thirdly, embodiments of the present invention provide an operation control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the control method of the control circuit of the air conditioning system as described in the technical solution of the second aspect above.

[0023] Fourthly, embodiments of the present invention provide an air conditioner, including the control circuit of the air conditioning system described in the first aspect of the technical solution, or including the operation control device described in the third aspect of the technical solution.

[0024] Fifthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for causing a computer to execute a control method for the control circuit of an air conditioning system as described in the second aspect above.

[0025] The control circuit, control method, operation control device, and air conditioner of the air conditioning system provided according to embodiments of the present invention have at least one of the following advantages: A three-phase power port is connected to a three-phase power supply, and a three-phase PFC module is connected to the three-phase power port. The current output from the three-phase power supply is transmitted to the three-phase PFC module through the three-phase power port. The three-phase PFC module rectifies and corrects the current to output a stable DC current, reducing harmonic content. A single-phase power module is connected to the single-phase power port through a switching component. When the switching component is in the closed state, power is supplied to the single-phase power module through the single-phase power port to enable the single-phase power module to operate normally. The single-phase power module includes a second positive bus and a second negative bus. The first positive bus is connected to the second positive bus through a first diode, and the first negative bus is connected to the second negative bus through a second diode. When the duration of power supply to the three-phase PFC module reaches a preset duration threshold, the switching component switches to the open state, at which time the single-phase power module obtains power from the three-phase PFC module. When the compressor malfunctions, the energy fed back by the compressor increases the voltage of the first bus between the first positive and first negative buses. This creates a voltage difference between the first bus voltage and the second bus voltage. At this time, the first bus voltage supplies power to the single-phase power module through the first and second diodes. A current absorption circuit is formed inside the single-phase power module, absorbing the energy fed back from the compressor between the first positive and first negative buses through the first and second diodes. This reduces the energy value fed back to the first bus voltage, effectively preventing overshoot and achieving overvoltage protection. This improves the stability of the first bus voltage, prevents damage to the power device module from excessively high voltage, and extends the lifespan of both the power device module and the control circuit.

[0026] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0027] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0029] Figure 1 This is a circuit diagram of a conventional electrolytic capacitor control circuit for an air conditioning system provided in an embodiment of the present invention;

[0030] Figure 2 This is a circuit diagram of a non-electrolytic capacitor control circuit for an air conditioning system provided in an embodiment of the present invention;

[0031] Figure 3 This is a circuit diagram of a control circuit for an air conditioning system provided in an embodiment of the present invention;

[0032] Figure 4 This is a flowchart of a control method for a control circuit of an air conditioning system provided in an embodiment of the present invention;

[0033] Figure 5 This is a flowchart of a method for controlling the on / off state of a switching component based on a duration, provided by an embodiment of the present invention.

[0034] Figure 6 This is a flowchart of a method for controlling the on / off state of a switching component based on a duration, according to another embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of an operation control device provided in an embodiment of the present invention. Detailed Implementation

[0036] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0037] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, while "above," "below," "within," etc. are understood to include the number itself. "Any one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0038] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this invention should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this invention in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0039] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Reference Figure 1 As shown, Figure 1 This is a circuit diagram of a conventional electrolytic capacitor control circuit for an air conditioning system provided by an embodiment of the present invention. The structure of a commonly used control circuit in an air conditioning system includes an active PFC module and an energy storage device. The energy storage device connected after the active PFC module is usually an electrolytic capacitor. It can be understood that the active PFC module is a rectifier / PFC module, and the energy storage device includes a first electrolytic capacitor C1 and a second electrolytic capacitor C2, which are connected in series. The first electrolytic capacitor C1 and the second electrolytic capacitor C2 have rectification functions and provide energy to the subsequent power device module. However, electrolytic capacitors have low lifespan and high cost. Furthermore, the charging and discharging process of large-capacity electrolytic capacitors can cause harmonic problems at the AC terminal of the control circuit, resulting in current and voltage asymmetry in the control circuit, poor stability of the control circuit, and reduced lifespan.

[0041] Therefore, the development direction of energy storage devices in the control circuit structure of air conditioning systems is to use non-electrolytic capacitors (such as small-value film capacitors). Small-value film capacitors replace large-value electrolytic capacitors, serving as the bus capacitor. Because film capacitors are non-electrolytic capacitors, their small capacitance means that when the compressor is running at high speed and the drive module malfunctions requiring emergency shutdown, the compressor energy will be fed back to the bus. This will cause an abnormal rise in bus voltage, resulting in poor bus voltage stability. Excessive bus voltage may damage the compressor inverter module, shortening the lifespan of the air conditioner's control circuit. In related technologies, to solve the above problems, an electrolytic capacitor module is installed before the fan inverter module in the control circuit structure of the air conditioning system, referring to... Figure 2 As shown, Figure 2This is a circuit diagram of a non-electrolytic capacitor control circuit for an air conditioning system provided by an embodiment of the present invention. The electrolytic capacitor module includes a third electrolytic capacitor C3 and a fourth electrolytic capacitor C4. A diode D1 is disposed between the non-electrolytic capacitor module and the electrolytic capacitor module. The non-electrolytic capacitor module includes a first non-electrolytic capacitor C11 and a second non-electrolytic capacitor C22. When the compressor suddenly stops and the compressor energy feedback bus voltage rises, the first non-electrolytic capacitor C11 and the second non-electrolytic capacitor C22 charge the third and fourth electrolytic capacitors C3 and C4 through the diode D1. The third and fourth electrolytic capacitors C3 and C4 absorb the energy fed back from the compressor, ensuring that the bus does not experience overvoltage. However, in this scheme, the third and fourth electrolytic capacitors C3 and C4 are part of the fan power circuit. During the operation of the control circuit, the third and fourth electrolytic capacitors C3 and C4 are constantly charging and discharging, which still results in a short lifespan for the electrolytic capacitors, thus leading to a short lifespan for the control circuit.

[0042] Based on this, embodiments of the present invention provide a control circuit, control method, operation control device, and air conditioner for an air conditioning system, which is beneficial to improving the stability of the bus voltage and extending the lifespan of the control circuit.

[0043] Reference Figure 3 As shown, Figure 3 This is a circuit diagram of a control circuit for an air conditioning system provided in an embodiment of the present invention. The control circuit of the air conditioning system includes a three-phase power port, a three-phase PFC module, and a single-phase power module. The three-phase power port is used to connect to a three-phase power supply. The three-phase PFC module is connected to the three-phase power port and includes a first positive bus and a first negative bus. The single-phase power module is connected to the single-phase power port through a switch component SW1. The single-phase power port can be any one of the three-phase power ports. The single-phase power module includes a second positive bus and a second negative bus. The first positive bus is connected to the second positive bus through a first diode D1, and the first negative bus is connected to the second negative bus through a second diode D2.

[0044] In some embodiments of the present invention, the control circuit of the air conditioning system includes a three-phase power supply and a three-phase power port. The three-phase power supply provides power support to the control circuit. The three-phase power port is connected to the three-phase power supply. A three-phase PFC module is connected to the three-phase power port. The current output by the three-phase power supply is transmitted to the three-phase PFC module through the three-phase power port. The three-phase PFC module rectifies the current to output a stable DC current and corrects the current to synchronize the current waveform and output voltage waveform of the three-phase power supply, thereby improving the power factor, reducing harmonic content, and improving the power quality of the power grid. The three-phase PFC module includes a first positive bus and a first negative bus. The voltage of the first bus between the first positive bus and the first negative bus is used to supply power to a power device module located between the first positive bus and the first negative bus. The power device module includes a compressor. The control circuit also includes a single-phase power supply module and a single-phase power port. The single-phase power supply module is connected to the single-phase power port through a switch component SW1. When the switch component SW1 is in the closed state, power is supplied to the single-phase power supply module through the single-phase power port to enable the single-phase power supply module to operate normally. The single-phase power module includes a second positive bus and a second negative bus. The single-phase power port can be any one of the three-phase power ports. The first positive bus is connected to the second positive bus through a first diode D1, and the first negative bus is connected to the second negative bus through a second diode D2. When the power supply duration of the three-phase PFC module reaches a preset duration threshold, the switching component SW1 switches to the off state, at which time the single-phase power module obtains power from the three-phase PFC module. When the compressor malfunctions, due to the small capacitance of the first non-electrolytic capacitor C11 and the second non-electrolytic capacitor C22, the energy fed back by the compressor will cause the voltage of the first bus between the first positive bus and the first negative bus to rise rapidly in a short period of time, which can easily lead to overshoot of the first bus voltage. Since there is a voltage difference between the voltage of the first bus between the first positive bus and the first negative bus and the voltage of the second bus between the second positive bus and the second negative bus, the first bus voltage supplies power to the single-phase power module through the first diode D1 and the second diode D2. A current absorption circuit is formed inside the single-phase power module, which absorbs the energy fed back from the compressor to the first positive bus and the first negative bus through the first diode and the second diode, thereby reducing the energy value fed back to the first bus voltage by the compressor. This effectively avoids the first bus voltage from rising and overshooting, realizes overvoltage protection, improves the stability of the first bus voltage, and thus avoids damage to the power device module due to excessive first bus voltage, thereby increasing the service life of the power device module and the control circuit.

[0045] In some embodiments of the present invention, the three-phase power supply consists of three AC power sources with the same frequency, equal amplitude, and phases differing by 120° sequentially. The three-phase power supply includes a first power source A, a second power source B, and a third power source C. The three-phase power supply ports include a first power source port D, a second power source port E, and a third power source port F. The three-phase power supply ports are connected to the three-phase power supply. Specifically, the first power source A is connected to the first power source port D, the second power source B is connected to the second power source port E, and the third power source C is connected to the third power source port F. The three-phase power supply is connected to the three-phase power supply ports, and a three-phase PFC module is connected to the three-phase power supply ports. Therefore, the three-phase power supply is connected to the three-phase PFC module through the three-phase power supply ports. The three-phase PFC module rectifies the current output by the three-phase power supply to output a stable DC current and corrects the current to synchronize the current waveform with the output voltage waveform, thereby improving the power factor, reducing harmonic content, and improving the power quality of the power grid.

[0046] In some embodiments of the present invention, the anode of the first diode D1 is connected to the first positive bus, and the cathode of the first diode D1 is connected to the second positive bus; the anode of the second diode D2 is connected to the second negative bus, and the cathode of the second diode D2 is connected to the first negative bus.

[0047] In this embodiment of the invention, the first positive bus is connected to the second positive bus via a first diode D1, and the first negative bus is connected to the second negative bus via a second diode D2. Specifically, the anode of the first diode D1 is connected to the first positive bus, and the cathode of the first diode D1 is connected to the second positive bus, so that the first positive bus is connected to the second positive bus via the first diode D1; the anode of the second diode D2 is connected to the second negative bus, and the cathode of the second diode D2 is connected to the first negative bus, so that the first negative bus is connected to the second negative bus via the second diode D2. When the duration of the power supply of the three-phase PFC module reaches a preset duration threshold, and the switching component SW1 switches to the off state, the single-phase power module obtains power from the three-phase PFC module. The three-phase PFC module includes a first positive bus and a first negative bus, and the single-phase power module includes a second positive bus and a second negative bus. Therefore, it can be understood that the single-phase power module obtaining power from the three-phase PFC module includes the single-phase power module obtaining power from the first bus voltage between the first positive bus and the first negative bus. Because diodes have unidirectional guiding characteristics, when the switching component SW1 is switched to the open state, a charging circuit is formed: first positive bus – anode of first diode D1 – cathode of first diode D1 – second positive bus – second negative bus – anode of second diode D2 – cathode of second diode D2 – second negative bus. The first bus voltage supplies power to the single-phase power module through the first diode D1 and the second diode D2. The first and second diodes absorb the energy fed back from the compressor to the first positive bus and the first negative bus, thereby reducing the energy value fed back from the compressor to the first bus voltage. This effectively avoids overshoot of the first bus voltage, realizes overvoltage protection, improves the stability of the first bus voltage, and thus avoids damage to the power device module due to excessive first bus voltage, thereby increasing the service life of the power device module and the control circuit.

[0048] In some embodiments of the present invention, the three-phase PFC module includes a PFC inductor module, an active PFC module, and a non-electrolytic capacitor module. The PFC inductor module, the active PFC module, and the non-electrolytic capacitor module are connected in sequence. The PFC inductor module is connected to the three-phase power supply port, and the non-electrolytic capacitor module is used as a bus capacitor between the first positive bus and the first negative bus.

[0049] The three-phase PFC module includes a PFC inductor module, an active PFC module, and a non-electrolytic capacitor module. The PFC inductor module is a three-phase PFC inductor module connected to three-phase power ports. The three-phase PFC inductor module includes a first PFC inductor L1, a second PFC inductor L2, and a third PFC inductor L3. The three-phase power ports include a first power port D, a second power port E, and a third power port F. It can be understood that the first power port D is connected to the first PFC inductor L1, the second power port E is connected to the second PFC inductor L2, and the third power port F is connected to the third PFC inductor L3. The first PFC inductors L1, L2, and L3 are connected in parallel in pairs and then connected to the active PFC module. The non-electrolytic capacitor module is connected to the active PFC module and serves as the first bus capacitor between the first positive bus and the first negative bus.

[0050] A PFC inductor module is installed in the control circuit. The PFC inductor module is an electronic device module used to improve the power factor of the three-phase power supply, reduce harmonic pollution, and improve energy utilization. The PFC inductor module connects to the three-phase power supply through the three-phase power port. It can correct the output current of the three-phase power supply, synchronizing the current waveform with the output voltage waveform, thereby improving the power factor, reducing harmonic content, and improving the power quality of the grid. The PFC inductor module helps achieve high-efficiency power conversion in the control circuit's three-phase power supply module.

[0051] An active PFC module comprises a rectifier module and pre-amplifier power components. It's a module designed to improve the power factor of a power supply module in a control circuit. The rectifier module corrects and adjusts the current waveform of the three-phase power supply output to produce a stable DC current, reducing harmonic content and improving power quality. The pre-amplifier power components typically include power transistors, MOSFETs, or other switching devices. These components control the direction and magnitude of the current to achieve efficient power conversion.

[0052] The non-electrolytic capacitor module is connected to the active PFC module. The non-electrolytic capacitor module is used as the first bus capacitor between the first positive bus and the first negative bus. The non-electrolytic capacitor module is selected as the first bus capacitor. The non-electrolytic capacitor module is a small-capacity film capacitor. The small-capacity film capacitor is used instead of the conventional large-capacity electrolytic capacitor as the first bus capacitor. Because the capacitance value of the small-capacity film capacitor is small, when the compressor abnormally stops, the small-capacity film capacitor can reduce the energy value of the compressor feedback to the first bus voltage, thereby avoiding the first bus voltage from rising and overshooting.

[0053] In some embodiments of the present invention, the non-electrolytic capacitor module includes a first non-electrolytic capacitor C11 and a second non-electrolytic capacitor C22, which are connected in series between the first positive bus and the first negative bus. Both the first non-electrolytic capacitor C11 and the second non-electrolytic capacitor C22 are small-capacity film capacitors. By using two small-capacity film capacitors instead of conventional large-capacity electrolytic capacitors as the first bus capacitor between the first positive bus and the first negative bus, the small-capacity film capacitors can reduce the energy value fed back to the first bus voltage when the compressor abnormally shuts down, effectively preventing the first bus voltage from overshooting, achieving overvoltage protection, and improving the stability of the first bus voltage.

[0054] In some embodiments of the present invention, the single-phase power supply module includes a rectifier module, an electrolytic capacitor module, and a switching power supply module. The rectifier module is connected to the electrolytic capacitor module, and the electrolytic capacitor module is connected to the switching power supply module. The rectifier module is connected to the single-phase power supply port through a switching component SW1. The electrolytic capacitor module is used as a bus capacitor between the second positive bus and the second negative bus.

[0055] The single-phase power module is connected to the single-phase power port via the switch component SW1. The single-phase power port can be any one of the three-phase power ports. The single-phase power module includes a second positive bus and a second negative bus. The three-phase PFC module is connected to the three-phase power port. The three-phase PFC module includes a first positive bus and a first negative bus. The first positive bus is connected to the second positive bus via a first diode D1, and the first negative bus is connected to the second negative bus via a second diode D2. The single-phase power supply module includes a rectifier module and an electrolytic capacitor module. The rectifier module is connected to any one of the three-phase power ports via a switching component SW1 to rectify the power supply obtained from the three-phase power supply to output a stable DC power. The rectifier module is connected to the electrolytic capacitor module, and the output of the rectifier module outputs a stable DC power to the electrolytic capacitor module to charge it. The electrolytic capacitor module is used as the bus capacitor between the second positive bus and the second negative bus, and it is also used as the second bus voltage. Since the electrolytic capacitor module is connected to the switching power supply module, the second bus voltage can be used to power the switching power supply module, enabling the single-phase power supply module to operate normally.

[0056] In another embodiment of the present invention, the single-phase power supply module includes a rectifier module, an electrolytic capacitor module, and an output port. The rectifier module is connected to the electrolytic capacitor module, the electrolytic capacitor module is connected to the output port, and the output port is used to connect to a load. The rectifier module is connected to the single-phase power supply port through a switching component SW1, and the electrolytic capacitor module is used as a bus capacitor between the second positive bus and the second negative bus.

[0057] The single-phase power module is connected to the single-phase power port via the switch component SW1. The single-phase power port can be any one of the three-phase power ports. The single-phase power module includes a second positive bus and a second negative bus. The three-phase PFC module is connected to the three-phase power port. The three-phase PFC module includes a first positive bus and a first negative bus. The first positive bus is connected to the second positive bus via a first diode D1, and the first negative bus is connected to the second negative bus via a second diode D2. The single-phase power supply module includes a rectifier module and an electrolytic capacitor module. The rectifier module is connected to any one of the three-phase power ports via a switching component SW1 to rectify the power supply obtained from the three-phase power supply to output a stable DC power. The rectifier module is connected to the electrolytic capacitor module, and the output of the rectifier module outputs a stable DC power to the electrolytic capacitor module to charge it. The electrolytic capacitor module is used as the bus capacitor between the second positive bus and the second negative bus, and it is also used as the second bus voltage for the voltage between the second positive bus and the second negative bus. Since the electrolytic capacitor module is connected to the output port, and the output port is connected to the load (including but not limited to the switching power supply module), the second bus voltage can be used to supply power to the switching power supply module through the output port, enabling the single-phase power supply module to operate normally.

[0058] In this embodiment of the invention, the electrolytic capacitor module includes a first electrolytic capacitor C3 and a second electrolytic capacitor C4. The first electrolytic capacitor C3 and the second electrolytic capacitor C4 are connected in series and then connected between the second positive bus and the second negative bus. Both the first electrolytic capacitor C3 and the second electrolytic capacitor C4 are small-capacity electrolytic capacitors. This embodiment of the invention does not limit the composition of the electrolytic capacitor module, and those skilled in the art can configure the electrolytic capacitor module according to actual conditions.

[0059] In some embodiments of the present invention, 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 is connected to a single-phase power supply port through a switch component SW1, the second AC terminal is connected to a reference ground, the first DC terminal is connected to a second positive bus, and the second DC terminal is connected to a second negative bus.

[0060] In this embodiment of the invention, the rectifier module is connected to a single-phase power supply port via a switch component SW1, and is also connected to an electrolytic capacitor module. The rectifier module includes a first AC terminal and a second AC terminal. The first AC terminal is connected to the single-phase power supply port via the switch component SW1, and the second AC terminal is connected to reference ground. It can be understood that the single-phase power supply port is connected to the first and second AC terminals via the switch component SW1. The current output from the three-phase power supply is transmitted to the first AC terminal of the rectifier module through the single-phase power supply port and the switch component SW1. The rectifier module rectifies the power supply obtained from the three-phase power supply through the single-phase power supply port to output stable DC power. The rectifier module also includes a first DC terminal and a second DC terminal. The first DC terminal is connected to a second positive bus, and the second DC terminal is connected to a second negative bus. The DC power is transmitted to the second positive bus and the second negative bus through the first DC terminal and the second DC terminal, thereby rectifying the current output from the three-phase power supply. The rectifier module is connected to the electrolytic capacitor module. The output of the rectifier module provides a stable DC current to the electrolytic capacitor module to charge it. The electrolytic capacitor module serves as the bus capacitor between the second positive bus and the second negative bus. Therefore, the voltage across the electrolytic capacitor module is used as the second bus voltage, which powers the switching power supply module, enabling the single-phase power supply module to operate normally.

[0061] In some embodiments of the present invention, the rectifier module includes a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6. The anode of the third diode D3 is connected to the first AC terminal, and the cathode of the third diode D3 is connected to the second positive bus. The anode of the fourth diode D4 is connected to the second negative bus, and the cathode of the fourth diode D4 is connected to the second AC terminal. The anode of the fifth diode D5 is connected to the first DC terminal, and the cathode of the fifth diode D5 is connected to the second positive bus. The anode of the sixth diode D6 is connected to the second negative bus, and the cathode of the sixth diode D6 is connected to the second DC terminal. The rectifier module rectifies the power supply obtained from the three-phase power supply through the single-phase power port, forming a rectifier circuit consisting of a three-phase power supply—single-phase power port—switch component SW1—first AC terminal—third diode D3—fourth diode D4—second AC terminal—fifth diode D5—first DC terminal—second DC terminal—sixth diode D6. The rectifier circuit rectifies the current to output a stable DC power. The rectifier module is connected to the electrolytic capacitor module. The output of the rectifier module outputs a stable DC power to the electrolytic capacitor module to charge it. The electrolytic capacitor module is used as the bus capacitor between the second positive bus and the second negative bus. The voltage between the second positive bus and the second negative bus is used as the second bus voltage. The second bus voltage is used to supply power to the switching power supply module, enabling the single-phase power supply module to operate normally.

[0062] In some embodiments of the present invention, the switching component SW1 is a normally closed switch. The switching component SW1 includes a switch state trigger port, which is used to receive a switch state trigger signal. The switch state trigger signal comes from the bus voltage between the first positive bus and the first negative bus, or is issued by the controller according to the duration of the power supply to the three-phase PFC module. When the switching component SW1 receives the switch state trigger signal through the switch state trigger port, it switches from the closed state to the open state.

[0063] The three-phase power port connects to a three-phase power supply. The three-phase PFC module is also connected to the three-phase power port, and includes a first positive bus and a first negative bus. The single-phase power module is connected to a single-phase power port via a switch component SW1. The single-phase power port can be any one of the three-phase power ports, and includes a second positive bus and a second negative bus. The first positive bus is connected to the second positive bus via a first diode D1, and the first negative bus is connected to the second negative bus via a second diode D2. The switch component SW1 is a normally closed switch. A normally closed switch is a switch that is closed when no external force is applied. This means that when the normally closed switch is not activated or subjected to external force, the circuit is connected, and current can flow. When the normally closed switch is activated, such as by pressing, moving, or other operations, the switch opens, thereby cutting off the circuit.

[0064] The switching component SW1 includes a switch state trigger port, which is used to receive a switch state trigger signal. The switch state trigger signal includes a switch SW1 on signal and a switch SW1 off signal.

[0065] In one embodiment, when the three-phase power supply of the control circuit is initially powered on, the switch component SW1 is in the closed state. The current and voltage output by the three-phase power supply are delivered to the single-phase power module through the switch component SW1. The single-phase power module works normally. When the control circuit is powered on and the three-phase PFC module is powered on for a preset duration threshold, the controller sends a trigger signal to indicate that the switch component SW1 is disconnected based on the duration of power supply to the three-phase PFC module. When the switch state trigger port receives the trigger signal of the switch component SW1 being disconnected, the switch component SW1 switches from the closed state to the open state according to the trigger signal of the switch component SW1 being disconnected. At this time, the first bus voltage between the first positive bus and the first negative bus of the three-phase PFC module supplies power to the single-phase power module through the first diode D1 and the second diode D2.

[0066] In another embodiment, when the three-phase power supply of the control circuit is initially powered on, the switch component SW1 is in the closed state. The current and voltage output by the three-phase power supply are delivered to the single-phase power module through the switch component SW1. The single-phase power module is working normally, and the three-phase PFC module is powered on. When the first bus voltage between the first positive bus and the first negative bus of the three-phase PFC module is abnormally over-voltage, the first bus voltage between the first positive bus and the first negative bus sends a trigger signal to indicate that the switch component SW1 is open. When the switch state trigger port receives the trigger signal of the switch component SW1 being open, the switch component SW1 switches from the closed state to the open state according to the trigger signal of the switch component SW1 being open. When the voltage across the first busbar between the first positive and first negative busbars is abnormally high, it is higher than the voltage across the second busbar between the second positive and second negative busbars, creating a voltage difference between them. In this situation, the first busbar voltage supplies power to the single-phase power module through the first diode D1 and the second diode D2. A current absorption circuit is formed inside the single-phase power module, absorbing the energy fed back from the compressor to the area between the first positive and first negative busbars via the first and second diodes. This reduces the energy value fed back to the first busbar voltage, effectively preventing overshoot and overvoltage protection. This improves the stability of the first busbar voltage, preventing damage to the power device module from excessively high voltage, extending the lifespan of the power device module, and also extending the lifespan of the control circuit.

[0067] It should be noted that in some embodiments of the present invention, the switch component SW1 is a relay. Those skilled in the art can set the switch component SW1 to a normally closed switch according to the actual situation. The present invention does not restrict the selection of the switch component SW1.

[0068] Reference Figure 4 As shown, Figure 4 This is a flowchart of a control method for a control circuit of an air conditioning system provided in an embodiment of the present invention. The control method for the control circuit of the air conditioning system includes, but is not limited to, steps S100 to S200. Specifically,

[0069] Step S100: Calculate the duration of power supply to the three-phase PFC module;

[0070] Step S200: Control the on / off state of the switching component according to the duration.

[0071] In this embodiment of the invention, the control circuit of the air conditioning system includes a three-phase power port, a three-phase PFC module, and a single-phase power module. The three-phase PFC module is connected to the three-phase power port, and the single-phase power module is connected to the single-phase power port via a switching component. The single-phase power port can be any one of the three-phase power ports. The three-phase PFC module includes a first positive bus and a first negative bus, and the single-phase power module includes a second positive bus and a second negative bus. The first positive bus is connected to the second positive bus via a first diode, and the first negative bus is connected to the second negative bus via a second diode. The three-phase power port is connected to the three-phase power supply, and the three-phase PFC module is connected to the three-phase power port. The current output from the three-phase power supply is transmitted to the three-phase PFC module through the three-phase power port, thereby supplying power to the three-phase PFC module.

[0072] The control method of the air conditioning system control circuit includes: statistically analyzing the duration of power supplied to the three-phase PFC module, and controlling the control switch to be in a closed or open state based on the statistically calculated duration of power supply to the three-phase PFC module. When the control switch is in the closed state based on the duration, power is supplied to the single-phase power module through the single-phase power port to ensure normal operation of the single-phase power module. When the control switch is in the open state based on the duration, the loop between the single-phase power port and the single-phase power module is broken. Since the first positive bus is connected to the second positive bus through the first diode, and the first negative bus is connected to the second negative bus through the second diode, the single-phase power module obtains power from the three-phase PFC module and charges the single-phase power module using the first bus voltage between the first positive bus and the first negative bus of the three-phase PFC module. When the compressor malfunctions, the energy fed back by the compressor can cause the voltage of the first bus between the first positive bus and the first negative bus to rise, which can easily lead to overshoot of the first bus voltage. Since there is a voltage difference between the voltage of the first bus between the first positive bus and the first negative bus and the voltage of the second bus between the second positive bus and the second negative bus, the first bus voltage supplies power to the single-phase power module through the first diode and the second diode. The single-phase power module forms a current absorption circuit inside, which absorbs the energy fed back by the compressor between the first positive bus and the first negative bus through the first diode and the second diode, thereby reducing the energy value fed back by the compressor to the first bus voltage. This effectively avoids the first bus voltage from rising and overshooting, realizes overvoltage protection, improves the stability of the first bus voltage, and thus avoids damage to the power device module due to excessive first bus voltage, thereby increasing the service life of the power device module and the control circuit.

[0073] Reference Figure 5 As shown, Figure 5 This is a flowchart of a method for controlling the on / off state of a switching component based on a duration according to an embodiment of the present invention. The method for controlling the on / off state of a switching component based on a duration includes, but is not limited to, steps S100 to S210. Specifically,

[0074] Step S100: Calculate the duration of power supply to the three-phase PFC module;

[0075] Step S210: When the duration is greater than or equal to the preset duration threshold, the control switch is in the off state so that the single-phase power module can obtain power from the three-phase PFC module.

[0076] In some embodiments of the present invention, a three-phase power port is connected to a three-phase power supply; a three-phase PFC module is connected to the three-phase power port, and the three-phase PFC module includes a first positive bus and a first negative bus; a single-phase power module is connected to a single-phase power port via a switching component, and the single-phase power port can be any one of the three-phase power ports, and the single-phase power module includes a second positive bus and a second negative bus; the first positive bus is connected to the second positive bus via a first diode, and the first negative bus is connected to the second negative bus via a second diode. The switching component is a normally closed switch, which is a switch that is closed when no external force is applied. It is understood that when the normally closed switch is not activated or an external force is applied, the circuit is connected, and current can flow. When the normally closed switch is activated, the switch opens, thereby cutting off the circuit.

[0077] The method for controlling the on / off state of the control switch component during duration includes: First, calculating the duration of power supply to the three-phase PFC module; then, comparing the calculated duration of power supply to the three-phase PFC module with a preset duration threshold. When the calculated duration of power supply to the three-phase PFC module is greater than or equal to the preset duration threshold, it indicates that the three-phase PFC module has completed power-on and is in a stable state, ensuring that the three-phase PFC module has the ability to supply power to the single-phase power module. At this time, the control switch component is in the off state, allowing the single-phase power module to obtain power from the three-phase PFC module and charge the single-phase power module using the first bus voltage between the first positive bus and the first negative bus of the three-phase PFC module.

[0078] If the compressor malfunctions, the energy fed back by the compressor will cause the voltage of the first bus between the first positive bus and the first negative bus to rise, which can easily lead to overshoot of the first bus voltage. Since there is a voltage difference between the voltage of the first bus between the first positive bus and the first negative bus and the voltage of the second bus between the second positive bus and the second negative bus, the first bus voltage supplies power to the single-phase power module through the first diode and the second diode. The single-phase power module forms a current absorption circuit inside, which absorbs the energy fed back by the compressor between the first positive bus and the first negative bus through the first diode and the second diode, thereby reducing the energy value fed back to the first bus voltage by the compressor. This effectively avoids the first bus voltage from rising and overshooting, realizes overvoltage protection, improves the stability of the first bus voltage, and thus avoids damage to the power device module due to excessive first bus voltage, thereby increasing the service life of the power device module and the control circuit.

[0079] Reference Figure 6 As shown, Figure 6This is a flowchart of a method for controlling the on / off state of a switching component based on a duration according to an embodiment of the present invention. The method for controlling the on / off state of a switching component based on a duration includes, but is not limited to, steps S100 to S220. Specifically,

[0080] Step S100: Calculate the duration of power supply to the three-phase PFC module;

[0081] Step S220: When the duration is less than the preset duration threshold, the switch component is kept in the closed state so that the single-phase power module can obtain power from the single-phase power port.

[0082] In some embodiments of the present invention, a three-phase power port is connected to a three-phase power supply; a three-phase PFC module is connected to the three-phase power port, and the three-phase PFC module includes a first positive bus and a first negative bus; a single-phase power module is connected to a single-phase power port via a switching component, and the single-phase power port is any one of the three-phase power ports, and the single-phase power module includes a second positive bus and a second negative bus; the first positive bus is connected to the second positive bus via a first diode, and the first negative bus is connected to the second negative bus via a second diode. The switching component is a normally closed switch.

[0083] The method for controlling the on / off state of the switching component based on the duration includes: when the three-phase power supply is powered on, the single-phase power module obtains power from the single-phase power port. The current and voltage output by the three-phase power supply are delivered to the single-phase power module through the switching component to enable the single-phase power module to operate normally. The duration of power supply to the three-phase PFC module is statistically analyzed and compared with a preset duration threshold. If the statistically analyzed duration of power supply to the three-phase PFC module is less than the preset duration threshold, it indicates that the three-phase PFC module is not in a stable state. In this case, the switching component remains closed, and the single-phase power module continues to obtain power from the single-phase power port to ensure normal operation.

[0084] Reference Figure 7 As shown, Figure 7This is a schematic diagram of the structure of a running control device 1000 provided in an embodiment of the present invention. It includes a processor 1001, which can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the method provided in the embodiment of the present invention; and a memory 1002, which can be implemented using a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM), etc. The memory 1002 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1002 and is called and executed by the processor 1001. The input / output interface 1003 is used to implement information input and output. The communication interface 1004 is used to realize communication interaction between this device and other devices. Communication can be realized through wired means (such as USB, network cable, etc.) or through wireless means (such as mobile network, WIFI, Bluetooth, etc.). The bus transmits information between the various components of the device (such as the processor 1001, memory 1002, input / output interface 1003 and communication interface 1004). The processor 1001, memory 1002, input / output interface 1003 and communication interface 1004 are connected to each other within the device through the bus.

[0085] This invention also provides an air conditioner, which includes the control circuit of the air conditioning system described in the above embodiments, or the operation control device described in the above embodiments.

[0086] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0087] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A control circuit for an air conditioning system, characterized in that, include: Three-phase power port, used to connect a three-phase power supply; A three-phase PFC module is connected to the three-phase power supply port. The three-phase PFC module includes a first positive bus and a first negative bus. A single-phase power module is connected to a single-phase power port via a switching component. The single-phase power port is any one of the three-phase power ports. The single-phase power module includes a second positive bus and a second negative bus. The first positive busbar is connected to the second positive busbar via a first diode, and the first negative busbar is connected to the second negative busbar via a second diode.

2. The control circuit according to claim 1, characterized in that, The anode of the first diode is connected to the first positive bus, and 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.

3. The control circuit according to claim 1, characterized in that, The three-phase PFC module includes a PFC inductor module, an active PFC module, and a non-electrolytic capacitor module. The PFC inductor module, the active PFC module, and the non-electrolytic capacitor module are connected in sequence. The PFC inductor module is connected to the three-phase power supply port, and the non-electrolytic capacitor module is used as a bus capacitor between the first positive bus and the first negative bus.

4. The control circuit according to claim 1, characterized in that, The single-phase power supply module includes a rectifier module and an electrolytic capacitor module. The rectifier module is connected to the electrolytic capacitor module. The rectifier module is connected to the single-phase power supply port through the switching component. The electrolytic capacitor module is used as a bus capacitor between the second positive bus and the second negative bus.

5. The control circuit according to claim 4, characterized in that, 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 is connected to the single-phase power supply port through the switching component. The second AC terminal is connected to the reference ground. The first DC terminal is connected to the second positive bus, and the second DC terminal is connected to the second negative bus.

6. The control circuit according to any one of claims 1 to 5, characterized in that, The switching component is a normally closed switch. The switching component includes a switch state trigger port, which is used to receive a switch state trigger signal. The switch state trigger signal comes from the bus voltage between the first positive bus and the first negative bus, or is issued by the controller according to the duration of power supplied to the three-phase PFC module. When the switch component receives the switch state trigger signal through the switch state trigger port, it switches from the closed state to the open state.

7. A control method for a control circuit of an air conditioning system, characterized in that, The control circuit includes a three-phase power port, a three-phase PFC module, and a single-phase power module. The three-phase PFC module is connected to the three-phase power port, and the single-phase power module is connected to the single-phase power port through a switching component. The single-phase power port can be any one of the three-phase power ports. The three-phase PFC module includes a first positive bus and a first negative bus, and the single-phase power module includes a second positive bus and a second negative bus. The first positive bus is connected to the second positive bus through a first diode, and the first negative bus is connected to the second negative bus through a second diode. The control method includes: The duration of power supplied to the three-phase PFC module is recorded. The on / off state of the switching component is controlled according to the duration.

8. The control method according to claim 7, characterized in that, The switching component is a normally closed switch; The step of controlling the on / off state of the switching component according to the duration includes: When the duration is greater than or equal to a preset duration threshold, the switching component is controlled to be in the off state so that the single-phase power module obtains power from the three-phase PFC module.

9. The control method according to claim 7, characterized in that, The switching component is a normally closed switch; The step of controlling the on / off state of the switching component according to the duration includes: When the duration is less than a preset duration threshold, the switch component remains in a closed state so that the single-phase power module obtains power from the single-phase power port.

10. An operation control device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a control method for the control circuit of an air conditioning system as described in any one of claims 7 to 9.

11. An air conditioner, characterized in that, It includes the control circuit of the air conditioning system according to any one of claims 1 to 6, or the operation control device according to claim 10.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform a control method for the control circuit of the air conditioning system as described in any one of claims 7 to 9.

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