Power supply control system of compressor and air conditioner

Abstract

The invention provides a power supply control system of a compressor and an air conditioner, and relates to the technical field of compressors, the power supply control system of the compressor comprises at least two charging modules and a frequency converter, the at least two charging modules are correspondingly connected with at least two paths of alternating current respectively, and the at least two paths of alternating current are rectified into direct current to supply power to the frequency converter; due to the fact that direct-current voltage exists at the output ends of at least two charging modules at the same time, when one power supply in the power supply control system of the compressor is powered down, the other power supplies continuously supply power to the compressor uninterruptedly. The compressor of the air conditioner continuously operates without shutdown, the cooling capacity is uninterrupted, and the stability of the air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a power supply control system and an air conditioner for a compressor. Background Art

[0002] With the advent of the intelligent and information age, the development and construction of data centers are in a rapid period. Users are paying more and more attention to the energy-saving effects of products, upgrading from previous fixed-frequency products to variable-frequency products, including compressors, which are also required to use variable-frequency drives; at the same time, strict requirements are put forward for uninterrupted cooling capacity. In order to ensure the continuous operation and stability of the air-conditioning system, two independent power supplies are often used to power the air-conditioning system through a switching device. This configuration can provide higher reliability. If one of the power supplies fails, it can be switched to another power supply to take over the power supply, thereby avoiding the air-conditioning system from stopping working due to power problems.

[0003] At present, the commonly used switching devices generally adopt dual power conversion switch switching and dual contactor switching technology, but the dual power conversion switch switching and dual contactor switching are both driven by coil excitation, and there is a conversion process from open to closed contacts. The dual power conversion switch switching and dual contactor switching have a conversion time of 100ms~500ms during the switching process. During this period, the input power is cut off, the input end of the compressor's inverter is undervoltage, and the power supply is quickly stopped, causing the compressor to shut down. It takes more than 60s for the compressor to restart and then increase the frequency to high frequency. During this period, the cooling capacity is lost, which reduces the stability of the air conditioner. Summary of the invention

[0004] The object of the present invention is to provide a power supply control system for a compressor and an air conditioner, which can ensure that when one power supply line in the power supply control system of the compressor is powered off, other power supplies continue to supply power to the compressor uninterruptedly, and the compressor of the air conditioner continues to run without stopping, so as to achieve the requirement of uninterrupted cooling.

[0005] In order to solve the above technical problems, the present invention provides a power supply control system for a compressor, comprising:

[0006] At least two charging modules, the input ends of at least two charging modules are respectively connected to at least two AC power lines, the output ends are connected in parallel and the common end after parallel connection is connected to the input end of the inverter, and is used to rectify the corresponding AC power into DC power; wherein, there is a DC voltage at the output ends of at least two of the charging modules at the same time;

[0007] The inverter is connected to the compressor of the air conditioner and is used to invert the direct current into alternating current to power the compressor.

[0008] Optionally, also include:

[0009] At least two anti-reverse modules are respectively arranged at the output end of each charging module in a one-to-one correspondence, and are used to prevent current backflow between the charging modules.

[0010] Optionally, also include:

[0011] At least two fuses are respectively arranged at the output end of each charging module, and are used to disconnect the circuit between the charging module and the inverter when the current output by the charging module is greater than a preset current threshold.

[0012] Optionally, also include:

[0013] A filter module, wherein a first end of the filter module is connected to a common end of at least two of the charging modules, and a second end of the filter module is connected to an input end of the frequency converter.

[0014] Optionally, the filtering module includes at least two filtering capacitors, and the capacitance values ​​of at least two of the filtering capacitors are different.

[0015] Optionally, for any of the charging modules, the charging module includes:

[0016] A power factor corrector, wherein the input end of the power factor corrector is connected to the corresponding alternating current, and the output end is connected to the input end of the DC / DC converter, and is used to convert the corresponding alternating current into direct current and perform power factor correction;

[0017] The DC / DC converter, whose output end is connected to the input end of the frequency converter, is used to perform voltage conversion on the direct current.

[0018] Optionally, the charging module further includes:

[0019] A first EMI filter, which is arranged at the input end of the power factor corrector and is used for performing EMI filtering on the AC power corresponding to the first EMI filter;

[0020] A second EMI filter is provided at the output end of the DC / DC converter and is used for performing EMI filtering on the direct current at the output end of the DC / DC converter.

[0021] Optionally, the charging module further includes:

[0022] A processor is used to send the output current of its own charging module to the processors in each of the other charging modules, obtain the output current of the charging modules sent by the processors in each of the other charging modules, determine the average current based on all the output currents, and control the power factor corrector and DC / DC converter corresponding to itself so that the output voltages of all DC / DC converters are the same and the output current of the DC / DC converter is the average current.

[0023] Optionally, the charging module further includes:

[0024] The processor is used to control the power factor corrector and DC / DC converter corresponding to itself so as to output direct current to the inverter, wherein the output voltage of each charging module is different, and the load capacity of each charging module is not less than the total load of the inverter.

[0025] In order to solve the above technical problems, the present invention also provides an air conditioner, including a compressor, and also including a power supply control system of the compressor as described above, wherein the power supply control system of the compressor is connected to the compressor.

[0026] The present application provides a power supply control system for a compressor and an air conditioner. The power supply control system for the compressor includes at least two charging modules and a frequency converter, wherein the at least two charging modules are used to rectify at least two AC powers into DC powers to power the frequency converter, and then use the frequency converter to invert the DC powers into AC powers to power the compressor. Since DC voltage exists at the output ends of at least two of the charging modules at the same time, when one power supply in the power supply control system of the compressor loses power, the other power supplies continue to power the compressor uninterruptedly, and the compressor of the air conditioner continues to run without stopping, and the cooling capacity is uninterrupted, thereby improving the stability of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of a power supply control system for a compressor provided by the present invention;

[0029] Figure 2 A schematic structural diagram of a specific compressor power supply control system provided by the present invention. DETAILED DESCRIPTION

[0030] The core of the present invention is to provide a power supply control system and an air conditioner for a compressor, which can ensure that when one power supply line in the power supply control system of the compressor is powered off, other power supplies continue to supply power to the compressor uninterruptedly, and the compressor of the air conditioner continues to run without stopping, so as to achieve the requirement of uninterrupted cooling.

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] At present, the commonly used switching devices generally adopt dual power conversion switch switching and dual contactor switching technology, but the dual power conversion switch switching and dual contactor switching are both driven by coil excitation, and there is a conversion process from open to closed contacts. The dual power conversion switch switching and dual contactor switching have a conversion time of 100ms~500ms during the switching process. During this period, the input power is cut off, the input end of the compressor's inverter is undervoltage, and the power supply is quickly stopped, causing the compressor to shut down. It takes more than 60s for the compressor to restart and then increase the frequency to high frequency. During this period, the cooling capacity is lost, which reduces the stability of the air conditioner.

[0033] In order to solve the above technical problem, the present invention provides a power supply control system for a compressor.

[0034] Specifically, see Figure 1 As shown, Figure 1 A schematic diagram of the structure of a power supply control system for a compressor provided by the present invention. Figure 1 In the example, at least two AC power supplies including a power supply I and a power supply II are taken as an example, and correspondingly, there are two charging modules.

[0035] The power supply control system of the compressor includes:

[0036] At least two charging modules 1, the input terminals of at least two charging modules 1 are connected to at least two AC power lines respectively, the output terminals are connected in parallel and the common terminal after parallel connection is connected to the input terminal of the inverter 2, which is used to rectify the corresponding AC power into DC power; wherein, the output terminals of at least two charging modules 1 have DC voltage at the same time;

[0037] The inverter 2 is connected to the compressor 3 of the air conditioner and is used for inverting direct current into alternating current to supply power to the compressor 3 .

[0038] The power supply control system of the compressor includes at least two charging modules 1 and a frequency converter 2. Among them, the AC power is input from the input end of the charging module 1, and the input AC power is rectified and power factor corrected through the EMI (Electromagnetic Interference) filter and PFC (Power Factor Correction) inside the charging module 1, and then the DC / DC converter outputs stable and controllable voltage and current. It should be noted that the charging module 1 supports three-phase AC and DC input, and the charging modules 1 can communicate with each other using an isolated CAN communication interface, so that the charging module 1 monitors the voltage and current of the output end of all charging modules 1, and issues instructions to each charging module 1 through CAN communication to realize the functions of voltage regulation, current limiting, module power on and off of the charging module 1. In addition, to ensure the safe and reliable operation of the power supply control system of the compressor, a C-type circuit breaker with a rated current of 80A or more can be used between the input end of each charging module 1 and the corresponding AC power. When the compressor 3 is first powered, there are two power supply modes. Correspondingly, when one power supply fails or loses power, there are two ways to allow other power supplies that are not shut down or lose power to continue to supply power to the compressor 3 uninterruptedly.

[0039] In a specific implementation, there is no master-slave relationship among the charging modules 1, and simultaneous output is allowed to power the compressor 3. In this way, when the circuit breakers between the input terminals of all charging modules 1 and their corresponding AC power are closed, each charging module 1 outputs current in an equalized manner to power the inverter 2 at the same time. When one power supply is powered off or powered off, the charging modules 1 corresponding to the other power supplies that are not powered off or powered off adjust their respective output currents and continue to output current in an equalized manner to power the inverter 2.

[0040] In another specific embodiment, each charging module 1 has a master-slave relationship, one charging module 1 is a main charging module and outputs current, and the other charging modules 1 are standby charging modules, and the standby charging modules include a first standby charging module, a second standby charging module, and a third standby charging module, etc. In this way, the output voltages of the main charging module, the standby charging module, and each standby charging module differ by a preset voltage in sequence, and the output voltage of the main charging module is the largest, wherein the preset voltage may be 10V. Under normal circumstances, the main charging module and each standby charging module have voltage outputs, and when the circuit breakers between the input ends of all charging modules 1 and the corresponding alternating current are closed, only the main charging module has output current, and the output currents of the other standby charging modules are all 0, and they are in a hot standby state. When the power supply corresponding to the main charging module is powered off or loses power, the output current of the main charging module is 0, and the standby charging module with the largest output voltage starts to supply power to the inverter 2, so as to continue to supply power to the inverter 2 uninterruptedly.

[0041] It can be seen that the present embodiment provides a power supply control system for a compressor, each charging module 1 rectifies the corresponding AC power into DC power to power the inverter 2, and then the inverter 2 inverts the DC power into AC power to power the compressor 3. Since there is a DC voltage at the output ends of at least two of the charging modules at the same time, when one power supply in the power supply control system of the compressor is out of power or loses power, the other power supplies that have not been out of power or lost power continue to supply power to the compressor 3 uninterruptedly, and the compressor 3 of the air conditioner continues to run without stopping, and the cooling capacity is uninterrupted, thereby improving the stability of the air conditioner.

[0042] Based on the above embodiments:

[0043] Please refer to Figure 2 As shown, Figure 2 A schematic structural diagram of a specific compressor power supply control system provided by the present invention.

[0044] As an optional embodiment, it also includes:

[0045] At least two anti-reverse modules 4 are respectively disposed at the output end of each charging module 1 in a one-to-one correspondence, and are used to prevent current backflow between the charging modules 1 .

[0046] In this embodiment, in order to prevent the current backflow between the charging modules 1 from generating a circulating current and causing safety problems, the present application configures an anti-reverse module 4 between each charging module 1 and the inverter 2 to avoid mutual influence between the charging modules 1. Even if a single charging module 1 has a short circuit or other faults, it will not cause abnormal operation of other charging modules 1. And when the charging modules 1 are in a master-slave relationship, it is ensured that the charging module 1 with the highest output voltage among the charging modules 1 will give priority to powering the inverter 2 and will not affect other charging modules 1. It should be noted that the anti-reverse module 4 can be an anti-reverse diode.

[0047] It can be seen that in this embodiment, an anti-reverse module 4 is configured between each charging module 1 and the inverter 2 to avoid mutual influence between the charging modules 1 and ensure that each charging module 1 safely and reliably supplies power to the inverter 2.

[0048] As an optional embodiment, it also includes:

[0049] At least two fuses 5 are respectively disposed at the output end of each charging module 1 in a one-to-one correspondence, and are used to disconnect the circuit between the charging module 1 and the inverter 2 when the current output by the charging module 1 is greater than a preset current threshold.

[0050] In this embodiment, when a short-circuit fault occurs in the charging module 1, the circuit will be short-circuited, causing the power supply control system of the compressor to be unable to supply power to the inverter 2 normally, causing the compressor 3 to shut down. In order to avoid this situation, the present embodiment adds a fuse 5 to the output end of each charging module 1 to prevent the power supply control system of the entire compressor from short-circuiting when a short-circuit fault occurs in the charging module 1. Specifically, when a short-circuit fault occurs in a charging module 1, the fuse 5 corresponding to the charging module 1 will be blown due to the short circuit, isolating the short-circuit point and the inverter 2, and other charging modules 1 that have not failed can continue to supply power to the inverter 2 to ensure that the compressor 3 does not shut down.

[0051] It can be seen that the role of fuse 5 in the power supply control system of the compressor is mainly to provide short-circuit protection to ensure that when a short circuit occurs in one charging module 1, the charging module 1 is quickly cut off, and other charging modules 1 that have not failed can continue to supply power to the inverter 2 to ensure that the compressor 3 does not stop, thereby protecting the power supply control system of the entire compressor from damage.

[0052] As an optional embodiment, it also includes:

[0053] A filter module 6 , wherein a first end of the filter module 6 is connected to a common end of at least two charging modules 1 , and a second end of the filter module 6 is connected to an input end of the frequency converter 2 .

[0054] Specifically, in order to make the voltage input to the inverter 2 smoother and reduce pulsation, thereby providing a more stable input voltage, the present invention provides a filter module 6 for filtering out clutter to make the voltage input to the inverter 2 smoother.

[0055] It can be seen that the filter module 6 can effectively filter out the noise and interference components in the voltage input to the inverter 2, smooth the direct current, remove high-frequency noise, make the standard negative voltage more stable, and thus improve the quality of the voltage input to the inverter 2.

[0056] As an optional embodiment, the filtering module 6 includes at least two filtering capacitors, and the capacitance values ​​of the at least two filtering capacitors are different.

[0057] Specifically, the main function of the filter capacitor is to reduce the ripple amplitude of the DC power output by the charging module 1, thereby ensuring the normal operation of the circuit. The filter module 6 includes at least two filter capacitors, and the capacitance of at least two filter capacitors is different, so as to achieve more precise frequency adjustment and optimization according to specific needs, and jointly filter out clutter in different frequency bands, which can more effectively reduce the AC component of the voltage input from the inverter 2, making the input DC power smoother.

[0058] It can be seen that by using multiple filter capacitors with different capacitance values, a wider filtering frequency range can be achieved, thereby improving the filtering effect and enhancing the anti-interference ability of the circuit.

[0059] As an optional embodiment, for any charging module 1, the charging module 1 includes:

[0060] A power factor corrector, the input end of which is connected to the corresponding alternating current, and the output end is connected to the input end of the DC / DC converter, for converting the corresponding alternating current into direct current and performing power factor correction;

[0061] The DC / DC converter has an output end connected to the input end of the frequency converter 2 and is used to convert the voltage of the direct current.

[0062] In this embodiment, in order to reduce reactive power to improve the power factor of the system, thereby reducing power waste and improving system efficiency, the charging module 1 used in this embodiment includes a power factor corrector and a DC / DC converter. The power factor is an efficiency index that measures the conversion of electrical energy into useful work output in the power supply control system of the compressor. Its value is between 0 and 1, and ideally should be close to 1. When the power factor is low, a lot of electrical energy will be wasted, resulting in energy waste and equipment overheating. The power factor corrector improves the power factor by adding capacitance or inductance to make the waveforms of current and voltage more consistent, thereby reducing the reactive power component. In addition, PFC circuits include passive PFC circuits and active PFC circuits. Passive PFC circuits are usually suitable for small power supplies and use low-pass filters to suppress harmonic currents so that nonlinear devices can be used as linear loads; while active PFC circuits are suitable for larger power supplies. Active PFC circuits are composed of high-frequency inductors, switching tubes, capacitors and other components. They can convert 110V or 220V AC mains into DC high voltage of about 380V. Active PFC circuits are also small and light.

[0063] Furthermore, after the AC power is converted into DC power by the power factor corrector and the power factor is corrected, the DC / DC converter performs voltage conversion on the DC power after power factor correction. Specifically, when a power supply line is powered off or loses power, the output current of the charging module 1 where the power supply line is located is 0, and the charging modules 1 where the power supply lines are located receive the output current sent by the charging module 1 where the power supply lines are located. The charging module 1 controls the DC / DC converter to chop the DC power into a square wave (pulse wave) through PWM (Pulse width modulation) technology, and changes the output voltage of each charging module 1 by adjusting the duty cycle of the square wave.

[0064] It can be seen that the power factor corrector converts AC power into DC power through rectification, and performs power factor correction to reduce the reactive power component, making the current and voltage waveforms more consistent, improving energy utilization, and then converts the DC power after power factor correction into the DC power required to be output by the charging module 1 itself through the DC / DC converter, ensuring the stability of the DC input of the inverter 2.

[0065] As an optional embodiment, the charging module 1 further includes:

[0066] The transformer has an input end connected to an output end of the DC / DC converter and is used to perform voltage conversion on the direct current output by the DC / DC converter.

[0067] In order to further increase the voltage range of direct current, a transformer may be further provided in the charging module 1 for further voltage conversion of the direct current output by the DC / DC converter to meet the requirements of loads of different capacities.

[0068] As an optional embodiment, the charging module 1 further includes:

[0069] A first EMI filter, which is arranged at the input end of the power factor corrector and is used for performing EMI filtering on the AC power corresponding to the first EMI filter;

[0070] The second EMI filter is arranged at the output end of the DC / DC converter and is used for performing EMI filtering on the direct current at the output end of the DC / DC converter.

[0071] Because the power supply will carry high-frequency noise and electromagnetic interference during the transmission process, these interferences may affect the normal operation of the electronic equipment. In order to effectively suppress these high-frequency noises, protect the equipment from interference, and ensure the stable operation of the equipment, the charging module 1 used in this embodiment also includes a first EMI filter and a second EMI filter. The EMI filter is a filter circuit composed of capacitors, inductors and resistors. The characteristic of the EMI filter is that the greater the impedance adaptation between the input and output sides of the EMI filter and the power supply and load sides, the more effective the attenuation of electromagnetic interference. The EMI filter can effectively filter out the frequency point of a specific frequency in the power supply / frequencies outside the frequency point, and obtain a power supply signal of a specific frequency / power supply signal after eliminating a specific frequency.

[0072] It can be seen that the charging module 1 used in this embodiment also includes a first EMI filter and a second EMI filter, which can effectively filter out the high-frequency noise and electromagnetic interference carried by the power supply during the transmission process, improve the working stability of the power supply control system of the compressor, and thus ensure the stability and reliability of each device.

[0073] As an optional embodiment, the charging module 1 further includes:

[0074] A processor is used to send the output current of its own charging module 1 to the processors in other charging modules 1, obtain the output current of the charging modules 1 sent by the processors in other charging modules 1, determine the average current based on all the output currents, and control the corresponding power factor corrector and DC / DC converter so that the output voltages of all DC / DC converters are the same and the output current of the DC / DC converter is the average current.

[0075] If there is no master-slave relationship among the charging modules 1, each charging module 1 is allowed to output power to the compressor 3 at the same time. In this way, when the circuit breakers between the input terminals of all charging modules 1 and the corresponding AC power are closed, the processor inside each charging module 1 sends the output current of its own charging module 1 to the processors in other charging modules 1, and receives the output current of its own charging module 1 sent by the processors in other charging modules 1, determines the average current based on the output current of all charging modules 1, adjusts the output voltage of each charging module 1 to be the same, and the output current of each charging module 1 is the average current.

[0076] It should be noted that the arithmetic mean of all output currents can be used as the average current, and the output current of each charging module 1 can be adjusted to be close to the average current through PID control (proportional-integral-derivative control, i.e., proportional-integral-derivative control), so as to achieve the current output of each charging module 1 to power the inverter 2, thereby improving the stability and reliability of the system. Among them, PID control includes three parts: proportional, integral and differential, which correspond to the adjustment of current error, cumulative error and rate of change error respectively, so as to adjust the output control amount so that the control process is close to the expected value and remains stable. The importance of PID control parameter adjustment lies in improving the response speed and stability of the power supply control system of the compressor and reducing the steady-state error.

[0077] In addition, when one power supply line is out of power or powered off, the output current of the charging module 1 where this power supply line is located is 0, and the processors in the charging modules 1 where other power supplies are located receive the output currents of the charging modules 1 where this power supply line is located sent by the processors in the charging modules 1 where this power supply line is located. At this time, the arithmetic mean of the output currents of the charging modules 1 where the power supplies that have not been out of power or powered off are located can be recalculated, and the arithmetic mean of the output currents of the charging modules 1 where the power supplies that have not been out of power or powered off are used as the new average current. The output current of the charging modules 1 where the power supplies that have not been out of power or powered off are adjusted through PID control to be close to the new average current, so that the power supplies of other lines that have not been out of power or powered off continue to supply power to the inverter 2 uninterruptedly.

[0078] It can be seen that if there is no master-slave relationship between the charging modules 1, each charging module 1 is allowed to output at the same time to power the compressor 3. When one power supply is out of power or loses power, the charging modules 1 corresponding to the other power supplies that have not been out of power or lost power adjust their respective output currents to continue to output current balancing to power the inverter 2, so as to achieve continuous operation of the air conditioner compressor 3 without stopping and uninterrupted cooling.

[0079] As an optional embodiment, the charging module 1 further includes:

[0080] The processor is used to control the corresponding power factor corrector and DC / DC converter to output direct current to the inverter 2, wherein the output voltage of each charging module 1 is different, and the load capacity of each charging module 1 is not less than the total load of the inverter 2.

[0081] If each charging module 1 has a master-slave relationship, one charging module 1 is a main charging module and outputs current, and the other charging modules 1 are standby as standby charging modules, and the standby charging modules include a first standby charging module, a second standby charging module, and a third standby charging module, etc. In this way, the output voltages of the main charging module and each standby charging module differ by a preset voltage in sequence, and the output voltage of the main charging module is the largest, wherein the preset voltage may be 10V. Under normal circumstances, both the main charging module and each standby charging module have voltage outputs, and when the circuit breakers between the input terminals of all charging modules 1 and the corresponding alternating current are closed, only the main charging module has output current, and the output currents of the other standby charging modules are all 0, and they are in a hot standby state.

[0082] When the power supply of the main charging module is out of power or loses power, the output current of the main charging module is 0, and the processors in the backup charging modules receive the output current of the main charging module sent by the processor in the main charging module, and the processor in the backup charging module with the largest output voltage starts to supply power to the inverter 2, so that the power supplies of other routes that are not out of power or lose power continue to supply power to the inverter 2 uninterruptedly. In order to ensure that the inverter 2 can operate normally when each charging module 1 independently outputs power to the inverter 2, the load capacity requirement of each charging module is not less than the total load of the inverter 2.

[0083] It can be seen that if the charging modules 1 have a master-slave relationship, one charging module 1 is the main charging module and outputs current, and the other charging modules 1 are standby charging modules. When the power supply corresponding to the main charging module is out of power or loses power, the standby charging module with the largest output voltage starts to supply power to the inverter 2, so that the compressor 3 of the air conditioner can continue to run without stopping and the cooling capacity is uninterrupted.

[0084] In practical applications, if the AC power connected to each charging module 1 is a mains power supply with the same cost, it is possible to set the charging modules 1 to have no master-slave relationship, and each charging module 1 simultaneously outputs power to the compressor 3. If the cost of the AC power connected to each charging module 1 is different, it is possible to set the charging modules 1 to have a master-slave relationship, with the charging module 1 with a low cost as the main charging module and the other charging modules 1 as the backup charging modules, thereby reducing costs and achieving good economic efficiency.

[0085] The present invention further provides an air conditioner, comprising a compressor 3 , and also comprising a power supply control system of the compressor as described above, wherein the power supply control system of the compressor is connected to the compressor 3 .

[0086] It should be noted that compressor 3 is the core component of the air conditioner, which is responsible for compressing the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure gas, and then sending it to the condenser for cooling, and then releasing heat through the evaporator to achieve a refrigeration effect. The working principle of compressor 3 is based on a thermodynamic cycle, including four processes of compression, condensation, expansion and evaporation.

[0087] In addition, please refer to the embodiment of the power supply control system of the compressor for an introduction of the air conditioner provided by the invention, and the invention will not be repeated here. The power supply control system of the compressor and the compressor 3 work together to ensure the normal operation and high efficiency of the air conditioner.

[0088] It can be seen that the air conditioner provided in this embodiment rectifies the corresponding AC power into DC power to power the inverter 2 through each charging module 1, and then uses the inverter 2 to invert the DC power into AC power to power the compressor 3. Since there is a DC voltage at the output ends of at least two of the charging modules at the same time, when one power supply in the power supply control system of the compressor is shut down or powered off, the other power supplies that are not shut down or powered off continue to supply power to the compressor 3 uninterruptedly, and the compressor 3 of the air conditioner continues to run without stopping, and the cooling capacity is uninterrupted, thereby improving the stability of the air conditioner operation.

[0089] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0090] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0091] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply control system for a compressor, characterized in that: include: At least two charging modules, the input ends of at least two charging modules are respectively connected to at least two AC power lines, the output ends are connected in parallel and the common end after parallel connection is connected to the input end of the inverter, and is used to rectify the corresponding AC power into DC power; wherein, there is a DC voltage at the output ends of at least two of the charging modules at the same time; The inverter is connected to the compressor of the air conditioner and is used to invert the direct current into alternating current to power the compressor.

2. The compressor power supply control system according to claim 1, characterized in that: Also includes: At least two anti-reverse modules are respectively arranged at the output end of each charging module in a one-to-one correspondence, and are used to prevent current backflow between the charging modules.

3. The power supply control system for the compressor according to claim 1, characterized in that: Also includes: At least two fuses are respectively arranged at the output end of each charging module, and are used to disconnect the circuit between the charging module and the inverter when the current output by the charging module is greater than a preset current threshold.

4. The power supply control system for the compressor according to claim 1, characterized in that: Also includes: A filter module, wherein a first end of the filter module is connected to a common end of at least two of the charging modules, and a second end of the filter module is connected to an input end of the frequency converter.

5. The power supply control system for the compressor according to claim 4, characterized in that: The filtering module includes at least two filtering capacitors, and the capacitance values ​​of at least two filtering capacitors are different.

6. The power supply control system for a compressor according to any one of claims 1 to 5, characterized in that: For any of the charging modules, the charging module includes: A power factor corrector, wherein the input end of the power factor corrector is connected to the corresponding alternating current, and the output end is connected to the input end of the DC / DC converter, and is used to convert the corresponding alternating current into direct current and perform power factor correction; The DC / DC converter, whose output end is connected to the input end of the frequency converter, is used to perform voltage conversion on the direct current.

7. The power supply control system for the compressor according to claim 6, characterized in that: The charging module also includes: A first EMI filter, which is arranged at the input end of the power factor corrector and is used for performing EMI filtering on the AC power corresponding to the first EMI filter; A second EMI filter is provided at the output end of the DC / DC converter and is used for performing EMI filtering on the direct current at the output end of the DC / DC converter.

8. The power supply control system for the compressor according to claim 6, characterized in that: The charging module also includes: A processor is used to send the output current of its own charging module to the processors in each of the other charging modules, obtain the output current of the charging modules sent by the processors in each of the other charging modules, determine the average current based on all the output currents, and control the power factor corrector and DC / DC converter corresponding to itself so that the output voltages of all DC / DC converters are the same and the output current of the DC / DC converter is the average current.

9. The power supply control system for a compressor according to claim 6, characterized in that: The charging module also includes: The processor is used to control the power factor corrector and DC / DC converter corresponding to itself so as to output direct current to the inverter, wherein the output voltage of each charging module is different, and the load capacity of each charging module is not less than the total load of the inverter.

10. An air conditioner, characterized in that: The invention comprises a compressor and also comprises a power supply control system of the compressor according to any one of claims 1 to 9, wherein the power supply control system of the compressor is connected to the compressor.

Images