Power supply control system of compressor and air conditioner

Abstract

The application 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 respectively connected to at least two AC power supplies, and rectify the at least two AC power supplies into DC power to supply power to the frequency converter, and then the frequency converter inverts the DC power into AC power to supply power to the compressor.Because the output ends of the at least two charging modules simultaneously exist DC voltage, when one power supply in the power supply control system of the compressor loses power, the other power supply continuously and uninterruptedly supplies power to the compressor, the compressor of the air conditioner continuously runs without stopping, the cooling capacity is uninterrupted, and the stability of the air conditioner is improved.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a power supply control system for a compressor and an air conditioner. Background Technology

[0002] With the advent of the era of intelligence and information, the development and construction of data centers are in a period of rapid growth. Users are paying more and more attention to the energy-saving effect of products, upgrading from fixed-frequency products to variable-frequency products, including compressors which are also required to use variable-frequency drives. At the same time, stringent requirements are placed on 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 supply power to the air conditioning system through a switching device. This configuration can provide higher reliability. If one power supply fails, it can be switched to the other power supply to take over, thereby avoiding the air conditioning system from stopping work due to power problems.

[0003] Currently, commonly used switching devices generally employ dual-power transfer switch switching and dual-contactor switching technologies. However, both dual-power transfer switch switching and dual-contactor switching are driven by coil excitation, and both involve a switching process from contact opening to closing. During the switching process, both dual-power transfer switch switching and dual-contactor switching have a switching time of 100ms to 500ms. During this time, the input power fails, the input terminal of the compressor's frequency converter becomes undervoltage, and the power supply is quickly cut off, causing the compressor to stop. It takes more than 60 seconds for the compressor to restart and rise to a higher frequency. During this period, cooling capacity is lost, reducing the stability of the air conditioner's operation. Summary of the Invention

[0004] The purpose of this invention is to provide a power supply control system for a compressor and an air conditioner, which can ensure that when one power supply in the compressor power supply control system fails, other power supplies continue to supply power to the compressor uninterruptedly, so that the air conditioner compressor can run continuously without stopping, thereby achieving the requirement of uninterrupted cooling.

[0005] To solve the above-mentioned technical problems, the present invention provides a power supply control system for a compressor, comprising:

[0006] At least two charging modules are provided, with their input terminals respectively connected to at least two AC power sources. Their output terminals are connected in parallel, and the common terminal of the parallel connection is connected to the input terminal of the frequency converter, for rectifying the AC power corresponding to themselves into DC power. The output terminals of at least two charging modules simultaneously have DC voltage.

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

[0008] Optional, also includes:

[0009] At least two anti-reverse modules are respectively set at the output terminal of each of the charging modules to prevent current backflow between the charging modules.

[0010] Optional, also includes:

[0011] At least two fuses are respectively installed at the output terminal of each of the charging modules to disconnect the circuit between the charging module and the frequency converter when the current output by the charging module is greater than a preset current threshold.

[0012] Optional, also includes:

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

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

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

[0016] A power factor corrector, wherein the input terminal of the power factor corrector is connected to its corresponding AC power and the output terminal is connected to the input terminal of a DC / DC converter, and is used to convert its corresponding AC power into DC power and perform power factor correction;

[0017] The output terminal of the DC / DC converter is connected to the input terminal of the frequency converter, and is used to convert the DC power into voltage.

[0018] Optionally, the charging module further includes:

[0019] The first EMI filter is located at the input of the power factor corrector and is used to perform EMI filtering on the corresponding AC power.

[0020] The second EMI filter is located at the output of the DC / DC converter and is used to perform EMI filtering on the DC power at the output of the DC / DC converter.

[0021] Optionally, the charging module further includes:

[0022] The processor is configured to send the output current of its own charging module to the processors in the other charging modules, acquire the output current of their respective charging modules sent by the processors in the other charging modules, determine the average current based on all the output currents, and control its corresponding power factor corrector and DC / DC converter so that the output voltage of all DC / DC converters is 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 controls its corresponding power factor corrector and DC / DC converter to output DC power to the frequency converter. 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 frequency converter.

[0025] To solve the above-mentioned technical problems, the present invention also provides an air conditioner, including a compressor, and further including a power supply control system for the compressor as described above, wherein the power supply control system for the compressor is connected to the compressor.

[0026] This 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. The at least two charging modules are used to rectify at least two AC power sources into DC power to power the frequency converter. Then, the frequency converter is used to invert the DC power into AC power to power the compressor. Since there is DC voltage at the output terminals of at least two charging modules at the same time, when one power source in the power supply control system of the compressor fails, the other power sources continue to supply power to the compressor uninterruptedly. The compressor of the air conditioner runs continuously without stopping, and the cooling capacity is uninterrupted, thus improving the stability of the air conditioner. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0029] Figure 2 This is a schematic diagram of the power supply control system for a specific compressor provided by the present invention. Detailed Implementation

[0030] The core of this invention is to provide a power supply control system for a compressor and an air conditioner, which can ensure that when one power supply in the compressor power supply control system fails, the other power supplies continue to supply power to the compressor uninterruptedly, so that the air conditioner compressor can run continuously without stopping, thereby achieving the requirement of uninterrupted cooling.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Currently, commonly used switching devices generally employ dual-power transfer switch switching and dual-contactor switching technologies. However, both dual-power transfer switch switching and dual-contactor switching are driven by coil excitation, and both involve a switching process from contact opening to closing. During the switching process, both dual-power transfer switch switching and dual-contactor switching have a switching time of 100ms to 500ms. During this time, the input power fails, the input terminal of the compressor's frequency converter becomes undervoltage, and the power supply is quickly cut off, causing the compressor to stop. It takes more than 60 seconds for the compressor to restart and rise to a higher frequency. During this period, cooling capacity is lost, reducing the stability of the air conditioner's operation.

[0033] To address the aforementioned technical problems, the present invention provides a power supply control system for a compressor.

[0034] Specifically, please see Figure 1 As shown, Figure 1 This is a schematic diagram of the power supply control system for a compressor provided by the present invention. Figure 1 Taking a system with at least two AC power sources, including power supply I and power supply II, as an example, there are correspondingly two charging modules.

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

[0036] At least two charging modules 1 are provided, with their input terminals respectively connected to at least two AC power sources. Their output terminals are connected in parallel, and the common terminal of the parallel connection is connected to the input terminal of the frequency converter 2, which is used to rectify their corresponding AC power into DC power. At least two charging modules 1 have DC voltage at their output terminals simultaneously.

[0037] Inverter 2 is connected to the air conditioner compressor 3 and is used to invert DC power into AC power to supply power to the compressor 3.

[0038] The power supply control system of this compressor includes at least two charging modules 1 and a frequency converter 2. AC power is input from the input terminal of the charging module 1, and after EMI (Electromagnetic Interference) filtering and PFC (Power Factor Correction) within the charging module 1, the input AC power is rectified and its power factor corrected. Then, it is output as a stable and controllable voltage and current by a DC / DC converter. 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. This allows the charging module 1 to monitor the voltage and current at the output terminals of all charging modules 1, and to issue commands to each charging module 1 via CAN communication, realizing functions such as voltage regulation, current limiting, and module on / off switching. Furthermore, to ensure the safe and reliable operation of the compressor's power supply control system, a type C circuit breaker with a rated current of 80A or higher can be used between the input terminal of each charging module 1 and its corresponding AC power supply. When power is initially supplied to compressor 3, there are two power supply methods. Correspondingly, when power supply 1 fails or drops off, there are also two ways to ensure that other power supplies that have not failed or dropped off continue to supply power to compressor 3 uninterruptedly.

[0039] In one specific implementation, the charging modules 1 do not have a master / slave relationship, allowing simultaneous output to power the compressor 3. In this mode, when the circuit breaker between the input terminals of all charging modules 1 and their respective AC power supplies is closed, each charging module 1 outputs current in a shared manner to simultaneously power the inverter 2. When one power supply fails or loses power, the charging modules 1 corresponding to the other power supplies that have not failed or lost power adjust their respective output currents to continue to output current in a shared manner to power the inverter 2.

[0040] In another specific implementation, each charging module 1 has a primary and backup relationship. One charging module 1 is the primary charging module and outputs current, while the other charging modules 1 serve as backup charging modules. The backup charging modules include a first backup charging module, a second backup charging module, and a third backup charging module, etc. In this way, the output voltages of the primary charging module, the backup charging modules, and each backup charging module differ sequentially by a preset voltage, with the primary charging module having the largest output voltage. The preset voltage can be 10V. Under normal circumstances, both the primary charging module and each backup charging module have voltage output. When the circuit breaker between the input terminal of all charging modules 1 and their corresponding AC power supply is closed, only the primary charging module has output current, while the output currents of the other backup charging modules are all 0, indicating a hot standby state. When the power supply corresponding to the primary charging module fails or loses power, the output current of the primary charging module becomes 0, and the backup charging module with the largest output voltage starts supplying power to the frequency converter 2, thus ensuring uninterrupted power supply to the frequency converter 2.

[0041] As can be seen, this embodiment provides a power supply control system for a compressor. Each charging module 1 rectifies the corresponding AC power into DC power to supply power to the inverter 2. Then, the inverter 2 inverts the DC power into AC power to supply power to the compressor 3. Since at least two of the charging modules have DC voltage at their output terminals at the same time, when one power supply in the compressor power supply control system fails or loses power, the other power supplies that have not failed or lost power continue to supply power to the compressor 3 uninterruptedly. The air conditioner compressor 3 continues to run without stopping, and the cooling capacity is uninterrupted, thus improving the stability of the air conditioner.

[0042] Based on the above embodiments:

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

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

[0045] At least two anti-reverse modules 4 are respectively set at the output terminal of each charging module 1 to prevent current backflow between charging modules 1.

[0046] In this embodiment, to prevent circulating current caused by backflow between charging modules 1 and resulting in safety issues, this application configures an anti-reverse module 4 between each charging module 1 and the inverter 2. This avoids mutual interference between charging modules 1, ensuring that even if a single charging module 1 experiences a short circuit or other fault, it will not cause abnormal operation of other charging modules 1. Furthermore, when there is a master-slave relationship among the charging modules 1, the charging module 1 with the highest output voltage is guaranteed to prioritize powering the inverter 2 without affecting other charging modules 1. It should be noted that the anti-reverse module 4 can be an anti-reverse diode.

[0047] As can be seen, in this embodiment, each charging module 1 and the inverter 2 are equipped with an anti-reverse module 4 to avoid mutual interference between the charging modules 1 and to ensure that each charging module 1 can safely and reliably supply power to the inverter 2.

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

[0049] At least two fuses 5 are respectively installed at the output terminal of each charging module 1 to disconnect the circuit between the charging module 1 and the frequency converter 2 when the current output by the charging module 1 is greater than the preset current threshold.

[0050] In this embodiment, when a short circuit occurs in charging module 1, the circuit will short-circuit, causing the compressor's power supply control system to be unable to supply power to the inverter 2 normally, resulting in the compressor 3 stopping. To avoid this situation, this embodiment adds a fuse 5 to the output terminal of each charging module 1 to prevent a short circuit in the entire compressor's power supply control system when a short circuit occurs in charging module 1. Specifically, when a short circuit occurs in one charging module 1, the fuse 5 corresponding to that charging module 1 will blow due to the short circuit, isolating the short circuit point from the inverter 2. Other charging modules 1 that have not experienced a fault can continue to supply power to the inverter 2, ensuring that the compressor 3 does not stop.

[0051] It is evident that the main function of the fuse 5 in the power supply control system of the compressor is to provide short-circuit protection, so as to ensure that when a short circuit occurs in the charging module 1, the charging module 1 is quickly disconnected, and other charging modules 1 that have not failed can continue to supply power to the inverter 2, ensuring that the compressor 3 does not stop running, thereby protecting the entire power supply control system of the compressor from damage.

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

[0053] The filter module 6 has its first end connected to the common end of at least two charging modules 1, and its second end connected to the input end of the frequency converter 2.

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

[0055] As can be seen, the filter module 6 can effectively filter out noise and interference components in the voltage input to the inverter 2, smooth the DC current, remove high-frequency noise, and make the standard negative voltage more stable, thereby improving 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, the at least two filtering capacitors having different capacitance values.

[0057] Specifically, the main function of the filter capacitor is to reduce the ripple amplitude of the DC output of the charging module 1, thereby ensuring the normal operation of the circuit. The filter module 6 includes at least two filter capacitors with different capacitance values ​​to achieve more precise frequency adjustment and optimization according to specific needs. Together, they filter out noise 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 is evident 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 circuit's anti-interference capability.

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

[0060] A power factor corrector is connected to its own AC power input and its output to the input of a DC / DC converter. It is used to convert its own AC power into DC power and perform power factor correction.

[0061] The DC / DC converter, whose output is connected to the input of frequency converter 2, is used to convert DC power to voltage.

[0062] In this embodiment, to reduce reactive power and improve the system's power factor, thereby reducing energy 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 indicator that measures the efficiency of converting electrical energy into useful output in the compressor's power supply control system. Its value ranges from 0 to 1, ideally close to 1. When the power factor is low, a large amount of electrical energy is wasted, leading to energy waste and equipment overheating. The power factor corrector improves the power factor by increasing capacitance or inductance, making the current and voltage waveforms more consistent, thereby reducing reactive power components. In addition, PFC circuits include passive PFC circuits and active PFC circuits. Passive PFC circuits are generally suitable for small power supplies, using low-pass filters to suppress harmonic currents, allowing nonlinear devices to be used as linear loads. Active PFC circuits, on the other hand, are suitable for larger power supplies. Active PFC circuits are composed of components such as high-frequency inductors, switching transistors, and capacitors. They can convert 110V or 220V AC mains power into a DC high voltage of about 380V. Active PFC circuits are also characterized by their small size and light weight.

[0063] Furthermore, after the AC power is converted to DC power and power factor corrected by the power factor corrector, the DC / DC converter then performs voltage conversion on the power factor corrected DC power. Specifically, when one power supply line fails or loses power, the output current of the charging module 1 connected to that line is 0. The charging modules 1 connected to other power supplies receive the output current sent by the charging module 1 connected to that line. The charging module 1 controls the DC / DC converter to chop the DC power into a square wave (pulse wave) using 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] As can be seen, the power factor corrector converts AC power to DC power through rectification and performs power factor correction to reduce reactive power components, making the current and voltage waveforms more consistent and improving energy utilization. Then, the DC / DC converter converts the power factor corrected DC power into the DC power required by the charging module 1 itself, ensuring the stability of the DC input of the frequency converter 2.

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

[0066] A transformer is connected to the output of a DC / DC converter to convert the DC output voltage.

[0067] To further increase the voltage range of DC power, a transformer can also be installed in the charging module 1 to further convert the DC power output from the DC / DC converter to meet the needs of loads with different capacities.

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

[0069] The first EMI filter is set at the input of the power factor corrector and is used to perform EMI filtering on the corresponding AC power.

[0070] The second EMI filter is located at the output of the DC / DC converter and is used to perform EMI filtering on the DC power at the output of the DC / DC converter.

[0071] Because power supplies carry high-frequency noise and electromagnetic interference during transmission, which can affect the normal operation of electronic devices, the charging module 1 used in this embodiment further includes a first EMI filter and a second EMI filter to effectively suppress this high-frequency noise, protect the equipment from interference, and ensure stable operation. An EMI filter is a filter circuit composed of capacitors, inductors, and resistors. A key characteristic of EMI filters is that the greater the impedance matching 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. EMI filters can effectively filter out specific frequencies in the power supply, or frequencies other than those frequencies, to obtain a power supply signal of a specific frequency or to eliminate the power supply signal of a specific frequency.

[0072] As can be seen, the charging module 1 used in this embodiment also includes a first EMI filter and a second EMI filter, which can effectively filter out high-frequency noise and electromagnetic interference carried by the power supply during transmission, 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] The 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 their respective charging modules 1 sent by the processors in other charging modules 1, determine the average current based on all the output currents, and control its corresponding power factor corrector and DC / DC converter so that the output voltage of all DC / DC converters is the same and the output current of the DC / DC converters is the average current.

[0075] If there is no master / slave relationship between the charging modules 1, each charging module 1 is allowed to simultaneously output power to the compressor 3. In this mode, when the circuit breaker between the input terminal of all charging modules 1 and their respective AC power supply is 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. Based on the output current of all charging modules 1, the average current is determined, and the output voltage of each charging module 1 is adjusted to be the same, so that the output current of each charging module 1 is the average current.

[0076] It should be noted that the arithmetic average of all output currents can be used as the average current. PID control (proportional-integral-derivative control) can be used to adjust the output current of each charging module 1 to approach the average current, thereby achieving current sharing among all charging modules 1 to power the inverter 2, thus improving system stability and reliability. PID control includes three parts: proportional, integral, and derivative, corresponding to the adjustment of current error, cumulative error, and rate of change error, respectively. This adjusts the output control quantity, making the control process approach the desired value and maintain stability. The importance of PID control parameter adjustment lies in improving the response speed and stability of the compressor's power supply control system and reducing steady-state error.

[0077] Furthermore, when one power supply line fails or loses power, the output current of the charging module 1 containing that line is 0. The processors in the charging modules 1 containing other power supplies receive the output current of the charging module 1 containing that line from the processor in the charging module 1 containing that line. At this time, the arithmetic average of the output current of the charging modules 1 containing the power supplies that have not failed or lost power can be recalculated. The arithmetic average of the output current of the charging modules 1 containing the power supplies that have not failed or lost power is taken as the new average current. The output current of the charging modules 1 containing the power supplies that have not failed or lost power is adjusted to be close to the new average current through PID control, so that the other power supplies that have not failed or lost power can continue to supply power to the inverter 2 uninterruptedly.

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

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

[0080] The processor controls its corresponding power factor corrector and DC / DC converter to output DC power to the inverter 2. Each charging module 1 has a different output voltage, 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 primary / backup relationship, one charging module 1 is the primary charging module and outputs current, while the other charging modules 1 serve as backup charging modules. These backup charging modules include a first backup charging module, a second backup charging module, and a third backup charging module, etc. In this configuration, the output voltages of the primary charging module and each backup charging module differ sequentially by a preset voltage, with the primary charging module having the highest output voltage. The preset voltage can be 10V. Under normal circumstances, both the primary and backup charging modules have voltage output. When the circuit breaker between the input terminals of all charging modules 1 and their corresponding AC power supplies is closed, only the primary charging module outputs current; the output current of the other backup charging modules is zero, indicating a hot standby state.

[0082] When the main charging module experiences a power outage or power failure, its output current becomes zero. The processors in each backup charging module receive the output current from the main charging module, and the processor in the backup charging module with the highest output voltage begins supplying power to inverter 2. This ensures that the other power sources, which are not experiencing power outages or power failures, continue to supply power to inverter 2 uninterruptedly. To ensure that inverter 2 operates normally when each charging module 1 independently supplies power, the load capacity of each charging module must be no less than the total load of inverter 2.

[0083] As can be seen, if each charging module 1 has a master-slave relationship, one charging module 1 is the master charging module and outputs current, while the other charging modules 1 are backup charging modules. When the power supply corresponding to the master charging module fails or loses power, the backup charging module with the largest output voltage starts to supply power to the inverter 2, so as to realize that the air conditioner compressor 3 runs continuously without stopping and the cooling is uninterrupted.

[0084] In practical applications, if each charging module 1 is connected to a mains power supply with the same cost, then there can be no primary / backup relationship between the charging modules 1, and each charging module 1 can simultaneously supply power to the compressor 3. If the cost of the AC power connected to each charging module 1 is different, then there can be a primary / backup relationship between the charging modules 1, with the charging module 1 with the lower cost serving as the primary charging module and the others serving as backup charging modules, thereby reducing costs and improving economic efficiency.

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

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

[0087] Furthermore, for an introduction to an air conditioner provided by the invention, please refer to the embodiment of the compressor power supply control system described above; the invention will not be repeated here. The combined action of the compressor power supply control system and the compressor 3 ensures the normal operation and high efficiency of the air conditioner.

[0088] As can be seen, the air conditioner provided in this embodiment rectifies the corresponding AC power into DC power through each charging module 1 to power the inverter 2, and then uses the inverter 2 to invert the DC power into AC power to power the compressor 3. Since there is DC voltage at the output terminals of at least two of the charging modules at the same time, when one power supply in the compressor power supply control system fails or loses power, the other power supplies that have not failed or lost power continue to supply power to the compressor 3 uninterruptedly. The air conditioner compressor 3 runs continuously without stopping, and the cooling capacity is uninterrupted, which improves the stability of the air conditioner operation.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0090] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded 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 are provided, with their input terminals respectively connected to at least two AC power sources. Their output terminals are connected in parallel, and the common terminal of the parallel connection is connected to the input terminal of the frequency converter, for rectifying the AC power corresponding to themselves into DC power. The output terminals of at least two charging modules simultaneously have DC voltage. The inverter is connected to the air conditioner's compressor and is used to convert the direct current into alternating current to power the compressor. For any one of the charging modules, the charging module includes: A power factor corrector, wherein the input terminal of the power factor corrector is connected to its corresponding AC power and the output terminal is connected to the input terminal of a DC / DC converter, and is used to convert its corresponding AC power into DC power and perform power factor correction; The DC / DC converter has its output terminal connected to the input terminal of the frequency converter, and is used to convert the DC power to voltage. The charging module also includes: Processor, used for: The processor sends the output current of its own charging module to the processors in the other charging modules, obtains the output current of the charging modules sent by the processors in the other charging modules, determines the average current based on all the output currents, and controls its corresponding power factor corrector and DC / DC converter so that the output voltage of all DC / DC converters is the same and the output current of the DC / DC converter is the average current. Alternatively, the corresponding power factor corrector and DC / DC converter can be controlled to output DC power to the frequency converter, 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 frequency converter.

2. The power supply control system for the compressor as described in claim 1, characterized in that, Also includes: At least two anti-reverse modules are respectively set at the output terminal of each of the charging modules to prevent current backflow between the charging modules.

3. The power supply control system for the compressor as described in claim 1, characterized in that, Also includes: At least two fuses are respectively installed at the output terminal of each of the charging modules to disconnect the circuit between the charging module and the frequency converter when the current output by the charging module is greater than a preset current threshold.

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

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

6. The power supply control system for the compressor as described in claim 1, characterized in that, The charging module also includes: The first EMI filter is located at the input of the power factor corrector and is used to perform EMI filtering on the corresponding AC power. The second EMI filter is located at the output of the DC / DC converter and is used to perform EMI filtering on the DC power at the output of the DC / DC converter.

7. An air conditioner, characterized in that, It includes a compressor, and also includes a power supply control system for the compressor as described in any one of claims 1 to 6, wherein the power supply control system for the compressor is connected to the compressor.

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