Rectifier module, power conversion module and power control system

Abstract

The invention relates to the technical field of air conditioners, and provides a rectification module, a power conversion module and a power control system.The rectification module comprises a rectification packaging shell and a rectification circuit, and the rectification packaging shell is provided with pins; the rectifying circuit is packaged in the rectifying packaging shell and electrically connected with the pins, the rectifying circuit comprises at least one rectifying bridge arm, and the rectifying circuit is used for converting input alternating current into direct current. According to the rectification module provided by the invention, the rectification circuit is independently packaged in the rectification packaging shell, and the pins on the rectification packaging shell are utilized to realize electrical connection with the external circuit, so that physical isolation of the rectification circuit is realized, and the problem of interference coupling in traditional integrated packaging is effectively avoided; therefore, the influence of high-frequency noise on the internal rectifier bridge arm is remarkably reduced, the reliability of the rectification process is guaranteed, and the stability and reliability of long-term operation of the system are improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a rectifier module, a power conversion module, and a power control system. Background Technology

[0002] The core of a variable frequency air conditioning system lies in the driving and control of its compressor. This core function is mainly realized by the power conversion module. Its conversion efficiency, switching characteristics, and anti-interference capabilities directly determine the overall energy efficiency, operating noise quality, and long-term reliability of the entire system, and are key indicators of the competitiveness of modern variable frequency air conditioning technology. Currently, this power module is evolving towards higher integration and higher power density, aiming to achieve more powerful power handling and better cost control within a limited space.

[0003] In existing technologies, the use of power conversion modules can adversely affect the stability of air conditioning systems, leading to a decrease in their performance. Summary of the Invention

[0004] This invention provides a rectifier module, a power conversion module, and a power control system to address the shortcomings of existing power conversion modules that can lead to decreased system stability. By independently encapsulating the rectifier circuit within a rectifier housing, physical isolation is achieved, thereby improving the long-term stability and reliability of the system.

[0005] This invention provides a rectifier module, comprising: A rectifier package housing, wherein the rectifier package housing is provided with pins; A rectifier circuit, which is encapsulated within a rectifier package and electrically connected to the pins, includes at least one rectifier bridge arm and is used to convert input AC power into DC power.

[0006] According to a rectifier module provided by the present invention, a mounting portion is provided on the side of the rectifier package housing.

[0007] According to a rectifier module provided by the present invention, the surface of the rectifier package housing where the pins are disposed is provided with a positioning portion.

[0008] The present invention also provides a power conversion module, including an inverter module and a rectifier module as described in any one of the above, wherein the inverter module includes an inverter package housing and an inverter circuit packaged within the inverter package housing.

[0009] The present invention also provides a power control system, comprising: The rectifier module described in any of the above has its input terminal connected to a three-phase power supply. processor; A three-phase imbalance detection circuit is connected between the processor and the three-phase power supply; The three-phase imbalance detection circuit is configured to step down the three-phase voltage output by the three-phase power supply and generate a corresponding low-voltage detection signal to be transmitted to the processor. The processor is configured to determine whether the three-phase voltage output by the three-phase power supply is balanced based on the low-voltage detection signal, and to generate a fault protection control signal when the three-phase voltage is determined to be unbalanced.

[0010] According to a power control system provided by the present invention, the three-phase imbalance detection circuit includes three voltage detection circuits, which are respectively connected to the three-phase lines of the three-phase power supply. Each voltage detection circuit includes: A voltage divider circuit is used to reduce the voltage of each phase output by the three-phase power supply to generate a corresponding low-voltage detection signal. The input terminal of the voltage divider circuit is connected to the phase line corresponding to the three-phase power supply. A signal filtering circuit is provided, the input of which is connected to the output of the voltage divider circuit. The signal filtering circuit is used to filter the low-voltage detection signal, and the output of the signal filtering circuit is connected to the processor.

[0011] According to a power control system provided by the present invention, the voltage detection circuit further includes: A protection circuit is connected to the output terminal of the signal filtering circuit. The protection circuit is used to limit the voltage amplitude of the low-voltage detection signal filtered by the signal filtering circuit to a preset safe voltage range.

[0012] According to a power control system provided by the present invention, the voltage divider circuit includes a plurality of voltage divider resistors connected in series.

[0013] According to a power control system provided by the present invention, the signal filtering circuit includes an RC filter circuit.

[0014] According to a power control system provided by the present invention, a power supply filter circuit is further included, which is connected between the output terminal of the three-phase power supply and the input terminal of the rectifier circuit.

[0015] According to a power control system provided by the present invention, the power supply filtering circuit includes a common-mode inductor, the common-mode inductor includes three coils, one end of each of the three coils is connected to the three phase lines of the three-phase power supply, the other end of each of the three coils is connected to a rectifier circuit, and a first discharge tube is connected in parallel to the coils.

[0016] The rectifier module provided by this invention achieves physical isolation of the rectifier circuit by independently encapsulating the rectifier circuit within a rectifier package housing and using the pins on the rectifier package housing to realize electrical connection with external circuits. This effectively avoids interference coupling problems in traditional integrated packaging, thereby significantly reducing the impact of high-frequency noise on the internal rectifier bridge arm, preventing component malfunction or performance degradation caused by noise interference, ensuring the reliability of the rectification process, and thus improving the long-term stability and reliability of the system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the rectifier module provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the rectifier module provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the topology of the rectifier circuit provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the topology of the power control system provided by the present invention.

[0022] Figure 5 This is a schematic diagram of the power supply filtering circuit provided by the present invention.

[0023] Figure 6 This is a schematic diagram of the topology of the three-phase imbalance detection circuit provided by the present invention.

[0024] Figure 7 This is a schematic diagram of the topology of the compressor current sampling and protection circuit provided by the present invention.

[0025] Figure label: 10. Rectifier module; 11. Rectifier package housing; 111. Mounting part; 112. Positioning part; 12. Rectifier circuit; 121. Rectifier bridge arm; 13. Pin; 20. Three-phase imbalance detection circuit; 21. Voltage divider circuit; 22. Signal filtering circuit; 23. Protection circuit; 30. Power supply filtering circuit; 40. Compressor current sampling and protection circuit; 41. Current sampling resistor; 42. Proportional and addition operation circuit; 43. Bias circuit; 44. Comparator circuit; 45. Voltage divider and filter circuit; 46. Integrator circuit; 47. Inverting circuit. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0029] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] An embodiment of the first aspect of the present invention provides a rectifier module, such as... Figures 1 to 3 As shown, the rectifier module 10 includes a rectifier package housing 11 and a rectifier circuit 12 encapsulated within the rectifier package housing 11.

[0032] The rectifier package 11 is provided with pins 13, and the rectifier circuit 12 is electrically connected to the pins 13. The rectifier circuit 12 includes at least one rectifier bridge arm 121 and is used to convert the input AC power into DC power.

[0033] It is understood that the rectifier module 10 mainly consists of a rectifier package housing 11 and an integrated rectifier circuit 12 inside it. The rectifier package housing 11 is provided with multiple pins 13 for external electrical connection. The rectifier circuit 12 encapsulated inside the rectifier package housing 11 is electrically connected to the pins 13 through bonding or internal wiring. The pins 13 are used to connect to an external AC power supply and output the converted DC power.

[0034] The rectifier circuit 12 is composed of at least one rectifier bridge arm 121, for example, six diode chips integrated in a full-bridge configuration. The function of the rectifier circuit 12 is to receive the AC power introduced through pin 13 and convert it into pulsating DC power through the switching rectification action of the rectifier bridge arm 121, and finally deliver it to the subsequent circuit via pin 13.

[0035] It should be noted that the rectifier module 10 of the present invention independently encapsulates the rectifier circuit 12 within a rectifier package housing 11, and achieves electrical connection with external circuits through pins 13 on the rectifier package housing 11. This independent packaging structure effectively blocks the propagation path of electromagnetic interference from the inverter side or other high-frequency switching circuits, effectively avoiding the strong electromagnetic interference problem caused by the dense layout of high-frequency switching devices when the rectifier and inverter share a package in the traditional way. This significantly reduces the impact of high-frequency noise on the internal rectifier bridge arm 121, preventing component malfunction, signal distortion, or performance degradation caused by noise interference. At the same time, the independent packaging design improves the insulation, anti-interference capability, and heat dissipation performance of the rectifier module 10, further ensuring the stability and reliability of the rectification process, thereby improving the long-term stability and reliability of the entire system.

[0036] The rectifier module 10 provided in this embodiment of the invention achieves physical isolation of the rectifier circuit 12 by independently encapsulating the rectifier circuit 12 in the rectifier package housing 11 and using the pins 13 on the rectifier package housing 11 to realize electrical connection with the external circuit. This effectively avoids the interference coupling problem in traditional integrated packaging, thereby significantly reducing the impact of high-frequency noise on the internal rectifier bridge arm 121, preventing component malfunction or performance degradation caused by noise interference, ensuring the reliability of the rectification process, and thus improving the stability and reliability of the system in long-term operation.

[0037] It should be noted that in existing air conditioning systems, the rectifier is integrated with the inverter in a single package. Due to the limited space within the package, the rectifier chip area is small, resulting in low heat dissipation efficiency. Under high-temperature conditions, the chip junction temperature is prone to rise, affecting energy efficiency and increasing the risk of thermal failure. The small size of the rectifier chip also makes it insufficient to withstand multiple surge current impacts caused by compressor start-up and shutdown or grid fluctuations, easily leading to device damage. Simultaneously, the small size of the rectifier chip limits power density, making it difficult to meet the current demands of high-power or extreme operating conditions, thus hindering the improvement of air conditioning performance. Furthermore, the high-frequency switching between the rectifier and inverter circuits within the same package causes severe electromagnetic interference problems, leading to decreased system stability and requiring additional complex filtering circuits to meet EMC requirements.

[0038] In contrast, this invention employs an independent packaging scheme for the rectifier chip (rectifier circuit). By increasing the rectifier chip area and packaging it independently, it effectively improves the heat dissipation area and heat conduction efficiency, reduces the operating junction temperature, and extends the lifespan of the power module. The larger rectifier chip size of this invention also enhances the ability to withstand surge currents, enabling it to withstand higher energy and more frequent current surges, ensuring stable operation of the air conditioner. Simultaneously, current handling capacity and power density are improved, meeting the application requirements of high-power air conditioners. Most importantly, the independent packaging of the rectifier in this invention achieves physical separation between the rectifier module 10 and the inverter section, avoiding mutual coupling of high-frequency noise, suppressing electromagnetic interference at the source, significantly improving the electromagnetic compatibility (EMC) performance of the system, and simplifying the design of external filter circuits, thereby improving the overall reliability, stability, and energy efficiency of the air conditioning system.

[0039] In one embodiment of the present invention, such as Figure 2 As shown, a mounting portion 111 is provided on the side of the rectifier package housing 11.

[0040] Understandably, a mounting portion 111 is provided on the side of the rectifier package housing 11. This mounting portion 111 is used to fix the rectifier module 10 to an external structure such as a device bracket or circuit board. By providing the mounting portion 111 on the side of the rectifier package housing 11, the ease of installation of the rectifier module 10 is improved, thereby enhancing the adaptability and maintainability of the rectifier module 10 in different application environments, and further ensuring the stability and safety of the system's long-term operation.

[0041] For example, the mounting part 111 can be configured as a connecting plate extending horizontally outward from the side of the rectifier package housing 11. The connecting plate is provided with mounting holes. By passing fasteners such as screws, rivets or bolts through the mounting holes, the rectifier module 10 can be fixed to the external structure, which effectively enhances the mechanical stability of the module installation and facilitates quick assembly and disassembly.

[0042] In one embodiment of the present invention, such as Figure 2 As shown, the rectifier package housing 11 has a positioning part 112 on the surface of the pin 13.

[0043] Understandably, the rectifier package housing 11 also has a positioning part 112 on the surface where the pins 13 are located. The positioning part 112 is used to provide precise position guidance and mechanical alignment when the rectifier module 10 is installed or docked with an external circuit board. By setting the positioning part 112, it is possible to ensure that the pins 13 are accurately aligned with the circuit board pads or connector slots during assembly, effectively avoiding problems such as misalignment, insertion damage or poor contact caused by assembly deviations, and improving the reliability of the connection and production yield.

[0044] In one embodiment of the present invention, such as Figure 3 and Figure 4As shown, the input terminal of the rectifier circuit 12 is connected to a three-phase power supply, and the rectifier circuit 12 adopts a three-phase bridge rectifier structure.

[0045] Specifically, the rectifier circuit 12 includes three rectifier bridge arms 121, each including two rectifier diodes, denoted as rectifier diode A and rectifier diode B. For each rectifier bridge arm, the anode of rectifier diode A is connected to the cathode of rectifier diode B, forming the AC input terminal of that bridge arm. The input terminals of the three rectifier bridge arms are respectively connected to the R-phase, S-phase, and T-phase of the three-phase power supply, i.e., the input terminals of the three rectifier bridge arms are the rectified input R-phase (R1), rectified input S-phase (S1), and rectified input T-phase (T1). Simultaneously, the cathodes of all rectifier diodes A in the three rectifier bridge arms are interconnected, forming the positive output terminal (P) of the rectifier circuit, while the anodes of all rectifier diodes B are connected together, forming the negative output terminal (N) of the rectifier circuit. Through the rectifier circuit, the three-phase AC power is rectified in each cycle by the diodes of different rectifier bridge arms in turn, achieving full-wave rectification and efficiently converting the input three-phase AC power into pulsating DC power, which is then output to the subsequent DC bus or load circuit.

[0046] In one embodiment of the invention, the rectifier module adopts an EASY 1B package, which is a standardized, modular power device package structure with a compact size and optimized thermo-electro-mechanical integration design.

[0047] Specifically, the EASY 1B package employs a structure combining an insulating substrate and a high thermal conductivity material, directly mounting the rectifier chip onto a ceramic copper-clad laminate (DBC) and connecting it to the internal circuitry via press-fitting or soldering, achieving efficient heat dissipation and reliable electrical conduction. Its top features standardized pins, while the bottom is a flat metal base plate, allowing direct mounting to heat sinks. Low thermal resistance heat conduction paths are achieved using screws or thermal grease. The EASY 1B package not only improves the rectifier module's heat dissipation performance and electrical stability but also enhances its interchangeability and compatibility with different air conditioning systems due to its standardized size and interface. This facilitates automated assembly and mass production, significantly shortening product development and maintenance cycles. It's important to note that implementing a unified mechanical shape, pin layout, and mounting interface on the rectifier package housing ensures module versatility and adaptability, thereby shortening the product development cycle.

[0048] In one embodiment of the present invention, the rectifier package housing 11 is provided with a potting hole.

[0049] Understandably, after the rectifier module 10 completes the assembly of its internal rectifier chip, substrate, and leads, liquid potting compound is injected into the rectifier package housing 11 through the potting holes. This fully fills the gaps between the rectifier chip, circuit components, and the housing wall, enhancing the thermal conductivity of the rectifier module 10 and allowing the heat generated by the rectifier chip to be transferred more efficiently to the rectifier and external heat sink. Simultaneously, after the potting compound cures, it buffers mechanical vibration and thermal stress, protecting the fragile internal semiconductor devices and solder joints, and improving the mechanical strength and long-term reliability of the rectifier module 10. It should be noted that after potting, the potting holes are sealed with sealing plugs or a sealing process to ensure the overall airtightness and environmental resistance of the rectifier module 10.

[0050] A second aspect of the present invention provides a power conversion module, including an inverter module and a rectifier module 10 provided in any of the above embodiments. The inverter module includes an inverter package housing and an inverter circuit packaged within the inverter package housing.

[0051] It is understood that the power conversion module includes an inverter module and a rectifier module 10. The rectifier module 10 adopts an independent package structure, including a rectifier package housing 11 and a rectifier circuit 12 encapsulated therein. It achieves electrical connection with external circuits through pins 13 and has good heat dissipation performance, surge resistance and electromagnetic compatibility. The inverter module includes an independent inverter package housing and an inverter circuit encapsulated therein, which is used to convert the DC power output by the rectifier module 10 into AC power with adjustable frequency and voltage to drive motors or other AC loads.

[0052] It should be noted that the rectifier module 10 and the inverter module are packaged independently, achieving physical separation and avoiding the mutual coupling of high-frequency switching noise in traditional integrated packaging. This effectively reduces electromagnetic interference and improves the overall stability and reliability of the system. The power conversion module in this embodiment, through modular design, has excellent heat dissipation performance, surge resistance, and electromagnetic compatibility, making it suitable for power electronic equipment such as air conditioners and frequency converters that have high requirements for energy efficiency, reliability, and long-term operating performance.

[0053] A third aspect of the present invention provides a power control system, which includes the rectifier module 10 provided in any of the above embodiments.

[0054] It is understood that the power control system includes the rectifier module 10 described in any of the foregoing embodiments. The rectifier module 10 adopts an independent packaging design, which not only improves heat dissipation efficiency and surge current tolerance, but also effectively reduces electromagnetic interference through physical isolation and enhances the electromagnetic compatibility of the system.

[0055] It should be noted that in other embodiments, the power control system may also include the power conversion module provided in any of the above embodiments.

[0056] In one embodiment of the present invention, such as Figure 4 As shown, the power control system includes a rectifier module 10, a three-phase imbalance detection circuit 20, and a processor. The rectifier module 10 includes a rectifier circuit 12, the input of which is connected to the three-phase power supply. The three-phase imbalance detection circuit 20 is connected between the processor and the three-phase power supply.

[0057] The three-phase unbalance detection circuit 20 is configured to step down the three-phase voltage output from the three-phase power supply and generate a corresponding low-voltage detection signal to be transmitted to the processor. The processor is configured to determine whether the three-phase voltage output from the three-phase power supply is balanced based on the low-voltage detection signal, and generate a fault protection control signal when the three-phase voltage is determined to be unbalanced.

[0058] Understandably, the input terminal of the rectifier module 10 is connected to the three-phase power supply (R, S, T phases) to convert the input three-phase AC power into DC power, providing a stable DC bus voltage for the system. The three-phase unbalance detection circuit 20 is connected between the three-phase power supply and the processor. Its function is to step down the high-voltage signal output by the three-phase power supply, generating a low-voltage detection signal proportional to the original voltage through isolation step-down methods such as resistor voltage divider or miniature voltage transformer, and transmitting this low-voltage detection signal to the processor. The processor receives and analyzes these low-voltage detection signals, calculates the effective value and phase relationship of the three-phase voltage in real time, and determines whether there is a voltage imbalance (such as a phase voltage being significantly higher or lower). When a three-phase voltage imbalance is detected, the processor immediately generates a fault protection control signal, which can trigger the shutdown protection of the rectifier module or subsequent inverter circuit, issue an alarm, or activate a compensation mechanism, thereby preventing overheating, efficiency degradation, or component damage caused by long-term operation under unbalanced conditions, thus significantly improving the reliability and safety of system operation.

[0059] In one embodiment of the present invention, the three-phase imbalance detection circuit 20 includes three voltage detection circuits, which are respectively connected to the three phase lines of the three-phase power supply.

[0060] Understandably, the three-phase unbalance detection circuit 20 includes three independent voltage detection circuits, which are respectively connected to the R-phase, S-phase and T-phase lines of the three-phase power supply, for real-time monitoring of the voltage status of each phase.

[0061] Specifically, such as Figure 4 and Figure 6As shown, each voltage detection circuit includes a voltage divider circuit 21 and a signal filtering circuit 22. The voltage divider circuit 21 linearly reduces the high-amplitude voltage output from the three-phase power supply through a resistor divider network or a similar structure, converting it into a low-voltage detection signal suitable for processor sampling. This low-voltage signal is then input to the signal filtering circuit 22, which is used to filter out high-frequency noise in the power grid. The filtered and stable low-voltage detection signal is finally output to the analog input port of the processor for analog-to-digital conversion and voltage imbalance judgment.

[0062] The stable low-voltage detection signals (three-phase low-voltage detection signals) output by the three voltage detection circuits are synchronously sent to multiple ADC (analog-to-digital converter) input channels of the processor. The processor periodically acquires the three-phase low-voltage detection signals through a sampling mechanism and, combined with digital signal processing algorithms (such as root mean square calculation, zero-crossing detection, or FFT spectrum analysis), calculates key parameters such as the effective value of each phase voltage, phase difference, and grid frequency in real time. When the voltage deviation between any two phase low-voltage detection signals exceeds a preset unbalance threshold (e.g., 10%), a phase low-voltage detection signal abnormally returns to zero (phase loss fault), or the grid frequency deviates from the power frequency range (e.g., 50±2Hz), the processor determines that there is a three-phase voltage imbalance and generates a fault protection control signal to quickly activate the fault protection mechanism.

[0063] It should be noted that activating the fault protection mechanism can dynamically adjust the PWM control signal on the inverter side to limit the output power, or control the drive circuit of the rectifier module to cut off the DC output, preventing abnormal voltage conditions from causing damage to key components such as downstream inverters, motors, or capacitors due to overcurrent, overheating, or increased vibration. This significantly enhances the system's adaptability to complex power grid environments while ensuring normal and efficient rectification operation, effectively improving the reliability, safety, and overall power quality of the power conversion process.

[0064] Optionally, the voltage divider circuit includes multiple voltage divider resistors connected in series. By using the principle of resistor voltage division, the high voltage on each phase line of the three-phase power supply is reduced by a fixed ratio to generate a low-voltage detection signal suitable for subsequent processing, ensuring that the signal amplitude matches the input range of the processor.

[0065] In this embodiment, the voltage divider circuit includes five voltage divider resistors connected in series. One end of this resistor series is connected to the corresponding phase line of the three-phase power supply (such as phase R, S, or T), and the other end is grounded, forming a voltage divider node. It should be noted that... Figure 6 In the diagram, R17~R21 represent the five voltage divider resistors of a voltage divider circuit, R23~R27 represent the five voltage divider resistors of a voltage divider circuit, and R29~R33 represent the five voltage divider resistors of a voltage divider circuit. Therefore, R17~R21, R23~R27, and R29~R33 serve as the voltage divider resistors of three voltage divider circuits, respectively.

[0066] Optionally, the signal filtering circuit can be an RC filter circuit.

[0067] Specifically, the signal filtering circuit adopts an RC low-pass filter structure, with its input terminal connected to the output terminal of the voltage divider circuit. This is used to filter out high-frequency interference, switching noise, and voltage spikes superimposed on the voltage-divided signal, thereby improving signal stability and sampling accuracy.

[0068] In this embodiment, the signal filtering circuit includes a signal filtering resistor and a signal filtering capacitor. One end of the signal filtering resistor is connected to the output of the voltage divider circuit to receive the low-voltage detection signal after voltage division. One end of the signal filtering capacitor is grounded, and the other end of the signal filtering capacitor is connected to the other end of the signal filtering resistor, and both are connected to the ADC input pin of the processor. This effectively filters out high-frequency noise and interference components in the signal, making the voltage signal input to the processor smoother and more stable, improving the accuracy of voltage sampling and the system's anti-interference capability. It should be noted that... Figure 6 In the diagram, C16, C17, and C18 are signal filtering capacitors, and R16, R22, and R28 are signal filtering resistors. C16 and R16 form a signal filtering circuit, C17 and R22 form a signal filtering circuit, and C18 and R28 form a signal filtering circuit. Figure 6 In the diagram, A1, A2, and A3 represent the three input pins of the processor.

[0069] Furthermore, each voltage detection circuit includes a protection circuit 23, which is connected to the output of the signal filtering circuit 22. The protection circuit 23 is used to limit the voltage amplitude of the low-voltage detection signal filtered by the signal filtering circuit 22 to a preset safe voltage range.

[0070] Understandably, each voltage detection circuit also integrates a protection circuit. The protection circuit is connected between the output of the signal filtering circuit and the ADC input of the processor. It is usually composed of clamping diodes (such as TVS diodes) or current-limiting resistors. Its function is to limit the voltage amplitude of the filtered low-voltage detection signal to the preset safe voltage range allowed by the processor (such as 0~3.3V or 0~5V), to prevent overvoltage damage to the processor pins caused by external surges, static electricity or circuit abnormalities, further improve the reliability of the voltage detection signal, and enhance the system's anti-interference capability and long-term operational safety in harsh electromagnetic environments, providing a solid guarantee for accurate judgment of three-phase imbalance and fault protection.

[0071] In this embodiment, the voltage detection circuit includes a clamping diode, which consists of two diodes connected in series. The two ends of the clamping diode are connected to a +5V power supply and ground, respectively, and the middle connection point is connected to the signal path between the output of the signal filtering circuit and the input of the processor's ADC. When the filtered low-voltage detection signal exceeds the normal range due to abnormal conditions (such as being higher than +5V or lower than 0V), the clamping diode will quickly conduct, limiting the signal voltage to a safe range of +5V to 0V. This prevents overvoltage or negative voltage from damaging the processor's input pins, effectively achieving overvoltage protection for the ADC interface and improving the system's safety and reliability under voltage fluctuations or fault conditions.

[0072] In one embodiment of the present invention, such as Figure 4 and Figure 5 As shown, the power control system also includes a power supply filter circuit 30, which is connected between the output terminal of the three-phase power supply and the input terminal of the rectifier circuit 12. The power supply filter circuit 30 is used to perform pre-filtering on the three-phase AC power. Its main function is to suppress high-frequency conducted interference, voltage spikes and electromagnetic noise from the grid side, and at the same time reduce the reverse injection of harmonic current generated during the operation of the rectifier module 10 into the grid, thereby improving the electromagnetic compatibility (EMC) of the system.

[0073] In this embodiment, the three-phase AC power output from the three-phase power supply undergoes noise suppression and electromagnetic interference filtering through the power supply filter circuit 30. The purified AC power is then input to the rectifier module 10, where it is converted into stable DC power by the internal rectifier circuit 12 before being output for use by subsequent circuits. Simultaneously, the three-phase AC power output from the power supply filter circuit 30 is also sent to the three-phase imbalance detection circuit 20 and transmitted to the processor.

[0074] In one embodiment of the present invention, the power supply filter circuit 30 includes a common-mode inductor and a first discharge tube. The common-mode inductor includes three coils, one end of each coil is connected to one of the three phase lines of the three-phase power supply, and the other end of each coil is connected to a rectifier circuit. The first discharge tube is connected in parallel to the coils.

[0075] For example, the power supply filter circuit 30 may include a common mode inductor, which includes three coils. One end of each coil is connected to one of the three phase lines of the three-phase power supply, and the other end of each coil is connected to one of the three input terminals (R1, S1, and T1) of the rectifier circuit 12. A first discharge tube is connected in parallel to the coils.

[0076] In this embodiment, the power filter circuit 30 includes two common-mode inductors. These two common-mode inductors are connected in series between the corresponding phase lines of the three-phase power supply and the input terminal of the rectifier circuit 12. A first discharge tube is connected in parallel to the two coils of the two series-connected common-mode inductors on the same phase line to quickly conduct in the event of a voltage surge, directly guiding the excessively high voltage to ground. This protects the subsequent rectifier circuit 12 from high-voltage impacts, ensuring a stable power input to the rectifier module 10 even under harsh power grid conditions, thus enhancing the system's reliability and stability. It should be noted that... Figure 5 In the diagram, L1, L2, and L3 represent the three coils of one common-mode inductor, L4, L5, and L6 represent the three coils of another common-mode inductor, and DSA5, DSA6, and DSA7 represent the first discharge tube.

[0077] It should be noted that in other embodiments, each common-mode inductor contains three coils, and each coil is connected in parallel with a first discharge tube, so the two common-mode inductors are connected to a total of six first discharge tubes.

[0078] In this embodiment, the power supply filtering circuit further includes a varistor and a second discharge tube. A varistor and a second discharge tube are connected in series between each pair of adjacent phase lines of the three-phase power supply; that is, a varistor and a second discharge tube are connected in series between the R-phase line and the S-phase line, between the R-phase line and the T-phase line, and between the S-phase line and the T-phase line. Furthermore, any one of the three phase lines of the three-phase power supply is grounded through the series-connected varistor and second discharge tube. It should be noted that... Figure 5 ZNR1, ZNR2, ZNR3 and ZNR14 represent varistors, and DSA1, DSA2, DSA3 and DSA4 represent second discharge tubes.

[0079] In this embodiment, the power supply filtering circuit further includes an X capacitor and a Y capacitor. An X capacitor is connected in series between every two adjacent phase lines of the three-phase power supply, and each phase line of the three-phase power supply is grounded through a Y capacitor. It should be noted that... Figure 5 In the diagram, C1, C3, and C5 represent X capacitors, while C2, C4, C6, C7, C8, and C9 represent Y capacitors.

[0080] Furthermore, the power supply filtering circuit also includes a filter inductor group, which comprises three resistor voltage divider networks. Each resistor voltage divider network includes multiple filter resistors connected in series. Each phase of the three-phase power supply has an X capacitor and a resistor voltage divider network connected in series. It should be noted that... Figure 5 In the diagram, R1~R5 represent five series-connected filter resistors in a resistor voltage divider network, R6~R10 represent five series-connected filter resistors in a resistor voltage divider network, and R11~R15 represent five series-connected filter resistors in a resistor voltage divider network. Thus, R1~R5, R6~R10, and R11~R15 serve as filter resistors for three resistor voltage divider networks, respectively.

[0081] Understandably, each phase line of the three-phase power supply is connected in series with a varistor and a second discharge tube to absorb transient overvoltages and suppress surge currents, achieving overvoltage and overcurrent protection. Subsequently, an X capacitor is connected between each phase line to form a differential-mode filter path, effectively filtering out high-frequency differential-mode noise between phase lines. A common-mode inductor is also included in the circuit; its high impedance to common-mode current significantly attenuates common-mode interference signals present in the same direction on the three phase lines, reducing electromagnetic radiation. Furthermore, the filter inductor group works in conjunction with the X and Y capacitors to form a multi-stage composite filter network, enhancing the suppression capability against complex electromagnetic interference. The Y capacitor is connected across each phase line and ground, providing a low-impedance discharge path for common-mode noise and establishing a reliable grounding reference point, further enhancing the system's electromagnetic compatibility and operational stability. It should be noted that... Figure 5 In the diagram, C10, C12, and C14 represent X capacitors that work with the filter inductor group, and C11, C13, and C15 represent Y capacitors that work with the filter inductor group.

[0082] In one embodiment of the present invention, the power control system includes an inverter module, the inverter module includes a compressor inverter unit, the compressor inverter unit includes a compressor inverter circuit, the power control system further includes a compressor current sampling and protection circuit, the processor is connected to the compressor inverter circuit and is used to control its switching action to drive the compressor to run, and the compressor current sampling and protection circuit is connected between the compressor inverter circuit and the processor.

[0083] The processor is configured to output a first digital signal with a corresponding duty cycle based on the compressor model.

[0084] The compressor current sampling and protection circuit is configured to generate a first current protection threshold based on a first digital signal; and to collect the three-phase current output by the compressor inverter unit, compare the three-phase current output by the compressor inverter unit with the first current protection threshold, and send a first fault protection signal to the processor if the three-phase current exceeds the first current protection threshold.

[0085] Understandably, the compressor current sampling and protection circuit is connected between the compressor inverter unit and the processor to realize current signal acquisition and fault protection functions. The processor, based on the specific model of the connected compressor, calls preset control parameters and outputs a first digital signal with a corresponding duty cycle. This first digital signal represents the rated operating characteristics and safe operating range for that compressor model. The compressor current sampling and protection circuit receives this first digital signal and dynamically generates an appropriate first current protection threshold, thus achieving adaptive setting of the protection threshold. The compressor current sampling and protection circuit acquires the three-phase current output from the compressor inverter unit in real time, converts and processes the three-phase current to obtain the corresponding measured voltage signal, and, based on the measured voltage signal and the first current protection threshold, determines whether there are abnormal operating conditions such as overcurrent or short circuit. If an abnormal operating condition such as overcurrent or short circuit is determined, a first fault protection signal is immediately sent to the processor, triggering the processor to execute corresponding protection actions, such as blocking drive signals and issuing a shutdown alarm, thereby enhancing the safety and operational reliability of the power control system.

[0086] It should be noted that the power control system in this embodiment can automatically match the optimal current protection threshold according to different compressor models, thereby improving the accuracy and flexibility of protection and avoiding false protection or protection lag problems caused by fixed thresholds.

[0087] It should be noted that this embodiment dynamically adjusts the first current protection threshold generated by the compressor current sampling and protection circuit by adjusting the duty cycle of the first digital signal output by the processor, thereby adapting to the load requirements of different types and specifications of compressors. Since different compressor models have different rated currents, starting characteristics, and overload tolerances, traditional solutions typically require the design or modification of hardware parameters (such as resistor voltage division ratio, reference voltage source, or comparator threshold circuit) for each model, resulting in poor circuit versatility and high production and maintenance costs. This embodiment, however, does not require changes to the hardware structure of the compressor current sampling and protection circuit; the corresponding protection threshold can be flexibly set simply by configuring the duty cycle output by the processor through software. This significantly improves the adaptability to various compressor models, thereby enhancing the system's versatility and reducing the types of materials and maintenance costs in product development and production.

[0088] In one embodiment of the present invention, the power control system further includes a compressor drive circuit, which serves as a signal interface and power drive bridge between the processor and the compressor inverter unit. The processor generates corresponding PWM control signals based on the compressor's operating requirements and transmits them to the gates of the power switching devices (such as IGBTs or MOSFETs) in the compressor inverter unit via the compressor drive circuit. The compressor drive circuit isolates, amplifies, and shapes the received control signals, possessing sufficient drive capability to ensure that the switching devices can be turned on and off quickly and reliably, thereby precisely controlling the on / off timing of the inverter bridge and achieving efficient DC-to-AC inverter output. By adjusting the frequency and duty cycle of the PWM signal, the processor can dynamically adjust the amplitude and frequency of the output voltage, thereby achieving precise control of the compressor speed, torque, and operating status to meet the cooling or heating requirements under different operating conditions.

[0089] In one embodiment of the present invention, the compressor current sampling and protection circuit 40 is used to realize real-time monitoring and overcurrent protection of the output current of the compressor inverter unit, such as... Figure 7 As shown, the compressor current sampling and protection circuit 40 includes a current sampling resistor 41, a proportional and addition operation circuit 42, a bias circuit 43, a comparator circuit 44, and a voltage conversion circuit unit.

[0090] Among them, one end of the current sampling resistor 41 is connected to the compressor inverter unit, and the other end of the current sampling resistor 41 is grounded. The current sampling resistor 41 is used to convert the three-phase current into a voltage signal. The first input terminal of the proportional and adder circuit 42 is connected to one end of the current sampling resistor 41, and the second input terminal of the proportional and adder circuit 42 is grounded. The bias circuit 43 is connected to the first input terminal of the proportional and adder circuit 42 and is used to provide a bias voltage for the proportional and adder circuit 42. The first input terminal of the comparator circuit 44 is connected to the output terminal of the proportional and adder circuit 42, and the output terminal of the comparator circuit 44 is connected to the processor. The voltage conversion circuit unit is connected between the processor and the second input terminal of the comparator circuit 44 and is used to generate a first current protection threshold based on the first digital signal.

[0091] Understandably, the current sampling resistor 41 is connected in the output circuit of the compressor inverter unit to convert the three-phase current signal output by the compressor inverter unit into a corresponding voltage signal for subsequent processing; the first input terminal of the proportional and adder circuit 42 is connected to this voltage signal, and the second input terminal is grounded, used to scale and condition the sampled voltage to match the input range of subsequent circuits; the bias circuit 43 is connected to the first input terminal of the proportional and adder circuit 42 to provide it with a stable DC bias voltage, ensuring that the voltage signal remains within a suitable level range during the operation, avoiding signal distortion or cutoff; the voltage conversion circuit... The circuit unit receives a first digital signal with a specific duty cycle from the processor, and converts it into a reference voltage corresponding to the duty cycle, i.e., the first current protection threshold, through filtering, voltage regulation, or digital-to-analog conversion, and outputs it to the second input terminal of the comparator circuit 44. The first input terminal of the comparator circuit 44 is connected to the output terminal of the proportional and adder circuit 42, and is used to compare the conditioned actual current voltage signal with the first current protection threshold in real time. When the voltage corresponding to the actual current is detected to exceed the first current protection threshold, the output state is immediately flipped, and a first fault protection signal is sent to the processor to trigger the system to perform overcurrent protection action.

[0092] It should be noted that the compressor current sampling and protection circuit 40 achieves dynamic adjustability of the protection threshold through the voltage conversion circuit unit, which can be adapted to different models of compressors without changing the hardware, thus improving the flexibility and versatility of the system.

[0093] Optional, such as Figure 7 As shown, a voltage divider filter circuit 45 is provided between the first input terminal of the comparator circuit 44 and the output terminal of the proportional and adder circuit 42, for further signal processing of the voltage signal after being conditioned by the proportional and adder circuit 42.

[0094] Understandably, the voltage divider filter circuit 45 adjusts the amplitude of the signal input to the comparator circuit 44 through resistor voltage division, ensuring that it is within the allowable input voltage range of the comparator circuit 44, preventing the comparator circuit 44 from malfunctioning or being damaged due to excessively high signal amplitude. The voltage divider filter circuit 45 effectively suppresses high-frequency noise, switching interference, or transient glitches that may be introduced during signal transmission by introducing filter capacitors or RC low-pass filter structures, improving the stability and reliability of the signal, avoiding false triggering protection problems caused by comparator misjudgment due to noise interference, improving the accuracy of overcurrent detection and the system's anti-interference capability, thereby ensuring the safe and stable operation of the power control system.

[0095] Furthermore, the compressor current sampling and protection circuit 40 also includes a sampling filter circuit connected to the comparator output terminal. The sampling filter circuit is used to filter and shape the signal output by the comparator circuit 44.

[0096] The sampling filter circuit includes a sampling filter resistor and a sampling filter capacitor, which are used to filter and shape the fault signal output by the comparator, thereby improving the stability and anti-interference capability of signal transmission. One end of the sampling filter resistor is connected to the output of the comparator, and the other end serves as the signal output of the compressor current sampling and protection circuit 40, connected to the fault detection pin of the processor. The sampling filter capacitor is connected between this output and ground, forming an RC low-pass filter structure.

[0097] In one embodiment of the present invention, such as Figure 7 As shown, the voltage conversion circuit unit includes an integrator circuit 46 and an inverting circuit 47; the first input terminal of the integrator circuit 46 is connected to the processor, and the second input terminal of the integrator circuit 46 is grounded; the first input terminal of the inverting circuit 47 is connected to the output terminal of the integrator circuit 46, the second input terminal of the inverting circuit 47 is grounded, and the output terminal of the inverting circuit 47 is connected to the second input terminal of the comparator circuit 44.

[0098] Understandably, the voltage conversion circuit unit includes an integrator circuit 46 and an inverter circuit 47, used to convert the processor's output, a first digital signal with an adjustable duty cycle (usually a PWM signal), into a stable DC voltage signal, which serves as the reference input of the comparator circuit 44, i.e., the first current protection threshold. The integrator circuit 46 has its first input connected to the processor's PWM output pin and its second input grounded. Its function is to perform low-pass filtering and integration on the received pulse-width modulation signal, converting PWM signals with different duty cycles into DC voltage signals proportional to their average value. The larger the duty cycle, the higher the output DC voltage, thus realizing the conversion of the digital control signal into an analog voltage threshold. This integrated output signal is then input to the first input of the inverter circuit 47, whose second input is grounded. The second input of the inverter circuit 47 inverts and amplifies the voltage signal output by the integrator circuit 46 or adjusts its level to match the input voltage range and polarity required by the comparator, ensuring that the final output protection threshold voltage is consistent with the system design logic. The output of the inverting circuit 47 is connected to the second input (positive input) of the comparator circuit 44, providing an accurate and adjustable reference voltage for overcurrent detection.

[0099] In one embodiment of the present invention, the power control system further includes a fan current sampling and protection circuit, which is connected between the fan inverter unit and the processor.

[0100] The processor is also configured to output a second digital signal with a corresponding duty cycle based on the wind turbine model; the wind turbine current sampling and protection circuit is configured to generate a second current protection threshold based on the second digital signal; and to collect the three-phase current output by the wind turbine inverter unit, compare the three-phase current output by the wind turbine inverter unit with the second current protection threshold, and send a second fault protection signal to the processor if the collected three-phase current output by the wind turbine inverter unit exceeds the second current protection threshold.

[0101] It should be noted that the fan current sampling and protection circuit adopts the same circuit structure as the compressor current sampling and protection circuit 40. It receives a second digital signal (such as a PWM signal) with an adjustable duty cycle based on the fan model output from the processor, and generates a corresponding second current protection threshold via an integrator and inverter circuit. This threshold is used as a reference voltage input to the positive input of the comparator. The three-phase current output from the fan inverter unit is converted into a voltage signal through a sampling resistor, and after proportional conditioning, bias superposition, and filtering, it is sent to the negative input of the comparator. The comparator compares the actual current signal with the set protection threshold in real time. When it detects that the voltage signal corresponding to the three-phase current exceeds the second current protection threshold, it immediately sends a fault protection signal to the processor, triggering the system to execute the corresponding protection action.

[0102] In one embodiment of the present invention, the power control system further includes a fan drive circuit connected between the processor and the fan inverter unit, serving as a drive interface for the control signal. The processor generates a corresponding PWM control signal based on heat dissipation requirements or system operating status, and transmits it to the gate of the power switching device (such as an IGBT or MOSFET) in the fan inverter unit via the fan drive circuit. The fan drive circuit isolates, levels, and amplifies the control signal to ensure sufficient driving capability, enabling rapid and reliable switching of the switching devices in the fan inverter unit. This converts the DC bus voltage into a three-phase AC power with adjustable frequency and voltage, driving the cooling fan motor. By adjusting the parameters of the PWM signal, the processor can precisely control the fan speed, achieving on-demand speed adjustment and realizing energy saving, noise reduction, and optimized heat dissipation.

[0103] An embodiment of the fourth aspect of the present invention provides an air conditioning system, which includes a compressor and a power control system provided in any of the above embodiments.

[0104] It is understood that the air conditioning system includes a compressor and the power control system provided in any of the aforementioned embodiments. The power control system, as the core of the air conditioning electronic control, integrates an independently packaged rectifier module, a three-phase imbalance detection circuit, a power supply filter circuit, and a processor. The power control system connects to a three-phase AC power supply. After the power supply filter circuit suppresses grid interference, the rectifier module converts the AC power into stable DC power, providing a high-quality DC bus voltage for the compressor drive circuit. Simultaneously, the three-phase imbalance detection circuit monitors the grid voltage status in real time. Once a phase loss, voltage imbalance, or frequency abnormality is detected, the processor immediately activates the protection mechanism to prevent the compressor from operating under abnormal conditions and causing damage. This power control system not only improves rectification efficiency and anti-interference capabilities but also significantly enhances the operational reliability, energy efficiency, and long-term stability of the air conditioning system through its protection functions.

[0105] It should be noted that, to improve the performance of the rectifier module, the size of the rectifier chip is increased, the current distribution inside the module is optimized, and the current density is reduced, making the conduction path more uniform. This reduces localized overheating and achieves a better balance between heat generation and dissipation, significantly improving overall heat dissipation efficiency. Simultaneously, the larger chip area enhances the device's thermal capacity and current-carrying capacity, giving it stronger resilience to instantaneous high-current surges caused by compressor start-ups and shutdowns, grid fluctuations, etc. This effectively improves the rectifier module's surge current withstand limit, significantly enhancing its operational stability and long-term reliability under complex operating conditions such as frequent start-ups and shutdowns. This provides a safer and more durable power conversion guarantee for demanding applications such as air conditioning.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rectifier module, characterized in that, include: A rectifier package housing, wherein the rectifier package housing is provided with pins; A rectifier circuit, which is encapsulated within a rectifier package and electrically connected to the pins, includes at least one rectifier bridge arm and is used to convert input AC power into DC power.

2. The rectifier module according to claim 1, characterized in that, The side of the rectifier packaging housing is provided with a mounting part.

3. The rectifier module according to claim 1 or 2, characterized in that, The surface of the rectifier package housing where the pins are located has a positioning part.

4. A power conversion module, characterized in that, The invention includes an inverter module and a rectifier module as described in any one of claims 1 to 3, wherein the inverter module includes an inverter package housing and an inverter circuit packaged within the inverter package housing.

5. A power control system, characterized in that, include: The rectifier module as described in any one of claims 1 to 3, wherein the input terminal of the rectifier circuit is connected to a three-phase power supply; processor; A three-phase imbalance detection circuit is connected between the processor and the three-phase power supply; The three-phase imbalance detection circuit is configured to step down the three-phase voltage output by the three-phase power supply and generate a corresponding low-voltage detection signal to be transmitted to the processor. The processor is configured to determine whether the three-phase voltage output by the three-phase power supply is balanced based on the low-voltage detection signal, and to generate a fault protection control signal when the three-phase voltage is determined to be unbalanced.

6. The power control system according to claim 5, characterized in that, The three-phase imbalance detection circuit includes three voltage detection circuits, which are respectively connected to the three phase lines of the three-phase power supply. Each voltage detection circuit includes: A voltage divider circuit is used to reduce the voltage of each phase output by the three-phase power supply to generate a corresponding low-voltage detection signal. The input terminal of the voltage divider circuit is connected to the phase line corresponding to the three-phase power supply. A signal filtering circuit is provided, the input of which is connected to the output of the voltage divider circuit. The signal filtering circuit is used to filter the low-voltage detection signal, and the output of the signal filtering circuit is connected to the processor.

7. The power control system according to claim 6, characterized in that, The voltage detection circuit further includes: A protection circuit is connected to the output terminal of the signal filtering circuit. The protection circuit is used to limit the voltage amplitude of the low-voltage detection signal filtered by the signal filtering circuit to a preset safe voltage range.

8. The power control system according to claim 6, characterized in that, The voltage divider circuit includes multiple voltage divider resistors connected in series, and / or... The signal filtering circuit includes an RC filter circuit.

9. The power control system according to any one of claims 5 to 8, characterized in that, It also includes a power supply filter circuit, which is connected between the three-phase power supply and the rectifier circuit.

10. The power control system according to claim 9, characterized in that, The power supply filtering circuit includes a common-mode inductor and a first discharge tube. The common-mode inductor includes three coils. One end of each of the three coils is connected to one of the three phase lines of the three-phase power supply, and the other end of each coil is connected to a rectifier circuit. The first discharge tube is connected in parallel to each coil.

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