Power factor correction circuit, current regulation method, power supply module and server

Abstract

The invention relates to a power factor correction circuit, a current regulation method, a power supply module and a server. The circuit comprises a voltage outer loop, a current inner loop, a double-closed-loop control logic calculation module, a switch tube and a PWM (Pulse Width Modulation). The voltage outer loop comprises a first amplifier and a first proportional-integral controller, and the current inner loop comprises a second amplifier and a second proportional-integral controller. The input end of the first amplifier is used for receiving a preset reference voltage and receiving an output voltage from PWM, and the input end of the second amplifier is used for receiving a current feedback signal. The first end of the double-closed-loop control logic calculation module is connected with the output end of the first proportional-integral controller, the second end is connected with the input end of the second amplifier, and the third end is connected with power supply equipment. The PWM is used for adjusting the inductive current waveform of the power factor correction circuit. In this way, the harmonic component in the signal input into the power factor correction circuit can be reduced, and then the quality of the output signal of the power factor correction circuit is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electric power engineering technology, and in particular to a power factor correction circuit, a current regulation method, a power supply module and a server. Background Art

[0002] With the continuous advancement of power supply technology, relevant parameters of power quality, such as ITHD (Input Total Harmonic Distortion) and PF (Power Factor), have gradually become key indicators for measuring the performance of power systems and have received more and more attention.

[0003] In power systems, ITHD is used to measure the degree of distortion of the current waveform in the power system, specifically the ratio of the RMS value of the harmonic current to the RMS value of the fundamental current. For example, assuming that the current waveform in a power system contains a fundamental wave (50Hz), several harmonics (such as 3rd, 5th, 7th, etc., the RMS value of the fundamental current is 10A and the RMS value of all harmonic currents is 2A, then ITHD can be calculated as: Under ideal conditions, the voltage and current waveforms of the power system should be standard periodic sine waves. Among them, the cosine value cosΦ of the phase difference Φ between the voltage and current of the power system is defined as the PF value. The change of the PF value of the power system is mainly caused by the lead or lag of the voltage phase and the current phase. When the phase difference Φ is large and the PF value is low, the power grid loss of the power system will increase and the operation efficiency of the power grid will be reduced.

[0004] However, in the actual operation of the power system, due to the presence of a large number of power supply and use equipment with nonlinear impedance characteristics, such as UPS (Uninterruptible Power Supply), the power system ITHD increases, the phase difference Φ increases, and the PF value decreases. This current distortion condition not only reduces the efficiency of power generation, transmission and utilization of power systems, but may also cause overheating, vibration, noise, accelerated insulation aging, shortened equipment life, equipment failure, and even burning of its electrical equipment. In addition, this current distortion condition may also cause local resonance in the power system, amplify the harmonic content, and cause secondary damage to communication equipment and electronic equipment. Summary of the invention

[0005] In response to the above-mentioned deficiencies or shortcomings, the present application provides a power factor correction circuit, a current regulation method, a power supply module and a server, which can reduce the harmonic components in the signal input to the power factor correction circuit, thereby improving the output signal quality of the circuit to avoid damage to the power receiving equipment.

[0006] According to a first aspect, the present application provides a power factor correction circuit, including a voltage outer loop, a current inner loop, a dual closed-loop control logic calculation module, a switch tube, and a pulse width modulator. The voltage outer loop includes a first amplifier and a first proportional integral controller, and the current inner loop includes an inductor, a second amplifier, and a second proportional integral controller.

[0007] The input terminal of the first amplifier is used for receiving a preset reference voltage and an output voltage from a pulse width modulator, and the input terminal of the second amplifier is used for receiving a current feedback signal of the inductor.

[0008] The first end of the double closed-loop control logic calculation module is connected to the output end of the first proportional-integral controller, the second end is connected to the input end of the second amplifier, and the third end is connected to an external power supply device.

[0009] The voltage outer loop is used to generate a current reference signal for the current inner loop according to the voltage value of the preset reference voltage and the voltage value of the output voltage to provide a current reference value.

[0010] The current inner loop is used to generate an input current regulation signal for the pulse width modulator according to the current reference value and the inductor current value of the current feedback signal.

[0011] The pulse width modulator is used to generate a pulse width modulation signal according to the current regulation signal to control the on and off of the switch tube, thereby adjusting the inductor current waveform of the power factor correction circuit.

[0012] In some embodiments, the power factor correction circuit further comprises a filter capacitor, a first end of which is connected to the power supply device and a second end of which is grounded. The filter capacitor is used to adjust the input impedance of the power supply device to the dual closed-loop control logic calculation module.

[0013] In some embodiments, the power factor correction circuit further includes a rectifier, and the power supply device outputs an AC signal. The AC input end of the rectifier is connected to the power supply device, and the DC output end of the rectifier is respectively connected to the first end of the filter capacitor and the third end of the dual closed-loop control logic calculation module.

[0014] In some embodiments, the power supply device of the power factor correction circuit is a power grid or an uninterruptible power supply device, and the power supply device is installed with one or more X-type filter capacitors on the line connected to the dual closed-loop control logic calculation module.

[0015] According to a second aspect, the present application provides a current regulation method for a power factor correction circuit. The current regulation method is based on the power factor correction circuit of any one of the above embodiments. The method includes:

[0016] In response to the power input signal received by the dual closed-loop control logic calculation module, the voltage value of the preset reference voltage and the voltage value of the pulse width modulator output voltage are acquired by the first amplifier.

[0017] According to the magnitude relationship between the voltage value of the preset reference voltage and the voltage value of the output voltage, the amplified first current regulation signal is input to the first proportional-integral controller, so that the first proportional-integral controller performs a proportional-integral operation based on the first current regulation signal to obtain an adjusted first current regulation signal.

[0018] The input voltage value of the power input signal is calculated and obtained through the double closed-loop control logic calculation module, and the current reference value is calculated according to the input voltage value and the adjusted first current regulation signal.

[0019] The inductor current value and the current reference value of the current feedback signal are obtained through the second amplifier.

[0020] According to the magnitude relationship between the inductor current value of the current feedback signal and the current reference value, the amplified second current regulation signal is input to the second proportional-integral controller, so that the second proportional-integral controller performs a proportional-integral operation based on the second current regulation signal to obtain an adjusted second current regulation signal.

[0021] The pulse width modulator controls the on-off of the switch tube according to the adjusted second current regulation signal, thereby adjusting the inductor current waveform, output power and current value of the power factor correction circuit.

[0022] In some embodiments, according to the magnitude relationship between the voltage value of the preset reference voltage and the voltage value of the output voltage, inputting the amplified first current regulating signal to the first proportional-integral controller includes:

[0023] The voltage value of the preset reference voltage and the voltage value of the output voltage are calculated by the first amplifier to obtain an amplified negative current regulation signal or a positive current regulation signal as the first current regulation signal.

[0024] If the voltage value of the output voltage is greater than the voltage value of the preset reference voltage, a negative current regulation signal is input to the first proportional-integral controller. Alternatively, if the voltage value of the output voltage is less than the voltage value of the preset reference voltage, a positive current regulation signal is input to the first proportional-integral controller.

[0025] In some embodiments, according to the magnitude relationship between the inductor current value of the current feedback signal and the current reference value, inputting the amplified second current regulation signal to the second proportional-integral controller includes:

[0026] The second amplifier performs a current inner loop calculation on the inductor current value of the current feedback signal and the current reference value to obtain an amplified current pull-up signal or a current pull-down signal as a second current regulation signal.

[0027] If the inductor current value of the current feedback signal is less than the current reference value, a current pull-up signal is input to the second proportional-integral controller. Alternatively, if the inductor current value of the current feedback signal is greater than the current reference value, a current pull-down signal is input to the second proportional-integral controller.

[0028] In some embodiments, the input voltage value is determined by the output voltage value of the power supply device and the capacitance of the filter capacitor. The current reference value is calculated based on the input voltage value and the adjusted first current regulation signal, including:

[0029] The adjusted first current regulation signal is multiplied by the input voltage value to obtain a current reference value.

[0030] According to a third aspect, the present application provides a power supply module, comprising any one of the power factor correction circuits in the above embodiments, wherein the input end of the power supply module is connected to a power supply device, and the output end thereof is connected to an electrical device. The third end of the dual closed-loop control logic calculation module is connected to the input end of the power supply module, and the output end of the pulse width modulator is connected to the output end of the power supply module.

[0031] According to a fourth aspect, the present application provides a server, comprising the power supply module of the above embodiment, and the server is an electric power-consuming device of the above embodiment.

[0032] The power factor correction circuit provided by the present application, when the dual closed-loop control logic calculation module receives the power input signal, first generates a current reference signal for the current inner loop through the voltage outer loop according to the voltage value of the preset reference voltage and the voltage value of the output voltage to provide a current reference value. Then, through the current inner loop, an input current adjustment signal is generated for the pulse width modulator according to the current reference value and the inductor current value. Among them, the dual closed-loop control logic calculation module calculates the current reference value by calculating the input voltage value obtained by the power input signal and the first current adjustment signal adjusted by the first proportional integral controller. Then the pulse width modulator generates a pulse width modulation signal according to the current adjustment signal to control the on and off of the switch tube, which can reduce the harmonic component in the signal input to the power factor correction circuit, thereby improving the output signal quality of the power factor correction circuit to avoid damage to the power receiving equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a topological structure of a PFC circuit in one or more embodiments of the present application;

[0034] Figure 2A flow chart of a current regulation method of a PFC circuit in one or more embodiments of the present application;

[0035] Figure 3 A flowchart of a method for inputting an amplified first current regulating signal to a first proportional-integral controller according to a magnitude relationship between a reference voltage value and an input voltage value in one or more embodiments of the present application;

[0036] Figure 4 The present invention is a flowchart of a method for inputting an amplified second current regulating signal to a second proportional-integral controller according to a magnitude relationship between an inductor current value and a current reference value in one or more embodiments of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an electronic component or device is considered to be "connected", "located", or "mounted" on another electronic component or device, it may be directly disposed on the other electronic component or device or there may be intermediate parts and components at the same time. The terms "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only.

[0039] According to a first aspect, the present application provides a power factor correction circuit, which may be referred to as a PFC (Power Factor Correction) circuit. Figure 1 As shown, the PFC circuit includes a voltage outer loop A-PI1, a current inner loop B-PI2, a double closed-loop control logic calculation module Calculate current reference, a switch tube, and a pulse width modulator PWM (Pulse Width Modulation). The voltage outer loop A-PI1 includes a first amplifier A and a first proportional integral controller PI1, and the current inner loop B-PI2 includes an inductor, a second amplifier B and a second proportional integral controller PI2.

[0040] An input terminal of the first amplifier A is used to receive a preset reference voltage and an output voltage from a pulse width modulator, and an input terminal of the second amplifier B is used to receive a current feedback signal Current Feed-back of the inductor.

[0041] The first end of the double closed-loop control logic calculation module Calculate current reference is connected to the output end of the first proportional integral controller PI1, the second end is connected to the input end of the second amplifier B, and the third end is connected to an external power supply device.

[0042] The voltage outer loop A-PI1 is used to generate a current reference signal for the current inner loop B-PI2 to provide a current reference value I_Ref according to a voltage value PFC_Ref of a preset reference voltage and a voltage value PFC_Vo of an output voltage.

[0043] The current inner loop B_PI2 is used to generate an input current regulating signal for the pulse width modulator PWM according to the current reference value I_Ref and the inductor current value I_L of the current feedback signal Current Feed-back.

[0044] The pulse width modulator PWM is used to generate a pulse width modulation PWM signal according to the current regulation signal to control the on and off of the switch tube, thereby adjusting the inductor current waveform of the power factor correction circuit.

[0045] Among them, the switch tube can be a power MOSFET (Metal-Oxide-Semiconductor Field-EffectTransistor), IGBT (Insulated Gate BipolarTransistor), BJT (Bipolar Junction Transistor). In addition, if the PFC circuit adopts the Boost topology, the inductor current of the PFC circuit does not refer to the input current of the power supply device to the double closed-loop control logic calculation module Calculate current reference, but the current adjusted by the inductor of the Boost circuit. Then, the switch tube is used to control its own on and off time according to the pulse width modulation PWM signal, adjust the inductor current waveform and make it in phase with the input voltage of the power supply device, so as to achieve power factor correction to avoid damage to the power-consuming device. In addition, the power supply device can be an AC power grid, a DC power supply or an uninterruptible power supply, and the power-consuming device can be a server, a computer or an audio device.

[0046] Exemplarily, when the dual closed-loop control logic calculation module Calculate current reference receives a power input signal, it first generates a current reference signal for the current inner loop B-PI2 through the voltage outer loop A-PI1 according to the voltage value PFC_Ref of the preset reference voltage and the voltage value PFC_Vo of the output voltage to provide a current reference value I_Ref. Then, through the current inner loop B-PI2, an input current adjustment signal is generated for the pulse width modulator PWM according to the current reference value I_Ref and the inductor current value I_L. Among them, the dual closed-loop control logic calculation module Calculate current reference calculates the power input signal to obtain the input voltage value Vin, and then calculates the above-mentioned current reference value I_Ref according to the input voltage value Vin and the first current adjustment signal adjusted by the first proportional integral controller PI1. Then the pulse width modulator PWM generates a pulse width modulation PWM signal according to the current adjustment signal to control the on and off of the switch tube. Through such a dual closed-loop control design, the harmonic component in the signal input to the PFC circuit can be reduced, thereby improving the output signal quality of the PFC circuit to avoid damage to the power receiving device.

[0047] In some embodiments, Figure 1 As shown, the power factor correction circuit further includes a filter capacitor Filter-cap, the first end of which is connected to the power supply device, and the second end is grounded. The filter capacitor Filter-cap is used to adjust the input impedance of the power supply device to the double closed-loop control logic calculation module Calculate current reference.

[0048] In this PFC circuit, the first end of the filter capacitor Filter-cap is connected to the power supply device and the second end is grounded. In addition to adjusting the input impedance of the power supply device to the double closed-loop control logic calculation module Calculate current reference, it can also smooth the pulsation of the input voltage and current and reduce ITHD. Through reasonable selection, the filter capacitor can effectively improve the power factor of the PFC circuit, improve the quality of the sinusoidal waveform of the input current of the PFC circuit, and reduce high-frequency interference. In addition, by installing different types of filter capacitors, the PFC circuit can achieve high power factor and low ITHD under different load conditions, meeting the requirements of modern power systems for high efficiency and high compatibility.

[0049] For example, the filter capacitor is a thin film capacitor, which has high reliability and low ESR (Equivalent Series Resistance) characteristics, can effectively reduce the harmonic content of the input current, improve the power factor, reduce electromagnetic interference to the power grid, and improve the electromagnetic compatibility of the PFC circuit.

[0050] In some embodiments, Figure 1 As shown, the power factor correction circuit also includes a rectifier, and the power supply device outputs an AC signal. The AC input end of the rectifier is connected to the power supply device, and the DC output end of the rectifier is respectively connected to the first end of the filter capacitor Filter-cap and the third end of the double closed-loop control logic calculation module Calculate current reference.

[0051] Specifically, the AC signal output by the power supply device is first rectified by the rectifier, the AC input end of the rectifier is connected to the power supply device, and the DC output end is connected to the first end of the filter capacitor Filter-cap and the third end of the double closed-loop control logic calculation module Calculate current reference. This installation method can also effectively improve the waveform of the input current, reduce ITHD, and improve the power factor. This is because in the PFC circuit, the capacitance selection of the filter capacitor Filter-cap needs to match the fluctuation range of the input voltage and the load characteristics to ensure that the PFC circuit can maintain a good power factor and low ITHD under different working conditions. Therefore, by selecting reasonable rectifier and filter capacitor models, the PFC circuit can achieve high power factor and high efficiency within a wide input voltage range while meeting electromagnetic compatibility requirements.

[0052] In some embodiments, Figure 1 As shown, the power supply device of the power factor correction circuit is a power grid or an uninterruptible power supply device UPS, and the power supply device is equipped with one or more X-type filter capacitors on the line connected to the double closed-loop control logic calculation module Calculate current reference.

[0053] In this PFC circuit, the power supply equipment is a power grid or UPS, and one or more X-type filter capacitors are installed on the line connected to the dual closed-loop control logic calculation module Calculate current reference. This design aims to optimize the electromagnetic compatibility and input current quality of the circuit. The X-type filter capacitor is connected across the live wire (L) and the neutral wire (N), and is mainly used to suppress differential mode interference. Its function is to filter out high-frequency noise and ripple on the power line, thereby reducing electromagnetic interference. Among them, the selection of X-type filter capacitors needs to consider the withstand voltage level and capacity. According to the IEC 60384-14 standard, X-type filter capacitors are divided into X1, X2 and X3 levels, among which the X1 capacitor has a withstand voltage greater than 2.5kV and is suitable for high-voltage application scenarios.

[0054] Therefore, in this PFC circuit, the ITHD of the input current can be reduced by selecting an X-type filter capacitor with a reasonable capacitance and withstand voltage level, and the stable operation of the PFC circuit under different input voltages can be ensured. In addition, the X-type filter capacitor can also suppress differential mode interference, improve the sine waveform of the PFC circuit input current, improve the power factor, and thus reduce harmonic pollution to the power grid.

[0055] According to the second aspect, the present application provides a current regulation method of a power factor correction circuit, which can be applied to a current regulator, wherein a PFC circuit is provided in a power module PSU inside an electric device. The current regulator can regulate the input current of the PFC circuit built into the electric device. The electric device can be a whole cabinet server.

[0056] In some exemplary embodiments of the present application, Figure 2 As shown, the current regulation method is based on the PFC circuit of any one of the above embodiments, and includes the following steps:

[0057] Step S201: in response to a power input signal received by a dual closed-loop control logic calculation module, a voltage value of a preset reference voltage and a voltage value of a pulse width modulator output voltage are acquired by a first amplifier.

[0058] Among them, when the dual closed-loop control logic calculation module Calculate current reference receives the power input signal from the power grid or uninterruptible power supply UPS, the signal may contain high-frequency disturbances after rectification. The function of the first amplifier A is to perform preliminary amplification processing on the input signal to obtain the voltage value PFC_Ref of the preset reference voltage and the voltage value PFC_Vo of the output voltage. Then the current regulator adjusts the gain of the first amplifier A to ensure that the signal amplitude matches the subsequent control logic processing.

[0059] Step S202: According to the magnitude relationship between the voltage value of the preset reference voltage and the voltage value of the output voltage, the amplified first current regulation signal is input to the first proportional-integral controller, so that the first proportional-integral controller performs a proportional-integral operation based on the first current regulation signal to obtain an adjusted first current regulation signal.

[0060] Among them, after the current regulator inputs the first current regulation signal to the first proportional integral controller PI1 through the first amplifier A, the first proportional integral controller PI1 processes the signal through proportional and integral action. The proportional part quickly responds to the change of the first current regulation signal, while the integral part is used to eliminate the steady-state error and ensure the stability of the adjusted first current regulation signal.

[0061] Step S203: Calculate and obtain the input voltage value of the power input signal through the dual closed-loop control logic calculation module, and calculate and obtain the current reference value according to the input voltage value and the adjusted first current regulation signal.

[0062] Specifically, the current regulator calculates the input voltage value Vin of the power input signal through the double closed-loop control logic calculation module Calculate current reference, and dynamically calculates the current reference value I_Ref in combination with the adjusted first current regulation signal. This process requires the current regulator to be implemented based on the feedback mechanism of the voltage outer loop A-PI1 to ensure the stability of the pulse width modulator PWM output voltage and the rapid response to the change of the input voltage value Vin.

[0063] Step S204: obtaining the inductor current value and the current reference value of the current feedback signal through the second amplifier.

[0064] Specifically, the current regulator obtains the inductor current value I_L through the second amplifier B and compares it with the current reference value I_Ref. Then, the second amplifier B processes the amplified second current regulation signal to ensure that the amplitude and accuracy are suitable for the subsequent current inner loop control.

[0065] Step S205: According to the magnitude relationship between the inductor current value of the current feedback signal and the current reference value, the amplified second current regulation signal is input to the second proportional-integral controller, so that the second proportional-integral controller performs a proportional-integral operation based on the second current regulation signal to obtain an adjusted second current regulation signal.

[0066] Specifically, the current regulator generates a second current regulation signal according to the difference between the inductor current value I_L and the current reference value I_Ref. Then the current regulator inputs the signal into the second proportional integral controller PI2 through the second amplifier B, and the second proportional integral controller PI2 processes the signal through proportional and integral action. Among them, the proportional part of the second proportional integral controller PI2 is used to quickly respond to current changes, and the integral part is used to eliminate steady-state errors to ensure the stability of the inductor current.

[0067] Step S206: controlling the on-off of the switch tube according to the adjusted second current adjustment signal through the pulse width modulator, thereby adjusting the inductor current waveform, output power and current value of the power factor correction circuit.

[0068] Finally, the current regulator controls the on and off of the switch tube according to the adjusted second current regulation signal through the pulse width modulator PWM, which can change the duty cycle of the switch tube, and realize the precise regulation of the waveform and amplitude of the inductor current, thereby realizing the control of the output power and current. In this way, the inductor current and the input voltage are ensured to be in phase, and the ITHD of the PFC circuit input current is effectively reduced, thereby improving the overall performance of the PFC circuit.

[0069] In some embodiments, the current regulation method is based on the PFC circuit of any one of the above embodiments and Figure 1 According to the magnitude relationship between the voltage value PFC_Ref of the preset reference voltage and the voltage value PFC_Vo of the output voltage, the amplified first current regulation signal is input to the first proportional integral controller PI1, such as Figure 3 As shown, including:

[0070] Step S301: performing a voltage outer loop calculation on a voltage value of a preset reference voltage and a voltage value of an output voltage through a first amplifier to obtain an amplified negative current regulation signal or a positive current regulation signal as a first current regulation signal.

[0071] Step S302: If the voltage value of the output voltage is greater than the voltage value of the preset reference voltage, a negative current regulation signal is input to the first proportional-integral controller. Alternatively, if the voltage value of the output voltage is less than the voltage value of the preset reference voltage, a positive current regulation signal is input to the first proportional-integral controller.

[0072] Specifically, the current regulator can perform precise differential operations through the first amplifier A, detect the deviation between the two, and amplify it into a current regulation signal. Among them, the gain design of the first amplifier A needs to comprehensively consider the response speed and stability of the system to ensure that when the input voltage has high-frequency disturbances, it can quickly respond and output the corresponding current regulation signal. When the voltage value PFC_Vo of the output voltage is higher than the reference voltage value PFC_Ref, the first amplifier A outputs a negative current regulation signal; otherwise, it outputs a positive current regulation signal. This dynamic regulation mechanism can effectively suppress high-frequency disturbances of the input voltage and provide accurate input signals for the subsequent current inner loop B-PI2 control, thereby reducing the ITHD of the PFC circuit input current and improving the overall performance of the PFC circuit.

[0073] In some embodiments, the current regulation method is based on the PFC circuit of any one of the above embodiments; according to the magnitude relationship between the inductor current value I_L of the current feedback signal Current Feed-back and the current reference value I_Ref, the amplified second current regulation signal is input to the second proportional integral controller PI2, such as Figure 4 As shown, including:

[0074] Step S401: performing a current inner loop calculation on the inductor current value of the current feedback signal and the current reference value through a second amplifier to obtain an amplified current pull-up signal or a current pull-down signal as a second current regulation signal.

[0075] Step S402: If the inductor current value of the current feedback signal is less than the current reference value, a current pull-up signal is input to the second proportional-integral controller. Alternatively, if the inductor current value of the current feedback signal is greater than the current reference value, a current pull-down signal is input to the second proportional-integral controller.

[0076] Specifically, the current regulator can receive the inductor current value I_L and the current reference value I_Ref through the second amplifier B, compare the two through differential operation, and thus obtain a current regulation signal. This process is based on the fast response characteristics of the current inner loop B-PI2, which can quickly track the changes of the current reference value I_Ref and ensure the stability and accuracy of the inductor current value I_L. When the inductor current value I_L is lower than the current reference value I_Ref, the second amplifier B outputs a current pull-up signal to increase the inductor current value I_L; conversely, when the inductor current value I_L is higher than the current reference value I_Ref, the output current pull-down signal is used to reduce the inductor current value I_L. In this way, the current inner loop B-PI2 can effectively suppress the high-frequency disturbance of the input voltage, reduce the harmonic content of the current, and thus optimize the overall performance of the PFC circuit.

[0077] In some embodiments, the current regulation method is based on the PFC circuit of any one of the above embodiments; the input voltage value Vin is determined by the output voltage value of the power supply device and the capacitance of the filter capacitor. The current reference value I_Ref is calculated based on the input voltage value Vin and the adjusted first current regulation signal, including: multiplying the adjusted first current regulation signal by the input voltage value Vin to obtain the current reference value I_Ref.

[0078] Specifically, the current regulator can utilize the energy storage and smoothing effect of the filter capacitor Filter-cap to effectively suppress the high-frequency noise and pulsating components in the input voltage, and jointly determine the input voltage value Vin with the output voltage value of the power supply device, thereby providing a more stable input voltage signal for the subsequent current reference value I_Ref calculation. And when calculating the current reference value I_Ref, the adjusted first current regulation signal is multiplied by the input voltage value Vin. The core purpose of this multiplication operation is to dynamically adjust the current reference value I_Ref according to the real-time changes of the input voltage value Vin, to ensure that the inductor current can maintain the same phase as the input voltage, while adapting to the amplitude changes of the input voltage.

[0079] In this way, the PFC circuit can respond quickly and adjust the current reference value I_Ref when high-frequency disturbances occur in the input voltage, thereby optimizing the waveform of the inductor current to make it closer to an ideal sine wave, thereby reducing ITHD.

[0080] According to a third aspect, the present application provides a power supply module PSU, comprising any one of the PFC circuits in the above embodiments, wherein the input end of the power supply module PSU is connected to a power supply device, and the output end thereof is connected to a power consumption device. The third end of the double closed-loop control logic calculation module Calculate current reference is connected to the input end of the power supply module PSU, and the output end of the pulse width modulator PWM is connected to the output end of the power supply module PSU.

[0081] For specific limitations applicable to the power supply module PSU, please refer to the limitations of the current regulation method applicable to the power factor correction circuit mentioned above, which will not be repeated here. The above-mentioned modules applicable to the power supply module PSU can be implemented in whole or in part through software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0082] According to a fourth aspect, the present application provides a server, comprising the power supply module PSU of the above embodiment, and the server is an electric power-consuming device of the above embodiment.

[0083] Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (RamCUs), direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0084] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0086] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A power factor correction circuit, characterized in that: It includes a voltage outer loop, a current inner loop, a dual closed-loop control logic calculation module, a switch tube and a pulse width modulator; the voltage outer loop includes a first amplifier and a first proportional integral controller, and the current inner loop includes an inductor, a second amplifier and a second proportional integral controller; The input end of the first amplifier is used to receive a preset reference voltage and an output voltage from the pulse width modulator, and the input end of the second amplifier is used to receive a current feedback signal of the inductor; The first end of the dual closed-loop control logic calculation module is connected to the output end of the first proportional-integral controller, the second end is connected to the input end of the second amplifier, and the third end is connected to an external power supply device; The voltage outer loop is used to generate a current reference signal for the current inner loop to provide a current reference value according to the voltage value of the preset reference voltage and the voltage value of the output voltage; The current inner loop is used to generate an input current adjustment signal for the pulse width modulator according to the current reference value and the inductor current value of the current feedback signal; The pulse width modulator is used to generate a pulse width modulation signal according to the current regulation signal to control the on and off of the switch tube, thereby adjusting the inductor current waveform of the power factor correction circuit.

2. The power factor correction circuit according to claim 1, characterized in that: It also includes a filter capacitor, a first end of the filter capacitor is connected to the power supply device, and a second end of the filter capacitor is grounded; The filter capacitor is used to adjust the input impedance of the power supply device to the dual closed-loop control logic calculation module.

3. The power factor correction circuit according to claim 2, characterized in that: It also includes a rectifier, and the power supply device outputs an alternating current signal; The AC input end of the rectifier is connected to the power supply device, and the DC output end of the rectifier is respectively connected to the first end of the filter capacitor and the third end of the dual closed-loop control logic calculation module.

4. The power factor correction circuit according to claim 3, characterized in that: The power supply device is a power grid or an uninterruptible power supply device, and one or more X-type filter capacitors are installed on the line of the power supply device connected to the dual closed-loop control logic calculation module.

5. A current regulation method for a power factor correction circuit, characterized in that: The method is based on the power factor correction circuit according to any one of claims 1 to 4, and the method comprises: In response to the power input signal received by the dual closed-loop control logic calculation module, the voltage value of the preset reference voltage and the voltage value of the pulse width modulator output voltage are acquired by the first amplifier; According to the magnitude relationship between the voltage value of the preset reference voltage and the voltage value of the output voltage, inputting the amplified first current regulating signal into the first proportional-integral controller, so that the first proportional-integral controller performs a proportional-integral operation based on the first current regulating signal to obtain an adjusted first current regulating signal; The dual closed-loop control logic calculation module calculates and obtains an input voltage value of the power input signal, and calculates and obtains a current reference value according to the input voltage value and the adjusted first current regulation signal; Acquire the inductor current value and the current reference value of the current feedback signal through the second amplifier; According to the magnitude relationship between the inductor current value of the current feedback signal and the current reference value, inputting the amplified second current regulating signal to the second proportional-integral controller, so that the second proportional-integral controller performs a proportional-integral operation based on the second current regulating signal to obtain an adjusted second current regulating signal; The pulse width modulator controls the on-off of the switch tube according to the adjusted second current regulation signal, thereby adjusting the input current waveform, output power and current value of the power factor correction circuit.

6. The current regulation method according to claim 5, characterized in that: The step of inputting the amplified first current regulating signal to the first proportional-integral controller according to the magnitude relationship between the voltage value of the preset reference voltage and the voltage value of the output voltage comprises: Performing a voltage outer loop calculation on the voltage value of the preset reference voltage and the voltage value of the output voltage through the first amplifier to obtain the amplified negative current regulation signal or the positive current regulation signal as the first current regulation signal; If the voltage value of the output voltage is greater than the voltage value of the preset reference voltage, inputting the current negative regulation signal to the first proportional-integral controller; Alternatively, if the voltage value of the output voltage is less than the voltage value of the preset reference voltage, the current positive regulation signal is input to the first proportional-integral controller.

7. The current regulation method according to claim 5, characterized in that: The step of inputting the amplified second current regulating signal to the second proportional-integral controller according to the magnitude relationship between the inductor current value of the current feedback signal and the current reference value comprises: Performing a current inner loop calculation on the inductor current value I_L of the current feedback signal and the current reference value through the second amplifier to obtain the amplified current pull-up signal or the current pull-down signal as the second current regulation signal; If the inductor current value of the current feedback signal is less than the current reference value, inputting the current pull-up signal to the second proportional-integral controller; Alternatively, if the inductor current value of the current feedback signal is greater than the current reference value, the current pull-down signal is input to the second proportional-integral controller.

8. The current regulation method according to claim 5, characterized in that: The input voltage value is determined by the output voltage value of the power supply device and the capacitance of the filter capacitor; the current reference value is calculated according to the input voltage value and the adjusted first current regulation signal, including: The adjusted first current regulation signal is multiplied by the input voltage value to obtain the current reference value.

9. A power module, characterized in that: Comprising the power factor correction circuit as claimed in any one of claims 1 to 4, the input end of the power module is connected to the power supply device, and the output end of the power module is connected to the power consumption device; The third terminal of the dual closed-loop control logic calculation module is connected to the input terminal of the power module, and the output terminal of the pulse width modulator is connected to the output terminal of the power module.

10. A server, characterized in that: Including the power supply module as described in claim 9, the server is the power-consuming device.

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