Rectifier power supply for pulsed power decoupling and control method thereof

Abstract

This invention discloses a rectifier power supply and its control method for pulsed power decoupling, belonging to the field of converter technology. The rectifier power supply includes a controller, and sequentially connected power factor correction circuit, input capacitor, resonant isolation circuit, buffer capacitor, voltage correction circuit, and output capacitor. The resonant isolation circuit includes a resonant inverter circuit. The power factor correction circuit is also connected to an external AC power grid, and the output capacitor is also connected to an external pulsed load. The controller collects the input three-phase voltage, input three-phase current, and output voltage of the power factor correction circuit in real time, as well as the output voltage of the resonant isolation circuit and the voltage correction circuit. It then generates drive signals for each switching device in the power factor correction circuit, resonant isolation circuit, and voltage correction circuit, and performs corresponding control. This invention achieves constant grid-side power under pulsed loads, improving the power density and power quality of the rectifier power supply.

Description

Technical Field

[0001] This invention belongs to the field of converter technology, specifically relating to a rectified power supply for pulse power decoupling and its control method. Background Technology

[0002] Currently, the field of pulsed power technology and related equipment is characterized by a dual-driven trend of "scientific research breakthroughs" and "industrial policy support." With the development of industrial technology and defense equipment, the power characteristics of more and more production and defense equipment are exhibiting pulsed features. The power spectrum of this type of pulsed load is characterized by intermittency, suddenness, and repetition, while its peak power to average power ratio is extremely high.

[0003] Traditional converters and control methods struggle to decouple pulsed power, which is then transmitted to the AC side via the conversion circuit. Pulsed power disturbances deteriorate converter operating conditions and conversion efficiency, while also causing grid-side current ripples, voltage distortion, and frequency fluctuations, significantly worsening grid-side power quality.

[0004] To achieve pulsed power decoupling, existing solutions can be divided into two categories. The first category involves over-configuring the system's capacitors, inductors, and generator capacity to increase the system's damping effect on pulsed power disturbances, thereby achieving equivalent pulsed power decoupling. The second category involves configuring parallel energy storage nodes in the system and actively compensating for power pulses through auxiliary converters. However, both of these solutions significantly increase the system's cost, size, and complexity. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides a rectified power supply for pulse power decoupling and a control method thereof.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention discloses a rectified power supply for pulse power decoupling, including a controller, and a power factor correction circuit, an input capacitor, a resonant isolation circuit, a buffer capacitor, a voltage correction circuit and an output capacitor connected in sequence. The resonant isolation circuit includes a resonant inverter circuit, the power factor correction circuit is used to connect to an external AC power grid, and the output capacitor is used to connect to an external pulse load. The controller is used to acquire the input three-phase voltage, input three-phase current, and output voltage of the power factor correction circuit in real time, as well as the output voltage of the resonant isolation circuit and the voltage correction circuit. It generates the AC side reference voltage of the power factor correction circuit, the reference switching frequency of the resonant inverter circuit, and the reference duty cycle of the voltage correction circuit. Then, based on the AC side reference voltage of the power factor correction circuit, it generates drive signals for each switching device in the power factor correction circuit and performs corresponding control to balance the input and output power of the rectified power supply. The controller also generates drive signals for each switching device in the resonant isolation circuit based on the reference switching frequency, enabling the resonant isolation circuit to isolate pulse power and stabilize the voltage of the input capacitor. Furthermore, it generates drive signals for each switching device in the voltage correction circuit based on the reference duty cycle to control the voltage stability of the output capacitor.

[0007] Secondly, the present invention also discloses a control method for pulse power decoupling using the rectified power supply, comprising the following steps: 1) The controller collects the input three-phase voltage, input three-phase current and output voltage of the power factor correction circuit in real time, as well as the output voltage of the resonant isolation circuit and the output voltage of the voltage correction circuit; 2) The controller obtains the AC side reference voltage of the power factor correction circuit based on the input three-phase voltage, input three-phase current and output voltage of the power factor correction circuit, as well as the output voltage of the resonant isolation circuit through proportional-integral control; the controller also obtains the reference switching frequency of the resonant inverter circuit based on the output voltage of the power factor correction circuit through proportional-integral control; and the controller obtains the reference duty cycle of the voltage correction circuit based on the output voltage of the voltage correction circuit through proportional-integral control. 3) The controller generates drive signals for each switching device in the power factor correction circuit based on the AC side reference voltage of the power factor correction circuit and performs corresponding control; the controller also generates drive signals for each switching device in the resonant isolation circuit based on the reference switching frequency and performs corresponding control; the controller generates drive signals for each switching device in the voltage correction circuit based on the reference duty cycle and performs corresponding control.

[0008] Further, in step 2), obtaining the AC side reference voltage of the power factor correction circuit includes: First, the output voltage of the resonant isolation circuit is low-pass filtered. Then, based on the low-pass filtered output voltage and the output voltage of the power factor correction circuit, the d-axis current reference value of the AC side of the power factor correction circuit is obtained through proportional-integral control. Then, based on the input three-phase voltage and input three-phase current of the power factor correction circuit, and the d-axis current reference value, the AC side reference voltage of the power factor correction circuit is obtained through proportional-integral control.

[0009] Further, in step 2), obtaining the reference switching frequency of the resonant inverter circuit includes: First, based on the output voltage of the power factor correction circuit and the preset reference value of the output voltage of the power factor correction circuit, a reference voltage gain value for the resonant isolation circuit is generated through proportional-integral control; then, based on the reference voltage gain value, a reference switching frequency for the resonant inverter circuit is obtained through pulse frequency modulation.

[0010] Further, in step 2), the controller generates a reference duty cycle for the voltage correction circuit based on the output voltage of the voltage correction circuit and a preset reference value for the output voltage of the voltage correction circuit through proportional-integral control.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention employs an active control algorithm for resonant isolation circuits to suppress the transmission of pulse power to the AC power grid. This overcomes the shortcomings of existing technologies, such as large size of passive components and large fluctuations in grid-side current amplitude, thereby optimizing the power density and power quality of the rectified power supply. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the component cascade of the rectifier power supply for pulse power decoupling according to the present invention; Figure 2 This is a schematic diagram of the topology of a rectified power supply for pulse power decoupling according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the steps of the rectifier power supply control method for pulse power decoupling according to the present invention; Figure 4 This is a block diagram for calculating the AC side reference voltage of the power factor correction circuit of the present invention. Figure 5 This is a block diagram for calculating the reference switching frequency of the resonant inverter circuit in this invention. Figure 6 This is a block diagram for calculating the reference duty cycle of the voltage correction circuit in this invention. Figure 7 This is a schematic diagram illustrating the pulse power decoupling effect using existing traditional control methods. Figure 8 This is a schematic diagram illustrating the pulse power decoupling effect of the control method described in this invention. Detailed Implementation

[0013] The present invention will be further described and illustrated below with reference to specific embodiments. The embodiments described are merely examples of the content of this disclosure and do not limit the scope of the invention. The technical features of each embodiment in the present invention can be combined accordingly, provided that there is no mutual conflict.

[0014] A rectifier power supply is a circuit that uses power electronic devices to convert electrical energy. A cascaded system is formed by connecting multiple basic circuits and components end to end, and the required conversion function is achieved through communication and cooperation between the main controller and the sub-controllers. The power spectrum of a pulsed load is characterized by intermittency, suddenness, and repetition, and its peak power to average power ratio is extremely high. Pulsed loads have been widely used in production and defense equipment fields, such as electroplating, radar, and data centers.

[0015] Traditional converters and control methods struggle to decouple pulsed power, which is transmitted to the AC side via the conversion circuit. Pulsed power disturbances deteriorate converter operating conditions and conversion efficiency, while also causing grid-side current ripples, voltage distortion, and frequency fluctuations, significantly worsening grid-side power quality. Current technologies attempt to decouple pulsed power by over-configuring energy storage components or introducing auxiliary energy storage converters, which significantly increases system cost, size, and complexity.

[0016] To address the aforementioned problems, this invention proposes a rectified power supply and its control method for pulse power decoupling. This rectified power supply requires no energy storage components and does not require the introduction of an additional energy storage converter.

[0017] like Figure 1 As shown, the cascaded architecture of the rectifier power supply for pulse power decoupling of the present invention includes a power factor correction circuit 1, an input capacitor 2, a resonant isolation circuit 3, a buffer capacitor 4, a voltage correction circuit 5, an output capacitor 6, a first sub-controller 7, a second sub-controller 8, a third sub-controller 9, and a main controller 10.

[0018] The power factor correction circuit 1 includes an AC terminal and a DC terminal. The AC terminal of the power factor correction circuit 1 is connected to an external AC power grid, and the DC terminal is connected to one end of the input capacitor 2. The resonant isolation circuit 3 includes a primary side port and a secondary side port. The other end of the input capacitor 2 is connected to the primary side port of the resonant isolation circuit 3.

[0019] The power factor correction circuit 1 acts as a rectifier, adjusting the input voltage of the AC mains and outputting a suitable voltage to the input capacitor 2. That is, it corrects the power factor on the AC side of the rectified power supply and establishes the voltage across the input capacitor 2 through rectification. The input capacitor 2 serves as the first DC bus of the rectified power supply, providing the input voltage to the resonant isolation circuit 3.

[0020] The secondary side port of the resonant isolation circuit 3 is connected to one end of the buffer capacitor 4. The voltage correction circuit 5 includes a primary side port and a load port. The other end of the buffer capacitor 4 is connected to the primary side port of the voltage correction circuit 5. The load port of the voltage correction circuit 5 is connected to one end of the output capacitor 6, and the other end of the output capacitor 6 is connected to an external pulse load.

[0021] The resonant isolation circuit 3 includes a resonant inverter circuit 31, an isolation impedance circuit 32, and a resonant rectifier circuit 33 connected in sequence. The resonant inverter circuit 31 has an AC terminal and a DC terminal, the isolation impedance circuit 32 has a primary side port and a secondary side port, and the resonant rectifier circuit 33 has an AC terminal and a DC terminal. The circuit connection of the resonant inverter circuit 31, the isolation impedance circuit 32, and the resonant rectifier circuit 33 is as follows: the DC terminal of the resonant inverter circuit 31 is connected to the input capacitor 2; the AC terminal of the resonant inverter circuit 31 is connected to the primary side port of the isolation impedance circuit 32; the secondary side port of the isolation impedance circuit 32 is connected to the AC terminal of the resonant rectifier circuit 33; and the DC terminal of the resonant rectifier circuit 33 is connected to the buffer capacitor 4.

[0022] The resonant inverter circuit 31 is used to invert the DC voltage on the input capacitor 2 into a high-frequency AC voltage and output it to the isolation impedance circuit 32. The isolation impedance circuit 32 includes a resonant inductor. Resonant capacitor and high-frequency transformers, which include magnetizing inductors. The magnetizing inductor can be integrated into a high-frequency transformer via magnetic integration. Resonant inductor. With resonant capacitor Connected in series on the primary side of the high-frequency transformer, the isolation impedance circuit 32 is used to electrically isolate and transform the high-frequency AC voltage, and outputs the transformed high-frequency AC voltage to the resonant rectifier circuit 33. The resonant rectifier circuit 33 is connected between the secondary side of the isolation impedance circuit 32 and the buffer capacitor 4, and is used to rectify the transformed high-frequency AC voltage into DC voltage and inject it into the buffer capacitor 4.

[0023] The resonant isolation circuit 3 provides electrical isolation and voltage ratio regulation for the rectified power supply, and establishes the voltage of the buffer capacitor 4 through isolated DC-DC conversion. The buffer capacitor, as the second DC bus of the rectified power supply, is used to absorb power fluctuations generated by external loads and provide input voltage for the voltage correction circuit 5.

[0024] Voltage correction circuit 5 provides output voltage regulation for the rectifier power supply and establishes the voltage of output capacitor 6 through DC chopping. Output capacitor 6 serves as the third DC bus of the rectifier power supply, providing a stable input voltage for external pulse loads.

[0025] The first sub-controller 7 is connected to the power factor correction circuit 1, the second sub-controller 8 is connected to the resonant isolation circuit 3, and the third sub-controller 9 is connected to the voltage correction circuit 5. The first sub-controller 7 is used to acquire the input three-phase voltage, input three-phase current, and output voltage of the power factor correction circuit in real time and upload them to the main controller 10. The second sub-controller 8 is used to acquire the output voltage of the resonant isolation circuit in real time and upload it to the main controller 10. The third sub-controller 9 is used to acquire the output voltage of the voltage correction circuit in real time and upload it to the main controller 10. The main controller 10 is used to generate the AC side reference voltage of the power factor correction circuit and send it to the first sub-controller 7; it is also used to generate the reference switching frequency of the resonant inverter circuit and send it to the second sub-controller 8; and it is used to generate the reference duty cycle of the voltage correction circuit and send it to the third sub-controller 9.

[0026] The first sub-controller 7 generates drive signals for each switching device in the power factor correction circuit based on the AC side reference voltage of the power factor correction circuit and performs corresponding control to balance the input and output power of the rectified power supply; the second sub-controller 8 generates drive signals for each switching device in the resonant isolation circuit based on the reference switching frequency and performs corresponding control to isolate pulse power in the resonant isolation circuit and stabilize the voltage of the input capacitor; the third sub-controller 9 generates drive signals for each switching device in the voltage correction circuit based on the reference duty cycle and performs corresponding control to stabilize the voltage of the output capacitor.

[0027] The communication structure between the main controller 10 and the first sub-controller 7, the second sub-controller 8 and the third sub-controller 9 is a master-slave structure, and the communication medium is optical fiber.

[0028] Each of the three sub-controllers includes a sampling unit, a driving unit, and a first communication unit. The sampling unit is used to collect data and encode the collected data into digital voltage, current, and other signals, and upload them to the main controller 10. The driving unit is used to receive data sent by the main controller 10 and convert it into driving signals for each switching device in the corresponding circuit. The first communication unit is used to realize digital communication between the sub-controllers and the main controller 10.

[0029] The sub-controller is connected to the power factor correction circuit 1, the resonant isolation circuit 3, and the voltage correction circuit 5 via multiple differential pairs, and the communication medium is electrical wire.

[0030] The main controller 10 includes a second communication unit and an instruction calculation unit; the second communication unit is used to realize digital communication between the main controller 10 and each sub-controller; the instruction calculation unit is used to calculate the AC side reference voltage of the power factor correction circuit, the reference switching frequency of the resonant inverter circuit 31, and the reference duty cycle of the voltage correction circuit 5 based on the signals uploaded by the sub-controllers.

[0031] Figure 2An embodiment of the rectified power supply for pulse power decoupling described in this invention is provided, wherein... For grid-connected inductors, power electronic switching devices -Power electronic switching devices This constitutes a three-phase, two-level, full-bridge power factor correction circuit. This is the supporting capacitor for the first DC bus. As the first DC bus voltage. Power electronic switching devices. -Power electronic switching devices and power diodes -Power diode The switching devices and resonant capacitor required to construct a single-phase full-bridge resonant isolation circuit Magnetizing inductor Resonant inductor The passive components required to form a resonant isolation circuit with the high-frequency transformer constitute the isolation impedance network; This is the supporting capacitor for the second DC bus. As the second DC bus voltage. Power electronic switching devices. , Power diodes This constitutes a Buck-type voltage correction circuit. This is the supporting capacitor for the third DC bus. This serves as the third DC bus voltage.

[0032] Based on the aforementioned rectified power supply for pulse power decoupling, this invention also provides an embodiment of a control method for pulse power decoupling, applied to the rectified power supply, such as... Figure 3 As shown, it includes the following steps: 1) The first sub-controller 7 collects the input three-phase voltage, input three-phase current, and output voltage of the power factor correction circuit in real time and uploads them to the main controller 10. The second sub-controller 8 collects the output voltage of the resonant isolation circuit in real time and uploads it to the main controller 10. The third sub-controller 9 collects the output voltage of the voltage correction circuit in real time and uploads it to the main controller 10.

[0033] 2) The main controller 10 receives signals uploaded by each sub-controller through the second communication unit and stores them in the variable buffer of the main controller 10. Based on all the received signals, the main controller 10 calculates the AC side reference voltage of the power factor correction circuit, the reference switching frequency of the resonant inverter circuit 31, and the reference duty cycle of the voltage correction circuit 5 through the instruction calculation unit. Then, it sends the obtained AC side reference voltage of the power factor correction circuit to the first sub-controller 7, the obtained reference switching frequency to the second sub-controller 8, and the obtained reference duty cycle to the third sub-controller 9 through the second communication unit.

[0034] 3) The first sub-controller 7 receives the AC side reference voltage of the power factor correction circuit through its first communication unit, generates the drive signals of each switching device in the power factor correction circuit, and performs corresponding control to balance the input and output power of the rectified power supply; the second sub-controller 8 receives the reference switching frequency through its first communication unit, generates the drive signals of each switching device in the resonant isolation circuit, and performs corresponding control to isolate the pulse power of the resonant isolation circuit and stabilize the voltage of the input capacitor; the third sub-controller 9 receives the reference duty cycle through its first communication unit, generates the drive signals of each switching device in the voltage correction circuit, and performs corresponding control to stabilize the voltage of the output capacitor.

[0035] The switching between the various states of the rectifier power supply is accomplished by the cooperation of the main controller 10 and the sub-controller. The main controller 10 is responsible for calculating and generating control commands, while the sub-controller is responsible for receiving control commands, generating drives, and uploading circuit status. The main controller 10 and the sub-controller adopt a master-slave communication structure, with optical fiber as the communication medium.

[0036] Furthermore, the calculation method for the AC side reference voltage of the power factor correction circuit is as follows: Figure 4 As shown: First, to reduce voltage disturbances coupled into the voltage loop on the second DC bus, the output voltage of the resonant isolation circuit is low-pass filtered. The filtered output voltage of the resonant isolation circuit can be written in the complex frequency domain as follows: in, This is the output voltage of the resonant isolation circuit after low-pass filtering; This is the cutoff frequency of the first-order filter; Let the variable be a complex variable in Laplace space; This is the output voltage of the resonant isolation circuit.

[0037] Secondly, based on the output voltage of the power factor correction circuit and the output voltage after low-pass filtering, as well as the preset reference values ​​for the output voltage of the resonant isolation circuit and the power factor correction circuit, the d-axis current reference value on the AC side of the power factor correction circuit is generated through proportional-integral control: in, This is the first reference value for the d-axis current on the AC side of the power factor correction circuit; This is the preset reference value for the output voltage of the resonant isolation circuit; This is the closed-loop proportional coefficient of the output voltage of the resonant isolation circuit; The closed-loop integral coefficient of the output voltage of the resonant isolation circuit; This is the second reference value for the d-axis current on the AC side of the power factor correction circuit; This is the output voltage of the power factor correction circuit; The preset power factor correction circuit output voltage reference value; This is the closed-loop proportional coefficient of the output voltage of the power factor correction circuit. This is the closed-loop integral coefficient of the output voltage of the power factor correction circuit.

[0038] Next, based on the d-axis current reference value on the AC side of the power factor correction circuit, as well as the input three-phase voltage and input three-phase current of the power factor correction circuit, a reference voltage on the AC side of the power factor correction circuit is generated through proportional-integral control: in, This is the AC side reference voltage for the power factor correction circuit; The actual value of the AC side d-axis current of the power factor correction circuit is obtained based on the input three-phase voltage and input three-phase current of the power factor correction circuit. This is the current closed-loop proportional coefficient for the power factor correction circuit. This represents the current closed-loop integral coefficient of the power factor correction circuit.

[0039] Finally, the AC side reference voltage of the power factor correction circuit can be sent as a control command to the first sub-controller 7 corresponding to the power factor correction circuit 1.

[0040] Furthermore, the method for calculating the reference switching frequency of the resonant inverter circuit is as follows: Figure 5 As shown: First, to achieve pulse power decoupling, a voltage correction loop for the output voltage of the power factor correction circuit needs to be set up to stabilize its voltage under pulse load. Based on the output voltage of the power factor correction circuit and a preset reference value for the output voltage of the power factor correction circuit, a reference voltage gain value for the resonant isolation circuit is generated through proportional-integral control. in, This is the reference voltage gain value of the resonant isolation circuit, that is, the reference voltage gain from the primary side to the secondary side of the resonant isolation circuit; This refers to the closed-loop proportional coefficient of the voltage gain in the resonant isolation circuit. This represents the closed-loop integral coefficient of the voltage gain of the resonant isolation circuit.

[0041] Secondly, in order to adjust the reference voltage gain value of the resonant isolation circuit, this embodiment uses pulse frequency modulation. For this purpose, it is necessary to generate the reference switching frequency of the resonant inverter circuit under the reference voltage gain value, and the corresponding relationship is as follows: in, This is the ratio of the inductance of the magnetizing inductor to the inductance of the resonant inductor in the resonant isolation circuit. This is the reference switching frequency for the resonant inverter circuit; This is the quality factor of the resonant isolation circuit.

[0042] In particular, and The parameters should be selected based on the control method described in this invention, i.e., preset values. and The selection principle is to ensure that its voltage gain range is within the allowable switching frequency range of the resonant inverter stage, so that the voltage of the second DC bus can be stabilized under the fluctuation of pulse load disturbance.

[0043] Finally, the reference switching frequency of the resonant inverter circuit can be used as a control command to be sent to the second sub-controller 8 corresponding to the resonant isolation circuit 3.

[0044] Furthermore, the method for calculating the reference duty cycle of the voltage correction circuit is as follows: Figure 6 As shown: First, to achieve stable output voltage, a voltage correction loop needs to be set up. Based on the output voltage of the voltage correction circuit and a preset reference value, a reference duty cycle for the voltage correction circuit is generated through proportional-integral control. in, The duty cycle used as a reference for the voltage correction circuit; This is the output voltage of the voltage correction circuit; The preset voltage correction circuit outputs a reference voltage value; This refers to the closed-loop proportional coefficient of the output voltage of the voltage correction circuit. This is the closed-loop integral coefficient of the output voltage of the voltage correction circuit.

[0045] Subsequently, the reference duty cycle of the voltage correction circuit can be sent as a control command to the third sub-controller 9 corresponding to the voltage correction circuit 5.

[0046] Preferably, the control commands for the power factor correction circuit are calculated in the dq stationary coordinate system.

[0047] The effects of implementing this invention can be seen from Figure 6 , Figure 7The comparison clearly shows that the implementation effect of this embodiment is achieved using FPGA real-time simulation circuit and DSP control circuit. The system is defined as a 380V three-phase AC input, rated power of 35kW, output voltage of 800V, and pulse frequency of 30Hz. The implementation effect diagram includes six parts of information: AC side current, voltage, and power of the power factor correction circuit; voltage values ​​of the three DC buses inside the rectifier power supply; current value of the resonant converter circuit; and pulse load power. The process of the invention implementation effect diagram is explained below: When existing traditional control methods are used, the effect is as follows: Figure 7 As shown, the pulsed load power is directly coupled to the resonant isolation circuit current, causing severe fluctuations in the first DC bus voltage. Subsequently, the voltage fluctuations of the first DC bus are coupled to the AC side through the control algorithm of the power factor correction circuit, causing severe fluctuations in the AC side current, severe fluctuations in the AC input power, and distortion of the AC side voltage amplitude.

[0048] When the control method for pulse power decoupling provided by this invention is adopted, the effect is as follows: Figure 8 As shown, the pulsed load power is decoupled at the resonant converter stage, and the peak resonant current remains stable under pulsed power disturbances, thereby ensuring the stability of the first DC bus voltage. Furthermore, the peak current, peak voltage, and power on the AC side of the power factor correction circuit all remain stable. Simultaneously, the control method provided by this invention ensures the balance of the average power required by the system, preventing severe mismatch between output and output power.

[0049] contrast Figure 7 and Figure 8 As can be seen, when the control method provided by this invention is adopted, the AC side current pulse amplitude of the rectifier power supply is small, the AC side voltage distortion is low, and the AC side power fluctuation of the rectifier power supply is small. Therefore, it can reduce the impact with the AC grid when supplying power to the pulse load and realize pulse power decoupling.

[0050] The implementation results demonstrate the effectiveness of the present invention in enabling the normal operation of a rectified power supply for pulse power decoupling and the effectiveness of its control method for power decoupling under pulse power loads.

[0051] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A rectified power supply for pulse power decoupling, characterized in that, It includes a controller, and sequentially connected power factor correction circuit, input capacitor, resonant isolation circuit, buffer capacitor, voltage correction circuit and output capacitor. The resonant isolation circuit includes a resonant inverter circuit. The power factor correction circuit is used to connect to the external AC power grid. The output capacitor is used to connect to the external pulse load. The controller is used to acquire the input three-phase voltage, input three-phase current, and output voltage of the power factor correction circuit in real time, as well as the output voltage of the resonant isolation circuit and the voltage correction circuit. It generates the AC side reference voltage of the power factor correction circuit, the reference switching frequency of the resonant inverter circuit, and the reference duty cycle of the voltage correction circuit. Then, based on the AC side reference voltage of the power factor correction circuit, it generates drive signals for each switching device in the power factor correction circuit and performs corresponding control to balance the input and output power of the rectified power supply. The controller also generates drive signals for each switching device in the resonant isolation circuit based on the reference switching frequency, enabling the resonant isolation circuit to isolate pulse power and stabilize the voltage of the input capacitor. Furthermore, it generates drive signals for each switching device in the voltage correction circuit based on the reference duty cycle to control the voltage stability of the output capacitor.

2. The rectifier power supply according to claim 1, characterized in that, The power factor correction circuit has an AC terminal and a DC terminal, the resonant isolation circuit has a primary side port and a secondary side port, and the voltage correction circuit has a primary side port and a load port. The AC terminal of the power factor correction circuit is connected to the AC power grid, the DC terminal is connected to one end of the input capacitor, the other end of the input capacitor is connected to the primary side port of the resonant isolation circuit, the secondary side port of the resonant isolation circuit is connected to one end of the buffer capacitor, the other end of the buffer capacitor is connected to the primary side port of the voltage correction circuit, the load port of the voltage correction circuit is connected to one end of the output capacitor, and the other end of the output capacitor is connected to the pulse load.

3. The rectifier power supply according to claim 1, characterized in that, The resonant inverter circuit has an AC terminal and a DC terminal; the resonant isolation circuit further includes an isolation impedance circuit and a resonant rectifier circuit. The isolation impedance circuit has a primary side port and a secondary side port, and the resonant rectifier circuit has an AC terminal and a DC terminal. The DC terminal of the resonant inverter circuit is connected to the input capacitor, the AC terminal of the resonant inverter circuit is connected to the primary side port of the isolation impedance circuit, the secondary side port of the isolation impedance circuit is connected to the AC terminal of the resonant rectifier circuit, and the DC terminal of the resonant rectifier circuit is connected to the buffer capacitor.

4. The rectifier power supply according to claim 1, characterized in that, The controller includes a main controller and three sub-controllers; the first sub-controller is used to collect the input three-phase voltage, input three-phase current and output voltage of the power factor correction circuit in real time and upload them to the main controller; the second sub-controller is used to collect the output voltage of the resonant isolation circuit in real time and upload it to the main controller; the third sub-controller is used to collect the output voltage of the voltage correction circuit in real time and upload it to the main controller. The main controller generates the AC side reference voltage of the power factor correction circuit and sends it to the first sub-controller, as well as the reference switching frequency and sends it to the second sub-controller, and the reference duty cycle and sends it to the third sub-controller. The first sub-controller generates drive signals for each switching device in the power factor correction circuit based on the AC side reference voltage of the power factor correction circuit and performs corresponding control; the second sub-controller generates drive signals for each switching device in the resonant isolation circuit based on the reference switching frequency and performs corresponding control; the third sub-controller generates drive signals for each switching device in the voltage correction circuit based on the reference duty cycle and performs corresponding control.

5. A control method for pulse power decoupling using the rectified power supply according to any one of claims 1-4, characterized in that, Includes the following steps: 1) The controller collects the input three-phase voltage, input three-phase current and output voltage of the power factor correction circuit in real time, as well as the output voltage of the resonant isolation circuit and the output voltage of the voltage correction circuit; 2) The controller obtains the AC side reference voltage of the power factor correction circuit based on the input three-phase voltage, input three-phase current and output voltage of the power factor correction circuit, as well as the output voltage of the resonant isolation circuit through proportional-integral control; the controller also obtains the reference switching frequency of the resonant inverter circuit based on the output voltage of the power factor correction circuit through proportional-integral control; and the controller obtains the reference duty cycle of the voltage correction circuit based on the output voltage of the voltage correction circuit through proportional-integral control. 3) The controller generates drive signals for each switching device in the power factor correction circuit based on the AC side reference voltage of the power factor correction circuit and performs corresponding control; the controller also generates drive signals for each switching device in the resonant isolation circuit based on the reference switching frequency and performs corresponding control; the controller generates drive signals for each switching device in the voltage correction circuit based on the reference duty cycle and performs corresponding control.

6. The control method according to claim 5, characterized in that, In step 2), the AC side reference voltage of the power factor correction circuit is obtained, including: First, the output voltage of the resonant isolation circuit is low-pass filtered. Then, based on the low-pass filtered output voltage and the output voltage of the power factor correction circuit, the d-axis current reference value of the AC side of the power factor correction circuit is obtained through proportional-integral control. Then, based on the input three-phase voltage and input three-phase current of the power factor correction circuit, and the d-axis current reference value, the AC side reference voltage of the power factor correction circuit is obtained through proportional-integral control.

7. The control method according to claim 5, characterized in that, In step 2), the reference switching frequency of the resonant inverter circuit is obtained, including: First, based on the output voltage of the power factor correction circuit and the preset reference value of the output voltage of the power factor correction circuit, a reference voltage gain value for the resonant isolation circuit is generated through proportional-integral control; then, based on the reference voltage gain value, a reference switching frequency for the resonant inverter circuit is obtained through pulse frequency modulation.

8. The control method according to claim 5, characterized in that, In step 2), the controller generates a reference duty cycle for the voltage correction circuit based on the output voltage of the voltage correction circuit and the preset reference value of the output voltage of the voltage correction circuit through proportional-integral control.

9. The control method according to claim 5, characterized in that, The resonant isolation circuit includes a magnetizing inductor and a resonant inductor; The formula for calculating the reference switching frequency of the resonant inverter circuit based on the reference voltage gain value through pulse frequency modulation is as follows: ； in, This is the reference switching frequency for the resonant inverter circuit; This is the reference voltage gain value for the resonant isolation circuit; This is the ratio of the inductance of the magnetizing inductor to the inductance of the resonant inductor in the resonant isolation circuit. This is the quality factor of the resonant isolation circuit.

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