A series voltage compensation type pulse power supply and a control method

Abstract

This invention discloses a series voltage-compensated pulse power supply and its control method. The series voltage-compensated pulse power supply consists of four parts: a power converter 1, an isolated bidirectional DC / DC converter, a passive decoupling capacitor C1, and a voltage compensation capacitor C2. The output terminal of the power converter 1 is connected to the pulse power load. Port 1 of the isolated bidirectional DC / DC converter is connected to the passive decoupling capacitor C1, and port 2 is connected to the voltage compensation capacitor C2. Ports 1 and 2 are connected in series and then across the output terminal of the power converter 1. The power converter 1 controls the load voltage and input current, and the isolated bidirectional DC / DC converter controls the voltage of the voltage compensation capacitor C2. This invention can reduce the size and weight of the power supply, increase power density, reduce the number of power conversion stages, and improve power efficiency, without changing the existing power supply system structure, making it suitable for applications supplying power to pulse loads.

Description

Technical Field

[0001] This invention relates to a power supply and control method, specifically to a series voltage-compensated pulse power supply and control method, belonging to the field of power electronic conversion and power supply systems. Background Technology

[0002] Pulse power loads, such as synthetic aperture radar and phased array radar, are becoming increasingly common. These loads require pulse power supplies that can provide stable voltage and pulse current.

[0003] Traditional pulse power supplies achieve power decoupling by stacking a large-capacity capacitor array at the load end of power converter 1 to buffer the load pulse power, with the capacitor array bearing all the pulsating power. Due to the small peak drop requirement of the output voltage within the pulse, the low voltage level, and the high peak-to-average power ratio of the load, the capacity, size, and weight of the decoupling capacitor array are very large, resulting in very low power density of the power supply.

[0004] To address the problems inherent in traditional pulsed power supplies, active power decoupling schemes have been proposed. For example, the literature “X. Huang, X. Ruan, F. Du, F. Liu and L. Zhang, ″A Pulsed Power Supply Adopting Active Capacitor Converter for Low-Voltage and Low-Frequency Pulsed Loads,″in IEEE Transactions on Power Electronics, vol.33, no.11, pp.9219-9230, Nov.2018” proposes a parallel structure. This structure uses a phase-shifted full-bridge converter to provide average power. The low-voltage port of the Buck / Boost bidirectional converter is connected in parallel with the output of the phase-shifted full-bridge converter, and the high-voltage port is connected to a decoupling capacitor to handle pulsating power components. Specifically, during peak load power periods, the decoupling capacitor discharges through the Buck / Boost bidirectional converter to compensate for insufficient power; during off-peak power periods, the excess power from the phase-shifted full-bridge converter charges the decoupling capacitor through the Buck / Boost bidirectional converter. The advantage of this approach is that the decoupling capacitor is not directly connected to the pulse load, allowing for a wider voltage fluctuation range and higher voltage levels. Therefore, the capacitance can be reduced, and the power density of the power supply can be increased. However, in this approach, all pulse power components must undergo three stages of power conversion before reaching the load side, resulting in a large number of power conversion stages and low system efficiency. Summary of the Invention

[0005] The purpose of this invention is to propose a series voltage-compensated pulse power supply and control method to overcome the shortcomings of traditional passive decoupling schemes and existing active decoupling schemes.

[0006] This invention is achieved through the following technical solution:

[0007] A series voltage-compensated pulse power supply includes a power converter 1, an isolated bidirectional DC / DC converter, a passive decoupling capacitor C1, and a voltage compensation capacitor C2.

[0008] Power converter 1 provides the average power required by the load, and the overall structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1 and voltage compensation capacitor C2 provides the pulse power component required by the load.

[0009] The output of power converter 1 is connected to a pulsed power load, which can be achieved in two ways:

[0010] Method 1: Implemented using a single-stage converter, which can be an isolated or non-isolated AC / DC converter or an isolated or non-isolated DC / DC converter.

[0011] Method 2: Implemented using a two-stage converter, where the front stage can be an isolated or non-isolated AC / DC converter or an isolated or non-isolated DC / DC converter, and the rear stage can be an isolated or non-isolated DC / DC converter.

[0012] Port 1 of the isolated bidirectional DC / DC converter is connected to the passive decoupling capacitor C1, and port 2 is connected to the voltage compensation capacitor C2. After port 1 and port 2 are connected in series, the overall structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected to power converter 1 in two ways:

[0013] Method a: When power converter 1 is implemented using methods 1 and 2, the entire assembly consisting of the isolation bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected across the output terminal of power converter 1.

[0014] Method b: When power converter 1 is implemented using method 2, the entire assembly consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected across the DC bus of power converter 1.

[0015] There are two ways to implement an isolated bidirectional DC / DC converter:

[0016] Method α: A single-stage isolated bidirectional DC / DC converter is used. Port 1 of the single-stage isolated bidirectional DC / DC converter is connected to a passive decoupling capacitor C1, and port 2 is connected to a voltage compensation capacitor C2.

[0017] Method β: A front-stage isolated bidirectional DC / DC converter is cascaded with a rear-stage non-isolated bidirectional DC / DC converter. One port of the front-stage isolated bidirectional DC / DC converter is connected to a passive decoupling capacitor C1, and one port of the rear-stage non-isolated bidirectional DC / DC converter is connected to a voltage compensation capacitor C2. The other port of the front-stage isolated bidirectional DC / DC converter is connected to the other port of the rear-stage non-isolated bidirectional DC / DC converter.

[0018] The passive decoupling capacitor C1 is used for power decoupling. It needs to be designed according to the peak power of the load and voltage fluctuation. The capacitance value is relatively large, and the voltage fluctuation range of the capacitor is also large.

[0019] Voltage compensation capacitor C2 is used to compensate for voltage fluctuations in passive decoupling capacitor C1. It is designed according to the voltage ripple of the switching frequency and has a relatively small capacitance value. Its fluctuation range is the same as that of passive decoupling capacitor C1, but the fluctuation direction is opposite.

[0020] The power required by the load is processed by power converter 1 and then reaches the load without needing to undergo any other power conversion.

[0021] Power converter 1 controls the load terminal voltage, DC bus voltage, and input current, and isolates the bidirectional DC / DC converter control voltage compensation capacitor C2 voltage:

[0022] For power converter 1, two control methods are used depending on its implementation. The control process is described below:

[0023] a. When power converter 1 is implemented using method 1, the connection between the isolated bidirectional DC / DC converter, the passive decoupling capacitor C1, and the voltage compensation capacitor C2, and the single-stage converter can only be in method a; the voltage signal v at the load end of the single-stage converter... o and input current i in Sampling, voltage reference signal V or With v o The error signal v is obtained after subtraction. oe The error signal is adjusted by voltage regulator 1 to obtain the input current reference signal i. inr i inr with i in The current loop error signal i is obtained after subtraction. ine The signal passes through current regulator 1 and pulse modulator to obtain the drive signal of single-stage converter, thereby regulating the load voltage and input current.

[0024] b. When power converter 1 is implemented using method 2, the integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected to power converter 1 using methods a and b; the front-stage converter control bus voltage v busand input current i in The subsequent converter controls the load-side voltage v. o ; Regarding the bus voltage v bus and input current i in Sampling, bus voltage reference signal V busr With v bus The error signal v is obtained after subtraction. buse The error signal is adjusted by voltage regulator 2 to obtain the input current reference signal i. inr i inr with i in The current loop error signal i is obtained after subtraction. ine The signal, after passing through current regulator 2 and pulse modulator, becomes the drive signal for the pre-converter, thereby regulating its bus voltage and input current; and for the load voltage signal v o Sampling, voltage reference signal v or With v o The error signal v is obtained after subtraction. oe The error signal is adjusted by voltage regulator 3 to obtain the drive signal of the subsequent converter, thereby adjusting the load voltage.

[0025] If the isolated bidirectional DC / DC converter is implemented using method α, its control method is described as follows:

[0026] For the passive decoupling capacitor voltage v o1 Real-time sampling, v o1 With bus voltage reference signal V busr (The integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 is connected to power converter 1 via connection method a) or voltage reference signal V or (The integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 is connected to power converter 1 via connection method b.) The voltage reference signal V of the voltage compensation capacitor is obtained by subtracting the voltage from the integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2. o2r V o2r Real-time sampling signal v of voltage compensation capacitor voltage o2 The error signal v is obtained by subtraction. o2e v o2e After being regulated by voltage regulator 4, the drive signal for the isolated bidirectional DC / DC converter is obtained, thereby regulating the voltage across the voltage compensation capacitor.

[0027] If the isolated bidirectional DC / DC converter is implemented using mode β, the front-stage isolated bidirectional DC / DC converter is only used to achieve electrical isolation and can be controlled in an open-loop manner to operate at its highest efficiency. The control method for the subsequent non-isolated bidirectional DC / DC converter is the same as that for the isolated bidirectional DC / DC converter in mode α.

[0028] The present invention has the following beneficial effects:

[0029] (1) By adopting the system structure of the present invention, due to the voltage compensation effect of the voltage compensation capacitor, the voltage of the passive decoupling capacitor can fluctuate significantly, the required capacitor capacity can be greatly reduced, the power supply volume and weight can be reduced, and the power supply power density can be increased.

[0030] (2) With the system structure of the present invention, the power required by the load only needs to be processed by the power converter 1, and the power efficiency is high.

[0031] (3) The system structure of the present invention only requires the replacement of the passive capacitor, without modifying the traditional pulse power supply system structure;

[0032] (4) By adopting the control scheme of the power converter 1 described in this invention, the load voltage can be stabilized and the input current ripple can be suppressed. Attached Figure Description

[0033] The accompanying drawings and embodiments of the present invention are used together to explain the present invention and to provide a further understanding of the present invention, but do not constitute a limitation thereof;

[0034] First, let's explain the meaning of the symbols in the attached diagram: V in v o1 v o2 v o v bus These are the input voltage of power converter 1, the voltage of the main decoupling capacitor, the voltage of the voltage compensation capacitor, the load-side voltage of power converter 1, and the bus voltage of power converter 1, respectively; i in and i o V represents the input current and load current of power converter 1; or V busr v o2r i inr These are the load-side voltage reference signal, bus voltage reference signal, voltage compensation capacitor voltage reference signal, and input current reference signal, respectively; V xr Indicates the load-side voltage reference signal V or (When the isolation bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 are connected to power converter 1 in mode a) or bus voltage reference signal V busr (When the isolation bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 are connected to power converter 1 in mode b); V o1av The average voltage of the passive decoupling capacitor; v oe v buse v o2e i ineThese are the error signals obtained by subtracting the load-side voltage, bus voltage, voltage compensation capacitor voltage, and input-side current from their respective reference signals; C1, C2, C r These are, respectively, the passive decoupling capacitor, the voltage compensation capacitor, and the resonant capacitor of the LLC resonant converter; C b To isolate the bidirectional DC / DC converter, mode β is used to implement the intermediate bus capacitor between the front-stage isolated bidirectional DC / DC converter and the rear-stage non-isolated bidirectional DC / DC converter; S1, S2, S3, S4, S x1 S x2 S x3 S x4 S x5 S x6 S x7 S x8 S y1 S y2 S y3 and S y4 D1 and D2 are switching transistors; L is a diode. pr L r L m L f1 and L f2 T1 and T2 are inductors;

[0035] Appendix Figure 1 This is a schematic diagram of the series voltage-compensated pulse power supply structure of the present invention;

[0036] Appendix Figure 2 The diagram shows the structure of the power converter 1 in the series voltage-compensated pulse power supply of the present invention, which is implemented in mode 1. The overall structure consisting of the isolation bidirectional DC / DC converter, the passive decoupling capacitor C1 and the voltage compensation capacitor C2 is connected to the power converter 1 in mode a.

[0037] Appendix Figure 3 The diagram shows the structure of the power converter 1 in the series voltage-compensated pulse power supply of the present invention, which is implemented in mode 2. The overall structure consisting of the isolation bidirectional DC / DC converter, the passive decoupling capacitor C1 and the voltage compensation capacitor C2 is connected to the power converter 1 in mode a.

[0038] Appendix Figure 4 The power converter 1 in the series voltage-compensated pulse power supply of the present invention is implemented in mode 2. The overall structure consisting of the isolation bidirectional DC / DC converter, the passive decoupling capacitor C1 and the voltage compensation capacitor C2 is connected to the power converter 1 in mode b.

[0039] Appendix Figure 5 This is a schematic diagram of the isolated bidirectional DC / DC converter of the series voltage-compensated pulse power supply of the present invention, implemented in method α.

[0040] Appendix Figure 6a , 6b 6c is a schematic diagram of the isolated bidirectional DC / DC converter of the series voltage-compensated pulse power supply of the present invention using the implementation method β, and an example of the subsequent non-isolated bidirectional converter implementation circuit;

[0041] Appendix Figure 7 This is a control block diagram of a single-stage converter when the power converter 1 of the series voltage compensated pulse power supply of the present invention is implemented in mode 1;

[0042] Appendix Figure 8 This is a control block diagram of the front-stage converter and the rear-stage converter when the power converter 1 of the series voltage-compensated pulse power supply of the present invention is implemented in mode 2;

[0043] Appendix Figure 9 This is a control block diagram of the isolated bidirectional DC / DC converter of the series voltage-compensated pulse power supply of the present invention;

[0044] Appendix Figure 10 This is a circuit diagram of a specific embodiment of the series voltage-compensated pulse power supply of the present invention;

[0045] Appendix Figure 11 The waveforms of the load terminal voltage, passive decoupling capacitor voltage, voltage compensation capacitor voltage, and load current are shown in a specific embodiment of the series voltage compensation pulse power supply of the present invention. Detailed Implementation

[0046] To make the objectives, embodiments, and advantages of this invention clear, the invention will be described in detail below with reference to the accompanying drawings. The following description is for illustrative purposes only and does not limit the scope of the invention.

[0047] The series voltage-compensated pulse power supply structure described in this invention is shown in the attached figure. Figure 1 As shown, the pulse power supply consists of a power converter 1, an isolated bidirectional DC / DC converter, a passive decoupling capacitor C1, and a voltage compensation capacitor C2.

[0048] Power converter 1 can be implemented in two ways:

[0049] Method 1: Implemented using a single-stage converter. In specific implementation, isolated or non-isolated AC / DC converters or isolated or non-isolated DC / DC converters can be used.

[0050] Method 2: Implemented using a two-stage converter. In specific implementation, the front stage can be an isolated or non-isolated AC / DC converter or an isolated or non-isolated DC / DC converter, and the rear stage can be an isolated or non-isolated DC / DC converter.

[0051] Port 1 of the isolated bidirectional DC / DC converter is connected to the passive decoupling capacitor C1, and port 2 is connected to the voltage compensation capacitor C2. After port 1 and port 2 are connected in series, the overall configuration consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected to power converter 1 in the following two ways:

[0052] Method a: When power converter 1 is implemented using methods 1 and 2, the entire assembly consisting of the isolation bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected across the output terminal of power converter 1.

[0053] Method b: When power converter 1 is implemented using method 2, the entire assembly consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected across the DC bus of power converter 1.

[0054] When power converter 1 adopts implementation mode 1, the entire assembly consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can only be connected to power converter 1 in mode a. The power supply structure diagram is shown below. Figure 2 As shown;

[0055] When power converter 1 adopts implementation mode 2, the integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected to power converter 1 in modes a and b, respectively, as shown in the power supply structure diagrams. Figure 3 and 4 As shown;

[0056] An isolated bidirectional DC / DC converter can be implemented in two ways.

[0057] Method α: A single-stage isolated bidirectional DC / DC converter is used. Port 1 of the single-stage isolated bidirectional DC / DC converter is connected to a passive decoupling capacitor C1, and port 2 is connected to a voltage compensation capacitor C2, as shown below. Figure 5 As shown; in specific implementation, a dual active bridge converter or a bidirectional LLC resonant converter can be used;

[0058] Method β: A front-stage isolated bidirectional DC / DC converter is cascaded with a rear-stage non-isolated bidirectional DC / DC converter. Port 1 of the front-stage isolated bidirectional DC / DC converter is connected to a passive decoupling capacitor C1, and port 2 of the rear-stage non-isolated bidirectional DC / DC converter is connected to a voltage compensation capacitor C2. The other port of the front-stage isolated bidirectional DC / DC converter is connected to the other port of the rear-stage non-isolated bidirectional DC / DC converter, as shown below. Figure 6aAs shown; in specific implementation, the front-stage isolated bidirectional DC / DC converter can be an open-loop controlled bidirectional LLC resonant converter, while the rear-stage non-isolated bidirectional DC / DC converter needs to determine its specific topology based on the voltage range of the voltage compensation capacitor. For example, when the voltage compensation capacitor fluctuates within the positive and negative voltage range, the non-isolated bidirectional DC / DC converter can use a four-quadrant switching converter, such as... Figure 6b As shown, when the voltage compensation capacitor continuously fluctuates within the positive voltage range, a Buck / Boost bidirectional DC / DC converter can be used as a non-isolated bidirectional DC / DC converter, such as... Figure 6c As shown;

[0059] In the pulse power supply described in this invention, the power converter 1 controls the load terminal voltage v. o DC bus voltage v bus and input current i in Isolation bidirectional DC / DC converter control voltage compensation capacitor voltage v o2 ;

[0060] The specific control method for power converter 1 is as follows:

[0061] Adopting such Figure 2 The power supply structure shown represents the voltage signal v at the load terminal of a single-stage converter. o and input current i in Sampling, voltage reference signal V or With v o The error signal v is obtained after subtraction. oe The error signal is adjusted by voltage regulator 1 to obtain the input current reference signal i. inr i inr with i in The current loop error signal i is obtained after subtraction. ine The signal, after passing through current regulator 1 and pulse modulator, becomes the drive signal for the single-stage converter, thereby regulating the load voltage and input current; the control block diagram is as follows. Figure 7 As shown;

[0062] Adopting such Figure 3 Or the power supply structure shown in Figure 4; the front-end converter controls the bus voltage v bus and input current i in The subsequent converter controls the load-side voltage v. o ; Regarding the bus voltage v bus and input current i in Sampling, bus voltage reference signal V busr With v bus The error signal v is obtained after subtraction. buse The error signal is adjusted by voltage regulator 2 to obtain the input current reference signal i. inr i inr with iin The current loop error signal i is obtained after subtraction. ine The signal, after passing through current regulator 2 and pulse modulator, becomes the drive signal for the pre-converter, thereby regulating its bus voltage and input current; and for the load voltage signal v o Sampling, voltage reference signal v or With v o The error signal v is obtained after subtraction. oe The error signal is regulated by voltage regulator 3 to obtain the drive signal for the subsequent converter, thereby regulating the load voltage; the corresponding control block diagram is as follows. Figure 8 As shown;

[0063] Isolated bidirectional DC / DC converter adopts Figure 5 The implementation method is described as follows:

[0064] For passive decoupling capacitor v o1 and voltage compensation capacitor voltage v o2 Sampling, v o1 With V xr (use Figure 4 When connected in this way, it is V. busr ,use Figure 3 When connected in this way, it is V. or The voltage reference value of the voltage compensation capacitor is obtained by subtracting the voltage. o2r v o2r With v o2 The error signal v is obtained by subtraction. o2e v o2e After being regulated by voltage regulator 4, the drive signal for the isolated bidirectional DC / DC converter is obtained, thereby adjusting the voltage across the voltage compensation capacitor; the corresponding control block diagram is as follows. Figure 9 As shown;

[0065] Isolated bidirectional DC / DC converter adopts Figure 6a The implementation method involves using open-loop control for the front-stage isolated bidirectional DC / DC converter to ensure it always operates at its highest efficiency. The control block diagram for the rear-stage non-isolated bidirectional DC / DC converter is shown below. Figure 9 As shown;

[0066] In a specific embodiment of the present invention, for example Figure 10 As shown, power converter 1 is implemented using a phase-shifted full-bridge converter, the isolated bidirectional DC / DC converter uses a bidirectional LLC resonant converter, and the non-isolated bidirectional converter uses... Figure 6b The diagram shows a four-quadrant switching converter. The output voltage v is stabilized by adjusting the phase shift angle of switches S1 and S4 relative to S2 and S3. o and input current i in By adjusting the switching transistor S y1 Sy2 S y3 and S y4 The duty cycle is used to control the voltage V of the voltage compensation capacitor. o2 ;

[0067] The key waveform corresponding to this embodiment is as follows: Figure 11 As shown, the load terminal voltages v are, in order. o Passive decoupling capacitor voltage v o1 Voltage compensation capacitor voltage v o2 Load current i o When the load current is at its lowest point, the excess energy output by the phase-shifted full-bridge converter charges the passive capacitor, causing v to... o1 Increase, and adjust v through a four-quadrant converter. o2 When the load current decreases and reaches its peak, the passive capacitor discharges to compensate for the insufficient energy of the phase-shifted full-bridge converter, thus reducing v. o1 Decrease, by adjusting v through a four-quadrant transformer o2 This increases the load-side voltage, thereby keeping it essentially constant throughout the entire operating cycle.

[0068] The outstanding innovation and progress of this invention compared with traditional and existing pulse power decoupling schemes lies in the following: the creative use of a passive decoupling capacitor and a voltage compensation capacitor connected in series, which allows the passive decoupling capacitor to fluctuate significantly, effectively reducing the amount of capacitor used, increasing the power density of the system, and the power required by the load only flows into the load after being processed by the power converter 1. Compared with existing active power decoupling schemes, the power efficiency is improved.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various improvements and modifications can be made without fundamentally departing from the principles of the present invention, and all such improvements and modifications should be considered within the scope of protection of the present invention.

Claims

1. A series voltage-compensated pulse power supply, comprising a power converter 1, an isolated bidirectional DC / DC converter, a passive decoupling capacitor C1, and a voltage compensation capacitor C2, characterized in that, include: The power converter 1 provides the average power required by the load, and the overall structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1 and voltage compensation capacitor C2 provides the pulse power component required by the load. The output of power converter 1 is connected to a pulsed power load, which can be achieved in two ways: Method 1: Implemented using a single-stage converter, which can be an isolated or non-isolated AC / DC converter or an isolated or non-isolated DC / DC converter. Method 2: Implemented using a two-stage converter, where the front stage can be an isolated or non-isolated AC / DC converter or an isolated or non-isolated DC / DC converter, and the rear stage can be an isolated or non-isolated DC / DC converter. Port 1 of the isolated bidirectional DC / DC converter is connected to the passive decoupling capacitor C1, and port 2 is connected to the voltage compensation capacitor C2. After port 1 and port 2 are connected in series, the overall structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected to power converter 1 in two ways: Method a: When power converter 1 is implemented using methods 1 and 2, the entire assembly consisting of the isolation bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected across the output terminal of power converter 1. Method b: When power converter 1 is implemented using method 2, the entire assembly consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected across the DC bus of power converter 1. There are two ways to implement an isolated bidirectional DC / DC converter: Method α: A single-stage isolated bidirectional DC / DC converter is used. Port 1 of the single-stage isolated bidirectional DC / DC converter is connected to a passive decoupling capacitor C1, and port 2 is connected to a voltage compensation capacitor C2. Method β: A front-stage isolated bidirectional DC / DC converter is cascaded with a rear-stage non-isolated bidirectional DC / DC converter. One port of the front-stage isolated bidirectional DC / DC converter is connected to a passive decoupling capacitor C1, and one port of the rear-stage non-isolated bidirectional DC / DC converter is connected to a voltage compensation capacitor C2. The other port of the front-stage isolated bidirectional DC / DC converter is connected to the other port of the rear-stage non-isolated bidirectional DC / DC converter. The passive decoupling capacitor C1 is used for power decoupling. It needs to be designed according to the peak power of the load and voltage fluctuation. The capacitance value is relatively large, and the voltage fluctuation range of the capacitor is also large. Voltage compensation capacitor C2 is used to compensate for voltage fluctuations in passive decoupling capacitor C1. It is designed according to the voltage ripple of the switching frequency and has a relatively small capacitance value. Its fluctuation range is the same as that of passive decoupling capacitor C1, but the fluctuation direction is opposite. The power required by the load is processed by power converter 1 and then reaches the load without needing to go through other power conversions.

2. The control method for the series voltage-compensated pulse power supply according to claim 1, characterized in that, Power converter 1 controls the load terminal voltage, DC bus voltage, and input current, and isolates the bidirectional DC / DC converter control voltage compensation capacitor C2 voltage: For power converter 1, two control methods are used depending on its implementation. The control process is described below: a. When power converter 1 is implemented using method 1, the connection between the isolated bidirectional DC / DC converter, the passive decoupling capacitor C1, and the voltage compensation capacitor C2, and the single-stage converter can only be in method a; the voltage signal v at the load end of the single-stage converter... o and input current i in Sampling, voltage reference signal V or With v o The error signal v is obtained after subtraction. oe The error signal is adjusted by voltage regulator 1 to obtain the input current reference signal i. inr i inr with i in The current loop error signal i is obtained after subtraction. ine The signal passes through current regulator 1 and pulse modulator to obtain the drive signal of single-stage converter, thereby regulating the load voltage and input current. b. When power converter 1 is implemented using method 2, the integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 can be connected to power converter 1 using methods a and b; the front-stage converter control bus voltage v bus and input current i in The subsequent converter controls the load-side voltage v. o ; Regarding the bus voltage v bus and input current i in Sampling, bus voltage reference signal V busr With v bus The error signal v is obtained after subtraction. buse The error signal is adjusted by voltage regulator 2 to obtain the input current reference signal i. inr i inr with i in The current loop error signal i is obtained after subtraction. ine The signal, after passing through current regulator 2 and pulse modulator, becomes the drive signal for the pre-converter, thereby regulating its bus voltage and input current; and for the load voltage signal v o Sampling, voltage reference signal v or With v o The error signal v is obtained after subtraction. oe The error signal is regulated by voltage regulator 3 to obtain the drive signal of the subsequent converter, thereby regulating the load voltage. If the isolated bidirectional DC / DC converter is implemented using method α, its control method is described as follows: For the passive decoupling capacitor voltage v o1 Real-time sampling, v o1 With bus voltage reference signal V busr (The integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 is connected to power converter 1 via connection method a) or voltage reference signal V or (The integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2 is connected to power converter 1 via connection method b.) The voltage reference signal V of the voltage compensation capacitor is obtained by subtracting the voltage from the integrated structure consisting of the isolated bidirectional DC / DC converter, passive decoupling capacitor C1, and voltage compensation capacitor C2. o2r V o2r Real-time sampling signal v of voltage compensation capacitor voltage o2 The error signal V is obtained by subtraction. o2e v o2e After being regulated by voltage regulator 4, the drive signal for the isolated bidirectional DC / DC converter is obtained, thereby regulating the voltage across the voltage compensation capacitor. If the isolated bidirectional DC / DC converter is implemented using mode β, the front-stage isolated bidirectional DC / DC converter is only used to achieve electrical isolation and can be controlled in an open-loop manner to operate at its highest efficiency. The control method for the subsequent non-isolated bidirectional DC / DC converter is the same as that for the isolated bidirectional DC / DC converter in mode α.

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