A high-power pulse power supply control system and control method

Abstract

The present invention relates to a high-power pulse power supply control system and control method, belonging to the field of high-power power supply and control technology, and solves the problems in the prior art that power supply products are heavy and bulky, and the charging and discharging method affects the service life. The circuit includes: an AC-DC converter, connected between the power input and the power output; used to output a pulse power supply according to the power input; a control circuit, which controls the working state of the bidirectional DC-DC converter according to the acquired charging and discharging voltage / current in the system and the set charging and discharging voltage / current reference, and outputs a control instruction to automatically control the charging and discharging current of the bidirectional DC-DC converter according to the acquired charging and discharging voltage / current in the system and the set charging and discharging voltage / current reference, as well as the working state of the bidirectional DC-DC converter; the bidirectional DC-DC converter is connected in series between the AC-DC converter and the capacitor component C3. The weight and volume of the power supply product are reduced and the high-power pulse power supply is effectively controlled.

Description

Technical Field

[0001] The present invention relates to the field of high-power power supply and control technology, and in particular to a high-power pulse power supply control system and control method. Background Art

[0002] With the development of the defense industry, pulse power supplies have been increasingly used, especially in the aerospace field. The widespread use of phased array radars has put forward new requirements for their primary side pulse power supplies. Usually, such pulse power supplies are three-phase three-wire AC inputs, and the output voltage levels are usually 352Vdc, 550Vdc or 720Vdc. The output pulse power is usually three times the rated output power. Figure 1 As shown in FIG, conventional pulse power supplies all adopt the method of increasing energy storage capacitors to "cut the peak and fill the valley" of pulse power.

[0003] For example, a typical phased array radar pulse power supply requirement has the following indicators: input voltage: 380×(1±10%)Vac, three-phase three-wire, 50Hz; average power: 10kW; pulse power: 30kW (period 10ms, pulse width 3ms); output rated voltage: 352Vdc (voltage fluctuation within the pulse power is no more than 352±3%V). For this type of power supply, an AC-DC converter with a rated power of 10 to 15kW is usually used to provide the average power output. For a pulse power of 30kW, a method of connecting capacitor components in parallel on the output side is used to meet the indicator requirement of voltage fluctuation within the pulse power being no more than 352±3%V. If the rated power of the AC-DC converter is 15kW, the energy required by the capacitor components within the pulse power is:

[0004] E C =(P 脉冲 -P AC-DC )×t 脉冲 =(30×10 3 -15×10 3 )×4×10 -3 =60(J)

[0005] If the output voltage is allowed to drop to 342V within the pulse power (meeting the voltage fluctuation requirement of no more than 352±3%V), the capacitance required at the output end is:

[0006]

[0007] If an electrolytic capacitor is chosen as the energy storage capacitor, the capacity of a single capacitor is 330uF, the withstand voltage is 400Vdc, and the size is 35mm in diameter × 30mm in height. To meet the above capacity requirements, 53 such capacitors need to be connected in parallel, and the space required is approximately 1947.75cm 3Furthermore, in existing methods where AC-DC converters are directly connected to capacitors, the capacitors passively follow the operating mode of the downstream load, frequently charging and discharging. These high charging and discharging currents significantly impact the lifespan of the capacitors. This existing connection method significantly increases the weight and volume of the power supply, significantly impacting its service life.

[0008] Therefore, the prior art lacks a high-power pulse power supply control system and control method that can effectively reduce the weight and volume of existing power supply products and increase the service life of the products, and has high practical value in this field. Summary of the Invention

[0009] In view of the above analysis, the embodiments of the present invention aim to provide a high-power pulse power supply control system and control method to solve the impractical problems of existing power supply products, such as large weight and volume, and the serious impact of charging and discharging methods on the service life of power supply products as the number of electrolytic capacitors increases.

[0010] In one aspect, an embodiment of the present invention provides a high-power pulse power supply control system, comprising:

[0011] An AC-DC converter connected between a power input and a power output; configured to output a pulsed power supply according to the power input;

[0012] a control circuit that controls the operating state of the bidirectional DC-DC converter based on the acquired charge and discharge voltage / current in the system and a set charge and discharge voltage / current reference, and outputs a control instruction to automatically control the charge and discharge current of the bidirectional DC-DC converter based on the acquired charge and discharge voltage / current in the system and the set charge and discharge voltage / current reference, as well as the operating state of the bidirectional DC-DC converter;

[0013] The bidirectional DC-DC converter is connected in series between the AC-DC converter and the capacitor component C3.

[0014] Furthermore, the charge and discharge voltage / current references set include: boost voltage reference V Discharge , charge and discharge judgment threshold V C / D , discharge current reference I discharge , Buck Regulator Voltage Reference V Charge and charging current reference I charge ;

[0015] The charge and discharge judgment threshold V C / D =Boost voltage reference V Discharge +1V;

[0016] The charging and discharging voltage / current includes: the discharge voltage sampling signal u at the output end of the AC-DC convertero , the discharge current sampling signal i between the bidirectional DC-DC converter and the AC-DC converter output positive terminal discharge , the charging voltage sampling signal u across the capacitor component C3 c , the charging current sampling signal i between the positive bidirectional DC-DC converter and the capacitor component C3 charge , the drain-source current sampling signal i of the MOS tube Q1 in the bidirectional DC-DC converter q1 and the current sampling signal i of the drain-source of the MOS tube Q2 in the bidirectional DC-DC converter q2 .

[0017] Furthermore, the bidirectional DC-DC converter includes: MOS tubes Q1-Q2, capacitors C1-C2 and inductor L1;

[0018] The two ends of the capacitor C1 are connected to the output end of the AC-DC converter as the output / input ends of the bidirectional DC-DC converter;

[0019] The two ends of the capacitor C2 are connected to the capacitor component as input / output ends of the bidirectional DC-DC converter;

[0020] The gates of the MOS transistors Q1 and Q2 are connected to the second control output terminal and the first control output terminal of the control circuit, respectively. The drain of the MOS transistor Q1 is connected to the positive output terminal of the AC-DC converter. The source of the MOS transistor Q1 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the capacitor C2. The other end of the capacitor C2 is connected to the negative output terminal of the AC-DC converter. The drain of the MOS transistor Q2 is connected to the source of the MOS transistor Q1. The source of the MOS transistor Q2 is connected to the negative output terminal of the AC-DC converter. One end of the capacitor C1 is connected to the positive output terminal of the AC-DC converter, and the other end is connected to the negative output terminal of the AC-DC converter.

[0021] Furthermore, the control circuit includes: a first control circuit, a second control circuit and a third control circuit;

[0022] The third control circuit samples the discharge voltage signal u o and the charge and discharge judgment threshold V C / D Control the operating mode of the bidirectional DC-DC converter to realize the charging and discharging of the capacitor component C3:

[0023] When the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When the third control circuit controls the bidirectional DC-DC converter to operate in the BOOST discharge mode;

[0024] When the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D When the third control circuit controls the bidirectional DC-DC converter to operate in the BUCK charging mode;

[0025] The first control circuit is based on the boost voltage reference V Discharge , the discharge voltage sampling signal u at the output of the AC-DC converter o , discharge current sampling signal i discharge , discharge current reference I discharge and the current sampling signal i of the drain-source of MOS tube Q2 q2 , and together with the third control circuit, performs discharge voltage control and discharge current regulation of the circuit to realize discharge current control of the bidirectional DC-DC converter;

[0026] The second control circuit is based on the step-down voltage reference V Charge , charging voltage sampling signal u c , charging current sampling signal i charge , charging current reference I charge and the drain-source current sampling signal i of the MOS tube Q1 q1 , and together with the third control circuit, perform charging voltage control and charging current regulation of the circuit to achieve bidirectional DC-DC converter charging current control.

[0027] Furthermore, the first control circuit includes: subtractors SUB1-SUB2, PI regulators REG1-REG2, a minimum circuit MIN1, a comparator COMP1, a trigger RS1 and a clock CLOCK1;

[0028] The negative input terminal of the subtractor SUB1 inputs the discharge voltage sampling signal u o The positive input of the subtractor SUB1 inputs the boost voltage reference V Discharge The output end of the subtractor SUB1 is connected to the input end of the PI regulator REG1; the output end of the PI regulator REG1 is connected to the first input end of the small circuit MIN1; the subtractor SUB1 and the PI regulator REG1 form a discharge voltage closed loop;

[0029] The negative input terminal of the subtractor SUB2 inputs the discharge current sampling signal i discharge The positive input terminal of the subtractor SUB2 inputs the discharge current reference I dischargeThe output end of the subtractor SUB2 is connected to the input end of the PI regulator REG2; the output end of the PI regulator REG2 is connected to the second input end of the small circuit MIN1; the subtractor SUB2 and the PI regulator REG2 form a discharge current closed loop;

[0030] The minimum circuit MIN1 takes the minimum value of the two PI regulator output signals and sends it to the negative input terminal of the comparator COMP1; the positive input terminal of the comparator COMP1 inputs the current sampling signal i of the drain-source of the MOS tube Q2. q2 The output end of the comparator COMP1 is connected to the R port of the trigger RS1; the clock CLOCK1 is connected to the S port of the trigger RS1 for providing a clock signal to the trigger RS1.

[0031] Furthermore, the second control circuit includes: subtractors SUB3-SUB4, PI regulators REG3-REG4, a minimum circuit MIN2, a comparator COMP2, a trigger RS2 and a clock signal CLOCK2;

[0032] The negative input terminal of the subtractor SUB3 inputs the charging voltage sampling signal u c The positive input terminal of the subtractor SUB3 inputs the step-down voltage reference V Charge The output end of the subtractor SUB3 is connected to the input end of the PI regulator REG3; the output end of the PI regulator REG3 is connected to the first input end of the small circuit MIN2; the subtractor SUB3 and the PI regulator REG3 form a charging voltage closed loop;

[0033] The negative input terminal of the subtractor SUB4 inputs the charging current sampling signal i charge The positive input terminal of the subtractor SUB4 inputs the charging current reference I charge The output end of the subtractor SUB4 is connected to the input end of the PI regulator REG4; the output end of the PI regulator REG4 is connected to the second input end of the minimization circuit MIN2; the subtractor SUB4 and the PI regulator REG4 form a charging current closed loop;

[0034] The minimum circuit MIN2 takes the minimum value of the two PI regulator signals input and outputs it to the negative input terminal of the comparator COMP2; the positive input terminal of the comparator COMP2 inputs the drain-source current sampling signal i of the MOS tube Q1. q1 The output end of the comparator COMP2 is connected to the R port of the trigger RS2; the clock CLOCK2 is connected to the S port of the trigger RS2, and is used to provide a clock signal for the trigger RS2.

[0035] Furthermore, the third control circuit includes: a comparator COMP3, a NOT gate OR1, an AND gate AND1 and an AND gate AND2;

[0036] The negative input terminal of the comparator COMP3 serves as the negative input terminal of the third control circuit;

[0037] The positive input terminal of the comparator COMP3 serves as the positive input terminal of the third control circuit;

[0038] The first input terminal of the AND gate AND1 serves as the first input terminal of the third control circuit;

[0039] The first input terminal of the AND gate AND2 serves as the second input terminal of the third control circuit;

[0040] The negative input terminal of the comparator COMP3 inputs the discharge voltage sampling signal u o The positive input terminal of the comparator COMP3 inputs the charge and discharge judgment threshold V C / D The output terminal of the comparator COMP3 is connected to the second input terminal of the AND gate AND1; the first input terminal of the AND gate AND1 is connected to the output terminal of the trigger RS1; the AND gate AND1 outputs the driving signal of the MOS transistor Q2 as the first control output terminal to realize the modulation of the MOS transistor Q2;

[0041] The output end of the comparator COMP3 is also connected to the input end of the NOT gate OR1; the output end of the NOT gate OR1 is connected to the second input end of the AND gate AND2; the first input end of the AND gate AND2 is connected to the output end of the trigger RS2; the AND gate AND2 serves as a second control output end to output the drive signal of the MOS transistor Q1, thereby realizing modulation of the MOS transistor Q1.

[0042] On the other hand, an embodiment of the present invention provides a high-power pulse power supply control method, including:

[0043] Set the charge and discharge voltage / current benchmark;

[0044] Obtain the charging and discharging voltage / current in the system;

[0045] Controlling the operating state of the bidirectional DC-DC converter according to the obtained set charge and discharge voltage / current reference and the charge and discharge voltage / current in the system; and controlling the charge and discharge voltage and current of the bidirectional DC-DC converter according to the set charge and discharge voltage / current reference and the obtained charge and discharge voltage / current in the system, as well as the operating state of the bidirectional DC-DC converter;

[0046] The AC-DC converter is connected between the power input and the power output and is used to output pulse power according to the power input; the bidirectional DC-DC converter is connected in series between the AC-DC converter and the capacitor component C3.

[0047] Furthermore, the charge and discharge voltage / current references set include: boost voltage reference V Discharge , charge and discharge judgment threshold V C / D , discharge current reference I discharge , Buck Regulator Voltage Reference V Charge and charging current reference I charge ; The charge and discharge judgment threshold V C / D =Boost voltage reference V Discharge +1V;

[0048] The charging and discharging voltage / current includes: the discharge voltage sampling signal u at the output end of the AC-DC converter o , the discharge current sampling signal i between the bidirectional DC-DC converter and the AC-DC converter output positive terminal discharge , the charging voltage sampling signal u across the capacitor component C3 c , the charging current sampling signal i between the bidirectional DC-DC converter and the positive electrode of the capacitor component charge , the drain-source current sampling signal i of the MOS tube Q1 in the bidirectional DC-DC converter q1 and the current sampling signal i of the drain-source of the MOS tube Q2 in the bidirectional DC-DC converter q2 .

[0049] Furthermore, when the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When the bidirectional DC-DC converter operates in the BOOST discharge mode; according to the boost voltage reference V Discharge , discharge voltage sampling signal u o , discharge current sampling signal i discharge , discharge current reference I discharge and the current sampling signal i of the drain-source of MOS tube Q2 q2 , perform discharge voltage control and discharge current regulation of the circuit to achieve current control of circuit discharge;

[0050] When the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D When the bidirectional DC-DC converter operates in the BUCK charging mode; according to the step-down voltage reference V Charge , charging voltage sampling signal u c , charging current sampling signal icharge , charging current reference I charge and the drain-source current sampling signal i of the MOS tube Q1 q1 , to control the charging voltage and adjust the charging current of the circuit, and realize the current control of the circuit charging.

[0051] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0052] 1. Add a bidirectional DC-DC converter between the output of the traditional pulse power supply and the capacitor component, so that within the pulse power, the capacitor component can produce a larger voltage drop, thereby releasing more energy;

[0053] 2. When the pulse power is off, the bidirectional DC-DC converter can charge the capacitor voltage to the voltage value before discharge, effectively utilizing the power;

[0054] 3. Through reasonable control strategy, realize the automatic switching between charging and discharging of bidirectional DC-DC converter, so that the pulse power supply can meet the requirements of both average power output and pulse power output;

[0055] 4. The pulse power supply and control method of the present application can effectively reduce the weight and volume of existing power supply products and increase the service life of the products, and has high practical value in this field.

[0056] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0058] Figure 1 This is a schematic diagram of a conventional high-power pulse power supply;

[0059] Figure 2 This is a schematic diagram of the structure of a high-power pulse power supply control system shown in one embodiment of the present application;

[0060] Figure 3 This is a connection diagram of a high-power pulse power supply control system shown in one embodiment of the present application;

[0061] Figure 4 This is a schematic diagram of the control circuit connection of a high-power pulse power supply control system shown in one embodiment of the present application;

[0062] Figure 5 This is a schematic diagram of the working mode of a high-power pulse power supply control system when the output load is in average power output mode according to an embodiment of the present application;

[0063] Figure 6 This is a schematic diagram of the working mode of a high-power pulse power supply control system with an output load within the pulse power according to an embodiment of the present application;

[0064] Figure 7 This is a schematic diagram of the working mode of a high-power pulse power supply control system with an output load outside the pulse power shown in an embodiment of the present application;

[0065] Figure 8 This is a flow chart of a high-power pulse power supply control method shown in another embodiment of the present application. DETAILED DESCRIPTION

[0066] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0067] like Figure 2 As shown, a specific embodiment of the present invention discloses a high-power pulse power supply control system, including:

[0068] AC-DC converter 10, connected between the power input and the power output; used to output pulse power according to the power input;

[0069] The control circuit 20 controls the operating state of the bidirectional DC-DC converter 30 based on the acquired charge and discharge voltage / current in the system and the set charge and discharge voltage / current reference, and outputs control instructions to automatically control the charge and discharge current of the bidirectional DC-DC converter 30 based on the acquired charge and discharge voltage / current in the system and the set charge and discharge voltage / current reference, as well as the operating state of the bidirectional DC-DC converter 30;

[0070] The bidirectional DC-DC converter 30 is connected in series between the AC-DC converter 10 and the capacitor component 40 ( C3 ).

[0071] Specifically, the charge and discharge voltage / current references set include: boost voltage reference V Discharge , charge and discharge judgment threshold V C / D , discharge current reference I discharge , Buck Regulator Voltage Reference V Charge and charging current reference I charge ; The charge and discharge judgment threshold V C / D =Boost voltage reference VDischarge +1V;

[0072] like Figure 3 As shown, the charge and discharge voltage / current includes: the discharge voltage sampling signal u at the output end of the AC-DC converter o , the discharge current sampling signal i between the bidirectional DC-DC converter and the AC-DC converter output positive terminal discharge , the charging voltage sampling signal u across the capacitor component C3 c , the charging current sampling signal i between the bidirectional DC-DC converter and the positive electrode of the capacitor component charge , the drain-source current sampling signal i of MOS tube Q1 q1 and the drain-source current sampling signal i of MOS tube Q2 q2 .

[0073] Specifically, if Figure 3 As shown, the bidirectional DC-DC converter 30 includes: MOS transistors Q1-Q2, capacitors C1-C2 and inductor L1;

[0074] The two ends of the capacitor C1 are connected to the output end of the AC-DC converter 10 as the output / input ends of the bidirectional DC-DC converter 30;

[0075] The two ends of the capacitor C2 are connected to the capacitor component 40 (C3) as the input / output ends of the bidirectional DC-DC converter 30;

[0076] The gates of the MOS transistors Q1 and Q2 are connected to the second control output terminal and the first control output terminal of the control circuit 20, respectively. The drain of the MOS transistor Q1 is connected to the positive output terminal of the AC-DC converter 10. The source of the MOS transistor Q1 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the capacitor C2. The other end of the capacitor C2 is connected to the negative output terminal of the AC-DC converter 10. The drain of the MOS transistor Q2 is connected to the source of the MOS transistor Q1. The source of the MOS transistor Q2 is connected to the negative output terminal of the AC-DC converter 10. One end of the capacitor C1 is connected to the positive output terminal of the AC-DC converter 10, and the other end is connected to the negative output terminal of the AC-DC converter 10.

[0077] In the present invention, the energy storage capacitor component added to the output side of a conventional pulse power supply is replaced by a combination of a bidirectional DC-DC converter 30 + a capacitor component 40 (C3). Through the control of the control circuit 20, when the output power is within the pulse power, the voltage across the capacitor component 40 (C3) is converted by the added bidirectional DC-DC converter 30 to provide partial pulse power output for the pulse power supply; when the output power is outside the pulse power, the capacitor component 40 (C3) is charged by the added bidirectional DC-DC converter 30, so that the voltage across the capacitor component 40 (C3) can reach the designed predetermined value when the next pulse arrives.

[0078] Specifically, if Figure 4 As shown, the control circuit 20 includes: a first control circuit, a second control circuit and a third control circuit;

[0079] The third control circuit includes first and second input terminals, a positive input terminal and a negative input terminal; the third control circuit samples the discharge voltage according to the discharge voltage sampling signal u o and the charge and discharge judgment threshold V C / D Control the operating mode of the bidirectional DC-DC converter 30 to realize the charging and discharging of the capacitor component 40 (C3):

[0080] When the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When the third control circuit controls the bidirectional DC-DC converter 30 to operate in the BOOST discharge mode; the first control circuit controls the bidirectional DC-DC converter 30 to operate in the BOOST discharge mode according to the boost voltage reference V Discharge , the discharge voltage sampling signal u at the output of the AC-DC converter o , discharge current sampling signal i discharge , discharge current reference I discharge and the current sampling signal i of the drain-source of MOS tube Q2 q2 , jointly performing discharge voltage control and discharge current regulation of the circuit with the third control circuit, thereby realizing discharge current control of the circuit when the bidirectional DC-DC converter is in a discharge state; the third control circuit modulates the MOS transistor Q2 according to input data from the positive input terminal, the negative input terminal, and the first input terminal; the output terminal of the first control circuit is connected to the first input terminal;

[0081] When the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D When the third control circuit controls the bidirectional DC-DC converter 30 to operate in the BUCK charging mode; the second control circuit controls the bidirectional DC-DC converter 30 to operate in the BUCK charging mode according to the step-down voltage reference V Charge , charging voltage sampling signal uc , charging current sampling signal i charge , charging current reference I charge and the drain-source current sampling signal i of the MOS tube Q1 q1 , jointly performing charging voltage control and charging current regulation of the circuit with the third control circuit, thereby realizing charging current control of the circuit when the bidirectional DC-DC converter is in a charging state; the third control circuit modulates the MOS transistor Q1 according to input data from the positive input terminal, the negative input terminal, and the second input terminal; the output terminal of the second control circuit is connected to the second input terminal.

[0082] The bidirectional DC-DC converter 30 adopts a BOOST / BUCK topology and charges and discharges the capacitor component 40 (C3) by controlling the gate drive signals of MOS transistors Q1 and Q2. When the third control circuit controls the bidirectional DC-DC converter 30 to operate in the BOOST discharge mode, the first control circuit controls the discharge voltage and adjusts the discharge current of the circuit based on the charge and discharge voltage / current reference and the collected charge and discharge voltage / current from the system, thereby achieving peak current control when the bidirectional DC-DC converter is in the discharge state. When the third control circuit controls the bidirectional DC-DC converter 30 to operate in the BUCK charging mode, the second control circuit controls the charge voltage and adjusts the charge current of the circuit based on the charge and discharge voltage / current reference and the collected charge and discharge voltage / current from the system, thereby achieving peak current control when the bidirectional DC-DC converter is in the charging state. This operating mode can effectively solve the problem of slow charging startup when the initial voltage of the capacitor component 40 (C3) is zero.

[0083] Specifically, the first control circuit includes: subtractors SUB1-SUB2, PI regulators REG1-REG2, a minimum circuit MIN1, a comparator COMP1, a trigger RS1 and a clock CLOCK1;

[0084] More specifically, the negative input terminal of the subtractor SUB1 inputs the discharge voltage sampling signal u at the output terminal of the AC-DC converter 10. o The positive input of the subtractor SUB1 is used to set the boost voltage reference V Discharge The output end of the subtractor SUB1 is connected to the input end of the PI regulator REG1; the output end of the PI regulator REG1 is connected to the first input end of the small circuit MIN1; the subtractor SUB1 and the PI regulator REG1 form a bidirectional DC-DC converter 30 discharge voltage closed loop;

[0085] The negative input terminal of the subtractor SUB2 inputs the discharge current sampling signal i between the positive output terminal of the AC-DC converter 10 and the bidirectional DC-DC converter 30. discharge The positive input terminal of the subtractor SUB2 is used to input the discharge current reference I discharge The output end of the subtractor SUB2 is connected to the input end of the PI regulator REG2; the output end of the PI regulator REG2 is connected to the second input end of the small circuit MIN1; the subtractor SUB2 and the PI regulator REG2 form a bidirectional DC-DC converter 30 discharge current closed loop;

[0086] The minimum circuit MIN1 takes the minimum value of the two PI regulator output signals and sends it to the negative input terminal of the comparator COMP1; the positive input terminal of the comparator COMP1 inputs the current sampling signal i of the drain-source of the MOS tube Q2. q2 The output of the comparator COMP1 is connected to the R port of the trigger RS1; the clock CLOCK1 is connected to the S port of the trigger RS1 to provide a clock signal for the trigger RS1; and the output of the trigger RS1 is connected to the second input of the AND gate AND1 in the third control circuit. More specifically, the minimization circuit MIN1 can minimize the output signals of the discharge voltage loop and the discharge current loop and send them to the comparator COMP1 for comparison with the current sampling signal of the MOS transistor (Q2). The minimization circuit MIN1 then works together with the trigger RS1 and the clock CLOCK1 to achieve peak current control when the bidirectional DC-DC converter is in the discharge state.

[0087] Specifically, the second control circuit includes: subtractors SUB3-SUB4, PI regulators REG3-REG4, a minimum circuit MIN2, a comparator COMP2, a trigger RS2 and CLOCK2;

[0088] The negative input terminal of the subtractor SUB3 inputs the charging voltage sampling signal u of the capacitor component 30 (C3) c The positive input of the subtractor SUB3 is input to set the step-down voltage reference value V Charge The output end of the subtractor SUB3 is connected to the input end of the PI regulator REG3; the output end of the PI regulator REG3 is connected to the first input end of the small circuit MIN2; the subtractor SUB3 and the PI regulator REG3 form a bidirectional DC-DC converter 30 charging voltage closed loop;

[0089] The negative input terminal of the subtractor SUB4 inputs the charging current sampling signal i between the positive electrode of the capacitor component 40 (C3) and the bidirectional DC-DC converter 30. chargeThe positive input terminal of the subtractor SUB4 is used to input the charging current reference I charge The output end of the subtractor SUB4 is connected to the input end of the PI regulator REG4; the output end of the PI regulator REG4 is connected to the second input end of the minimization circuit MIN2; the subtractor SUB4 and the PI regulator REG4 form a bidirectional DC-DC converter 30 charging current closed loop;

[0090] The minimum circuit MIN2 takes the minimum value of the two PI regulator signals input and outputs it to the negative input terminal of the comparator COMP2; the positive input terminal of the comparator COMP2 inputs the drain-source current sampling signal i of the MOS tube Q1. q1 The output end of the comparator COMP2 is connected to the R port of the trigger RS2; the clock CLOCK2 is connected to the S port of the trigger RS2 and is used to provide a clock signal for the trigger RS2; the output end of the trigger RS2 is connected to the second input end of the AND gate AND2 in the third control circuit; more specifically, the min-max circuit MIN2 can min-max the output signals of the voltage loop and the current loop and send them to the comparator COMP2 for comparison with the current sampling signal of the MOS tube (Q1), and then work together with the trigger RS2 and the clock CLOCK2 to complete the peak current control function of the circuit when the bidirectional DC-DC converter is in the charging state.

[0091] Specifically, the third control circuit includes:

[0092] Comparator COMP3, NOT gate OR1, AND gate AND1 and AND gate AND2;

[0093] The negative input terminal of the comparator COMP3 serves as the negative input terminal of the third control circuit;

[0094] The positive input terminal of the comparator COMP3 serves as the positive input terminal of the third control circuit;

[0095] The first input terminal of the AND gate AND1 serves as the first input terminal of the third control circuit;

[0096] The first input terminal of the AND gate AND2 serves as the second input terminal of the third control circuit;

[0097] The negative input terminal of the comparator COMP3 inputs the discharge voltage sampling signal u at the output terminal of the AC-DC converter 10. o The positive input terminal of the comparator COMP3 inputs the charge and discharge judgment threshold V C / DThe output terminal of the comparator COMP3 is connected to the second input terminal of the AND gate AND1; the output terminal of the comparator COMP3 is also connected to the input terminal of the NOT gate OR1; the output terminal of the NOT gate OR1 is connected to the second input terminal of the AND gate AND2; the charge and discharge judgment threshold V C / D =Boost voltage reference V Discharge +1V;

[0098] More specifically, when the discharge voltage sampling signal u is detected o Greater than the charge and discharge judgment threshold V C / D After that, the comparator COMP3 outputs a low level, realizing the modulation function of the MOS transistor Q1 and the blocking function of the MOS transistor Q2, and the bidirectional DC-DC converter 30 works in the charging state; the AND gate AND1 serves as the first control output terminal to output the driving signal of the MOS transistor Q2;

[0099] When the discharge voltage sampling signal u is detected o Less than the charge and discharge judgment threshold V C / D After that, the comparator COMP3 outputs a high level, and the AND gate AND2 serves as the second control output terminal to output the driving signal of the MOS transistor Q1, thereby achieving the modulation of the MOS transistor Q2 and the blocking function of the MOS transistor Q1, and the bidirectional DC-DC converter 30 is in the working and discharging state.

[0100] Specifically, Figure 5-7 Take this as an example to explain the working mode of the high-power pulse power supply control system:

[0101] exist Figure 1 On the basis of the above, a bidirectional DC-DC converter 30 with a rated power of 15kW is added to realize the charge and discharge control of the capacitor component 40 (C3) during the working process. Figure 2-3 As shown;

[0102] Use the original Figure 1 The AC-DC converter in the SET 352Vdc, rated power 15kW, constant current output after overpower, output voltage decreases as power increases;

[0103] Set the boost voltage regulation value of the bidirectional DC-DC converter 30: To ensure that the entire power of the power supply device is borne by the AC-DC converter 10 under the average power of 10kW, the boost voltage regulation value of the bidirectional DC-DC converter 30 should be slightly lower than the output voltage V SET Optionally, in this embodiment, the voltage value V Discharge 350Vdc;

[0104] Setting the buck regulation value of the bidirectional DC-DC converter 30: Since the bidirectional DC-DC converter 30 is in the BUCK working mode during the charging phase, the maximum duty cycle is usually limited to within 95%. Therefore, the upper limit voltage of the selected buck regulation value should be less than 352V×95%=334.4V. Optionally, in this embodiment, the buck regulation value V Charge 332V;

[0105] Taking into account the conversion efficiency of the bidirectional DC-DC converter 30, the capacity of the capacitor component 40 (C3), and other factors, the lower limit voltage V of the bidirectional DC-DC converter 30 is determined. C_L It is one-fourth of the step-down voltage regulation value of the bidirectional DC-DC converter 30. Optionally, according to the selected step-down voltage regulation value, the charging lower limit voltage V C_L 83V;

[0106] Based on the above parameters, the capacity of the capacitor component 40 (C3) can be determined. The energy required to be output by the bidirectional DC-DC converter 30 and the capacitor component 40 (C3) during the pulse time is:

[0107] E C =(P 脉冲 -P AC-DC )×t 脉冲 =(30×10 3 -15×10 3 )×4×10 -3 =60(J)

[0108] The capacitor component 40 (C3) is discharged through the bidirectional DC-DC converter 30 to provide energy for the load, and the voltage across the two ends is V Charge Fall to V C_L , ignoring the effect of conversion efficiency, the required capacitance component 40 (C3) is:

[0109]

[0110] More specifically, the operating mode of the high-power pulse power supply control system designed according to the above parameters is:

[0111] (1) Figure 5 As shown, when the output load is in average power output mode, that is, the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D , the AC-DC converter 10 works normally. At this time, the charging voltage sampling signal u of the capacitor component 30 (C3) c Equal to the set buck regulator voltage reference V Charge , the bidirectional DC-DC converter 30 does not output power to the outside;

[0112] (2) Figure 6 As shown, the output load is in pulse power output mode. When in pulse power, the AC-DC converter 10 has entered a constant current state due to overpower use, and its output voltage begins to decrease. When the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When , the AC-DC converter 10 operates at a constant current, and the bidirectional DC-DC converter 30 is in a BOOST discharge mode, extracting energy from both ends of the capacitor component 40 (C3) and providing it to the power output, and the voltage across both ends of the capacitor component 40 (C3) gradually decreases;

[0113] (3) Figure 7 As shown, the output load is in pulse power output mode. When it is out of pulse power, the AC-DC converter 10 exits the constant current state and its output voltage returns to V SET , discharge voltage sampling signal u o will be greater than the charge and discharge judgment threshold V C / D , the AC-DC converter 10 works in a voltage-stabilized manner, and the charging voltage sampling signal u of the capacitor component 30 (C3) c Less than the set step-down voltage reference V Charge The bidirectional DC-DC converter 30 is in the BUCK charging mode and extracts energy from the power output to charge the capacitor component 40 (C3). The voltage across the capacitor component 40 (C3) gradually increases.

[0114] It can be seen from the above specific design cases that the high-power pulse power supply control system designed by this embodiment can effectively reduce the capacity of the output energy storage capacitor required by the pulse power supply, and reduce the weight and volume of the power supply device; at the same time, this capacitor component 40 (C3) is selected as a thin film capacitor, for example, a single film capacitor with a capacity of 100uF, a withstand voltage of 500Vdc, and a size of 57.5mm in length × 50mm in height × 35mm in width. Twelve thin film capacitors are connected in parallel, and the required space size is only 1207.5cm3, so that the pulse power supply can greatly improve the service life while reducing the volume and weight.

[0115] like Figure 8 As shown, a specific embodiment of the present invention discloses a high-power pulse power supply control method, including:

[0116] S10, setting the charge and discharge voltage / current reference;

[0117] S20, obtaining the charge and discharge voltage / current in the system;

[0118] S30, controlling the operating state of the bidirectional DC-DC converter according to the set charge and discharge voltage / current reference and the acquired charge and discharge voltage / current in the system, and controlling the charge and discharge voltage and charge and discharge current of the bidirectional DC-DC converter according to the set charge and discharge voltage / current reference and the acquired charge and discharge voltage / current in the system and the operating state of the bidirectional DC-DC converter;

[0119] The AC-DC converter is connected between the power input and the power output and is used to output pulse power according to the power input; the bidirectional DC-DC converter is connected in series between the AC-DC converter and the capacitor component C3.

[0120] Specifically, the charge and discharge voltage / current references set include: boost voltage reference V Discharge , charge and discharge judgment threshold V C / D , discharge current reference I discharge , Buck Regulator Voltage Reference V Charge and charging current reference I charge ; The charge and discharge judgment threshold V C / D =Boost voltage reference V Discharge +1V;

[0121] The charging and discharging voltage / current includes: the discharge voltage sampling signal u at the output end of the AC-DC converter o , the discharge current sampling signal i between the bidirectional DC-DC converter and the AC-DC converter output positive terminal discharge , the charging voltage sampling signal u across the capacitor component C3 c , the charging current sampling signal i between the bidirectional DC-DC converter and the positive electrode of the capacitor component charge 、The drain-source current sampling signal i of the MOS tube Q1 in the bidirectional DC-DC converter q1 and the drain-source current sampling signal i of the MOS tube Q2 in the bidirectional DC-DC converter q2 .

[0122] Specifically, when the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When the bidirectional DC-DC converter operates in the BOOST discharge mode; according to the boost voltage reference V Discharge , discharge voltage sampling signal u o , discharge current sampling signal i discharge , discharge current reference I discharge and the current sampling signal i of the drain-source of MOS tube Q2 q2 , to control the discharge voltage and discharge current of the circuit, and realize the peak current control of the circuit discharge;

[0123] When the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D When the bidirectional DC-DC converter operates in the BUCK charging mode; according to the step-down voltage reference V Charge , charging voltage sampling signal u c , charging current sampling signal i charge , charging current reference I charge and the drain-source current sampling signal i of the MOS tube Q1 q1 , to control the charging voltage and charging current of the circuit, and realize the peak current control of the circuit charging.

[0124] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A high-power pulse power supply control system, characterized in that: include: AC-DC converter, connected between the power input and power output; Used to output pulse power according to the power input; a control circuit that controls the operating state of the bidirectional DC-DC converter based on the acquired charge and discharge voltage / current in the system and a set charge and discharge voltage / current reference, and outputs a control instruction to automatically control the charge and discharge current of the bidirectional DC-DC converter based on the acquired charge and discharge voltage / current in the system and the set charge and discharge voltage / current reference, as well as the operating state of the bidirectional DC-DC converter; The bidirectional DC-DC converter is connected in series between the AC-DC converter and the capacitor component C3; The bidirectional DC-DC converter includes: MOS transistor Q1, MOS transistor Q2, capacitor C1, capacitor C2 and inductor L1; The control circuit includes: a first control circuit, a second control circuit and a third control circuit; The third control circuit samples the discharge voltage signal u o and the charge and discharge judgment threshold V C / D Control the operating mode of the bidirectional DC-DC converter to realize the charging and discharging of the capacitor component C3: When the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When the third control circuit controls the bidirectional DC-DC converter to operate in the BOOST discharge mode; When the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D When the third control circuit controls the bidirectional DC-DC converter to operate in the BUCK charging mode; The first control circuit is based on the boost voltage reference V Discharge , the discharge voltage sampling signal u at the output of the AC-DC converter o , discharge current sampling signal i discharge , discharge current reference I discharge and the current sampling signal i of the drain-source of MOS tube Q2 q2 , and together with the third control circuit, performs discharge voltage control and discharge current regulation of the circuit to realize discharge current control of the bidirectional DC-DC converter; The second control circuit is based on the step-down voltage reference V Charge , charging voltage sampling signal u c , charging current sampling signal i charge , charging current reference I charge and the drain-source current sampling signal i of the MOS tube Q1 q1 , and together with the third control circuit, perform charging voltage control and charging current regulation of the circuit to achieve bidirectional DC-DC converter charging current control.

2. The high-power pulse power supply control system according to claim 1, characterized in that: The charge and discharge voltage / current references set include: boost voltage reference V Discharge , charge and discharge judgment threshold V C / D , discharge current reference I discharge , Buck Regulator Voltage Reference V Charge and charging current reference I charge ; The charge and discharge judgment threshold V C / D =Boost voltage reference V Discharge +1V; The charging and discharging voltage / current includes: the discharge voltage sampling signal u at the output end of the AC-DC converter o , the discharge current sampling signal i between the bidirectional DC-DC converter and the AC-DC converter output positive terminal discharge , the charging voltage sampling signal u across the capacitor component C3 c , the charging current sampling signal i between the positive bidirectional DC-DC converter and the capacitor component C3 charge , the drain-source current sampling signal i of the MOS tube Q1 in the bidirectional DC-DC converter q1 and the current sampling signal i of the drain-source of the MOS tube Q2 in the bidirectional DC-DC converter q2 .

3. The high-power pulse power supply control system according to claim 1, characterized in that: The two ends of the capacitor C1 are connected to the output end of the AC-DC converter as the output / input ends of the bidirectional DC-DC converter; The two ends of the capacitor C2 are connected to the capacitor component as input / output ends of the bidirectional DC-DC converter; The gates of the MOS transistors Q1 and Q2 are connected to the second control output terminal and the first control output terminal of the control circuit, respectively. The drain of the MOS transistor Q1 is connected to the positive output terminal of the AC-DC converter. The source of the MOS transistor Q1 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the capacitor C2. The other end of the capacitor C2 is connected to the negative output terminal of the AC-DC converter. The drain of the MOS transistor Q2 is connected to the source of the MOS transistor Q1. The source of the MOS transistor Q2 is connected to the negative output terminal of the AC-DC converter. One end of the capacitor C1 is connected to the positive output terminal of the AC-DC converter, and the other end is connected to the negative output terminal of the AC-DC converter.

4. The high-power pulse power supply control system according to claim 3, characterized in that: The first control circuit includes: a subtractor SUB1, a subtractor SUB2, a PI regulator REG1, a PI regulator REG2, a minimum circuit MIN1, a comparator COMP1, a trigger RS1 and a clock CLOCK1; The negative input terminal of the subtractor SUB1 inputs the discharge voltage sampling signal u o The positive input of the subtractor SUB1 inputs the boost voltage reference V Discharge The output end of the subtractor SUB1 is connected to the input end of the PI regulator REG1; the output end of the PI regulator REG1 is connected to the first input end of the small circuit MIN1; the subtractor SUB1 and the PI regulator REG1 form a discharge voltage closed loop; The negative input terminal of the subtractor SUB2 inputs the discharge current sampling signal i discharge The positive input terminal of the subtractor SUB2 inputs the discharge current reference I discharge The output end of the subtractor SUB2 is connected to the input end of the PI regulator REG2; the output end of the PI regulator REG2 is connected to the second input end of the small circuit MIN1; the subtractor SUB2 and the PI regulator REG2 form a discharge current closed loop; The minimum circuit MIN1 takes the minimum value of the two PI regulator output signals and sends it to the negative input terminal of the comparator COMP1; the positive input terminal of the comparator COMP1 inputs the current sampling signal i of the drain-source of the MOS tube Q2. q2 The output end of the comparator COMP1 is connected to the R port of the trigger RS1; the clock CLOCK1 is connected to the S port of the trigger RS1 for providing a clock signal to the trigger RS1.

5. The high-power pulse power supply control system according to claim 4, characterized in that: The second control circuit includes: a subtractor SUB3, a subtractor SUB4, a PI regulator REG3, a PI regulator REG4, a minimum circuit MIN2, a comparator COMP2, a trigger RS2 and a clock signal CLOCK2; The negative input terminal of the subtractor SUB3 inputs the charging voltage sampling signal u c The positive input terminal of the subtractor SUB3 inputs the step-down voltage reference V Charge The output end of the subtractor SUB3 is connected to the input end of the PI regulator REG3; the output end of the PI regulator REG3 is connected to the first input end of the small circuit MIN2; the subtractor SUB3 and the PI regulator REG3 form a charging voltage closed loop; The negative input terminal of the subtractor SUB4 inputs the charging current sampling signal i charge The positive input terminal of the subtractor SUB4 inputs the charging current reference I charge The output end of the subtractor SUB4 is connected to the input end of the PI regulator REG4; the output end of the PI regulator REG4 is connected to the second input end of the minimization circuit MIN2; the subtractor SUB4 and the PI regulator REG4 form a charging current closed loop; The minimum circuit MIN2 takes the minimum value of the two PI regulator signals input and outputs it to the negative input terminal of the comparator COMP2; the positive input terminal of the comparator COMP2 inputs the drain-source current sampling signal i of the MOS tube Q1. q1 The output end of the comparator COMP2 is connected to the R port of the trigger RS2; the clock CLOCK2 is connected to the S port of the trigger RS2, and is used to provide a clock signal for the trigger RS2.

6. The high-power pulse power supply control system according to claim 5, characterized in that: The third control circuit includes: a comparator COMP3, a NOT gate OR1, an AND gate AND1 and an AND gate AND2; The negative input terminal of the comparator COMP3 serves as the negative input terminal of the third control circuit; The positive input terminal of the comparator COMP3 serves as the positive input terminal of the third control circuit; The first input terminal of the AND gate AND1 serves as the first input terminal of the third control circuit; The first input terminal of the AND gate AND2 serves as the second input terminal of the third control circuit; The negative input terminal of the comparator COMP3 inputs the discharge voltage sampling signal u o The positive input terminal of the comparator COMP3 inputs the charge and discharge judgment threshold V C / D The output terminal of the comparator COMP3 is connected to the second input terminal of the AND gate AND1; the first input terminal of the AND gate AND1 is connected to the output terminal of the trigger RS1; the AND gate AND1 outputs the driving signal of the MOS transistor Q2 as the first control output terminal to realize the modulation of the MOS transistor Q2; The output end of the comparator COMP3 is also connected to the input end of the NOT gate OR1; the output end of the NOT gate OR1 is connected to the second input end of the AND gate AND2; the first input end of the AND gate AND2 is connected to the output end of the trigger RS2; the AND gate AND2 serves as a second control output end to output the drive signal of the MOS transistor Q1, thereby realizing modulation of the MOS transistor Q1.

7. A control method for a high-power pulse power supply control system according to any one of claims 1 to 6, characterized in that: include: Set the charge and discharge voltage / current benchmark; Obtain the charging and discharging voltage / current in the system; Controlling the operating state of the bidirectional DC-DC converter according to the obtained set charge and discharge voltage / current reference and the charge and discharge voltage / current in the system; and controlling the charge and discharge voltage and current of the bidirectional DC-DC converter according to the set charge and discharge voltage / current reference and the obtained charge and discharge voltage / current in the system, as well as the operating state of the bidirectional DC-DC converter; The AC-DC converter is connected between the power input and the power output and is used to output pulse power according to the power input; the bidirectional DC-DC converter is connected in series between the AC-DC converter and the capacitor component C3.

8. The control method according to claim 7, characterized in that: The charge and discharge voltage / current references set include: boost voltage reference V Discharge , charge and discharge judgment threshold V C / D , discharge current reference I discharge , Buck Regulator Voltage Reference V Charge and charging current reference I charge ; The charge and discharge judgment threshold V C / D =Boost voltage reference V Discharge +1V; The charging and discharging voltage / current includes: the discharge voltage sampling signal u at the output end of the AC-DC converter o , the discharge current sampling signal i between the bidirectional DC-DC converter and the AC-DC converter output positive terminal discharge , the charging voltage sampling signal u across the capacitor component C3 c , the charging current sampling signal i between the bidirectional DC-DC converter and the positive electrode of the capacitor component charge , the drain-source current sampling signal i of the MOS tube Q1 in the bidirectional DC-DC converter q1 and the current sampling signal i of the drain-source of the MOS tube Q2 in the bidirectional DC-DC converter q2 .

9. The control method according to claim 8, characterized in that: When the discharge voltage sampling signal u o Less than the charge and discharge judgment threshold V C / D When the bidirectional DC-DC converter operates in the BOOST discharge mode; according to the boost voltage reference V Discharge , discharge voltage sampling signal u o , discharge current sampling signal i discharge , discharge current reference I discharge and the current sampling signal i of the drain-source of MOS tube Q2 q2 , perform discharge voltage control and discharge current regulation of the circuit to achieve current control of circuit discharge; When the discharge voltage sampling signal u o Greater than the charge and discharge judgment threshold V C / D When the bidirectional DC-DC converter operates in the BUCK charging mode; according to the step-down voltage reference V Charge , charging voltage sampling signal u c , charging current sampling signal i charge , charging current reference I charge and the drain-source current sampling signal i of the MOS tube Q1 q1 , to control the charging voltage and adjust the charging current of the circuit, and realize the current control of the circuit charging.

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