WO2022227696A1 - Circuit de conversion d'énergie - Google Patents

Circuit de conversion d'énergie Download PDF

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Publication number
WO2022227696A1
WO2022227696A1 PCT/CN2022/070965 CN2022070965W WO2022227696A1 WO 2022227696 A1 WO2022227696 A1 WO 2022227696A1 CN 2022070965 W CN2022070965 W CN 2022070965W WO 2022227696 A1 WO2022227696 A1 WO 2022227696A1
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WO
WIPO (PCT)
Prior art keywords
voltage
diode
circuit
switch tube
conversion circuit
Prior art date
Application number
PCT/CN2022/070965
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English (en)
Chinese (zh)
Inventor
陈书生
何宏伟
林敏�
陈焕新
林加富
Original Assignee
科华数据股份有限公司
漳州科华技术有限责任公司
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Application filed by 科华数据股份有限公司, 漳州科华技术有限责任公司 filed Critical 科华数据股份有限公司
Publication of WO2022227696A1 publication Critical patent/WO2022227696A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

Definitions

  • the present application relates to the technical field of power electronics, and in particular, to a power conversion circuit.
  • the Boost circuit is a boost circuit with a simple control method, and is widely used in various occasions.
  • the input voltage of the boost circuit is high, due to the limited voltage stress of a single switch tube and diode in the boost circuit, in some occasions, two switches and two diodes are connected in series.
  • Figure 1 is a schematic diagram of the structure of a flying capacitor clamped three-level boost circuit, and, in practical applications, multiple flying capacitor clamped three-level boost circuits will be set in parallel as required, that is, each The output terminals of the circuit are connected in parallel together as the bus voltage.
  • the input voltage will all increase To the switch tube Q2 in Figure 1, it may cause overvoltage damage to Q2.
  • the diode D2 in Figure 1 will withstand the full bus voltage and may cause D2 to be damaged by overvoltage.
  • the purpose of this application is to provide a power conversion circuit to solve the technical problems of the overvoltage of the switch tube and the overvoltage of the diode in the booster circuit.
  • a power conversion circuit includes: a voltage control circuit and a first boost circuit, wherein the first boost circuit includes: a first inductor, a first diode, a second diode, a first switch tube, a second a switch tube, a first flying capacitor and an output capacitor unit;
  • the first end of the first inductor and the second end of the second switch tube are respectively used as the positive input end and the negative input end of the first boost circuit, and the second end of the first inductor is respectively connected to the anode of the first diode and the first end of the first switch tube, the cathode of the first diode is respectively connected to the anode of the second diode and the first flyover
  • the first end of the capacitor is connected, the second end of the first flying capacitor is respectively connected with the first end of the second switch tube and the second end of the first switch tube, and the second diode
  • the cathode of the output capacitor unit is connected to the first end of the output capacitor unit and is used as the positive electrode of the bus voltage, and the second end of the output capacitor unit is used as the negative electrode of the bus voltage;
  • the voltage control circuit is configured to: after the first booster circuit is powered on, control the voltage of the first flying capacitor to always keep within a preset first voltage range, so that the second second The bus voltage that the pole tube is subjected to is always kept lower than the withstand voltage value of the second diode, and the voltage that the second switch tube is subjected to is always kept lower than the withstand voltage value of the second switch tube. pressure state.
  • the power conversion circuit further includes: K second boost circuits having the same structure as the first boost circuit, and the output bus bars of the K second boost circuits are all the same as the first boost circuit.
  • the output bus bars of the first boost circuit are connected in parallel;
  • K is a positive integer;
  • the voltage control circuit is specifically configured to: after any one of the first boost circuit and the K second boost circuits is powered on, control the voltage of the first flying capacitor to always keep at a preset level. Set the first voltage range, and control the voltage of the flying capacitor in each of the K second boost circuits to always keep within the first voltage range .
  • the voltage control circuit includes: the first switch tube, the second switch tube, a first power supply circuit, and a controller, and the controller is used for:
  • the voltage of the first flying capacitor is controlled to always be controlled by controlling the duty ratio of the first switch tube and the second switch tube. be kept within the preset first voltage range, so that the bus voltage that the second diode is subjected to is always kept lower than the withstand voltage value of the second diode, and the The voltage borne by the second switch tube is always kept lower than the withstand voltage value of the second switch tube;
  • the charging control of the first flying capacitor is performed, and the first flying capacitor is controlled.
  • the voltage of the flying capacitor is always kept within the preset first voltage range, so that the bus voltage that the second diode is subjected to is always kept lower than the withstand voltage value of the second diode state, and the voltage borne by the second switch tube is always kept in a state lower than the withstand voltage value of the second switch tube.
  • the first terminal of the first flying capacitor is connected to the positive pole of the first power supply circuit, and the second terminal of the first flying capacitor is connected to the anode of the first power supply circuit. Negative connection.
  • the power conversion circuit further includes:
  • the cathode of the third diode is connected to the first end of the first flying capacitor, and the anode of the third diode is connected to the anode of the first power supply circuit;
  • a fourth diode, the anode of the fourth diode is connected to the second end of the first flying capacitor, and the cathode of the fourth diode is connected to the cathode of the first power supply circuit.
  • the output capacitor unit is an output capacitor unit formed by connecting a first output capacitor and a second output capacitor in series;
  • the first power supply circuit is a first DC conversion circuit; and the positive input terminal of the first DC conversion circuit is connected to the positive pole of the bus voltage, and the negative input of the first DC conversion circuit The terminal is connected to the connection terminal of the first output capacitor and the second output capacitor, and the positive output terminal and the negative output terminal of the first DC conversion circuit are respectively used as the positive and negative electrodes of the first power supply circuit. .
  • the power conversion circuit further includes: a fifth diode, a sixth diode and an input capacitor unit;
  • the first end of the first flying capacitor is connected to the cathode of the fifth diode, the anode of the fifth diode is connected to the anode of the first power supply circuit, and the first flying capacitor
  • the second end of the circuit is connected to the anode of the sixth diode, and the cathode of the sixth diode is connected to the anode of the first power supply circuit;
  • the negative electrode of the first power supply circuit is connected to the negative electrode of the bus voltage; the first end and the second end of the input capacitor unit are respectively connected to the first end of the first inductor and the second end of the second switch tube. end connection.
  • the first power supply circuit is a second DC conversion circuit
  • the output capacitor unit is an output capacitor unit composed of a first output capacitor and a second output capacitor in series, and the first output capacitor is
  • the positive input terminal of the two-to-DC conversion circuit is connected to the connection terminal of the first output capacitor and the second output capacitor, and the negative input terminal of the second DC conversion circuit is connected to the negative terminal of the bus voltage.
  • the positive output terminal and the negative output terminal of the second DC conversion circuit are respectively used as the positive pole and the negative pole of the first power supply circuit;
  • the first power supply circuit is a third DC conversion circuit; and the positive input terminal of the third DC conversion circuit is connected to the positive pole of the bus voltage, and the negative input terminal of the third DC conversion circuit is connected to the The negative pole of the bus voltage is connected, and the positive output terminal and the negative output terminal of the third DC conversion circuit are respectively used as the positive pole and the negative pole of the first power supply circuit.
  • the first voltage range is through
  • Vc 1 represents the voltage of the first flying capacitor
  • V 1 represents the input voltage of the power conversion circuit
  • V 2 represents the bus voltage
  • V 3 represents the first diode
  • the first voltage range is through
  • Vc 1 represents the voltage of the first flying capacitor
  • V 1 represents the input voltage of the power conversion circuit
  • V 2 represents the bus voltage
  • V 3 represents the first diode
  • V 4 represents the first diode, the second diode, the The maximum safety margin of the first switch tube and the second switch tube.
  • the present application specially sets the voltage The control circuit performs timely charging of the flying capacitor. Specifically, after the first boost is turned on, the voltage control circuit will control the voltage of the first flying capacitor to always keep within the preset first voltage range, because the voltage of the first flying capacitor is always kept within the preset voltage range.
  • the bus voltage that the second diode is subjected to is kept lower than the withstand voltage value of the second diode, and at the same time, the voltage that the second switching tube is subjected to is kept as The state is lower than the withstand voltage value of the second switch tube. Therefore, in the solution of the present application, the overvoltage of the second diode caused by the bus voltage will not occur, and at the same time, the solution of the present application will not cause the overvoltage of the second switch tube caused by the input voltage.
  • FIG. 1 is a schematic structural diagram of a conventional flying capacitor clamped three-level boost circuit
  • FIG. 2 is a schematic structural diagram of a power conversion circuit in the application
  • FIG. 3 is a schematic diagram of a first structure of a power conversion circuit in a specific embodiment of the present application.
  • FIG. 4 is a schematic diagram of a second structure of a power conversion circuit in a specific embodiment of the present application.
  • FIG. 5 is a schematic diagram of a first structure of a first power supply circuit in a specific embodiment of the present application.
  • FIG. 6 is a schematic diagram of a third structure of a power conversion circuit in a specific embodiment of the present application.
  • FIG. 7 is a schematic diagram of a second structure of a first power supply circuit in an embodiment of the present application.
  • the core of the present application is to provide a power conversion circuit, which will not cause the overvoltage damage of the second diode caused by the bus voltage. At the same time, the solution of the present application will not cause the second switch tube to be overvoltage caused by the input voltage. happening.
  • FIG. 2 is a schematic structural diagram of a power conversion circuit in the present application.
  • the power conversion circuit may include: a voltage control circuit 10 and a first boost circuit.
  • the first boost circuit includes: a first inductor L1, a first diode D11, a second diode D21, a first switch transistor Q11, a second switch transistor Q21, a first flying capacitor C11 and an output capacitor unit 20;
  • the first end of the first inductor L1 and the second end of the second switch tube Q21 are respectively used as the positive input end and the negative input end of the first boost circuit, and the second end of the first inductor L1 is respectively connected with the first diode.
  • the anode of the tube D11 is connected to the first end of the first switching tube Q11, and the cathode of the first diode D11 is connected to the anode of the second diode D21 and the first end of the first flying capacitor C11 respectively.
  • the second end of the transcapacitor C11 is respectively connected to the first end of the second switch tube Q21 and the second end of the first switch tube Q11, and the cathode of the second diode D21 is connected to the first end of the output capacitor unit 20 and serves as a The positive pole of the bus voltage, and the second end of the output capacitor unit 20 is used as the negative pole of the bus voltage;
  • the voltage control circuit 10 is configured to: after the first boost circuit is powered on, control the voltage of the first flying capacitor C11 to always keep within a preset first voltage range, so that the second diode D21 can withstand the voltage
  • the bus voltage is always kept lower than the withstand voltage value of the second diode D21, and the voltage borne by the second switch tube Q21 is always kept lower than the withstand voltage value of the second switch tube Q21.
  • the first boost circuit of the present application is a three-level boost circuit clamped by a flying capacitor.
  • the first boost circuit includes: a first inductor L1, a first diode D11 , the second diode D21 , the first switch tube Q11 , the second switch tube Q21 , the first flying capacitor C11 and the output capacitor unit 20 .
  • the output capacitor unit 20 can generally be composed of one capacitor or two capacitors. In the embodiment of FIG. 3 , the output capacitor unit 20 is an output capacitor unit 20 composed of a first output capacitor C21 and a second output capacitor C31 in series.
  • the output of the first boost circuit may be connected to a load.
  • the input of the first booster circuit is usually direct current. In FIG. 2 , the input of the first booster circuit is marked as Vin1 .
  • Bus+ is the positive pole of the bus voltage
  • Bus- is the negative pole of the bus voltage.
  • a voltage control circuit 10 is provided for performing voltage control of the first flying capacitor C11. Specifically, after the first booster circuit is powered on, that is, after the power conversion circuit is powered on, the voltage control circuit 10 will control the voltage of the first flying capacitor C11 to always keep within the preset first voltage range. There are also many ways to determine whether the first booster circuit is powered on. For example, in one occasion, when the power conversion circuit receives a power-on command, it can be considered that the first booster circuit is powered on. In another example, in an occasion, when it is detected that the input of the first booster circuit is powered on, or when it is detected that the busbar is powered on, it can be determined that the first booster circuit has been powered on.
  • the relevant voltage thresholds for judging whether the input has electricity and judging whether the bus is energized can be set and adjusted as required.
  • the duty cycle refers to the percentage of the time the circuit is turned on in the entire circuit working cycle.
  • the bus voltage that the second diode D21 is subjected to is always kept lower than the withstand voltage value of the second diode D21 , that is, the voltage of the first flying capacitor C11 will not be too low, resulting in damage to the second diode D21 caused by the bus voltage.
  • the voltage borne by the second switch tube Q21 can always be kept lower than the withstand voltage value of the second switch tube Q21, that is, the voltage of the first flying capacitor C11 will not be too low, causing the input voltage to The damage caused by the second switch tube Q21.
  • the first diode D11 or the first switch will not be caused by the voltage of the first flying capacitor C11 being too high. Tube Q11 is damaged.
  • the specific range value of the first voltage range can be set according to the actual situation, for example, it can be considered according to the input voltage, the bus voltage, the parameters of each device and other factors, but it can be understood that the specific range value of the first voltage range is set. It is necessary to be able to achieve the state of the present application that the bus voltage experienced by the second diode D21 is always kept lower than the withstand voltage value of the second diode D21, and the voltage endured by the second switch tube Q21 is always maintained. For the purpose of a state lower than the withstand voltage value of the second switch tube Q21.
  • the first voltage range is through
  • Vc 1 represents the voltage of the first flying capacitor C11
  • V 1 represents the input voltage of the power conversion circuit
  • V 2 represents the bus voltage
  • V 3 represents the first diode D11
  • the second diode The minimum withstand voltage value of the tube D21, the first switch tube Q11 and the second switch tube Q21.
  • Vc 1 ⁇ V 1- V 3 the value range of Vc 1 obtained by simultaneously satisfying Vc 1 ⁇ V 1- V 3, Vc 1 ⁇ V 2- V 3 and Vc 1 ⁇ V 3 is taken as the first voltage range.
  • V 3 represents the minimum withstand voltage value of the first diode D11, the second diode D21, the first switch Q11 and the second switch Q21, and in practical applications, the first The diode D11 and the second diode D21 are usually the same type of device, the first switch Q11 and the second switch Q21 are usually the same type of device, and the first diode D11, the second diode D21, the withstand voltage values of the first switch transistor Q11 and the second switch transistor Q21 are generally approximately the same, and both exceed the half bus voltage at least.
  • the minimum withstand voltage values of the first diode D11, the second diode D21, the first switch Q11 and the second switch Q21 are selected as V 3, and the first voltage range is set based on V 3, which is beneficial to effectively avoid overvoltage damage of the first diode D11, the second diode D21, the first switch Q11 and the second switch Q21.
  • Vc 1 ⁇ V 2 - V 3 therefore, when the bus voltage is energized and the input has no electricity, the voltage of the first flying capacitor C11 can reach at least V 2 - V 3, so the voltage applied to the second flying capacitor C11 is at least V 2 - V 3.
  • the first voltage range is through
  • Vc 1 represents the voltage of the first flying capacitor C11
  • V 1 represents the input voltage of the power conversion circuit
  • V 2 represents the bus voltage
  • V 3 represents the first diode D11, the second diode Tube D21, the minimum withstand voltage value of the first switch tube Q11 and the second switch tube Q21
  • V 4 represents the first diode D11, the second diode D21, the first switch tube Q11 and the second switch tube Q21 maximum safety margin.
  • the determined first voltage range is smaller than the first voltage range determined in the foregoing embodiment, in order to further ensure the conservativeness of the solution and improve the service life of the device.
  • the minimum withstand voltage value of the first diode D11, the second diode D21, the first switch Q11 and the second switch Q21 is V 3
  • the safety margin of the device means that the maximum allowable operating voltage value of the device is the withstand voltage value of the device minus the safety margin of the device. In this case, the operation of the device can guarantee the operation of the device. life.
  • the withstand voltage of the second switch Q21 is 1000V
  • the safety margin is 100V
  • the second switch Q21 is only allowed to withstand 900V at maximum to ensure the operating life of the second switch Q21.
  • the limitation of the safety margin of the diode D21 ensures the service life of the second diode D21.
  • the safety margins of the first diode D11, the second diode D21, the first switch Q11 and the second switch Q21 are the same, that is, they are preset to the same value, but , in this embodiment of the present application, it is considered that if different values are set in some occasions, in order to ensure the conservativeness of the scheme, the present application selects the first diode D11, the second diode D21, the The maximum safety margin V4 of one switch Q11 and the second switch Q21, and the first voltage range is determined based on V4 , so that the first diode D11, the second diode D21, the first switch Q11 And the second switch tube Q21 can meet the limit requirement of its own safety margin.
  • the power conversion circuit of the embodiment of the present application further includes: K second boost circuits having the same structure as the first boost circuit, and outputs of the K second boost circuits The busbars are all connected in parallel with the output busbars of the first boost circuit; K is a positive integer;
  • the voltage control circuit 10 is specifically configured to: after any one of the first booster circuit and the K second booster circuits is powered on, control the voltage of the first flying capacitor C11 to always maintain a preset first voltage range and the voltage of the flying capacitor in each of the K second boost circuits is controlled to be always kept within the first voltage range.
  • K second booster circuits may be set to be connected to the load in parallel with the first booster circuit.
  • K 1
  • K 1
  • the K second boost circuits have the same structure as the first boost circuit, that is, they are all three-level boost circuits clamped by flying capacitors.
  • the voltage control circuit 10 will control the voltage of the first flying capacitor C11 to always keep at the preset level.
  • the voltage of the flying capacitor in each of the K second boost circuits is controlled to be kept within the first voltage range all the time. That is to say, as long as the power conversion circuit is powered on, the first flying capacitor C11 in the first booster circuit and any flying capacitor in the K second booster circuits will be controlled by the voltage control circuit 10 , and the voltages of these flying capacitors are always controlled to be kept within a preset first voltage range. For example, in the specific situation of FIG. 3 , as long as the power conversion circuit is powered on, the first flying capacitor C11 and the flying capacitor C12 will always be controlled within the first voltage range.
  • each booster circuit in the power conversion circuit a corresponding voltage control unit may be configured for each booster circuit, and each voltage control unit constitutes the voltage control circuit 10 in the power conversion circuit, and each voltage The control units may have their own controllers, or may share one controller, as long as the purpose of the present application can be achieved, and the specific integration mode can be set according to actual needs, that is, the specific structure of the voltage control circuit 10 can be set according to actual needs. OK.
  • the voltage of the first flying capacitor C11 is controlled to be always kept at the preset first voltage level.
  • the first step can be determined. At least one of the boosting circuit and the K second boosting circuits is powered on, so the voltage of the first flying capacitor C11 can be controlled to always keep within the preset first voltage range.
  • the voltage control circuit 10 includes: a first switch transistor Q11, a second switch transistor Q21, a first power supply circuit 11 and a controller.
  • the controller is used for:
  • the voltage of the first flying capacitor C11 is controlled to be always kept at the preset value by controlling the duty ratio of the first switching transistor Q11 and the second switching transistor Q21.
  • the bus voltage received by the second diode D21 is always maintained at a state lower than the withstand voltage value of the second diode D21, and the voltage received by the second switch tube Q21 is always maintained at The state is lower than the withstand voltage value of the second switch tube Q21;
  • the charging control of the first flying capacitor C11 is performed by controlling the first power supply circuit 11, and the voltage of the first flying capacitor C11 is controlled to always keep Within the preset first voltage range, the bus voltage that the second diode D21 is subjected to is always kept lower than the withstand voltage value of the second diode D21, and that the second switching tube Q21 is subjected to The voltage is always kept lower than the withstand voltage value of the second switching transistor Q21.
  • the voltage control circuit 10 needs to control the voltage of the first flying capacitor C11 to always keep within the preset first voltage range, and the specific structure can be set as required, for example, it can be implemented based on a power supply circuit that controls charging.
  • the voltage control circuit 10 in this case can be realized by the first switch Q11, the second switch Q21, and the controller.
  • the first boost voltage when the first boost voltage is turned on and in the working mode, the first power supply circuit 11 may be turned off or the first power supply circuit 11 may be in a standby state.
  • the voltage of the voltage control circuit 10 in this case is The function can only be realized by using the first power supply circuit 11 and the controller.
  • the controller is not shown in the drawings of the present application, and it is understood that the controller may be connected to each controllable device in the power conversion circuit to control each controllable device.
  • the voltage of the first flying capacitor C11 can be controlled to always keep at the preset level by controlling the duty ratio of the first switching transistor Q11 and the second switching transistor Q21. set the first voltage range.
  • the first booster After the first booster is powered on and not in the working mode, it is necessary to control the charging of the first flying capacitor C11 by controlling the first power supply circuit 11 , so as to control the voltage of the first flying capacitor C11 Always stay within the preset first voltage range.
  • a common connection method is that the first terminal of the first flying capacitor C11 is connected to the positive terminal of the first power supply circuit 11 , and the second terminal of the first flying capacitor C11 is connected to the negative terminal of the first power supply circuit 11 .
  • the power conversion circuit may further include:
  • the third diode D31, the cathode of the third diode D31 is connected to the first end of the first flying capacitor C11, and the anode of the third diode D31 is connected to the anode of the first power supply circuit 11;
  • the fourth diode D41, the anode of the fourth diode D41 is connected to the second end of the first flying capacitor C11, and the cathode of the fourth diode D41 is connected to the cathode of the first power supply circuit 11.
  • a third diode D31 and a fourth diode D41 are set on the loop to limit the current direction and avoid reverse charging. To charge, thus further ensuring the stability of the scheme.
  • FIG. 4 in addition to the first booster circuit, there is a second booster circuit which has the same structure as the first booster circuit and is connected in parallel with the first booster circuit.
  • the capacitor is marked as C12 in FIG. 4.
  • C12 can also be connected to the first power supply circuit 11 with reference to the connection method of the first flying capacitor C11.
  • Corresponding diodes can also be provided on the loop, marked as D32 and D42 in Figure 4.
  • the specific circuit configuration of the first power supply circuit 11 can be set and adjusted according to actual needs. For example, it can be the first power supply circuit 11 with its own power source. 5.
  • the output capacitor unit 20 is an output capacitor unit 20 composed of a first output capacitor C21 and a second output capacitor C31 in series; and the first power supply circuit 11 is a first DC conversion circuit; The positive input terminal is connected to the positive pole of the bus voltage, the negative input terminal of the first DC conversion circuit is connected to the connection terminals of the first output capacitor C21 and the second output capacitor C31, and the positive output terminal of the first DC conversion circuit and The negative output terminals are used as the positive pole and the negative pole of the first power supply circuit 11 respectively.
  • the connection terminals of the first output capacitor C21 and the second output capacitor C31 are marked as point N, that is, the half-bus voltage point.
  • the first power supply circuit 11 does not have a power supply inside, and the first power supply circuit 11 directly obtains power from the bus bar, which is simple and convenient to obtain power.
  • the first power supply circuit 11 can choose a simple Boost circuit or a Buck circuit according to actual needs, as long as the purpose of the application can be achieved, that is, as long as the controller can control the first power supply circuit 11 to realize the first power supply circuit 11.
  • a voltage control of the flying capacitor C11 is sufficient.
  • the first power supply circuit 11 is specifically a basic Buck circuit, which is composed of a switch tube Q5 , a diode D5 , a capacitor C5 and an inductor L5 .
  • the controller realizes the control of the first power supply circuit 11 by controlling the switch tube Q5.
  • P2+ and P2- in FIG. 5 represent the positive and negative electrodes of the first power supply circuit 11 .
  • the power conversion circuit may further include: a fifth diode D51 , a sixth diode D61 and an input capacitor unit Cpv;
  • the first end of the first flying capacitor C11 is connected to the cathode of the fifth diode D51, the anode of the fifth diode D51 is connected to the positive electrode of the first power supply circuit 11, and the second end of the first flying capacitor C11 is connected to the anode of the first power supply circuit 11.
  • the anode of the sixth diode D61 is connected, and the cathode of the sixth diode D61 is connected with the anode of the first power supply circuit 11;
  • the negative electrode of the first power supply circuit 11 is connected to the negative electrode of the bus voltage; the first end and the second end of the input capacitor unit Cpv are respectively connected to the first end of the first inductor L1 and the second end of the second switch tube Q21 .
  • both the first terminal and the second terminal of the first flying capacitor C11 are connected to the anode of the first power supply circuit 11, so the fifth diode D51 and the sixth diode D61 need to be set, and
  • the first boost circuit needs to be provided with an input capacitor unit Cpv.
  • the first boost circuit usually has an input capacitor unit Cpv, and the input capacitor unit Cpv can be composed of a single capacitor or multiple capacitors connected in series.
  • the input capacitor unit Cpv is specifically a single capacitor. capacitor, and the negative pole of the bus voltage in Figure 6 is grounded.
  • the current can flow from the anode of the first power supply circuit 11 to the first flying capacitor C11 through the fifth diode D51, so as to be the first flying capacitor C11.
  • the transcapacitor C11 is charged, and then reaches the negative pole of the bus voltage through the body diode of the first switch transistor Q11, the first inductor L1 and the input capacitor unit Cpv.
  • the body diode refers to a parasitic diode inside the first switch transistor Q11.
  • the first power supply circuit 11 When the input is powered, the first power supply circuit 11 can be regarded as a function of the load at this time, and the current can be input from the input to the first inductor L1 to charge the first flying capacitor C11, and then pass through the sixth diode D61 and the first inductor L1. A power supply circuit 11 reaches the ground, that is, reaches the negative pole of the bus voltage.
  • the flying capacitor C12 in the second booster circuit in parallel with the first booster circuit in FIG. 6 can also be connected to the first power supply circuit 11 by referring to the first flying capacitor C11 . This enables the first power supply circuit 11 to perform voltage control on the flying capacitor C12, which will not be repeated here.
  • the first power supply circuit 11 is a second DC conversion circuit
  • the output capacitor unit 20 is an output capacitor composed of a first output capacitor C21 and a second output capacitor C31 in series Capacitor unit 20, and the positive input terminal of the second DC conversion circuit is connected to the connection terminal of the first output capacitor C21 and the second output capacitor C31, the negative input terminal of the second DC conversion circuit is connected to the negative pole of the bus voltage, and the second DC conversion circuit is connected to the negative terminal of the bus voltage.
  • the positive output terminal and the negative output terminal of the DC conversion circuit are respectively used as the positive pole and the negative pole of the first power supply circuit 11;
  • the first power supply circuit 11 is a third DC conversion circuit; and the positive input terminal of the third DC conversion circuit is connected to the positive terminal of the bus voltage, the negative input terminal of the third DC conversion circuit is connected to the negative terminal of the bus voltage, and the third DC conversion circuit is connected to the negative terminal of the bus voltage.
  • the positive output terminal and the negative output terminal of the conversion circuit are used as the positive pole and the negative pole of the first power supply circuit 11 respectively.
  • the first power supply circuit 11 may be specifically selected as a second DC conversion circuit or a third DC conversion circuit.
  • the first power supply circuit 11 is a basic Buck circuit, which is composed of a switch tube Q7 , a diode D7 , a capacitor C7 and an inductor L7 .
  • implementations such as a boost circuit can also be selected as required, as long as the purpose of the present application can be achieved.
  • the applicant considers that the situation of overvoltage of the switch tube and diode described in the background art will occur, mainly because the flying capacitor cannot be charged in time. Therefore, the present application specially sets the voltage The control circuit 10 performs timely charging of the flying capacitor.
  • the voltage control circuit 10 will control the voltage of the first flying capacitor C11 to always keep within the preset first voltage range, because the voltage of the first flying capacitor C11 always remains Within the preset first voltage range, therefore, the bus voltage experienced by the second diode D21 is kept lower than the withstand voltage value of the second diode D21, and at the same time, the second switch tube can be The voltage endured by the Q21 remains in a state lower than the withstand voltage value of the second switch transistor Q21.

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  • Dc-Dc Converters (AREA)

Abstract

Est prévu un circuit de conversion d'énergie, comprenant : un circuit de commande de tension (10) et un premier circuit survolteur. Le premier circuit survolteur comprend : une première bobine d'inductance (L1), une première diode (D11), une seconde diode (D21), un premier transistor de commutation (Q11), un second transistor de commutation (Q21), un premier condensateur volant (C11) et une unité de condensateur de sortie (20). Le circuit de régulation de tension (10) est utilisé pour : une fois que le premier circuit survolteur est mis sous tension, commander la tension du premier condensateur volant (C11) pour qu'elle reste en continu dans une première plage de tensions prédéfinie, de sorte que la tension de bus portée par la seconde diode (D21) reste en continu dans un état où elle est inférieure à une valeur de tension de tenue de la seconde diode (D21), et la tension portée par le second transistor de commutation (D21) reste en continu dans un état où elle est inférieure à une valeur de tension de tenue du second transistor de commutation (Q21). Dans la solution, la seconde diode (D21) ne sera pas soumise à un endommagement de surtension dû à la tension de bus, et le second transistor de commutation (Q21) ne sera pas soumis à une surtension due à une tension d'entrée.
PCT/CN2022/070965 2021-04-28 2022-01-10 Circuit de conversion d'énergie WO2022227696A1 (fr)

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WO2018045936A1 (fr) * 2016-09-09 2018-03-15 华为技术有限公司 Circuit de conversion de puissance de suralimentation et procédé de commande
WO2019066929A1 (fr) * 2017-09-29 2019-04-04 Intel Corporation Conversion de tensions de sortie multiples
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CN113098253A (zh) * 2021-04-28 2021-07-09 科华数据股份有限公司 一种功率变换电路

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WO2018045936A1 (fr) * 2016-09-09 2018-03-15 华为技术有限公司 Circuit de conversion de puissance de suralimentation et procédé de commande
WO2019066929A1 (fr) * 2017-09-29 2019-04-04 Intel Corporation Conversion de tensions de sortie multiples
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