• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Title: Prechargeable DCDC Conversion Circuit The present invention discloses a prechargeable DCDC conversion circuit, which includes a high voltage side conversion module connected to the primary winding of the main transformer T1, a low voltage side conversion module connected to the secondary winding of the main transformer, a driver of the high voltage side and low voltage side conversion modules, and a precharging module connected in series to the DC bus of the low voltage side conversion module, the precharging module precharging the capacitor electrical equipment connected to the DC bus of the converter module on the high voltage side when the equipment set is powered up; the present invention overcomes the drawbacks of the existing art and provides a prechargeable DCDC converter circuit, the present invention provides an improvement based on the existing DCDC converter, in which the precharge module shares most of the power elements and the circuit powerful with the direct DCDC by adding a small number of elements, which makes it possible to reduce the volume and the cost compared to an independent precharging branch, and to simplify the mode of control. Figure for the abstract: Figure 2
    公开号:FR3108455A1
    申请号:FR2102411
    申请日:2021-03-11
    公开日:2021-09-24
    发明作者:Jun Liu；Yingying Feng；Shun Yao；Changsheng Zhang
    申请人:Shenzhen VMAX New Energy Co Ltd；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the technical field of recharging electric vehicles, in particular relates to a pre-chargeable DCDC conversion circuit.
    [0002] To meet the demands on energy saving and emission reduction, and the need for air pollution control, new energy vehicles are gradually being marketed, among which electric vehicles are becoming the main force. Electrical equipment of electric vehicles have a large equivalent capacity, when starting the set of equipment, the instantaneous charge current is very large, often causing burnout of the circuit or dangerous factors. To solve this problem, the prior art is to connect a precharge branch in parallel next to the main relay between the high voltage battery and the electrical equipment, in order to first gently charge the capacitor with a low current, and to close the main relay once the capacitor voltage has increased and the charging current has decreased. The pre-charge branch in the existing art is connected in parallel with the main relay S1 (as shown in the which is a control principle diagram of the equipment set of the present invention, in which the precharge branch is connected in parallel to both ends of the main relay S1 according to the existing art, the precharge branch being represented by dashed lines, which means that such connection is not adopted in the present invention), the precharge branch and the DCDC converter are separated, having the disadvantages such as many components, large volume, high cost and a complicated order.
    [0003] Therefore, a technical problem which is urgently needed for those skilled in the art is to integrate the precharge function in DCDC converters to reuse existing DCDC elements as much as possible, reduce the volume and reduce the cost.
    [0004] In order to overcome these above drawbacks in the existing art, the present invention provides a prechargeable DCDC conversion circuit.
    [0005] The technical solution of the present invention provides a prechargeable DCDC conversion circuit, which includes a high voltage side converter module connected to the primary winding of the main transformer T1, a low voltage side converter module connected to the secondary winding of the main transformer, a controller of the converter modules on the high voltage side and the low voltage side, and a precharge module connected in series to the DC bus of the converter module on the low voltage side, the precharge module precharging the capacitor of the Electrical equipment connected to the DC bus of the converter module on the high voltage side when the equipment set is powered on.
    [0006] The precharge module includes a secondary transformer L1, the primary winding of the secondary transformer is connected in series with the DC bus of the conversion module on the low voltage side, one end of the secondary winding of the secondary transformer is connected to the anode of the ninth diode D9 and the other end of the secondary winding of the secondary transformer are connected to the negative pole bus of the conversion module on the high voltage side and to one end of the fifth capacitor C5, and the cathode of the ninth diode is connected to the other end of the fifth capacitor and to the positive pole bus of the converter module on the high voltage side.
    [0007] When precharging, the controller sends a first PWM control signal to the power switch of the conversion module on the low voltage side to convert the direct current connected to the conversion module on the low voltage side into AC power, and to transmit the energy. to the converter module on the high voltage side via the secondary transformer L1 and the ninth diode D9.
    [0008] When precharging, the commander controls and deactivates the upper bridge arm power switch of the converter module on the high voltage side, and sends a second PWM control signal to the lower bridge arm power switch of the converter module. high voltage side.
    [0009] The precharge includes a slow start phase and a closed loop load phase, in the slow start phase the duty cycle range of the first PWM control signal is 0% to 50%, and in the load phase in closed loop, the duty cycle of the first PWM control signal is 50%.
    [0010] The high voltage side conversion module has a full bridge structure and includes a first power switch Q1, a second power switch Q2, a third power switch Q3, and a fourth power switch Q4.
    [0011] The high voltage side conversion module has a half bridge structure and includes a first power switch Q1 and a third power switch Q3.
    [0012] The low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6.
    [0013] The low voltage side conversion module has a full bridge structure and includes a fifth power switch Q5, a sixth power switch Q6, a seventh power switch Q7 and an eighth power switch Q8.
    [0014] The solution of the present invention exhibits the following beneficial effects:
    [0015] The present invention overcomes the drawbacks of the existing art and provides a prechargeable DCDC conversion circuit. The present invention provides an improvement based on the existing DCDC converter, in which the precharge module shares the power elements and the power circuit with the direct DCDC by adding a small number of elements, thereby reducing the volume and the cost compared to an independent preload branch, and to simplify the control mode.
    [0016] The present invention will be described in more detail below via the exemplary embodiments and the figures, in which:
    [0017] The is a control principle diagram of the equipment assembly according to the present invention;
    [0018] The is a wiring diagram of the full bridge + push-pull mode of Example 1 according to the present invention;
    [0019] The is a sequence diagram of precharge control according to the present invention;
    [0020] The is a wiring diagram of the full bridge + full rectification mode of Example 2 according to the present invention;
    [0021] The is a wiring diagram of the full bridge + full bridge rectification mode of Example 3 according to the present invention;
    [0022] The is a wiring diagram of the half-bridge + push-pull mode of Example 4 according to the present invention;
    [0023] The is a wiring diagram of the half-bridge + full rectification mode of Example 5 according to the present invention;
    [0024] The is a wiring diagram of the half-bridge + full-bridge rectification mode of Example 6 according to the present invention.
    [0025] Detailed description of embodiments of the invention
    [0026] The object, the technical solution and the advantages of the present invention will emerge more clearly on reading the following detailed description with reference to the following figures and exemplary embodiments. It should be noted that the embodiments described below are only illustrative embodiments, instead of limiting description for the present invention.
    [0027] The present invention discloses a prechargeable DCDC conversion circuit, which comprises a high voltage side conversion module connected to the primary winding of the main transformer T1, a low voltage side conversion module connected to the secondary winding of the main transformer, a controller of the converter modules on the high voltage side and the low voltage side, and a precharge module connected in series to the DC bus of the converter module on the low voltage side, the precharge module precharging the capacitor of the electrical equipment connected to the DC bus from the converter module on the high voltage side when the equipment assembly is powered up. The preload is a reverse operation. Once precharging is complete: the circuit can be in reverse operation for a long time; the reverse operation can also be stopped to switch to direct operation, that is, the converter module on the high voltage side powers the capacitor of the electrical equipment normally and supplies the converter module on the low voltage side.
    [0028] As shown in which is a control principle diagram of the equipment assembly according to the present invention, when starting the equipment assembly, the main relay disconnects the high voltage battery and the low voltage battery charges the equivalent capacitor of electrical equipment through the DCDC conversion circuit (the two-way DCDC converter in the is the circuit claimed by the present application), in order to first charge the equivalent capacitor of the electrical equipment gently with a low current, and to complete the precharge and to close the main relay after the voltage of the equivalent capacitor has increased and charge current decreased, so that the high voltage battery powers the electrical equipment and supplies the low voltage battery and other loads on the low voltage side through the DCDC converter.
    [0029] According to example 1 in the , the precharge module includes a secondary transformer L1, the primary winding of the secondary transformer is connected in series with the DC bus of the conversion module on the low voltage side, one end of the secondary winding of the secondary transformer is connected to the anode of the ninth diode D9 and the other end of the secondary winding of the secondary transformer are connected to the negative pole bus of the conversion module on the high voltage side and to one end of the fifth capacitor C5, and the cathode of the ninth diode is connected to the other end of the fifth capacitor and to the positive pole bus of the converter module on the high voltage side.
    [0030] During precharging, the controller sends a first PWM control signal to the power switch (Q5 and Q6 in the ) of the low voltage side converter module to convert the direct current connected to the low voltage side converter module to AC current, and to transmit the electric power to the high voltage side converter module through the secondary transformer L1 and the ninth diode D9.
    [0031] During precharging, the controller controls and deactivates the power switch (Q1 and Q2 in the ) from the upper bridge arm of the high voltage side converter module, and send a second PWM control signal to the power switch (Q3 and Q4 in the ) of the lower bridge arm of the converter module on the high voltage side.
    [0032] The principle of operation according to the present invention will be described in detail below with reference to the :
    [0033] In the , the power field effect transistors Q1, Q2, Q3, Q4, Q5 and Q6 are shown, among which the diodes D1, D2, D3, D4, D5 and D6 are respectively the body effect diodes of Q1, Q2 , Q3, Q4, Q5, and Q6.
    [0034] In full bridge mode during direct operation, DC voltage V1 on the high voltage side is chopped and converted by MOS transistors Q1 - Q4 to AC voltage, then passed to the secondary stage through transformer T1, rectified by Q5 and Q6 and filtered by L1 and capacitor 5, at the end converted to DC V2.
    [0035] The first PWM control signals S5 and S6 control Q5 and Q6, the duty cycles of S5 and S6 are the same, and the phase difference is 180 °. The two PWM control signals S3 and S4 control Q3 and Q4, and Q3 and Q4 are turned on and off synchronously, and the frequency is twice that of S5 and S6. In push-pull mode + voltage rise in reverse operation, in push-pull mode, the duty cycles of S5 and S6 are the same and the phase difference is 180 °, when the duty cycles of S5 and S6 are lower at 50%, a slow start strategy will be activated, the direct voltage V2 is converted by the MOS transistors Q5 and Q6 into the alternating voltage, then converted to the V1 side by the transformer T1, and rectified and filtered by the transistors D1 - D4 and the capacitors C1 and C 2 to be converted to V1, S3 and S4 are activated simultaneously to store additional energy for L1, and the energy stored in L1 is released to the V1 side via an excitation winding circuit reverse; in voltage boost mode, the duty cycles of S5 and S6 are greater than 50% and remain fixed, S1 and S2 are at a low level, the duty cycles of S3 and S4 are regulated to control the output voltage, Q3 and Q4 are turned on simultaneously, that is, the winding on the V1 side of T1 is short-circuited, in this case the inductor L1 stores energy, and when Q3 and Q4 are turned off, the energy stored in L1 will be released to the V1 side via the transformer T1 or the reverse excitation winding circuit (depends on the output voltage on the V1 side).
    [0036] According to a preferred example, the precharging comprises a slow start phase and a closed loop charging phase, in the slow start phase, the range of the duty cycle of the first PWM control signal is 0% to 50%, and in the closed loop charging phase, the duty cycle of the first PWM control signal is 50%. The control of the second PWM signal is closed-loop control, which can be realized according to the output voltage, and the range of the second PWM control signal is 0% to 50%.
    [0037] As shown in which is a precharge control sequential diagram, the left side belongs to the slow start phase, and the right side belongs to the closed loop charging phase. The duty cycle of each of the signals S5 and S6 which control Q5 and Q6 to the left is less than 50%, and the duty cycle is fixed at 50% when switched to the right.
    [0038] In some exemplary embodiments, the high voltage side conversion module has a full bridge structure and includes a first power switch Q1, a second power switch Q2, a third power switch Q3, and a fourth power switch Q4.
    [0039] In some other exemplary embodiments, the high voltage side conversion module has a half-bridge structure and includes a first power switch Q1 and a third power switch Q3.
    [0040] In some other exemplary embodiments, the low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6.
    [0041] In still some other exemplary embodiments, the low voltage side conversion module has a full bridge structure and includes a fifth power switch Q5, a sixth power switch Q6, a seventh power switch Q7 and an eighth power switch. Q8.
    [0042] As shown in which is a full bridge + push-pull mode wiring diagram of Example 1 according to the present invention, the high voltage side conversion module has a full bridge structure and includes a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4. Q1 and Q2 are two upper axle arms, and Q3 and Q4 are two lower axle arms. The low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6. Q5 and Q6 are connected to the DC bus of the negative pole of the voltage side.
    [0043] As shown in which is a full bridge + full rectification mode wiring diagram of Example 2 according to the present invention, the high voltage side conversion module has a full bridge structure and includes a first power switch Q1, a second switch power Q2, a third power switch Q3 and a fourth power switch Q4. Q1 and Q2 are two upper axle arms, and Q3 and Q4 are two lower axle arms. The low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6. Q5 and Q6 are connected to the DC bus of the positive pole on the voltage side.
    [0044] As shown in which is a full bridge + full rectification mode wiring diagram of Example 3 according to the present invention, the high voltage side conversion module has a full bridge structure and includes a first power switch Q1, a second switch power Q2, a third power switch Q3 and a fourth power switch Q4. Q1 and Q2 are two upper axle arms, and Q3 and Q4 are two lower axle arms. The low voltage side conversion module has a full bridge structure and includes a fifth power switch Q5, a sixth power switch Q6, a seventh power switch Q7 and an eighth power switch Q8. Q6 and Q7 are synchronous switches, and Q5 and Q8 are synchronous switches.
    [0045] As shown in which is a wiring diagram of the half-bridge + full rectification mode of Example 4 according to the present invention, the high-voltage side conversion module has a half-bridge structure and includes a first power switch Q1 and a third power switch Q3. During precharging, Q1 remains deactivated and Q3 receives the command from the second PWM control signal. The low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6. Q5 and Q6 are connected to the DC bus of the negative pole of the voltage side.
    [0046] As shown in which is a wiring diagram of the half-bridge + full rectification mode of Example 5 according to the present invention, the high-voltage side conversion module has a half-bridge structure and includes a first power switch Q1 and a third power switch Q3. During precharging, Q1 remains deactivated and Q3 receives the command from the second PWM control signal. The low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6. Q5 and Q6 are connected to the DC bus of the positive pole on the voltage side.
    [0047] As shown in which is a wiring diagram of the half-bridge + full rectification mode of Example 6 according to the present invention, the high-voltage side conversion module has a half-bridge structure and includes a first power switch Q1 and a third power switch Q3. During precharging, Q1 remains deactivated and Q3 receives the command from the second PWM control signal. The low voltage side conversion module has a full bridge structure and includes a fifth power switch Q5, a sixth power switch Q6, a seventh power switch Q7 and an eighth power switch Q8. Q6 and Q7 are synchronous switches, and Q5 and Q8 are synchronous switches.
    [0048] The embodiments below are only illustrative examples, but are not limiting. Any modifications or changes which respect the spirit and the scope of this application must be included within the scope of the protection of this application.
    权利要求:
    Claims (9)
    [0001]
    Preloadable DCDC conversion circuit, which includes a high voltage side converter module connected to the primary winding of the main transformer T1, a low voltage side converter module connected to the secondary winding of the main transformer, a controller of the conversion of the high voltage side and the low voltage side, characterized in that a precharge module connected in series with the DC bus of the conversion module of the low voltage side, the precharge module precharging the capacitor of the electrical equipment connected to the bus DC from the converter module to the high voltage side when the equipment assembly is powered on.
    [0002]
    Prechargeable DCDC conversion circuit according to claim 1, characterized in that, the precharge module comprises a secondary transformer L1, the primary winding of the secondary transformer is connected in series with the DC bus of the conversion module on the low voltage side, one end of the secondary winding of the secondary transformer is connected to the anode of the ninth diode D9 and the other end of the secondary winding of the secondary transformer are connected to the negative pole bus of the converter module on the high voltage side and to a end of the fifth capacitor C5, and the cathode of the ninth diode is connected to the other end of the fifth capacitor and to the positive pole bus of the converter module on the high voltage side.
    [0003]
    A prechargeable DCDC conversion circuit according to claim 2, characterized in that, upon precharging, the controller sends a first PWM control signal to the power switch of the conversion module on the low voltage side to convert the direct current connected to the control module. converting from the low voltage side to alternating current, and for transmitting electric power to the converting module on the high voltage side through the secondary transformer L1 and the ninth diode D9.
    [0004]
    Preloadable DCDC conversion circuit according to claim 3, characterized in that, during the precharging, the controller controls and deactivates the power switch of the upper bridge arm of the conversion module on the high voltage side, and sends a second control signal PWM to the lower bridge arm power switch of the high voltage side converter module.
    [0005]
    Prechargeable DCDC conversion circuit according to claim 3, characterized in that, the precharge comprises a slow start phase and a closed loop charging phase, in the slow start phase the range of the duty cycle of the first PWM control signal is 0% to 50%, and in the closed loop charging phase, the duty cycle of the first PWM control signal is 50%.
    [0006]
    A prechargeable DCDC conversion circuit according to claim 4, characterized in that, the high voltage side conversion module has a full bridge structure and includes a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4.
    [0007]
    A prechargeable DCDC conversion circuit according to claim 4, characterized in that, the high voltage side conversion module has a half-bridge structure and includes a first power switch Q1 and a third power switch Q3.
    [0008]
    A prechargeable DCDC conversion circuit according to claim 4, characterized in that, the low voltage side conversion module has a push-pull structure and includes a fifth power switch Q5 and a sixth power switch Q6.
    [0009]
    A prechargeable DCDC conversion circuit according to claim 4, characterized in that, the low voltage side conversion module has a full bridge structure and includes a fifth power switch Q5, a sixth power switch Q6, a seventh power switch Q7 and an eighth power switch Q8.
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    同族专利:
    公开号 | 公开日
    KR20210116305A|2021-09-27|
    CN111342676A|2020-06-26|
    DE112020000089T5|2021-11-18|
    WO2021184603A1|2021-09-23|
    US20210296993A1|2021-09-23|
    JP2021151184A|2021-09-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN104852586A|2015-05-27|2015-08-19|深圳科士达科技股份有限公司|Bi-directional DCDC converter|
    US20170033696A1|2015-07-31|2017-02-02|Denso Corporation|Power conversion apparatus|
    CN207283407U|2017-07-21|2018-04-27|南京理工大学|One kind can freely commutate two-way DC/DC converters|
    US20190068070A1|2017-08-30|2019-02-28|Denso Corporation|Electric power conversion device|
    CN110649822A|2019-10-29|2020-01-03|台达电子企业管理（上海）有限公司|DC/DC converter|
    CN107650729B|2017-10-26|2019-06-04|科博达技术股份有限公司|The pre-charging device of the High-Voltage Electrical Appliances of new-energy automobile|
    CN111342676A|2020-03-17|2020-06-26|深圳威迈斯新能源股份有限公司|DCDC conversion circuit capable of pre-charging|CN111342676A|2020-03-17|2020-06-26|深圳威迈斯新能源股份有限公司|DCDC conversion circuit capable of pre-charging|
    CN113839453B|2021-11-26|2022-02-22|深圳市永联科技股份有限公司|Battery control circuit, device and equipment|
    法律状态:
    2021-11-26| PLSC| Publication of the preliminary search report|Effective date: 20211126 |
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010187973.6A|CN111342676A|2020-03-17|2020-03-17|DCDC conversion circuit capable of pre-charging|
    CN202010187973.6|2020-03-17|
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