DCDC converter

Abstract

The utility model relates to the technical field of vehicles, in particular to a DCDC converter which comprises a BOOST circuit, a phase-shifted full-bridge assembly and a voltage regulation assembly, the input end of the BOOST circuit is connected with the output end of a vehicle-mounted charger, the output end of the BOOST circuit is connected with the input end of the phase-shifted full-bridge assembly, and the output end of the phase-shifted full-bridge assembly is connected with the voltage regulation assembly. The BOOST circuit is used for adjusting an input voltage value of the vehicle-mounted charger to a first target voltage based on the current required output voltage; the output end of the phase-shifted full-bridge assembly is connected with the input end of the voltage regulation assembly, the phase-shifted full-bridge assembly is used for performing high-frequency regulation on the first target voltage to obtain a second output voltage, and the second output voltage is regulated to the current required output voltage through the voltage regulation assembly. Therefore, the problem that test resources are wasted due to the fact that a DC / DC transformer in the prior art cannot meet the short-period requirement is solved, the range of input voltage can be widened, the DC / DC transformer is compatible with more voltage platforms, and the development period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a DCDC converter. Background Art

[0002] In order to better adapt to short-cycle product development, component suppliers have gradually launched platform products so that they can be applied to automotive products on different voltage platforms in the shortest time. As a key converter for new energy vehicles to replenish low-voltage electrical appliances, on-board DC / DC requires a platform product that can meet different input voltages.

[0003] The application number is: CN201810246951.5, a bidirectional DCDC converter device, including a battery module and a power converter module, wherein the power converter module includes two H-bridge bidirectional DCDC converters connected in parallel at the input end, one or more first battery modules are connected to the power input end of the power converter module, and one or more second battery modules are respectively connected to one of the output ends of the power converter module.

[0004] However, the turns ratio of DC / DC transformers is a fixed value, and the output voltage range determines the input voltage range. Once the input voltage range is modified to adapt to different battery platforms, the transformer parameters need to be adjusted. The resulting impact is that the entire DC / DC converter needs to be re-verified, which cannot meet short-cycle requirements and also causes a waste of test resources. Utility Model Content

[0005] The present application provides a DCDC converter to solve the problem that the number of turns of a DC / DC transformer in the related art is a fixed value, and once the input voltage is modified, the parameters need to be adjusted, which cannot meet the requirements of a short cycle and leads to a waste of test resources. The input voltage range can be widened to be compatible with more voltage platforms, thereby shortening the development cycle.

[0006] The first aspect of the present application provides a DCDC converter, including: a BOOST circuit, a phase-shifted full-bridge component and a voltage regulation component, wherein:

[0007] The input end of the BOOST circuit is connected to the output end of the on-board charger, the output end of the BOOST is connected to the input end of the phase-shifted full-bridge component, and the BOOST circuit is used to adjust the input voltage value of the on-board charger to a first target voltage based on the current required output voltage;

[0008] The output end of the phase-shifted full-bridge component is connected to the input end of the voltage regulation component. The phase-shifted full-bridge component is used to perform high-frequency regulation on the first target voltage to obtain a second output voltage, and regulate the second output voltage to the currently required output voltage through the voltage regulation component.

[0009] Optionally, the BOOST circuit comprises:

[0010] A first inductor, one end of which is connected to the positive electrode of the output end of the on-board charger;

[0011] a first MOS transistor, wherein a drain of the first MOS transistor is connected to the other end of the first inductor, and a source of the first MOS transistor is grounded;

[0012] a first resistor, one end of which is connected to the first drive signal input end, and the other end of which is connected to the gate of the first MOS transistor;

[0013] a second resistor, one end of the second resistor being connected to the gate of the first MOS transistor, and the other end of the second resistor being connected to the source of the first MOS transistor;

[0014] a third resistor, one end of the third resistor being connected to the negative electrode of the output end of the vehicle charger, and the other end of the third resistor being connected to the source electrode of the first MOS tube;

[0015] a fourth resistor, one end of the fourth resistor being connected to one end of the third resistor, and the other end of the fourth resistor being connected to the other end of the third resistor;

[0016] a fifth resistor, one end of which is connected to the drain of the first MOS tube;

[0017] a first capacitor, one end of which is connected to the other end of the fifth resistor, and the other end of the fifth capacitor is connected to the source of the first MOS transistor;

[0018] a first diode, wherein a first input end of the first diode is connected to the other end of the first inductor, and an output end of the first diode is connected to a phase-shifted full-bridge component;

[0019] a second MOS transistor, wherein a drain of the second MOS transistor is connected to the second input end of the first diode, and a source of the second MOS transistor is grounded;

[0020] a sixth resistor, one end of which is connected to the second drive signal input terminal, and the other end of which is connected to the gate of the second MOS switch;

[0021] a seventh resistor, one end of the seventh resistor being connected to the gate of the second MOS switch, and the other end of the seventh resistor being connected to the source of the second MOS switch;

[0022] a second capacitor, one end of the second capacitor being connected to the output end of the first diode, and the other end of the second capacitor being grounded;

[0023] a third capacitor, one end of the third capacitor being connected to one end of the second capacitor, and the other end of the third capacitor being grounded;

[0024] a fourth capacitor, wherein one end of the second capacitor is connected to one end of the third capacitor, and the other end of the fourth capacitor is grounded.

[0025] Optionally, the phase-shifted full-bridge component comprises:

[0026] a third MOS transistor, wherein the drain of the third MOS transistor is connected to the output end of the BOOST circuit, and the source of the third MOS transistor is connected to the first input end of the voltage regulating component;

[0027] an eighth resistor, one end of the eighth resistor being connected to the gate of the third MOS transistor, and the other end of the eighth resistor being connected to the source of the third MOS transistor;

[0028] a fourth MOS tube, wherein the drain of the fourth MOS tube is connected to the source of the third MOS tube, and the source of the fourth MOS tube is connected to the ground line;

[0029] a ninth resistor, one end of which is connected to the gate of the fourth MOS transistor, and the other end of which is connected to the source of the fourth MOS transistor;

[0030] a fifth MOS tube, wherein the drain of the fifth MOS tube is connected to the drain of the third MOS tube, and the source of the fifth MOS tube is connected to the second input end of the voltage regulating component;

[0031] a tenth resistor, one end of which is connected to the gate of the fifth MOS transistor, and the other end of which is connected to the source of the fifth MOS transistor;

[0032] a sixth MOS tube, wherein the drain of the sixth MOS tube is connected to the source of the fifth MOS tube, and the source of the sixth MOS tube is grounded;

[0033] An eleventh resistor, one end of the eleventh resistor is connected to the gate of the sixth MOS tube, and the other end of the eleventh resistor is connected to the source of the sixth MOS tube.

[0034] Optionally, the above-mentioned DCDC converter further includes:

[0035] A filter component is connected to the output end of the voltage regulating component.

[0036] Optionally, the filtering component comprises:

[0037] a fifth capacitor, one end of which is connected to the first output end of the voltage regulating component;

[0038] a twelfth resistor, one end of the twelfth resistor being connected to the other end of the fifth capacitor;

[0039] A second inductor, wherein an input end of the second inductor is connected to a second output end of the voltage regulating component, and an output end of the second inductor is connected to a positive electrode of a battery module;

[0040] a sixth capacitor, one end of which is connected to the third output end of the voltage regulating component;

[0041] a thirteenth resistor, one end of the thirteenth resistor being connected to the sixth capacitor;

[0042] a seventh MOS transistor, wherein a source of the seventh MOS transistor is connected to the other end of the twelfth resistor, and a drain of the seventh MOS transistor is connected to the first output end of the voltage regulating component;

[0043] a fourteenth resistor, one end of the fourteenth resistor being connected to the source of the seventh MOS tube, and the other end of the fourteenth resistor being connected to the gate of the seventh MOS tube;

[0044] a fifteenth resistor, one end of which is connected to the gate of the seventh MOS tube;

[0045] an eighth MOS transistor, wherein a source of the eighth MOS transistor is connected to the other end of the twelfth resistor, and a drain of the eighth MOS transistor is connected to the first output end of the voltage regulating component;

[0046] a sixteenth resistor, one end of the sixteenth resistor being connected to the source of the eighth MOS transistor, and the other end of the sixteenth resistor being connected to the gate of the eighth MOS transistor;

[0047] a seventeenth resistor, one end of which is connected to the gate of the eighth MOS tube;

[0048] an eighteenth resistor, one end of the eighteenth resistor being connected to one end of the sixteenth resistor;

[0049] a second diode, wherein an input end of the second diode is connected to the first output end of the voltage regulating component, and an output end of the second diode is connected to the other end of the eighteenth resistor;

[0050] a seventh capacitor, one end of the seventh capacitor being connected to one end of the eighteenth resistor, and the other end of the seventh capacitor being connected to the output end of the second diode;

[0051] a nineteenth resistor, one end of which is connected to the sixth capacitor;

[0052] a ninth MOS tube, wherein a source of the ninth MOS tube is connected to the other end of the nineteenth resistor, and a drain of the ninth MOS tube is connected to the third output end of the voltage regulating component;

[0053] a twentieth resistor, one end of which is connected to the source of the ninth MOS tube, and the other end of which is connected to the gate of the ninth MOS tube;

[0054] a twenty-first resistor, one end of which is connected to the gate of the ninth MOS tube;

[0055] a tenth MOS transistor, wherein a source of the tenth MOS transistor is connected to the other end of the twentieth resistor, and a drain of the tenth MOS transistor is connected to the third output end of the voltage regulating component;

[0056] a twenty-second resistor, one end of which is connected to the source of the tenth MOS transistor, and the other end of which is connected to the gate of the tenth MOS transistor;

[0057] a twenty-third resistor, one end of which is connected to the gate of the tenth MOS tube;

[0058] a twenty-fourth resistor, one end of the twenty-fourth resistor being connected to one end of the twenty-second resistor;

[0059] a third diode, wherein an input end of the third diode is connected to a third output end of the voltage regulating component, and an output end of the third diode is connected to the other end of the twenty-fourth resistor;

[0060] an eighth capacitor, one end of the eighth capacitor being connected to the negative electrode of the battery module, and the other end of the eighth capacitor being connected to the output end of the third diode;

[0061] a twenty-fifth resistor, one end of the twenty-fifth resistor being connected to the other end of the second inductor;

[0062] a twenty-sixth resistor, one end of the twenty-sixth resistor being connected to the other end of the twenty-fifth resistor;

[0063] a twenty-seventh resistor, one end of the twenty-seventh resistor being connected to the other end of the twenty-sixth resistor;

[0064] a twenty-eighth resistor, one end of the twenty-eighth resistor being connected to the other end of the twenty-seventh resistor, and the other end of the twenty-eighth resistor being connected to the output end of the second diode;

[0065] a twenty-ninth resistor, one end of which is connected to the other end of the second inductor;

[0066] a 30th resistor, one end of the 30th resistor being connected to the other end of the 29th resistor;

[0067] a thirty-first resistor, one end of the thirty-first resistor being connected to the other end of the thirtieth resistor;

[0068] A thirty-second resistor, one end of the thirty-second resistor is connected to the other end of the thirty-first resistor, and the other end of the thirty-second resistor is connected to the output end of the second diode.

[0069] Optionally, the above-mentioned DCDC converter further includes:

[0070] A monitoring component, wherein the first port, the second port and the third port of the monitoring component are grounded.

[0071] Optionally, the monitoring component is a current transformer.

[0072] Optionally, the above-mentioned DCDC converter further includes:

[0073] A protection component, one end of which is connected to the fourth port of the monitoring component, and the other end of which is grounded.

[0074] Optionally, the protection component includes:

[0075] a thirty-third resistor, one end of the thirty-third resistor being connected to the fourth port of the current transformer, and the other end of the thirty-third resistor being grounded;

[0076] a fourth diode, wherein an input end of the fourth diode is connected to a fourth port of the current transformer;

[0077] a thirty-fourth resistor, one end of which is connected to the output end of the fourth diode, and the other end of which is grounded;

[0078] a thirty-fifth resistor, one end of the thirty-fifth resistor is connected to the output end of the fourth diode, and the other end of the thirty-fifth resistor is grounded;

[0079] a thirty-sixth resistor, one end of the thirty-sixth resistor is connected to the output end of the fourth diode, and the other end of the thirty-sixth resistor is grounded;

[0080] a thirty-seventh resistor, one end of which is connected to one end of the thirty-sixth resistor;

[0081] A ninth capacitor, one end of the ninth capacitor is connected to the other end of the thirty-seventh resistor, and the other end of the ninth capacitor is grounded.

[0082] Optionally, the voltage regulating component is a transformer

[0083] Beneficial effects of the utility model:

[0084] (1) The present application can perform two-stage boosting through a BOOST circuit and a phase-shifted full-bridge circuit to widen the voltage range of the input voltage.

[0085] (2) The present application can widen the voltage range of the input voltage, thereby eliminating the need to frequently change device parameters and thus shortening the development cycle.

[0086] (3) This application can widen the voltage range of the input voltage, be compatible with more voltage platforms, and improve compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Figure 1 A schematic diagram of a DCDC converter provided according to an embodiment of the present application;

[0088] Figure 2 Schematic diagram of a DCDC converter provided according to an embodiment of the present application.

[0089] Explanation of reference numerals: 10 - DCDC converter, 100 - BOOST circuit, 200 - phase-shifted full-bridge component and 300 - voltage regulation component. DETAILED DESCRIPTION

[0090] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0091] The DCDC converter of the embodiment of the present application is described below with reference to the accompanying drawings. In view of the fact that the number of turns of the DC / DC transformer in the related art mentioned in the above background technology is a fixed value, once the input voltage is modified, the parameters need to be adjusted, which cannot meet the requirements of the short cycle, resulting in the problem of waste of test resources. The present application provides a DCDC converter, including: a BOOST circuit, a phase-shifted full-bridge component and a voltage regulation component, wherein the input end of the BOOST circuit is connected to the output end of the on-board charger, the output end of the BOOST is connected to the input end of the phase-shifted full-bridge component, and the BOOST circuit is used to adjust the input voltage value of the on-board charger to the first target voltage based on the current required output voltage; the output end of the phase-shifted full-bridge component is connected to the input end of the voltage regulation component, and the phase-shifted full-bridge component is used to perform high-frequency regulation on the first target voltage to obtain a second output voltage, and the second output voltage is adjusted to the current required output voltage through the voltage regulation component. Thus, the problem that the DC / DC transformer in the related art cannot meet the requirements of the short cycle, resulting in the waste of test resources, can be solved, the range of input voltage can be widened, more voltage platforms can be compatible, and the development cycle can be shortened.

[0092] Specifically, Figure 1 A schematic diagram of a flow chart of a DCDC converter provided in an embodiment of the present application.

[0093] like Figure 1 As shown, the DCDC converter 10 includes: a BOOST circuit 100 , a phase-shifted full-bridge component 200 and a voltage regulation component 300 .

[0094] Among them, the input end of the BOOST circuit 100 is connected to the output end of the vehicle charger, and the output end of the BOOST is connected to the input end of the phase-shifted full-bridge component 200. The BOOST circuit 100 is used to adjust the input voltage value of the vehicle charger to the first target voltage based on the current required output voltage.

[0095] The output end of the phase-shifted full-bridge component 200 is connected to the input end of the voltage regulating component 300. The phase-shifted full-bridge component 200 is used to perform high-frequency regulation on the first target voltage to obtain a second output voltage, and regulate the second output voltage to the current required output voltage through the voltage regulating component 300.

[0096] Optionally, the voltage regulating component 300 is a transformer.

[0097] Alternatively, if Figure 2 As shown, the BOOST circuit 100 includes: a first inductor L1, a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1 to a seventh resistor R7, a first capacitor C1 to a fourth capacitor C4, and a first diode D1.

[0098] The first inductor L1 has one end connected to the positive electrode of the output end of the vehicle-mounted charger.

[0099] A first MOS transistor Q1 , wherein a drain of the first MOS transistor Q1 is connected to the other end of the first inductor L1 , and a source of the first MOS transistor Q1 is grounded.

[0100] A first resistor R1, one end of the first resistor R1 is connected to the first driving signal input end, and the other end of the first resistor R1 is connected to the gate of the first MOS transistor Q1.

[0101] The second resistor R2 has one end connected to the gate of the first MOS transistor Q1 and the other end connected to the source of the first MOS transistor Q1.

[0102] The third resistor R3 has one end connected to the negative electrode of the output end of the vehicle charger, and the other end connected to the source of the first MOS tube Q1.

[0103] A fourth resistor R4, one end of the fourth resistor R4 is connected to one end of the third resistor R3, and the other end of the fourth resistor R4 is connected to the other end of the third resistor R3.

[0104] A fifth resistor R5 , one end of which is connected to the drain of the first MOS transistor Q1 .

[0105] The first capacitor C1 has one end connected to the other end of the fifth resistor R5 , and the other end of the fifth capacitor C5 is connected to the source of the first MOS transistor Q1 .

[0106] The first diode D1 has a first input end connected to the other end of the first inductor L1 , and an output end of the first diode D1 connected to the phase-shifted full-bridge component 200 .

[0107] The second MOS transistor Q2 has a drain connected to the second input end of the first diode D1 and a source connected to the ground.

[0108] A sixth resistor R6, one end of the sixth resistor R6 is connected to the second driving signal input end, and the other end of the sixth resistor R6 is connected to the gate of the second MOS switch.

[0109] A seventh resistor R7, one end of the seventh resistor R7 is connected to the gate of the second MOS switch, and the other end of the seventh resistor R7 is connected to the source of the second MOS switch.

[0110] The second capacitor C2 has one end connected to the output end of the first diode D1 and the other end grounded.

[0111] A third capacitor C3, one end of the third capacitor C3 is connected to one end of the second capacitor C2, and the other end of the third capacitor C3 is grounded.

[0112] The fourth capacitor C4, one end of the second capacitor C2 is connected to one end of the third capacitor C3, and the other end of the fourth capacitor C4 is grounded.

[0113] It can be understood that in the BOOST circuit 100 of the embodiment of the present application, the first MOS tube Q1 and the second MOS tube Q2 are main power devices of the BOOST circuit 100. By controlling the switching time coordination of the first MOS tube Q1 and the second MOS tube Q2 and the "DC resistance" characteristic of the first inductor L1, the output voltage can be adjusted. The input voltage Vin (TP178 monitoring point voltage) of the BOOST circuit 100 is Vo (TP228 monitoring point voltage), the switching tube frequency is f1 (T1=1 / f1), the duty cycle is D1, and the MOS tube switching time is Ton.

[0114] Then: Vo=Vin*D1

[0115] D1 = Ton / T = (Vo-Vin) / Vo;

[0116] Therefore, the input voltage of BOOST can be calculated by given output voltage, duty cycle, switching frequency and MOS switching time.

[0117] Optionally, the phase-shifted full-bridge component 200 includes: a third MOS transistor Q3 to a sixth MOS transistor Q6 , and an eighth resistor R8 to an eleventh resistor R11 .

[0118] A third MOS transistor Q3 , wherein the drain of the third MOS transistor Q3 is connected to the output end of the BOOST circuit 100 , and the source of the third MOS transistor Q3 is connected to the first input end of the voltage regulating component 300 .

[0119] An eighth resistor R8, one end of the eighth resistor R8 is connected to the gate of the third MOS transistor Q3, and the other end of the eighth resistor R8 is connected to the source of the third MOS transistor Q3.

[0120] The fourth MOS tube Q4, the drain of the fourth MOS tube Q4 is connected to the source of the third MOS tube Q3, and the source of the fourth MOS tube Q4 is connected to the ground line.

[0121] A ninth resistor R9, one end of the ninth resistor R9 is connected to the gate of the fourth MOS transistor Q4, and the other end of the ninth resistor R9 is connected to the source of the fourth MOS transistor Q4.

[0122] A fifth MOS transistor Q5 , wherein the drain of the fifth MOS transistor Q5 is connected to the drain of the third MOS transistor Q3 , and the source of the fifth MOS transistor Q5 is connected to the second input terminal of the voltage regulating component 300 .

[0123] A tenth resistor R10, one end of the tenth resistor R10 is connected to the gate of the fifth MOS transistor Q5, and the other end of the tenth resistor R10 is connected to the source of the fifth MOS transistor Q5.

[0124] The sixth MOS transistor Q6 has a drain connected to the source of the fifth MOS transistor Q5 and a source connected to the ground.

[0125] An eleventh resistor R11 , one end of the eleventh resistor R11 is connected to the gate of the sixth MOS transistor Q6 , and the other end of the eleventh resistor R11 is connected to the source of the sixth MOS transistor Q6 .

[0126] Specifically, Figure 2 As shown, the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 are the main power devices of the phase-shifted full-bridge component 200 of the embodiment of the present application. The four MOS tube switches Q3, Q4, Q5 and Q6 are controlled by the phase-shifted full-bridge control chip to shift to the full-bridge input voltage Vi1, and a high-frequency square wave is obtained through the full-bridge converter, and then the output voltage (switching tube duty cycle D2) is obtained:

[0127] Vo1=D2*Vi1.

[0128] Alternatively, if Figure 2 As shown, the above-mentioned DCDC converter 10 further includes: a filtering component.

[0129] Among them, the filter component is connected to the output end of the voltage regulating component 300.

[0130] Alternatively, if Figure 2 As shown, the filtering component includes: a fifth capacitor C5 to a ninth capacitor C9, a twelfth resistor R12 to a thirty-second resistor R32, a second inductor L2, and a second diode D2 to a third diode D3.

[0131] Among them, the fifth capacitor C5 has one end connected to the first output end of the voltage regulating component 300 .

[0132] A twelfth resistor R12, one end of the twelfth resistor R12 is connected to the other end of the fifth capacitor C5.

[0133] The second inductor L2, the input end of the second inductor L2 is connected to the second output end of the voltage regulating component 300, and the output end of the second inductor L2 is connected to the positive electrode of the battery module.

[0134] The sixth capacitor C6 has one end connected to the third output end of the voltage regulating component 300 .

[0135] The thirteenth resistor R13, one end of the thirteenth resistor R13 is connected to the sixth capacitor C6.

[0136] The seventh MOS transistor Q7 has a source connected to the other end of the twelfth resistor R12 , and a drain connected to the first output end of the voltage regulating component 300 .

[0137] A fourteenth resistor R14, one end of the fourteenth resistor R14 is connected to the source of the seventh MOS transistor Q7, and the other end of the fourteenth resistor R14 is connected to the gate of the seventh MOS transistor Q7.

[0138] A fifteenth resistor R15, one end of which is connected to the gate of the seventh MOS transistor Q7.

[0139] An eighth MOS transistor Q8 , wherein the source of the eighth MOS transistor Q8 is connected to the other end of the twelfth resistor R12 , and the drain of the eighth MOS transistor Q8 is connected to the first output end of the voltage regulating component 300 .

[0140] A sixteenth resistor R16, one end of the sixteenth resistor R16 is connected to the source of the eighth MOS transistor Q8, and the other end of the sixteenth resistor R16 is connected to the gate of the eighth MOS transistor Q8.

[0141] A seventeenth resistor R17, one end of which is connected to the gate of the eighth MOS transistor Q8.

[0142] An eighteenth resistor R18, one end of the eighteenth resistor R18 is connected to one end of the sixteenth resistor R16.

[0143] The second diode D2, the input end of the second diode D2 is connected to the first output end of the voltage regulating component 300, and the output end of the second diode D2 is connected to the other end of the eighteenth resistor R18.

[0144] A seventh capacitor C7, one end of the seventh capacitor C7 is connected to one end of the eighteenth resistor R18, and the other end of the seventh capacitor C7 is connected to the output end of the second diode D2.

[0145] A nineteenth resistor R19, one end of the nineteenth resistor R19 is connected to the sixth capacitor C6.

[0146] A ninth MOS transistor Q9 , wherein the source of the ninth MOS transistor Q9 is connected to the other end of the nineteenth resistor R19 , and the drain of the ninth MOS transistor Q9 is connected to the third output end of the voltage regulating component 300 .

[0147] A twentieth resistor R20, one end of the twentieth resistor R20 is connected to the source of the ninth MOS transistor Q9, and the other end of the twentieth resistor R20 is connected to the gate of the ninth MOS transistor Q9.

[0148] A twenty-first resistor R21, one end of which is connected to the gate of the ninth MOS transistor Q9.

[0149] The tenth MOS transistor Q10 , the source of the tenth MOS transistor Q10 is connected to the other end of the twentieth resistor R20 , and the drain of the tenth MOS transistor Q10 is connected to the third output end of the voltage regulating component 300 .

[0150] A twenty-second resistor R22, one end of the twenty-second resistor R22 is connected to the source of the tenth MOS transistor Q10, and the other end of the twenty-second resistor R22 is connected to the gate of the tenth MOS transistor Q10.

[0151] The twenty-third resistor R23 has one end connected to the gate of the tenth MOS tube.

[0152] The twenty-fourth resistor R24 ​​has one end connected to one end of the twenty-second resistor R22.

[0153] The third diode D3, the input end of the third diode D3 is connected to the third output end of the voltage regulating component 300, and the output end of the third diode is connected to the other end of the twenty-fourth resistor R24.

[0154] An eighth capacitor C8, one end of the eighth capacitor C8 is connected to the negative electrode of the battery module, and the other end of the eighth capacitor C8 is connected to the output end of the third diode D3.

[0155] The twenty-fifth resistor R25 has one end connected to the other end of the second inductor L2.

[0156] The twenty-sixth resistor R26 has one end connected to the other end of the twenty-fifth resistor R25.

[0157] The twenty-seventh resistor R27 has one end connected to the other end of the twenty-sixth resistor R26.

[0158] The twenty-eighth resistor R28, one end of the twenty-eighth resistor R28 is connected to the other end of the twenty-seventh resistor R27, and the other end of the twenty-eighth resistor R28 is connected to the output end of the second diode D2.

[0159] A twenty-ninth resistor R29 , one end of which is connected to the other end of the second inductor L2 .

[0160] A 30th resistor R30, one end of the 30th resistor R30 is connected to the other end of the 29th resistor R29.

[0161] A thirty-first resistor R31, one end of the thirty-first resistor R31 is connected to the other end of the thirtieth resistor R30.

[0162] A thirty-second resistor R32, one end of the thirty-second resistor R32 is connected to the other end of the thirty-first resistor R31, and the other end of the thirty-second resistor R32 is connected to the output end of the second diode D2.

[0163] Specifically, after passing through the transformer, n1*Vo1 (n1 is the transformer turns ratio) is obtained. After full-wave rectification and filtering by D2 and D3, the output value is obtained:

[0164] Vo2 = n1 * Vo1;

[0165] After the BOOST circuit 100 and the phase-shifted full-bridge component 200, the relationship between the input voltage and the output voltage is finally obtained:

[0166] Vo2=n1*D2*Vin*D1;

[0167] In summary, the entire DC / DC conversion circuit is composed of three factors: the duty cycle of the MOS of the BOOST circuit 100, the duty cycle of the MOS of the phase-shifted full-bridge component 200, and the turns ratio. The duty cycle value can be between 0 and 1, so when the output voltage range is certain, the input voltage range is larger than that of the first-stage boost circuit.

[0168] Alternatively, if Figure 2 As shown, the above-mentioned DCDC converter 10 further includes: a monitoring component.

[0169] Wherein, the first port, the second port and the third port of the monitoring component are grounded.

[0170] Optionally, the monitoring component is a current transformer.

[0171] Alternatively, if Figure 2 As shown, the above-mentioned DCDC converter 10 further includes: a protection component.

[0172] Among them, the protection component, one end of the protection component is connected to the fourth port of the monitoring component, and the other end of the protection component is grounded.

[0173] Alternatively, if Figure 2 As shown, the protection component includes: a thirty-third resistor R33 to a thirty-seventh resistor R37, a fourth diode D4 and a ninth capacitor C9.

[0174] A thirty-third resistor R33, one end of the thirty-third resistor R33 is connected to the fourth port of the current transformer, and the other end of the thirty-third resistor R33 is grounded;

[0175] a fourth diode D4, wherein an input end of the fourth diode D4 is connected to a fourth port of the current transformer;

[0176] A thirty-fourth resistor R34, one end of the thirty-fourth resistor R34 is connected to the output end of the fourth diode D4, and the other end of the thirty-fourth resistor R34 is grounded;

[0177] A thirty-fifth resistor R35, one end of the thirty-fifth resistor R35 is connected to the output end of the fourth diode D4, and the other end of the thirty-fifth resistor R35 is grounded;

[0178] A thirty-sixth resistor R36, one end of the thirty-sixth resistor R36 is connected to the output end of the fourth diode D4, and the other end of the thirty-sixth resistor R36 is grounded;

[0179] a thirty-seventh resistor R37, one end of the thirty-seventh resistor R37 being connected to one end of the thirty-sixth resistor R36;

[0180] A ninth capacitor C9, one end of the ninth capacitor C9 is connected to the other end of the thirty-seventh resistor R37, and the other end of the ninth capacitor C9 is grounded.

[0181] The DCDC converter proposed in the embodiment of the present application includes: a BOOST circuit, a phase-shifted full-bridge component and a voltage regulating component, wherein the input end of the BOOST circuit is connected to the output end of the on-board charger, the output end of the BOOST is connected to the input end of the phase-shifted full-bridge component, and the BOOST circuit is used to adjust the input voltage value of the on-board charger to the first target voltage based on the current required output voltage; the output end of the phase-shifted full-bridge component is connected to the input end of the voltage regulating component, and the phase-shifted full-bridge component is used to perform high-frequency regulation on the first target voltage to obtain a second output voltage, and the second output voltage is adjusted to the current required output voltage through the voltage regulating component. Thus, the problem that the DC / DC transformer in the related art cannot meet the requirements of a short cycle, resulting in a waste of test resources, can be solved, the range of input voltage can be widened, more voltage platforms can be compatible, and the development cycle can be shortened.

[0182] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0183] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0184] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0185] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0186] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0187] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A DCDC converter, characterized in that: include: BOOST circuit, phase-shifted full-bridge component and voltage regulation component, among which, The input end of the BOOST circuit is connected to the output end of the on-board charger, the output end of the BOOST is connected to the input end of the phase-shifted full-bridge component, and the BOOST circuit is used to adjust the input voltage value of the on-board charger to a first target voltage based on the current required output voltage; as well as The output end of the phase-shifted full-bridge component is connected to the input end of the voltage regulation component. The phase-shifted full-bridge component is used to perform high-frequency regulation on the first target voltage to obtain a second output voltage, and regulate the second output voltage to the currently required output voltage through the voltage regulation component.

2. The converter according to claim 1, characterized in that The BOOST circuit comprises: A first inductor, one end of which is connected to the positive electrode of the output end of the on-board charger; a first MOS transistor, wherein a drain of the first MOS transistor is connected to the other end of the first inductor, and a source of the first MOS transistor is grounded; a first resistor, one end of which is connected to the first drive signal input end, and the other end of which is connected to the gate of the first MOS transistor; a second resistor, one end of the second resistor being connected to the gate of the first MOS transistor, and the other end of the second resistor being connected to the source of the first MOS transistor; a third resistor, one end of the third resistor being connected to the negative electrode of the output end of the vehicle charger, and the other end of the third resistor being connected to the source electrode of the first MOS tube; a fourth resistor, one end of the fourth resistor being connected to one end of the third resistor, and the other end of the fourth resistor being connected to the other end of the third resistor; a fifth resistor, one end of which is connected to the drain of the first MOS tube; a first capacitor, one end of which is connected to the other end of the fifth resistor, and the other end of the fifth capacitor is connected to the source of the first MOS transistor; a first diode, wherein a first input end of the first diode is connected to the other end of the first inductor, and an output end of the first diode is connected to a phase-shifted full-bridge component; a second MOS transistor, wherein a drain of the second MOS transistor is connected to the second input end of the first diode, and a source of the second MOS transistor is grounded; a sixth resistor, one end of which is connected to the second drive signal input terminal, and the other end of which is connected to the gate of the second MOS switch; a seventh resistor, one end of the seventh resistor being connected to the gate of the second MOS switch, and the other end of the seventh resistor being connected to the source of the second MOS switch; a second capacitor, one end of the second capacitor being connected to the output end of the first diode, and the other end of the second capacitor being grounded; a third capacitor, one end of the third capacitor being connected to one end of the second capacitor, and the other end of the third capacitor being grounded; a fourth capacitor, wherein one end of the second capacitor is connected to one end of the third capacitor, and the other end of the fourth capacitor is grounded.

3. The converter according to claim 2, characterized in that The phase-shifted full-bridge component comprises: a third MOS transistor, wherein the drain of the third MOS transistor is connected to the output end of the BOOST circuit, and the source of the third MOS transistor is connected to the first input end of the voltage regulating component; an eighth resistor, one end of the eighth resistor being connected to the gate of the third MOS transistor, and the other end of the eighth resistor being connected to the source of the third MOS transistor; a fourth MOS tube, a drain of the fourth MOS tube and a source of the third MOS tube being connected to the ground; a ninth resistor, one end of which is connected to the gate of the fourth MOS transistor, and the other end of which is connected to the source of the fourth MOS transistor; a fifth MOS tube, wherein the drain of the fifth MOS tube is connected to the drain of the third MOS tube, and the source of the fifth MOS tube is connected to the second input end of the voltage regulating component; a tenth resistor, one end of the tenth resistor being connected to the gate of the fifth MOS transistor, and the other end of the tenth resistor being connected to the source of the fifth MOS transistor; a sixth MOS tube, wherein the drain of the sixth MOS tube is connected to the source of the fifth MOS tube, and the source of the sixth MOS tube is grounded; An eleventh resistor, one end of the eleventh resistor is connected to the gate of the sixth MOS tube, and the other end of the eleventh resistor is connected to the source of the sixth MOS tube.

4. The converter according to claim 2, characterized in that Also includes: A filter component is connected to the output end of the voltage regulating component.

5. The converter according to claim 4, characterized in that The filtering component comprises: a fifth capacitor, one end of which is connected to the first output end of the voltage regulating component; a twelfth resistor, one end of the twelfth resistor being connected to the other end of the fifth capacitor; A second inductor, wherein an input end of the second inductor is connected to a second output end of the voltage regulating component, and an output end of the second inductor is connected to a positive electrode of a battery module; a sixth capacitor, one end of which is connected to the third output end of the voltage regulating component; a thirteenth resistor, one end of the thirteenth resistor being connected to the sixth capacitor; a seventh MOS transistor, wherein a source of the seventh MOS transistor is connected to the other end of the twelfth resistor, and a drain of the seventh MOS transistor is connected to the first output end of the voltage regulating component; a fourteenth resistor, one end of the fourteenth resistor being connected to the source of the seventh MOS tube, and the other end of the fourteenth resistor being connected to the gate of the seventh MOS tube; a fifteenth resistor, one end of which is connected to the gate of the seventh MOS tube; an eighth MOS transistor, wherein a source of the eighth MOS transistor is connected to the other end of the twelfth resistor, and a drain of the eighth MOS transistor is connected to the first output end of the voltage regulating component; a sixteenth resistor, one end of the sixteenth resistor being connected to the source of the eighth MOS transistor, and the other end of the sixteenth resistor being connected to the gate of the eighth MOS transistor; a seventeenth resistor, one end of which is connected to the gate of the eighth MOS tube; an eighteenth resistor, one end of the eighteenth resistor being connected to one end of the sixteenth resistor; a second diode, wherein an input end of the second diode is connected to the first output end of the voltage regulating component, and an output end of the second diode is connected to the other end of the eighteenth resistor; a seventh capacitor, one end of the seventh capacitor being connected to one end of the eighteenth resistor, and the other end of the seventh capacitor being connected to the output end of the second diode; a nineteenth resistor, one end of which is connected to the sixth capacitor; a ninth MOS tube, wherein a source of the ninth MOS tube is connected to the other end of the nineteenth resistor, and a drain of the ninth MOS tube is connected to the third output end of the voltage regulating component; a twentieth resistor, one end of which is connected to the source of the ninth MOS tube, and the other end of which is connected to the gate of the ninth MOS tube; a twenty-first resistor, one end of which is connected to the gate of the ninth MOS tube; a tenth MOS transistor, wherein a source of the tenth MOS transistor is connected to the other end of the twentieth resistor, and a drain of the tenth MOS transistor is connected to the third output end of the voltage regulating component; a twenty-second resistor, one end of which is connected to the source of the tenth MOS transistor, and the other end of which is connected to the gate of the tenth MOS transistor; a twenty-third resistor, one end of which is connected to the gate of the tenth MOS tube; a twenty-fourth resistor, one end of the twenty-fourth resistor being connected to one end of the twenty-second resistor; a third diode, wherein an input end of the third diode is connected to a third output end of the voltage regulating component, and an output end of the third diode is connected to the other end of the twenty-fourth resistor; an eighth capacitor, one end of the eighth capacitor being connected to the negative electrode of the battery module, and the other end of the eighth capacitor being connected to the output end of the third diode; a twenty-fifth resistor, one end of the twenty-fifth resistor being connected to the other end of the second inductor; a twenty-sixth resistor, one end of the twenty-sixth resistor being connected to the other end of the twenty-fifth resistor; a twenty-seventh resistor, one end of the twenty-seventh resistor being connected to the other end of the twenty-sixth resistor; a twenty-eighth resistor, one end of the twenty-eighth resistor being connected to the other end of the twenty-seventh resistor, and the other end of the twenty-eighth resistor being connected to the output end of the second diode; a twenty-ninth resistor, one end of which is connected to the other end of the second inductor; a 30th resistor, one end of the 30th resistor being connected to the other end of the 29th resistor; a thirty-first resistor, one end of the thirty-first resistor being connected to the other end of the thirtieth resistor; A thirty-second resistor, one end of the thirty-second resistor is connected to the other end of the thirty-first resistor, and the other end of the thirty-second resistor is connected to the output end of the second diode.

6. The converter according to claim 1, characterized in that Also includes: A monitoring component, wherein the first port, the second port and the third port of the monitoring component are grounded.

7. The converter according to claim 6, characterized in that The monitoring component is a current transformer.

8. The converter according to claim 7, characterized in that Also includes: A protection component, one end of which is connected to the fourth port of the monitoring component, and the other end of which is grounded.

9. The converter according to claim 8, characterized in that The protection component comprises: a thirty-third resistor, one end of the thirty-third resistor being connected to the fourth port of the current transformer, and the other end of the thirty-third resistor being grounded; a fourth diode, wherein an input end of the fourth diode is connected to a fourth port of the current transformer; a thirty-fourth resistor, one end of which is connected to the output end of the fourth diode, and the other end of which is grounded; a thirty-fifth resistor, one end of the thirty-fifth resistor is connected to the output end of the fourth diode, and the other end of the thirty-fifth resistor is grounded; a thirty-sixth resistor, one end of the thirty-sixth resistor is connected to the output end of the fourth diode, and the other end of the thirty-sixth resistor is grounded; a thirty-seventh resistor, one end of which is connected to one end of the thirty-sixth resistor; A ninth capacitor, one end of the ninth capacitor is connected to the other end of the thirty-seventh resistor, and the other end of the ninth capacitor is grounded.

10. The converter according to claim 1, characterized in that The voltage regulating component is a transformer.

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