CN110723030A - Pre-charging starting circuit and method for DCDC converter for fuel cell vehicle - Google Patents
Pre-charging starting circuit and method for DCDC converter for fuel cell vehicle Download PDFInfo
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- CN110723030A CN110723030A CN201911114748.3A CN201911114748A CN110723030A CN 110723030 A CN110723030 A CN 110723030A CN 201911114748 A CN201911114748 A CN 201911114748A CN 110723030 A CN110723030 A CN 110723030A
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 title claims abstract description 84
- 239000000446 fuel Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims description 51
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract 2
- 230000008569 process Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/31—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for starting of fuel cells
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention belongs to the technical field of fuel cell automobiles, and discloses a pre-charging starting circuit of a DCDC converter for a fuel cell automobile, which comprises: including input pre-charge unit, DCDC converter, output pre-charge unit, fuel cell and whole car battery, fuel cell is connected with the input electricity of DCDC converter through input pre-charge unit, and the output of DCDC converter is connected with whole car battery electricity through output pre-charge unit, input pre-charge unit has two parallel connection's input pre-charge branch road and input main tributary way, output pre-charge unit has two parallel connection's output pre-charge branch road and output main tributary way. Also discloses a pre-charging starting method of the DCDC converter for the fuel cell automobile. The invention reduces the faults and can play a role of buffering and protecting equipment on the whole automobile system.
Description
Technical Field
The invention belongs to the technical field of fuel cell automobiles, and particularly relates to a pre-charging starting circuit and a pre-charging starting method for a DCDC converter for a fuel cell automobile.
Background
The DCDC converter for the fuel cell automobile is an important part in a power system of the fuel cell automobile, is connected between a hydrogen fuel cell stack and a battery management unit, and has the main function of converting an unadjustable direct-current power supply into an adjustable direct-current power supply, thereby relating to the power performance, the energy utilization efficiency and the reliability of system operation of the whole fuel cell automobile. Currently, the DCDC converter for a fuel cell vehicle is connected and disconnected with the hydrogen fuel cell stack and the cell management unit through a contactor. After the whole fuel cell automobile system is powered on, firstly, the contactor of the DCDC converter on the side of the battery management unit is closed, secondly, the contactor of the DCDC converter on the side of the hydrogen fuel cell stack is closed, and then the DCDC converter starts to operate.
The whole fuel cell automobile system is electrified and operated, a pre-charging process is not carried out when the DCDC converter is started, the fault of contact short circuit is easily caused by large current generated due to large differential pressure on two sides of the contactor in the closing process of the contactor, and the high-voltage equipment hung on the DCDC converter is impacted when being started, so that the equipment can be damaged.
Disclosure of Invention
The invention aims to provide a pre-charging starting circuit and a pre-charging starting method for a DCDC converter for a fuel cell automobile, which reduce faults and can play a role of buffering and protecting equipment on an automobile system.
The embodiment of the invention is realized as follows:
a DCDC converter pre-charge starting circuit for a fuel cell vehicle includes: the system comprises an input pre-charging unit, a DCDC converter, an output pre-charging unit, a fuel cell and a whole vehicle storage battery, wherein the fuel cell is electrically connected with the input end of the DCDC converter through the input pre-charging unit; when the circuit is normal after the output pre-charging branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, the output main branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, and the output pre-charging branch circuit is disconnected; when the input pre-charging branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner and the circuit is normal, the input main branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner, and the input pre-charging branch circuit is disconnected.
The input pre-charging unit is provided with an input pre-charging branch and an input main branch which are connected in parallel, wherein the input pre-charging branch comprises an input pre-charging contactor and an input pre-charging resistor which are connected in series, and the input main branch comprises an input main contactor.
The output pre-charging unit is provided with two output pre-charging branch circuits and an output main branch circuit which are connected in parallel, wherein the output pre-charging branch circuit comprises an output pre-charging contactor and an output pre-charging resistor which are connected in series, and the output main branch circuit comprises an output main contactor.
The two ends of the input pre-charging unit are provided with voltage sampling points, and the two ends of the output pre-charging unit are also provided with voltage sampling points.
And a high-voltage auxiliary interface for externally connecting high-voltage electric equipment is arranged between the output end of the DCDC converter and the output pre-charging unit.
A pre-charging starting method of a DCDC converter for a fuel cell vehicle, the pre-charging starting circuit of the DCDC converter comprises: the system comprises an input pre-charging unit, a DCDC converter, an output pre-charging unit, a fuel cell and a whole vehicle storage battery, wherein the fuel cell is electrically connected with the input end of the DCDC converter through the input pre-charging unit;
when the circuit is normal after the output pre-charging branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, the output main branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, and the output pre-charging branch circuit is disconnected; when the input pre-charging branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner and the circuit is normal, the input main branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner, and the input pre-charging branch circuit is disconnected.
The output pre-charging unit is provided with an output pre-charging branch and an output main branch which are connected in parallel, wherein the output pre-charging branch comprises an output pre-charging contactor and an output pre-charging resistor which are connected in series, and the output main branch comprises an output main contactor; voltage sampling points are arranged at two ends of the output pre-charging unit; when the voltage of the voltage sampling point is normal, the output pre-charging contactor is conducted to connect the output pre-charging branch between the storage battery of the whole vehicle and the DCDC converter in a conducting manner, after the preset time, when the difference value of the voltage sampling points at two ends is less than or equal to the preset safety threshold value, the output main contactor is conducted, and after the preset time, the output pre-charging contactor is disconnected; and outputting failure information of pre-charging failure when the voltage of the voltage sampling point is abnormal or the difference value of the voltage sampling points at two ends is greater than a preset safety threshold value.
The input pre-charging unit is provided with an input pre-charging branch and an input main branch which are connected in parallel, wherein the input pre-charging branch comprises an input pre-charging contactor and an input pre-charging resistor which are connected in series, and the input main branch comprises an input main contactor; voltage sampling points are arranged at two ends of the input pre-charging unit; when the voltage of the voltage sampling point is normal, the input pre-charging contactor is conducted to connect the input pre-charging branch between the fuel cell and the DCDC converter in a conducting manner, after the preset time, when the difference value of the voltage sampling points at two ends is less than or equal to a preset safety threshold value, the input main contactor is conducted, and after the preset time, the input pre-charging contactor is disconnected; and outputting failure information of pre-charging failure when the voltage of the voltage sampling point is abnormal or the difference value of the voltage sampling points at two ends is greater than a preset safety threshold value.
And when the fault information of the pre-charging failure is output, the conduction of all the contactors is disconnected.
The pre-charging circuit and the control process can avoid the adhesion of relay contacts caused by large current due to large voltage difference between two ends of the relay in the power-on process of the whole fuel cell automobile system, reduce faults, and can also avoid high-voltage impact on equipment which is hung on an auxiliary high-voltage port of a DCDC controller in the whole fuel cell automobile system, thereby playing a role in buffering and protecting.
Drawings
Fig. 1 is a schematic diagram of a precharge start circuit of a DCDC converter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention is applied to the technical field of fuel cell automobiles, and relates to a circuit and a method for improving the buffer protection of equipment and devices when a DCDC converter is started.
The following detailed description of specific implementations of the present invention is provided in conjunction with specific embodiments:
a DCDC converter pre-charge starting circuit for a fuel cell vehicle includes: the system comprises an input pre-charging unit, a DCDC converter, an output pre-charging unit, a fuel cell and a whole vehicle storage battery, wherein the fuel cell is electrically connected with the input end of the DCDC converter through the input pre-charging unit; when the circuit is normal after the output pre-charging branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, the output main branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, and the output pre-charging branch circuit is disconnected; when the input pre-charging branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner and the circuit is normal, the input main branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner, and the input pre-charging branch circuit is disconnected.
The input pre-charging unit is provided with an input pre-charging branch and an input main branch which are connected in parallel, wherein the input pre-charging branch comprises an input pre-charging contactor and an input pre-charging resistor which are connected in series, and the input main branch comprises an input main contactor.
The output pre-charging unit is provided with two output pre-charging branch circuits and an output main branch circuit which are connected in parallel, wherein the output pre-charging branch circuit comprises an output pre-charging contactor and an output pre-charging resistor which are connected in series, and the output main branch circuit comprises an output main contactor.
The two ends of the input pre-charging unit are provided with voltage sampling points, and the two ends of the output pre-charging unit are also provided with voltage sampling points.
And a high-voltage auxiliary interface for externally connecting high-voltage electric equipment is arranged between the output end of the DCDC converter and the output pre-charging unit.
A pre-charging starting method of a DCDC converter for a fuel cell vehicle, the pre-charging starting circuit of the DCDC converter comprises: the system comprises an input pre-charging unit, a DCDC converter, an output pre-charging unit, a fuel cell and a whole vehicle storage battery, wherein the fuel cell is electrically connected with the input end of the DCDC converter through the input pre-charging unit;
when the circuit is normal after the output pre-charging branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, the output main branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, and the output pre-charging branch circuit is disconnected; when the input pre-charging branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner and the circuit is normal, the input main branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner, and the input pre-charging branch circuit is disconnected.
The output pre-charging unit is provided with an output pre-charging branch and an output main branch which are connected in parallel, wherein the output pre-charging branch comprises an output pre-charging contactor and an output pre-charging resistor which are connected in series, and the output main branch comprises an output main contactor; voltage sampling points are arranged at two ends of the output pre-charging unit; when the voltage of the voltage sampling point is normal, the output pre-charging contactor is conducted to connect the output pre-charging branch between the storage battery of the whole vehicle and the DCDC converter in a conducting manner, after the preset time, when the difference value of the voltage sampling points at two ends is less than or equal to the preset safety threshold value, the output main contactor is conducted, and after the preset time, the output pre-charging contactor is disconnected; and outputting failure information of pre-charging failure when the voltage of the voltage sampling point is abnormal or the difference value of the voltage sampling points at two ends is greater than a preset safety threshold value.
The input pre-charging unit is provided with an input pre-charging branch and an input main branch which are connected in parallel, wherein the input pre-charging branch comprises an input pre-charging contactor and an input pre-charging resistor which are connected in series, and the input main branch comprises an input main contactor; voltage sampling points are arranged at two ends of the input pre-charging unit; when the voltage of the voltage sampling point is normal, the input pre-charging contactor is conducted to connect the input pre-charging branch between the fuel cell and the DCDC converter in a conducting manner, after the preset time, when the difference value of the voltage sampling points at two ends is less than or equal to a preset safety threshold value, the input main contactor is conducted, and after the preset time, the input pre-charging contactor is disconnected; and outputting failure information of pre-charging failure when the voltage of the voltage sampling point is abnormal or the difference value of the voltage sampling points at two ends is greater than a preset safety threshold value.
And when the fault information of the pre-charging failure is output, the conduction of all the contactors is disconnected.
As shown in fig. 1, a DCDC converter pre-charge starting circuit for a Fuel cell vehicle includes an input pre-charge unit, an output pre-charge unit, and a high-voltage auxiliary interface, where the input pre-charge unit includes voltage acquisition of a Fuel cell (Fuel cell stack) and switching actions of an input pre-charge contactor and an input main contactor, the output pre-charge unit includes voltage acquisition of a battery of the vehicle, switching actions of an output pre-charge contactor and an output main contactor, and the high-voltage auxiliary interface is an external high-voltage electric device.
The input pre-charging unit comprises a voltage sample Ui1, a voltage sample Ui2, a resistor R2 (input pre-charging resistor), a relay KA3 (input pre-charging contactor) and a relay KA4 (input main contactor); the output pre-charging unit comprises a voltage sampling Uo1, a voltage sampling Uo2, a resistor R1 (output pre-charging resistor), a relay KA1 (output pre-charging contactor), and a relay KA2 (output main contactor), and the high-voltage auxiliary interface comprises AUX + and AUX-ports.
The relay KA3 is parallelly connected with relay KA4 after establishing ties with resistance R2, relay KA4 one end connects voltage sampling port Ui1, another termination voltage sampling port Ui2, relay KA1 is parallelly connected with relay KA2 after establishing ties with resistance R1, relay KA2 one end connects voltage sampling port UO1, another termination voltage sampling port UO2, voltage sampling port UO1 is received to high-pressure auxiliary interface AUX +, AUX-receives lithium cell (whole car battery) interface negative terminal.
The pre-charging starting method flow of the DCDC converter comprises the following steps: after the whole fuel cell automobile system is electrified, firstly, an output pre-charging unit is executed, the voltage Uout2 of the voltage sampling port Uo2 is sampled at T1, if the Uout2 is in the range of normal voltage starting of the equipment, the relay KA1 is closed, and if the Uout2 is not in the range of normal voltage starting of the equipment, the vehicle is stopped, and the fault is reported to the whole vehicle controller. After the relay KA1 is normally closed, after a period of time, sampling the voltage Uout1 of the voltage sampling port Uo1 and the voltage Uout2 of the voltage sampling port Uo2 at a time T2 (the time T is (T2-T1) is different according to different settings of external equipment of the high-voltage auxiliary port), comparing the sizes of the Uout1 and the Uout2 at the time T3, closing the relay KA2 when the difference between the Uout1 and the Uout2 is smaller than a set safety threshold, opening the relay KA1 at the time T4, and if the difference between the Uout1 and the Uout2 is larger than the set safety threshold, considering that output pre-charging fails, opening all relays and reporting a fault to a whole vehicle controller. When the output pre-charging unit is normally executed, the input pre-charging unit is continuously executed, the voltage Uin1 of the voltage sampling port Ui1 is sampled at the time of T5, if the Uin1 is in the range of normal voltage starting of the equipment, the relay KA3 is closed, and if the Uin1 is not in the range of normal voltage starting of the equipment, the equipment is stopped, and faults are reported to the whole vehicle controller. After the relay KA3 is normally closed, after a period of time, at the time T6, sampling of the voltage Uin1 of the voltage sampling port Ui1 and the voltage Uin2 of the voltage sampling port Ui2 is started, at the time T7, the sizes of the Uin1 and the Uin2 are compared, when the difference value between the Uin1 and the Uin2 is smaller than a set safety threshold value, the relay KA4 is closed, the relay KA3 is opened at the time T8, if the difference value between the Uin1 and the Uin2 is larger than the set safety threshold value, input pre-charging is considered to be failed, all relays are opened, and faults are reported to a whole vehicle controller. After input pre-charging is finished, whether the sizes of Uin2 and Uout1 are within a voltage range of normal starting of the DCDC converter is judged, if yes, pre-charging of the whole machine is finished, if not, pre-charging of the whole machine fails, all relays are disconnected, and faults are reported to a whole vehicle controller.
The pre-charging circuit and the control process can avoid the adhesion of relay contacts caused by large current due to large voltage difference between two ends of the relay in the power-on process of the whole fuel cell automobile system, reduce faults, and can also avoid high-voltage impact on equipment which is hung on an auxiliary high-voltage port of a DCDC controller in the whole fuel cell automobile system, thereby playing a role in buffering and protecting.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A DCDC converter pre-charging start-up circuit for a fuel cell vehicle is characterized by comprising: the system comprises an input pre-charging unit, a DCDC converter, an output pre-charging unit, a fuel cell and a whole vehicle storage battery, wherein the fuel cell is electrically connected with the input end of the DCDC converter through the input pre-charging unit; when the circuit is normal after the output pre-charging branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, the output main branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, and the output pre-charging branch circuit is disconnected; when the input pre-charging branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner and the circuit is normal, the input main branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner, and the input pre-charging branch circuit is disconnected.
2. The pre-charging start-up circuit of the DCDC converter for the fuel cell vehicle according to claim 1, characterized in that: the input pre-charging unit is provided with an input pre-charging branch and an input main branch which are connected in parallel, wherein the input pre-charging branch comprises an input pre-charging contactor and an input pre-charging resistor which are connected in series, and the input main branch comprises an input main contactor.
3. The pre-charging start-up circuit of the DCDC converter for the fuel cell vehicle according to claim 1, characterized in that: the output pre-charging unit is provided with two output pre-charging branch circuits and an output main branch circuit which are connected in parallel, wherein the output pre-charging branch circuit comprises an output pre-charging contactor and an output pre-charging resistor which are connected in series, and the output main branch circuit comprises an output main contactor.
4. The pre-charging start-up circuit of the DCDC converter for the fuel cell vehicle according to claim 1, characterized in that: the two ends of the input pre-charging unit are provided with voltage sampling points, and the two ends of the output pre-charging unit are also provided with voltage sampling points.
5. The pre-charging start-up circuit of the DCDC converter for the fuel cell vehicle according to claim 1, characterized in that: and a high-voltage auxiliary interface for externally connecting high-voltage electric equipment is arranged between the output end of the DCDC converter and the output pre-charging unit.
6. A pre-charging starting method of a DCDC converter for a fuel cell vehicle is characterized in that a pre-charging starting circuit of the DCDC converter comprises the following steps: the system comprises an input pre-charging unit, a DCDC converter, an output pre-charging unit, a fuel cell and a whole vehicle storage battery, wherein the fuel cell is electrically connected with the input end of the DCDC converter through the input pre-charging unit;
when the circuit is normal after the output pre-charging branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, the output main branch circuit is connected between the finished automobile storage battery and the DCDC converter in a conduction mode, and the output pre-charging branch circuit is disconnected; when the input pre-charging branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner and the circuit is normal, the input main branch circuit is connected between the fuel cell and the DCDC converter in a conducting manner, and the input pre-charging branch circuit is disconnected.
7. The method for precharging the DCDC converter for the fuel cell vehicle according to claim 6, wherein: the output pre-charging unit is provided with an output pre-charging branch and an output main branch which are connected in parallel, wherein the output pre-charging branch comprises an output pre-charging contactor and an output pre-charging resistor which are connected in series, and the output main branch comprises an output main contactor; voltage sampling points are arranged at two ends of the output pre-charging unit; when the voltage of the voltage sampling point is normal, the output pre-charging contactor is conducted to connect the output pre-charging branch between the storage battery of the whole vehicle and the DCDC converter in a conducting manner, after the preset time, when the difference value of the voltage sampling points at two ends is less than or equal to the preset safety threshold value, the output main contactor is conducted, and after the preset time, the output pre-charging contactor is disconnected; and outputting failure information of pre-charging failure when the voltage of the voltage sampling point is abnormal or the difference value of the voltage sampling points at two ends is greater than a preset safety threshold value.
8. The method for precharging the DCDC converter for the fuel cell vehicle according to claim 6, wherein: the input pre-charging unit is provided with an input pre-charging branch and an input main branch which are connected in parallel, wherein the input pre-charging branch comprises an input pre-charging contactor and an input pre-charging resistor which are connected in series, and the input main branch comprises an input main contactor; voltage sampling points are arranged at two ends of the input pre-charging unit; when the voltage of the voltage sampling point is normal, the input pre-charging contactor is conducted to connect the input pre-charging branch between the fuel cell and the DCDC converter in a conducting manner, after the preset time, when the difference value of the voltage sampling points at two ends is less than or equal to a preset safety threshold value, the input main contactor is conducted, and after the preset time, the input pre-charging contactor is disconnected; and outputting failure information of pre-charging failure when the voltage of the voltage sampling point is abnormal or the difference value of the voltage sampling points at two ends is greater than a preset safety threshold value.
9. The pre-charge starting method of the DCDC converter for the fuel cell vehicle according to claim 7 or 8, characterized in that: and when the fault information of the pre-charging failure is output, the conduction of all the contactors is disconnected.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884200A (en) * | 2020-08-26 | 2020-11-03 | 华中科技大学 | Automatic switching circuit and method for two-way direct-current input power supply of power electronic converter |
| CN113246802A (en) * | 2021-06-21 | 2021-08-13 | 潍柴动力股份有限公司 | Control method and device of high-voltage system, electronic equipment and storage medium |
| CN113777986A (en) * | 2021-09-09 | 2021-12-10 | 北京氢沄新能源科技有限公司 | High-voltage controller and vehicle |
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| CN113777986A (en) * | 2021-09-09 | 2021-12-10 | 北京氢沄新能源科技有限公司 | High-voltage controller and vehicle |
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