CN111497686A - Fuel cell power supply system and vehicle using same - Google Patents
Fuel cell power supply system and vehicle using same Download PDFInfo
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- CN111497686A CN111497686A CN201910092841.2A CN201910092841A CN111497686A CN 111497686 A CN111497686 A CN 111497686A CN 201910092841 A CN201910092841 A CN 201910092841A CN 111497686 A CN111497686 A CN 111497686A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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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)
- Fuel Cell (AREA)
Abstract
The invention provides a fuel cell power supply system and a vehicle using the same, wherein a motor in a hydrogen circulating pump is connected with a first power supply module, a motor in a cooling water pump is connected with a second power supply module, the first power supply module comprises a first inverter and/or the second power supply module comprises a second inverter, direct current of a fuel cell is boosted by a boosting DC/DC converter to obtain high-voltage direct current, the high-voltage direct current is converted into alternating current by the first inverter and/or the second inverter, the variable frequency speed regulation of the motor in the hydrogen circulating pump and the variable frequency speed regulation of the motor in the cooling water pump are regulated by changing the frequency, the requirements of different conditions are met, and the vehicle is good in applicability.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a fuel cell power supply system and a vehicle using the same.
Background
The fuel cell vehicle is a vehicle using electric power generated by a vehicle-mounted fuel cell device as power, and has high energy conversion efficiency, no noise and little pollution. In the existing scheme, a fuel cell system air compressor controller cannot directly adopt high-voltage power supply, needs to use the high-voltage power after first-level voltage reduction through a voltage reduction DC/DC converter, a hydrogen circulating pump and a cooling water pump adopt 24V products, and needs to use the high-voltage power after first-level isolation voltage reduction to 24V through a 24VDC/DC converter, as shown in figure 1. In order to meet the requirements of different working conditions or environments, under the common condition, the hydrogen circulating pump or the cooling water pump needs to be regulated according to different working conditions or environments so as to meet the requirement of flow. However, the motor in the current hydrogen circulating pump and the motor in the cooling water pump are direct current motor, and direct low pressure direct current power supply that adopts, so, just can't carry out effective speed governing to direct current motor, can't effectively adjust hydrogen circulating pump or cooling water pump's rotational speed promptly, and the control flexibility of hydrogen circulating pump or cooling water pump is lower, and the suitability is relatively poor, can't satisfy the demand of different situation.
Disclosure of Invention
The invention aims to provide a fuel cell power supply system, which is used for solving the problem of poor applicability caused by the fact that the power supply mode of a hydrogen circulating pump or a cooling water pump in the prior art cannot effectively regulate the speed of the hydrogen circulating pump or the cooling water pump according to actual needs; the utility model also provides a vehicle of using fuel cell power supply system simultaneously for solve the poor problem of fuel cell vehicle suitability among the prior art.
In order to achieve the above object, the present invention provides a fuel cell power supply system, which includes a fuel cell, a boost DC/DC converter, and a system accessory power supply subsystem, where the system accessory power supply subsystem includes a hydrogen circulation pump power supply subsystem and a cooling water pump power supply subsystem, the hydrogen circulation pump power supply subsystem includes a hydrogen circulation pump and a first power supply module for supplying power to a motor in the hydrogen circulation pump, and the cooling water pump power supply subsystem includes a cooling water pump and a second power supply module for supplying power to a motor in the cooling water pump; the electric energy output end of the fuel cell is connected with the low-voltage side of the boost DC/DC converter, the first power supply module comprises a first inverter and/or the second power supply module comprises a second inverter, the direct-current side of the first inverter is used for being connected with the high-voltage side of the boost DC/DC converter, and the alternating-current side of the first inverter is connected with a motor in a hydrogen circulating pump; the direct current side of the second inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating current side of the second inverter is connected with a motor in a cooling water pump.
The invention has the beneficial effects that: according to the invention, the motor in the hydrogen circulating pump is connected with the first power supply module, the motor in the cooling water pump is connected with the second power supply module, the first power supply module comprises the first inverter and/or the second power supply module comprises the second inverter, the direct current of the fuel cell is boosted by the boosting DC/DC converter to obtain the direct current, the direct current can be converted into the alternating current by the first inverter, the variable frequency speed regulation of the motor in the hydrogen circulating pump can be realized by adjusting the frequency of the alternating current, and the inverter has higher reliability and flexibility, so that the inverter can realize the effective and reliable speed regulation of the hydrogen circulating pump, has higher control flexibility and applicability, and meets the requirements of different conditions. Or can be the alternating current with direct current conversion through first dc-to-ac converter, so just can realize the variable frequency speed governing of the motor among the hydrogen circulating pump through the frequency of adjusting the alternating current, because variable frequency speed governing's reliability and flexibility are higher, consequently, can realize the effective reliable speed governing of hydrogen circulating pump through this dc-to-ac converter, control flexibility and suitability are higher, satisfy the demand of different situation.
Further, the first power supply module further comprises a first step-down DC/DC converter, the DC side of the first inverter is connected to the low-voltage side of the first step-down DC/DC converter, and the high-voltage side of the first step-down DC/DC converter is connected to the high-voltage side of the step-up DC/DC converter; the second power supply module further comprises a second step-down DC/DC converter, the direct current side of the second inverter is connected with the low voltage side of the second step-down DC/DC converter, and the high voltage side of the second step-down DC/DC converter is connected with the high voltage side of the boost DC/DC converter. The direct current side of the inverter is low-voltage direct current converted by the step-down DC/DC converter, so that a switching device in the inverter does not need to require high-voltage withstand voltage level, the universality of the type selection of the switching device in the inverter is improved, the reliability and the safety of the operation of the inverter are improved, and the power supply reliability and the safety of a system are further improved.
In order to improve the voltage conversion efficiency of the first step-down DC/DC converter and/or the second step-down DC/DC converter, the first step-down DC/DC converter and/or the second step-down DC/DC converter includes a first power conversion unit, an isolation transformer, and a second power conversion unit, which are connected in this order.
Further, the first power conversion unit comprises a capacitor C1, a switching tube Q1 and a switching tube Q2, the capacitor C1, the switching tube Q2 and the switching tube Q1 are sequentially connected in series to form a series branch, two ends of the series branch are high-voltage sides of the corresponding step-down DC/DC converter, and a series circuit formed by the capacitor C1 and the switching tube Q2 is connected in parallel with a primary winding of the isolation transformer. The first electric energy conversion unit has a simple structure, is easy to realize, and can improve the voltage conversion efficiency of the first step-down DC/DC converter and/or the second step-down DC/DC converter.
The second electric energy conversion unit comprises an inductor L1, a switch tube Q3, a switch tube Q4 and a capacitor Co, a middle tap is arranged in a secondary winding of the isolation transformer, the middle tap is connected with one end of the inductor L1, the other end of the inductor L1 forms a contact corresponding to the low-voltage side of the step-down DC/DC converter, one end of the secondary winding of the isolation transformer is connected with one end of the switch tube Q3, the other end of the secondary winding of the isolation transformer is connected with one end of the switch tube Q4, the other end of the switch tube Q3 and the other end of the switch tube Q4 are connected to form another contact corresponding to the low-voltage side of the step-down DC/DC converter, and the capacitor Co is arranged on the low-voltage side of the step-down DC/DC converter.
Further, a motor in the hydrogen circulating pump and a motor in the cooling water pump are both brushless direct current motors, and the alternating current side of the first inverter is connected with a stator winding of the brushless direct current motor in the hydrogen circulating pump; and the alternating current side of the second inverter is connected with a stator winding of a brushless direct current motor in the cooling water pump. The brushless direct current motor is adopted to realize frequency conversion speed regulation and speed regulation reliability.
Further, the fuel cell power supply system further comprises a power battery, wherein the power battery is connected with the high-voltage side of the boosting DC/DC converter; the system accessory power supply subsystem further comprises an air compressor power supply subsystem, the air compressor power supply subsystem comprises an air compressor controller and a third step-down DC/DC converter, the high-voltage side of the third step-down DC/DC converter is connected with the high-voltage side of the boosting DC/DC converter, the low-voltage side of the third step-down DC/DC converter is connected with the air compressor controller, and the air compressor controller is used for controlling an air compressor. When the fuel cell is short of power supply, the power cell supplies power to the motor in the hydrogen circulating pump, the motor in the cooling water pump and the air compressor.
The invention also provides a vehicle using the fuel cell power supply system, which comprises a vehicle body and the fuel cell power supply system, wherein the fuel cell power supply system comprises a fuel cell, a boost DC/DC converter and a system accessory power supply subsystem, the system accessory power supply subsystem comprises a hydrogen circulating pump power supply subsystem and a cooling water pump power supply subsystem, the hydrogen circulating pump power supply subsystem comprises a hydrogen circulating pump and a first power supply module for supplying power to a motor in the hydrogen circulating pump, and the cooling water pump power supply subsystem comprises a cooling water pump and a second power supply module for supplying power to the motor in the cooling water pump; the electric energy output end of the fuel cell is connected with the low-voltage side of the boost DC/DC converter, the first power supply module comprises a first inverter and/or the second power supply module comprises a second inverter, the direct-current side of the first inverter is used for being connected with the high-voltage side of the boost DC/DC converter, and the alternating-current side of the first inverter is connected with a motor in a hydrogen circulating pump; the second power supply module comprises a second inverter, the direct current side of the second inverter is used for being connected with the high-voltage side of the boost DC/DC converter, and the alternating current side of the second inverter is connected with a motor in a cooling water pump.
The invention has the beneficial effects that: according to the invention, the motor in the hydrogen circulating pump is connected with the first power supply module, the motor in the cooling water pump is connected with the second power supply module, the first power supply module comprises the first inverter and/or the second power supply module comprises the second inverter, the direct current of the fuel cell is boosted by the boosting DC/DC converter to obtain the direct current, the direct current can be converted into the alternating current by the first inverter, the variable frequency speed regulation of the motor in the hydrogen circulating pump can be realized by adjusting the frequency of the alternating current, and the inverter has higher reliability and flexibility, so that the inverter can realize the effective and reliable speed regulation of the hydrogen circulating pump, has higher control flexibility and applicability, and meets the requirements of different conditions. Or can be the alternating current with direct current conversion through first dc-to-ac converter, so just can realize the variable frequency speed governing of the motor among the hydrogen circulating pump through the frequency of adjusting the alternating current, because variable frequency speed governing's reliability and flexibility are higher, consequently, can realize the effective reliable speed governing of hydrogen circulating pump through this dc-to-ac converter, control flexibility and suitability are higher, satisfy the demand of different situation.
Further, the first power supply module further comprises a first step-down DC/DC converter, the DC side of the first inverter is connected to the low-voltage side of the first step-down DC/DC converter, and the high-voltage side of the first step-down DC/DC converter is connected to the high-voltage side of the step-up DC/DC converter; the second power supply module further comprises a second step-down DC/DC converter, the direct current side of the second inverter is connected with the low voltage side of the second step-down DC/DC converter, and the high voltage side of the second step-down DC/DC converter is connected with the high voltage side of the boost DC/DC converter. The direct current side of the inverter is low-voltage direct current converted by the step-down DC/DC converter, so that a switching device in the inverter does not need to require high-voltage withstand voltage level, the universality of the type selection of the switching device in the inverter is improved, the reliability and the safety of the operation of the inverter are improved, and the power supply reliability and the safety of a system are further improved.
In order to improve the voltage conversion efficiency of the first step-down DC/DC converter and/or the second step-down DC/DC converter, the first step-down DC/DC converter and/or the second step-down DC/DC converter includes a first power conversion unit, an isolation transformer, and a second power conversion unit, which are connected in this order.
Further, the first power conversion unit comprises a capacitor C1, a switching tube Q1 and a switching tube Q2, the capacitor C1, the switching tube Q2 and the switching tube Q1 are sequentially connected in series to form a series branch, two ends of the series branch are high-voltage sides of the corresponding step-down DC/DC converter, and a series circuit formed by the capacitor C1 and the switching tube Q2 is connected in parallel with a primary winding of the isolation transformer. The first electric energy conversion unit has a simple structure, is easy to realize, and can improve the voltage conversion efficiency of the first step-down DC/DC converter and/or the second step-down DC/DC converter.
The second electric energy conversion unit comprises an inductor L1, a switch tube Q3, a switch tube Q4 and a capacitor Co, a middle tap is arranged in a secondary winding of the isolation transformer, the middle tap is connected with one end of the inductor L1, the other end of the inductor L1 forms a contact corresponding to the low-voltage side of the step-down DC/DC converter, one end of the secondary winding of the isolation transformer is connected with one end of the switch tube Q3, the other end of the secondary winding of the isolation transformer is connected with one end of the switch tube Q4, the other end of the switch tube Q3 and the other end of the switch tube Q4 are connected to form another contact corresponding to the low-voltage side of the step-down DC/DC converter, and the capacitor Co is arranged on the low-voltage side of the step-down DC/DC converter.
Further, a motor in the hydrogen circulating pump and a motor in the cooling water pump are both brushless direct current motors, and the alternating current side of the first inverter is connected with a stator winding of the brushless direct current motor in the hydrogen circulating pump; and the alternating current side of the second inverter is connected with a stator winding of a brushless direct current motor in the cooling water pump. The brushless direct current motor is adopted to realize frequency conversion speed regulation and speed regulation reliability.
Further, the fuel cell power supply system further comprises a power battery, wherein the power battery is connected with the high-voltage side of the boosting DC/DC converter; the system accessory power supply subsystem further comprises an air compressor power supply subsystem, the air compressor power supply subsystem comprises an air compressor controller and a third step-down DC/DC converter, the high-voltage side of the third step-down DC/DC converter is connected with the high-voltage side of the boosting DC/DC converter, the low-voltage side of the third step-down DC/DC converter is connected with the air compressor controller, and the air compressor controller is used for controlling an air compressor. When the fuel cell is short of power supply, the power cell supplies power to the motor in the hydrogen circulating pump, the motor in the cooling water pump and the air compressor.
Drawings
FIG. 1 is a block diagram of a prior art fuel cell power supply system;
fig. 2 is a power supply principle diagram of the fuel cell power supply system of the present invention;
fig. 3 is a schematic diagram of the inverter according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
fuel cell power system embodiments:
the invention provides a fuel cell power supply system which comprises a fuel cell, a boosting DC/DC converter and a system accessory power supply subsystem, wherein the system accessory power supply subsystem comprises a hydrogen circulating pump power supply subsystem and a cooling water pump power supply subsystem; the electric energy output end of the fuel cell is connected with the low-voltage side of the boosting DC/DC converter. The first power supply module comprises a first inverter, the direct current side of the first inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating current side of the first inverter is connected with a motor in the hydrogen circulating pump; the second power supply module comprises a second inverter, the direct current side of the second inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, the alternating current side of the second inverter is connected with a motor in the cooling water pump, as shown in fig. 3, the direct current side of the first inverter or the direct current side of the second inverter is directly connected with the high-voltage power supply platform, and the alternating voltage obtained after conversion by the inverter is subjected to frequency conversion and speed regulation on the hydrogen circulating pump or the motor in the cooling water pump, so that the requirements of cooling water flow and hydrogen circulation rate of the fuel cell power supply system are met. The high-voltage power supply is adopted, the number of electrical connection points of the fuel cell power supply system is reduced, the safety of the fuel cell power supply system is improved, the number of parts is reduced, the size is reduced, the cost is saved, and the power density of the fuel cell power supply system is improved.
In this embodiment, the variable frequency speed regulation of the motor in the hydrogen circulation pump or the motor in the cooling water pump is realized, and as another embodiment, if the variable frequency speed regulation is only performed on the motor in the hydrogen circulation pump, the first power supply module includes the first inverter, and the second power supply module does not include the second inverter; or if only the motor in the cooling water pump is subjected to variable frequency speed regulation, the first power supply module does not comprise the first inverter, and the second power supply module comprises the second inverter.
If the motor in the hydrogen circulation pump or the motor in the cooling water pump supplies power at a low voltage, as shown in fig. 2, the first power supply module further includes a first step-down DC/DC converter, a direct-current side of the first inverter is connected to a low-voltage side of the first step-down DC/DC converter, and a high-voltage side of the first step-down DC/DC converter is connected to a high-voltage side of the step-up DC/DC converter; the second power supply module further comprises a second buck DC/DC converter, the direct current side of the second inverter is connected with the low voltage side of the second buck DC/DC converter, and the high voltage side of the second buck DC/DC converter is connected with the high voltage side of the boost DC/DC converter.
As another embodiment, if the voltage levels of the motor in the hydrogen circulation pump and the motor in the cooling water pump are the same, the motor in the hydrogen circulation pump and the motor in the cooling water pump may share one step-down DC/DC converter.
The first voltage reduction DC/DC converter and the second DC/DC converter are both 24VDC/DC converters, and convert the direct current of the fuel cell into 24V to supply power for the hydrogen circulating pump and the cooling water pump, so that the requirements of the cooling water flow rate and the hydrogen circulating rate of the fuel cell power supply system are met. The first step-down DC/DC converter and the second step-down DC/DC converter both adopt an active clamping forward circuit topological structure in the prior art, and the inverter adopts a full-wave rectification and synchronous rectification mixed technology, so that the power conversion efficiency is improved. As for the specific structure of the first step-down DC/DC converter and the second step-down DC/DC converter, as shown in fig. 2, the structure of the first step-down DC/DC converter and the second step-down DC/DC converter is the same, and in the case of the first step-down DC/DC converter, the first step-down DC/DC converter includes a first power conversion unit, an isolation transformer, and a second power conversion unit, which are connected in sequence.
The first electric energy conversion unit comprises a capacitor C1, a switching tube Q1 and a switching tube Q2, the capacitor C1, the switching tube Q2 and the switching tube Q1 are sequentially connected in series to form a series branch, two ends of the series branch are high-voltage sides of the corresponding step-down DC/DC converter, and a series circuit formed by the capacitor C1 and the switching tube Q2 is connected with a primary winding of the isolation transformer in parallel.
The second power conversion unit includes an inductor L, a switch Q3, a switch Q4 and a capacitor Co, wherein a middle tap is arranged in a secondary winding of the isolation transformer, the middle tap is connected with one end of an inductor L, the other end of the inductor L forms a contact corresponding to the low-voltage side of the buck DC/DC converter, one end of the secondary winding of the isolation transformer is connected with one end of a switch Q3, the other end of the secondary winding of the isolation transformer is connected with one end of a switch Q4, the other end of the switch Q3 and the other end of the switch Q4 are connected to form another contact corresponding to the low-voltage side of the buck DC/DC converter, the capacitor Co is arranged on the low-voltage side of the first buck DC/DC converter, the low-voltage side of the first buck DC/DC converter is connected with the direct-current side of the first inverter, the alternating-current side of the first inverter is connected with the motor in the hydrogen circulation pump, M in fig. 2 is the motor in the hydrogen circulation pump, and similarly, since the structures of the second buck DC/DC converter and the first buck DC converter are the switch Q3 and the switch Q4.
The working principle of the first step-down DC/DC converter is as follows: when the switching tube Q1 is conducted, power is coupled to the output end through the isolation transformer, and at the moment, the switching tube Q3 is conducted synchronously to transmit energy to the load end; when the switching tube Q2 is conducted, the magnetic reset is carried out on the isolation transformer, the excitation energy and the leakage inductance energy can be fed back to the input end through a line, and at the moment, the switching tube Q4 is conducted synchronously to output energy to the outside. Since the specific working process is the prior art, detailed description is omitted here. Likewise, the same is true of the operating principle of the second step-down DC/DC converter.
The first step-down DC/DC converter and the second step-down DC/DC converter of the present embodiment each include a first power conversion unit, an isolation transformer, and a second power conversion unit. As other embodiments, the corresponding first step-down DC/DC converter may include the first power conversion unit, the isolation transformer, and the second power conversion unit, while the second step-down DC/DC converter does not include the first power conversion unit, the isolation transformer, and the second power conversion unit, and may be other DC/DC conversion circuit, such as no isolation transformer; alternatively, the first step-down DC/DC converter does not include the first power conversion unit, the isolation transformer, and the second power conversion unit, and may be another DC/DC conversion circuit, for example, the isolation transformer is not provided, and the second step-down DC/DC converter includes the first power conversion unit, the isolation transformer, and the second power conversion unit.
In this embodiment, both the motor in the hydrogen circulation pump and the motor in the cooling water pump are brushless dc motors, and the ac side of the first inverter is connected to the stator winding of the brushless dc motor in the hydrogen circulation pump; and the alternating current side of the second inverter is connected with a stator winding of the brushless direct current motor in the cooling water pump, so that the first inverter and the second inverter are a three-phase full-bridge inverter circuit. As another embodiment, the motor in the hydrogen circulation pump and the motor in the cooling water pump may also be ac motors, such as permanent magnet synchronous motors, as long as the variable frequency speed control is achieved, and specifically, the brushless dc motor is a three-phase brushless dc motor.
If the power supply of the fuel cell is insufficient, the operation of a motor in a hydrogen circulating pump or a motor in a cooling water pump is influenced, therefore, the fuel cell power supply system further comprises a power cell, the power cell is connected with the high-pressure side of the boosting DC/DC converter, the high-pressure side of the first step-down DC/DC converter is connected with the high-pressure side of the boosting DC/DC converter, the high-pressure side of the second step-down DC/DC converter is connected with the high-pressure side of the boosting DC/DC converter, the low-pressure side of the first step-down DC/DC converter is sequentially connected with a first inverter and the motor in the hydrogen circulating pump, and the low-pressure side of the second step-down DC/DC converter is sequentially connected with the motors in the second; the high-voltage direct current of the power battery correspondingly obtains low-voltage alternating current through the first step-down DC/DC converter, the first inverter, the second step-down DC/DC converter and the second inverter, and correspondingly adjusts the speed of the motor in the hydrogen circulating pump and the speed of the motor in the cooling water pump.
The system accessory power supply subsystem further comprises an air compressor power supply subsystem, the air compressor power supply subsystem comprises an air compressor controller and a third step-down DC/DC converter, the high-voltage side of the third step-down DC/DC converter is connected with the high-voltage side of the step-up DC/DC converter, the low-voltage side of the third step-down DC/DC converter is connected with an air compressor controller, voltage obtained by correspondingly converting a fuel cell or a power cell is input to the air compressor controller, and the air compressor controller is used for controlling an air compressor.
The embodiment of the vehicle is as follows:
the invention also provides a vehicle using the fuel cell power supply system, which comprises a vehicle body and the fuel cell power supply system, wherein the fuel cell power supply system comprises a fuel cell, a boosting DC/DC converter and a system accessory power supply subsystem, the system accessory power supply subsystem comprises a hydrogen circulating pump power supply subsystem and a cooling water pump power supply subsystem, the hydrogen circulating pump power supply subsystem comprises a hydrogen circulating pump and a first power supply module used for supplying power to a motor in the hydrogen circulating pump, and the cooling water pump power supply subsystem comprises a cooling water pump and a second power supply module used for supplying power to the motor in the cooling water pump; the electric energy output end of the fuel cell is connected with the low-voltage side of the boosting DC/DC converter, the first power supply module comprises a first inverter and/or the second power supply module comprises a second inverter, the direct-current side of the first inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating-current side of the first inverter is connected with a motor in the hydrogen circulating pump; the second power supply module comprises a second inverter, the direct current side of the second inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating current side of the second inverter is connected with a motor in the cooling water pump. Since the detailed description of the specific process of converting the dc power of the fuel cell into the ac power and the related hardware structure have been given in the embodiments of the fuel cell power supply system, they are not described herein again.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (10)
1. A fuel cell power supply system comprises a fuel cell, a boost DC/DC converter and a system accessory power supply subsystem, wherein the system accessory power supply subsystem comprises a hydrogen circulating pump power supply subsystem and a cooling water pump power supply subsystem, the hydrogen circulating pump power supply subsystem comprises a hydrogen circulating pump and a first power supply module used for supplying power to a motor in the hydrogen circulating pump, and the cooling water pump power supply subsystem comprises a cooling water pump and a second power supply module used for supplying power to the motor in the cooling water pump; the electric energy output end of the fuel cell is connected with the low-voltage side of the boosting DC/DC converter, the first power supply module comprises a first inverter and/or the second power supply module comprises a second inverter, the direct-current side of the first inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating-current side of the first inverter is connected with a motor in a hydrogen circulating pump; the direct current side of the second inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating current side of the second inverter is connected with a motor in a cooling water pump.
2. The fuel cell power supply system according to claim 1, wherein the first power supply module further includes a first step-down DC/DC converter, a direct-current side of the first inverter is connected to a low-voltage side of the first step-down DC/DC converter, and a high-voltage side of the first step-down DC/DC converter is connected to a high-voltage side of the step-up DC/DC converter; the second power supply module further comprises a second step-down DC/DC converter, the direct current side of the second inverter is connected with the low voltage side of the second step-down DC/DC converter, and the high voltage side of the second step-down DC/DC converter is connected with the high voltage side of the boost DC/DC converter.
3. The fuel cell power supply system according to claim 2, wherein the first step-down DC/DC converter and/or the second step-down DC/DC converter includes a first power conversion unit, an isolation transformer, and a second power conversion unit connected in this order.
4. The fuel cell power supply system of claim 3, wherein the first power conversion unit comprises a capacitor C1, a switch tube Q1 and a switch tube Q2, the capacitor C1, the switch tube Q2 and the switch tube Q1 are sequentially connected in series to form a series branch, two ends of the series branch are the high-voltage side of the corresponding step-down DC/DC converter, and the series circuit formed by the capacitor C1 and the switch tube Q2 is connected in parallel with the primary winding of the isolation transformer.
5. The fuel cell power supply system according to claim 3 or 4, wherein the second power conversion unit includes an inductor L1, a switch tube Q3, a switch tube Q4 and a capacitor Co, a center tap is provided in a secondary winding of the isolation transformer, the center tap is connected to one end of the inductor L1, the other end of the inductor L1 forms a contact corresponding to the low voltage side of the step-down DC/DC converter, one end of the secondary winding of the isolation transformer is connected to one end of the switch tube Q3, the other end of the secondary winding of the isolation transformer is connected to one end of the switch tube Q4, the other end of the switch tube Q3 and the other end of the switch tube Q4 are connected to form another contact corresponding to the low voltage side of the step-down DC/DC converter, and the capacitor Co is provided at the low voltage side of the step-down DC/DC converter.
6. The fuel cell power supply system according to claim 2, 3 or 4, wherein the motor in the hydrogen circulation pump and the motor in the cooling water pump are both brushless direct current motors, and the alternating current side of the first inverter is connected to a stator winding of the brushless direct current motor in the hydrogen circulation pump; and the alternating current side of the second inverter is connected with a stator winding of a brushless direct current motor in the cooling water pump.
7. The fuel cell power supply system according to claim 1, further comprising a power cell connected to a high-voltage side of the step-up DC/DC converter; the system accessory power supply subsystem further comprises an air compressor power supply subsystem, the air compressor power supply subsystem comprises an air compressor controller and a third step-down DC/DC converter, the high-voltage side of the third step-down DC/DC converter is connected with the high-voltage side of the boosting DC/DC converter, the low-voltage side of the third step-down DC/DC converter is connected with the air compressor controller, and the air compressor controller is used for controlling an air compressor.
8. A vehicle comprises a vehicle body and a fuel cell power supply system, wherein the fuel cell power supply system comprises a fuel cell, a boost DC/DC converter and a system accessory power supply subsystem, the system accessory power supply subsystem comprises a hydrogen circulating pump power supply subsystem and a cooling water pump power supply subsystem, the hydrogen circulating pump power supply subsystem comprises a hydrogen circulating pump and a first power supply module for supplying power to a motor in the hydrogen circulating pump, and the cooling water pump power supply subsystem comprises a cooling water pump and a second power supply module for supplying power to the motor in the cooling water pump; the electric energy output end of the fuel cell is connected with the low-voltage side of the boosting DC/DC converter, the first power supply module comprises a first inverter and/or the second power supply module comprises a second inverter, the direct-current side of the first inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating-current side of the first inverter is connected with a motor in a hydrogen circulating pump; the direct current side of the second inverter is used for being connected with the high-voltage side of the boosting DC/DC converter, and the alternating current side of the second inverter is connected with a motor in a cooling water pump.
9. The vehicle of claim 8, wherein the first power supply module further comprises a first buck DC/DC converter, the DC side of the first inverter being connected to the low side of the first buck DC/DC converter, the high side of the first buck DC/DC converter being connected to the high side of the boost DC/DC converter; the second power supply module further comprises a second step-down DC/DC converter, the direct current side of the second inverter is connected with the low voltage side of the second step-down DC/DC converter, and the high voltage side of the second step-down DC/DC converter is connected with the high voltage side of the boost DC/DC converter.
10. The vehicle according to claim 9, characterized in that the first step-down DC/DC converter and/or the second step-down DC/DC converter includes a first power conversion unit, an isolation transformer, and a second power conversion unit connected in this order.
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| CN201910092841.2A CN111497686A (en) | 2019-01-30 | 2019-01-30 | Fuel cell power supply system and vehicle using same |
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| CN201910092841.2A CN111497686A (en) | 2019-01-30 | 2019-01-30 | Fuel cell power supply system and vehicle using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112009275A (en) * | 2020-09-01 | 2020-12-01 | 东风汽车集团有限公司 | Integrated fuel cell double-high-voltage power supply and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112009275A (en) * | 2020-09-01 | 2020-12-01 | 东风汽车集团有限公司 | Integrated fuel cell double-high-voltage power supply and power supply system |
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