CN110385995A - A kind of control circuit and control method of Hydrogen Fuel-cell Vehicles dcdc converter - Google Patents
A kind of control circuit and control method of Hydrogen Fuel-cell Vehicles dcdc converter Download PDFInfo
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- CN110385995A CN110385995A CN201910695781.3A CN201910695781A CN110385995A CN 110385995 A CN110385995 A CN 110385995A CN 201910695781 A CN201910695781 A CN 201910695781A CN 110385995 A CN110385995 A CN 110385995A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 49
- 239000001257 hydrogen Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000009466 transformation Effects 0.000 claims abstract description 30
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 54
- 238000005457 optimization Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 230000010363 phase shift Effects 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000005755 formation reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 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 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
-
- 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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
-
- 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
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
-
- 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
-
- 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
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
-
- 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
Abstract
A kind of control circuit and control method of Hydrogen Fuel-cell Vehicles dcdc converter, it is in parallel by the power switching modules of multiple three Level Full Bridges LLC topology formations, resonant transformation, transimission power and the power expansion for realizing converter are carried out to the output of hydrogen fuel cell；Multiple voltage changing modules carry out voltage current transformation to the output of each power switching modules in such a way that secondary tandem, primary connect one to one with the output of power switching modules respectively, and automatic current equalizing is realized in each circuit for forming power switching modules and voltage changing module；Rectification processing is carried out to transformed total voltage electric current finally by rectification module, burning voltage is exported and is powered to load.All power switching modules are achieved in using Single Controller synchronously control, reduce control cost；Power switching modules are in parallel, conducive to the power grade of transform expansion device；Using three Level Full Bridge LLC topological circuit of single-stage, converter is made to work in a variety of sofe switch patterns such as frequency reducing, constant frequency copped wave, raising frequency and constant frequency phase shift.
Description
Technical field
The invention belongs to the design of hydrogen fuel cell dcdc converter, application and its control technology field more particularly to one
The control circuit and control method of kind Hydrogen Fuel-cell Vehicles dcdc converter.
Background technique
With the development of modern society, the demand to the energy is increasing, and traditional energy is seriously polluted and non-renewable, because
This new energy will be applied more and more, will also have more new energy and be applied on the vehicles such as automobile.Phase
Than other new energy, hydrogen fuel cell is using hydrogen as fuel, and air carries out chemical reaction converting electrical energy as oxidant, instead
Answer object be water and noise it is small, really realize zero-emission, no pollution to the environment is considered as the optimal energy sources of future automobile.
Currently, there are many new energy bus using hydrogen fuel cell as full vehicle power source or the supplement energy, power grade both at home and abroad
Range is from tens kilowatts to hundred kilowatts, and since hydrogen fuel cell dynamic response is slow, external characteristics is soft, and output voltage range is wider
And it is relatively low, needing not only can be by the energy of fuel cell smoothly by the high-power one-way isolation dcdc converter of a high-gain
It is supplied to load, and fuel battery service life can be extended, supplements the energy additionally as bus, there are fuel cell and lithium batteries simultaneously
The case where power supply, also requires such dcdc converter output voltage adjustable in wide-voltage range, increases converter high-gain and wants
It asks, simultaneously because volume and electrical safety isolation to such dcdc converter also have higher requirements applied to vehicle-mounted.
In the prior art, in order to meet wide input and output voltage range (i.e. high-gain requirement), and expansible power
Grade meets high-power applications, and transfer efficiency with higher and electrical isolation, such dcdc converter is generallyd use such as Fig. 1
Shown in 2 stage converter constitute high frequency DCDC main circuit.Wherein, the B1 of Fig. 1 is that 2 BOOST converters in parallel (can also
To be 1 or N number of parallel connection) the external hydrogen fuel cell output of its input, it exports and connects B2 full-bridge LLC converter, BOOST transformation
Device is responsible in wide input voltage range providing stable input to full-bridge LLC converter B2, and full-bridge LLC converter B2 is responsible for
Output voltage is adjusted, the voltage conversion of electrical isolation is realized, really increases main circuit gain by two stage power transformation, lead to
The switching frequency of raising BOOST and LLC converter is crossed to reduce volume.In addition, such dcdc converter usually passes through shown in Fig. 2
Mode parallel connection carry out power expansion, realize high-power output.
As described above, the prior art is converted using two stage power and passes through the dcdc converter in parallel for realizing high-power output
The shortcomings that main circuit, is:
A) control is at high cost, and each dcdc converter requires independent controller；
B) control difficulty is big, needs to realize the stream of dcdc converter by software algorithm, needs to increase between controller
Communication hardware and algorithm；
C) two stage power converts, and efficiency is multiplied, and is not all soft switch topology, causes overall efficiency relatively low；
D) two-stage circuit, device is more, and volume is bigger than normal；
E) power device of the hydrogen fuel cell of (usually 90~240Vdc) relatively low for output voltage, the main circuit is difficult
With type selecting.
Summary of the invention
In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a kind of Hydrogen Fuel-cell Vehicles dcdc converters
Control circuit and control method, to meet the application requirement of Hydrogen Fuel-cell Vehicles, i.e., converter hydrogen fuel cell it is lower compared with
Wide input voltage range with compared in wide output voltage range and can be realized by power expansion high-power output, primary and secondary electrically every
From and miniaturization requirement.
First aspect present invention provides a kind of control circuit of Hydrogen Fuel-cell Vehicles dcdc converter, connects hydrogen fuel electricity
Pond, the control circuit include:
Multiple inputs power switching modules parallel with one another, the input of multiple power switching modules are fired with the hydrogen
The output connection for expecting battery carries out resonance change for constituting multiple circuits, and to the power supply signal of hydrogen fuel cell output
Change, transimission power and realize converter power expansion；
Multiple voltage changing modules, the secondary tandems of multiple voltage changing modules, it is primary respectively with the power switching modules
Output, which corresponds, to be connected, for carrying out voltage current transformation to the power supply signal respectively for the corresponding circuit,
And multiple circuits is made to realize automatic current equalizing；And
Rectification module, the rectification module are connect with the head and the tail both ends after the secondary tandem of multiple voltage changing modules, are used
Rectification processing is carried out in the summation to the power supply signal after voltage current transformation, and exports optimization signal to carry out to load
Power supply.
Preferably, each power switching modules include:
The first converter unit, the second converter unit and the resonant element sequentially connected；
First converter unit and second converter unit are used to convert the direct current signal in the corresponding circuit
For AC signal；The resonant element is used to carry out resonance processing to the AC signal.
Preferably, first converter unit includes:
First capacitor, the second capacitor, the 5th capacitor, first diode, the second diode, first switch tube, second switch
Pipe, third switching tube and the 4th switching tube；
The output end of the first termination first switch tube of the first capacitor, the second end of the first capacitor, institute
The cathode for stating the first end of the second capacitor, the anode of the first diode and second diode connects altogether, and described second
The input terminal of second termination the 4th switching tube of capacitor, the output end of the 4th switching tube, the third switching tube
The first end of input terminal, the anode of second diode and the 5th capacitor connects altogether, the output of the third switching tube
Terminate the input terminal of the second switch, the input terminal, described of the output end of the second switch, the first switch tube
The second end of the cathode of first diode and the 5th capacitor connects altogether.
Preferably, second converter unit includes:
Third capacitor, the 4th capacitor, the 6th capacitor, third diode, the 4th diode, the 5th switching tube, the 6th switch
Pipe, the 7th switching tube and the 8th switching tube；
The output end of first termination the 5th switching tube of the third capacitor, the second end of the third capacitor, institute
The cathode for stating the first end of the 4th capacitor, the anode of the third diode and the 4th diode connects altogether, and the described 4th
The input terminal of second termination the 8th switching tube of capacitor, the output end of the 8th switching tube, the 7th switching tube
The first end of input terminal, the anode of the 4th diode and the 6th capacitor connects altogether, the output of the 7th switching tube
Terminate the input terminal of the 6th switching tube, the input terminal, described of the output end of the 6th switching tube, the 5th switching tube
The second end of the cathode of third diode and the 6th capacitor connects altogether.
Preferably, the resonant element includes:
Resonant capacitance and resonant inductance；
First termination first converter unit of the resonant capacitance, the first termination described second of the resonant inductance
Converter unit, the second end of the resonant capacitance voltage changing module corresponding with the second termination of the resonant inductance.
Preferably, each voltage changing module includes a transformer,
The input terminal of multiple transformers is connected with the output end of multiple power switching modules one-to-one correspondence respectively
It connects, the output end of multiple transformers is sequentially connected in series.
Preferably, the rectification module includes rectifier bridge.
Second aspect of the present invention provides a kind of control method of Hydrogen Fuel-cell Vehicles dcdc converter, the control method
Include:
Multiple circuits are set, and resonant transformation, transimission power and realization are carried out to the power supply signal of hydrogen fuel cell output
The power expansion of converter；
Voltage current transformation is carried out to the power supply signal respectively for the corresponding circuit, and makes multiple circuits
Realize automatic current equalizing；
Rectification processing is carried out to the summation of the power supply signal after voltage current transformation, and exports optimization signal to negative
Load is powered.
The control circuit and control method of a kind of Hydrogen Fuel-cell Vehicles dcdc converter provided by the invention, the control circuit
Including rectification module, multiple power switching modules and multiple voltage changing modules, pass through multiple three Level Full Bridges LLC topology formations
Power switching modules are in parallel, carry out resonant transformation, transimission power to the output of hydrogen fuel cell and realize that the power of converter expands
Exhibition；And by multiple voltage changing modules with secondary tandem, the primary side to connect one to one respectively with power switching modules output
Formula carries out voltage current transformation to the output of each power switching modules, and it is each to form power switching modules with voltage changing module
Realize automatic current equalizing in a circuit；Rectification processing is carried out to transformed total voltage electric current finally by rectification module, output is stablized
Voltage is powered to load.The control circuit can make all power switching modules using Single Controller synchronously control, reduce
Control cost；Power switching modules are in parallel, are conducive to transform expansion device power grade, each power switching modules of extension can be real
Existing automatic current equalizing, the complexity for reducing control algolithm improve whole aircraft reliability；Using three Level Full Bridge LLC topological circuit of single-stage,
So that converter is worked in a variety of sofe switch patterns such as frequency reducing, constant frequency copped wave, raising frequency and constant frequency phase shift, improves transducer effciency and benefit
In power device type selecting, device cost is reduced.
Detailed description of the invention
Fig. 1 is the exemplary circuit figure for the dcdc converter main circuit that the prior art is related to.
Fig. 2 is the dcdc converter main circuit parallel connection schematic diagram that the prior art is related to.
Fig. 3 is a kind of module knot of the control circuit for Hydrogen Fuel-cell Vehicles dcdc converter that first aspect present invention provides
Structure schematic diagram.
Fig. 4 is a kind of example electricity of the control circuit for Hydrogen Fuel-cell Vehicles dcdc converter that first aspect present invention provides
Lu Tu.
Fig. 5 is that power is opened in a kind of control circuit for Hydrogen Fuel-cell Vehicles dcdc converter that first aspect present invention provides
Close the exemplary circuit figure of module.
Fig. 6 is a kind of control circuit specific implementation for Hydrogen Fuel-cell Vehicles dcdc converter that first aspect present invention provides
The power expansion schematic diagram of example.
The step of Fig. 7 is a kind of control method for Hydrogen Fuel-cell Vehicles dcdc converter that second aspect of the present invention provides stream
Journey schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The control circuit and control method of a kind of above-mentioned Hydrogen Fuel-cell Vehicles dcdc converter, which includes whole
Flow module, multiple power switching modules and multiple voltage changing modules are opened by the power of multiple three Level Full Bridges LLC topology formations
Wired in parallel is closed, resonant transformation, transimission power and the power expansion for realizing converter are carried out to the output of hydrogen fuel cell；And
Multiple voltage changing modules by secondary tandem, it is primary connect one to one respectively with power switching modules output in a manner of to each
The output of power switching modules carries out voltage current transformation, and each circuit for forming power switching modules and voltage changing module is real
Existing automatic current equalizing；Rectification processing is carried out to transformed total voltage electric current finally by rectification module, exports burning voltage to negative
Load is powered.The control circuit can make all power switching modules using Single Controller synchronously control, reduce control cost；
Power switching modules are in parallel, are conducive to transform expansion device power grade, and each power switching modules of extension can be achieved automatic equal
Stream, the complexity for reducing control algolithm improve whole aircraft reliability；Using three Level Full Bridge LLC topological circuit of single-stage, make converter
A variety of sofe switch patterns such as frequency reducing, constant frequency copped wave, raising frequency and constant frequency phase shift are worked in, transducer effciency is improved and are conducive to power device
Part type selecting reduces device cost.
Fig. 3 shows a kind of mould of the control circuit of Hydrogen Fuel-cell Vehicles dcdc converter of first aspect present invention offer
Block structure, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
A kind of control circuit of above-mentioned Hydrogen Fuel-cell Vehicles dcdc converter, connects hydrogen fuel cell, which includes:
Multiple inputs power switching modules 101 parallel with one another, the input of multiple power switching modules 101 is and hydrogen fuel
The output of battery connects, and carries out resonant transformation, transmission for constituting multiple circuits, and to the power supply signal of hydrogen fuel cell output
Power and the power expansion for realizing converter；Wherein, the mutual containing in multiple circuits, and for make control circuit be in frequency reducing,
Any one in the mode of constant frequency copped wave, raising frequency and constant frequency phase shift；
Multiple voltage changing modules 102, the secondary tandems of multiple voltage changing modules 102, it is primary respectively with power switching modules 101
Output, which corresponds, to be connected, and for carrying out voltage current transformation to power supply signal respectively for corresponding circuit, and is made multiple
Realize automatic current equalizing in circuit；And
Rectification module 103, the output end corresponding with multiple voltage changing modules 102 of rectification module 103 connected after head and the tail
Both ends connection, carries out rectification processing for the summation to the power supply signal after voltage current transformation, and exports optimization signal with right
Load is powered.
As an embodiment of the present invention, above-mentioned control circuit passes through multiple power switching modules 101 parallel with one another, multiple
Voltage changing module 102 and rectification module 103 constitute three Level Full Bridge LLC converters of multiple equal-wattage grade parallel connections.
Also, three Level Full Bridge LLC converters can be enabled by the switching sequence of the multiple power switching modules 101 of synchronously control
Main circuit works in the operating modes such as constant frequency phase shift after frequency reducing, the constant frequency copped wave nearby of LLC resonance frequency, raising frequency and raising frequency, is used for
The gain of dcdc converter main circuit is improved, it is enabled to meet the high-power output operating condition of wide input and output voltage range；Utilize transformation
The characteristics of input of module is in parallel, output is connected realizes the automatic current equalizing of each power switching modules 101 and voltage changing module 102；
Pass through the quantity of extended power switch module 101 and adjusts the capacity of power device in rectification module 103 to realize power expansion
Realize high-power output.Due to the multiple power switching modules 101 of the main circuit synchronously control, can use lower-cost
Single Controller, and under level-one power switch condition, it can be realized within the scope of full input and output voltage range and full load
Sofe Switch improves overall efficiency.
Fig. 4 shows a kind of showing for the control circuit of Hydrogen Fuel-cell Vehicles dcdc converter of first aspect present invention offer
Example circuit, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
As an embodiment of the present invention, above-mentioned each voltage changing module 102 includes a transformer,
The input terminal of multiple transformers is connected with the output end of multiple power switching modules 101 one-to-one correspondence respectively, more
The output end of a transformer is sequentially connected in series.
Specifically, since multiple power switching modules 101 are connected with parallel way, then the primary line of multiple transformers
Circle also connects for parallel way, and the secondary coil of multiple transformers is series system connection.
As an embodiment of the present invention, above-mentioned rectification module 103 includes rectifier bridge, and Fig. 4 uses diode D11, diode
The rectifier bridge that D12, diode D13 and diode D14 are constituted is realized.
Fig. 5 shows function in a kind of control circuit of Hydrogen Fuel-cell Vehicles dcdc converter of first aspect present invention offer
The exemplary circuit of rate switch module, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
As an embodiment of the present invention, above-mentioned each power switching modules 101 include:
The first converter unit 1011, the second converter unit 1012 and the resonant element 1013 sequentially connected；
First converter unit 1011 and the second converter unit 1012 are used for direct current signal (the power supply letter in corresponding circuit
Number) be converted to AC signal；Resonant element 1013 is used to carry out resonance processing to above-mentioned AC signal.
As an embodiment of the present invention, above-mentioned first converter unit 1011 includes first capacitor C1, the second capacitor C2, the 5th
Capacitor C5, first diode D1, the second diode D2, first switch tube Q1, second switch Q2, third switching tube Q3 and
Four switching tube Q4.
The output end of the first termination first switch tube Q1 of first capacitor C1, the second end of first capacitor C1, the second capacitor
The cathode of the first end of C2, the anode of first diode D1 and the second diode D2 connects altogether, the second termination of the second capacitor C2
The input terminal of 4th switching tube Q4, the output end of the 4th switching tube Q4, the input terminal of third switching tube Q3, the second diode D2
The first end of anode and the 5th capacitor C5 connect altogether, the input terminal of the output termination second switch Q2 of third switching tube Q3, the
The output end of two switching tube Q2, the input terminal of first switch tube Q1, the cathode of first diode D1 and the 5th capacitor C5
Two ends connect altogether.
Specifically, first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th switching tube Q4 can be used
Field-effect tube or triode are realized.
As an embodiment of the present invention, above-mentioned second converter unit 1012 includes third capacitor C3, the 4th capacitor C4, the 6th
Capacitor C6, third diode D3, the 4th diode D4, the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7 and
Eight switching tube Q8.
The output end of the first the 5th switching tube Q5 of termination of third capacitor C3, the second end of third capacitor C3, the 4th capacitor
First end, the anode of third diode D3 and the cathode of the 4th diode D4 of C4 connects altogether, the second termination of the 4th capacitor C4
The input terminal of 8th switching tube Q8, the output end of the 8th switching tube Q8, the input terminal of the 7th switching tube Q7, the 4th diode D4
The first end of anode and the 6th capacitor C6 connect altogether, the input terminal of the 6th switching tube Q6 of output termination of the 7th switching tube Q7, the
The output end of six switching tube Q6, the input terminal of the 5th switching tube Q5, the cathode of third diode D3 and the 6th capacitor C6
Two ends connect altogether.
Specifically, the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7 and the 8th switching tube Q8 can be used
Field-effect tube or triode are realized.
As an embodiment of the present invention, above-mentioned resonant element 1013 includes resonant capacitance Cr and resonant inductance Lr.
First the first converter unit 1011 of termination of resonant capacitance Cr, first the second converter unit of termination of resonant inductance Lr
The second end of 1012, resonant capacitance Cr voltage changing module 102 corresponding with the second termination of resonant inductance Lr.
The control circuit that Fig. 6 shows a kind of Hydrogen Fuel-cell Vehicles dcdc converter of first aspect present invention offer is specific
The power expansion schematic diagram of embodiment, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
It is a specific embodiment of the invention below, is passed through using one by 4 7.5KW switching power devices A1~A4
4 7.5KW transformer TR1~Tr4 primary parallels, the tri- main electricity of Level Full Bridge LLC dcdc converter of 30KW that secondary tandem is realized
Road embodiment describes in detail specific implementation and realization process of the invention, but the present invention is not limited only to 4 power
Three Level Full Bridge LLC dcdc converter main circuits of switch block parallel connection, can be the number of (PCC) power An and transformer Trn
The power grade of the dcdc converter main circuit of amount >=2, switching power devices An and transformer Trn are also not limited to 7.5kW, can
To be any power grade.
As shown in fig. 6, the present embodiment by the identical 7.5kW switching power devices A1~A4 of 4 internal structures, 4 it is identical
7.5kW high frequency transformer Tr1~Tr4 and high-frequency rectification circuit A5 connect and compose every 7.5KW by Fig. 6 all can automatic current equalizing
Tri- Level Full Bridge LLC inverter main circuit of 30kW.Wherein, the internal circuit of switching power devices A1~A4 and Fig. 5 describe one
It causes, the pin CN1 and CN2 of A1~A4 is in parallel as total input, external fuel cell output respectively；The pin CN3 of A1~A4 with
CN4 is connect with the primary pins 1 of high frequency transformer Tr1~Tr4 with 2 respectively, and the primary pins 3 and 4 of Tr1~Tr4 such as Fig. 6 institute
Show, the primary parallel secondary tandem of transformer is realized in series connection one by one in such a way that non-same polarity connects Same Name of Ends, to realize 4
The automatic current equalizing of 7.5kW switching power devices and 4 7.5kW transformers；Transformer output pin after series connection becomes the 3 of Tr1
4 pins of pin and Tr4 are respectively connected to X1 and the X2 pin of A5, and the direct current output after realizing high-frequency rectification is supplied on vehicle
DC load.
The working principle of the control circuit is by all switching device Q1~Q8 (Fig. 5 in A1~A4 in synchronously control Fig. 6
Mark) timing, the main circuit can be enabled to work in the multiple-working modes such as frequency reducing, constant frequency copped wave, raising frequency and constant frequency phase shift, these
Mode can significantly improve the gain of main circuit, and these operating modes can all enable main circuit realize that Sofe Switch improves conversion effect
Rate enables main circuit switching power devices A1~A4 by the primary parallel secondary tandem mode of transformer Tr1~Tr4 and connects therewith
Transformer Tr1~the Tr4 connect realizes automatic current equalizing.
Above-mentioned is that it is operable with frequency reducing, constant frequency copped wave, raising frequency and constant frequency phase shift using three Level Full Bridge LLC converters
The characteristics of the characteristics of etc. a variety of sofe switch patterns is in parallel with primary, secondary tandem automatic current equalizing be combined into one it is expansible
Power grade realize high-power output can automatic current equalizing high-gain soft switch high-frequency dcdc converter main circuit.
Fig. 7 shows a kind of step of the control method of Hydrogen Fuel-cell Vehicles dcdc converter of second aspect of the present invention offer
Rapid process, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
The present invention also provides a kind of control methods of Hydrogen Fuel-cell Vehicles dcdc converter, comprising the following steps:
S101., multiple circuits are set, and to the power supply signal of hydrogen fuel cell output carry out resonant transformation, transimission power and
Realize the power expansion of converter；
S102. voltage current transformation is carried out to power supply signal respectively for corresponding circuit, and realizes multiple circuits certainly
It is dynamic to flow；
S103. rectification processing is carried out to the summation of the power supply signal after voltage current transformation, and exports optimization signal with right
Load is powered.
Wherein, in step s101, the mutual containing in multiple circuits, and for making dcdc converter main circuit be in drop
Frequently, any one in the mode of constant frequency copped wave, raising frequency and constant frequency phase shift.
To sum up, the control circuit and controlling party of a kind of Hydrogen Fuel-cell Vehicles dcdc converter provided in an embodiment of the present invention
Method, the control circuit include rectification module, multiple power switching modules and multiple voltage changing modules, pass through multiple three Level Full Bridges
The power switching modules of LLC topology formation are in parallel, carry out resonant transformation, transimission power and realize to become to the output of hydrogen fuel cell
The power expansion of parallel operation；And it is exported one by one with power switching modules respectively by multiple voltage changing modules with secondary tandem, primary
The mode being correspondingly connected with carries out voltage current transformation to the output of each power switching modules, and makes power switching modules and transformation
Realize automatic current equalizing in each circuit of module composition；Transformed total voltage electric current is carried out at rectification finally by rectification module
Reason, exports burning voltage and is powered to load.The control circuit can make all power switching modules same using Single Controller
Step control reduces control cost；Power switching modules are in parallel, are conducive to transform expansion device power grade, and each power of extension is opened
Closing module can be achieved automatic current equalizing, and the complexity for reducing control algolithm improves whole aircraft reliability；Using three Level Full Bridge of single-stage
LLC topological circuit makes converter work in a variety of sofe switch patterns such as frequency reducing, constant frequency copped wave, raising frequency and constant frequency phase shift, improves and becomes
Parallel operation efficiency and be conducive to power device type selecting, reduce device cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of control circuit of Hydrogen Fuel-cell Vehicles dcdc converter, connects hydrogen fuel cell, which is characterized in that the control electricity
Road includes:
Multiple inputs power switching modules parallel with one another, the input of multiple power switching modules are electric with the hydrogen fuel
The output in pond connects, and for constituting multiple circuits, and carries out resonant transformation to the power supply signal of hydrogen fuel cell output, passes
Defeated power and the power expansion for realizing converter；
Multiple voltage changing modules, the secondary tandem of multiple voltage changing modules, the primary output with the power switching modules respectively
One-to-one correspondence is connected, and for carrying out voltage current transformation to the power supply signal respectively for the corresponding circuit, and makes
Realize automatic current equalizing in multiple circuits；And
Rectification module, the rectification module are connect with the head and the tail both ends after the secondary tandem of multiple voltage changing modules, for pair
The summation of the power supply signal after voltage current transformation carries out rectification processing, and exports optimization signal to supply load
Electricity.
2. control circuit as described in claim 1, which is characterized in that each power switching modules include:
The first converter unit, the second converter unit and the resonant element sequentially connected；
First converter unit and second converter unit are used to the direct current signal in the corresponding circuit being converted to friendship
Flow signal；The resonant element is used to carry out resonance processing to the AC signal.
3. control circuit as claimed in claim 2, which is characterized in that first converter unit includes:
First capacitor, the second capacitor, the 5th capacitor, first diode, the second diode, first switch tube, second switch,
Three switching tubes and the 4th switching tube；
The output end of the first termination first switch tube of the first capacitor, the second end of the first capacitor, described the
The cathode of the first end of two capacitors, the anode of the first diode and second diode connects altogether, second capacitor
The second termination the 4th switching tube input terminal, the input of the output end, the third switching tube of the 4th switching tube
The first end at end, the anode of second diode and the 5th capacitor connects altogether, the output termination of the third switching tube
The input terminal of the second switch, the output end of the second switch, the input terminal of the first switch tube, described first
The second end of the cathode of diode and the 5th capacitor connects altogether.
4. control circuit as claimed in claim 3, which is characterized in that second converter unit includes:
Third capacitor, the 4th capacitor, the 6th capacitor, third diode, the 4th diode, the 5th switching tube, the 6th switching tube,
Seven switching tubes and the 8th switching tube；
The output end of first termination the 5th switching tube of the third capacitor, the second end of the third capacitor, described the
The cathode of the first end of four capacitors, the anode of the third diode and the 4th diode connects altogether, the 4th capacitor
The second termination the 8th switching tube input terminal, the input of the output end, the 7th switching tube of the 8th switching tube
The first end at end, the anode of the 4th diode and the 6th capacitor connects altogether, the output termination of the 7th switching tube
The input terminal of 6th switching tube, output end, the input terminal of the 5th switching tube, the third of the 6th switching tube
The second end of the cathode of diode and the 6th capacitor connects altogether.
5. control circuit as claimed in claim 4, which is characterized in that the resonant element includes:
Resonant capacitance and resonant inductance；
First termination first converter unit of the resonant capacitance, second transformation of the first termination of the resonant inductance
Unit, the second end of the resonant capacitance voltage changing module corresponding with the second termination of the resonant inductance.
6. control circuit as described in claim 1, which is characterized in that each voltage changing module includes a transformer,
The input terminal of multiple transformers is connected with the output end of multiple power switching modules one-to-one correspondence respectively, more
The output end of a transformer is sequentially connected in series.
7. control circuit as described in claim 1, which is characterized in that the rectification module includes rectifier bridge.
8. a kind of control method of Hydrogen Fuel-cell Vehicles dcdc converter, which is characterized in that the control method includes:
Multiple circuits are set, and the power supply signal of hydrogen fuel cell output is carried out resonant transformation, transimission power and realized to convert
The power expansion of device；
Voltage current transformation is carried out to the power supply signal respectively for the corresponding circuit, and realizes multiple circuits
Automatic current equalizing；
Rectification processing is carried out to the summation of the power supply signal after voltage current transformation, and export optimization signal with to load into
Row power supply.
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