CN208046459U - A kind of DC-DC converter of fuel cell - Google Patents
A kind of DC-DC converter of fuel cell Download PDFInfo
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- CN208046459U CN208046459U CN201820328440.3U CN201820328440U CN208046459U CN 208046459 U CN208046459 U CN 208046459U CN 201820328440 U CN201820328440 U CN 201820328440U CN 208046459 U CN208046459 U CN 208046459U
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Abstract
The utility model discloses a kind of DC-DC converters of fuel cell, including 4 phase-shifting full-bridge DC-DC circuits, phase-shifting full-bridge DC-DC circuit includes phase-shifting full-bridge DC-DC conversion circuit and LC filter circuits, phase-shifting full-bridge DC-DC conversion circuit includes primary circuit and secondary circuit, primary circuit includes the primary side winding and H inverter bridges of transformer, and H inverter bridges include two bridge arms and resonant inductance；Each bridge arm includes two concatenated switching tubes；After resonant inductance is concatenated with primary side winding, both ends connect the midpoint of two bridge arms respectively, and the output of secondary circuit terminates LC filter circuits, and the output end of LC filter circuits is phase-shifting full-bridge DC-DC circuit output end；The input terminal of 4 phase-shifting full-bridge DC-DC circuits is attempted by the output end of fuel cell, and the output end of 4 phase-shifting full-bridge DC-DC circuits is connected two-by-two and after connecing, then is connect with the input terminal of lithium battery.The utility model crosses the connection in series-parallel that DC-DC is staggeredly isolated in 4 tunnels, can realize that small-volume large-power exports, have a safety feature, output current ripple is smaller.
Description
[technical field]
The utility model is related to DC-DC converter more particularly to a kind of DC-DC converters of fuel cell.
[background technology]
DC-DC converter, the energy conversion that can be used in fuel cell car.Fuel cell in fuel cell car is
Storage fuel and oxidant chemical reaction are converted into electric energy, it is noiseless free of contamination with energy conversion efficiency height
Advantage.Simultaneously as fuel cell increases with output current, the characteristic that output voltage reduces has output characteristics is soft to lack
Point.However, the motor of electric vehicle is a very big dynamic load, so usually fuel cell is needed through a DC-
DC converters connect the energy storage device (being typically high pressure lithium battery) of a high-specific-power and then connect motor load again.Fuel cell
DC-DC converter need to meet high-power, small size, good heat dissipation, high dynamic property.
Currently, in fuel cell car, motor peak power can reach tens kilowatts.Fuel cell energy itself turns
Change efficient, in order to improve the energy conversion efficiency of vehicle, the power of fuel cell DC-DC converter also accordingly reaches tens
Watt.In high power D C-DC converters, in order to realize smaller volume and heat dissipation, it will usually use non-isolated topology.It is existing
High power fuel cell DC-DC converter mostly use non-isolated Boost topology.Using Boost topologys, on control is realized
Simply, it is not equipped with isolating transformer, although volume and weight can be reduced.But non-isolated topology is because former secondary side is same altogether
A loop of power circuit, a series of problems, such as Conduction Interference, security risk can be brought.
[invention content]
The technical problem to be solved by the present invention is to provide it is a kind of have a safety feature, the fuel that output current ripple is smaller
The DC-DC converter of battery.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is a kind of DC-DC changes of fuel cell
Parallel operation, including phase-shifting full-bridge DC-DC circuit that fuel cell, lithium battery and 4 phases mutually stagger, phase-shifting full-bridge DC-DC electricity
Road includes phase-shifting full-bridge DC-DC conversion circuit and LC filter circuits, and phase-shifting full-bridge DC-DC conversion circuit includes primary circuit and pair
Side circuit, primary circuit include the primary side winding and H inverter bridges of transformer, and H inverter bridges include two bridge arms and resonant inductance；Often
A bridge arm includes two concatenated switching tubes；After resonant inductance is concatenated with primary side winding, both ends connect the midpoint of two bridge arms respectively,
The output of secondary circuit terminates LC filter circuits, and the output end of LC filter circuits is phase-shifting full-bridge DC-DC circuit output end；4
The input terminal of phase-shifting full-bridge DC-DC circuit is attempted by the output end of fuel cell, the output end of 4 phase-shifting full-bridge DC-DC circuits
It connects, then is connect with the input terminal of lithium battery two-by-two and after connecing.
The DC-DC converter of above-described fuel cell, secondary circuit include two vice-side windings and two of transformer
The output of a rectification circuit, each vice-side winding terminates corresponding rectification circuit；The output end series connection of two rectified currents is followed by
LC filter circuits.
The DC-DC converter of the fuel cell of the utility model is interlocked by 4 tunnels is isolated the connection in series-parallel of DC-DC, Neng Goushi
Existing small-volume large-power output, has a safety feature, output current ripple is smaller.
[description of the drawings]
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is the circuit block diagram of the DC-DC converter of the utility model embodiment fuel cell.
Fig. 2 is the schematic diagram of the utility model embodiment phase-shifting full-bridge DC-DC circuit.
Fig. 3 is the pwm waveform figure of the utility model embodiment phase-shifting full-bridge DC-DC conversion circuit.
Fig. 4 is the control oscillogram of the 4 advanced arm upper switch pipe of road phase-shifting full-bridge DC-DC circuit of the utility model embodiment.
Fig. 5 is the current waveform figure of the DC-DC converter filter inductance of the utility model embodiment fuel cell.
[specific implementation mode]
The structure and principle of the DC-DC converter of the utility model embodiment fuel cell are as shown in Figures 1 to 5.
In Fig. 1, DCDC1, DCDC2, DCDC3, DCDC4 are that 4 circuits form duplicate phase-shifting full-bridge DC-DC changes
Change circuit.Their input terminal is all attempted by the output end of fuel cell (Fuel Cell).The output of DCDC1 and DCDC2 point
Not after LC filter circuits LC1 and LC2 and it is linked together.Equally, the output of DCDC3 and DCDC4 is passed through LC and is filtered respectively
After circuit LC3 and LC4 and it is linked together.Then again that the parallel connection of the Parallel opertation of DCDC1, DCDC2 and DCDC3, DCDC4 is defeated
Go out to be together in series.The cathode of filter circuit LC1 and LC2 output end connects the anode of filter circuit LC3 and LC4 output end, filtered electrical
The anode of road LC1 and LC2 output end connects the anode of high pressure lithium battery (Li Battery), filter circuit LC3 and LC4 output end
Cathode connects high pressure cathode of lithium battery.For fuel cell DC-DC converter, it is accomplished that boosting inverter.So 4 tunnel phase shifts
Full-bridge DC-DC conversion circuit primary side inputs parallel way, can realize the shunting of primary side very well, reduces primary side switch device and change
The current stress of depressor.Then the in parallel two-by-two of the secondary side output of No. 4 converters is connected, energy will be per DC-DC converter pair all the way
The device voltage stress and current stress on side reduce half.
It is shown in Fig. 2, the physical circuit topology of DCDC1 in embodiment is illustrated, other three tunnels are same.DCDC1 packets
Primary circuit and secondary circuit are included, the primary circuit of DCDC1 includes the primary side winding and full bridge inverter of transformer, and full-bridge is inverse
It includes 4 switching tubes Q1, Q2, Q3, Q4 and resonant inductance Lr to become circuit.Wherein diode D1, D2, D3, D4 is the body of switching tube
Diode, capacitance C1, C2, C3, C4 are the junction capacity of switching tube.The pwm control signal of 4 switching tubes be respectively PWM1A,
PWM1B、PWM1C、PWM1D。
The secondary circuit of DCDC1 includes two vice-side windings and two full bridge rectifiers of transformer, two secondary sides around
The number of turns, line footpath, material, the winding of group are completely the same, two full bridge rectifiers by same model diode D11, D12, D13,
D14 and D15, D16, D17, D18 composition.Two vice-side windings are connected after corresponding full bridge rectifier rectification respectively.The
The cathode of one full bridge rectifier output end connects the anode of the second full bridge rectifier output end.Two windings.Two-way rectification is defeated
Go out the filtered circuit LC1 filtering of the output after series connection.LC1 filter circuits are made of filter inductance Lo1 and filter capacitor Co1.
The secondary side of original of DCDC1 translation circuits interference free performance and the safety of entire circuit are capable of by transformer isolation.
Secondary side is connected after full-bridge rectification pipe respectively using two windings, can effectively reduce the voltage stress of rectifier diode.
It is shown in Fig. 3, illustrate the pwm control signal PWM1A of 4 way switch pipe of DCDC1 phase-shifting full-bridges in embodiment,
PWM1B, PWM1C, PWM1D send out wave mode.The switching signal PWM1B of the switching signal PWM1A and Q3 of wherein Q1 realize band dead zone
Complementary conducting, the switching signal PWM1D of the switching signal PWM1C and Q4 of Q2 realizes the complementary conducting with dead zone.The switch of Q1
There are phase shift duty ratio (phase shifting angle) D between the switching signal PWM1C of signal PWM1A and Q2.
It is shown in Fig. 4, illustrate a left side for 4 road phase-shifted full-bridge converter of DCDC1, DCDC2, DCDC3, DCDC4 in embodiment
The hair wave mode of switching signal PWM1A, PWM2A, PWM3A, PWM4A of upper switch pipe (advanced arm upper tube).Wherein PWM1A with
PWM2A phase by pi/2, PWM3A and PWM4A phase by pi/2, PWM1A and phase by pi/4 PWM3A.It is achieved that 4
The mutual misphase of Lu Fabo modes, secondary side output current ripple also can corresponding misphases.
It is shown in Fig. 5, illustrate the pair of 4 road phase-shifted full-bridge converter of DCDC1, DCDC2, DCDC3, DCDC4 in embodiment
Current waveform ILo1, ILo2, ILo3, ILo4 of the filtered inductance of side circuit and total output current Io waveforms.ILo1 with
ILo2 current ripples phase by pi/2, ILo3 and ILo4 current ripples phase by pi/2, ILo1 and ILo3 current ripples phases
Phase difference of pi/4.It is achieved that the 4 mutual misphases of road DCDC output current ripples.Total output current ripple frequency becomes single channel
Four times, ripple peak-to-peak value becomes a quarter of single channel.
In order to not only meeting the high-power output of high power density, but also it can realize isolation.The utility model provides one kind
The high power fuel cell DC-DC converter of serial parallel structure.The DC-DC converter can not only be realized high-power by smaller size smaller
Output, and realize former secondary side isolation per transformer is passed through all the way, ensure safety, strong antijamming capability.Simultaneously by each
It is interlaced between road, it can realize smaller output current ripple, improve the service life of high pressure lithium battery.
Technical solution adopted by the utility model to solve its technical problems is：Pass through output two using 4 DC-DC circuits
Two then series connection in parallel.In the present invention, DC-DC circuit is using phase-shifting full-bridge topology.4 tunnel DC-DC circuits it is defeated
Enter while and being connected in the output of fuel cell.Output-parallel after the secondary side rectifying and wave-filtering on the first via and the second tunnel, third road
With output-parallel after the secondary side rectifying and wave-filtering on the 4th tunnel.The output on one or two roads and 34 tunnels is connected again, shares output voltage and output
Power.The phase-shifting full-bridge that the transformer primary side of DC-DC circuit is made of 4 way switch pipes.The pwm control signal of switching tube is by controlling
Device output processed.The transformer secondary of DC-DC circuit is that two windings are individually connected by full-bridge rectification, can be mitigated in this way
Rectification tube voltage drop.Each DC-DC circuit topology only needs to provide the general power of a quarter, and secondary side rectifying tube bears four/
One voltage, primary side switch pipe only need the total current by a quarter.It, can be fine by topological mode that is this and going here and there
Realization power contribution, while being also convenient for the type selecting of device and the design of magnetic elements.The primary side switch pipe of 4 road DC-DC
Completely wrong phase may be implemented by controller in control, in Same Efficieney, output voltage and output filter part, realizes output
Current ripples are a quarter of error-free circuitry phase.If realizing identical ripple, the filtering device of completely wrong circuitry phase can be than error-free
Circuitry phase is much smaller.
The connection in series-parallel of DC-DC is isolated in being interlocked by 4 tunnels for the utility model above example, can realize the big work(of small size
Rate exports, and has a safety feature, output current ripple is smaller.
Claims (2)
1. a kind of DC-DC converter of fuel cell, including fuel cell and lithium battery, which is characterized in that including 4 phase phases
The phase-shifting full-bridge DC-DC circuit being mutually staggered, phase-shifting full-bridge DC-DC circuit include phase-shifting full-bridge DC-DC conversion circuit and LC filtering
Circuit, phase-shifting full-bridge DC-DC conversion circuit include primary circuit and secondary circuit, and primary circuit includes the primary side winding of transformer
With H inverter bridges, H inverter bridges include two bridge arms and resonant inductance；Each bridge arm includes two concatenated switching tubes；Resonant inductance
After being concatenated with primary side winding, both ends connect the midpoint of two bridge arms respectively, and the output of secondary circuit terminates LC filter circuits, LC filtering
The output end of circuit is phase-shifting full-bridge DC-DC circuit output end；The input terminal of 4 phase-shifting full-bridge DC-DC circuits is attempted by fuel
The output end of battery, the output end of 4 phase-shifting full-bridge DC-DC circuits are connected two-by-two and after connecing, then are connected with the input terminal of lithium battery
It connects.
2. the DC-DC converter of fuel cell according to claim 1, which is characterized in that secondary circuit includes transformer
Two vice-side windings and two rectification circuits, the output of each vice-side winding terminate corresponding rectification circuit；Two rectified currents
The output end series connection of stream is followed by LC filter circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820328440.3U CN208046459U (en) | 2018-03-09 | 2018-03-09 | A kind of DC-DC converter of fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820328440.3U CN208046459U (en) | 2018-03-09 | 2018-03-09 | A kind of DC-DC converter of fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208046459U true CN208046459U (en) | 2018-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820328440.3U Active CN208046459U (en) | 2018-03-09 | 2018-03-09 | A kind of DC-DC converter of fuel cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713676A (en) * | 2019-01-23 | 2019-05-03 | 深圳市高斯宝电气技术有限公司 | A kind of control method of crisscross parallel Bridgeless power factor circuit correcting circuit |
| WO2020134313A1 (en) * | 2018-12-29 | 2020-07-02 | 中兴通讯股份有限公司 | Full-bridge circuit and full-bridge converter |
-
2018
- 2018-03-09 CN CN201820328440.3U patent/CN208046459U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020134313A1 (en) * | 2018-12-29 | 2020-07-02 | 中兴通讯股份有限公司 | Full-bridge circuit and full-bridge converter |
| CN109713676A (en) * | 2019-01-23 | 2019-05-03 | 深圳市高斯宝电气技术有限公司 | A kind of control method of crisscross parallel Bridgeless power factor circuit correcting circuit |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210918 Address after: 518000 101, block B, building a, Jingfa zhizaoyuan, Xiawei community, Xixiang street, Bao'an District, Shenzhen, Guangdong Province Patentee after: Shenzhen Energy Efficiency Electrical Technology Co.,Ltd. Address before: 518000 south of Baotian 1st Road, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: GOSPOWER DIGITAL TECHNOLOGY (SHENZHEN) Co.,Ltd. |
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| TR01 | Transfer of patent right |