CN203151375U - Unidirectional boost-buck large power DC/DC converter and hybrid power vehicle - Google Patents
Unidirectional boost-buck large power DC/DC converter and hybrid power vehicle Download PDFInfo
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- CN203151375U CN203151375U CN 201320046606 CN201320046606U CN203151375U CN 203151375 U CN203151375 U CN 203151375U CN 201320046606 CN201320046606 CN 201320046606 CN 201320046606 U CN201320046606 U CN 201320046606U CN 203151375 U CN203151375 U CN 203151375U
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Abstract
An unidirectional boost-buck large power DC/DC converter comprises two sets of double-bridge arms formed by 8 power switch tubes, a switch tube controller, a reactor, a discharge capacitor, a voltage sensor and a current sensor; the two sets of double-bridge arms are connected in parallel on positive and negative terminals of a fuel cell and a power storage battery; the reactor carries out cross connection for the bridge arms of the two sets of double-bridge arms; the discharge capacitor is respectively arranged on the positive and negative terminals of the fuel cell and the power storage battery; the voltage sensor is connected on the positive and negative terminals of the fuel cell and the power storage battery; the current sensor is connected with the reactor; and the voltage sensor and the current sensor are both connected with the switch tube controller. A software programming method is employed to realize a function that the switch tube emits two paths of fixed frequency pulse signals with phase difference of 180 degrees, thereby realizing phase shift control function of two sets re-parallel bridge arms, and further realizing functions of boosting or bucking fuel cell voltage and outputting energy to the power storage battery. The utility model also provides hybrid power vehicle.
Description
Technical field
The utility model relates to the unsteady flow product, is specifically related to a kind of unidirectional buck-boost type high power D C/DC converter and hybrid vehicle, mainly solves the application matching problem of fuel cell on hybrid vehicle.
Background technology
Because fuel cell has following characteristic: output characteristic is softer, and output voltage reduces along with the increase of output current, and when load was big, output voltage descended steeper.The output-power fluctuation of fuel cell is bigger in the practical application, and for example the acceleration of automobile, deceleration and braking etc. all can cause the output pulsation of fuel cell.Then voltage is on the low side or higher if directly give power accumulator, electric machine controller for the output voltage of fuel cell on the other hand, and be difficult to coupling with the characteristic of fuel cell, therefore, between fuel cell and power accumulator, electric machine controller, add the DC/DC converter realize boosting (step-down) mate with its characteristic.In the existing fuel-cell car dynamical system, because fuel cell does not have electric energy feedback absorption, two-way DC/DC converter can not satisfy application requirements.All adopt unidirectional booster type or unidirectional voltage-dropping type DC/DC non-isolation type converter, these 2 kinds of DC/DC converters all adopt IGBT as power switch pipe, and inductance is as energy-storage travelling wave tube.
In the existing DC/DC inverter main circuit scheme 2 power switch pipes are only arranged, formed single brachium pontis, one end of inductance is connected in the intermediate point of single brachium pontis, form BOOST circuit or BUCK circuit topological structure, by conducting or the shutoff of controlling two power switch pipes, can only realize unidirectional boosting or the function of unidirectional step-down, do not satisfy the fuel cell output voltage fuel cell output voltage requirement higher than power accumulator voltage when low and motor power output is less than normal than power accumulator voltage when bigger than normal of motor power output, and require the operating mode demand that fuel cell under above two kinds of operating modes all must power output, give fuel cell power system.
Therefore be necessary prior art is improved.
The utility model content
Exist at existing DC/DC converter and can only realize unidirectional boosting or the function of unidirectional step-down, and do not satisfy the problem of motor power output fuel cell output voltage requirement that fuel cell output voltage is higher than power accumulator voltage when low and motor power output is less than normal than power accumulator voltage when bigger than normal, the utility model provides a kind of unidirectional lifting type high power D C/DC converter, satisfy the full operating mode application requirements of fuel cell on hybrid vehicle, a kind of hybrid vehicle of using this converter also is provided simultaneously.
The utility model for the technical scheme that the technical solution problem adopts is: a kind of unidirectional lifting type high power D C/DC converter, comprise two groups of doube bridge arms being constituted by 8 power switch pipes, 8 switch controlled devices, 2 reactors, 2 discharge capacities and 2 voltage sensors and 2 current sensors, described two groups of doube bridge arms are connected in the positive and negative two ends of fuel cell and power accumulator in parallel, and described each switch controlled device connects each power switch pipe; 2 reactors carry out interconnection with the brachium pontis of two groups of doube bridge arms, and namely reactor connects a single armed in one group of doube bridge arm and a single brachium pontis in another group doube bridge arm; Described 2 discharge capacities are installed in the positive and negative two ends of fuel cell and power accumulator respectively; Described 2 voltage sensors are connected to the positive and negative two ends of described fuel cell and power accumulator, and described 2 current sensors connect described 2 reactors respectively, and described 2 voltage sensors all are connected described switch controlled device with 2 current sensors.
Further, described power switch pipe is little current power switching tube.
Further, described switch controlled device also connects the entire car controller of hybrid vehicle.
A kind of hybrid vehicle is provided with above-mentioned DC/DC controller between the fuel cell of this hybrid vehicle and power accumulator.
Operation principle of the present utility model is: voltage sensor and current sensor are gathered voltage, current signal is sent into the switch controlled device, the switch controlled device is controlled the action of power switch pipe according to whole vehicle control signal and voltage, current signal, what make two groups of doube bridge arms decides 180 ° of frequency pwm pulse signal phase phasic differences, thereby realize the phase shifting control function of two groups of doube bridge arms, make fuel cell to the unidirectional output of power accumulator, thereby solve the problem that exists in the background technology.
The beneficial effects of the utility model are:
(1) the utility model has improved output frequency owing to adopt phase shifting control, has reduced output current ripple.
(2) the utility model has reduced the inductor design manufacture difficulty owing to adopt multiple parallel circuits.
(3) the utility model has alleviated weight owing to adopt little current class power switch pipe to form high-power output, has reduced cost.
(4) the utility model can satisfy the full operating mode application requirements of fuel cell on hybrid power car owing to have unidirectional buck function.
Description of drawings
Fig. 1 is the circuit structure topological diagram of DC/DC converter described in the utility model;
Among the figure, SV1-SV2 is voltage sensor, and SI1-SI2 is current sensor, and Q1-Q8 is power switch pipe, and L1-L2 is reactor, and FU1 is fast acting fuse, and CON is the switch controlled device, A-fuel cell, B-power accumulator.
Embodiment
Further set forth the utility model below in conjunction with the drawings and specific embodiments.
A kind of unidirectional lifting type high power D C/DC converter, as shown in Figure 1, comprise two groups of doube bridge arms that constituted by 8 power switch pipe Q1-Q8, switch controlled device CON, reactor L1-L2, discharge capacity C1-C2 and voltage sensor SV1-SV2 and current sensor SI1-SI2, wherein by Q1, single brachium pontis that Q2 constitutes and by Q5, single brachium pontis that Q6 constitutes is combined into one group of doube bridge arm, by Q3, single brachium pontis that Q4 constitutes and by Q7, single brachium pontis that Q8 constitutes is formed one group of doube bridge arm, described two groups of doube bridge arms are connected in the positive and negative two ends of fuel cell A and power accumulator B in parallel, and described switch controlled device CON connects each power switch pipe; Reactor L1, L2 carry out interconnection with single brachium pontis of two groups of doube bridge arms, and namely reactor L1 connects the single brachium pontis that is made of Q1, Q2 and the single brachium pontis that is made of Q3, Q4, and L2 is used for connecting the single brachium pontis that is made of Q5, Q6 and the single brachium pontis that is made of Q7, Q8; Described discharge capacity C1 is installed in the positive and negative two ends of fuel cell A, and described discharge capacity C2 is installed in the positive and negative two ends of power accumulator B; Described voltage sensor SV1 is connected in the positive and negative two ends of described fuel cell A, described voltage sensor SV2 is connected the positive and negative two ends of power accumulator B, described current sensor SI1 connects described reactor L1, described current sensor SI2 connects described reactor L2, and described voltage sensor SV1-SV2 all is connected described switch controlled device with current sensor SI1-SI2.
As the novel further execution mode of this use, described power switch pipe Q1-Q8 is little current power switching tube.
As the novel further execution mode of this use, described switch controlled device CON also connects the entire car controller that links hybrid vehicle.
Operation principle of the present utility model is: switch controlled device CON receives whole vehicle control signal, and collection voltage sensor SV1, SV2, current sensor SI1, the SI2 signal, described whole vehicle control signal priority is higher than described voltage, current signal, whole vehicle control signal shows when fuel cell can be exported, described controller just receives the signal of described transducer, by comparing sensor signal, control each power switch pipe turn-on and turn-off, realize fuel cell A voltage raise or reduce and to the function of power accumulator B output energy, concrete control strategy is as follows:
When fuel cell A terminal voltage is lower than power accumulator B voltage, at this moment, SV1 signal value＜SV2 signal value, according to whole vehicle control signal and detected SV1, SV2 signal, switch controlled device CON sends pwm pulse signal control Q4, the Q8 break-make of deciding frequency, lag behind 180 ° of the pwm pulse signals of control Q4 of the pwm pulse signal of wherein controlling Q8, switch controlled device CON sends high level signal control Q1, Q5 conducting all the time simultaneously, and switch controlled device CON sends low level signal control Q2, Q3, Q6, Q7 turn-off all the time; During the Q4 conducting, fuel cell A energy flow through Q1, L1, Q4 are stored on the L1; When Q4 turn-offed, the energy that is stored on the L1 was exported to C2 through Q3.In like manner, during the Q8 conducting, fuel cell A energy flow through Q5, L2, Q8 are stored on the L2; When Q8 turn-offed, the energy that is stored on the L2 was exported to C2 through Q6; Thereby to power accumulator B output energy, realization fuel cell A end is held the conveying capacity function of boosting to power accumulator B after the C2 filtering.
When fuel cell A terminal voltage is higher than power accumulator B voltage, at this moment, the SV1 signal value〉the SV2 signal value, according to whole vehicle control signal and detected SV1, SV2 signal, switch controlled device CON sends pwm pulse signal control Q1, the Q5 break-make of deciding frequency, lag behind 180 ° of the pwm pulse signals of control Q1 of the pwm pulse signal of wherein controlling Q5, switch controlled device CON sends high level signal control Q3, Q7 conducting all the time simultaneously, and switch controlled device CON sends low level signal control Q2, Q4, Q6, Q8 turn-off all the time; During the Q1 conducting, flow through C1, Q1, L1, Q3 of fuel cell A energy exports to C2; When Q4 turn-offed, the energy that is stored on the L1 continued to export to C2 through Q3.In like manner, during the Q5 conducting, flow through C1, Q5, L2, Q7 of fuel cell A energy exports to C2; When Q5 turn-offed, the energy that is stored on the L2 continued to export to C2 through Q7; Thereby, to power accumulator B output energy, realize that fuel cell A end is to power accumulator B end step-down conveying capacity function after the C2 filtering.
Realize that by software program method switch controlled device CON sends two-way frequency pwm pulse signal function surely, and two-way 180 ° of pwm pulse signal phase phasic differences frequently surely, thereby realize the phase shifting control functions of two groups heavy brachium pontis in parallel, and then realize fuel cell A voltage raise or reduce and to the function of power accumulator B output energy.
Described switch controlled device CON is integrated with dsp chip, or other programmable chips, and has the veneer of analog signal processing circuit.
A kind of hybrid vehicle is provided with above-mentioned DC/DC controller between the fuel cell of this hybrid vehicle and power accumulator.
Should note; above-mentioned execution mode only is preferred implementation of the present utility model; those of ordinary skills do not break away from do under the enlightenment of the utility model essence and technology do not have novelty and creationary distortion and a retouching; all should be considered as within protection range of the present utility model, protection range of the present utility model is specifically decided on its claims.
Claims (4)
1. unidirectional lifting type high power D C/DC converter, comprise two groups of doube bridge arms being constituted by 8 power switch pipes, 8 switch controlled devices, 2 reactors, 2 discharge capacities and 2 voltage sensors and 2 current sensors, described two groups of doube bridge arms are connected in the positive and negative two ends of fuel cell and power accumulator in parallel, and described each switch controlled device connects each power switch pipe; 2 reactors carry out interconnection with the brachium pontis of two groups of doube bridge arms, and namely reactor connects a single armed in one group of doube bridge arm and a single brachium pontis in another group doube bridge arm; Described 2 discharge capacities are installed in the positive and negative two ends of fuel cell and power accumulator respectively; Described 2 voltage sensors are connected to the positive and negative two ends of described fuel cell and power accumulator, and described 2 current sensors connect described 2 reactors respectively, and described 2 voltage sensors all are connected described switch controlled device with 2 current sensors.
2. according to the described a kind of unidirectional lifting type high power D C/DC converter of claim 1, it is characterized in that described power switch pipe is little current power switching tube.
3. according to the described a kind of unidirectional lifting type high power D C/DC converter of claim 1, it is characterized in that described switch controlled device also connects the entire car controller of hybrid vehicle.
4. a hybrid vehicle is characterized in that, is provided with between the fuel cell of this hybrid vehicle and power accumulator as unidirectional lifting type high power D C/DC controller as described in any one of the claim 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320046606 CN203151375U (en) | 2013-01-29 | 2013-01-29 | Unidirectional boost-buck large power DC/DC converter and hybrid power vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320046606 CN203151375U (en) | 2013-01-29 | 2013-01-29 | Unidirectional boost-buck large power DC/DC converter and hybrid power vehicle |
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| CN203151375U true CN203151375U (en) | 2013-08-21 |
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| CN 201320046606 Expired - Lifetime CN203151375U (en) | 2013-01-29 | 2013-01-29 | Unidirectional boost-buck large power DC/DC converter and hybrid power vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107107843A (en) * | 2015-01-09 | 2017-08-29 | 株式会社自动网络技术研究所 | Automobile electrical source feedway and power pack |
| CN109861341A (en) * | 2019-03-20 | 2019-06-07 | 卢丽芬 | A kind of hybrid power system |
-
2013
- 2013-01-29 CN CN 201320046606 patent/CN203151375U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107107843A (en) * | 2015-01-09 | 2017-08-29 | 株式会社自动网络技术研究所 | Automobile electrical source feedway and power pack |
| CN107107843B (en) * | 2015-01-09 | 2019-03-29 | 株式会社自动网络技术研究所 | Automobile power supplier and power pack |
| CN109861341A (en) * | 2019-03-20 | 2019-06-07 | 卢丽芬 | A kind of hybrid power system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 412007 Liyu Industrial Park, Tianyuan District, Zhuzhou City, Hunan Province Patentee after: Zhongche Times Electric Vehicle Co.,Ltd. Address before: 412007 Liyu Industrial Park, Tianyuan District, Zhuzhou City, Hunan Province Patentee before: HUNAN CRRC TIMES ELECTRIC VEHICLE Co.,Ltd. Address after: 412007 Liyu Industrial Park, Tianyuan District, Zhuzhou City, Hunan Province Patentee after: HUNAN CRRC TIMES ELECTRIC VEHICLE Co.,Ltd. Address before: 412007 Liyu Industrial Park, Tianyuan District, Zhuzhou City, Hunan Province Patentee before: HUNAN CSR TIMES ELECTRIC VEHICLE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130821 |
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| CX01 | Expiry of patent term |