CN103490489A - Electric-vehicle charging device - Google Patents
Electric-vehicle charging device Download PDFInfo
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- CN103490489A CN103490489A CN201210199365.2A CN201210199365A CN103490489A CN 103490489 A CN103490489 A CN 103490489A CN 201210199365 A CN201210199365 A CN 201210199365A CN 103490489 A CN103490489 A CN 103490489A
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Abstract
The invention relates to an electric-vehicle charging device. The electric-vehicle charging device comprises a soft switching power conversion circuit, wherein the soft switching power conversion circuit comprises a full-bridge phase shift power conversion main circuit, an LLC resonance circuit, a rectifying circuit and a filtering circuit. The full-bridge phase shift power conversion main circuit comprises four switching transistors and a transformer, wherein the four switching transistors and the transformer are connected in series to form a loop, a front switching arm is formed by two switching transistors, and a rear switching arm is formed by the other two switching transistors. The LLC resonance circuit is respectively connected with the center point of the front switching arm and the center point of the rear switching arm, and the LLC resonance circuit comprises an excitation inductor. The rectifying circuit comprises a secondary side of the transformer and is connected with the filtering circuit. According to the electric-vehicle charging device, the soft switching power conversion circuit can enable switching transistors of a primary side of the transformer and rectifying diodes of the secondary side of the transformer to work in a no-voltage or no-current switching mode, no-voltage or no-current switching-on and switching-off of the circuits are achieved thoroughly, and switching loss of the soft switching power conversion circuit is reduced further.
Description
Technical field
The present invention relates to charging technique, particularly relate to a kind of charging device of electric automobile.
Background technology
Usually can relate to the power technology of increasing income in charging device of electric automobile.The power supply of increasing income can be realized by hard switching power conversion circuit or soft switch power translation circuit according to the difference of Technical Architecture.
Hard switching power conversion circuit (as switching tube etc.) is in the situation that bear voltage or electric current conducting or breaking circuit, thereby can produce larger loss in the process of the turn-on and turn-off circuit based on the hard switching power conversion, i.e. so-called switching loss.Due to operating state one timing at power supply, the loss that the hard switching power conversion circuit is opened or breaking circuit once produced is also certain, and therefore the frequency of the switching circuit based on the hard switching power conversion is higher, and switching loss is also just larger.In addition, based on the hard switching power conversion open or the process of breaking circuit also can evoke the vibration of circuit distributed inductance and parasitic capacitance, can bring supplementary load loss thus, and produce electromagnetic interference.Seen from the above description, the frequency of the conducting breaking circuit based on the hard switching power conversion can not be too high, and also need to take to prevent the measure of electromagnetic interference in circuit.
Soft switch power translation circuit (also can be called zero-voltage zero-current soft switch power inverter or soft switch power transformation device) open or the process of breaking circuit in, be that to add voltage thereon be zero (being the zero voltage switch circuit), or be to be zero (being the Zero Current Switch circuit) by its electric current.The mode of this switching circuit has reduced the circuit oscillation of opening the switching loss in the breaking circuit process and evoking very significantly, therefore, soft switching power can improve the frequency of opening breaking circuit significantly, having created condition for switching power source device miniaturization and high efficiency, is the switch power technology with development prospect.
The inventor finds in realizing process of the present invention: although that the implementation of soft switch power translation circuit has is multiple, and, various implementations are processed by continuous technical optimization, make the soft switch power translation circuit can work in preferably no-voltage or zero current switching mode, the switching tube that is the former limit of the transformer in the soft switch power translation circuit works in no-voltage or zero circuit switching mode, but the rectifier diode of the secondary of the transformer in the soft switch power translation circuit is but with the mode work of force the pass break all the time, and can not work in no-voltage or zero current mode, thereby exist reverse-recovery problems, in the force the pass break process, owing to there will be larger current changing rate (di/dt), therefore can produce very large reverse recovery voltage and current spike, thereby cause the power loss of rectifier diode to increase.
Because the technical problem that above-mentioned existing soft switch power translation circuit exists, the inventor is based on being engaged in this type of product design manufacture abundant practical experience and professional knowledge for many years, and the utilization of cooperation scientific principle, positive research and innovation in addition, to founding a kind of charging device of electric automobile with soft switch power translation circuit of new structure, can overcome the technical problem that existing soft switch power translation circuit implementation exists, make it have more practicality.Through continuous research and design, and, after repeatedly studying sample and improving, finally create the present invention who has practical value.
Summary of the invention
The object of the invention is to, overcome the problem that existing soft switch power translation circuit exists, and provide a kind of charging device of electric automobile with soft switch power translation circuit of new structure, technical problem to be solved is, make the switching tube on former limit of the transformer in the soft switch power translation circuit and the rectifier diode of secondary all work in no-voltage or zero current switching mode, make the soft switch power translation circuit realize thoroughly no-voltage and zero current turning-on and breaking circuit, thereby further reduce the switching loss of soft switch power translation circuit.
The object of the invention to solve the technical problems can adopt following technical scheme to realize.
A kind of charging device of electric automobile proposed according to the present invention comprises: the soft switch power translation circuit, and described soft switch power translation circuit comprises: full-bridge phase shifting power transforming main circuit, LLC resonant circuit, rectification circuit and filter circuit; The full-bridge phase shifting power transforming main circuit comprises: transformer, be concatenated into four switching tube S1, S2, S3 and the S4 in loop, wherein two adjacent switching tubes form the switch forearm, two other switching tube forms switch postbrachium, and described transformer is arranged between the central point of the central point of described switch forearm and switch postbrachium; Described LLC resonant circuit is connected respectively with the central point of switch postbrachium with the central point of described switch forearm, and described LLC resonant circuit comprises the magnetizing inductance Lm of described transformer; Described rectification circuit comprises the secondary of described transformer, and described rectification circuit is connected with described filter circuit.
Purpose of the present invention and solve its technical problem and can also be further achieved by the following technical measures.
Preferably, aforesaid charging device of electric automobile, wherein switching tube comprises: field-effect transistor.
Preferably, aforesaid charging device of electric automobile, wherein said LLC resonant circuit comprises: the magnetizing inductance Lm of the inductance L S of series connection, described transformer and capacitor C s.
Preferably, aforesaid charging device of electric automobile, wherein said rectification circuit comprises: the secondary of rectifier diode D1, D2, D3 and D4 and described transformer, after rectifier diode D1 and D2 series connection, with the rectifier diode D3 connected and D4 parallel connection, the secondary of described transformer is connected between the rectifier diode D1 and D2 of series connection on the one hand, is connected on the other hand between the rectifier diode D3 and D4 of series connection.
Preferably, aforesaid charging device of electric automobile, wherein said filter circuit comprises: capacitor C o, electrochemical capacitor Eo and photo resistance RL, parallel with one another between described capacitor C o, electrochemical capacitor Eo and this three of photo resistance RL.
Preferably, aforesaid charging device of electric automobile, wherein said soft switch power translation circuit also comprises: capacitor C s1, Cs2, Cs3 and Cs4, described capacitor C s1 is in parallel with switching tube S1, described capacitor C s2 is in parallel with switching tube S2, described capacitor C s3 is in parallel with switching tube S3, and described capacitor C s4 is in parallel with switching tube S4.
By technique scheme, charging device of electric automobile of the present invention at least has following advantages and beneficial effect: the present invention connects as four switching tubes formation full-bridge phase shifting power transforming main circuits in loop by utilization, and between the central point of the central point of switch forearm and switch postbrachium, the LLC resonant circuit is set, formed a kind of circuit topological structure of novel full-bridge phase shifting LLC resonant type soft-switch power conversion technology, this circuit topological structure is a kind of four switches and two half-wave combining structure, this structure takes full advantage of the feature of circuit itself, make the performance advantage of different circuit structures carry out complementation, thereby form a kind of compound modulation, complete by the frequency of oscillation of regulating ON time the also amplitude of regulated output voltage of regulating, and then make the switching tube of transformer primary side and the rectifier diode circuit of secondary all can realize Zero switching loss, soft switch power translation circuit in final charging device of electric automobile of the present invention has thoroughly been realized no-voltage and zero current turning-on and breaking circuit, has further reduced the switching loss of soft switch power translation circuit, is very suitable for practicality.
In sum, the present invention has significant progress technically, and has significantly positive technique effect, becomes a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
The accompanying drawing explanation
The circuit diagram that Fig. 1 is the soft switch power translation circuit in charging device of electric automobile of the present invention.
Embodiment
Reach for further setting forth the present invention technological means and the effect that predetermined goal of the invention is taked, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of charging device of electric automobile, structure, feature and effect thereof that foundation the present invention is proposed, be described in detail as follows.
Existing charging device of electric automobile all includes the parts such as protective circuit, supervisory circuit, accessory power supply and soft switch power translation circuit usually.Protective circuit wherein can comprise: input overvoltage/undervoltage circuit, output overvoltage/undervoltage circuit, output overcurrent protective circuit, output short circuit protection, input overcurrent protection circuit, input open-phase protection circuit and thermal-shutdown circuit etc.; Supervisory circuit wherein can comprise: output voltage controlling circuit and output current control circuit etc.Because the present invention improves the soft switch power translation circuit in charging device of electric automobile, therefore, a concrete structure to the soft switch power translation circuit describes in the present embodiment, and in the concrete structure of charging device of electric automobile and charging device of electric automobile, the concrete structure of other circuit parts except the soft switch power translation circuit does not elaborate at this.
The circuit structure of the soft switch power translation circuit in the charging device of electric automobile of the present embodiment as shown in Figure 1.
Soft switch power translation circuit shown in Fig. 1 mainly comprises: full-bridge phase shifting power transforming main circuit, LLC resonant circuit, rectification circuit, filter circuit and four capacitor C s1, Cs2, Cs3 and Cs4.
Above-mentioned full-bridge phase shifting power transforming main circuit mainly comprises: transformer T and four switching tube S1, S2, S3 and S4, and these four switching tubes are concatenated into loop; Wherein, switching tube S1 and S2 form the switch forearm of soft switch power translation circuit, and two other switching tubes are the switch postbrachium that switching tube S3 and S4 form the soft switch power translation circuit.Switch forearm and switch postbrachium have formed full-bridge phase shifting power switch model, and the driving signal of this model can be the complementary signal of fixing<50% duty ratio.
Switching tube S1 is in parallel with capacitor C s1, and switching tube S2 is in parallel with capacitor C s2, and switching tube S3 is in parallel with capacitor C s3, and switching tube S4 is in parallel with capacitor C s4.
Four switching tubes in the present invention can be specially four switching field effect transistors (being metal-oxide-semiconductor) or other switch elements.
One end of LLC resonant circuit (also can be called the LLC resonant network) is connected with the central point of switch forearm (being between switching tube S1 and S2), and the other end of LLC resonant circuit is connected with the central point (being between switching tube S3 and S4) of switch postbrachium.
The LLC resonant circuit mainly comprises: inductance L S(also can be called resonant inductance LS), magnetizing inductance Lm and the capacitor C s(of transformer T also can be called resonant capacitance Cs), and the magnetizing inductance Lm of inductance L S, transformer T and capacitor C s three series connection.Capacitor C s can play the effect of isolated DC.
The present invention, by the resonance effect between the magnetizing inductance Lm of inductance L S, capacitor C s and transformer T, has realized no-voltage (ZVS) and zero current (ZCS) the connection circuit of soft switch power translation circuit.
Rectification circuit mainly comprises: the secondary of rectifier diode D1, D2, D3 and D4 and transformer T, the secondary of rectifier diode D1, D2, D3 and D4 and transformer T; Wherein, rectifier diode D1 and D2 series connection, rectifier diode D3 and D4 series connection, rectifier diode D1 after series connection and D2 with connect after rectifier diode D3 and D4 parallel connection, the secondary of transformer T is connected with the rectifier diode D1 of series connection and the intermediate point (being between rectifier diode D1 and D2) of D2 on the one hand, also with the rectifier diode D3 of series connection and the intermediate point (being between rectifier diode D3 and D4) of D4, is connected on the other hand.
Filter circuit mainly comprises: capacitor C o, electrochemical capacitor Eo and photo resistance RL, and parallel with one another between capacitor C o, electrochemical capacitor Eo and this three of photo resistance RL.The output ripple of this filter circuit can be less than 0.5%.
The present invention is by increasing the resonant circuit be comprised of resonant elements such as inductance and electric capacity at the full-bridge phase shifting power transforming main circuit, thereby before and after the switching circuit process, resonant capacitance and resonant inductance produce resonance, and the electric current (or voltage) in the soft switch power translation circuit is changed according to the rule of sine or quasi sine fully.When electric current first drops to zero, voltage slowly rises to the off-state value again, and like this, the turn-off power loss of switch is approximately zero.Because soft switch power translation circuit its inner electric current before breaking circuit has dropped to zero, therefore, effectively solved perceptual shutoff problem.When voltage zero-cross, electric current slowly rises to the on-state value again, and like this, the turn-on consumption of switch is approximately zero, because the voltage on electric capacity is also zero, therefore, has effectively solved capacitive and has opened problem.Thus, the present invention makes switching tube (metal-oxide-semiconductor) conducting under zero-voltage state on the former limit of transformer T, and the rectifier diode of the secondary of transformer is operated under the state of interrupted or critical discontinuous, has avoided reverse-recovery problems, also no longer includes due to voltage spikes and produces.The appearance of the bad phenomenon such as high-frequency noise loss, EMI and EMC that final the present invention has avoided switch stress and diode reverse recovery to bring, realized the Zero switching loss of approximate ideal, overall efficiency can be reached more than 97%, improved overall efficiency.
The above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit technical scheme of the present invention, any those skilled in the art are in the scope that does not break away from technical solution of the present invention, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (6)
1. a charging device of electric automobile comprises: the soft switch power translation circuit, it is characterized in that, and described soft switch power translation circuit comprises: full-bridge phase shifting power transforming main circuit, LLC resonant circuit, rectification circuit and filter circuit;
Described full-bridge phase shifting power transforming main circuit comprises: transformer, be concatenated into four switching tube S1, S2, S3 and the S4 in loop, wherein two adjacent switching tubes form the switch forearm, two other switching tube forms switch postbrachium, and described transformer is arranged between the central point of the central point of described switch forearm and switch postbrachium;
Described LLC resonant circuit is connected respectively with the central point of switch postbrachium with the central point of described switch forearm, and described LLC resonant circuit comprises the magnetizing inductance Lm of described transformer;
Described rectification circuit comprises the secondary of described transformer, and described rectification circuit is connected with described filter circuit.
2. charging device of electric automobile according to claim 1, is characterized in that, described switching tube comprises: field-effect transistor.
3. charging device of electric automobile according to claim 1, is characterized in that, described LLC resonant circuit comprises: the magnetizing inductance Lm of the inductance L S of series connection, described transformer and capacitor C s.
4. charging device of electric automobile according to claim 1, it is characterized in that, described rectification circuit comprises: the secondary of rectifier diode D1, D2, D3 and D4 and described transformer, after rectifier diode D1 and D2 series connection, with the rectifier diode D3 connected and D4 parallel connection, the secondary of described transformer is connected between the rectifier diode D1 and D2 of series connection on the one hand, is connected on the other hand between the rectifier diode D3 and D4 of series connection.
5. charging device of electric automobile according to claim 1, is characterized in that, described filter circuit comprises: capacitor C o, electrochemical capacitor Eo and photo resistance RL, and parallel with one another between described capacitor C o, electrochemical capacitor Eo and this three of photo resistance RL.
6. according to the described charging device of electric automobile of arbitrary claim in claim 1 to 5, it is characterized in that, described soft switch power translation circuit also comprises: capacitor C s1, Cs2, Cs3 and Cs4, described capacitor C s1 is in parallel with switching tube S1, described capacitor C s2 is in parallel with switching tube S2, described capacitor C s3 is in parallel with switching tube S3, and described capacitor C s4 is in parallel with switching tube S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199365.2A CN103490489A (en) | 2012-06-13 | 2012-06-13 | Electric-vehicle charging device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199365.2A CN103490489A (en) | 2012-06-13 | 2012-06-13 | Electric-vehicle charging device |
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| CN103490489A true CN103490489A (en) | 2014-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210199365.2A Pending CN103490489A (en) | 2012-06-13 | 2012-06-13 | Electric-vehicle charging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904901A (en) * | 2014-03-28 | 2014-07-02 | 成都芯通科技股份有限公司 | Phase-shift full-bridge converter circuit and control method |
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|---|---|---|---|---|
| US6246599B1 (en) * | 2000-08-25 | 2001-06-12 | Delta Electronics, Inc. | Constant frequency resonant inverters with a pair of resonant inductors |
| CN101075784A (en) * | 2007-06-21 | 2007-11-21 | 艾默生网络能源有限公司 | Zero-voltage DC/DC switch circuit with phase-shift control |
| CN102347704A (en) * | 2010-07-29 | 2012-02-08 | 上海儒竞电子科技有限公司 | Low voltage push-pull inversion direct DC-AC conversion circuit |
| CN202634278U (en) * | 2012-06-13 | 2012-12-26 | 洛阳嘉盛电源科技有限公司 | Electric car charging device |
-
2012
- 2012-06-13 CN CN201210199365.2A patent/CN103490489A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6246599B1 (en) * | 2000-08-25 | 2001-06-12 | Delta Electronics, Inc. | Constant frequency resonant inverters with a pair of resonant inductors |
| CN101075784A (en) * | 2007-06-21 | 2007-11-21 | 艾默生网络能源有限公司 | Zero-voltage DC/DC switch circuit with phase-shift control |
| CN102347704A (en) * | 2010-07-29 | 2012-02-08 | 上海儒竞电子科技有限公司 | Low voltage push-pull inversion direct DC-AC conversion circuit |
| CN202634278U (en) * | 2012-06-13 | 2012-12-26 | 洛阳嘉盛电源科技有限公司 | Electric car charging device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904901A (en) * | 2014-03-28 | 2014-07-02 | 成都芯通科技股份有限公司 | Phase-shift full-bridge converter circuit and control method |
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Application publication date: 20140101 |