CN102570795B - Vehicular electric power source device and DC-to-DC converter thereof - Google Patents
Vehicular electric power source device and DC-to-DC converter thereof Download PDFInfo
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- CN102570795B CN102570795B CN201210012023.5A CN201210012023A CN102570795B CN 102570795 B CN102570795 B CN 102570795B CN 201210012023 A CN201210012023 A CN 201210012023A CN 102570795 B CN102570795 B CN 102570795B
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Abstract
The embodiment of the present invention discloses a kind of DC-to-DC converter, and this DC-to-DC converter comprises: an input stage, comprises the first positive pole and the first negative pole, and this first positive pole is for receiving an input voltage; An output stage, comprises the second positive pole and the 3rd positive pole, and this second positive pole and described first positive pole couple, for exporting an output voltage according to described input voltage; And at least one energy feedback level, be coupled between described input stage and described 3rd positive pole, portion of energy for output stage being exported feeds back to described first positive pole, and the input voltage of described input stage equals the output voltage of described output stage and the voltage sum of described 3rd positive pole.The present invention also provides a kind of vehicular electric power source device adopting this DC-to-DC converter.The power conversion efficiency of this DC-to-DC converter improves, thus can improve the efficiency of vehicular electric power source device simultaneously.
Description
Technical field
The present invention relates to supply unit, particularly relate to vehicular electric power source device and DC-to-DC converter thereof.
Background technology
Existing Vehicular charger is nearly all isolated form, and efficiency is roughly about 90%-93%, because shed heat is comparatively large, must take to force cooling provision.Under water-cooling pattern and air cooling way, noise, abrasion exist, and the actual life of fan is not long, thus can shorten the life-span of full car further.So two kinds of conventional chilling modes (air-cooled, water-cooled) of Vehicular charger are not the type of cooling the most practical.Facts have proved, the natural air cooled operation of Vehicular charger is only the most practical type of cooling.But realize natural air cooled operation, the overall power conversion efficiency of Vehicular charger must be promoted to more than 96%.
Existing Vehicular charger system generally includes two important component parts: the power conversion topologies structure of power factor correction (PFC) level and DC-DC power conversion main circuit.The PFC topological structure that the power conversion topologies structure of PFC level generally selects two road misphases, continuous mode to run, usual power conversion efficiency reaches as high as 97%-98%.To ask the complete machine full load efficiency of Vehicular charger to reach more than 96%, then the power conversion efficiency of DC-DC power conversion main circuit also must reach 98%-99%.But the power conversion efficiency not yet having the DC-DC power of any one isolated form to convert main circuit at present can reach 98%-99%.
Summary of the invention
In order to solve the problems of the technologies described above, be necessary to provide a kind of power conversion efficiency that can make can reach the DC-to-DC converter of 98%-99% and adopt the vehicular electric power source device of this DC-to-DC converter.
The embodiment of the present invention provides a kind of DC-to-DC converter, and this DC-to-DC converter comprises: an input stage, comprises the first positive pole and the first negative pole, and this first positive pole is for receiving an input voltage; An output stage, comprises the second positive pole and the 3rd positive pole, and this second positive pole and described first positive pole couple, for exporting an output voltage according to described input voltage; And at least one energy feedback level, be coupled between described input stage and described 3rd positive pole, portion of energy for output stage being exported feeds back to described first positive pole, and the input voltage of described input stage equals the output voltage of described output stage and the voltage sum of described 3rd positive pole.
The embodiment of the present invention also provides a kind of vehicular electric power source device, and it comprises: power factor correction module, for receiving mains supply and exporting first output voltage; DC-to-DC converter, for receiving this this first output voltage and being converted into the second output voltage, described first output voltage is greater than described second output voltage; Protective circuit, for carrying out overcurrent protection to described DC-to-DC converter; And control module, for the curtage controlling described power factor correction module according to programming signal, DC-to-DC converter exports, with output constant current or constant voltage.This DC-to-DC converter comprises: an input stage, comprises the first positive pole and the first negative pole, and this first positive pole is for receiving described first input voltage; An output stage, comprises the second positive pole and the 3rd positive pole, and this second positive pole and described first positive pole couple, for exporting one second output voltage according to described first input voltage; And at least one energy feedback level, be coupled between described input stage and described output stage, portion of energy for output stage being exported feeds back to described first positive pole, and the first input voltage of described input stage equals the second output voltage of described output stage and the voltage sum of described 3rd positive pole.
The DC-to-DC converter of vehicular electric power source device provided by the invention and employing thereof, by the first positive pole is connected with output stage, and at energy source feedback unit to input stage feedback energy, thus improve the conversion efficiency of DC-to-DC converter and the power conversion efficiency of whole vehicular electric power source device.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the DC-to-DC converter that first embodiment of the invention provides;
Fig. 2 is the electrical block diagram of the DC-to-DC converter that second embodiment of the invention provides;
Fig. 3 is the structural representation of the DC-to-DC converter that third embodiment of the invention provides;
Fig. 4 is the structural representation of the DC-to-DC converter that four embodiment of the invention provides;
Fig. 5 is the structural representation of the vehicular electric power source device that embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In embodiments of the present invention, the input of DC-to-DC converter obtains input voltage from power factor correction (PFC) change-over circuit, and at output output voltage to load end, feedback energy is to input simultaneously, thus can improve delivery efficiency.
Refer to Fig. 1, it is the structural representation of the DC-to-DC converter 100 that first embodiment of the invention provides.In the present embodiment, described DC-to-DC converter 100 is non-isolation type changed power device.This DC-to-DC converter 100 comprises an input stage 10, output stage 20 and at least one energy feedback level 30.
Described input stage 10 comprises the first positive pole 11 and the first negative pole 13, and this first positive pole 11 is for receiving an input voltage.In present embodiment, described first positive pole 11 receives described input voltage from a power factor correction (PFC) change-over circuit (referring to Fig. 5), and described input voltage is that a line voltage is converted to through described PFC change-over circuit.
Described output stage 20 is for exporting an output voltage according to described input voltage, and described output voltage is less than described input voltage.Described output stage 20 comprises the second positive pole 21 and the 3rd positive pole 23, and this second positive pole 21 couples with described first positive pole 11, thus makes described second positive pole 21 also can obtain described input voltage.Described 3rd positive pole 23 connects described energy feedback level 30 one end, what make a part of described input voltage outputs to described output stage 20, other a part of input voltage then via described 3rd positive pole 23, is input in described energy feedback level 30, and forming energy feedback.
In present embodiment, the quantity of described energy feedback level 30 is one.Described energy feedback level 30 is coupled between described input stage 10 and described output stage 20.Concrete, described energy feedback level 30 is while couple described 3rd positive pole 23 and an earth terminal 31, to input the voltage of described 3rd positive pole 23 to realize energy feedback, another side then couples described first positive pole 11, with by described energy feedback to described input stage 10.Described earth terminal 31 is by described first negative pole 13 ground connection.
Refer to Fig. 2, the structural representation of its DC-to-DC converter 200 provided for second embodiment of the invention.The DC-to-DC converter 200 of the second embodiment is substantially identical with the DC-to-DC converter 100 of the first embodiment, and its difference is:
Described input stage 10 specifically comprises one first electric capacity 15, described first electric capacity 15 two ends connect described first positive pole 11 and the first negative pole 13 respectively, namely described first electric capacity 15 is connected in parallel in described input stage 10, described first electric capacity 15 both end voltage is made to equal described input voltage, thus the stored energy of described input voltage can be got up, and export in described output stage 20.In the present embodiment, described first electric capacity 15 is an electrochemical capacitor.
Described output stage 20 comprises one second electric capacity 25, described second electric capacity 25 two ends connect described second positive pole 21 and the 3rd positive pole 23 respectively, namely described second electric capacity 25 is connected in parallel in described output stage 20, described second electric capacity 25 both end voltage is made to equal described output voltage, thus the stored energy of described output voltage can be got up, and export load end (not shown) to.In the present embodiment, described second electric capacity 25 is an electrochemical capacitor.
Described energy feedback level 30 comprises input part 33, change-over circuit 35 and an efferent 37.Described input part 33 couples described 3rd positive pole 23 and described earth terminal 31, for receiving the energy of the described input voltage of part obtained from described output stage 20.Described efferent 37 couples described first positive pole 11 and described first negative pole 13, for by the energy feedback after described change-over circuit 35 to described input stage 10.Described change-over circuit 35 for receiving the energy of described input part 33, and outputs to this first positive pole 11 by after this power conversion from this efferent 37.Concrete, described change-over circuit 35 comprises one the 3rd electric capacity 351,1 the 4th electric capacity 353, one switch 355, diode 357 and an inductance 359, described 3rd electric capacity 351, the 4th electric capacity 353 and switch 355 are parallel with one another, described diode 357 is connected between described 3rd electric capacity 351 and switch 355, and described inductance 359 is connected between described 4th electric capacity 353 and switch 355.
Concrete, described 3rd electric capacity 351 comprises the 4th positive pole 351a and the 3rd negative pole 351b, and it for receiving the voltage of described 3rd positive pole 23, and charges.
Described 4th electric capacity 353 comprises the 5th positive pole 353a and the 4th negative pole 353b, and described 5th positive pole 353a and described 3rd negative pole 351b is connected to described earth terminal 31 jointly.
In the present embodiment, described switch 355 is insulated gate bipolar transistor.Described switch 355 comprises grid, launches collection and collector electrode, and described grid connects an external control signal (not shown), and described transmitting collection connects described earth terminal 31, and described collector electrode is connected between described diode 357 and inductance 359.
The positive pole of described diode 357 connects described inductance 359, and the negative pole of described diode 357 connects the 4th negative pole 353b and first positive pole 11 of described 4th electric capacity 353.
Described inductance 359 one end connects the 4th positive pole 351a of described 3rd electric capacity 351, and one end connects the collector electrode of described insulated gate bipolar transistor and the positive pole of described diode 357 in addition.
The conversion efficiency of described DC-to-DC converter 100 meets following formula:
η=C1+W*C2，（1）
Wherein, η is conversion efficiency, C1 is the percentage that the output voltage of described output stage 20 accounts for the input voltage of input stage 10, and C2 is the percentage that the voltage of the 3rd positive pole 23 accounts for the input voltage of input stage 10, W be the 3rd positive pole 23 voltage by after described energy feedback level 30 loss factor.Described formula (1) obtains from following formula:
η=Iout*Vpfc*C1+W*Iout*Vpfc*C2（2）
Wherein, Iout is the electric current flowing through DC-to-DC converter 100, and Vpfc is the output voltage of described PFC change-over circuit 35, the i.e. input voltage of input stage 10.
Composition graphs 3 and above-mentioned formula, when being reference point of potential with earth terminal 31, the input voltage of input stage 10 is substantially equal to the voltage of described second positive pole 21 and the voltage sum of the 3rd positive pole 23, that is:
Vpfc=Vdco+V
EFin，（3）
Wherein Vdco is the output voltage of DC-DC converter output stage 20, i.e. the voltage of the second positive pole 21, V
eFinfor the voltage of described 3rd positive pole 23, the i.e. input voltage of described energy feedback level 30.
Can be obtained by (3), V
eFin=Vpfc – Vdco(4)
(4) are substituted into (2) and can efficiency eta be calculated.Such as, V is worked as
eFinwhen accounting for 20% of Vpfc, the gross efficiency of DC-DC converter is:
(Iout*0.8*Vpfc+95%*Iout*20%*Vpfc）/(Io*Vpfc)=99%;
Work as V
eFinwhen accounting for 40% of Vpfc, the gross efficiency of DC-DC converter is:
(Io*0.8*VPFC+95%*Io*40%*VPFC）/(Io*VPFC)=98%。In the ordinary course of things, due to V
eFinthe percentage accounting for Vpfc can control, in 0 ~ 50% scope, therefore efficiency eta can be limited in the scope of 97% ~ 99%, thus can improve the power conversion efficiency of DC-to-DC converter 100.
Refer to Fig. 3, the structural representation of its DC-to-DC converter 300 provided for third embodiment of the invention.The DC-to-DC converter 300 of the 3rd embodiment is substantially identical with the DC-to-DC converter 200 of the second embodiment, its difference is: the quantity of described energy feedback level 30a is multiple, and the plurality of energy feedback level 30a is connected in parallel between described 3rd positive pole 23a and the first positive pole 11a successively.
Refer to Fig. 4, the structural representation of its DC-to-DC converter 400 provided for fourth embodiment of the invention.The DC-to-DC converter 400 of the 4th embodiment is substantially identical with the DC-to-DC converter 200 of the second embodiment, its difference is: the quantity of described energy feedback level 30b is multiple, and the plurality of energy feedback level 30b is connected between described 3rd positive pole 23b and the first positive pole 11b.
DC-to-DC converter of the present invention is not limited to the mode that multiple energy feedback level is Multiphase Parallel or series operation, as frequency inphase operation or run with frequently misphase or independent operating or run depending on conditions such as watt levels separately.
Refer to Fig. 5, the structural representation of its vehicular electric power source device 500 provided for embodiment of the present invention.This vehicular electric power source device 500 comprises power factor correction (PFC) module 51, above-mentioned DC-to-DC converter, protective circuit 53 and control module 55.
Described power factor correction module 51 for reducing input current harmonic wave and export one first output voltage, described first output voltage equals the input voltage of described input stage 10.
Described DC-to-DC converter is above-mentioned DC-to-DC converter 100,200,300 or 400.
Described protective circuit 53 is for carrying out overcurrent protection to described DC-to-DC converter.
Described control module 55 for control according to programming signal described power factor correction module 51, DC-to-DC converter export curtage, with output constant current or constant voltage.In present embodiment, described control module 55 is digital signal processor (DSP) or analog control circuit.In addition, this vehicular electric power source device 500 is also provided with a standby power 57, and it connects described control module 55, to provide the clock power of control module 55 and the control power supply when vehicular electric power source device 500 is in holding state.
Vehicular electric power source device 500 provided by the invention and the DC-to-DC converter adopted thereof, by the first positive pole 11 is connected with output stage 20, and feed back the voltage of the 3rd positive pole 23 in energy feedback level 30 to input stage 10, higher input voltage can be obtained, thus improve the conversion efficiency of DC-to-DC converter 100 and the power conversion efficiency of whole vehicular electric power source device 500.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (8)
1. a DC-to-DC converter, is characterized in that, this DC-to-DC converter comprises:
An input stage, comprises the first positive pole and the first negative pole, and this first positive pole is for receiving an input voltage;
An output stage, comprises the second positive pole and the 3rd positive pole, and this second positive pole and described first positive pole couple, for exporting an output voltage according to described input voltage; And
At least one energy feedback level, be coupled between described first positive pole and described 3rd positive pole, portion of energy for output stage being exported feeds back to described first positive pole, and the input voltage of described input stage equals the output voltage of described output stage and the voltage sum of described 3rd positive pole;
Described input stage comprises one first electric capacity, and described first electric capacity two ends connect described first positive pole and the first negative pole respectively, and described first electric capacity both end voltage equals described input voltage.
2. DC-to-DC converter as claimed in claim 1, it is characterized in that: described output stage comprises one second electric capacity, described second electric capacity two ends connect described second positive pole and the 3rd positive pole respectively, and described second electric capacity both end voltage equals described output voltage.
3. DC-to-DC converter as claimed in claim 1, it is characterized in that: the quantity of described energy feedback level is multiple, the plurality of energy feedback level is parallel with one another between described 3rd positive pole and the first positive pole.
4. DC-to-DC converter as claimed in claim 1, it is characterized in that: the quantity of described energy feedback level is multiple, the plurality of energy feedback level is connected between described 3rd positive pole and the first positive pole.
5. DC-to-DC converter as claimed in claim 3, it is characterized in that: each described energy feedback level comprises an input, a change-over circuit and an output, described input couples described 3rd positive pole, described output couples described first positive pole, described change-over circuit for receiving the energy of described input, and outputs to this first positive pole by after this power conversion from this output.
6. DC-to-DC converter as claimed in claim 5, it is characterized in that: described change-over circuit comprises the 3rd electric capacity, the 4th electric capacity, switch, a diode and an inductance, described 3rd electric capacity, the 4th electric capacity and switch are parallel with one another, described Diode series is the described 3rd between electric capacity and switch, and described inductance is connected on the described 4th between electric capacity and switch.
7. DC-to-DC converter as claimed in claim 1, is characterized in that: the conversion efficiency of described DC-to-DC converter meets following formula:
η=C1+W*C2, wherein, η is conversion efficiency, and C1 is the percentage that output voltage accounts for input voltage, and C2 is the percentage that the voltage of the 3rd positive pole accounts for input voltage, W be the 3rd positive pole voltage by after described energy feedback level loss factor.
8. a vehicular electric power source device, it comprises:
Power factor correction module, for receiving mains supply and exporting first output voltage;
DC-to-DC converter, for receiving this first output voltage and being converted into second output voltage, described first output voltage is greater than described second output voltage;
Protective circuit, for carrying out overcurrent protection to described DC-to-DC converter; And
Control module, for the curtage controlling described power factor correction module according to programming signal, DC-to-DC converter exports, with output constant current or constant voltage;
It is characterized in that, this DC-to-DC converter comprises:
An input stage, comprises the first positive pole and the first negative pole, and this first positive pole is for receiving described first input voltage;
An output stage, comprises the second positive pole and the 3rd positive pole, and this second positive pole and described first positive pole couple, for exporting one second output voltage according to described first input voltage; And
At least one energy feedback level, be coupled between described first positive pole and described 3rd positive pole, portion of energy for output stage being exported feeds back to described first positive pole, and the first input voltage of described input stage equals the second output voltage of described output stage and the voltage sum of described 3rd positive pole;
Described input stage comprises one first electric capacity, and described first electric capacity two ends connect described first positive pole and the first negative pole respectively, and described first electric capacity both end voltage equals described input voltage.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4695936A (en) * | 1986-02-07 | 1987-09-22 | Astec Components, Ltd. | Switching mode power supply start circuit |
| CN1462107A (en) * | 2002-05-30 | 2003-12-17 | Nec东金株式会社 | Mixed power-supply system |
| CN202435265U (en) * | 2012-01-16 | 2012-09-12 | 深圳市欣锐特科技有限公司 | Vehicle-mounted power supply device and direct current-direct current (DC-DC) converter thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2857331Y (en) * | 2005-11-25 | 2007-01-10 | 左宗来 | Vehicle power source of notepad computer |
| JP4968596B2 (en) * | 2008-11-12 | 2012-07-04 | 三菱電機株式会社 | In-vehicle power supply |
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- 2012-01-16 CN CN201210012023.5A patent/CN102570795B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4695936A (en) * | 1986-02-07 | 1987-09-22 | Astec Components, Ltd. | Switching mode power supply start circuit |
| CN1462107A (en) * | 2002-05-30 | 2003-12-17 | Nec东金株式会社 | Mixed power-supply system |
| CN202435265U (en) * | 2012-01-16 | 2012-09-12 | 深圳市欣锐特科技有限公司 | Vehicle-mounted power supply device and direct current-direct current (DC-DC) converter thereof |
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