CN103825344A - Electric vehicle controller pre-charging circuit - Google Patents
Electric vehicle controller pre-charging circuit Download PDFInfo
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- CN103825344A CN103825344A CN201410111514.4A CN201410111514A CN103825344A CN 103825344 A CN103825344 A CN 103825344A CN 201410111514 A CN201410111514 A CN 201410111514A CN 103825344 A CN103825344 A CN 103825344A
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Abstract
The invention discloses an electric vehicle controller pre-charging circuit. A positive electrode of a diode D2 is connected to a key switch B+, and a negative electrode is connected to a resistor as well as a DC-DC switching power supply and one end of a resistor R10; the other end of the resistor R10 is connected to a drain electrode of a field-effect tube Q5; a source electrode of the field-effect tube Q5 is connected to a capacitor C, and a grid electrode is connected to one end of a resistor R13; the other end of the resistor R13 is connected to a photoelectric coupler U1. The pre-charging circuit disclosed by the invention reduces a voltage difference between vehicle power supply and capacitor when a conductor switch is turned on; after turning off the key switch B+, a micro control unit (MCU) is powered by the capacitor, and circuit is safely turned off, so as to avoid false action of the controller; the pre-charging circuit can achieve a purpose of discharging the capacitor, thus avoiding a discharging circuit and saving cost.
Description
Technical field
The present invention relates to a kind of controller for electric vehicle circuit, be specifically related to a kind of controller for electric vehicle pre-charge circuit.
Technical background
Thereby electric motor car reaches take storage battery as driven by energy machine operation the object that electric motor car is travelled, the work of electric vehicle motor is by motor controller controls, there is the much large electric capacity for filtering and voltage stabilizing the inside of electric machine controller, the large positive pole of electric capacity and the positive pole of storage battery are directly connected by contactless contactor, when direct closed contactless contactor, storage battery moment can be with very large electric current to capacitor charging, and it impacts can affect the life-span of electric capacity and the reliability of controller.
Therefore, in order to solve the above problems, there is at present following solution: by key switch control pre-charge circuit, after precharge completes, open total power switch by controller internal delay time control high-current relay again.This scheme efficiently solves the problem of instantaneous large-current to capacitor charging, but after closing switch, electric capacity is also charging saturation condition always, can affect the life-span of electric capacity and the reliability of controller, after key signal at stop, Switching Power Supply does not have voltage input in addition yet, Switching Power Supply is not worked, the control circuits such as single-chip microcomputer are not because having power supply to quit work, and now capacitor two ends still have very high voltage, so just have the danger of misoperation.
For overcoming the above problems, the present invention adopts new controller pre-charge circuit, for Darlington transistor, further reduces the voltage difference of electric capacity and vehicle power after precharge, the impulse current while reducing contactor adhesive by field effect pipe belt; Switching tube U1 adopts photoelectrical coupler, strong interference immunity; Save discharge circuit, after key signal at stop, supplied by electric capacity that single-chip microcomputer processing controller is every closes work, electric capacity electric weight is bled off simultaneously, take into account discharging function, safe and effective protection controller.
Summary of the invention
The present invention, for overcoming deficiency of the prior art, after closing key signal, utilizes electric capacity to power to single-chip microcomputer, has both solved the problem of capacitor discharge, has got rid of again the danger of controller misoperation.
For achieving the above object, technical scheme of the present invention is:
A kind of controller for electric vehicle charge-discharge circuit, is connected between key switch B+ and capacitor C, comprising:
Key switch B+ is connected with diode D2 is anodal;
The anodal key switch B+ that connects of diode D2, negative pole is connected with DC-DC Switching Power Supply one end, resistance R 10 one end;
DC-DC Switching Power Supply one end connects diode D2 negative pole, and the other end connects the input of MCU;
MCU input connects DC-DC Switching Power Supply one end, and output is connected with resistance R 15 one end;
Resistance R 10 one end are connected with diode D2 negative pole, other end connecting valve pipe Q5 one end;
Switching tube Q5 one end is connected with resistance R 10, the other end and resistance R 11 one end, capacitor C one end, PGND be connected;
Resistance R 12 one end connection+5V power supplys, other end contact resistance R14 one end;
Resistance R 14 one end contact resistance R12, the other end is connected with triode Q6 collector electrode;
Resistance R 15 1 termination MCU outputs, the other end is connected with resistance R 16 one end, triode Q6 base stage;
Resistance R 16 contact resistance R15 one end, one end, other end ground connection;
Triode Q6 grounded emitter;
Resistance R 11 1 termination switching tube Q5, resistance R 13 one end, other end ground connection PGND;
Resistance R 13 1 terminating resistor R11 one end, switching tube Q5, the other end is connected with switching tube U1;
Switching tube U1 mono-termination power P15V, the other end is connected with resistance R 13 one end;
Capacitor C one termination switching tube Q5 one end, PGND, other end ground connection.
Described switching tube Q5 is field effect transistor, and its source electrode connects capacitor C one end, resistance R 11 one end, PGND, the grid contact resistance R11 other end, R13 one end, drain electrode contact resistance R10 one end.
Described switching tube U1 is photoelectrical coupler, and its light emitting source is connected respectively with resistance R 14 two ends, and light-receiving device one end connects power supply P15V, and the other end is connected with resistance R 13 one end.
Compare existing pre-charge circuit, the present invention has remarkable advantage and beneficial effect, is embodied as:
Use this pre-charge circuit, can realize the electric discharge of electric capacity without otherwise designed discharge circuit, and process each output suitable closing in order by single-chip microcomputer, effectively prevent controller misoperation, the safety that can realize electric capacity discharges and recharges.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of existing controller for electric vehicle pre-charge circuit;
Fig. 2 is the circuit theory diagrams of controller for electric vehicle pre-charge circuit of the present invention.
Embodiment
Specific embodiment of the invention method is as follows:
If direct closed contactless contactor, vehicle power moment can be with very large electric current to capacitor charging, and it impacts can affect the life-span of electric capacity and the reliability of controller, so controller carried out precharge to electric capacity before closed contactless contactor under normal circumstances.
Fig. 1 is the circuit theory diagrams of existing controller for electric vehicle pre-charge circuit, and wherein: DC-DC Switching Power Supply one end connects key switch B+, the other end connects the input of MCU; MCU input connects DC-DC Switching Power Supply one end, and output is connected with resistance R 7 one end; Resistance R 7 other end contact resistance R8 one end, triode Q3 base stage; Resistance R 8 other end ground connection; Triode Q3 grounded emitter, collector electrode contact resistance R5 one end; Resistance R 5 other end contact resistance R2 one end, Darlington transistor Q1 base stage; Resistance R 2 another termination key switch B+; Darlington transistor Q1 emitter meets key switch B+, collector electrode connecting resistance R1 one end; Resistance R 1 another terminating diode D1 positive pole; Diode D1 negative pole connecting resistance R3 one end, resistance R 4 one end, capacitor C one end; Resistance R 3 another termination triode Q2 base stages, triode Q4 collector electrode; Resistance R 4 another termination triode Q2 collector electrodes; Triode Q2 grounded emitter; Triode Q4 base stage connecting resistance R6 one end, resistance R 9 one end, grounded emitter; Resistance R 9 other end ground connection; Resistance R 6 another termination key switch B+; Capacitor C other end ground connection.
DC-DC Switching Power Supply input connects key switch B+, after key switch B+ opens, is powered to MCU by DC-DC Switching Power Supply, MCU starts working, and controls Darlington transistor Q1 open-minded, and vehicle power is to capacitor C precharge, due to the existence of resistance R 1, charging current is not too large; In the time that key switch B+ turn-offs, DC-DC Switching Power Supply input does not have input voltage, and output voltage can decline rapidly, and MCU quits work, and now capacitor C both end voltage still has very high voltage, can not repid discharge, make the subsequent conditioning circuit can continuous firing a period of time, there is the danger of misoperation, and capacitor C can affect the electric capacity life-span in saturation condition for a long time, so generally can be provided with discharge circuit, as shown in FIG., the electric weight of capacitor C can consume by electronics R3, R4.
As Fig. 2, controller for electric vehicle pre-charge circuit of the present invention adopts field effect transistor Q5 to replace Darlington transistor Q1, be less than Darlington transistor collector electrode because field effect transistor drain electrode and source electrode both end voltage are poor and emitter both end voltage is poor, after precharge finishes, capacitor C cathode voltage can be higher than the voltage using when Darlington transistor, can make like this contactless contactor closed time, both end voltage is poor reduces, and the impulse current while reducing contactless contactor adhesive, extends the contactless contactor life-span; Remove diode D1, between key switch B+ and DC-DC Switching Power Supply, add diode D2, save discharge circuit, key switch B+ closes to have no progeny and utilizes capacitor C to power to maintain the normal work of MCU to DC-DC Switching Power Supply, what make that each components and parts of controller can be orderly closes, and can effectively discharge capacitor C electric weight, can guarantee again the safe operation of whole circuit, prevent misoperation, accomplish that safety discharges and recharges.
In the time of key switch B+ conducting, it is open-minded that MCU controls triode Q6, now there is current flowing resistance R14, resistance R 14 two ends produce voltage difference, and photoelectrical coupler U1 light emitting source two ends produce voltage difference, make the two ends conducting of photoelectrical coupler U1 light-receiving device, power supply P15V is is 15V with respect to a PGND voltage, triode Q5 grid voltage rises, triode Q5 conducting, and vehicle power is to capacitor C precharge; In the time that key switch B+ disconnects, capacitor C is powered to MCU, and it is normally worked, and guarantees the safety shutdown of whole circuit and can consume fast the electric weight of capacitor C, without otherwise designed discharge circuit, reaches the object of safe-discharge.
For being one exemplary embodiment of the present invention; should be understood to is a certain demonstrative example wherein in the protection range of claims of the present invention; there is the directiveness effect that those skilled in the art is realized to corresponding technical scheme, but not limitation of the invention.
Claims (3)
1. a controller for electric vehicle pre-charge circuit, is characterized in that: be connected between key switch B+ and capacitor C, comprise:
Key switch B+ is connected with diode D2 is anodal;
The anodal key switch B+ that connects of diode D2, negative pole is connected with DC-DC Switching Power Supply one end, resistance R 10 one end;
DC-DC Switching Power Supply one end connects diode D2 negative pole, and the other end connects the input of MCU;
MCU input connects DC-DC Switching Power Supply one end, and output is connected with resistance R 15 one end;
Resistance R 10 one end are connected with diode D2 negative pole, other end connecting valve pipe Q5 one end;
Switching tube Q5 one end is connected with resistance R 10, the other end and resistance R 11 one end, capacitor C one end, PGND be connected;
Resistance R 12 one end connection+5V power supplys, other end contact resistance R14 one end;
Resistance R 14 one end contact resistance R12, the other end is connected with triode Q6 collector electrode;
Resistance R 15 1 termination MCU outputs, the other end is connected with resistance R 16 one end, triode Q6 base stage;
Resistance R 16 contact resistance R15 one end, one end, other end ground connection;
Triode Q6 grounded emitter;
Resistance R 11 1 termination switching tube Q5, resistance R 13 one end, other end ground connection PGND;
Resistance R 13 1 terminating resistor R11 one end, switching tube Q5, the other end is connected with switching tube U1;
Switching tube U1 mono-termination power P15V, the other end is connected with resistance R 13 one end;
Capacitor C one termination switching tube Q5 one end, PGND, other end ground connection.
2. a kind of controller for electric vehicle pre-charge circuit according to claim 1, it is characterized in that: described switching tube Q5 is field effect transistor, its source electrode connects capacitor C one end, resistance R 11 one end, PGND, the grid contact resistance R11 other end, R13 one end, drain electrode contact resistance R10 one end.
3. a kind of controller for electric vehicle pre-charge circuit according to claim 1, it is characterized in that: described switching tube U1 is photoelectrical coupler, its light emitting source is connected respectively with resistance R 14 two ends, and light-receiving device one end connects power supply P15V, and the other end is connected with resistance R 13 one end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410111514.4A CN103825344A (en) | 2014-03-25 | 2014-03-25 | Electric vehicle controller pre-charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410111514.4A CN103825344A (en) | 2014-03-25 | 2014-03-25 | Electric vehicle controller pre-charging circuit |
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| CN103825344A true CN103825344A (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410111514.4A Pending CN103825344A (en) | 2014-03-25 | 2014-03-25 | Electric vehicle controller pre-charging circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992773A (en) * | 2016-01-21 | 2017-07-28 | 北京友信宏科电子科技有限公司 | The main contactor management circuit and method of a kind of electrical equipment |
| CN107768195A (en) * | 2016-08-18 | 2018-03-06 | 昆山国力源通新能源科技有限公司 | Pre-charge circuit built in D.C. contactor and its control method |
| CN109823180A (en) * | 2017-11-22 | 2019-05-31 | 上海汽车集团股份有限公司 | A kind of precharging circuit of power battery |
| CN110034549A (en) * | 2018-01-12 | 2019-07-19 | 通用汽车环球科技运作有限责任公司 | Large value capacitor inrush current limiting circuit |
| CN110957771A (en) * | 2019-08-07 | 2020-04-03 | 郑州嘉晨电器有限公司 | Pre-charging failure protection circuit for key switch |
| CN112009245A (en) * | 2019-05-29 | 2020-12-01 | 北京新能源汽车股份有限公司 | Control method and device for electrifying electric automobile and automobile |
-
2014
- 2014-03-25 CN CN201410111514.4A patent/CN103825344A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992773A (en) * | 2016-01-21 | 2017-07-28 | 北京友信宏科电子科技有限公司 | The main contactor management circuit and method of a kind of electrical equipment |
| CN107768195A (en) * | 2016-08-18 | 2018-03-06 | 昆山国力源通新能源科技有限公司 | Pre-charge circuit built in D.C. contactor and its control method |
| CN107768195B (en) * | 2016-08-18 | 2019-12-10 | 昆山国力源通新能源科技有限公司 | built-in pre-charging circuit of direct current contactor and control method thereof |
| CN109823180A (en) * | 2017-11-22 | 2019-05-31 | 上海汽车集团股份有限公司 | A kind of precharging circuit of power battery |
| CN109823180B (en) * | 2017-11-22 | 2022-04-26 | 上海汽车集团股份有限公司 | Pre-charging circuit of power battery |
| CN110034549A (en) * | 2018-01-12 | 2019-07-19 | 通用汽车环球科技运作有限责任公司 | Large value capacitor inrush current limiting circuit |
| CN112009245A (en) * | 2019-05-29 | 2020-12-01 | 北京新能源汽车股份有限公司 | Control method and device for electrifying electric automobile and automobile |
| CN112009245B (en) * | 2019-05-29 | 2022-07-08 | 北京新能源汽车股份有限公司 | Control method and device for electrifying electric automobile and automobile |
| CN110957771A (en) * | 2019-08-07 | 2020-04-03 | 郑州嘉晨电器有限公司 | Pre-charging failure protection circuit for key switch |
| CN110957771B (en) * | 2019-08-07 | 2022-03-01 | 河南嘉晨智能控制股份有限公司 | Pre-charging failure protection circuit for key switch |
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| C06 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140528 |
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| WD01 | Invention patent application deemed withdrawn after publication |