CN103311902B - Over-current protection circuit of controller of motor of automobile - Google Patents
Over-current protection circuit of controller of motor of automobile Download PDFInfo
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- CN103311902B CN103311902B CN201310233074.5A CN201310233074A CN103311902B CN 103311902 B CN103311902 B CN 103311902B CN 201310233074 A CN201310233074 A CN 201310233074A CN 103311902 B CN103311902 B CN 103311902B
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Abstract
The invention discloses an over-current protection circuit of a controller of a motor of an automobile. The over-current protection circuit comprises a trigger holding circuit and a reset circuit. The trigger holding circuit is connected with a trigger signal output end of an over-current judgment circuit, the reset circuit is connected with the trigger holding circuit, an input end of the reset circuit is further connected with a reset signal output end of a master control chip of the motor, and an output end of the trigger holding circuit is further connected with a driving chip of a power device. The over-current protection circuit has the advantages of high response speed, low cost and the like, and can timely protect the power device.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of over-current protection circuit of controller of motor of automobile.
Background technology
The core devices of new-energy automobile electric machine controller is MOSFET or IGBT constant power device, and its development trend is big current, high-power.The modal damage type of power device is overcurrent damage, therefore measures accurately the output current of electric machine controller and on the basis of Measurement accuracy, carries out reliable overcurrent protection for ensureing that electric machine controller trouble free service is particularly important.
The high-precision current sensor of current dependence can be measured the electric current of controller accurately, but overcurrent protection form conventional is at present rely on software detection to carry out overcurrent protection or rely on the supersaturation of integrated drive chips to detect to carry out simple overcurrent protection.
The reaction speed of carrying out overcurrent protection after software detection is slower; the generation of power device overcurrent can not be measured in time; turn off output signal after detecting again and also need the long period; and power device is very short from spending the time flowing to damage, therefore software protection can not well for power device provides overcurrent protection.The supersaturation of integrated drive chips detects and can fast detecting turn off fast, but cannot set overcurrent protection value, and can not provide overcurrent protection to power device well when lasting big current does not produce supersaturation.
Summary of the invention
The technical problem to be solved in the present invention is just: the problems referred to above existed for prior art; the invention provides the current foldback circuit that a kind of response time is short, cost is low, versatility is good; the present invention can be electric machine controller power device and provides hardware overcurrent protection fast; can free setting motor controller overcurrent protective current value, ensure electric machine controller safe and highly efficient operation.
For achieving the above object; a kind of over-current protection circuit of controller of motor of automobile of the present invention; comprise the triggering holding circuit be connected with overcurrent judgment circuit triggering signal output, the reset circuit be connected with triggering holding circuit; the input of above-mentioned reset circuit is also connected with the reset signal output of motor main control chip, and the output of above-mentioned triggering holding circuit is also connected with power device driving chip.
As a further improvement on the present invention, above-mentioned reset circuit comprises resistance R9, resistance R10, electric capacity C5, electric capacity C6, diode D1, diode D2, resistance R11, resistance R12, wherein: resistance R9 is connected to the reset signal output of motor main control chip; After resistance R9 and electric capacity C5 connects, electric capacity C5 is connected to the positive pole of diode D2, and the negative pole of diode D2 is connected to the positive pole of diode D1, one end of resistance R11, one end of resistance R12, one end of electric capacity C6 simultaneously and triggers an input of holding circuit; The other end of resistance R11 and the negative pole of diode D1 are all connected on power supply VCC; The other end of resistance R12 is connected with the output triggering holding circuit; One end of electric capacity C6 connects the negative pole of diode D2, other end ground connection; Resistance R10 one end is connected between electric capacity C5 and diode D2, other end ground connection.
Further, above-mentioned triggering holding circuit comprises comparator U2B, comparator U2C, a comparator U2D and bleeder circuit, wherein: the reverse input end of the normal phase input end of comparator U2B, the inverting input of comparator U2C, comparator U2D is all connected with bleeder circuit; The normal phase input end of comparator U2D is connected with the negative pole of above-mentioned diode D2; The inverting input of comparator U2B is all connected with the output of comparator U2D with the normal phase input end of above-mentioned comparator U2C; The output of comparator U2C is connected with the other end of resistance R12; The output of comparator U2B is connected with power device driving chip; The output of comparator U2D is also by electric capacity C7 ground connection; Comparator U2B power end connects 12V power supply, earth terminal ground connection; Overcurrent judgment circuit triggering signal output is connected to the inverting input of above-mentioned comparator U2B and the normal phase input end of above-mentioned comparator U2C simultaneously.
Further, above-mentioned bleeder circuit is made up of electric capacity C8, resistance R13, resistance R14, and resistance R13 connects power supply VCC, resistance R14 ground connection, and resistance R13 connects with resistance R14, and electric capacity C8 is connected in parallel on resistance R14 two ends.
Further, above-mentioned triggering holding circuit also comprises electric capacity C9 and resistance R15; The power end of comparator U2B is also by electric capacity C9 ground connection; The output of comparator U2B also connects power supply VCC by resistance R15.
Operation principle of the present invention is: when overcurrent occurs; overcurrent judgment circuit triggering signal output output low level signal reports an error; power device driving chip receives error signal and shuts output; FLTn makes current foldback circuit export high level signal to driving chip and keep simultaneously; that is, the signal OE making current foldback circuit export to driving chip remains high level, makes drive singal shut output; guarantee that power device does not work, until main control chip exports RST signal make system reset.
Relative to prior art, tool of the present invention has the following advantages and beneficial effect:
1, fast response time of the present invention, can provide hardware overcurrent protection fast in time, ensures electric machine controller safe and highly efficient operation.
2, structure of the present invention is simple, cost is low.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
As shown in Figure 1; a kind of over-current protection circuit of controller of motor of automobile of the present embodiment; comprise the triggering holding circuit be connected with overcurrent judgment circuit triggering signal output, the reset circuit be connected with triggering holding circuit; the input of above-mentioned reset circuit is also connected with the reset signal output of motor main control chip, and the output of above-mentioned triggering holding circuit is also connected with power device driving chip.
Above-mentioned triggering holding circuit comprises comparator U2B, comparator U2C, a comparator U2D and bleeder circuit, wherein: the reverse input end of the normal phase input end of comparator U2B, the inverting input of comparator U2C, comparator U2D is all connected with bleeder circuit; The normal phase input end of comparator U2D is connected with the negative pole of diode D2; The inverting input of comparator U2B is all connected with the output of comparator U2D with the normal phase input end of comparator U2C; The output of comparator U2C is connected with the other end of resistance R12; The output of comparator U2B is connected with power device driving chip; The output of comparator U2D is also by electric capacity C7 ground connection; Comparator U2B power end connects 12V power supply, earth terminal ground connection; Overcurrent judgment circuit triggering signal output is connected to the inverting input of comparator U2B and the normal phase input end of comparator U2C simultaneously.When overcurrent occurs, overcurrent judgment circuit triggering signal output output low level signal reports an error, power device driving chip receives error signal and shuts output, FLTn makes comparator U2B export high level signal to driving chip and keep simultaneously, even if the signal OE that comparator U2B exports to driving chip remains high level, make drive singal shut output, guarantee that power device does not work, until main control chip exports RST signal make system reset.
Above-mentioned reset circuit comprises resistance R9, resistance R10, electric capacity C5, electric capacity C6, diode D1, diode D2, resistance R11, resistance R12, wherein: resistance R9 is connected to the reset signal output of motor main control chip; After resistance R9 and electric capacity C5 connects, electric capacity C5 is connected to the positive pole of diode D2, and the negative pole of diode D2 is connected to the positive pole of diode D1, one end of resistance R11, one end of resistance R12, one end of electric capacity C6 simultaneously and triggers an input of holding circuit; The other end of resistance R11 and the negative pole of diode D1 are all connected on power supply VCC; The other end of resistance R12 is connected with the output triggering holding circuit; One end of above-mentioned electric capacity C6 connects the negative pole of diode D2, other end ground connection; Resistance R10 one end is connected between electric capacity C5 and diode D2, other end ground connection.One end of resistance R12 connects the negative pole of diode D2, and the other end is connected with the output of comparator U2C.
Above-mentioned bleeder circuit is made up of electric capacity C8, resistance R13, resistance R14, and resistance R13 connects power supply VCC, resistance R14 ground connection, and resistance R13 connects with resistance R14, and electric capacity C8 is connected in parallel on resistance R14 two ends.
Above-mentioned triggering holding circuit also comprises electric capacity C9 and resistance R15; The power end of comparator U2B is also by electric capacity C9 ground connection; The output of comparator U2B also connects power supply VCC by resistance R15.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (4)
1. an over-current protection circuit of controller of motor of automobile, it is characterized in that, comprise the triggering holding circuit be connected with overcurrent judgment circuit triggering signal output, the reset circuit be connected with triggering holding circuit, the input of described reset circuit is also connected with the reset signal output of motor main control chip, and the output of described triggering holding circuit is also connected with power device driving chip;
Described reset circuit comprises resistance R9, resistance R10, electric capacity C5, electric capacity C6, diode D1, diode D2, resistance R11, resistance R12, wherein: resistance R9 is connected to the reset signal output of motor main control chip; After resistance R9 and electric capacity C5 connects, electric capacity C5 is connected to the positive pole of diode D2, and the negative pole of diode D2 is connected to the positive pole of diode D1, one end of resistance R11, one end of resistance R12, one end of electric capacity C6 simultaneously and triggers an input of holding circuit; The other end of described resistance R11 and the negative pole of diode D1 are all connected on power supply VCC; The other end of described resistance R12 is connected with the output triggering holding circuit; One end of described electric capacity C6 connects the negative pole of diode D2, other end ground connection; Described resistance R10 one end is connected between electric capacity C5 and diode D2, other end ground connection.
2. a kind of over-current protection circuit of controller of motor of automobile according to claim 1, it is characterized in that, described triggering holding circuit comprises comparator U2B, comparator U2C, a comparator U2D and bleeder circuit, wherein: the reverse input end of the normal phase input end of described comparator U2B, the inverting input of comparator U2C, comparator U2D is all connected with bleeder circuit; The normal phase input end of described comparator U2D is connected with the negative pole of described diode D2; The inverting input of described comparator U2B is all connected with the output of comparator U2D with the normal phase input end of described comparator U2C; The output of described comparator U2C is connected with the other end of resistance R12; The output of described comparator U2B is connected with power device driving chip; The output of described comparator U2D is also by electric capacity C7 ground connection; Described comparator U2B power end connects 12V power supply, earth terminal ground connection; Described overcurrent judgment circuit triggering signal output is connected to the inverting input of described comparator U2B and the normal phase input end of described comparator U2C simultaneously.
3. a kind of over-current protection circuit of controller of motor of automobile according to claim 2; it is characterized in that; described bleeder circuit is made up of electric capacity C8, resistance R13, resistance R14; resistance R13 connects power supply VCC, resistance R14 ground connection; resistance R13 connects with resistance R14, and electric capacity C8 is connected in parallel on resistance R14 two ends.
4. a kind of over-current protection circuit of controller of motor of automobile according to Claims 2 or 3, is characterized in that, described triggering holding circuit also comprises electric capacity C9 and resistance R15; The power end of described comparator U2B is also by electric capacity C9 ground connection; The output of described comparator U2B also connects power supply VCC by resistance R15.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310233074.5A CN103311902B (en) | 2013-06-13 | 2013-06-13 | Over-current protection circuit of controller of motor of automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310233074.5A CN103311902B (en) | 2013-06-13 | 2013-06-13 | Over-current protection circuit of controller of motor of automobile |
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| CN103311902A CN103311902A (en) | 2013-09-18 |
| CN103311902B true CN103311902B (en) | 2015-04-15 |
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| CN103795038B (en) * | 2014-01-27 | 2019-08-16 | 北汽福田汽车股份有限公司 | New-energy automobile inverter phase current over-current hardware protection system and method |
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|---|---|---|---|---|
| CN101478244A (en) * | 2009-01-12 | 2009-07-08 | 浙江大学 | Voltage falling generator for wind power electricity generation |
| CN202488389U (en) * | 2012-02-28 | 2012-10-10 | 咸宁学院 | Driving controller of brushless direct-current motor of electric automobile |
| CN102944730A (en) * | 2012-11-05 | 2013-02-27 | 深圳创维－Rgb电子有限公司 | Automatic detection device for voltage abnormal state |
| CN103066819A (en) * | 2012-12-03 | 2013-04-24 | 深圳市汇川技术股份有限公司 | Insulated gate bipolar transistor (IGBT) over-current protection circuit |
| CN203289070U (en) * | 2013-06-13 | 2013-11-13 | 成都联腾动力控制技术有限公司 | An overcurrent protection circuit |
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2013
- 2013-06-13 CN CN201310233074.5A patent/CN103311902B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478244A (en) * | 2009-01-12 | 2009-07-08 | 浙江大学 | Voltage falling generator for wind power electricity generation |
| CN202488389U (en) * | 2012-02-28 | 2012-10-10 | 咸宁学院 | Driving controller of brushless direct-current motor of electric automobile |
| CN102944730A (en) * | 2012-11-05 | 2013-02-27 | 深圳创维－Rgb电子有限公司 | Automatic detection device for voltage abnormal state |
| CN103066819A (en) * | 2012-12-03 | 2013-04-24 | 深圳市汇川技术股份有限公司 | Insulated gate bipolar transistor (IGBT) over-current protection circuit |
| CN203289070U (en) * | 2013-06-13 | 2013-11-13 | 成都联腾动力控制技术有限公司 | An overcurrent protection circuit |
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Effective date of registration: 20210927 Address after: 102600 Room 403, unit 1, 15th floor, changfengyuan, Huangcun Town, Daxing District, Beijing Patentee after: Du Lihong Address before: No.01, floor 1-5, building 1, no.3888, Yidu West Road, Longquanyi District, Chengdu, Sichuan 610000 Patentee before: CHENGDU LAINTEM MOTORS CONTROL TECHNOLOGY Co.,Ltd. |
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