CN103311902A - 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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- CN103311902A CN103311902A CN2013102330745A CN201310233074A CN103311902A CN 103311902 A CN103311902 A CN 103311902A CN 2013102330745 A CN2013102330745 A CN 2013102330745A CN 201310233074 A CN201310233074 A CN 201310233074A CN 103311902 A CN103311902 A CN 103311902A
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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, relate in particular to a kind of automotive motor controller current foldback circuit.
Background technology
New-energy automobile is MOSFET or IGBT constant power device with the core devices of electric machine controller, and its development trend is large electric current, high-power.The modal damage type of power device is that overcurrent damages, and therefore the output current of electric machine controller is measured accurately and is carried out reliable overcurrent protection for guaranteeing that the electric machine controller trouble free service is particularly important on the basis of Measurement accuracy.
Rely at present high-precision current sensor can measure accurately the electric current of controller, but present overcurrent protection form commonly used is for relying on software detection to carry out overcurrent protection or relying on the supersaturation detection of integrated drive chips to carry out simple overcurrent protection.
The reaction speed of carrying out overcurrent protection after the software detection is slower; can not in time measure the generation of power device overcurrent; turn-off again output signal after detecting and also need the long period; and power device is very short from spending the time that flows to damage, so software protection can not provide overcurrent protection for power device well.The supersaturation of integrated drive chips detects and can fast detecting turn-off fast, but can't set the overcurrent protection value, and can not provide overcurrent protection to power device well when lasting large electric current does not produce supersaturation.
Summary of the invention
The technical problem to be solved in the present invention just is: for the problems referred to above of prior art existence; 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 the electric machine controller power device fast hardware overcurrent protection is provided; but free setting electric machine controller overcurrent protection current value guarantees the electric machine controller safe and highly efficient operation.
For achieving the above object; a kind of automotive motor controller current foldback circuit of the present invention; comprise the triggering holding circuit that links to each other with overcurrent decision circuitry triggering signal output, the reset circuit that links to each other with the triggering holding circuit; the input of above-mentioned reset circuit also links to each other with the reset signal output of motor main control chip, and the output of above-mentioned triggering holding circuit also drives chip with power device and links to each other.
As a further improvement on the present invention, above-mentioned reset circuit comprises resistance R 9, resistance R 10, capacitor C 5, capacitor C 6, diode D1, diode D2, resistance R 11, resistance R 12, and wherein: resistance R 9 is connected to the reset signal output of motor main control chip; After resistance R 9 and capacitor C 5 series connection, capacitor C 5 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, an end of resistance R 11, an end of resistance R 12, an end of capacitor C 3 and an input that triggers holding circuit simultaneously; The negative pole of the other end of resistance R 11 and diode D1 all is connected on the power supply VCC; The other end of resistance R 12 links to each other with an output that triggers holding circuit; The other end ground connection of capacitor C 6; Resistance R 10 1 ends are connected between capacitor C 5 and the diode D2, other end ground connection.
Further, above-mentioned triggering holding circuit comprises comparator U2B, comparator U2C, comparator U2D and a bleeder circuit, and wherein: the inverting input of the normal phase input end of comparator U2B, comparator U2C, the reverse input end of comparator U2D all link to each other with bleeder circuit; The normal phase input end of comparator U2D links to each other with the negative pole of above-mentioned diode D2; The normal phase input end of the inverting input of comparator U2B and above-mentioned comparator U2C all links to each other with the output of comparator U2D; The output of comparator U2C links to each other with resistance R 12; The output of comparator U2B drives chip with power device and links to each other; The output of comparator U2D is also by capacitor C 7 ground connection; Comparator U2B power end connects 12V power supply, earth terminal ground connection; Overcurrent decision circuitry 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 of capacitor C 8, resistance R 13, resistance R 14, and resistance R 13 connects power supply VCC, resistance R 14 ground connection, and resistance R 13 is connected with resistance R 14, and capacitor C 8 is connected in parallel on resistance R 14 two ends.
Further, above-mentioned triggering holding circuit also comprises capacitor C 9 and resistance R 15; The power end of comparator U2B is also by capacitor C 9 ground connection; The output of comparator U2B also connects power supply VCC by resistance R 15.
Operation principle of the present invention is: when overcurrent occurs; overcurrent decision circuitry triggering signal output output low level signal reports an error; power device drives chip and receives that the signal that reports an error shuts output; FLTn makes current foldback circuit to driving chip output high level signal and keeping simultaneously; that is, make current foldback circuit remain high level to the signal OE that drives chip output, make the driving signal shut output; guarantee that power device do not work, until main control chip output RST signal makes system reset.
With respect to prior art, the present invention has following advantage and beneficial effect:
1, fast response time of the present invention can in time provide fast hardware overcurrent protection, guarantees the electric machine controller safe and highly efficient operation.
2, the present invention is simple in structure, cost is low.
Description of drawings
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 automotive motor controller current foldback circuit of the present embodiment; comprise the triggering holding circuit that links to each other with overcurrent decision circuitry triggering signal output, the reset circuit that links to each other with the triggering holding circuit; the input of above-mentioned reset circuit also links to each other with the reset signal output of motor main control chip, and the output of above-mentioned triggering holding circuit also drives chip with power device and links to each other.
Above-mentioned triggering holding circuit comprises comparator U2B, comparator U2C, comparator U2D and a bleeder circuit, and wherein: the inverting input of the normal phase input end of comparator U2B, comparator U2C, the reverse input end of comparator U2D all link to each other with bleeder circuit; The normal phase input end of comparator U2D links to each other with the negative pole of diode D2; The normal phase input end of the inverting input of comparator U2B and comparator U2C all links to each other with the output of comparator U2D; The output of comparator U2C links to each other with resistance R 12; The output of comparator U2B drives chip with power device and links to each other; The output of comparator U2D is also by capacitor C 7 ground connection; Comparator U2B power end connects 12V power supply, earth terminal ground connection; Overcurrent decision circuitry 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 decision circuitry triggering signal output output low level signal reports an error, power device drives chip and receives that the signal that reports an error shuts output, FLTn makes comparator U2B to driving chip output high level signal and keeping simultaneously, even comparator U2B remains high level to the signal OE that drives chip output, make to drive signal and shut output, guarantee that power device do not work, until main control chip output RST signal makes system reset.
Above-mentioned reset circuit comprises resistance R 9, resistance R 10, capacitor C 5, capacitor C 6, diode D1, diode D2, resistance R 11, resistance R 12, and wherein: resistance R 9 is connected to the reset signal output of motor main control chip; After resistance R 9 and capacitor C 5 series connection, capacitor C 5 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, an end of resistance R 11, an end of resistance R 12, an end of capacitor C 3 and an input that triggers holding circuit simultaneously; The negative pole of the other end of resistance R 11 and diode D1 all is connected on the power supply VCC; The other end of resistance R 12 links to each other with an output that triggers holding circuit; The other end ground connection of above-mentioned capacitor C 6; Resistance R 10 1 ends are connected between capacitor C 5 and the diode D2, other end ground connection.
Above-mentioned bleeder circuit is made of capacitor C 8, resistance R 13, resistance R 14, and resistance R 13 connects power supply VCC, resistance R 14 ground connection, and resistance R 13 is connected with resistance R 14, and capacitor C 8 is connected in parallel on resistance R 14 two ends.
Above-mentioned triggering holding circuit also comprises capacitor C 9 and resistance R 15; The power end of comparator U2B is also by capacitor C 9 ground connection; The output of comparator U2B also connects power supply VCC by resistance R 15.
Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art, the some improvements and modifications not breaking away under the principle of the invention prerequisite should be considered as protection scope of the present invention.
Claims (5)
1. automotive motor controller current foldback circuit; it is characterized in that; comprise the triggering holding circuit that links to each other with overcurrent decision circuitry triggering signal output, the reset circuit that links to each other with the triggering holding circuit; the input of described reset circuit also links to each other with the reset signal output of motor main control chip, and the output of described triggering holding circuit also drives chip with power device and links to each other.
2. a kind of automotive motor controller current foldback circuit according to claim 1, it is characterized in that, described reset circuit comprises resistance R 9, resistance R 10, capacitor C 5, capacitor C 6, diode D1, diode D2, resistance R 11, resistance R 12, and wherein: resistance R 9 is connected to the reset signal output of motor main control chip; After resistance R 9 and capacitor C 5 series connection, capacitor C 5 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, an end of resistance R 11, an end of resistance R 12, an end of capacitor C 3 and an input that triggers holding circuit simultaneously; The negative pole of the other end of described resistance R 11 and diode D1 all is connected on the power supply VCC; The other end of described resistance R 12 links to each other with an output that triggers holding circuit; The other end ground connection of described capacitor C 6; Described resistance R 10 1 ends are connected between capacitor C 5 and the diode D2, other end ground connection.
3. a kind of automotive motor controller current foldback circuit according to claim 2, it is characterized in that, described triggering holding circuit comprises comparator U2B, comparator U2C, comparator U2D and a bleeder circuit, and wherein: the inverting input of the normal phase input end of described comparator U2B, comparator U2C, the reverse input end of comparator U2D all link to each other with bleeder circuit; The normal phase input end of described comparator U2D links to each other with the negative pole of described diode D2; The normal phase input end of the inverting input of described comparator U2B and described comparator U2C all links to each other with the output of comparator U2D; The output of described comparator U2C links to each other with resistance R 12; The output of described comparator U2B drives chip with power device and links to each other; The output of described comparator U2D is also by capacitor C 7 ground connection; Described comparator U2B power end connects 12V power supply, earth terminal ground connection; Described overcurrent decision circuitry triggering signal output is connected to the inverting input of described comparator U2B and the normal phase input end of described comparator U2C simultaneously.
4. a kind of automotive motor controller current foldback circuit according to claim 3; it is characterized in that; described bleeder circuit is made of capacitor C 8, resistance R 13, resistance R 14; resistance R 13 connects power supply VCC, resistance R 14 ground connection; resistance R 13 is connected with resistance R 14, and capacitor C 8 is connected in parallel on resistance R 14 two ends.
5. according to claim 3 or 4 described a kind of automotive motor controller current foldback circuits, it is characterized in that, described triggering holding circuit also comprises capacitor C 9 and resistance R 15; The power end of described comparator U2B is also by capacitor C 9 ground connection; The output of described comparator U2B also connects power supply VCC by resistance R 15.
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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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| 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 true CN103311902A (en) | 2013-09-18 |
| CN103311902B CN103311902B (en) | 2015-04-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795038A (en) * | 2014-01-27 | 2014-05-14 | 北京智行鸿远汽车技术有限公司 | Inverter phase current over-current hardware protection system and method for new energy automobile |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103795038A (en) * | 2014-01-27 | 2014-05-14 | 北京智行鸿远汽车技术有限公司 | Inverter phase current over-current hardware protection system and method for new energy automobile |
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| CN103311902B (en) | 2015-04-15 |
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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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