CN203289070U - An overcurrent protection circuit - Google Patents
An overcurrent protection circuit Download PDFInfo
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- CN203289070U CN203289070U CN2013203375255U CN201320337525U CN203289070U CN 203289070 U CN203289070 U CN 203289070U CN 2013203375255 U CN2013203375255 U CN 2013203375255U CN 201320337525 U CN201320337525 U CN 201320337525U CN 203289070 U CN203289070 U CN 203289070U
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Abstract
The utility model discloses an overcurrent protection circuit comprising a trigger holding circuit and a reset circuit. The trigger holding circuit is connected with the trigger signal output end of an overcurrent determining circuit. The reset circuit is connected with the trigger holding circuit. The input end of the reset circuit is also connected with the reset signal output end of a motor master control chip. The output end of the trigger holding circuit is also connected with a power device driving chip. The overcurrent protection circuit has advantages of fast response speed and low cost and is capable of providing protection for a power device.
Description
Technical field
The utility model relates to circuit field, relates in particular to a kind of 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 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.
The utility model content
The technical problems to be solved in the utility model just is: for the problems referred to above of prior art existence; the utility model provides the current foldback circuit that a kind of response time is short, cost is low, versatility is good; the utility model can be the electric machine controller power device hardware overcurrent protection fast is provided; but free setting electric machine controller overcurrent protection current value, guarantee the electric machine controller safe and highly efficient operation.
For achieving the above object; a kind of current foldback circuit of the present utility model; comprise the triggering holding circuit that is connected with overcurrent decision circuitry triggering signal output, the reset circuit that is connected with the triggering holding circuit; the input of above-mentioned reset circuit also is connected 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 is connected.
As further improvement of the utility model, 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 power supply VCC; The other end of resistance R 12 is connected 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 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 are connected with bleeder circuit; The normal phase input end of comparator U2D is connected 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 is connected with the output of comparator U2D; The output of comparator U2C is connected with resistance R 12; The output of comparator U2B drives chip with power device and is connected; 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 consists 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 utility model 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 utlity model has following advantage and beneficial effect:
1, the utility model fast response time, can in time provide hardware overcurrent protection fast, guarantees the electric machine controller safe and highly efficient operation.
2, the utility model is simple in structure, cost is low.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited only to this.
As shown in Figure 1; a kind of current foldback circuit of the present embodiment; comprise the triggering holding circuit that is connected with overcurrent decision circuitry triggering signal output, the reset circuit that is connected with the triggering holding circuit; the input of above-mentioned reset circuit also is connected 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 is connected.
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 are connected with bleeder circuit; The normal phase input end of comparator U2D is connected with the negative pole of diode D2; The normal phase input end of the inverting input of comparator U2B and comparator U2C all is connected with the output of comparator U2D; The output of comparator U2C is connected with resistance R 12; The output of comparator U2B drives chip with power device and is connected; 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 power supply VCC; The other end of resistance R 12 is connected 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 diode D2, other end ground connection.
Above-mentioned bleeder circuit consists 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.
Be only below preferred implementation of the present utility model, protection range of the present utility model also not only is confined to above-described embodiment, and all technical schemes that belongs under the utility model thinking all belong to protection range of the present utility model.Should be pointed out that for those skilled in the art, the some improvements and modifications not breaking away under the utility model principle prerequisite, should be considered as protection range of the present utility model.
Claims (5)
1. current foldback circuit; it is characterized in that; comprise the triggering holding circuit that is connected with overcurrent decision circuitry triggering signal output, the reset circuit that is connected with the triggering holding circuit; the input of described reset circuit also is connected 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 is connected.
2. a kind of 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 power supply VCC; The other end of described resistance R 12 is connected 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 diode D2, other end ground connection.
3. a kind of 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 are connected with bleeder circuit; The normal phase input end of described comparator U2D is connected 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 is connected with the output of comparator U2D; The output of described comparator U2C is connected with resistance R 12; The output of described comparator U2B drives chip with power device and is connected; 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 current foldback circuit according to claim 3; it is characterized in that, described bleeder circuit consists of capacitor C 8, resistance R 13, resistance R 14, and 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 current foldback circuits, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203375255U CN203289070U (en) | 2013-06-13 | 2013-06-13 | An overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203375255U CN203289070U (en) | 2013-06-13 | 2013-06-13 | An overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203289070U true CN203289070U (en) | 2013-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203375255U Withdrawn - After Issue CN203289070U (en) | 2013-06-13 | 2013-06-13 | An overcurrent protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203289070U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311902A (en) * | 2013-06-13 | 2013-09-18 | 成都联腾动力控制技术有限公司 | Over-current protection circuit of controller of motor of automobile |
-
2013
- 2013-06-13 CN CN2013203375255U patent/CN203289070U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311902A (en) * | 2013-06-13 | 2013-09-18 | 成都联腾动力控制技术有限公司 | Over-current protection circuit of controller of motor of automobile |
| CN103311902B (en) * | 2013-06-13 | 2015-04-15 | 成都联腾动力控制技术有限公司 | Over-current protection circuit of controller of motor of automobile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20150415 |
|
| RGAV | Abandon patent right to avoid regrant |