CN103296642A - Short circuit protective circuit of direct current motor driver load - Google Patents
Short circuit protective circuit of direct current motor driver load Download PDFInfo
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- CN103296642A CN103296642A CN2013102343603A CN201310234360A CN103296642A CN 103296642 A CN103296642 A CN 103296642A CN 2013102343603 A CN2013102343603 A CN 2013102343603A CN 201310234360 A CN201310234360 A CN 201310234360A CN 103296642 A CN103296642 A CN 103296642A
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- resistance
- comparator
- motor driver
- protective circuit
- direct current
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Abstract
The invention discloses a short circuit protective circuit of a direct current motor driver load. The short circuit protective circuit of the direct current motor driver load comprises a comparator, a microprocessor and a first resistor; one side of the first resistor is a current input sampling side which is connected with a sampling resistor and a load which are arranged on the external; the other side of the first resistor is connected with a normal phase input terminal of the comparator; and an output terminal of the comparator is connected with an MCU (Micro Controller Unit) of the microprocessor. According to the short circuit protective circuit of the direct current motor driver load, when IGBT of a driving motor is far from the breakdown time at a moment that the direct current motor is short-circuited and the IGBT driving is directly switched off through combination of softwares and hardwares, so that a controller is protected.
Description
Technical field
The present invention relates to a kind of protecting circuit for electrical equipment, relate in particular to a kind of dc motor driver load short circuits protective circuit.
Background technology
Short-circuit protection is one of protection of most critical in all kinds of circuit; when short trouble appears in Circuits System; can short-circuit protection circuit start protection fast in time; after short trouble is got rid of; can system automatically terminate guard mode, is evaluation system reliability, fail safe and intelligent key factor.
In addition, in case the direct current treadmill of Shi Yonging can not turn-off output control immediately when the d.c. motor short circuit in the market, cause the overheated burning of component wear and short-circuit component easily, must cause controller to damage, bring potential safety hazard.
Summary of the invention
Main purpose of the present invention is to provide a kind of dc motor driver load short circuits protective circuit; it is at the direct current machine transcient short circuit time; when the IGBT of its drive motors does not reach damage during the time, drive in conjunction with directly turn-offing IGBT by software and hardware, thereby controller is protected.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of dc motor driver load short circuits protective circuit comprises comparator, microprocessor and first resistance; First resistance, one side is electric current input sample side, connects outside sampling resistor and load, and the opposite side of first resistance is connected with the normal phase input end of comparator, and the output of comparator is connected to microprocessor MCU.
Preferably, second resistance in parallel and a filter capacitor between the negative-phase input of comparator and the ground, second resistance, one side also is connected with the 3rd resistance.
Preferably, comparator adopts the LM393 chip.
Preferably, first resistance is 1k ohm, and second resistance is 1k ohm, and the 3rd resistance is 12k ohm.
The invention has the beneficial effects as follows: protective circuit of the present invention; when load produces short circuit; the electric current of load can raise moment; at this moment; both end voltage moment of sampling resistor raises, and amplifier and reference voltage by comparator inside compare comparator output high level; microprocessor is namely reported the short circuit current guard signal, turn-offs IGBT and drives.
Description of drawings
Fig. 1 is embodiment of the invention circuit theory diagrams.
Embodiment
The realization of the object of the invention, functional characteristics and beneficial effect are described further below in conjunction with specific embodiment and accompanying drawing.
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, embodiment of the invention dc motor driver load short circuits protective circuit comprises comparator IC8A, microprocessor MCU and a plurality of resistance; First resistance R, 1 one sides are electric current input sample sides, connect outside sampling resistor and load, and the opposite side of first resistance R 1 is connected with the normal phase input end of comparator IC8A, and the output of comparator IC8A is connected to microprocessor MCU.
Second resistance R 2 in parallel and a filter capacitor C1 between the negative-phase input of described comparator IC8A and the ground, second resistance R, 2 one sides also are connected with the 3rd resistance R 3.
Described comparator IC8A adopts the LM393 chip.
First resistance R, 1 resistance that described filtering is used is 1k ohm, and second resistance R, 2 resistances are 1k ohm, and the 3rd resistance R 3 resistances are 12k ohm.Second resistance, the 3rd resistance are the adjustment resistance of comparator IC8A.
Described comparator IC8A compares for voltage and the reference voltage at the sampling resistor two ends that will be connected in series load; the comparator of output short circuit protection signal when load generation short circuit current, its normal phase input end is by connecting described sampling resistor and described load after 1 filtering of first resistance R.
When load produced short circuit, the electric current of load can raise moment, at this moment; both end voltage moment of sampling resistor raises, and amplifier and reference voltage by comparator IC8A inside compare comparator output high level; microprocessor is namely reported the short circuit current guard signal, turn-offs IGBT and drives.
Under the holding state, when IGBT short circuit do not occur, the signal that is input to microprocessor MCU was low level; in case being input to the signal of MCU is high level; then MCU judges has IGBT short circuit to occur, and MCU turn-offs IGBT by corresponding control signal and drives, thereby protective circuit is not damaged.
Claims (4)
1. a dc motor driver load short circuits protective circuit is characterized in that: comprise comparator, microprocessor and first resistance; First resistance, one side is electric current input sample side, connects outside sampling resistor and load, and the opposite side of first resistance is connected with the normal phase input end of comparator, and the output of comparator is connected to microprocessor MCU.
2. dc motor driver load short circuits protective circuit according to claim 1 is characterized in that: second resistance in parallel and a filter capacitor between the negative-phase input of described comparator and the ground, second resistance, one side also is connected with the 3rd resistance.
3. dc motor driver load short circuits protective circuit according to claim 1 and 2 is characterized in that: comparator employing LM393 chip.
4. dc motor driver load short circuits protective circuit according to claim 2, it is characterized in that: first resistance is 1k ohm, and second resistance is 1k ohm, and the 3rd resistance is 12k ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102343603A CN103296642A (en) | 2013-06-14 | 2013-06-14 | Short circuit protective circuit of direct current motor driver load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102343603A CN103296642A (en) | 2013-06-14 | 2013-06-14 | Short circuit protective circuit of direct current motor driver load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103296642A true CN103296642A (en) | 2013-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102343603A Pending CN103296642A (en) | 2013-06-14 | 2013-06-14 | Short circuit protective circuit of direct current motor driver load |
Country Status (1)
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| CN (1) | CN103296642A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016037335A1 (en) * | 2014-09-11 | 2016-03-17 | Abb Technology Ltd | Protective circuit |
| CN109149525A (en) * | 2018-11-05 | 2019-01-04 | 浙江禾川科技股份有限公司 | A kind of shorted to earth protective device and inverter system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202268683U (en) * | 2011-10-09 | 2012-06-06 | 无锡艾柯威科技有限公司 | Motor overcurrent protection circuit |
| CN202337863U (en) * | 2011-11-30 | 2012-07-18 | 北京中纺精业机电设备有限公司 | Device for preventing and warning output short circuit of electronic weft selector |
| CN203339678U (en) * | 2013-06-14 | 2013-12-11 | 浙江海振电子科技有限公司 | A DC motor driver load short-circuit protection circuit |
-
2013
- 2013-06-14 CN CN2013102343603A patent/CN103296642A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202268683U (en) * | 2011-10-09 | 2012-06-06 | 无锡艾柯威科技有限公司 | Motor overcurrent protection circuit |
| CN202337863U (en) * | 2011-11-30 | 2012-07-18 | 北京中纺精业机电设备有限公司 | Device for preventing and warning output short circuit of electronic weft selector |
| CN203339678U (en) * | 2013-06-14 | 2013-12-11 | 浙江海振电子科技有限公司 | A DC motor driver load short-circuit protection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016037335A1 (en) * | 2014-09-11 | 2016-03-17 | Abb Technology Ltd | Protective circuit |
| US10256805B2 (en) | 2014-09-11 | 2019-04-09 | Abb Schweiz Ag | Protective circuit with current regulating digital output module |
| CN109149525A (en) * | 2018-11-05 | 2019-01-04 | 浙江禾川科技股份有限公司 | A kind of shorted to earth protective device and inverter system |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130911 |