CN202649294U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN202649294U CN202649294U CN 201220229545 CN201220229545U CN202649294U CN 202649294 U CN202649294 U CN 202649294U CN 201220229545 CN201220229545 CN 201220229545 CN 201220229545 U CN201220229545 U CN 201220229545U CN 202649294 U CN202649294 U CN 202649294U
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 4
- 238000013024 troubleshooting Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model provides a current detection circuit, aiming for monitoring the output current of an automobile low-voltage power supply to prevent overcurrent of a current from burning out components. The current detection circuit comprises a current detection unit which can convert the detected current into the voltage difference output, wherein the current detection unit is provided with a first output end and a second output end so as to output the voltage difference; the key point is that the first output end of the current detection unit is connected with the first input end of an amplifier through a first resistor ; the second output end is connected with a second input end of the amplifier through the second resistor; the contact of the first input end of the amplifier and the first resistance is connected with the output end of the amplifier through a third resistance; and the contact of the second input end of the amplifier and the second resistor is grounded through a fourth resistor. The current detection circuit has the advantages of being accurate in detection, being simple in structure, having few components, being lower in cost, and having high practicability.
Description
Technical field
The utility model belongs to technical field of automotive electronics, specially refers to a kind of current detection circuit.
Background technology
At present, along with the development of new-energy automobile industry, the application of vehicle power is more and more extensive, and its status and importance highlight day by day, and then also there is more and stricter requirement itself performance, reliability, cost and security aspect of vehicle power.Be the working condition of monitoring power supply, just must monitor its electric current, burn out parts to prevent overcurrent.
Summary of the invention
The purpose of this utility model is to propose a kind of current detection circuit, so that the output current of automobile low-tension supply is monitored, burns out parts to prevent overcurrent.
Current detection circuit of the present utility model comprises the current detecting unit that the electric current that detects can be converted into voltage difference output, described current detecting unit has the first output terminal and the second output terminal is poor with output voltage, key is that the first output terminal of described current detecting unit links to each other with the first input end of an amplifier by the first resistance, and described the second output terminal links to each other with the second input end of described amplifier by the second resistance; The first input end of described amplifier links to each other with the output terminal of described amplifier by the 3rd resistance with the contact of the first resistance, and the second input end of described amplifier and the contact of the second resistance are by the 4th resistance eutral grounding.
Current detecting unit is converted to voltage differential signal with the current signal that gathers, be input to amplifier, thereby the precise and stable magnitude of voltage after obtaining amplifying, the current value of this magnitude of voltage and collection has one-to-one relationship, therefore the output end voltage by measuring amplifier namely can obtain accurate current value, can obtain by the size of regulating the 3rd resistance suitable enlargement factor.
Further; for realizing the overcurrent defencive function; the output terminal of described amplifier is by a series circuit ground connection that is in series by the 5th resistance and the 6th resistance; the contact of described the 5th resistance and the 6th resistance links to each other with the first input end of a comparer; the second input end of described comparer links to each other with a canonical reference voltage, and the output terminal of described comparer links to each other with the control end of an overcurrent protected location.
By setting the parameter of five resistance and the 6th resistance, the output end voltage of amplifier can be converted into a comparative voltage, then utilize comparer that this comparative voltage is compared with reference voltage.With the normal phase input end of reference voltage connection comparer, the inverting input that comparative voltage connects comparer is example, and the numerical values recited of reference voltage is not when over current fault occurs, greater than comparing voltage value, when over current fault occurs, less than comparing voltage value.When over current fault does not occur; comparer output high level is to the overcurrent protected location; when the overcurrent fault occurs; the comparer output low level is to the overcurrent protected location, and the overcurrent protected location is controlled the startup of defencive function according to this level conversion, after the overcurrent trouble shooting; comparing voltage value is reduced to less than reference voltage level; comparer output returns to normal level state, and the overcurrent protected location is de-preservation according to this, and power module restarts normal operation.Above-mentioned protection philosophy is the low level protection, can certainly be by be connected to the comparer inverting input with reference to voltage, and comparative voltage is input to the comparer normal phase input end, realizes the high level protection, repeats no more herein.
Specifically, described current detecting unit is precision resistance, and the precision of described precision resistance is 0.01%.
Current detection circuit of the present utility model can Real-Time Monitoring and feedback current state; can also when occuring, overcurrent react rapidly; power supply itself and related device are protected; and can after trouble shooting, can automatically restore to duty; detect accurate, simple in structure, components and parts are few, cost is low, have good practicality.
Description of drawings
Fig. 1 is the schematic diagram of current detection circuit of the present utility model.
Embodiment
The below contrasts accompanying drawing, by the description to embodiment, the effect of the mutual alignment between the shape of embodiment of the present utility model such as related each member, structure, the each several part and annexation, each several part and principle of work etc. are described in further detail.
Embodiment 1;
As shown in Figure 1, the current detection circuit of present embodiment comprises the current detecting unit 1 that the electric current that detects can be converted into voltage difference output, current detecting unit 1 has the first output terminal 11 and the second output terminal 12 is poor with output voltage, the first output terminal 11 of current detecting unit 1 links to each other with the first input end 21 of an amplifier 2 by the first resistance R 1, and the second output terminal 12 links to each other with the second input end 22 of amplifier 2 by the second resistance R 2; The first input end 21 of amplifier 2 links to each other with the output terminal 23 of amplifier 2 by the 3rd resistance R 3 with the contact of the first resistance R 1, and the second input end 22 of amplifier 2 and the contact of the second resistance R 2 are by the 4th resistance R 4 ground connection; The output terminal 23 of amplifier 2 is by a series circuit ground connection that is in series by the 5th resistance R 5 and the 6th resistance R 6; the contact of the 5th resistance R 5 and the 6th resistance R 6 links to each other with the normal phase input end 31 of a comparer 3; the negative-phase input 32 of comparer 3 links to each other with a canonical reference voltage, and the output terminal 33 of comparer 3 links to each other with the control end of an overcurrent protected location 4.
Current detecting unit 1 can utilize precision resistance to realize, precision resistance is serially connected in the power circuit to be detected, and the two ends of precision resistance are linked to each other and get final product with the first resistance R 1, the second resistance R 2 respectively.
Current detecting unit 1 is converted to voltage differential signal with the current signal that gathers, be input to amplifier 2, thereby the precise and stable magnitude of voltage after obtaining amplifying, the current value of this magnitude of voltage and collection has one-to-one relationship, therefore the voltage of the output terminal 23 by measuring amplifier 2 namely can obtain accurate current value, can obtain by the size of regulating the 3rd resistance R 3 suitable enlargement factor.
When over current fault does not occur; comparer 3 output high level are to overcurrent protected location 4; when the overcurrent fault occurs; comparer 3 output low levels are to overcurrent protected location 4, and overcurrent protected location 4 is controlled the startup of defencive function according to this level conversion, after the overcurrent trouble shooting; comparing voltage value is reduced to less than reference voltage level; comparer 3 outputs return to normal level state, and overcurrent protected location 4 is de-preservation according to this, and power module restarts normal operation.
Claims (4)
1. current detection circuit, comprise the current detecting unit that the electric current that detects can be converted into voltage difference output, described current detecting unit has the first output terminal and the second output terminal is poor with output voltage, the first output terminal that it is characterized in that described current detecting unit links to each other with the first input end of an amplifier by the first resistance, and described the second output terminal links to each other with the second input end of described amplifier by the second resistance; The first input end of described amplifier links to each other with the output terminal of described amplifier by the 3rd resistance with the contact of the first resistance, and the second input end of described amplifier and the contact of the second resistance are by the 4th resistance eutral grounding.
2. current detection circuit according to claim 1; it is characterized in that the output terminal of described amplifier is by a series circuit ground connection that is in series by the 5th resistance and the 6th resistance; the contact of described the 5th resistance and the 6th resistance links to each other with the first input end of a comparer; the second input end of described comparer links to each other with a canonical reference voltage, and the output terminal of described comparer links to each other with the control end of an overcurrent protected location.
3. current detection circuit according to claim 1 and 2 is characterized in that described current detecting unit is precision resistance.
4. current detection circuit according to claim 3, the precision that it is characterized in that described precision resistance is 0.01%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229545 CN202649294U (en) | 2012-05-22 | 2012-05-22 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229545 CN202649294U (en) | 2012-05-22 | 2012-05-22 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202649294U true CN202649294U (en) | 2013-01-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220229545 Expired - Lifetime CN202649294U (en) | 2012-05-22 | 2012-05-22 | Current detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202649294U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389401A (en) * | 2013-07-15 | 2013-11-13 | 汕头市超声仪器研究所有限公司 | Power grid voltage detection device |
| CN104374983A (en) * | 2014-10-29 | 2015-02-25 | 中国电子科技集团公司第三十六研究所 | Current monitoring circuit |
| CN106226585A (en) * | 2016-07-05 | 2016-12-14 | 广东威创视讯科技股份有限公司 | Voltage monitor and electronic equipment monitoring device |
| CN111562429A (en) * | 2020-05-29 | 2020-08-21 | 广东浪潮大数据研究有限公司 | Current detection circuit and system of power supply |
-
2012
- 2012-05-22 CN CN 201220229545 patent/CN202649294U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389401A (en) * | 2013-07-15 | 2013-11-13 | 汕头市超声仪器研究所有限公司 | Power grid voltage detection device |
| CN103389401B (en) * | 2013-07-15 | 2015-11-25 | 汕头市超声仪器研究所有限公司 | A kind of electric network voltage detection device |
| CN104374983A (en) * | 2014-10-29 | 2015-02-25 | 中国电子科技集团公司第三十六研究所 | Current monitoring circuit |
| CN106226585A (en) * | 2016-07-05 | 2016-12-14 | 广东威创视讯科技股份有限公司 | Voltage monitor and electronic equipment monitoring device |
| CN111562429A (en) * | 2020-05-29 | 2020-08-21 | 广东浪潮大数据研究有限公司 | Current detection circuit and system of power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SAIC CHERY AUTOMOBILE CO., LTD. Effective date: 20150716 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150716 Address after: 241000 Yijiang, Anhui Province, Jin Hua Road, No. 226, South Road, No. Patentee after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. |
|
| CP03 | Change of name, title or address |
Address after: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Patentee after: Chery New Energy Automobile Co.,Ltd. Address before: 241000 No. 226 Hua Jin South Road, Yijiang District, Anhui, Wuhu Patentee before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130102 |
|
| CX01 | Expiry of patent term |