CN204241613U - A kind of load open-circuit detection circuit - Google Patents
A kind of load open-circuit detection circuit Download PDFInfo
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- CN204241613U CN204241613U CN201420808718.9U CN201420808718U CN204241613U CN 204241613 U CN204241613 U CN 204241613U CN 201420808718 U CN201420808718 U CN 201420808718U CN 204241613 U CN204241613 U CN 204241613U
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- mos pipe
- load open
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- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model discloses a kind of load open-circuit detection circuit, comprise flash drive circuit module, also comprise the detection opening switch circuit module be connected with flash drive circuit module, and the load open-circuit detection circuit module detected for load open circuit be connected with detection opening switch circuit module.The utility model is very low for the leakage current detecting load open circuit, and can regulate detection threshold according to the situation of load, and when not detecting, open detection circuit is closed, and does not have electric current to introduce.
Description
Technical field
The utility model relates to a kind of load open-circuit detection circuit.
Background technology
Have flash to drive the lower function detecting load open circuit in off position at present on the market, often this kind of flash drives the judgment threshold of the lower load open circuit detected in off position unadjustable, and it is comparatively large to detect electric current, is greater than 120uA.If load is LED, flash drive in off position detect open circuit time, the electric current of 120uA may cause the situation of LED glimmer to occur, and detection electric current do less, often cost is higher.
Summary of the invention
In order to solve the problem, the utility model provides a kind of design proposal of load open-circuit detection circuit.
A kind of load open-circuit detection circuit, comprise flash drive circuit module, also comprise the detection opening switch circuit module be connected with flash drive circuit module, and the load open-circuit detection circuit module detected for load open circuit be connected with detection opening switch circuit module.
Concrete, the flash power output end that described flash drive circuit module comprises an output control pin, a flash driver element and is connected with flash driver element; Described output control pin connects flash driver element and is used for the unlatching of given control signal control flash driver element.
Concrete, described detection opening switch circuit module comprises a triode Q2, a P-MOS pipe Q1, and by resistance R4 be connected with the base stage of described triode Q2 for controlling to detect the switch control rule pin that opening switch is opened; The collector of described triode Q2 is connected with the grid of P-MOS pipe Q1 by resistance R2, and the drain electrode of described P-MOS pipe Q1 is connected with resistance R11 with divider resistance R3 respectively, and the source electrode of described P-MOS pipe Q1 is connected with+5V leakage current test power supply.
Concrete, described load open-circuit detection circuit module comprises a comparer U1, a N-MOS pipe Q3, and feeds back pin by the load open circuit that resistance R10 is connected with the drain electrode of described N-MOS pipe Q3; The output terminal of described comparer U1 is connected with the grid of described N-MOS pipe Q3, the negative input of described comparer U1 is connected with described flash power output end by resistance R6 and diode D1, the positive input of described comparer U1 passes through the+5V detection of electrical leakage power supply dividing potential drop of resistance R7 and resistance R8, the source ground of described N-MOS pipe Q3, the drain electrode of described N-MOS pipe Q3 is connected with+5V leakage current test power supply by R9.
In sum, the utility model has following beneficial effect: the leakage current for detecting load open circuit under (1) open-circuit condition is very low, and can regulate detection threshold according to the situation of load; (2), when not detecting, open detection circuit is closed, and does not have electric current to introduce.
Accompanying drawing explanation
Fig. 1 is a kind of load open-circuit detection circuit structural representation described in the utility model;
Fig. 2 is the circuit diagram of described load open-circuit detection circuit.
Embodiment
In order to allow those skilled in the art can understand the technical solution of the utility model better, below in conjunction with accompanying drawing, the utility model is further elaborated.
As shown in Figure 1, the utility model discloses a kind of load open-circuit detection circuit, comprise flash drive circuit module, also comprise the detection opening switch circuit module be connected with flash drive circuit module, and the load open-circuit detection circuit module detected for load open circuit be connected with detection opening switch circuit module.
During concrete enforcement, the flash power output end that described flash drive circuit module comprises an output control pin, a flash driver element and is connected with flash driver element; Described output control pin connects flash driver element and is used for the unlatching of given control signal control flash driver element; Described detection opening switch circuit module comprises a triode Q2, a P-MOS pipe Q1, and by resistance R4 be connected with the base stage of described triode Q2 for controlling to detect the switch control rule pin that opening switch is opened; The collector of described triode Q2 is connected with the grid of P-MOS pipe Q1 by resistance R2, and the drain electrode of described P-MOS pipe Q1 is connected with resistance R11 with divider resistance R3 respectively, and the source electrode of described P-MOS pipe Q1 is connected with+5V leakage current test power supply; Described load open-circuit detection circuit module comprises a comparer U1, a N-MOS pipe Q3, and feeds back pin by the load open circuit that resistance R10 is connected with the drain electrode of described N-MOS pipe Q3; The output terminal of described comparer U1 is connected with the grid of described N-MOS pipe Q3, the negative input of described comparer U1 is connected with described flash power output end by resistance R6 and diode D1, the positive input of described comparer U1 passes through the+5V leakage current test power supply dividing potential drop of resistance R7 and resistance R8, the source ground of described N-MOS pipe Q3, the drain electrode of described N-MOS pipe Q3 is connected with+5V leakage current test power supply by R9.
As shown in Figure 2, the course of work is as follows: P-MOS pipe Q1 serves as on-off action, and when the output control pin M1 be connected with flash drive circuit module input end is low level, flash driver element exports closes.When the detection opening switch control pin be connected with the base stage of triode Q2 is low level, the collector of triode Q2 is unsettled, and the voltage of the grid of P-MOS pipe Q1 equals the voltage of source electrode, and now P-MOS pipe Q1 ends, now do not carry out load open circuit detection, also do not introduce to load and detect electric current; When the detection opening switch control pin be connected with the base stage of triode Q2 is high level, triode Q2 saturation conduction, P-MOS pipe Q1 closes, resistance R3 be open circuit when detecting pull-up resistor, and introduce the leakage current test power supply of+5V to drain electrode place of P-MOS pipe Q1; When there being load to be connected with flash power output end, the negative input input voltage vin-=5*R3/ (R3+Rload) of comparer U1 (wherein, Rload is the resistance of load) be less than positive input input voltage vin +=5*R8 (R7+R8), comparer U1 output terminal exports high level, N-MOS pipe Q3 conducting is opened, load open circuit feedback pin M2 is low level, now judges that load is not opened a way; When flash drive circuit module is unloaded, when the negative input input voltage vin-=+ 5V of comparer U1 is greater than positive input input voltage vin +=5*R8 (R7+R8), comparer U1 output terminal output low level, and N-MOS pipe Q3 ends, load open circuit feedback pin M2 is high level.Wherein, the value of resistance R3 and R7, R8 can adjust arbitrarily according to the demand of the size of load and detection electric current.
The present embodiment is more excellent embodiment of the present utility model, and the part be not described in detail all adopts known mature technology.It should be noted that; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the utility model, but these change and are out of shape the protection domain that all should belong to the claim appended by the utility model.
Claims (4)
1. a load open-circuit detection circuit, comprise flash drive circuit module, it is characterized in that, also comprise the detection opening switch circuit module be connected with flash drive circuit module, and the load open-circuit detection circuit module detected for load open circuit be connected with detection opening switch circuit module.
2. a kind of load open-circuit detection circuit according to claim 1, is characterized in that, the flash power output end that described flash drive circuit module comprises an output control pin, a flash driver element and is connected with flash driver element; Described output control pin connects flash driver element and is used for the unlatching of given control signal control flash driver element.
3. a kind of load open-circuit detection circuit according to claim 2, it is characterized in that, described detection opening switch circuit module comprises a triode Q2, a P-MOS pipe Q1, and by resistance R4 be connected with the base stage of described triode Q2 for controlling to detect the switch control rule pin that opening switch is opened; The collector of described triode Q2 is connected with the grid of P-MOS pipe Q1 by resistance R2, and the drain electrode of described P-MOS pipe Q1 is connected with resistance R11 with divider resistance R3 respectively, and the source electrode of described P-MOS pipe Q1 is connected with+5V leakage current test power supply.
4. a kind of load open-circuit detection circuit according to claim 3, it is characterized in that, described load open-circuit detection circuit module comprises a comparer U1, a N-MOS pipe Q3, and feeds back pin by the load open circuit that resistance R10 is connected with the drain electrode of described N-MOS pipe Q3; The output terminal of described comparer U1 is connected with the grid of described N-MOS pipe Q3, the negative input of described comparer U1 is connected with described flash power output end by resistance R6 and diode D1, the positive input of described comparer U1 passes through the+5V leakage current test power supply dividing potential drop of resistance R7 and resistance R8, the source ground of described N-MOS pipe Q3, the drain electrode of described N-MOS pipe Q3 is connected with+5V leakage current test power supply by R9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420808718.9U CN204241613U (en) | 2014-12-19 | 2014-12-19 | A kind of load open-circuit detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420808718.9U CN204241613U (en) | 2014-12-19 | 2014-12-19 | A kind of load open-circuit detection circuit |
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| CN204241613U true CN204241613U (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420808718.9U Expired - Fee Related CN204241613U (en) | 2014-12-19 | 2014-12-19 | A kind of load open-circuit detection circuit |
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| CN (1) | CN204241613U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108603917A (en) * | 2015-12-03 | 2018-09-28 | 法国大陆汽车公司 | For detecting the method for disconnecting load |
| CN109791175A (en) * | 2016-07-25 | 2019-05-21 | 大陆汽车系统公司 | Half-bridge driver fault diagnosis system and method |
| CN110154941A (en) * | 2019-04-29 | 2019-08-23 | 惠州市德赛西威汽车电子股份有限公司 | A kind of band is accurately opened a way the low side driving circuit and its detection method of detection |
| CN111157875A (en) * | 2019-12-31 | 2020-05-15 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN112269149A (en) * | 2020-10-16 | 2021-01-26 | 深圳市沃特沃德股份有限公司 | Micro-current load open circuit detection circuit and terminal equipment |
| CN112455366B (en) * | 2020-10-14 | 2023-05-16 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting high-side load open circuit |
| CN116388116A (en) * | 2023-04-20 | 2023-07-04 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
-
2014
- 2014-12-19 CN CN201420808718.9U patent/CN204241613U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108603917A (en) * | 2015-12-03 | 2018-09-28 | 法国大陆汽车公司 | For detecting the method for disconnecting load |
| CN109791175B (en) * | 2016-07-25 | 2021-05-18 | 大陆汽车系统公司 | Half-bridge driver fault diagnosis system and method |
| CN109791175A (en) * | 2016-07-25 | 2019-05-21 | 大陆汽车系统公司 | Half-bridge driver fault diagnosis system and method |
| CN110154941A (en) * | 2019-04-29 | 2019-08-23 | 惠州市德赛西威汽车电子股份有限公司 | A kind of band is accurately opened a way the low side driving circuit and its detection method of detection |
| CN110154941B (en) * | 2019-04-29 | 2022-08-26 | 惠州市德赛西威汽车电子股份有限公司 | Low-side driving circuit with accurate open circuit detection and detection method thereof |
| CN111157875A (en) * | 2019-12-31 | 2020-05-15 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN111157875B (en) * | 2019-12-31 | 2021-11-02 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN112255937B (en) * | 2020-09-18 | 2024-03-19 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN112455366B (en) * | 2020-10-14 | 2023-05-16 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting high-side load open circuit |
| CN112269149A (en) * | 2020-10-16 | 2021-01-26 | 深圳市沃特沃德股份有限公司 | Micro-current load open circuit detection circuit and terminal equipment |
| CN116388116A (en) * | 2023-04-20 | 2023-07-04 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
| CN116388116B (en) * | 2023-04-20 | 2024-05-14 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Patentee after: HUIZHOU DESAY SV AUTOMOTIVE Co.,Ltd. Address before: 516006 Guangdong province Huizhou City Zhongkai high tech Zone and five West Road No. 103 Patentee before: HUIZHOU DESAY SV AUTOMOTIVE Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 |