CN105372604A - LED automobile lamp test circuit with over-temperature protection instruction function - Google Patents
LED automobile lamp test circuit with over-temperature protection instruction function Download PDFInfo
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- CN105372604A CN105372604A CN201510527884.0A CN201510527884A CN105372604A CN 105372604 A CN105372604 A CN 105372604A CN 201510527884 A CN201510527884 A CN 201510527884A CN 105372604 A CN105372604 A CN 105372604A
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Abstract
The invention provides an LED automobile lamp test circuit with an over-temperature protection instruction function, comprising an input anti-reverse-connection and voltage conversion circuit, an over-temperature protection circuit, a PWM waveform generation circuit, and an orange over-temperature indicator lamp. The circuit can output two PWM waveforms and four direct voltages. When the circuit is applied to a closed box, the ambient temperature of the circuit board can be detected in real time. When the ambient temperature of the closed box exceeds a set value, the over-temperature protection circuit is started, the PWM waveform generation circuit is closed, and the orange over-temperature indicator lamp is turned on.
Description
Technical field
The present invention relates to technical field of automobile, particularly relate to a kind of LED car lamp test circuit with overheat protector instruction.
Background technology
Along with the develop rapidly of automobile industry; car light technology also has change with rapid changepl. never-ending changes and improvements; the car light field that is applied to that PWM technology is more and more general especially and car light field tests; traditional when testing car light; the temperature of real-time monitoring circuit plate, when exceeding design temperature threshold value, components and parts can be subject to high temperature failure, short circuit, open circuit etc.; and then Devices to test car light cannot be protected, the problem therefore solving this class seems particularly important.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of LED car lamp test circuit with overheat protector instruction, have the feature that structure is simple, with low cost and safe and reliable.
In order to solve the problem of above-mentioned background technology, the invention provides a kind of LED car lamp test circuit with overheat protector instruction, include the anti-reverse and photovoltaic conversion circuit of input, thermal-shutdown circuit, PWM wave generator circuit, and orange excess temperature pilot lamp LD1, anti-reverse and the photovoltaic conversion circuit of described input is by inputting anti-reverse diode D1, voltage conversion chip IC1 and input/output terminal filter capacitor composition, described thermal-shutdown circuit is by stabilivolt DZ1, temperature sensor RT1 and triode T1 forms, described orange excess temperature pilot lamp LD1 is connected on PWM wave generator circuit, four pin of the output terminal of the anti-reverse and photovoltaic conversion circuit of described input are connected to PWM wave generator circuit R5 and R7 common port, the chip U1 of PWM wave generator circuit is connected with tripod and is connected to the grid of metal-oxide-semiconductor M1, the positive pole of described metal-oxide-semiconductor M1 is connected to power end 12V, temperature sensor RT1 one end of described thermal-shutdown circuit is connected to ground, the other end is connected to triode T1 base stage, the collector of described triode T1 is connected to the negative pole of orange excess temperature pilot lamp LD1, the positive pole of described orange excess temperature pilot lamp LD1 is connected to the RST end pin of PWM wave generator circuit.
Further improvement is: the anti-reverse and photovoltaic conversion circuit of described input provides operating voltage for the PWM chip U1 of PWM wave generator circuit, and PWM chip U1 can produce the square wave of fixed duty cycle and frequency, and this square wave is exported by the tripod of U1.
The invention has the beneficial effects as follows: circuit of the present invention exportable two-way PWM waveform and four tunnel DC voltage; when described circuit application is in closed box; can detecting real-time circuit board environment temperature; when closed box environment temperature exceedes setting value; thermal-shutdown circuit starts; close PWM wave generator circuit, some bright orange excess temperature pilot lamp.The present invention adds thermal-shutdown circuit and orange LED excess temperature pilot lamp cleverly on PWM testing circuit board, successfully avoid Yin Wendu too high and damage circuit board component and then damage the phenomenon of Devices to test car light.
Accompanying drawing explanation
Fig. 1 is the anti-reverse and photovoltaic conversion circuit of input of the present invention.
Fig. 2 is thermal-shutdown circuit figure of the present invention.
Fig. 3 is PWM wave generator circuit of the present invention and orange excess temperature indicator light circuit figure.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and this embodiment only for explaining the present invention, does not form limiting the scope of the present invention.
As Fig. 1, 2, shown in 3, present embodiments provide a kind of LED car lamp test circuit with overheat protector instruction, it is characterized in that: include the anti-reverse and photovoltaic conversion circuit of input, thermal-shutdown circuit, PWM wave generator circuit, and orange excess temperature pilot lamp LD1, anti-reverse and the photovoltaic conversion circuit of described input is by inputting anti-reverse diode D1, voltage conversion chip IC1 and input/output terminal filter capacitor composition, , described orange excess temperature pilot lamp LD1 is connected on PWM wave generator circuit, four pin of the output terminal of the anti-reverse and photovoltaic conversion circuit of described input are connected to PWM wave generator circuit R5 and R7 common port, the chip U1 of PWM wave generator circuit is connected with tripod and is connected to the grid of metal-oxide-semiconductor M1, the positive pole of described metal-oxide-semiconductor M1 is connected to power end 12V, during metal-oxide-semiconductor M1 conducting, the approximate ground connection of drain electrode, have electric current to flow through in LED to light, when metal-oxide-semiconductor M1 turns off, drain electrode and ground disconnect, in LED, no current flows through, LED extinguishes.Described thermal-shutdown circuit is by stabilivolt DZ1, temperature sensor RT1 and triode T1 forms, when this Circuits System temperature is increased to setting threshold value, temperature sensor RT1 resistance can become large, RT1 divides voltage raises, temperature sensor RT1 one end is connected to ground, the other end is connected to triode T1 base stage, triode T1 conducting, the collector of described triode T1 is connected to the negative pole of orange excess temperature pilot lamp LD1, the positive pole of described orange excess temperature pilot lamp LD1 is connected to the RST end pin of PWM wave generator circuit when triode ON, LD1 negative pole is similar to ground connection, electric current is had to flow through in LD1, LD1 sends orange-colored light, high temperature indicates.In Fig. 2, PWM chip U1 the 4th pin RST holds approximate ground connection, and PWM chip quits work.When Circuits System temperature is reduced to below setting threshold value, temperature sensor RT1 resistance reduces, and gets voltage and reduces, triode T1 ends, and LD1 negative pole disconnects with ground, and in LD1, no current flows through, orange indication LED is extinguished, and Fig. 2 chips the 4th pin RST holds and disconnects with ground, and chip is resumed work.
Anti-reverse and the photovoltaic conversion circuit of described input provides operating voltage for the PWM chip U1 of PWM wave generator circuit, and PWM chip U1 can produce the square wave of fixed duty cycle and frequency, and this square wave is exported by the tripod of U1.
Circuit of the present invention exportable two-way PWM waveform and four tunnel DC voltage; when described circuit application is in closed box; can detecting real-time circuit board environment temperature; when closed box environment temperature exceedes setting value; thermal-shutdown circuit starts; close PWM wave generator circuit, some bright orange excess temperature pilot lamp.The present invention adds thermal-shutdown circuit and orange LED excess temperature pilot lamp cleverly on PWM testing circuit board, successfully avoid Yin Wendu too high and damage circuit board component and then damage the phenomenon of Devices to test car light.
Claims (2)
1. the LED car lamp test circuit with overheat protector instruction, it is characterized in that: include the anti-reverse and photovoltaic conversion circuit of input, thermal-shutdown circuit, PWM wave generator circuit, and orange excess temperature pilot lamp LD1, anti-reverse and the photovoltaic conversion circuit of described input is by inputting anti-reverse diode D1, voltage conversion chip IC1 and input/output terminal filter capacitor composition, described thermal-shutdown circuit is by stabilivolt DZ1, temperature sensor RT1 and triode T1 forms, described orange excess temperature pilot lamp LD1 is connected on PWM wave generator circuit, four pin of the output terminal of the anti-reverse and photovoltaic conversion circuit of described input are connected to PWM wave generator circuit R5 and R7 common port, the chip U1 of PWM wave generator circuit is connected with tripod and is connected to the grid of metal-oxide-semiconductor M1, the positive pole of described metal-oxide-semiconductor M1 is connected to power end 12V, temperature sensor RT1 one end of described thermal-shutdown circuit is connected to ground, the other end is connected to triode T1 base stage, the collector of described triode T1 is connected to the negative pole of orange excess temperature pilot lamp LD1, the positive pole of described orange excess temperature pilot lamp LD1 is connected to the RST end pin of PWM wave generator circuit.
2. a kind of LED car lamp test circuit with overheat protector instruction as claimed in claim 1; it is characterized in that: the anti-reverse and photovoltaic conversion circuit of described input provides operating voltage for the PWM chip U1 of PWM wave generator circuit; PWM chip U1 can produce the square wave of fixed duty cycle and frequency, and this square wave is exported by the tripod of U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510527884.0A CN105372604B (en) | 2015-08-25 | 2015-08-25 | A kind of LED car lamp test circuit with overheat protector instruction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510527884.0A CN105372604B (en) | 2015-08-25 | 2015-08-25 | A kind of LED car lamp test circuit with overheat protector instruction |
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| Publication Number | Publication Date |
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| CN105372604A true CN105372604A (en) | 2016-03-02 |
| CN105372604B CN105372604B (en) | 2019-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510527884.0A Active CN105372604B (en) | 2015-08-25 | 2015-08-25 | A kind of LED car lamp test circuit with overheat protector instruction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959880A (en) * | 2019-03-20 | 2019-07-02 | 苏州巨擎电子科技有限公司 | A kind of program-controlled car light group lights detection device |
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| CN102944303A (en) * | 2012-11-15 | 2013-02-27 | 创天昱科技(深圳)有限公司 | PWM (pulse width modulation) light source interference resistant illumination detection method and device and light source adjusting method |
| TWM448608U (en) * | 2012-09-28 | 2013-03-11 | zhong-qi Liu | LED lamp set with over-temperature protection function |
| CN103424582A (en) * | 2012-05-17 | 2013-12-04 | 富泰华工业（深圳）有限公司 | Battery analog circuit |
| CN103995224A (en) * | 2014-04-18 | 2014-08-20 | 安徽兆利光电科技有限公司 | LED detection system |
| CN204349432U (en) * | 2014-12-17 | 2015-05-20 | 广州金升阳科技有限公司 | A kind of Switching Power Supply thermal-shutdown circuit |
| CN204989433U (en) * | 2015-08-25 | 2016-01-20 | 马瑞利汽车零部件(芜湖)有限公司 | Take LED car light test circuit of excess temperature protection instruction |
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2015
- 2015-08-25 CN CN201510527884.0A patent/CN105372604B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201171240Y (en) * | 2008-03-05 | 2008-12-24 | 黄鸣 | LED constant-current driver with temperature protection |
| CN202455581U (en) * | 2012-02-21 | 2012-09-26 | 四川虹视显示技术有限公司 | Lighting device with OLED (Organic Light Emitting Diode) driven by PWM (Pulse Width Modulation) |
| CN103424582A (en) * | 2012-05-17 | 2013-12-04 | 富泰华工业（深圳）有限公司 | Battery analog circuit |
| TWM448608U (en) * | 2012-09-28 | 2013-03-11 | zhong-qi Liu | LED lamp set with over-temperature protection function |
| CN102944303A (en) * | 2012-11-15 | 2013-02-27 | 创天昱科技(深圳)有限公司 | PWM (pulse width modulation) light source interference resistant illumination detection method and device and light source adjusting method |
| CN103995224A (en) * | 2014-04-18 | 2014-08-20 | 安徽兆利光电科技有限公司 | LED detection system |
| CN204349432U (en) * | 2014-12-17 | 2015-05-20 | 广州金升阳科技有限公司 | A kind of Switching Power Supply thermal-shutdown circuit |
| CN204989433U (en) * | 2015-08-25 | 2016-01-20 | 马瑞利汽车零部件(芜湖)有限公司 | Take LED car light test circuit of excess temperature protection instruction |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959880A (en) * | 2019-03-20 | 2019-07-02 | 苏州巨擎电子科技有限公司 | A kind of program-controlled car light group lights detection device |
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| Publication number | Publication date |
|---|---|
| CN105372604B (en) | 2019-05-07 |
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Effective date of registration: 20191224 Address after: No.231 Hai'an Road, Changchun Economic and Technological Development Zone, Changchun City, 130000 Jilin Province Patentee after: Changchun Marelli automobile lighting system Co., Ltd Address before: 241000 No. 5 Gate Road, Shiqiao Industrial Park, Wuhu economic and Technological Development Zone, Anhui, China Patentee before: Marelli Automotive Parts (Wuhu) Co., Ltd. |
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