CN207505175U - A kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit - Google Patents
A kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit Download PDFInfo
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- CN207505175U CN207505175U CN201721424311.6U CN201721424311U CN207505175U CN 207505175 U CN207505175 U CN 207505175U CN 201721424311 U CN201721424311 U CN 201721424311U CN 207505175 U CN207505175 U CN 207505175U
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Abstract
The utility model discloses a kind of low-temp low-pressure taillight diagnostic systems of LED based driving circuit,Include input unit,Counnter attack unit,Filter unit,Constant current unit,LED light and LED diagnostic systems,The input unit is to be powered using the vehicle body of vehicle,Circuit is will not be burnt out when power positive cathode reversal connection by the counnter attack unit,The filter unit is the filter circuit of vehicle power supply input,The constant current unit is to export the module of constant current,The LED light is made of LEDs matrixes,The output terminal of the input unit is connect with counnter attack unit,The output terminal of the counnter attack unit is connect with filter unit,The output terminal of the filter unit is connect with constant current unit,The output terminal of the constant current unit is connect with LED light,The LED diagnostic systems are directly connect with constant current unit,The diagnostic system is by voltage output to BCM；Logic control signal is generated by being provided with diagnostic system, so as to diagnose the output of the height of output level.
Description
Technical field
The utility model is related to the low of automobile tail light diagnostic techniques field more particularly to a kind of LED based driving circuit
Warm low pressure taillight diagnostic system.
Background technology
LED lighting technology has had been applied in each different electronic field, for example, architectural lighting, vehicle head taillight,
Backlight of LCD liquid crystal displays etc., compared with traditional light source such as incandescent lamp and fluorescent lamp, LED has significant advantage, including
Efficiently, good directionality and colour stability, very high reliability, longer seeervice cycle, small size and Environmental security
Property.
It is to rely on MCU mostly when LED light breaks down with a large amount of uses of LED light（In circuit without micro-control
Unit processed）It is diagnosed, diagnostic signal level is obtained from the cathode of LED light, and feedback level is unstable, easily by temperature
Influence, cause this diagnostic circuit that can not normally be worked in the environment of low-temp low-pressure, therefore, solve this and a kind of ask
Topic is particularly important.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of low-temp low-pressure tail of LED based driving circuit
Lamp diagnostic system generates logic control signal by being provided with diagnostic system, so as to diagnose the output of the height of output level.
To solve the above-mentioned problems, the utility model provides a kind of low-temp low-pressure taillight of LED based driving circuit
Diagnostic system includes input unit, counnter attack unit, filter unit, constant current unit, LED light and LED diagnostic systems, described defeated
It is to be powered using the vehicle body of vehicle to enter unit, and circuit is will not be burnt out when power positive cathode reversal connection by the counnter attack unit, institute
The filter circuit that filter unit is vehicle power supply input is stated, the constant current unit is to export the module of constant current, the LED light
It is made of LEDs matrixes, the output terminal of the input unit is connect with counnter attack unit, the output terminal of the counnter attack unit and filtering
Unit connects, and the output terminal of the filter unit is connect with constant current unit, and the output terminal of the constant current unit is connect with LED light,
The LED diagnostic systems are directly connect with constant current unit, and the diagnostic system is by voltage output to BCM.
Further improvement lies in that：The diagnostic system be made of triode, capacitance, divider resistance and pass through triode and
The characteristic of resistance is so as to be formed into a loop.
Further improvement lies in that：The diagnostic system is provides pressure when LED light is just always on by constant-current source for triode
For drop so as to which triode be opened, the level exported at this time is high level, and passes through three pole of divider resistance when LED light disconnects
It is 0 level that pipe, which can not be opened so as to cause diagnosis output voltage, simultaneously because the required pressure drop of triode is from constant current unit
Place obtains, thus can't because of high/low temperature influence so as to cause being diagnosed to be what incumbent problem.
The beneficial effects of the utility model are：The diagnostic signal level of the utility model be not obtained from LED cathode and
It is to be obtained at the resistance of constant current unit, the feedback level obtained in this way is relatively steady, and will not be by temperature and LED voltage
It influences relatively independent, higher level can be provided, while again can be cost-effective, and by using triode, pass through Diagnostic LEDs
Whether lamp, which fails, is sequentially generated logic control signal, so as to generate low and high level, and is fed back to BCM, the utility model can
Feedback signal in the case of low-temp low-pressure to be provided to and can provided a relatively high voltage level, the utility model
Suitable for building for automobile electronic system.
Description of the drawings
Fig. 1 is the functional structure chart of the utility model.
Specific embodiment
In order to deepen the understanding to the utility model, the utility model is further described below in conjunction with embodiment,
The present embodiment is only used for explaining the utility model, does not form the restriction to scope of protection of the utility model.
As shown in Figure 1, a kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit is present embodiments provided,
Include input unit, counnter attack unit, filter unit, constant current unit, LED light and LED diagnostic systems, the input unit is makes
It is powered with the vehicle body of vehicle, circuit is will not be burnt out when power positive cathode reversal connection by the counnter attack unit, the filter unit
For the filter circuit of vehicle power supply input, the constant current unit is to export the module of constant current, and the LED light is by LEDs matrixes
Composition, the output terminal of the input unit are connect with counnter attack unit, and the output terminal of the counnter attack unit is connect with filter unit, institute
The output terminal for stating filter unit is connect with constant current unit, and the output terminal of the constant current unit is connect with LED light, the LED diagnosis
System is directly connect with constant current unit, and the diagnostic system is by voltage output to BCM.The diagnostic system by triode, capacitance,
Divider resistance forms and passes through triode and the characteristic of resistance is so as to be formed into a loop.The diagnostic system is when LED light is normal
Pressure drop is provided so as to which triode be opened for triode by constant-current source when bright, and the level exported at this time is high level, and works as LED
It is 0 level that can not be opened so as to cause diagnosis output voltage by divider resistance triode when lamp disconnects, simultaneously because three
The required pressure drop of pole pipe is obtained at constant current unit, thus can't because of high/low temperature influence so as to cause being diagnosed to be
What incumbent problem.Be provided with adjusting unit in the LED light, the adjusting unit for graded resistance come adjust current parameters so as to
Carry out the bright dark changes of LED.
The diagnostic signal level of the utility model is not to obtain from LED cathode but obtained at the resistance of constant current unit
Arrive, the feedback level obtained in this way is relatively steady, and will not be influenced by temperature with LED voltage it is relatively independent, can provide compared with
High level, while again can be cost-effective, and by using triode, logic is sequentially generated by the way that whether Diagnostic LEDs lamp fails
Control signal, so as to generate low and high level, and be fed back to BCM, the utility model can in the case of low-temp low-pressure incite somebody to action
Feedback signal provides and can provide a relatively high voltage level, and the utility model is suitable for taking for automobile electronic system
It builds.
Claims (4)
1. a kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit, it is characterised in that：Include input unit,
Counnter attack unit, filter unit, constant current unit, LED light and LED diagnostic systems, the input unit are to be supplied using the vehicle body of vehicle
Electricity, will not to burn out circuit when power positive cathode reversal connection, the filter unit inputs the counnter attack unit for vehicle power supply
Filter circuit, the constant current unit is to export the module of constant current, and the LED light is made of LEDs matrixes, the input
The output terminal of unit is connect with counnter attack unit, and the output terminal of the counnter attack unit is connect with filter unit, the filter unit
Output terminal is connect with constant current unit, and the output terminal of the constant current unit is connect with LED light, the LED diagnostic systems directly with perseverance
Unit connection is flowed, the diagnostic system is by voltage output to BCM.
2. a kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit as described in claim 1, feature exist
In：The diagnostic system is made of triode, capacitance, divider resistance and passes through triode and the characteristic of resistance is so as to form back
Road.
3. a kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit as claimed in claim 2, feature exist
In：The diagnostic system to provide pressure drop for triode so as to which triode be opened by constant current unit when LED light is just always on,
The level exported at this time is high level, and when LED light is disconnected by divider resistance triode can not open so as to cause
Diagnosis output voltage is 0 level, simultaneously because the required pressure drop of triode is obtained at constant current unit, so can't
Because the influence of high/low temperature is so as to cause being diagnosed to be what incumbent problem.
4. a kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit as claimed in claim 2, feature exist
In：Adjusting unit is provided in the LED light, the adjusting unit adjusts current parameters so as to carry out LED for graded resistance
Bright dark change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721424311.6U CN207505175U (en) | 2017-10-31 | 2017-10-31 | A kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721424311.6U CN207505175U (en) | 2017-10-31 | 2017-10-31 | A kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207505175U true CN207505175U (en) | 2018-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721424311.6U Active CN207505175U (en) | 2017-10-31 | 2017-10-31 | A kind of low-temp low-pressure taillight diagnostic system of LED based driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107820345A (en) * | 2017-10-31 | 2018-03-20 | 马瑞利汽车零部件(芜湖)有限公司 | A kind of low-temp low-pressure taillight diagnostic system of LED-based drive circuit |
-
2017
- 2017-10-31 CN CN201721424311.6U patent/CN207505175U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107820345A (en) * | 2017-10-31 | 2018-03-20 | 马瑞利汽车零部件(芜湖)有限公司 | A kind of low-temp low-pressure taillight diagnostic system of LED-based drive circuit |
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