CN203814006U - LED working state detection circuit - Google Patents
LED working state detection circuit Download PDFInfo
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- CN203814006U CN203814006U CN201420137556.0U CN201420137556U CN203814006U CN 203814006 U CN203814006 U CN 203814006U CN 201420137556 U CN201420137556 U CN 201420137556U CN 203814006 U CN203814006 U CN 203814006U
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Abstract
The utility model relates to an LED working state detection circuit. The circuit comprises a current limiting resistor, an LED indicating lamp, a detector circuit, and a switch circuit. The two terminals of the current limiting resistor are respectively connected to a power supply and the positive pole of the LED indicating light, the negative pole of the LED indicating light is connected to the switch circuit and then is connected to the ground, and the detection circuit is connected to the positive pole of the LED indicating light. The detection circuit comprises two divider resistors, one detection resistor and a detection signal output terminal, wherein the two divider resistors are serially connected, then one end of the serially-connected resistors is connected to the positive pole of the LED indicating light, the other end of the serially-connected resistors is connected to the ground, and the detection signal output terminal is connected to a node between the two divider resistors through the detection resistor. A voltage detection method is adopted in the novel LED working state detection circuit, production cost is largely reduced, and the LED working state namely open circuit, short circuit, and normal working state can be precisely determined through reasonable selection of divider resistor and sampling voltage access point.
Description
Technical field
The utility model relates to a kind of state detection circuit, particularly a kind of LED Working state checking circuit.
Background technology
Some relates to the module of automotive safety function, take air bag as example, and its air bag module and indicator light are separately to design, and air bag has special producer's design, and its indicator light may be integrated in another module (such as air-conditioner controller).This may be two different producers, and the indicator light of air bag need to detect in real time to its operating state, if while breaking down to differentiate be air bag module fault, or air bag indicator light fault (open circuit/short circuit) causes wrong report.Indicator light is generally LED lamp, because LED is Flow Control type device, detect its operating state, the general little high-precision sampling resistor (as shown in Figure 1) of connecting in LED branch road, then gather the voltage at resistance two ends, thereby accurately calculate the electric current that current LED flows through, then be sent to MCU(microprocessor by INA139 inverted signal) in, MCU can judge according to size of current the operating state of LED.But higher all somewhat expensive of general special-purpose current sample chip precision, the product of making has no competitiveness.
Summary of the invention
The purpose of this utility model is in order to overcome the defect of above-mentioned background technology, and a kind of LED Working state checking circuit is provided.
A LED Working state checking circuit, it comprises current-limiting resistance, LED light, testing circuit, switching circuit; Described current-limiting resistance two ends connect respectively the positive pole of power supply and described LED light, and described LED light negative pole connects ground connection after described switching circuit; Described testing circuit with shown in LED light is anodal is connected.Described testing circuit comprises that two divider resistances, one detect resistance and detection signal lead-out terminal, and after described two divider resistances series connection, to connect described LED light anodal in one end, other end ground connection; Described detection signal lead-out terminal is connected to described in two on the node between divider resistance by detecting resistance.
Further, described testing circuit also comprises an electric capacity, and described electric capacity one end connects the node between described detection terminal and described detection resistance, other end ground connection.
Further, described switching circuit comprises a triode, the first switch resistance, second switch resistance and control switch terminal; Described transistor collector is connected with described LED light negative pole, described control switch terminal is connected with described transistor base by described the first switch resistance, described second switch resistance two ends connect respectively the node between earth terminal and described the first switch resistance and described transistor base, described transistor emitter ground connection.
Preferably, described LED light negative pole is also by a capacity earth.
Preferably, the utility model also comprises an external switch circuit, described external switch circuit comprises PNP damping triode and NPN damping triode, the emitter of described PNP damping triode connects power supply, collector electrode connects described current-limiting resistance, and base stage is connected with the collector electrode of described NPN damping triode; Described NPN damping transistor emitter ground connection, base stage is connected with described control switch terminal.
LED Working state checking circuit of the present utility model is used the method for voltage detecting, greatly reduce production cost, by choose reasonable divider resistance, and choose reasonable sampled voltage access point, LED open circuit, short circuit and normal operating conditions can accurately be distinguished.
Accompanying drawing explanation
Fig. 1 is LED Working state checking circuit in prior art.
Fig. 2 is the LED Working state checking circuit in the utility model embodiment mono-.
Fig. 3 is the LED Working state checking circuit in the utility model embodiment bis-.
Embodiment
In order to allow those skilled in the art more understand the technical solution of the utility model, below in conjunction with the drawings and specific embodiments, LED Working state checking circuit of the present utility model is further described.
Embodiment 1:
A kind of LED Working state checking circuit 1, mainly for detection of the state of LED, as open circuit, short circuit and normally work.As shown in Figure 2.
It comprises current-limiting resistance R1, and for sharing power supply POWER voltage, protective circuit is not burned;
LED light D1, the operating state of module under feedback;
Testing circuit 1, for detection of the state of LED light D1;
Switching circuit 2, the switch of control LED light D1.
Concrete, current-limiting resistance R1 one end connects power supply POWER, and the other end connects the positive pole of LED light D1, and LED light D1 negative pole connects the rear ground connection of described switching circuit 2.The anodal also connection detection circuit 1 of LED light D1.
In the present embodiment, testing circuit 1 comprises that two divider resistances, one detect resistance R 4 and detection signal lead-out terminal MCU_DET, and after two divider resistances (R2, R3) series connection, to connect described LED light D1 anodal in one end, other end ground connection; Described detection signal lead-out terminal MCU_DET is connected to described in two on the node between divider resistance by detecting resistance R 4.Detection signal lead-out terminal MCU_DET outwards connects the detection signal input of microprocessor.
Preferably, for detection signal is more accurate, testing circuit 1 also comprises a capacitor C 1, and capacitor C 1 one end connects detection terminal and detects the node between resistance R 4, other end ground connection.
Preferably, in order to guarantee the useful life of LED light D1 and stablizing of circuit, the negative pole of LED light D1 also connects the capacitor C 2 of a ground connection.
When the utility model is worked, power supply POWER is added on LED light D1 through the voltage with a safety after the dividing potential drop of current-limiting resistance R1, testing circuit 1 is connected with the positive pole of LED light D1, according to the difference of actual power, adjust the resistance value ratio of two divider resistances, can produce a more rational electric resistance partial pressure value, microprocessor will obtain a magnitude of voltage by detecting lead-out terminal.According to the different conditions of LED light D1, this magnitude of voltage has three kinds of situations, respectively as following table:
In upper table, Vbat is power supply POWER magnitude of voltage, and the forward voltage drop of LED light D1 is a fixed value.According to these three kinds of situations, microprocessor is preset, can be obtained real-time and accurately the state of LED light D1.
Aspect switching circuit 2, it comprises a triode Q1, two resistance and control switch terminal MCU_CTRL; Triode Q1 collector electrode is connected with the negative pole of LED light D1, and the base stage of triode Q1 is connected with control switch terminal MCU_CTRL after connecting the first switch resistance R5, and control switch terminal MCU_CTRL outwards connects the switch control end of microprocessor.Second switch resistance R 6 two ends connect respectively the node between earth terminal and the first switch resistance R5 and triode Q1 base stage, triode Q1 grounded emitter.When the switch control end of microprocessor is exported high level, the triode Q1 conducting in switching circuit 2, now switching circuit 2 is conducting state; When the switch control end output low level of microprocessor, the triode Q1 cut-off in switching circuit 2, now switching circuit 2 is off-state.
Embodiment 2:
When the utility model is used for automobile, due to automobile power source, automobile batteries is steady power supply, and the control requirement to quiescent current is higher after automobile flameout, so there is following preferred embodiment.
As shown in Figure 3.According to the LED Working state checking circuit 1 described in embodiment 1, it also comprises an external switch circuit 3.In the present embodiment, external switch circuit 3 comprises a PNP damping triode Q4, a NPN damping triode Q3.The emitter of PNP damping triode Q4 connects power supply POWER, and collector electrode connects described current-limiting resistance R1, and base stage is connected with the collector electrode of NPN damping triode Q3.NPN damping triode Q3 grounded emitter, base stage is connected with control switch terminal MCU_CTRL.Same, switch control switch terminal MCU_CTRL outwards connects the switch control end of microprocessor, realizes switching circuit 2 and external switch circuit 3 Synchronization Control.When the switch control end of microprocessor is exported high level, NPN damping triode Q3 conducting, the base voltage of now PNP damping triode Q4 is dragged down, PNP damping triode Q4 conducting, 3 conductings of external switch circuit; During the switch control end output low level of microprocessor, NPN damping triode Q3 cut-off, the base voltage of now PNP damping triode Q4 is higher, PNP damping triode Q4 cut-off, external switch circuit 3 disconnects.
Preferably, above-mentioned two damping triodes can be used a PBLS6003D triode chip to replace.
By reference to the accompanying drawings execution mode of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (5)
1. a LED Working state checking circuit, is characterized in that: comprise current-limiting resistance, LED light, testing circuit, switching circuit; Described current-limiting resistance two ends connect respectively the positive pole of power supply and described LED light, and described LED light negative pole connects ground connection after described switching circuit; Described testing circuit with shown in LED light is anodal is connected; Described testing circuit comprises that two divider resistances, one detect resistance and detection signal lead-out terminal, and after described two divider resistances series connection, to connect described LED light anodal in one end, other end ground connection; Described detection signal lead-out terminal is connected to described in two on the node between divider resistance by detecting resistance.
2. LED Working state checking circuit as claimed in claim 1, is characterized in that: described testing circuit also comprises an electric capacity, and described electric capacity one end connects the node between described detection terminal and described detection resistance, other end ground connection.
3. LED Working state checking circuit as claimed in claim 1, is characterized in that: described switching circuit comprises a triode, the first switch resistance, second switch resistance and control switch terminal; Described transistor collector is connected with described LED light negative pole, described control switch terminal is connected with described transistor base by described the first switch resistance, described second switch resistance two ends connect respectively the node between earth terminal and described the first switch resistance and described transistor base, described transistor emitter ground connection.
4. LED Working state checking circuit as claimed in claim 1, is characterized in that: described LED light negative pole is also by a capacity earth.
5. LED Working state checking circuit as claimed in claim 3, it is characterized in that: also comprise an external switch circuit, described external switch circuit comprises PNP damping triode and NPN damping triode, the emitter of described PNP damping triode connects power supply, collector electrode connects described current-limiting resistance, and base stage is connected with the collector electrode of described NPN damping triode; Described NPN damping transistor emitter ground connection, base stage is connected with described control switch terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420137556.0U CN203814006U (en) | 2014-03-26 | 2014-03-26 | LED working state detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420137556.0U CN203814006U (en) | 2014-03-26 | 2014-03-26 | LED working state detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203814006U true CN203814006U (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420137556.0U Expired - Fee Related CN203814006U (en) | 2014-03-26 | 2014-03-26 | LED working state detection circuit |
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| CN (1) | CN203814006U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016041123A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Open-circuit detection circuit for led emergency lamp power supply |
| CN108235212A (en) * | 2017-12-26 | 2018-06-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of open detection circuit of horn circuit |
| CN110636664A (en) * | 2019-08-02 | 2019-12-31 | 惠州市德赛西威汽车电子股份有限公司 | Indicator lamp driving circuit with diagnosis function |
| CN111751757A (en) * | 2020-07-22 | 2020-10-09 | 上海麦腾物联网技术有限公司 | Fault detection circuit and method for vehicle-mounted indicator lamp |
| CN112498272A (en) * | 2020-11-26 | 2021-03-16 | 惠州市德赛西威汽车电子股份有限公司 | Alarm lamp diagnostic circuit and automobile instrument |
| CN113671343A (en) * | 2021-08-12 | 2021-11-19 | 北京比特大陆科技有限公司 | Computing force board, data processing equipment and computer server |
| CN113879163A (en) * | 2021-09-30 | 2022-01-04 | 长春捷翼汽车零部件有限公司 | Electric automobile charging seat, detection method thereof and electric automobile |
| WO2023036298A1 (en) * | 2021-09-10 | 2023-03-16 | 长春捷翼汽车零部件有限公司 | Control circuit capable of detecting short circuit and open circuit of led, and charging base and electric vehicle |
| WO2024125576A1 (en) * | 2022-12-13 | 2024-06-20 | Hesai Technology Co., Ltd. | Laser driving circuit and method, chip, and lidar |
-
2014
- 2014-03-26 CN CN201420137556.0U patent/CN203814006U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016041123A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Open-circuit detection circuit for led emergency lamp power supply |
| CN108235212A (en) * | 2017-12-26 | 2018-06-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of open detection circuit of horn circuit |
| CN110636664A (en) * | 2019-08-02 | 2019-12-31 | 惠州市德赛西威汽车电子股份有限公司 | Indicator lamp driving circuit with diagnosis function |
| CN110636664B (en) * | 2019-08-02 | 2022-11-11 | 惠州市德赛西威汽车电子股份有限公司 | Indicator lamp driving circuit with diagnosis function |
| CN111751757A (en) * | 2020-07-22 | 2020-10-09 | 上海麦腾物联网技术有限公司 | Fault detection circuit and method for vehicle-mounted indicator lamp |
| CN112498272A (en) * | 2020-11-26 | 2021-03-16 | 惠州市德赛西威汽车电子股份有限公司 | Alarm lamp diagnostic circuit and automobile instrument |
| CN113671343A (en) * | 2021-08-12 | 2021-11-19 | 北京比特大陆科技有限公司 | Computing force board, data processing equipment and computer server |
| CN113671343B (en) * | 2021-08-12 | 2024-07-02 | 北京比特大陆科技有限公司 | Force calculating plate, data processing equipment and computer server |
| WO2023036298A1 (en) * | 2021-09-10 | 2023-03-16 | 长春捷翼汽车零部件有限公司 | Control circuit capable of detecting short circuit and open circuit of led, and charging base and electric vehicle |
| CN113879163A (en) * | 2021-09-30 | 2022-01-04 | 长春捷翼汽车零部件有限公司 | Electric automobile charging seat, detection method thereof and electric automobile |
| WO2024125576A1 (en) * | 2022-12-13 | 2024-06-20 | Hesai Technology Co., Ltd. | Laser driving circuit and method, chip, and lidar |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20150326 |
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| EXPY | Termination of patent right or utility model |