CN201654157U - Fault detection device for LED drive circuit - Google Patents
Fault detection device for LED drive circuit Download PDFInfo
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- CN201654157U CN201654157U CN2010200031115U CN201020003111U CN201654157U CN 201654157 U CN201654157 U CN 201654157U CN 2010200031115 U CN2010200031115 U CN 2010200031115U CN 201020003111 U CN201020003111 U CN 201020003111U CN 201654157 U CN201654157 U CN 201654157U
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- voltage detection
- detection module
- drive circuit
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Abstract
The utility model relates to a fault detection device for an LED drive circuit, which comprises a voltage detection module and a logic circuit, wherein the voltage detection module respectively compares difference value between a detection output signal output by each group of LEDs and a reference voltage signal output by a drive device with an external input set value and outputs identification signal, and the logic circuit performs logic operation to the identification signal output by the voltage detection module and outputs a judgment signal. When one or a plurality of groups of LEDs work, the fault detection device for an LED drive circuit can detect open circuit / short circuit faults of LEDs in real time, and bring convenience for users to accurately position the faults and take measures to prevent the faults of the LEDs from enlarging so as to enable the overall LED drive circuit to work continuously and stably for a long time.
Description
Technical field
The utility model relates to integrated circuit, relates in particular to the failure detector of a kind of LED of being used for (light emitting diode) driving circuit.
Background technology
As everyone knows, in the driving circuit and the application scenario thereof that are used for many group LED, when one or more groups LED works simultaneously, and a part of for a certain reason LED opens a way, during short trouble, if fail to detect or fail in time to detect out of order occurrence positions, then may cause the expansion of fault, the damage of feasible more LED or whole LED driving circuit.Therefore, take place, make the LED steady operation of longer time simultaneously as far as possible, then need the LED of the many groups in the led drive circuit is carried out real-time fault detect for fear of this situation.
The utility model content
In order to address the above problem, the utility model aims to provide a kind of failure detector that is used for led drive circuit, thereby can realize reliably that the open circuit of LED network in the led drive circuit, short trouble detect, and make the sustainable work of whole LED driving circuit.
A kind of failure detector that is used for led drive circuit described in the utility model, described led drive circuit comprises a LED network and the electric supply installation and the drive unit that are connected with this LED network respectively, described LED network comprises N group LED, and N is a natural number, described failure detector comprises a voltage detection module and a logical circuit
Described voltage detection module respectively will from one of described every group of LED output detect input signal and the output of described drive unit a reference voltage signal difference and outside input setting value relatively, and output identification signal;
Described logical circuit carries out logical operation to the identification signal of described voltage detection module output, and exports one and judge signal.
At the above-mentioned failure detector that is used for led drive circuit, described voltage detection module comprises an over-voltage detection circuit that is connected with described logical circuit.
At the above-mentioned failure detector that is used for led drive circuit, described voltage detection module comprises a undervoltage detection circuit that is connected with described logical circuit.
At the above-mentioned failure detector that is used for led drive circuit, described undervoltage detection circuit is respectively the different comparator circuit of a threshold value with over-voltage detection circuit.
Owing to adopted above-mentioned technical solution, the utility model has been realized real-time detection to LED network in the led drive circuit by voltage detection module and logical circuit, and by in voltage detection module, adopting undervoltage detection circuit or over-voltage detection circuit or adopting two undervoltage detection circuit and over-voltage detection circuits that threshold value is different simultaneously, make that the utility model can be when one or more groups LED work, detect open circuit and/or short trouble that LED takes place in real time, and make things convenient for the user that fault is accurately located, the fault that prevents LED to take measures enlarges, thereby makes the whole LED driving circuit to work continually and steadily for a long time.
Description of drawings
Fig. 1 is the fundamental diagram of the preferred embodiment of a kind of failure detector that is used for led drive circuit of the utility model.
Embodiment
As shown in Figure 1, led drive circuit comprises a LED network 3 (as a plurality of LED strings) and the electric supply installation 1 (as the LED power supply) and the drive unit 2 (as the LED constant-current drive circuit) that are connected with this LED network 3 respectively, wherein, LED network 3 comprises N group LED30, and N is a natural number.The utility model, promptly a kind of failure detector 8 that is used for led drive circuit comprises a voltage detection module 45 and a logical circuit 6, wherein:
The identification signal of 6 pairs of voltage detection module of logical circuit, 45 outputs is carried out logical operation, and exports one/group and judge signal 7, whether is in malfunction in order to respectively to organize LED30 in the expression LED networking 3.
In the present embodiment, a kind of principle of work that is used for the failure detector of led drive circuit of the utility model is elaborated.
At first, carry out sampling step, promptly voltage detection module 45 is gathered a detection input signal 32 of every group of LED30 output and the reference voltage signal 31 that drive unit 2 provides.
Next detects step, and promptly voltage detection module 45 compares the difference of each detection input signal 32 and reference voltage signal 31 in the sampling step respectively with the outside setting value of importing, and produces corresponding identification signal; Specifically, detect step and comprise that overvoltage detects step and under-voltage detection step, wherein, it is to detect the first setting value Vt1 whether each difference that detects input signal 32 and reference voltage signal 31 is higher than outside input by the over-voltage detection circuit in the voltage detection module 45 4 that overvoltage detects step, when certain difference that detects input signal 32 and reference voltage signal 31 is elevated to above the first setting value Vt1, and the difference of other detection signals 32 and reference voltage signal 31 represents that then short trouble has appearred in this one group of LED30 that detects input signal 32 of correspondence in the LED networking 3 when remaining unchanged; Under-voltage detection step is to detect the second setting value Vt2 whether each difference that detects input signal 32 and reference voltage signal 31 is lower than outside input by the undervoltage detection circuit in the voltage detection module 45 5, when being reduced to, certain difference that detects input signal 32 and reference voltage signal 31 is lower than the second setting value Vt2, and the difference of other detection signals 32 and reference voltage signal 31 is elevated to and surpasses the first setting value Vt1 or when remaining unchanged, when representing that then open fault has appearred in this one group of LED30 that detects input signal 32 of correspondence in the LED networking 3, promptly this group LED30 has lost drive current.
At last, carry out determining step, be that 6 pairs of logical circuits detect in the step identification signal of over-voltage detection circuit 4 and undervoltage detection circuit 5 outputs and carry out logical operation respectively, thereby judge the position of one or more groups LED30 that breaks down, and produce corresponding judgment signal 7, to make things convenient for the user fault LED is located accurately and timely.
In sum, a kind of failure detector and detection method thereof that is used for led drive circuit of the present utility model can realize reliably that the open circuit, short trouble of LED network in the led drive circuit detects, and makes that the whole LED driving circuit is sustainable stably works.
Below embodiment has been described in detail the utility model in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the utility model according to the above description.Thereby some details among the embodiment should not constitute qualification of the present utility model, and the scope that the utility model will define with appended claims is as protection domain of the present utility model.
Claims (4)
1. failure detector that is used for led drive circuit, described led drive circuit comprises a LED network and the electric supply installation and the drive unit that are connected with this LED network respectively, described LED network comprises N group LED, and N is a natural number, it is characterized in that, described failure detector comprises a voltage detection module and a logical circuit
Described voltage detection module respectively will from one of described every group of LED output detect input signal and the output of described drive unit a reference voltage signal difference and outside input setting value relatively, and output identification signal;
Described logical circuit carries out logical operation to the identification signal of described voltage detection module output, and exports one and judge signal.
2. the failure detector that is used for led drive circuit according to claim 1 is characterized in that, described voltage detection module comprises an over-voltage detection circuit that is connected with described logical circuit.
3. the failure detector that is used for led drive circuit according to claim 1 and 2 is characterized in that, described voltage detection module comprises a undervoltage detection circuit that is connected with described logical circuit.
4. the failure detector that is used for led drive circuit according to claim 3 is characterized in that, described undervoltage detection circuit is respectively the different comparator circuit of a threshold value with over-voltage detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200031115U CN201654157U (en) | 2010-01-04 | 2010-01-04 | Fault detection device for LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200031115U CN201654157U (en) | 2010-01-04 | 2010-01-04 | Fault detection device for LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201654157U true CN201654157U (en) | 2010-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200031115U Expired - Lifetime CN201654157U (en) | 2010-01-04 | 2010-01-04 | Fault detection device for LED drive circuit |
Country Status (1)
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| CN (1) | CN201654157U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762772B (en) * | 2010-01-04 | 2011-08-31 | 上海贝岭股份有限公司 | Fault detection device for LED driving circuit and detection method thereof |
| CN102435904A (en) * | 2011-11-15 | 2012-05-02 | 深圳Tcl新技术有限公司 | Detection method of false short circuit fault of LED circuit and detection circuit thereof |
| CN102435955A (en) * | 2011-10-24 | 2012-05-02 | 天津市中环电子计算机有限公司 | System for testing 11.5W alternating current power supply |
| CN103926500A (en) * | 2014-04-22 | 2014-07-16 | 麦格纳（太仓）汽车科技有限公司 | Method for detecting LED constant current driving circuit performance |
| CN110646746A (en) * | 2019-09-29 | 2020-01-03 | 安徽江淮汽车集团股份有限公司 | Power supply driving fault test system and method |
| CN116761300A (en) * | 2023-08-17 | 2023-09-15 | 深圳莱福德科技股份有限公司 | Abnormality detection method based on multi-signal analysis and application of abnormality detection method in lighting system |
-
2010
- 2010-01-04 CN CN2010200031115U patent/CN201654157U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762772B (en) * | 2010-01-04 | 2011-08-31 | 上海贝岭股份有限公司 | Fault detection device for LED driving circuit and detection method thereof |
| CN102435955A (en) * | 2011-10-24 | 2012-05-02 | 天津市中环电子计算机有限公司 | System for testing 11.5W alternating current power supply |
| CN102435904A (en) * | 2011-11-15 | 2012-05-02 | 深圳Tcl新技术有限公司 | Detection method of false short circuit fault of LED circuit and detection circuit thereof |
| CN102435904B (en) * | 2011-11-15 | 2014-08-20 | 深圳Tcl新技术有限公司 | Detection method of false short circuit fault of LED circuit and detection circuit thereof |
| CN103926500A (en) * | 2014-04-22 | 2014-07-16 | 麦格纳（太仓）汽车科技有限公司 | Method for detecting LED constant current driving circuit performance |
| CN103926500B (en) * | 2014-04-22 | 2016-08-24 | 麦格纳（太仓）汽车科技有限公司 | The method realizing the detection of constant current driver circuit for LED performance |
| CN110646746A (en) * | 2019-09-29 | 2020-01-03 | 安徽江淮汽车集团股份有限公司 | Power supply driving fault test system and method |
| CN116761300A (en) * | 2023-08-17 | 2023-09-15 | 深圳莱福德科技股份有限公司 | Abnormality detection method based on multi-signal analysis and application of abnormality detection method in lighting system |
| CN116761300B (en) * | 2023-08-17 | 2023-11-03 | 深圳莱福德科技股份有限公司 | Abnormality detection method based on multi-signal analysis and application of abnormality detection method in lighting system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101124 |
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| CX01 | Expiry of patent term |