CN102735987A - LED (light emitting diode) detection circuit - Google Patents
LED (light emitting diode) detection circuit Download PDFInfo
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- CN102735987A CN102735987A CN2012102447275A CN201210244727A CN102735987A CN 102735987 A CN102735987 A CN 102735987A CN 2012102447275 A CN2012102447275 A CN 2012102447275A CN 201210244727 A CN201210244727 A CN 201210244727A CN 102735987 A CN102735987 A CN 102735987A
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Abstract
The invention provides an LED (light emitting diode) detection circuit, comprising a first resistor and a voltage obtaining unit, wherein the first resistor is connected with an LED lamp in series, and the voltage obtaining unit is connected with the first resistor in parallel; when the LED lamp is switched on, voltage values of two ends of the first resistor are first voltage values; when the LED lamp is switched off, the voltage values of the two ends of the first resistor are second voltage values; the voltage obtaining unit is used for detecting the voltage values of the two ends of the first resistor; and when the detected voltage values of the two ends of the first resistor are converted from the first voltage values to the second voltage values, an alarming signal is generated. According to the LED detection circuit disclosed by the invention, the detection circuit is connected with the LED lamp in series, a user can independently select a lamp tool, the detection circuit is not limited by the type of the lamp tool and can be used for detecting whether any one lamp tool is of power failure or not, and the flexibility of the application of the lamp tool is improved.
Description
Technical field
The present invention relates to the testing circuit technical field, relate to a kind of LED testing circuit in particular.
Background technology
Brightness height, color category are abundant because LED lamp (Light Emitting Diode, light emitting diode) has, low-power consumption, long characteristics of life-span, so the LED lamp is widely used in automotive field.The LED car light is meant and adopts the car light of LED lamp as light source, in order to ensure motor vehicles external LED car light complete effectively, should in time detect the situation of falling lamp of LED car light.
The mode of falling lamp of detection LED car light commonly used is: the light fixture of selecting to specify on the automobile band self diagnosis of usefulness; Also be; Integrated circuit joins in the LED car light driving circuit; Constitute the light fixture with constant current function, the current source circuit that adopts integrated circuit to constitute provides working current for the LED car light, and then detects.
On automobile, can only select to specify the light fixture of the band self diagnosis of usefulness, and can not select the light fixture of other types for use, the dirigibility that light fixture uses is not high.
Summary of the invention
In view of this, the present invention provides a kind of LED testing circuit, in order to solving the light fixture of the band self diagnosis on automobile, can only select to specify usefulness, and can not select the light fixture of other types for use, the not high problem of dirigibility that light fixture uses.
A kind of LED testing circuit comprises first resistance of connecting with the LED lamp, and the voltage acquiring unit parallelly connected with said first resistance;
When said LED lamp path, the magnitude of voltage at the said first resistance two ends is first magnitude of voltage;
When said LED lamp opened circuit, the magnitude of voltage at the said first resistance two ends was second magnitude of voltage;
Said voltage acquiring unit detects the magnitude of voltage at the said first resistance two ends, when the magnitude of voltage that detects the said first resistance two ends is become said second magnitude of voltage by said first magnitude of voltage, generates alerting signal.
Preferably, in above-mentioned LED testing circuit, said voltage acquiring unit is an operational amplifier;
The inverting input of said operational amplifier is connected with first end of said first resistance, and the normal phase input end of said operational amplifier is connected with second end of said first resistance;
When the magnitude of voltage at the said first resistance two ends was become said second magnitude of voltage by said first magnitude of voltage, said operational amplifier generated high level signal, reports to the police to drive warning device.
Preferably, in above-mentioned LED testing circuit, also comprise: second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance;
Said first resistance is connected with external power supply through said second resistance;
The inverting input of said operational amplifier is connected with first end of said first resistance through said the 3rd resistance;
The normal phase input end of said operational amplifier is connected with second end of said first resistance through said the 4th resistance;
First end of said the 6th resistance is connected with the output terminal of said operational amplifier, and second end is the output terminal of LED testing circuit;
The inverting input of said operational amplifier is connected with first end of said the 6th resistance through said the 5th resistance.
Can know that via above-mentioned technical scheme testing circuit of the present invention is connected with the LED lamp, that is to say; The user can independently select light fixture; Testing circuit of the present invention is not limited to the type of light fixture, and it can detect the whether power down of any one light fixture, has increased the dirigibility that light fixture uses.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, below+accompanying drawing in describing only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
A kind of structural representation of the LED testing circuit that Fig. 1 provides for the embodiment of the invention;
Another structural representation of the LED testing circuit that Fig. 2 provides for the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
At present; What use always on the automobile is the LED light fixture that has diagnostic function, and also promptly, current source diagnostic circuit and LED lamp that integrated chip constitutes integrate; The user has only the supporting light fixture of buying appointment that diagnostic function is just arranged; The common LED lamp of oneself changing does not have diagnostic function, and the user can not change light fixture arbitrarily, and the dirigibility that light fixture uses is not high.
The embodiment of the invention provides a kind of circuit with diagnostic function, and the user can independently select light fixture and unrestricted, has increased the dirigibility that light fixture uses.
With reference to figure 1, show a kind of structural representation of LED testing circuit.
A kind of LED testing circuit comprises:
First resistance R 1 of connecting, and the voltage acquiring unit parallelly connected with first resistance R 1 with the LED lamp;
When LED lamp path, the magnitude of voltage at first resistance R, 1 two ends is first magnitude of voltage;
When the LED lamp opened circuit, the magnitude of voltage at first resistance R, 1 two ends was second magnitude of voltage;
The voltage acquiring unit detects the magnitude of voltage at first resistance R, 1 two ends, when the magnitude of voltage that detects first resistance R, 1 two ends becomes second magnitude of voltage by first magnitude of voltage, generates alerting signal.
The LED testing circuit can be integrated in the controller, and testing circuit is connected with the LED lamp.
Concrete, when the LED lamp operate as normal on the automobile, R1, D1 circuit lead at this moment, owing to there is electric current to flow through R1, then produce pressure drop at the R1 two ends, and the magnitude of voltage at first resistance R, 1 two ends is the first magnitude of voltage U1.
On the contrary, if when the LED lamp on the automobile has the lamp of falling situation to take place, this moment R1, D1 circuit breaker owing to there is not electric current to flow through R1, then the R1 two ends can not produce pressure drop, the magnitude of voltage at first resistance R, 1 two ends is the second magnitude of voltage U2, the U2 of this moment is 0.
Duty when from the above, the variation of first resistance R, 1 voltage value can be distinguished lamp and not fall lamp.The voltage acquiring unit detects the magnitude of voltage at first resistance R, 1 two ends, when the magnitude of voltage that detects first resistance R, 1 two ends becomes second magnitude of voltage 0 by the first magnitude of voltage U1, just generates alerting signal.
Can know that via above-mentioned technical scheme testing circuit of the present invention is connected with the LED lamp, that is to say; The user can independently select light fixture; Testing circuit of the present invention is not limited to the type of light fixture, and it can detect the whether power down of any one light fixture, has increased the dirigibility that light fixture uses.
Further, above-mentioned voltage acquiring unit can be operational amplifier.
With reference to figure 2, the inverting input of operational amplifier is connected with first end of first resistance R 1, and the normal phase input end of operational amplifier is connected with second end of first resistance R 1.Operational amplifier is connected with external power supply with earth terminal respectively, for operational amplifier provides power supply, makes the operational amplifier operate as normal.
When the magnitude of voltage at first resistance R, 1 two ends was become above-mentioned second magnitude of voltage by above-mentioned first magnitude of voltage, operational amplifier generated high level signal, reports to the police to drive warning device.
Concrete, when the LED lamp operate as normal on the automobile, the magnitude of voltage at first resistance R, 1 two ends is the first magnitude of voltage U1, the output terminal output low level of operational amplifier does not drive warning device and carries out; When the LED lamp on the automobile had the lamp of falling situation to take place, the magnitude of voltage at first resistance R, 1 two ends was the second magnitude of voltage U2, the output terminal output high level of operational amplifier, and high level signal drives warning device and reports to the police.
The operational amplifier that adopts in the LED testing circuit is compared with the current source detection LED light fixture that integrated chip constitutes, and has reduced cost.
Further with reference to figure 2, LED testing circuit of the present invention also comprises: second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6.
First resistance R 1 is connected with external power supply VCC through second resistance R 2, and the span of VCC is 18V ~ 32V.
The inverting input of operational amplifier is connected with first end of first resistance R 1 through the 3rd resistance R 3;
The normal phase input end of operational amplifier is connected with second end of first resistance R 1 through the 4th resistance R 4;
First end of the 6th resistance R 6 is connected with the output terminal of operational amplifier, and second end is the output terminal of LED testing circuit;
The inverting input of operational amplifier is connected with first end of the 6th resistance R 6 through the 5th resistance R 5.
Need to prove,, select the resistance of second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6, do not do qualification at this according to the actual conditions of LED lamp.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
At last; Also need to prove; In this article; Relational terms such as first, second grade only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (3)
1. a LED testing circuit is characterized in that, comprises first resistance of connecting with the LED lamp, and the voltage acquiring unit parallelly connected with said first resistance;
When said LED lamp path, the magnitude of voltage at the said first resistance two ends is first magnitude of voltage;
When said LED lamp opened circuit, the magnitude of voltage at the said first resistance two ends was second magnitude of voltage;
Said voltage acquiring unit detects the magnitude of voltage at the said first resistance two ends, when the magnitude of voltage that detects the said first resistance two ends is become said second magnitude of voltage by said first magnitude of voltage, generates alerting signal.
2. testing circuit according to claim 1 is characterized in that, said voltage acquiring unit is an operational amplifier;
The inverting input of said operational amplifier is connected with first end of said first resistance, and the normal phase input end of said operational amplifier is connected with second end of said first resistance;
When the magnitude of voltage at the said first resistance two ends was become said second magnitude of voltage by said first magnitude of voltage, said operational amplifier generated high level signal, reports to the police to drive warning device.
3. testing circuit according to claim 2 is characterized in that, also comprises: second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance;
Said first resistance is connected with external power supply through said second resistance;
The inverting input of said operational amplifier is connected with first end of said first resistance through said the 3rd resistance;
The normal phase input end of said operational amplifier is connected with second end of said first resistance through said the 4th resistance;
First end of said the 6th resistance is connected with the output terminal of said operational amplifier, and second end is the output terminal of LED testing circuit;
The inverting input of said operational amplifier is connected with first end of said the 6th resistance through said the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102447275A CN102735987A (en) | 2012-07-13 | 2012-07-13 | LED (light emitting diode) detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102447275A CN102735987A (en) | 2012-07-13 | 2012-07-13 | LED (light emitting diode) detection circuit |
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| CN102735987A true CN102735987A (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012102447275A Pending CN102735987A (en) | 2012-07-13 | 2012-07-13 | LED (light emitting diode) detection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604103A (en) * | 2013-12-04 | 2014-02-26 | 青岛锐晶光电科技有限公司 | LED module and recognition device and recognition method of LED module |
| CN109581248A (en) * | 2018-12-18 | 2019-04-05 | 深圳市瑞丰光电紫光技术有限公司 | A kind of dead lamp inspection slowdown monitoring circuit and warning device |
| CN110988741A (en) * | 2019-12-20 | 2020-04-10 | 深圳海致洋科技有限公司 | Full-automatic line inspection method and full-automatic line inspection instrument |
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| CN1803508A (en) * | 2006-01-24 | 2006-07-19 | 上海同铁电子科技有限公司 | LED signal lamp with digital automatic detection function |
| JP2006303093A (en) * | 2005-04-19 | 2006-11-02 | Sony Corp | Led drive |
| CN201731275U (en) * | 2010-05-24 | 2011-02-02 | 深圳尚莱特照明技术有限公司 | Intelligent light-adjusting flashlight capable of adjusting light intensity |
| CN102141583A (en) * | 2010-12-29 | 2011-08-03 | 深圳市火天光电科技有限公司 | LED current detection circuit |
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2012
- 2012-07-13 CN CN2012102447275A patent/CN102735987A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003163791A (en) * | 2001-11-27 | 2003-06-06 | Canon Inc | Image reader, light source unit, and light source control method |
| JP2006303093A (en) * | 2005-04-19 | 2006-11-02 | Sony Corp | Led drive |
| CN1803508A (en) * | 2006-01-24 | 2006-07-19 | 上海同铁电子科技有限公司 | LED signal lamp with digital automatic detection function |
| CN201731275U (en) * | 2010-05-24 | 2011-02-02 | 深圳尚莱特照明技术有限公司 | Intelligent light-adjusting flashlight capable of adjusting light intensity |
| CN102141583A (en) * | 2010-12-29 | 2011-08-03 | 深圳市火天光电科技有限公司 | LED current detection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604103A (en) * | 2013-12-04 | 2014-02-26 | 青岛锐晶光电科技有限公司 | LED module and recognition device and recognition method of LED module |
| CN109581248A (en) * | 2018-12-18 | 2019-04-05 | 深圳市瑞丰光电紫光技术有限公司 | A kind of dead lamp inspection slowdown monitoring circuit and warning device |
| CN110988741A (en) * | 2019-12-20 | 2020-04-10 | 深圳海致洋科技有限公司 | Full-automatic line inspection method and full-automatic line inspection instrument |
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Application publication date: 20121017 |