CN104780641A - Lighting drive circuit - Google Patents
Lighting drive circuit Download PDFInfo
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- CN104780641A CN104780641A CN201410013452.3A CN201410013452A CN104780641A CN 104780641 A CN104780641 A CN 104780641A CN 201410013452 A CN201410013452 A CN 201410013452A CN 104780641 A CN104780641 A CN 104780641A
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Abstract
An embodiment of the invention discloses a lighting drive circuit comprising an LED drive module, an LED lamp, a photosensitive switching triode, a sampling resistor, a voltage stabilizing diode, a comparator, and a one-way silicon controlled rectifier. The LED drive module is connected with the LED lamp; a VCC end of the LED drive module is connected to the positive pole of a power supply; a GND end of the LED drive module is connected with the anode of the one-way silicon controlled rectifier; the cathode of the one-way silicon controlled rectifier is connected to the negative pole of the power supply; the emitter of the photosensitive switching triode is connected to the positive pole of the power supply; the collector of the photosensitive switching triode is connected with a first input end, a second input end and a power input end of the comparator; the first input end of the comparator is connected with one end of the sampling resistor; the other end of the sampling resistor is connected to the negative pole of the power supply; the second input end of the comparator is connected with the cathode of the voltage stabilizing diode; the anode of the voltage stabilizing diode is connected to the negative pole of the power supply; and an output end of the comparator is connected with a control end of the one-way silicon controlled rectifier. By adopting the lighting drive circuit of the invention, the LED lamp can be turned on and off through a light control function, and when the power supply is under-voltage, the LED lamp can be turned off to implement under-voltage protection.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of illumination driving circuit.
Background technology
Along with the development of electronic technology, the requirement of user to lighting apparatus is more and more higher.Wherein, energy-conservation, intelligent, safety has become three principal elements of evaluation lighting apparatus quality.But, in existing Intelligent lamp, such as light-operated lamp, its illumination driving circuit often more complicated; relative power consumption is large, and meanwhile, complicated drive circuit does not carry out under-voltage protection to power supply; light then cause illumination flicker or dim, heavy then damage circuit, cause potential safety hazard.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, a kind of illumination driving circuit is provided, the switch controlling LED according to extraneous intensity of illumination can be realized, reach the object of low-carbon energy-saving, and LED can be closed in line under-voltage situation, thus improve the fail safe of circuit.
In order to solve the problems of the technologies described above, embodiments provide a kind of illumination driving circuit, comprise LED drive module, LED, photosensitive switch triode, sampling resistor, voltage stabilizing didoe, comparator and one-way SCR, wherein:
Described LED drive module is connected with described LED, the VCC termination of described LED drive module enters positive source, the GND end of described LED drive module is connected with the anode of described one-way SCR, the negative electrode access power cathode of described one-way SCR, the emitter access positive source of described photosensitive switch triode, the collector electrode of described photosensitive switch triode and the first input end of described comparator, second input and power input are connected, the first input end of described comparator is connected with one end of described sampling resistor, the other end access power cathode of described sampling resistor, second input of described comparator is connected with described voltage stabilizing didoe negative electrode, the anode access power cathode of described voltage stabilizing didoe, the output of described comparator is connected with the control end of described one-way SCR.
Implement the embodiment of the present invention, there is following beneficial effect: the embodiment of the present invention utilizes photosensitive switch triode to control the switch of LED according to extraneous intensity of illumination, reach the object of low-carbon energy-saving, simultaneously when photosensitive switch triode ON, gather supply voltage by sampling resistor, and then judge that whether power supply is under-voltage by comparator, close LED when line under-voltage, thus improve the fail safe of circuit, and whole circuit has simple and reliable feature.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of a kind of illumination driving circuit that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The illumination driving circuit that the embodiment of the present invention provides is mainly used in LED lighting field, such as LED street lamp, LED desk lamp and LED torch etc.
Fig. 1 is the circuit theory diagrams of a kind of illumination driving circuit that the embodiment of the present invention provides.Illumination driving circuit as shown in the figure in the embodiment of the present invention at least can comprise LED drive module, LED, photosensitive switch triode, sampling resistor, voltage stabilizing didoe, comparator and one-way SCR, wherein:
LED drive module is connected with LED, the VCC termination of LED drive module enters positive source, the GND end of LED drive module is connected with the anode of one-way SCR, the negative electrode access power cathode of one-way SCR, the emitter access positive source of photosensitive switch triode, the collector electrode of photosensitive switch triode and the first input end of comparator, second input and power input are connected, the first input end of comparator is connected with one end of sampling resistor, the other end access power cathode of sampling resistor, second input of comparator is connected with voltage stabilizing didoe negative electrode, the anode access power cathode of voltage stabilizing didoe, the output of comparator is connected with the control end of one-way SCR.
Optionally, illumination driving circuit also comprises potentiometer, wherein, the collector electrode of photosensitive switch triode is connected with the first input end of comparator by potentiometer, concrete, the collector electrode of photosensitive switch triode is connected with one end of potentiometer, and the other end of potentiometer is connected with the first input end of comparator.
Optionally, illumination driving circuit also comprises diode and current-limiting resistance, and the negative electrode access power cathode of diode, the anode of diode is connected with current-limiting resistance one end, and the other end of current-limiting resistance is connected with the output of comparator.
Further, the LED drive module in illumination driving circuit can be LED drive chip or LED drive circuit.
Refer to Fig. 1, in the embodiment of the present invention, LED is LED, and phototriode is Q2, and sampling resistor is R2, and voltage stabilizing didoe is D1, and comparator is Q3, and one-way SCR is Q1, and potentiometer is RP, and diode is D2.It is pointed out that, except above-mentioned necessary components and parts, illumination driving circuit also comprises resistance R1 and resistance R3.
In specific implementation process, photosensitive switch triode Q2 can change self on off operating mode according to the intensity of illumination of surrounding environment.Concrete, on the one hand, when the intensity of illumination that photosensitive switch triode Q2 is subject to exceedes intensity threshold, phototriode Q2 turns off, comparator Q3 cannot work on power, and then the output no-output of comparator Q3, and one-way SCR Q1 turns off, thus LED drive module does not work on power, LED is not luminous.Therefore the present invention when environment illumination intensity is large around, can closes LED, reaches low-carbon (LC), energy-conservation effect.
On the other hand, when the intensity of illumination that photosensitive switch triode Q2 is subject to does not exceed intensity threshold, phototriode Q2 conducting, described comparator Q3 works on power.
Further, during the Q2 conducting of photosensitive switch triode, voltage is added on sampling resistor R2 by potentiometer RP by positive source, and is added on voltage stabilizing didoe D1 by resistance R1 by voltage, and the voltage stabilization of voltage stabilizing didoe D1 negative electrode is on clamp voltage.Positive source voltage is larger, then the voltage on sampling resistor R2 is larger, otherwise less.Specify in embodiments of the present invention: when the voltage on sampling resistor R2 is greater than the cathode voltage of voltage stabilizing didoe D1, then positive source is greater than predetermined voltage threshold, otherwise is then less than predetermined voltage threshold.So:
If positive source voltage is greater than predetermined voltage threshold, namely the voltage of sampling resistor R2 one end is greater than the clamp voltage of the negative electrode of voltage stabilizing didoe D1, and then the voltage of the first input end of comparator Q3 is higher than the voltage of the second input, from comparator Q3 operation principle, now comparator Q3 exports high level, and the control end of one-way SCR Q1 receives high level, thus one-way SCR Q1 conducting, LED drive module works on power, and described LED is luminous;
If positive source voltage is less than predetermined voltage threshold, namely the voltage of sampling resistor R2 one end is less than the clamp voltage of the negative electrode of voltage stabilizing didoe D1, and then the voltage of the first input end of comparator Q3 is lower than the voltage of the second input, from comparator Q3 operation principle, now comparator Q3 output low level, the control end of one-way SCR Q1 receives low level, thus one-way SCR Q1 turns off, LED drive module does not work on power, and LED is not luminous.
Therefore the present invention can when supply voltage be in under-voltage condition, and turn off LED, protective circuit safety, improves Consumer's Experience simultaneously.
Optionally, illumination driving circuit can determine above-mentioned predetermined voltage threshold according to the resistance of potentiometer RP.Concrete, the resistance of potentiometer RP is larger, then the dividing potential drop of potentiometer RP is larger, and then the voltage that sampling resistor R2 divides is less, and then the voltage of the first input end of comparator Q3 is less, according to the above-mentioned regulation to predetermined voltage threshold, predetermined voltage threshold is larger.Otherwise the resistance of potentiometer RP is less, then the dividing potential drop of potentiometer RP is less, and then the voltage of sampling resistor R2 one end is larger, and then the voltage of the first input end of comparator Q3 is larger, according to the above-mentioned regulation to predetermined voltage threshold, predetermined voltage threshold is less.
Another optional, illumination driving circuit can determine predetermined voltage threshold according to the reverse breakdown voltage value of voltage stabilizing didoe D1.Wherein, its reverse breakdown voltage value of the voltage stabilizing didoe of different size is different, and when non-reverse breakdown, the clamped voltage value of voltage stabilizing didoe equals reverse breakdown voltage value.Concrete, the reverse breakdown voltage value of voltage stabilizing didoe D1 is larger, then the clamp voltage of the negative electrode of voltage stabilizing didoe D1 is larger, and then the voltage of second input of comparator Q3 is larger, according to the above-mentioned regulation to predetermined voltage threshold, predetermined voltage threshold is larger.Otherwise the reverse breakdown voltage value of voltage stabilizing didoe D1 is less, then the clamp voltage of the negative electrode of voltage stabilizing didoe D1 is less, and then the voltage of second input of comparator Q3 is less, and according to the above-mentioned regulation to predetermined voltage threshold, predetermined voltage threshold is less.
It is pointed out that by above-mentioned two optional modes, can regulate predetermined voltage threshold.In embodiments of the present invention, preferably, predetermined voltage threshold can be set as 12V.
The embodiment of the present invention utilizes photosensitive switch triode to control the switch of LED according to extraneous intensity of illumination, reach the object of low-carbon energy-saving, simultaneously when photosensitive switch triode ON, supply voltage is gathered by sampling resistor, and then judge that whether power supply is under-voltage by comparator, close LED when line under-voltage, thus improve the fail safe of circuit, and whole circuit has simple and reliable feature.
The concrete enforcement principle of the above circuit, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved components and parts or module might not be that the present invention is necessary.
Claims (10)
1. an illumination driving circuit, is characterized in that, described illumination driving circuit comprises LED drive module, LED, photosensitive switch triode, sampling resistor, voltage stabilizing didoe, comparator and one-way SCR, wherein:
Described LED drive module is connected with described LED, the VCC termination of described LED drive module enters positive source, the GND end of described LED drive module is connected with the anode of described one-way SCR, the negative electrode access power cathode of described one-way SCR, the emitter access positive source of described photosensitive switch triode, the collector electrode of described photosensitive switch triode and the first input end of described comparator, second input and power input are connected, the first input end of described comparator is connected with one end of described sampling resistor, the other end access power cathode of described sampling resistor, second input of described comparator is connected with described voltage stabilizing didoe negative electrode, the anode access power cathode of described voltage stabilizing didoe, the output of described comparator is connected with the control end of described one-way SCR.
2. illumination driving circuit as claimed in claim 1, it is characterized in that, when the intensity of illumination that described photosensitive switch triode is subject to exceedes intensity threshold, described phototriode turns off, described comparator does not work on power, and then the output no-output of described comparator, and described one-way SCR turns off, thus described LED drive module does not work on power, described LED is not luminous.
3. illumination driving circuit as claimed in claim 1, is characterized in that, when the intensity of illumination that described photosensitive switch triode is subject to does not exceed intensity threshold, and described phototriode conducting, described comparator works on power, wherein:
If described positive source voltage is greater than predetermined voltage threshold, then the voltage of one end of described sampling resistor is greater than the clamp voltage of the negative electrode of described voltage stabilizing didoe, namely the voltage of the first input end of described comparator is higher than the voltage of the second input, and then described comparator exports high level, the control end of described one-way SCR receives high level, thus described one-way SCR conducting, described LED drive module works on power, and described LED is luminous;
If described positive source voltage is less than predetermined voltage threshold, then the voltage of one end of described sampling resistor is less than the clamp voltage of the negative electrode of described voltage stabilizing didoe, namely the voltage of the first input end of described comparator is less than the voltage of the second input, and then described comparator output low level, the control end of described one-way SCR receives low level, thus described one-way SCR turns off, described LED drive module does not work on power, and described LED is not luminous.
4. illumination driving circuit as claimed in claim 3, it is characterized in that, described illumination driving circuit also comprises potentiometer, wherein,
The collector electrode of described photosensitive switch triode is connected with the first input end of described comparator and comprises:
The collector electrode of described photosensitive switch triode is connected with one end of described potentiometer, and the other end of described potentiometer is connected with the first input end of described comparator.
5. illumination driving circuit as claimed in claim 4, is characterized in that, determine described predetermined voltage threshold according to the resistance of described potentiometer.
6. illumination driving circuit as claimed in claim 5, it is characterized in that, the resistance of described potentiometer is larger, then the dividing potential drop of described potentiometer is larger, and then the voltage of one end of described sampling resistor is less, and then the voltage of the first input end of described comparator is less, thus described predetermined voltage threshold is larger;
The resistance of described potentiometer is less, then the dividing potential drop of described potentiometer is less, and then the voltage of one end of described sampling resistor is larger, and then the voltage of the first input end of described comparator is larger, thus described predetermined voltage threshold is less.
7. illumination driving circuit as claimed in claim 3, it is characterized in that, the reverse breakdown voltage value according to described voltage stabilizing didoe determines described predetermined voltage threshold.
8. illumination driving circuit as claimed in claim 7, it is characterized in that, the reverse breakdown voltage value of described voltage stabilizing didoe is larger, then the clamp voltage of the negative electrode of described voltage stabilizing didoe is larger, and then the voltage of the second input of described comparator is larger, thus described predetermined voltage threshold is larger;
The reverse breakdown voltage value of described voltage stabilizing didoe is less, then the clamp voltage of the negative electrode of described voltage stabilizing didoe is less, and then the voltage of the second input of described comparator is less, thus described predetermined voltage threshold is less.
9. illumination driving circuit as claimed in claim 1, it is characterized in that, described illumination driving circuit also comprises diode and current-limiting resistance, the negative electrode access power cathode of described diode, the anode of described diode is connected with described current-limiting resistance one end, and the other end of described current-limiting resistance is connected with the output of described comparator.
10. illumination driving circuit as claimed in claim 1, it is characterized in that, described LED drive module comprises LED drive chip or LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013452.3A CN104780641A (en) | 2014-01-10 | 2014-01-10 | Lighting drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013452.3A CN104780641A (en) | 2014-01-10 | 2014-01-10 | Lighting drive circuit |
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| CN104780641A true CN104780641A (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410013452.3A Pending CN104780641A (en) | 2014-01-10 | 2014-01-10 | Lighting drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963394A (en) * | 2018-07-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of flash switch detection circuit and Intelligent lamp |
| CN112533320A (en) * | 2019-08-28 | 2021-03-19 | 群光电能科技股份有限公司 | Light emitting diode control device |
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| CN201345759Y (en) * | 2008-12-19 | 2009-11-11 | 比亚迪股份有限公司 | Switch device and streetlamp |
| CN101815386A (en) * | 2010-04-30 | 2010-08-25 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| CN102209409A (en) * | 2010-03-31 | 2011-10-05 | 鸿富锦精密工业（深圳）有限公司 | Light-controlled electronic switching circuit |
| CN102421231A (en) * | 2011-09-19 | 2012-04-18 | 金陵科技学院 | Energy-saving soft start street lamp control system |
| CN202940562U (en) * | 2012-11-27 | 2013-05-15 | 成都江法科技有限公司 | Under-voltage protection alarm device |
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2014
- 2014-01-10 CN CN201410013452.3A patent/CN104780641A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201345759Y (en) * | 2008-12-19 | 2009-11-11 | 比亚迪股份有限公司 | Switch device and streetlamp |
| CN102209409A (en) * | 2010-03-31 | 2011-10-05 | 鸿富锦精密工业（深圳）有限公司 | Light-controlled electronic switching circuit |
| CN101815386A (en) * | 2010-04-30 | 2010-08-25 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| CN102421231A (en) * | 2011-09-19 | 2012-04-18 | 金陵科技学院 | Energy-saving soft start street lamp control system |
| CN202940562U (en) * | 2012-11-27 | 2013-05-15 | 成都江法科技有限公司 | Under-voltage protection alarm device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109963394A (en) * | 2018-07-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of flash switch detection circuit and Intelligent lamp |
| CN112533320A (en) * | 2019-08-28 | 2021-03-19 | 群光电能科技股份有限公司 | Light emitting diode control device |
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Application publication date: 20150715 |