CN103384426A - LED dimming circuit and LED lamp - Google Patents
LED dimming circuit and LED lamp Download PDFInfo
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- CN103384426A CN103384426A CN2012101334621A CN201210133462A CN103384426A CN 103384426 A CN103384426 A CN 103384426A CN 2012101334621 A CN2012101334621 A CN 2012101334621A CN 201210133462 A CN201210133462 A CN 201210133462A CN 103384426 A CN103384426 A CN 103384426A
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- voltage stabilizing
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- control chip
- circuit
- led load
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Abstract
The invention discloses an LED dimming circuit which comprises an adjusting control module and a voltage stabilizing module. The adjusting control module comprises a current detecting potentiometer which is connected with an LED loader and used for adjusting the brightness of the LED loader. The voltage stabilizing module comprises a voltage comparer U1 and a voltage stabilizing control chip U2, wherein the normal phase input end of the voltage comparer U1 is connected with the current detecting potentiometer, the output end of the voltage comparer U1 is connected with the voltage stabilizing control chip U2 to be used for feeding adjustment of the current detecting potentiometer back to the LED loader through the voltage stabilizing control chip U2, and the voltage stabilizing control chip U2 is used for adjusting and stabilizing voltage at the two ends of the LED loader according to the electrical level of the output end of the voltage comparer U1. The invention further discloses an LED lamp. The LED dimming circuit can stably adjust the brightness of the LED loader, meets various requirements of people, guarantees that a light source is stable and free of flickering when being adjusted, reduces energy loss caused by resistance heating and improves energy utilization rate.
Description
Technical field
The present invention relates to lighting field, relate in particular to a kind of LED light adjusting circuit and LED light fixture.
Background technology
LED has energy-saving and environmental protection, efficient characteristics as new type light source, has been widely used in each lighting field at present.Existing most of LED light fixture can not brightness adjusting, and usually can only arrange when dispatching from the factory one grade or two grades of brightness are thrown light on, and can not satisfy the diversified lighting demand of people.And small part can brightness adjusting the LED light fixture, light adjusting circuit is complicated, in circuit, useless power consumption is excessive, is unfavorable for effective use of energy sources.
Summary of the invention
Technical problem to be solved by this invention is, a kind of LED light adjusting circuit and LED light fixture are provided.Can satisfy the diversified lighting demand of people, improve energy utilization rate.
In order to solve the problems of the technologies described above, on the one hand, embodiments of the invention provide a kind of LED light adjusting circuit, comprising: regulate control module, Voltage stabilizing module; Described adjusting control module comprises the current detecting potentiometer, and described current detecting potentiometer is connected with the LED load, is used for regulating the brightness of described LED load; Described Voltage stabilizing module comprises voltage comparator U1, voltage stabilizing control chip U2, the normal phase input end of described voltage comparator U1 is connected with described current detecting potentiometer, output is connected with described voltage stabilizing control chip U2, is used for the adjusting of described current detecting potentiometer is fed back to the LED load by described voltage stabilizing control chip U2; Described voltage stabilizing control chip U2 is used for according to the level adjustment of described voltage comparator U1 output and stablizes the voltage at described LED load two ends.
Described adjusting control module also comprises: the first switching tube Q2, be connected with described current detecting potentiometer, and be used for controlling the light on and off of LED load.
The feedback pin FB of described voltage stabilizing control chip U2 is connected with the output of described voltage comparator U1, and the driving pin DR of described voltage stabilizing control chip U2 is connected with described LED load; When the level at described feedback pin FB place was high, the level of described driving pin DR output was low; When the level at described feedback pin FB place was low, the level of described driving pin DR output was high.
Described Voltage stabilizing module also comprises: second switch pipe Q1, the driving pin DR of described voltage stabilizing control chip is connected with described LED load by described second switch Q1.
Voltage stabilizing module also comprises: energy storage inductor L3, described energy storage inductor L3 are connected between the power supply input pin and described second switch pipe Q1 of described voltage stabilizing control chip, are used for regulating according to the on off operating mode of second switch pipe Q1 the voltage at described LED load two ends.
Described voltage stabilizing control chip is the LM3478 chip.
Described circuit also comprises the fuse F2 for the protection of described LED load, is connected between described LED load and described energy storage inductor L3.
The inverting input of described voltage comparator passes through resistance R 43 ground connection, and is connected with the output of described voltage comparator by a capacitor C 33.
Described voltage comparator is the LM2904A comparator.
On the other hand, embodiments of the invention provide a kind of LED light fixture, comprise above-mentioned LED light adjusting circuit and the LED load that is connected with described LED light adjusting circuit.
The embodiment of the present invention has following advantage or beneficial effect: feed back to by the resistance of regulating RP1 the brightness that voltage comparator U1 and voltage stabilizing control chip U2 regulate the LED load, can realize the linear regulation of LED load brightness, the larger defective of energy loss when having avoided only adopting potentiometer to regulate LED load brightness; Simultaneously, stablize the voltage at LED load two ends by Voltage stabilizing module, guarantee in adjustment process, the LED load can not glimmered by stabilized illumination.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of LED light adjusting circuit in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Below with reference to accompanying drawing, embodiments of the invention are described.Referring to Fig. 1, be the structural representation of a kind of embodiment of LED light adjusting circuit of the present invention.
Wherein, the LED light adjusting circuit comprises regulates control module 11, Voltage stabilizing module 12, regulates control module 11 and comprises current detecting potentiometer RP1, and current detecting potentiometer RP1 is connected with the LED load, is used for regulating the brightness of LED load.Voltage stabilizing module 12 comprises voltage comparator U1, voltage stabilizing control chip U2, and the normal phase input end 5 of voltage comparator U1 is connected with current detecting potentiometer RP1, also is connected with the LED load, particularly, is connected with the negative electrode of LED load; The output 7 of voltage comparator U1 is connected with voltage stabilizing control chip U2, and voltage stabilizing control chip U2 is used for regulating and the magnitude of voltage at stable LED load two ends according to the level of the output output of voltage comparator U1.Particularly, when being high, voltage stabilizing control chip U2 controls the voltage that reduces LED load two ends when the level of voltage comparator U1 output 7, thereby guaranteeing when reducing the brightness of LED load that its light is stable does not glimmer.
Because the variation with current detecting potentiometer RP1 place in circuit resistance feeds back to the brightness that voltage comparator U1 and voltage stabilizing control chip U2 regulate the LED load, can reduce significantly the resistance of current detecting potentiometer RP1, thereby reduced the electric energy of wasting because of heating in the circuit, improved energy utilization rate.
In one embodiment, voltage stabilizing control chip U2 is the LM3478 chip, Voltage stabilizing module also comprises energy storage inductor L3, and energy storage inductor L3 one end is connected to the power supply input pin of voltage stabilizing control chip U2, and the other end is connected with source electrode (or drain electrode) and the anode of LED load of switching tube Q1.Energy storage inductor is used for stablizing the voltage at its two ends when the LED load current reduces, and guarantees that the light of LED load is stable.
The power supply input pin Vin of voltage stabilizing control chip U2 is connected with DC power supplier Vcc, frequency is adjusted pin FA by resistance R 27 ground connection, its compensation pin COMP is connected with its analogue ground pin AGND and ground connection by resistance R 26, the capacitor C 25 of series connection, and its current detecting input pin ISEN is connected with the drain electrode (or source electrode) of second switch pipe Q1.
The feedback pin FB of voltage stabilizing control chip U2 is connected with the output 7 of voltage comparator U1 by diode D14, and the output 7 of voltage comparator U1 connects the anode of diode D14.The output 7 of voltage comparator U1 also is connected with its inverting input by capacitor C 33, in addition, also is connected with resistance R 44 between the negative electrode of diode D14 and voltage comparator U1.
Further, regulate control module 11 and also comprise the first switching tube Q2, this first switching tube Q2 is the P channel MOS tube, its source electrode (or drain electrode) is connected with current detecting potentiometer RP1, grid is by resistance R 17 ground connection, be connected its drain electrode (or source electrode) ground connection with DC power supply Vcc by resistance R 32.The first switching tube Q2 is used for controlling the light on and off of LED load, and when guaranteeing the power supply disconnection, the LED load can in time be extinguished, and when power supply connects, the LED load can in time be lighted.
In addition, be connected with fuse F2 between the anode of LED load and DC power supply VCC, burn to prevent that in circuit, electric current is crossed senior general LED load.
The invention also discloses a kind of LED light fixture, comprise above-mentioned LED light adjusting circuit and LED load, can realize the linear regulation of lamp brightness, and guarantee light fixture stabilized illumination in the light modulation process.
during to the sliding contact of adjusted current detecting potentiometer RP1, the resistance of potentiometer RP1 place in circuit diminishes, according to voltage divider principle, lower voltage on current detecting potentiometer RP1, the lower voltage of voltage comparator U1 normal phase input end, when its value during lower than the reference voltage of inverting input, output 7 output low levels of voltage comparator U1, the feedback pin 3 of voltage stabilizing control chip U2 is low level, thereby it drives pin 6 output high level, second switch pipe Q1 conducting, energy storage on inductance L 3 increases, thereby the electric current that makes the LED load of flowing through becomes large, its brightness is uprised.
When regulating the sliding contact of current detecting potentiometer RP1 downwards, it is large that the resistance of potentiometer RP1 place in circuit becomes, according to voltage divider principle, pressure drop on current detecting potentiometer RP1 raises, the voltage of voltage comparator U1 normal phase input end raises, when its value during higher than the reference voltage of inverting input, the output 7 output high level of voltage comparator U1, the feedback pin 3 of voltage stabilizing control chip U2 is high level, it drives pin 6 output low levels, and second switch pipe Q2 turn-offs, and the energy storage on inductance L 3 reduces, thereby the electric current of the LED load of flowing through is diminished, make its brightness step-down.
Need to prove, the resistance of the potentiometer RP1 that adopts in the embodiment of the present invention is less, even the electric current in circuit becomes the power consumption that also can not increase more greatly on RP1, with respect to only adopting potentiometer to regulate the situation of LED load brightness, save electric weight, improved effective utilization rate of energy.Note: when only adopting potentiometer to regulate LED load brightness, require the resistance of potentiometer larger, its caloric value is larger.
Embodiments of the invention feed back to by the resistance of regulating RP1 the brightness that voltage comparator U1 and voltage stabilizing control chip U2 regulate the LED load, can realize the linear regulation of LED load brightness, the larger defective of energy loss when having avoided only adopting potentiometer to regulate LED load brightness; Simultaneously, stablize the voltage at LED load two ends by Voltage stabilizing module, guarantee in adjustment process, the LED load can not glimmered by stabilized illumination.
Above-described execution mode does not consist of the restriction to this technical scheme protection range.Any at above-mentioned execution mode spirit and principle within do modification, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (10)
1. a LED light adjusting circuit, is characterized in that, comprising: regulate control module, Voltage stabilizing module;
Described adjusting control module comprises for the current detecting potentiometer of regulating LED load brightness;
Described Voltage stabilizing module comprise for the adjusting of described current detecting potentiometer by described voltage stabilizing control chip U2 feed back to the LED load voltage comparator U1, be used for according to the level adjustment of described voltage comparator U1 output and stablize the voltage stabilizing control chip U2 of described LED load both end voltage, the normal phase input end of described voltage comparator U1 is connected with described current detecting potentiometer, output and described voltage stabilizing control chip U2 brace.
2. circuit as claimed in claim 1, is characterized in that, described adjusting control module also comprises:
Be used for controlling the first switching tube Q2 of LED load light on and off, be connected with described current detecting potentiometer.
3. circuit as claimed in claim 1 or 2, is characterized in that,
The feedback pin FB of described voltage stabilizing control chip U2 is connected with the output of described voltage comparator U1, and the driving pin DR of described voltage stabilizing control chip U2 is connected with described LED load;
When the level at described feedback pin FB place was high, the level of described driving pin DR output was low; When the level at described feedback pin FB place was low, the level of described driving pin DR output was high.
4. circuit as claimed in claim 3, is characterized in that, described Voltage stabilizing module also comprises:
Second switch pipe Q1, the driving pin DR of described voltage stabilizing control chip is connected with described LED load by described second switch Q1.
5. circuit as claimed in claim 4, is characterized in that, Voltage stabilizing module also comprises:
Be used for regulating according to the on off operating mode of second switch pipe Q1 the energy storage inductor L3 of described LED load both end voltage, described energy storage inductor L3 is connected between the power supply input pin and described second switch pipe Q1 of described voltage stabilizing control chip.
6. circuit as claimed in claim 5, is characterized in that, described voltage stabilizing control chip is the LM3478 chip.
7. circuit as claimed in claim 1, is characterized in that, described circuit also comprises the fuse F2 for the protection of described LED load, is connected between described LED load and described energy storage inductor L3.
8. circuit as claimed in claim 1, is characterized in that, the inverting input of described voltage comparator passes through resistance R 43 ground connection, and be connected with the output of described voltage comparator by a capacitor C 33.
9. circuit as described in claim 1 or 8, is characterized in that, described voltage comparator is the LM2904A comparator.
10. a LED light fixture, is characterized in that, comprise LED light adjusting circuit as described in claim 1-9 any one and with as described in the LED load that is connected of LED light adjusting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101334621A CN103384426A (en) | 2012-05-02 | 2012-05-02 | LED dimming circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101334621A CN103384426A (en) | 2012-05-02 | 2012-05-02 | LED dimming circuit and LED lamp |
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| Publication Number | Publication Date |
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| CN103384426A true CN103384426A (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101334621A Pending CN103384426A (en) | 2012-05-02 | 2012-05-02 | LED dimming circuit and LED lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104640299A (en) * | 2013-11-13 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Illumination circuit and lamp |
| CN108132407A (en) * | 2017-12-13 | 2018-06-08 | 国网山东省电力公司枣庄供电公司 | Core aligning device for cables and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2816574Y (en) * | 2005-09-23 | 2006-09-13 | 程力 | Light-regulation desk lamp |
| CN201467512U (en) * | 2009-06-05 | 2010-05-12 | 华润矽威科技（上海）有限公司 | Light emitting diode (LED) illumination driving device for vehicles and ships |
| US20110204821A1 (en) * | 2004-03-19 | 2011-08-25 | Fred Holmes | Omni voltage direct current power supply |
-
2012
- 2012-05-02 CN CN2012101334621A patent/CN103384426A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110204821A1 (en) * | 2004-03-19 | 2011-08-25 | Fred Holmes | Omni voltage direct current power supply |
| CN2816574Y (en) * | 2005-09-23 | 2006-09-13 | 程力 | Light-regulation desk lamp |
| CN201467512U (en) * | 2009-06-05 | 2010-05-12 | 华润矽威科技（上海）有限公司 | Light emitting diode (LED) illumination driving device for vehicles and ships |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104640299A (en) * | 2013-11-13 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Illumination circuit and lamp |
| CN104640299B (en) * | 2013-11-13 | 2019-04-16 | 深圳市海洋王照明工程有限公司 | A kind of lighting circuit and lamps and lanterns |
| CN108132407A (en) * | 2017-12-13 | 2018-06-08 | 国网山东省电力公司枣庄供电公司 | Core aligning device for cables and method |
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Application publication date: 20131106 |