CN104768283A - Intelligent LED drive control circuit - Google Patents
Intelligent LED drive control circuit Download PDFInfo
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- CN104768283A CN104768283A CN201510092853.7A CN201510092853A CN104768283A CN 104768283 A CN104768283 A CN 104768283A CN 201510092853 A CN201510092853 A CN 201510092853A CN 104768283 A CN104768283 A CN 104768283A
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Abstract
The invention discloses an intelligent LED drive control circuit. The intelligent LED drive control circuit comprises a bridge rectifier circuit and an LED drive control circuit body. The bridge rectifier circuit is connected with a high-voltage filter capacitor, a first resistor and the LED drive control circuit body in parallel. The first resistor is connected with a second resistor in series, the second resistor is connected to the ground through a third resistor, the second resistor and the third resistor are connected with the LED drive control circuit body, the LED drive control circuit body is connected with a power tube grid electrode, and a power tube source electrode is connected to the ground through a fourth resistor. According to the intelligent LED drive control circuit, the cost of the overall scheme is low, the size is small, the structure is simple and practical, the working performance is stable and reliable, and the application range is wide.
Description
Technical field
The present invention relates to intelligent LED light adjusting circuit, particularly LED driving power technical field, specifically refer to and a kind ofly detect urban electric power switch thus realize LED Drive and Control Circuit and the driving circuit structure thereof of different output current.
Background technology
The advantages such as in recent years, LED illumination is efficient with it, energy-conservation, environmental protection, and the life-span is long obtain extensive use.In different use occasions, also different to the requirement of the brightness of LED lamp.Although current LED drive power realizes constant current output, shortcoming is that output current is fixed, cannot regulation output size of current.
Summary of the invention
The object of the present invention is to provide a kind of intelligent LED Drive and Control Circuit, the cost of its overall plan is low, and small volume is simple and practical, stable and reliable working performance, and the scope of application is comparatively extensive.
In order to achieve the above object, technical scheme of the present invention is:
A kind of intelligent LED Drive and Control Circuit, comprise bridge rectifier 300, LED Drive and Control Circuit 322, described bridge rectifier 300 respectively with high-voltage filtering capacitor 301, first resistance 302, LED drive circuit 323 is in parallel, wherein said first resistance 302 is connected with the second resistance 307, described second resistance 307 is by the 3rd resistance 310 ground connection, described second resistance 307 is connected with LED Drive and Control Circuit 322 with between the 3rd resistance 310, described LED Drive and Control Circuit 322 is connected with power tube 319 grid, described power tube 319 source electrode is by the 4th resistance 321 ground connection.
Described LED Drive and Control Circuit 322 comprises peak current detection circuit 318, electric current estimation circuit 317, logic control circuit 313, drive circuit 314, flex point testing circuit 311, described power tube 319 source class is successively by peak current detection circuit 318, electric current estimation circuit 317, logic control circuit 313, drive circuit 314 is connected with described power tube 319 grid, described electric current estimation circuit 317 is also connected by flex point testing circuit 311 and between the second resistance 307 and the 3rd resistance 310, secondary to negative pressure change-over circuit 320 between described second resistance 307 and the 3rd resistance 310, comparator 315, timer 316 andlogic control circuit 313 is connected, described peak current detection circuit 318 is responsible for the source voltage of detection power pipe 319, and real-time Transmission is to electric current estimation circuit 317, described flex point testing circuit 311 is transferred to electric current estimation circuit 317 after detecting the voltage knee between the second resistance 307 and the 3rd resistance 310, described electric current estimation circuit 317 is transferred to described logic control circuit 313 after computing, logic control circuit 313 controls the turn-on and turn-off of described power tube 319 by drive circuit 314, ensures constant output current, to tell between the second resistance 307 and the 3rd resistance 310 also successively by negative pressure change-over circuit 320, comparator 315, timer 316 to logic control circuit 313 for judging the switch of alternating current AC.
Between described first resistance 302 and the second resistance 307, diode 305 is installed, between described diode 305 and the second resistance 307, auxiliary winding 308 is installed, described first resistance 302 is connected with electric capacity 309 one end, the rear ground connection and described electric capacity 309 other end is connected with auxiliary winding 308.
Described power tube 319 drains to be coupled with the different name end of fly-wheel diode 303 and energy storage inductor 306 respectively and is connected.
Described bridge rectifier 300 is in parallel with storage capacitor 304.
Described power tube 319 is field effect transistor.
The invention has the beneficial effects as follows: a kind of intelligent LED Drive and Control Circuit, due to inside integrated AC switch decision circuitry, what energy was intelligent judges whether export AC action occurs, thus on the basis not increasing system cost, realize the adjustment of output current amplitude, there is compared with other dimming power sources the circuit structure of simple LED drive power, less LED drive power volume, lower LED drive power cost, stable and reliable working performance, the scope of application is comparatively extensive, not only may be used for non-isolation type supply convertor, isolated supplies converter or other type of converter can also be applied to.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of LED drive circuit of the present invention;
Fig. 2 is the logical signal figure of LED Drive and Control Circuit AC switch decision circuitry of the present invention.
Embodiment
Embodiment 1
A kind of intelligent LED Drive and Control Circuit as shown in Figure 1, comprise bridge rectifier 300, LED Drive and Control Circuit 322, described bridge rectifier 300 respectively with high-voltage filtering capacitor 301, first resistance 302, LED drive circuit 323 is in parallel, wherein said first resistance 302 is connected with the second resistance 307, described second resistance 307 is by the 3rd resistance 310 ground connection, described second resistance 307 is connected with LED Drive and Control Circuit 322 with between the 3rd resistance 310, described LED Drive and Control Circuit 322 is connected with power tube 319 grid, described power tube 319 source electrode is by the 4th resistance 321 ground connection.Described bridge rectifier 300 is in parallel with storage capacitor 304.
Described LED Drive and Control Circuit 322 comprises peak current detection circuit 318, electric current estimation circuit 317, logic control circuit 313, drive circuit 314, flex point testing circuit 311, described power tube 319 source class is successively by peak current detection circuit 318, electric current estimation circuit 317, logic control circuit 313, drive circuit 314 is connected with described power tube 319 grid, described electric current estimation circuit 317 is also connected by flex point testing circuit 311 and between the second resistance 307 and the 3rd resistance 310, secondary to negative pressure change-over circuit 320 between described second resistance 307 and the 3rd resistance 310, comparator 315, timer 316 andlogic control circuit 313 is connected, described peak current detection circuit 318 is responsible for the source voltage of detection power pipe 319, and real-time Transmission is to electric current estimation circuit 317, described flex point testing circuit 311 is transferred to electric current estimation circuit 317 after detecting the voltage knee between the second resistance 307 and the 3rd resistance 310, described electric current estimation circuit 317 is transferred to described logic control circuit 313 after computing, logic control circuit 313 controls the turn-on and turn-off of described power tube 319 by drive circuit 314, ensures constant output current, to tell between the second resistance 307 and the 3rd resistance 310 also successively by negative pressure change-over circuit 320, comparator 315, timer 316 to logic control circuit 313 for judging the switch of alternating current AC.
Between described first resistance 302 and the second resistance 307, diode 305 is installed, between described diode 305 and the second resistance 307, auxiliary winding 308 is installed, described first resistance 302 is connected with electric capacity 309 one end, the rear ground connection and described electric capacity 309 other end is connected with auxiliary winding 308.
Described power tube 319 drains to be coupled with the different name end of fly-wheel diode 303 and energy storage inductor 306 respectively and is connected.
Described power tube 319 is field effect transistor.
A kind of intelligent LED Drive and Control Circuit described in the present embodiment is when alternating current AC accesses, described first resistance 302 by Energy Transfer to electric capacity 309, described electric capacity 309 is responsible for powering to LED drive circuit 322, when the level on electric capacity 309 reaches the start-up point of LED drive circuit 322, drive circuit 322 is started working, control power tube 319 open-minded, energy is by LED drive circuit 323 and be stored on energy storage inductor 306, peak current detection circuit 318 gathers the level on power tube 319 source electrode, logic control circuit 313 controls drive circuit 314 makes power tube 319 turn off, energy on energy storage inductor 306 is transferred to LED drive circuit 322 by fly-wheel diode 303.When fly-wheel diode 303 conducting, the auxiliary winding 308 being coupling in energy storage inductor 306 is charged to electric capacity 309 by diode 305, and auxiliary winding 308 also arrives ground by the second resistance 307 and the 3rd resistance 310 simultaneously.Flex point testing circuit 311 detects the common port of the second resistance 307 and the 3rd resistance 310, thus calculates the ON time of fly-wheel diode 303.After the signal that electric current estimation circuit 317 gathers peak detection circuit 318 and flex point testing circuit 311 carries out computing, pass to logic control circuit 313, switch-off power pipe 319.
Alternating current AC switching circuit is when normally working as described in Figure 2, and the negative pressure be coupling on the auxiliary winding 308 on energy storage inductor 306 is:
wherein
represent the coupled relation of two windings, Vin represents the voltage of input voltage after bridge rectifier.Because auxiliary winding 308 also arrives ground by the second resistance 307 and the 3rd resistance 310, and the ZCS pin of LED drive circuit 322 connects the common port of these two resistance, and therefore the negative pressure of ZCS pin is:
When alternating current AC is closed, the energy on high-voltage filtering capacitor 301 has been consumed rapidly, and the negative pressure therefore on ZCS pin will be zero, and after negative pressure change-over circuit, the level being connected to comparator 315 positive input terminal also will be continuously zero.Comparator 315 overturns, and outputs signal to timer 316, when exceeding the spilling threshold value of timing 316, then outputs signal to logic control circuit 313.Logic control circuit 313 judges that switch occurs alternating current AC, changes turning on and off of power tube 319, output current is changed by drive circuit 314, thus changes the brightness of LED drive circuit 322.
Have employed a kind of intelligent LED Drive and Control Circuit of this invention, due to inside integrated AC switch decision circuitry, what energy was intelligent judges whether export AC action occurs, thus on the basis not increasing system cost, realize the adjustment of output current amplitude, thus simplify the circuit structure of LED drive power, reduce LED drive power volume, reduce LED drive power cost, stable and reliable working performance, the scope of application is comparatively extensive, not only may be used for non-isolation type supply convertor, isolated supplies converter or other type of converter can also be applied to.
Claims (6)
1. an intelligent LED Drive and Control Circuit, it is characterized in that: comprise bridge rectifier 300, LED Drive and Control Circuit 322, described bridge rectifier 300 respectively with high-voltage filtering capacitor 301, first resistance 302, LED drive circuit 323 is in parallel, wherein said first resistance 302 is connected with the second resistance 307, described second resistance 307 is by the 3rd resistance 310 ground connection, described second resistance 307 is connected with LED Drive and Control Circuit 322 with between the 3rd resistance 310, described LED Drive and Control Circuit 322 is connected with power tube 319 grid, described power tube 319 source electrode is by the 4th resistance 321 ground connection.
2. a kind of intelligent LED Drive and Control Circuit according to claim 1, it is characterized in that: described LED Drive and Control Circuit 322 comprises peak current detection circuit 318, electric current estimation circuit 317, logic control circuit 313, drive circuit 314, flex point testing circuit 311, described power tube 319 source class is successively by peak current detection circuit 318, electric current estimation circuit 317, logic control circuit 313, drive circuit 314 is connected with described power tube 319 grid, described electric current estimation circuit 317 is also connected by flex point testing circuit 311 and between the second resistance 307 and the 3rd resistance 310, secondary to negative pressure change-over circuit 320 between described second resistance 307 and the 3rd resistance 310, comparator 315, timer 316 andlogic control circuit 313 is connected, described peak current detection circuit 318 is responsible for the source voltage of detection power pipe 319, and real-time Transmission is to electric current estimation circuit 317, described flex point testing circuit 311 is transferred to electric current estimation circuit 317 after detecting the voltage knee between the second resistance 307 and the 3rd resistance 310, described electric current estimation circuit 317 is transferred to described logic control circuit 313 after computing, logic control circuit 313 controls the turn-on and turn-off of described power tube 319 by drive circuit 314, ensures constant output current, to tell between the second resistance 307 and the 3rd resistance 310 also successively by negative pressure change-over circuit 320, comparator 315, timer 316 to logic control circuit 313 for judging the switch of alternating current AC.
3. a kind of intelligent LED Drive and Control Circuit according to claim 1, it is characterized in that: between described first resistance 302 and the second resistance 307, diode 305 is installed, between described diode 305 and the second resistance 307, auxiliary winding 308 is installed, described first resistance 302 is connected with electric capacity 309 one end, the rear ground connection and described electric capacity 309 other end is connected with auxiliary winding 308.
4. a kind of intelligent LED Drive and Control Circuit according to claim 1, is characterized in that: described power tube 319 drains to be coupled with the different name end of fly-wheel diode 303 and energy storage inductor 306 respectively and is connected.
5. a kind of intelligent LED Drive and Control Circuit according to claim 1, is characterized in that: described bridge rectifier 300 is in parallel with storage capacitor 304.
6. a kind of intelligent LED Drive and Control Circuit according to claim 1, is characterized in that: described power tube 319 is field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510092853.7A CN104768283A (en) | 2015-03-02 | 2015-03-02 | Intelligent LED drive control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510092853.7A CN104768283A (en) | 2015-03-02 | 2015-03-02 | Intelligent LED drive control circuit |
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| CN104768283A true CN104768283A (en) | 2015-07-08 |
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| CN201510092853.7A Pending CN104768283A (en) | 2015-03-02 | 2015-03-02 | Intelligent LED drive control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768282A (en) * | 2015-03-02 | 2015-07-08 | 绍兴光大芯业微电子有限公司 | LED drive control circuit for switch dimming |
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| JP2007080771A (en) * | 2005-09-16 | 2007-03-29 | Nec Lighting Ltd | Low voltage power supply circuit for lighting, lighting device, and method of outputting power of low voltage power supply for lighting |
| EP2445315A1 (en) * | 2010-10-25 | 2012-04-25 | Panasonic Corporation | Dimming device and lighting apparatus using same |
| CN102724799A (en) * | 2012-06-28 | 2012-10-10 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) drive circuit and method without auxiliary winding |
| CN103052240A (en) * | 2013-01-16 | 2013-04-17 | 绍兴光大芯业微电子有限公司 | High-power factor light-emitting diode driving circuit structure |
| CN103152951A (en) * | 2013-03-13 | 2013-06-12 | 绍兴光大芯业微电子有限公司 | LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit |
| CN103327694A (en) * | 2013-06-26 | 2013-09-25 | 上海晶丰明源半导体有限公司 | Silicon controlled dimming LED drive circuit |
| CN104768282A (en) * | 2015-03-02 | 2015-07-08 | 绍兴光大芯业微电子有限公司 | LED drive control circuit for switch dimming |
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2015
- 2015-03-02 CN CN201510092853.7A patent/CN104768283A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007080771A (en) * | 2005-09-16 | 2007-03-29 | Nec Lighting Ltd | Low voltage power supply circuit for lighting, lighting device, and method of outputting power of low voltage power supply for lighting |
| EP2445315A1 (en) * | 2010-10-25 | 2012-04-25 | Panasonic Corporation | Dimming device and lighting apparatus using same |
| CN102724799A (en) * | 2012-06-28 | 2012-10-10 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) drive circuit and method without auxiliary winding |
| CN103052240A (en) * | 2013-01-16 | 2013-04-17 | 绍兴光大芯业微电子有限公司 | High-power factor light-emitting diode driving circuit structure |
| CN103152951A (en) * | 2013-03-13 | 2013-06-12 | 绍兴光大芯业微电子有限公司 | LED (light emitting diode) driving control circuit and driving circuit structure of LED driving control circuit |
| CN103327694A (en) * | 2013-06-26 | 2013-09-25 | 上海晶丰明源半导体有限公司 | Silicon controlled dimming LED drive circuit |
| CN104768282A (en) * | 2015-03-02 | 2015-07-08 | 绍兴光大芯业微电子有限公司 | LED drive control circuit for switch dimming |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768282A (en) * | 2015-03-02 | 2015-07-08 | 绍兴光大芯业微电子有限公司 | LED drive control circuit for switch dimming |
| CN104768282B (en) * | 2015-03-02 | 2017-05-31 | 绍兴光大芯业微电子有限公司 | A kind of LED drive control circuits of switch dimming |
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Application publication date: 20150708 |