CN204206542U

CN204206542U - A kind of LED dimming drive power circuit

Info

Publication number: CN204206542U
Application number: CN201420597282.3U
Authority: CN
Inventors: 宋龙飞; 胡延飞
Original assignee: NINGBO LINGWEI ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: NINGBO LINGWEI ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2014-10-16
Filing date: 2014-10-16
Publication date: 2015-03-11
Anticipated expiration: 2024-10-16

Abstract

The utility model relates to a kind of LED dimming drive power circuit, wherein, Boost circuit comprises the first switching tube, the drain electrode of the first switching tube is connected with the output of rectification circuit by the first resistance, source electrode is by the second grounding through resistance, and the output of rectification circuit is also connected with inductance and diode in turn; LED adjusting control circuit is made up of iW3602 control chip; First pin of iW3602 control chip is connected with the grid of the first switching tube, second pin is by a grounding through resistance, three-prong is by a capacity earth, 4th pin is by a grounding through resistance, the direct ground connection of 5th pin, 6th pin is by a capacity earth, and the 7th pin is connected with the grid of second switch pipe, and the 8th pin connects power supply; The drain electrode of second switch pipe connects the output port of LED dimming drive power circuit, and source electrode is by power resistor ground connection.The utility model can identify phase-cut dimmer automatically, coordinates different mode of operations, makes whole system always work in Optimal State.

Description

A kind of LED dimming drive power circuit

Technical field

The utility model relates to LED light regulating technology field, particularly relates to a kind of LED dimming drive power circuit.

Background technology

Under the overall background of global energy-saving and emission-reduction, as green, the LED illumination of environmental protection and energy saving, more and more favors by market.And the application of light regulating technology in LED illumination will improve the effect of energy-saving and emission-reduction further.Dimming lamp makes market, and office lighting can environmentally brightness and adjust illumination.Developing rapidly of light regulating technology, can bring a brand-new field into by LED illumination light adjusting system, thus the application of the LED illumination of environment protecting and power-saving is carried out on a large scale universal with promote.

Due to more energy-conservation than incandescent lamp more than 5 times of LED itself, than fluorescent lamp, electricity-saving lamp also energy-conservation about a times, also mercurous unlike fluorescent lamp, electricity-saving lamp.If it is energy-conservation that light modulation can also be utilized, and is so also very important energy saving means.But past all light sources are not easy to realize light modulation all very much, and easy one of light modulation LED just very large advantage.Such as, because in fact do not need to turn on light or at least do not need so bright in a lot of occasion, but lamp is but opened very bright, the street lamp of period at midnight to dawn; Illuminating lamp when subway carriage reaches ground, suburb from underground compartment; More commonly all also open there near the fluorescent lamp of the office of window, school, factory etc. when sunny.After using LED instead, can light modulation freely, these electric energy can save completely, so for lamp light-regulating, on family's wall, light modulation is not main application scenario, and market is also very little.Street lamp on the contrary, office, market, school, factory light modulation be as required only prior occasion, not only market is huge, and energy-conservation considerable.But existing LED dimming mode efficiency is lower, and degree of regulation is not high, flicker and dazzle situation is had to occur.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of LED dimming drive power circuit, automatically can identify phase-cut dimmer, coordinate different mode of operations, make whole system always work in Optimal State.

The utility model solves the technical scheme that its technical problem adopts: provide a kind of LED dimming drive power circuit, comprise LED adjusting control circuit and Boost circuit, described Boost circuit comprises the first switching tube, the drain electrode of described first switching tube is connected with the output of rectification circuit by the first resistance, source electrode is by the second grounding through resistance, and the output of described rectification circuit is also connected with inductance and diode in turn; Described LED adjusting control circuit is made up of iW3602 control chip; First pin of described iW3602 control chip is connected with the grid of the first switching tube, second pin is by a grounding through resistance, three-prong is by a capacity earth, 4th pin is by a grounding through resistance, the direct ground connection of 5th pin, 6th pin is by a capacity earth, and the 7th pin is connected with the grid of second switch pipe, and the 8th pin connects power supply; The drain electrode of described second switch pipe connects the output port of LED dimming drive power circuit, and source electrode is by power resistor ground connection.

First pin of described iW3602 control chip is also by dimming capacitors ground connection.

Described inductance two ends are also parallel with resistance.

Described rectification circuit is rectifier circuit.

Beneficial effect

Owing to have employed above-mentioned technical scheme, the utility model compared with prior art, have following advantage and good effect: the utility model is applicable to the requirement of the built-in driving of lamp, the design of driving isolation can save the isolation cost of lamp system, optimizes the heat dispersion of LED.The number of elements of whole design is few, volume can be as small as be built in E27/E26 lamp holder ball big gun or PAR lamp in.The utility model dimming mode efficiency is high, and in 4W design, efficiency is greater than efficiency in 80%, 7W design and is greater than 85%; Dimming scope 100% ~ 1%, can support the main flow dimmer on European & American Market.

Accompanying drawing explanation

Fig. 1 is circuit diagram of the present utility model.

Embodiment

Below in conjunction with specific embodiment, set forth the utility model further.Should be understood that these embodiments are only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the utility model instruction.

Execution mode of the present utility model relates to a kind of LED dimming drive power circuit, as shown in Figure 1, comprise LED adjusting control circuit and Boost circuit, described Boost circuit comprises the first switching tube Q1, the drain electrode of described first switching tube Q1 is connected with the output of rectification circuit by the first resistance R2, source electrode is by the second resistance R17 ground connection, and the output of described rectification circuit is also connected with inductance L 2 and diode D3 in turn.Wherein, described rectification circuit is rectifier circuit, and inductance L 2 two ends are also parallel with resistance R1.Described LED adjusting control circuit is made up of iW3602 control chip; First pin of described iW3602 control chip is connected with the grid of the first switching tube Q1, second pin is by a resistance R15 ground connection, three-prong is by an electric capacity C6 ground connection, 4th pin is by a resistance R16 ground connection, the direct ground connection of 5th pin, 6th pin is by an electric capacity C7 ground connection, and the 7th pin is connected with the grid of second switch pipe Q3, and the 8th pin meets power supply VCC.Wherein, the first pin of described iW3602 control chip is also by dimming capacitors C5 ground connection.The drain electrode of described second switch pipe Q3 connects the output port of LED dimming drive power circuit, and source electrode is by power resistor R13 and R14 ground connection.

Boost circuit is characteristic for controllable silicon and field effect transistor dimmer and designs.As shown in Figure 1, the circuit that first resistance R2, inductance L 2, diode D3, switching tube Q1 and the second resistance R17 form both can make dimmer steady operation, power factor can be improved again by Boost circuit, the digital circuit of iW3602 control chip inside judges the classification of cut signal by the rate of change detecting voltage, thus judges the dimmer joined together by it.Specific works is as follows: starting current passes through the DIODE of iW3602 control chip inside to VCC capacitor charging from resistance R5, resistance R10; Because D-FET does not have negative voltage and conducting, electric current in resistance R3, resistance R9, is had to charge to VCC; Start working when VCC reaches 12V, VINPIN voltage step-down, the VGS of switching tube Q2 becomes negative voltage and turns off; D-FET cuts off resistance R3 upon actuation, resistance R9 can reduce power consumption in selection, and adjusting resistance R3, resistance R9 can change start-up time; IW3602 control chip has three HalfCycle conductings when starting, about 30mS, preliminary examination dimmer state, resistance R2 is in this conducting completely therebetween, dimmer operation is under resistive load condition: reasonably resistance R17 can provide fixing continuous current, also limit input current peak value; Resistance R5 can reduce the voltage stress of the preliminary examination time on switching tube Q1 (power consumption), and reduces the current spike in controllable silicon cut conducting moment, and rational resistance R2 resistance can ensure the reliability of switching tube Q1.

Circuit is by second switch pipe Q3 switch control rule output parameter as shown in Figure 1, meets dimming capacitors C5 over the ground, can improve scope and the compatibility of light modulation at iW3602 control chip first pin; EMC performance also improves greatly simultaneously.

Claims

1. a LED dimming drive power circuit, comprise LED adjusting control circuit and Boost circuit, it is characterized in that, described Boost circuit comprises the first switching tube (Q1), the drain electrode of described first switching tube (Q1) is connected with the output of rectification circuit by the first resistance (R2), source electrode is by the second resistance (R17) ground connection, and the output of described rectification circuit is also connected with inductance (L2) and diode (D3) in turn; Described LED adjusting control circuit is made up of iW3602 control chip; First pin of described iW3602 control chip is connected with the grid of the first switching tube (Q1), second pin is by resistance (R15) ground connection, three-prong is by electric capacity (C6) ground connection, 4th pin is by resistance (R16) ground connection, the direct ground connection of 5th pin, 6th pin is by electric capacity (C7) ground connection, 7th pin is connected with the grid of second switch pipe (Q3), and the 8th pin connects power supply (VCC); The drain electrode of described second switch pipe (Q3) connects the output port of LED dimming drive power circuit, and source electrode is by power resistor ground connection.

2. LED dimming drive power circuit according to claim 1, is characterized in that, the first pin of described iW3602 control chip is also by dimming capacitors (C5) ground connection.

3. LED dimming drive power circuit according to claim 1, is characterized in that, described inductance (L2) two ends are also parallel with resistance (R1).

4. LED dimming drive power circuit according to claim 1, is characterized in that, described rectification circuit is rectifier circuit.