CN104981064A - Simple and practical harmonic wave improved LED drive circuit - Google Patents
Simple and practical harmonic wave improved LED drive circuit Download PDFInfo
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- CN104981064A CN104981064A CN201510348263.6A CN201510348263A CN104981064A CN 104981064 A CN104981064 A CN 104981064A CN 201510348263 A CN201510348263 A CN 201510348263A CN 104981064 A CN104981064 A CN 104981064A
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- 238000005070 sampling Methods 0.000 claims description 20
- 239000004065 semiconductor Substances 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000001105 regulatory Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000006011 modification reaction Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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Abstract
The invention discloses a simple and practical harmonic wave improved LED drive circuit. The circuit includes a bridge rectification module, and a constant current module, an LED load, an electromagnetic interference filter and a valley fill circuit that are connected to the bridge rectification module. The bridge rectification module is connected to commercial power through the electromagnetic interference filter. The valley fill circuit is connected to the output end of the bridge rectification module. The electromagnetic interference filter is in series connection between an AC wire inlet end and the bridge rectification module to filter electromagnetic interference, harmonic waves are improved by improving of a conduction angle input to a rectification filter circuit, the valley fill circuit is utilized to fill the circuit, and total harmonic wave distortion is minimized. Therefore, harmonic wave components are prevented from polluting a power grid, and active power is guaranteed. The drive circuit has the advantages of simple structure and low cost.
Description
Technical field
The present invention relates to LED drive circuit field, particularly, relate to the improved-type LED drive circuit of a kind of simple and practical harmonic wave.
Background technology
LED light source, as a kind of novel green light source, because it has the advantages such as power consumption is low, the life-span is long, reaction speed is fast, energy-efficient, is applied more and more widely.
Under same brightness, LED light source power consumption is only 1/10th of ordinary incandescent lamp, and the life-span can extend 100 times.But its life-span is decided by driving power to a great extent, therefore a kind of reliably, conversion efficiency high, LED driving power that the life-span is long is most important for LED light source.
At present, supply power mode many employings direct current of LED, the civil power of power supply needs to be converted to direct current by rectifier bridge, more luminous by drive circuit driving LED lamp pearl.Its importation is generally made up of bridge rectifier and filtering capacitor, and the two all belongs to non-linear element.Due to the existence of Large Copacity filtering capacitor, make the angle of flow of rectifier diode become very narrow, only ability conducting near the peak value of AC-input voltage, causes AC input current to produce serious distortion, is turned into spike.Contain a large amount of harmonic components in this current waveform, not only pollute electrical network, the active power exported after also causing filtering significantly reduces, and power factor is significantly reduced.
Summary of the invention
Object of the present invention is just to provide a kind of simple and practical harmonic wave improved-type LED drive circuit, and this LED drive circuit improves harmonic wave by setting up Electromagnetic interference filter and filling out paddy circuit.
The improved-type LED drive circuit of simple and practical harmonic wave, comprises bridge heap rectification module and the constant flow module be connected on bridge heap rectification module and LED load; Described constant flow module comprises current constant control chip IC 1, metal-oxide-semiconductor Q1, divider resistance R5, regulating resistance R6, sampling resistor R7 and sampling resistor R8; The output of described LED load positive pole connecting bridge heap rectification module, negative pole connects the D pole of metal-oxide-semiconductor Q1; The power input of current constant control chip IC 1 is connected on bridge heap rectification module by divider resistance R5; The sampling end of current constant control chip IC 1 is connected respectively to D pole and the S pole of metal-oxide-semiconductor Q1 by sampling resistor R7 and sampling resistor R8, the S pole of metal-oxide-semiconductor Q1 is also connected to the output of current constant control chip IC 1 by regulating resistance R6 ground connection, G pole; Also comprise Electromagnetic interference filter and fill out paddy circuit, described bridge heap rectification module accesses civil power by Electromagnetic interference filter, described in fill out the output that paddy circuit is connected to bridge heap rectification module.
As a further improvement on the present invention, described bridge heap rectification module is full-bridge rectification bridge heap BD1, and described Electromagnetic interference filter comprises electric capacity C3, electric capacity C4, inductance L 1 and inductance L 2; Two inputs of full-bridge rectification bridge heap BD1 are connected civil power live wire and zero line respectively by inductance L 1 with inductance L 2; The direct current output cathode of full-bridge rectification bridge heap BD1 is the output of bridge heap rectification module, with LED load positive pole, divider resistance R5, fills out paddy circuit and is all connected, direct current output negative pole ground connection; Electric capacity C3 is connected between two inputs of full-bridge rectification bridge heap BD1, and electric capacity C4 one end connects civil power zero line, and the other end connects one end be connected with civil power live wire of inductance L 1.
Further, also comprise fuse F1, thermistor NTC, piezo-resistance UR, fuse F1 is with the series connection of thermistor NTC inductance and fuse F1 is connected inductance L 1, and thermistor NTC connects civil power live wire; Piezo-resistance UR one end connects civil power zero line, and the other end is connected between fuse F1 and thermistor NTC.
Further, described paddy circuit of filling out comprises diode D1, diode D2, diode D3, electric capacity C5, electric capacity C6 and resistance R1, and electric capacity C6, diode D2, resistance R1, electric capacity C5 are cascaded successively, wherein, the output of electric capacity C6 connecting bridge heap rectification module, electric capacity C5 ground connection; Diode D2 positive pole connects electric capacity C6, negative pole contact resistance R1; Diode D1 plus earth, negative pole connect the positive pole of diode D2; Output, the positive pole of diode D3 negative pole connecting bridge heap rectification module are connected between resistance R1 and electric capacity C5.
Further, described LED load two ends are also parallel with filter capacitor C2, and power output end and the earth terminal of described current constant control chip IC 1 are parallel with filter capacitor C1.
Preferably, the resistance of described regulating resistance R6 is 5 Ω.
Preferably, metal-oxide-semiconductor Q1 is N-channel MOS pipe.
To sum up, the invention has the beneficial effects as follows: the present invention piles at interchange end of incoming cables and bridge Electromagnetic interference filter filtering electromagnetic interference of connecting between rectification module, harmonic wave is improved by the angle of flow mode improving input rectifying filter circuit, and use and fill out paddy circuit and fill and lead up circuit, reduce total harmonic distortion, harmonic component can not only be avoided to pollute electrical network, can also active power be ensured; There is the advantage that structure is simple, cost is low.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the improved-type LED drive circuit of simple and practical harmonic wave of the present embodiment, comprises bridge heap rectification module, is connected to constant flow module, LED load, the Electromagnetic interference filter on bridge heap rectification module and fills out paddy circuit; Wherein: bridge heap rectification module has two inputs and two outputs, two outputs are respectively direct current output cathode, direct current output negative pole, two input accesses civil power by Electromagnetic interference filter, and direct current output cathode connects constant flow module, LED load simultaneously and fills out paddy circuit.
Constant flow module comprises current constant control chip IC 1, metal-oxide-semiconductor Q1, divider resistance R5, regulating resistance R6, sampling resistor R7 and sampling resistor R8; The direct current output cathode of above-mentioned LED load positive pole connecting bridge heap rectification module, negative pole connects the D pole (drain electrode) of metal-oxide-semiconductor Q1; Current constant control chip IC 1 has power input VH, sampling end CS, earth terminal GND, output GATE, power output end VDD, its earth terminal GND ground connection, and power input VH is connected on bridge heap rectification module by divider resistance R5, obtains operating voltage; Parallel filtering electric capacity C1 on power output end VDD and earth terminal GND, the operating voltage of level and smooth current constant control chip IC 1, makes current constant control chip IC 1 keep steady operation; Sampling end CS is connected respectively to D pole and S pole (source electrode) of metal-oxide-semiconductor Q1 by sampling resistor R7 and sampling resistor R8; Output GATE connects the G pole (grid) of metal-oxide-semiconductor Q1, controls conducting and the cut-off of metal-oxide-semiconductor, and the S pole of metal-oxide-semiconductor Q1 is also by regulating resistance R6 ground connection.
Described bridge heap rectification module is full-bridge rectification bridge heap BD1, and full-bridge rectification bridge heap BD1 is connected and the rectifier bridge stack be packaged as a whole by the form of full-wave bridge rectifier circuit by 4 rectifier diodes.Described Electromagnetic interference filter comprises electric capacity C3, electric capacity C4, inductance L 1 and inductance L 2; Two inputs of full-bridge rectification bridge heap BD1 are connected civil power live wire L and zero line N respectively by inductance L 1 with inductance L 2; The direct current output cathode of full-bridge rectification bridge heap BD1 is the output of bridge heap rectification module, with LED load positive pole, divider resistance R5, fills out paddy circuit and is all connected, direct current output negative pole ground connection; Electric capacity C3 is connected between two inputs of full-bridge rectification bridge heap BD1, and electric capacity C4 one end connects civil power zero line N, and the other end connects one end be connected with civil power live wire L of inductance L 1.
Described paddy circuit of filling out comprises diode D1, diode D2, diode D3, electric capacity C5, electric capacity C6 and resistance R1, electric capacity C6, diode D2, resistance R1, electric capacity C5 are cascaded successively, wherein, the output of electric capacity C6 one end connecting bridge heap rectification module and full-bridge rectification bridge pile the direct current output cathode of BD1, the positive pole of other end connection diode D2, electric capacity C5 one end ground connection, other end contact resistance R1; The negative pole contact resistance R1 of diode D2; Diode D1 plus earth, negative pole connect the positive pole of diode D2; Output, the positive pole of diode D3 negative pole connecting bridge heap rectification module are connected between resistance R1 and electric capacity C5.
In the present embodiment, series inductance L1, L2 between interchange end of incoming cables (civil power zero line N and civil power live wire L) and full-bridge rectification bridge heap BD1, and make electric capacity C3, electric capacity C4, inductance L 1 and inductance L 2 form a π type Electromagnetic interference filter filtering electromagnetic interference, harmonic wave is improved by the angle of flow mode improving input rectifying filter circuit, and use and fill out paddy circuit and fill and lead up circuit, reduce total harmonic distortion.What be made up of diode D1, diode D2, diode D3, electric capacity C5, electric capacity C6 and resistance R1 fills out 3 subharmonic and 5 subharmonic that paddy circuit can limit 50Hz alternating current.Harmonic component can not only be avoided to pollute electrical network, can also active power be ensured.
Above-mentioned LED load is preferably the LED string that the series connection of multiple LED lamp bead is formed, also can be single led lamp pearl, sampling resistor R7, sampling resistor R8 gather the electric current on LED load loop, current constant control chip IC 1 is according to the conducting state of the Current Control metal-oxide-semiconductor gathered, thus control loop voltage, the ratio reaching loop voltage and resistance is invariable, realizes current constant.
[embodiment 2]
On the basis of embodiment 1, compact LED drive circuit in the present embodiment also comprises for the fuse F1 of surge protection, thermistor NTC, piezo-resistance UR, fuse F1 is with the series connection of thermistor NTC inductance and fuse F1 is connected inductance L 1, and thermistor NTC connects civil power live wire L; Piezo-resistance UR one end connects civil power zero line N, and the other end is connected between fuse F1 and thermistor NTC.
In order to avoid the surge current that circuit produced in the moment of opening, be connected in series a power type thermal resistance NTC in a power, effectively can suppress surge current when opening, and the resistance value of thermistor NTC will drop to very little degree after completing surge current suppression effect, its power consumed is negligible, can not impact normal operating current.
Piezo-resistance UR is connected in parallel in AC circuit and mainly plays " deboost superelevation " effect.
Above-mentioned LED load two ends are also parallel with filter capacitor C2, make the stabilized input voltage of LED load.
In the present embodiment, current constant control chip IC 1 adopts ORG8510 constant current chip, and metal-oxide-semiconductor Q1 is N-channel MOS pipe.
Above-mentioned filter capacitor C1 adopts ceramic condenser.
In the present embodiment, the resistance of above-mentioned regulating resistance R6 is 5 Ω, to ensure the voltage that R6 has point compression functions R6 can be avoided again to divide too high; Divider resistance R5, regulating resistance R6, sampling resistor R7, sampling resistor R8 adopt high pressure Chip-R, and filter capacitor C1 and filter capacitor C2 adopts high pressure patch capacitor, to reduce volume shared by drive circuit.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (7)
1. the improved-type LED drive circuit of simple and practical harmonic wave, comprises bridge heap rectification module and the constant flow module be connected on bridge heap rectification module and LED load; Described constant flow module comprises current constant control chip IC 1, metal-oxide-semiconductor Q1, divider resistance R5, regulating resistance R6, sampling resistor R7 and sampling resistor R8; The output of described LED load positive pole connecting bridge heap rectification module, negative pole connects the D pole of metal-oxide-semiconductor Q1; The power input of current constant control chip IC 1 is connected on bridge heap rectification module by divider resistance R5; The sampling end of current constant control chip IC 1 is connected respectively to D pole and the S pole of metal-oxide-semiconductor Q1 by sampling resistor R7 and sampling resistor R8, the S pole of metal-oxide-semiconductor Q1 is also connected to the output of current constant control chip IC 1 by regulating resistance R6 ground connection, G pole; It is characterized in that, also comprise Electromagnetic interference filter and fill out paddy circuit, described bridge heap rectification module accesses civil power by Electromagnetic interference filter, described in fill out the output that paddy circuit is connected to bridge heap rectification module.
2. the improved-type LED drive circuit of simple and practical harmonic wave according to claim 1, is characterized in that, described bridge heap rectification module is full-bridge rectification bridge heap BD1, and described Electromagnetic interference filter comprises electric capacity C3, electric capacity C4, inductance L 1 and inductance L 2; Two inputs of full-bridge rectification bridge heap BD1 are connected civil power live wire and zero line respectively by inductance L 1 with inductance L 2; The direct current output cathode of full-bridge rectification bridge heap BD1 is the output of bridge heap rectification module, with LED load positive pole, divider resistance R5, fills out paddy circuit and is all connected, direct current output negative pole ground connection; Electric capacity C3 is connected between two inputs of full-bridge rectification bridge heap BD1, and electric capacity C4 one end connects civil power zero line, and the other end connects one end be connected with civil power live wire of inductance L 1.
3. the improved-type LED drive circuit of simple and practical harmonic wave according to claim 3, it is characterized in that, also comprise fuse F1, thermistor NTC, piezo-resistance UR, fuse F1 is with the series connection of thermistor NTC inductance and fuse F1 is connected inductance L 1, and thermistor NTC connects civil power live wire; Piezo-resistance UR one end connects civil power zero line, and the other end is connected between fuse F1 and thermistor NTC.
4. according to the arbitrary described improved-type LED drive circuit of simple and practical harmonic wave of claims 1 to 3, it is characterized in that, described paddy circuit of filling out comprises diode D1, diode D2, diode D3, electric capacity C5, electric capacity C6 and resistance R1, electric capacity C6, diode D2, resistance R1, electric capacity C5 are cascaded successively, wherein, the output of electric capacity C6 connecting bridge heap rectification module, electric capacity C5 ground connection; Diode D2 positive pole connects electric capacity C6, negative pole contact resistance R1; Diode D1 plus earth, negative pole connect the positive pole of diode D2; Output, the positive pole of diode D3 negative pole connecting bridge heap rectification module are connected between resistance R1 and electric capacity C5.
5. according to the arbitrary described improved-type LED drive circuit of simple and practical harmonic wave of claims 1 to 3, it is characterized in that, described LED load two ends are also parallel with filter capacitor C2, and power output end and the earth terminal of described current constant control chip IC 1 are parallel with filter capacitor C1.
6., according to the arbitrary described improved-type LED drive circuit of simple and practical harmonic wave of claims 1 to 3, it is characterized in that, the resistance of described regulating resistance R6 is 5 Ω.
7., according to the arbitrary described improved-type LED drive circuit of simple and practical harmonic wave of claims 1 to 3, it is characterized in that, described metal-oxide-semiconductor Q1 is N-channel MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510348263.6A CN104981064A (en) | 2015-06-23 | 2015-06-23 | Simple and practical harmonic wave improved LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510348263.6A CN104981064A (en) | 2015-06-23 | 2015-06-23 | Simple and practical harmonic wave improved LED drive circuit |
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| CN104981064A true CN104981064A (en) | 2015-10-14 |
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| CN201510348263.6A Pending CN104981064A (en) | 2015-06-23 | 2015-06-23 | Simple and practical harmonic wave improved LED drive circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN108646128A (en) * | 2018-04-27 | 2018-10-12 | 杭州中安电子有限公司 | Bridge heap high temperature reverse bias ageing system |
| CN111934534A (en) * | 2020-07-21 | 2020-11-13 | 深圳合作照明有限公司 | PFC power supply |
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2015
- 2015-06-23 CN CN201510348263.6A patent/CN104981064A/en active Pending
Patent Citations (6)
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| CN2571121Y (en) * | 2002-09-03 | 2003-09-03 | 潘启锡 | Electronic blast |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN108646128A (en) * | 2018-04-27 | 2018-10-12 | 杭州中安电子有限公司 | Bridge heap high temperature reverse bias ageing system |
| CN111934534A (en) * | 2020-07-21 | 2020-11-13 | 深圳合作照明有限公司 | PFC power supply |
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