CN101227779B - Insulation type general use illumination LED driving circuit - Google Patents
Insulation type general use illumination LED driving circuit Download PDFInfo
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- CN101227779B CN101227779B CN2008100452906A CN200810045290A CN101227779B CN 101227779 B CN101227779 B CN 101227779B CN 2008100452906 A CN2008100452906 A CN 2008100452906A CN 200810045290 A CN200810045290 A CN 200810045290A CN 101227779 B CN101227779 B CN 101227779B
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Abstract
The invention belongs to the electronic technical field and relates to a versatile lighting LED driving circuit. The invention comprises an input rectifier circuit, a power factor correction (PFC) control circuit, a transformer surge current and peak voltage absorption circuit, an optical coupler isolation feedback circuit, an isolated switching transformer and an unidirectional rectifier output circuit. The invention takes a power management chip NCP1653 of the OnSemi Company as a control core, primary current of the switching transformer is checked to realize the power factor correction function, a circuit topological structure is a flyback isolated type, the working mode is a continuous conduction mode, the circuit topological structure has the functions of power factor correction, light modulation, constant current constant voltage output and absorbing the surge current of switch element guide circuit instant and the peak voltage of cutting instant, simultaneously, since the invention adopts the power management chip NCP1653, a large amount of peripheral circuit can be saved, and thereby the invention is has the advantages of low cost and small volume and is suitable for batch production.
Description
Technical field
The invention belongs to electronic technology field, relate to general illumination LED (light-emitting diode) drive circuit, particularly a kind of isolated high reliability illumination LED drive circuit.
Background technology
The LED lighting technology has advantages such as energy-saving and environmental protection, life-span are long and easy to control, is one of the high-tech sector of tool development prospect of 21 century, becomes the leading of illumination market with replacing incandescent lamp and fluorescent lamp.Under LED Lighting Industry bright prospect like this, at the different application of lighting field, also in development rapidly, it mostly adopts switch power technology to various LED lamp drive circuits.But, what present many led drive circuits adopted is non-isolated Drive Structure or the isolated Drive Structure that does not have Active PFC (PFC) function, non-isolated led drive circuit poor reliability, the led drive circuit power utilization rate of no PFC function is low.In addition, for isolated circuit structure, owing to there is isolating transformer, can produce very big surge current when making the switch element conducting, shutdown moment can produce very big peak voltage, and this can influence the life-span of power-efficient and switching tube.Existing isolation type switching power supply is at the absorption circuit comparative maturity of switch element shutdown moment, and the absorption circuit in the time of the switch element conducting seldom, therefore, how can absorb the peak voltage of switch element shutdown moment, can absorb the surge current of opening moment again and just become a technical barrier.
Summary of the invention
The present invention overcomes the deficiency of existing led drive circuit, a kind of isolated high performance universal illumination LED drive circuit is provided, this circuit has isolated led drive circuit high reliability features, have Active PFC function and dimming function simultaneously, and have the surge absorption function of switch element unlatching or turn-off transient.
Detailed technology scheme of the present invention is as follows:
A kind of insulation type general use illumination LED driving circuit, by input rectification circuit, adjusting control circuit, Active PFC (PFC, Power Factor Correction) control circuit, transformer inrush current and peak voltage absorb circuit, light-coupled isolation feedback circuit, isolated switch transformer and unidirectional rectifying output circuit composition, it is characterized in that:
Adjusting control circuit is made of diode D8 and capacitor C 11; The Active PFC control circuit comprises PFC control module circuit that the power management chip NCP1653 by resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R11, R12, diode D1, capacitor C 1, C2, C3, C4, C5 and ON company constitutes and the start-up circuit of the NCP1653 that is made of resistance R 10, diode D2, capacitor C 9 is formed; Transformer inrush current and peak voltage absorb circuit and are made of diode D4, D5, capacitor C 6, inductance L 1, L2; The light-coupled isolation feedback circuit is made of resistance R 13, R14, R15, R16, R17, R18, capacitor C 8, triode Q2, three terminal device TL431 and optical coupling isolator U2A, U2B; Unidirectional rectifying output circuit by transformer secondary output winding, diode D6, inductance L 3, capacitor C 7, C10 and as the LED 1 of load, LED2 ..., LED19, LED20 form;
The output terminals A of electric main after the rectification circuit rectification meets the port C of the elementary winding of isolated switch transformer T1, and the output B ground connection GND of rectification circuit links to each other by capacitor C 1 between two output terminals A, the B; The PWM dim signal connects the negative pole of diode D8, and the positive pole of diode D8 connects the pin two of power management chip NCP1653, and the negative pole of diode D8 meets IC ground GND_IC by capacitor C 11, and the positive pole of diode D8 meets IC ground GND_IC by capacitor C 4; The pin 3 of power management chip NCP1653 meets IC ground GND_IC by capacitor C 3 on the one hand, successively by meeting the port C of the elementary winding of isolated switch transformer T1 after resistance R 2 and the resistance R 1, the tie point of resistance R 1 and resistance R 2 meets IC ground GND_IC by capacitor C 2 on the other hand; The pin 4 of power management chip NCP1653 is by resistance R 5 ground connection GND; Meet IC ground GND_IC behind the parallel circuits of the pin 5 of power management chip NCP1653 by resistance R 9 and capacitor C 5; The pin 6 of power management chip NCP1653 meets IC ground GND_IC; Link to each other by resistance R 7 between IC ground GND_IC and the ground GND; The pin 7 of power management chip NCP1653 connects the grid of MOS switching tube Q1 by resistance R 11, the grid of MOS switching tube Q1 meets IC ground GND_IC by resistance R 12 simultaneously, the source electrode of MOS switching tube Q1 meets IC ground GND_IC, and the drain electrode of MOS switching tube Q1 meets the port D of the elementary winding of isolated switch transformer T1 by inductance L 2; The pin 8 of power management chip NCP1653 meets IC ground GND_IC by capacitor C 9 on the one hand, connect the negative pole of diode D2, diode D3 and the collector electrode of the controlled part U2B of optical coupling isolator on the other hand simultaneously, the positive pole of diode D2 meets the port C of the elementary winding of isolated switch transformer T1 by resistance R 10, meet IC ground GND_IC by resistance R 3 when the emitter of the controlled part U2B of optical coupling isolator connects the positive pole of diode D1 by resistance R 6, the negative pole of diode D1 connects the pin one of power management chip NCP1653 by resistance R 4; The pin one of power management chip NCP1653 also connects the pin 8 of power management chip NCP1653 successively by resistance R 4, resistance R 8; The positive pole of diode D3 meets the port E of isolated switch transformer T1 feedback winding, and the port F of isolated switch transformer T1 feedback winding meets IC ground GND_IC; The port C of the elementary winding of isolated switch transformer T1 connects the negative pole of diode D4, and the positive pole of diode D4 links to each other with the port D of the elementary winding of isolated switch transformer T1 by capacitor C 6; The positive pole of diode D4 links to each other by the negative pole that inductance L 1 meets diode D5, and the positive pole of diode D5 meets IC ground GND_IC; The port G of isolated switch transformer T1 secondary winding connects the positive pole of diode D6, and port H meets output ground GND_out; The negative pole of diode D6 meets output ground GND_out by capacitor C 10 on the one hand, on the other hand successively by meeting output ground GND_out after inductance L 3, the capacitor C 7; The tie point of inductance L 3 and capacitor C 7 meets output ground GND_out by resistance R 17, resistance R 18 on the one hand successively, connects the positive pole of optical coupling isolator control section U2A on the other hand by resistance R 15; The negative pole of optical coupling isolator control section U2A connects the collector electrode of triode Q2 and the negative pole of three terminal device TL431 simultaneously, and resistance R 16 is in parallel with optical coupling isolator control section U2A; The positive pole of three terminal device TL431 connects output ground GND_out, the control utmost point connecting resistance R17 of three terminal device TL431 and the tie point of resistance R 18; The emitter of triode Q2 meets output ground GND_out, and the base stage of triode Q2 links to each other with the collector electrode of triode Q2 by capacitor C 8 on the one hand, on the other hand successively by meeting output ground GND_out after resistance R 14, the resistance R 13;
Whole isolated formula general illumination LED drive circuit when work, as LED for illumination LED1, the LED2 of load ... the positive termination inductance L 3 after LED19, the LED20 series connection and the tie point of resistance R 15, the tie point of negative terminal connecting resistance R13 and resistance R 14.
The present invention has following characteristics:
1, adopt the power management chip NCP1653 of ON company to be the control core, the primary current of sense switch transformer T1 realizes Active PFC.
2, the topological structure of this circuit is isolated anti-(FlyBack) circuit that swashs, and mode of operation is continuous conduction mode (CCM, Continuous Current Mode).
3, constitute adjusting control circuit by diode D8 and capacitor C 11, can with the PWM ripple to LED brightness regulate, thereby have dimming function.
4, constitute the isolated form feedback circuit by resistance R 13, R14, R15, R16, R17, R18, capacitor C 8, triode Q2, three terminal device TL431 and optical coupling isolator (U2A, U2B), guarantee constant current voltage stabilizing output, realize overcurrent and LED open-circuit-protection.
5, constitute transformer inrush current and peak voltage by diode D4, D5, capacitor C 6, inductance L 1, L2 and absorb circuit, have the function of the peak voltage of the surge current that absorbs switch element conducting moment and shutdown moment.
In sum, insulation type general use illumination LED driving circuit of the present invention has Active PFC, light modulation, crossing current voltage stabilizing output and absorbs the surge current of switch element conducting moment and the function of the peak voltage of shutdown moment.The present invention simultaneously can save a large amount of peripheral circuits, thereby have the advantage that cost is low, volume is little owing to adopted power management chip NCP1653, is fit to produce in batches.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
As Fig. 2; circuit is mainly by NCP1653; isolated switch transformer T1; surge absorbing circuit (diode D4; D5; capacitor C 6; inductance L 1; L2); optical coupling isolator (U2A; U2B) and resistance; electric capacity constitutes; the electric current of the CS pin of NCP1653 (the 4th pin) detection branch is to change pulse duration; realize PFC; by diode D4; D4; D5; inductance L 1; capacitor C 6 absorbs the peak voltage that the switching tube shutdown moment produces; inductance L 2 absorbs the surge current of switching tube conducting moment generation; the FB pin of NCP1653 (the 1st pin) detects the feedback signal of optical coupling isolator; realize output overcurrent and LED open circuit protecting function, the V of NCP1653
ControlPin (the 2nd pin) inserts pwm control signal through diode D8 can realize the LED dimming function.
Claims (1)
1. insulation type general use illumination LED driving circuit, absorb circuit, light-coupled isolation feedback circuit, isolated switch transformer and unidirectional rectifying output circuit by input rectification circuit, adjusting control circuit, Active PFC control circuit, transformer inrush current and peak voltage and form, it is characterized in that:
Adjusting control circuit is made of diode D8 and capacitor C 11; The Active PFC control circuit comprises PFC control module circuit that the power management chip NCP1653 by resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R11, R12, diode D1, capacitor C 1, C2, C3, C4, C5 and ON company constitutes and the start-up circuit of the NCP1653 that is made of resistance R 10, diode D2, capacitor C 9 is formed; Transformer inrush current and peak voltage absorb circuit and are made of diode D4, D5, capacitor C 6, inductance L 1, L2; The light-coupled isolation feedback circuit is made of resistance R 13, R14, R15, R16, R17, R18, capacitor C 8, triode Q2, three terminal device TL431 and optical coupling isolator U2A, U2B; Unidirectional rectifying output circuit by transformer secondary output winding, diode D6, inductance L 3, capacitor C 7, C10 and as the LED 1 of load, LED2 ..., LED19, LED20 form;
The output terminals A of electric main after the rectification circuit rectification meets the port C of the elementary winding of isolated switch transformer T1, and the output B ground connection GND of rectification circuit links to each other by capacitor C 1 between two output terminals A, the B; The PWM dim signal connects the negative pole of diode D8, and the positive pole of diode D8 connects the pin two of power management chip NCP1653, and the negative pole of diode D8 meets IC ground GND_IC by capacitor C 11, and the positive pole of diode D8 meets IC ground GND_IC by capacitor C 4; The pin 3 of power management chip NCP1653 meets IC ground GND_IC by capacitor C 3 on the one hand, successively by meeting the port C of the elementary winding of isolated switch transformer T1 after resistance R 2 and the resistance R 1, the tie point of resistance R 1 and resistance R 2 meets IC ground GND_IC by capacitor C 2 on the other hand; The pin 4 of power management chip NCP1653 is by resistance R 5 ground connection GND; Meet IC ground GND_IC behind the parallel circuits of the pin 5 of power management chip NCP1653 by resistance R 9 and capacitor C 5; The pin 6 of power management chip NCP1653 meets IC ground GND_IC; Link to each other by resistance R 7 between IC ground GND_IC and the ground GND; The pin 7 of power management chip NCP1653 connects the grid of MOS switching tube Q1 by resistance R 11, the grid of MOS switching tube Q1 meets IC ground GND_IC by resistance R 12 simultaneously, the source electrode of MOS switching tube Q1 meets IC ground GND_IC, and the drain electrode of MOS switching tube Q1 meets the port D of the elementary winding of isolated switch transformer T1 by inductance L 2; The pin 8 of power management chip NCP1653 meets IC ground GND_IC by capacitor C 9 on the one hand, connect the negative pole of diode D2, diode D3 and the collector electrode of the controlled part U2B of optical coupling isolator on the other hand simultaneously, the positive pole of diode D2 meets the port C of the elementary winding of isolated switch transformer T1 by resistance R 10, meet IC ground GND_IC by resistance R 3 when the emitter of the controlled part U2B of optical coupling isolator connects the positive pole of diode D1 by resistance R 6, the negative pole of diode D1 connects the pin one of power management chip NCP1653 by resistance R 4; The pin one of power management chip NCP1653 also connects the pin 8 of power management chip NCP1653 successively by resistance R 4, resistance R 8; The positive pole of diode D3 meets the port E of isolated switch transformer T1 feedback winding, and the port F of isolated switch transformer T1 feedback winding meets IC ground GND_IC; The port C of the elementary winding of isolated switch transformer T1 connects the negative pole of diode D4, and the positive pole of diode D4 links to each other with the port D of the elementary winding of isolated switch transformer T1 by capacitor C 6; The positive pole of diode D4 links to each other by the negative pole that inductance L 1 meets diode D5, and the positive pole of diode D5 meets IC ground GND_IC; The port G of isolated switch transformer T1 secondary winding connects the positive pole of diode D6, and port H meets output ground GND_out; The negative pole of diode D6 meets output ground GND_out by capacitor C 10 on the one hand, on the other hand successively by meeting output ground GND_out after inductance L 3, the capacitor C 7; The tie point of inductance L 3 and capacitor C 7 meets output ground GND_out by resistance R 17, resistance R 18 on the one hand successively, connects the positive pole of optical coupling isolator control section U2A on the other hand by resistance R 15; The negative pole of optical coupling isolator control section U2A connects the collector electrode of triode Q2 and the negative pole of three terminal device TL431 simultaneously, and resistance R 16 is in parallel with optical coupling isolator control section U2A; The positive pole of three terminal device TL431 connects output ground GND_out, the control utmost point connecting resistance R17 of three terminal device TL431 and the tie point of resistance R 18; The emitter of triode Q2 meets output ground GND_out, and the base stage of triode Q2 links to each other with the collector electrode of triode Q2 by capacitor C 8 on the one hand, on the other hand successively by meeting output ground GND_out after resistance R 14, the resistance R 13;
Whole isolated formula general illumination LED drive circuit when work, as LED for illumination LED1, the LED2 of load ... the positive termination inductance L 3 after LED19, the LED20 series connection and the tie point of resistance R 15, the tie point of negative terminal connecting resistance R13 and resistance R 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100452906A CN101227779B (en) | 2008-01-29 | 2008-01-29 | Insulation type general use illumination LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100452906A CN101227779B (en) | 2008-01-29 | 2008-01-29 | Insulation type general use illumination LED driving circuit |
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| Publication Number | Publication Date |
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| CN101227779A CN101227779A (en) | 2008-07-23 |
| CN101227779B true CN101227779B (en) | 2011-10-05 |
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| CN2008100452906A Expired - Fee Related CN101227779B (en) | 2008-01-29 | 2008-01-29 | Insulation type general use illumination LED driving circuit |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102014540B (en) * | 2010-03-04 | 2011-12-28 | 凹凸电子（武汉）有限公司 | Drive circuit and controller for controlling electric power of light source |
| CN101873736B (en) * | 2009-04-24 | 2012-10-31 | 辉芒微电子（深圳）有限公司 | LED (light-emitting diode) drive circuit |
| CN101997310A (en) * | 2009-08-24 | 2011-03-30 | 深圳桑达国际电子器件有限公司 | Surge protection circuit and flyback power factor correction device |
| CN101765273B (en) * | 2010-01-22 | 2013-03-27 | 海洋王照明科技股份有限公司 | Stepless dimming LED drive circuit |
| CN102065600B (en) * | 2010-03-16 | 2014-06-25 | 成都芯源系统有限公司 | LED dimming driving system |
| TWI381625B (en) * | 2010-04-16 | 2013-01-01 | O2Micro Int Ltd | Circuits and controllers for driving light source |
| CN101873750B (en) * | 2010-06-25 | 2013-11-13 | 深圳市欣锐特科技有限公司 | LED (light emitting diode) lamp fault processing method, LED driver and LED lamp |
| CN101909391B (en) * | 2010-08-10 | 2013-07-31 | 浙江大学 | Phase-controlled dimming LED drive and driving method thereof |
| CN102083264A (en) * | 2011-03-10 | 2011-06-01 | 广东九联科技股份有限公司 | Novel LED (light emitting diode) lighting driving power supply |
| CN102570861B (en) * | 2011-12-30 | 2014-12-17 | 东南大学 | High-power-factor LED (Light Emitting Diode) constant-current driving power supply without electrolytic capacitor |
| TW201332396A (en) * | 2012-01-20 | 2013-08-01 | Phihong Technology Co Ltd | Power supply circuit for driving light emitting diode |
| CN103313453B (en) * | 2012-03-12 | 2017-02-01 | 海洋王照明科技股份有限公司 | LED constant current sampling circuit and LED lamp |
| CN103244881A (en) * | 2013-04-03 | 2013-08-14 | 天长市金陵电子有限责任公司 | Intelligent light control device of LED streetlamp |
| CN104378882A (en) * | 2014-11-13 | 2015-02-25 | 浙江点金照明有限公司 | Special 60 W driving power circuit for LED |
| CN105096840A (en) * | 2015-08-11 | 2015-11-25 | 京东方科技集团股份有限公司 | Backlight driving circuit, backlight driving method and display device |
| CN105491709B (en) * | 2015-12-21 | 2017-04-26 | 无锡中感微电子股份有限公司 | Sound control LED circuit |
| CN110856309B (en) * | 2019-11-22 | 2021-06-15 | 安徽乐图电子科技有限公司 | Multi-path LED driving circuit |
| CN113534879A (en) * | 2021-06-16 | 2021-10-22 | 常州高清信息技术有限公司 | Constant current source circuit |
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