CN101841959B - Drive circuit for load current of high-power controllable LED - Google Patents
Drive circuit for load current of high-power controllable LED Download PDFInfo
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- CN101841959B CN101841959B CN2010101643876A CN201010164387A CN101841959B CN 101841959 B CN101841959 B CN 101841959B CN 2010101643876 A CN2010101643876 A CN 2010101643876A CN 201010164387 A CN201010164387 A CN 201010164387A CN 101841959 B CN101841959 B CN 101841959B
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Abstract
The invention belongs to the power supply of an illumination light source, in particular to a drive circuit for the load current of a high-power controllable LED, which is characterized in that a signal sampling circuit, a photoelectric coupling isolation circuit and a protection circuit are electrically connected between a constant-current constant-voltage output circuit and a single-end flyback DC/DC power inverter in series, the signal sampling circuit controls an overcurrent, overvoltage, overtemperature and undervoltage protection circuit by the isolation of the photoelectric coupling isolation circuit after an overcurrent, overvoltage, overtemperature and undervoltage signal is amplified, the output of the single-end flyback DC/DC power inverter is regulated by the overcurrent, overvoltage, overtemperature and undervoltage protection circuit, and the constant-current constant-voltage output circuit outputs stable voltage and current. The invention provides the drive circuit for the load current of the high-power controllable LED, which has high power, high reliability and small change along with the factors of the input voltage, the temperature and the like.
Description
Technical field
The invention belongs to the drive circuit of the power supply of lighting source, particularly a kind of load current of high-power controllable LED.
Background technology
LE
DBe a kind of solid light source, when its two ends adds forward voltage, minority carrier in the semiconductor and majority carrier take place compound, and the excess energy of emitting will cause photo emissions.Adopt material different, can be made into the light-emitting diode of different colours.As a kind of new light source, each major company and research institution are in the ascendant to the research of LED in recent years, and its light efficiency is greatly improved, and Lumiled company has researched and developed and produced the White LED that light efficiency reaches 90Lm/W at present, have reached the level of incandescent lamp.
With comparing of incandescent lamp, LED has lot of advantages on performance:
See the following form:
The performance of table 1 incandescent lamp and White LED relatively
New light source is called new high-power LED drive circuit, and different with the electric ballast of fluorescent lamp, the major function of led drive circuit is to convert alternating voltage into constant-current supply, and the coupling of the voltage and current of completion simultaneously and LED.
In practice; Connection in series-parallel LED forming array is often adopted in load; This can make output current more remarkable with the variation that factors such as input voltage and ambient temperature take place, and array format or the variation of LED number, and current-limiting resistance is also answered respective change; So it is fixing to adopt the led drive circuit of this simple structure generally only to be suitable for driving array format, and lamp number less LED display.
The mathematical model of LED voltage-current characteristic can be represented with following formula
VF=Vturn-on+RsIF+（ΔVF/ΔT）（T-25℃）
Wherein, Vturn-on is the starting resistor of LED.
Rs representes the slope of volt-ampere curve.The T ambient temperature, Δ VF/ Δ T is the temperature coefficient of LED forward voltage, representative value is-2V/ ℃ for most LED.
See from volt-ampere curve and the mathematical model of LED, the great changes of the LED tiny change of its forward voltage behind forward conduction will causing LED electric current, and, ambient temperature, factors such as LED ageing time also will change the electric property that influences LED.And the output of the light of LED is directly relevant with the LED electric current; So led drive circuit is under the situation of factor changes such as input voltage and ambient temperature; The light output of LED will change with factors vary such as input voltage and temperature, and, if the LED electric current is out of control; The LED long-term work will influence reliability and the life-span of LED under big electric current, and might lose efficacy.
Summary of the invention
The purpose of this invention is to provide that a kind of power is big, reliability is high, with the drive circuit of the little load current of high-power controllable LED of factors vary such as input voltage and temperature.
The object of the invention is realized like this; A kind of drive circuit of load current of high-power controllable LED; At least comprise: EMC and surge current control circuit, a rectification and filter circuit, single-ended flyback DC/DC power inverter, secondary rectification and filter circuit and constant current, constant voltage outputting circuit; Constant current, constant voltage outputting circuit are connected with two electrode electricity of LED battle array example; It is characterized in that: be electrically connected in series signal sample circuit, photoelectricity coupling buffer circuit and protective circuit between constant current, constant voltage outputting circuit and the single-ended flyback DC/DC power inverter; Signal sample circuit with overcurrent, overvoltage, overheated and under-voltage signal through processing and amplifying after photoelectricity coupling buffer circuit isolated controlling overcurrent, overvoltage, overheated and under-voltage protecting circuit; Through overcurrent, overvoltage, overheated and under-voltage protecting circuit adjustment single-ended flyback DC/DC power inverter output, make constant current, the stable voltage and current of constant voltage outputting circuit output.
Described single-ended flyback DC/DC power inverter is the wide dynamic range isolated form; It comprises the voltage stabilizing circuit that voltage-stabiliser tube P6KE200A and diode IN4007 constitute; Transformer T2 and TOP245 and peripheral circuit; Convert the low pressure high frequency to by transformer T2 and TOP245 and the peripheral circuit high pressure low frequency that transformer T2 is elementary, the secondary of transformer T2 comprises two groups, and one group offers the load led array through secondary rectification and filter circuit rectification and filtering; Another group is the voltage sample output, and voltage sample output and IN4148/ES1D, ZMM5243B-7 and capacitor C 9 constitute overcurrent, overvoltage, overheated and under-voltage signal sample circuit.
Described voltage sample output one end arrives negative supply through IN4148/ES1D and capacitor C 9, and the other end directly arrives negative supply.
The output end of pressure-stabilizing of described IN4148/ES1D is connected with the positive terminal of electrochemical capacitor C9; Its link is input to the control end C of TOP245 behind ZMM5243B-7 and resistance; Feed back to the control end C of TOP245 through the output of voltage sample coil, regulate the frequency of oscillation of transformer T2 by TOP245.
Have less than the resistance of 10 Ω and the electrochemical capacitor that is connected in series between the control end C of described TOP245 and the negative supply.
The in-phase end of first group of coil of a described rectification and filter circuit output and transformer T2 is connected with capacitor C 4, and C4 selects 2.2nF/1kV for use.
Advantage of the present invention is: because the present invention has introduced voltage or Current Feedback Control link.The user can change load led array form and LED number as required, obtains different power outputs.This drive circuit has also overcome the drawbacks such as the easy change of color that make LED light because of factors such as input voltage, ambient temperatures simultaneously; Power factor reaches more than 0.9; THD can accomplish below 20%; Life-span can reach more than 50000 hours, also can accomplish from 100% to 1% dimming function simultaneously, and these series of products also possessed overvoltage and overcurrent protection function.
Description of drawings
Below in conjunction with the embodiment accompanying drawing the present invention is described further:
Fig. 1 is an embodiment of the invention schematic block circuit diagram;
Fig. 2 is an embodiment of the invention circuit diagram;
Fig. 3 is EMC and surge current control circuit figure.
Among the figure: 1, AC220V input; 2, EMC and surge current control circuit; 3, a rectification and filter circuit; 4, single-ended flyback DC/DC power inverter; 5, secondary rectification and filter circuit; 6, constant current, constant voltage outputting circuit; 7, led array; 8, sample circuit; 9, photoelectricity coupling buffer circuit; 10, protective circuit.
Embodiment
As shown in Figure 1; A kind of drive circuit of load current of high-power controllable LED; It is characterized in that: a kind of drive circuit of load current of high-power controllable LED; At least comprise: EMC and surge current control circuit 2, a rectification and filter circuit 3, single-ended flyback DC/DC power inverter 4, secondary rectification and filter circuit 5 and constant current, constant voltage outputting circuit 6; Constant current, constant voltage outputting circuit 6 are connected with two electrode electricity of led array 7; It is characterized in that: be connected with overcurrent, overvoltage, overheated and under-voltage signal sample circuit 8, photoelectricity coupling buffer circuit 9 and overcurrent, overvoltage, overheated and under-voltage protecting circuit 10 between constant current, constant voltage outputting circuit 6 and the single-ended flyback DC/DC power inverter 4; Overcurrent, overvoltage, overheated and under-voltage signal sample circuit 8 with overcurrent, overvoltage, overheated and under-voltage signal through processing and amplifying after photoelectricity coupling buffer circuit 9 isolated controlling overcurrents, overvoltage, overheated and under-voltage protecting circuit 10; Through overcurrent, overvoltage, overheated and under-voltage protecting circuit 10 adjustment single-ended flyback DC/DC power inverters 4 outputs, make constant current, the stable voltage and current of constant voltage outputting circuit 6 outputs.
As shown in Figure 2; Single-ended flyback DC/DC power inverter 4 is wide dynamic range isolated forms; It comprises the voltage stabilizing circuit that voltage-stabiliser tube P6KE200A and diode FR103, BYV29-400, current-limiting resistance R5 constitute; And the high-frequency coupling circuit, the output of voltage stabilizing circuit is carried in the input of transformer T1.The high-frequency coupling circuit is made up of transformer T1 and TOP245 and peripheral circuit; Transformer T1 and TOP245 and peripheral circuit convert the high pressure low frequency of transformer T1 prime to the low pressure high frequency; The secondary of transformer T1 comprises two groups; One group offers constant current, constant voltage outputting circuit 6 through secondary rectification and filter circuit 5 rectifications and filtering, and constant current, constant voltage outputting circuit 6 resupply load led array 7.Another is organized end of the same name and arrives negative supply through IN4148/ES1D and capacitor C 10, and the different name end is to negative supply.The output end of pressure-stabilizing of IN4148/ES1D is connected with the positive terminal of electrochemical capacitor C10, and its link is connected with photoelectricity coupling buffer circuit 9 outputs, through photoelectricity coupling buffer circuit 9 and the control end C of IN4148 to TOP245.The control end C change in voltage of TOP245 directly influences the D end frequency of oscillation of TOP243.Therefore, the electric current that electric current, change in voltage or the environment that is caused by load causes, change in voltage feed back to the control end C of TOP245 through the output of voltage sample coil, the stabilized input voltage of control end C, and then D end frequency of oscillation is stable.Therefore, the input terminal voltage of photoelectricity coupling buffer circuit 9 also affects the output of D end frequency of oscillation simultaneously.
Overcurrent, overvoltage, overheated and under-voltage signal sample circuit 8 comprise: (PNP) triode 2N3906V2, diode RF107 and a resistance capacitance; The end of the same name that transformer T1 offers one group of secondary output of load LED divides two-way through diode RF107; One the tunnel is electrically connected with the emitter of triode 2N3906V2; Another road is through resistance R 12, the R13 base stage to triode 2N3906V2; The electrochemical capacitor of resistance R 12, R13 electric connection point warp 47 μ F is to negative supply, and the collector electrode of triode 2N3906V2 arrives the input negative terminal of photoelectricity coupling buffer circuit 9 simultaneously through the input anode of current-limiting resistance R14 to photoelectricity coupling buffer circuit 9 through a resistance R 24.
Among the present invention, the output of transformer T1 offers constant current, constant voltage outputting circuit 6, constant current, constant voltage outputting circuit 6 direct supply load led array through secondary rectification and filter circuit 5 rectifications and filtering.And the load variations of led array can influence constant current, constant voltage outputting circuit 6 equally; Therefore; After constant current, constant voltage outputting circuit 6 pass through overcurrent, overvoltage, overheated and under-voltage signal sample circuit 8; Its signal with load variations is input to the input of photoelectricity coupling buffer circuit 9, and the control end C that feeds back to TOP245 through photoelectricity coupling buffer circuit 9 then realizes transformer T1 FREQUENCY CONTROL.Finally reach the burning voltage and the electric current that offer load LED.
Constant current, constant voltage outputting circuit 6 comprise two (NPN) triode 2N3904, (PNP) triode 2N3906V3 and resistance capacitance; Constitute the collector electrode output circuit by a triode 2N3904 and resistance R 15, R16; Resistance R 15, R16 are connected in series as the collector load resistor of collector electrode output circuit; Collector electrode output circuit anode and negative terminal connect secondary rectification and filter circuit 5 anodes and negative terminal output respectively; Resistance R 15, R16 are connected in series and a little are electrically connected with the base stage of triode 2N3906 (PNP) V5, and the emitter of 2N3906 (PNP) V5 connects secondary rectification and filter circuit 5 anodes through resistance R 20, and the collector electrode of 2N3906 (PNP) divides three the tunnel; Wherein leading up to resistance and a voltage-stabiliser tube connects secondary rectification and filter circuit 5 anodes, and another road is electrically connected with the input anode of photoelectricity coupling buffer circuit 9.The collector electrode Third Road of 2N3906 (PNP) is through 22 fens two-way of resistance R; The resistance R 23 of leading up to is electrically connected with the base stage of collector electrode output circuit; Another road is electrically connected with the base stage of another triode 2N3904 (NPN) V4; The collector electrode of V4 is electrically connected with the base stage of V3, and the emission of V4 is hit the utmost point and connect negative supply through three resistance that are connected in parallel.
Photoelectricity coupling circuit among the present invention in the photoelectricity coupling buffer circuit 9 adopts LTV817A; The emitter and collector of LTV817A output stage triode is electrically connected with triode 2N390 base stage and collector electrode respectively, and the emitter of triode 2N390 is through the control end C of diode to TOP245.A rectification and filter circuit 3 exchange the 220V of AC220V input 1 and become direct current, for EMC and the surge current that prevents that AC220V input 1 from producing, and adding EMC and surge current control circuit 2 before a rectification and filter circuit 3.
Because TOP245 is an integrated circuit, and reliable performance is arranged.Therefore, can guarantee effectively that the electric current of supply load led array and voltage are stabilized on the set point that needs.
Its output current voltage of the circuit that provides among Fig. 2 is: 24V/3A.Power supply indicator is through LM358 rear drive indicator light.
Fig. 3 has provided the physical circuit of AC220V input 1, EMC and surge current control circuit 2, and the output of EMC and surge current control circuit 2 is electrically connected with the input of single-ended flyback DC/DC power inverter 4 through a rectification and filter circuit 3.Because EMC and surge current control circuit 2 and a rectification and filter circuit 3 belong to the technology that most of circuit adopt, therefore, the refinement explanation is not done in too much explanation.
Claims (2)
1. the drive circuit of a load current of high-power controllable LED; At least comprise: EMC and surge current control circuit (2), a rectification and filter circuit (3), single-ended flyback DC/DC power inverter (4), secondary rectification and filter circuit (5) and constant current, constant voltage outputting circuit (6); Constant current, constant voltage outputting circuit (6) are connected with two electrode electricity of led array (7); It is characterized in that: be electrically connected in series overcurrent, overvoltage, overheated and under-voltage signal sample circuit (8), photoelectricity coupling buffer circuit (9) and protective circuit (10) between constant current, constant voltage outputting circuit (6) and the single-ended flyback DC/DC power inverter (4); Signal sample circuit (8) with overcurrent, overvoltage, overheated and under-voltage signal through processing and amplifying after photoelectricity coupling buffer circuit (9) isolated controlling overcurrent, overvoltage, overheated and under-voltage protecting circuit (10); Through overcurrent, overvoltage, overheated and under-voltage protecting circuit (10) adjustment single-ended flyback DC/DC power inverter (4) output, make constant current, the stable voltage and current of constant voltage outputting circuit (6) output; Described single-ended flyback DC/DC power inverter (4) is the wide dynamic range isolated form; It comprises the voltage stabilizing circuit that voltage-stabiliser tube P6KE200A and diode FR103, BYV29-400, current-limiting resistance R5 constitute; And high-frequency coupling circuit; The output of voltage stabilizing circuit is carried in the input of transformer T1, and the high-frequency coupling circuit is made up of transformer T1 and TOP245 and peripheral circuit, and transformer T1 and TOP245 and peripheral circuit convert the high pressure low frequency of transformer T1 prime to the low pressure high frequency; The secondary of transformer T1 comprises two groups; One group offers constant current, constant voltage outputting circuit (6) through secondary rectification and filter circuit (5) rectification and filtering, and constant current, constant voltage outputting circuit (6) resupply load led array (7), another organize end of the same name through IN4148/ES1D and capacitor C 10 to negative supply; The different name end is to negative supply; The output end of pressure-stabilizing of IN4148/ES1D is connected with the positive terminal of electrochemical capacitor C10, and its link and photoelectricity coupling buffer circuit (9) output is connected, through photoelectricity buffer circuit (9) and the IN4148 control end C to TOP245 that is coupled; Described overcurrent, overvoltage, overheated and under-voltage signal sample circuit (8) comprising: PNP triode 2N3906V2, diode RF107 and a resistance capacitance; The end of the same name that transformer T1 offers one group of secondary output of load LED divides two-way through diode RF107; One the tunnel is electrically connected with the emitter of triode 2N3906V2; Another road is through resistance R 12, the R13 base stage to triode 2N3906V2; The electrochemical capacitor of resistance R 12, R13 electric connection point warp 47 μ F is to negative supply; The collector electrode of triode 2N3906V2 is through the input anode of current-limiting resistance R14 to photoelectricity coupling buffer circuit (9), simultaneously through the input negative terminal of a resistance R 24 to photoelectricity coupling buffer circuit (9); Described constant current, constant voltage outputting circuit (6) comprise two NPN triode 2N3904, PNP triode 2N3906V3 and resistance capacitance; Constitute the collector electrode output circuit by a NPN triode 2N3904 and resistance R 15, R16; Resistance R 15, R16 are connected in series as the collector load resistor of collector electrode output circuit; Collector electrode output circuit anode and negative terminal connect secondary rectification and filter circuit (5) anode and negative terminal output respectively; Resistance R 15, R16 are connected in series and a little are electrically connected with the base stage of PNP triode 2N3906 V5; The emitter of 2N3906 V5 connects secondary rectification and filter circuit (5) anode through resistance R 20; The collector electrode of PNP triode 2N3906 divides three the tunnel, wherein leads up to resistance and a voltage-stabiliser tube to connect secondary rectification and filter circuit (5) anode, and another road is electrically connected with the input anode of photoelectricity coupling buffer circuit (9); The collector electrode Third Road of PNP triode 2N3906 is through 22 fens two-way of resistance R; The resistance R 23 of leading up to is electrically connected with the base stage of collector electrode output circuit; Another road is electrically connected with the base stage of another NPN triode 2N3904 V4; The collector electrode of V4 is electrically connected with the base stage of V3, and the emitter of V4 connects negative supply through three resistance that are connected in parallel.
2. the drive circuit of a kind of load current of high-power controllable LED according to claim 1; It is characterized in that: the photoelectricity coupling circuit in the described photoelectricity coupling buffer circuit (9) adopts LTV817A; The emitter and collector of LTV817A output stage triode is electrically connected with triode 2N390 base stage and collector electrode respectively, and the emitter of triode 2N390 is through the control end C of diode to TOP245.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101643876A CN101841959B (en) | 2010-05-06 | 2010-05-06 | Drive circuit for load current of high-power controllable LED |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101643876A CN101841959B (en) | 2010-05-06 | 2010-05-06 | Drive circuit for load current of high-power controllable LED |
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| CN101841959A CN101841959A (en) | 2010-09-22 |
| CN101841959B true CN101841959B (en) | 2012-11-14 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207255A (en) * | 2011-06-21 | 2011-10-05 | 陈卫平 | LED lamp for replacing compact fluorescent lamp |
| CN102355763A (en) * | 2011-06-28 | 2012-02-15 | 中山市锐盈电子有限公司 | Ladder temperature protection compensation system of LED driven power source |
| CN102315679B (en) * | 2011-09-01 | 2014-07-09 | 河南省交通科学技术研究院有限公司 | Rapid charging circuit with protection circuit |
| CN106900118A (en) * | 2013-09-29 | 2017-06-27 | 赛尔富电子有限公司 | A kind of under-voltage protecting circuit for LED lamp |
| CN110837044A (en) * | 2019-10-14 | 2020-02-25 | 中国北方发动机研究所(天津) | Hybrid power motor driving frequency voltage detection circuit |
| WO2022099483A1 (en) * | 2020-11-10 | 2022-05-19 | 深圳市豪恩智能物联股份有限公司 | Illumination driver power source circuit, illumination driver apparatus, and lamp tube |
| CN114340087A (en) * | 2021-12-31 | 2022-04-12 | 无锡拓朴微电子有限公司 | Three-phase intelligent ultra-high-power constant current driving circuit and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201127137Y (en) * | 2007-12-17 | 2008-10-01 | 宁波市鄞州威迪电子有限公司 | High-power LED drive circuit |
| CN201409247Y (en) * | 2009-05-21 | 2010-02-17 | 宁波升谱光电半导体有限公司 | Driving circuit of LED (Light-Emitting Diode) lamp |
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2010
- 2010-05-06 CN CN2010101643876A patent/CN101841959B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201127137Y (en) * | 2007-12-17 | 2008-10-01 | 宁波市鄞州威迪电子有限公司 | High-power LED drive circuit |
| CN201409247Y (en) * | 2009-05-21 | 2010-02-17 | 宁波升谱光电半导体有限公司 | Driving circuit of LED (Light-Emitting Diode) lamp |
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Owner name: NINGBO LONGYUAN ILLUMINATE APPLIANCE CO., LTD. Free format text: FORMER NAME: NINGBO YINZHOU LONGYUAN ILLUMINATE APPLIANCE CO., LTD. |
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Address after: Yinzhou Qiuai town private industrial zone 315101 Zhejiang city of Ningbo province (Ningbo Longyuan Lighting Electrical Appliance Co., Ltd.) Patentee after: NINGBO LONGYUAN ILLUMINATE APPLIANCE CO.,LTD. Address before: Private Industrial Park Yinzhou District Qiuai town Zhejiang city Ningbo province 315101 Patentee before: Ningbo Yinzhou Longyuan Illuminate Appliance Co.,Ltd. |
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Granted publication date: 20121114 |