CN103945610A - High-speed pulsation constant current LED driving power circuit - Google Patents
High-speed pulsation constant current LED driving power circuit Download PDFInfo
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- CN103945610A CN103945610A CN201410161844.4A CN201410161844A CN103945610A CN 103945610 A CN103945610 A CN 103945610A CN 201410161844 A CN201410161844 A CN 201410161844A CN 103945610 A CN103945610 A CN 103945610A
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Abstract
The invention provides a high-speed pulsation constant current LED driving power circuit. The high-speed pulsation constant current LED driving power circuit comprises a rectifying circuit. The output end of the rectifying circuit is connected with a node N1. One end of a resistor R1 is connected with the node N1, and the other end of the resistor R1 is connected with one end of a resistor R5 and one end of a resistor R2. The other end of the resistor R2 is connected to the ground. The other end of the resistor R5 is connected with the base electrode of an NPN triode Q4. One end of a resistor R8 is connected with the node N1, and the other end of the resistor R8 is connected with a node N4. The collector electrode of the NPN triode Q4 is connected with the node N4, and the emitting electrode of the NPN triode Q4 is connected to the ground. The collector electrode of an NPN triode R3 is connected with the node N4, the emitting electrode of the NPN triode Q3 is connected to the ground, and the base electrode of the NPN triode Q3 is connected with one end of a resistor R4. The base electrode of an NPN triode Q1 is connected with the node N4, the collector electrode of the NPN triode Q1 is connected with a node N2, and the emitting electrode of the NPN triode Q1 is connected with the base electrode of an NPN triode Q2. The collector electrode of the NPN triode Q2 is connected with the collector electrode of the NPN triode Q1, and the emitting electrode of the NPN triode Q2 is connected with a node N3. The other end of the resistor R4 is connected with the node N3. One end of a resistor R6 is connected with the node N3, and the other end of the resistor R6 is connected to the ground. The high-speed driving circuit with power automatic protection is long in service life.
Description
Technical field
The present invention relates to a kind of LED drive circuit, control and the high speed pulsation constant current LED driving power source circuit of transducer control by overpower for especially a kind of having of being comprised of high-tension electricity flow pattern device.
Background technology
In the prior art at present, the scheme of linear constant current mains lighting supply is generally to adopt current regulator diode (CRD) mode or by take MOS device as the main constant current integrated circuit (CCR) forming, current regulator diode current capacity is little and size of current is non-adjustable, cannot carry out temperature protection, the people of application is fewer and feweri simultaneously; The constant current integrated circuit being comprised of MOS device is owing to adopting high-voltage MOS pipe as power device; its switching speed is very slow; and grid source puncture voltage is very low; voltage/current impacts when solving switch; need to increase a lot of protection devices and complicated circuit design; thereby increased cost, and existing scheme does not generally possess overpower protection control function in addition, and when line voltage is very high, LED or power unit cause overheated easily damage because power is excessive.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art; the automatically LED driving power circuit of protection and transducer control of large electric current hyper tape power of a kind of long-life is provided, has solved original switching speed problem of take the linear LED illumination driver that high pressure VDMOS is core and increased therefrom the weakness of many protection devices.The technical solution used in the present invention is:
A high speed pulsation constant current LED driving power source circuit, comprising: a rectification circuit, is converted to direct current output, the output connected node N1 of rectification circuit by alternating current; One terminated nodes N1 of resistance R 1, one end of other end connecting resistance R5 and one end of resistance R 2; The other end ground connection of resistance R 2; The base stage of another termination NPN triode Q4 of resistance R 5; One terminated nodes N1 of resistance R 8, another terminated nodes N4; The collector electrode of NPN triode Q4 connects node N4, grounded emitter; The collector electrode of NPN triode Q3 meets node N4, grounded emitter, one end of base stage connecting resistance R4; The base stage of NPN triode Q1 meets node N4, and collector electrode meets node N2, and emitter connects the base stage of NPN triode Q2; The collector electrode of Q2 connects the collector electrode of Q1, and emitter meets node N3; Another terminated nodes N3 of resistance R 4; One terminated nodes N3 of resistance R 6, other end ground connection; Node N1 is used for being connected LED illuminating device with node N2.
Preferably, described high speed pulsation constant current LED driving power source circuit, also comprises a transducer control section, and transducer control section comprises resistance R 3 and NPN triode Q5; One end of resistance R 3 is used for connecing control signal, the base stage of another termination Q5; The collector electrode of Q5 connects node N4, grounded emitter.
Alternatively, described NPN triode Q3 and resistance R 4 are replaced by a voltage-stabiliser tube Z1, and the negative electrode of Z1 connects node N4, plus earth.
Further, the withstand voltage of NPN triode Q1 and Q2 is 400 ~ 1500v.
Further, NPN triode Q1 and Q2 are replaced by an IGBT pipe.
Advantage of the present invention: the present invention has used the core of superhigh pressure Darlington transistor as high-power drive circuit, impressed current control circuit and sensing control circuit have formed the LED illumination driving circuit scheme of high performance-price ratio, it has comprised superhigh pressure Darlington transistor as power drive device, contain the pulsation needed sampling of constant current and feedback circuit simultaneously, contain overvoltage, overpower sampling and control circuit and sensing control end simultaneously.Because contain overpower or overvoltage control circuit, overcome traditional constant current LED drive circuit problem that under high pressure whole illuminator power raises and increases with operating voltage, contain transducer control end simultaneously, can be for intelligent LED lighting field, this programme does not contain electrochemical capacitor and inductance, long working life.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram in embodiments of the invention one.
Fig. 2 is the electrical schematic diagram in embodiments of the invention two.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
Embodiment mono-.
The high speed pulsation constant-current LED illumination driving circuit with overpower control function being comprised of current mode device that the present embodiment proposes, as shown in Figure 1, comprising:
One rectification circuit, rectification circuit can adopt common full bridge rectifier, for alternating current being converted to direct current output, the output connected node N1 of rectification circuit; One terminated nodes N1 of resistance R 1, one end of other end connecting resistance R5 and one end of resistance R 2; The other end ground connection of resistance R 2; The base stage of another termination NPN triode Q4 of resistance R 5; One terminated nodes N1 of resistance R 8, another terminated nodes N4; The collector electrode of NPN triode Q4 connects node N4, grounded emitter; The collector electrode of NPN triode Q3 meets node N4, grounded emitter, one end of base stage connecting resistance R4; The base stage of NPN triode Q1 meets node N4, and collector electrode meets node N2, and emitter connects the base stage of NPN triode Q2; The collector electrode of Q2 connects the collector electrode of Q1, and emitter meets node N3; Another terminated nodes N3 of resistance R 4; One terminated nodes N3 of resistance R 6, other end ground connection; Node N1 is used for being connected LED illuminating device with node N2.
One end of resistance R 3 is used for connecing control signal Sin, the base stage of another termination NPN triode Q5; The collector electrode of Q5 connects node N4, grounded emitter.
In foregoing circuit structure, overvoltage or overpower protection partly comprise resistance R 1, R2, R5 and NPN triode Q4.The biasing resistor that resistance R 1 is Q4, R2 is supply power voltage sample resistance, and R5 is base stage current-limiting resistance, and triode Q4 is the amplifying device of overvoltage or overpower protection part.When external voltage raises, the collector potential of Q4 can be dragged down, thereby offsets the rising of Q1 base potential.
Resistance R 3 and triode Q5 form transducer control section, and when Sin end is high level, Q1 base potential is dragged down, and LED brightness of illumination weakens or extinguishes.Sin is control signal or other control signal of transducer output.
Triode Q1 and Q2 form the Darlington current mode amplifying device of high-power, as the power drive part of LED lighting circuit.The withstand voltage value of triode Q1 and Q2 is 150V ~ 1500v, such as 400v.
Triode Q3, resistance R 4 and resistance R 6 form current sampling and feedback amplifier section.When the drive current of LED becomes large, by the negative feedback of Q3, can drag down Q1 base potential, offset the rising of LED drive current.
The high-power darlington structure that Q1 and Q2 form also can replace with an IGBT pipe (insulated gate bipolar transistor).Resistance R 1 value 10k ~ 2M Ω.Resistance R 2 value 100 Ω ~ 10k Ω.Resistance R 3 value 100 Ω ~ 100k Ω.Resistance R 4 value 100 Ω ~ 100k Ω.Resistance R 5 value 100 Ω ~ 100k Ω.Resistance R 6 value 0.1 Ω ~ 1k Ω.
Embodiment bis-.
Basically identical in the high speed pulsation constant-current LED illumination driving circuit with overpower control function being comprised of current mode device in embodiment bis-and embodiment mono-, just current sampling and feedback amplifier section are different.As shown in Figure 2, NPN triode Q3 and resistance R 4 are replaced by a voltage-stabiliser tube Z1, and the negative electrode of Z1 connects node N4, plus earth.Voltage-stabiliser tube Z1 can stablize the base voltage of Q1, thereby when external voltage raises, can stablize the output current of Q1, Q2.
Voltage-stabiliser tube Z1, resistance R 16 form current sampling and feedback amplifier section.
In the present embodiment, the high-power darlington structure that Q1 and Q2 form also can replace with an IGBT pipe (insulated gate bipolar transistor).
Claims (7)
1. the high speed constant current LED driving power source circuit of pulsing, is characterized in that, comprising:
One rectification circuit, is converted to direct current output, the output connected node N1 of rectification circuit by alternating current; One terminated nodes N1 of resistance R 1, one end of other end connecting resistance R5 and one end of resistance R 2; The other end ground connection of resistance R 2; The base stage of another termination NPN triode Q4 of resistance R 5; One terminated nodes N1 of resistance R 8, another terminated nodes N4; The collector electrode of NPN triode Q4 connects node N4, grounded emitter; The collector electrode of NPN triode Q3 meets node N4, grounded emitter, one end of base stage connecting resistance R4; The base stage of NPN triode Q1 meets node N4, and collector electrode meets node N2, and emitter connects the base stage of NPN triode Q2; The collector electrode of Q2 connects the collector electrode of Q1, and emitter meets node N3; Another terminated nodes N3 of resistance R 4; One terminated nodes N3 of resistance R 6, other end ground connection;
Node N1 is used for being connected LED illuminating device with node N2.
2. high speed pulsation constant current LED driving power source circuit as claimed in claim 1, is characterized in that, also comprise a transducer control section, transducer control section comprises resistance R 3 and NPN triode Q5;
One end of resistance R 3 is used for connecing control signal, the base stage of another termination Q5; The collector electrode of Q5 connects node N4, grounded emitter.
3. high speed as claimed in claim 1 or 2 pulsation constant current LED driving power source circuit, is characterized in that:
Described NPN triode Q3 and resistance R 4 are replaced by a voltage-stabiliser tube Z1, and the negative electrode of Z1 connects node N4, plus earth.
4. high speed as claimed in claim 1 or 2 pulsation constant current LED driving power source circuit, is characterized in that:
The withstand voltage of NPN triode Q1 and Q2 is 150V ~ 1500v.
5. high speed as claimed in claim 3 pulsation constant current LED driving power source circuit, is characterized in that:
The withstand voltage of NPN triode Q1 and Q2 is 150V ~ 1500v.
6. high speed as claimed in claim 1 or 2 pulsation constant current LED driving power source circuit, is characterized in that:
NPN triode Q1 and Q2 are replaced by an IGBT pipe.
7. high speed as claimed in claim 3 pulsation constant current LED driving power source circuit, is characterized in that:
NPN triode Q1 and Q2 are replaced by an IGBT pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161844.4A CN103945610A (en) | 2014-04-21 | 2014-04-21 | High-speed pulsation constant current LED driving power circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161844.4A CN103945610A (en) | 2014-04-21 | 2014-04-21 | High-speed pulsation constant current LED driving power circuit |
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| CN103945610A true CN103945610A (en) | 2014-07-23 |
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| CN201410161844.4A Pending CN103945610A (en) | 2014-04-21 | 2014-04-21 | High-speed pulsation constant current LED driving power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107155245A (en) * | 2017-07-21 | 2017-09-12 | 无锡市永晶光电科技有限公司 | The linear invariable power LED drive integrated circults in three-temperature-zone |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170735A (en) * | 2011-06-10 | 2011-08-31 | 林万炯 | Dimming circuit of high-power LED (Light-emitting Diode) lamp |
| CN102333403A (en) * | 2011-06-29 | 2012-01-25 | 林万炯 | Protection circuit for preventing LED from impact |
| CN202435681U (en) * | 2012-01-09 | 2012-09-12 | 杭州鸿德照明科技有限公司 | Wide voltage input linear constant current LED (Light-Emitting Diode) driving circuit |
| US20120299495A1 (en) * | 2011-05-24 | 2012-11-29 | Nichia Corporation | Light-emitting diode driving apparatus including charging/discharging capacitor |
-
2014
- 2014-04-21 CN CN201410161844.4A patent/CN103945610A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120299495A1 (en) * | 2011-05-24 | 2012-11-29 | Nichia Corporation | Light-emitting diode driving apparatus including charging/discharging capacitor |
| CN102170735A (en) * | 2011-06-10 | 2011-08-31 | 林万炯 | Dimming circuit of high-power LED (Light-emitting Diode) lamp |
| CN102333403A (en) * | 2011-06-29 | 2012-01-25 | 林万炯 | Protection circuit for preventing LED from impact |
| CN202435681U (en) * | 2012-01-09 | 2012-09-12 | 杭州鸿德照明科技有限公司 | Wide voltage input linear constant current LED (Light-Emitting Diode) driving circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107155245A (en) * | 2017-07-21 | 2017-09-12 | 无锡市永晶光电科技有限公司 | The linear invariable power LED drive integrated circults in three-temperature-zone |
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Application publication date: 20140723 |