CN103369792A - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN103369792A CN103369792A CN2013102963108A CN201310296310A CN103369792A CN 103369792 A CN103369792 A CN 103369792A CN 2013102963108 A CN2013102963108 A CN 2013102963108A CN 201310296310 A CN201310296310 A CN 201310296310A CN 103369792 A CN103369792 A CN 103369792A
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Abstract
The invention discloses an LED drive circuit. A power source Ui is connected with two alternating current input ports of a rectification and filter circuit through a safety resistor R1 and an X capacitor C1, wherein the rectification and filter circuit is formed by a diode D1, a diode D2, a diode D3 and a diode D4. A capacitor C2 is connected between a rectification output positive pole and a rectification output negative pole of the rectification and filter circuit. A collector of an audion Q1 is connected with an output positive pole of the rectification and filter circuit, an emitter of the audion Q1 is connected with a collector of an audion Q2 through a biasing resistor R4, an emitter of the audion Q2 is connected with an output negative pole of the rectification and filter circuit through a biasing resistor R5, a diode D5 and a diode D6 are connected between a base of the audion Q1 and a base of the audion Q2, and between the collector of the audion Q1 and the collector of the audion Q2 respectively, a resistor R2 and a resistor R3 are connected in series, the resistor R2 is connected with the output positive pole of the rectification and filter circuit, and the resistor R3 is connected with the base of the audion Q2. According to the LED drive circuit, control over drive current can be achieved while an expensive IC is not needed; the circuit is simple and reliable and low in cost; discrete components are adopted, therefore, thermal loss is dispersed, and the circuit will be more stable; component diameters are arranged reasonably, and therefore power consumption is lower than that of the IC.
Description
Technical field
The present invention relates to the LED technical field, relate in particular to a kind of led drive circuit.
Background technology
Along with improving constantly of light efficiency, LED has obtained huge development as lighting source in recent years, with respect to incandescent lamp, the drive circuit complexity of LED many, adopt the IC circuit to finish complicated function more, its cost is also high.
Summary of the invention
The object of the invention is exactly in order to remedy the defective of prior art, a kind of led drive circuit to be provided.
The present invention is achieved by the following technical solutions:
A kind of led drive circuit, power supply Ui is connected connection by diode D1 by insurance resistance R 1 with the X capacitor C, D2, two ac input end mouths of the current rectifying and wave filtering circuit that D3 and D4 form, connect capacitor C 2 between the rectification output cathode of current rectifying and wave filtering circuit and the output negative pole, the collector electrode of triode Q1 connects the output cathode of current rectifying and wave filtering circuit, the emitter of triode Q1 is connected with the collector electrode of triode Q2 by biasing resistor R4, the emitter of triode Q2 connects the output negative pole of current rectifying and wave filtering circuit by biasing resistor R5, be connected with respectively diode D5 and diode D6 between the base stage of triode Q1 and triode Q2 and the emitter, resistance R 2 and resistance R 3 series connection, the output cathode of resistance R 2 and current rectifying and wave filtering circuit, resistance R 3 is connected with the base stage of triode Q2, the collector electrode of the connecting line of resistance R 2 and resistance R 3 and triode Q2 has node, capacitor C 3 is connected in parallel with resistance R 2, triode Q1 is connected base stage and is connected respectively biasing resistor R6 and biasing resistor R7 with triode Q2, biasing resistor R6 is connected collector electrode and is connected respectively the input of the first coil T11 of magnetic ring transformer T1 with triode Q2, biasing resistor R7 is connected emitter and is connected respectively the input of the second coil T12 of magnetic ring transformer T1 with triode Q2, and also be connected with capacitor C 4 between the input of the second coil T12 of the emitter of triode Q2 and magnetic ring transformer T1, the secondary output of magnetic ring transformer T1 connects by diode D7 by current-limiting inductance L1, D8, the second ac input end of the bridge rectifier that D9 and D10 form, the collector electrode of triode Q1 connects the first ac input end of described bridge rectifier by capacitor C 5, current-limiting inductance L1 and capacitor C 5 form the LC series resonant circuit, are parallel with successively capacitor C 6 between the output cathode of bridge rectifier and the output negative pole, diode (LED) is issued in the load of bleeder resistance R8 and a plurality of series connection.
The course of work is: after circuit powers up, current rectifying and wave filtering circuit provides dc bus voltage for circuit, at first by resistance R 2, R3 injects base current to triode Q2, triode Q2 conducting, because the induced electromotive force of magnetic ring transformer T1 makes base stage obtain positive feedback, triode Q2 accelerates conducting to saturated, load current flowed to and was this moment: bus voltage positive pole → C5 → D7 → LED → D10 → L1 → Q2 → R5 → negative pole (), magnetic ring transformer T1 is saturated gradually simultaneously, induced electromotive force descends, triode Q2 base current is reduced gradually, simultaneously capacitor C 4 triode Q2 positive feedback conduction period fill voltage, oppositely be added on the substrate of triode Q2, it is withdrawed from gradually saturated, magnetic ring transformer T1 feedback continuation effect makes its rapid cut-off, and triode Q1 is then because the induced electromotive force conducting of magnetic ring transformer T1 simultaneously, saturated rapidly under positive feedback effect, at this moment the flow direction of electric current is: positive source → Q1 → R4 → L1 → D9 → LED → D8 → C5 → positive pole.Like this triode Q1, Q2 alternate conduction, the circuit starting of oscillation.Capacitor C 3 plays the afterflow effect in the neutral gear phase that switching tube replaces, after the circuit starting of oscillation, AC energy provides drive current to LED after by the rectification of diode D8-D11 bridge circuit in the resonant circuit, because the voltage-current characteristic of load, after LED lights, carry out chokes by current-limiting inductance L1.
Advantage of the present invention is: the present invention does not need expensive integrated IC, equally realizes the control of drive current, and circuit is simple and reliable, cost is low, adopts discrete component, and thermal losses disperses, circuit is more stable, and component parameter rationally is set, and can make power consumption be lower than the IC circuit.
Description of drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of led drive circuit, power supply Ui is connected connection by diode D1 by insurance resistance R 1 with the X capacitor C, D2, two ac input end mouths of the current rectifying and wave filtering circuit that D3 and D4 form, connect capacitor C 2 between the rectification output cathode of current rectifying and wave filtering circuit and the output negative pole, the collector electrode of triode Q1 connects the output cathode of current rectifying and wave filtering circuit, the emitter of triode Q1 is connected with the collector electrode of triode Q2 by biasing resistor R4, the emitter of triode Q2 connects the output negative pole of current rectifying and wave filtering circuit by biasing resistor R5, be connected with respectively diode D5 and diode D6 between the base stage of triode Q1 and triode Q2 and the emitter, resistance R 2 and resistance R 3 series connection, the output cathode of resistance R 2 and current rectifying and wave filtering circuit, resistance R 3 is connected with the base stage of triode Q2, the collector electrode of the connecting line of resistance R 2 and resistance R 3 and triode Q2 has node, capacitor C 3 is connected in parallel with resistance R 2, triode Q1 is connected base stage and is connected respectively biasing resistor R6 and biasing resistor R7 with triode Q2, biasing resistor R6 is connected collector electrode and is connected respectively the input of the first coil T11 of magnetic ring transformer T1 with triode Q2, biasing resistor R7 is connected emitter and is connected respectively the input of the second coil T12 of magnetic ring transformer T1 with triode Q2, and also be connected with capacitor C 4 between the input of the second coil T12 of the emitter of triode Q2 and magnetic ring transformer T1, the secondary output of magnetic ring transformer T1 connects by diode D7 by current-limiting inductance L1, D8, the second ac input end of the bridge rectifier that D9 and D10 form, the collector electrode of triode Q1 connects the first ac input end of described bridge rectifier by capacitor C 5, current-limiting inductance L1 and capacitor C 5 form the LC series resonant circuit, are parallel with successively capacitor C 6 between the output cathode of bridge rectifier and the output negative pole, diode (LED) is issued in the load of bleeder resistance R8 and a plurality of series connection.
Claims (1)
1. led drive circuit, it is characterized in that: power supply Ui is connected connection by diode D1 by insurance resistance R 1 with the X capacitor C, D2, two ac input end mouths of the current rectifying and wave filtering circuit that D3 and D4 form, connect capacitor C 2 between the rectification output cathode of current rectifying and wave filtering circuit and the output negative pole, the collector electrode of triode Q1 connects the output cathode of current rectifying and wave filtering circuit, the emitter of triode Q1 is connected with the collector electrode of triode Q2 by biasing resistor R4, the emitter of triode Q2 connects the output negative pole of current rectifying and wave filtering circuit by biasing resistor R5, be connected with respectively diode D5 and diode D6 between the base stage of triode Q1 and triode Q2 and the emitter, resistance R 2 and resistance R 3 series connection, the output cathode of resistance R 2 and current rectifying and wave filtering circuit, resistance R 3 is connected with the base stage of triode Q2, the collector electrode of the connecting line of resistance R 2 and resistance R 3 and triode Q2 has node, capacitor C 3 is connected in parallel with resistance R 2, triode Q1 is connected base stage and is connected respectively biasing resistor R6 and biasing resistor R7 with triode Q2, biasing resistor R6 is connected collector electrode and is connected respectively the input of the first coil T11 of magnetic ring transformer T1 with triode Q2, biasing resistor R7 is connected emitter and is connected respectively the input of the second coil T12 of magnetic ring transformer T1 with triode Q2, and also be connected with capacitor C 4 between the input of the second coil T12 of the emitter of triode Q2 and magnetic ring transformer T1, the secondary output of magnetic ring transformer T1 connects by diode D7 by current-limiting inductance, D8, the second ac input end of the bridge rectifier that D9 and D10 form, the collector electrode of triode Q1 connects the first ac input end of described bridge rectifier by capacitor C 5, current-limiting inductance L1 and capacitor C 5 form the LC series resonant circuit, are parallel with successively capacitor C 6 between the output cathode of bridge rectifier and the output negative pole, diode (LED) is issued in the load of bleeder resistance R8 and a plurality of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102963108A CN103369792A (en) | 2013-07-15 | 2013-07-15 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102963108A CN103369792A (en) | 2013-07-15 | 2013-07-15 | LED drive circuit |
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| CN103369792A true CN103369792A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013102963108A Pending CN103369792A (en) | 2013-07-15 | 2013-07-15 | LED drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981049A (en) * | 2014-04-14 | 2015-10-14 | 欧司朗有限公司 | Light modulation driving circuit and illumination apparatus comprising the light modulation driving circuit |
| CN108366479A (en) * | 2017-12-29 | 2018-08-03 | 河南北瑞电子科技有限公司 | A kind of electric ballast for fluorescent lamp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202077229U (en) * | 2011-04-22 | 2011-12-14 | 深圳市腾威电子有限公司 | Driving circuit for LED lamp |
| CN102573166A (en) * | 2010-12-22 | 2012-07-11 | 奥斯兰姆施尔凡尼亚公司 | Light emitting diode retrofit system for fluorescent lighting systems |
| CN102752929A (en) * | 2012-06-28 | 2012-10-24 | 上海大学 | High-power factor LED (light-emitting diode) driving circuit supporting silicon controlled rectifier dimming |
| CN102970808A (en) * | 2012-11-16 | 2013-03-13 | 安徽世林照明股份有限公司 | Fluorescent lamp ballast circuit |
-
2013
- 2013-07-15 CN CN2013102963108A patent/CN103369792A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573166A (en) * | 2010-12-22 | 2012-07-11 | 奥斯兰姆施尔凡尼亚公司 | Light emitting diode retrofit system for fluorescent lighting systems |
| CN202077229U (en) * | 2011-04-22 | 2011-12-14 | 深圳市腾威电子有限公司 | Driving circuit for LED lamp |
| CN102752929A (en) * | 2012-06-28 | 2012-10-24 | 上海大学 | High-power factor LED (light-emitting diode) driving circuit supporting silicon controlled rectifier dimming |
| CN102970808A (en) * | 2012-11-16 | 2013-03-13 | 安徽世林照明股份有限公司 | Fluorescent lamp ballast circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981049A (en) * | 2014-04-14 | 2015-10-14 | 欧司朗有限公司 | Light modulation driving circuit and illumination apparatus comprising the light modulation driving circuit |
| CN104981049B (en) * | 2014-04-14 | 2018-12-28 | 欧司朗有限公司 | Dimming driving circuit and lighting device including the dimming driving circuit |
| CN108366479A (en) * | 2017-12-29 | 2018-08-03 | 河南北瑞电子科技有限公司 | A kind of electric ballast for fluorescent lamp |
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Application publication date: 20131023 |