CN201467523U - Power supply driving circuit of LED lamp - Google Patents
Power supply driving circuit of LED lamp Download PDFInfo
- Publication number
- CN201467523U CN201467523U CN2009200619035U CN200920061903U CN201467523U CN 201467523 U CN201467523 U CN 201467523U CN 2009200619035 U CN2009200619035 U CN 2009200619035U CN 200920061903 U CN200920061903 U CN 200920061903U CN 201467523 U CN201467523 U CN 201467523U
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- circuit
- high frequency
- integrated circuit
- power supply
- led lamp
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- 230000004308 accommodation Effects 0.000 description 1
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Abstract
The utility model relates to a power drive circuit of LED lamp that power factor is high, stability is good, including filter circuit, rectifier circuit, step-down circuit, its characterized in that mains power supply's input connects the model behind filter circuit, rectifier circuit to be L6562's integrated circuit, and this integrated circuit, switch tube, high frequency transformer constitute step-down circuit, wherein by the integrated circuit output drive that produces pulse width modulation signal drive waveform the switch tube with high frequency transformer's primary, high frequency coil's low pressure output secondary's voltage provides DC power supply to LED emitting diode after rectification, filtering.
Description
Technical field
The utility model relates to a kind of power driving circuit of LED lamp.
Background technology
Existing LED lamp power driving circuit generally comprises reduction voltage circuit, rectification circuit, filter circuit, its principle is directly to supply with the LED light-emitting diode with becoming direct current after the AC-input voltage step-down of 220V, rectification, the filtering, makes light-emitting diode luminous under galvanic driving.Not only power factor is low for existing this LED lamp power driving circuit, and line voltage is when unstable, the less stable of its output voltage.
Summary of the invention
The purpose of this utility model is that the power factor that has the existence of LED lamp power driving circuit now is low, the problem of poor stability in order to solve, and the power driving circuit of the LED lamp of a kind of power factor height, good stability is provided.
The purpose of this utility model is achieved in that a kind of power driving circuit of LED lamp, comprise filter circuit, rectification circuit, reduction voltage circuit, the input that it is characterized in that mains supply is through filter circuit, connect the integrated circuit that model is L6562 behind the rectification circuit, this integrated circuit, switching tube, high frequency transformer constitutes described reduction voltage circuit, wherein driven the primary coil of described switching tube and described high frequency transformer by the ic output that produces the pulse-width signal drive waveforms, the voltage of the low pressure output secondary coil of high frequency coil is through rectification, provide DC power supply to the LED light-emitting diode after the filtering.
Owing to adopted technical scheme described in the utility model, utilize the pulse-width signal driving switch pipe of L6562 integrated circuit generation and the primary coil of high frequency transformer, secondary generation low pressure at high frequency transformer provides Dc low voltage power supply to light-emitting diode after rectification, it is actually a Switching Power Supply, so its power factor height, input voltage wide accommodation.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Shown in the accompanying drawing circuit theory diagrams of a specific embodiment of the utility model.
Mark among the figure, F1, electric current protective tube, NTC1, thermistor, RZ1, piezo-resistance, C represents capacitor--and the numeral of back is a numbering, D1, rectifier bridge; CY1, CY2, CY3, capacitor, R represents resistance--and the numeral of back is a numbering, D2, D3, D4, D5, D6, D7, D8, D9, diode, IC1, IC2, IC5, integrated circuit, Q1, switching tube, T1, filter inductor, T2, high frequency depressor; L1, L2, inductance coil, LF, filter inductor.
Embodiment:
See shown in the accompanying drawing that the ground wire of pin 1 external power supply on the plug of lower left, pin 2 and 3 are distinguished external 100--240V, exchanged the mains supply of 50/60Hz, two PGND among the figure join, and C1, C20, T1, CY1, CY2 are the EMI filter elements; C2 is a filter capacitor; R3, R4, R7 are the input voltage sample resistances; R14, R11, R38 are the IC supplying resistances; R22, D3, R7 form the IC supply network; The effect of IC2, R13, R12 is the isolated controlling network element, and R15 is the photoelectrical coupler supplying resistance; R9, D2, R18, D5 are that switching tube drives network element; R16, R6, C4 are the overpower protection networks; R22, D3, R5, be voltage detector component; D8 is the output rectifying tube; C12, R24, R25 are that the RC of D8 absorbs network element; C11, C13, C19, L2, C17, C18, LF are the output filter elements; R20 is that output overcurrent detects resistance; R36, IC5, C16 provide reference voltage to model for the integrated circuit of LM324; R17, C7, R30, C15 are that model is the feedback network element of the integrated circuit of LM324, and R35, R26, R27, R33, R29, R29-1 are the benchmark divider resistances; Wherein model is that the integrated circuit of LM324 comprises operational amplifier IC3A and IC3B, and two people's operational amplifiers are respectively the constant control chips of output voltage and output current, and D4, D9 are respectively the output diodes of two operational amplifiers; Model is that the integrated circuit of LM324 is actually a four-operational amplifier, has only used two operational amplifiers wherein in the present embodiment.
The specified input voltage of this embodiment is that 100--240V/50-60Hz allows input voltage: 90--264V/50-60Hz, its operation principle is as follows: arrive rectifier bridge D1 after the filtering of input AC voltage process EMI filter network, through producing dc voltage after D1 rectification and the C2 filtering; By R3, R4 provides the initial start power supply to model for the integrated circuit (IC) 1 of L6562, produces a pulse-width signal drive waveforms by integrated circuit (IC) 1, and driving switch pipe Q1 and high frequency transformer T2 finish the DC-DC step-down.Model is that the interior operational amplifier IC3A of the integrated circuit of LM324 realizes constant current control, operational amplifier IC3A output high level reached the constant current purpose through diode D4 and integrated circuit (IC) 2 photoelectric coupler isolation control integrated circuit IC1 output pulse widths when the electric current on outputing to LED increased; Operational amplifier IC3B finishes output voltage control, and when output voltage raise, operational amplifier IC3B exported high level, finishes the control output voltage function through D9 and IC2 photoelectric coupler isolation control IC 1 pulsewidth.
Claims (1)
1. the power driving circuit of a LED lamp, comprise filter circuit, rectification circuit, reduction voltage circuit, the input that it is characterized in that mains supply connects the integrated circuit that model is L6562 behind filter circuit, rectification circuit, this integrated circuit, switching tube, high frequency transformer constitute described reduction voltage circuit, wherein driven the primary coil of described switching tube and described high frequency transformer by the ic output that produces the pulse-width signal drive waveforms, the voltage of the low pressure output secondary coil of high frequency coil provides DC power supply to the LED light-emitting diode after rectification, filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200619035U CN201467523U (en) | 2009-08-06 | 2009-08-06 | Power supply driving circuit of LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200619035U CN201467523U (en) | 2009-08-06 | 2009-08-06 | Power supply driving circuit of LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201467523U true CN201467523U (en) | 2010-05-12 |
Family
ID=42394867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200619035U Expired - Fee Related CN201467523U (en) | 2009-08-06 | 2009-08-06 | Power supply driving circuit of LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201467523U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139290A1 (en) * | 2011-04-14 | 2012-10-18 | 深圳市长运通光电技术有限公司 | Led light-emitting device |
| CN102984859A (en) * | 2012-11-16 | 2013-03-20 | 深圳和而泰照明科技有限公司 | Light-emitting diode (LED) driving circuit and light-emitting diode (LED) driving device |
| CN103687206A (en) * | 2013-11-27 | 2014-03-26 | 广西玖典电子新材料有限公司 | LED flashlight |
-
2009
- 2009-08-06 CN CN2009200619035U patent/CN201467523U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139290A1 (en) * | 2011-04-14 | 2012-10-18 | 深圳市长运通光电技术有限公司 | Led light-emitting device |
| CN102984859A (en) * | 2012-11-16 | 2013-03-20 | 深圳和而泰照明科技有限公司 | Light-emitting diode (LED) driving circuit and light-emitting diode (LED) driving device |
| CN102984859B (en) * | 2012-11-16 | 2014-12-17 | 深圳和而泰照明科技有限公司 | Light-emitting diode (LED) driving circuit and light-emitting diode (LED) driving device |
| CN103687206A (en) * | 2013-11-27 | 2014-03-26 | 广西玖典电子新材料有限公司 | LED flashlight |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20120806 |