CN101977474B - Drive circuit of light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance - Google Patents
Drive circuit of light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance Download PDFInfo
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- CN101977474B CN101977474B CN 201010546466 CN201010546466A CN101977474B CN 101977474 B CN101977474 B CN 101977474B CN 201010546466 CN201010546466 CN 201010546466 CN 201010546466 A CN201010546466 A CN 201010546466A CN 101977474 B CN101977474 B CN 101977474B
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Abstract
The invention relates to a drive circuit of a light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance, which comprises a fuse tube BX, resistances (R1, R2, R3 and R4), diodes (D1, D2, D3, D4 and D5), capacitors (C1, C2, C3, C4 and C5), transistors (Q1, Q2 and Q3) and a shunt reference source IC1 with three adjustable ends, wherein the transistor Q2, the resistance R3 and the capacitor C3 constitute a soft start circuit; the transistor Q3, the resistance R1, the resistance R2 and the capacitor C1 constitute a circuit for providing a tapping passage to the capacitor C3; and the transistor Q1, the shunt reference source IC1 with the three adjustable ends, the resistance R3 and the resistance R4 constitute a constant current circuit. The invention provides a set of LED constant current illuminating lamp circuits with the characteristics of the soft start and the shock resistance, which prolongs the service life of LED and has good effect after being used.
Description
Technical field
The invention belongs to lighting circuit and drive control field, particularly relate to a kind of soft-start impact-resistant LED constant-current driving circuit for illuminating lamps.
Background technology
LED since environmental protection, the many merits such as the life-span is long, photoelectric efficiency is high be used widely at civil area in recent years.At present, just there is the electricity-saving lamp that much utilizes white light LEDs to make in market, and drives but its drive circuit is simple resistance capacitance step-down or constant voltage, has that efficient is low, curent change large, does not have the shortcoming such as impact resistance, easily make the too early light decay of LED, cause the lost of life.
Summary of the invention
The object of the present invention is to provide a kind of LED constant-current driving circuit for illuminating lamps, it has soft start and protecting against shock ability.
This soft-start impact-resistant LED constant-current driving circuit for illuminating lamps, by cartridge fuse BX, resistance R 1, R2, R3, R4, diode D1, D2, D3, D4, D5, capacitor C 1, C2, C3, C4, C5, transistor Q1, Q2, Q3, three end adjustable shunt reference source IC1 form, wherein the e utmost point of transistor Q1 and capacitor C 5 one ends, resistance R 4 one ends, capacitor C 4 one ends, the reference utmost point of three end adjustable shunt reference source IC1 joins, the c utmost point of transistor Q1 and capacitor C 5 other ends, LED lamp negative pole joins, the b utmost point of transistor Q1 and resistance R 3 one ends, capacitor C 4 other ends, the negative electrode of three end adjustable shunt reference source IC1, the e utmost point of transistor Q2 joins; The c utmost point of the anode of the c utmost point of transistor Q2 and resistance R 4 other ends, three end adjustable shunt reference source IC1, capacitor C 3 negative poles, transistor Q3, capacitor C 2 negative poles, resistance R 2 one ends, capacitor C 1 negative pole, diode D3 positive pole, diode D4 positive pole join, and the e utmost point of the b utmost point of transistor Q2 and capacitor C 3 positive poles, transistor Q3 joins; The b utmost point of transistor Q3 joins with resistance R 1 one ends, resistance R 2 other ends; The positive pole of diode D5 and diode D1 negative pole, diode D2 negative pole, capacitor C 1 positive pole, resistance R 1 other end join, and the negative pole of diode D5 and LED lamp positive pole, capacitor C 2 positive poles, resistance R 3 other ends join; AC220V civil power one utmost point is anodal by cartridge fuse BX and diode D1, diode D3 negative pole joins, and another utmost point of AC220V civil power and diode D2 are anodal, diode D4 negative pole joins.
In this soft-start impact-resistant LED constant-current driving circuit for illuminating lamps, transistor Q2, resistance R 3 and capacitor C 3 form soft starting circuit; The circuit that transistor Q3, resistance R 1, resistance R 2 and capacitor C 1 form is for capacitor C 3 provides the path of releasing; Transistor Q1, three end adjustable shunt reference source IC1, resistance R 3 and resistance R 4 form constant-current circuit.
Good effect of the present invention is: this soft-start impact-resistant LED constant-current driving circuit for illuminating lamps has the ability of protecting against shock, the ability of soft start and the ability of constant current-supplying, has prolonged the life-span of LED, and through using, effect is more satisfactory.
Description of drawings
Fig. 1 is soft-start impact-resistant LED constant-current driving circuit for illuminating lamps schematic diagram of the present invention.
Embodiment
As shown in Figure 1, soft-start impact-resistant LED constant-current driving circuit for illuminating lamps of the present invention, by 1A cartridge fuse BX, 470k Ω resistance R 1,82k Ω resistance R 2,60k Ω resistance R 3, the resistance R 4 of 60 Ω-140 Ω, diode (the D1 of 1N4007 model, D2, D3, D4, D5), 4.7 the capacitor C 1 of μ F, 2.2 the capacitor C 2 of μ F, 2.2 the capacitor C 3 of μ F, 103 capacitor C 4,682 capacitor C 5,13005 transistor Q1,8550 transistor Q2,8550 transistor Q3, TL431 three end adjustable shunt reference source IC1 form, wherein the e utmost point of transistor Q1 and capacitor C 5 one ends, resistance R 4 one ends, capacitor C 4 one ends, the reference utmost point of three end adjustable shunt reference source IC1 joins, the c utmost point of transistor Q1 and capacitor C 5 other ends, the negative pole of LED lamp 1 joins, the b utmost point of transistor Q1 and resistance R 3 one ends, capacitor C 4 other ends, the negative electrode of three end adjustable shunt reference source IC1, the e utmost point of transistor Q2 joins, the c utmost point of transistor Q2 and resistance R 4 other ends, the anode of three end adjustable shunt reference source IC1, capacitor C 3 negative poles, the c utmost point of transistor Q2, capacitor C 2 negative poles, resistance R 2 one ends, capacitor C 1 negative pole, diode D3 is anodal, diode D4 positive pole joins, the b utmost point of transistor Q2 and capacitor C 3 positive poles, the e utmost point of transistor Q3 joins, the b utmost point of transistor Q3 and resistance R 1 one ends, resistance R 2 other ends join, the positive pole of diode D5 and diode D1 negative pole, diode D2 negative pole, capacitor C 1 positive pole, resistance R 1 other end joins, the positive pole of the negative pole of diode D5 and LED lamp 1, capacitor C 2 positive poles, resistance R 3 other ends join, AC220V civil power one utmost point is anodal by cartridge fuse BX and diode D1, diode D3 negative pole joins, and another utmost point of AC220V civil power and diode D2 are anodal, diode D4 negative pole joins.
Transistor Q2, resistance R 3 and capacitor C 3 form soft starting circuit.When rigidly connecting energize, capacitor C 3 is equivalent to short circuit, and power supply arrives ground through b, the e of resistance R 3, transistor Q2 knot, capacitor C 3, transistor Q2 saturation conduction, the A point is pulled to electronegative potential, and transistor Q1 is not because there being base current to end, and the LED lamp is not luminous.After the charging of (t=1.1R3C3), capacitor C 3 both end voltage slowly raise through after a while, and transistor Q2 base current reduces gradually until end, the current potential that A is ordered slowly raises, gradually conducting of transistor Q1, the LED lamp is slowly luminous, thereby finishes soft start.
Surge voltage is from two aspects, and the one, when rigidly connecting energize, even the existence of soft starting circuit is arranged, still there is moment impact in LED lamp two ends, and this phenomenon can be found by observing the flash of light that LED send, introduce C5 and can effectively absorb this impact in circuit.The another kind of impact is when circuit the moment break-make to occur, and when namely disconnection was connected again after the energising, because capacitor C 3 both end voltage can not be suddenlyd change, soft start will lose efficacy.Therefore add the circuit that is formed by transistor Q3, resistance R 1, resistance R 2 and capacitor C 1, for capacitor C 3 provides the path of releasing, like this, even instant cut-off is connected again, transistor Q3 also can saturation conduction, voltage on the capacitor C 3 is released, thereby guarantee the normal operation of circuit.Add diode D5, avoid capacitor C 2 to cause anti-impact circuit to lose efficacy by resistance R 1 to transistor Q3 discharge.
Transistor Q1, three end adjustable shunt reference source IC1, resistance R 3 and resistance R 4 form constant-current circuit.When causing for a certain reason flowing through the electric current increase of LED lamp or reducing, the voltage drop at sampling resistor R4 two ends also and then raises or reduces, the input terminal voltage of three end adjustable shunt reference source IC1 also changes thereupon, thereby the current potential of control transistor Q1 base stage, the current constant that the LED lamp is flow through in maintenance is constant, its constant current value I=2.5 (V)/R4 (Ω).
In addition, for the reliability of circuit, note during selectors: capacitor C 1, C2, C5 all should select the above electric capacity of withstand voltage 400V.The leakage current of capacitor C 3 is little, and the electrodeless electric capacity of selecting with good conditionsi is more than the withstand voltage 16V.Resistance R 1, R2, R3, R4 all use greater than 0.5W, and when the LED operating current was 20mA, the resistance of resistance R 4 was: R4=2.5/0.02mA=125 Ω.Available 80～90 the Φ 5mm astigmatism of LED lamp string type white light LEDs is in series, and many groups are in parallel again after also can connecting, to improve the brightness of lamp.When two groups parallel, R4=2.5/ (2 * 0.02mA)=62.5 Ω.
Claims (3)
1. soft-start impact-resistant LED constant-current driving circuit for illuminating lamps, by cartridge fuse BX, resistance R 1, resistance R 2, resistance R 3, resistance R 4, diode D1, diode D2, diode D3, diode D4, diode D5, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, transistor Q1, transistor Q2, transistor Q3, three end adjustable shunt reference source IC1 form, it is characterized in that: the e utmost point of transistor Q1 and capacitor C 5 one ends, resistance R 4 one ends, capacitor C 4 one ends, the reference utmost point of three end adjustable shunt reference source IC1 joins, the c utmost point of transistor Q1 and capacitor C 5 other ends, LED lamp negative pole joins, the b utmost point of transistor Q1 and resistance R 3 one ends, capacitor C 4 other ends, the negative electrode of three end adjustable shunt reference source IC1, the e utmost point of transistor Q2 joins; The c utmost point of the anode of the c utmost point of transistor Q2 and resistance R 4 other ends, three end adjustable shunt reference source IC1, capacitor C 3 negative poles, transistor Q3, capacitor C 2 negative poles, resistance R 2 one ends, capacitor C 1 negative pole, diode D3 positive pole, diode D4 positive pole join, and the e utmost point of the b utmost point of transistor Q2 and capacitor C 3 positive poles, transistor Q3 joins; The b utmost point of transistor Q3 joins with resistance R 1 one ends, resistance R 2 other ends; The positive pole of diode D5 and diode D1 negative pole, diode D2 negative pole, capacitor C 1 positive pole, resistance R 1 other end join, and the negative pole of diode D5 and LED lamp positive pole, capacitor C 2 positive poles, resistance R 3 other ends join; AC220V civil power one utmost point is anodal by cartridge fuse BX and diode D1, diode D3 negative pole joins, and another utmost point of AC220V civil power and diode D2 are anodal, diode D4 negative pole joins; Transistor Q2, resistance R 3 and capacitor C 3 form soft starting circuit.
2. soft-start impact-resistant LED constant-current driving circuit for illuminating lamps according to claim 1 is characterized in that: the circuit that transistor Q3, resistance R 1, resistance R 2 and capacitor C 1 form, and for capacitor C 3 provides the path of releasing.
3. soft-start impact-resistant LED constant-current driving circuit for illuminating lamps according to claim 1 is characterized in that: transistor Q1, three end adjustable shunt reference source IC1, resistance R 3 and resistance R 4 composition constant-current circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010546466 CN101977474B (en) | 2010-11-16 | 2010-11-16 | Drive circuit of light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010546466 CN101977474B (en) | 2010-11-16 | 2010-11-16 | Drive circuit of light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance |
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| CN101977474A CN101977474A (en) | 2011-02-16 |
| CN101977474B true CN101977474B (en) | 2013-03-13 |
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| CN 201010546466 Expired - Fee Related CN101977474B (en) | 2010-11-16 | 2010-11-16 | Drive circuit of light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102570400B (en) * | 2012-03-13 | 2015-08-19 | 中国矿业大学 | A kind of intrinsic safety type high power switch converter output short-circuit protection method |
| CN103068107A (en) * | 2012-11-08 | 2013-04-24 | 陈盛文 | Light-emitting diode (LED) drive circuit |
| CN106455221A (en) * | 2016-10-27 | 2017-02-22 | 江苏吉泰科电气股份有限公司 | Vehicle-mounted lighting headlight driver |
| CN106998150A (en) * | 2017-04-14 | 2017-08-01 | 济南浪潮高新科技投资发展有限公司 | A kind of constant-current source and implementation method suppressed based on transient state with soft start |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201563268U (en) * | 2009-11-04 | 2010-08-25 | 河源市超越光电科技有限公司 | Drive circuit for OLED lamp |
| CN201869414U (en) * | 2010-11-16 | 2011-06-15 | 山东华盈电力能源发展有限公司 | Soft-start impact-resistant LED constant-current driving circuit for illuminating lamps |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201563268U (en) * | 2009-11-04 | 2010-08-25 | 河源市超越光电科技有限公司 | Drive circuit for OLED lamp |
| CN201869414U (en) * | 2010-11-16 | 2011-06-15 | 山东华盈电力能源发展有限公司 | Soft-start impact-resistant LED constant-current driving circuit for illuminating lamps |
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Free format text: CORRECT: INVENTOR; FROM: FANG LIN LU HUISHUI LI YUNDONG TO: FANG LIN LU HUISHUI Free format text: CORRECT: ADDRESS; FROM: 250100 ROOM 508, BUILDING 2, OVERSEAS STUDENTS VENTURE PARK, NO. 19, HUANENG ROAD, LICHENG DISTRICT, JI'NAN CITY, SHANDONG PROVINCE TO: 250011 3-3-201, NO. 5, DESHENG SOUTH STREET, SHIZHONG DISTRICT, JI'NAN CITY, SHANDONG PROVINCE |
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Application publication date: 20110216 Assignee: SHANDONG INLARIN TECHNOLOGY CO., LTD. Assignor: Fang Lin|Lu Huishui Contract record no.: 2015370000011 Denomination of invention: Drive circuit of light emitting diode (LED) constant current illuminating lamp with characteristics of soft start and shock resistance Granted publication date: 20130313 License type: Exclusive License Record date: 20150127 |
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