CN102933005A - Circuit for LED constant current power supply - Google Patents
Circuit for LED constant current power supply Download PDFInfo
- Publication number
- CN102933005A CN102933005A CN201210480372XA CN201210480372A CN102933005A CN 102933005 A CN102933005 A CN 102933005A CN 201210480372X A CN201210480372X A CN 201210480372XA CN 201210480372 A CN201210480372 A CN 201210480372A CN 102933005 A CN102933005 A CN 102933005A
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- current
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- voltage
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a circuit for an LED constant current power supply. The circuit is characterized in that in the circuit, an alternating current voltage is subjected to rectification by a rectifier bridge, and then is subjected to a filter to enable the waveform of an input voltage to be smooth; the input voltage is converted into a direct voltage after passing an electrolytic capacitor filter; the direct voltage is loaded on an LED after passing a constant-current IC chip; current range of the LED is adjusted by resistors R2 and R3, which are connected with the constant-current IC chip; and a constant-current IC chip protection circuit formed by a Zener diode ZD1, a triode Q1 and a resistor R1 is arranged between the electrolytic capacitor filter and the constant-current IC chip. The circuit is simple in line, low in cost and high in current control accuracy.
Description
Technical field
The present invention relates to the interchange constant-current power supply circuit of a kind of LED of being applied to, particularly a kind of LED constant-current power supply circuit.
Background technology
The LED lamp is fluorescent lamp as an alternative, and in commercial lighting, office lighting uses popularity, and work brings great convenience to daily life.LED lamp one large characteristics are directly to power with civil power, therefore the LED lamp will just need to provide corresponding power drives as illuminating lamp, second in order to guarantee the constant circuit design of LED lamp constant current,, LED power supply commonly used is controlled power supply as the LED power supply with RC circuit or integrated IC usually on the market now.RC circuit advantage is that peripheral components is few, circuit simple, the pcb board size is little.Shortcoming RC circuit is stabilized voltage power supply but not constant-current supply, need with increase high-power resistance control output current, constant current accuracy is low, efficient is low, modulability is poor, be fit to the high voltage low current LED lamp pearl.Integrated IC control power supply advantage current precision is high, efficient is high, modulability good, is applicable to arbitrarily different LED lamp pearl.Shortcoming is that peripheral components is many, complex circuit, cost are high.
Summary of the invention
Purpose of the present invention provides a kind of peripheral components few in order to overcome the shortcoming of existing LED constant-current power supply circuit, and circuit is simple, and is with low cost, the LED constant-current power supply circuit that the Current Control precision is high.
Technical scheme of the present invention is; a kind of LED constant-current power supply circuit; be characterized in; this circuit is through the rectifier bridge stack rectification by alternating voltage; make input voltage waveform level and smooth through filter again; be transformed into a direct voltage by the input voltage behind the electrochemical capacitor filter; be loaded on the LED behind the IC chip of this direct voltage through a constant current; by the resistance R 2 that is connected with constant current IC chip; R3 regulates the current range on the LED; between the IC chip of described electrochemical capacitor filter and constant current, arrange one by voltage stabilizing didoe ZD1; triode Q1, the constant current IC chip protection circuit that resistance R 1 consists of.
Described rectifier bridge stack forms bridge circuit by 4 diode BD1 and forms; Filter is the electrochemical capacitor filter.
The invention has the beneficial effects as follows that the LED constant-current drive circuit peripheral components that provides is few, circuit is simple, and is with low cost, and the Current Control precision is high.
Description of drawings
Fig. 1 is LED constant-current power supply circuit schematic diagram of the present invention.
Embodiment
LED constant-current power supply circuit of the present invention is by shown in Figure 1, alternating voltage is through fuse F1, piezo-resistance RV in parallel is input to the rectifier bridge stack rectification that is comprised of four diode BD1, filter filtering via electrochemical capacitor C1 formation, output one end of electrochemical capacitor C1 respectively with triode Q1 collector electrode be connected with the base resistance R1 of triode Q1, the other end ground connection of electrochemical capacitor C1 output, the emitter of described triode Q1 is connected with constant current IC chip U1 input Vin, the base stage of triode Q1 is connected with constant current IC chip U1 output end vo ut by voltage-stabiliser tube ZD1, constant current IC chip U1 output end vo ut is by sampling resistor R2, R3 respectively with 1 end and the LED1 of constant current IC chip U1, LED2, LED3 is connected LED1 with the positive pole of LED4 series connection, LED2, the negative pole that LED3 is connected with LED4 is connected the earth terminal of electrochemical capacitor C1 and is connected with the electrochemical capacitor filter.
Operation principle of the present invention: when alternating voltage progressively in the uphill process, constant current IC chip U1 is in order to guarantee to flow through the current constant of its circuit, and the Vin of constant current IC chip U1 and the voltage on the Vout two ends raise gradually.But the highest voltage that bears of constant current IC chip U1 is low than input voltage, can cause burning of constant current IC chip U1 when surpassing the input voltage limit value of constant current IC chip U1, so need to increase constant current IC chip protection circuit at circuit.Use voltage stabilizing didoe ZD1; triode Q1; resistance R 1 consists of the protective circuit of constant current IC chip U1; when input voltage progressively in the uphill process; when the Vin of constant current IC chip U1 and Vout both end voltage surpass the withstand voltage voltage of voltage stabilizing didoe ZD1; constant current IC chip U1 normal operation; after the Vin of constant current IC chip U1 and Vout both end voltage surpass voltage stabilizing didoe ZD1 voltage; alternating voltage continues to raise; so that voltage raises gradually on the triode Q1, but the upper voltage that keeps of constant current this moment IC chip U1 is constant.This moment, triode Q1 should select the high pressure triode, can bear high voltage, can not cause because bearing high pressure triode Q1 to puncture to guarantee triode Q1.
Because it is that alternating voltage converts direct voltage to by electrochemical capacitor that the LED supply power voltage is provided, and must be high voltage and constant current lamp pearl so be applied to the LED of this circuit.This circuit is suitable for the LED of high voltage low current.
Claims (1)
1. LED constant-current power supply circuit; it is characterized in that; this circuit is through the rectifier bridge stack rectification by alternating voltage; make input voltage waveform level and smooth through the electrochemical capacitor filter again; be transformed into a direct voltage by the input voltage behind the electrochemical capacitor filter; be loaded on the LED behind the IC chip of this direct voltage through a constant current; by the resistance R 2 that is connected with constant current IC chip; R3 regulates the current range on the LED; between the IC chip of described electrochemical capacitor filter and constant current, arrange one by voltage stabilizing didoe ZD1; triode Q1, the constant current IC chip protection circuit that resistance R 1 consists of.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210480372XA CN102933005A (en) | 2012-11-23 | 2012-11-23 | Circuit for LED constant current power supply |
| PCT/CN2013/000141 WO2014079134A1 (en) | 2012-11-23 | 2013-02-16 | Led constant current power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210480372XA CN102933005A (en) | 2012-11-23 | 2012-11-23 | Circuit for LED constant current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102933005A true CN102933005A (en) | 2013-02-13 |
Family
ID=47647651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210480372XA Pending CN102933005A (en) | 2012-11-23 | 2012-11-23 | Circuit for LED constant current power supply |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102933005A (en) |
| WO (1) | WO2014079134A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103747585A (en) * | 2014-01-10 | 2014-04-23 | 陈榕 | Illuminating system under 36V |
| WO2014079134A1 (en) * | 2012-11-23 | 2014-05-30 | 上海顿格电子贸易有限公司 | Led constant current power supply circuit |
| WO2015000279A1 (en) * | 2013-07-03 | 2015-01-08 | 宁波宜升光电科技有限公司 | Ultrathin projecting lamp |
| CN108183607A (en) * | 2018-02-11 | 2018-06-19 | 浙江亿邦信息技术有限公司 | A kind of power control circuit and application |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994799A (en) * | 2019-12-16 | 2020-04-10 | 广州市科士达电源设备有限公司 | Intelligent power distribution cabinet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201369858Y (en) * | 2008-12-12 | 2009-12-23 | 天津市微仪电子仪器科技有限公司 | Device for supplying stable working current for LED lamps in wide voltage range |
| CN202941013U (en) * | 2012-11-23 | 2013-05-15 | 上海顿格电子贸易有限公司 | LED constant-current power supply circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3708345B2 (en) * | 1998-11-25 | 2005-10-19 | 株式会社エルテル | Light emitting element drive circuit |
| CN201315687Y (en) * | 2008-11-11 | 2009-09-23 | 康佳集团股份有限公司 | LED constant-current source channel protection circuit |
| CN201374838Y (en) * | 2009-03-11 | 2009-12-30 | 四川九洲铭伟半导体照明有限公司 | LED driving power source |
| CN102933005A (en) * | 2012-11-23 | 2013-02-13 | 上海顿格电子贸易有限公司 | Circuit for LED constant current power supply |
-
2012
- 2012-11-23 CN CN201210480372XA patent/CN102933005A/en active Pending
-
2013
- 2013-02-16 WO PCT/CN2013/000141 patent/WO2014079134A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201369858Y (en) * | 2008-12-12 | 2009-12-23 | 天津市微仪电子仪器科技有限公司 | Device for supplying stable working current for LED lamps in wide voltage range |
| CN202941013U (en) * | 2012-11-23 | 2013-05-15 | 上海顿格电子贸易有限公司 | LED constant-current power supply circuit |
Non-Patent Citations (1)
| Title |
|---|
| TEXAS INSTUMENTS: "TL783 High-voltage adjustable regulator", 《HTTP://WWW.ALLDATASHEET.COM/DATASHEET-PDF/PDF/28835/TI/TL783.HTML》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014079134A1 (en) * | 2012-11-23 | 2014-05-30 | 上海顿格电子贸易有限公司 | Led constant current power supply circuit |
| WO2015000279A1 (en) * | 2013-07-03 | 2015-01-08 | 宁波宜升光电科技有限公司 | Ultrathin projecting lamp |
| EP2846073A4 (en) * | 2013-07-03 | 2016-03-02 | Ningbo Yusing Optoelectronic Technology Co Ltd | Ultrathin projecting lamp |
| CN103747585A (en) * | 2014-01-10 | 2014-04-23 | 陈榕 | Illuminating system under 36V |
| CN103747585B (en) * | 2014-01-10 | 2016-03-02 | 陈榕 | The illuminator of a kind of below 36V |
| CN108183607A (en) * | 2018-02-11 | 2018-06-19 | 浙江亿邦信息技术有限公司 | A kind of power control circuit and application |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014079134A1 (en) | 2014-05-30 |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130213 |