CN102281674A - Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device - Google Patents
Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device Download PDFInfo
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- CN102281674A CN102281674A CN201110139726XA CN201110139726A CN102281674A CN 102281674 A CN102281674 A CN 102281674A CN 201110139726X A CN201110139726X A CN 201110139726XA CN 201110139726 A CN201110139726 A CN 201110139726A CN 102281674 A CN102281674 A CN 102281674A
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Abstract
The invention discloses a constant current driving circuit of high-power light-emitting diode (LED) light-emitting devices, and relates to a power supply circuit of the high-power LED light-emitting device. The constant current driving circuit of the high-power LED light-emitting devices solves the problem that the conventional high-power LED constant current driving circuit easily burns up a constant current regulator chip (NU511) when the NU511 turns off the output voltage. The constant current driving circuit of the high-power LED light-emitting devices comprises a driving circuit power supply, series resistors, a plurality of high-power LED light-emitting devices, a voltage regulation chip, a back voltage resistor and an output resistor, wherein the driving circuit power supply is connected with the anode of the high-power LED light-emitting device LED1; the high-power LED light-emitting devices LED1 to LEDn are connected together in series; the cathode of the LEDn is connected with a current output pin of the voltage regulation chip and one end of the back voltage resistor; and the other end of the back voltage resistor and the other end of the output resistor are grounded. The constant current driving circuit also comprises a bleeder resistor, wherein a pin Vdd of the voltage regulation chip is connected with one end of the bleeder resistor and the anode of the high-power LED light-emitting device LEDn, and the other end of the bleeder resistor is grounded.
Description
Technical field
The present invention relates to the power supply circuits of great power LED luminescent device.
Background technology
When the one group of great power LED luminescent device that is cascaded is powered,, generally need to use the adjuster of NU511 as a constant current in order to keep the brightness stability of LED luminescent device illumination.As shown in Figure 1, the effect of NU511 is when the work junction voltage of the power Vcc of series circuit or LED changes, and regulates output voltage automatically, keeps the current constant of LED power supply circuits constant.
The problem that exists is to adopt NU511 to realize in the circuit of great power LED constant-current driving at present, the power supply input pin Vdd of chip NU511 is connected the A point in the series circuit of great power LED, the maximum withstand voltage of chip NU511 is 24 volts, and when NU511 shutoff output voltage knocks out the LED photophore, A point voltage among the figure burns chip NU511 easily because the series circuit power Vcc maximum of great power LED may surpass 24 volts.
Summary of the invention
The constant-current drive circuit that the purpose of this invention is to provide a kind of great power LED luminescent device is to solve existing high power LED constant-current driving circuit burns constant current regulator chip NU511 easily when NU511 turn-offs output voltage problem.It comprises the drive circuit power Vcc, series resistance Rs, a plurality of great power LED luminescent devices, pressure regulation chip NU511, back pressure resistance R xout and output resistance Rext, the drive circuit power Vcc connects the anode of great power LED luminescent device LED1, great power LED luminescent device LED1 to LEDn is cascaded, the negative electrode of great power LED luminescent device LEDn connects the electric current output pin out of pressure regulation chip NU511 and the end of back pressure resistance R xout, the pin Rext of pressure regulation chip NU511 connects the end of output resistance Rext, the other end of back pressure resistance R xout and the other end ground connection of output resistance Rext, it also comprises bleeder resistor Rxvcc, the pin Vdd of pressure regulation chip NU511 connects the end of bleeder resistor Rxvcc and the anode of great power LED luminescent device LEDn, the other end ground connection of bleeder resistor Rxvcc.
After having used constant-current drive circuit of the present invention, when all great power LED luminescent device conducting, the A point voltage only is the output regulation voltage that the voltage at LEDn two ends adds pressure regulation chip NU511, so the voltage that A is ordered will not can not injure pressure regulation chip NU511 above 24 volts.When the NU511 shutoff makes all great power LED luminescent devices not luminous, if there is not resistance R xvcc, the A point voltage will be near Vcc, if at this moment Vcc is above 24 volts, circuit just has the possibility of ultra-voltage work, can cause non-normal working or the infringement of pressure regulation chip NU511.Rxvcc has been arranged, constitute path by the Rs in the circuit, several LED and resistance R xvcc,, make this path keep small electric current (but deficiency is so that LED is luminous) by selecting the resistance of Rxvcc, A point voltage in the circuit will be far smaller than Vcc this moment, thereby can not burn the NU511 chip.
Description of drawings
Fig. 1 is the prior art constructions schematic diagram, and Fig. 2 is a structural representation of the present invention.
Embodiment
Embodiment one: specify present embodiment in conjunction with Fig. 2.Present embodiment comprises the drive circuit power Vcc, series resistance Rs, a plurality of great power LED luminescent devices, pressure regulation chip NU511, back pressure resistance R xout and output resistance Rext, the drive circuit power Vcc connects the anode of great power LED luminescent device LED1, great power LED luminescent device LED1 to LEDn is cascaded, the negative electrode of great power LED luminescent device LEDn connects the electric current output pin out of pressure regulation chip NU511 and the end of back pressure resistance R xout, the pin Rext of pressure regulation chip NU511 connects the end of output resistance Rext, the other end of back pressure resistance R xout and the other end ground connection of output resistance Rext, it also comprises bleeder resistor Rxvcc, the pin Vdd of pressure regulation chip NU511 connects the end of bleeder resistor Rxvcc and the anode of great power LED luminescent device LEDn, the other end ground connection of bleeder resistor Rxvcc.The pin Gnd ground connection of pressure regulation chip NU511, the pin OE of pressure regulation chip NU511 connects control circuit as signal input end.
Claims (1)
1. the constant-current drive circuit of great power LED luminescent device, it comprises the drive circuit power Vcc, series resistance Rs, a plurality of great power LED luminescent devices, pressure regulation chip NU511, back pressure resistance R xout and output resistance Rext, the drive circuit power Vcc connects the anode of great power LED luminescent device LED1, great power LED luminescent device LED1 to LEDn is cascaded, the negative electrode of great power LED luminescent device LEDn connects the electric current output pin out of pressure regulation chip NU511 and the end of back pressure resistance R xout, the pin Rext of pressure regulation chip NU511 connects the end of output resistance Rext, the other end of back pressure resistance R xout and the other end ground connection of output resistance Rext, it is characterized in that it also comprises bleeder resistor Rxvcc, the pin Vdd of pressure regulation chip NU511 connects the end of bleeder resistor Rxvcc and the anode of great power LED luminescent device LEDn, the other end ground connection of bleeder resistor Rxvcc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110139726XA CN102281674A (en) | 2011-05-27 | 2011-05-27 | Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110139726XA CN102281674A (en) | 2011-05-27 | 2011-05-27 | Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device |
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| Publication Number | Publication Date |
|---|---|
| CN102281674A true CN102281674A (en) | 2011-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110139726XA Pending CN102281674A (en) | 2011-05-27 | 2011-05-27 | Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device |
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| CN (1) | CN102281674A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917517A (en) * | 2012-11-14 | 2013-02-06 | 深圳市华星光电技术有限公司 | Method for generating different current driving lamp bars by utilizing constant current driving chip and driving circuit thereof |
| CN105230130A (en) * | 2013-05-22 | 2016-01-06 | 硅工厂股份有限公司 | The control circuit of LED light device and voltage generating method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6847169B2 (en) * | 2002-10-08 | 2005-01-25 | Koito Manufacturing Co., Ltd. | Lighting circuit |
| CN101637064A (en) * | 2007-03-12 | 2010-01-27 | 塞瑞斯逻辑公司 | Lighting system with power factor correction control data determined from a phase modulated signal |
| CN202121826U (en) * | 2011-05-27 | 2012-01-18 | 哈尔滨理工大学 | Constant current driving circuit of high-power LED luminescent device |
-
2011
- 2011-05-27 CN CN201110139726XA patent/CN102281674A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6847169B2 (en) * | 2002-10-08 | 2005-01-25 | Koito Manufacturing Co., Ltd. | Lighting circuit |
| CN101637064A (en) * | 2007-03-12 | 2010-01-27 | 塞瑞斯逻辑公司 | Lighting system with power factor correction control data determined from a phase modulated signal |
| CN202121826U (en) * | 2011-05-27 | 2012-01-18 | 哈尔滨理工大学 | Constant current driving circuit of high-power LED luminescent device |
Non-Patent Citations (2)
| Title |
|---|
| 数能科技股份有限公司: "《High Constant Current LED Driver Datasheet，1.2A Single Channel LED Driver》", 1 May 2009 * |
| 李培丽等: "真空自动量热仪测温电路的改进", 《华中理工大学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917517A (en) * | 2012-11-14 | 2013-02-06 | 深圳市华星光电技术有限公司 | Method for generating different current driving lamp bars by utilizing constant current driving chip and driving circuit thereof |
| CN102917517B (en) * | 2012-11-14 | 2015-06-03 | 深圳市华星光电技术有限公司 | Method for generating different current driving lamp bars by utilizing constant current driving chip and driving circuit thereof |
| CN105230130A (en) * | 2013-05-22 | 2016-01-06 | 硅工厂股份有限公司 | The control circuit of LED light device and voltage generating method |
| CN105230130B (en) * | 2013-05-22 | 2018-08-03 | 硅工厂股份有限公司 | The control circuit and voltage generating method of LED light device |
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Addressee: Harbin University of Science and Technology Document name: Notification of Publication and of Entering the Substantive Examination Stage of the Application for Invention |
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Application publication date: 20111214 |