CN202121826U - Constant current driving circuit of high-power LED luminescent device - Google Patents
Constant current driving circuit of high-power LED luminescent device Download PDFInfo
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- CN202121826U CN202121826U CN2011201736300U CN201120173630U CN202121826U CN 202121826 U CN202121826 U CN 202121826U CN 2011201736300 U CN2011201736300 U CN 2011201736300U CN 201120173630 U CN201120173630 U CN 201120173630U CN 202121826 U CN202121826 U CN 202121826U
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- power led
- led luminescent
- luminescent device
- resistor
- driving circuit
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Abstract
The utility model relates to a constant current driving circuit of a high-power LED luminescent device, which relates to a power supplying circuit of the high-power LED luminescent device and solves the problem that a constant-current regulator chip NU511 is easy to be burned out by an existing high-power LED constant current driving circuit when output voltage is cut off via the NU511. The constant current driving circuit comprises a driving circuit power source, a series resistor, a plurality of high-power LED luminescent devices, a voltage regulating chip, a back-voltage resistor, an output resistor and a bleeder resistor, the driving circuit power source is connected with a positive electrode of the high-power LED luminescent device LED1, the high-power LED luminescent devices from LED1 to LEDn are serially connected, a negative electrode of the LEDn is connected with a current output base pin of the voltage regulating chip and one end of the back-voltage resistor, the other end of the back-voltage resistor and the other end of the output resistor are grounded, a base pin Vdd of the voltage regulating chip is connected with one end of the bleeder resistor and the positive electrode of the high-power LED luminescent 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 supplied power,, 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 at present is to adopt NU511 to realize in the circuit of great power LED constant-current driving; 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 knocked out the LED photophore, the A point voltage among the figure burn chip NU511 easily because the series circuit power Vcc maximum of great power LED possibly 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 drive circuit power Vcc, series resistance Rs, a plurality of great power LED luminescent device, 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, and 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) through 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 sketch map, and Fig. 2 is a structural representation of the present invention.
Embodiment
Embodiment one: combine Fig. 2 to specify this execution mode.This execution mode comprises drive circuit power Vcc, series resistance Rs, a plurality of great power LED luminescent device, 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, and 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 drive circuit power Vcc, series resistance Rs, a plurality of great power LED luminescent device, 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, and the other end of back pressure resistance R xout and the other end ground connection of output resistance Rext 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 |
|---|---|---|---|
| CN2011201736300U CN202121826U (en) | 2011-05-27 | 2011-05-27 | Constant current driving circuit of high-power LED luminescent device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201736300U CN202121826U (en) | 2011-05-27 | 2011-05-27 | Constant current driving circuit of high-power LED luminescent device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202121826U true CN202121826U (en) | 2012-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201736300U Expired - Fee Related CN202121826U (en) | 2011-05-27 | 2011-05-27 | Constant current driving circuit of high-power LED luminescent device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202121826U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281674A (en) * | 2011-05-27 | 2011-12-14 | 哈尔滨理工大学 | Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device |
-
2011
- 2011-05-27 CN CN2011201736300U patent/CN202121826U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281674A (en) * | 2011-05-27 | 2011-12-14 | 哈尔滨理工大学 | Constant current driving circuit of high-power light-emitting diode (LED) light-emitting device |
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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: 20120118 Termination date: 20120527 |