Unlock instant, AI-driven research and patent intelligence for your innovation.

Light emitting diode current control circuit, current equalizer and driving device

A technology of light-emitting diodes and current equalizers, which is used in the layout of electric lamp circuits, lighting devices, light sources, etc.

Inactive Publication Date: 2013-11-13
GREEN SOLUTION TECH CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if two LEDs in the LED string are damaged, the driving voltage of the LED string increases by nearly 4V, which may cause a large drop in the current of the LED string or even fail to emit light.
However, if the output voltage VOUT provided by the power supply 70 is further increased, the luminous efficiency will be lower.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Light emitting diode current control circuit, current equalizer and driving device
  • Light emitting diode current control circuit, current equalizer and driving device
  • Light emitting diode current control circuit, current equalizer and driving device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] See figure 2 , figure 2 It is a schematic circuit diagram of the LED driving device of the present invention. The LED driving device includes an LED current equalizer 100 , an LED module 160 , a power supply 170 and a voltage feedback circuit 190 . The LED module 160 includes a plurality of LED strings, one end of each LED string is coupled to the power supply 170 to receive the output voltage VO generated by the power supply 170 to drive light, and the other end is correspondingly coupled to the LED current equalizer 100 current sharing terminals DA1, DA2, . . . , DAn (n is an integer greater than 0). The LED current equalizer 100 is used for current sharing among a plurality of LED strings of the LED module 160 , so that each LED string flows through approximately the same current to generate similar brightness. The LED current equalizer 100 simultaneously generates at least one adjustment control signal ADJ1 ˜ ADJm (m is an integer greater than 0) according to t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a light emitting diode (LED) current control circuit, a current equalizer and a driving device. The LED current control circuit comprises a current regulating unit, a detection unit and a current control unit. The current regulating unit is provided with a current control end coupled with an LED string, and used for determining the magnitude of a current flowing through the LED string according to a current control signal. The detection unit detects the current control end and judges whether to generate a protective signal according to a protective voltage value. The current control unit generates a current control signal to control the magnitude of the current of the LED string, and judges whether to stop the current flowing through the LED string according to the protective signal.

Description

technical field [0001] The invention relates to a light emitting diode current control circuit, a current equalizer and a driving device, especially a light emitting diode current control circuit, a current equalizer and a driving device which can adjust the driving voltage of the light emitting diode to improve efficiency. Background technique [0002] There are two main types of driving power for LEDs. One is to provide a stable driving current for LEDs by means of current feedback control; the other is to provide stable driving voltage for LEDs by means of voltage feedback control, and a current control circuit, Make the LED flow a steady current. The advantage of the constant current driving method is high efficiency and stable light emission, but for driving multiple strings of LEDs, it is necessary to add an additional current equalization circuit, which makes the efficiency worse; the advantage of the constant voltage driving method is that the circuit control is simp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 徐献松李立民余仲哲李海波
Owner GREEN SOLUTION TECH CO LTD