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

Light-emitting diode driving circuit with wide operating voltage range

A technology of light-emitting diodes and driving circuits, which is applied in the direction of instruments, static indicators, identification devices, etc., and can solve the problems of increasing power consumption of current sources and reducing the range of operable voltages

Active Publication Date: 2013-07-31
SAMSUNG ELECTRONICS CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Assuming that the switching voltage Vb' is increased to meet most non-ideal light-emitting diodes, if the voltage detection circuit 410 turns on the current source IS when Vf=Vb' 1 , the excess voltage (Vb’-Vb1) will not only increase the current source IS 1 power consumption, will also reduce the operating voltage range

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 driving circuit with wide operating voltage range
  • Light-emitting diode driving circuit with wide operating voltage range
  • Light-emitting diode driving circuit with wide operating voltage range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Please refer to Figure 4 and Figure 5 , Figure 4 It is a schematic diagram of a LED driving circuit 100 in the first embodiment of the present invention, and Figure 5 It is a schematic diagram of an LED driving circuit 200 in the second embodiment of the present invention. The LED driving circuit 100 includes a current selection circuit 120 , and the LED driving circuit 200 includes a current selection circuit 220 capable of driving a light emitting element 10 connected in series with a power supply circuit 110 .

[0025] The power supply circuit 110 includes a voltage source VS and a bridge rectifier 20 . The voltage source VS can output an AC voltage with positive and negative cycles, and the bridge rectifier 20 can convert the output voltage of the voltage source VS in a negative cycle, so the power supply circuit 110 can provide a DC voltage Vf to drive the light-emitting component 10, wherein DC The value of the voltage Vf changes periodically with time. 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 discloses a light-emitting diode driving circuit with a wide operating voltage range. The light-emitting diode driving circuit comprises a current selection circuit which can be used for controlling current paths in a plurality of light-emitting units according to individual critical voltage and a plurality of groups of current limiting values corresponding to light-emitting diodes in a plurality of light-emitting units.

Description

technical field [0001] The invention relates to a light-emitting diode driving circuit, in particular to a light-emitting diode driving circuit with a large operating voltage range. Background technique [0002] In recent years, applications of light emitting diodes (light emitting diodes, LEDs) have been continuously developed. Compared with incandescent bulbs, light-emitting diodes have the advantages of low power consumption, long component life, small size, no need for warm-up time, and fast response. Therefore, it is easy to make extremely small or array components to meet application requirements. It is widely used in indicator lights or display devices of various information, communication and consumer electronics products. In addition to being used in various outdoor displays and traffic lights, LEDs are also widely used in portable products, such as mobile phones, notebook computers, or LCD screen backlights of personal digital assistants (PDAs). [0003] Please r...

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): G09G3/32G09F9/33
CPCY02B20/46Y02B20/40
Inventor 康金锋林孟宏
Owner SAMSUNG ELECTRONICS CO LTD