Drive circuit of light emitting diode

A technology of light-emitting diodes and driving circuits, which is applied to semiconductor devices of light-emitting elements, circuit layout, electric lamp circuit layout, etc., can solve problems such as inability to accurately adjust brightness and different target brightness.

Inactive Publication Date: 2009-12-09
普照光电科技股份有限公司
View PDF21 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the non-linear relationship of the current passing through the LED 14, its change percentage is not consistent with the change of the output voltage, resulting in the change percentage of the LED 14 luminous brightness being different from the expected target brightness, and it is impossible to accurately adjust the brightness to a specific value.

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
  • Drive circuit of light emitting diode
  • Drive circuit of light emitting diode
  • Drive circuit of light emitting diode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] see figure 2 , is a circuit block diagram of a preferred embodiment of the present invention. As shown in the figure, the driving circuit 20 of the light emitting diode (LED) of the present invention mainly includes a voltage source 24, at least one driving module (26, 28), at least one LED (251, 253) and a programmable controller twenty two. In this embodiment, two sets of drive modules 26 and 28 are used as an example for illustration.

[0055] Wherein, each driving module 26 , 28 includes a switch circuit 261 , 281 and a current and voltage detector 265 , 285 respectively, and each driving module 26 , 28 is connected to an LED 251 , 253 respectively. Wherein, the LED 251 and 253 can be one LED, or multiple LEDs connected in series or in parallel.

[0056] The switch circuits 261, 281 of the driving modules 26, 28 are respectively connected to the voltage source 24, and the LEDs 251, 253 and the corresponding current and voltage detectors 265, 285 are respectively...

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 drive circuit of a light emitting diode, in particular to a drive circuit of the light emitting diode, which can be accurately controlled and accurately dim light. The drive circuit mainly comprises a voltage source for proving working voltage, at least one drive module, at least one light emitting diode and a programmable controller, wherein each drive module comprises a switch circuit and a current and voltage detector respectively. The drive circuit utilizes the programmable controller to connect the switch circuit and the current and voltage detector of each drive module, can adjust a switch state of the switch circuit according to a current signal or a voltage signal of the current and voltage detector and respectively and accurately control current passing through each light emitting diode or voltage applied to each light emitting diode.

Description

technical field [0001] The invention relates to a driving circuit of a light emitting diode, in particular to a driving circuit of a light emitting diode capable of precise control and precise dimming. Background technique [0002] see figure 1 , is a block diagram of an existing light-emitting diode (LED) driving circuit. As shown in the figure, it mainly uses a voltage source 12 to provide a working voltage to an LED 14 , the LED 14 is connected to a switch circuit 165 , and a current detector 18 is connected in series behind the switch circuit 165 . [0003] Wherein, the current detector 18 is usually a resistor, and detects the current by using the voltage drop generated by the current flowing through the resistor. Connect the current detector 18 to a comparator circuit 161, compare the voltage obtained by the current detector 18 with the triangular wave 169 generated by a waveform generator 163, when the voltage of the triangular wave 169 is greater than the voltage o...

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 Applications(China)
IPC IPC(8): H05B37/00H05B37/02F21V23/00F21Y101/02F21Y115/10
Inventor 陈元杰石晏竹
Owner 普照光电科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap