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

LED driver and method for driving LED

A light-emitting diode and LED driver technology, applied in the field of driving LEDs and light-emitting diode drivers, can solve problems such as not optimal system performance, low efficiency, and complexity, and achieve the effects of small size, high efficiency, and fewer components

Inactive Publication Date: 2012-07-18
HUNAN LIXIN ELECTRONICS TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the switch utilization is higher, but the efficiency is lower
In addition, the design of the power circuit and feedback loop of a 4-switch Buck-Boost converter is much more complicated than that of a simple buck and boost converter, requiring the use of multiple components and parameters to satisfy both buck converter and boost conversion. requirements of both, which often results in suboptimal system performance

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
  • LED driver and method for driving LED
  • LED driver and method for driving LED
  • LED driver and method for driving LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or similar reference numerals indicate the same or similar elements throughout.

[0027] figure 2 The circuit structure of the LED driver according to the first embodiment of the present invention is shown. in figure 2 In the shown LED driver 100, the power circuit is similar to a synchronous boost converter, but the circuit control method is improved.

[0028] Such as figure 2 As shown, the LED driver 100 includes an inductor 101, switches 102 and 103, and a control module 104. The inductor 101 is connected to a power source, such as a battery, at one end, and connected to the switch 102 at the other end. The other end of the switch 102 is connected to the LED (shown as a load resistance in the figure). One end of the switch 103 is connected to the connection point between the inductor 101 and the switch 102, an...

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 LED driver and a method for driving LED. The LED driver includes: an inductor that one end connects with an input voltage electrical power source; a first switch that is connected in series between one end of the inductor and a load; a second switch that is connected with a connection point between the inductor and the first switch; and a control module when an input voltage is less than an output voltage needed for driving LED normal work, the control module switches the first switch and the second switch is switched complementary for LED driver working in boosting voltage mode, when the input voltage is more than the output voltage, the control module cuts off the second switch and adjusts the first switch for the LED driver working in a line reducing voltage mode. The LED driver and the driving method can change operation mode self-adopted and drive LED efficiently. The LED driver has lower cost and smaller size with keeping high efficiency.

Description

Technical field [0001] The present invention relates to a light emitting diode (LED) driver and a method for driving the LED. Background technique [0002] As a lighting source, white light emitting diodes (LEDs) have been widely used in many fields, including flashlights, liquid crystal display (LCD) backlights, automotive headlights, architectural lighting, and so on. Compared with traditional light sources (such as incandescent lamps, fluorescent lamps, metal halide lamps, etc.), white LEDs mainly have the following advantages: high efficiency; good directionality, good color stability; high reliability and long life; small size; environmental safety Good sex. Another advantage of white light LEDs is the low operating voltage. Depending on the current level and different manufacturers, the operating voltage range of a single white light LED is 2.7V to 4.5V. [0003] Many white LED applications, such as flashlights, mobile phones, laptop computers and other portable devices, re...

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 陈煜辉谢刚军
Owner HUNAN LIXIN ELECTRONICS TECH