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Self-adaptive output white light LED driver

A light-emitting diode and output driver technology, applied in the field of adaptive output driver, can solve the problems of small power selection range, peripheral circuit damage, low power use efficiency, etc., and achieve the effects of fewer peripheral devices, lower power consumption, and improved utilization efficiency

Active Publication Date: 2006-10-11
WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The step-down circuit alone implements a step-down process, which requires the power supply voltage to be greater than the rated output voltage. When the power supply voltage is lower than the rated output voltage, it will not be able to continue to work, so the power supply has a large part of the energy (the part of the power supply voltage lower than the rated output voltage). use, the efficiency of power supply (especially portable power supply such as batteries) is low; the boost circuit realizes a boost process alone, requiring the power supply voltage to be less than the rated output voltage, when the power supply voltage exceeds the rated output voltage, the power supply voltage will pass through the peripheral circuit directly If it is added to the output terminal, it may cause damage to the peripheral circuit, so the selection range of the power supply is small

Method used

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  • Self-adaptive output white light LED driver
  • Self-adaptive output white light LED driver

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Embodiment Construction

[0019] This circuit is composed of an output driver stage 1, an output control circuit 2, a PWM controller 3, an error amplifier 4, a starting module 5, an oscillator 6, and a reference voltage 7.

[0020] The output control, output driver stage and drive tube are given here.

[0021] Other components are as follows:

[0022] The input capacitance of Cin is an electrolytic capacitor of 1uF,

[0023] The Cout output energy storage capacitor is an electrolytic capacitor of 100uF,

[0024] L energy conversion inductance is 68uH inductance,

[0025] RL is the load,

[0026] D is an ordinary diode,

[0027] In the self-adaptive output white light emitting diode driver of the present invention, the control terminal of the driving tube Q is connected to the output driver stage 1 and the output control circuit 2, and the output terminal of the driving tube Q is connected to the negative terminal of the inductance coil L and the diode D, and the diode D The positive terminal of th...

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Abstract

The adaptive output driver of white light LED comprises: connecting drive tube (Q) with control end and output end to output drive end (1) with inlet connected outlet of PWM controller (3) and the output control circuit (2), negative ends of the induction coil (L) and diode (D), respectively; paralleling an output capacitor (Cout), a load resistance (RL), and two serial first and second feedback resistances (Ra and Rb) between diode poles; connecting another end of (Q) to power (VIN), connecting inverse-phase inlet of (3) to outlet of error amplifier (4) with inlet linked to the joint point of said feedback resistors, and in-phase inlet to startup module (5) and oscillator (6).

Description

technical field [0001] The invention relates to a self-adaptive output driver for white LEDs, which belongs to the technical field of white LED drives for power management. Background technique [0002] Currently, there is no such self-adaptive, buck-boost white LED driver IC on the market. [0003] At this stage, the simple step-up or step-down circuits driven by NMOS are used to achieve similar purposes or effects in the market. The application range is relatively narrow, and the selection range of power supply is small. The step-down circuit alone implements a step-down process, which requires the power supply voltage to be greater than the rated output voltage. When the power supply voltage is lower than the rated output voltage, it will not be able to continue to work, so the power supply has a large part of the energy (the part of the power supply voltage lower than the rated output voltage). use, the efficiency of power supply (especially portable power supply such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/02
Inventor 朱伟民朱洲张国伟韦良忠
Owner WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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