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LED (Light Emitting Diode) driving circuit

A LED drive and circuit technology, applied in the direction of lamp circuit layout, electric light source, electrical components, etc., can solve the problems of circuit restart, sudden change of circuit inductance current, difficult control of start-up signal, etc., to achieve overshoot suppression, continuous and stable start , highly controllable effect

Active Publication Date: 2012-09-26
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This circuit scheme can realize the non-overshooting of the inductor current and the output voltage, but there are still the following problems: During the soft start process, because the switch tube will be turned off or turned on for a minimum period, the circuit will have a sudden change in the inductor current and the circuit will restart
The end of the soft start is controlled by an externally set start end signal, but the start end signal is not easy to control

Method used

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  • LED (Light Emitting Diode) driving circuit
  • LED (Light Emitting Diode) driving circuit
  • LED (Light Emitting Diode) driving circuit

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Embodiment Construction

[0040] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0041] refer to figure 2 , shows a functional block diagram of the first embodiment of an LED drive circuit according to the present invention; wherein the topology of the main circuit is preferably composed of an inductor L, a diode D, and a switch tube S M and the output capacitor C outThe composed boost circuit also includes an erro...

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Abstract

The invention discloses an LED (Light Emitting Diode) driving circuit. According to the LED driving circuit disclosed by the invention, whether the LED driving circuit works in a soft starting state or not can be judged by comparing a first threshold value with a soft starting reference value, the inductive current and the LED driving current can be subjected to soft starting in stages during a soft starting process, thus the overshoot of the inductive current and the LED driving current can be effectively restrained, and the continuous stable start of the LED driving circuit can be realized; and in addition, the end of the work of a soft starting circuit can be controlled by a comparing result of the first threshold value and the soft starting reference value, the end of the soft starting work state can be automatically judged without an external device, and the controllability is strong.

Description

technical field [0001] The invention relates to an LED driving circuit, in particular to an LED driving circuit with a soft start function. Background technique [0002] Traditional LED drive circuits usually adopt a current control mode with fast dynamic response and good regulation. However, the LED drive circuit using this mode needs to add a soft-start circuit in the initial stage of start-up to control the output voltage and inductor current to change slowly to achieve a smooth start-up of the circuit, so as to prevent the output voltage from overshooting and surge on the device. the emergence of current. [0003] Chinese invention patent CN101841238A discloses a step-up DC / DC converter and its internal logic control circuit, its principle block diagram is as follows figure 1 shown. During the startup process, the soft start circuit selects the reference voltage of the feedback circuit generated by charging the capacitor through the current source. When the judgment ...

Claims

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Application Information

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IPC IPC(8): H05B37/02H05B44/00
CPCY02B20/42H05B33/0851H05B33/0815H05B37/0281H05B45/10H05B45/38H05B45/14H05B47/16
Inventor 陈君范洪峰
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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