LED (Light Emitting Diode) driving circuit

A technology of LED driving and driving current, which is applied in the direction of lamp circuit layout, electric light source, electrical components, etc. It can solve the problems of circuit restart, difficult control of start-up signal, sudden change of circuit inductance current, etc., and achieve overshoot suppression and continuous stability Active, controllable effects

Active Publication Date: 2014-01-29
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
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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

An LED driver described herein can determine whether it is operating in z soft-start process by comparing a first threshold value and a soft-start reference value. In the soft-start process, the inductor current and the LED driving current can be soft-started periodically to effectively avoid current overshoot. In addition, the end of the soft-tart operation can be controlled based on a comparison result of the first threshold value and the reference value of the soft-start, and without any external settings. Thus, the end of soft-start operation can automatically be determined with strong controllability.

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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Patent Type & Authority Patents(China)
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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