An LED Drive Circuit with Constant-Output-Current Control and Constant-Luminance Control

Masahiro Nishikawa; Yoichi Ishizuka; Hirofumi Matsuo; Koichi Shigematsu

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https://doi.org/10.1109/intlec...

Article . 2006 . Peer-reviewed

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An LED Drive Circuit with Constant-Output-Current Control and Constant-Luminance Control

descriptionPublicationkeyboard_double_arrow_right Article 01 Sep 2006Publisher:IEEEJournal:INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference

Authors: Masahiro Nishikawa; Yoichi Ishizuka; Hirofumi Matsuo; Koichi Shigematsu;

doi: 10.1109/intlec.2006.251597

An LED Drive Circuit with Constant-Output-Current Control and Constant-Luminance Control

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Abstract

A Single LED is very small, and their luminance is related to the amount of driving current. Sufficient luminance for an illuminator requires many LEDs to be connected together and a constant current supplied to each LED. Therefore, the LED drive circuit must have constant-output-current control and/or constant-luminance control. We propose an LED drive circuit that consists of a boost-type DC-DC converter with constant-output-current control and constant-luminance control. This circuit is a switching regulator-type circuit controlled by pulse width modulation (PWM). Both the power and the constant-current control can be provided by a single system, without any ballast resistor or auxiliary current control circuit.

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