Simple digital PWM and PSM controlled DC-DC boost converter for luminance-regulated WLED driver

doi:10.1016/S1005-8885(08)60211-3

Acta Metallurgica Sinica(English letters) ›› 2009, Vol. 16 ›› Issue (2): 98-102.doi: 10.1016/S1005-8885(08)60211-3

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Simple digital PWM and PSM controlled DC-DC boost converter for luminance-regulated WLED driver

LIU Xin, GUO Shu-xu, CHANG Yu-chun, ZHU Shun-dong, WANG Shuai

State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, China

Received:1900-01-01 Revised:1900-01-01 Online:2009-04-30
Contact: LIU Xin

Abstract

Abstract:

This article presents a control strategy based on simple digital pulse-width modulation (DPWM) and pulse-skip modulation (PSM) for a DC-DC boost converter, to drive a luminance-regulated white light emitting diodes (WLEDs). The presented control strategy not only retains most of the advantages and flexibilities of traditional digital PWM, but also reduces complexity and cost. Based on analyzing the principle of the presented control strategy, the white light emitting diode (WLED) driver is designed and simulated using the 0.6 m CMOS process. Simulation results of the boost converter show that the power efficiency is above 76% for a full load, with a peak efficiency of 88% when supply voltage varies from 2.7 V to 5.5 V. The control strategy overcomes low efficiency for PWM mode with light load.

Key words:

DC-DC boost converter;DPWM;PSM;WLED

LIU Xin, GUO Shu-xu, CHANG Yu-chun, ZHU Shun-dong, WANG Shuai. Simple digital PWM and PSM controlled DC-DC boost converter for luminance-regulated WLED driver[J]. Acta Metallurgica Sinica(English letters), 2009, 16(2): 98-102.

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Simple digital PWM and PSM controlled DC-DC boost converter for luminance-regulated WLED driver

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