Shortening warm-up time with variable frequency control for projector lamp ballast

Tsorng Juu Liang, Chun An Cheng, Chia Ming Chuang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The UHP (ultra-high performance) lamp used in projectors is one of the high-intensity discharge lamps that exhibit negative resistance characteristics at high frequency. Therefore, an electronic ballast is used to generate sufficiently high voltage during start up and to provide stable arc current during steady state operation. This paper proposes a PWM variable frequency ballast to shorten the UHP startup period. The ballast circuit is composed of a half bridge series-resonant parallel-load inverter and a single-stage step-up igniter. A 120 W prototype was built to test and verify the characteristics of the proposed UHP lamp PWM ballast at cold start-up, hot re-strike, and steady state conditions. It was found that start-up time was reduced by nearly 50%. In addition, the power converter is designed to operate at zero-voltage-switching to reduce power losses.

Original languageEnglish
Title of host publicationProceedings of the Power Conversion Conference-Osaka 2002, PCC-Osaka 2002
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages90-94
Number of pages5
ISBN (Electronic)0780371569, 9780780371569
DOIs
Publication statusPublished - 2002 Jan 1
EventPower Conversion Conference-Osaka 2002, PCC-Osaka 2002 - Osaka, Japan
Duration: 2002 Apr 22002 Apr 5

Publication series

NameProceedings of the Power Conversion Conference-Osaka 2002, PCC-Osaka 2002
Volume1

Other

OtherPower Conversion Conference-Osaka 2002, PCC-Osaka 2002
CountryJapan
CityOsaka
Period02-04-0202-04-05

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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