A new control method for a low frequency inverter of MHD lamp ballasts with a synchronous rectifier

I. K. Lee, B. H. Cho

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

In this paper, in order to improve the commutation characteristics of the low frequency bridge type ballasts, a new control method is proposed. It is characterized by the concept that the PWM controller modulates the output current with a square wave current reference and the inverting current rises monotonically. This method prevents the inverter from having an overshoot and a ringing problem on the inverted lamp current. As a result, the ZVS condition is maintained just after inverting and the restrike voltage of the lamp is minimized. Also, The principle of the proposed control is explained with an open loop description and the loss analysis of the improved inverter is performed. The new control scheme is adopted to a feedback controller and the operation is verified with the experimental results of a prototype 70W ballast.

Original languageEnglish
Pages1060-1064
Number of pages5
DOIs
Publication statusPublished - 2005
Event20th Annual IEEEApplied Power ElectronicsConference and Exposition, APEC 2005 - Austin, TX, United States
Duration: 2005 Mar 62005 Mar 10

Other

Other20th Annual IEEEApplied Power ElectronicsConference and Exposition, APEC 2005
CountryUnited States
CityAustin, TX
Period05/3/605/3/10

Keywords

  • 2-stage ballast
  • Coupled inductor
  • Low frequency inverter
  • Synchronous rectifier

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Lee, I. K., & Cho, B. H. (2005). A new control method for a low frequency inverter of MHD lamp ballasts with a synchronous rectifier. 1060-1064. Paper presented at 20th Annual IEEEApplied Power ElectronicsConference and Exposition, APEC 2005, Austin, TX, United States. https://doi.org/10.1109/APEC.2005.1453125