Bi-directional high-side current sense circuit for switch mode power supplies

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Abstract

In order to control a power supply using piezoelectric transformer, AC current in the transformer ne eds to be measured. Due to the control strategy it is necessary to measure amplitude, phase angle and zero crossing of this c urrent. In some applications there is common ground between pri mary and secondary sides of the transformer which is internally implemented inside the transformer. Therefore, curren t must be measured from the high voltage line in the presence of hig h input switching voltage. This paper proposes a resistive current s ensing circuit based on discrete components useful for input voltage s on the order of 200 V. The bandwidth is at least 200 kHz to allow fundamental frequency detection of piezoelectric transformers in use.
Original languageEnglish
Title of host publicationProceedings of Twenty-Ninth Annual IEEE Applied Power Electronics Conference and Exposition
PublisherIEEE
Publication date2014
Pages630-633
ISBN (Print)978-1-4799-4242-8
DOIs
Publication statusPublished - 2014
EventTwenty-Ninth Annual IEEE Applied Power Electronics Conference and Exposition - Fort Worth Convention Center , Fort Worth, TX , United States
Duration: 16 Mar 201420 Mar 2014
http://www.apec-conf.org/

Conference

ConferenceTwenty-Ninth Annual IEEE Applied Power Electronics Conference and Exposition
LocationFort Worth Convention Center
Country/TerritoryUnited States
CityFort Worth, TX
Period16/03/201420/03/2014
Internet address

Keywords

  • High side current sense
  • Resisitive curren t sense,
  • High common mode voltage
  • Piezoelectric transformer

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