FM/PWM control scheme in class DE inverter

Hiroo Sekiya, Hirotaka Koizumi, Shinsaku Mori, Iwao Sasase, Jianming Lu, Takashi Yahagi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


This paper presents a new control scheme for a Class DE inverter, that is, frequency modulation/pulsewidth modulation (FM/PWM) control. Further, the FM/PWM controlled Class DE inverter is analyzed and we clarify performance characteristics. Since the FM/PWM controlled inverter has two control parameters, namely, the switching frequency and the switch-on duty ratio, it has one more degree of freedom for the control than the inverter with the conventional control scheme. The increased degree of freedom is used to minimize the switching losses. Therefore, it is possible to control the output power with high power-conversion efficiency for wide-range control. Carrying out the circuit experiments, we confirm that the experimental results agree well with the theoretical predictions quantitatively. For example, the proposed controlled inverter can control the output voltage from 56% to 191% of the optimum one, which is designed for 1.8 W at 1.0 MHz, with maintaining over 90% power-conversion efficiency.

Original languageEnglish
Pages (from-to)1250-1260
Number of pages11
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number7
Publication statusPublished - 2004

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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