Intelligent magnetic amplifier controlled soft-switching method for amplifiers/inverters

Author

Smith, K. Mark ; Smedley, Keyue M.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA

fYear

1996

fDate

6-10 Oct 1996

Firstpage

698

Lastpage

706

Abstract

This paper proposes a simple, efficient soft-switching method for power switching converters. Soft switching of the DC/AC H-Bridge converter is realized by paralleling two auxiliary switches and a magnetic amplifier with the load. The auxiliary switches are turned on at a predetermined time before the commutation of the main switches. The magnetic amplifier then automatically determines the necessary amount of redirection current to ensure soft switching of all switches under any load conditions. This method requires no expensive sensors or complex control circuitry. It is ideal for class-D audio power amplifiers where the load current is widely changing. Further applications include DC/DC converters, motor drivers, UPS, communication, and space applications where high efficiency, low EMI and small size are crucial

Keywords

DC-AC power convertors; audio-frequency amplifiers; bridge circuits; invertors; magnetic amplifiers; magnetic cores; switching circuits; DC/AC H-Bridge converter; DC/DC converters; UPS; amplifiers; auxiliary switches; auxiliary switches paralleling; class-D audio power amplifiers; communication; commutation; controlled soft-switching method; high efficiency; intelligent magnetic amplifier; inverters; load current; low EMI; magnetic core selection; motor drivers; power switching converters; redirection current; small size; space applications; Analog-digital conversion; Automatic control; Circuits; Communication switching; Communication system control; Commutation; Magnetic sensors; Magnetic switching; Switches; Switching converters;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Energy Conference, 1996. INTELEC '96., 18th International

Conference_Location

Boston, MA

Print_ISBN

0-7803-3507-4

Type

conf

DOI

10.1109/INTLEC.1996.573411

Filename

573411