Title :
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
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;
Conference_Titel :
Telecommunications Energy Conference, 1996. INTELEC '96., 18th International
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-3507-4
DOI :
10.1109/INTLEC.1996.573411
