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

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This paper proposes a simple efficient soft-switching method for switching power converters, inverters, and amplifiers. Soft switching of a 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 deter mines 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, uninterruptible power supply (UPS), communication, and space applications, where high efficiency, low electromagnetic interference (EMI), and small size are crucial.

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IEEE Transactions on Power Electronics

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