Micro-trak Systems, Inc.

Jeffrey B Colter

Power from a DC power source, such as a 12 volt RV or boat battery, is boosted and converted to provide an AC signal suitable for operating an induction motor such as a refrigerator compressor motor. The converter provides voltage pulses having a substantially constant width. The converted voltage signal frequency is initiated at a low frequency and ramps up to 60 Hz. A start winding control circuit is provided for activating the start winding for a limited initial period. A thermostat for controlling the activation of the compressor motor is connected in series with the motor load such that shutting off the compressor disconnects the motor from the circuit. Control circuitry monitors under voltage, over voltage, overcurrent, AC switching, and adequate delay before restart and controls the circuitry accordingly.

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Minneapolis, MN, United States of America

Jeffrey B Colter