Patent ID: 8278778

Claim:
A heating, ventilation, air conditioning, and refrigeration (HVAC/R) system, comprising: a rectifier electrically connected to a first AC power source; a first DC power source; a first power supply electrically connected to the rectifier and the first DC power source and configured to output three-phase AC power at variable frequencies; a first three-phase AC motor electrically connected to the first power supply; a phase change module electrically connected to the first power supply and configured to receive three-phase AC power from the first power supply and output single-phase AC power; a single-phase evaporator fan electrically connected to the phase change module and configured to receive single-phase AC power from the phase change module; and a control module electrically connected to the first power supply and configured to provide control signals to the first power supply; a condenser; an evaporator; and a pulsed operation control valve configured to control the flow of refrigerant between the condenser and the evaporator.