Patent ID: 8169180

Claim:
A motor controller of an air conditioner, comprising: a converter including a plurality of converter switching elements, the converter receiving AC power and converting the received AC power into DC power through a switching operation of the converter switching elements; an inverter including a plurality of inverter switching elements, the inverter receiving the DC power, converting the DC power into AC power through a switching operation of the plurality of inverter switching elements and driving a motor; a converter gate driver to control the switching operation of the converter switching elements; an inverter gate driver to control the switching operation of the inverter switching elements; a rectifier unit to rectify the AC power; a microcomputer to control at least one of the converter gate driver or the inverter gate driver; and a plurality of voltage drop units to drop the rectified voltage from the rectifier unit and supply the dropped voltage to at least one of the converter gate driver, the inverter gate driver, or the microcomputer, wherein first to third voltage drop units of the voltage drop units supply the driving voltages to three inverter upper arm switching elements, respectively, and wherein the microcomputer controls the converter gate driver and the inverter gate driver together, and wherein the first voltage drop unit further supplies a driving voltage to the microcomputer.