Our lifestyle is surrounded by a variety of power electronic products including inverter air conditioners, inverter fluorescent lamps, refrigerators, motors, amplifiers, and UPS’s. The power control boards for these products contain microcomputers that gauge load conditions to allow optimum control. For example, the microcomputers in air conditioners estimate the current load to perform a precise noise and temperature control. This is accomplished by changing the rotary speed of the motor and without any restrictions to the motor inverter. Similarly, the inverter control panel in fluorescent lamps inhibit the flickering with continuous high frequency lighting.