| 摘要 |
A control apparatus for controlling motors of an air conditioner comprises: a converter circuit (2) for converting an AC power (1) to a DC power and setting the input voltage of an input alternating current waveform to a sine wave of the same phase as that of the input current by at least switching means (2a); first and second brushless motors (3,12) for driving a compressor (33) and a blower (34); first and second inverter circuits (4,13) for converting the converted DC power to the AC powers and supplying them to the motors; and a microcomputer (25) for controlling at least the compressor and blower of the air conditioner. In order to improve the input power factor from the AC power, a PWM signal to on/off control the switching means (2a) included in the converter circuit (2) to obtain the DC powers for the inverter circuits is generated in the microcomputer on the basis of the input alternating current of the AC power and the output DC voltage (at 22) of the converter circuit and is outputted. At the same time, PWM signals to on/off control switching means (Ua-Za, Ub-Zb) of the inverter circuits (4,13) are generated in the microcomputer (25) and outputted in order to inverter control the motors. <MATH> |
