| 摘要 |
PURPOSE:To simplify a power supply circuit for an indoor machine by a method wherein a given DC voltage, outputted from the power supply circuit, is permitted to be used as at least the power supply of the control system of an air- conditioner in common. CONSTITUTION:An indoor machine is provided with a power supply circuit 11, consisting of a transformer 11a, a rectifying circuit 11b and a capacitor 11c for obtaining a given DC voltage from an input commercial power supply 2, a voltage control circuit 13 and a smoothing capacitor 14 for obtaining at least the power supply voltage of a DC brushless motor control circuit 12 from a given DC power supply. On the other hand, the DC brushless motor control circuit 12 effects the chopping of base signals of respective transistors of a lower arm for a switching circuit 5 and changes the ON-duty ratio of the chopping based on the information on number of rotation. Further, a power supply voltage for a microcomputer 7 for controlling an air-conditioning system is obtained by a voltage control circuit 13 and a power supply circuit such as an actuator and the like of the indoor machine can be constituted of a voltage control circuit, a capacitor and the like without employing any transformer and the like. |
