Patent ID: 8469674
Filing Date: 2013-06-25
Classification: F04B,H02P

Abstract:
1. An operation control device of a compressor, comprising: a capacitor electrically connected to a motor of the compressor and having a predetermined capacitance; a control unit connected in series to the motor of the compressor and applying an AC power to the motor of the compressor according to a control signal; a controller estimating a stroke by a current and voltage applied to the motor of the compressor, detecting a load variation amount on the basis of a phase difference between the estimated stroke and the current and controlling on/off of the control unit according to the detected load variation amount; and a switch unit for selecting the front end or rear end of the control unit, being switched by the control signal of the controller, wherein if the detected load variation amount is larger than a preset reference load variation amount, the controller varies the AC power to the motor of the compressor by controlling a turn-on/turn-off period of the control unit after connecting the switch unit to the rear end of the control unit, and wherein if the detected load variation amount is smaller than the preset reference load variation amount, the controller applies the AC power to the motor of the compressor without the control unit by connecting the switch unit to the front end of the control unit.