Patent ID: 8100668
Filing Date: 2012-01-24
Classification: F04B

Abstract:
1. An apparatus of controlling an operation of a reciprocating compressor comprising: a first control unit for detecting a phase difference between current and stroke and outputting a frequency inflection point detect signal or a frequency variable signal; a stroke reference value control unit for determining whether a frequency inflection point has been detected or not according to the frequency inflection point detect signal and outputting a stroke reference value control signal based on the determining result; a PWM (Pulse Width Modulation) signal generating unit for generating a PWM signal based on a difference value between a stroke reference value and a current stroke reference value, or generating a PWM signal based on the frequency variable signal; and an inverter for varying voltage and frequency applied to a motor according to the PWM signal, wherein the PWM signal generating unit analyzes the frequency variable signal, and if the phase difference is greater than a pre-set reference range, the PWM signal generating unit generates the PWM signal for increasing the frequency.