Patent ID: 6857858
Filing Date: 2005-02-22
Classification: F04B

Abstract:
1. A device for controlling a piston position in a linear compressor, having a power source, a triac, and a motor, comprising: a current phase detecting part for detecting a current switched at the triac, integrating the current, and generating a first square wave corresponding to the integrated current; a stroke phase detecting part for generating an AC voltage waveform having a fixed frequency and varied amplitude according to a piston reciprocation position following motor operation, and generating a second square wave corresponding to the AC voltage waveform; a zero cross detecting part for detecting a zero crossing of the voltage supplied from the power source; and, a controlling part for generating a signal for controlling a piston position according to a phase difference of the first square wave detected at the current phase detecting part and the second square wave detected at the stroke phase detecting part.