Device and method for controlling linear compressor

A control module for a linear compressor, comprising:

• a drive circuitry that is configured to drive the linear compressor based on a control signal;
• a detector to detect a motor current and a motor voltage corresponding to a motor of the linear compressor;
• an asymmetric current generator to generate an asymmetric motor current by applying a current offset to the detected motor current;
• and a controller to detect a stroke based on the detected motor voltage and to generate the control signal based on at least one of the asymmetric motor current, the detected motor voltage or the detected stroke, wherein the control signal adjusts motor speed to control the linear compressor, wherein the controller detects a phase difference between a phase of the asymmetric motor current and a phase of the detected stroke, and wherein the controller generates the control signal such that output power of the linear compressor is controlled based on the phase difference.