Linear-compressor control system, a method of controlling a linear compressor and a linear compressor

A linear-compressor control system comprising an electronic circuit controlling a linear compressor through an electric motor, the linear compressor comprising a cylinder and a piston;

• the piston being arranged inside the cylinder and being driven by the electric motor and moving axially within the cylinder along a piston stroke between a top dead end and a bottom dead end, a compression chamber being arranged close to the top dead end and the piston compressing a fluid within the compression chamber, wherein:
• the electronic circuit controls the electric motor intermittently through an on-time (tL) and an off-time (tD), throughout a time of operation of the linear compressor,
• the linear compressor being associated to a cooling closed circuit that comprises an evaporator and a condenser, a compressed fluid within the compression chamber being discharged into the cooling closed circuit, generating an evaporation pressure (PE) inside the evaporator and a condensation pressure (PC) inside the condenser, the evaporation pressure (PE) and the condensation pressure (PC) being kept constant throughout the time of operation of the linear compressor through an average value of on-time (tL) of compressor capacity throughout the time of operation of the linear compressor,
• the electronic circuit actuating the electric motor and keeping the piston stroke constant, generating a constant compression capacity while the electronic circuit controls the electric motor for operation during the on-time (tL),
• the system being configured so that the electronic circuit controls the on-time (tL) and the off-time (tD) to keep the compression capacity substantially constant throughout the time of operation of the linear compressor, and
• the off-time (tD) being shorter than a time necessary for the evaporation pressure (PE) and the condensation pressure (Pc) to match each other after the linear compressor has been turned off.