System for controlling compressor operation

A system for controlling the operation of a vibrating compressor using a predetermined frequency corresponding to the load thereof, and characterized in that said controlling method comprises at least a first sensor for detecting a first parameter of a refrigerant sucked by said compressor, a second sensor for detecting a second parameter of said refrigerant compressed and discharged by said compressor, a parameter sensing section for converting signals detected by said first and second sensors into predetermined electrical signals, a computing section for generating an output having a predetermined frequency based on said electrical signals from said parameter sensing section, a drive circuit for generating a drive signal in accordance with an output fed from said computing section, switching elements which are turned on and off by said drive circuit, a transformer for supplying an output from said switching elements and an alternating current power in an a-c operation, a switching interruption circuit means for interrupting the operation of said switching elements, a temperature setting device for detecting the temperature of an object being refrigerated by said refrigerant, a temperature comparator for generating a control signal based on a detected temperature signal from said temperature setting device an a-c sensor for detecting the occurrence of said a-c operation, a surge absorbing circuit for monitoring a d-c voltage for feeding a d-c power to said switching elements, and an overcurrent sensing circuit for detecting an overcurrent fed by said switching elements, and characterized in that said switching elements are turned off in response to the output from said temperature comparator, said a-c sensor and said overcurrent sensor via said switching interruption circuit means while said compressor is driven by turning on and off said switching elements, and the magnitude of vibrating stroke in said vibrating compressor is controlled by controlling said switching elements based on the output of said surge absorbing circuit.

A system for controlling the operation of a vibrating compressor having an evaporator and a refrigerator comprising:

• a first temperature sensor for detecting the temperature of a refrigerant sucked by said compressor;
• a second temperature sensor for detecting a temperature of the refrigerant compressed and discharged by the compressor;
• control means for converting signals detected by said first and second temperature sensors into predetermined electrical signals;
• computing means for generating an output having a predetermined frequency based on the electrical signals provided by the temperature sensing section corresponding to a frequency at which the compressor can operate at the resonant frequency;
• a drive circuit for generating a drive signal corresponding to said output supplied by said computing section;
• a temperature comparator for comparing the temperature signal corresponding to said first temperature sensor and the temperature signal corresponding to said second temperature sensor;
• and, a switching interruption means for interrupting switching elements provided in said control means so as to interrupt the operation of said switching elements in accordance with signals produced by said temperature comparator means.

A system for controlling the operation of a vibrating compressor comprising:

• a sucked refrigerant temperature sensor for detecting a temperature corresponding to the saturated vapor pressure of a refrigerant sucked by the compressor;
• a discharged refrigerant temperature sensor for detecting a temperature corresponding to the saturated vapor pressure of the refrigerant compressed and discharged by said compressor;
• computing means for generating an output having a predetermined frequency at which the compressor can operate at the resonant frequency based on the sucked and discharged refrigerant temperature sensed corresponding to the saturated vapor pressure of the refrigerant sucked and discharged;
• and, a drive circuit for generating a drive signal corresponding to outputs Q and Q having the frequency corresponding to the output fed by said computing means.