CONTROL DEVICE FOR REFRIGERATOR

PROBLEM TO BE SOLVED: To prevent abnormal control of a control load outputting a signal according to power supply frequency by judging abnormality when pulses generated at a zero point of power supply voltage waveform are abnormally input because of noise and the like. SOLUTION: This control device for a refrigerator comprises a zero-cross pulse generating means 1 generating a pulse signal at every time when the power supply voltage waveform passes the zero point, a zero-cross pulse determining means 2 determining the input of a zero-cross pulse signal, and a control means 3 controlling the output of AC load in synchronization with the zero point of power supply voltage waveform. The abnormality is determined when an interval of input of the zero cross pulse signals is not within a prescribed time, thus erroneous determination can be prevented when the zero cross pulse signal is abnormally input because of noise and the like, and the abnormal control of AC load in synchronization with the zero point of the power supply voltage waveform can be prevented. COPYRIGHT: (C)2007,JPO&INPIT