Abstract: A compressor control system including a controller for controlling the operation of a compressor, a power source unit for supplying power to the compressor, and a power converting device for subjecting the power from the power source unit to conversion processing and then supplying the power thus converted to the controller, the controller being reset on the basis of input of a reset signal to stop said compressor, is further provided with a power monitoring device for monitoring a power state (e.g., power failure or not) of the power source unit, and outputting the reset signal to the controller when the power supply of the power source unit is intercepted.

Abstract: According to the microprocessor malfunction operation preventing circuit of this invention, when the source voltage of a microprocessor is reduced to a prescribed voltage level between the value of a second source voltage (battery voltage) and the upper limit value of an operation unsteady region of the microprocessor, the microprocessor is enforcedly reset. Therefore, the microprocessor can be prevented from falling into its malfunction operation state, and the microprocessor can be freely actuated with any one of the main power source and the auxiliary power source.