Patent ID: 7570464
Filing Date: 2009-08-04
Classification: F04B,H02P

Abstract:
1. An overload protective apparatus of a compressor comprising: a reference current setting unit for pre-setting a reference current value for normally operating a compressor; a current detecting unit for detecting a current applied to the compressor; a comparing unit connected to the current detecting unit, the comparing unit receiving a detected current value of the current applied to the compressor from the current detecting unit and comparing the reference current value and the detected current value, the comparing unit generating a first power cutoff signal when the detected current value during operation of the compressor is greater than the reference current value and generating a first power supply signal when the detected current value is smaller than the reference current value; a microcomputer connected to the current detecting unit, the microcomputer receiving the detected current value of the current applied to the compressor from the current detecting unit and generating a second power cutoff signal when the detected current value during the operation of the compressor is greater than the reference current value, and for generating a second power supply signal when the detected current value is smaller than the reference current value, wherein the microcomputer receives the first power supply signal from the comparing unit and controls a turn-on period of a triac in a power supply unit to apply the power to an internal motor of the compressor, or receives the first power cutoff signal from the comparing unit and controls a turn-on period of an internal triac of the power supply unit to cut off the power applied to the internal motor of the compressor; and the power supply unit connected to the comparing unit and the microcomputer for receiving the first and second power cutoff signals and the first and second power supply signals, the power supply unit stopping supplying power to the compressor in response to at least one of the first and second power cutoff signals, the power supply unit supplying the power to the compressor in response to at least one of the first and second power supply signals, wherein the power supply unit stops supplying power to the compressor in response to either one of the first and second power cutoff signals, and the power supply unit supplies the power to the compressor in response to either one of the first and second power supply signals.