Importance

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Abstract

A computer incorporates therein a control system for efficiently turning on and off a power supply on and off therein to control on-off operations of the computer. In the control system, a power detection signal is derived first based on a power selection signal generated when a power on/off key of the computer is actuated to control the on-off operations of the computer at a signal detector. And then, at a first generator, a first power control signal and a selection control signal are obtained from the derived power detection signal in response to a first mode control signal. Next, a second power control signal is derived from the power detection signal, the selection control signal and a second mode control signal at a second generator. Finally, the first and the second power control signals are logically combined at a second logic circuit to generate and provide a definitive power control signal to the power supply, thereby selectively supplying DC output voltages to designated components of the computer to control the on-off operations of the computer.

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First Claim