Power-supply controller of computer

Abstract

The power-supply controller of a computer can minimize power-consumption as shown in the following description. The operation mode will convert to a sleep-mode reducing the power-consumption below a constant voltage if there is no input to operate a computer system for a predetermined period of time. If the condition of no input for operating a computer system persists, the power supply controller cuts off the power-supply once again. In order to achieve this object, this invention is composed of a power-supply, a power-controller, and a power-mode-controller. The power-supply includes a first rectifier that converts an AC voltage to a DC voltage, a DC/AC converter which converts a DC voltage into an AC voltage, a switching mechanism which outputs a pulse signal used to operate the DC/AC converter, a second rectifier which converts to a DC voltage from an AC voltage received from the DC/AC converter, and a driver which provides an operation voltage to operate the switching mechanism. The power-controller outputs a power-supply signal used to change from the sleep-mode into a power-off mode if there is no input for a predetermined period during the sleep-mode, and which outputs a power-supply signal to change from the power-off mode into a resume-mode if there is an input. The power-mode-controller also includes a power-mode control circuit that varies the output from the power-controller and varies an operation voltage to operate the switching mechanism and a charger which charges a battery with AC voltage and provides the power-controller with a power-supply.