Importance

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Abstract

A control circuit is provided for a power-saving socket and includes a central processing unit, a relay, a sensor unit, a time counting unit, a standby current setting unit, and a current monitoring unit. The central processing unit, upon receiving a human approaching signal from the sensor unit, issues a control signal to the relay to switch a contact of the relay to a closed condition, whereby an electrical appliance plugged to the socket is allowed to operate. When the electrical appliance plugged to the socket stays in a standby mode, the central processing unit receives a current value from the current monitoring unit, which is equal to or smaller than an appliance standby current level, and the time counting unit starts time counting for a specific period of time. Once the detected current value from the current monitoring unit maintains equal to or smaller than the appliance standby current level within the whole specific period of time, the central processing issues a control signal to the relay to switch the contact of the relay to an open condition, whereby power supplied to the electrical appliance plugged to the socket is completely cut off and the electrical appliance consumes no standby power. In this way, power saving can be achieved.

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First Claim