| 摘要 |
A circuit is described for connection between an appliance and a power supply. The circuit detects when the appliance is operating in a standby mode and automatically isolates the appliance from the power source either immediately or after a predetermined length of time of operation in the standby mode. The circuit may incorporate a micro-controller 18 which measures the applied voltage after initial start up and averages it over a period of time, typically one minute; this period allows the current drawn by the appliance to reach a steady state and also enables short current spikes to be disregarded. The circuit may incorporate a triac 12. |
