Smart power supply system for minimizing power consumption during device standby

A power supply adapter device, comprising:

• an input for mains power;
• a power output interface to supply mains power to an appliance or electronic device;
• a manually operable momentary switch to connect mains power to a power converter;
• a power switch circuit comprising:
• a circuit for activating a relay switch to connect mains power to a power converter and the mains power output interface;
• a programmable timer for deactivating said relay switch to disconnect mains power to the power converter and the mains power output interface;
• and ability to store previous timer settings, and using the timer history records to calculate a suitable value for future default setting of timer;
• an external interface for displaying timer status and to receive user input for programming the timer;
• a container for housing the power supply components, including an interface for mains power input and an interface for mains power output;
• a plurality of buttons for user to program the timer;
• and a plurality of indicator lights or an electronic display to show status of timer;