Patent ID: 8836174

Claim:
An energy-saving power supply system comprising: a transformer including a primary winding and a secondary winding; a first plug connector for electrically coupling the transformer to a power source, the first plug connector including a first plug terminal and a second plug terminal, the first plug terminal being electrically coupled to a first end of the primary winding; and a second plug connector including a first plug portion and a second plug portion, the first plug portion having a shape that mates with the second plug portion, the first plug portion including at least one power terminal configured for electrically coupling the secondary winding of the transformer to a device, a first jumper switch terminal, and a second jumper switch terminal, the first jumper switch terminal being electrically coupled to the second plug terminal of the first plug connector, the second jumper switch terminal being electrically coupled to a second end of the primary winding of the transformer, and the second plug portion including a third jumper switch terminal and a fourth jumper switch terminal, the third jumper switch terminal being electrically coupled to the fourth jumper switch terminal for forming a closed jumper switch when the first plug portion is mated with the second plug portion of the second plug such that, without the need for active circuitry, the closed jumper switch electrically connects the power source to the primary winding of the transformer by a mechanical action of mating the first plug portion to the second plug portion.