Patent ID: 7843707

Claim:
A non-contact power supply, comprising: a detachable transformer comprising: a primary side; and a secondary side; a current sensor coupled to the primary side and sensing a primary side current; a controller generating a switching signal, coupled to the current sensor and comprising a built-in program for manipulating the power supply and initializing the power supply at a detecting mode; a first rectifying apparatus coupled to an external AC power source in parallel and outputting a first DC voltage; a switch module coupled to the first rectifying apparatus, the primary side and the controller, receiving the first DC voltage and the switching signal and outputting a first AC voltage to the primary side; and a second rectifying apparatus coupled to the secondary side, receiving a second AC voltage and generating a second DC voltage, wherein the transformer is under a coupling status when the current is smaller than a first current value, and then the controller makes the power supply switch to a power transmission mode; the transformer is under a separate status when the current is larger than a second current value, and then the controller makes the power supply switch to the detecting mode; the switch module works under a first switching frequency to generate a high level of the first AC voltage, and the switch module works under a second switching frequency to generate a low level of the first AC voltage.