Patent ID: 8259428

Claim:
An inductively powered secondary circuit having protection circuitry comprising: a secondary coil for wirelessly receiving inductive power from an inductive power supply, wherein the inductively powered secondary circuit receives power wirelessly and is physically separable from the inductive power supply; a secondary load in communication with said secondary coil; a thermal cutoff electrically connected between said secondary coil and said secondary load, wherein in response to being heated to a threshold temperature, said thermal cutoff creates an open circuit in said protection circuit; a voltage clamp electrically and thermally coupled to said thermal cutoff and electrically connected between said secondary coil and said secondary load, wherein said voltage clamp is adapted to clamp an input voltage to a desired level in response to an overvoltage condition and dissipate energy to said thermal cutoff in the form of heat; and an electrical fuse electrically connected between said secondary coil and said thermal cutoff, wherein said electrical fuse disconnects said thermal cutoff, said voltage clamp, and said secondary load from said secondary coil in response to a large transient, and wherein said thermal cutoff is capable of creating an open circuit when there is insufficient power to activate said electrical fuse.