Patent attributes
An induction circuit for a contactless power supply apparatus including an induction coil for inducing a current in response to a high frequency current flowing through a primary induction circuit and supplying the current to a load. The induction circuit includes a resonant capacitor, a full-wave rectifier, two short-circuited units, a current-limiting coil, and a smoothing capacitor. The current is rectified by the full-wave rectifier via the current-limiting coil to supply the load. The output voltage level and the voltage levels of the short-circuited units are monitored to control the resonance of resonant circuit which is formed by induction coil and resonant capacitor to stop by turning on any of the short-circuited units. Hence, an impulse current is prevented from entering the load and damaging the induction circuit.
