Patent ID: 7109602

Claim:
A contactless power supply system for feeding electric power from a primary-side induction line providing high frequency current to a secondary-side travel carriage in a contactless manner, characterized in that the primary-side induction line comprises: a first induction line connected to a power supply device and feeding electric power to the travel carriage in a contactless manner; at least one second induction line for feeding electric power to the travel carriage in a contactless manner; and a magnetic body for inductively coupling the first induction line and the second induction line, the contactless power supply system including: an added line wound on the magnetic body; a switch means for short-circuiting the added line; and a start circuit connected together with the switch means in parallel to the added line, and adapted to raise a loaded current flowing through the second induction line with a predetermined time constant when the switch means is opened, thereby to prevent the magnetic body from becoming saturated due to difference between the current flowing through the primary-side induction line and the loaded current.