Method to prevent saturation of an inductor coil and inductor coil circuits for realising such a method

摘要

A method to avoid saturation of the magnetic core (M) of an inductor coil (L) includes the steps of providing a bypass circuit (BP) across said inductor coil (L) for bypassing a DC current to said coil. Such a bypass circuit includes a regulating circuit (RE) to control the amount of DC current which is bypassed, and may further include an active gyrator (G) for the bypass of the DC current. This invention is applicable to one single coil (L) or to any circuit including a series connection of coils. In the latter case one or more bypass circuits may be provided across either one or more series connected coils.