Controllable inductance optionally used in non-contacting, medium power transmission system, includes main winding and control windings on core with air gap

摘要

The inductance has a main winding supplied with alternating current around one limb of a core. In novel design, a control winding on at least one limb of the core is supplied with direct current. The control winding is formed by two partial windings. The winding directions are such that the local flux produced by the first partial control winding, agrees in direction with that produced in the same region, by a positive current in the main winding. In addition the flux produced locally by the second partial control winding, corresponds in direction with the flux produced locally by negative current in the main winding. The control winding is wound in alternating fashion, so that 1-10 windings are made in a first region, then another 1-10 windings are laid-on in a second region. A supply winding is wound on at least one limb of the core. This is connected to a device producing direct current. The device employs an induced voltage, especially a secondary voltage, which is sent to the supply winding. The device producing direct current is a controlled DC/DC converter, power switch and/or controlled resistance. The core includes an air gap penetrated by the flux produced by the main winding. The flux produced by the partial control windings is passed through regions of the core without an air gap. The control signals are transmitted without contact and/or with galvanic isolation. A control circuit is provided. In an arrangement for non-contacting power transmission (also claimed), a medium frequency current is fed into an extended primary conductor system. Consumers are supplied using a secondary coil inductively coupled with the primary conductor system. The secondary coil has a capacitance connected in series or parallel. The resonant frequency is the medium frequency cited, which lies especially in the range 10-500 kHz. The novel feature is use of the controlled inductance as the secondary coil. The inductance is included in a gyrator arrangement. Further details of this system are included, in accordance with the foregoing principles.