Patent ID: 6188179
Filing Date: 2001-02-13
Classification: C02F,H05B

Abstract:
A circuit for collecting inductively transferred electric power and supplying the power to a load having a negative resistance, the circuit comprising:(a) at least one first inductor having a core oriented so that it is capable of intercepting, in a loosely coupled fashion, the magnetic flux radiating from a powered primary conductor, thereby causing a voltage to be induced in the windings of the at least one first inductor,(b) at least one second inductor in series with the at least one first inductor, the second inductor having a core substantially incapable of intercepting the magnetic flux radiating from the primary conductor,(c) at least one capacitor connected in parallel across at least one of the series of inductors, thereby forming in combination with the series of inductors a circuit capable of resonance at or about a supply frequency,(d) an output from across the at least one capacitor,(e) the second inductor being saturated by the current therethrough at a predetermined value of said current and thereby detuning the resonant circuit, so that in use the circuit providesi) when not under load, an alternating output at a high voltage--and thenii) when under load, a source of the constant-current type, supplying a current substantially proportional to the magnetic flux about the primary conductor yet substantially independent of the resistance of the load, and having an upper current level limited by the second inductor.