A Wiegand sensor is provided as a power source for an external circuit, wherein an alternating magnetic field changes the magnetic state of a Wiegand wire within the Wiegand sensor which, in turn, produces a substantial output pulse that is provided as a power source for the external circuit. The external...http://www.google.fr/patents/US6191687?utm_source=gb-gplus-shareBrevet US6191687 - Wiegand effect energy generator
