Electronic switching device for demagnetizing ferromagnetic material

An electronic circuit for demagnetizing ferromagnetic material using a resonance oscillation having a prolonged decay time, the electronic circuit comprising

• a voltage source and a conductor loop connected thereto,
• a demagnetizing resonant circuit in the conductor loop, for forming a decaying, alternating magnetic field in which ferromagnetic material can be demagnetized during a decay time,
• a resonant circuit charging switch in the conductor loop, in series with the demagnetizing resonant circuit,
• a recharging resonant circuit in the conductor loop, arranged in parallel with the demagnetizing resonant circuit and with the resonant circuit charging switch, for pulsed recharging of a charging current into the demagnetizing resonant circuit with the resonant circuit charging switch closed in each case,
• a recharging store, which is arranged in parallel with the voltage source, with the recharging resonant circuit and with the demagnetizing resonant circuit, for supplying power to the recharging resonant circuit during the decay time,
• a recharging switch in the conductor loop for interrupting a charging current from the voltage source and from the recharging store to the recharging resonant circuit and to the demagnetizing resonant circuit,
• a charging switch for interrupting the charge source to the recharging store, to the recharging resonant circuit and to the demagnetizing resonant circuit,
• wherein the voltage source and all switches can be controlled by a controller, and wherein in operation, by opening and closing the switches recharging pulses from the recharging resonant circuit can be introduced into the demagnetizing resonant circuit, for prolonging the decay time until the energy from the recharging store is exhausted.