Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1980-06-27
1982-05-04
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
331117R, 361156, H01H 4722
Patent
active
043285252
ABSTRACT:
A sine wave oscillating circuit arrangement useful in generating an electromagnetic field, for example, comprises a resonant circuit including an inductor through which the current is tightly controlled and a capacitor connected in parallel, to which dc pulses are applied at a repetition rate equal to the resonant frequency. The current flowing in the inductor is sensed in phase detector and amplitude detectors. The results of these evaluations are applied to cascaded pulse position and pulse width and/or amplitude modulators. A current switching driver circuit driven by pulses from the modulator is connected to the resonant circuits for modifying the dc pulses applied for maintaining the sine wave current in the inductor at the proper amplitude and phase relationship and energy content inversely as the potential across the sampling resistor in the resonant circuit. The energy dissipated in damping the resonant circuit in one cycle of operation is replaced in the next cycle.
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Allen Jay W.
Granata Peter J.
International Business Machines - Corporation
Moose Jr. Harry E.
Roush George E.
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