Pat.#5365240:		Efficient driving circuit for large-current radiator
INVENTORS:		Harmuth; Henning F., Potomac, MD
ASSIGNEES:		Geophysical Survey Systems, Inc., North Salem, NH
ISSUED:		Nov. 15, 1994
FILED:		Nov. 4, 1992
ABSTRACT: An improved driving circuit for a large-current radiator avoids the need to dissipate large powers in the driving circuit by drawing a certain energy value from a power supply to a storage capacitor and then feeding this energy to the radiating antenna. A constant current source provides, when a switching circuit coupled to the radiator is opened, a current to counter the tendency of the radiator otherwise to maintain continuity of current through the switching circuit, keeping to a minimum the voltage across the switching circuit so that essentially no energy will need to be dissipated in the driving circuit. By choosing the stored energy value carefully one can make it just large enough to cover the radiated energy but leave essentially no energy to be dissipated in the radiator driving circuit.