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US 4,068,158 AGranted
High efficiency d.c. voltage regulator
AssigneeThe Magnavox Company
InventorsJames E. Hicks, Joseph G. Zahnen, Werner F. Wedam
Life of this patent
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Abstract
A high efficiency switching regulator for maintaining a constant d.c. voltage is described. An efficiency improvement of better than 20 percent is realized by use of an alternate low impedance current source for supplying base current to the control transistor of a switching regulator.
Claims5
An improved switch mode regulator for supplying a regulated voltage from a source of unregulated voltage to an external load impedance of the type having a transformer with a primary and secondary winding, said primary winding being connected in series with said source of unregulated voltage;
- a transistor having a collector, emitter and a base, said collector and emitter being serially connected with said primary winding and said load impedance;
- means for coupling energy induced in said secondary winding to said external load impedance;
- and means for periodically foward biasing the base-emitter junction of said transistor in response to variations of said regulated voltage with respect to a reference voltage, wherein the improvement comprises:
- a. means for storing a portion of the energy supplied by said secondary winding during periods when said transistor is nonconducting;
- and
- b. means for supplying a portion of said stored energy in the form of electrical current to the base of said transistor when said transistor is conducting.
3 more elements
Dependencies are inferred from the claim text.