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US 5,691,629 AGranted
Non-volatile power supply having energy efficient DC/DC voltage converters with a small storage capacitor
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorKevin Belnap
Life of this patent
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Abstract
A step-up DC/DC voltage convertor is coupled to a step-down DC/DC voltage convertor via a capacitor, which stores energy and maintains power flow to an output load circuit during a brief interruption of power supplied to the input of the step-up convertor. A diode connected to the capacitor prevents energy stored within the capacitor to be fed back to the step-up voltage convertor during the power interruption.
Claims2
Apparatus for supplying electrical power to a load circuit for a brief time after power is lost comprising:
- (a) a step-up DC to DC voltage convertor;
- (b) a step-down DC to DC voltage converter having an output circuit to be coupled to said load circuit;
- (c) coupling circuit means for coupling an output circuit of said step-up voltage convertor to an input circuit of said step-down voltage convertor, said coupling means including an energy storage capacitor coupled across the input circuit of said step-down voltage convertor together with a unidirectional impedance means for preventing energy stored within said capacitor to be fed back to said step-up voltage convertor;
- and
- (d) means for causing said step-down convertor to operate as a step-up convertor when the voltage across said energy storage capacitor becomes less than the voltage across said output load circuit.
2 more elements
Dependencies are inferred from the claim text.