Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2003-01-15
2004-10-12
Riley, Shawn (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S049000, C363S020000
Reexamination Certificate
active
06804126
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a power supply start up circuit and more particularly to a power supply start up circuit designed to inhibit power losses by dissipation therefrom.
BACKGROUND OF THE INVENTION
Switching power supplies of various topologies are used to provide a regulated output voltage (Vreg) from an unregulated or regulated input voltage (Vin).
As discussed in greater detail below, prior art switching power supplies suffer from prolonged or erratic start-up times as a result of the time constraints in standard prior art resistor capacitor startup circuits.
Also, prior art switching power supplies are prone to continuous power dissipation in the bleeder resistor of the standard resistor capacitor startup circuit during normal operation.
Furthermore, prior art switching power supplies suffer from excessive heating of circuit components during overload or short circuit conditions where such heating is as a result of the output being cycled on and off at a rate determined principally by the time constraints in the standard resistor capacitor startup circuit.
REFERENCES:
patent: 4246634 (1981-01-01), Purol
patent: 4370701 (1983-01-01), Western
patent: 4866590 (1989-09-01), Odaka et al.
patent: 5459652 (1995-10-01), Faulk
patent: 5953219 (1999-09-01), Matsumoto
patent: 0 262 581 (1988-04-01), None
patent: 1 566 940 (1977-06-01), None
patent: 1 602 920 (1978-05-01), None
patent: WO 89/03136 (1989-04-01), None
Keating & Bennett LLP
Mitel Knowledge Corporation
Riley Shawn
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