Electrical transmission or interconnection systems – Plural load circuit systems
Patent
1999-07-16
2000-05-02
Riley, Shawn
Electrical transmission or interconnection systems
Plural load circuit systems
307 33, 363131, 363 16, 323274, H02J 100
Patent
active
060576073
ABSTRACT:
A step-down switched-mode power supply circuit includes a transformer having at least one primary winding and at least one secondary winding, a current sensing device for sensing a current through a primary winding of the transformer, a first switch and a second switch, a first comparator for determining if the current through the current sensing device exceeds a threshold, a voltage regulator coupled to the secondary winding to produce a regulated voltage, a second comparator for determining if the regulated voltage has drooped below an acceptable level, a counter coupled to the second comparator for generating a signal having a fixed number of switch cycles, and control circuitry for generating signals controlling the first switch and the second switch and responsive to the first comparator to enter a power saving mode disabling the signals, and to the second comparator to temporarily exit the power saving mode for a fixed number of cycles when the regulated voltage has drooped below an acceptable level.
REFERENCES:
patent: 5532577 (1996-07-01), Doluca
patent: 5677619 (1997-10-01), Doluca
patent: 5705919 (1998-01-01), Wilcox
Fogg John
Rader, III William Edward
Riley Shawn
Semtech Corporation
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