Controlled ferroresonant voltage regulator providing immunity from sustained oscillations
AssigneeMotorola, Inc.
InventorsJames F. Long, Brian J. Budnik
Life of this patent
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Abstract
The invention is a controlled ferroresonant power supply with an improved feedback circuit resulting in improved output stability. The feedback circuit is responsive to the low voltage secondary output of the power supply to provide a variable output signal to activate the switch which controls the resonant winding circuit. The improved feedback circuit is responsive to the rectified AC low voltage secondary output for only a portion of its frequency period.
Claims5
A ferroresonant power supply operating from AC input signal to provide a regulated output, said power supply comprising:
- a secondary including a transformer core for receiving said AC input signal by transformer action and for developing an output,
- switching means,
- a feedback circuit including a clock and an output means, said clock being enabled to respond to said secondary output for only a portion of the frequency period proximate the expected zero-crossings of said AC signal and otherwise disabled and said output means being responsive to said clock for providing a variable output signal to activate said switching means, and
- resonant winding means which changes the magnetic characteristics of said transformer core in response to said switching means.
A ferroresonant power supply operating from an AC input signal to provide a regulated output, said power supply comprising:
- a secondary including a transformer core for receiving said AC input signal by transformer action,
- switching means,
- a feedback circuit enabled to respond to said secondary output for only a portion of the frequency period of said AC signal and providing a variable output signal to activate said switching means, said feedback circuit including
- a clock responsive to said secondary output and having an inhibit input,
- a timing circuit responsive to said clock,
- an inhibit circuit responsive to said timing circuit to disable and enable said inhibit input of said clock,
- output means responsive to said timing circuit to provide a variable signal output to said switching means, and
- resonant winding means which changes the magnetic characteristics of said transformer core in response to said switching means.
Dependencies are inferred from the claim text.