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US 3,946,302 AGranted
Power regulator with R.M.S. output voltage as function of unregulated D.C.
AssigneeHewlett-Packard Company
InventorsAlbert W. Kovalick, Kenneth D. Scholz
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Abstract
Utilizing the method and circuit described herein regulated power is provided by controlling the duty cycle of p. fixed frequency signal as a function of the amplitude of unregulated D.C. voltage applied. A thin film thermal printer utilizing this power regulator is also described herein.
Claims6
A power regulator energized by unregulated D.C. voltage comprising:
- an oscillator for producing a first signal having a first duty cycle;
- charge storing means coupled to the oscillator for producing a second signal having a second duty cycle in response to the first duty cycle of the first signal and the magnitude of the unregulated D.C. voltage;
- and
- comparator means coupled to the charge storing means for comparing the magnitude of the second signal with a reference signal and for producing an output signal having a substantially constant RMS value as a function of the duty cycle of the second signal and the magnitude of the unregulated D.C. voltage when the magnitude of the second signal exceeds the reference signal.
1 more element
Dependencies are inferred from the claim text.