Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1986-08-08
1987-08-04
Salce, Patrick R.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 47, 363 48, 363126, H02M 742, H02M 112
Patent
active
046850414
ABSTRACT:
A self-oscillating power converter utilizes a MOSFET power transistor switch with its output electrode coupled to a tuned network that operatively limits the voltage waveform across the power switch to periodic unipolar pulses. The transistor switch may be operated at a high radio frequency so that its drain to gate interelectrode capacitance is sufficient to comprise the sole oscillatory sustaining feedback path of the converter. A reactive network which is inductive at the operating frequency couples the gate to source electrodes of the transistor switch and includes a variable capacitance as a means of adjusting the overall reactance, and hence the converter's switching frequency in order to provide voltage regulation. A resonant rectifier includes a tuned circuit to shape the voltage waveform across the rectifying diodes as a time inverse of the power switch waveform. The input resistance of the rectifier is controlled so that it is invariant to frequency change within the switching frequency range of the converter but inversely proportional to the load resistance.
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Bowman Wayne C.
Magalhaes Frank M.
Suiter, Jr. Weyman B.
Ziesse Norman G.
American Telephone and Telegraph Company AT&T Bell Laboratories
Salce Patrick R.
Steinmetz Alfred G.
Todd Voeltz Emanuel
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