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Closed Loop Controlled Ferroresonant Regulator

IP.com Disclosure Number: IPCOM000082866D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Higuchi, HA: AUTHOR [+2]

Abstract

This ferroresonant regulator provides a means of obtaining a regulated DC output voltage, which is isolated from the input AC voltage.

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Closed Loop Controlled Ferroresonant Regulator

This ferroresonant regulator provides a means of obtaining a regulated DC output voltage, which is isolated from the input AC voltage.

Inductor :LO and capacitor CO form a filter combination which performs a primary filter operation on the input signal VAC. The output of this filter is fed into primary windings NP1 and NP2 of the ferroresonant transformer T. The secondary windings NS1 and NS2 of the ferroresonant transformer T are connected with diodes D1 and D2 to form a rectifier. The output of this rectifier is a DC voltage which is further filtered by capacitor C1. This output filter C1 provides line regulation.

Zener diode Z is connected to one input of amplifier A and establishes a reference voltage. The second input of amplifier A is the output of the regulator. The output of amplifier A is an error voltage which controls a current source formed by transistors T1 and R, to control the current flow through winding NC on the ferroresonant regulator T. The field established in the ferroresonant regulator controls the saturation point of the ferroresonant regulator, and thereby allows load regulation of the output voltage of the regulator.

The center leg of the ferroresonant transformer T provides the magnetic flux path for the DC flux established by the feedback winding NC and the feedback control current IC. The center leg gap in transformer T imposes a high- reluctance path for the AC flux changes, due to the o...