Browse Prior Art Database

Two Core High Frequency Ferroresonant Regulator

IP.com Disclosure Number: IPCOM000074464D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Nunnery, WB: AUTHOR

Abstract

In the design of low power, lightweight power supplies for portable devices, a well regulated supply has been developed using a high frequency, around 10 KHz, ferroresonant transformer driven through a set of switching transistors. A feedback control over the switching frequency together with the off frequency resonant characteristics of the transformer enable regulation of the output voltage.

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Two Core High Frequency Ferroresonant Regulator

In the design of low power, lightweight power supplies for portable devices, a well regulated supply has been developed using a high frequency, around 10 KHz, ferroresonant transformer driven through a set of switching transistors. A feedback control over the switching frequency together with the off frequency resonant characteristics of the transformer enable regulation of the output voltage.

In the power supply diagrammed, only two cores are used to transmit the power currents to the load circuit and due to the frequencies involved, the cores may be of small size and weight. In the supply, an input circuit 1 provides a high voltage unregulated DC supply. The positive lead goes to the center tap of a primary 2 of a Ferroresonant transformer 3. A capacitor 4 across the primary 2 provides the resonant circuit and each end of the primary 2 is connected through a choke winding 5 to the collector of a switching transistor 6 which has its emitter connected to the negative lead of supply 1. Both windings 5 are on the same torroidal core 7 and when energized act to magnetize the core in opposite directions. The core 7 is of sufficient area so that it does not saturate on the highest designed current pulse and is of low retentivity material. In transformer 3, the core 8 is of a square hysteresis loop material and does saturate to provide the ferroresonant function.

The secondary winding 9 of transformer 3 is connected to a...