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Dual Control Regulator

IP.com Disclosure Number: IPCOM000088263D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hoffman, HS: AUTHOR

Abstract

This regulator utilizes two energy transfer devices under the control of a single switch to power two output circuits independently. One transfer device saturates during the switching cycle and, therefore, its energy transfer is a function of the number of cycles per unit of time. The other device is volt-time sensitive and, therefore, its energy transfer is a function of on-time per unit of time.

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Dual Control Regulator

This regulator utilizes two energy transfer devices under the control of a single switch to power two output circuits independently. One transfer device saturates during the switching cycle and, therefore, its energy transfer is a function of the number of cycles per unit of time. The other device is volt-time sensitive and, therefore, its energy transfer is a function of on-time per unit of time.

In the illustrated circuit, the saturating flyback transformer 10 is saturated on each cycle of switch S1 operation, thereby having a constant energy delivery per cycle. On the other hand, the amount of energy stored per cycle in the nonsaturating flyback transformer 12 is variable and depends on the length of the "on" time of S1. Therefore, the ratio of energy transferred to secondary circuits 14, 16 is determined by S1 "on" time. The power is energy per unit time in both cases and is therefore a function of the length of the cycle.

For a given "on" time, frequency controls the total power output, the "on" time controlling the ratio of the two output powers. This means that control of "on" and "off" times of the single switch S1 can provide independent control for two outputs.

To achieve this operation, feedback 18 controls the period T of S1 cycling, thereby fixing flyback voltage V1. Feedback 20 controls the portion of T that S1 is "on" (or closed), thereby determing V2. The energies delivered from L1 and L2 to the cores of 10, 12 vary in time,...