Browse Prior Art Database

FEEDBACK SIGNAL ISOLATION NETWORK

IP.com Disclosure Number: IPCOM000005815D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-08
Document File: 1 page(s) / 38K

Publishing Venue

Motorola

Related People

Ron Easter: AUTHOR

Abstract

The purpose of this circuit is to provide an isolated path for the feed-back signal in the regulator for a switching power supply. The regulator is often located on the primary side and it is necessary to sense the output without com- promising input/output dialectric isolation.

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MOmROLA Technical Developments Volume 10 March 1990

FEEDBACK SIGNAL ISOLATION NETWORK

by Ron Easter

   The purpose of this circuit is to provide an isolated path for the feed-back signal in the regulator for a switching power supply. The regulator is often located on the primary side and it is necessary to sense the output without com- promising input/output dialectric isolation.

   The power supply output voltage, Vo is impressed upon pulse transformer Xl through transistor Q3. Transistor 63 is driven from the primary side by pulse transformer X2 and transistor CU. Source A represents one of the main outputs of a PWM circuit. The output voltage is thus effectively sampled by capacitor Cl1 through pulse transformer Xl.

D5 lN914

.3-v 0

a

Dl 1,

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if:! uf

I

Y-

0 Motorola, Inc. 1990 3

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