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Analog Digital Transistor Switching Regulator Controller

IP.com Disclosure Number: IPCOM000082825D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Calvo, R: AUTHOR [+3]

Abstract

This pulse width modulated switching regulator utilizes digital logic in its feedback control loop to take advantage of the ease with which such logic can be implemented in integrated circuitry, with attendant advantages of decreased size, cost and power dissipation.

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Analog Digital Transistor Switching Regulator Controller

This pulse width modulated switching regulator utilizes digital logic in its feedback control loop to take advantage of the ease with which such logic can be implemented in integrated circuitry, with attendant advantages of decreased size, cost and power dissipation.

The pulse width modulating switch in such a regulator is usually a transistor and, therefore, regulators of this kind are known as TSR's, for "Transistor Switching Regulator". In the illustrated circuit the power switching element, although usually a transistor, is illustrated symbolically by switch SW. Switch SW is operated between full conduction and cutoff to admit pulses of power from source Eb to an LC filter having a free-wheeling diode D.

The resulting regulated DC level at output 10 of the filter is then chopped by a push-pull inverter employing transformer T, having one or more secondary windings 12 connected to load(s) in the usual manner. Transformer T provides DC isolation, as well as the possibility of a number of different loads having different regulated voltages. Typically, the load circuit 14 includes a rectifier and filter to provide the output as a regulated DC.

The feedback loop for control of the regulator employs a secondary 16 of transformer T, full-wave rectified by diodes D1 and D2 and smoothed by filter 18, to extract a DC voltage out of the high-frequency full-wave rectified signal. The output of this filter is the sensing voltage and is fed to a programmable gated differential amplifier (PGDA) which has the following chara...