Browse Prior Art Database

Square Wave Modulator

IP.com Disclosure Number: IPCOM000096801D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Volochine, A: AUTHOR

Abstract

In this circuit, diodes D1, D2, D3 and D4 are added to the usual modulator. D1 and D2 limit the excursion of the output voltage. D3 and D4 eliminate transient state oscillations for the rising edge of the voltage at the switching instant.

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Square Wave Modulator

In this circuit, diodes D1, D2, D3 and D4 are added to the usual modulator. D1 and D2 limit the excursion of the output voltage. D3 and D4 eliminate transient state oscillations for the rising edge of the voltage at the switching instant.

The usual modulator is made of inductor L, capacitor C, transformer T and controlled diodes SCR1 and SCR2. These are periodically switched through circuits not shown. DC voltage is applied between terminals A and B.

The voltage across load resistor Rch assumes the shape shown in the drawing. Diodes D1 and D2 prevent the voltage at the primary of the transformer becoming lower than the voltage of negative terminal A.

When SCR1 becomes non conducting and SCR2 conducting, there is a sudden increase of the voltage in E and a sudden decrease of the voltage in F. Diodes D3 and D4 prevent the formation of transient state oscillations across capacitor G and transformer T.

The circuitry can undergo large load variations and starts non loaded or loaded.

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