Date of Award

11-1971

Degree Type

Master's Essay - Restricted

Degree Name

Master of Science (MS)

Department

Electrical and Computer Engineering

First Advisor

Ronald S. Hosek

Abstract

A two wire on delay timer used a circuit shown on page 10. The SCR used as the output switching element was kept on during line current reversal by a capacitor from the gate of the SCR to cathode. It was desired to analyze the gate "hold on" circuit to be able to optimize that part of the circuit and learn the parameters necessary to make the circuit work. A simplified circuit showing only the part of the timer to be analyzed is shown on page 11. It should be noted the circuit has been successfully used in a production timer, but the circuit has not been rigorously analyzed and optimized. (Patent has been applied for the circuit by Cutler-Hammer, Inc.)

This paper investigates the SCR characteristics needed for this circuit analysis and develops an accurate ECAP model of the simplified circuit, page 38. The ECAP (Electronic Circuit Analysis Program) program was developed with the aid of IBM manuals. The ECAP model is used to simplify the real circuit.

Comments

An essay submitted to the Faculty of the Graduate School, Marquette University, in partial fulfillment of the requirements for the Degree of Master of Science. Milwaukee, Wisconsin

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