Abstract
An electronic relay with hysteresis which consists of an integrated comparator (IC comparator) and a positive feedback path, and its application circuit, that is, a pulse ratio modulator are analized. These kinds of circuits have been used in various fields, since they have the simple construction and dissipate very little power, and since the reliability of IC has remarkably been improved.
The operative properties of such circuits, however, were not always obvious owing to the nonlinearities and the complexity of the operating equations. And it was difficult to solve even numerically these equations. In this paper, a large signal DC transferring element and a transfer lag element constitute the model of the IC comparator. The numerical analysis using the model shows the hysteresis characteristics of the electronic relay depending on the variation velocity of the input signal. In the application of GPSS to analize the pulse ratio modulator, the responses to some input signals including not only the simple but the compound oscillations and the transient processes are simulated in the practical CPU time and with a reasonable accuracy. Among other applications, the present methods may be convenient in the analysis and design of switching-type power circuitry.
