Logic and drive circuits or inverter applications are discussed and compared on the basis of performance, reliability, and number of components. Two ring counter circuits are analyzed and modifications to improve their reliability are suggested. Two drive circuits are analysed and compared.nA pulse-width modulated SCR power stage and a modified version of the circuit are analyzed. Equations for the circuit component voltages and currents are developed.nThe choice of transistors or SCR for the switching elements in inverters is discussed in terms of circuit complexity and drive power. Circuit complexity is considered from the standpoint of reliability. Reliability figures for available transistors and SCR8 were computed and plotted against the ratio of drive power to switched power. On the basis of these computations it is concluded that if either temperature or operating frequency is increased, the failure rate for SCR inverters increases rapidly.nA switched type regulator is analyzed and design equations are given for computing component values for optimum operation.nStatic inverter circuit-configurations which use square wave additive techniques are discussed and general harmonic analysis theory is applied to several specific cases to establish filtering requirements.nA method is developed for using z-transform theory in the stability analysis of certain switch-type feedback systems. The use of the z-trans-form method makes it possible to find all the limit cycles and their stability for systems containing either a perfect switch, a switch with hysteresis, or a switch with dead zone. The analysis is exact for systems of all orders.
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