Transistors and Junction Diodes in Telephone Power Plants

Recent articles in the literature have treated the theory and properties of semiconductor devices. In particular, papers by Messrs. Shockley, Ryder, Wallace and others have emphasized the theoretical aspects of the new devices; their reliability, reproducibility and performance at high frequencies to name only a few. 1,4 - 5- 6 - 7 In addition many papers have been published concerning their applications in the transmission and computer fields. There is also a field of application for these devices in the conversion and control of power, and this paper discusses some of these power applications. 1.1. Scope The first three groups of sections in this discussion review the pertinent characteristics and practical engineering aspects of junction rectifier diodes (Section 2.1), reference voltage diodes (Section 2.2) and junction transistors (Section 2.3). The second three groups of sections concern respectively shunt transistor regulators (Section 3.1), series transistor regulators, (Section 3.2) and power regulating circuits employing magnetic amplifiers in combination with transistors and junction diodes (Section 3.3). The last two groups of sections treat specific applications (Sections 4.1 through 4.3). 827