Application of static inverters in control and instrumentation systems

The p-n junction devices continue to become more inexpensive as time progresses. Coupled with decreased price is increased reliability. Field experience has proved the usefulness of diodes, transistors, and controlled rectifiers in many applications. One important field of application is that of inversion. Static inverters add time dependence to a potential source which is independent of time. The cases to be discussed include the inversion of a direct potential to a time-varying potential having no direct component. Included in these general applications are those combinations of rectifiers and inverters to provide: 1) phase changing, 2) frequency changing, 3) frequency stabilization, 4) voltage stabilizing, 5) standby ac power sources with instantaneous transfer, and 6) direct voltage transformation. Combinations of these are available to provide the system designer with a power supply optimized to yield the best characteristics for minimum cost.