A Synchronous Tap Changer Applied to Step-Up Cycloconverters

The operating principles of a transformer tap changing system are presented. The system is named synchronous tap changer because it changes taps in synchronism with its input signal. The purpose of a synchronous tap changer is to change the turns ratio of a transformer in a manner which will reduce the distortion content of the incoming signal. In effect, it is an active filter. It is expected to find use in power type systems.