Voltage and current relations for controlled rectification with inductive and generative loads

ELECTRONIC RECTIFIERS with controlled point of ignition are now used widely in various industrial-control and power-conversion systems. Although the principle of operation of thyratron and ignitron rectifiers is generally known, the analytical methods for calculation of d-c output voltages of rectifiers have been surprisingly incomplete. For example, the calculation of a d-c output voltage of a polyphase rectifier with no delay of the angle of ignition or with a slight delay only is a conventional matter, since the necessary formulas can be found in standard textbooks. When, however, the point of ignition of a polyphase rectifier is delayed beyond a certain critical value, the conventional formulas for d-c output voltages do not apply any more.