TO DIGITAL FIRING PULSE GENERATOR WITH PULSE SUPPRESSION

摘要

A digital firing pulse generator for thyristor rectifiers in a power converter system uses a time dependent waveform to trigger a one-shot multivibrator for generating a hard pulse of minimum duration and includes a free running oscillator generating a train of picket fence pulses applied to the thyristor rectifier after the hard pulse in order to insure extended conduction. A pulse suppressor actuated upon an emergency prevents the initiation of a hard pulse but does not shorten the duration of any initiated hard pulse, and suppresses the picket fence pulses. Provision for end stops on the picket fence pulses exist and the generation of a separate hard pulse is digitally controlled when a hard pulse is missing after the selection of a rectifier next to be fired.