Multiple phase rectifier with active filter for removing noise in triggering signals and digital phase shift compensator for phase shifting signal passed through

摘要

An improved converter for converting a multiple phase variable frequency AC voltage having a high degree of noise produced by a variable frequency multiple phase voltage source into a DC voltage is disclosed. Triggering pulses for a full wave recification bridge are generated by a low pass filter which filters an output signal from the multiple phase variable frequency voltage source which introduces a constant phase shift independent of frequency. A rectangular wave form is produced having a frequency synchronized with zero crossing points of the output signal from the filter. A digital phase shift compensator phase shifts the rectangular wave form to produce a timing signal having a fixed phase shift throughout the variable frequency range which compensates for the phase shift introduced by the filter. Switching pulses for switches in a full wave rectification bridge are produced by processing of the resultant timing signal produced by the digital phase shift compensator to produce operation which is not deleteriously affected by the presence of noise in the output signal from the multiple phase voltage source.