PHASE-SHIFTER Russian patent published in 2006 - IPC H02M1/08 

FIELD: converter engineering; controlling thyristor voltage regulators used, for instance, for stepless start of induction-motor drives.

SUBSTANCE: proposed device has control signal supply labeled PHASE SHIFTER INPUT, voltage-to-frequency converter 1, first 2AND gate 2, binary adding and subtracting counters 3 and 4, respectively, input 5 for connecting pulse supply to set initial conditions in counters 3 and 4, digital comparator 6, second 2AND gate 7, and input 8 for connecting pulse supply to control power thyristors. Proposed device relates to class of systems performing two input signal dependent sweep functions generated in counters 4, 4 under impact of output pulses arriving from pulse voltage-to-frequency converter 1. Thyristor control pulse is generated at moment when numbers in adding and subtracting counters 3 and 4 are equal.

EFFECT: enhanced noise immunity and precision.

1 cl, 5 dwg