METHOD FOR CONTROLLING RECTIFIER INCORPORATING SHORTING-OUT THYRISTOR (ALTERNATIVES) Russian patent published in 2005 - IPC

FIELD: electrical engineering including converter engineering.

SUBSTANCE: proposed method involves delivery of control pulses to phase thyristors at control angle varying in rectifier mode from zero to maximal rectifier-mode angle and supply of control signal continuously or intermittently to shorting-out thyristor at angle equal to maximal control angle of phase thyristors in rectifier mode; transfer to inverter mode inhibits delivery of control signal to shorting-out thyristor, and control angle is varied in steps at maximal angle in rectifier mode amounting to 90 deg.; then angle of control pulses supplied to phase thyristors is enlarged to desired value. Alternative method involves, in addition, delay of angle by value equal to at least maximal possible one in rectifier mode minus switching angle and time margin for minimum repetition period of phase-thyristor control pulses; then angle of control pulses supplied to phase thyristors is increased to desired value.

EFFECT: enlarged functional capabilities, enhanced reliability.

2 cl, 3 dwg