METHOD AND DEVICE FOR CONTROLLING THYRISTORS OF THREE-PHASED TRANSFORMER (VARIANTS) Russian patent published in 2007 - IPC H02M1/08 

FIELD: engineering of systems for impulse-phase control of thyristors of three-phased converter, made in accordance to zero and bridge, asymmetric or symmetric, circuits of connection of power thyristors with phase adjustment by magnetic amplifier.

SUBSTANCE: using known method for controlling thyristors of three-phased transformer with phase adjustment by magnetic amplifier and generation of thyristor control impulses by means of relaxation impulse generator on one-transition transistor with RC-circuit by discharging charged capacitor of RC-circuit onto primary winding of impulse transformer, in accordance to invention, phase adjustment by magnetic amplifier is performed by thyristors connected to one of transformer phases, circuits of working windings of magnetic amplifier and impulse generator are powered by rectified trapezoid voltage, synchronized with voltage of the phase, while on appearance of powering voltage impulse, RC-circuits of impulse generator are charged up to voltage of activation of one-transition transistor with time constant, corresponding to maximal angle of transformer adjustment and of RC-circuit set by resistor, and on appearance of control impulse from output of magnetic amplifier, capacitor is charged up to transistor activation voltage through another resistor with time constant corresponding to minimal control angle, and impulses for controlling thyristors connected to next two phases are generated 120 el. after appearance of impulse for controlling thyristors of previous phase.

EFFECT: reduced scattering of characteristics of transformer control systems, limited thyristor control angle range in required spectrum, independently of value of magnetic amplifier adjustment control signal.

3 cl, 2 dwg