Abstract: A method and an arrangement are provided for controlling phase-specific thyristors of a half-controlled network bridge. The method includes identifying continuously a thyristor to be controlled on the basis of magnitudes of supplying phase voltages, controlling the thyristor by enabling a current flow to its gate current circuit through an inductive component of a constant current regulator, which is common to all the gate current circuits. The thyristor control includes determining a magnitude of the gate current at the potential of the gate conductor in the constant current regulator, alternately switching off the voltage producing the gate current from the gate current circuit when the gate current is higher than a first predetermined limit, and switching on the voltage producing the gate current in the gate current circuit when the gate current is lower than a second predetermined limit.

Abstract: A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge. The method comprises the steps of identifying continuously a thyristor to be controlled on the basis of magnitudes of supplying phase voltages; controlling the thyristor by enabling a current flow to its gate current circuit through an inductive component of a constant current regulator, which constant current regulator is common to all the gate current circuits, the thyristor control comprising the steps of determining a magnitude of the gate current at the potential of the gate conductor in the constant current regulator, alternately switching the voltage producing the gate current off from the gate current circuit when the gate current is higher than a predetermined limit, and switching the voltage producing the gate current on in the gate current circuit when the gate current is lower than a predetermined limit.

Abstract: A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge, the method comprising identifying a thyristor to be controlled on the basis of the magnitude of phase voltage, controlling the thyristor by switching on a voltage in its gate current circuit to achieve a gate current. The controlling of the thyristor comprises the steps of leading the gate current through an inductive component of the gate current circuit to the gate of the thyristor, determining the magnitude of the gate current, alternately switching off the voltage in the gate current circuit, when the gate current is higher than a preset limit, and switching on the voltage in the gate current circuit, when the gate current is lower than a preset limit.

Abstract: A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge, the method comprising identifying a thyristor to be controlled on the basis of the magnitude of phase voltage, controlling the thyristor by switching on a voltage in its gate current circuit to achieve a gate current. The controlling of the thyristor comprises the steps of leading the gate current through an inductive component of the gate current circuit to the gate of the thyristor, determining the magnitude of the gate current, alternately switching off the voltage in the gate current circuit, when the gate current is higher than a preset limit, and switching on the voltage in the gate current circuit, when the gate current is lower than a preset limit.