Magnetic balanced phase shifter for polyphase supply

A novel method of balanced firing of thyristors used for polyphase supply is presented. The phase angles of the polyphase voltages are shifted simultaneously by controlling a phase shifter of a single phase. A simple feedback circuit including a saturable core and an integrator plays a key role in this balanced phase shifter. Phase distortions due to the change of the supply voltage and of the supply frequency can be almost completely removed by this new method.