The power chopper with forced extinguish and command realized with FPGA

Abstract

Abstract This paper presents the operation of a chopper power with forced extinguish of reactive RC circuit whose control is obtained from a FPGA board (Nexis4DDR) for the adjustment of the frequency of the control software of the thyristors. Control signals for the two thyristors are obtained by dividing the clock frequency of the FPGA board which controls a 2-bit counter circuit made with flip-flops. The output of the FPGA board is connected to a current amplifying circuit realized with bipolar transistors in Darlington connection and a circuit for the galvanic separation with the pulse transformers and power supplies for opening the thyristor. The maximum frequency command value is limited by the recovery time of the main thyristor.