Self-commutated semiconductor static inverter - has reduced reset magnetising voltages and energy retrieval from capacitors coupled to diode bridge

摘要

The self-commutated semiconductor static inverter has the dc terminals of the additional rectifier diodes (9-12) connected over a pair of capacitors (13, 14) to the dc supply (21). Discharge resistors (15, 16) are connected in parallel with the capacitors. The diode bridge is coupled to a tapped transformer forming the diagonal of the inverting thyristor bridge. The advantage of the capacitors lies in their reducing the reset magnetising voltages on the commutating chokes (17, 18) in the thyristor bridge and in retrieving some otherwise lost energy.