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In a cycloconverter including an intermediate d-c link, a controlled rectifier and a inverter having main thyristors in a bridge circuit with bypass diodes in a bridge connected antiparallel thereto, a quenching circuit including a quenching thyristor and a commutating capacitor is connected paralle

In a cycloconverter including an intermediate d-c link, a controlled rectifier and a inverter having main thyristors in a bridge circuit with bypass diodes in a bridge connected antiparallel thereto, a quenching circuit including a quenching thyristor and a commutating capacitor is connected parallel to each bridge arm, there being provided for each two bridge circuits having a common main lead a common commutating capacitor and at least one common damping capacitor, the latter connected parallel to a bridge arm to reduce the current dependence of the commutation voltage present at the commutating capacitor.

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In a cycloconverter having an intermediate d-c link, a controlled rectifier and an inverter with main thyristors in a bridge circuit, to which bypass diodes in a bridge circuit are connected with opposite polarity with a quenching circuit including a quenching thyristor and a commutating capacitor c

In a cycloconverter having an intermediate d-c link, a controlled rectifier and an inverter with main thyristors in a bridge circuit, to which bypass diodes in a bridge circuit are connected with opposite polarity with a quenching circuit including a quenching thyristor and a commutating capacitor connected in parallel to each bridge arm, one commutating capacitor being provided for each two bridge arms which have a common main terminal lead, and commutating chokes arranged in the commutating circuits, the improvement comprising at least one damping capacitor coupled in parallel to a bridge arm for each two bridge arms with a common terminal lead.