Power supply device for plasma processing

A power supply device for plasma processing, wherein electric arcs may occur, comprising

• a power supply circuit for generating a voltage across output terminals,
• said output terminals being for connection to a plasma processing chamber by means of conductors,
• an interrupting switch connected between said power supply circuit and one of said output terminals for interrupting the power supply to said plasma processing chamber in case of the occurrence of an arc, and
• a recovery energy circuit connected to said output terminals and to said power supply circuit, said recovery energy circuit serving for feeding at least partially the energy which is stored in said conductors when said interrupting switch is actuated to interrupt the power supply to said plasma processing chamber back to said power supply circuit,
• wherein said power supply circuit is configured to reuse the energy fed back at least partially for the power supplied to said plasma processing chamber, and
• wherein said power supply circuit comprises a transformer having a primary side and a second side, the connection of said recovery energy circuit to said power supply circuit being arranged at said primary side of said transformer and the connection of said recovery energy circuit to said output terminals being arranged at said secondary side of said transformer.