| 摘要 |
The invention relates to a frequency converter, which is fitted to supply power between a polyphase alternating electricity source and an electric machine. The frequency converter comprises a network rectifier connected to the alternating electricity source and an inverter connected to the electric machine. The power supply is implemented in the network rectifier and in the inverter with solid-state change-over switches, which change-over switches comprise an antiparallel-connected diode fitted in parallel with the controllable switch. The network rectifier and the inverter are connected to each other with an intermediate circuit, which intermediate circuit is implemented without a passive energy storage.
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