| 摘要 |
A self-controlled inverter with constrained commutation comprises between its main positive and negative buses a series connection of two controlable main valves, such as thyristors, with an appertaining quenching network. A commutating reactor interconnects the two main valves in series with each other and has a midtap to which the load to be energized is attached. The quenching network has a quenching capacitor common to the two main valves and is connected, independently of the main valves, between a direct-voltage supply whose terminal polarity is selectable with respect to the electrodes of the quenching capacitor. The direct-voltage supply may either be constituted by the main buses of the inverter itself, or they may consist of a separate voltage source. In either case an after-charging network is preferably provided for replenishing the charge of the commutating reactor, the after-charging network having an inductance means connected between the quenching capacitor and the buses or other voltage supply.
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