초록 ▼

An n-phase inverter for developing polyphase AC power from DC power developed by a DC source over first and second DC bus lines and a neutral line includes circuitry for preventing the return of regenerative currents developed by a load connected to the output of the inverter to the DC source. The c

An n-phase inverter for developing polyphase AC power from DC power developed by a DC source over first and second DC bus lines and a neutral line includes circuitry for preventing the return of regenerative currents developed by a load connected to the output of the inverter to the DC source. The circuitry includes means for sensing the presence of regenerative currents, and switches which are operated when a regenerative current is sensed to disconnect the DC source from the inverter and to shunt the regenerative current back to the load. The inverter may therefore be used with DC sources which cannot accept regenerative currents. Furthermore, the size of a DC bus filter between the DC source and the inverter may be substantially reduced.

대표청구항 ▼

In an n-phase inverter for generating polyphase AC power from a DC source having two terminals coupled to the inverter through bus lines, the inverter having rails coupled to the bus lines and outputs connected to a load, the improvement comprising: a first switch connected between one of the bus li

In an n-phase inverter for generating polyphase AC power from a DC source having two terminals coupled to the inverter through bus lines, the inverter having rails coupled to the bus lines and outputs connected to a load, the improvement comprising: a first switch connected between one of the bus lines and one of the rails; a second switch coupled between the one rail and the other bus line; means coupled to the one rail for sensing the direction of current therein, such current being in a particular direction when power developed by the load attempts to return to the DC source; and means coupled to the sensing means and to the first and second switches for operating the switches whereby the first switch is opened and the second switch is closed to shunt current through the second switch from the one rail when the current in the one rail flows in the particular direction to thereby prevent such current from being returned to the DC source.