| 摘要 |
<p>Provided are an emergency driving apparatus of an inverter for an electric vehicle, which generates new command voltages, to which compensation voltages are added, capable of correcting imbalance in three-phase current caused by voltage imbalance at DC links and compensating the variance of DC links. The emergency driving apparatus of the inverter for the electric vehicle according to the present invention comprises: top and bottom DC voltage links connected in series; a three-phase inverter transforming DC link voltages applied to the top and bottom DC voltage links into three-phase AC voltages; a three-phase motor driven by the three-phase AC voltages output from the three-phase inverter; an emergency connection unit connecting the central point of the top and bottom DC voltage links with each phase input terminal of the three-phase motor; a voltage detection unit detecting the top and bottom DC link voltages; an imbalance correction unit outputting phase voltage deviation correcting commands, in which deviations of phase voltages have been compensated, after receiving outputs of the voltage detection unit, three-phase voltage commands, and DC link voltage references; and a pulse width modulation control unit generating a pulse width modulation control signal using the phase voltage deviation correcting commands.</p> |
