| 摘要 |
A charging method using an alternating current (AC) line voltage for conductive charging of an energy storage system (ESS) coupled to a polyphase motor drive circuit communicated to a polyphase motor, the polyphase motor drive circuit including a plurality M of driver stages, one driver stage for each phase of the polyphase motor with each driver stage coupled across the energy storage system, the method including the steps of: (a) coupling a first connector providing the line voltage to a second connector coupled to the plurality of driver stages; (b) interrupting selectably the line voltage from communication with the plurality of driver stages; (c) measuring both an ESS common mode voltage of the energy storage system with respect to a voltage reference and a line common mode voltage of the line voltage with respect to the voltage reference while the line voltage communication to the plurality of driver stages is interrupted; (d) operating a particular one of the driver stages to power a common mode voltage driver to align the ESS common mode voltage with the line common mode voltage while the line voltage communication to the plurality of driver stages is interrupted; and thereafter (e) suspending the interrupting step (b) when a difference between aid ESS common mode voltage and the line common mode voltage is less than a first predetermined value, the suspending step (e) communicating the line voltage to the plurality of driver stages; and thereafter (f) converting the line voltage to a charging voltage communicated to the energy storage system using a set of the plurality of driver stages not including the particular one driver stage. |
