| 摘要 |
<p>A charging system for a battery powered electric vehicle has means (2, 3, 4, 6, 13, 7) for passing electric power to or from its battery in either direction, to or from a utility/mains (100), whereby load-levelling on the mains can be effected. Control of the procedure can be effected by the utility through a suitable communications link. A traction drive system for an electrically driven vehicle having this type of charging system includes an AC traction motor (5) and a pulse width modulated converter (2) controllable to convert a DC electrical signal from a battery (1) into an AC drive signal for the motor (5). A switch means (4) is connected to a port of the converter, for switching the second port between the traction motor and an AC input port, so that the mains supply can be used to charge the battery (1).</p> |
