| 摘要 |
A portable vacuum cleaner is disclosed. The portable vacuum cleaner includes a rechargeable battery having a nominal battery voltage output at a first voltage level and a DC motor operable at a voltage level substantially equal to the first voltage level. The portable vacuum cleaner further includes a DC power input port for receiving DC power. The DC power input port is adapted to electrically couple the vacuum cleaner alternatively to a first a source of DC power at a first voltage output level substantially equal to the first voltage level and a second source of DC power at a second voltage output level, the second voltage level substantially greater than the first voltage level. The vacuum cleaner still further includes a switching device, such as a two position power switch and a two position car/battery charge switch. The switch may have four output states switchable to selectively cause four operational states. The operational states comprise a first operational state wherein the motor will operate as powered by the battery, a second operational state wherein the motor will not operate, and the battery will not charge if coupled to the first source of DC power and the battery will charge if coupled to the second source of DC power, a third operational state wherein the motor will operate if coupled to the first source of DC power but will not operate if coupled to the second source of DC power and a fourth operational state wherein the motor will not operate and the battery will not recharge. |
