초록 ▼

A vacuum cleaner operates via power supplied from either an on-board battery or an AC power outlet. When the vacuum cleaner is operating by using the battery a controller monitors the voltage level in the battery and automatically shuts down the vacuum cleaner when the battery voltage has decreased

A vacuum cleaner operates via power supplied from either an on-board battery or an AC power outlet. When the vacuum cleaner is operating by using the battery a controller monitors the voltage level in the battery and automatically shuts down the vacuum cleaner when the battery voltage has decreased below a preset level. This prevents a full drainage of the battery and increases its longevity. The controller that monitors the battery voltage level can be used with batteries of different voltages. The controller automatically determines which type of battery is being used and shuts down power to the vacuum cleaner motor after the appropriate amount of battery drainage.

대표청구항 ▼

1. A vacuum cleaner comprising:a motor; an AC supply input; a DC supply input; a switch that selectively couples either the AC or DC input to said motor to thereby deliver power to said motor; and a control adapted for operating said motor from at least two different rated batteries connected with s

1. A vacuum cleaner comprising:a motor; an AC supply input; a DC supply input; a switch that selectively couples either the AC or DC input to said motor to thereby deliver power to said motor; and a control adapted for operating said motor from at least two different rated batteries connected with said DC supply input, said control monitoring the voltage at said DC input when said switch has electrically coupled said DC input to said motor, said control terminating power to the motor when the voltage at said DC input falls beneath a threshold level, said control establishing said threshold as a function of which rated battery is connected to said DC input.