Vacuum cleaner

Details Vacuum cleaner Vacuum cleaner

A - Human Necessities

47

L

15/61

A47L 9/19 (2006.01) A47L 9/28 (2006.01)

Patent

CA 2016516

A vacuum cleaner comprises: a blower motor; a dust detector responsive to a dust particle sucked due to rotation of the blower motor for producing a dust detecting signal when detecting each of dust particles passing a portion in a sucking passage of the dust; counter responsive to the dust detection signal for counting the number of the dust particles for a given interval; and input power controller responsive to an output signal of the counter for controlling input power of the blower motor by selecting an input power value from plural preset input power values in accordance with the number. Controlling input power may be performed in accordance with pulse width indicative of dust particle size or the counted number may be modified by pulse width. Another vacuum cleaner further comprises plural light emitting diodes for indicating the number counted to show an operator uncleanness of the floor. The controller comprises a microprocessor which can control a thyristor provided in series with the blower motor directly. However, in a vacuum cleaner where the thyristor locates in the housing, on the other hand, the microprocessor locates in a handle portion, a D/A converter and a phase control circuit may be provided in the housing.

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