| 摘要 |
PROBLEM TO BE SOLVED: To provide a cordless vacuum cleaner in which an inexpensive universal motor can be driven by a battery, a brush is suppressed in deterioration, and a problem of a life does not occur.SOLUTION: A cordless vacuum cleaner comprises: a suction universal motor; a battery for driving the universal motor; a DC-DC converter which boosts an output of the battery by switching, and supplies the output to the universal motor; and a boost control part which controls the switching. The boost control part changes a duty ratio to a sine wave shape or a full-wave rectification wave shape, and controls the switching so as to be performed. |
