Drive circuit for a hair clipper

Details Drive circuit for a hair clipper Drive circuit for a hair clipper

2006-03-16

2008-11-04

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Armature circuit control

Voltage control

C318S494000, C030S045000, C030S210000

Reexamination Certificate

active

07446495

ABSTRACT:
A drive circuit for a hair clipper comprises an electric motor and a control circuit for operating the motor at a constant speed regardless of load conditions. The control circuit has detector means for sensing the supply voltage to the clipper and the clipper current, processor means for generating an error signal indicative of a change in supply voltage needed to maintain a constant motor speed and driver means responsive to the error signal for adjusting the supply voltage to the motor to maintain the speed constant.

REFERENCES:
patent: 3872587 (1975-03-01), Wellinger
patent: 4514667 (1985-04-01), Sakmann et al.
patent: 5632087 (1997-05-01), Motohashi et al.
patent: 6441517 (2002-08-01), Brum et al.
patent: 7193377 (2007-03-01), Fung
patent: 1059612 (1967-02-01), None
patent: 1110584 (1968-04-01), None
patent: 1 338 644 (1973-11-01), None

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