CPC A61C 17/34 (2013.01) [A61C 17/221 (2013.01); A61C 17/225 (2013.01); H03K 17/98 (2013.01)] | 9 Claims |
1. A personal care appliance comprising:
an electric motor having a drive shaft, the electric motor configured to, in response to a voltage signal, oscillate the drive shaft in an oscillatory motion having an oscillation amplitude; and
a control circuit comprising, in operable cooperation, a user interface, a processor, a pulse width modulation signal generator, and a power source, the control circuit operably coupled to the electric motor and configured to supply the voltage signal to the electric motor, the voltage signal having a frequency and a duty cycle, the control circuit configured to vary the frequency and the duty cycle of the voltage signal in response to an oscillation adjustment input received from the user interface so that the oscillation amplitude of the drive shaft is varied along a substantially linear rate of change profile relative to the frequency.
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