发明名称 |
System and method for maintaining performance of battery-operated toothbrushes |
摘要 |
The system periodically measures the battery voltage of the toothbrush and the current in a stator portion of the motor for the appliance. The amplitude of movement of the toothbrush workpiece is determined from the measured stator current. A circuit/control program changes the duty cycle or pulse width of the drive signal from the motor if the battery voltage drops below a first threshold value and a circuit or control program changes the drive frequency of the appliance if the amplitude of the workpiece movement falls below a first threshold value. A circuit/control program terminates the operation of the toothbrush if the voltage drops below a second threshold value or if the amplitude drops below a second threshold value, both of which are less than the respective first thresholds.
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申请公布号 |
US8368327(B2) |
申请公布日期 |
2013.02.05 |
申请号 |
US20070513034 |
申请日期 |
2007.11.02 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V.;BENNING WOLTER F.;LUMBANTOBING ARI;MILLER KEVIN A. |
发明人 |
BENNING WOLTER F.;LUMBANTOBING ARI;MILLER KEVIN A. |
分类号 |
H02P1/00 |
主分类号 |
H02P1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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