Automatic baby swing
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United States of America Patent
Stats
-
Jan 1, 2013
Grant Date -
Nov 25, 2010
app pub date -
Apr 23, 2008
filing date -
Apr 23, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The amplitude of a swing powered by an electric motor is controlled by detecting a peak voltage induced in the motor coil by the swing motion when the motor is not being powered and comparing the detected voltage with a one of a set of pre-measured reference values of peak voltages obtained at corresponding amplitude settings to provide a signal to a motor controller which adjusts the power supplied to the motor to bring the swing amplitude to. The motor controller supplies a PWM signal voltage to power the motor and adjusts the voltage on-time to bring or restore the swing to the selected amplitude.
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Family
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