ELECTRONIC DEVICE WITH A DUTY CYCLE ESTIMATOR
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United States of America Patent
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Issued Date -
Oct 9, 2014
app pub date -
Jul 2, 2013
filing date -
Apr 3, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A circuit in an electronic device coupled to a battery via a first pair of switches includes a logic unit and a filter. The logic unit receives a pulse width modulation (PWM) signal and a first signal, and generates a second signal according to the PWM signal and the first signal. The filter is coupled to the logic unit and converts the PWM signal into a first voltage under the control of the second signal. When the first voltage is at a voltage of the battery and a duty cycle of the PWM signal is at a specified value, the first pair of switches controls power to the battery under control of the PWM signal and the circuit is disabled by the first signal.
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