Doorbell device
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United States of America Patent
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Apr 25, 2017
Issued Date -
N/A
app pub date -
May 18, 2015
filing date -
May 23, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A doorbell device is provided. The doorbell device includes a user interface, a control circuit, a power switching circuit, a first capacitor, a second capacitor, and a charge/discharge control circuit. The user interface includes a button. The control circuit is coupled to the user interface and generates a power control signal according to a state of the button. The power switching circuit is coupled to the control circuit and outputs a first voltage signal at a first node to supply power to the control circuit according to the power control signal. The first capacitor is coupled to the first node. The charge/discharge control circuit is coupled between the first node and the second capacitor and controls whether the second capacitor is charged or discharged according to the first voltage signal.
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Family
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