DOORBELL DEVICE AND POWER SUPPLY METHOD THEREFOR
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United States of America Patent
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Issued Date -
Jan 17, 2019
app pub date -
Jan 3, 2017
filing date -
Jan 3, 2017
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Abstract
According to one embodiment of the present invention, a doorbell device comprises: a power input unit; an interface unit; a battery unit for supplying power to the interface unit; a switching circuit connected to a doorbell switch so as to change a path of a current supplied from the power input unit according to an on/off state of the doorbell switch; and a control unit for charging the battery unit by using a current outputted from the switching circuit, wherein the control unit performs control such that the battery unit supplies power to the interface unit if the current outputted from the switching circuit toward the control unit is cut off.
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