BATTERY-BACKED POWER INTERFACE TRANSFORMER FOR LOW-POWER DEVICES
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United States of America Patent
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app pub date -
Feb 27, 2012
filing date -
Aug 29, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A power interface enables a low-power device to be powered from an alternating current (AC) wall receptacle or light socket with automatic backup battery charging. The power interface of an embodiment comprises a transformer module that receives an input signal. The device includes a battery module coupled to the transformer module, and the battery module includes battery charging circuitry coupled to a battery. The device comprises an output controller coupled to the transformer module and the battery module. The output controller includes detector circuitry that detects a state of the input signal. The output controller automatically controls coupling of one of a transformer module output and a battery module output to a device output according to the state of the input signal.
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