Power supply unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 20, 2013
Issued Date -
N/A
app pub date -
Mar 31, 2008
filing date -
Mar 30, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A power supply unit for supplying power to a device has a rechargeable, main battery; a charging arrangement for charging the main battery; a non-rechargeable back-up battery; load terminals for connection to a load; and a control unit for controlling supply of power to the load primarily from the main battery and secondarily from the back-up battery. The device is, in particular, a single bay, stand alone parking meter. In the event that the main battery runs low, the control unit is configured to supply power to the load from both the main battery and the back-up battery or only from the back-up battery. The back-up battery is easily replaceable, and the power supply unit has a bay, with connectors for receiving the back-up battery. The main battery is charged from solar panels. A communication device is provided to communicate status messages wirelessly to a control system.
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