Power supply unit

  • US 9,391,474 B2
  • Filed: 06/26/2013
  • Issued: 07/12/2016
  • Est. Priority Date: 03/30/2007
  • Status: Active Grant
First Claim
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1. A method for controlling the supply of power to a parking meter comprising:

  • a) monitoring, by a control unit, a status of a main battery which is rechargeable and a back-up battery which is non-rechargeable;

    b) charging at least partially, by the control unit, the main battery via one or more charging sources;

    c) supplying power, by the control unit, to the parking meter primarily from the main battery;

    d) switching the supply of power, by the control unit, to come from the back-up battery when the voltage across the main battery falls below a predetermined level;

    e) supplementing the supply of power during a peak power demand, by the control unit, to the main battery by utilizing at least one capacitor; and

    f) signaling, by the control unit, a wireless communication device to communicate a status message to a control system external to the parking meter regarding the status of the main batter and the back-up battery;

    wherein the main battery, the back-up battery, the at least one capacitor, the wireless communication device, and the control unit are received within the parking meter.

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