Power supply unit

  • US 8,513,832 B2
  • Filed: 03/31/2008
  • Issued: 08/20/2013
  • Est. Priority Date: 03/30/2007
  • Status: Active Grant
First Claim
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1. A power supply unit for supplying power to a parking meter, the power supply unit includinga rechargeable, main battery;

  • a charging arrangement for charging the main battery;

    a set of connectors for a back-up battery;

    a wireless communication device for communicating a status message regarding the state of the main battery and the state of the back-up battery to a control system external to the parking meter;

    a set of load terminals for connection to a load;

    a control unit for controlling supply of power to the load primarily from the main battery and secondarily from the back-up battery; and

    a housing that encloses the main battery, the back-up battery, the control unit, and the wireless communication device;

    wherein the housing includes the load terminals and is received within the parking meter.

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