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Methods and apparatus for charging a battery in a peripheral device

  • US 20030075993A1
  • Filed: 10/22/2002
  • Published: 04/24/2003
  • Est. Priority Date: 10/22/2001
  • Status: Active Grant
First Claim
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1. A power manager unit for managing power delivered to a battery powered device, comprising:

  • a voltage converter unit arranged to convert an external voltage received by an external voltage supply by way of a cable to a supply voltage, wherein the cable includes a number of lines some of which are data lines arranged to form a transmit-receive connection and some of which are power lines arranged to carry the external voltage from the external power supply to the device;

    a voltage sensor unit coupled to the voltage converter unit for sensing a voltage;

    a comparator unit coupled to the voltage sensor unit arranged to generate a switching signal based upon the sensed voltage; and

    a switchover circuit coupled to the comparator circuit arranged to receive the switching signal, wherein the switching circuit responds to the received switching signal by connecting the device and an uncharged battery to the voltage converter unit such that the supply voltage is provided thereto.

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