Universal multiple device power adapter and carry case

  • US 7,224,086 B2
  • Filed: 07/03/2003
  • Issued: 05/29/2007
  • Est. Priority Date: 11/01/2002
  • Status: Expired due to Fees
First Claim
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1. A power adapter comprising:

  • an input configured to receive input power;

    a switch coupled to the input and configured to selectively couple the input to one of a low-voltage output and a high-voltage output, the switch being in one of a low-voltage position and a high-voltage position, respectively;

    a selector circuit coupled to the input and to the switch and configured to provide a control signal to the switch such that the switch will be in the low-voltage position if the input receives input power having a DC voltage lower than a threshold voltage and will be in the high-voltage position if the input power has an AC voltage higher than the threshold voltage; and

    a low-voltage cutout circuit configured to inhibit electrical current from flowing through the switch if the voltage input power is below a low-voltage cutout threshold, wherein the value of the low-voltage cutout threshold is determined by a peak inverse voltage of a zener diode within the low-voltage cutout circuit.

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