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Power supply circuit and method for stable system turn-off

  • US 20060072268A1
  • Filed: 09/30/2005
  • Published: 04/06/2006
  • Est. Priority Date: 10/06/2004
  • Status: Abandoned Application
First Claim
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1. A power supply circuit equipped with a main power source and a backup power source for stably turning off a system, the power supply circuit comprising:

  • a first switch for providing a driving voltage from the main power source to the system;

    a second switch for providing a driving voltage from the backup power source to the system when the main power source is detached from the system;

    a controller for generating a control signal for opening the first switch and closing the second switch when detachment of the main power source from the system is detected; and

    a memory for storing user data.

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