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Power management system including a power controller for switching components to low or high power state based on signals received from power modules

  • US 6,931,555 B2
  • Filed: 03/21/2001
  • Issued: 08/16/2005
  • Est. Priority Date: 03/22/2000
  • Status: Expired due to Fees
First Claim
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1. A power management system for electrical or electronic apparatus having a number of components which may be switched to a low power state, comprising a power controller coupled to each component in the electrical or electronic apparatus and a plurality of power modules, each associated with a component, wherein each power module is coupled to the power controller for each component its associated component makes use of, and sends signals to that power controller indicating whether or not its associated component wishes to make use of the component coupled to that power controller, and the power controller switches its component to a low or high power state in dependence on received signals, wherein the power management system further comprises a system timer for scheduling predetermined switches between low and high power states, said system timer causing the component to switch to a low power state only if a time interval until the next scheduled high power state exceeds a predetermined limit.

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