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Fan speed controller

  • US 7,479,753 B1
  • Filed: 02/24/2004
  • Issued: 01/20/2009
  • Est. Priority Date: 02/24/2004
  • Status: Expired due to Term
First Claim
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1. A fan speed controller comprising:

  • a pulse width modulation generator for generating a pulse width modulation signal, said pulse width modulation generator further for generating a complement of said pulse width modulation signal, wherein an operating frequency of said pulse width modulation generator is approximately within the range of 200-1,000 KHz; and

    a drive stage circuit coupled to said pulse width modulation generator and for switch mode converting a supply voltage into a linear voltage for driving a fan, wherein a voltage level of said linear voltage is a function of said pulse width modulation signal, and wherein said drive stage circuit is further for switch mode converting said supply voltage into said linear voltage in accordance with said pulse width modulation signal and said complement of said pulse width modulation signal.

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