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Switching power supply device

  • US 7,348,766 B2
  • Filed: 05/25/2006
  • Issued: 03/25/2008
  • Est. Priority Date: 06/03/2005
  • Status: Expired due to Fees
First Claim
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1. A switching power supply device comprising:

  • a first source voltage supply arrangement operable to supply a first supply voltage;

    a PWM signal generator operable to generate a PWM signal;

    a first switching arrangement operable to switch the first supply voltage based on the PWM signal;

    a converter operable to convert the switched first supply voltage to a second supply voltage;

    a difference signal detector operable to output the difference between the second supply voltage and a predetermined reference voltage as a difference signal;

    an intermittent controller operable to stop the switching operation of the first switching arrangement when the difference signal is less than or equal to a first threshold value;

    a current converter operable to convert the difference signal to a current signal; and

    a voltage converter operable to convert the current-converted difference signal to a voltage signal;

    wherein the PWM signal generator varies the pulse width of the PWM signal based on the voltage-converted difference signal and generates the PWM signal.

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