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Step-up regulator with multiple power sources for the controller

  • US 7,714,546 B2
  • Filed: 02/12/2007
  • Issued: 05/11/2010
  • Est. Priority Date: 03/08/2006
  • Status: Expired due to Fees
First Claim
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1. Switching power supply circuitry, comprising:

  • a step-up converter for switching a DC input voltage by means of a switch element to obtain a DC output voltage boosted from the input voltage,a step-up power supply for a control circuit, the step-up power supply for a control circuit for boosting the input voltage and outputting a second boosted voltage, anda control circuit supplied with power at the second boosted voltage from the step-up power supply for a control circuit, the control circuit for controlling the switch element of the step-up converter when the second boosted voltage from the step-up power supply for a control circuit is equal to or higher than a predetermined operation start voltage, wherein only the output voltage of the step-up converter is supplied to a load.

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