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Current mode buck-boost converter

  • US 8,912,769 B2
  • Filed: 01/20/2012
  • Issued: 12/16/2014
  • Est. Priority Date: 04/29/2011
  • Status: Active Grant
First Claim
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1. A current mode buck-boost converter, having an input terminal, an output terminal and an output capacitor coupled to the output terminal, the input terminal being used to receive an input voltage, the output terminal being used to generate an output voltage, the current mode buck-boost converter comprising:

  • a voltage converter comprising an inductor; and

    a control circuit for detecting a current passing through the inductor to determine an electrical energy transmitted to the output terminal by the voltage converter, the control circuit comprising;

    a first switch coupled to the input terminal and a second terminal of the inductor; and

    a second switch coupled to the output terminal and a first terminal of the inductor;

    wherein the control circuit controls the first switch and the second switch according to a system controlling voltage to raise the output voltage from a standby voltage to an operating voltage or reduce the output voltage from the operating voltage to the standby voltage, wherein the standby voltage is lower than the input voltage, and the operating voltage is higher than the input voltage, and the system controlling voltage is used to indicate a load power requirement.

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