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Step-up/down DC-to-DC converter

  • US 5,831,418 A
  • Filed: 07/08/1997
  • Issued: 11/03/1998
  • Est. Priority Date: 12/03/1996
  • Status: Expired due to Term
First Claim
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1. In a DC-to-DC (expressed as "DC/DC" below) converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;

  • a step-up/down DC/DC converter comprising;

    voltage comparison means for comparing the input voltage and the output voltage; and

    operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that said input voltage is higher than said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said output voltage is higher than said input voltage.

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