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Dual interleaved DC to DC switching circuits realized in an integrated circuit

  • US 5,870,296 A
  • Filed: 10/14/1997
  • Issued: 02/09/1999
  • Est. Priority Date: 10/14/1997
  • Status: Expired
First Claim
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1. A DC to DC switching circuit for controlling power switching devices in a DC to DC converter having first and second interleaved converter circuits operating into a common load comprising:

  • a current sense circuit sensing the voltage across a sense resistor in series with the power supply supplying power to the power switching devices;

    a first pulse width modulator controlling the power switching devices of the first converter circuit;

    a second pulse width modulator controlling the power switching devices of the second converter circuit;

    a feedback circuit responsive to the voltage across the common load;

    control circuits for controlling the first and second pulse width modulators responsive to the feedback circuit and a commanded output voltage;

    the control circuits also being responsive to the difference in the voltage across the sense resistor when the first converter is drawing power from the power supply through the sense resistor and the second converter is not, and when the second converter is drawing power from the power supply through the sense resistor and the first converter is not, to adjust the relative duty cycle of the first and second converters to tend to minimize the difference in the voltage across the sense resistor;

    the current sense circuit, the first pulse width modulator, the second pulse width modulator, the feedback circuit and the control circuits being in a single integrated circuit.

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