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Control device and method for regulating a multiphase DC-DC converter

  • US 9,653,995 B2
  • Filed: 09/04/2013
  • Issued: 05/16/2017
  • Est. Priority Date: 10/24/2012
  • Status: Active Grant
First Claim
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1. A control device for controlling a polyphase DC-to-DC voltage converter (10) which has a first converter branch (11) and a second converter branch (12) connected in parallel with the first converter branch (11), the control device comprising:

  • a switching signal generator (3) configured tocalculate measured values for current in the converter branches (11;

    12),compare, for the first converter branch (11), the calculated measured value (M1) of the current (I1) in the first converter branch (11) to a first upper current threshold value (Lo1) and a first lower current threshold value (Lu1) and to generate, on the basis of the comparison, a first actuation signal (S1) for switching devices (41;

    42) of the first converter branch (11), andcompare, for the second converter branch (12), the calculated measured value (M2) of the current (I2) in the second converter branch (12) to a second upper current threshold value (Lo2) and a second lower current threshold value (Lu2) and to generate, on the basis of the comparison, a second actuation signal (S2) for switching devices (41;

    42) of the second converter branch (12); and

    a threshold-value generator (2) coupled to the switching signal generator (3) and configured togenerate upper and lower current threshold values (Lo1, Lu1;

    Lo2, Lu2) for the switching signal generator (3),calculate a present phase shift (dT) of the actuation signals (S1;

    S2) for the switching devices (41;

    42) in the first and second converter branches (11;

    12), andtemporarily change the second upper current threshold value (Lo2) and/or the second lower current threshold value (Lu2) on the basis of the calculated phase shift (dT);

    wherein the upper and lower current threshold values (Lo1, Lu1;

    Lo2, Lu2) have constant predefinable values, and wherein the threshold value generator (2) is designed to keep the constant values of the second upper current threshold value (Lo2) and/or of the second lower current threshold value (Lu2) changed until the calculated phase shift (dT) has reached a predefinable target shift.

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