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  • #2

Closed
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Created Aug 04, 2021 by Jean Alinei@jalineiOwner0 of 4 tasks completed0/4 tasks

Current mode not stable enough

Context

The converter makes noise while operating in current mode.

Description

The duty cycle of the power converter oscillates a lot in operation. This has been observed in open-loop and is independent of the control loop.

The harmonic content of the current measurements were studied for leg 1 on converter 2. This harmonic content shows some noise near the switching frequency and, more generally, a lot of noise on the current measurement.

Another potential problem is the fact that the measurement chain has a signal-to-noise ration that might be too small. The current measurement range is +/- 60A while the maximum expected current is +/- 8A.

Actions

  • Document the noise on the current measure with the existing hardware
  • Study a physical LC filter for the measurements
  • Test the current mode with the filter and document the results for a single leg
  • Brainstorm changes to the measurement chain in order to rise the signal-to-noise ratio and document them
Edited Aug 25, 2021 by Jacques Labaisse
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