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Analysis and Design of Multicell DCDC Converters Using by Thierry Meynard

By Thierry Meynard

Shows how the suggestions of vectorization and layout mask can be utilized to assist the clothier in evaluating assorted designs and making the appropriate offerings. The e-book addresses sequence and parallel multicell conversion at once, and the suggestions might be generalized to explain different topologies.

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Additional info for Analysis and Design of Multicell DCDC Converters Using Vectorized Models

Example text

2 (left). e. when the step occurs within the switching period. In a real system, such steps will happen at each period, and although their amplitude will be generally very small, their effects will combine through the pure integral action to generate what seems to be an erratic behavior when observed over long time intervals. To solve this problem, the first cell that is affected must not apply the positive step at once otherwise the integral of its control signal will inevitably be higher than the others; the same applies to the second cell, and only the third can follow the step immediately.

The reference signal includes a sinusoidal component that generates many small steps of continuously varying amplitude, and this does not significantly affect balance except for special conditions. But the reference also includes steps at a frequency that is not an integer divider of the switching frequency (which would make it worse by always applying the perturbation on the Vectorized Modulator for Multilevel Choppers 41 same cell), to show how the reference steps affect balance. It can be seen that with a standard control, balance is severely affected on a very short time scale, while equalizing multisampler maintains the system perfectly balanced.

Using none of these options may result in unbalanced operation. 7. 3. Handling fast transients (at the sampling frequency) There is, however, one point that needs further development. A real system needs to be protected against Vectorized Modulator for Multilevel Choppers 45 short circuit, voltage overshoot, etc. This is a serious issue especially when multilevel converters allow reducing the amount of energy stored in the filters which makes it more sensitive to outer perturbations. As a consequence, it may be needed to have a faster response in case of emergency, and we may want to saturate the duty cycles of all cells at the same time.

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