Capacitor voltage balancing wire

Why is capacitor voltage balancing important?

Abstract: Capacitor voltage balancing is a critical issue for neutral-point-clamped-based converters, including the two/three-level dual-active-bridge dc–dc converters. The unbalanced capacitor voltage will increase the voltage stress on power devices and negatively affect the reliability of the converters.

What is a capacitor voltage balancing strategy with n-capacitors in series?

A capacitor voltage balancing strategy with n -capacitors in series should be devised. It should develop from the balancing strategy of two capacitors in series. The influence of the switching sequence should be investigated also. Lijun Zhang: Writing – original draft, Writing – review & editing, Conceptualization, Methodology, Validation.

Does a flying capacitor have a voltage balance?

In this study, voltage balancing of the flying capacitor as well as the DC link capacitors under soft-switching operations is characterized through both simulation and experimentation. A voltage balance of a flying capacitor means that the two inner devices can then be clamped like that of the conventional two-level inverter.

What problems should be solved during the capacitor voltage balancing process?

Two typical problems during the capacitor voltage balancing process should be solved, i.e., power fluctuation minimization and determination of the transformer current polarity. Accordingly, this article proposes a balancing control scheme based on the complementary switching-state (CSS) method.

How to balancing a capacitor?

The balancing circuit with resistors and diodes are a simple solution, but with high power losses and modest performances. An improved solution is to use transistors to bypass the charging current, when an overvoltage is detected at each capacitor terminals.

What happens if a capacitor voltage is unbalanced?

The unbalanced capacitor voltage will increase the voltage stress on power devices and negatively affect the reliability of the converters. Two typical problems during the capacitor voltage balancing process should be solved, i.e., power fluctuation minimization and determination of the transformer current polarity.