Coupled inductors in interleaved multiphase three-level DC-DC converter for high power energy storage applications

This paper investigates and evaluates coupled inductors in interleaved multiphase three-level DC-DC converters. If non-coupled inductor is used and maintaining the inductance of inductor, multiphase three-level DC-DC converter interleaving operation will increase the inductor current ripple, although the overall output current ripple and common mode voltage will be smaller. To reduce the inductor current ripple, inverse-coupled inductor is employed. The current ripple in the coupled inductor is analyzed and verified by simulations. By adding coupled inductor and interleaving, we can achieve smaller inductor current ripple, smaller total output current ripple as well as smaller CM voltage simultaneously.