Integrated magnetics optimization process for an interleaved three‐phase buck converter at 500 kHz
- Resource Type
- article
- Authors
- Yu‐Chen Liu; Chen Chen; Yu‐Chen Chung; Meng‐Chi Tsai; Katherine A. Kim
- Source
- IET Power Electronics, Vol 16, Iss 10, Pp 1743-1753 (2023)
- Subject
- Electronics
TK7800-8360
- Language
- English
- ISSN
- 1755-4543
1755-4535
Abstract The optimization of magnetics in power converters switching at high frequencies is needed to achieve high power density and high efficiency. This work provides the design and optimization process of a coupled inductor used in a three‐phase interleaved buck converter that is part of a two‐stage motor drive circuit. The converter uses wide‐bandgap switch devices to reduce switching losses under high‐frequency operation and a coupled inductor that integrates three independent inductors to reduce the number and size of magnetic components. The relationship between the equivalent inductance of the coupled inductor and the coupling coefficient is analysed for different core shapes under various duty cycles. The optimization procedure for the three‐phase coupled inductor core structure is presented that allows for the coupling coefficient to be reduced by adding magnetic volume to reduce the inductor current ripple, while the core loss is reduced by 10.5%. A prototype of the 500‐W three‐phase interleaved converter that operates at 500 kHz with the proposed integrated magnetics technology was tested in experiment, exhibiting a maximum efficiency of 98.63% at full load power.