Abstract
In this paper, a 1-kW DC-DC buck converter with a four-phase interleaved matrix inductor is proposed for battery charging applications. It is well-known that the DC bias on the inductor will cause high core loss as it changes the B–H characteristic. Typically, the transient conduction mode employed in high voltage applications for zero-voltage-switching of devices would cause higher inductor current ripple. The conventional approach to reduce the effect of DC bias and inductor current ripple is employing multi-phases. However, the cost and size of the converter will increase significantly. This paper proposes the matrix inductor which has a small volume and reduces the effect of the DC bias by flux sharing and flux cancellation at the same time, results in low inductor core loss. With the interleaved operations the output current ripple can be lower which is suitable for battery charging application. Besides, the comparison of the synchronous and interleaved operation is presented. A 1-kW prototype is built and the experimental results show that the peak efficiency is 99.1% and 99.2% for synchronous and interleaved control, respectively. Additionally, the output current ripple of the interleaved operation is reduced by 85% in comparison with the synchronous operation.
Highlights
The inductive power transfer (IPT) has been paid more attention due to the advantages, such as safety and convenience, compared to the traditional wired systems
The inductor current ripple is high in the CRM operation, results in high core loss
Comparing with the synchronous operation, the output current ripple of the interleaved operation is more than four times smaller because of the transient conduction mode (TCM) operation and the phase shift
Summary
The inductive power transfer (IPT) has been paid more attention due to the advantages, such as safety and convenience, compared to the traditional wired systems. Several solutions have been presented such as compensation topologies or coil design to reduce the output fluctuation and to achieve constant current or constant voltage output [2,3,4]. The two-stage IPT system which includes the regulated DC-DC buck converter for output battery application has been presented in the literature. In this approach, the IPT stage can be designed to achieve higher efficiency with wide output variation. This paper proposes the interleaved matrix inductor for the four-phase DC-DC buck converter. A 1-kW prototype is successfully built and tested to verify the feasibility of the proposed converter
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