The dual-channel magnetically integrated chargers for plug-in electric vehicles

In this paper, a dual-channel isolated three-phase magnetically integrated chargers (MICs) are presented for plugin electric vehicles. The key is to apply and operate two interleaved power charging circuits, each of which is composed of one dual-active-bridge (DAB) isolated converter and one three-phase grid inverter. The proposed configuration not only offers isolated charging but also provides modular design and operation for each channel, which are useful for high-power applications in fast charging. The interleaved operation and the phase-shifted carriers enable low current ripple on battery side and better harmonic performance on grid side. Furthermore, chaotic modulation has been applied to reduce the distinct switching harmonics in spectrum, which will facilitate improving the conducted electromagnetic compatibility (EMC). The detailed design of modulation strategy and control scheme are described in this paper. Experimental results have been presented for a 1-kW laboratory prototype to verify the validity of the proposed configuration and schemes.

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