Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 9, Pages 8999-9002Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3013522
Keywords
Decoupled; dual-side phase-shift control; inductive power transfer (IPT); phase synchronization; wireless power transfer (WPT); zero crossing detection (ZCD)
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Funding
- Singapore Maritime Institute as part of the Research Program of Maritime Research [SMI-2019-MA-02]
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This paper proposes a dual-side phase-shift implementation method for wireless power transfer, which regulates the phase difference between the primary-side power and driving windings to control the phase difference between the dual-side power windings, achieving independent dual-side regulation from power transfer.
The isolated feature between primary and secondary sides in wireless power transfer requires dual-side communication, phase synchronization, and two controllers on both sides. The phase difference between dual-side ac voltages can be changed for output regulation or bidirectional power flow. Zero crossing detection of the secondary ac voltage or current is normally conducted for frequency locking and phase synchronization. However, it is inaccurate at light-load conditions for high-power applications due to a large sensing scale and much noise; also, it can generate undesired results with discontinuous or distorted waveforms having more than two zero crossing points in one cycle. To solve these issues, this letter proposes a dual-side phase-shift implementation method using driving windings to regulate the dual-side phase difference conducted only on the primary side. By controlling the phase difference between the primary-side power and driving windings, the phase difference between the dual-side power windings can be regulated. In this way, the dual-side regulation is independent from power transfer to get rid of the issues of the conventional phase synchronization method, and bidirectional power flow can be more easily realized.
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