Abstract
Multiple power outputs are necessary in applications such as isolated gate drivers for multilevel converters or DC motor drive. Meanwhile, efficient and reliable data transfer is also essential to achieve satisfactory control performance. In this letter, a simultaneous power and data transmission method is proposed for multi-output wireless power transfer (WPT) systems. An intermediate unit, formed by two unipolar coils with ferrite cores and an aluminum plate in between for mutual coupling enhancement and coupling area shaping, not only can transfer power to adjacent units but also supply power to local loads. Hence, multiple outputs can be achieved. Then, bipolar coils, placed in overlap with the same-side power transfer coils to form a compact and symmetrical structure, are used to transfer data. Such data transfer coils are naturally decoupled with the power transfer coils, leading to a straightforward design of the data processing circuit. Besides, data can be transferred between adjacent circuit units, which facilitates the monitoring and control of all outputs. The feasibility of the proposed coupling structure and the parallel transmission of power and data are verified on a laboratory prototype with two output voltages, and the transfer distance is 20mm while the output power is 180W. The system efficiency reaches 90%, and the data transfer rate is 19.2kb/s.
Highlights
Wireless power transfer (WPT) has attracted more and more attention, thanks to its merits such as safety and convenience, compared with traditional wire-based power transfer technologies [1]-[6]
Recent researches have shown that such systems with intermediate coils feature the following advantages: (1) Owning to the fact that the magnetic field can be excited continuously along the power transfer path, high system efficiency can be maintained over a long transfer distance
It can be seen that, the data processing circuit of the transmitter side consists of an amplitude shift keying (ASK) modulation achieved by using CD4051 chip and a power amplifier formed by 2N5551 and 2N5401 chips
Summary
Wireless power transfer (WPT) has attracted more and more attention, thanks to its merits such as safety and convenience, compared with traditional wire-based power transfer technologies [1]-[6]. WPT systems follow a two-coil structure with only one output voltage. Methods using one transmitter and one receiver, in which multiple double T circuits [1] or DCDC converters [12] are connected in parallel to the common port of the receiver, can provide multiple output voltages. Reference [10] proposes a WPT system by using intermediate coils to supply six isolated voltages at the same time for the gate drivers of multilevel converters. E.g., in reference [17], power is transferred by the magnetic field excited by coupling coils, while data is transferred by electric field excited by the aluminum plates and the parasitic capacitors. To fill the technical gaps mentioned above, a new coupling structure based power and data parallel transmission method for multi-voltage-output WPT systems is proposed here.
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