Abstract
To improve the reliability in wireless power transfer system, communication is widely used. An independent coil as the signal coil for data transfer has the advantage of decoupling power coupling mechanism and signal coil when designing the system. Besides, in some application, vertical offset of the power coil may impact the stability of the system, position detection of the receiver side power coil is needed. Method of using the signal coil for vertical offset detection is adopted in this paper, simulation result verified the feasibility. The vertical offset of the power coil can be estimated by an exponential function based on the system parameter and the current of the primary side power coil. The exponential fitting function used in the paper can be used as a reference when designing the detection.
Highlights
Wireless power transfer (WPT) technology has been widely applied for the advantage of convenience and safety compared with cable transfer [1,2,3]
A separate signal transmission technology has the merits of decoupling the power transfer and communication, but an additional signal coil is required [11]
It can be seen that when the excitation current of the primary coil is fixed, the induced voltage of the primary D shape signal coil has an exponential relationship with the vertical offset distance
Summary
Wireless power transfer (WPT) technology has been widely applied for the advantage of convenience and safety compared with cable transfer [1,2,3]. Finite element method (FEM) is used to analyse and optimize the size of the signal coil to ensure stable signal transmission while maximizing the performance of the vertical offset detection. The secondary side power coil induces a voltage in the high-frequency magnetic field, and the compensation network together with the rectifier circuit outputs a stable DC power to supply the load (circuit). The core part of the magnetic coupling resonance wireless power transfer (MCR-WPT) system is the coupling mechanism, which determines the energy transfer performance of the system. Parameters coil inductance (Lp) coil DC resistance (Rp) coil inductance (Ls) coil DC resistance (Rs) Mutual inductance (M) Coupling coefficient (k)
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