Abstract
Due to the electrical isolation nature of wireless power transfer (WPT) system, a method that can obtain the receiver side parameter only based on transmitter side information is desirable. However, typical estimation scheme assume that the coil inductance and compensation capacitance are constant, which will cause large estimation errors in high frequency system. Therefore, a multiple parameters estimation algorithm that can simultaneously identify load resistance, mutual inductance and receiver coil inductance is proposed in this paper, where only the input current and voltage are needed to be measured. Moreover, in order to cope with capacitor aging effect and manufacturing tolerance, compensation capacitance estimation algorithm is also presented. Mathematical model and algorithm procedure are depicted thoroughly and the gradient descent approach is adopted to obtain the optimal estimated parameter. The uniqueness of solution and the validity of this approach are strictly proved as well. Finally, a WPT experimental prototype with Class-D inverter is implemented and the experimental results are provided to verify the availability and accuracy of the proposed algorithm.
Highlights
In recent years, wireless power transfer (WPT) technology has attracted significant research interests and becomes an available and practical technology, covering electrical vehicle [1]–[5], consumer electronics [6]–[8], and implantable medical device [9]–[13], etc
Gallium nitride (GaN) GP165030DF0 is selected as power switch of Class-D inverter, and the corresponding isolation driver IC is SI8271GB
This paper proposes a multiple parameters estimation scheme that can simultaneously estimate load resistance, mutual inductance and receiver coil inductance or compensation capacitance, using only the measurement data of input current and voltage
Summary
Wireless power transfer (WPT) technology has attracted significant research interests and becomes an available and practical technology, covering electrical vehicle [1]–[5], consumer electronics [6]–[8], and implantable medical device [9]–[13], etc. Due to the electrical isolation nature of wireless power transfer system, how to obtain information on the load side has become one of the key issues. It is intuitive to apply wireless communication to get load side information [14], but this methodology would bring additional bulk and system complexity [15], which is not applicable in some scenarios such as implantable medical device. A mutual inductance and load resistance estimation algorithm is proposed in [17]. This algorithm cannot accurately identify parameters at resonance frequency.
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