Abstract
The paper puts forward a method for predicting output voltage and resistance of a series-series (SS) compensated inductive wireless power transfer (IWPT) link operating at load-independent-voltage-output (LIVO) frequency. The link is a part of the static system (reported by the authors in earlier works), wirelessly delivering power into an enclosed compartment without any secondary-to-primary feedback. The proposed algorithm employs input DC-side quantities (which are slow-varying and nearly noise-free, thus measured utilizing low-cost, low-bandwidth sensors) only to monitor output DC-side quantities, required for protection and/or control. It is shown that high estimation accuracy is retained as long as system parameter values are known and the phasor-domain equivalent circuit is valid (i.e., upon continuous-conduction mode (CCM) of the diode rectifier, where the proposed methodology utilizes the recently revealed modified diode rectifier equivalent model for enhanced accuracy). Under light loading (i.e., in discontinuous conduction mode (DCM)), a nonlinear correction is combined with the proposed technique to retain accuracy. The proposed methodology is well-verified by application to a 400 V to 400 V, 1 kW static IWPT link by simulations and experiments.
Highlights
Where PO denotes the load power, PO,B signifies load power level corresponding to the bound between conduction mode (CCM) and DCM, PO,MIN represents minimum allowed IWPT link (IWPTL) load power [20] and VO,B and VO,MAX symbolize output DC-side voltages corresponding to PO,B and PO,MIN, respectively
It is well-evident that neglecting patristics resistances r1 and r2 reduces the first row of Equation (36) to Equation (35)
Due to the fact that CCM is assumed for the phasor domain solution Equation (10), inductive wireless power transfer (IWPT)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. For SS-compensated IWPT links, two operating frequencies were shown to yield loadindependent voltage output, one residing below (capacitive region) and the other above (inductive region) resonant frequency [14,15], both being coupling coefficient dependent In case the latter is constant and known (such as in case of wireless power delivery system into enclosed compartment, where transmitting and receiving coils reside statically on two sides of the compartment walls [12,16,17]), load-independent voltage output (LIVO) may be ideally achieved at the design stage, and the system may potentially be feedback-free [12].
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