A charging frequency between a transmitting coil and a receiving coil of a wireless power transfer (WPT) system is found by setting an input voltage to the transmitting coil at a fixed voltage, shunting the receiving coil, determining an input current frequency range in which a resonant frequency is expected to be found, frequency polling within the first input current frequency range using a set of polling frequencies in the input current frequency range, and selecting as the charging frequency a polling frequency having a lowest input current. Alternatively, the charging frequency may be determined by determining, at each polling frequency within the input current frequency range, a ratio of current in the receiving coil and current in the transmitting coil and selecting as the charging frequency a polling frequency where a peak of the ratio of the current in the receiving coil and the current in the transmitting coil is found.
Charging Frequency Determination for Wireless Power Transfer
27.02.2025
Patent
Elektronische Ressource
Englisch
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