Wireless Charging Without Keyless Entry Interference
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Summary
Problems
Wireless power transfer systems interfere with the operation of vehicle remote keyless entry systems by saturating the receive antennas, compromising signal reception and processing.
Innovation solutions
A controller in the wireless power transfer system detects the transmission of a vehicle communication signal and reduces the charging power level during a portion of the transmission period to allow for signal identification by the receiver, ensuring compatible operation between wireless power transfer and remote keyless entry systems.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If wireless power transfer systems operate at high power levels, then charging efficiency is improved, but interference with vehicle remote keyless entry systems increases
Why choose this principle:
The wireless power transfer system operates in periodic cycles, alternating between high-power charging mode and low-power or zero-power mode. During each cycle, the system transmits power at high levels for a portion of the period to maintain charging efficiency, then reduces or stops transmission during intervals when remote keyless entry signals are detected or expected, allowing both functions to operate effectively without continuous interference
Principle concept:
If wireless power transfer systems transmit continuous power, then charging speed is improved, but signal reception by remote keyless entry systems deteriorates
Why choose this principle:
The system detects remote keyless entry signals in advance and proactively reduces or suspends wireless power transmission before the signals are fully transmitted. This preliminary action prevents the high-power field from saturating the receive antennas during critical signal reception windows, ensuring reliable communication while maintaining overall charging speed through efficient power transfer during non-signal periods
Application Domain
Data Source
AI summary:
A controller in the wireless power transfer system detects the transmission of a vehicle communication signal and reduces the charging power level during a portion of the transmission period to allow for signal identification by the receiver, ensuring compatible operation between wireless power transfer and remote keyless entry systems.
Abstract
Methods and apparatuses for transmitting charging power wirelessly are provided. One implementation includes an apparatus for transmitting charging power wirelessly to a vehicle. The apparatus comprises a transmit circuit configured to transfer wireless charging power to the vehicle via a wireless field. The apparatus comprises a controller configured to detect transmission of a wireless vehicle signal having a transmission period and indicative of operation of a vehicle communication system. The controller is configured to cause the transmit circuit to reduce a level of charging power within a first portion of the transmission period. A second, remaining portion of the transmission period is of sufficient duration for allowing identification of the wireless vehicle signal by a receiver of the wireless vehicle signal. The wireless vehicle signal comprises a plurality of pulses. At least one pulse is transmitted within the first portion. The remaining pulses are transmitted within the second, remaining portion.