Antenna Decoupling Device for Wireless Charging Interference
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Solution Overview
Problem
Wireless energy coupling systems in motor vehicles experience interference issues due to high voltage rates at the coil terminals, leading to electromagnetic and capacitive coupling of interference into antenna units, which disrupt wireless communication links.
Innovation Solution
A decoupling device is implemented to electrically decouple the coil from the antenna unit, utilizing capacitive coupling adjustments and impedance converters to reduce parasitic capacitances and common mode signals, and incorporating galvanic isolation and shielding to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless magnetic coupling is implemented for energy supply, then mechanical coupling is eliminated and ease of operation is improved, but electromagnetic interference is generated that disrupts wireless communication
Solution Approach 1:
A decoupling device is introduced as an intermediary component between the coil and the antenna unit. This decoupling device includes capacitive coupling adjustments and impedance converters that act as mediators to reduce parasitic capacitances and block common mode signals, thereby preventing electromagnetic interference from reaching the antenna unit while allowing the wireless energy coupling system to operate
Solution Approach 2:
The harmful electromagnetic interference is extracted and removed from the system by using the decoupling device to separate the energy coupling function from the communication function. The decoupling device extracts common mode signals and parasitic capacitances that cause interference, allowing the antenna unit to operate independently for wireless communication without being affected by the energy coupling operations
2Use of energy by moving object
If coil is connected directly to rectifier unit, then energy transfer efficiency is improved, but electromagnetic coupling to antenna unit increases causing communication disruption
Solution Approach 1:
The decoupling device serves as an intermediary between the coil and the antenna unit, allowing energy to be transferred efficiently from the coil to the rectifier unit while blocking electromagnetic coupling to the antenna unit. The impedance converters and capacitive coupling adjustments in the decoupling device enable this selective transmission by matching impedances and filtering out common mode signals
3Reliability
If antenna unit is electrically insulated from electrical system, then communication reliability is improved, but electromagnetic interference from coil still couples into antenna
Solution Approach 1:
The decoupling device converts the harmful parasitic capacitance into a beneficial component by using capacitive coupling adjustments. The parasitic capacitances are not simply blocked but are actively managed and adjusted to work in favor of the system by matching them with opposing capacitive elements in the decoupling device, thereby canceling out their harmful effects while maintaining electrical insulation
Solution Approach 2:
The decoupling device changes the electrical parameters of the system by using impedance converters to transform the impedance levels and capacitive coupling adjustments to modify the capacitive relationships. These parameter changes allow the antenna unit to remain electrically insulated while preventing interference by altering the electrical characteristics to block common mode signals
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The decoupling device effectively reduces undesired interference, ensuring reliable operation of the antenna unit and wireless communication links by minimizing capacitive and electromagnetic coupling, thus enhancing the reliability of wireless communication during energy coupling operations.
Implementation Method 1
the coil detects the alternating magnetic field, takes energy from it, and supplies electric energy at the motor vehicle end
Implementation Method 2
utilizing capacitive coupling adjustments and impedance converters to reduce parasitic capacitances and common mode signals
Data Source
AI summary
A motor vehicle having a vehicle body, which is formed at least in part from an electrically conductive material. An electrical system is arranged electrically insulated from the vehicle body and has a rectifier unit. An energy coupling device is arranged electrically insulated at the vehicle body for supplying electric energy for the electrical system. The energy coupling device has a coil for wireless magnetic coupling of an energy source that is external to the motor vehicle and provides an alternating magnetic field, wherein the coil is connected to the rectifier unit of the electrical system. An antenna unit is arranged at the vehicle body and is electrically insulated with respect to the electrical system. A decoupling device electromagnetically decouples the coil from the antenna unit.