Signal Matching Circuit for Inductive Power Harmonic Control
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Solution Overview
Problem
Inductive charging systems for electric vehicles face interference and inefficiency due to electromagnetic wave emissions and harmonic interference, which affect energy transmission quality and compliance with international standards.
Innovation Solution
A signal matching apparatus and method that includes an antenna connection for receiving electromagnetic signals, an evaluation circuit for matching the amplitude and phase, and a damping device to manage high voltages and harmonics, ensuring efficient energy transmission while adhering to emission standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters are used to remove harmonics and comply with emission standards, then electromagnetic wave emission compliance is improved, but device complexity increases
Solution Approach 1:
The patent adjusts the resonance frequency of the filter device to match the fundamental oscillation frequency (25-150 kHz) of the inductive charging system. By changing the frequency parameter and tuning the filter to resonate at the desired frequency, the system achieves effective harmonic filtering while maintaining a relatively simple device structure. The resonance frequency adjustment allows the filter to naturally attenuate unwanted harmonics without requiring complex multi-stage filtering circuits.
2Reliability
If a positioning system is used to ensure proper orientation of coupling elements, then energy transmission quality is improved, but device complexity increases
Solution Approach 1:
The filter device serves multiple functions: it acts as both a harmonic filter and a resonance circuit that generates the alternating magnetic field required for inductive power transmission. This multi-functionality eliminates the need for separate positioning and field generation systems, reducing overall device complexity while maintaining reliable energy transmission. The resonant circuit inherently provides the necessary magnetic field when properly tuned, combining filtering and field generation in a single component.
3Productivity
If different transmission techniques are used for energy and positioning signals, then transmission effectiveness is improved, but interference between systems increases
Solution Approach 1:
The patent utilizes the electromagnetic waves generated by the resonant circuit for dual purposes: both energy transmission and positioning signal transmission. Instead of treating the electromagnetic field merely as a means for power transfer, the system benefits from using the same field for communication and positioning. The filter device, when tuned to resonance, naturally generates the alternating magnetic field that serves both functions, converting what could be considered interference into a useful resource for both power and signal transmission.
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 solution effectively transmits energy with minimal harmonic interference, maintaining high efficiency and compliance with international standards by matching the signal characteristics and using a damping device to manage high voltages, thereby ensuring precise positioning and safe operation.
Implementation Method 1
an antenna connection (403) for connecting a receiving antenna (302ax) and an evaluation connection (404) for connecting an evaluation circuit (402). The antenna connection (403) is configured to receive an electromagnetic signal (POS). The signal transmission device (420) is configured to leave a phase of the electromagnetic signal (POS) substantially unchanged and to match an amplitude of the electromagnetic signal (POS) to a characteristic prescribable by the evaluation circuit (402)
Implementation Method 2
In order to comply with these limit values for emission, it should be ensured that the alternating magnetic field used for the energy transmission works with a fundamental oscillation in the range 25 kHz . . . 150 kHz and contains only very few harmonics. Therefore, filters are used, which to the extent possible remove the interfering harmonics
Implementation Method 3
a damping device to manage high voltages and harmonics
Data Source
AI summary
A signal matching apparatus for an evaluation circuit for evaluating an electromagnetic signal for operation in an inductive energy transmission system, the apparatus including a signal transmission device, wherein the signal transmission device includes an antenna connection for connecting a receiving antenna, an evaluation connection for connecting the evaluation circuit for the electromagnetic signal, wherein the antenna connection is configured to receive the electromagnetic signal, wherein the signal transmission device is configured to leave the phase of the electromagnetic signal substantially unchanged and wherein the signal transmission device is configured to match the amplitude of the electromagnetic signal to a characteristic prescribable by the evaluation circuit, wherein the evaluation connection is configured to provide the electromagnetic signal to the evaluation circuit.