Measuring Transducer for Electric Vehicle Inductive Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in electric vehicle charging is accurately measuring electrical energy for billing purposes, particularly in inductive charging, where standard measurement technologies fail due to non-standard voltages and frequencies, leading to significant power loss in the transmission path.
Innovation Solution
A measuring transducer that converts alternating current from the inductive charging circuit into a standard frequency, allowing the use of existing standard measurement technology by tapping off an AC variable, scaling it, and ensuring phase alignment to accurately measure electrical power with minimal power loss, using a converter to adjust the frequency and magnitude of the alternating current to match standard measurement systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard measurement technology is used in AC charging circuits, then measurement reliability and availability are improved, but measurement accuracy deteriorates due to non-standard voltages and frequencies
Solution Approach 1:
The patent introduces an intermediary device (frequency converter/transducer) that converts non-standard AC frequencies to standard frequencies. This intermediary component enables standard measurement technology to accurately measure power in inductive charging circuits by translating the non-standard frequency signals into standard frequency signals that conventional meters can process accurately.
Solution Approach 2:
The patent changes the frequency parameter of the AC signal from non-standard values (e.g., 85-150 Hz in inductive charging) to standard values (50/60 Hz) using a frequency converter. This parameter transformation allows standard measurement technology to function accurately without requiring specialized equipment for each frequency range.
2Ease of operation
If inductive charging is used, then charging convenience is improved, but power loss increases due to transmission path losses
Solution Approach 1:
The patent replaces mechanical contact-based charging (plug-and-play connectors) with inductive charging using electromagnetic fields. This substitution eliminates physical wear, improves safety, and enables wireless power transfer, though it introduces transmission losses that are compensated by precise measurement and billing systems.
3Adaptability or versatility
If frequency conversion is implemented, then compatibility with standard measurement technology is improved, but device complexity increases
Solution Approach 1:
The frequency converter is designed to handle multiple non-standard frequencies (85-150 Hz range) and convert them all to standard frequencies (50/60 Hz). This multi-functional capability allows a single device to serve various inductive charging systems with different frequency specifications, reducing the need for multiple specialized converters.
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
Enables precise measurement of electrical power in the AC charging circuit, reducing power loss and allowing for accurate billing, while maintaining low power consumption in the measurement circuit, thus enhancing the efficiency and cost-effectiveness of the measurement process.
Implementation Method 1
an alternating electrical field is induced in the induction coil via an inductive coupling between a coil in a charging station and an induction coil in the electric vehicle
Implementation Method 2
the present measurement converter is proposed, which converts the measured alternating current quantity in the alternating current measurement circuit into at least one alternating current quantity at a standard frequency
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a measuring transducer for electric vehicles, comprising at least one tap designed for tapping at least one alternating-current measurement variable in an alternating-current charging circuit, a converter designed to convert a frequency of the alternating-current measurement variable into a standard frequency of a power supply network, and for outputting at least one alternating-current variable with the standard frequency in an alternating-current measurement circuit, and at least one standard meter arranged in the alternative-current measurement circuit for sensing an electrical power with the alternating-current variable at the standard frequency.