Inductive Charging Plate Calibration for Accurate Energy Billing
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Solution Overview
Problem
Inductive charging systems face challenges in accurately measuring and billing energy transfer due to legal requirements for calibration, as existing methods struggle to account for measurement errors and consumer-induced losses, particularly in public charging stations.
Innovation Solution
A method and device for determining correction values and measurement errors in inductive charging systems, utilizing existing sensors in the primary-side charging plate to compensate for disturbances, and a measuring probe for standardized magnetic field measurements, ensuring compliance with calibration laws by accounting for consumer-induced losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing sensors in the primary-side charging plate are used for energy measurement, then device complexity is reduced, but measurement precision deteriorates due to measurement errors and consumer-induced losses
Solution Approach 1:
The patent applies preliminary action by determining correction values before actual energy measurement and billing operations. During a calibration phase, the system pre-calculates correction factors that account for measurement errors and consumer-induced losses, storing these values for subsequent use. This allows the system to compensate for inaccuracies without adding complex real-time correction mechanisms during actual charging operations.
Solution Approach 2:
The patent introduces an intermediary correction value that mediates between the raw sensor measurements and the final billed energy amount. The correction value acts as a compensating factor that adjusts the measured energy to account for systematic errors and consumer-induced losses, enabling accurate billing without requiring complex real-time measurement systems.
2Measurement precision
If complex laboratory equipment is used for calibration, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent implements self-service by enabling the primary-side charging plate to perform its own calibration and determine its own correction values using existing sensors and a simple measuring probe. The system uses built-in resources to conduct calibration measurements and calculate correction factors, eliminating the need for external complex laboratory equipment while maintaining measurement accuracy.
Solution Approach 2:
The patent uses a simplified measuring probe that copies or replicates the essential measurement function without requiring full laboratory-grade equipment. The probe creates a standardized measurement setup that allows the charging plate to determine correction values using basic components rather than complex laboratory instruments.
3Measurement precision
If correction values are determined for each primary-side charging plate, then measurement precision improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by determining individual correction values for each primary-side charging plate based on its specific characteristics and sensor performance. Rather than requiring all plates to meet stringent manufacturing precision standards, the system allows each plate to have its own customized correction factors that compensate for individual variations, enabling accurate measurement without uniform high manufacturing precision across all units.
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 accurate and cost-effective energy measurement and billing, meeting legal requirements by compensating for measurement errors and consumer-induced losses without the need for complex laboratory equipment, ensuring reliable and economically feasible energy distribution.
Implementation Method 1
an alternating magnetic field is generated in the frequency range of 25 . . . 150 kHz. It should be noted that outside this frequency band the limits for the emission of electromagnetic waves are defined by internationally valid standards. Although in principle a magnetic field is used to transfer energy, the fact that the magnetic field changes means that it is inherently an electromagnetic wave.
Implementation Method 2
The secondary-side is usually the consumer side, in particular, the customer of the energy supplier. On the secondary side, the alternating magnetic field is converted back into electrical energy in the form of direct current to charge the vehicle battery.
Data Source
AI summary
A compensation device and a method of determining a correction value in a primary-side charging plate during the measurement of energy for a secondary charging plate, the method including: selecting at least one component that has an error or loss in the primary-side charging plate, wherein the at least one component that has an error or loss is influenced by at least one error or loss selected from the group of errors consisting of a measurement error (PGA,err) with respect to a comparison value, an intrinsic loss (Pintr), and a measurement loss (PMVA,err) of the secondary charging plate; determining an overall correction factor of the respective measurement errors or losses of the at least one component that has an error or loss; determining an overall correction factor and writing the overall correction factor as a correction value to a storage unit of the primary-side charging plate.