Primary Measuring Device for Inductive Power Calibration
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Solution Overview
Problem
Inductive charging systems face challenges in efficiently transmitting power while adhering to international electromagnetic wave emission standards, requiring precise alignment and harmonic filtering, and ensuring safe operation without excessive magnetic radiation.
Innovation Solution
A primary measuring device and method for calibrating measured values in the power transmission system, which includes an evaluation device for detecting current, voltage, and phase shift, and a calibration device to correct these values, providing accurate effective power measurement and ensuring safe operation by adjusting for phase shift and holding time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters are used to remove harmonics and ensure compliance with electromagnetic emission standards, then emission compliance is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by using the secondary circuit as a reference to automatically determine and correct phase shift deviations in the primary circuit, eliminating the need for external calibration equipment or manual adjustment mechanisms
Solution Approach 2:
The calibration method uses feedback from the secondary circuit's power consumption measurements to iteratively adjust and determine the optimal phase shift correction value, creating a closed-loop system that automatically optimizes itself
2Productivity
If precise alignment of coupling elements is required to achieve specific quality coupling, then power transmission efficiency is improved, but positioning system complexity increases
Solution Approach 1:
The system automatically determines the optimal phase shift correction value by using the secondary circuit as a reference during calibration, eliminating the need for manual positioning or complex positioning systems
Solution Approach 2:
The patent replaces mechanical alignment and positioning systems with an electrical calibration method that adjusts phase shift values to achieve optimal coupling, substituting physical adjustment with electrical parameter optimization
3Productivity
If power transmission occurs without communication feedback from the vehicle, then charging availability is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent introduces the secondary circuit as an intermediary reference that enables accurate calibration of the primary circuit's phase shift measurement without requiring direct communication feedback from the vehicle
Solution Approach 2:
The system uses the secondary circuit's known power consumption characteristics as a self-reference to automatically calibrate and correct measurement errors in the primary circuit, enabling accurate measurement without external feedback
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 enables effective power transmission within safety limits, ensuring compliance with emission standards and preventing uncontrolled magnetic field operation, even without communication feedback from the vehicle, by accurately measuring and correcting power values in real-time.
Implementation Method 1
A system for inductive power transmission can be used to electrically charge a purely electric vehicle (EV, electric vehicle) or a hybrid vehicle (PHEV, plug-in hybrid-electric vehicle) that is operated with a combination of fuel and electrical power, if charging should be done in a contactless manner. In such a system, an alternating magnetic field is generated in the frequency range of 25 kHz-150 kHz.
Implementation Method 2
Although a magnetic field is used in principle for power transmission, it is inherently an electromagnetic wave due to the fact that the magnetic field changes.
Data Source
AI summary
A measuring device for measuring current effective power in a circuit of a transmission system, including an evaluation device and a calibration device, the evaluation device having a connection for measuring current, voltage, and phase shift between the current and the voltage in the circuit, wherein the evaluation device and the calibration device are connected to one another, the evaluation device configured to measure power by evaluating measured current and measured voltage, the calibration device configured to correct the measured current and/or the measured voltage via a cos ( ) value of a measured phase shift between the measured current and the measured voltage and/or via a holding time, the evaluation device configured to calculate a power value with a corrected value of the measured current and/or a corrected value of the measured voltage, and the calibration device configured to make available the calculated power as the current effective power.