Electric Power Transmission Device Frequency Shift Control
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Solution Overview
Problem
Contactless power transmission systems face challenges in reducing ripple in output current due to frequency hopping, which can lead to battery failure and interference with external devices, and existing methods struggle to accurately control frequency characteristics.
Innovation Solution
An electric power transmission device that periodically shifts the frequency of a magnetic field to multiple predetermined values, using a drive signal generator to instruct power transmitters to shift frequencies differently at the same time point, thereby reducing ripple in the output current and minimizing leakage electromagnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency hopping is performed to suppress leakage electromagnetic field, then leakage electromagnetic field interference is reduced, but output current ripple increases causing battery failure risk
Solution Approach 1:
The patent divides the frequency hopping process into separate controllable segments for each power transmitter. Each transmitter independently adjusts its frequency according to instructed shift values, allowing granular control over the frequency characteristics of individual transmitters while maintaining overall frequency hopping benefits.
Solution Approach 2:
The patent dynamically changes the frequency parameter of each power transmitter by instructing different shift values to different transmitters. This parameter adjustment allows the system to optimize both leakage field suppression and output current stability by controlling how frequencies are shifted across the transmitter array.
2Object-affected harmful factors
If frequency hopping is performed to meet international standards, then leakage electromagnetic field suppression is achieved, but accurate control of frequency characteristics becomes difficult
Solution Approach 1:
The patent implements a feedback mechanism where the controller receives information about the actual frequency characteristics and adjusts the shift value instructions accordingly. This feedback loop enables accurate control of frequency characteristics while maintaining compliance with international standards for leakage electromagnetic field suppression.
Solution Approach 2:
The controller acts as an intermediary between the power transmitters and the frequency hopping process. It receives target frequency characteristics and translates them into specific shift value instructions for each transmitter, simplifying the control complexity by centralizing the frequency management function.
3Reliability
If multiple power transmitters operate at different frequencies simultaneously, then output current ripple is reduced, but coordination control complexity increases
Solution Approach 1:
The controller pre-calculates and determines the optimal shift values for each power transmitter before executing the frequency hopping sequence. This preliminary action ensures that multiple transmitters operate at different frequencies in a coordinated manner to reduce output current ripple, while avoiding the complexity of real-time coordination adjustments.
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 reduces ripple in the output current and minimizes leakage electromagnetic field interference, ensuring stable power transmission while adhering to international standards, thereby preventing battery failure and maintaining efficient energy transfer.
Implementation Method 1
a power transmission circuit generates high-frequency current of a predetermined frequency, the high-frequency current excites a power transmission coil, and a magnetic field generated by the excitation transmits electric power
Data Source
AI summary
One aspect of the present invention is an electric power transmission device that periodically shifts a frequency of a magnetic field to a plurality of predetermined shift values and that transmits electric power by utilizing the magnetic field. The device includes a plurality of power transmitters and an instructor. Each of the plurality of power transmitters configured to generate a magnetic field. The instructor outputs an instruction signal indicating a shift value to be shifted to each of the power transmitters to instruct the shift value to be shifted to each of the power transmitters. Further, the instructor instructs the shift value to be shifted in such a manner that at least a part of the magnetic fields of the plurality of power transmitters are different in frequency at the same time point.