Resonant Inverter Frequency Control for Wireless Power Coil Misalignment
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Solution Overview
Problem
Existing non-contact power supply systems for wireless conveyance vehicles face inefficiencies due to fluctuations in the positional relationship between power transmitting and receiving coils, requiring time-consuming communication to optimize operating frequencies.
Innovation Solution
A drive control apparatus for a composite resonance circuit, incorporating an inverter circuit, input current detector, and frequency controller, uses an extreme value search method to rapidly determine and set the optimal operating frequency based on detected input current, eliminating the need for DC-to-DC converters and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If communication between power transmission and reception is used to determine optimum operating frequency, then frequency optimization accuracy is improved, but communication time increases
Solution Approach 1:
The patent extracts the frequency optimization function from the communication-based control system and implements it locally using only transmission-side information. The operating frequency is determined by monitoring transmission current characteristics and detecting resonance conditions, eliminating the need for communication with the receiving apparatus while maintaining optimization accuracy.
Solution Approach 2:
The power transmission apparatus performs self-diagnosis and self-adjustment of operating frequency by monitoring its own transmission current. The system detects resonance frequency and optimizes power transfer efficiency autonomously without external communication, making the system self-sufficient in frequency control.
2Loss of energy
If communication-based frequency optimization is implemented, then power conversion efficiency is improved, but system complexity increases
Solution Approach 1:
The patent removes the communication subsystem from the frequency optimization process, keeping only the essential current detection and control functions. This simplifies the system architecture while maintaining the ability to achieve high power conversion efficiency through resonance frequency detection.
3Adaptability or versatility
If positional relationship fluctuation between coils is accommodated, then adaptability is improved, but frequency stability deteriorates
Solution Approach 1:
The patent implements dynamic frequency adjustment by continuously monitoring transmission current and adapting the operating frequency in real-time based on detected resonance conditions. This allows the system to accommodate positional fluctuations between coils while maintaining optimal power transfer efficiency through continuous frequency tracking.
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
This approach allows for faster optimization of operating frequencies, enhancing power conversion efficiency and reducing communication time, thereby improving the non-contact power supply system's performance.
Implementation Method 1
an inverter circuit (12) configured to drive the composite resonance circuit by converting input DC power into AC power by switching the DC power at a predetermined operating frequency
Implementation Method 2
a composite resonance circuit including a plurality of LC resonant circuits including inductances L of power transmitting and receiving coils electromagnetically coupled to each other
Implementation Method 3
LC resonant circuits including inductances L of power transmitting and receiving coils electromagnetically coupled to each other
Data Source
AI summary
A drive control apparatus is configured to drive and control a composite resonance circuit including LC resonant circuits including inductances L of power transmitting and receiving coils electromagnetically coupled to each other. The drive control apparatus includes: an inverter circuit configured to drive the composite resonance circuit by converting input DC power into AC power by switching the DC power at a predetermined operating frequency; an input current detector configured to detect an input current of the inverter circuit; and a frequency controller and driver configured to generate a drive signal of the inverter circuit while changing the operating frequency by using a predetermined extreme value search method to drive the inverter circuit, search for a resonance frequency of the composite resonance circuit based on the detected input current, and set the operating frequency based on the searched resonance frequency.