Insulated LC Resonance Circuit for Coil Misalignment Control
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Solution Overview
Problem
Non-contact charging systems for moving bodies like AGVs face inefficiencies due to changes in positional relationships between power transmission and receiving coils, leading to mismatched resonance frequencies and varying load conditions, which complicate circuit design and control, and require additional control circuits and communication systems.
Innovation Solution
An insulated resonance circuit device with first and second LC resonance circuits, a rectifier circuit, and a control circuit that compares oscillation signals to generate gate signals for controlling the rectifier circuit, allowing for independent control of output characteristics without the need for complex control mechanisms or communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-contact charging system is used with power transmission and receiving coils, then charging can be performed without physical contact, but the inductance changes when the positional relationship between coils changes, causing resonance frequency mismatch and efficiency degradation
Solution Approach 1:
The system uses the oscillation signal voltage detected from the power receiving coil itself to generate the reference signal for the phase difference calculation, eliminating the need for external communication systems. The power receiver device autonomously provides the reference signal needed for control, achieving self-service and resolving the contradiction by maintaining reliability without adding complex communication infrastructure.
Solution Approach 2:
The control circuit calculates the phase difference between the gate signal and the oscillation signal voltage, and uses this feedback to adjust the gate signal timing. This closed-loop feedback mechanism compensates for inductance changes and resonance frequency variations, maintaining efficient operation despite positional changes between coils.
2Reliability
If control circuits and communication systems are added to maintain output characteristics, then resonance frequency mismatch and efficiency issues can be addressed, but the device complexity and manufacturing cost increase
Solution Approach 1:
The reference signal generation function is merged with the power receiving coil's oscillation signal output. Instead of using a separate communication system to transmit reference signals, the invention combines the power reception function with the reference signal provision function, eliminating the need for additional communication hardware and reducing device complexity.
Solution Approach 2:
The oscillation signal from the power receiving coil serves dual purposes: it is both the power carrier signal and the reference signal for phase difference calculation. This multi-functionality eliminates the need for separate communication systems while maintaining the ability to control output characteristics, resolving the contradiction between reliability and device complexity.
3Reliability
If wireless communication systems are used for control, then output characteristics can be maintained, but communication delays or interruptions can occur and circuit size increases
Solution Approach 1:
The oscillation signal from the power receiving coil acts as an intermediary that carries both power and control reference information. By using this existing signal as the reference, the invention eliminates the need for separate communication channels, removing the source of communication delays and interruptions while maintaining reliable output control.
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 configuration simplifies the device and reduces manufacturing costs by eliminating the need for additional control circuits and communication systems, ensuring efficient output characteristics regardless of changes in inductance or load.
Implementation Method 1
a first resonance circuit including first and second LC resonance circuits electromagnetically coupled to each other and electrically insulated from each other, which oscillates at a predetermined first resonance frequency based on an input AC voltage and generates and outputs an oscillation signal voltage
Implementation Method 2
a second resonance circuit having a second resonance frequency substantially identical to the first resonance frequency, which resonates with the oscillation signal voltage to detect the oscillation signal voltage
Implementation Method 3
first and second LC resonance circuits electromagnetically coupled to each other
Implementation Method 4
a rectifier circuit including a plurality of switching elements, which switches the oscillation signal voltage according to a plurality of predetermined gate signals, and then smooths the oscillation signal voltage to output a predetermined DC voltage
Data Source
AI summary
In an insulated resonance circuit device, a first resonance circuit includes first and second LC resonance circuits electromagnetically coupled to each other and electrically insulated from each other, oscillates at a predetermined first resonance frequency based on an input AC voltage, and outputs an oscillation signal voltage. The second resonance circuit having a second resonance frequency substantially identical to the first resonance frequency resonates with the oscillation signal voltage to detect the oscillation signal voltage, and outputs the detected oscillation signal voltage. A control circuit compare the oscillation signal voltage from the second resonance circuit with a comparison signal voltage for obtaining a predetermined target output voltage and/or a predetermined target output current to generate and output gate signals for controlling a rectifier circuit.