Non-contact Power Transmission Positioning via Weak Voltage
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Solution Overview
Problem
Existing non-contact power transmission systems for vehicle charging face inefficiencies due to inaccurate detection of the power reception unit's position relative to the power transmission unit, leading to suboptimal charging efficiency and discomfort for occupants.
Innovation Solution
A non-contact power transmission system that includes a vehicle with a control unit equipped with a voltage value detection unit, moving amount detection unit, and moving direction detection unit, allowing for accurate detection of the power reception unit's position relative to the power transmission unit using weak voltage values, moving amounts, and moving directions, optimizing positioning for maximum charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only distance detection based on power reception voltage is used, then the detection process is simple, but the positioning accuracy is insufficient leading to inverted display and discomfort for occupants
Solution Approach 1:
The patent combines multiple detection methods (power reception voltage detection, moving amount detection via sensors, and moving direction detection via gyroscopes/accelerometers) into a unified positioning system. This integration allows the system to cross-validate data from different sources, thereby improving positioning accuracy while avoiding the inverted display issue that occurs with voltage-based detection alone.
Solution Approach 2:
The patent introduces movement sensors and direction sensors as intermediary devices that detect vehicle movement and orientation independently of the power transmission system. These intermediaries provide additional data points that help resolve the ambiguity in position detection, preventing the inverted display problem while maintaining system simplicity.
2Device complexity
If positioning is terminated when power reception voltage exceeds threshold, then the control process is simple, but the charging efficiency is not optimal with power waste
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors both power reception voltage and vehicle movement data. Instead of simply terminating positioning when voltage exceeds a threshold, the system uses feedback from multiple sensors to determine when optimal positioning is achieved, ensuring maximum charging efficiency while preventing premature termination that would waste power.
Solution Approach 2:
The patent transitions from a static threshold-based control system to a dynamic control system that continuously adjusts positioning based on real-time feedback from voltage detection, movement sensors, and direction sensors. This dynamic approach allows the system to optimize charging efficiency by maintaining precise positioning throughout the charging process rather than relying on a single threshold crossing event.
3Use of energy by moving object
If weak power is used for positioning, then power consumption is reduced and EMI is suppressed, but positioning accuracy is insufficient for precise alignment
Solution Approach 1:
The patent segments the power transmission process into two distinct phases: a positioning phase using weak power with enhanced detection (multiple sensors) for low-power alignment, and a charging phase using full power for efficient energy transfer. This segmentation allows the system to achieve precise positioning with minimal power consumption during the alignment phase, then transition to high-efficiency charging once positioned.
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 system ensures accurate positioning of the power reception unit, enhancing charging efficiency and reducing occupant discomfort by accurately determining the relative position and optimizing the positioning process.
Implementation Method 1
a power transmission unit (21) configured to transmit a weak power Plpe, and a power reception unit (22) configured to receive the weak power without contact
Data Source
AI summary
In a non-contact power transmission system, the radial distance of a power reception coil relative to a power transmission coil is detected on the basis of the weak voltage value corresponding to the amount of weak power received by the power reception coil, and moreover the moving amount is detected on the basis of the change in level of the detected weak voltage value and furthermore, the moving direction is detected. Thus, the position (distance) of the power reception coil relative to the power transmission coil is detected.