Contactless Power Transfer Control Using Terminal Voltage Characterization
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Solution Overview
Problem
Existing power transmission systems struggle to perform optimal power control regardless of the combination and mutual positional relationship between power transmission and reception devices.
Innovation Solution
A power transmission device and reception device system that includes control units to acquire characteristic information based on the time-series transition of terminal voltage before power feeding control, allowing for optimal power transmission control by adjusting supply power based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional power transmission control is used without considering device combinations and positional relationships, then the control system remains simple, but optimal power transmission control cannot be achieved across different device configurations
Solution Approach 1:
The system performs preliminary identification of device combinations and positional relationships before executing power transmission control. By acquiring characteristic information about the power reception device and determining the device combination type in advance, the control system can select appropriate control parameters and strategies, enabling optimal power transmission across different configurations without requiring a overly complex control architecture.
Solution Approach 2:
The control system dynamically adjusts control parameters based on the identified device combination and positional relationship. By changing parameters such as transmission power levels, frequency, and control strategy according to the specific configuration detected, the system achieves adaptability to different device combinations while maintaining a relatively simple base control structure.
2Reliability
If characteristic information acquisition and analysis are performed before power transmission control, then optimal power transmission control is achieved, but the control process becomes more complex and time-consuming
Solution Approach 1:
Characteristic information about the power reception device is acquired and analyzed before power transmission control begins. This preliminary action includes identifying device type, capacity, and positional relationship, which enables the system to establish optimal control parameters in advance, ensuring reliable power transmission while minimizing setup time through pre-characterization.
Solution Approach 2:
The power reception device automatically provides characteristic information about itself to the power transmission device. This self-service mechanism eliminates the need for complex manual configuration or extensive probing, allowing the system to quickly acquire necessary information and proceed with optimal control, thereby reducing setup time while maintaining reliability.
3Ease of manufacture
If generic power transmission control is used without device-specific optimization, then the control system remains simple and fast, but manufacturing costs and operational loads cannot be optimized
Solution Approach 1:
The control system implements device-specific optimization by adjusting control parameters based on the identified power reception device characteristics and combination type. This allows the system to optimize manufacturing costs and operational loads for different device configurations while maintaining a relatively simple control algorithm structure that adapts through parameter modification rather than requiring completely different control logic for each device type.
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
Enables optimal power transmission control regardless of device combinations and positional relationships, reducing manufacturing costs and operational loads by deriving transfer function characteristics.
Implementation Method 1
power transmission unit configured to transmit power to a power reception device by contactless power transmission
Implementation Method 2
power reception unit configured to receive power transmitted from a power transmission device by contactless power transmission
Data Source
AI summary
A power transmission device includes a power transmission unit which transmits power to a power reception device by contactless power transmission, a power conversion unit which generates supply power using power of a first power supply unit and supplies the supply power to the power transmission unit, and a control unit which acquires information about a terminal voltage of a second power supply unit charged with power received by the power reception device and control the power conversion unit. The control unit executes power feeding control for controlling the supply power via the power conversion unit. Before the power feeding control is executed, power is transmitted to the power reception device, and the control unit acquires characteristic information of a system that charges the second power supply unit. The control unit thereafter controls the supply power during the power feeding control based on the acquired characteristic information.