Power Transmission Control Device Mode Switching and Foreign Object Detection
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Solution Overview
Problem
Existing non-contact power transmission systems face challenges in minimizing power consumption, ensuring safety and reliability, and providing user convenience, particularly in detecting foreign objects and managing battery charging efficiently.
Innovation Solution
A power transmission control device that allows switching between automatic and switch modes, incorporating an operation mode switch terminal, an operation trigger terminal, and a power-transmitting-side control circuit to manage power transmission based on user input and automatic detection, including ID authentication and foreign object detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-contact power transmission is performed continuously to ensure power supply, then power transmission reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The system performs power transmission periodically rather than continuously. The control device monitors whether a power receiving device is present and activates power transmission only when needed, creating a periodic on-demand transmission pattern that reduces overall power consumption while maintaining reliability when devices are actually present
Solution Approach 2:
The system uses the power receiving device itself to signal its presence and power needs through electromagnetic coupling. The control device detects the receiving device's status and automatically adjusts transmission accordingly, making the system self-regulating without requiring continuous active monitoring that would consume additional power
2Ease of operation
If power transmission is performed without detection to improve convenience, then ease of operation is improved, but safety deteriorates due to potential foreign object heating
Solution Approach 1:
The system performs foreign object detection before initiating full power transmission. The control device first checks the transmission area for foreign objects using the primary coil, and only after confirming safety does it proceed with power transmission, thus preventing harmful heating while maintaining convenience
Solution Approach 2:
The system continuously monitors the electromagnetic field during power transmission and provides feedback to the control device. When a foreign object is detected through changes in field characteristics, the system automatically adjusts or stops transmission to prevent heating, creating a closed-loop safety mechanism that maintains both convenience and safety
3Ease of operation
If automatic mode is used to improve convenience, then ease of operation is improved, but device complexity increases due to additional detection and control circuits
Solution Approach 1:
The control device performs multiple functions using the same hardware components. The primary coil is used both for foreign object detection and for power transmission, and the operation mode switch terminal serves both to select modes and to provide feedback about device state, reducing the need for separate dedicated circuits for each function
Solution Approach 2:
The system combines the detection and power transmission functions into a unified control process. The control device integrates foreign object detection, power transmission control, and mode switching into a single coordinated system that shares common hardware resources, thereby reducing overall device complexity despite providing automatic functionality
4Use of energy by moving object
If switch mode is used to reduce power consumption, then power consumption is reduced, but ease of operation deteriorates due to manual switch operation
Solution Approach 1:
The system dynamically adapts its operation mode based on detected conditions. The control device can switch between automatic and standby modes depending on whether a power receiving device is present, allowing the system to consume minimal power during standby while providing automatic operation when needed, thus balancing power consumption and ease of operation
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 enhances user convenience by allowing flexible mode selection, reduces power consumption, and improves safety and reliability by automatically detecting and responding to foreign objects and managing battery charging effectively.
Implementation Method 1
non-contact power transmission (contactless power transmission) that utilizes electromagnetic induction to enable power transmission without metal-to-metal contact
Data Source
AI summary
A power transmission control device used for a non-contact power transmission system includes an operation mode switching terminal that receives an operation mode switch control signal that switches a mode between an automatic mode and a switch mode, a power transmitting device starting normal power transmission in the automatic mode after installation of a power-receiving-side instrument that includes a power receiving device in an area in which power transmitted via non-contact power transmission can be received has been automatically detected, the normal power transmission supplying power to a load of the power-receiving-side instrument, and the power transmitting device starting the normal power transmission in the switch mode after an operation trigger switch has been turned ON, an operation trigger terminal that receives an operation trigger signal that occurs due to an operation of the operation trigger switch, and a power-transmitting-side control circuit that controls power transmission to the power receiving device and changes an operation mode of the power transmitting device based on the operation mode switch control signal.