Power Transmission Control Device for Foreign Object Detection
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Solution Overview
Problem
Existing non-contact power transmission devices face challenges in minimizing power consumption, ensuring safety and reliability, and reducing size and cost, particularly in preventing unnecessary power transmission and detecting foreign objects during charging.
Innovation Solution
A power transmission control device that performs temporary power transmission for ID authentication and normal power transmission, using a power-transmission-side control circuit to manage power flow based on ID authentication information and induced voltage, and includes features for detecting foreign objects and full-charge notifications to prevent unnecessary power consumption and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-contact power transmission is performed continuously to ensure power supply, then power reception reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The system performs periodic authentication and power transmission cycles instead of continuous operation. The primary-side instrument transmits authentication signals at regular intervals, and power transmission is activated only when authentication succeeds, thereby reducing unnecessary power consumption while maintaining reliable power supply to the secondary-side instrument.
Solution Approach 2:
The system uses feedback mechanisms where the secondary-side instrument responds to authentication signals by transmitting its identification information back to the primary-side instrument. This feedback loop allows the primary-side instrument to determine whether to activate power transmission based on successful authentication, preventing unnecessary power consumption while ensuring power is supplied when needed.
2Ease of operation
If power transmission is performed without authentication to improve convenience, then ease of operation is improved, but safety and reliability deteriorate due to potential breakdowns from non-standard instruments
Solution Approach 1:
The system performs authentication as a preliminary action before activating power transmission. The primary-side instrument transmits authentication signals and verifies the secondary-side instrument's identification information before enabling power transmission, ensuring that only standardized and compatible instruments receive power, thereby preventing breakdowns while maintaining operational convenience.
Solution Approach 2:
The authentication signal acts as an intermediary mechanism between the primary-side and secondary-side instruments. This intermediary process verifies the compatibility and standardization of the secondary-side instrument before allowing direct power transmission, ensuring safety and reliability without compromising user convenience.
3Device complexity
If authentication processes are simplified to reduce device complexity, then device complexity is reduced, but measurement precision deteriorates in detecting foreign objects and verifying instrument identity
Solution Approach 1:
The authentication signal serves multiple functions simultaneously: it authenticates the secondary-side instrument's identity, detects the presence of foreign objects, and verifies instrument compatibility. By making the authentication signal multi-functional, the system maintains high detection precision without adding separate detection mechanisms, thereby avoiding increased device complexity.
Solution Approach 2:
The system merges authentication, foreign object detection, and instrument verification into a single integrated process. The primary-side instrument uses the same authentication signal to accomplish multiple detection tasks, combining several functions into one unified mechanism, which reduces device complexity while maintaining precise detection capabilities.
4Reliability
If multiple authentication and detection functions are added to improve safety, then reliability is improved, but device complexity increases
Solution Approach 1:
The authentication signal is designed to perform multiple safety functions simultaneously: verifying instrument identity, detecting foreign objects, and confirming proper placement. By making this single signal multi-functional, the system achieves high reliability through comprehensive safety checks without requiring separate dedicated circuits for each function, thereby minimizing device complexity.
Solution Approach 2:
The secondary-side instrument provides its own identification information in response to the authentication signal, enabling the primary-side instrument to perform verification and detection functions using information supplied by the secondary-side instrument itself. This self-service approach reduces the need for complex active sensing components in the primary-side instrument while maintaining high safety standards.
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 effectively reduces power consumption, enhances safety and reliability by preventing unnecessary power transmission and detecting foreign objects, while maintaining convenience and reducing the size and cost of the power transmission device.
Implementation Method 1
non-contact power transmission from the power transmission device to the power reception device through a primary coil and a secondary coil that are electromagnetically coupled
Implementation Method 2
a power-transmission-side control circuit that controls power transmission to the power reception device based on an induced voltage in the primary coil
Data Source
AI summary
A power-transmission-side control circuit causes a power transmission device to perform temporary power transmission when a switch provided in a power-transmission-side instrument has been turned ON, and performs ID authentication based on ID authentication information. The power-transmission-side control circuit detects the presence or absence of a foreign object during normal power transmission by monitoring a change in induced voltage in a primary coil, causes the power transmission device to stop temporary power transmission when the ID authentication information from the power reception device has not been received within a given period of time, causes the power transmission device to stop temporary power transmission when the ID authentication has failed, and causes the power transmission device to stop normal power transmission when removal, a metal foreign object, a takeover state, or a full-charge state has been detected after normal power transmission has started.