Power Receiver Foreign Object Detection via Adaptive Current Control
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Solution Overview
Problem
Existing power systems fail to detect foreign objects effectively, leading to potential damage or rust in the power receiver side due to changes in equivalent resistance, which can cause overheating or electrolysis reactions when high current is supplied despite the presence of foreign objects like dust, moisture, or rust in the power transmission lines.
Innovation Solution
A method and system that adaptively adjust the current level supplied from the power supplier side to the receiver side by detecting voltage changes at the supplier transmission node, switching from high to low current when a foreign object is detected to prevent damage, using a foreign object detection and control circuit that includes a transmission voltage detection circuit and a pull-up circuit to manage the current level based on voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current is supplied from power supplier to power receiver, then power delivery efficiency is improved, but foreign objects may cause overheating or electrolysis reactions leading to damage or rust
Solution Approach 1:
The system performs preliminary detection of the power receiver side before supplying high current. By detecting voltage levels or resistance characteristics in advance, the system identifies whether a foreign object is present, and only then decides to supply high current, thereby preventing overheating and electrolysis damage before they can occur
Solution Approach 2:
The system continuously monitors the power delivery path and uses feedback signals to detect changes in resistance or voltage that indicate the presence of foreign objects. When foreign objects are detected, the system adjusts or stops current supply to prevent damage, while allowing high current flow when the path is clear
2Reliability
If foreign object detection is implemented by detecting equivalent resistance changes, then detection capability is improved, but system complexity increases due to additional detection circuits
Solution Approach 1:
The power supplier side is designed to perform multiple functions: it既可以 supply power to the receiver side,又可以 detect foreign objects by monitoring voltage or resistance characteristics. The same transmission path used for power delivery is also used for detection, eliminating the need for separate detection circuits and reducing overall system complexity
Solution Approach 2:
The system uses its own power transmission path and inherent electrical characteristics to detect foreign objects. By monitoring changes in voltage, current, or resistance during normal power delivery, the system performs self-diagnosis without requiring external detection equipment, thereby simplifying the overall system architecture
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
Effectively prevents damage or rusting at the power receiver side by reducing the current supply when a foreign object is detected, ensuring safe operation and compliance with transmission interface specifications by maintaining proper coupling and power delivery communication.
Implementation Method 1
determining whether a foreign object exists in the power receiver side by detecting a change of an equivalent resistance
Implementation Method 2
the equivalent resistance is changed. Hence, the present invention detects whether a foreign object or rust exists, by detecting a change of the equivalent resistance
Data Source
AI summary
A power system capable of detecting a foreign object, includes a power supplier side, a power receiver side, and a cable. The power supplier side includes a power converter, a foreign object detection and control circuit, and a pull-up circuit. The power converter supplies a supply voltage to the power receiver side according to a power supply control signal. The foreign object detection and control circuit generates the power supply control signal for controlling the power converter, and generates a foreign object detection and control signal according to a voltage at a supplier transmission node of the power supplier side, for determining whether a foreign object exists in the power receiver side. The pull-up circuit adjusts a level of a supply current which is supplied from the supplier transmission node to the power receiver side.