Efficient Object Detection in Wireless Charging Systems
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Summary
Problems
Conventional object detection systems in wireless charging systems have limited sensitivity, especially in detecting high-resonant-frequency foreign objects and human bodies, and consume high power, leading to inefficiencies and potential overheating issues.
Innovation solutions
The system employs a dual-coil configuration with a digital synthesizer and resistive digital-to-analog converters to generate small signals across a wide frequency range, allowing for sensitive detection without activating the main transmit/receive inverter, thus reducing power consumption and improving measurement accuracy.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the main transmit inverter circuit is activated to provide power signals to the coil for object detection, then the detection capability is improved, but the power consumption increases and overheating issues occur
Why choose this principle:
The patent divides the detection function into two separate circuits: a main transmit inverter circuit for power transmission and a small signal generator circuit for detection. This segmentation allows the detection function to be performed independently with minimal power consumption, resolving the contradiction between detection sensitivity and power consumption.
Principle concept:
If the main transmit inverter circuit is activated to provide power signals to the coil for object detection, then the detection capability is improved, but the power consumption increases and overheating issues occur
Why choose this principle:
Instead of using the full power of the main transmit inverter for detection, the patent applies partial action by using a small signal generator that provides just enough signal strength for effective detection. This partial action achieves the detection goal while avoiding excessive power consumption and overheating.
Application Domain
Data Source
AI summary:
The system employs a dual-coil configuration with a digital synthesizer and resistive digital-to-analog converters to generate small signals across a wide frequency range, allowing for sensitive detection without activating the main transmit/receive inverter, thus reducing power consumption and improving measurement accuracy.
Abstract
Systems and methods for object detection are provided. The system includes at least a coil, a main transmit inverter circuit, and one or more circuits. The one or more circuits are configured to generate a small signal, provide the small signal to the coil, receive a response signal, compare the response signal with one or more reference signals, and detect an object according to the comparison. The object is detected without providing a signal from the main transmit/receive inverter circuit to the coil.