Wireless Power Transmitter Circuit for Receiver and Foreign Object Detection
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Solution Overview
Problem
Conventional wireless power transmission systems require additional detection winding circuitries to differentiate between a wireless power receiver and a foreign object, leading to inefficiencies and increased complexity.
Innovation Solution
A wireless power transmitter circuit utilizing an inverter circuit, resonant transmitter circuit, and transmitter controller circuit to generate PWM control signals, allowing detection of a wireless power receiver and foreign objects based on transmission signal peaks and frequency variations without auxiliary detection windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional detection winding circuitries are added to differentiate between receiver and foreign object, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The transmission winding circuitry performs dual functions: both power transmission and foreign object/receiver detection. By making the transmission winding multi-functional, the patent eliminates the need for separate detection winding circuitries while maintaining detection accuracy through analysis of transmission signal characteristics.
Solution Approach 2:
The patent merges the detection function with the transmission function by using the same transmission winding circuitry for both purposes. The transmitter controller circuit analyzes transmission signals to detect both receivers and foreign objects, combining what were previously separate functions into one integrated system.
2Measurement precision
If additional detection winding circuitries are added to differentiate between receiver and foreign object, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The transmission winding circuitry performs dual functions: both power transmission and foreign object/receiver detection. By making the transmission winding multi-functional, the patent eliminates the need for separate detection winding circuitries while maintaining detection accuracy through analysis of transmission signal characteristics.
Solution Approach 2:
The transmission signal itself is used for detection purposes without requiring additional dedicated detection circuitry. The transmitter controller analyzes characteristics of the transmission signal to detect receivers and foreign objects, allowing the system to detect objects using its own operational signals rather than requiring separate detection resources.
3Difficulty of detecting and measuring
If natural response attenuation rate measurement is used to detect receiver and foreign object, then detection capability is achieved, but additional detection circuitries are required
Solution Approach 1:
The patent merges the detection function with the transmission function by using the same transmission winding circuitry for both purposes. The transmitter controller analyzes transmission signals to detect both receivers and foreign objects, combining what were previously separate functions into one integrated system.
Solution Approach 2:
The transmission signal serves as an intermediary that carries information about both power transmission status and the presence of receivers or foreign objects. By analyzing characteristics of this intermediate signal, the system can detect objects without requiring separate detection circuitries.
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 accurate detection of wireless power receivers and foreign objects using simplified circuitry, reducing power consumption and eliminating the need for additional detection windings while maintaining precision.
Implementation Method 1
a resonant transmitter circuit, wherein the resonant a transmitter circuit includes: transmission winding and a resonant capacitor which are coupled to each other
Implementation Method 2
generating a wireless transmission power via the resonant transmitter circuit
Implementation Method 3
an inverter circuit which includes a plurality of switches, wherein the inverter circuit is coupled to a resonant transmitter circuit, wherein the transmitter controller circuit is configured to operably generate a pulse width modulation (PWM) control signal, so as to control the plurality of switches
Implementation Method 4
measuring a peak of the transmission signal corresponding to the wireless test power
Implementation Method 5
determining whether the foreign object is present and/or whether the wireless power receiver circuit is present according to a transmission signal, wherein the transmission signal is related to a voltage in between the resonant capacitor and the transmission winding
Data Source
AI summary
A wireless power transmitter circuit includes: an inverter circuit including plural switches coupled to a resonant transmitter circuit; and a transmitter controller circuit for generating a PWM control signal, to control the plural switches, thus generating a wireless transmission power via the resonant transmitter circuit in a power supply procedure, so that a wireless power supply is accordingly provided to a wireless power receiver circuit. In a groping procedure, transmitter controller circuit controls the plural switches to generate a wireless test power via the resonant transmitter circuit based on an operation frequency. The groping procedure includes: measuring a peak of a transmission signal corresponding to the wireless test power; determining, according to the peak of the transmission signal, whether a foreign object exists and/or whether the wireless power receiver circuit is present. When it is determined that the wireless power receiver circuit is present, the power supply procedure is performed.