Wireless Power Receiver Communication Circuit
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in efficiently and reliably transferring communication information from the receiver to the transmitter, particularly at higher power levels, due to limitations in impedance modulation methods which require multiple capacitor-switch networks for varied impedance variations.
Innovation Solution
A communication apparatus in the receiver, comprising independently controlled first and second communication networks with capacitors and switches, connected to the rectifier inputs, allows for varying the impedance coupled to the receiver coil, thereby adjusting the operating parameters of the transmitter coil and enabling efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance modulation method is used for communication from receiver to transmitter, then communication information can be transferred by varying operating parameters, but multiple capacitor-switch networks are required to achieve varied impedance variations, increasing device complexity
Solution Approach 1:
The communication apparatus is divided into separate functional modules: a control signal generation unit that creates communication signals, and a parameter modulation unit that varies transmitter operating parameters in response to these signals. This segmentation allows complex communication functionality to be achieved through coordinated simple components rather than a complex monolithic structure.
Solution Approach 2:
A control signal acts as an intermediary between the receiver and transmitter. The receiver generates control signals that are transmitted to the transmitter, where they trigger parameter variations. This intermediary mechanism enables reliable communication without requiring direct complex impedance modulation circuits at both ends.
2Measurement precision
If more capacitor-switch networks are added to achieve varied impedance variations for better communication, then communication precision improves, but device complexity and power consumption increase
Solution Approach 1:
Instead of adding more capacitor-switch networks to increase impedance variation levels, the invention changes the approach by modulating transmitter operating parameters (such as switching frequency or duty cycle) in response to receiver-generated control signals. This parameter change strategy achieves precise communication control without increasing the complexity of the impedance modulation hardware.
3Power
If impedance modulation is used at higher power levels, then power transfer capability increases, but communication reliability deteriorates due to limitations in existing impedance modulation methods
Solution Approach 1:
Instead of having the receiver modulate its own impedance to communicate (which becomes unreliable at high power), the invention inverts the approach: the receiver generates control signals that instruct the transmitter to modulate its own operating parameters. This inversion of the communication mechanism maintains reliability at high power levels by moving the modulation function to the transmitter side where it can be more effectively implemented.
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
This solution allows for more precise and reliable communication by generating multiple impedance variations, enhancing the transfer of information from the receiver to the transmitter, even at higher power levels, without the need for additional capacitor-switch networks.
Implementation Method 1
a rectifier having a first input coupled to a first terminal of a receiver coil and a second input coupled to a second terminal of the receiver coil, wherein the rectifier is configured to convert an alternating current voltage into a direct current voltage
Implementation Method 2
The primary side transmitter is magnetically coupled to the secondary side receiver through a magnetic coupling. The magnetic coupling may be implemented as a loosely coupled transformer having a primary side coil formed in the primary side transmitter and a secondary side coil formed in the secondary side receiver.
Data Source
AI summary
An apparatus includes a rectifier having a first input coupled to a first terminal of a receiver coil and a second input coupled to a second terminal of the receiver coil, wherein the rectifier is configured to convert an alternating current voltage into a direct current voltage, a first communication network connected to the first input of the rectifier, and a second communication network connected to the second input of the rectifier, wherein the first communication network and the second communication network are controlled independently to adjust a gain of a wireless power transfer system.