PWM Feedback Communication in Wireless Power Charging Control
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in communication between the transmission and reception apparatuses, particularly in high-power applications where traditional packet-based digital communication methods are slow and prone to delays.
Innovation Solution
The implementation of a pulse width modulation (PWM) communication technique that uses variable pulse widths to efficiently convey feedback parameters, such as control error values, directly in analog form, allowing for faster adaptation and control of wireless power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional packet-based digital communication methods are used for feedback transmission, then communication reliability is maintained, but communication speed and responsiveness deteriorate due to delays in high-power applications
Solution Approach 1:
The patent replaces traditional packet-based digital communication with pulse width modulation (PWM) analog communication. Instead of encoding feedback parameters into digital packets that require transmission, acknowledgment, and processing cycles, the system directly modulates the amplitude or frequency of the wireless power carrier signal with the feedback parameter information. This substitution of communication mechanism eliminates protocol overhead and significantly reduces communication latency in high-power wireless charging scenarios.
2Productivity
If PWM communication technique is implemented, then communication responsiveness and speed improve, but system complexity increases due to analog feedback processing
Solution Approach 1:
The patent merges the power transmission function with the communication function by modulating the wireless power carrier signal itself to carry feedback parameter information. Instead of using a separate communication channel or protocol stack, the feedback is embedded directly in the power transfer signal through PWM modulation. This consolidation eliminates the need for separate communication hardware and protocols, reducing overall system complexity despite the analog nature of the feedback.
3Ease of manufacture
If traditional digital packet communication is used, then ease of implementation is maintained, but communication delays cause inefficiencies in high-power applications
Solution Approach 1:
The patent changes the fundamental parameter of communication from digital packet-based protocols to analog pulse width modulation. By representing feedback parameters directly as PWM signal characteristics (pulse width, amplitude, or frequency), the system achieves real-time communication without the overhead of digital encoding, packet assembly, transmission, and decoding. This parameter transformation enables efficient high-power transmission by eliminating communication bottlenecks while maintaining implementation feasibility through standard PWM circuitry.
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 approach significantly reduces communication delays and improves responsiveness to changes in load or positioning, preventing faults and ensuring efficient high-power wireless charging.
Implementation Method 1
A wireless power transmission apparatus may include a primary coil that produces an electromagnetic field. The electromagnetic field may induce a voltage in a secondary coil of a wireless power reception apparatus when the secondary coil is placed in proximity to the primary coil.
Implementation Method 2
The implementation of a pulse width modulation (PWM) communication technique that uses variable pulse widths to efficiently convey feedback parameters, such as control error values, directly in analog form
Data Source
AI summary
This disclosure provides systems, methods and apparatuses for a new communication technique between a wireless power transmission apparatus and a wireless power reception apparatus. The new communication technique may be more efficient for communication of a feedback parameter or other control information compared to a legacy packet-based digital communication technique. The new communication technique may use a pulse width modulation (PWM) signal as an analog representation of a feedback parameter or other control information. In some implementations, the PWM communication technique in this disclosure can be used for a variety of control or feedback information from the wireless power reception apparatus to the wireless power transmission apparatus. Furthermore, in some implementations, the PWM communication technique may be used for feedforward information from the wireless power transmission apparatus to the wireless power reception apparatus.