Wireless Power Receiver Rectifier Control for Impedance Matching
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Solution Overview
Problem
Current wireless charging systems face inefficiencies in power transfer due to variations in load impedance and reactance, leading to reduced power delivery and increased heat dissipation, which complicates the management of power signal parameters and impedance matching.
Innovation Solution
The implementation of a wireless power transmission system that includes a power signal source with high-side and low-side modulators, a matching network with variable capacitors for reactance compensation, and phase-based current measurement, allowing for synchronous control of multiple power signal sources to maintain optimal power transfer and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wireless power transmission is performed without impedance matching compensation, then the system structure is simpler, but power transfer efficiency deteriorates due to load impedance variations
Solution Approach 1:
The patent implements dynamic reactance compensation by adjusting the matching network parameters in real-time based on load conditions. The system continuously monitors power transfer efficiency and adjusts the reactive components to maintain optimal impedance matching, transforming a static system into a dynamic one that adapts to changing load impedance, thereby resolving the contradiction between maintaining high efficiency and avoiding excessive complexity.
Solution Approach 2:
The patent employs feedback control mechanisms where the system monitors power transfer performance and uses this information to adjust the matching network parameters. The feedback loop detects efficiency degradation due to impedance mismatch and triggers compensatory adjustments, enabling the system to maintain optimal power transfer without requiring overly complex predetermined matching circuits for all possible load conditions.
2Power
If multiple power signal sources are used to increase power delivery, then power output is improved, but control complexity increases due to synchronization requirements
Solution Approach 1:
The patent combines multiple power signal sources into a unified transmission system with shared control architecture. By merging the control functions and using a common synchronization reference, the system achieves coordinated operation of multiple sources without requiring independent complex control circuits for each source, thus increasing power delivery while limiting the growth of control complexity.
Solution Approach 2:
The control system is designed with universal functions that can manage any number of power sources through a standardized interface and common synchronization protocol. This multi-functional control architecture allows the same control circuitry to handle single or multiple power sources, reducing the incremental complexity when scaling from one to multiple sources.
3Power
If high power transmission is performed without optimization, then power delivery capability is improved, but heat dissipation increases reducing safety
Solution Approach 1:
The patent optimizes operating parameters including voltage, current, and frequency to achieve high power transmission with minimized losses. By carefully selecting and adjusting these parameters, the system delivers high power while reducing resistive heating and other loss mechanisms, thereby resolving the contradiction between power delivery capability and heat generation.
Solution Approach 2:
The patent converts potential harmful effects into beneficial outcomes by using monitoring of heat-generating conditions to trigger adjustments in power transmission parameters. The system detects early signs of excessive heat dissipation and responds by optimizing impedance matching or adjusting operating parameters, thereby preventing harmful thermal effects while maintaining high power delivery capability.
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 enables efficient power transfer by adjusting voltage and phase angles to maintain constant peak current, reducing heat dissipation and improving power delivery while allowing for compact component design, thus enhancing the overall efficiency and safety of wireless charging systems.
Implementation Method 1
a matching network with variable capacitors for reactance compensation
Implementation Method 2
phase-based current measurement, allowing for synchronous control of multiple power signal sources
Data Source
AI summary
Aspects of the subject disclosure may include, for example, a wireless power receiver configured to receive a wireless power signal from a power transmitting unit. A wireless radio unit is configured to communicate with the power transmitting unit. A controllable rectifier circuit is configured to rectify the wireless power signal. The controllable rectifier circuit can include a rectifier configured to generate a rectified voltage from the wireless power signal, based on switch control signals. A rectifier control circuit is configured to generate the switch control signals and to generate first control data that indicates a first rectifier duty cycle of the switch control signals. The wireless radio unit sends the first control data to the power transmitting unit. Other embodiments are disclosed.