Wireless Power Receiver Load Resistance Control
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Solution Overview
Problem
Existing wireless power transfer methods require communication between transmitting and receiving apparatuses and struggle to maintain maximum efficiency with changing loads and limited inductance, especially over short distances.
Innovation Solution
A wireless power receiving apparatus with a controller that adjusts the effective load resistance by identifying optimal rectified phases and voltages based on parasitic resistances, inductances, and coupling coefficients, allowing for maximum efficiency without the need for additional communication devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If communication is used between transmitting and receiving apparatuses to control transmission power, then power transfer efficiency can be optimized, but device complexity increases due to additional communication devices
Solution Approach 1:
The wireless power receiving apparatus independently determines its effective load resistance and controls its rectifier without requiring communication with the transmitting apparatus. The receiving apparatus uses its own controller to identify optimal rectified phases and adjust effective load resistance, making the system self-sufficient and eliminating the need for additional communication devices while maintaining maximum power transfer efficiency.
Solution Approach 2:
The invention extracts the communication function from the power transfer control process. By having the receiving apparatus independently control its own effective load resistance and rectifier operation, the communication component is removed entirely from the system, simplifying the device while preserving efficiency optimization capabilities.
2Loss of energy
If DC/DC converter characteristics are controlled to maintain maximum efficiency, then power transfer efficiency is improved, but the DC/DC converter requires stable operation which conflicts with characteristic control
Solution Approach 1:
The invention changes the control parameter from DC/DC converter characteristics to effective load resistance. By controlling the effective load resistance through rectifier phase adjustment rather than modifying DC/DC converter characteristics, the system achieves maximum power transfer efficiency while allowing the DC/DC converter to operate stably without conflicting control requirements.
Solution Approach 2:
The invention introduces dynamic control of the rectifier's effective load resistance that can adapt to changing operating conditions. The controller dynamically identifies optimal rectified phases and adjusts the effective load resistance in real-time, enabling the system to maintain maximum efficiency across varying loads and distances without compromising DC/DC converter stability.
3Loss of energy
If resonator inductance is increased to improve coupling, then power transfer efficiency improves, but device size and complexity increase
Solution Approach 1:
The invention changes the control approach from modifying physical resonator parameters (inductance, size) to controlling electrical parameters (effective load resistance, rectified phase). By adjusting the effective load resistance through phase control of the rectifier, the system achieves optimal power transfer efficiency without increasing resonator size or inductance, maintaining compact device dimensions.
4Adaptability or versatility
If communication is implemented for load information exchange, then power transfer can be optimized for changing loads, but the system complexity and cost increase
Solution Approach 1:
The receiving apparatus independently monitors its own load conditions and effectively communicates this information to the transmitting apparatus through its controlled effective load resistance. The controller identifies the load voltage and current, determines the effective load resistance, and uses this information to control the rectifier phase, enabling load adaptation without separate communication channels or additional communication devices.
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 enables optimal wireless power transfer efficiency despite limited inductance and changing loads, maintaining maximum efficiency over short distances without requiring communication between the wireless power transmitting and receiving apparatuses.
Implementation Method 1
a rectifier configured to generate a rectified voltage based on a magnetic field generated in a wireless power transmitting apparatus
Data Source
AI summary
Disclosed is a wireless power receiving apparatus capable of controlling an effective load resistance. The wireless power receiving apparatus may include a rectifier configured to generate a rectified voltage based on a magnetic field generated in a wireless power transmitting apparatus, and a controller configured to transmit, to the rectifier, a control signal for controlling a rectified phase of the rectifier to adjust an effective load resistance of the wireless power receiving apparatus.