Wireless Power Receiver Available Power Measurement
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Solution Overview
Problem
In resonant wireless power systems, the available power to a receiver device is influenced by its orientation and the state of other receiver coils, making it difficult for the system to assess and manage power transfer effectively, leading to potential overload and instability.
Innovation Solution
A resonant wireless power receiver with an electromagnetic resonator, matching network, and rectifier circuit that measures instantaneous available power through two-point measurements, allowing intelligent control of power draw to prevent overload and ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the receiver device draws power without assessing available power, then charging can be initiated, but the power system may collapse due to overload
Solution Approach 1:
The receiver device performs preliminary assessment of available power by measuring the voltage at its output terminal before initiating charging. This preliminary measurement allows the device to determine whether the power system can support the intended power draw, preventing overload conditions that would cause system collapse.
Solution Approach 2:
The receiver device continuously monitors the voltage at its output terminal to assess available power and uses this feedback to control the charging process. By comparing the measured voltage against threshold values, the device can adjust its power draw to maintain system stability while enabling charging when conditions are favorable.
2Productivity
If the receiver device uses high power to charge the battery, then charging speed increases, but the power system becomes unstable and collapses
Solution Approach 1:
The receiver device dynamically adjusts its power draw based on real-time measurements of available power. By continuously monitoring the output voltage and adapting the charging rate accordingly, the system can achieve high charging speeds when the power system can support it, while automatically reducing power consumption when the system approaches its capacity limits, thereby maintaining stability.
3Adaptability or versatility
If multiple receiver coils are present in the system, then power distribution flexibility increases, but the available power to each receiver becomes difficult to assess
Solution Approach 1:
Each receiver device independently measures the available power by monitoring the voltage at its own output terminal. This self-service approach allows each receiver to autonomously assess the power available to it without requiring complex centralized measurement systems, enabling accurate power assessment even in systems with multiple receivers and flexible power distribution.
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 the wireless power receiver to accurately assess and manage available power, preventing overload and ensuring a stable user experience by allowing intelligent control of power draw based on measured power levels.
Implementation Method 1
multiple receiver devices can simultaneously receive power from a single source through near-field magnetic coupling
Implementation Method 2
A rectifier circuit converts ac power from the electromagnetic resonator to dc power
Data Source
AI summary
A resonant wireless power receiver that includes an electromagnetic resonator having one or more inductive elements that are arranged to form a receiver coil and a network of passive components arranged to form a matching network. A rectifier circuit converts ac power from the electromagnetic resonator to dc power. An available-power indicator measures the rectified power to assess the instantaneous power available to the receiver.