Wireless Power Receiver Feedforward Control for Fast MPPT
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Solution Overview
Problem
In wireless power transfer, implementing maximum power point tracking (MPPT) algorithms is challenging due to switching and conduction losses, especially in dynamic environments, where measuring load current is complicated and power transfer efficiency is hard to maintain.
Innovation Solution
A receiver circuitry with a power receiver, converter circuit, and control unit that uses feedforward control based on a measurement signal representing available power, allowing for efficient power transfer without needing to measure load current, and enabling quick adaptation to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If MPPT algorithm is implemented for maximum power transfer, then power transfer efficiency is improved, but measurement complexity and power consumption increase
Solution Approach 1:
The patent extracts the essential information needed for MPPT by measuring only the AC input signal characteristics (voltage, frequency, power level) rather than requiring complex load current measurements. The detector unit extracts power level information directly from the received wireless power signal, eliminating the need for complicated current sensing circuits and simplifying the overall measurement system while maintaining effective maximum power point tracking.
2Loss of energy
If MPPT algorithm is used for impedance matching, then power transfer efficiency is improved, but response speed decreases
Solution Approach 1:
The patent implements preliminary action by continuously monitoring the AC input signal characteristics and pre-adjusting the converter circuit parameters based on detected power levels. The control unit proactively modifies operating parameters before power transfer conditions change significantly, allowing the system to maintain optimal efficiency without requiring slow iterative MPPT algorithms. This proactive approach enables fast adaptation to varying wireless power transfer conditions.
3Loss of energy
If load current measurement is performed for power estimation, then MPPT control is achieved, but power consumption increases
Solution Approach 1:
The patent applies self-service by having the detector unit derive all necessary power estimation information directly from the AC input signal itself without requiring additional active measurement circuits. The system uses the incoming power signal's own characteristics (voltage, frequency, envelope) to determine power level, eliminating the need for separate current measurement circuits and their associated power consumption. This self-sufficient approach minimizes energy usage while maintaining effective power transfer optimization.
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
Ensures efficient power transfer in dynamic environments by controlling impedance matching and reducing power losses, maintaining high efficiency even in varying conditions without the need for complex load current measurements.
Implementation Method 1
a power receiver configured to receive a power signal from a wireless power transmitter and generate an alternating current, AC, input signal
Data Source
AI summary
A receiver circuitry for receiving power through wireless power transfer comprises: a power receiver configured to receive a power signal from a wireless power transmitter and generate an alternating current, AC, input signal (VAC); a converter circuit configured to receive the AC input signal (VAC) and to convert the AC input signal (VAC) to a direct current, DC, output signal (VOUT); a control unit configured to control at least one parameter of the converter circuit for controlling efficiency of power transfer; a detector configured to generate a measurement signal (Vpeak) representing available power of the AC input signal (VAC); wherein the control unit is configured to receive the measurement signal from the detector and to control the at least one parameter based on the measurement signal for feedforward control of the at least one parameter.