Wireless Power Transmitter Adaptive Frequency Control
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Solution Overview
Problem
Current wireless power transfer technologies face limitations in increasing the transmission distance and degree of freedom in charging target positioning, which restricts their application in various devices such as smartphones, home appliances, and electric vehicles.
Innovation Solution
A wireless power transmitter system that includes a converter, a power transmitting coil, and a controller, which varies impedance and resonance frequency to detect the presence of a receiver and optimize power transmission by performing sensing operations and adjusting capacitance and inductance, allowing for adaptive frequency adjustment to maximize voltage gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If wireless power transfer technology is used, then power can be transmitted wirelessly to devices, but the transmission distance is limited
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the operating frequency of the power transmitter to match the resonance frequency of the receiver. This frequency tuning mechanism allows the system to maintain efficient power transfer over varying distances by optimizing the electromagnetic coupling parameters, thereby extending the effective transmission distance while minimizing energy loss.
Solution Approach 2:
The system implements dynamics through real-time frequency adjustment and adaptive impedance matching. The power transmitter continuously monitors the receiver presence and adjusts its operating parameters dynamically, allowing the transmission distance to be extended adaptively based on the actual coupling conditions between transmitter and receiver.
2Adaptability or versatility
If wireless power transfer technology is used, then charging can be performed, but the degree of freedom in charging target positioning is limited
Solution Approach 1:
The patent employs feedback mechanisms where the power transmitter detects the receiver's presence and characteristics through electromagnetic coupling measurements. Based on this feedback, the system adjusts its operating frequency and power level to maintain optimal charging conditions, thereby enabling flexible positioning while ensuring accurate receiver detection and reliable power transfer.
3Measurement precision
If the transmission control signal and resonance control signal are varied to detect receiver presence, then sensing accuracy is improved, but the system complexity increases
Solution Approach 1:
The controller in the patent performs multiple functions using a single integrated unit: it generates transmission control signals, generates resonance control signals, detects receiver presence, and adjusts operating parameters. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby improving detection accuracy while limiting the increase in overall system complexity.
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 enhances the wireless charging distance and flexibility in positioning, enabling efficient power transfer over a wider range and improving compatibility with diverse devices, including those previously unsuitable for wireless charging.
Implementation Method 1
a power transmitter including a power transmitting coil and configured to vary an impedance in response to a resonance control signal, and to receive the AC voltage to wirelessly transmit power
Implementation Method 2
a power transmitter including a power transmitting coil and configured to vary an impedance in response to a resonance control signal
Data Source
AI summary
A wireless power transmitter includes a converter configured to output an alternating current (AC) voltage in response to a transmission control signal; a power transmitter including a power transmitting coil and configured to vary an impedance in response to a resonance control signal, and to receive the AC voltage to wirelessly transmit power; and a controller configured to determine whether a wireless power receiver is present while varying the transmission control signal and the resonance control signal.