Open Loop Tuning for Wireless Charging Efficiency
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Solution Overview
Problem
Conventional wireless charging systems for electric toothbrushes cannot optimize charging efficiency as they lack the ability to adjust transmitter power during charging, leading to energy wastage, heat discharge, and potential electromagnetic radiation risks.
Innovation Solution
An open-loop tuning method and system that uses a resonant circuit, boost converter, sensing circuit, and controller to detect input voltage and current, comparing them to stored information to adjust the input voltage without feedback from the power receiver, optimizing charging efficiency for different receiver locations and charging stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional wireless charging systems are used without power tuning capability, then the system structure is simple and manufacturing cost is low, but charging efficiency is not optimized leading to energy wastage and heat discharge
Solution Approach 1:
The system uses the existing input voltage and current sensing circuits to detect charging parameters, and the controller automatically adjusts the boost converter duty cycle based on detected parameters without requiring external feedback or additional sensing components. The system serves itself by utilizing already-present components for optimization purposes.
Solution Approach 2:
The controller dynamically changes the operating parameters (duty cycle) of the boost converter based on the detected input voltage and current levels. By adjusting the duty cycle parameter in response to changing charging conditions, the system optimizes power transfer efficiency without adding complex feedback infrastructure.
2Loss of energy
If transmitter power is not adjusted during charging process, then the control system is simple, but energy wastage occurs when battery is fully charged or brush is moved
Solution Approach 1:
The system transitions from static fixed power transmission to dynamic adaptive power tuning. The controller continuously monitors input voltage and current parameters and dynamically adjusts the boost converter duty cycle in real-time based on charging stage and receiver position, enabling the system to adapt to changing conditions without complex feedback loops.
Solution Approach 2:
The system performs preliminary detection of input voltage and current parameters before adjusting power transmission. By detecting charging parameters in advance and pre-adjusting the duty cycle based on detected conditions, the system prevents energy wastage before it occurs rather than reacting after the fact.
3Ease of manufacture
If no feedback communication from power receiver is implemented, then manufacturing cost is reduced and positioning freedom is improved, but charging efficiency optimization is limited
Solution Approach 1:
The system extracts and utilizes the input voltage and current sensing capabilities that already exist in the transmitter circuitry. By taking out and repurposing these existing sensing functions for optimization purposes, the system achieves efficiency improvement without requiring additional feedback components or communication infrastructure from the receiver side.
Solution Approach 2:
The transmitter system performs self-optimization by using its own internal sensing circuits to detect charging parameters and automatically adjusting its output. The system serves itself without needing external feedback, eliminating the need for costly feedback communication hardware while maintaining optimization 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 enhances charging efficiency, reduces energy wastage, and minimizes electromagnetic radiation, while allowing for adaptive tuning without the need for feedback communication, thus reducing manufacturing costs and supporting free positioning of the toothbrush.
Implementation Method 1
energy is transferred from a power transmitter to one or multiple power receivers, via a pair of coupled magnetic coils, one disposed in the transmitter and the other in the receiver
Implementation Method 2
a resonant circuit configured to wirelessly couple to the one or more electric devices
Data Source
AI summary
An apparatus for charging one or more electric devices. The device may comprise a resonant circuit configured to wirelessly couple to the one or more electric devices, a boost converter configured to convert a system voltage received by the apparatus to an input voltage of a power amplifier that drives the resonant circuit, a sensing circuit configured to detect the input voltage and an associated input current, and a controller. The controller may be configured to receive the detected input voltage and the detected input current, compare the received input voltage and the received input current with stored voltage and current information, identify a difference between the received input voltage and a predetermined voltage according to the stored voltage and current information, and control the boost converter to adjust the input voltage by the identified difference to the predetermined voltage. The adjustment may not need any feedback or communication from the power receiver unit.