Wireless Power Transmission System with Pre-calculated Control Parameters
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Solution Overview
Problem
Conventional wireless power transmission systems require a long time to activate a load when switching between different power receiving devices, due to the need for feedback control to adjust the voltage and frequency, which reduces work efficiency.
Innovation Solution
The system includes a power transmitting device that acquires control information from the power receiving device, including coupling coefficient, requested voltage, and load impedance, and adjusts the inverter circuit parameters to quickly activate the load by transmitting preliminary AC power, thereby reducing the activation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is used to adjust voltage and frequency when switching power receiving devices, then voltage stability is improved, but activation time increases
Solution Approach 1:
The system performs preliminary actions by storing control parameters (voltage, frequency, impedance values) in memory before actual power transmission begins. When a power receiving device is connected, the controller retrieves pre-calculated parameters from the table in memory, eliminating the need for time-consuming real-time feedback control calculations and enabling immediate voltage adjustment.
Solution Approach 2:
The system prepares control parameter tables in advance that contain pre-calculated voltage, frequency, and impedance values for various operating conditions. This beforehand cushioning of control data allows the system to quickly adapt to different power receiving devices without requiring prolonged feedback control, thus reducing activation time while maintaining voltage stability.
2Measurement precision
If real-time feedback control is implemented, then power transmission accuracy is improved, but system complexity increases
Solution Approach 1:
The controller pre-calculates and stores optimal control parameters (voltage, frequency, impedance) in a table in memory based on device specifications. This preliminary preparation of control data eliminates the need for complex real-time iterative calculations, maintaining power transmission accuracy while simplifying the control system architecture.
Solution Approach 2:
The system uses a table containing copied control parameters from pre-calculated data. Instead of performing complex real-time feedback control calculations, the controller retrieves pre-stored parameter sets that represent optimal control values, thereby maintaining accuracy while reducing computational 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 approach significantly reduces the activation time of the load after switching power receiving devices, improving work efficiency by eliminating the need for prolonged feedback control.
Implementation Method 1
an inverter circuit that converts a first DC power supplied from a power source into AC power and outputs the AC power
Implementation Method 2
a power transmitting antenna that wirelessly transmits the output AC power
Implementation Method 3
a power receiving antenna that receives the AC power transmitted from the power transmitting antenna
Implementation Method 4
a rectifying circuit that converts the received AC power into a second DC power
Data Source
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AI summary
A wireless power transmission system includes a power transmitting device, power receiving device, and load. The power transmitting device includes an inverter circuit, power transmitting antenna, power transmission control circuit, and transmitting-side receiver. The power receiving device includes a power receiving antenna, rectifying circuit, and receiving-side transmitter. The power transmission control circuit causes the inverter circuit to output preliminary AC power to activate the power receiving device. The receiving-side transmitter transmits, to the power transmitting device, control information of the power receiving device including (i) a coupling coefficient between the power transmitting antenna and the power receiving antenna, (ii) requested voltage of the power receiving device, and (iii) load impedance of the load. The power transmission control circuit determines the control parameter based on the control information by referring to the table, based on the control information, and adjusts the voltage and frequency of the AC power output from the inverter circuit using the control parameter.