Wireless Power Transfer Active Voltage Tuning Unit
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Solution Overview
Problem
Wireless power transfer systems face challenges in actively controlling output voltage without changing the operating frequency, leading to sudden voltage increases and drastic variations that can affect system components.
Innovation Solution
A wireless power transfer system with an active voltage tuning unit that controls the output voltage by adjusting impedance based on differences in resonant frequency, operating frequency, and phase angles, allowing for continuous regulation without decoupling the load or changing the operating frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the operating frequency of the power converter is changed to regulate output voltage, then the output voltage can be controlled, but the system complexity increases and the operating stability deteriorates due to frequency variations
Solution Approach 1:
The patent changes the impedance parameter of the power exchange coil instead of changing the operating frequency. By adjusting the impedance (through reactive power compensation or coil parameter modification), the output voltage is regulated while maintaining constant operating frequency, thus avoiding the complexity and stability issues associated with frequency variation
Solution Approach 2:
The patent implements a control system that monitors the output voltage and adjusts the impedance of the power exchange coil accordingly. This feedback mechanism enables automatic voltage regulation by detecting voltage deviations and modifying the coil impedance to compensate, maintaining stable output without frequency changes
2Adaptability or versatility
If the load is disconnected or varied, then the power transfer can be adapted, but the output voltage attains very high values in very short time causing voltage gain variations that affect system components
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the impedance control mechanism to counteract voltage spikes before they occur. When load variation is detected, the control system immediately adjusts the power exchange coil impedance to prevent voltage from rising to harmful levels, rather than reacting after the spike occurs
Solution Approach 2:
The control system continuously monitors output voltage and provides real-time feedback to adjust the impedance of the power exchange coil. This feedback loop detects load variations and voltage deviations, automatically modifying the impedance to maintain stable voltage output despite load changes
3Reliability
If contact-based power transfer is used, then reliable power connection is achieved, but environmental impact increases and safety measures become cumbersome
Solution Approach 1:
The patent replaces the mechanical contact-based power transfer system with a contactless magnetic coupling system. By using electromagnetic induction between primary and secondary coils, power is transferred without physical contact, eliminating the environmental impact and safety issues associated with exposed connectors and high-voltage contacts while maintaining reliable power transfer
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
The system effectively minimizes voltage gain variations, reducing stress on components and ensuring stable output voltage across electric loads without altering the operating frequency, thus protecting the system from voltage spikes.
Implementation Method 1
the contactless power transfer unit comprises at least a first power exchange coil and a second power exchange coil magnetically coupled to each other and operable at a resonant frequency
Implementation Method 2
operable at a resonant frequency
Data Source
AI summary
A wireless power transfer system is disclosed. The wireless power transfer system includes a first converting unit for converting a first DC voltage of an input power to a first AC voltage, a contactless power transfer unit for transmitting the input power having the first AC voltage, and a second converting unit for transmitting the power having a second DC voltage corresponding to the first AC voltage to an electric load. Additionally, the wireless power transfer system includes an active voltage tuning unit for controlling the second DC voltage based on a difference between the second DC voltage and a reference voltage and at least one among a difference between the resonant frequency and the constant operating frequency and a difference between a phase angle of the first AC voltage and a phase angle of an AC current.