Wireless Power Resonance Switching for Overvoltage Control
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in power transfer due to varying configurations of resonance circuits based on the distance between the electronic device and the wireless power transmitter, leading to inconsistent power reception efficiency and potential overvoltage issues.
Innovation Solution
An electronic device with a resonance circuit that adjusts its connection settings based on the distance from the wireless power transmitter by using capacitors and switches controlled by a controller, switching between series and parallel configurations to optimize power transfer efficiency and prevent overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the resonance circuit uses a series configuration, then power transfer efficiency is improved at short distances, but overvoltage occurs at far distances
Solution Approach 1:
The patent implements dynamic switching between series and parallel resonance circuit configurations based on the detected distance from the wireless power transmitter. The controller adjusts the circuit topology in real-time to match operating conditions, achieving both high efficiency at short distances and overvoltage prevention at far distances
Solution Approach 2:
The patent changes the electrical parameters of the resonance circuit by switching between series and parallel configurations. This parameter change allows the circuit to adapt its impedance characteristics and voltage distribution according to the operating distance, resolving the contradiction between efficiency and overvoltage protection
2Loss of energy
If the resonance circuit uses a parallel configuration, then power transfer efficiency is improved at far distances, but efficiency decreases at short distances
Solution Approach 1:
The system dynamically selects the optimal resonance circuit configuration (series or parallel) based on the detected distance from the wireless power transmitter. This dynamic adaptation ensures high power reception efficiency across all distance ranges by using the appropriate circuit topology for each condition
3Device complexity
If the resonance circuit configuration is fixed, then device complexity is reduced, but power transfer efficiency becomes inconsistent
Solution Approach 1:
The patent introduces dynamic control of the resonance circuit configuration through switches controlled by a distance-detecting controller. This dynamic capability achieves consistent high power transfer efficiency across varying distances while maintaining relatively simple circuit implementation through modular switch-based reconfiguration
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
Enhances power transfer efficiency and minimizes heat generation while ensuring consistent power delivery regardless of distance, preventing overvoltage by dynamically adjusting the resonance circuit configuration.
Implementation Method 1
Wireless power transmission may be performed in a magnetic induction, magnetic resonance, and electromagnetic wave scheme
Implementation Method 2
The magnetic induction or magnetic resonance scheme is advantageous in charging electronic devices positioned within a relatively short distance from the wireless power transmitter
Implementation Method 3
a rectification circuit configured to rectify AC power provided from the resonance circuit to DC power
Implementation Method 4
a DC/DC converter configured to convert the DC power provided from the rectification circuit and output the converted DC power
Data Source
AI summary
An electronic device may include: a battery, a resonant circuit including a receiving coil, at least one capacitor and at least one switch, a rectifier circuit; a DC/DC converter, a charge control circuit; and a controller, wherein the controller may be configured to check the voltage outputted from the rectifier circuit, control the at least one switch so that the receiving coil and the at least one capacitor form a serial resonant circuit, if the voltage output from the rectifier circuit is greater than or equal to a threshold voltage, and control the at least one switch so that the receiving coil and the at least one capacitor form a parallel resonant circuit, if the voltage output from the rectifier circuit is less than the threshold voltage.