Wireless Power Transmitter With Voltage Divider For Adaptive Resonance
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Solution Overview
Problem
Current wireless power transfer technologies face limitations in long-range charging with magnetic induction and have constraints due to complex circuits and fixed resonance frequencies in magnetic resonance methods.
Innovation Solution
A wireless power transmitting device with a rectifier, capacitors for voltage division, and DC-AC converters with half-bridge or full-bridge structures, allowing for adaptive resonance frequencies and voltage adjustment to accommodate different wireless power standards, enabling efficient power transmission across various receiver characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If magnetic induction method is used for wireless power transmission, then power transmission is achieved within a certain frequency range (110 kHz to 205 kHz), but long range wireless charging becomes difficult
Solution Approach 1:
The patent employs multiple transmitting resonators with different resonance frequencies (first resonator at one frequency, second resonator at another frequency) that can be dynamically selected or combined based on the charging distance and receiver requirements, enabling the system to adapt between short-range and long-range power transmission modes
Solution Approach 2:
The system changes the resonance frequency parameter by using different resonators (first transmitting resonator and second transmitting resonator with different resonance frequencies) to optimize power transmission for different ranges, transitioning from magnetic induction to magnetic resonance methods as needed
2Length of stationary object
If magnetic resonance method is used for wireless power transmission, then long range charging is enabled, but the circuit becomes complex and is limited to one fixed resonance frequency
Solution Approach 1:
The patent divides the wireless power transmission system into separate modules (first transmitting resonator and second transmitting resonator) that can be independently controlled and selected, simplifying the overall circuit architecture while providing multiple frequency options
Solution Approach 2:
The system achieves multi-functionality by incorporating both magnetic induction (short-range) and magnetic resonance (long-range) capabilities in a single wireless power transmission device, allowing it to serve multiple charging scenarios without requiring separate systems
3Power
If high voltage DC power is used directly for wireless power transmission, then power transmission capability is sufficient, but switching loss and stress increase
Solution Approach 1:
The patent transforms the voltage parameter by using a voltage divider circuit to divide the high voltage DC power into multiple lower voltage levels before feeding them to different transmitting resonators, reducing switching stress and loss while maintaining adequate power transmission capability
Solution Approach 2:
The voltage divider circuit acts as an intermediary between the high voltage DC power source and the transmitting resonators, providing buffered lower voltage levels that reduce the direct stress on switching components while still enabling effective power transmission
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 efficiency and miniaturization of wireless power transmission devices by allowing high-frequency switching with low-rated voltage, reducing switching loss and stress, and supporting multiple wireless power standards.
Implementation Method 1
a rectifier configured to rectify alternating current (AC) power
Implementation Method 2
a capacitor configured to store the rectified AC power as direct current (DC) power
Implementation Method 3
a voltage divider configured to divide a voltage of the DC power
Implementation Method 4
a first transmitting resonator configured to transmit power according to the first output voltage; and a second transmitting resonator configured to transmit power according to the second output voltage
Implementation Method 5
a magnetic induction method and a magnetic resonance method have both been developed
Data Source
AI summary
A wireless power transmitting device includes: a rectifier configured to rectify alternating current (AC) power; a capacitor configured to store the rectified AC power as direct current (DC) power; a voltage divider configured to divide a voltage of the DC power; and a wireless power transmitter configured to wirelessly transmit power using the voltage divided by the voltage divider.