Self-Oscillating H-Bridge Circuit for Wireless Power Transfer
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Solution Overview
Problem
Conventional wireless power transfer devices require a separate dedicated microcontroller to control switching states for optimal efficiency and cannot operate in both wireless power transmission and reception modes effectively.
Innovation Solution
An H-bridge circuitry arrangement that self-oscillates, eliminating the need for external control by using a feedback loop and resonance circuit to generate a self-oscillating alternating current for wireless power transmission and rectifying induced voltage for wireless power reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional wireless power transfer devices use an array of electrical switches/transistors with a separate dedicated microcontroller to control switching states, then optimal power transfer efficiency can be achieved, but device complexity increases due to additional controlling hardware
Solution Approach 1:
The H-bridge circuitry arrangement is configured to self-oscillate, eliminating the need for external microcontroller control. The circuit automatically generates the oscillating current needed for wireless power transfer through its own internal feedback mechanisms, making it self-sufficient and removing the complexity of separate controlling hardware while maintaining optimal efficiency
Solution Approach 2:
The patent combines the functions of the H-bridge circuitry, oscillator, and control logic into a single integrated self-oscillating unit. This merging of previously separate components (switching circuitry, microcontroller, and oscillation generation) into one unified system reduces overall device complexity while preserving the ability to achieve optimal power transfer efficiency
2Adaptability or versatility
If conventional wireless power transmission devices are designed for transmission mode, then they can provide wireless power transmission, but they are unable to operate in wireless power reception mode
Solution Approach 1:
The H-bridge circuitry arrangement is designed with universal functionality that allows it to operate in both wireless power transmission and reception modes. The same circuitry that generates oscillating current for transmission can also rectify induced voltage from received electromagnetic signals, enabling bidirectional operation without requiring separate dedicated circuits for each mode
Solution Approach 2:
The patent employs the same H-bridge circuitry arrangement for both transmission and reception functions, essentially inverting its role between modes. During transmission, it generates and emits electromagnetic energy; during reception, it receives and rectifies electromagnetic energy. This inversion approach allows dual-mode operation using identical hardware, reducing complexity compared to having separate systems for each mode
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
Enables efficient wireless power transfer and reception without the need for additional controlling hardware, allowing the same circuitry to function in both modes with high efficiency and reduced complexity.
Implementation Method 1
Some conventional devices may utilise an array of electrical switches/transistors to provide an alternating current through a coil to generate a wireless power transmission signal, e.g. time varying magnetic field
Implementation Method 2
to be received by a further coil of a receiving device to induce a voltage therein
Data Source
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Figure 3
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AI summary
Examples of the present disclosure relate to an apparatus and method for wireless power transfer. According to an example of the present disclosure, there is provided a means configured to provide wireless power transmission in a wireless power transmission mode, wherein the means comprises an H bridge circuitry arrangement configured such that, in use during the wireless power transmission mode, the H bridge circuitry arrangement self-oscillates.