Wireless Power Rectifier Control for Dynamic Boost Stability
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Solution Overview
Problem
Conventional wireless power transfer systems face inefficiencies due to discontinuous conduction mode and comparator chatter in dynamic boost mode, leading to degraded charging performance or prevention of charging altogether.
Innovation Solution
Implementing a dynamic boost with constant current mode (CCM) that forces high-side and low-side transistors to remain enabled for specific debounce times, preventing comparator chatter and ensuring continuous conduction, thereby maintaining a minimum threshold current in the coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic boost mode is implemented to improve wireless power transfer performance, then charging efficiency is improved, but discontinuous conduction mode and comparator chatter occur causing degraded charging performance
Solution Approach 1:
The patent implements constant current mode (CCM) that maintains continuous conduction by keeping the full-bridge rectifier actively controlled throughout the entire AC cycle. This prevents discontinuous conduction mode (DCM) by ensuring current flow continuity, thereby eliminating comparator chatter and improving charging performance stability while maintaining the efficiency benefits of dynamic boost mode.
2Use of energy by moving object
If transistors are dynamically switched to enable boost function, then power transfer efficiency is enhanced, but electromagnetic interference increases due to discontinuous conduction
Solution Approach 1:
By transitioning from dynamic boost mode with discontinuous conduction to constant current mode with continuous conduction, the patent maintains steady current flow through the rectifier and filter inductor. This continuous operation reduces electromagnetic interference while preserving the high efficiency benefits through active control of the full-bridge rectifier.
Solution Approach 2:
The patent changes the operating parameters of the rectifier by implementing active control of all four switching devices throughout the entire AC cycle, rather than passive rectification or dynamic boost mode. This parameter change maintains continuous current flow and reduces electromagnetic interference while sustaining high power transfer efficiency.
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 enhances wireless power transfer efficiency by preventing the rectifier from entering discontinuous conduction mode, reducing electromagnetic interference, and maintaining a stable charge, thus improving charging performance and preventing voltage droop.
Implementation Method 1
a first circuit configured to receive a first signal and generate a first input signal and a second input signal from the first signal, wherein the first signal is a wireless power signal
Implementation Method 2
a second circuit configured to rectify the input signal, wherein rectifying the input signal generates an output signal, wherein the output signal is a direct current signal
Data Source
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AI summary
A system and apparatuses for dynamic boost with constant current mode are provided. According a specific embodiment, the present invention provides an apparatus comprising a first circuit that receives a wireless power signal and generates alternating current signals, and a second circuit that rectifies the input signal to produce a direct current output. The second circuit, equipped with low-side and high-side transistors, dynamically boosts the output signal and is capable of entering a constant current mode, maintaining transistor activation for a specified duration.