Wireless Power Rectifier Control to Prevent Comparator Chatter
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Solution Overview
Problem
Conventional wireless power transfer methods experience inefficiencies and electromagnetic interference due to discontinuous conduction mode and comparator chatter in dynamic boost rectifier modes, leading to poor charging performance.
Innovation Solution
Implementing dynamic boost with constant current mode (CCM) to prevent the rectifier from entering discontinuous conduction mode, eliminating comparator chatter by ensuring comparator inputs have fully settled before responding, and using control logic to manage rectifier operations and debounce times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic boost mode is used to improve wireless power transfer efficiency, then power transfer efficiency is improved, but discontinuous conduction mode causes comparator chatter and electromagnetic interference
Solution Approach 1:
The patent implements dynamic switching between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on real-time system conditions. A controller monitors the operating state and dynamically adjusts the rectifier's conduction mode, allowing the system to optimize for efficiency when appropriate while maintaining stability when needed, thus resolving the contradiction between power transfer efficiency and comparator stability.
Solution Approach 2:
The patent changes the operating parameters of the rectifier by introducing a minimum on-time parameter for the switches. This parameter control ensures that the rectifier operates in CCM under certain conditions, preventing comparator chatter while still allowing DCM operation to maximize efficiency when conditions permit, thereby balancing both competing requirements.
2Productivity
If dynamic boost mode is used to improve wireless power transfer efficiency, then power transfer efficiency is improved, but electromagnetic interference increases
Solution Approach 1:
The patent converts the potentially harmful discontinuous conduction mode into a beneficial operating state by implementing intelligent mode selection. The controller monitors system conditions and only allows DCM operation when it will not generate excessive electromagnetic interference, while using CCM to suppress EMI when needed. This transforms what could be a harmful intermittent operation into a controlled, beneficial feature that optimizes efficiency without excessive EMI.
3Speed
If comparator response time is reduced to improve reaction speed, then control responsiveness is improved, but comparator chatter increases
Solution Approach 1:
The patent implements preliminary action by setting a minimum on-time parameter before the comparator can respond to switching events. This pre-established timing constraint ensures that comparators do not respond too quickly to transient conditions, preventing chatter while still maintaining adequate control responsiveness for legitimate operating state changes. The minimum on-time acts as a preliminary filter that blocks premature responses.
Data Source
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.