QR Flyback Controller Dynamic Threshold Jitter for EMI Reduction
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Solution Overview
Problem
Existing QR flyback converters face challenges in minimizing electromagnetic interference (EMI) and optimizing switching operations due to fixed threshold values and time delays, which can lead to inefficiencies and increased EMI characteristics.
Innovation Solution
A controller for QR flyback converters that dynamically adjusts the threshold value and time delay, allowing for periodic modifications to improve EMI characteristics by introducing jitter in the switching operations, thereby optimizing the switching frequency and reducing EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fixed threshold values and time delays are used in QR flyback converter control, then the control mechanism is simple, but electromagnetic interference increases and switching efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the threshold value and time delay adjustable rather than fixed. The controller dynamically modifies these parameters based on operating conditions, allowing the system to adapt to different switching states and minimize EMI while maintaining control simplicity through automated adjustment.
Solution Approach 2:
The patent directly implements parameter changes by periodically modifying the threshold value and/or time delay parameters. This allows the controller to optimize switching operations under different conditions, reducing electromagnetic interference without requiring a fundamentally complex control architecture.
2Productivity
If fixed threshold values and time delays are used, then the control mechanism is simple, but switching operation efficiency decreases
Solution Approach 1:
The controller dynamically adjusts threshold values and time delays based on real-time switching operations, enabling optimization of efficiency without requiring complex manual intervention. The system automatically adapts parameters to maintain high productivity across varying operating conditions.
Solution Approach 2:
The patent implements feedback mechanisms where the controller receives input signals from the QR flyback converter, determines designated points in time based on switching operations, and uses this information to periodically modify control parameters. This closed-loop approach optimizes switching efficiency while keeping the control mechanism manageable.
3Object-affected harmful factors
If dynamic adjustment of threshold values and time delays is implemented, then electromagnetic interference is reduced, but control complexity increases
Solution Approach 1:
The patent applies periodic action by modifying threshold values and time delays at regular intervals rather than continuously or randomly. This periodic modification reduces EMI while keeping the control logic manageable, as the system follows a structured adjustment pattern rather than requiring complex real-time calculations.
Solution Approach 2:
The controller periodically changes control parameters (threshold value and/or time delay) to optimize performance and reduce EMI. This systematic parameter modification approach achieves EMI reduction without requiring overly complex control mechanisms, as the changes follow a defined periodic pattern.
Data Source
AI summary
A controller (100) for a quasi-resonant (QR) flyback converter (200) having a switching element (210) operable at a switching frequency (F) is presented. The controller (100) is configured for repeatly: receiving, from the QR flyback converter (200), a controller input signal (ZC); determining a designated point of time at which the controller input signal (ZC) equals a threshold value (V_zcd), the designated point of time depending on a switching operation of the switching element (210); in response to determining the designated point of time, providing, to the QR flyback converter (200) and after a time delay, a controller output signal (G) for causing a further switching operation of the switching element (210); and modifying at least one of the threshold value (V_zcd) and the time delay (DT) by an amount, wherein modifying the at least one of the threshold value (V_zcd) and the time delay (DT) varies periodically, the period (TMF) of the modification period being the inverse of a modification frequency (MF).