Adaptive Overvoltage Protection for Isolated Switching Converters
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Solution Overview
Problem
Isolated switching converters face challenges in setting an optimal overvoltage protection threshold, as a threshold set too low leads to false triggering, while a threshold set too high may result in overvoltage damage, especially when the voltage demand of the load device varies.
Innovation Solution
A control circuit that dynamically adjusts the overvoltage protection threshold based on the output voltage setting signal and the peak value of the primary current, ensuring the threshold is adaptive and only triggered when necessary, thereby preventing misoperation and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed overvoltage protection threshold is used, then the control circuit is simple, but it cannot adapt to varying load conditions
Solution Approach 1:
The patent transforms the static fixed threshold into a dynamic adaptive threshold that automatically adjusts to varying load conditions. The control circuit incorporates logic that compares output voltage feedback with a dynamically determined threshold based on primary current, enabling the system to adapt to different operating conditions without requiring complex external adjustment mechanisms
Solution Approach 2:
The patent implements a self-adjusting protection mechanism where the control circuit automatically determines the appropriate protection threshold based on its own monitoring of primary current and output voltage. The system serves itself by autonomously adapting the protection level without requiring external intervention or complex configuration, balancing simplicity with adaptability
Data Source
AI summary
A method of controlling an isolated switching converter having an output voltage that is adjustable, can include: sampling an output voltage of the isolated switching converter; setting an overvoltage protection threshold corresponding to the output voltage of the isolated switching converter when the isolated switching converter enters a protection mode; and triggering the overvoltage protection by comparing an output voltage feedback signal representing the output voltage against the overvoltage protection threshold.