Dual-Threshold Power Control for Feedback Fault Overvoltage Protection
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Solution Overview
Problem
Conventional power supply circuits face challenges in effectively performing overvoltage protection when feedback voltage abnormalities occur, such as resistor open or short circuits, which can lead to improper overvoltage setting and detection issues, especially when resistors are externally provided with a common IC configuration.
Innovation Solution
A power control device incorporating an output voltage controller and an overvoltage protector that uses dual detection mechanisms to monitor both output voltage and feedback voltage thresholds, ensuring proper overvoltage protection even in abnormal feedback conditions by utilizing a first and second overvoltage protection circuit within a semiconductor IC, allowing for flexible overvoltage setting across various output voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single overvoltage protection circuit monitoring feedback voltage is used, then the device complexity is reduced, but the reliability of overvoltage protection deteriorates when feedback voltage abnormalities occur
Solution Approach 1:
The overvoltage protection function is segmented into two independent detection circuits: a first overvoltage protection circuit that monitors feedback voltage and a second overvoltage protection circuit that monitors output voltage directly. This segmentation allows each circuit to independently detect overvoltage conditions through different pathways, ensuring that a fault in one detection method does not compromise overall protection reliability.
Solution Approach 2:
The patent introduces an intermediary detection mechanism where the second overvoltage protection circuit acts as a backup monitor that directly observes output voltage when the primary feedback voltage monitoring path becomes unreliable. This intermediary circuit provides an alternative detection pathway that bridges the gap when the main feedback loop is compromised by component failures.
2Adaptability or versatility
If external resistors are used for voltage division, then the adaptability to different output voltage settings is improved, but the difficulty of detecting and measuring feedback voltage abnormalities increases
Solution Approach 1:
The system employs dual feedback monitoring: the primary feedback voltage is monitored by the first overvoltage protection circuit, and simultaneously the output voltage is monitored by the second overvoltage protection circuit. This dual feedback mechanism provides redundant detection pathways, allowing the system to identify abnormalities in the feedback voltage division path by comparing readings from both monitoring circuits.
Solution Approach 2:
The patent implements excessive monitoring by adding a second overvoltage protection circuit beyond the single required for basic operation. This partial redundancy creates an additional detection layer that specifically targets the identification of feedback path abnormalities, enabling the system to detect and respond to resistor failures or connection issues that would otherwise go unnoticed.
3Object-affected harmful factors
If the overvoltage protection circuit stops operation when feedback voltage is abnormal, then the harmful effects of undetected overvoltage are reduced, but the loss of information about actual output voltage status occurs
Solution Approach 1:
The second overvoltage protection circuit is pre-configured to directly monitor output voltage and is ready to detect overvoltage conditions independently of the feedback voltage status. When the feedback voltage becomes abnormal, this preliminary monitoring capability ensures that overvoltage detection continues uninterrupted, preventing both undetected overvoltage damage and information loss about actual output voltage status.
Solution Approach 2:
The patent establishes a cushioning protection mechanism where the second overvoltage protection circuit serves as a backup safeguard that activates or provides continuous monitoring when the primary feedback voltage monitoring becomes unreliable. This prior cushioning ensures that even if the main detection pathway fails, overvoltage protection information is preserved and overvoltage damage is prevented.
Data Source
AI summary
A power control device includes: an output voltage controller configured to control an output voltage based on a feedback voltage corresponding to the output voltage; and an overvoltage protector configured to continue or stop the operation of the output voltage controller based on a first detection result of whether the output voltage has exceeded an output voltage threshold value and a second detection result of whether the feedback voltage has fallen to or below a feedback voltage threshold value.