Power Control Circuit With Dual Voltage Paths for Overvoltage Faults
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Solution Overview
Problem
Conventional power supply circuits with overvoltage protection mechanisms face challenges in detecting overvoltage when resistors R1 or R2 are open or short-circuited, leading to improper overvoltage setting and protection, especially when integrated with a common IC.
Innovation Solution
A power control device incorporating an output voltage controller and an overvoltage protector that uses dual detection mechanisms for feedback and output voltages to continuously monitor and adjust operations based on threshold values, ensuring effective overvoltage protection even with abnormal feedback voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the overvoltage protection circuit monitors only the feedback voltage, then the circuit complexity is reduced, but the reliability of overvoltage detection deteriorates when resistors R1 or R2 are open or short-circuited
Solution Approach 1:
The overvoltage protection function is segmented into two independent monitoring paths: one monitoring the feedback voltage through the resistor divider network, and another directly monitoring the output voltage. This segmentation ensures that if one path fails due to resistor abnormalities, the other path can still detect overvoltage conditions and trigger protection.
Solution Approach 2:
A direct voltage monitoring path is introduced as an intermediary mechanism that bypasses the feedback resistor network. This intermediary path directly samples the output voltage and provides an independent detection channel, ensuring reliable overvoltage detection even when the feedback network is compromised.
2Reliability
If the overvoltage protection circuit directly monitors the output voltage, then the overvoltage detection reliability is improved, but the adaptability to various output voltage settings deteriorates when using a common IC
Solution Approach 1:
The circuit incorporates adjustable reference voltage levels and configurable threshold settings that can be programmed or adjusted based on the specific output voltage requirements. This allows the same IC to adapt to different output voltage settings while maintaining reliable direct monitoring capability through parameter reconfiguration rather than hardware changes.
3Reliability
If dual detection mechanisms are implemented for feedback and output voltages, then the overvoltage protection reliability is improved, but the device complexity increases
Solution Approach 1:
The dual detection mechanisms are merged into a unified overvoltage protection architecture where both monitoring paths feed into a common control logic unit. This integration allows the system to coordinate both detection channels efficiently, reducing redundant components and simplifying the overall circuit implementation while maintaining the reliability benefits of dual monitoring.
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.