Power Conversion Circuit Short-Circuit Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power conversion circuits fail to effectively and timely protect electronic devices from damage due to unstable power input, particularly high surge voltage or excessive instantaneous current, which can lead to errors or burnout.
Innovation Solution
A power conversion circuit with a voltage regulator and detection circuit that includes a first and second switch, where the detection circuit determines if the first switch is short-circuited by analyzing voltage levels and adjusts the second drive signal to turn on the second switch, thereby protecting the load by regulating the input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional OVP circuits are used to detect over-voltage conditions, then protection is provided, but the detection time is long and response is slow
Solution Approach 1:
The detection function is segmented into multiple independent detection circuits, each monitoring specific voltage nodes (first end, second end, control end of the first switch). This segmentation allows parallel detection of different fault conditions, significantly reducing overall detection time while maintaining comprehensive protection coverage.
Solution Approach 2:
The detection circuits continuously monitor voltage levels at critical nodes before actual damage occurs. By performing preliminary detection of abnormal voltage conditions, the system can trigger protection actions in advance, preventing damage to electronic elements rather than reacting after damage has occurred.
2Reliability
If voltage regulator circuit with switches is used to control output voltage, then voltage regulation is achieved, but short-circuit of the first switch can cause excessive current and damage
Solution Approach 1:
The detection circuits continuously monitor voltage levels at the first end, second end, and control end of the first switch, providing real-time feedback about the switch's operational state. When a short-circuit is detected through voltage level analysis, the system immediately responds by adjusting the second switch's drive signal, creating a closed-loop protection mechanism that maintains system reliability.
Solution Approach 2:
The detection circuit acts as an intermediary between the voltage regulator circuit and the protection mechanism. It monitors the state of the first switch and translates voltage level information into control signals for the second switch, enabling indirect protection without directly interfering with the normal operation of the first switch.
3Measurement precision
If detection circuit monitors voltage levels at multiple nodes, then detection accuracy is improved, but circuit complexity increases
Solution Approach 1:
The detection circuit is designed with multi-functionality to monitor voltage levels at multiple nodes (first end, second end, control end of the first switch) using similar detection mechanisms. This universal approach allows the same detection methodology to be applied across different measurement points, improving detection accuracy while avoiding the need for completely separate detection circuits for each node.
Solution Approach 2:
Multiple detection functions are merged into a single integrated detection circuit that can simultaneously monitor voltage levels at different nodes. By combining detection resources and sharing common components, the circuit achieves comprehensive monitoring capability while minimizing the increase in overall circuit complexity.
Data Source
AI summary
A power conversion circuit includes a voltage regulator circuit and a detection circuit. The voltage regulator circuit includes a first switch and a second switch. A first end of the first switch receives an input voltage, and a control end of the first switch receives a first drive signal. The second switch is coupled between a second end of the first switch and the ground, and is turned on or off based on a second drive signal. The first switch and the second switch regulate the input voltage to output an output voltage. The detection circuit is configured to determine whether the first switch is short-circuited or not based on a voltage level of at least one of the first end, the second end, or the control end of the first switch, and adjust the second drive signal when the first switch is short-circuited, to turn on the second switch.