Power Supply Circuit With Integrated Over- and Undervoltage Protection
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Solution Overview
Problem
Conventional power supply circuits lack integrated and timely over-voltage and under-voltage protection functions, leading to inefficiencies in detection and protection timing.
Innovation Solution
A power supply circuit design that integrates an over-voltage protection circuit and an under-voltage protection circuit, where the output of the over-voltage protection circuit directly influences the under-voltage protection circuit, allowing for simultaneous on-off control of the switching circuit based on preset voltage limits, thereby enhancing protection timeliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent over-voltage protection circuit and under-voltage protection circuit are used, then both protection functions can be implemented, but detection time increases and protection timeliness deteriorates
Solution Approach 1:
The patent combines the over-voltage protection circuit and under-voltage protection circuit into a single integrated power supply circuit. The protection circuit includes both over-voltage detection and under-voltage detection functions that operate simultaneously through shared control logic and timing mechanisms, eliminating the sequential execution delay of independent circuits while maintaining complete protection coverage.
2Measurement precision
If sequential detection of over-voltage and under-voltage is performed, then detection accuracy is maintained, but protection timeliness deteriorates
Solution Approach 1:
The patent implements periodic simultaneous detection of both over-voltage and under-voltage conditions using a unified detection mechanism. The control circuit periodically samples the input voltage and compares it against both upper and lower thresholds concurrently, ensuring accurate detection of voltage anomalies while achieving rapid protection response through parallel evaluation of multiple voltage conditions.
Data Source
AI summary
A power source circuit includes a first power source subcircuit. The first power source subcircuit includes a first overvoltage protection circuit, a first undervoltage protection circuit, a first drive circuit, and a first switching circuit. A cascade output result of the first over-voltage protection circuit and the first undervoltage protection circuit is used to control the first switching circuit for on-off control of the first power source subcircuit.