Voltage Fluctuation Detection Circuit With Low-Voltage Masking
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Solution Overview
Problem
Existing voltage fluctuation detection circuits require semiconductor elements with high breakdown voltage, which increases costs and complicates manufacturing, especially when detecting voltage fluctuations in systems like lead batteries.
Innovation Solution
A voltage fluctuation detection circuit that includes a source voltage decrease detection circuit, an erroneous detection prevention circuit, and a mask circuit, allowing the use of semiconductor elements with low breakdown voltage by detecting voltage changes using a second power supply and preventing erroneous detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor element with high breakdown voltage is used to detect source voltage fluctuation, then the detection reliability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The voltage detection function is segmented into two parts: a first power supply for normal operation and a second power supply for detection. The second power supply operates at a lower voltage level that matches the breakdown voltage of standard semiconductor elements, allowing reliable detection without requiring high-breakdown-voltage components. This segmentation resolves the contradiction by enabling reliable detection through voltage level separation rather than using complex high-breakdown-voltage semiconductor elements.
2Measurement precision
If a semiconductor element with high breakdown voltage is used, then the detection accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
A voltage conversion mechanism acts as an intermediary between the high-voltage first power supply and the low-voltage second power supply. This intermediary converts the source voltage to a lower detection voltage level that can be accurately measured by standard semiconductor elements with low breakdown voltage. The intermediary enables accurate detection without requiring expensive high-breakdown-voltage components, thus resolving the contradiction between detection accuracy and manufacturing cost.
3Adaptability or versatility
If voltage fluctuation detection is implemented using related art technique, then the detection function is achieved, but the semiconductor element requirements increase breakdown voltage
Solution Approach 1:
The detection system changes the voltage parameter from high voltage (first power supply) to low voltage (second power supply) for the actual detection operation. By operating the detection circuit at a lower voltage level that matches standard semiconductor element specifications, the harmful high breakdown voltage requirement is eliminated while maintaining the voltage fluctuation detection function. This parameter transformation resolves the contradiction between achieving detection functionality and avoiding high breakdown voltage requirements.
Data Source
AI summary
A voltage fluctuation detection circuit includes: a source voltage decrease detection circuit configured to detect a decrease in voltage of a first power supply which outputs a first voltage and to output the result of detection as a voltage decrease detection signal using a second voltage which is lower than the voltage of the first power supply; an erroneous detection prevention circuit configured to detect an increase in voltage of the first power supply and to output the result of detection as a voltage increase detection signal using the second voltage; and a transistor configured to mask outputting of the voltage decrease detection signal in a period in which the increase in voltage of the first power supply is being detected based on the voltage increase detection signal.