Voltage Detection Circuit With Switched Reference Thresholds

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Solution Overview

Problem

Current voltage detection mechanisms in electronic devices fail to accurately detect significant voltage drops, leading to potential circuit failures due to the use of a single set of reference voltages that may not discern minor voltage anomalies.

Innovation Solution

A voltage detection device employing multiple sets of reference voltages, including a reference voltage latch circuit and digital circuit, selectively switches between these sets based on detection signals to enhance accuracy, using a flip-flop and multiplexer to manage the reference voltage outputs and ensure correct circuit operation during sudden voltage changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single set of reference voltages is used for voltage detection, then the device complexity is reduced, but the measurement precision of voltage anomalies deteriorates

Engineering Contradiction:

Improvevoltage detection device structureVSAvoidvoltage detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The reference voltage system is segmented into multiple sets (first set, second set, third set) with different voltage levels. Each set serves a specific detection purpose, allowing the system to detect various voltage anomaly conditions that a single reference voltage level cannot detect, thereby improving measurement precision without excessive complexity increase

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reference voltage selection is made dynamic through a latch circuit that can switch between different reference voltage sets based on detection needs. The system dynamically selects appropriate reference voltages for comparison, enabling adaptive detection of different voltage drop scenarios while managing complexity through controlled switching

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If multiple sets of reference voltages are used to improve detection accuracy, then the measurement precision is improved, but the device complexity increases

Engineering Contradiction:

Improvevoltage detection accuracyVSAvoidvoltage detection device structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple reference voltage sets are merged into a unified detection system through a latch circuit that manages switching between them. The first voltage detector, second voltage detector, and reference voltage latch circuit work together as an integrated system, reducing the overall complexity that would result from completely separate detection systems

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The reference voltage latch circuit serves multiple functions: it stores reference voltages, selects appropriate reference voltage sets based on detection signals, and provides stable reference outputs to multiple voltage detectors. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby managing device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Speed

If the reference voltage latch circuit is continuously reset, then the detection responsiveness is improved, but the stability of reference voltage output deteriorates

Engineering Contradiction:

Improvedetection responsivenessVSAvoidreference voltage output stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The reset operation is performed periodically or event-driven rather than continuously. The latch circuit receives reset signals at specific intervals or when voltage anomalies are detected, allowing the reference voltage to remain stable during normal operation while enabling timely updates when needed, thus balancing responsiveness and stability

Inventive Principle:

Principle #19Periodic action

4Stability of the object's composition

If the reference voltage latch circuit maintains continuous output, then the stability of reference voltage output is improved, but the detection responsiveness to voltage changes deteriorates

Engineering Contradiction:

Improvereference voltage output stabilityVSAvoiddetection responsiveness

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The system incorporates feedback mechanisms where detection signals from voltage detectors are fed back to the reference voltage latch circuit. When voltage anomalies are detected, the feedback triggers appropriate actions such as resetting the latch or switching reference voltage sets, enabling the system to maintain stability during normal operation while responding promptly to actual voltage changes through the feedback loop

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12360138B2Voltage detection device and method for preventing system failure

Publication Date: 2025.07.15 SIGMASTAR TECH LTD

AI summary

A voltage detection device includes: a reference voltage latch circuit, outputting one of a first set of reference voltages and a second sets of reference voltages lower than the first set of reference voltages, as a third set of reference voltages according to a selection signal, and being selectively to be reset or to continue outputting the one of the first and second sets of reference voltages as the third set of reference voltages according to a first detection signal; a first voltage detector, generating the first detection signal according to a fourth set of reference voltages lower than or equal to the first set of reference voltages and an input voltage; a second voltage detector, generating a second detection signal according to the third set of reference voltages and the input voltage; and a digital circuit, generating the selection signal according to the second detection signal.