Power Supply Abnormality Detection Circuit Using Logic Frequency Division

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Solution Overview

Problem

Existing power supply abnormality detection circuits are prone to increased circuit area and noise susceptibility due to their analog nature, which complicates the detection of voltage abnormalities.

Innovation Solution

A logic-based power supply abnormality detection circuit that utilizes a first and second dividing circuit part to divide clock signals by different ratios based on normal and abnormal voltage conditions, with a comparison circuit performing an exclusive-or operation and synchronization to determine voltage abnormalities, thereby eliminating the need for analog circuits and reducing noise influence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an analog circuit is used for power supply abnormality detection, then the detection function is achieved, but the circuit area increases and noise susceptibility increases

Engineering Contradiction:

Improvepower supply abnormality detection accuracyVSAvoidcircuit area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent replaces the analog circuit system with a digital logic circuit system. Specifically, it uses dividing circuits, comparison circuits, and synchronization circuits composed of logic elements to detect power supply abnormalities, thereby reducing circuit area and noise susceptibility while maintaining detection functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection approach from direct analog voltage comparison to frequency division ratio comparison. By dividing the input clock signal by different ratios based on voltage conditions and comparing the divided frequencies, the system achieves abnormality detection with reduced circuit complexity and improved noise immunity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If an analog circuit is used for power supply abnormality detection, then the detection function is achieved, but noise susceptibility increases

Engineering Contradiction:

Improvepower supply abnormality detection accuracyVSAvoidnoise susceptibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses simple logic circuit elements (dividing circuits, comparators, synchronization circuits) that are robust against noise and easier to manufacture with high yield, replacing complex analog components that are sensitive to noise and harder to manufacture precisely

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Area of stationary object

If logic circuits are used instead of analog circuits, then circuit area is reduced and noise influence is reduced, but the detection mechanism becomes more complex

Engineering Contradiction:

Improvecircuit areaVSAvoiddetection mechanism complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The patent segments the detection mechanism into three independent functional modules: a first dividing circuit part that divides clock frequency by a first ratio, a second dividing circuit part that divides clock frequency by a second ratio under abnormal conditions, and a comparison circuit part that compares the two divided signals. This segmentation simplifies the overall design and reduces circuit area while maintaining detection capability

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240142545A1Power supply abnormality detection circuit

Publication Date: 2024.05.02 LAPIS TECH CO LTD

AI summary

Provided is a power supply abnormality detection circuit capable of detecting a power supply abnormality using a logic circuit.The power supply abnormality detection circuit includes a preset first dividing circuit part dividing a frequency of an input clock signal by a frequency of a first ratio and output the divided frequency, a second dividing circuit part dividing a frequency of the input clock signal by the frequency of the first ratio when a power supply voltage is a normal voltage, and dividing a frequency of an input signal by a frequency of a second ratio different from the first ratio and outputting the divided frequency when the power supply voltage is an abnormal voltage, and a comparison circuit part performing comparison of two signals of an output signal of the first dividing circuit part and an output signal of the second dividing circuit part.