AC/DC Voltage Detection Circuit Using Flip-Based Signal Sampling
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Solution Overview
Problem
Existing integrated circuits (ICs) face challenges in accurately detecting AC/DC signals without increasing circuit complexity, while also ensuring fast detection speed and optimal performance at a low cost.
Innovation Solution
The AC/DC voltage detection circuit employs a rising edge trigger circuit and a detection and output circuit to sample the operating voltage with a preset clock period, allowing for accurate detection of AC/DC characteristics by monitoring target flips in the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a specially designed circuit is used to detect AC/DC voltage characteristics, then detection accuracy is improved, but circuit complexity increases
Solution Approach 1:
The detection circuit is divided into three functional modules: a voltage division circuit that scales down the input voltage, a comparison circuit that compares the scaled voltage against a reference, and a detection circuit that determines AC/DC characteristics. This segmentation allows each module to perform a specific function with simple circuitry, achieving accurate detection without overall circuit complexity
Solution Approach 2:
A voltage division circuit acts as an intermediary between the high-voltage input signal and the comparison circuit. This intermediary scales the voltage to a safe and measurable level, enabling accurate detection while protecting subsequent circuit stages and maintaining overall circuit simplicity
2Device complexity
If the detection circuit is simplified to reduce cost and volume, then circuit complexity is reduced, but detection accuracy deteriorates
Solution Approach 1:
The circuit uses parameter changes in the voltage division ratio and comparison threshold to optimize detection accuracy. By adjusting these parameters, the simple circuit structure achieves high detection accuracy for AC/DC characteristics without requiring complex circuitry
Solution Approach 2:
The comparison circuit automatically adapts to different input conditions by comparing the scaled voltage against a reference voltage, self-determining whether the input is AC or DC without requiring external control or complex processing logic
3Productivity
If the sampling frequency is increased to improve detection speed, then detection speed is improved, but energy consumption increases
Solution Approach 1:
The detection circuit uses periodic sampling at an optimized frequency to detect voltage characteristics. This periodic action achieves fast detection by capturing essential signal features at specific intervals, rather than requiring continuous high-frequency sampling, thereby reducing energy consumption while maintaining detection speed
Data Source
AI summary
The present disclosure provides an alternating current (AC)/direct current (DC) voltage detection circuit, which includes a rising edge trigger circuit and a detection and output circuit connected to an output terminal of the rising edge trigger circuit. When the detection and output circuit detects that the output signal of the rising edge trigger circuit undergoes preset m target flips in M consecutive clock periods, the detection and output circuit generates an AC determination signal, where m is a natural number.