AC/DC Voltage Detection Circuit Using Rising-Edge 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 reduced 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, enabling detection of AC/DC characteristics by monitoring target flips in the output signal, thereby achieving a balance between circuit complexity, detection accuracy, and speed.
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 two functional modules: a rising edge trigger circuit that samples voltage changes and generates trigger signals, and a detection and output circuit that counts trigger signals to determine AC/DC characteristics. This segmentation allows each module to perform a specific function with simple circuitry, avoiding the need for a single complex detection circuit while maintaining high detection accuracy.
2Device complexity
If the circuit is simplified to reduce complexity and cost, then device complexity is reduced, but detection accuracy deteriorates
Solution Approach 1:
The rising edge trigger circuit acts as an intermediary between the input voltage signal and the detection and output circuit. It converts complex voltage waveform analysis into simple rising edge detection and trigger signal generation, enabling the downstream circuit to count events rather than analyze waveforms, thus simplifying the overall circuit while preserving detection accuracy.
3Productivity
If sampling frequency is increased to improve detection speed, then detection speed is improved, but circuit complexity increases
Solution Approach 1:
The circuit uses periodic clock signals to control the sampling operation of the rising edge trigger circuit. By synchronizing sampling to regular clock cycles, the system achieves consistent detection speed without requiring complex continuous monitoring circuits. The periodic sampling approach simplifies timing control while maintaining adequate detection speed for AC/DC voltage characterization.
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 operating voltage is higher than the preset voltage, the determination circuit activates the detection and output circuit to detect the change of the operating voltage and the target flip.