AC Input Voltage Detecting Device with Dual-Path Segmentation
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Solution Overview
Problem
Current AC input voltage detecting devices incorrectly indicate normal power supply when either the neutral or live voltage is abnormal, leading to incorrect operations in electronic products.
Innovation Solution
An AC input voltage detecting device with a determining unit comprising two power switches and voltage-detecting units connected to both the neutral and live lines, ensuring a normal power supply signal is generated only when both voltages are normal, using MOSFETs and photo-couplers to accurately detect and indicate voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voltage detection is used, then the device complexity is reduced, but the reliability of power supply detection deteriorates due to false normal indications
Solution Approach 1:
The power supply detection is segmented into two independent detection paths: one for neutral voltage (via first voltage-detecting unit and first power switch) and one for live voltage (via second voltage-detecting unit and second power switch). Each path independently monitors its respective voltage, and both must indicate normal conditions for the overall system to indicate normal power supply. This segmentation eliminates false normal indications while maintaining manageable device complexity through modular architecture.
2Reliability
If dual voltage detection with series switches is implemented, then the reliability of power supply detection is improved, but the device complexity increases
Solution Approach 1:
The determining unit serves multiple functions simultaneously: it detects neutral voltage through the first voltage-detecting unit, detects live voltage through the second voltage-detecting unit, controls the series connection of two power switches, and generates the final power supply status indication. This multi-functionality consolidates what could be separate complex subsystems into a single integrated unit, improving reliability without proportionally increasing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents incorrect operations by accurately detecting normal AC power supply conditions, ensuring the signal indicates normal power only when both neutral and live voltages are normal, thus avoiding false positives from abnormal voltage conditions.
Implementation Method 1
The first voltage-detecting unit is electrically connected to the first input and the first power switch
Implementation Method 2
The second voltage-detecting unit is electrically connected to the second input and the second power switch
Implementation Method 3
using MOSFETs and photo-couplers to accurately detect and indicate voltage conditions
Data Source
AI summary
An AC input voltage detecting device includes a first input, a second input, a determining unit, a first voltage-detecting unit, and a second voltage-detecting unit. The first input and the second input are electrically connected to a neutral line and a live line of an AC power, respectively. The determining unit includes a first power switch, a second power switch, and an output, the first and second power switch are electrically connected in series, and the output is coupled to the second power switch. The first voltage-detecting unit is electrically connected to the first input and the first power switch, the second voltage-detecting unit is electrically connected to the second input and the second power switch. A signal for indicating that the AC power supplies normally is generated from the determining unit while the voltages conducted by the live line and the neutral line are normal.