Zero-Crossing Detection for No-Neutral Switches
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Solution Overview
Problem
Conventional single line wire dimmers for adjusting illumination intensity in household devices struggle to detect the zero-crossing point of a power supply, making it difficult to achieve precise phase cut dimming due to the absence of a complete alternating current signal.
Innovation Solution
A zero-crossing detection device for no-neutral switches, comprising a sampling module, comparison module, and computing module, which samples signals from both ends of the switch element, compares deviations with a preset threshold, and computes the zero-crossing point, even in the absence of a complete AC signal, using triggering signals and time delays to determine the exact zero-crossing point for power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single line wire dimmer is used to adjust illumination intensity, then the electronic switch can be conveniently mounted and replaced, but a complete alternating current signal cannot be detected making it difficult to find the zero-crossing point
Solution Approach 1:
The patent segments the AC signal detection into two separate sampling points: the first end of the switch element (connected to power supply) and the second end of the switch element (connected to load). By sampling signals at both ends independently and comparing their deviation, the system can detect zero-crossing points without requiring a complete AC signal, thus resolving the contradiction between ease of installation and measurement precision.
Solution Approach 2:
The patent introduces a comparison module as an intermediary that compares the deviation between signals sampled at both ends of the switch element with a preset threshold. This intermediary mechanism enables zero-crossing detection in single-line configurations where traditional complete AC signal detection is not possible, maintaining both installation convenience and detection accuracy.
2Ease of operation
If conventional single line wire dimmer is used, then installation is simple, but phase cut dimming cannot be achieved precisely due to absence of complete AC signal
Solution Approach 1:
The patent divides the signal acquisition process into two separate sampling locations (both ends of the switch element) rather than requiring a single complete AC signal. This segmentation allows the system to achieve precise phase cut dimming control through deviation comparison while maintaining the simplicity of single line wire installation.
Solution Approach 2:
The patent changes the detection parameter from requiring a complete AC voltage signal to detecting signal deviation between two sampling points. By comparing the deviation with a preset threshold and computing zero-crossing points from triggering signals and time delays, the system achieves precise phase cut dimming control without needing complete AC signal information.
3Measurement precision
If complete AC signal is required for zero-crossing detection, then accurate phase cut dimming can be achieved, but device complexity increases and installation becomes difficult
Solution Approach 1:
The patent extracts only the necessary information for zero-crossing detection by sampling signals at both ends of the switch element and comparing their deviation, rather than requiring acquisition of the complete AC signal. This extraction approach maintains measurement precision while reducing device complexity and installation difficulty.
Solution Approach 2:
The system uses the existing electrical connections at both ends of the switch element for signal sampling, leveraging the installed wiring infrastructure. By comparing deviation between these naturally available signal points and using preset thresholds, the system achieves accurate zero-crossing detection without adding complex signal acquisition hardware.
4Adaptability or versatility
If deviation comparison with preset threshold is used, then zero-crossing point can be found without complete AC signal, but additional processing steps are required
Solution Approach 1:
The deviation comparison mechanism with preset threshold serves multiple functions: it enables zero-crossing detection for different load types (such as LED), works with single line wire configurations, and provides adaptability to different AC frequencies. This universal approach increases versatility while keeping the processing structure relatively simple through modular design.
Data Source
AI summary
Provided are a zero-crossing detection device and a method thereof, a no-neutral switch, a storage medium and a processor. The no-neutral switch may include a switch element, the switch element has a first end connected to a power supply and a second end connected to a load, and the zero-crossing detection device may include: a sampling module configured to sample a first signal of the first end of the switch element and a second signal of the second end of the switch element; a comparison module configured to compare a deviation of the first signal and the second signal with a preset threshold; and a computing module configured to compute a zero-crossing point of the power supply according to a comparison result of the comparison module and the preset threshold.