Zero Crossing Switch Device with Arc Detection and Relay Control
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Solution Overview
Problem
Conventional relay systems fail to eliminate arc sparks during zero crossing point switching, leading to reduced useful life of relays and connected devices.
Innovation Solution
A switch device with a controlling and processing unit comprising a first zero point detector, a second zero point detector, an arc detector, and a microcontroller that generates relay controlling signals based on input and output voltage signals, arc-spark-induced signals, and relay delay times to manage zero crossing points for precise switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If relay switching is controlled without zero crossing detection, then switching speed is improved, but arc sparks occur reducing relay and device life
Solution Approach 1:
The system performs preliminary detection of the zero crossing point of the AC power signal before executing the relay switching action. The microcontroller unit detects when the AC voltage crosses zero and triggers the relay switch exactly at this moment, preventing arc sparks while maintaining efficient switching. This preliminary detection and timing coordination resolves the contradiction by ensuring switching occurs at the optimal moment.
2Reliability
If zero crossing point detection is implemented, then arc sparks are prevented extending device life, but system complexity increases
Solution Approach 1:
The invention replaces complex mechanical zero crossing detection mechanisms with an electronic detection system using a voltage divider circuit, rectifier, capacitor, and microcontroller. This electronic substitution achieves precise zero crossing detection while reducing mechanical complexity and improving reliability compared to traditional mechanical approaches.
Solution Approach 2:
The system uses the existing AC power signal itself to generate the zero crossing detection reference. By detecting the zero crossing point of the AC voltage that already powers the system, the invention eliminates the need for external reference signals or additional power sources, simplifying the overall system while achieving reliable zero-crossing synchronization.
3Loss of time
If relay switching occurs at non-zero crossing points, then switching response time is improved, but harmful arc sparks are generated
Solution Approach 1:
The system continuously monitors the AC power signal voltage and uses this feedback to determine the optimal switching moment. The microcontroller reads the detected voltage, compares it against the zero crossing threshold, and triggers the relay switch only when the feedback indicates the voltage is at or near zero, thereby eliminating arc sparks while maintaining minimal switching delay.
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
The device effectively prevents arc sparks by controlling relays to switch at optimal zero crossing points, extending the life of relays and connected devices by ensuring accurate and spark-free transitions.
Implementation Method 1
an arc detector 133, configured for detecting an arc-spark-induced signal from the output voltage signal
Implementation Method 2
the solenoid 102′ is electrically connected to the relay controlling unit 12′. By such arrangement, a user is able to operate his portable electronic device 13′ like a smart phone so as to activate the relay controlling unit 12′ transmit a switch controlling current o the solenoid 102′. As a result, a switch state of the 3-way switch 101′ is changed by a magnetic force generated by the solenoid 102′
Data Source
AI summary
Disclosures of the present invention describe a switch device has a controlling and processing unit comprising a first zero point detector, a second zero point detector, an arc detector, and a microcontroller. According to zero crossing point of input voltage signal, zero crossing point of output voltage signal, relay's delay time, and arc-spark-induced signal, the microcontroller is capable of adaptively generating a relay controlling signal to control the relay, such that the relay achieves a short-circuit switching at the zero cross point of output voltage signal for making the output voltage signal be transmitted to at least one load device. Moreover, the microcontroller is also able to control the relay to finish a short-circuit switching at the zero cross point of input voltage signal, so as to stop the output voltage signal from being transmitted to the load device.