Grounding Wire Detection Circuit for Real-Time Safety Monitoring
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Solution Overview
Problem
Existing electrical devices lack a reliable method to detect whether they are properly grounded when using utility power, which can lead to safety hazards such as electric shocks or explosions due to the absence of a discharge loop for static electricity.
Innovation Solution
A grounding wire detection circuit that includes a grounding detection circuit and a sampling control circuit, connected to the live, neutral, and grounding wires, which isolates and converts detected currents into sampling voltages for real-time monitoring, enabling alarms or device cutoffs to ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grounding wire detection circuit is added to monitor grounding status, then safety is improved, but device complexity increases
Solution Approach 1:
The patent introduces a detection circuit as an intermediary component that safely monitors grounding status without directly exposing the control circuit to high voltage. The detection circuit acts as a mediator between the grounding wire and the control system, using isolation techniques to prevent harmful electrical interference while enabling safety monitoring.
Solution Approach 2:
The patent replaces direct electrical connection methods with optical isolation technology. Instead of using electrical signals that could carry harmful voltage, the system uses light transmission through optocouplers to transmit grounding status information, substituting electrical fields with optical fields to eliminate electrical hazards.
2Reliability
If real-time grounding monitoring is implemented, then safety hazards are prevented, but energy consumption increases
Solution Approach 1:
The detection circuit uses periodic sampling of the grounding status rather than continuous monitoring. The circuit periodically checks the grounding condition through the isolation barrier, reducing energy consumption while maintaining adequate safety monitoring. This periodic action allows the system to balance safety requirements with energy efficiency.
3Object-affected harmful factors
If grounding detection is added to electrical devices, then touch current is reduced, but manufacturing complexity increases
Solution Approach 1:
The detection circuit is designed with universal components and standardized isolation techniques that can be applied across different electrical device types. By using common optocouplers and isolation methods, the circuit can be manufactured using existing production processes, reducing the impact on manufacturing complexity while providing broad safety coverage.
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
This solution allows for real-time monitoring of device grounding, improving safety by preventing electric shocks and potential explosions, and ensuring the electrical device operates safely by detecting and responding to grounding status.
Implementation Method 1
a sampling control circuit, configured to isolate a current detected by the grounding detection circuit and convert the current into a sampling voltage
Data Source
AI summary
The present disclosure discloses a grounding wire detection circuit, for monitoring whether an electrical device is grounded in real time, the grounding wire detection circuit including: a grounding detection circuit and a sampling control circuit, wherein the grounding detection circuit is electrically connected to a live wire, a neutral wire and a grounding wire of a single-phase three-wire type input, the live wire and the neutral wire are electrically connected to a main circuit of the electrical device; and the sampling control circuit is configured to isolate a current detected by the grounding detection circuit and convert the current into a sampling voltage. The real-time monitoring of whether or not a device is grounded may be achieved by detecting the sampling voltage, so as to alarm, cut off electrical device accordingly, which can improve safety of using the electrical device.