Ground Fault Circuit Interrupter Self-Test Detection
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Solution Overview
Problem
Existing ground fault circuit interrupters (GFCIs) face challenges in detecting their own self-test function and fault detection capabilities during production tests, making it difficult to verify the functionality of the self-test and alarm responses to circuit faults after assembly.
Innovation Solution
A GFCI design incorporating a main control chip, tripping unit, and self-test detection unit that simulates a circuit fault to determine the normalcy of the self-test function and alarm signal response, utilizing a silicon controlled rectifier and mutual inductance units to monitor residual currents and trigger appropriate responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-test function is provided to simulate ground fault and detect component normalcy, then the ground fault protection function can be tested, but the self-test function itself cannot be detected and whether a fault of the ground fault circuit interrupter can be detected by its own cannot be detected
Solution Approach 1:
The patent introduces a detection switch as an intermediary component that enables the main control chip to simulate a circuit fault and test whether the self-test detection unit can detect it. The detection switch acts as a mediator between the control chip and the self-test detection unit, allowing the system to test its own self-test capability without external intervention.
Solution Approach 2:
The ground fault circuit interrupter is designed to perform self-diagnosis by using its own control chip to simulate faults and detect them through its self-test detection unit. The system serves itself by testing its own functionality without requiring external test equipment or disassembly, enabling the device to verify its self-test capability autonomously.
2Ease of manufacture
If the ground fault circuit interrupter is assembled and ready for final production test, then the device is complete and functional, but it is no longer possible to disassemble the ground fault circuit interrupter and artificially make a circuit fault to test whether the circuit fault could be found
Solution Approach 1:
The detection switch is pre-configured within the assembled device to enable fault simulation capability. Before final production testing, the system has already prepared the necessary mechanism (detection switch connected to control chip) to artificially create and detect circuit faults, eliminating the need for disassembly or external fault injection during testing.
Solution Approach 2:
The completed assembled device tests itself by using the control chip to activate the detection switch, which simulates a circuit fault condition. The self-test detection unit then detects this simulated fault, allowing the fully assembled device to verify its own fault detection capability without requiring external intervention or disassembly.
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
Enables effective testing of the self-test and alarm functions during production tests, ensuring the GFCI's ability to detect and respond to circuit faults, thereby improving production testing efficiency and reliability.
Implementation Method 1
a first mutual inductance coil coupled with the main control chip and configured to sense a residual current on the load circuit; the second mutual inductance coil coupled with the main control chip
Implementation Method 2
a silicon controlled rectifier coupled with the main control chip, wherein a gate of the silicon controlled rectifier is coupled with the first pin, an anode of the silicon controlled rectifier is coupled with the detection point
Data Source
AI summary
A ground fault circuit interrupter is provided, including a main control chip, a tripping unit and a self-test detection unit, wherein the tripping unit is connected with the self-test detection unit at a detection point and coupled with a load circuit; the self-test detection unit is coupled with the main control chip, and configured to detect a signal at the detection point and output the signal to the main control chip; the main control chip is coupled with the self-test detection unit, and configured to in a self-test state, simulate a circuit fault, perform self-test, and determine whether the circuit fault could be detected and an alarm signal response to the circuit fault is generated, based on the signal. A self-test function and alarm function response to a circuit fault in a ground fault circuit interrupter can be tested during a final test of production.