Leakage Detection Chip for Residual Current Protector
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Solution Overview
Problem
Residual current protectors frequently trip due to basic electric leakage from capacitive and resistive sources, causing inconvenience in production and daily life, as existing solutions fail to effectively detect and manage this type of leakage.
Innovation Solution
A chip with a peak detection circuit, clock generator, delay circuits, reference voltage module, counter, ADC/DAC modules, digital comparators, and selection circuits to accurately identify and process basic electric leakage signals, allowing for their automatic detection and storage, and decision-making on whether to output the signal to the residual current protector based on threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the residual current protector operates without basic electric leakage detection, then the device structure remains simple, but the protector trips out frequently due to basic electric leakage
Solution Approach 1:
The patent integrates the basic electric leakage detection function within the existing residual current protector by nesting the detection circuit inside the protector's internal structure. The detection circuit shares power supply and signal processing resources with the main protector circuitry, allowing the protector to acquire basic electric leakage detection capability without requiring a completely separate external detection system, thus limiting the increase in device complexity.
Solution Approach 2:
The detection circuit performs preliminary identification of basic electric leakage signals before they reach the tripping mechanism. By detecting and analyzing the characteristics of electric leakage signals in advance, the system can distinguish between basic electric leakage (which should not trigger tripping) and dangerous leakage (which should trigger tripping), preventing unnecessary tripping actions and improving operational reliability.
2Measurement precision
If the residual current protector trips out frequently due to basic electric leakage, then the detection sensitivity is high, but the inconvenience to production and life increases
Solution Approach 1:
The patent applies different evaluation criteria to different types of electric leakage signals. Basic electric leakage signals are identified by their specific temporal and amplitude characteristics and are treated differently from dangerous leakage signals. The system recognizes that not all leakage signals require the same response, applying localized judgment logic to different signal types to avoid unnecessary tripping while maintaining safety.
Solution Approach 2:
The detection circuit monitors multiple parameters of the electric leakage signal including amplitude, duration, and temporal patterns. By analyzing changes in these parameters over time, the system can distinguish between persistent basic electric leakage (which maintains stable parameters) and dangerous leakage (which shows abnormal parameter changes), enabling precise detection without causing inconvenience through false tripping.
3Extent of automation
If the chip processes and stores leakage signal values, then the intelligence of the protector improves, but the device complexity increases
Solution Approach 1:
The chip integrates multiple functions including signal detection, analog-to-digital conversion, threshold comparison, memory storage, and tripping control into a single unified device. This multi-functional design allows the protector to automatically detect basic electric leakage, store leakage signal values for analysis, make intelligent decisions about tripping based on predefined criteria, and execute control actions, thereby improving automation while managing complexity through functional integration rather than separate components.
Data Source
AI summary
Disclosed is a chip for detection of basic electric leakage on a residual current protector. Basic electric leakage can be understood as an electric leakage signal which is generated during normal operation of an electrical appliance and cannot cause a residual current protector to trip out. The chip for detection of basic electric leakage includes a peak detection circuit, a 20 ms clock generator, a 60 ms delay circuit, a 2.5 V reference voltage module, a register module, a comparator module, a counter, a digital subtractor, an analog-to-digital converter (ADC) module, a digital-to-analog converter (DAC) module, an analog adder/analog subtractor, a selection circuit, and a circuit for delayed resetting. The present disclosure can identify and eliminate a basic electric leakage signal from an input electric leakage signal, and will not affect normal operation of a load during detection, determination, storage, and output of the electric leakage signal.