Compact Leakage Protector Using MCU and Electromagnet
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Solution Overview
Problem
Conventional leakage protectors are large in size, occupying excessive space and limiting their widespread use, despite their safety and reliability.
Innovation Solution
A compact leakage protector design incorporating a housing, rotating member, MCU, electromagnet, and leakage protection module, which uses a rotating mechanism controlled by the MCU and electromagnet to connect or disconnect input and output terminals, reducing space occupancy and enabling effective leakage protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional circuit breaker is used for leakage protection, then safety and reliability are improved, but device size and occupied space increase
Solution Approach 1:
The patent replaces the traditional mechanical circuit breaker mechanism with an electronic control system comprising an MCU, electromagnet, and rotating member. The electromagnet actuates the rotating member to open or close contacts, substituting complex mechanical trip mechanisms with a simpler electromechanical system that occupies less space while maintaining reliability
Solution Approach 2:
The patent changes the operational parameters by using an electromagnet with controlled magnetic field strength to actuate the rotating member. By controlling the current to the electromagnet, the system can reliably open or close the circuit, achieving the same protective function with a more compact design than conventional thermal-magnetic circuit breakers
2Reliability
If a conventional circuit breaker is used for leakage protection, then safety and reliability are improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary mechanical components from traditional circuit breakers, retaining only the essential functions: leakage detection via zero-sequence current transformer, control via MCU, and contact actuation via electromagnet. This extraction of essential functions reduces device complexity while maintaining safety and reliability
Solution Approach 2:
The rotating member serves multiple functions: it acts as a magnetic pole for the electromagnet, a mechanical lever for the pressing member, and a contact carrier for the elastic member. This multi-functionality reduces the number of separate components needed, simplifying the overall device structure while maintaining reliable operation
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 compact design allows for efficient leakage protection while minimizing space usage, making the protector more suitable for widespread application compared to traditional circuit breakers.
Implementation Method 1
The electromagnet is configured to attract the magnetic member to drive the rotating member to rotate
Implementation Method 2
The leakage protection module includes a first zero sequence current transformer and a second zero sequence current transformer
Data Source
AI summary
A leakage protector comprises a housing, a rotating member, a MCU (Microprogrammed Control Unit), an electromagnet, and a leakage protection module. The rotating member, the MCU, the electromagnet and the leakage protection module are all disposed in the housing. The housing is provided with an input terminal and an output terminal. The MCU is configured to perform power supply through the input terminal. The leakage protector has a compact structure while reducing the cost, and effectively reduces the occupied space.