Relay Anti-Adhesion Device with Square Wave Detection and Interlocking Control
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Solution Overview
Problem
Existing anti-adhesion devices for relays in electric heater circuits fail to simultaneously detect relay adhesion and ensure circuit stability, leading to potential continuous heating, parallel connection issues, and current overload due to the lack of consideration for detecting circuit failures.
Innovation Solution
A stable and reliable anti-adhesion device is introduced, incorporating a control circuit and adhesion detecting circuit for two relays, with an interlocking circuit that forms a detecting loop using a square wave signal to assess relay operation and output alarm signals for faulty conditions, preventing parallel operation and ensuring proper heating control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay adhesion detection function is added, then relay adhesion can be monitored, but interlocking control function cannot be realized simultaneously
Solution Approach 1:
The patent designs the microcontrol unit to perform multiple functions: it detects relay adhesion through the detecting loop, implements interlocking control by controlling the switch's on-and-off states, and generates alarm signals for faulty conditions. This multi-functional design allows the system to simultaneously achieve relay adhesion monitoring and interlocking control capabilities within a single integrated control unit.
Solution Approach 2:
The patent merges the adhesion detection function and interlocking control function into a unified system controlled by the microcontrol unit. The control circuit's switch and the detecting loop are integrated such that the same control mechanism serves both detection and control purposes, enabling simultaneous operation of both functions without requiring separate independent systems.
2Ease of operation
If relay control circuit monitors heating elements, then heating control can be achieved, but parallel connection and current overload issues cannot be prevented
Solution Approach 1:
The patent implements preliminary anti-action by using the microcontrol unit to proactively monitor the detecting loop and predict potential harmful conditions such as relay adhesion or circuit failures. Before parallel connection or current overload can occur, the system detects the abnormal state through the detecting loop and triggers alarm signals or prevents the harmful condition from developing, thus preventing rather than merely responding to these dangerous situations.
Solution Approach 2:
The patent uses feedback mechanisms where the microcontrol unit continuously monitors the state of heating elements through the detecting loop and adjusts the relay control accordingly. When abnormal conditions are detected, the system provides feedback to prevent parallel connection of heating elements and avoid current overload, ensuring safe operation while maintaining heating control functionality.
Data Source
AI summary
A kind of anti-adhesion device for a relay. The device can include a control circuit and adhesion detecting circuit of first and second relays, which are used to respectively control power on and power off of the first and second electric heater. Closing a switch of the control circuit of the first and second relays is used to lead out the line and the output elements of the adhesion detecting circuit, to form a detecting loop. An interlocking circuit is bridged between the control circuit of the first and second relay. Therefore the first and second relay won't be closed at the same time, to avoid the fault caused by parallel connection of electric heaters. The adhesion detecting circuit can output a square wave when a relay has adhesion. The square wave avoids mixing with a low level output of the detecting circuit.