Relay Adhesion Detection in Charging Piles
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Solution Overview
Problem
Existing charging technologies face challenges in safely detecting adhesion in alternating current relays within charging piles, as conventional methods require cooperation between two relays and can lead to secondary hazards.
Innovation Solution
A detection device and method for inspecting relays that perform adhesion detection on each relay in the charging pile without requiring an action from the relay, using a detection module and an isolation output module to output control and detection signals based on the relay's on-off state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesion detection method using two relays is used, then detection can be performed, but one relay must always be on and switching off relays is required which may cause secondary hazards
Solution Approach 1:
The patent introduces a detection module as an intermediary device that detects relay adhesion state without requiring the relay to be switched off. The detection module includes signal input terminals connected to the relay circuit and a detection unit that analyzes the signal to determine if the relay is stuck, thereby avoiding the need to turn off the relay and eliminate secondary hazards while maintaining detection accuracy
Solution Approach 2:
The patent replaces the mechanical relay switching operation with an electrical signal detection method. Instead of mechanically switching off the relay to test for adhesion, the system uses the detection module to send detection signals through the relay circuit and analyze the response, substituting mechanical action with electrical measurement to avoid hazards
2Reliability
If relay switching is required for detection, then adhesion state can be identified, but the detection process becomes complex and requires coordination between multiple relays
Solution Approach 1:
The patent extracts the detection function from the relay system itself and places it in a separate detection module. This modular approach allows the detection logic to be independent of the relay control logic, simplifying the overall system architecture and eliminating the need for complex coordination between multiple relays while maintaining reliable adhesion detection
Data Source
AI summary
A detection device, and a method for inspecting a relay, and a charging pile are provided. The detection device includes a detection module and an isolation output module. The detection module includes a first signal input terminal for connecting to an output side of a relay and a second signal input terminal for connecting to a neutral wire. A signal output terminal of the detection module is configured to connect to a control end of the isolation output module. The detection module is configured to output a control signal based on an on-off state of the relay. A signal output terminal of the isolation output module is configured to connect to a fault identification device. The isolation output module is configured to output a to detection signal with a duty cycle corresponding to the control signal, to inform the fault identification device to detect whether the relay is stuck.