A device and method for relay state detection
A state detection and relay technology, applied in the direction of measuring devices, circuit breaker testing, instruments, etc., can solve the problems of abnormal relay operation, failure to reflect the operation state of the relay, and failure to reflect the contact operation of the relay, etc., to achieve a wide range of applications, The effect of accurate test results
Active Publication Date: 2016-08-17
WUHAN POINT LINE TECH
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[0007] The two methods of setting auxiliary contacts inside the relay and collecting relay coil current signals or voltage signals are not collecting contact signals, and both belong to indirect detection methods. When the coil and internal mechanism are in good condition, the current signal and voltage signal collected by the relay state detection circuit cannot reflect the relay contact action. At the same time, the auxiliary contact signal controlled by the relay coil current magnetic coupling transmission mechanism is the same when the relay contact is aging or damaged. , causing the relay to act abnormally, but when the relay thinks that the coil and internal mechanism are intact, it also cannot reflect the action state of the relay
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[0055] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0056] see figure 1 As shown, the present invention provides a device for relay state detection, which includes an external power supply, a signal isolation sampling module, a signal amplification module, a square wave shaping module, a level conversion module and a photoelectric isolation module.
[0057] The input end of the signal isolation sampling module is connected to the relay contact, and its output end is connected to the input end of the signal amplification module; the output end of the signal amplification module is connected to the input end of the square wave shaping module; the output end of the square wave shaping module is connected to the electric The input end of the level conversion module is connected; the output end of the level conversion module is connected with the input end of the photoelectric isolation module.
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The invention discloses a device and method for relay state inspection, and relates to the field of relays. The device comprises an external power source, a signal isolation sampling module, a signal amplification module, a square wave shaping module, a level switch module and a photoelectric isolation module. The input end of the signal isolation sampling module is connected with contacts of a relay, the output end of the signal isolation sampling module is connected with the input end of the signal amplification module, the output end of the signal amplification module is connected with the input end of the square wave shaping module, the output end of the square wave shaping module is connected with the input end of the level switch module, and the output end of the level switch module is connected with the input end of the photoelectric isolation module. The device is respectively connected with the stationary contact and the movable contact of the relay and can detect the states of the relay accurately. According to the device and method, external electromagnetic interference can be isolated, the detection result is accurate, and meanwhile the application range is wide.
Description
technical field [0001] The invention relates to the field of relay detection, in particular to a device and method for relay state detection. Background technique [0002] The relay is a safety switch with high insulation resistance. It is widely used in electrical products. When the power circuit fails, the relay can disconnect the circuit in time to prevent electrical products and workers from being damaged. Therefore, the state of the relay is electrical. An important basis for judging whether the product can work normally. [0003] At this stage, the following methods are usually used to detect the state of the relay: [0004] (1) An auxiliary contact is set inside the relay, and the opening and closing of the relay contact and the auxiliary contact are controlled by the relay coil current magnetic coupling transmission mechanism. The staff can judge the relay contact according to the opening and closing of the auxiliary contact. Whether the point is in normal working ...
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IPC IPC(8): G01R31/327G01R31/02
Inventor 周良川章志福徐沾伟
Owner WUHAN POINT LINE TECH