Isolated detection circuit for scanning switch internal relay status
A detection circuit, scanning switch technology, applied in the direction of circuit breaker testing, etc., can solve the problems of complex wiring, easy interference, large circuit power consumption, etc., to achieve the effect of reducing interference, simplifying the circuit, and reducing wiring
Active Publication Date: 2017-08-15
CHINA JILIANG UNIV
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[0004] In order to solve the problems of high power consumption, easy interference, and complicated wiring of the above-mentioned circuit, the present invention provides an isolated detection circuit for scanning the state of the internal relay of the switch
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[0028] In the process of developing a four-wire scanning switch with low thermal potential, the external LED indicator light needs to accurately indicate the on-off status of its corresponding internal relay. The four wires are current high end, voltage high end, voltage low end, and current low end; for a scan switch, the current high end and voltage high end are required to be turned on at the same time, and the voltage low end and current low end are turned on at the same time, and then it is counted as one channel being connected. Pass. Here we take the current high-end and voltage high-end as an example, use two magnetic latching relays to control the current high-end and voltage high-end respectively, and use this as an example to introduce how to isolate the relay to be detected from other non-operating relays, and then pass it on. accurate detection of off state. Connect the power supply terminals of the two magnetic latching relays together and connect them to the so...
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The invention discloses an isolated detection circuit for scanning the internal relay state of a switch. The first and second optocouplers are respectively connected between the detected relay, the power supply, and the detection signal. The first optocoupler is connected to each relay through a switch tube; two relays are used as a group, and the opening and closing action signals After the input end is connected in series with the opening and closing action signals, the action ends of the two relays are connected in series, the closing signal output end of one relay is connected to the second optocoupler, the closing signal output end of the other relay is grounded, and the second optocoupler outputs The detection signal is connected with the LED after being sequentially passed through the single chip microcomputer and the LED drive control special chip. The invention isolates the relay from the power supply, realizes accurate detection of the state of the internal relay of the scan switch while minimizing interference and power consumption; and uses a special circuit for LED drive control, which can drive all LED lights with one chip, simplifying the circuit , reduces wiring.
Description
technical field [0001] The invention relates to a relay state detection circuit, in particular to an isolated detection circuit for scanning the internal relay state of a switch. Background technique [0002] Scanning switches are widely used in testing and measurement industries, mainly for the measurement of precision electrical signals. Its main principle is to use the control signal to control the on-off of the magnetic latching relay, so as to achieve the effect of switching a certain channel on and off. The closing and opening control signals of the relay are controlled by the signals given by the relevant pins of the single-chip microcomputer. When many relays are used, since the power terminals of all relays are connected to the power supply at the same time, the action signal of one pin is likely to be Interference will be caused to the pins of other adjacent relays. Therefore, the on-off of many relays is prone to confusion caused by interference. Such as figur...
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IPC IPC(8): G01R31/327
Inventor 陈乐张存凯富雅琼谢敏王营
Owner CHINA JILIANG UNIV