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Switch quantity acquisition circuit

A switch value acquisition and circuit technology, applied in the field of switch value acquisition circuit, can solve the problems of poor signal acquisition effect, low accuracy, acquisition failure, etc., and achieve the effect of good reading, secondary control and good stability

Inactive Publication Date: 2018-11-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of acquisition method is not only less accurate, but also has a poor effect on weak switch signal acquisition, and may fail to acquire due to various interferences, so it needs to be improved

Method used

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Embodiment 2

[0019] Embodiment 2, on the basis of embodiment 1, designed specific circuit diagram, as figure 2 As shown in the figure, the isolated input module includes a triode V1, a diode D1 and a triode V2. The signal of the electronic switch triggers the triode V1 to conduct. The signal is input to the voltage negative feedback module. The existence of resistors R1 and R2 can prevent self-excitation, and they are also input resistors. Capacitor C1 can prevent high-frequency interference from mixed signals, and short-circuit it when encountering high-frequency interference. Capacitor C2 is a signal coupling capacitor. The previous chip IC1 constitutes a voltage negative feedback circuit, R3 and R4 are feedback resistors, and the feedback voltage is sent to the inverting terminal of the chip IC1. C3 plays the role of frequency compensation: when the frequency is high, the capacitive reactance of C3 decreases, the total impedance of C3 and R3 decreases, and the feedback amount decrease...

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Abstract

The invention discloses a switch quantity acquisition circuit, which comprises an isolation input module, a direct current power supply module, a voltage negative feedback circuit and a reverse proportional amplifier, wherein the input end of the direct current power supply module is connected with the alternating commercial electricity; the output end of the direct current power supply module isrespectively connected with the isolation input module, the voltage negative feedback circuit and the reverse proportional amplifier, the isolation input module is also respectively connected with anelectronic switch, the voltage negative feedback module is also connected with the reverse proportional amplifier; and the reverse proportional amplifier is also connected with an output port. According to the invention, the electrical isolation function is provided, the isolation input module collects the switch quantity signal sent by the electronic switch and transmits the switch quantity signal to the voltage negative feedback module for primary amplification, the switch quantity signal output from the voltage negative feedback module enters the reverse proportional amplifier again for secondary amplification, the amplified switch quantity signal is output through the output port, the signal is amplified twice, the stability is good, and the reading and secondary control are facilitated.

Description

technical field [0001] The invention relates to a signal acquisition circuit, in particular to a switching value acquisition circuit. Background technique [0002] In the industrial control system, the switch value refers to the value corresponding to the on or off of the controlled relay. Before the controller issues instructions, it is necessary to obtain the status information of the current controlled object, that is, to obtain the switch signal. Under normal circumstances, it is necessary to electrically isolate the collected switching signal, otherwise the accuracy of the collected signal may be affected by the voltage fluctuation on the high-voltage electrical side. [0003] The switching value acquisition circuit in the prior art is mostly implemented with a low-cost optocoupler. This kind of acquisition method not only has low accuracy, but also has a poor effect on weak switch signal acquisition, and may fail to acquire due to various interferences, so it needs t...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 董子健苑朝曾德志张抖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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