Module for judging D.C. voltage switching quantitative input state

A technology of DC voltage switch and input status, which is applied in the field of DC voltage switch input status judgment module to achieve the effect of satisfying power consumption, low power consumption and ensuring accuracy

Active Publication Date: 2005-01-05
GUODIAN NANJING AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent has the characteristics of high measurement accuracy, good linearity and stable and reliable work, but because it is mainly used to isolate and measure the DC voltage of the microcomputer co

Method used

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  • Module for judging D.C. voltage switching quantitative input state
  • Module for judging D.C. voltage switching quantitative input state
  • Module for judging D.C. voltage switching quantitative input state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The DC voltage switch input state judging module of this embodiment is as follows: figure 2 As shown, it is mainly based on the constant current source technology in analog electronics, and is composed of an optocoupler IC, a pre-transistor T, a voltage regulator tube, and a resistor. The front end of the optocoupler IC inputs a DC voltage signal through the first resistor R1, the negative pole of the front end is connected to the collector of the pre-transistor T, and the rear end of the optocoupler IC outputs a judgment result signal through the Schmitt trigger A. The emitter of the pre-transistor T is grounded through the emitter resistor RE, the base of the pre-transistor T is connected to the base resistor RB, and a voltage regulator tube V1 and a series connection are connected between the DC voltage signal input terminal and the base resistor RB. Divider resistor RV. The connection between the base resistor RB and the voltage dividing resistor RV is grounded th...

Embodiment 2

[0035] The above exemplifies the working circuit of the DC digital input judging module when the digital input voltage level is 110V. In order to make it conveniently applicable to the environment where the digital input voltage level is 220V, this embodiment is for example image 3 As shown, the series voltage regulator tube V1' and resistor RV' with the same parameters as the original voltage regulator tube V1 and resistor RV' are added. In this way, the purpose is achieved, and the cost and complexity of production are also saved.

Embodiment 3

[0037] This embodiment is a technical solution further refined and perfected on the basis of the above embodiments, such as Figure 4 As shown, its specific improvements are:

[0038] A protective diode D is added to the DC voltage signal input to avoid accidental reverse voltage from destroying the working circuit. A subsequent current-limiting resistor R is connected in series behind the protection diode D so that the current flowing through the working circuit will not be too large.

[0039] A high-voltage capacitor CH is connected in parallel after the protection diode D at the input terminal of the DC voltage signal and the subsequent current-limiting resistor R to absorb the AC component generated by the instantaneous large voltage disturbance of the switching input voltage.

[0040] Next to the high-voltage capacitor CH, a fast transient diode DQ with high withstand voltage level is connected in parallel to absorb the sudden increase of transient large current caused b...

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Abstract

This invention relates to a DC voltage switch volume input state judgment module including a first resistor and light couple of judgment result signals output from the back end and a pre-triode, among which, the first resistor is connected with the light couple front end positive which negative is linked to the collector of the pre-triode which emitting pole is connected to the earth via the emitting pole, the base of which is linked to a base resistor, a serial VR-tube and a divider resistor between the DC voltage signal input end and the base resistor connecting with the divider to the earth via another parallel VR-tube and a current limiting resistor.

Description

technical field [0001] The invention relates to a DC voltage switch value input state judging module, which belongs to the technical field of industrial automation control. Background technique [0002] In the process of industrial automation control, it is often necessary to send a digital input signal to the automatic device through a DC voltage, so as to adjust the operating state of the automatic device according to the presence or absence of the digital input signal. [0003] As far as the applicant knows, the existing modules of this type mainly use figure 1 The circuit realizes the judgment of the input state of the DC voltage switch value. Its working principle is: the voltage drop of the DC voltage Vi on the R1 resistor generates the optocoupler front-end current If, which drives the optocoupler IC. When Vi is 0V, If=0, the optocoupler is not conducting, and the Di signal at the rear end of the optocoupler is high level; when Vi is added to the rated forward volta...

Claims

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Application Information

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IPC IPC(8): H03K17/78
Inventor 尹秋帆王翀
Owner GUODIAN NANJING AUTOMATION
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