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Switching value signal control circuit and control method

A switching signal and control circuit technology, applied in electronic switches, electrical components, pulse technology, etc., can solve problems such as uncontrolled, switching signal malfunction, hazards, etc.

Pending Publication Date: 2020-09-11
HUNAN ZHONGKE ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is that the default states of the I / O ports of different microprocessors are different and uncontrolled during the power-on and power-off processes, so that the traditional switch signal control circuit is easy to generate the switch signal in the process In order to solve the problem of causing fatal harm to the stability, safety and reliability of the control system due to misoperation, a switch signal control circuit and control method are provided.

Method used

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  • Switching value signal control circuit and control method
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  • Switching value signal control circuit and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0071] How to ensure that the switching signal of the whole process can be output stably, reliably and safely is the key to reducing the misoperation of the industrial automation field control system.

[0072] The present invention provides a switching value signal control circuit, including a microprocessor 1, a first switching tube, and a relay 2. The microprocessor 1 has a first I / O interface, a second I / O interface, a third I / O interface, and a second I / O interface. O interface, the control end of the first switching tube is electrically connected to the first I / O interface, and a pair of normally open contacts (P1, P2) of the relay 2 are connected to the controlled circuit of the switch signal control circuit , the switch signal control circuit further includes a second switch tube and a switch tube drive unit. A pair of normally open contacts of the relay 2 are turned on or off, so that the controlled circuit is turned on or off.

[0073] The first switch tube, the seco...

Embodiment 2

[0095] As shown in Figure 2(b), the difference between Embodiment 2 and Embodiment 1 is that the triode T1, triode T2, and triode T3 are NPN type, NPN type, and PNP type respectively, and the collector C1 of the triode T1 The emitter E1 and the emitter E1 of the triode T2 are electrically connected to the ground GND respectively, and the collector C2 of the triode T2 is electrically connected to the first power supply terminal VCC through the coil of the relay 2 .

[0096] In Embodiment 2, through the structures of the triode T1, the triode T2, and the triode T3 and the above-mentioned connection relationship, it is possible to:

[0097] (A1) When the outputs of the second I / O interface I / O2 and the third I / O interface I / O3 are both at high level, the transistor T3 is turned off, so that the transistor T2 is turned off, so that the relay 1 A pair of normally open contacts cannot be connected, so as to avoid malfunctions caused by the uncertain and uncontrolled state of the I / O...

Embodiment 3

[0103] As shown in Figure 2(c), the difference between Embodiment 3 and Embodiment 1 is that the triode T1, triode T2, and triode T3 are PNP type, PNP type, and NPN type respectively, and the collector of the triode T1 passes through The coil of the relay 2 is electrically connected to the ground GND, and the collector and emitter of the triode T2 are respectively electrically connected to the emitter of the triode T1 and the first power supply terminal VCC.

[0104] (A1) When the output of the second I / O interface and the third I / O interface are both at high level, the transistor T3 is turned off, so that the transistor T2 is turned off, so that a pair of normally open contacts of the relay 1 The points cannot be connected, so as to avoid the misoperation caused by the uncertain and uncontrolled state of the I / O after the microprocessor is just started;

[0105] (B1) When the output of the second I / O interface and the third I / O interface are both at low level, the transistor ...

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Abstract

The invention provides a switching value signal control circuit and a switching value signal control method. The switching value signal control circuit comprises a microprocessor, a first switching tube and a relay; the microprocessor is provided with a first I / O interface, a second I / O interface and a third I / O interface. The control end of the first switch tube is electrically connected with thefirst I / O interface; a pair of normally open contacts of the relay are connected in a controlled circuit of the switching value signal control circuit, the switching value signal control circuit further comprises a second switching tube and a switching tube driving unit, and the first switching tube, the second switching tube and a relay coil are electrically connected between a first power supply end and the ground in series; the switching tube driving unit is provided with a first end electrically connected with the third I / O interface, a second end electrically connected with the control end of the second switching tube, and a third end electrically connected with the second I / O interface. According to the invention, the risk of misoperation caused by the fact that the first I / O interface outputs an unexpected default level signal can be avoided, and the relay can be safely controlled.

Description

technical field [0001] The invention relates to the field of industrial automation control, and specifically designs a circuit and method for reliable output of switching signal. Background technique [0002] As the country enters the era of industrial 4.0 information intelligence, unmanned, automated, digital and intelligent control has become the most important development trend in the field of industrial field control in recent years, and has penetrated into almost every field of industrial control field. Manned workshops, unmanned restaurants and other application places; unmanned, automated, digital and intelligent control is based on the acquisition and output of a reliable and stable on-site control system, which requires the precision and accuracy of automatic control Higher and higher, such as analog acquisition, digital input signal acquisition, digital signal output control and so on. [0003] The main schematic diagrams of the traditional switch signal output co...

Claims

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Application Information

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IPC IPC(8): H03K17/94
CPCH03K17/94
Inventor 汪亮袁鹏王文宇李爱武刘勇邹志强解苗唐赛朱晶亮肖红
Owner HUNAN ZHONGKE ELECTRIC
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