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An output circuit and method of a switch signal

A technology of switching signal and output circuit, which is applied in the direction of program control, instrument, computer control, etc., can solve problems such as misoperation and switching signal output error, and achieve the effect of avoiding misoperation and improving safety and reliability

Active Publication Date: 2021-02-09
ZHEJIANG SUPCON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For automatic control systems with continuous working capability controlled by switching signals, such as continuous working automatic switching systems or continuous working automatic temperature control systems, etc., the output of switching signals is often affected by equipment aging, external environmental interference, etc. Due to the influence of uncertain factors, output errors occur. After the last control operation of the automatic control system is completed, if the switch signal output of the next control operation is wrong, this may cause the next control of the automatic control system Misoperation in the job

Method used

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  • An output circuit and method of a switch signal
  • An output circuit and method of a switch signal
  • An output circuit and method of a switch signal

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Experimental program
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Effect test

Embodiment 1

[0045]Embodiment 1 of the present application provides a switching signal output circuit, which will be described in detail below with reference to the accompanying drawings.

[0046] see figure 1 , which is a schematic diagram of an output circuit of a switching signal provided in Embodiment 1 of the present application.

[0047] The circuit described in the embodiment of the present application is applied to a continuous working automatic control system, such as a continuous working automatic switch control system or a continuous working automatic temperature control system, etc., and the switching signal is used to control the control operation of the automatic control system . This application does not specifically limit the switch signal.

[0048] The circuit includes: a processor 101 , a controller 102 , a control switch 103 , a diagnosis switch 104 , a voltage follower 105 and an analog-to-digital converter 106 .

[0049] The first end of the control switch 103 is co...

Embodiment 2

[0069] Embodiment 2 of the present application also provides another output circuit for switching signal, which will be described in detail below with reference to the accompanying drawings.

[0070] see figure 2 , which is a schematic diagram of another switching signal output circuit provided in Embodiment 2 of the present application.

[0071] The processor described in the embodiment of the present application is a microprocessor MCU203, and the controller is a complex programmable logic device CPLD202. On the basis of the circuit described in Embodiment 1, the circuit described in this embodiment also includes: a voltage divider circuit 207 and diode 208 .

[0072] The control switch in this embodiment of the application is the first NMOS transistor 203; the diagnostic switch is the second NMOS transistor 204; the gate of the first NMOS transistor 203 and the gate of the second NMOS transistor 204 are connected to the The controller is connected; the drain of the first...

Embodiment 3

[0091] Based on the output circuit of the switching signal provided by the above embodiments, Embodiment 3 of the present application also provides a method for outputting the switching signal, which will be described in detail below with reference to the accompanying drawings.

[0092] see image 3 , which is a flow chart of a switching signal output method provided in Embodiment 3 of the present application.

[0093] The method described in the embodiment of the present application can be applied to the circuit described in any one of the above embodiments, and the method includes the following steps:

[0094] S101: within the first judging time, make the processor send a first state signal to the controller to control the control switch and the diagnostic switch to be closed, and judge whether the output signal of the analog-to-digital converter is consistent with a preset Whether the output signals are consistent, if not, it is judged that the control switch and / or the di...

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Abstract

The invention provides a switching value signal output circuit and method. The first end of a control switch of the circuit is connected with a switching value signal input end, and the second end ofthe control switch is connected with the first end of a diagnosis switch; the second end of the diagnosis switch serves as a switching value signal output end; the first end of a voltage follower is connected with the second end of the diagnosis switch, and the second end of the voltage follower is connected with the input end of an analog-digital converter; the output end of the analog-digital converter is connected with a processor; the processor sends a state signal to a controller within a preset time and judges whether or not the control switch and the diagnosis switch have a fault according to an output signal of the analog-digital converter and a preset output signal within the preset time; the controller controls the working state of the control switch and the diagnosis switch according to the status signal. By means of the circuit, whether or not a switching value signal output fault occurs can be diagnosed in time, misoperation caused by a switching value signal output erroris avoided, and the safety and reliability of an automatic control system are improved.

Description

technical field [0001] The present application relates to the technical field of industrial control, in particular to an output circuit and method of a switch signal. Background technique [0002] With the advancement of industrial automation, the concept of automatic control has penetrated into various fields of industry, such as automatic adjustment of liquid level and temperature, etc. The demand for automatic control in industrial control sites is increasing, and the precision and accuracy of automatic control The requirements for precision are getting higher and higher, and at the same time, the problems brought about by automatic control have also received more and more attention. [0003] The change of the switching signal is not continuous, but jumping. Compared with the analog signal, it has the characteristics of strong anti-interference ability, so the switching signal is often used as the control signal of the automatic control system. For automatic control syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCG05B19/0425G05B2219/21152
Inventor 来晓徐士斌江竹轩
Owner ZHEJIANG SUPCON TECH