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A current output self-diagnosis circuit

A technology for diagnosing circuits and currents, applied in electrical testing/monitoring, measurement using digital measurement technology, etc., can solve problems such as low reliability requirements of output circuits, low reliability of output signals, failure to capture current output circuit failures in time, etc. , to achieve the effect of improving reliability

Active Publication Date: 2018-10-02
STATE NUCLEAR POWER AUTOMATION SYST ENGCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of general industrial control, the reliability of the output circuit is often not high. Generally, only the current output control is realized, and the failure of the current output circuit cannot be captured in time, so the reliability of the output signal is low.

Method used

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  • A current output self-diagnosis circuit

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Embodiment Construction

[0009] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

[0010] Such as figure 1 As shown, a current output self-diagnosis circuit provided by the embodiment of the present invention includes a current output transmission module U1, the power input terminal of the current output transmission module U1 is connected to an external power supply C4, and the current output transmission module U1 The current output control terminal is connected to an external control signal F2, and it is characterized in that: it also includes a differential voltage to current module U2 and an analog-to-digital conversion module U3;

[0011] The external power supply C4 is connected to the power input ter...

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Abstract

The invention provides a current output self-diagnosis circuit, relates to the technical field of the current output self-diagnosis circuit, and solves the technical problem of enhancement of output signal reliability. The circuit comprises a current output transmitting module. The power supply input end of the current output transmitting module is connected with an external power supply. The current output control end of the current output transmitting module is connected with an external control signal. The current output self-diagnosis circuit is characterized by further comprising a differential voltage-to-current module and an analog-to-digital conversion module. The external power supply is connected with the power supply input end of the current output transmitting module via a differential voltage sampling resistor. The two differential voltage input ends of the differential voltage-to-current module are respectively connected with the two ends of the differential voltage sampling resistor. The output end of the differential voltage-to-current module is connected with the analog signal input end of the analog-to-digital conversion module. The feedback voltage output end of the analog-to-digital conversion module is connected with the output end of the differential voltage-to-current module via a feedback sampling resistor. The circuit is high in output signal reliability.

Description

technical field [0001] The invention relates to industrial control technology, in particular to a technology of current output self-diagnosis circuit. Background technique [0002] As a conventional output mode, the current output channel generally exists in various DCS systems and PLC systems. Its conventional structure is to use a current output transmission module to realize current output control, and the power input terminal of the current output transmission module is connected to an external power supply. , the current output control terminal of the current output transmission module is connected with an external control signal. However, in the field of general industrial control, the reliability of the output circuit is often not high. Generally, only the current output control is realized, and the failure of the current output circuit cannot be captured in time, so the reliability of the output signal is low. Contents of the invention [0003] Aiming at the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G05B23/02
Inventor 王佳承查章其韩寅驰张科张建春徐沧蒋磊
Owner STATE NUCLEAR POWER AUTOMATION SYST ENGCO
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