Valve control circuit and diagnosis circuit of valve control circuit
A valve control and diagnosis circuit technology, applied in the direction of program control, general control system, control/regulation system, etc., can solve problems such as inability to implement diagnosis faults, and achieve good real-time effect
Pending Publication Date: 2022-01-04
HANGZHOU HOLLYSYS AUTOMATION
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Problems solved by technology
[0005] The purpose of this application is to provide a valve control circuit and a diagnostic circuit of the valve control circuit, which are used to solve the problem that the fault diagnosis in the traditional valve control circuit is through the query mode between the MCU and the ADC, which leads to the failure to implement the fault diagnosis problem
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[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of this application.
[0032] The core of this application is to provide a valve control circuit and a diagnostic circuit for the valve control circuit, which are used to solve the problem that the fault diagnosis in the traditional valve control circuit is through the query mode between the MCU and the ADC, which leads to the failure to diagnose the fault.
[0033] In order to enable those skilled in the art to better understand the solution of the present application, the present appl...
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The invention discloses a valve control circuit and a diagnosis circuit of the valve control circuit, and relates to the field of circuit detection. The circuit comprises a first DAC, a voltage comparison circuit, a sampling resistor and a differential amplifier; the first DAC is connected with an MCU in the valve control circuit and used for converting data transmitted by the MCU to obtain a first voltage value. The differential amplifier is connected with the sampling resistor and is used for amplifying the voltage value of the sampling resistor to obtain a second voltage value; the input end of the voltage comparison circuit is connected with the first DAC and the differential amplifier, and the voltage comparison circuit is used for determining a diagnosis result according to the first voltage value and the second voltage value; the output end of the voltage comparison circuit is connected with an interrupt pin of the MCU. The circuit diagnoses a channel of the valve control circuit in real time through the voltage comparison circuit, and outputs a diagnosis result in an interruption triggering mode, so that the circuit has good real-time performance.
Description
technical field [0001] The application relates to the field of circuit detection, in particular to a valve control circuit and a diagnosis circuit for the valve control circuit. Background technique [0002] Most of the analog output modules (Analog Output Module, AO module) used to control and adjust valves in industry are 4-20mA current-type output modules. In safety instrumented systems, the requirements for module self-diagnosis are very high. figure 1 It is a structural schematic diagram of the traditional valve regulation circuit and its diagnostic circuit, such as figure 1 As shown, the principle of the current output AO module is mainly to configure the internal registers of the DAC through the digital interface between the Micro Control Unit (MCU) and the Digital-to-Analog Conversion (DAC). Different voltage values need to be output, and the voltage / current conversion circuit (V / I circuit) completes the conversion from voltage to current, so as to realize the con...
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IPC IPC(8): G05B23/02
CPCG05B23/0213G05B2219/24065
Inventor 袁国锋杜辉单辉
Owner HANGZHOU HOLLYSYS AUTOMATION