Analog control device of current signal

Abstract

The utility model discloses an analog control device for current signals, which is characterized in that an upper computer is connected with a PLC (Programmable Logic Controller), the PLC is connected with a current conversion module, so that the PLC can receive a current signal output instruction sent by the upper computer, and a switching power supply supplies power to the PLC and the current conversion module; in the current conversion module, a voltage signal amplification assembly is connected with the PLC, and can receive a direct current voltage signal output by the PLC and amplify the direct current voltage signal; the voltage-controlled constant-current component can convert the direct-current voltage signal amplified by the voltage signal amplification component into a current signal and output the current signal to the current amplification component; the current amplification assembly can amplify a current signal sent by the voltage-controlled constant current assembly into a preset current and output the preset current. According to the technical scheme of the utility model, the output of the measuring range current required by the test is realized, and the analog control of the current signal is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit measurement, in particular to an analog control device for current signals. Background Art

[0002] At present, in the process of testing the controller, it is necessary to input the feedback signal of the controller voltage sensor so that the voltage sensor can convert the actual voltage of ±5kV into the current of ±50mA for output.

[0003] In actual operation, it is necessary to connect the actual voltage sensor. Since it is difficult to control high voltage, it may cause damage to the controller due to high voltage, which is costly and dangerous. Therefore, in the test process, in order to test the acquisition capability of the controller, it is necessary to simulate the output current signal of the sensor.

[0004] However, the existing current output modules generally have 0-20mA output or 4-20mA output, and the range is not sufficient to meet the test conditions, and it is impossible to test the controller's ability to collect current signals in a safe manner. Utility Model Content

[0005] In view of the above problems, the utility model provides an analog control device for current signals. Through the control instructions of the host computer to the PLC controller, the PLC controller can generate a DC voltage signal of a specific size, and then amplify the DC voltage signal through the voltage signal amplification component and the voltage-controlled constant current component. The voltage is converted into current, and finally the current is amplified to the required current through the current amplification component, thereby realizing the output of the current range required for the test and completing the analog control of the current signal.

[0006] To achieve the above object, the utility model provides a current signal simulation control device, comprising: a host computer, a PLC controller, a current conversion module and a switching power supply;

[0007] The host computer is connected to the PLC controller, and the PLC controller is connected to the current conversion module, so that the PLC controller can receive the current signal output instruction sent by the host computer, and the switching power supply supplies power to the PLC controller and the current conversion module;

[0008] The current conversion module comprises a voltage signal amplifying component, a voltage-controlled constant current component and a current amplifying component which are connected in sequence, wherein the voltage signal amplifying component is connected to the PLC controller, can receive a DC voltage signal output by the PLC controller, and amplify the DC voltage signal;

[0009] The voltage-controlled constant current component can convert the DC voltage signal amplified by the voltage signal amplifying component into a current signal and output it to the current amplifying component;

[0010] The current amplifying component can amplify the current signal sent by the voltage-controlled constant current component into a preset current and output it.

[0011] In the above technical solution, preferably, the voltage of the DC voltage signal output by the PLC controller is 0-10V.

[0012] In the above technical solution, preferably, the current amplifying component amplifies the current signal to 0-100mA.

[0013] In the above technical solution, preferably, the input of the switching power supply is connected to 220V, 50Hz AC mains.

[0014] In the above technical solution, preferably, the host computer and the PLC controller communicate with each other via RS485MODBUS protocol.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: through the control instructions of the host computer to the PLC controller, the PLC controller can generate a DC voltage signal of a specific size, and then amplify the DC voltage signal through the voltage signal amplification component and the voltage-controlled constant current component. The voltage is converted into current, and finally the current is amplified to the required current through the current amplification component, thereby realizing the output of the current range required for the test and completing the analog control of the current signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of the structure of a current signal simulation control device disclosed in an embodiment of the present invention.

[0017] In the figure, the corresponding relationship between each component and the reference numeral is as follows:

[0018] 1. Host computer, 2. PLC controller, 3. Current conversion module, 31. Voltage signal amplification component, 32. Voltage-controlled constant current component, 33. Current amplification component, 4. Switching power supply. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0021] like Figure 1 As shown, a current signal simulation control device provided by the utility model includes: a host computer 1, a PLC controller 2, a current conversion module 3 and a switching power supply 4;

[0022] The host computer 1 is connected to the PLC controller 2, and the PLC controller 2 is connected to the current conversion module 3, so that the PLC controller 2 can receive the current signal output instruction sent by the host computer 1, and the switch power supply 4 supplies power to the PLC controller 2 and the current conversion module 3;

[0023] The current conversion module 3 includes a voltage signal amplifying component 31, a voltage-controlled constant current component 32 and a current amplifying component 33 which are connected in sequence. The voltage signal amplifying component 31 is connected to the PLC controller 2, and can receive a DC voltage signal output by the PLC controller 2 and amplify the DC voltage signal.

[0024] The voltage-controlled constant current component 32 can convert the DC voltage signal amplified by the voltage signal amplifying component 31 into a current signal and output it to the current amplifying component 33;

[0025] The current amplifying component 33 can amplify the current signal sent by the voltage-controlled constant current component 32 into a preset current and output it.

[0026] In this embodiment, through the control instructions of the host computer 1 to the PLC controller 2, the PLC controller 2 can generate a DC voltage signal of a specific size, and then amplify the DC voltage signal through the voltage signal amplification component 31 and the voltage-controlled constant current component 32 to convert the voltage into current, and finally amplify the current to the required current through the current amplification component 33, thereby realizing the output of the current range required for the test and completing the analog control of the current signal.

[0027] Specifically, the voltage signal output end of the PLC controller 2 is connected to the signal input end of the current conversion module 3, and the signal output end of the current conversion module 3 outputs the current signal. Among them, the PLC controller 2 is connected to the host computer 1 for communication control, that is, when current signal simulation control is required, the host computer 1 sends a current signal output instruction to the PLC controller 2. The power interface of the PLC controller 2 and the power conversion module is connected to the output interface of the switching power supply 4, and is powered by the switching power supply 4.

[0028] In the above embodiment, preferably, the voltage range of the DC voltage signal output by the PLC controller 2 is 0-10V, and the output voltage is controlled according to the required current size.

[0029] In the above embodiment, preferably, the current amplifying component 33 amplifies the current signal to 0-100mA. According to the size of the DC voltage signal output by the PLC controller 2, after amplification and conversion into current, the required current signal in the range of 0-100mA can be obtained through amplification, and output as a current signal for simulating the test of the controller's acquisition capability.

[0030] In the above embodiment, preferably, the input of the switching power supply 4 is connected to 220V, 50Hz AC mains to provide a power source for the PLC controller 2 and the current conversion module 3 .

[0031] In the above implementation, preferably, the host computer 1 and the PLC controller 2 communicate with each other via the RS485MODBUS protocol to achieve the transmission of the current signal output instruction from the host computer 1 to the PLC controller 2 .

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A current signal simulation control device, characterized in that: include: Host computer, PLC controller, current conversion module and switching power supply; The host computer is connected to the PLC controller, and the PLC controller is connected to the current conversion module, so that the PLC controller can receive the current signal output instruction sent by the host computer, and the switching power supply supplies power to the PLC controller and the current conversion module; The current conversion module includes a voltage signal amplification component, a voltage-controlled constant current component and a current amplification component which are connected in sequence. The voltage signal amplification component is connected to the PLC controller, can receive a DC voltage signal output by the PLC controller, and amplify the DC voltage signal; The voltage-controlled constant current component can convert the DC voltage signal amplified by the voltage signal amplifying component into a current signal and output it to the current amplifying component; The current amplifying component can amplify the current signal sent by the voltage-controlled constant current component into a preset current and output it.

2. The analog control device for current signal according to claim 1, characterized in that: The voltage of the DC voltage signal output by the PLC controller is 0-10V.

3. The analog control device for current signal according to claim 1, characterized in that: The current amplifying component amplifies the current signal to 0-100mA.

4. The analog control device for current signal according to claim 1, characterized in that: The input of the switching power supply is connected to 220V, 50Hz AC mains.

5. The current signal simulation control device according to claim 1, characterized in that: The host computer communicates with the PLC controller via the RS485MODBUS protocol.

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