Servo control isolation device

Abstract

The utility model relates to the field of servo control isolation, in particular to a servo control isolation device, which improves the stability and the precision of a control system. According to the scheme, the device comprises a control module, a valve position detection isolation module, a current output isolation module and a voltage output isolation module, wherein the valve position detection isolation module, the current output isolation module and the voltage output isolation module are respectively connected with the control module; the valve position detection and isolation module comprises a first operational amplifier (U903B) and a first isolation amplifier (U905), the in-phase input end of the first operational amplifier (U903B) receives an input valve position voltage signal, the inverted input end of the first operational amplifier (U903B) is connected with the output end, the output end is connected with a second pin of the first isolation amplifier (U905), and the first isolation amplifier (U905) is connected with the second pin of the first operational amplifier (U903B). A second pin of the first isolation amplifier (U905) is connected with a third pin of the first isolation amplifier (U905), a first pin of the first isolation amplifier (U905) is connected with a first voltage reference source (B5V), and a seventh pin of the first isolation amplifier (U905) is connected with an ADC part embedded in the control module. The servo control isolation circuit is suitable for servo control isolation.

Description

Technical Field

[0001] The utility model relates to the field of servo control isolation, and particularly relates to a servo control isolation device. Background Art

[0002] A servo module is a feedback control system used to accurately follow or reproduce a certain process, and is also known as a servo system or a follow-up system. Such a system can make the output controlled variables such as the position, orientation, and state of an object follow any change of an input target (or a given value). The main tasks of the servo system include amplifying, transforming, and regulating power according to the requirements of a control command, so that the torque, speed, and position output by a driving device can be controlled very flexibly and conveniently. However, its valve position signal is easily affected by external environmental factors such as electromagnetic interference and mechanical vibration, which can disturb the signal and affect the stability and accuracy of the control system. At the same time, its current output and voltage output are easily affected by the interference caused by the ground loop current, which affects the stability and accuracy of the control system. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art, and provide a servo control isolation device, which realizes the isolation of the valve position signal and the control signal, and improves the stability and accuracy of the control system.

[0004] The utility model adopts the following technical solutions to achieve the above purpose. The utility model provides a servo control isolation device, which includes a control module, a valve position detection isolation module, a current output isolation module, and a voltage output isolation module. The valve position detection isolation module, the current output isolation module, and the voltage output isolation module are respectively connected to the control module. The valve position detection isolation module includes a first operational amplifier U903B and a first isolation amplifier U905. The non-inverting input terminal of the first operational amplifier U903B receives the input valve position voltage signal. The inverting input terminal of the first operational amplifier U903B is connected to the output terminal. The output terminal of the first operational amplifier U903B is connected to the second pin of the first isolation amplifier U905. The second pin of the first isolation amplifier U905 is connected to the third pin of the first isolation amplifier U905. The first pin of the first isolation amplifier U905 is connected to the first voltage reference source B5V. The seventh pin of the first isolation amplifier U905 is connected to the ADC (Analog-to-Digital Converter) part embedded in the control module.

[0005] Furthermore, the valve position detection isolation module further includes a first resistor R929 and a second resistor R930. The output terminal of the first operational amplifier U903B is connected to the second pin of the first isolation amplifier U905 through the first resistor R929. The second pin of the first isolation amplifier U905 is connected to the third pin of the first isolation amplifier U905 through the second resistor R930.

[0006] Furthermore, the current output isolation module includes a second isolation amplifier U900, a second operational amplifier U901A, and a triode Q900. The second pin of the second isolation amplifier U900 is connected to the DAC (Digital-to-Analog Converter) part embedded in the control module. The second pin of the second isolation amplifier U900 is connected to the third pin of the second isolation amplifier U900. The first pin of the second isolation amplifier U900 is connected to the first voltage reference source B5V. The seventh pin of the second isolation amplifier U900 is connected to the non-inverting input terminal of the second operational amplifier U901A. The sixth pin of the second isolation amplifier U900 is connected to the inverting input terminal of the second operational amplifier U901A. The output terminal of the second operational amplifier U901A is connected to the base of the triode Q900. The collector of the triode Q900 is connected to the second voltage reference source B24V. The emitter of the triode Q900 is respectively connected to the inverting input terminal and the non-inverting input terminal of the second operational amplifier U901A.

[0007] Furthermore, the current output isolation module further includes a third resistor R902 and a fourth resistor R903. The seventh pin of the second isolation amplifier U900 is connected to the non-inverting input terminal of the second operational amplifier U901A through the third resistor R902. The sixth pin of the second isolation amplifier U900 is connected to the inverting input terminal of the second operational amplifier U901A through the fourth resistor R903.

[0008] Furthermore, the voltage output isolation module includes a third isolation amplifier chip U77, a third operational amplifier U69A, and a fourth operational amplifier U69B. The sixth and seventh pins of the third isolation amplifier chip U77 receive the input analog signal. The second pin of the third isolation amplifier chip U77 is respectively connected to the output terminal and the inverting input terminal of the third operational amplifier U69A. The third pin of the third isolation amplifier chip U77 is respectively connected to the output terminal and the inverting input terminal of the fourth operational amplifier U69B. The non-inverting input terminal of the third operational amplifier (U69A) is connected to the positive current input terminal (AIN_P1). The non-inverting input terminal of the fourth operational amplifier (U69B) is connected to the negative current input terminal (AIN_N1).

[0009] Furthermore, the isolation device further includes a power supply module J2, a first capacitor C249, and a second capacitor C251. The first pin of the power supply module J2 is connected to the second pin of the power supply module J2 through the first capacitor C249. The second pin of the power supply module J2 is connected to the first power supply VCC_5V. The third pin of the power supply module J2 is connected to the fourth pin of the power supply module J2 through the second capacitor C251.

[0010] Further, the isolation device further includes a third capacitor C252 and a fourth capacitor C253, and the voltages provided by the power supply module J2 are grounded through the third capacitor C252 and the fourth capacitor C253 respectively.

[0011] Advantages of the present utility model:

[0012] The present utility model uses a valve position detection isolation module to achieve the isolation of the valve position signal and the control signal, avoiding the disturbance of signals caused by external environmental factors such as electromagnetic interference and mechanical vibration, and improving the stability and accuracy of the control system.

[0013] The present utility model uses a current output isolation module to physically isolate the current output and the control circuit, avoiding the interference caused by the ground loop current from affecting the stability and accuracy of the control system.

[0014] The present utility model uses a voltage output isolation module to physically isolate the voltage output and the control circuit, avoiding the interference caused by the ground loop current from affecting the stability and accuracy of the control system. Description of the drawings

[0015] Figure 1 is a structural block diagram of a servo control isolation device provided by an embodiment of the present utility model;

[0016] Figure 2 is a schematic circuit diagram of a voltage output isolation module provided by an embodiment of the present utility model;

[0017] Figure 3 is a schematic circuit diagram of a valve position detection isolation module provided by an embodiment of the present utility model;

[0018] Figure 4 is a schematic circuit diagram of a current output isolation module provided by an embodiment of the present utility model;

[0019] In the drawings, U903B is the first operational amplifier, U905 is the first isolation amplifier, U900 is the second isolation amplifier, U901A is the second operational amplifier, Q900 is the triode, U77 is the third isolation amplifier chip, U69A is the third operational amplifier, and U69B is the fourth operational amplifier. Detailed implementation manners

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

[0021] Such as Figure 1As shown in the figure, the present utility model provides a servo control isolation device, which includes a control module, a valve position detection isolation module, a current output isolation module, and a voltage output isolation module. The valve position detection isolation module, the current output isolation module, and the voltage output isolation module are respectively connected to the control module.

[0022] The ADC and DAC components embedded in the control module of the present utility model realize the detection of the valve position signal and the servo control output.

[0023] As Figure 3 shown, the figure is a circuit structure of a valve position detection isolation module provided by an embodiment of the present utility model. The valve position detection isolation module includes a first operational amplifier U903B, a first isolation amplifier U905, a resistor R927, a resistor R928, a resistor R929, a resistor R930, and a resistor R931. The non-inverting input terminal of the first operational amplifier U903B receives the input valve position voltage signal through the resistor R927 and is grounded through the resistor R928. The inverting input terminal of the first operational amplifier U903B is connected to the output terminal. The output terminal of the first operational amplifier U903B is connected to the second pin of the first isolation amplifier U905 through the resistor R929. The second pin of the first isolation amplifier U905 is connected to the third pin of the first isolation amplifier U905 through the resistor R930. The first pin of the first isolation amplifier U905 is connected to the first voltage reference source B5V. The seventh pin of the first isolation amplifier U905 is connected to the ADC part embedded in the control module.

[0024] As Figure 4As shown in the figure, it is a circuit structure of a current output isolation module provided by an embodiment of the present invention. The current output isolation module includes a second isolation amplifier U900, a second operational amplifier U901A, a triode Q900, resistors R900, R901, R902, R903, R904, R905, R906, and R907. The second pin of the second isolation amplifier U900 is connected to the DAC part embedded in the control module through the resistor R900, and the second pin of the second isolation amplifier U900 is connected to the third pin of the second isolation amplifier U900 through the resistor R901. The first pin of the second isolation amplifier U900 is connected to the first voltage reference source B5V. The seventh pin of the second isolation amplifier U900 is connected to the non-inverting input terminal of the second operational amplifier U901A through the resistor R902. The sixth pin of the second isolation amplifier U900 is connected to the inverting input terminal of the second operational amplifier U901A through the resistor R903. The output terminal of the second operational amplifier U901A is connected to the base of the triode Q900 through the resistor R904. The collector of the triode Q900 is connected to the second voltage reference source B24V. The emitter of the triode Q900 is connected to the inverting input terminal of the second operational amplifier U901A through the resistor R905. The emitter of the triode Q900 is also connected to the non-inverting input terminal of the second operational amplifier U901A through the resistors R907 and R906.

[0025] As Figure 2 shown in the figure, it is a circuit structure of a voltage output isolation module provided by an embodiment of the present invention. The voltage output isolation module includes a third isolation amplifier chip U77, a third operational amplifier U69A, a fourth operational amplifier U69B, resistors R309, R310, R313, R315, R317, R318, and a capacitor C257. The sixth and seventh pins of the third isolation amplifier chip U77 receive the input analog signal. The second pin of the third isolation amplifier chip U77 is respectively connected to the output terminal and the inverting input terminal of the third operational amplifier U69A. The third pin of the third isolation amplifier chip U77 is respectively connected to the output terminal and the inverting input terminal of the fourth operational amplifier U69B.

[0026] The non-inverting input terminal of the third operational amplifier U69A is connected to the positive current input terminal AIN_P1 through the resistors R309 and R310. The non-inverting input terminal of the third operational amplifier U69A is also grounded through the resistor R313 and the capacitor C257.

[0027] The non-inverting input terminal of the fourth operational amplifier U69B is connected to the negative current input terminal AIN_N1 through the resistors R317 and R318. The non-inverting input terminal of the fourth operational amplifier U69B is also grounded through the resistor R315 and the capacitor C257.

[0028] In an embodiment of the present utility model, the power supply module adopts B0505S. The first pin of the power supply module J2 is connected to the second pin of the power supply module J2 through the first capacitor C249. The second pin of the power supply module J2 is connected to the first power supply VCC_5V. The third pin of the power supply module J2 is connected to the fourth pin of the power supply module J2 through the second capacitor C251.

[0029] In an embodiment of the present utility model, the isolation device further includes a third capacitor C252 and a fourth capacitor C253. After isolation, the power supply 5V_ISO1 on the field side is grounded through the third capacitor C252 and the fourth capacitor C253 respectively. The third capacitor C252 and the fourth capacitor C253 are used to filter the power supply provided for the power supply module.

[0030] The valve position detection isolation module of the present utility model realizes that the sensor analog current signal input is first converted into a voltage signal and then into a digital signal and provided to the control module; the controller module can control the output of a voltage-type or current-type analog signal.

[0031] The above are only the preferred embodiments of the present utility model. It should be understood that the present utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments. Instead, it can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. As long as the changes and variations made by those skilled in the art do not depart from the spirit and scope of the present utility model, they should all be within the protection scope of the appended claims of the present utility model.

Claims

1. A servo control isolation device, characterized in that, It includes a control module, a valve position detection isolation module, a current output isolation module, and a voltage output isolation module. The valve position detection isolation module, the current output isolation module, and the voltage output isolation module are respectively connected to the control module. The valve position detection isolation module includes a first operational amplifier (U903B) and a first isolation amplifier (U905). The non-inverting input terminal of the first operational amplifier (U903B) receives the input valve position voltage signal. The inverting input terminal of the first operational amplifier (U903B) is connected to the output terminal. The output terminal of the first operational amplifier (U903B) is connected to the second pin of the first isolation amplifier (U905). The second pin of the first isolation amplifier (U905) is connected to the third pin of the first isolation amplifier (U905). The first pin of the first isolation amplifier (U905) is connected to the first voltage reference source (B5V). The seventh pin of the first isolation amplifier (U905) is connected to the ADC part embedded in the control module.

2. The servo control isolation device according to claim 1, wherein The valve position detection isolation module further includes a first resistor (R929) and a second resistor (R930). The output terminal of the first operational amplifier (U903B) is connected to the second pin of the first isolation amplifier (U905) through the first resistor (R929). The second pin of the first isolation amplifier (U905) is connected to the third pin of the first isolation amplifier (U905) through the second resistor (R930).

3. The servo control isolation device according to claim 1, wherein The current output isolation module includes a second isolation amplifier (U900), a second operational amplifier (U901A), and a triode (Q900). The second pin of the second isolation amplifier (U900) is connected to the DAC part embedded in the control module. The second pin of the second isolation amplifier (U900) is connected to the third pin of the second isolation amplifier (U900). The first pin of the second isolation amplifier (U900) is connected to the first voltage reference source (B5V). The seventh pin of the second isolation amplifier (U900) is connected to the non-inverting input terminal of the second operational amplifier (U901A). The sixth pin of the second isolation amplifier (U900) is connected to the inverting input terminal of the second operational amplifier (U901A). The output terminal of the second operational amplifier (U901A) is connected to the base of the triode (Q900). The collector of the triode (Q900) is connected to the second voltage reference source (B24V). The emitter of the triode (Q900) is respectively connected to the inverting input terminal and the non-inverting input terminal of the second operational amplifier (U901A).

4. The servo control isolation device according to claim 3, wherein, The current output isolation module further includes a third resistor (R902) and a fourth resistor (R903). The seventh pin of the second isolation amplifier (U900) is connected to the non-inverting input terminal of the second operational amplifier (U901A) through the third resistor (R902). The sixth pin of the second isolation amplifier (U900) is connected to the inverting input terminal of the second operational amplifier (U901A) through the fourth resistor (R903).

5. The servo control isolation device according to claim 1, characterized in that, The voltage output isolation module includes a third isolation amplifier chip (U77), a third operational amplifier (U69A), and a fourth operational amplifier (U69B). The sixth and seventh pins of the third isolation amplifier chip (U77) receive the input analog signal. The second pin of the third isolation amplifier chip (U77) is respectively connected to the output terminal and the inverting input terminal of the third operational amplifier (U69A). The third pin of the third isolation amplifier chip (U77) is respectively connected to the output terminal and the inverting input terminal of the fourth operational amplifier (U69B). The non-inverting input terminal of the third operational amplifier (U69A) is connected to the positive current input terminal (AIN_P1). The non-inverting input terminal of the fourth operational amplifier (U69B) is connected to the negative current input terminal (AIN_N1).

6. The servo control isolation device according to claim 1, wherein The isolation device further includes a power supply module (J2), a first capacitor (C249), and a second capacitor (C251). The first pin of the power supply module (J2) is connected to the second pin of the power supply module (J2) through the first capacitor (C249). The second pin of the power supply module (J2) is connected to the first power supply (VCC_5V). The third pin of the power supply module (J2) is connected to the fourth pin of the power supply module (J2) through the second capacitor (C251).

7. The servo control isolation device according to claim 6, wherein The isolation device further includes a third capacitor (C252) and a fourth capacitor (C253). The voltages provided by the power supply module (J2) are respectively grounded through the third capacitor (C252) and the fourth capacitor (C253).

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