Electrical signal transmission system

Abstract

The utility model relates to an electric signal transmission system, which is characterized by comprising an anti-interference module, a protection voltage circuit and a voltage comparison module, the input end of the anti-interference module is electrically connected with the output end of the digital-to-analog converter; the output end of the anti-interference module and the protection voltage circuit are electrically connected with the input end of the voltage comparison module; the anti-interference module comprises a voltage division circuit, an operational amplifier and a filter circuit; the output end of the digital-to-analog converter is electrically connected with the input end of the operational amplifier through the voltage division circuit; the output end of the operational amplifier is electrically connected with the processor through the filter circuit. The operational amplifier has the functions of isolation protection and voltage following, the output of the operational amplifier is output to the filter circuit, and the high-frequency part is short-circuited by the capacitor, so that high-frequency noise or ripples are filtered out, and electronic components are protected from being influenced by voltage interference. The output voltage is more stable, so that the processor can stably acquire the voltage signal.

Description

Technical Field

[0001] The present application relates to the technical field of electrical signal anti-interference, and in particular to an electrical signal transmission system. Background Art

[0002] ADC refers to analog / digital conversion or digital / analog conversion, which achieves the conversion between electrical analog quantity and digital quantity. At present, the acquisition method is that the sensor measures various physical parameters (temperature, humidity, pressure, etc.), converts them into the required electrical signals and sends them directly to the CPU or ADC chip pins. However, in actual projects, interference signals will be generated due to power supply signals, magnetic fields, devices, etc., which will not only affect the normal operation of electronic components, but also cause the electrical signals to generate high-frequency signals or ripples in the process of being sent to the CPU or ADC chip pins, resulting in a large error between the collected voltage value and the theoretical voltage value.

[0003] How to reduce the impact of signal interference during electrical signal transmission has become an urgent problem that needs to be solved. Summary of the invention

[0004] In view of this, the present application proposes an electrical signal transmission system suitable for avoiding the influence of signal interference during the electrical signal transmission process.

[0005] According to one aspect of the present application, there is provided an electrical signal transmission system, characterized in that it comprises: an anti-interference module, a protection voltage circuit and a voltage comparison module;

[0006] The input end of the anti-interference module is electrically connected to the output end of the digital-to-analog converter; the output end of the anti-interference module and the protection voltage circuit are both electrically connected to the input end of the voltage comparison module;

[0007] The anti-interference module includes: a voltage divider circuit, an operational amplifier and a filter circuit; the output end of the digital-to-analog converter is electrically connected to the input end of the operational amplifier through the voltage divider circuit; the output end of the operational amplifier is electrically connected to the processor through the filter circuit.

[0008] In a possible implementation, the voltage divider circuit includes: a first resistor and a second resistor;

[0009] The first resistor and the second resistor are both electrically connected to the non-inverting input terminal of the operational amplifier.

[0010] In a possible implementation, the filtering circuit includes: a third resistor and a capacitor;

[0011] The third resistor is electrically connected to the processor, one electrode of the capacitor is electrically connected to the third resistor in series, and the other electrode of the capacitor is grounded.

[0012] In a possible implementation, the voltage comparison module is provided with a voltage comparator;

[0013] The input end of the voltage comparator is electrically connected to the output end of the protection voltage circuit and the inverting input end of the operational amplifier respectively;

[0014] In a possible implementation, the voltage comparison module is further provided with a second filtering circuit;

[0015] The inverting input terminal of the operational amplifier is electrically connected to the input terminal of the voltage comparator through the second filter circuit.

[0016] In a possible implementation, the device further includes: a digital chip;

[0017] The output terminal of the voltage comparator is electrically connected to the digital chip.

[0018] In a possible implementation, the device further includes: an indicator light circuit;

[0019] The indicator light circuit is electrically connected to the digital chip.

[0020] In a possible implementation, the operational amplifier model is TLC2272AID.

[0021] In a possible implementation, the operational amplifier is LM2903QDRQ1.

[0022] In a possible implementation, the model of the digital chip is CD4068B.

[0023] Beneficial effect: The digital signal is converted by the digital-to-analog converter and output to the anti-interference module. The input voltage VI is divided by the voltage divider circuit to obtain the required voltage value and input to the operational amplifier. The operational amplifier has the functions of isolation protection and voltage following. The operational amplifier outputs to the filter circuit, and the high-frequency part is short-circuited by the capacitor, thereby filtering out high-frequency noise or ripple, protecting electronic components from voltage interference. Compared with directly outputting voltage signals to the processor, the output voltage of this application is more stable, allowing the processor to stably collect voltage signals.

[0024] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0026] Figure 1 A circuit diagram showing an anti-interference module and a voltage comparison module according to an embodiment of the present application;

[0027] Figure 2A circuit diagram of a digital chip 300 according to an embodiment of the present application is shown;

[0028] Figure 3 A circuit diagram showing a protection voltage circuit according to an embodiment of the present application;

[0029] Figure 4 A circuit diagram of a signal acquisition module in the prior art is shown. DETAILED DESCRIPTION

[0030] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0031] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0034] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0035] Figure 1 A circuit diagram showing an anti-interference module and a voltage comparison module according to an embodiment of the present application; Figure 2A circuit diagram of a digital chip 300 according to an embodiment of the present application is shown; Figure 3 A circuit diagram showing a protection voltage circuit according to an embodiment of the present application; Figure 4 The circuit diagram of the existing signal acquisition module is shown as follows Figure 1 The electrical signal transmission system is characterized by comprising: an anti-interference module, a protection voltage circuit and a voltage comparison module; the input end of the anti-interference module is electrically connected to the output end of the digital-to-analog converter; the output end of the anti-interference module and the protection voltage circuit are both electrically connected to the input end of the voltage comparison module; the anti-interference module comprises: a voltage divider circuit, an operational amplifier 100 and a filter circuit; the output end of the digital-to-analog converter is electrically connected to the input end of the operational amplifier 100 through the voltage divider circuit; the output end of the operational amplifier 100 is electrically connected to the processor through the filter circuit.

[0036] Here, it should be noted that the digital signal is converted by the digital-to-analog converter and output to the anti-interference module. The input voltage VI is divided by the voltage divider circuit to obtain the required voltage value and input to the operational amplifier 100. The operational amplifier 100 has the functions of isolation protection and voltage following. The operational amplifier 100 outputs to the filter circuit, and the high-frequency part is short-circuited by the capacitor, thereby filtering out high-frequency noise or ripple, protecting electronic components from voltage interference. Compared with Figure 4 The voltage signal is directly output to the processor. The output voltage of the present application is more stable, so that the processor can stably collect the voltage signal. The subsequent output voltage is connected to the voltage comparator 200, and compared with the protection voltage circuit to finally output a high level or a low level.

[0037] In a possible implementation, the voltage divider circuit includes: a first resistor and a second resistor; the first resistor and the second resistor are both electrically connected to the non-inverting input terminal of the operational amplifier 100. Figure 1 As shown, one end of the first resistor R15 is electrically connected to the digital-to-analog converter to access the voltage signal, and the other end of the first resistor R15 is electrically connected to the non-inverting input end of the operational amplifier 100; one end of the second resistor R18 is connected in series with the first resistor, and the other end of the second resistor R18 is grounded. At the same time, one pole of the capacitor C25 is electrically connected to the access voltage signal circuit, and the other pole of the capacitor C25 is grounded. The capacitor C25 is suitable for filtering the access voltage signal.

[0038] In a possible implementation, the model of the operational amplifier 100 is TLC2272AID, the third pin (non-inverting input terminal) of the operational amplifier 100 is electrically connected to the first resistor R15 to receive the voltage signal after voltage division, the second pin (inverting input terminal) of the operational amplifier 100 is electrically connected to the second pin of the voltage comparator 200 to transmit the comparison voltage signal, the eighth pin of the operational amplifier 100 is connected to the +5V voltage, and the fourth pin (ground terminal) of the operational amplifier 100 is grounded; the output terminal of the operational amplifier 100 is electrically connected to the processor chip through the filter circuit, which is suitable for the processor chip to collect the voltage signal. It should be noted that the operational amplifier 100 has the advantages of high impedance input and low impedance output. The operational amplifier 100 with large input impedance is equivalent to an open circuit with the previous stage, and the low impedance output is equivalent to a short circuit with the subsequent circuit. The input voltage value of the subsequent circuit is equal to the output voltage value of the operational amplifier 100. Effectively preventing the influence of voltage fluctuations improves efficiency.

[0039] In a possible implementation, the filtering circuit includes: a third resistor R16 and a capacitor C27; the output end of the operational amplifier 100 is electrically connected to one end of the third resistor R16, the other end of the third resistor R16 is electrically connected to the processor chip, one pole of the capacitor C27 is electrically connected in series with the third resistor R16, and the other pole of the capacitor is grounded. It should be noted that after the input signal passes through the series connection of the resistor and the capacitor, the high-frequency part is short-circuited by the capacitor, thereby filtering out high-frequency noise or ripple. The filtering process is simple and low-cost, and effectively ensures the stability of the voltage accessed by the processor chip.

[0040] In one possible implementation, the protection voltage circuit is provided with: a resistor R152, a resistor R159 and a capacitor C198; an input voltage of 3.0 is connected to one end of the resistor R152, the other end of the resistor R152 is electrically connected to the resistor R159 and the protection voltage is output simultaneously, one end of the resistor R159 is electrically connected to the resistor R152, and the other end of the resistor R159 is grounded; the capacitor C198 is electrically connected in series with the resistor R159, which is suitable for filtering the protection voltage to ensure the output stability of the protection voltage.

[0041] In a possible implementation, the voltage comparison module is further provided with a second filter circuit; the output end of the anti-interference module is electrically connected to the input end of the voltage comparator 200 through the second filter circuit. Figure 1As shown, the second filtering circuit includes: a fourth resistor R17 and a second capacitor C28; the second pin (inverting input terminal) of the operational amplifier 100 is electrically connected to one end of the fourth resistor R17, the other end of the fourth resistor R17 is electrically connected to the second pin of the voltage comparator 200, one electrode of the second capacitor C28 is electrically connected in series with the fourth resistor R17, and the other electrode of the second capacitor C28 is grounded. It should be noted that after the comparison voltage signal passes through the series connection of the fourth resistor R17 and the second capacitor C28, the high-frequency part is short-circuited by the capacitor, thereby filtering out high-frequency noise or ripples, avoiding interference to the voltage comparator 200, and ensuring the stable operation of the voltage comparator 200.

[0042] In a possible implementation, the voltage comparison module is provided with a voltage comparator 200; the input end of the voltage comparator 200 is electrically connected to the output end of the protection voltage circuit and the input end of the operational amplifier 100 respectively; the output end of the voltage comparator 200 is electrically connected to the digital chip 300. It should be noted that the model of the voltage comparator 200 is LM2903QDRQ1. Further, the second pin (input end) of the voltage comparator 200 is electrically connected to the anti-interference module through the second filter circuit and is suitable for receiving the comparison voltage signal, the third pin (input end) of the voltage comparator 200 is electrically connected to the protection voltage circuit and is suitable for receiving the protection voltage, the fourth pin (ground end) of the voltage comparator 200 is grounded; the fifth pin of the voltage comparator 200 is connected to the +5V working voltage; the output end of the voltage comparator 200 is electrically connected to the digital chip 300. One end of the resistor R14 is connected to a +3.3V voltage, the other end of the resistor R14 is electrically connected to the output end of the voltage comparator 200, one pole of the capacitor C26 is electrically connected to the output end of the voltage comparator 200, and the other pole of the capacitor C26 is grounded. The voltage comparator 200 compares the comparison voltage signal with the protection voltage, and the comparison finally outputs a high level or a low level, wherein the multiple inputs remain at the same high or low level. It should be noted that the resistor R14 uses a pull-up resistor to keep the output voltage at 3.3V; the function of the capacitor C26 is to filter out the alternating current.

[0043] In a possible implementation, it also includes: a digital chip 300. The model of the digital chip 300 is CD4068B; the 9th pin of the digital chip 300 is electrically connected to the output end of the voltage comparator 200 to receive the OIa-L signal; the 14th pin (VDD end) of the digital chip 300 is connected to the +3.3V working voltage; one pole of the capacitor C84 is electrically connected to the 14th pin of the digital chip 300, and the other pole of the capacitor C84 is grounded; the capacitor C84 is suitable for filtering the working voltage received by the digital chip 300. The 1st pin of the digital chip 300 is electrically connected to the negative pole of the light emitting diode of the indicator circuit and is suitable for transmitting the DSP XINTI signal, one end of the resistor R96 is electrically connected to the positive pole of the light emitting diode, and the other end of the resistor R96 is connected to the +3.3V voltage; the resistors R97 and R97 are suitable for voltage division; one pole of the capacitor C82 is electrically connected to the negative pole of the light emitting diode, and the other pole of the capacitor C82 is grounded, and the capacitor C82 is suitable for filtering the alternating current. The high and low levels output from the output end of the voltage comparator 200 then enter the digital chip 300. If the voltage does not exceed the protection voltage value, the output level remains at the same high or low. If the voltage exceeds the protection voltage value, the voltage comparator 200 will output an opposite level signal to the digital chip 300, and the digital chip 300 will light up the indicator light to facilitate timely detection of faults and maintenance.

[0044] In a possible implementation, a first voltage conversion chip and a second voltage conversion chip are also included, and the first voltage conversion chip and the second voltage conversion chip are suitable for converting the voltage into the working voltage required by the operational amplifier 100, the voltage comparator 200, and the digital chip 300, and supplying power thereto. Further, the third pin (VIN terminal) of the first voltage conversion chip is connected to a 24V voltage; the second pin (ground terminal) of the first voltage conversion chip is grounded; the fourth pin (VOUT terminal) of the first voltage conversion chip outputs a +5V voltage; the capacitor C50 and the capacitor C51 are electrically connected to the wire of the output voltage, which is suitable for filtering the influence of the alternating current. The second pin (VIN terminal) of the second voltage conversion chip is connected to a 5V voltage; the third pin (ground terminal) and the first pin (EN terminal) of the second voltage conversion chip are grounded; the fourth pin (VOUT terminal) of the first voltage conversion chip outputs a +3.3V voltage; the capacitor C86 and the capacitor C192 are connected to the wire of the output +3.3V voltage, which is suitable for filtering the output voltage and ensuring the stability of the power supply.

[0045] Furthermore, the model of the digital-to-analog converter is DSP28335.

[0046] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electrical signal transmission system, characterized in that: include: Anti-interference module, protection voltage circuit and voltage comparison module; The input end of the anti-interference module is electrically connected to the output end of the digital-to-analog converter; The output end of the anti-interference module and the protection voltage circuit are both electrically connected to the input end of the voltage comparison module; The anti-interference module includes: a voltage divider circuit, an operational amplifier and a filter circuit; the output end of the digital-to-analog converter is electrically connected to the input end of the operational amplifier through the voltage divider circuit; the output end of the operational amplifier is electrically connected to the processor through the filter circuit.

2. The electrical signal transmission system according to claim 1, characterized in that: The voltage divider circuit comprises: a first resistor and a second resistor; The first resistor is electrically connected to the non-inverting input terminal of the operational amplifier; the first resistor is electrically connected to the second resistor in series.

3. The electrical signal transmission system according to claim 1, characterized in that: The filtering circuit comprises: a third resistor and a capacitor; The third resistor is electrically connected to the processor, one electrode of the capacitor is electrically connected to the third resistor in series, and the other electrode of the capacitor is grounded.

4. The electrical signal transmission system according to claim 1, characterized in that: The voltage comparison module is provided with a voltage comparator; The input end of the voltage comparator is electrically connected to the output end of the protection voltage circuit and the inverting input end of the operational amplifier respectively.

5. The electrical signal transmission system according to claim 4, characterized in that: The voltage comparison module is also provided with a second filtering circuit; The inverting input terminal of the operational amplifier is electrically connected to the input terminal of the voltage comparator through the second filter circuit.

6. The electrical signal transmission system according to claim 4, characterized in that: Also includes: Digital chips; The output end of the voltage comparator is electrically connected to the digital chip.

7. The electrical signal transmission system according to claim 6, characterized in that: Also includes: Indicator light circuit; The indicator light circuit is electrically connected to the digital chip.

8. The electrical signal transmission system according to claim 1, characterized in that: The model of the operational amplifier is TLC2272AID.

9. The electrical signal transmission system according to claim 5, characterized in that: The model of the voltage comparator is LM2903QDRQ1.

10. The electrical signal transmission system according to claim 6, characterized in that: The model of the digital chip is CD4068B.

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