CN218974449U - Signal acquisition circuit and signal acquisition device - Google Patents

Abstract

The utility model discloses a signal acquisition circuit and a signal acquisition device. The signal acquisition circuit includes: the system comprises a signal input module, a voltage stabilizing module, a signal processing module and at least one signal acquisition module; the input end of the signal input module is used for being electrically connected with an external power supply, and the signal input module is used for outputting a received voltage detection signal to the voltage stabilizing module; the voltage stabilizing module is used for stabilizing the voltage detection signal and outputting the voltage detection signal to the signal processing module; the signal processing module is used for performing signal processing on the voltage detection signal after voltage stabilization so as to select a preset voltage signal and output the preset voltage signal to the at least one signal acquisition module; the at least one signal acquisition module is used for transmitting a preset voltage signal to the resistor to be detected so that the external detection equipment acquires the voltage signals at two ends of the resistor to be detected. The technical scheme of the embodiment of the utility model can improve the accuracy of the acquired voltage signals at the two ends of the resistor to be detected, reduce the acquisition times and reduce the detection cost.

Description

Signal acquisition circuit and signal acquisition device

Technical Field

The embodiment of the utility model relates to the technical field of signal acquisition, in particular to a signal acquisition circuit and a signal acquisition device.

Background

A negative temperature coefficient thermistor (Negative Temperature Coefficient, NTC) is a thermistor that decreases in resistance exponentially with increasing temperature. In the use process, the relation between the temperature and the resistance of the NTC needs to be tested periodically to detect whether the working performance of the NTC is normal.

In the prior art, when acquiring the voltage signal of the NTC required for calculating the temperature and the resistance of the NTC, the voltage signal is generally acquired at least twice, even multiple times, and the average value is taken as a final result, so that the acquired voltage signal of the NTC is ensured to have certain accuracy. However, multiple acquisitions of the voltage signal may result in higher costs for performance detection of the NTC.

Disclosure of Invention

The utility model provides a signal acquisition circuit and a signal acquisition device, which are used for improving the accuracy of acquired voltage signals, reducing the signal acquisition times and reducing the detection cost.

According to an aspect of the present utility model, there is provided a signal acquisition circuit comprising: the system comprises a signal input module, a voltage stabilizing module, a signal processing module and at least one signal acquisition module;

the input end of the signal input module is used for being electrically connected with an external power supply, and the output end of the signal input module is electrically connected with the third end of the voltage stabilizing module; the second end of the voltage stabilizing module is electrically connected with the first end of the signal processing module, and the first end of the voltage stabilizing module is grounded; the second end of the signal processing module is grounded, the third end of the signal processing module is electrically connected with at least one signal acquisition module, the first access end of at least one signal acquisition module is electrically connected with a resistor to be tested, and the second access end of at least one signal acquisition module is electrically connected with external detection equipment;

the signal input module is used for outputting the received voltage detection signal to the voltage stabilizing module; the voltage stabilizing module is used for stabilizing the voltage detection signal and outputting the voltage detection signal to the signal processing module; the signal processing module is used for performing signal processing on the voltage detection signals after voltage stabilization so as to select preset voltage signals and output the preset voltage signals to at least one signal acquisition module; and at least one signal acquisition module is used for transmitting the preset voltage signal to the resistor to be detected so that the external detection equipment acquires the voltage signals at two ends of the resistor to be detected.

Optionally, the signal input module includes: the first compensation unit and the power input interface;

the first end of the first compensation unit is electrically connected with the third end of the voltage stabilizing module and the positive electrode of the power input interface, the second end of the first compensation unit is electrically connected with the negative electrode of the power input interface, and the negative electrode of the power input interface is grounded;

the first compensation unit is used for providing circuit compensation, and the power input interface is used for being connected with the external power supply.

Optionally, the first compensation unit includes: a first capacitor and a second capacitor;

the first end of the first capacitor and the first end of the second capacitor are electrically connected with the third end of the voltage stabilizing module, and the second end of the first capacitor is electrically connected with the second end of the second capacitor and then grounded.

Optionally, the signal processing module includes: the voltage reference chip, the second compensation unit and the third compensation unit;

the first end of the second compensation unit is electrically connected with the second end of the voltage stabilizing module, the second end of the second compensation unit is electrically connected with the first pin of the voltage reference chip, the third pin of the second compensation unit is grounded, the second pin of the voltage reference chip is electrically connected between the third end of the second compensation unit and the ground, and the third pin of the voltage reference chip is in idle connection; the first end of the third compensation unit is electrically connected with the first pin of the voltage reference chip, the second end of the third compensation unit is electrically connected with the third end of the signal processing module, and the third end of the third compensation unit is electrically connected between the second pin of the voltage reference chip and the ground end;

the second compensation unit and the third compensation unit are used for providing circuit compensation.

Optionally, the signal processing module further comprises: a first resistor;

the first resistor is electrically connected between the second end of the second compensation unit and the first pin of the voltage reference chip, and the second end of the first resistor is electrically connected with the first end of the third compensation unit.

Optionally, the second compensation unit includes: a third capacitor and a fourth capacitor; the third compensation unit includes: a fifth capacitance and a sixth capacitance;

the first end of the third capacitor and the first end of the fourth capacitor are electrically connected with the second end of the voltage stabilizing module and the first end of the first resistor; the second end of the third capacitor is electrically connected with the second end of the fourth capacitor and then grounded;

the first end of the fifth capacitor and the first end of the sixth capacitor are electrically connected with the second end of the first resistor and the third end of the third compensation unit, and the second end of the fifth capacitor and the second end of the sixth capacitor are electrically connected with the second pin of the voltage reference chip.

Optionally, the voltage reference chip includes: LM4040 type voltage reference chip.

Optionally, the signal acquisition module includes: the first input end, the second input end, the first output end, the second resistor and the seventh capacitor;

the first end of the seventh capacitor is electrically connected with the first input end, the second end of the seventh capacitor is electrically connected with the second input end, and the first end of the seventh capacitor is grounded; the first end of the second resistor is electrically connected with the second end of the seventh capacitor, the first end of the second resistor is electrically connected with the first output end, the second end of the second resistor is electrically connected with the third end of the signal processing module, and the second output end is grounded;

the signal acquisition module is electrically connected with the external detection equipment through the first output end and the second output end.

Optionally, the voltage stabilizing module includes: NCP1117 type voltage regulator.

According to another aspect of the present utility model there is provided a signal acquisition device comprising the signal acquisition circuit of the first aspect.

According to the signal acquisition circuit provided by the technical scheme of the embodiment of the utility model, the resistor to be detected and the external detection equipment are respectively and electrically connected to the signal acquisition module, the external power supply inputs a voltage detection signal to the signal input module, and the voltage detection signal is input into the voltage stabilizer through the signal input module. After the voltage stabilizing module carries out voltage stabilizing treatment on the voltage detection signal, the voltage detection signal after voltage stabilizing is transmitted to the signal processing module. The signal processing module carries out precision processing on the voltage detection signals, outputs preset voltage signals meeting the requirements of the resistor to be detected to the signal acquisition module, provides electric energy for the resistor to be detected, and acquires and detects voltage signals at two ends of the resistor to be detected by external detection equipment. By adopting the signal acquisition circuit provided by the embodiment of the utility model, the accuracy of the voltage detection signal for supplying power to the resistor to be detected can be improved, so that the accuracy of the acquired voltage signals at two ends of the resistor to be detected is improved, the acquisition times are effectively reduced, and the detection cost is reduced.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of a signal acquisition circuit according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of a signal acquisition circuit according to another embodiment of the present utility model;

fig. 3 is a schematic circuit diagram of a signal acquisition module in a signal acquisition circuit according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The embodiment of the utility model provides a signal acquisition circuit. Fig. 1 is a schematic circuit diagram of a signal acquisition circuit according to an embodiment of the present utility model, where the signal acquisition circuit is applied to acquire voltage signals of NTC. As shown in fig. 1, the signal acquisition circuit includes: the system comprises a signal input module 40, a voltage stabilizing module 20, a signal processing module 30 and at least one signal acquisition module 10.

The input end of the signal input module 40 is used for being electrically connected with an external power supply, and the output end of the signal input module 40 is electrically connected with the third end X3 of the voltage stabilizing module 20; the second end X2 of the voltage stabilizing module 20 is electrically connected with the first end of the signal processing module 30, and the first end X1 of the voltage stabilizing module 20 is grounded; the second end of the signal processing module 30 is grounded, the third end of the signal processing module 30 is electrically connected with at least one signal acquisition module 10, the first access end X4 of the at least one signal acquisition module 10 is used for being electrically connected with a resistor to be tested, and the second access end X5 of the at least one signal acquisition module 10 is used for being electrically connected with external detection equipment.

The signal input module 40 is configured to output the received voltage detection signal to the voltage stabilizing module 20; the voltage stabilizing module 20 is used for stabilizing the voltage detection signal and outputting the voltage detection signal to the signal processing module 30; the signal processing module 30 is configured to perform signal processing on the voltage detection signal after voltage stabilization, so as to select a preset voltage signal and output the preset voltage signal to the at least one signal acquisition module 10; the at least one signal acquisition module 10 is configured to transmit a preset voltage signal to the resistor to be tested, so that the external detection device acquires the voltage signals at two ends of the resistor to be tested.

Specifically, when performance detection of the resistor to be detected is performed, the external power supply provides electric energy, namely a voltage detection signal, for the resistor to be detected. The voltage detection signal is input from the input end of the signal input module 40, and after the voltage stabilization processing of the signal input module 40, the series resonance phenomenon generated in the circuit can be improved, so that the possibility that the overvoltage phenomenon is generated by part of elements in the circuit due to the external power supply for supplying power is reduced.

The signal input module 40 inputs the voltage detection signal to the voltage stabilizing module 20 from the third terminal X3 of the voltage stabilizing module 20. After the voltage detection signal is subjected to voltage stabilization processing by the voltage stabilization module 20, the voltage detection signal is output to the signal processing module 30 by the second end X2 of the voltage stabilization module 20. The signal processing module 30 processes the voltage detection signal accurately, and outputs a preset voltage signal which is close to the voltage value of the standard level value signal in the voltage detection signal to the signal acquisition module 10 to supply power to the resistor to be tested, so that the preset voltage signals received by two ends of the resistor to be tested meet the requirement of the resistor to be tested on the working voltage. The standard level value signal may be, for example, a voltage value signal that is close to the nominal operating voltage of the resistor under test. The voltage value of the standard level value signal has a mapping relation with the model of the resistor to be measured, namely, after the model of the resistor to be measured is determined, the voltage value of the standard level value signal can be determined.

The signal acquisition module 10 is used for connecting the resistor to be tested and external detection equipment, and acquiring the voltages at two ends of the resistor to be tested through the external detection equipment, so that the performance of the resistor to be tested is detected through the voltages at two ends of the resistor to be tested. The resistors to be measured may be, for example, negative temperature coefficient thermistors (Negative Temperature Coefficient, NTC) of different models, which correspond to standard level value signals of different voltage values. The voltage detection signals input by the external power supply are processed through the signal input module 40, the voltage stabilizing module 20 and the signal processing module 30 to obtain preset voltage signals, so that the preset voltage signals for supplying power to the resistor to be detected meet the working voltage requirement of the resistor to be detected, overvoltage generated by partial elements in the circuit due to the external power supply for supplying power to the signal acquisition circuit is avoided, and the voltage signals at two ends of the resistor to be detected acquired by the external detection equipment have higher accuracy. Therefore, the voltage signals at the two ends of the resistor to be detected are collected once, so that whether the performance of the resistor to be detected is normal can be judged, the collection times are effectively reduced, and the detection cost is reduced.

According to the signal acquisition circuit provided by the technical scheme of the embodiment, the resistor to be detected and the external detection equipment are respectively and electrically connected to the signal acquisition module, the external power supply inputs voltage detection signals to the signal input module, and the voltage detection signals are input into the voltage stabilizer through the signal input module. After the voltage stabilizing module carries out voltage stabilizing treatment on the voltage detection signal, the voltage detection signal after voltage stabilizing is transmitted to the signal processing module. The signal processing module carries out precision processing on the voltage detection signals, outputs preset voltage signals meeting the requirements of the resistor to be detected to the signal acquisition module, provides electric energy for the resistor to be detected, and acquires and detects voltage signals at two ends of the resistor to be detected by external detection equipment. By adopting the signal acquisition circuit provided by the embodiment, the accuracy of the voltage detection signal for supplying power to the resistor to be detected can be improved, so that the accuracy of the acquired voltage signals at two ends of the resistor to be detected is improved, the acquisition times are effectively reduced, and the detection cost is reduced.

Optionally, fig. 2 is a schematic circuit diagram of another signal acquisition circuit according to an embodiment of the present utility model. With continued reference to fig. 2, based on the above embodiments, the signal input module 40 includes: a first compensation unit 41 and a power input interface 42.

The first end of the first compensation unit 41 is electrically connected with the third end X3 of the voltage stabilizing module 20 and the positive electrode of the power input interface 42, the second end of the first compensation unit 41 is electrically connected with the negative electrode of the power input interface 42, and the negative electrode of the power input interface 42 is grounded; the first compensation unit 41 is used for providing circuit compensation, and the power input interface 42 is used for connecting an external power supply.

Specifically, an external power source is electrically connected to the positive and negative poles of the power input interface 42. The external power source inputs a voltage detection signal to the signal input module 40 through the power input interface 42. The voltage detection signal enters the signal input module 40 and then is transmitted to the first end of the first compensation unit 41, and the third end of the first compensation unit 41 is grounded to form a grounding loop, so that circuit compensation can be provided, overvoltage phenomenon of the voltage detection signal is reduced, and accuracy of the voltage detection signal is improved. The processed voltage detection signal is input to the voltage stabilizing module 20 from the third terminal X3 of the voltage stabilizing module 20.

Alternatively, on the basis of the above embodiments, with continued reference to fig. 3, the first compensation unit 41 includes: a first capacitor C1 and a second capacitor C2.

The first end of the first capacitor C1 and the first end of the second capacitor C2 are electrically connected to the third end X3 of the voltage stabilizing module 20, and the second end of the first capacitor C1 is electrically connected to the second end of the second capacitor C2 and then grounded.

Specifically, the first capacitor C1 and the second capacitor C2 are connected in parallel between the first end of the first compensation unit 41 and the ground, or the first capacitor C1 and the second capacitor C2 are connected in parallel between the second end of the first compensation unit 41 and the ground, and the first end and the second end of the first compensation unit 41 are electrically connected to the first end of the first capacitor C1 and the first end of the second capacitor C2. The first capacitor C1 and the second capacitor C2 are connected in parallel and then grounded, so as to reduce the resonant overvoltage in the circuit and output the resonant overvoltage to the voltage stabilizing module 20.

Optionally, with continued reference to fig. 2, based on the above embodiments, the signal processing module 30 includes: a voltage reference chip 31, a second compensation unit 32 and a third compensation unit 33.

The first end of the second compensation unit 32 is electrically connected with the second end X2 of the voltage stabilizing module 20, the second end of the second compensation unit 32 is electrically connected with the first pin 11 of the voltage reference chip 31, the third end of the second compensation unit 32 is grounded, the second pin 12 of the voltage reference chip 31 is electrically connected between the third end of the second compensation unit 32 and the ground, and the third pin 13 of the voltage reference chip 31 is in idle connection; the first end of the third compensation unit 33 is electrically connected to the third end of the signal processing module 30 between the first end of the third compensation unit 33 and the first pin 11 of the voltage reference chip 31, and the third end of the third compensation unit 33 is electrically connected to the second pin 12 of the voltage reference chip 31 and the ground.

The second compensation unit 32 and the third compensation unit 33 are used for providing circuit compensation.

Specifically, the voltage reference chip 31 is configured to provide a preset voltage signal, that is, for different types of resistors to be tested, the preset voltage signal is generated according to standard level value signals corresponding to the voltage values. Illustratively, the voltage reference chip 31 includes: LM4040 type voltage reference chip. The first pin 11 of the voltage reference chip 31 is the cathode of the LM4040 type voltage reference chip, the second pin 12 of the voltage reference chip 31 is the anode of the LM4040 type voltage reference chip, and the third pin 13 of the voltage reference chip 31 is the substrate or dummy pin of the LM4040 type voltage reference chip. In this embodiment, fig. 3 shows that the third pin 13 of the voltage reference chip 31 is subjected to the air-interface process. The second compensation unit 32 and the third compensation unit 33 are connected in parallel, and are electrically connected between the first leg 11 and the second leg 12 of the voltage reference chip 31. The second compensation unit 32 and the third compensation unit 33 can reduce the resonance overvoltage of the circuit system and provide circuit compensation for the circuit system.

Optionally, with continued reference to fig. 3, based on the above embodiments, the signal processing module 30 further includes: a first resistor R1.

The first resistor R1 is electrically connected between the second end of the second compensation unit 32 and the first pin of the voltage reference chip 31, and the second end of the first resistor R1 is electrically connected with the first end of the third compensation unit 33.

Specifically, the first resistor R1 is disposed on the input line of the first pin of the voltage reference chip 31. The first resistor R1 has a pre-protection function on the voltage reference chip 31 to prevent the voltage of the voltage detection signal input to the voltage reference chip 31 from being too high, which may damage the voltage reference chip 31.

Optionally, with continued reference to fig. 3, based on the above embodiments, the second compensation unit 32 includes: a third capacitor C3 and a fourth capacitor C4; the third compensation unit 33 includes: a fifth capacitor C5 and a sixth capacitor C6.

The first end of the third capacitor C3 and the first end of the fourth capacitor C4 are electrically connected to the second end X2 of the voltage stabilizing module 20 and to the first end of the first resistor R1; the second end of the third capacitor C3 is electrically connected to the second end of the fourth capacitor C4 and then grounded.

The first terminal of the fifth capacitor C5 and the first terminal of the sixth capacitor C6 are electrically connected to the second terminal of the first resistor R1 and the third terminal of the third compensation unit 33, and the second terminal of the fifth capacitor C5 and the second terminal of the sixth capacitor C6 are electrically connected to the second pin of the voltage reference chip 31.

Specifically, the third capacitor C3 and the fourth capacitor C4 are connected in parallel between the first end of the second compensation unit 32 and the ground, or the third capacitor C3 and the fourth capacitor C4 are connected in parallel between the second end of the second compensation unit 32 and the ground, and the first end and the second end of the second compensation unit 32 are electrically connected to the first end of the third capacitor C3 and the first end of the fourth capacitor C4. The third capacitor C3, the fourth capacitor C4 and the first resistor R1 form a parallel circuit so as to reduce resonance overvoltage in the circuit, thereby improving the accuracy of the acquired voltage signals and reducing the acquisition times.

In addition, the fifth capacitor C5 and the sixth capacitor C6 are connected in parallel between the first end of the third compensation unit 33 and the ground, or the fifth capacitor C5 and the sixth capacitor C6 are connected in parallel between the second end of the third compensation unit 33 and the ground, and the first end and the second end of the third compensation unit 33 are electrically connected to the first end of the fifth capacitor C5 and the first end of the sixth capacitor C6. The fifth capacitor C5, the sixth capacitor C6 and the first resistor R1 form a parallel loop, resonance overvoltage of a circuit system can be reduced, circuit compensation is provided, and acquired voltage signals are more accurate, so that acquisition times are reduced, and detection cost is reduced.

Optionally, fig. 3 is a schematic circuit diagram of a signal acquisition module in a signal acquisition circuit according to an embodiment of the present utility model. On the basis of the above embodiment, as shown in fig. 3, the signal acquisition module 10 includes: a first input 1, a second input 2, a first output 3, a second output 4, a second resistor R2 and a seventh capacitance C7.

A first end of a seventh capacitor C7 is electrically connected with the first input end 1, a second end of the seventh capacitor C7 is electrically connected with the second input end 2, and a first end of the seventh capacitor C7 is grounded; the first end of the second resistor R2 is electrically connected to the second end of the seventh capacitor C7, the first end of the second resistor R2 is electrically connected to the first output end 3, the second end of the second resistor R2 is electrically connected to the third end of the signal processing module 30, and the second output end 4 is grounded.

The signal acquisition module 10 is electrically connected with an external detection device through the first output terminal 3 and the second output terminal 4.

Specifically, two ends of the resistor to be tested are respectively and electrically connected with the first input end 1 and the second input end 2 of the signal acquisition module 10, so that the resistor to be tested is connected into the signal acquisition circuit. The resistor to be measured and the second resistor R2 are connected in series between the power supply and the ground, and the seventh capacitor C7 is connected in parallel to two ends of the resistor to be measured. And the first output terminal 3 is electrically connected between the first terminal of the second resistor R2 and the second terminal of the seventh capacitor C7, and the second output terminal 4 is grounded. Therefore, the voltage between the first output terminal 3 and the second output terminal 4 is the voltage across the resistor to be tested. After the preset voltage signal is input into the signal acquisition module 10, the external detection device can acquire the voltage signals at two ends of the resistor to be detected through the first output end 3 and the second output end 4 of the signal acquisition module 10 so as to detect the performance of the resistor to be detected.

It should be noted that, the signal acquisition circuit includes a plurality of signal acquisition modules 10, and the circuit connection structures of the signal acquisition modules 10 are identical, and a plurality of resistors to be measured are respectively connected to the signal acquisition modules 10. The number of signal acquisition modules 10 may be 10, for example, without limitation. The voltage signals at two ends of a plurality of resistors to be tested can be collected simultaneously by arranging the plurality of signal collection modules 10, and the performance of the plurality of resistors to be tested can be detected simultaneously, so that the efficiency of the performance detection work of the resistors to be tested is greatly improved.

Optionally, with continued reference to fig. 2, based on the above embodiments, the voltage stabilizing module 20 includes: NCP1117 type voltage regulator.

Specifically, the NCP1117 voltage regulator includes three terminals, i.e., an input terminal, an output terminal, and a ground terminal. In this embodiment, the first end X1 of the voltage stabilizing module 20 is an input end of the NCP1117 type voltage stabilizer, the second end X2 of the voltage stabilizing module 20 is a ground end of the NCP1117 type voltage stabilizer, and the third end X3 of the voltage stabilizing module 20 is an output end of the NCP1117 type voltage stabilizer. The signal processing module 30 is connected between the ground terminal and the ground of the NCP1117 type voltage regulator, so the NCP1117 type voltage regulator in the present embodiment is a tunable voltage regulator.

The embodiment of the utility model also provides a signal acquisition device. The signal acquisition device comprises the signal acquisition circuit in any embodiment, the signal acquisition device is provided with a plurality of signal acquisition modules, each signal acquisition module is electrically connected with the third end of the signal processing module, a plurality of resistors to be detected can be connected simultaneously, and voltage detection signals input by an external power supply are subjected to voltage stabilization processing and precision processing to obtain preset voltage signals meeting the working voltage of each resistor to be detected, so that power is supplied to each resistor to be detected. The external detection equipment can be electrically connected with each signal acquisition module simultaneously, and voltage signals at two ends of a plurality of resistors to be detected are acquired simultaneously for detection, so that the accuracy of each voltage signal is improved, the resonance overvoltage in a circuit system is reduced, the acquisition times are reduced, and the detection cost is reduced.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A signal acquisition circuit, comprising: the system comprises a signal input module, a voltage stabilizing module, a signal processing module and at least one signal acquisition module;

the input end of the signal input module is used for being electrically connected with an external power supply, and the output end of the signal input module is electrically connected with the third end of the voltage stabilizing module; the second end of the voltage stabilizing module is electrically connected with the first end of the signal processing module, and the first end of the voltage stabilizing module is grounded; the second end of the signal processing module is grounded, the third end of the signal processing module is electrically connected with at least one signal acquisition module, the first access end of at least one signal acquisition module is electrically connected with a resistor to be tested, and the second access end of at least one signal acquisition module is electrically connected with external detection equipment;

the signal input module is used for outputting the received voltage detection signal to the voltage stabilizing module; the voltage stabilizing module is used for stabilizing the voltage detection signal and outputting the voltage detection signal to the signal processing module; the signal processing module is used for performing signal processing on the voltage detection signals after voltage stabilization so as to select preset voltage signals and output the preset voltage signals to at least one signal acquisition module; and at least one signal acquisition module is used for transmitting the preset voltage signal to the resistor to be detected so that the external detection equipment acquires the voltage signals at two ends of the resistor to be detected.

2. The signal acquisition circuit of claim 1, wherein the signal input module comprises: the first compensation unit and the power input interface;

the first end of the first compensation unit is electrically connected with the third end of the voltage stabilizing module and the positive electrode of the power input interface, the second end of the first compensation unit is electrically connected with the negative electrode of the power input interface, and the negative electrode of the power input interface is grounded;

the first compensation unit is used for providing circuit compensation, and the power input interface is used for being connected with the external power supply.

3. The signal acquisition circuit of claim 2, wherein the first compensation unit comprises: a first capacitor and a second capacitor;

the first end of the first capacitor and the first end of the second capacitor are electrically connected with the third end of the voltage stabilizing module, and the second end of the first capacitor is electrically connected with the second end of the second capacitor and then grounded.

4. A signal acquisition circuit according to any one of claims 1 to 3, wherein the signal processing module comprises: the voltage reference chip, the second compensation unit and the third compensation unit;

the first end of the second compensation unit is electrically connected with the second end of the voltage stabilizing module, the second end of the second compensation unit is electrically connected with the first pin of the voltage reference chip, the third pin of the second compensation unit is grounded, the second pin of the voltage reference chip is electrically connected between the third end of the second compensation unit and the ground, and the third pin of the voltage reference chip is in idle connection; the first end of the third compensation unit is electrically connected with the first pin of the voltage reference chip, the second end of the third compensation unit is electrically connected with the third end of the signal processing module, and the third end of the third compensation unit is electrically connected between the second pin of the voltage reference chip and the ground end;

the second compensation unit and the third compensation unit are used for providing circuit compensation.

5. The signal acquisition circuit of claim 4 wherein the signal processing module further comprises: a first resistor;

the first resistor is electrically connected between the second end of the second compensation unit and the first pin of the voltage reference chip, and the second end of the first resistor is electrically connected with the first end of the third compensation unit.

6. The signal acquisition circuit of claim 5, wherein the second compensation unit comprises: a third capacitor and a fourth capacitor; the third compensation unit includes: a fifth capacitance and a sixth capacitance;

the first end of the third capacitor and the first end of the fourth capacitor are electrically connected with the second end of the voltage stabilizing module and the first end of the first resistor; the second end of the third capacitor is electrically connected with the second end of the fourth capacitor and then grounded;

the first end of the fifth capacitor and the first end of the sixth capacitor are electrically connected with the second end of the first resistor and the third end of the third compensation unit, and the second end of the fifth capacitor and the second end of the sixth capacitor are electrically connected with the second pin of the voltage reference chip.

7. The signal acquisition circuit of claim 4, wherein the voltage reference chip comprises: LM4040 type voltage reference chip.

8. A signal acquisition circuit according to any one of claims 1 to 3, wherein the signal acquisition module comprises: the first input end, the second input end, the first output end, the second resistor and the seventh capacitor;

the first end of the seventh capacitor is electrically connected with the first input end, the second end of the seventh capacitor is electrically connected with the second input end, and the first end of the seventh capacitor is grounded; the first end of the second resistor is electrically connected with the second end of the seventh capacitor, the first end of the second resistor is electrically connected with the first output end, the second end of the second resistor is electrically connected with the third end of the signal processing module, and the second output end is grounded;

the signal acquisition module is electrically connected with the external detection equipment through the first output end and the second output end.

9. A signal acquisition circuit according to any one of claims 1 to 3, wherein the voltage stabilizing module comprises: NCP1117 type voltage regulator.

10. A signal acquisition device comprising a signal acquisition circuit as claimed in any one of claims 1 to 9.

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