Signal acquisition circuit and signal acquisition device

Abstract

The utility model discloses a signal acquisition circuit and a signal acquisition device, which are applied to the field of signal acquisition circuits, and include: at least one first acquisition circuit, at least one second acquisition circuit and a control module; the first acquisition circuit includes a bidirectional optical coupler; wherein the first input end of the bidirectional optical coupler is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, the second input end of the bidirectional optical coupler is connected to the second output end of the signal output circuit, the first output end of the bidirectional optical coupler is connected to the first input end of the control module as the output end of the first acquisition circuit, and the second output end of the bidirectional optical coupler is grounded; the input end of the second acquisition circuit is connected to the third output end of the signal output circuit, and the output end of the second acquisition circuit is connected to the second input end of the control module. The bidirectional optical coupler in the present application does not need to distinguish between positive and negative poles when connected, thus avoiding the irreparable problem caused by incorrect positive and negative pole connection when connected to the device.

Description

Technical Field

[0001] The utility model relates to the field of signal acquisition circuits, in particular to a signal acquisition circuit and a signal acquisition device. Background Art

[0002] In the process of factory networking management, a host computer is usually used to control multiple types or multiple devices of the same type. When the working status of the equipment or the monitoring results require the host computer to analyze and process the results, the signal needs to be given to the host computer. This involves a device for collecting signals. The connection between the equipment and the signal collection device is made through a physical connection line. The positive and negative poles of the equipment need to be connected to the positive and negative poles of the signal collection device to ensure the safe use of the equipment and the signal collection device and the accurate acquisition of the signal.

[0003] However, during the use of the equipment and the signal acquisition device, there is no clear identification of the positive and negative poles. Therefore, in the process of connecting them, it is easy to make mistakes in the connection of the positive and negative poles. When a connection error occurs, it will cause irreparable damage to the signal acquisition device or cause inaccurate signal collection and output. In addition, the signal acquisition device often involves qualitative identification of signals within a certain range and quantitative identification of signal size.

[0004] In view of the above technology, finding a signal acquisition circuit is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of the utility model is to provide a signal acquisition circuit and a signal acquisition device, which can solve the problem of irreparable damage to the signal acquisition device caused by incorrect positive and negative pole connection when the device outputs a signal in the prior art, and realize qualitative and quantitative identification of the device output signal.

[0006] In order to solve the above technical problems, the utility model provides a signal acquisition circuit, comprising:

[0007] At least one first acquisition circuit, at least one second acquisition circuit and a control module;

[0008] The first acquisition circuit includes a bidirectional optocoupler;

[0009] Wherein, the first input end of the bidirectional optocoupler is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, the second input end of the bidirectional optocoupler is connected to the second output end of the signal output circuit, the first output end of the bidirectional optocoupler is connected to the first input end of the control module as the output end of the first acquisition circuit, and the second output end of the bidirectional optocoupler is grounded;

[0010] The input end of the second acquisition circuit is connected to the third output end of the signal output circuit, and the output end of the second acquisition circuit is connected to the second input end of the control module;

[0011] The control module receives the output signal of the first acquisition circuit and the output signal of the second acquisition circuit and outputs acquisition data based on the output signal of the first acquisition circuit and the output signal of the second acquisition circuit.

[0012] Preferably, the first acquisition circuit further includes: a first resistor and a second resistor;

[0013] The first end of the first resistor is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, and the second end of the first resistor is connected to the first input end of the bidirectional optical coupler;

[0014] The first end of the second resistor is connected to the power supply end, and the second end of the second resistor and the first output end of the bidirectional optical coupler are connected to the first input end of the control module as the output end of the first acquisition circuit.

[0015] Preferably, the first acquisition circuit further includes: a third resistor;

[0016] The first end of the third resistor is connected to the second end of the second resistor and the first output end of the bidirectional optical coupler, and the second end of the third resistor is connected to the first input end of the control module as the output end of the first acquisition circuit.

[0017] Preferably, the first acquisition circuit further includes: a first capacitor, a second capacitor and a third capacitor;

[0018] A first end of the first capacitor is connected to a second end of the first resistor and a first input end of the bidirectional optical coupler, and a second end of the first capacitor is connected to a first end of the second capacitor;

[0019] The second end of the second capacitor is connected to the second input end of the bidirectional optical coupler and the second output end of the signal output circuit;

[0020] The first end of the third capacitor is connected to the first output end of the bidirectional optocoupler, the second end of the second resistor and the first end of the third resistor, and the second end of the third capacitor is connected to the second output end of the bidirectional optocoupler and is grounded.

[0021] Preferably, the first acquisition circuit further includes: a first diode;

[0022] The first end of the first diode is connected to the output end of the signal output circuit as the input end of the first acquisition circuit, and the second end of the first diode is connected to the first end of the first resistor.

[0023] Preferably, the second acquisition circuit comprises: a second diode and a third diode;

[0024] The cathode of the second diode is connected to the power supply end, and the anode of the second diode and the cathode of the third diode are connected to the third output end of the signal output circuit as the input end of the second acquisition circuit;

[0025] The anode of the third diode is grounded.

[0026] Preferably, the second acquisition circuit further includes: a fourth resistor and a fifth resistor;

[0027] The first end of the fourth resistor is connected to the third output end of the signal output circuit as the input end of the second acquisition circuit, and the second end of the fourth resistor is connected to the first end of the fifth resistor;

[0028] The second end of the fifth resistor is connected to the second input end of the control module as the output end of the second acquisition circuit.

[0029] Preferably, the second acquisition circuit further includes: a sixth resistor and a fourth capacitor;

[0030] A first end of the sixth resistor is connected to the second end of the fourth resistor, the first end of the fifth resistor and the first end of the fourth capacitor;

[0031] The second end of the sixth resistor is connected to the second end of the fourth capacitor and is grounded.

[0032] In order to solve the above technical problems, the present application also provides a signal acquisition device, including the above signal acquisition circuit.

[0033] Preferably, it also includes: a communication module and a power module;

[0034] The communication module is connected to the control module;

[0035] The output end of the power supply module is connected to the power supply end of the first acquisition circuit, the second acquisition circuit and the power supply end of the control module.

[0036] The utility model provides a signal acquisition circuit, comprising: at least one first acquisition circuit, at least one second acquisition circuit and a control module; the first acquisition circuit comprises a bidirectional optical coupler; wherein the first input end of the bidirectional optical coupler is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, the second input end of the bidirectional optical coupler is connected to the second output end of the signal output circuit, the first output end of the bidirectional optical coupler is connected to the first input end of the control module as the output end of the first acquisition circuit, and the second output end of the bidirectional optical coupler is grounded; the input end of the second acquisition circuit is connected to the third output end of the signal output circuit, the output end of the second acquisition circuit is connected to the second input end of the control module, and the control module receives the output signal of the first acquisition circuit and the output signal of the second acquisition circuit and outputs the acquisition data based on the output signal of the first acquisition circuit and the output signal of the second acquisition circuit. It can be seen that the bidirectional optical coupler in the present application does not need to distinguish between positive and negative poles when connected to the device, thus avoiding the irreparable damage caused by the incorrect connection of the positive and negative poles, and realizing the qualitative acquisition and quantitative acquisition of the output signal of the device signal output circuit. At the same time, the signal collected and transmitted by the first acquisition circuit in the present application is used to characterize the state of the device, while the signal collected and transmitted by the second acquisition circuit is used to obtain the type and size of the signal. The present application uses two acquisition circuits to collect and transmit the signals characterizing the state of the device and the type and size of the signal, respectively, which improves the security of signal transmission. When any acquisition circuit fails, it does not affect the use of the other acquisition circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A circuit diagram of a signal acquisition circuit provided in an embodiment of the present application;

[0039] Figure 2 A circuit diagram of a first acquisition circuit provided in an embodiment of the present application;

[0040] Figure 3 A circuit diagram of a second acquisition circuit provided in an embodiment of the present application;

[0041] Figure 4 A module diagram of a signal acquisition device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0043] The core of the utility model is to provide a signal acquisition circuit and a signal acquisition device.

[0044] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] Figure 1 A circuit diagram of a signal acquisition circuit provided in an embodiment of the present application, as shown in the figure, includes: at least one first acquisition circuit 1, at least one second acquisition circuit 2 and a control module 4, wherein the first acquisition circuit 1 is used to qualitatively acquire the input signal, and the second acquisition circuit 2 is used to quantitatively acquire the input signal; the first acquisition circuit includes a bidirectional optical coupler T1, in addition, Figure 1 The system also includes: a signal output circuit 3, which is used to provide input signals to the first acquisition circuit 1 and the second acquisition circuit 2.

[0046] Among them, the first input end of the bidirectional optocoupler T1 is connected to the first output end of the signal output circuit 3 as the input end of the first acquisition circuit 1, the second input end of the bidirectional optocoupler T1 is connected to the second output end of the signal output circuit 3, the first output end of the bidirectional optocoupler T1 is connected to the first input end of the control module 4 as the output end of the first acquisition circuit 1, and the second output end of the bidirectional optocoupler T1 is grounded;

[0047] The input end of the second acquisition circuit 2 is connected to the third output end of the signal output circuit 3 , and the output end of the second acquisition circuit 2 is connected to the second input end of the control module 4 .

[0048] The control module 4 receives the output signal of the first acquisition circuit 1 and the output signal of the second acquisition circuit 2 and outputs acquisition data based on the output signal of the first acquisition circuit 1 and the output signal of the second acquisition circuit 2 .

[0049] In a specific embodiment, the bidirectional optocoupler T1 is an optocoupler whose interface endpoints are not distinguished between positive and negative, and is arranged in the first acquisition circuit 1. The first input end of the bidirectional optocoupler T1 is connected to the first output end of the signal output circuit 3 as the input end of the first acquisition circuit 1, and the second input end of the bidirectional optocoupler T1 is connected to the second output end of the signal output circuit 3 as the input end of the first acquisition circuit 1, and is used to collect the signal representing the state of the device output by the signal output circuit 3, where the first output end and the second output end of the signal output circuit 3 can be interchanged; the first output end of the bidirectional optocoupler T1 is connected to the first input end of the control module 4 as the output end of the first acquisition circuit 1, and converts the signal representing the state of the device into a state judgment result signal and sends it to the control module 4, so that the control module 4 judges the received signal of the first acquisition circuit 1 and judges whether the device corresponding to the signal output circuit 3 connected to the first acquisition circuit 1 fails. The input end of the second acquisition circuit 2 is connected to the third output end of the signal output circuit 3, and is used to collect signal data of the device corresponding to the signal output circuit 3 connected to the second acquisition circuit 2; the output end of the second acquisition circuit 2 is connected to the second input end of the control module 4, and the signal data collected from the device is formed into a quantized analog signal and sent to the control module 4, so that the control module 4 performs ADC conversion (analog-to-digital conversion) on the received signal of the second acquisition circuit 2 and identifies the size of the collected signal.

[0050] Among them, as a preferred embodiment, the control module 4 includes a single-chip microcomputer, the control module 4 receives the output signal of the first acquisition circuit 1 and the output signal of the second acquisition circuit 2 to obtain the acquired data, and can transmit the acquired data to the outside world through the communication module, for example, to the host computer. The single-chip microcomputer can be integrated with an ADC, or the control module 4 can also include an ADC.

[0051] Among them, it should be noted that the signal output circuit 3 in the embodiment of the present application corresponds to one or more devices that output signals collected by the first acquisition circuit 1 and / or the second acquisition circuit 2, that is, one or more devices are respectively connected to a first acquisition circuit 1 and / or a second acquisition circuit 2, and the signal output circuit 3 is a collection of output circuits of the output acquisition signals of the one or more devices. The specific circuit is not limited in this application and can be set according to the needs of the user.

[0052] It should also be noted that the present application does not limit the specific circuit structures of the first acquisition circuit 1 and the second acquisition circuit 2, which can be set according to the needs of the user.

[0053] The utility model provides a signal acquisition circuit, comprising: at least one first acquisition circuit, at least one second acquisition circuit and a control module; the first acquisition circuit comprises a bidirectional optical coupler; wherein the first input end of the bidirectional optical coupler is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, the second input end of the bidirectional optical coupler is connected to the second output end of the signal output circuit, the first output end of the bidirectional optical coupler is connected to the first input end of the control module as the output end of the first acquisition circuit, and the second output end of the bidirectional optical coupler is grounded; the input end of the second acquisition circuit is connected to the third output end of the signal output circuit, the output end of the second acquisition circuit is connected to the second input end of the control module, and the control module receives the output signal of the first acquisition circuit and the output signal of the second acquisition circuit and outputs the acquisition data based on the output signal of the first acquisition circuit and the output signal of the second acquisition circuit. It can be seen that the bidirectional optical coupler in the present application does not need to distinguish between positive and negative poles when connected to the device, thus avoiding the problem of irreparable damage caused by incorrect positive and negative pole connection when the device is connected to the signal acquisition circuit. At the same time, the signal collected and transmitted by the first acquisition circuit in the present application is used to characterize the state of the device, such as judging whether the device has a transmission fault. For example, the part of the signal output circuit connected to the first acquisition circuit is an output circuit including an alarm light. When the alarm light is on, the output circuit including the alarm light outputs a voltage to the first acquisition circuit. The first diode indicates that a signal has entered and the first acquisition circuit outputs a high level to the control module to indicate that a fault has occurred. When the voltage output by the output circuit including the alarm light to the first acquisition circuit is within a certain range, the first acquisition circuit outputs a high level. When the alarm light is not on, the output circuit including the alarm light may not output a voltage to the first acquisition circuit. Of course, the first acquisition circuit may also be characterized by other inputs and outputs, which are not specifically limited here; and the signal collected and transmitted by the second acquisition circuit is used to obtain the size of the signal. For example, the part of the signal output circuit connected to the second acquisition circuit is the output circuit of a monitoring device such as a temperature sensor and a pressure sensor; that is, the control module realizes qualitative judgment through the first acquisition circuit and realizes quantitative acquisition through the second acquisition circuit. The present application uses two acquisition circuits to collect and transmit the state of the device and the size of the signal, respectively, which improves the safety of signal transmission. When any acquisition circuit fails, the use of the other acquisition circuit is not affected.

[0054] Among them, based on the above embodiments, as a preferred embodiment, Figure 2As shown, the first acquisition circuit 1 also includes: a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a first diode D1; the first end of the first resistor R1 is connected to the first output end of the signal output circuit 3 as the input end of the first acquisition circuit 1, and the second end of the first resistor R1 is connected to the first input end of the bidirectional optical coupler T1; the first end of the second resistor R2 is connected to the power supply end VC, and the second end of the second resistor R2 and the first output end of the bidirectional optical coupler T1 are connected together as the output end of the first acquisition circuit 1 and the first input end of the control module 4; the first end of the third resistor R3 is connected to the second end of the second resistor R2 and the first output end of the bidirectional optical coupler T1, and the second end of the third resistor R3 is connected to the first input end of the control module 4 as the output end of the first acquisition circuit 1. The output end is connected to the first input end of the control module 4; the first end of the first capacitor C1 is connected to the second end of the first resistor R1 and the first input end of the bidirectional optocoupler T1, and the second end of the first capacitor C1 is connected to the first end of the second capacitor C2; the second end of the second capacitor C2 is connected to the second input end of the bidirectional optocoupler T1 and the second output end of the signal output circuit 3; the first end of the third capacitor C3 is connected to the first output end of the bidirectional optocoupler T1, the second end of the second resistor R2 and the first end of the third resistor R3, the second end of the third capacitor C3 is connected to the second output end of the bidirectional optocoupler T1 and is grounded; the first end of the first diode D1 is connected to the output end of the signal output circuit 3 as the input end of the first acquisition circuit 1, and the second end of the first diode D1 is connected to the first end of the first resistor R1.

[0055] Among them, the first diode D1 is used to prompt the input of the signal, and the first diode D1 is a light emitting diode; the first resistor R1 plays a role of current limiting protection for the first diode D1; the second resistor R2 is used as a pull-up resistor to achieve current limiting during operation and to pull up the voltage when there is no input signal; the third resistor R3 is used as a current limiting resistor to avoid impact on the control module 4; the first capacitor C1, the second capacitor C2 and the third capacitor C3 are used for signal filtering.

[0056] It should be noted that this application is only one possible implementation method, but is not limited to this implementation method and can be set according to user needs.

[0057] The present application provides a specific structure of a first acquisition circuit. Under this structure, when the bidirectional optocoupler in the first acquisition circuit is connected to the device, it is not necessary to distinguish between positive and negative poles, thus avoiding irreparable damage caused by incorrect positive and negative pole connection. At the same time, components such as resistors and capacitors in the circuit also provide safety protection for the first acquisition circuit and the control module.

[0058] Based on the above embodiments, as a preferred embodiment, Figure 3As shown, the second acquisition circuit includes: a second diode D2, a third diode D3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a fourth capacitor C4. Among them, the cathode of the second diode D2 is connected to the power supply terminal VC, the anode of the second diode D2 is connected to the cathode of the third diode D3, and the anode of the second diode D2 and the cathode of the third diode D3 are connected to the third output terminal of the signal output circuit 3 as the input terminal of the second acquisition circuit 2; the anode of the third diode D3 is grounded; the first end of the fourth resistor R4 is connected to the third output terminal of the signal output circuit 3 as the input terminal of the second acquisition circuit 2, and the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is connected to the second input terminal of the control module 4 as the output terminal of the second acquisition circuit 2; the first end of the sixth resistor R6 is connected to the second end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the fourth capacitor C4; the second end of the sixth resistor R6 is connected to the second end of the fourth capacitor C4 and is grounded.

[0059] Among them, the second diode D2 is used to clamp the input positive voltage; the third diode D3 is used to clamp the input negative voltage; the fourth resistor R4 and the fifth resistor R5 are used for voltage division; the sixth resistor R6 and the fourth resistor R4 form an RC filter circuit for filtering the signal collected by the second acquisition circuit 2.

[0060] It should be noted that this application is only one possible implementation method, but is not limited to this implementation method and can be set according to user needs.

[0061] The present application provides a specific structure of a second acquisition circuit, under which the second acquisition circuit acquires and transmits signals for obtaining the type and size of the signal. At the same time, components such as resistors and capacitors in the circuit also provide safety protection for the first acquisition circuit and the control module.

[0062] It can be seen that the bidirectional optocoupler in the first acquisition circuit in the present application does not need to distinguish between positive and negative poles when connected to the device, thus avoiding the problem of irreparable damage caused by incorrect connection of the positive and negative poles. At the same time, the signal collected and transmitted by the first acquisition circuit in the present application is used to characterize the state of the device, while the signal collected and transmitted by the second acquisition circuit is used to collect the size of the signal. The present application uses two acquisition circuits to collect and transmit the state of the device and the size of the signal, respectively, which improves the safety of signal transmission. When any acquisition circuit fails, it does not affect the use of the other acquisition circuit.

[0063] In order to solve the above technical problems, the present application also provides a signal acquisition device, such as Figure 4As shown, it includes the above-mentioned signal acquisition circuit. In addition, it also includes: a communication module 5 and a power supply module 6; wherein the communication module 5 is connected to the control module 4 to realize data transmission, such as outputting the collected signal to the host computer; the output end of the power supply module 6 is connected to the power supply end of the first acquisition circuit 1, the second acquisition circuit 2, and the power supply end of the control module 4, for powering its circuit.

[0064] Among them, as a preferred embodiment, the communication module is WIFI, Bluetooth, etc.

[0065] It should be noted that the specific circuit of the signal acquisition device provided in this application is only one possible way to implement, and can be set up according to the needs of the user. At the same time, this application does not limit the specific structure of the communication module 5 and the power module 6, and can be set up according to the needs of the user.

[0066] Since the specific embodiments of the signal acquisition device provided in this application are the same as the above embodiments, this application will not elaborate on them here.

[0067] The above is a detailed introduction to a signal acquisition circuit and a signal acquisition device provided by the utility model. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can refer to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0068] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A signal acquisition circuit, characterized in that: include: At least one first acquisition circuit, at least one second acquisition circuit and a control module; The first acquisition circuit includes a bidirectional optocoupler; The first input end of the bidirectional optocoupler is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, the second input end of the bidirectional optocoupler is connected to the second output end of the signal output circuit, the first output end of the bidirectional optocoupler is connected to the first input end of the control module as the output end of the first acquisition circuit, and the second output end of the bidirectional optocoupler is grounded; The input end of the second acquisition circuit is connected to the third output end of the signal output circuit, and the output end of the second acquisition circuit is connected to the second input end of the control module; The control module receives an output signal of the first acquisition circuit and an output signal of the second acquisition circuit and outputs acquisition data based on the output signal of the first acquisition circuit and the output signal of the second acquisition circuit.

2. The signal acquisition circuit according to claim 1, characterized in that: The first acquisition circuit further includes: a first resistor and a second resistor; The first end of the first resistor is connected to the first output end of the signal output circuit as the input end of the first acquisition circuit, and the second end of the first resistor is connected to the first input end of the bidirectional optocoupler; The first end of the second resistor is connected to the power supply end, and the second end of the second resistor and the first output end of the bidirectional optocoupler are connected to the first input end of the control module as the output end of the first acquisition circuit.

3. The signal acquisition circuit according to claim 2, characterized in that: The first acquisition circuit further includes: a third resistor; The first end of the third resistor is connected to the second end of the second resistor and the first output end of the bidirectional optocoupler, and the second end of the third resistor is connected to the first input end of the control module as the output end of the first acquisition circuit.

4. The signal acquisition circuit according to claim 3, characterized in that: The first acquisition circuit further includes: a first capacitor, a second capacitor and a third capacitor; The first end of the first capacitor is connected to the second end of the first resistor and the first input end of the bidirectional optocoupler, and the second end of the first capacitor is connected to the first end of the second capacitor; The second end of the second capacitor is connected to the second input end of the bidirectional optocoupler and the second output end of the signal output circuit; The first end of the third capacitor is connected to the first output end of the bidirectional optocoupler, the second end of the second resistor and the first end of the third resistor, and the second end of the third capacitor is connected to the second output end of the bidirectional optocoupler and is grounded.

5. The signal acquisition circuit according to claim 4, characterized in that: The first acquisition circuit further includes: a first diode; The first end of the first diode is connected to the output end of the signal output circuit as the input end of the first acquisition circuit, and the second end of the first diode is connected to the first end of the first resistor.

6. The signal acquisition circuit according to any one of claims 1 to 5, characterized in that: The second acquisition circuit includes: a second diode and a third diode; The cathode of the second diode is connected to the power supply end, and the anode of the second diode and the cathode of the third diode are connected to the third output end of the signal output circuit as the input end of the second acquisition circuit; An anode of the third diode is grounded.

7. The signal acquisition circuit according to claim 6, characterized in that: The second acquisition circuit further includes: a fourth resistor and a fifth resistor; The first end of the fourth resistor is connected to the third output end of the signal output circuit as the input end of the second acquisition circuit, and the second end of the fourth resistor is connected to the first end of the fifth resistor; The second end of the fifth resistor is connected to the second input end of the control module as the output end of the second acquisition circuit.

8. The signal acquisition circuit according to claim 7, characterized in that: The second acquisition circuit further includes: a sixth resistor and a fourth capacitor; The first end of the sixth resistor is connected to the second end of the fourth resistor, the first end of the fifth resistor and the first end of the fourth capacitor; The second end of the sixth resistor is connected to the second end of the fourth capacitor and is grounded.

9. A signal acquisition device, characterized in that: The invention comprises the signal acquisition circuit as described in any one of claims 1 to 8.

10. The signal acquisition device according to claim 9, characterized in that: Also includes: Communication module and power module; The communication module is connected to the control module; The output end of the power supply module is connected to the power supply end of the first acquisition circuit, the second acquisition circuit and the power supply end of the control module.

Images