A multi-type signal acquisition circuit

Abstract

The utility model relates to a kind of multiple types signal acquisition circuit, comprising: multiple groups of signal input unit, signal sampling unit, signal type judging unit, type acquisition unit and signal type identification unit;Each group of signal input unit includes: analog switch switch and sampling control switch;The input end of analog switch switch receives signal to be sampled, the input end of sampling control switch and the input end of signal type judging unit are connected respectively to the output end of analog switch switch, the output end of signal type judging unit is connected type acquisition unit, the input end of signal sampling unit is connected to the output end of sampling control switch, the output end of signal sampling unit is connected signal type identification unit. The utility model can realize the acquisition of multiple different types signals under the premise that different sampling circuits do not need to be set, and is good in compatibility, can be applied to different products, and the application range is significantly expanded.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and more specifically, to a signal acquisition circuit of various types. Background Technology

[0002] Currently, most sensor signal acquisition devices require corresponding sampling interfaces. For example, voltage signals are acquired using a specific voltage sensor interface, current signals using a specific current sensor interface, and pulse signals using a specific pulse sensor interface. Since different signal types require different sampling circuits, confusion can easily arise when multiple different types are needed. Furthermore, there are issues such as poor compatibility and lack of universality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a variety of signal acquisition circuits to address the problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a multi-type signal acquisition circuit, including: multiple sets of signal input units, signal sampling units, signal type judgment units, type acquisition units, and signal type identification units; each set of the signal input units includes: an analog switching switch and a sampling control switch;

[0005] The input terminal of the analog switching switch receives the signal to be sampled. The first output terminal of the analog switching switch is connected to the input terminal of the sampling control switch. The second output terminal of the analog switching switch is connected to the input terminal of the signal type determination unit. The output terminal of the signal type determination unit is connected to the type acquisition unit. The output terminal of the sampling control switch is connected to the input terminal of the signal sampling unit. The output terminal of the signal sampling unit is connected to the signal type identification unit. The signal type identification unit is also connected to the analog switching switch, the sampling control switch, the signal type determination unit, and the type acquisition unit.

[0006] In the various types of signal acquisition circuits described in this utility model, the signal sampling unit includes: multiple sets of signal sampling circuits or a signal sampling device;

[0007] The multiple signal sampling circuits are configured corresponding to the multiple signal input units; the input terminal of each signal sampling circuit is connected to the output terminal of its corresponding signal input unit, and the output terminal of each signal sampling circuit is connected to the signal type identification unit.

[0008] The input terminal of the signal sampling device is connected to the output terminal of the multiple signal input units, and the output terminal of the signal sampling device is connected to the signal type identification unit.

[0009] In the various types of signal acquisition circuits described in this utility model, each group of signal sampling circuits includes: a current signal sampling circuit, a voltage signal sampling circuit, and a pulse signal sampling circuit;

[0010] The input terminal of the current signal sampling circuit is connected to the second output terminal of the corresponding sampling control switch, and the output terminal of the current signal sampling circuit is connected to the signal type identification unit; the input terminal of the voltage signal sampling circuit is connected to the first output terminal of the corresponding sampling control switch, and the output terminal of the voltage signal sampling circuit is connected to the signal type identification unit; the input terminal of the pulse signal sampling circuit is connected to the third output terminal of the corresponding sampling control switch, and the output terminal of the pulse signal sampling circuit is connected to the signal type identification unit.

[0011] In the various types of signal acquisition circuits described in this utility model, the signal sampling device includes: a multi-signal sampling chip;

[0012] The input terminals of the multi-signal sampling chip are connected to the output terminals of the multiple signal input units, and the output terminal of the multi-signal sampling chip is connected to the signal type identification unit.

[0013] In the multi-type signal acquisition circuit described in this utility model, the signal type determination unit includes: a type determination switch and a type selection switch;

[0014] The input terminal of the type determination switch is connected to the second output terminal of the analog switching switch, the output terminal of the type determination switch is connected to the input terminal of the type selection switch, the output terminal of the type selection switch is connected to the type acquisition unit, and the control terminals of the type determination switch and the type selection switch are respectively connected to the signal type identification unit.

[0015] In the various types of signal acquisition circuits described in this utility model, the type acquisition unit includes: a current judgment acquisition circuit, a voltage judgment acquisition circuit, and a pulse judgment acquisition circuit;

[0016] The input terminal of the voltage judgment and acquisition circuit is connected to the first output terminal of the type selection switch, and the output terminal of the voltage judgment and acquisition circuit is connected to the signal type identification unit; the current judgment and acquisition circuit is connected to the second output terminal of the type selection switch, and the output terminal of the current judgment and acquisition circuit is connected to the signal type identification unit; the input terminal of the pulse judgment and acquisition circuit is connected to the third output terminal of the type selection switch, and the output terminal of the pulse judgment and acquisition circuit is connected to the signal type identification unit.

[0017] In the various types of signal acquisition circuits described in this utility model, the signal type identification unit includes: a microcontroller;

[0018] The microcontroller is used to control the analog switching switch, the sampling control switch, and the signal type judgment unit, and to identify the type of the signal to be sampled based on the type sampling signal output by the type acquisition unit, and to control the sampling control switch to select the signal sampling unit to sample the signal to be sampled according to the type of the signal to be sampled.

[0019] The various types of signal acquisition circuits described in this utility model also include: a data storage circuit;

[0020] The data storage circuit is connected to the microcontroller and is used to store the signal to be sampled.

[0021] The various types of signal acquisition circuits described in this utility model also include: a protection circuit;

[0022] The protection circuit is located at the power input terminal and is used to perform overvoltage, overcurrent and protection functions.

[0023] The various types of signal acquisition circuits described in this utility model also include: an electrostatic protection circuit;

[0024] The electrostatic discharge (ESD) protection circuit is located at the signal acquisition end and is used to perform ESD protection.

[0025] The multi-type signal acquisition circuit of this utility model has the following beneficial effects: it includes multiple signal input units, a signal sampling unit, a signal type judgment unit, a type acquisition unit, and a signal type identification unit; each signal input unit includes an analog switching switch and a sampling control switch; the input terminal of the analog switching switch receives the signal to be sampled, the output terminal of the analog switching switch is connected to the input terminal of the sampling control switch and the input terminal of the signal type judgment unit, the output terminal of the signal type judgment unit is connected to the type acquisition unit, the output terminal of the sampling control switch is connected to the input terminal of the signal sampling unit, and the output terminal of the signal sampling unit is connected to the signal type identification unit. This utility model can acquire multiple different types of signals without requiring different sampling circuits, has good compatibility, is applicable to different products, and significantly expands its scope of application. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0027] Figure 1 This is a block diagram illustrating the principles of various types of signal acquisition circuits provided in embodiments of this utility model;

[0028] Figure 2 This is a circuit schematic diagram of a single signal input unit provided in an embodiment of this utility model;

[0029] Figure 3 This is a circuit diagram of a single-group signal sampling circuit provided in an embodiment of the present invention;

[0030] Figure 4 This is a circuit diagram of the signal sampling device provided in an embodiment of the present invention;

[0031] Figure 5 This is a circuit diagram of the signal type determination unit provided in this embodiment of the utility model;

[0032] Figure 6 This is a circuit diagram of the type acquisition unit provided in this embodiment of the utility model;

[0033] Figure 7 This is a circuit diagram of the signal type identification unit provided in this embodiment of the utility model;

[0034] Figure 8 This is a circuit schematic diagram of the data storage circuit provided in an embodiment of the present invention;

[0035] Figure 9 This is a circuit diagram of the protection circuit provided in this embodiment of the utility model;

[0036] Figure 10 This is a circuit diagram of the electrostatic protection circuit provided in this embodiment of the utility model. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] To address the problems of poor compatibility and versatility caused by the current method of requiring dedicated interfaces for one-to-one signal sampling, this invention provides a multi-type signal acquisition circuit. This circuit can recognize multiple signal types and automatically select the appropriate sampling circuit. Only one set of this circuit is needed to acquire multiple signal types, eliminating the need for different acquisition circuits for different types, thus offering good compatibility and versatility. Furthermore, this multi-type signal acquisition circuit also features overvoltage, overcurrent, and electrostatic discharge protection functions, ensuring stable and reliable signal acquisition.

[0039] refer to Figure 1 , Figure 1 This is a schematic block diagram of a preferred embodiment of the various types of signal acquisition circuits provided by this utility model.

[0040] In this embodiment, such as Figure 1 As shown, the multi-type signal acquisition circuit includes: multiple signal input units 100, a signal sampling unit 200, a signal type judgment unit 400, a type acquisition unit 500, and a signal type identification unit 300. Specifically, the number of signal input units 100 is determined by the actual design; this invention does not impose a specific limitation, but mainly considers meeting the actual signal acquisition requirements. Furthermore, this invention employs a many-to-one configuration of multiple signal input units 100 and one signal type judgment unit 400, which significantly reduces the number of backend hardware components, lowers component costs, simplifies the circuit structure, and reduces space requirements.

[0041] Optionally, in this embodiment of the invention, each of the multiple signal input units 100 includes an analog switching switch and a sampling control switch. Specifically, the input terminal of the analog switching switch receives the signal to be sampled, the first output terminal of the analog switching switch is connected to the input terminal of the sampling control switch, the second output terminal of the analog switching switch is connected to the input terminal of the signal type judgment unit 400, the output terminal of the signal type judgment unit 400 is connected to the type acquisition unit 500, the output terminal of the sampling control switch is connected to the input terminal of the signal sampling unit 200, the output terminal of the signal sampling unit 200 is connected to the signal type identification unit 300, and the signal type identification unit 300 is also connected to the analog switching switch, the sampling control switch, the signal type judgment unit 400, and the type acquisition unit 500, respectively. Specifically, after the signal to be sampled is input to the analog switch, the analog switch switches one output to the sampling control switch and the other output to the signal type judgment unit 400. The signal type judgment unit 400 then outputs the signal to the type acquisition unit 500, which transmits it to the signal type identification unit 300. The signal type identification unit 300 identifies the type of the signal to be sampled, records the type, and then controls the sampling control switch to select the corresponding sampling circuit in the signal sampling unit 200. Thus, the corresponding sampling circuit transmits the signal to be sampled to the signal type identification unit 300.

[0042] Optionally, in this embodiment of the invention, the signal sampling unit 200 includes: multiple sets of signal sampling circuits or a signal sampling device. Multiple sets of signal sampling circuits are correspondingly configured with multiple sets of signal input units 100; the input terminal of each set of signal sampling circuits is connected to the output terminal of its corresponding signal input unit, and the output terminal of each set of signal sampling circuits is connected to the signal type identification unit 300; the input terminal of the signal sampling device is connected to the output terminals of multiple sets of signal input units 100, and the output terminal of the signal sampling device is connected to the signal type identification unit 300. That is, the signal sampling unit 200 can be configured in a many-to-many or many-to-one manner. Specifically, a corresponding number of signal sampling circuits can be configured according to the number of signal input units; alternatively, only one signal sampling device can be configured to correspond to multiple sets of signal sampling circuits, thereby sampling the signals output by the multiple sets of signal sampling circuits.

[0043] In some embodiments, when the signal sampling unit 200 is composed of multiple sets of signal sampling circuits, each set of signal sampling circuits includes: a current signal sampling circuit, a voltage signal sampling circuit, and a pulse signal sampling circuit. Specifically, the input terminal of the current signal sampling circuit is connected to the second output terminal of a corresponding sampling control switch, and the output terminal of the current signal sampling circuit is connected to the signal type identification unit 300; the input terminal of the voltage signal sampling circuit is connected to the first output terminal of a corresponding sampling control switch, and the output terminal of the voltage signal sampling circuit is connected to the signal type identification unit 300; the input terminal of the pulse signal sampling circuit is connected to the third output terminal of a corresponding sampling control switch, and the output terminal of the pulse signal sampling circuit is connected to the signal type identification unit 300.

[0044] Alternatively, in some other embodiments, when the signal sampling unit 200 is implemented using a single signal sampling device, the signal sampling device includes: a multi-signal sampling chip; the input terminals of the multi-signal sampling chip are respectively connected to the output terminals of multiple signal input units 100, and the output terminals of the multi-signal sampling chip are connected to the signal type identification unit 300.

[0045] Optionally, in some embodiments, the signal type determination unit 400 includes: a type determination switch and a type selection switch; the input terminal of the type determination switch is connected to the second output terminal of the analog switching switch, the output terminal of the type determination switch is connected to the input terminal of the type selection switch, the output terminal of the type selection switch is connected to the type acquisition unit 500, and the control terminals of the type determination switch and the type selection switch are respectively connected to the signal type identification unit 300.

[0046] In some embodiments, the type acquisition unit 500 includes: a current judgment acquisition circuit, a voltage judgment acquisition circuit, and a pulse judgment acquisition circuit; the input terminal of the voltage judgment acquisition circuit is connected to the first output terminal of the type selection switch, and the output terminal of the voltage judgment acquisition circuit is connected to the signal type identification unit 300; the current judgment acquisition circuit is connected to the second output terminal of the type selection switch, and the output terminal of the current judgment acquisition circuit is connected to the signal type identification unit 300; the input terminal of the pulse judgment acquisition circuit is connected to the third output terminal of the type selection switch, and the output terminal of the pulse judgment acquisition circuit is connected to the signal type identification unit 300.

[0047] Optionally, in this embodiment of the present invention, the signal type identification unit 300 includes: a microcontroller; the microcontroller is used to control the analog switching switch, the sampling control switch, and the signal type judgment unit 400, and to identify the type of the signal to be sampled based on the type sampling signal output by the type acquisition unit 500, and to control the sampling control switch to select the signal sampling unit 200 to sample the signal to be sampled according to the type of the signal to be sampled.

[0048] Furthermore, this multi-type signal acquisition circuit also includes a data storage circuit; the data storage circuit is connected to a microcontroller and is used to store the sampled signal. This invention, by setting up this data storage circuit, can achieve the recording and saving of data.

[0049] Furthermore, this multi-type signal acquisition circuit also includes a protection circuit; the protection circuit is located at the power input terminal and is used to perform overvoltage, overcurrent, and reverse protection. This utility model can achieve overvoltage, overcurrent, and reverse protection by incorporating this protection circuit.

[0050] Furthermore, the multi-type signal acquisition circuit also includes an electrostatic discharge (ESD) protection circuit; the ESD protection circuit is installed at the signal acquisition end and is used to perform ESD protection.

[0051] The following describes each unit and circuit using specific embodiments.

[0052] refer to Figures 2 to 10 , Figures 2 to 10 The specific circuit diagrams for each unit and circuit are provided.

[0053] like Figures 2 to 10As shown, each signal input unit includes an analog switching switch and a sampling control switch. U53 is the analog switching switch, and U52 is the sampling control switch. The signal type judgment unit 400 includes a type judgment switch and a type selection switch. U58 is the type judgment switch, and U55 is the type selection switch. The current signal sampling circuit includes a differential operational amplifier and its peripheral circuits; the pulse signal sampling circuit includes a zero-crossing comparator and its peripheral circuits; and the voltage signal sampling circuit includes a voltage follower and its peripheral circuits. In the current signal sampling circuit, U60A is a differential operational amplifier. In the pulse signal sampling circuit, U59A is a zero-crossing comparator. In the voltage signal sampling circuit, U59B is a voltage follower. The current judgment acquisition circuit includes a differential operational amplifier and its peripheral circuits; the pulse judgment acquisition circuit includes a zero-crossing comparator and its peripheral circuits; and the voltage judgment acquisition circuit includes a voltage follower and its peripheral circuits. In the current judgment acquisition circuit, U57A is a differential operational amplifier. In the pulse judgment acquisition circuit, U56A is a zero-crossing comparator. In the voltage judgment and acquisition circuit, U56B is a voltage follower. As mentioned above, the current judgment and acquisition circuit and the current signal sampling circuit use the same circuit structure design; the voltage judgment and acquisition circuit and the voltage signal sampling circuit use the same circuit structure design; the pulse judgment and acquisition circuit and the pulse signal sampling circuit use the same circuit structure design. U51 is a microcontroller. U61 is a multi-signal sampling chip. U54 is a data storage circuit.

[0054] like Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7As shown, the first pin of U53 is connected to the signal to be sampled (any one of SINGLEIN_01, ..., SINGLEIN_07; these seven signals are only examples and the specific number is not limited) through resistor R452. The second pin of U53 is the first output terminal of the analog switch, and the eighth pin of U53 is the second output terminal of the analog switch. Specifically, the second pin of U53 is connected to the sixth pin of U52, and the eighth pin of U53 is connected to the fourth, fifth, sixth, seventh, sixteenth, fifteenth, and fourteenth pins of U58. The eighth pin of U58 is connected to the sixth pin of U55. The fifth pin of U53 is connected to the sixty-fourth pin of U51, and the sixth pin of U53 is connected to the tenth pin of U51. The second pin of U52 is connected to the fifty-fourth pin of U51, the first pin of U52 is connected to the fourth pin of U51, and the fourteenth pin of U52 is connected to the third pin of U51. Pin 1 of U58 connects to pin 1.31 of U51; pin 20 of U58 connects to pin 1.30 of U51; pin 19 of U58 connects to pin 1.29 of U51; pin 2 of U58 connects to pin 1.32 of U51. Pin 2 of U55 connects to pin 1.25 of U51; pin 1 of U55 connects to pin 1.24 of U51; pin 14 of U55 connects to pin 1.23 of U51.

[0055] Pin 4 of U52 is connected to the positive input of U59B via resistors R481 and R479. The output of U59B is connected to pin 4 of U51 via resistor R482. Pin 5 of U52 is connected to the positive input of U60A via resistors R485 and R487. The output of U60A is connected to pin 6 of U51 via resistor R472. Pin 11 of U52 is connected to the positive input of U59A via resistors R474 and R477. The output of U59A is connected to pin 5 of U51 via resistor R484. Pin 4 of U55 is connected to the positive input of U56B via resistors R460 and R458. The output of U56B is connected to pin 7 of U51 via resistor R461. Pin 5 of U55 is connected to the positive input of U57A via resistors R464 and R466. The output of U57A is connected to pin 109 of U51 via resistor R470. Pin 11 of U55 is connected to the positive input of U56A via resistors R453 and R456. The output of U56A is connected to pin 108 of U51 via resistor R463. Pin 5 of U54 is connected to pin 144 of U51, pin 6 of U54 is connected to pin 143 of U51, pin 2 of U54 is connected to pin 142 of U51, and pin 1 of U54 is connected to pin 1 of U51.

[0056] When the sensor outputs a voltage signal, it has a defined voltage amplitude range and voltage type (DC, AC). The voltage signal is isolated from the influence of the preceding and following stages by a voltage follower, and after preprocessing by a voltage divider circuit and an amplifier circuit, it enters the microcontroller for ADC sampling, typically at a 12-bit frequency. The microcontroller compares the ADC signal with a reference voltage, and the data is stored by a data storage circuit. When the sensor outputs a current signal, unlike a voltage signal, the current signal needs to be converted to voltage by the sensor or a resistor before measurement. This conversion is performed by the aforementioned current signal sampling circuit before being recognized and acquired by the microcontroller. When the output is a PWM pulse signal, optocouplers are generally used for isolation, and Schmitt triggers are used to eliminate ringing and improve the edge slope. The processed signal is then input to the microcontroller for nanosecond-level synchronization, completing the signal recognition and acquisition.

[0057] Specifically, as shown in the figure, when the signals to be sampled (SINGLEIN_01, ..., SINGLEIN_07) are input, they are switched through U53 (TMUX6219). One path (S1) is transmitted to the subsequent stage U52, and the other path (S2) is transmitted to U58 (TMUX7348). From U58, the signals are transmitted to U55. The subsequent stages of U55 are connected to the current judgment and acquisition circuit (U57A and its peripheral circuit), the pulse judgment and acquisition circuit (U56A and its peripheral circuit), and the voltage judgment and acquisition circuit (U56B and its peripheral circuit). These three judgment and acquisition circuits transmit the signals to U51, which performs type identification and recording, and classifies the acquired signals. After identifying the type of the signal to be sampled... Then, returning to U53 (TMUX6219), the control path of U51 is used to select S1 (i.e., the second pin of U53 is selected). At this time, the second pin of U53 outputs the signal to be sampled to the sixth pin of U52, and U51 controls U52 to control its corresponding pin to output the corresponding signal. That is, if it is a voltage signal, the fourth pin of U52 outputs the signal to be sampled and it is sampled by the voltage signal sampling circuit of the subsequent stage and then input to U51; if it is a current signal, the fifth pin of U52 outputs the signal to be sampled and it is sampled by the current signal sampling circuit of the subsequent stage and then input to U51; if it is a pulse signal, the eleventh pin of U52 outputs the signal to be sampled and it is sampled by the pulse signal sampling circuit of the subsequent stage and then input to U51.

[0058] Furthermore, such as Figure 9 As shown, this protection circuit can achieve overvoltage, overcurrent and reverse protection at the power supply terminal using devices such as fuse F1, diode D1, Zener diode D2, transistor Q2, and MOSFET Q1.

[0059] like Figure 10As shown in the embodiment of this utility model, electrostatic protection can also be achieved by setting electrostatic protection tubes D80 and D81 at the signal acquisition end.

[0060] This invention, through the design of various signal acquisition circuits, enables automatic signal type identification and selection of the appropriate signal sampling circuit. It also features overvoltage, overcurrent, reverse polarity protection, and electrostatic discharge protection. Compatible with different signal types, it boasts excellent versatility and significantly improved applicability and scope. These various signal acquisition circuits can be applied to multiple fields, including power management, motor control, battery monitoring, and communications.

[0061] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They do not limit the scope of protection of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should fall within the scope of the claims of this utility model.

Claims

1. A multi-type signal acquisition circuit, characterized in that, include: The system includes multiple signal input units, signal sampling units, signal type judgment units, type acquisition units, and signal type identification units; each of the signal input units includes an analog switching switch and a sampling control switch. The input terminal of the analog switching switch receives the signal to be sampled. The first output terminal of the analog switching switch is connected to the input terminal of the sampling control switch. The second output terminal of the analog switching switch is connected to the input terminal of the signal type determination unit. The output terminal of the signal type determination unit is connected to the type acquisition unit. The output terminal of the sampling control switch is connected to the input terminal of the signal sampling unit. The output terminal of the signal sampling unit is connected to the signal type identification unit. The signal type identification unit is also connected to the analog switching switch, the sampling control switch, the signal type determination unit, and the type acquisition unit.

2. The various types of signal acquisition circuits according to claim 1, characterized in that, The signal sampling unit includes: multiple signal sampling circuits or a signal sampling device; The multiple signal sampling circuits are configured corresponding to the multiple signal input units; the input terminal of each signal sampling circuit is connected to the output terminal of its corresponding signal input unit, and the output terminal of each signal sampling circuit is connected to the signal type identification unit. The input terminal of the signal sampling device is connected to the output terminal of the multiple signal input units, and the output terminal of the signal sampling device is connected to the signal type identification unit.

3. The various types of signal acquisition circuits according to claim 2, characterized in that, Each set of signal sampling circuits includes: a current signal sampling circuit, a voltage signal sampling circuit, and a pulse signal sampling circuit; The input terminal of the current signal sampling circuit is connected to the second output terminal of the corresponding sampling control switch, and the output terminal of the current signal sampling circuit is connected to the signal type identification unit; the input terminal of the voltage signal sampling circuit is connected to the first output terminal of the corresponding sampling control switch, and the output terminal of the voltage signal sampling circuit is connected to the signal type identification unit; the input terminal of the pulse signal sampling circuit is connected to the third output terminal of the corresponding sampling control switch, and the output terminal of the pulse signal sampling circuit is connected to the signal type identification unit.

4. The various types of signal acquisition circuits according to claim 2, characterized in that, The signal sampling device includes: a multi-signal sampling chip; The input terminals of the multi-signal sampling chip are connected to the output terminals of the multiple signal input units, and the output terminal of the multi-signal sampling chip is connected to the signal type identification unit.

5. The various types of signal acquisition circuits according to claim 1, characterized in that, The signal type determination unit includes: a type determination switch and a type selection switch; The input terminal of the type determination switch is connected to the second output terminal of the analog switching switch, the output terminal of the type determination switch is connected to the input terminal of the type selection switch, the output terminal of the type selection switch is connected to the type acquisition unit, and the control terminals of the type determination switch and the type selection switch are respectively connected to the signal type identification unit.

6. The various types of signal acquisition circuits according to claim 5, characterized in that, The acquisition unit of this type includes: a current judgment acquisition circuit, a voltage judgment acquisition circuit, and a pulse judgment acquisition circuit; The input terminal of the voltage judgment and acquisition circuit is connected to the first output terminal of the type selection switch, and the output terminal of the voltage judgment and acquisition circuit is connected to the signal type identification unit; the current judgment and acquisition circuit is connected to the second output terminal of the type selection switch, and the output terminal of the current judgment and acquisition circuit is connected to the signal type identification unit; the input terminal of the pulse judgment and acquisition circuit is connected to the third output terminal of the type selection switch, and the output terminal of the pulse judgment and acquisition circuit is connected to the signal type identification unit.

7. The signal acquisition circuit of various types according to any one of claims 1-6, characterized in that, The signal type identification unit includes: a microcontroller; The microcontroller is used to control the analog switching switch, the sampling control switch, and the signal type judgment unit, and to identify the type of the signal to be sampled based on the type sampling signal output by the type acquisition unit, and to control the sampling control switch to select the signal sampling unit to sample the signal to be sampled according to the type of the signal to be sampled.

8. The various types of signal acquisition circuits according to claim 7, characterized in that, Also includes: Data storage circuit; The data storage circuit is connected to the microcontroller and is used to store the signal to be sampled.

9. The various types of signal acquisition circuits according to claim 7, characterized in that, Also includes: Protection circuit; The protection circuit is located at the power input terminal and is used to perform overvoltage, overcurrent and protection functions.

10. The various types of signal acquisition circuits according to claim 7, characterized in that, Also includes: Electrostatic discharge protection circuit; The electrostatic discharge (ESD) protection circuit is located at the signal acquisition end and is used to perform ESD protection.

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