Signal acquisition equipment and system

Abstract

The utility model discloses signal acquisition equipment, which is used for data acquisition or testing and comprises a control module and a plurality of signal acquisition channels, and the control module is connected with the signal acquisition channels. The signal acquisition channel is used for connecting a target object; the working state of the signal acquisition channel comprises at least two of an analog voltage acquisition state, a digital voltage acquisition state, an analog current acquisition state and a digital current acquisition state; the signal acquisition channel comprises a plurality of input ends, the signal acquisition channel is configured to be connected with a target object through two input ends in any working state, and the two input ends, used for being connected with the target object, of the signal acquisition channel in any two working states are all the same or partially the same. The signal acquisition equipment provided by the utility model is provided with a plurality of signal acquisition channels, each signal acquisition channel supports a plurality of working states, the signal acquisition channels have very strong universality, and a user can configure the signal acquisition channels into different states according to different requirements.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of data transmission, in particular to a signal acquisition device and system. BACKGROUND

[0002] In the application scenarios of data acquisition and testing, a data acquisition card is often needed for data acquisition. The data acquisition card includes a digital signal acquisition channel for digital signal acquisition and an analog signal acquisition channel for analog signal acquisition, and can acquire digital signals and analog signals.

[0003] Generally, the data acquisition card includes multiple digital signal acquisition channels and multiple analog signal acquisition channels. The multiple acquisition channels can simultaneously acquire data. However, due to the limited size of the data acquisition card, the number of acquisition channels that can be provided for connecting the objects to be acquired is limited. When the number of channels of the type required by the user does not meet the requirements, multiple data acquisition cards have to be used, which brings inconvenience to the user. SUMMARY

[0004] The embodiments of the present application provide a signal acquisition device and system. The signal acquisition device has multiple signal acquisition channels. The multiple signal acquisition channels can work simultaneously. Each signal acquisition channel supports multiple working states. Therefore, the signal acquisition channel has strong versatility. The user can configure the signal acquisition channel to different states according to different needs, effectively overcoming the problem that multiple signal acquisition devices need to be used due to the insufficient number of channels of the type required.

[0005] The embodiments of the present application provide a signal acquisition device for data acquisition or testing. The signal acquisition device includes a control module and multiple signal acquisition channels. The control module is connected with the signal acquisition channels. The signal acquisition channels are used to connect target objects. The target objects include any one or more of the following: an electronic device installed on a vehicle, a measured object, and an auxiliary device used to assist the measured object in testing. The working states of the signal acquisition channels include at least two of the following: an analog voltage acquisition state, a digital voltage acquisition state, an analog current acquisition state, and a digital current acquisition state. The signal acquisition channel includes multiple input terminals. When the signal acquisition channel is configured to any working state, the signal acquisition channel connects the target objects through two input terminals. The two input terminals of the signal acquisition channel for connecting the target objects in any two working states are all the same or partially the same.

[0006] The embodiments of the present application provide a system for data acquisition or testing. The system includes a host and a signal interaction device. The signal interaction device is used to connect between the host and a target object. One type of the signal interaction device is the above-mentioned signal acquisition device. The control module is used to acquire the output signal of the target object from the signal acquisition channel and send the output signal to the host. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0008] Figure 1 is a schematic diagram of an application scenario of a signal acquisition device provided in the embodiments of the present application;

[0009] Figure 2 is a structural schematic diagram of a signal acquisition device provided in the embodiments of the present application;

[0010] Figure 3 is a structural schematic diagram of an analog voltage sampling circuit provided in the embodiments of the present application;

[0011] Figure 4 is a structural schematic diagram of a digital voltage sampling circuit provided in the embodiments of the present application;

[0012] Figure 5 is a structural schematic diagram of an analog current sampling circuit and a digital current sampling circuit provided in the embodiments of the present application;

[0013] Figure 6 is a structural schematic diagram of an analog voltage analog-digital conversion unit and an analog current analog-digital conversion unit provided in the embodiments of the present application;

[0014] Figure 7 is a structural schematic diagram of a digital voltage threshold voltage comparison unit and a digital current threshold voltage comparison unit provided in the embodiments of the present application;

[0015] Figure 8 is a structural schematic diagram of a double-threshold comparator provided in the embodiments of the present application;

[0016] Figure 9 is a structural schematic diagram of a signal acquisition channel provided in the embodiments of the present application;

[0017] Figure 10 is a structural schematic diagram of a signal acquisition channel provided in the embodiments of the present application;

[0018] Figure 11 is a structural schematic diagram of a signal acquisition channel provided in the embodiments of the present application;

[0019] Figure 12 is a structural schematic diagram of a signal acquisition channel provided in the embodiments of the present application;

[0020] Figure 13This is a schematic diagram of the overcurrent protection circuit and fault injection module provided in the embodiments of this application;

[0021] Figure 14 This is a schematic diagram of the backplane and the connector on the backplane provided in the embodiments of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. At the same time, in the description of the embodiments of this application, terms, etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly and specifically defined.

[0023] In the application scenarios of this application embodiment, such as Figure 1 As shown, the signal acquisition device connects to the target object to acquire signals emitted by the target object. The acquired data can be stored in the device's own memory. The signal acquisition device can also be connected to a storage device simultaneously, where the acquired data can be stored. Alternatively, the signal acquisition device can be connected to a host computer, sending the acquired data to the host so that the host can obtain the signals emitted by the target object, thereby enabling data acquisition, testing, and other operations on the target object. Furthermore, during data acquisition or testing, the host computer can connect to one or multiple signal acquisition devices. One signal acquisition device can connect to one target object or multiple target objects simultaneously. In addition, application scenarios are also possible where the signal acquisition device connects to the host, storage device, and target object simultaneously, or where the host computer is also connected to a storage device.

[0024] In one example, the target object could be an electronic device installed on a vehicle. In this case, the host connects to the target object and collects data from it. The target object serves as the data source, and the host can receive and record signals emitted by the target object, thus achieving data collection. Furthermore, during the data collection process, the host can also send trigger signals, feedback signals, and other signals to the target object to induce it to output signals.

[0025] The vehicle can be a vehicle, a high-speed train, a drone, an airplane, etc. The vehicle is equipped with electronic devices, including sensors, controllers, and actuators. For example, the sensors can be cameras, laser radars, temperature sensors, acceleration sensors, gyroscopes, GPS, etc. The controllers can be electronic control units (ECUs), battery management units, cockpit controllers, flight control units, etc. The actuators can be motors, engines, speakers, etc.

[0026] In one example, the target object can be a device under test. In this case, the host is connected to the target object to test the target object. The target object can refer to a device under test in a hardware-in-the-loop (HIL) test. For example, the target object can be a controller in the development process and / or in the verification phase.

[0027] In one example, the target object can include electronic devices installed on a vehicle and a device under test, such as a device under test mounted on a vehicle for testing in an actual operating environment.

[0028] In one example, the target object can be an auxiliary device for assisting a device under test in testing, such as additional sensors, controllers, actuators, etc. For example, a simulation device for simulating sensors and actuators. For example, a test bench for simulating part of the electrical system of a vehicle for software algorithm testing. For example, a driver operation test bench. In the case of rapid prototype (RCP) testing, the host runs the software under test (e.g., algorithms, models, etc.), and the target object connected to the host is the sensor, actuator, etc. connected to the vehicle when the software under test is applied to the vehicle.

[0029] In one example, the target object can include a device under test and an auxiliary device for assisting the device under test in testing, such as additional sensors, controllers, actuators, etc. in addition to the original sensors of the vehicle when testing the ECU, to obtain more abundant data and facilitate analysis of test results.

[0030] In one example, the host can be any circuit, circuit board, or device with a processor, such as a circuit board or combination of multiple circuit boards with a processor. For example, it can also include a circuit board with a processor and a mechanical structure such as a housing. The processor can be used to run an operating system. The operating system configured in the host can be a real-time operating system or a desktop operating system. For example, the real-time operating system can be a QNX operating system, a Linux operating system, etc. The desktop operating system can be a Windows operating system, a Mac operating system, etc.

[0031] In some examples, the host is configured with a real-time operating system, which can ensure that a response to an event is made within a predetermined time, which is important for time-sensitive tasks. The host can serve as an industrial computer, i.e., a lower computer, during data collection or testing, and has high real-time performance and reliability. The host can obtain data sent by a target object through a signal acquisition device, and directly control the data collection and testing process of the target object. For example, the host can collect information from the target object, and send instructions to the target object. Figure 1 As shown in FIG. 8, the host can also be connected to a computing device, which is equipped with a desktop operating system. The computing device can serve as an upper computer, and is connected to the industrial computer. The upper computer can control the data collection and testing process of the target object by controlling the industrial computer. The computing device can be a server, a computer, a tablet, or a circuit board with a processor that can run an operating system. The computing device can run target software, such as simulation software or data analysis software, to assist the host in testing and data collection.

[0032] The industrial computer can be used to control the testing process, including running test cases and sending simulation signals to the target object. The industrial computer can also be used to control the data collection process, including adding timestamps to collected data, and filtering collected data. During data collection or testing, the industrial computer can be connected to the user through the upper computer to realize human-computer interaction, so that the user can monitor and / or influence the testing or data collection performed by the industrial computer through the upper computer. The influence can include selection and configuration of the testing environment and test cases before and during testing or data collection, and configuration of the collection frequency and storage path.

[0033] It should be noted that the host can be connected to the computing device during the entire data collection and testing process, or can be connected to the computing device during part of the data collection and testing process, such as before the data collection and testing process starts, or during the data collection and testing process.

[0034] In some examples, the host is configured with a desktop operating system, which provides a user-friendly graphical interface, allowing users to intuitively interact with the host, and supports the installation of a wide range of application software. The host can serve as an industrial computer during data collection or testing, and does not need to be connected to a computing device as an upper computer. The host itself can provide a user interface, and can obtain data sent by a target object through a signal acquisition device, and directly control the data collection and testing process of the target object, such as collecting information from the target object, and sending instructions to the target object. Although the real-time performance and stability of the desktop operating system are lower than those of the real-time operating system, the desktop operating system can still meet the requirements of some data collection or testing scenarios that do not require high real-time performance.

[0035] The number of industrial computers can be zero, one or more during data acquisition or testing, that is, the number of host computers can be one or more, and the host computer can also be connected to a computing device as an upper computer. The test system can be at least one of an HIL test system, an RCP test system, a simulation test system, a back-annotation test system, etc.

[0036] The embodiment of the present application provides a signal acquisition device, such as Figure 2 As shown, the signal acquisition device comprises a control module and a plurality of signal acquisition channels, the control module being connected to the signal acquisition channels; the signal acquisition channels are used to connect target objects; the working states of the signal acquisition channels comprise at least two of an analog voltage acquisition state, a digital voltage acquisition state, an analog current acquisition state and a digital current acquisition state; the signal acquisition channels comprise a plurality of input ends, and the signal acquisition channels are configured to connect the target objects through two input ends in any working state, and the two input ends used to connect the target objects in different working states are all the same or partially the same.

[0037] One signal acquisition channel is used to connect one communication medium connected to a target object, wherein one target object can be connected to at least one communication medium, and the communication medium is a medium for transmitting signals, which can be a signal line, a signal terminal, etc. Different types of communication media differ in the types of signals transmitted. The types of communication media include: analog voltage signal communication medium, digital voltage signal communication medium, analog current signal communication medium and digital current signal communication medium.

[0038] It can be seen that the signal acquisition module provided by the present application has a plurality of signal acquisition channels, the plurality of signal acquisition channels can work simultaneously, each signal acquisition channel supports a plurality of working states, and therefore, the signal acquisition channel has strong versatility, can connect different types of communication media and receive different types of signals, and a user can configure the signal acquisition channel to different states according to different needs, thereby effectively overcoming the problem that a plurality of signal acquisition devices need to be used due to insufficient number of required types of channels.

[0039] Exemplarily, each signal acquisition channel of the signal acquisition device comprises the same working states.

[0040] Exemplarily, at least two signal acquisition channels of the signal acquisition device comprise different working states. For example, the signal acquisition channel 1 comprises four working states of an analog voltage acquisition state, a digital voltage acquisition state, an analog current acquisition state and a digital current acquisition state, and the signal acquisition channel 2 comprises only two working states of an analog voltage acquisition state and a digital voltage acquisition state.

[0041] Exemplarily, the working state of the signal collection channel is configured to match the signal type of the connected communication medium, for example, when the signal collection channel is connected to an analog current signal communication medium, the working state is configured to be an analog current collection state. When multiple signal collection channels of the signal collection device are working simultaneously, each signal collection channel is configured to be one working state, and the multiple signal collection channels are independent of each other.

[0042] Exemplarily, the signal collection channel has multiple input ends, the input ends are used to connect target objects to receive input signals, when the signal collection channel is configured to be one working state, the target objects are connected and the input signals are received through the two input ends corresponding to the working state, wherein the two input ends used to connect the target objects and receive the input signals of the signal collection channel in different working states are all the same or partially the same.

[0043] Each working state of the signal collection channel corresponds to two input ends: in the analog voltage collection state, one input end receives the voltage output by the target object, and the other input end is grounded or connected to a reference voltage; in the digital voltage collection state, one input end receives the voltage output by the target object, and the other input end is grounded or connected to a reference voltage; in the analog current collection state, one input end receives the current output by the target object, and the other input end is connected to a load; in the digital current collection state, one input end receives the current output by the target object, and the other input end is connected to a load.

[0044] For example, the two input ends of the signal collection channel used to receive input signals in the analog voltage collection state are the same two input ends as the two input ends of the signal collection channel used to receive input signals in the digital voltage collection state. For example, the two input ends of the signal collection channel used to receive input signals in the analog current collection state are the same two input ends as the two input ends of the signal collection channel used to receive input signals in the digital current collection state.

[0045] For example, the two input terminals of the signal acquisition channel in the voltage acquisition state (analog voltage acquisition state and / or digital voltage acquisition state) for receiving the input signal and the two input terminals of the signal acquisition channel in the current acquisition state (analog current acquisition state and / or digital current acquisition state) for receiving the input signal have one same input terminal, that is, the signal acquisition channel includes a common input terminal which receives the voltage output by the target object in the voltage acquisition state and receives the current output by the target object in the current acquisition state. Specifically, the signal acquisition channel includes three input terminals: DUT, DUT ref, and load. In the voltage acquisition state, the DUT receives the voltage output by the target object, and the DUT ref is grounded or connected to a reference voltage. In the current acquisition state, the DUT receives the current output by the target object, and the load is connected to a load.

[0046] Therefore, the signal acquisition channel can share the same input terminal in different working states, and does not need to use independent input terminals in each working state, thereby reducing the number of input terminals, effectively controlling the occupied space of each signal acquisition channel, enabling the signal acquisition device to have more signal acquisition channels, and alleviating the problem of needing to use multiple signal acquisition devices due to insufficient number of signal acquisition channels.

[0047] From the circuit structure, the signal acquisition channel includes a front-end sampling circuit and a rear-end conversion circuit. The front-end sampling circuit is used to receive the to-be-tested signal. The to-be-tested signal is applied to the front-end sampling circuit and is converted into a voltage signal by a resistor and an operational amplifier in the front-end sampling circuit. The size of the voltage signal is affected by the to-be-tested signal, and thus the size of the to-be-tested signal can be obtained according to the size of the voltage signal. However, the voltage signal converted by the operational amplifier cannot be directly input to the control module, and thus the rear-end conversion circuit is needed to perform signal conversion on the voltage signal converted by the operational amplifier before sending the voltage signal to the control module.

[0048] In one example, the front-end sampling circuit includes an analog voltage sampling circuit and a digital voltage sampling circuit, and the rear-end conversion circuit includes an analog voltage analog-digital conversion unit and a digital voltage threshold voltage comparison unit. The analog voltage sampling circuit is connected to the analog voltage analog-digital conversion unit, and the digital voltage sampling circuit is connected to the digital voltage threshold voltage comparison unit.

[0049] In one example, the front-end sampling circuit includes an analog current sampling circuit and a digital current sampling circuit, and the rear-end conversion circuit includes an analog current analog-digital conversion unit and a digital current threshold voltage comparison unit. The analog current sampling circuit is connected to the analog current analog-digital conversion unit, and the digital current sampling circuit is connected to the digital current threshold voltage comparison unit.

[0050] In one example, the front-end sampling circuit includes an analog voltage sampling circuit and an analog current sampling circuit, and the back-end conversion circuit includes an analog voltage analog-to-digital conversion unit and an analog current analog-to-digital conversion unit, the analog voltage sampling circuit is connected to the analog voltage analog-to-digital conversion unit, and the analog current sampling circuit is connected to the analog current analog-to-digital conversion unit.

[0051] In one example, the front-end sampling circuit includes a digital voltage sampling circuit and a digital current sampling circuit, and the back-end conversion circuit includes a digital voltage threshold voltage comparison unit and a digital current threshold voltage comparison unit, the digital voltage sampling circuit is connected to the digital voltage threshold voltage comparison unit, and the digital current sampling circuit is connected to the digital current threshold voltage comparison unit.

[0052] In one example, the front-end sampling circuit includes an analog voltage sampling circuit, an analog current sampling circuit, and a digital voltage sampling circuit, and the back-end conversion circuit includes an analog voltage analog-to-digital conversion unit, an analog current analog-to-digital conversion unit, and a digital voltage threshold voltage comparison unit, the analog voltage sampling circuit is connected to the analog voltage analog-to-digital conversion unit, the analog current sampling circuit is connected to the analog current analog-to-digital conversion unit, and the digital voltage sampling circuit is connected to the digital voltage threshold voltage comparison unit.

[0053] In one example, the front-end sampling circuit includes an analog voltage sampling circuit, a digital current sampling circuit, and a digital voltage sampling circuit, and the back-end conversion circuit includes an analog voltage analog-to-digital conversion unit, a digital current threshold voltage comparison unit, and a digital voltage threshold voltage comparison unit, the analog voltage sampling circuit is connected to the analog voltage analog-to-digital conversion unit, the digital current sampling circuit is connected to the digital current threshold voltage comparison unit, and the digital voltage sampling circuit is connected to the digital voltage threshold voltage comparison unit.

[0054] In one example, the front-end sampling circuit includes an analog current sampling circuit, an analog voltage sampling circuit, and a digital current sampling circuit, and the back-end conversion circuit includes an analog current analog-to-digital conversion unit, an analog voltage analog-to-digital conversion unit, and a digital current threshold voltage comparison unit, the analog current sampling circuit is connected to the analog current analog-to-digital conversion unit, the analog voltage sampling circuit is connected to the analog voltage analog-to-digital conversion unit, and the digital current sampling circuit is connected to the digital current threshold voltage comparison unit.

[0055] In one example, the front-end sampling circuit includes an analog current sampling circuit, a digital voltage sampling circuit, and a digital current sampling circuit, and the back-end conversion circuit includes an analog current analog-to-digital conversion unit, a digital voltage threshold voltage comparison unit, and a digital current threshold voltage comparison unit, the analog current sampling circuit is connected to the analog current analog-to-digital conversion unit, the digital voltage sampling circuit is connected to the digital voltage threshold voltage comparison unit, and the digital current sampling circuit is connected to the digital current threshold voltage comparison unit.

[0056] In one example, the front-end sampling circuit includes an analog voltage sampling circuit, a digital voltage sampling circuit, an analog current sampling circuit, and a digital current sampling circuit, the back-end conversion circuit includes an analog voltage analog-digital conversion unit, a digital voltage threshold voltage comparison unit, an analog current analog-digital conversion unit, and a digital current threshold voltage comparison unit, the analog voltage sampling circuit is connected to the analog voltage analog-digital conversion unit, the digital voltage sampling circuit is connected to the digital voltage threshold voltage comparison unit, the analog current sampling circuit is connected to the analog current analog-digital conversion unit, and the digital current sampling circuit is connected to the digital current threshold voltage comparison unit.

[0057] In some examples, as shown in FIG. 1a, the analog voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, each voltage dividing resistor is connected to an operational amplifier, and the operational amplifier is configured to collect a voltage difference formed by the voltage dividing resistor. Figure 3 a, the digital voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, each voltage dividing resistor is connected to an operational amplifier, and the operational amplifier is configured to collect a voltage difference formed by the voltage dividing resistor.

[0058] In some examples, as shown in FIG. 1a, the analog voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, each voltage dividing resistor is connected to an operational amplifier, and the operational amplifier is configured to collect a voltage difference formed by the voltage dividing resistor. Figure 4 a, the digital voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, each voltage dividing resistor is connected to an operational amplifier, and the operational amplifier is configured to collect a voltage difference formed by the voltage dividing resistor.

[0059] Further, as shown in FIG. 1a and FIG. 1b, the first gear switch selector and the second gear switch selector can be a multiplexer MUX, which can select one input signal from a plurality of input signals and output the selected input signal to a single output terminal. In addition, it is not excluded that the gear switch selector is realized by other means, for example, a plurality of groups of switches are provided to select one input signal from a plurality of input signals, and a control module is configured to control the gear switch selector to select an output terminal of one operational amplifier to be connected to the back-end conversion circuit, and the output signal of the selected operational amplifier is used to determine the size of the to-be-measured signal. Figure 3 a, Figure 4 a, the digital voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, each voltage dividing resistor is connected to an operational amplifier, and the operational amplifier is configured to collect a voltage difference formed by the voltage dividing resistor.

[0060] In some examples, as shown in FIG. 1a, the analog voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, each voltage dividing resistor is connected to an operational amplifier, and the operational amplifier is configured to collect a voltage difference formed by the voltage dividing resistor. Figure 3As shown in FIG. 1b, the analog voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, and the two ends of the voltage dividing resistors other than the two voltage dividing resistors directly connected to the input end are connected to the first selection switch, and the output end of the first selection switch is connected to the operational amplifier, wherein one end of the voltage dividing resistor directly connected to the input end for accessing the voltage output by the target object is connected to the operational amplifier, and the other end is connected to the first selection switch.

[0061] In some examples, as shown in FIG. 1c, Figure 4 As shown in FIG. 1b, the digital voltage sampling circuit includes a plurality of series-connected voltage dividing resistors, the plurality of voltage dividing resistors have different resistance values, and each voltage dividing resistor of the digital voltage sampling circuit is further connected in parallel with a capacitor module to maintain the direct current component of the signal at a stable level to avoid signal drift and distortion. The two ends of the voltage dividing resistors other than the two voltage dividing resistors directly connected to the input end are connected to the second selection switch, and the output end of the second selection switch is connected to the operational amplifier, wherein one end of the voltage dividing resistor directly connected to the input end for accessing the voltage output by the target object is connected to the operational amplifier, and the other end is connected to the second selection switch.

[0062] Further, as shown in FIG. 1c, Figure 3 b, Figure 4 As shown in FIG. 1b, the first selection switch and the second selection switch can be a multiplexer MUX, which can select one input signal from a plurality of input signals and output the selected input signal to a single output end. In addition, it is also not excluded that the selection switch is realized by other means, for example, a plurality of groups of switches are provided to select one input signal from a plurality of input signals, so that the controller can control the selection switch to select the voltage across one voltage dividing resistor to be output to the operational amplifier to determine the size of the to-be-measured signal.

[0063] The plurality of voltage dividing resistors have different resistance values, and the input to-be-measured voltage signal is divided by the plurality of voltage dividing resistors, and the voltage differences formed by the voltage dividing resistors are different. When the to-be-measured voltage signal is small, the voltage difference obtained by the voltage dividing resistor with a larger resistance value can be relatively large and can be more accurately measured, and the output signal of the operational amplifier connected to the voltage dividing resistor with a larger resistance value can be selected to determine the size of the to-be-measured voltage signal. When the to-be-measured voltage signal is large, the voltage difference formed by the voltage dividing resistor with a smaller resistance value can avoid exceeding the range of the operational amplifier to cause non-linear problems, and the output signal of the operational amplifier connected to the voltage dividing resistor with a smaller resistance value can be selected to determine the size of the to-be-measured voltage signal.

[0064] In some examples, as shown in FIG. 1c, Figure 5As shown, the analog current sampling circuit includes a plurality of series-connected sampling resistors, the plurality of sampling resistors have different resistance values, each sampling resistor is connected with an operational amplifier, and the operational amplifier is used to collect the voltage difference formed by the sampling resistor. The plurality of operational amplifiers are connected to the third gear switch selector, the third gear switch selector is connected to the rear-end conversion circuit, and the third gear switch selector is used to send the output signal of one of the plurality of operational amplifiers to the rear-end conversion circuit.

[0065] In some examples, as shown, Figure 5 The digital current sampling circuit includes a plurality of series-connected sampling resistors, the plurality of sampling resistors have different resistance values, each sampling resistor is connected with an operational amplifier, and the operational amplifier is used to collect the voltage difference formed by the sampling resistor. The plurality of operational amplifiers are connected to the fourth gear switch selector, the fourth gear switch selector is connected to the rear-end conversion circuit, and the fourth gear switch selector is used to send the output signal of one of the plurality of operational amplifiers to the rear-end conversion circuit.

[0066] Further, in the analog current sampling circuit and the digital current sampling circuit, the plurality of sampling resistors are connected in series, the plurality of sampling resistors have different resistance values, and each sampling resistor is connected in parallel with a switch, and the sampling resistor can be short-circuited by the switch. The current signal to be measured flows through the sampling resistors, and by controlling the state of each switch, the total resistance value through which the current signal to be measured flows can be changed to adapt to different sizes of the current, thereby realizing multi-range current measurement. For example, when the current is large, the total resistance value is controlled to be small, and when the current is small, the total resistance value is controlled to be large, which can not only avoid burning of the sampling resistors, but also ensure the measurement accuracy. The current signal to be measured flows through all the sampling resistors that are not short-circuited, and when there are a plurality of sampling resistors that are not short-circuited, the operational amplifiers of these sampling resistors will all collect a voltage difference. The control module can calculate the current size of the current signal to be measured according to the voltage difference formed by the sampling resistor with the largest resistance value in the plurality of sampling resistors that are not short-circuited and the resistance value of the sampling resistor, because when the same current flows, the larger the resistance value of the resistor, the greater the voltage drop generated by the resistor, and therefore the higher the accuracy of the measured current signal.

[0067] The on-off of the switch connected in parallel with the sampling resistor can be controlled by the control module, that is, when the control module detects that the size of the current to be measured reaches a certain set range, the switches of the sampling resistors with different resistance values are controlled.

[0068] Moreover, the on-off of the switches of the sampling resistors is not limited to be realized by hardware circuit, for example, the output end of the operational amplifier of each sampling resistor is connected to a gear shifting circuit, the gear shifting circuit comprises a plurality of comparator circuits, the comparator circuits can compare the voltage difference output by the operational amplifier with a reference voltage, the comparison results of each comparator circuit are input to a flip-flop circuit, the flip-flop circuit comprises a plurality of flip-flops, each flip-flop is connected to a switch, and the flip-flop circuit outputs a trigger signal for controlling the on-off of each switch. The switch is controlled by hardware, which can ensure the switching speed of the switch and can respond in time when the current signal to be measured suddenly changes, thereby avoiding damage to the circuit.

[0069] In the analog current sampling circuit, the gear shifting circuit can be connected to the third gear switch selector, and in the digital current sampling circuit, the gear shifting circuit can be connected to the fourth gear switch selector. The trigger signal output by the gear shifting circuit for controlling the on-off of each switch is also input to the gear switch selector, and the gear switch selector selects an output signal of an operational amplifier based on the trigger signal for controlling the on-off of each switch and inputs the output signal to the rear-end conversion circuit.

[0070] In some examples, as shown in Figure 6 the analog voltage A / D conversion unit comprises a filter module and an A / D converter. The voltage signal output by the front-end sampling circuit is filtered by the filter module and then sent to the A / D converter, so that the high-frequency noise in the voltage signal can be suppressed. The A / D converter converts the analog signal into a digital signal and then sends the digital signal to the control module, so that the voltage signal output by the front-end sampling circuit is converted into a signal that can be directly input to the control module. In addition, the analog voltage A / D conversion unit further comprises an isolation module arranged between the A / D converter and the control module. The isolation module can provide electrical isolation to prevent the control module from being damaged and can also prevent electrical noise and interference.

[0071] In some examples, as shown in Figure 6 the analog current A / D conversion unit comprises a filter module and an A / D converter. The voltage signal output by the front-end sampling circuit is filtered by the filter module and then sent to the A / D converter, so that the high-frequency noise in the voltage signal can be suppressed. The A / D converter converts the analog signal into a digital signal and then sends the digital signal to the control module, so that the voltage signal output by the front-end sampling circuit is converted into a signal that can be directly input to the control module. In addition, the analog voltage A / D conversion unit further comprises an isolation module arranged between the A / D converter and the control module. The isolation module can provide electrical isolation to prevent the control module from being damaged and can also prevent electrical noise and interference.

[0072] The digital voltage signal is a discrete voltage signal, usually having only two discrete values, commonly represented by the numbers 0 and 1, which represent two opposite states, referred to as logic 0 and logic 1, also known as binary digital logic. The digital voltage signal often appears as a sudden voltage change in a circuit, for example, the signal has only two voltage values, such as 5V and 0V, where 5V represents logic 1 and 0V represents logic 0. Therefore, the high and low states of the voltage value can be determined by a simple comparison.

[0073] In some examples, as shown in Figure 7 , the digital voltage threshold voltage comparison unit includes a dual threshold comparator and a voltage dividing module. The dual threshold comparator is used to compare the voltage signal output by the front-end sampling circuit with two set threshold voltages to obtain a comparison result. The output end of the dual threshold comparator is connected to the voltage dividing module, and the output end of the voltage dividing module is connected to the control module. The voltage dividing module can perform voltage division. In addition, the digital voltage threshold voltage comparison unit also includes an isolation module, which is arranged between the voltage dividing module and the control module, and can provide electrical isolation to prevent the control module from being damaged, and can also prevent electrical noise and interference.

[0074] In some examples, as shown in Figure 7 , the digital current threshold voltage comparison unit includes a dual threshold comparator and a voltage dividing module. The dual threshold comparator is used to compare the voltage signal output by the front-end sampling circuit with two set threshold voltages to obtain a comparison result. The output end of the dual threshold comparator is connected to the voltage dividing module, and the output end of the voltage dividing module is connected to the control module. The voltage dividing module can perform voltage division. In addition, the digital current threshold voltage comparison unit also includes an isolation module, which is arranged between the voltage dividing module and the control module, and can provide electrical isolation to prevent the control module from being damaged, and can also prevent electrical noise and interference.

[0075] The digital current signal is a discrete current signal, usually having only two discrete values, commonly represented by the numbers 0 and 1, which represent two opposite states, referred to as logic 0 and logic 1, also known as binary digital logic. The digital current signal often appears as a sudden current change in a circuit, for example, the signal has only two current values, such as 2A and 0A, where 2A represents logic 1 and 0A represents logic 0. Therefore, the high and low states of the current value can be determined by a simple comparison.

[0076] As Figure 8As shown, in the digital voltage threshold voltage comparison unit, the digital current threshold voltage comparison unit, the dual threshold comparator includes two operational amplifiers, the voltage signal output by the front-end sampling circuit is sent to the dual threshold comparator, the voltage signal input to the dual threshold comparator is sent to the inverting input terminal of one operational amplifier A1 and the non-inverting input terminal of another operational amplifier A2 respectively, at the same time, the low threshold voltage UL and the high threshold voltage UH are connected to the non-inverting input terminal of the operational amplifier A1 and the inverting input terminal of the operational amplifier A2 respectively, the output terminals of the two operational amplifiers are the output terminals of the dual threshold comparator, and the comparison result of the voltage signal input to the dual threshold comparator and the set threshold voltage is embodied by the high and low levels of the output signals of the two output terminals.

[0077] The output terminal of the dual threshold comparator is connected to the voltage dividing module, the output terminal of the voltage dividing module is connected to the control module, the voltage dividing module can perform voltage division, since the control module is generally implemented by a chip, it usually has specific input level range requirements, the high and low level signals output by the dual threshold comparator may not meet the input level specifications of the control module, the voltage dividing module can adjust the level output by the dual threshold comparator to the range that can be normally received by the control module through reasonable resistance division ratio, thereby protecting the control module, in addition, since the voltage dividing module divides the noise and the signal together, it reduces the proportion of the noise to a certain extent, improves the signal quality, and reduces the influence of the noise. The control module receives the output signals of the two output terminals of the dual threshold comparator from the voltage dividing module, thereby determining whether the voltage signal input to the dual threshold comparator is a low level or a high level in the digital voltage signal.

[0078] The principle of determining whether the level Ui input to the threshold comparator is a high level or a low level based on the dual threshold comparator is as follows: UL and UH are used as threshold voltages, when Ui < UL < UH, the operational amplifier A1 outputs a high level and the operational amplifier A2 outputs a low level, at this time, the to-be-measured signal is a low level signal in the digital signal, and the control module determines that the logic is 0; when UL < Ui < UH, the operational amplifier A1 outputs a low level and the operational amplifier A2 outputs a low level, at this time, the to-be-measured signal is between a low level and a high level in the digital signal, and the control module determines that the logic state is the same as the logic state at the previous moment; when UL < UH < Ui, the operational amplifier A1 outputs a low level and the operational amplifier A2 outputs a high level, at this time, the to-be-measured signal is a high level signal in the digital signal, and the control module determines that the logic is 1. Further, the low threshold voltage UL and the high threshold voltage UH can be realized by a digital-to-analog converter, which is a DAC chip, capable of outputting constant voltage as the low threshold voltage and the high threshold voltage, and the DAC chip can be controlled by the control module.

[0079] In one example, the working states of the signal collection channel include an analog voltage collection state and a digital voltage collection state, as shown in Figure 9 As shown, the front-end sampling circuit includes a voltage sampling circuit, and the back-end conversion circuit includes a first analog-to-digital conversion unit and a first threshold voltage comparison unit; the voltage sampling circuit is configured to receive a voltage signal through the input end of the signal collection channel and obtain a first voltage signal, and then send the first voltage signal to the first analog-to-digital conversion unit and / or the first threshold voltage comparison unit; the first analog-to-digital conversion unit is configured to receive the first voltage signal, convert the first voltage signal to obtain a first digital signal, and then send the first digital signal to the control module; and the first threshold voltage comparison unit is configured to receive the first voltage signal, compare the first voltage signal with a threshold voltage to obtain a first comparison result, and then send the first comparison result to the control module.

[0080] The structure and principle of the voltage sampling circuit are consistent with those of the digital voltage sampling circuit described above, and the voltage sampling circuit can receive both digital voltage signals and analog voltage signals, and the voltage sampling circuit collects the voltage difference formed by the voltage dividing resistor and sends it to the back-end conversion circuit, that is, the analog voltage sampling circuit can reuse the digital voltage sampling circuit, and the space occupation of the signal collection channel is reduced through circuit device reuse. The structure and principle of the first analog-to-digital conversion unit are consistent with those of the analog voltage analog-to-digital conversion unit described above, and the structure and principle of the first threshold voltage comparison unit are consistent with those of the digital voltage threshold unit in Embodiment 1.

[0081] In some examples, as shown in Figure 9 As shown in (a), the voltage sampling circuit is connected to a third selection switch, and the on-off state of the third selection switch can connect the voltage sampling circuit to the first analog-to-digital conversion unit or the first threshold voltage comparison unit. Thus, the control module can control the state switching of the third selection switch, and connect the voltage sampling circuit to the first analog-to-digital conversion unit or the first threshold voltage comparison unit when the signal collection channel is configured in different working states. The third selection switch can be a multiplexer MUX, which can select one input signal from multiple input signals and output it to a single output end. In addition, it is also not excluded that the third selection switch is realized by other means, for example, 2 groups of switches are arranged to select one input signal from 2 input signals.

[0082] In some examples, as shown in Figure 9(b) as shown, the voltage sampling circuit is connected to the first analog-digital conversion unit and the first threshold voltage comparison unit at the same time, no matter the working state of the signal collection channel is the analog voltage collection state or the digital voltage collection state, the first analog-digital conversion unit and the first threshold voltage comparison unit will output the signal value to the control module, and the control module determines the size of the voltage signal to be measured based on the output signal of the first analog-digital conversion unit or the first threshold voltage comparison unit according to the current working state of the signal collection channel, for example, the current working state is the analog voltage collection state, then the signal output from the first threshold voltage comparison unit to the control module is ignored, which can reduce the use of circuit elements and reduce the cost.

[0083] In one example, the working state of the signal collection channel includes an analog current collection state and a digital current collection state, as shown in Figure 10 As shown, the signal collection channel includes a front-end sampling circuit and a back-end conversion circuit, the front-end sampling circuit includes a current sampling circuit, and the back-end conversion circuit includes a second analog-digital conversion unit and a second threshold voltage comparison unit; the current sampling circuit is used to receive the current signal through the input end of the signal collection channel and obtain the second voltage signal and send it to the second analog-digital conversion unit and / or the second threshold voltage comparison unit; the second analog-digital conversion unit is used to receive the second voltage signal and convert the second voltage signal to obtain the second digital signal and send it to the control module; the second threshold voltage comparison unit is used to receive the second voltage signal and compare the second voltage signal with the threshold voltage to obtain the second comparison result and send it to the control module.

[0084] Among them, the structure and principle of the current sampling circuit are consistent with the above-mentioned analog current sampling circuit and digital current sampling circuit, that is, it can receive analog current signals and digital current signals, and the operational amplifier collects the voltage difference formed by the sampling resistor and sends it to the back-end conversion circuit, that is, the analog current sampling circuit can be reused for the digital current sampling circuit, and through the reuse of circuit devices, the space occupation of the signal collection channel is reduced. The structure and principle of the second analog-digital conversion unit are consistent with the above-mentioned analog current analog-digital conversion unit, and the structure and principle of the second threshold voltage comparison unit are consistent with the above-mentioned digital current threshold unit.

[0085] In some examples, as shown in Figure 10(a) as shown, the current sampling circuit is connected to the fourth selection switch, and the on-off state of the fourth selection switch can switch the current sampling circuit to be connected to the second analog-digital conversion unit or the second threshold voltage comparison unit. Thus, the control module can control the state switching of the fourth selection switch, and connect the current sampling circuit to the second analog-digital conversion unit or the second threshold voltage comparison unit when the signal acquisition channel is configured to be in different working states. The fourth selection switch can be a multiplexer MUX, which can select an input signal from multiple input signals and output it to a single output terminal. In addition, it is also not excluded that the fourth selection switch is realized by other means, for example, 2 groups of switches are arranged to select an input signal from 2 input signals.

[0086] In some examples, as shown in Figure 10 (b) as shown, the current sampling circuit is connected to the second analog-digital conversion unit and the second threshold voltage comparison unit at the same time. No matter whether the working state of the signal acquisition channel is the analog current acquisition state or the digital current acquisition state, the second analog-digital conversion unit and the second threshold voltage comparison unit will output signal values to the control module. The control module determines the size of the current signal to be measured based on the output signal of the second analog-digital conversion unit or the second threshold voltage comparison unit according to the working state of the current signal acquisition channel. For example, if the current working state is the analog current acquisition state, the signal output from the second threshold voltage comparison unit to the control module is ignored. In this way, the use of circuit elements can be reduced, and the cost can be reduced.

[0087] In one example, the working state of the signal acquisition channel includes at least one of an analog voltage acquisition state and a digital voltage acquisition state, at least one of an analog current acquisition state and a digital current acquisition state, the signal acquisition channel includes a front-end sampling circuit and a back-end conversion circuit, the front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit, and the back-end conversion circuit includes at least one of a first analog-digital conversion unit and a first threshold voltage comparison unit, and at least one of a second analog-digital conversion unit and a second threshold voltage comparison unit; the voltage sampling circuit is configured to receive a voltage signal through an input end of the signal acquisition channel, obtain a first voltage signal, and send the first voltage signal to the first analog-digital conversion unit and / or the first threshold voltage comparison unit; the current sampling circuit is configured to receive a current signal through the input end of the signal acquisition channel, obtain a second voltage signal, and send the second voltage signal to the second analog-digital conversion unit and / or the second threshold voltage comparison unit; the first analog-digital conversion unit is configured to receive the first voltage signal, convert the first voltage signal to obtain a first digital signal, and send the first digital signal to the control module; the second analog-digital conversion unit is configured to receive the second voltage signal, convert the second voltage signal to obtain a second digital signal, and send the second digital signal to the control module; the first threshold voltage comparison unit is configured to receive the first voltage signal, compare the first voltage signal with a threshold voltage, obtain a first comparison result, and send the first comparison result to the control module; and the second threshold voltage comparison unit is configured to receive the second voltage signal, compare the second voltage signal with the threshold voltage, obtain a second comparison result, and send the second comparison result to the control module.

[0088] In some examples, the working state of the signal acquisition channel includes an analog voltage acquisition state and an analog current acquisition state, the front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit, and the back-end conversion circuit includes a first analog-digital conversion unit and a second analog-digital conversion unit. In some examples, the working state of the signal acquisition channel includes an analog voltage acquisition state, a digital voltage acquisition state, and an analog current acquisition state, the front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit, and the back-end conversion circuit includes a first analog-digital conversion unit, a second analog-digital conversion unit, and a first threshold voltage comparison unit. In some examples, the working state of the signal acquisition channel includes an analog voltage acquisition state, an analog current acquisition state, and a digital current acquisition state, the front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit, and the back-end conversion circuit includes a first analog-digital conversion unit, a second analog-digital conversion unit, and a second threshold voltage comparison unit.

[0089] In some examples, the signal acquisition channel operates in three states: digital voltage acquisition, digital current acquisition, and analog voltage acquisition. The front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit. The back-end conversion circuit includes a first threshold voltage comparison unit and a second threshold voltage comparison unit. In other examples, the signal acquisition channel operates in three states: analog voltage acquisition, digital voltage acquisition, and digital current acquisition. The front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit. The back-end conversion circuit includes a first analog-to-digital converter, a first threshold voltage comparison unit, and a second threshold voltage comparison unit. In yet another example, the signal acquisition channel operates in three states: digital voltage acquisition, analog current acquisition, and digital current acquisition. The front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit. The back-end conversion circuit includes a second analog-to-digital converter, a first threshold voltage comparison unit, and a second threshold voltage comparison unit.

[0090] In some examples, the signal acquisition channel operates in analog voltage acquisition mode, digital voltage acquisition mode, analog current acquisition mode, and digital current acquisition mode. The front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit. The back-end conversion circuit includes a first analog-to-digital conversion unit, a second analog-to-digital conversion unit, a first threshold voltage comparison unit, and a second threshold voltage comparison unit.

[0091] In a further example, when the signal acquisition channel operates in both analog and digital voltage acquisition states, the two states share the same voltage sampling circuit.

[0092] In a further example, when the signal acquisition channel operates in both analog and digital current acquisition states, the two states share a single current sampling circuit.

[0093] In a further example, when the signal acquisition channel operates in both analog voltage acquisition and analog current acquisition states, such as... Figure 11 As shown, the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are implemented by the same set of analog-to-digital conversion units. The analog-to-digital conversion units are connected to the fifth selection switch. The on / off state switching of the fifth selection switch can connect the analog-to-digital conversion units to the current sampling circuit or the voltage sampling circuit. Thus, the control module can control the state switching of the fifth selection switch and connect the analog-to-digital conversion units to the voltage sampling circuit or the current sampling circuit respectively when the signal acquisition channel is configured to different working states.

[0094] In a further example, when the signal acquisition channel operates in both analog voltage acquisition and analog current acquisition states, such as... Figure 12As shown, the analog-to-digital converter in the second analog-to-digital conversion unit and the isolation module can be multiplexed with the analog-to-digital converter in the first analog-to-digital conversion unit and the isolation module, wherein the analog-to-digital converter in the first analog-to-digital conversion unit is implemented by a dual-channel ADC chip, one channel of the dual-channel ADC chip is connected to the voltage sampling circuit, and one channel is connected to the current sampling circuit. At this time, regardless of whether the working state of the signal acquisition channel is the analog voltage acquisition state or the analog current acquisition state, the voltage sampling circuit and the current sampling circuit will output signal values to the dual-channel ADC chip, the control module receives two output signals of the dual-channel ADC chip, and determines the size of the to-be-measured voltage signal or the to-be-measured current signal based on the output signal of one channel according to the working state of the current signal acquisition channel.

[0095] Further examples, when the working state of the signal acquisition channel simultaneously includes the digital voltage acquisition state and the digital current acquisition state, as shown in Figure 11 , Figure 12 As shown, the first threshold voltage comparison unit and the second threshold voltage comparison unit are implemented by the same set of threshold voltage comparison units, and the threshold voltage comparison units are connected to the sixth selection switch. The on-off state switching of the sixth selection switch can connect the threshold voltage comparison units to the current sampling circuit or the voltage sampling circuit. Therefore, the control module can control the state switching of the sixth selection switch to connect the threshold voltage comparison units to the voltage sampling circuit or the current sampling circuit when the signal acquisition channel is configured in different working states.

[0096] In one example, when the signal acquisition channel is configured in any working state, the two input terminals are connected to the target object and receive the input signal. The protection circuit is provided between the two input terminals receiving the input signal. The protection circuit includes a diode provided between the two input terminals in the voltage acquisition state, and a fuse provided between the two input terminals in the current acquisition state. As shown in Figure 13 As shown, the analog voltage acquisition state and the digital voltage acquisition state share the same two input terminals DUT, DUT ref, and the diode is connected between the two input terminals, which plays a role in overvoltage protection; the analog current acquisition state and the digital current acquisition state share the same two input terminals DUT, load, and the fuse is provided between the two input terminals, which plays a role in overcurrent protection circuit. In addition, the input terminal DUT for connecting the target object in the voltage acquisition state and the current acquisition state is also provided with a protection switch K1, which can be disconnected when the voltage is too large and the current is too large, so as to protect the internal circuit of the signal acquisition device.

[0097] In one example, the signal acquisition channel is configured to connect the target object and receive the input signal through the two input terminals in any working state, one of the two input terminals receiving the input signal is further connected to the fault injection module, and the fault injection module includes an enable switch connected to the input terminal DUT for connecting the target object in the voltage acquisition state and the current acquisition state, the enable switch is connected to the electronic switch, and the electronic switch is connected to the GND terminal and the VBAT terminal in different states respectively. As shown in Figure 13 the signal acquisition channel supports fault injection, the input terminal DUT for connecting the target object is connected to the enable switch K2 in the voltage acquisition state and the current acquisition state, and the on-off of the enable switch K2 can control whether to perform fault injection. When fault injection is performed, K2 is turned on, and the GND terminal and the VBAT terminal are connected to the ground and the power supply respectively, for example, the ground and the power supply of the measured object. When the electronic switch is connected to the GND terminal, a short circuit to ground fault can be simulated, and when the electronic switch is connected to the VBAT terminal, a short circuit to power fault can be simulated. Further, the electronic switch is an electronic switch with overcurrent detection, which can prevent excessive current and protect the signal acquisition device.

[0098] In one example, the control module is connected to a storage module, which can be used to store the model, SN number, version number of the signal acquisition device, and the firmware and configuration information of the control device. Further, the storage module can also store some preset signal acquisition channel configuration information for indicating the working state of each signal acquisition channel, for example, all signal acquisition channels are set to analog voltage acquisition state, or all signal acquisition channels are set to digital current acquisition state. In this way, the preset signal acquisition channel configuration information can be used to reduce the amount of user operation.

[0099] The control module can be implemented by any circuit module with data processing capability. In one example, the control module includes an FPGA module, and the FPGA module is connected to the storage module and loads the firmware from the storage module after power-on. In one example, the control module includes an FPGA module and a microcontroller, and the microcontroller is connected to the storage module and loads the firmware from the storage module and loads the firmware for the FPGA module after power-on.

[0100] In some examples, the control module is further connected to a debugging interface for debugging the control module. The debugging interface can include any one or more of the following: UART interface, USB interface, traditional Ethernet interface, etc.

[0101] In one example, the control module is further connected with a communication interface, and the communication interface is configured to connect with an external device to transmit data between the control module and the external device. Thus, the signal acquisition device can send the values of the to-be-measured signals of the target object acquired by the signal acquisition channels to the external device, and the external device can communicate with the signal acquisition device to send control commands to the signal acquisition device, such as controlling the switching of the working state of the signal acquisition channels, acquiring the current working state of each signal acquisition channel in the signal acquisition device, reading the model, SN number, version number, and other information of the signal acquisition device, and performing firmware upgrade on the signal acquisition device.

[0102] In one example, the control module is further connected with a communication interface, and the communication interface is configured to connect with an external device to transmit data between the control module and the external device. Thus, the signal acquisition device can send the values of the to-be-measured signals of the target object acquired by the signal acquisition channels to the external device, and the external device can communicate with the signal acquisition device to send control commands to the signal acquisition device, such as controlling the switching of the working state of the signal acquisition channels, acquiring the current working state of each signal acquisition channel in the signal acquisition device, reading the model, SN number, version number, and other information of the signal acquisition device, and performing firmware upgrade on the signal acquisition device.

[0103] In some examples, the control module is connected with multiple communication interfaces, including an EtherCAT communication interface, an IIC communication interface, an EtherNet communication interface (a traditional Ethernet interface), and a PCIE communication interface. The control module can select any of the above signal lines to establish a communication path with the external device at any time.

[0104] In some examples, the control module further includes a wireless communication module, such as a WiFi module, a 4G / 5G communication module, a Bluetooth module, a ZigBee module, etc. Thus, the external device can be wirelessly connected with the signal acquisition device to remotely use the signal acquisition device, and the signal acquisition device is remotely controlled by the user.

[0105] In some examples, the external device can be a host connected with the signal acquisition device, or a computer, a server, a tablet, a mobile phone, or other information terminals. Further, the external device can have a display screen or be connected with a display screen to display the working state of each signal acquisition channel of the signal acquisition device, the values of the to-be-measured signals acquired by each signal acquisition channel, etc. In addition, the external device can be connected with a mouse, a keyboard, a touch screen, or other input devices, and the user can input control commands to the signal acquisition device through these input devices, such as controlling the switching of the working state of the signal acquisition channels.

[0106] In one example, the signal acquisition device further comprises a power module, wherein the power module is configured to convert the power supply voltage provided by the power supply into a voltage for powering the components of the signal acquisition device. For example, the power supply voltage provided by the power supply is converted into a voltage of 3V, 5V, etc. for powering the signal acquisition device.

[0107] The embodiments of the present application also provide a system comprising a host and a signal interaction device, wherein the signal interaction device is configured to be connected between the host and a target object, one type of the signal interaction device is a signal acquisition device, and the control module is configured to acquire the output signal of the target object from the signal acquisition channel and send the output signal to the host.

[0108] In one example, the system comprises a plurality of signal acquisition devices, and more signal acquisition channels can be provided to meet the data acquisition requirements of the host for the target object.

[0109] In one example, a plurality of communication connection parts are provided on one signal interaction device, and different types of signal interaction devices are different in the types and / or quantities of the communication connection parts. The communication connection part is configured to be connected to a communication medium connected to the target object.

[0110] In one example, the signal interaction device comprises at least one upper interface for connecting the host and a plurality of communication connection parts, wherein the signal type transmitted by the upper interface is any one of the following: PCIE signal, USB signal, traditional Ethernet signal, EtherNet signal, IIC signal, SPI signal, GPIO signal, etc. One type of the communication connection part is configured to transmit one type of signal, wherein the signal type transmitted by one communication connection part is any one of the following: CAN bus signal, LIN bus signal, FlexRay bus signal, vehicle-mounted Ethernet bus signal, SENT bus signal, DSI bus signal, PSI bus signal, K-Line bus signal, analog voltage output signal, digital voltage output signal, analog voltage input signal, digital voltage input signal, analog voltage output signal, digital voltage output signal, analog voltage input signal, and digital voltage input signal. For example, the DSI bus signal is DSI3 bus signal, and the PSI bus signal is PSI5 bus signal.

[0111] The signal interaction device can convert the signal received by the upper interface into a signal type and then transmit the signal through one communication connection part, and / or convert the signal received by the communication connection part into a signal type and then transmit the signal through one upper interface. For example, the signal interaction device is a CAN bus board, which is provided with a USB interface and a CAN bus interface, the USB interface is configured to be connected to the host, and the CAN bus interface is configured to receive and transmit CAN bus signals.

[0112] In one example, the communication medium is a signal line for transmitting a signal, and different types of communication medium differ in the type of signal supported for transmission. In general, communication medium is divided into bus signal lines and unidirectional transmission signal lines. One type of bus signal line supports one type of bus signal, and the bus signal supported by one bus signal line is any one of the following: CAN bus signal, LIN bus signal, FlexRay bus signal, vehicle-mounted Ethernet bus signal, SENT bus signal, DSI bus signal, PSI bus signal, K-Line bus signal. One type of unidirectional transmission signal line supports one type of unidirectional transmission signal, and the unidirectional transmission signal supported by one unidirectional transmission signal line is any one of the following: analog voltage output signal, digital voltage output signal, analog voltage input signal, digital voltage input signal, analog voltage output signal, digital voltage output signal, analog voltage input signal, digital voltage input signal. In addition, the communication medium can also include interfaces or terminals on the target object for connecting bus signal lines and unidirectional transmission signal lines, and can also include connectors and the like provided for connecting bus signal lines and unidirectional transmission signal lines to the target object.

[0113] One target object is connected to at least one type of communication medium, and the number of each type of communication medium connected to the target object is one or more. For example, the target object is an ECU, which is connected to one CAN bus and two analog voltage input signal lines.

[0114] In one example, the system further includes a signal distribution module and a plurality of universal connection portions, the plurality of first connection portions of the signal distribution module are respectively connected to different communication connection portions; the host communicates with the target object through the communication connection portions, the universal connection portions, and the communication medium connected to the target object; the universal connection portions are configured to be able to connect communication media of different signal types at different time periods; and the universal connection portions are used to transmit signals between communication media of the same signal type and the communication connection portions; the plurality of second connection portions of the signal distribution module are respectively connected to different universal connection portions, or: the plurality of second connection portions of the signal distribution module are respectively used as different universal connection portions; the signal distribution module is configured to selectively connect the first connection portions and the second connection portions. Further, the signal distribution module is also connected to the host, and the host is used to control the state of each switching element.

[0115] In some examples, the signal distribution module includes a first switching matrix, the first switching matrix includes a plurality of switching elements, each first connection portion is connected to each second connection portion through a switching element, and the switching element is configured to be switchable between a conductive state and a disconnected state to selectively connect the first connection portion and the second connection portion. The signal distribution module further includes a processing module for controlling the state of each switching element.

[0116] In one example, at least two of the plurality of universal connection portions are of different types, and the different types of universal connection portions differ in that they support different communication media for connection, wherein one type of universal connection portion supports connection of at least two types of communication media for connection of signals. For example, one type of universal connection portion supports connection of a CAN bus and a LIN bus, one type of universal connection portion supports connection of a CAN bus, a LIN bus, and a FlexRay bus, one type of universal connection portion supports connection of an analog voltage input signal line and a digital voltage input signal line, and one type of universal connection portion supports connection of an analog current output signal line and an analog voltage output signal line.

[0117] In some examples, the universal connection portion has two signal terminals, and most types of signals are transmitted through two signal lines. Therefore, the universal connection portion can be connected to different types of communication media, such as the CAN_H line and the CAN_L line of a CAN bus and the input line and the ground line of an analog current input signal line. The universal connection portion is used to transmit signals between the same type of communication media and a communication connection portion, and does not itself involve processing, modulation and demodulation, serial-to-parallel conversion, protocol conversion, and other operations on signals, but transmits signals between the communication media and the communication connection portion.

[0118] In some examples, the universal connection portion has one signal terminal, one communication medium can be connected to two universal connection portions, and the two universal connection portions can transmit signals between the connected communication medium and a communication connection portion. This can further decouple the connection portions to adapt to different application requirements, and can ensure the safety and reliability of electrical connections for some special communication media, such as a PSI bus. In a further example, the system further includes a GND connection portion, one communication medium can be connected to one universal connection portion and one GND connection portion, and the GND connection portion is a universal connection portion for connecting a ground line in the communication medium.

[0119] In the technical solution of the present application, the universal connection portion can be compatible with different types of communication media for connection. When connecting the target object to the system, it is not necessary to connect according to the signal type of the communication medium connected to the target object, but only to connect the communication medium connected to the target object to the universal connection portion. This makes the wiring operation more time-saving and labor-saving.

[0120] In particular, when establishing the connection between the target object and the signal collection device, the signal collection channel is connected to the communication medium through the signal distribution module. On the one hand, the working state of the signal collection channel can be configured to match the communication medium of the target object, for example, if the communication medium of the target object outputs an analog current signal, the working state of the connected signal collection channel is configured to an analog current collection state. On the other hand, the signal communication medium of the target object can be switched to the matched signal collection channel through the switch matrix module, for example, if the signal communication medium of the target object outputs a digital voltage signal, a signal collection channel with a working state of digital voltage collection state is found, and the signal communication medium is connected to the signal collection channel through the switch matrix. Thus, the working state of the signal collection channel can be switched, and the signal communication medium connected to the signal collection channel can also be switched, providing a more flexible and variable connection method, which is more convenient for users to use.

[0121] In one example, the host and the signal interaction device are connected through the EtherCAT signal line, wherein the host is the master station in the EtherCAT communication network, and the signal interaction device is the slave station in the EtherCAT communication network. The signal interaction device includes the signal collection device and / or the signal interaction device.

[0122] In one example, the system further includes a backboard, and the host and the signal interaction device are respectively provided with connectors for connecting to the connectors on the backboard, as shown in Figure 14 The connectors on the backboard are arranged with signal lines, and the host and the signal interaction device are respectively connected to the signal lines through the connectors and the connectors. The signal interaction device includes the signal collection device and / or the signal interaction device.

[0123] The connectors on the backboard include first connectors for connecting the host and second connectors for connecting the signal interaction device, wherein the first connectors are connected to each second connector through PCIE signal lines, IIC signal lines and EtherNet signal lines, so that the signal interaction device connected to any second connector can communicate with the host through the signal lines, thereby the signal interaction device can realize communication with the host.

[0124] In addition, the first connector and each second connector are also connected together through an EtherCAT signal line, for example, the first connector and the plurality of second connectors are sequentially cascaded. Meanwhile, considering that the feature of EtherCAT communication is message transmission by stages, this limits that the signal interaction device must be sequentially connected with the second connector, that is, there cannot be an idle second connector between two non-idle second connectors, leading to inconvenience in use. In order to overcome this problem, each second connector is provided with a switch in the application, the switch is used to short-circuit the second connector, so that when the second connector is not connected with the signal interaction device, the idle second connector can be short-circuited through the switch, so that the connectors between the upstream and downstream of the idle second connector can be conducted, and the EtherCAT communication demand can be met.

[0125] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0126] The signal acquisition device and system provided by the embodiments of the application are described in detail above, and the principles and implementation manners of the application are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation manner and application range will be changed, and in view of the above, the content of the specification should not be understood as a limitation of the application.

Claims

1. A signal acquisition device for data acquisition or testing, characterized in that, The control module is connected with the signal acquisition channel. The signal acquisition channel is used for connecting a target object, and the target object includes any one or more of the following: an electronic device installed on a vehicle, a measured object, and an auxiliary device used for assisting the measured object in testing. The working state of the signal acquisition channel includes at least two of an analog voltage acquisition state, a digital voltage acquisition state, an analog current acquisition state, and a digital current acquisition state. The signal acquisition channel includes multiple input terminals, and the signal acquisition channel is configured to connect the target object through two input terminals in any working state.

2. The signal acquisition device of claim 1, wherein, The working state of the signal acquisition channel includes an analog voltage acquisition state and a digital voltage acquisition state, the signal acquisition channel includes a front-end sampling circuit and a rear-end conversion circuit, the front-end sampling circuit includes a voltage sampling circuit, and the rear-end conversion circuit includes a first analog-digital conversion unit and a first threshold voltage comparison unit. The voltage sampling circuit is used for receiving a voltage signal through the input terminal of the signal acquisition channel, obtaining a first voltage signal, and sending the first voltage signal to the first analog-digital conversion unit and / or the first threshold voltage comparison unit. The first analog-digital conversion unit is used for receiving the first voltage signal, converting the first voltage signal to obtain a first digital signal, and sending the first digital signal to the control module. The first threshold voltage comparison unit is used for receiving the first voltage signal, comparing the first voltage signal with a threshold voltage to obtain a first comparison result, and sending the first comparison result to the control module.

3. The signal acquisition device of claim 1, wherein, The working state of the signal acquisition channel includes an analog current acquisition state and a digital current acquisition state, the signal acquisition channel includes a front-end sampling circuit and a rear-end conversion circuit, the front-end sampling circuit includes a current sampling circuit, and the rear-end conversion circuit includes a second analog-digital conversion unit and a second threshold voltage comparison unit. The current sampling circuit is used for receiving a current signal through the input terminal of the signal acquisition channel, obtaining a second voltage signal, and sending the second voltage signal to the second analog-digital conversion unit and / or the second threshold voltage comparison unit. The second analog-digital conversion unit is used for receiving the second voltage signal, converting the second voltage signal to obtain a second digital signal, and sending the second digital signal to the control module. The second threshold voltage comparison unit is used for receiving the second voltage signal, comparing the second voltage signal with a threshold voltage to obtain a second comparison result, and sending the second comparison result to the control module.

4. The signal acquisition device of claim 1, wherein, The working state of the signal acquisition channel includes at least one of an analog voltage acquisition state and a digital voltage acquisition state, and at least one of an analog current acquisition state and a digital current acquisition state, the signal acquisition channel includes a front-end sampling circuit and a rear-end conversion circuit, the front-end sampling circuit includes a voltage sampling circuit and a current sampling circuit, and the rear-end conversion circuit includes at least one of a first analog-digital conversion unit and a first threshold voltage comparison unit, and at least one of a second analog-digital conversion unit and a second threshold voltage comparison unit. The voltage sampling circuit is configured to receive a voltage signal through an input end of a signal acquisition channel and obtain a first voltage signal, and then send the first voltage signal to a first analog-digital conversion unit and / or a first threshold voltage comparison unit. The current sampling circuit is configured to receive a current signal through an input end of the signal acquisition channel and obtain a second voltage signal, and then send the second voltage signal to a second analog-digital conversion unit and / or a second threshold voltage comparison unit. The first analog-digital conversion unit is configured to receive the first voltage signal and convert the first voltage signal to obtain a first digital signal, and then send the first digital signal to the control module. The second analog-digital conversion unit is configured to receive the second voltage signal and convert the second voltage signal to obtain a second digital signal, and then send the second digital signal to the control module. The first threshold voltage comparison unit is configured to receive the first voltage signal and compare the first voltage signal with a threshold voltage to obtain a first comparison result, and then send the first comparison result to the control module. The second threshold voltage comparison unit is configured to receive the second voltage signal and compare the second voltage signal with the threshold voltage to obtain a second comparison result, and then send the second comparison result to the control module.

5. The signal acquisition device of claim 4, wherein, The first analog-digital conversion unit and the second analog-digital conversion unit use the same set of analog-digital conversion units, and the analog-digital conversion units include a filtering module and an analog-digital converter.

6. The signal acquisition device of claim 4, wherein, The first threshold voltage comparison unit and the second threshold voltage comparison unit use the same set of threshold voltage comparison units, and the threshold voltage comparison units include a double-threshold comparator and a voltage dividing module.

7. The signal acquisition device of claim 1, wherein, The signal acquisition channel is configured to connect one of the two input ends of the target object and the fault injection module when in any working state.

8. The signal acquisition device of claim 1, wherein, The control module is further connected to a communication interface, and the communication interface is configured to connect to an external device to transmit data between the control module and the external device.

9. A system for data acquisition or testing, characterized by The system further includes a backboard, and the host and the signal interaction device are respectively provided with connectors, the connectors are configured to be connected to connectors on the backboard, signal lines are arranged between the connectors on the backboard, and the host and the signal interaction device are respectively connected to the signal lines through the connectors and the connectors.

10. The system of claim 9, wherein, The system further includes a backboard, and the host and the signal interaction device are respectively provided with connectors, the connectors are configured to be connected to connectors on the backboard, signal lines are arranged between the connectors on the backboard, and the host and the signal interaction device are respectively connected to the signal lines through the connectors and the connectors.

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