Analog adaptive acquisition device, rail transit signal acquisition system and chip

Abstract

The present application discloses an analog quantity adaptive acquisition device, a rail transit signal acquisition system and a chip, the analog quantity adaptive acquisition device includes a switch controller, a first switch, a second switch, a signal conditioning unit, an AD converter, the first end of the first switch is connected to the first signal input end, the second end of the first switch is connected to the first input end of the signal conditioning unit; the first fixed end of the second switch is connected to the second signal input end, the second fixed end of the second switch is grounded, and the moving end of the second switch is connected to the second input end of the signal conditioning unit; the output end of the signal conditioning unit is connected to the input end of the AD converter; the output end of the AD converter outputs a sampling signal; the switch controller is used to receive the sampling signal and control the switch state of the first switch and the second switch according to the sampling signal. The acquisition device of the present application can meet the sampling requirements of different sampling signals and greatly reduce the device configuration cost of signal acquisition.

Description

Technical Field

[0001] The present invention relates to the field of signal processing, and in particular to an analog quantity adaptive acquisition device, a rail transit signal acquisition system and a chip. Background Art

[0002] In recent years, with the development of urban rail transit, the rail transit safety industry has put forward higher flexible configuration and resource requirements for signal systems, traction control systems, network control systems, braking systems, vehicle logic control systems, power supply systems, etc. Among them, signal acquisition of the signal system is the control premise of all the above systems. The functions of current signal acquisition devices are relatively single and fixed, and it is difficult to flexibly meet the needs of different signal acquisitions. Only multiple signal acquisition devices with different functions can be installed, which greatly increases the cost of the signal system.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an analog adaptive acquisition device, a rail transit signal acquisition system and a chip. The specific scheme is as follows:

[0005] An analog quantity adaptive acquisition device includes a switch controller, a first switch, a second switch, a signal conditioning unit, and an AD converter, wherein:

[0006] The first end of the first switch is connected to the first signal input end, and the second end of the first switch is connected to the first input end of the signal conditioning unit;

[0007] The second switch is a single-pole double-throw switch, a first fixed end of the second switch is connected to the second signal input end, a second fixed end of the second switch is grounded, and a moving end of the second switch is connected to the second input end of the signal conditioning unit;

[0008] The output end of the signal conditioning unit is connected to the input end of the AD converter;

[0009] The output end of the AD converter outputs a sampling signal;

[0010] The switch controller is used to receive the sampling signal and control the switch states of the first switch and the second switch according to the sampling signal.

[0011] Preferably, the switch controller is specifically used for:

[0012] According to the value change trend of the sampling signal, determining whether the sampling signal is a differential signal or a DC signal;

[0013] If the sampling signal is the differential signal, the first switch is controlled to be closed, and the moving end of the second switch is controlled to be connected to the first fixed end;

[0014] If the sampling signal is the DC signal, the first switch is controlled to be closed, and the moving end and the second fixed end of the second switch are controlled to be conductive.

[0015] Preferably, the signal conditioning unit comprises a matching impedance circuit with adjustable impedance, which is used to control the acquisition range and acquisition accuracy of the sampling signal.

[0016] Preferably, the signal conditioning unit comprises a first processing circuit, the matching impedance circuit and a second processing circuit, the matching impedance circuit comprises a third switch and two matching impedance sub-units with different impedances, wherein:

[0017] The first end and the second end of the first processing circuit serve as the first input end and the second input end of the signal conditioning unit respectively; the third switch is a single-pole double-throw switch, the movable end of the third switch is connected to the third end of the first processing circuit, the first fixed end and the second fixed end of the third switch are respectively connected to the first ends of the two matching impedance sub-units, and the second ends of the two matching impedance sub-units are both connected to the first end of the second processing circuit; the second end of the second processing circuit serves as the output end of the signal conditioning unit.

[0018] Preferably, the analog quantity adaptive acquisition device further comprises a self-checking unit for outputting a self-checking signal;

[0019] The first switch is a single-pole double-throw switch, a first fixed end of the first switch is connected to the first signal input end, a second fixed end of the first switch is connected to the output end of the self-test unit, and a moving end of the first switch is connected to the first input end of the signal conditioning unit;

[0020] When the switch controller is in the acquisition mode, the switch controller controls the first fixed end and the moving end of the first switch to be turned on;

[0021] When the switch controller is in the self-test mode, the switch controller controls the second fixed end and the moving end of the first switch to be turned on, and controls the second fixed end and the moving end of the second switch to be turned on.

[0022] Preferably, the switch controller switches the acquisition mode and the self-test mode according to a preset frequency.

[0023] Preferably, the switch controller controls the self-test unit to output the corresponding self-test signal.

[0024] Preferably, the self-test unit comprises:

[0025] a fourth single-pole double-throw switch controlled by the switch controller;

[0026] Two self-test signal sources;

[0027] The first fixed end and the second fixed end of the fourth switch are respectively connected to the output ends of the two self-test signal sources, and the movable end of the fourth switch serves as the output end of the self-test unit.

[0028] Preferably, the analog quantity adaptive acquisition device further comprises an isolation unit, an input end of the isolation unit is connected to an output end of the AD converter, and an output end of the isolation unit outputs the sampling signal to the switch controller.

[0029] Preferably, the switch controller is specifically an MCU or FPGA or CPU.

[0030] Preferably, the analog quantity adaptive acquisition device further comprises:

[0031] A display screen connected to the switch controller.

[0032] Preferably, the analog quantity adaptive acquisition device further comprises:

[0033] A communication unit connected to the switch controller.

[0034] Preferably, the communication unit is specifically a wireless communication unit.

[0035] Correspondingly, the present application also discloses a rail transit signal acquisition system, comprising the analog quantity adaptive acquisition device as described in any one of the above items.

[0036] Correspondingly, the present application also discloses a chip, comprising an integrated circuit of the analog quantity adaptive acquisition device as described in any one of the above items.

[0037] The present application discloses an analog quantity adaptive acquisition device, including a switch controller, a first switch, a second switch, a signal conditioning unit, and an AD converter, wherein: the first end of the first switch is connected to the first signal input end, and the second end of the first switch is connected to the first input end of the signal conditioning unit; the second switch is a single-pole double-throw switch, the first fixed end of the second switch is connected to the second signal input end, the second fixed end of the second switch is grounded, and the movable end of the second switch is connected to the second input end of the signal conditioning unit; the output end of the signal conditioning unit is connected to the input end of the AD converter; the output end of the AD converter outputs a sampling signal; the switch controller is used to receive the sampling signal and control the switch states of the first switch and the second switch according to the sampling signal. The present application uses a switch controller to flexibly control the switch states of the first switch and the second switch according to different sampling signals, thereby ensuring that the entire circuit structure of the first switch, the second switch, the signal conditioning unit and the AD converter can collect correct and accurate sampling signals. The acquisition device can meet the sampling requirements of different sampling signals, has the advantages of strong versatility, wide application range, and flexible configuration, and greatly reduces the device configuration cost of signal acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] Figure 1 This is a structural distribution diagram of an analog quantity adaptive acquisition device in an embodiment of the present invention;

[0040] Figure 2 The structure distribution diagram of a specific analog quantity adaptive acquisition device in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The functions of current signal acquisition devices are relatively single and fixed, and it is difficult to flexibly meet the needs of different signal acquisitions. Only multiple signal acquisition devices with different functions can be installed, which greatly increases the cost of the signal system. The present application uses a switch controller to flexibly control the switch states of the first switch and the second switch according to different sampling signals, thereby ensuring that the entire circuit structure of the first switch, the second switch, the signal conditioning unit and the AD converter can collect correct and accurate sampling signals. The acquisition device can meet the sampling needs of different sampling signals, has the advantages of strong versatility, wide application range and flexible configuration, and greatly reduces the configuration cost of the signal acquisition device.

[0043] The embodiment of the present invention discloses an analog quantity adaptive acquisition device, see Figure 1 As shown, it includes a switch controller 1, a first switch K1, a second switch K2, a signal conditioning unit 2, and an AD converter 3, wherein:

[0044] A first end of the first switch K1 is connected to the first signal input end ip1, and a second end of the first switch K1 is connected to the first input end of the signal conditioning unit 2;

[0045] The second switch K2 is a single-pole double-throw switch, a first fixed end of the second switch K2 is connected to the second signal input end ip2, a second fixed end of the second switch K2 is grounded, and a moving end of the second switch K2 is connected to the second input end of the signal conditioning unit 2;

[0046] The output end of the signal conditioning unit 2 is connected to the input end of the AD converter 3;

[0047] The output terminal of the AD converter 3 outputs a sampling signal;

[0048] The switch controller 1 is used to receive a sampling signal and control the switching states of the first switch K1 and the second switch K2 according to the sampling signal.

[0049] Furthermore, the switch controller 1 is specifically used for:

[0050] According to the numerical variation trend of the sampling signal, it is determined whether the sampling signal is a differential signal or a DC signal;

[0051] If the sampling signal is a differential signal, the first switch K1 is controlled to be closed, and the moving end of the second switch K2 is controlled to be connected to the first fixed end;

[0052] If the sampling signal is a DC signal, the first switch K1 is controlled to be closed, and the moving end and the second fixed end of the second switch K2 are controlled to be conductive.

[0053] It is understandable that when the switch controller 1 controls the first switch K1 to close and the moving end of the second switch K2 is connected to a fixed end, the switch controller 1 will receive a sampling signal, and determine the type of the sampling signal according to the value change trend of the sampling signal, including the increase and decrease trend of the value of the sampling signal, the zero point judgment, etc., so as to adjust the second switch K2 to the conduction state most suitable for the current sampling signal, and the type of the sampling signal includes a differential signal or a DC signal. At the same time, the switch controller 1 can further adjust the sampling frequency and sampling accuracy according to the value change trend of the sampling signal, so as to ensure the accuracy of the sampling.

[0054] The embodiment of the present application utilizes a switch controller to flexibly control the switch states of the first switch and the second switch according to different sampling signals, thereby ensuring that the entire circuit structure of the first switch, the second switch, the signal conditioning unit and the AD converter can collect correct and accurate sampling signals. The acquisition device can meet the sampling requirements of different sampling signals, has the advantages of strong versatility, wide application range and flexible configuration, and greatly reduces the device configuration cost of signal acquisition.

[0055] The embodiment of the present invention discloses a specific analog quantity adaptive acquisition device. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Figure 2 As shown:

[0056] In some specific embodiments, the signal conditioning unit 2 includes an impedance-adjustable matching impedance circuit 20 for controlling the acquisition range and acquisition accuracy of the sampling signal.

[0057] It can be understood that the connection of matching impedance circuits with different impedances can realize the scaling adjustment of signals of different proportions, meet the sampling requirements of different sampling signals, and thus ensure the sampling accuracy.

[0058] In some specific embodiments, the signal conditioning unit 2 includes a first processing circuit 21, a matching impedance circuit 20, and a second processing circuit 22. The matching impedance circuit 20 includes a third switch K3 and two matching impedance sub-units 201 with different impedances, wherein:

[0059] The first end and the second end of the first processing circuit 21 serve as the first input end and the second input end of the signal conditioning unit 2 respectively; the third switch K3 is a single-pole double-throw switch, the movable end of the third switch K3 is connected to the third end of the first processing circuit 21, the first fixed end and the second fixed end of the third switch K3 are respectively connected to the first ends of the two matching impedance sub-units 201, and the second ends of the two matching impedance sub-units 201 are both connected to the first end of the second processing circuit 22; the second end of the second processing circuit 22 serves as the output end of the signal conditioning unit 2.

[0060] It can be understood that the effect of adjustable impedance of the matching impedance circuit 20 can be achieved by connecting the third switch K3 between the first processing circuit 21 and the second processing circuit 22 and two matching impedance sub-units 201 with different impedances, or by other impedance adjustment methods, such as multiple switches and multiple different matching impedance sub-units, and achieving the effect of different impedances between the first processing circuit 21 and the second processing circuit 22 through different states of multiple switches, and another example is the connection of a variable resistor. The specific implementation method of the matching impedance circuit 20 is not limited here.

[0061] In some specific embodiments, the analog quantity adaptive acquisition device further includes a self-checking unit 4, which is used to output a self-checking signal;

[0062] The first switch K1 is a single-pole double-throw switch, a first fixed end of the first switch K1 is connected to the first signal input end ip1, a second fixed end of the first switch K1 is connected to the output end of the self-test unit 4, and a moving end of the first switch K1 is connected to the first input end of the signal conditioning unit 2;

[0063] When the switch controller 1 is in the acquisition mode, the switch controller 1 controls the first fixed end and the moving end of the first switch K1 to be connected;

[0064] When the switch controller 1 is in the self-test mode, the switch controller 1 controls the second fixed end and the moving end of the first switch K1 to be conductive, and controls the second fixed end and the moving end of the second switch K2 to be conductive.

[0065] It can be understood that when the switch controller 1 is in the acquisition mode, the analog quantity adaptive acquisition device obtains the acquisition signal from the outside input through the first signal input terminal ip1 and / or the second signal input terminal ip2; when the switch controller 1 is in the self-test mode, the analog quantity adaptive acquisition device no longer accepts the external acquisition signal, collects the internal self-test signal, and compares the self-test signal finally collected by the switch controller 1 with the self-test signal output by the self-test unit 4, thereby determining whether the current analog quantity adaptive acquisition device has a fault and the acquisition accuracy of the circuit.

[0066] In some specific embodiments, the switch controller 1 switches between the acquisition mode and the self-test mode at a preset frequency. Specifically, the switching frequency can reach microsecond level.

[0067] It is understandable that the self-test signal output by the self-test unit 4 can be either a constant signal or a signal with adjustable parameters, which can be set according to actual experience requirements.

[0068] In some specific embodiments, the switch controller 1 controls the self-test unit 4 to output a corresponding self-test signal.

[0069] In some specific embodiments, the self-test unit 4 includes:

[0070] A fourth single-pole double-throw switch K4 switched by the switch controller 1;

[0071] Two self-test signal sources 40;

[0072] The first fixed end and the second fixed end of the fourth switch K4 are connected to the output ends of the two self-test signal sources 40 respectively, and the movable end of the fourth switch K4 serves as the output end of the self-test unit 4 .

[0073] It can be understood that the switch controller 1 controls the fourth switch K4 to output a specific self-test signal, and the two self-test signal sources 40 can be signal sources that output different self-test signals, or can be two signal sources that are mutually primary and standby and output the same self-test signal.

[0074] In some specific embodiments, the analog quantity adaptive acquisition device further includes an isolation unit 5 , an input end of the isolation unit 5 is connected to an output end of the AD converter 3 , and an output end of the isolation unit 5 outputs a sampling signal to the switch controller 1 .

[0075] It can be understood that the isolation unit 5 isolates the switch controller 1 from other circuits, thereby ensuring circuit safety and signal safety, so that the sampling signal is sent to the switch controller 1 truthfully, completely and timely under the guarantee of a safe and reliable communication protocol.

[0076] In some specific embodiments, the switch controller is specifically an MCU or an FPGA or a CPU.

[0077] In some specific embodiments, the analog quantity adaptive acquisition device further includes a display screen connected to the switch controller. Further, the analog quantity adaptive acquisition device further includes: a communication unit connected to the switch controller. In some specific embodiments, the communication unit is specifically a wireless communication unit. Further, the switch controller 1 can also be connected to a more advanced control host, monitor, command input device and other hardware, which can be added according to the needs, and will not be repeated here.

[0078] It can be seen that the switch controller 1 adjusts the states of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 according to the needs to meet the needs of the acquisition device in different situations, so that the acquisition device can meet the sampling needs of different sampling signals. It has the advantages of strong versatility, wide application range, and flexible configuration, which greatly reduces the configuration cost of the signal acquisition device.

[0079] Correspondingly, an embodiment of the present application also discloses a rail transit signal acquisition system, including the analog quantity adaptive acquisition device as described in any one of the above items.

[0080] Correspondingly, an embodiment of the present application further discloses a chip, comprising an integrated circuit of the analog quantity adaptive acquisition device as described in any one of the above items.

[0081] For details about the analog quantity adaptive acquisition device, please refer to the relevant description in the above embodiment, which will not be repeated here.

[0082] Among them, the rail transit signal acquisition system and chip in this embodiment have the same technical effects as the analog adaptive acquisition device in the above embodiment, which will not be repeated here.

[0083] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0084] The above is a detailed introduction to an analog adaptive acquisition device, a rail transit signal acquisition system and a chip provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An analog quantity adaptive acquisition device, characterized in that: The invention comprises a switch controller, a first switch, a second switch, a signal conditioning unit, an AD converter and a self-test unit, wherein the self-test unit is used to output a self-test signal, wherein: The first switch is a single-pole double-throw switch, a first fixed end of the first switch is connected to the first signal input end, a second fixed end of the first switch is connected to the output end of the self-test unit, and a moving end of the first switch is connected to the first input end of the signal conditioning unit; The second switch is a single-pole double-throw switch, a first fixed end of the second switch is connected to the second signal input end, a second fixed end of the second switch is grounded, and a moving end of the second switch is connected to the second input end of the signal conditioning unit; The output end of the signal conditioning unit is connected to the input end of the AD converter; The output end of the AD converter outputs a sampling signal; The switch controller is used to receive the sampling signal and control the switch states of the first switch and the second switch according to the sampling signal; when the switch controller is in the acquisition mode, the switch controller controls the first fixed end and the moving end of the first switch to be turned on; when the switch controller is in the self-test mode, the switch controller controls the second fixed end and the moving end of the first switch to be turned on, and controls the second fixed end and the moving end of the second switch to be turned on; Wherein, the switch controller is specifically used for: According to the value change trend of the sampling signal, determining whether the sampling signal is a differential signal or a DC signal; If the sampling signal is the differential signal, the first fixed end and the moving end of the first switch are controlled to be connected, and the moving end and the first fixed end of the second switch are controlled to be connected; If the sampling signal is the DC signal, the first fixed end and the moving end of the first switch are controlled to be conductive, and the moving end and the second fixed end of the second switch are controlled to be conductive.

2. The analog quantity adaptive acquisition device according to claim 1, characterized in that: The signal conditioning unit includes a matching impedance circuit with adjustable impedance, which is used to control the acquisition range and acquisition accuracy of the sampling signal.

3. The analog quantity adaptive acquisition device according to claim 2, characterized in that: The signal conditioning unit comprises a first processing circuit, the matching impedance circuit and a second processing circuit, the matching impedance circuit comprises a third switch and two matching impedance sub-units with different impedances, wherein: The first end and the second end of the first processing circuit serve as the first input end and the second input end of the signal conditioning unit respectively; the third switch is a single-pole double-throw switch, the movable end of the third switch is connected to the third end of the first processing circuit, the first fixed end and the second fixed end of the third switch are respectively connected to the first ends of the two matching impedance sub-units, and the second ends of the two matching impedance sub-units are both connected to the first end of the second processing circuit; the second end of the second processing circuit serves as the output end of the signal conditioning unit.

4. The analog quantity adaptive acquisition device according to claim 1, characterized in that: The switch controller switches between the acquisition mode and the self-test mode according to a preset frequency.

5. The analog quantity adaptive acquisition device according to claim 4, characterized in that: The switch controller controls the self-test unit to output the corresponding self-test signal.

6. The analog quantity adaptive acquisition device according to claim 5, characterized in that: The self-test unit comprises: a fourth single-pole double-throw switch controlled by the switch controller; Two self-test signal sources; The first fixed end and the second fixed end of the fourth switch are respectively connected to the output ends of the two self-test signal sources, and the movable end of the fourth switch serves as the output end of the self-test unit.

7. The analog quantity adaptive acquisition device according to claim 6, characterized in that: It also includes an isolation unit, the input end of the isolation unit is connected to the output end of the AD converter, and the output end of the isolation unit outputs the sampling signal to the switch controller.

8. The analog quantity adaptive acquisition device according to any one of claims 1 to 7, characterized in that: The switch controller is specifically an MCU or an FPGA or a CPU.

9. The analog quantity adaptive acquisition device according to claim 8, characterized in that: Also includes: A display screen connected to the switch controller.

10. The analog quantity adaptive acquisition device according to claim 8, characterized in that: Also includes: A communication unit connected to the switch controller.

11. The analog quantity adaptive acquisition device according to claim 10, characterized in that: The communication unit is specifically a wireless communication unit.

12. A rail transit signal acquisition system, characterized in that: It comprises the analog quantity adaptive acquisition device as claimed in any one of claims 1 to 11.

13. A chip, characterized in that: An integrated circuit comprising the analog quantity adaptive acquisition device as claimed in any one of claims 1 to 11.

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