CN116027696B - Analog quantity self-adaptive acquisition device, rail traffic signal acquisition system and chip - Google Patents
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Abstract
The application discloses an analog quantity self-adaptive acquisition device, a rail transit signal acquisition system and a chip, wherein the analog quantity self-adaptive acquisition device comprises a switch controller, a first switch, a second switch, a signal conditioning unit and an AD converter, wherein a first end of the first switch is connected with a first signal input end, a second end of the first switch is connected with a first input end of the signal conditioning unit, a first fixed end of the second switch is connected with a second signal input end, a second fixed end of the second switch is grounded, a movable end of the second switch is connected with a second input end of the signal conditioning unit, an output end of the signal conditioning unit is connected with an input end of the AD converter, an output end of the AD converter outputs sampling signals, and the switch controller is used for receiving the sampling signals and controlling the switch states of the first switch and the second switch according to the sampling signals. The acquisition device can meet the sampling requirements of different sampling signals, and greatly reduces the configuration cost of the device for signal acquisition.
Description
Technical Field
The invention relates to the field of signal processing, in particular to an analog quantity self-adaptive acquisition device, a rail transit signal acquisition system and a chip.
Background
In recent years, with the development of urban rail transit, the rail transit safety industry has put forward higher flexible configuration and resource requirements on signal systems, traction control systems, network control systems, brake systems, vehicle logic control systems, power supply systems and the like, wherein signal acquisition of the signal systems is a control premise of all the above systems. The function of current signal acquisition device is comparatively single fixed, is difficult to nimble satisfy different signal acquisition's demand, can only install the signal acquisition device of a plurality of different functions, leads to signal system's cost to improve by a wide margin.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide an analog adaptive acquisition device, a rail traffic signal acquisition system and a chip. The specific scheme is as follows:
The utility model provides an analog quantity self-adaptation collection system, includes switch controller, first switch, second switch, signal conditioning unit, AD converter, wherein:
The first end of the first switch is connected with a first signal input end, and the second end of the first switch is connected with 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 with a second signal input end, a second fixed end of the second switch is grounded, and a movable end of the second switch is connected with a second input end of the signal conditioning unit;
the output end of the signal conditioning unit is connected with the input end of the AD converter;
The output end of the AD converter outputs a sampling signal;
The switch controller is used for receiving the sampling signal and controlling the switch states of the first switch and the second switch according to the sampling signal.
Preferably, the switch controller is specifically configured to:
judging whether the sampling signal is a differential signal or a DC signal according to the numerical variation trend of the sampling signal;
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 conducted with the first fixed end;
and if the sampling signal is the DC signal, controlling the first switch to be closed, and controlling the movable end and the second fixed end of the second switch to be conducted.
Preferably, the signal conditioning unit includes a matching impedance circuit with adjustable impedance, for controlling the acquisition range and the acquisition accuracy of the sampling signal.
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 subunits with different impedances, wherein:
The first end and the second end of the first processing circuit are respectively used as a first input end and a second input end of the signal conditioning unit, the third switch is a single-pole double-throw switch, the moving end of the third switch is connected with the third end of the first processing circuit, the first moving end and the second moving end of the third switch are respectively connected with the first ends of the two matched impedance subunits, the second ends of the two matched impedance subunits are respectively connected with the first end of the second processing circuit, and the second end of the second processing circuit is used as the output end of the signal conditioning unit.
Preferably, the analog quantity self-adaptive acquisition device further comprises a self-checking unit, and the self-checking unit is used for outputting self-checking signals;
The first switch is a single-pole double-throw switch, a first fixed end of the first switch is connected with the first signal input end, a second fixed end of the first switch is connected with the output end of the self-checking unit, and a movable end of the first switch is connected with the first input end of the signal conditioning unit;
When the switch controller is in an acquisition mode, the switch controller controls the first fixed end and the movable end of the first switch to be conducted;
when the switch controller is in a self-checking mode, the switch controller controls the second fixed end and the movable end of the first switch to be conducted, and simultaneously controls the second fixed end and the movable end of the second switch to be conducted.
Preferably, the switch controller switches the acquisition mode and the self-checking mode according to a preset frequency.
Preferably, the switch controller controls the self-checking unit to output the corresponding self-checking signal.
Preferably, the self-checking unit includes:
a single pole double throw fourth switch controlled by the switch controller;
Two self-checking signal sources;
The first fixed end and the second fixed end of the fourth switch are respectively connected with the output ends of the two self-checking signal sources, and the movable end of the fourth switch is used as the output end of the self-checking unit.
Preferably, the analog quantity self-adaptive acquisition device further comprises an isolation unit, wherein the input end of the isolation unit is connected with the output end of the AD converter, and the output end of the isolation unit outputs the sampling signal to the switch controller.
Preferably, the switch controller is specifically an MCU or an FPGA or a CPU.
Preferably, the analog quantity adaptive acquisition device further includes:
and the display screen is connected with the switch controller.
Preferably, the analog quantity adaptive acquisition device further includes:
and the communication unit is connected with the switch controller.
Preferably, the communication unit is specifically a wireless communication unit.
Correspondingly, the application also discloses a track traffic signal acquisition system which comprises the analog quantity self-adaptive acquisition device.
Correspondingly, the application also discloses a chip which comprises the integrated circuit of the analog quantity self-adaptive acquisition device.
The application discloses an analog quantity self-adaptive acquisition device which comprises a switch controller, a first switch, a second switch, a signal conditioning unit and an AD converter, wherein a first end of the first switch is connected with a first signal input end, a second end of the first switch is connected with a 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 with a second signal input end, a second fixed end of the second switch is grounded, a movable end of the second switch is connected with a second input end of the signal conditioning unit, an output end of the signal conditioning unit is connected with an input end of the AD converter, and an output end of the AD converter outputs a sampling signal. The application uses the 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 whole circuit structures of the first switch, the second switch, the signal conditioning unit and the AD converter can acquire correct and accurate sampling signals.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing a structure of an analog quantity adaptive acquisition device according to an embodiment of the present invention;
Fig. 2 is a structural diagram of a specific analog adaptive acquisition device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The function of current signal acquisition device is comparatively single fixed, is difficult to nimble satisfy different signal acquisition's demand, can only install the signal acquisition device of a plurality of different functions, leads to signal system's cost to improve by a wide margin. The application uses the 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 whole circuit structures of the first switch, the second switch, the signal conditioning unit and the AD converter can acquire correct and accurate sampling signals.
The embodiment of the invention discloses an analog quantity self-adaptive acquisition device, which is shown in fig. 1 and comprises a switch controller 1, a first switch K1, a second switch K2, a signal conditioning unit 2 and an AD converter 3, wherein:
a first end of the first switch K1 is connected with a first signal input end ip1, and a second end of the first switch K1 is connected with a first input end of the signal conditioning unit 2;
the second switch K2 is a single-pole double-throw switch, the first fixed end of the second switch K2 is connected with the second signal input end ip2, the second fixed end of the second switch K2 is grounded, and the movable end of the second switch K2 is connected with the second input end of the signal conditioning unit 2;
the output end of the signal conditioning unit 2 is connected with the input end of the AD converter 3;
the output end of the AD converter 3 outputs a sampling signal;
The switch controller 1 is configured to receive the sampling signal and control the switch states of the first switch K1 and the second switch K2 according to the sampling signal.
Further, the switch controller 1 is specifically configured to:
Judging the sampling signal as a differential signal or a DC signal according to the numerical variation trend of the sampling signal;
If the sampling signal is a differential signal, the first switch K1 is controlled to be closed, and the movable end of the second switch K2 is controlled to be conducted with the first fixed end;
if the sampling signal is a DC signal, the first switch K1 is controlled to be closed, and the movable end and the second fixed end of the second switch K2 are controlled to be conducted.
It can be understood that when the switch controller 1 controls the first switch K1 to be closed and the movable end of the second switch K2 to be connected with a certain 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 increasing and decreasing trend of the value of the sampling signal, zero crossing point judgment, and the like, so as to adjust the second switch K2 to be in a conducting state most suitable for the current sampling signal, where the type of the sampling signal includes a differential signal or a DC signal. Meanwhile, the switch controller 1 can further adjust the sampling frequency and the sampling precision according to the numerical variation trend of the sampling signal, thereby ensuring the sampling accuracy.
The embodiment of the application uses the 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 whole circuit structures of the first switch, the second switch, the signal conditioning unit and the AD converter can acquire correct and accurate sampling signals.
The embodiment of the invention discloses a specific analog quantity self-adaptive acquisition device, and compared with the previous embodiment, the embodiment further describes and optimizes the technical scheme. Specifically, see fig. 2:
In some specific embodiments, the signal conditioning unit 2 includes an impedance-adjustable matching impedance circuit 20 for controlling the acquisition range and the acquisition accuracy of the sampled signal.
It can be understood that the matching impedance circuits with different impedances are connected, so that scaling adjustment of signals with different proportions can be realized, the sampling requirements of different sampling signals are met, and the sampling accuracy is ensured.
In some specific embodiments, the signal conditioning unit 2 comprises a first processing circuit 21, a matching impedance circuit 20 and a second processing circuit 22, the matching impedance circuit 20 comprising a third switch K3 and two matching impedance subunits 201 of different impedance, wherein:
The first end and the second end of the first processing circuit 21 are respectively used as the first input end and the second input end of the signal conditioning unit 2, the third switch K3 is a single-pole double-throw switch, the moving end of the third switch K3 is connected with the third end of the first processing circuit 21, the first moving end and the second moving end of the third switch K3 are respectively connected with the first ends of the two matching impedance sub-units 201, the second ends of the two matching impedance sub-units 201 are respectively connected with the first end of the second processing circuit 22, and the second end of the second processing circuit 22 is used as the output end of the signal conditioning unit 2.
It will be appreciated that the effect of the impedance adjustment of the matching impedance circuit 20 may be achieved by connecting the third switch K3 and the two matching impedance subunits 201, which are different from each other, between the first processing circuit 21 and the second processing circuit 22, or by other impedance adjustment methods, such as a plurality of switches and a plurality of different matching impedance subunits, and by different states of the plurality of switches, the effect of the impedance difference between the first processing circuit 21 and the second processing circuit 22 is achieved, for example, by connecting a varistor, and the specific embodiment of the matching impedance circuit 20 is not limited herein.
In some specific embodiments, the analog quantity adaptive acquisition device further comprises a self-checking unit 4, configured to output a self-checking signal;
The first switch K1 is a single-pole double-throw switch, a first fixed end of the first switch K1 is connected with the first signal input end ip1, a second fixed end of the first switch K1 is connected with the output end of the self-checking unit 4, and a movable end of the first switch K1 is connected with the first input end of the signal conditioning unit 2;
when the switch controller 1 is in the acquisition mode, the switch controller 1 controls the first fixed end and the movable end of the first switch K1 to be conducted;
When the switch controller 1 is in the self-checking mode, the switch controller 1 controls the second stationary terminal and the moving terminal of the first switch K1 to be turned on, and simultaneously controls the second stationary terminal and the moving terminal of the second switch K2 to be turned on.
It can be understood that when the switch controller 1 is in the acquisition mode, the analog quantity self-adaptive acquisition device acquires an external acquisition signal input through the first signal input end ip1 and/or the second signal input end ip2, and when the switch controller 1 is in the self-detection mode, the analog quantity self-adaptive acquisition device does not accept the external acquisition signal any more, acquires an internal self-detection signal, compares the self-detection signal finally acquired by the switch controller 1 with the self-detection signal output by the self-detection unit 4, and further determines whether the current analog quantity self-adaptive acquisition device fails or not and the acquisition accuracy of the circuit.
In some specific embodiments, the switch controller 1 switches the acquisition mode and the self-test mode according to a preset frequency. In particular, the switching frequency may be on the order of microseconds.
It can be understood that the self-checking signal output by the self-checking unit 4 may be a constant signal or a signal with adjustable parameters, which is specifically set according to actual experience requirements.
In some specific embodiments, the switch controller 1 controls the self-test unit 4 to output a corresponding self-test signal.
In some specific embodiments, self-test unit 4 comprises:
a single pole double throw fourth switch K4 switched by the switch controller 1;
two self-test signal sources 40;
The first and second fixed ends 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.
It can be understood that, the switch controller 1 controls the fourth switch K4 to output a specific self-checking signal, and the two self-checking signal sources 40 may be signal sources that output different self-checking signals, or may be two signal sources that are primary and secondary and output the same self-checking signal.
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.
It can be understood that the isolation unit 5 isolates the switch controller 1 from other circuits, thereby ensuring circuit safety and signal safety, and enabling the sampling signal to be truly, completely and timely sent to the switch controller 1 under the guarantee of a safe and reliable communication protocol.
In some specific embodiments, the switch controller is specifically an MCU or FPGA or CPU.
In some specific embodiments, the analog quantity adaptive acquisition device further comprises a display screen connected with the switch controller. Further, the analog quantity self-adaptive acquisition device also comprises a communication unit connected with the switch controller. In some embodiments, the communication unit is in particular a wireless communication unit. Furthermore, the switch controller 1 may be further connected to a higher-level control host, a monitor, an instruction input device, and other hardware, which is specifically added according to the requirement, and will not be described herein.
Therefore, 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 requirements, so as to meet the requirements of the acquisition device under different conditions, enable the acquisition device to meet the sampling requirements of different sampling signals, and have the advantages of strong universality, wide application range and flexible configuration, and greatly reduce the configuration cost of the device for signal acquisition.
Correspondingly, the embodiment of the application also discloses a track traffic signal acquisition system which comprises the analog quantity self-adaptive acquisition device.
Correspondingly, the embodiment of the application also discloses a chip which comprises the integrated circuit of the analog quantity self-adaptive acquisition device.
Details of the analog adaptive acquisition device may refer to the related descriptions in the above embodiments, and are not described herein.
The track traffic signal acquisition system and the chip in this embodiment have the same technical effects as the analog quantity adaptive acquisition device in the above embodiment, and are not described herein.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing describes the analog adaptive acquisition device, the rail traffic signal acquisition system and the chip provided by the present invention in detail, and specific examples are used herein to illustrate the principles and embodiments of the present invention, and the description of the foregoing examples is only for aiding in understanding the method and core concept of the present invention, and meanwhile, for those skilled in the art, according to the concept of the present invention, there are variations in the specific embodiments and application ranges, so the disclosure should not be construed as limiting the present invention.
Claims (13)
1. The utility model provides an analog quantity self-adaptation collection system, its characterized in that includes switch controller, first switch, second switch, signal conditioning unit, AD converter and self-checking unit, self-checking unit is used for exporting self-checking signal, wherein:
the first switch is a single-pole double-throw switch, a first fixed end of the first switch is connected with a first signal input end, a second fixed end of the first switch is connected with the output end of the self-checking unit, and a movable end of the first switch is connected with 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 with a second signal input end, a second fixed end of the second switch is grounded, and a movable end of the second switch is connected with a second input end of the signal conditioning unit;
the output end of the signal conditioning unit is connected with the input end of the AD converter;
The output end of the AD converter outputs a sampling signal;
The switch controller is used for receiving the sampling signal and controlling the switch states of the first switch and the second switch according to the sampling signal, and when the switch controller is in an acquisition mode, the switch controller controls the first fixed end and the movable end of the first switch to be conducted;
Wherein the switch controller is specifically configured to:
judging whether the sampling signal is a differential signal or a DC signal according to the numerical variation trend of the sampling 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 conducted, and the moving end and the first fixed end of the second switch are controlled to be conducted;
and if the sampling signal is the DC signal, controlling the first fixed end and the movable end of the first switch to be conducted, and controlling the movable end and the second fixed end of the second switch to be conducted.
2. The analog quantity adaptive acquisition device according to claim 1, wherein the signal conditioning unit includes an impedance-adjustable matching impedance circuit for controlling an acquisition range and an acquisition accuracy of the sampling signal.
3. The analog adaptive acquisition device of claim 2, wherein the signal conditioning unit comprises a first processing circuit, the matching impedance circuit, and a second processing circuit, the matching impedance circuit comprising a third switch and two matching impedance subunits of different impedances, wherein:
The first end and the second end of the first processing circuit are respectively used as a first input end and a second input end of the signal conditioning unit, the third switch is a single-pole double-throw switch, the moving end of the third switch is connected with the third end of the first processing circuit, the first moving end and the second moving end of the third switch are respectively connected with the first ends of the two matched impedance subunits, the second ends of the two matched impedance subunits are respectively connected with the first end of the second processing circuit, and the second end of the second processing circuit is used as the output end of the signal conditioning unit.
4. The analog quantity adaptive sampling device according to claim 1, wherein the switching controller switches the sampling mode and the self-checking mode according to a preset frequency.
5. The analog quantity adaptive acquisition device according to claim 4, wherein the switch controller controls the self-checking unit to output the corresponding self-checking signal.
6. The analog adaptive acquisition device according to claim 5, wherein the self-test unit includes:
a single pole double throw fourth switch controlled by the switch controller;
Two self-checking signal sources;
The first fixed end and the second fixed end of the fourth switch are respectively connected with the output ends of the two self-checking signal sources, and the movable end of the fourth switch is used as the output end of the self-checking unit.
7. The analog quantity adaptive sampling device according to claim 6, further comprising an isolation unit, wherein 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.
8. The analog adaptive acquisition device according to any one of claims 1 to 7, wherein the switch controller is in particular an MCU or an FPGA or a CPU.
9. The analog adaptive acquisition device of claim 8, further comprising:
and the display screen is connected with the switch controller.
10. The analog adaptive acquisition device of claim 8, further comprising:
and the communication unit is connected with the switch controller.
11. The analog adaptive acquisition device according to claim 10, wherein the communication unit is in particular a wireless communication unit.
12. A rail transit signal acquisition system comprising an analog adaptive acquisition device according to any one of claims 1 to 11.
13. A chip comprising an integrated circuit of an analog quantity adaptive acquisition device according to any one of claims 1 to 11.
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| CN111181561A (en) * | 2020-02-14 | 2020-05-19 | 南京开思智造科技有限公司 | Signal self-adaptive acquisition terminal and acquisition method |
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| US5180932A (en) * | 1990-03-15 | 1993-01-19 | Bengel David W | Current mode multiplexed sample and hold circuit |
| US7750628B2 (en) * | 2007-06-30 | 2010-07-06 | Cirrus Logic, Inc. | Magnetic field sensor circuit with common-mode voltage nulling |
| CN203825408U (en) * | 2014-03-21 | 2014-09-10 | 东风商用车有限公司 | Self-adaptive recognition and acquisition system for automobile switch signals |
| US10163521B2 (en) * | 2016-10-11 | 2018-12-25 | Microchip Technology Incorporated | High voltage bootstrap sampling circuit |
| CN109374942A (en) * | 2017-08-04 | 2019-02-22 | 许继集团有限公司 | A kind of DC voltage and DC current signal adaptive sampling circuit and method |
| CN112816782A (en) * | 2020-12-29 | 2021-05-18 | 中国船舶重工集团有限公司第七一0研究所 | Device for measuring multichannel on-resistance and insulation resistance by four-wire system |
| CN113408685B (en) * | 2021-06-02 | 2023-02-03 | 西安电子科技大学 | Radio frequency energy acquisition system based on energy management and passive radio frequency tag |
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