CN217766644U - Digital signal concentrator based on multi-channel digital signal acquisition system - Google Patents
Digital signal concentrator based on multi-channel digital signal acquisition system Download PDFInfo
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- CN217766644U CN217766644U CN202220835689.XU CN202220835689U CN217766644U CN 217766644 U CN217766644 U CN 217766644U CN 202220835689 U CN202220835689 U CN 202220835689U CN 217766644 U CN217766644 U CN 217766644U
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Abstract
The utility model provides a digital signal concentrator based on multichannel digital signal acquisition system, the utility model discloses owing to adopted anti magnetic interference and filtering capability's power conversion unit, and trigger signal keeps apart the unit, probe signal switching unit, the signal concentrator body that probe signal isolation unit and probe power short-circuit unit combined together and constitute, therefore it can have power protection mechanism and function, through the mode of a plurality of probe switching return signals, the warehouse entry cable of having avoided multichannel digital signal acquisition system front end and probe connection is too much, it is too close, cause the cable part too complicated, the defect of cable damage and short circuit takes place easily, do not influence pipeline detector interface flange mechanical properties, gather multiunit composite probe and transmission signal, and send the signal of gathering together for acquisition system, and realize the isolation of inputing output and the isolation of power, the quantity of warehouse entry line has obviously been reduced, the quality of detector has been improved.
Description
Technical Field
The utility model relates to a digital signal collector specifically is a digital signal concentrator based on multichannel digital signal collection system, is applicable to the multichannel digital signal collection system's of pipeline detection ware signal acquisition front end, belongs to pipeline detection technical field.
Background
At present, when a multi-channel digital signal acquisition system of a pipeline detector acquires data of composite probes, the number of the composite probes is large. If each probe is individually connected to the acquisition system, then the entry lines will be numerous. When the flange is connected subsequently, the connector on the flange is too large and too dense, so that the difficulty is increased when the connector is connected, meanwhile, the mechanical performance of the pipeline detector is influenced due to the too large and too dense connector on the flange, and the water pressure resistance of the cabin body can be weakened.
The existing signal acquisition probe has no special signal conversion and collection line equipment, and has a plurality of warehouse entry lines, so that the cable part of the detector is too complex, and the interface design of a digital acquisition system is difficult.
Disclosure of Invention
The utility model aims at providing a digital signal concentrator based on multichannel digital signal acquisition system, it is too many with the cable of advancing of probe connection to have solved multichannel digital signal acquisition system front end, it is too close, cause the cable part too complicated, it damages and the short circuit problem to take place the cable easily, and connector interface design difficulty, influence pipeline detector interface flange mechanical properties's problem, gather multiunit composite probe and transmission signal, and send the signal of gathering together for acquisition system, and realize input/output's isolation and the isolation of power.
In order to achieve the above object, the utility model provides a digital signal concentrator based on multichannel digital signal acquisition system, including the signal concentrator body, the signal concentrator body embeds power conversion unit, the signal concentrator body is used for connecting the signal input port of detector probe and is used for connecting the signal output port of acquisition system, power conversion unit includes the anti-magnetic interference power conversion chip that is used for converting input mains voltage into signal concentrator body service voltage, power conversion unit input front end is connected with the power input filter capacitor who is used for filtering cable transmission interference, power conversion unit output rear end is connected with shielding inductance;
the signal hub body further includes: the device comprises a trigger signal isolation unit, a probe signal switching unit, a probe signal isolation unit and a probe power supply short-circuit protection unit;
the trigger signal isolation unit supplies power through the power supply conversion unit, a trigger signal is input through the input end of the trigger signal isolation unit, and the output end of the trigger signal isolation unit is respectively and correspondingly connected with the plurality of detector probes; the working frequency set by the trigger signal isolation unit is 5 ten thousand times of the switching frequency of the trigger signal, so that the input end and the output end of the trigger signal are isolated;
the probe signal switching unit is used for supplying power through the power supply conversion unit, the plurality of detector probes transmit probe return signals to the input end of the probe signal switching unit, a probe signal isolation unit is arranged between the probe signal switching unit and the probe return signals, the probe signal switching unit is used for rearranging the plurality of return signals and outputting the return signals of the plurality of detector probes to the acquisition system through a common data line;
the working frequency set by the probe signal isolation protection unit is 20 times of the switching frequency of the return signal, and the input end of the probe signal isolation unit is isolated from the signal output end of the signal concentrator body;
the probe power supply short-circuit protection unit is provided with a power supply isolation protection chip for isolating the power supply input end and the power supply output end of the signal concentrator body, and when one path of probe power supply is in short circuit with the ground, the power supply of the probe is cut off, so that the power supply of the signal concentrator body and other paths of probes cannot be influenced.
The utility model discloses the during operation, through converting the voltage that the signal concentrator body used into, connect outside detector probe through probe power short-circuit protection unit, then trigger and switch the select signal, switch the passageway to corresponding the passageway, trigger signal keeps apart the unit through trigger signal and transmits to corresponding detector probe, after corresponding detector probe received trigger signal, send the data of gathering back to the signal concentrator body, return data and loop through the probe signal isolation unit and the probe signal switching unit of signal concentrator body, send collection system to, then switch next probe passageway in proper order, send collection system to follow-up detector probe data is whole in proper order.
The model of the power supply conversion chip is SY8386A, and an electrolytic capacitor is connected to the input end of the power supply conversion chip so as to filter out interference generated by cable transmission in the transmission process from the probe detector electronic system to the signal concentrator; the signal concentrator body is used in a magnetic leakage detector and an eddy current detector, so that a power supply conversion chip and a peripheral circuit are provided with a strong anti-electromagnetic interference circuit and a strong anti-electromagnetic interference circuit, and an inductor connected with the output end of the power supply conversion chip is a shielding power inductor.
The model of the trigger signal isolation chip is SN74LVC1G17, the model of the probe signal switching unit is SN74CB3T3257, the model of the probe signal isolation chip is 74VHC245, and the model of the power isolation protection chip is TPS259631.
Compared with the prior art, the utility model discloses owing to adopted anti-magnetic interference and filtering capability's power conversion unit, and trigger signal keeps apart the unit, probe signal switching unit, the signal concentrator body that unit and probe power short-circuit unit combined together and constitute is kept apart to the probe signal, consequently, it can have power protection mechanism and function, through the mode of a plurality of probes switching return signal, the warehouse entry cable of having avoided multichannel digital signal acquisition system front end and probe connection is too much, it is too close, cause the cable part too complicated, the defect of cable damage and short circuit takes place easily, do not influence pipeline detector interface flange mechanical properties, gather multiunit composite probe and transmission signal, and send the signal that will gather together for acquisition system, and realize the isolation of input/output's isolation and power, the quantity of warehouse entry line has obviously been reduced, the quality of detector has been improved.
Drawings
Fig. 1 is the same block diagram of the principle of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, a digital signal concentrator based on a multi-channel digital signal acquisition system comprises a signal concentrator body, wherein a power supply conversion unit is arranged in the signal concentrator body, the signal concentrator body is used for connecting a signal input port of a detector probe and a signal output port of the acquisition system, the power supply conversion unit comprises a magnetic interference resistant power supply conversion chip for converting input power supply voltage into using voltage of the signal concentrator body, the model of the power supply conversion chip is SY8386A, and an electrolytic capacitor is connected to the input end of the power supply conversion chip so as to filter interference generated by cable transmission in the transmission process from a probe detector electronic system to the signal concentrator; because the signal concentrator body is used in the magnetic leakage detector and the eddy current detector, the power supply conversion chip and the peripheral circuit are provided with the circuits with stronger anti-electromagnetic interference and stronger anti-electromagnetic interference, and the inductor connected with the output end of the power supply conversion chip is a shielding power inductor.
The signal hub body further includes: the device comprises a trigger signal isolation unit, a probe signal switching unit, a probe signal isolation unit and a probe power supply short-circuit protection unit;
the trigger signal isolation unit supplies power through the power supply conversion unit, a trigger signal is input through the input end of the trigger signal isolation unit, and the output end of the trigger signal isolation unit is respectively and correspondingly connected with the plurality of detector probes; the trigger signal isolation unit is provided with a trigger signal isolation chip with the working frequency far greater than the switching frequency of the trigger signal, so that the input end and the output end of the trigger signal are isolated; the model of the trigger signal isolation chip is SN74LVC1G17;
the probe signal switching unit is used for supplying power through the power supply conversion unit, the probe return signals are transmitted to the input end of the probe signal switching unit by the plurality of detector probes, the probe signal isolation unit is arranged between the probe signal switching unit and the probe return signals, the probe signal switching unit is used for rearranging the plurality of return signals, and the return signals of the plurality of detector probes are output to the acquisition system through a common data line; the model of the probe signal switching unit is SN74CB3T3257;
the probe signal isolation unit is provided with a probe signal isolation chip with the working frequency far higher than the switching frequency of the return signal, and the input end of the probe signal isolation unit is isolated from the signal output end of the signal concentrator body; the model of the probe signal isolation chip is 74VHC245;
the probe power supply short-circuit protection unit is provided with a power supply isolation protection chip for isolating the power supply input end and the power supply output end of the signal concentrator body, when one path of probe power supply is in short circuit with the ground, the power supply of the probe is cut off, the power supply of the signal concentrator body and other paths of probes cannot be influenced, and the model of the power supply isolation protection chip is TPS259631.
Examples
The utility model provides a digital signal concentrator based on multichannel digital signal acquisition system, including the signal concentrator body that is used for connecting the signal input port of detector probe and is used for connecting acquisition system's signal output port, signal concentrator body mainly includes power conversion unit, trigger signal keeps apart the unit, probe signal switching unit, probe signal keeps apart the unit, probe power short-circuit protection unit, and wherein, power conversion unit's power conversion chip can adopt the SY8386A model for market, and power conversion unit does the utility model discloses a basis, 3.3V power that need use through power conversion chip with the 7.2V power conversion cost signal concentrator of input, wherein the design essential is: 1. when the probe detector electronic system is input, a large electrolytic capacitor is required to be connected so as to filter out interference generated by cable transmission in the transmission process from the probe detector electronic system to the signal concentrator; 2. the concentrator is used in a magnetic leakage detector and an eddy current detector, so that the power conversion chip and the peripheral circuit are provided with stronger anti-electromagnetic interference circuits and stronger anti-electromagnetic interference circuits. The inductor connected to the rear end of the power conversion unit is a shielding power inductor which is not influenced by an environmental magnetic field; 3. the 3.3V signal of the output of the power supply has small ripple through a proper layout. Because the power supply conversion unit supplies power to each chip in the signal concentrator body, errors can be generated in the output signal of the concentrator if the power supply part is unstable.
The trigger signal isolation unit is provided with a trigger isolation chip with the working frequency far higher than the switching frequency of the trigger signal, a commercially available SN74LVC1G17 model can be adopted, the input end and the output end of the trigger signal are isolated, the input and the output of a plurality of trigger signals are isolated, and the phenomenon that a power supply is connected with the trigger signal together to burn out the components of the concentrator and the components of the acquisition system due to the damage of a probe and a cable is avoided. Meanwhile, the working frequency of the isolated chip is far higher than the switching frequency of the trigger signal.
The probe signal switching unit may be a commercially available signal switching chip model SN74CB3T3257, and may output the return signals of the plurality of probes by rearranging the return signals through the common data line.
Probe signal isolation unit: the signal isolation chip with the working frequency far higher than the switching frequency of the return signals is arranged, a commercially available 74VHC245 model can be adopted, the input end of the return signals of the probes is isolated from the signal output end of the signal concentrator body, the input ends of the return signals of the probes are isolated from the output end of the concentrator, and the phenomenon that the power supply is connected with the signals of the probes to burn out the components of the concentrator and the components of the acquisition system due to damage of the probes and cables is avoided. Meanwhile, the working frequency of the isolated chip is far higher than the switching frequency of the return signal.
The probe power supply short-circuit protection unit is provided with a power supply isolation chip for isolating the power supply input end and the power supply output end of the concentrator, can adopt a commercially available TPS259631 model, cuts off the power supply of the probe when one path of probe power supply is short-circuited with the ground, does not influence the power supply of the concentrator and other paths of probes, separates the input and output power supplies of the concentrator, and avoids the influence of a power supply circuit on the concentrator caused by the damage of the probe and a cable. If the power supply of the probe is short-circuited with the ground, the power supply isolation protection of the path can cut off the power supply of the path of probe, but cannot influence the power supply and the work of the hub and other paths of probes.
The specific working principle is as follows:
the power conversion unit provides electric energy for each unit part in the signal concentrator body, converts 7.2V voltage entering the signal concentrator body into 3.3V voltage for the use of an internal chip, and meanwhile, the voltage entering the signal concentrator body is connected with a plurality of external detector probes through the probe power supply short-circuit protection unit to play a role in isolation. The detector sends a trigger signal of the channel 1, the trigger signal is transmitted to the detector probe 1 through the trigger signal isolation unit, the detector probe 1 sends acquired data back to the signal concentrator body after receiving the trigger signal, the returned data sequentially pass through the probe signal isolation unit and the probe signal switching unit of the signal concentrator body and are transmitted to the acquisition system, then the probe channels 2 to 6 are sequentially switched, all the subsequent detector probe data are transmitted to the acquisition system sequentially, and the switching function can be realized through a control switching chip of an Arm controller of the acquisition system.
The switching principle is as follows: the switching selection signal sent by the acquisition system comprises three paths a, b and c. If a =0, b =0, c =0, (0 is low level, and 1 is high level 3.3V) the return signal switching unit connects the output of the signal hub body to the probe return signal of the detector probe 1, at this time, the trigger signal 1 is started, and the return signal of the detector probe 1 is transmitted to the acquisition system through the signal hub body; then, the selection signals are switched, wherein a =0, b =0, c =1, so that the return signal switching unit connects the output of the signal hub body to the probe return signal of the detector probe 2, at this time, the trigger signal 2 is started, and the return signal of the detector probe 2 is transmitted to the acquisition system through the signal hub body; and by analogy, the return signals of different detector probes are transmitted back from the output signals of the signal concentrator body in sequence.
Claims (3)
1. A digital signal concentrator based on a multi-channel digital signal acquisition system comprises a signal concentrator body, wherein a power supply conversion unit is arranged in the signal concentrator body, and the signal concentrator body is connected with a signal input port of a detector probe and a signal output port of the acquisition system;
the signal hub body further includes: the device comprises a trigger signal isolation unit, a probe signal switching unit, a probe signal isolation unit and a probe power supply short-circuit protection unit;
the trigger signal isolation unit supplies power through the power supply conversion unit, a trigger signal is input through the input end of the trigger signal isolation unit, and the output end of the trigger signal isolation unit is respectively and correspondingly connected with the plurality of detector probes; the working frequency set by the trigger signal isolation unit is 5 ten thousand times of the switching frequency of the trigger signal, and the input end and the output end of the trigger signal are isolated;
the probe signal switching unit supplies power through the power supply conversion unit, the plurality of detector probes transmit probe return signals to the input end of the probe signal switching unit, a probe signal isolation unit is arranged between the probe signal switching unit and the probe return signals, and the probe signal switching unit outputs the return signals of the plurality of detector probes to the acquisition system through a common data line;
the working frequency set by the probe signal isolation protection unit is 20 times of the switching frequency of the return signal, and the input end of the probe signal isolation unit is isolated from the signal output end of the signal concentrator body;
the probe power supply short-circuit protection unit is provided with a power supply isolation protection chip for isolating the power supply input end and the power supply output end of the signal concentrator body.
2. The digital signal concentrator based on the multi-channel digital signal acquisition system as claimed in claim 1, wherein the power conversion chip is of type SY8386A, an electrolytic capacitor is connected to the input terminal of the power conversion chip, an anti-electromagnetic interference circuit is provided for the power conversion chip and the peripheral circuit, and the inductor connected to the output terminal of the power conversion chip is a shielding power inductor.
3. The digital signal concentrator based on the multichannel digital signal acquisition system as claimed in claim 1, wherein the model of the trigger signal isolation chip adopted by the trigger signal isolation unit is SN74LVC1G17, the model of the probe signal switching unit is SN74CB3T3257, the model of the probe signal isolation chip is 74VHC245, and the model of the power isolation protection chip is TPS259631.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220835689.XU CN217766644U (en) | 2022-04-12 | 2022-04-12 | Digital signal concentrator based on multi-channel digital signal acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220835689.XU CN217766644U (en) | 2022-04-12 | 2022-04-12 | Digital signal concentrator based on multi-channel digital signal acquisition system |
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| Publication Number | Publication Date |
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| CN217766644U true CN217766644U (en) | 2022-11-08 |
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| CN202220835689.XU Active CN217766644U (en) | 2022-04-12 | 2022-04-12 | Digital signal concentrator based on multi-channel digital signal acquisition system |
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