CN211579954U

CN211579954U - Single-power-supply synchronous data acquisition device

Info

Publication number: CN211579954U
Application number: CN201922172237.9U
Authority: CN
Inventors: 陈洁; 陈漫
Original assignee: Jiangsu Molit Technology Co ltd
Current assignee: Jiangsu Molit Technology Co ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-09-25
Anticipated expiration: 2029-12-06

Abstract

The utility model discloses a single power supply's synchronous data acquisition device, including BNC interface, single power supply full differential amplifier, single power instrument amplifier, single power anti-aliasing filter, analog-to-digital converter, Cortex-A8 treater, ethernet interface, power management module, the utility model discloses a through adopting the signal chain design of single power supply, and the power of digital part circuit also all is single power supply originally, and the power design of whole system is also greatly simplified like this, need not adopt bulky and ripple big DC-DC converter, has reduced consumption and complete machine volume simultaneously; due to the adoption of the single-power-supply chip design, the heat productivity of the whole machine is greatly reduced, and meanwhile, the electrical noise level is also greatly reduced, so that the signal-to-noise ratio of the system is also improved to a certain extent, and compared with a dual-power-supply device, the performance is also improved.

Description

Single-power-supply synchronous data acquisition device

Technical Field

The utility model relates to a civil engineering technical field, specific field is structure safety inspection.

Background

The multichannel synchronous vibration data acquisition instrument in the market at present has high power consumption and large volume, and some instruments can meet the thermal design requirements of the system even if a cooling fan or a large-volume radiator is added. The main reason for high power consumption and large device size is that the signal chain conditioning circuit design of the whole system still adopts the traditional dual power supply design, and although the dual power supply has the advantages of the dual power supply, such as the optimal performance of the operational amplifier and large dynamic range, the system power consumption, size and cost are sacrificed. With the development of the current semiconductor technology, the performances of more and more operational amplifiers, instrumentation amplifiers and differential amplifiers supporting single power supply can be compared favorably with a dual-power chip, and the performance requirements of the system are completely met. Another problem caused by the high power consumption of the device is that the device needs to consider the mains supply if used outdoors, and the application range of the device is limited in the occasions where the power supply is inconvenient.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a single power supply's synchronous data acquisition device to solve the problem that provides among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a synchronous data acquisition device powered by a single power supply comprises a BNC interface, a single power supply fully differential amplifier, a single power supply instrumentation amplifier, a single power supply anti-aliasing filter, an analog-to-digital converter, a Cortex-A8 processor, an Ethernet interface and a power supply management module, wherein the single power supply fully differential amplifier is in communication connection with the single power supply instrumentation amplifier and amplifies signals through the single power supply instrumentation amplifier, the single power supply instrumentation amplifier is in communication connection with the single power supply anti-aliasing filter, the BNC interface is electrically connected with the single power supply fully differential amplifier, the single power supply fully differential amplifier is in communication connection with the single power supply instrumentation amplifier, the single power supply instrumentation amplifier is in communication connection with the single power supply anti-aliasing filter, the single power supply anti-aliasing filter is electrically connected with the analog-to-digital converter, and the analog-to-digital converter is electrically connected with the Cortex-A8, the Cortex-A8 processor is in communication connection with the Ethernet interface, and the power management module supplies power to the BNC interface, the single-power-supply fully differential amplifier, the single-power-supply instrumentation amplifier, the single-power-supply anti-aliasing filter, the analog-to-digital converter, the Cortex-A8 processor and the Ethernet interface.

Preferably, the single-power supply fully-differential amplifier converts an external bipolar single-ended signal into a unipolar fully-differential output signal.

Preferably, the single power supply instrument amplifier amplifies the unipolar differential signal.

Preferably, the single power supply anti-aliasing filter filters a single polarity signal.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a synchronous data acquisition device of single power supply, the utility model discloses a through the signal chain design that adopts the single power, and the power of digital part circuit is also all single power supply originally, and the power design of whole system is also greatly simplified like this, need not adopt bulky and ripple big DC-DC converter, has reduced consumption and complete machine volume simultaneously; due to the adoption of the single-power-supply chip design, the heat productivity of the whole machine is greatly reduced, and meanwhile, the electrical noise level is also greatly reduced, so that the signal-to-noise ratio of the system is also improved to a certain extent, and compared with a dual-power-supply device, the performance is also improved.

Drawings

FIG. 1 is a block diagram of the system of the present invention;

fig. 2 is a circuit diagram of a single power supply fully differential amplifier of the present invention;

FIG. 3 is a circuit diagram of a single power supply instrumentation amplifier of the present invention;

fig. 4 is a circuit diagram of the anti-aliasing filter with single power supply according to the present invention.

In the figure: the system comprises a 1-BNC interface, a 2-single power supply fully differential amplifier, a 3-single power supply instrumentation amplifier, a 4-single power supply anti-aliasing filter, a 5-analog-to-digital converter, a 6-Cortex-A8 processor, a 7-Ethernet interface and an 8-power supply management module.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a synchronous data acquisition device powered by a single power supply comprises a BNC interface 1, a single power supply full differential amplifier 2, a single power supply instrumentation amplifier 3, a single power supply anti-aliasing filter 4, an analog-to-digital converter 5, a Cortex-A8 processor 6, an Ethernet interface 7 and a power supply management module 8, wherein the single power supply full differential amplifier 2 and the single power supply instrumentation amplifier 3 are in communication connection and amplify signals through the single power supply instrumentation amplifier 3, the single power supply instrumentation amplifier 3 is in communication connection with the single power supply anti-aliasing filter 4, the BNC interface 1 is electrically connected with the single power supply full differential amplifier 2, the single power supply full differential amplifier 2 is in communication connection with the single power supply instrumentation amplifier 3, the single power supply instrumentation amplifier 3 is in communication connection with the single power supply anti-aliasing filter 4, and the single power supply anti-aliasing filter 4 is electrically connected with the analog-to-digital converter, the analog-to-digital converter 5 is electrically connected with a Cortex-A8 processor 6, the Cortex-A8 processor 6 is in communication connection with an Ethernet interface 7, the power management module 8 supplies power to the BNC interface 1, the single-power-supply fully-differential amplifier 2, the single-power-supply instrumentation amplifier 3, the single-power-supply anti-aliasing filter 4, the analog-to-digital converter 5, the Cortex-A8 processor 6 and the Ethernet interface 7, and the power-supply fully-differential amplifier circuit selects THS4521, rail-to-rail output, 5V single-power supply and 1.14mA working current, so that the system design requirements are met. The specific operation and configuration refer to fig. 2. The single power supply instrument amplifier circuit selects AD8422, and the AD8422 is a precise, low-power-consumption and low-noise rail-to-rail instrument amplifier. The AD8422 processes the signal with ultra-low distortion performance, loading does not affect performance over the entire output range. The quiescent current is only 330 mua maximum. The resistor R5 is used for configuring the amplification factor of the instrumentation amplifier, and the resistor can be replaced by a coding resistor to realize the function of controllable gain. The single power supply anti-aliasing filter circuit adopts an active filter design and 4-order attenuation. The operational amplifier selects AD8608 four-channel, rail-to-rail input and output and single electricThe source amplifier has the characteristics of extremely low offset voltage, low input voltage and current noise, wide signal bandwidth and the like. These amplifiers adopt

Adjusting the patented technology, outstanding accuracy can be achieved without laser adjustment. The analog-to-digital converter can adopt ADS1278 to realize synchronous data acquisition of 8 channels.

The Cortex-A8 processor requires a certain amount of computation, and the AM3354 processor, a Reduced Instruction Set Computer (RISC) processor with up to 1GHz Sitara ARMCortex-A832 bits, a NEON single instruction stream multiple data Stream (SIMD) coprocessor, 32KB L1 instructions and 32KB, a data cache with unit error detection parity, a 256KB L2 cache with Error Correction Code (ECC), and a 176KB on-chip boot ROM are selected to meet the requirements of the system for peripheral control and data processing. Meanwhile, the system can enter and exit the control standby mode and the deep sleep mode to minimize the power consumption of the system. The single-power-supply instrument amplifier circuit is mainly used for amplifying a first-stage signal and improving the signal-to-noise ratio of the signal. The instrument amplifier is also supplied with power by a single power supply. Because the common mode voltage of the differential signal output by the full differential amplifier is Vocm 2.5V, the common mode voltage of the instrument amplifier is also set to 2.5V, the single power supply anti-aliasing filter circuit mainly functions to filter interference and reduce noise, the anti-aliasing filter is designed by adopting a single power supply operational amplifier, and because the signal is processed into a unipolar differential signal in a front-stage signal chain and the common mode voltage is 2.5V, the signal is just in the middle of a good signal chain power supply 5V, the circuit only needs to select single power supply operational amplifier. The main function of the analog-to-digital converter is to convert the signal processed by the signal chain into a digital signal. The Cortex-A8 processor is primarily responsible for the logic control of the analog-to-digital converter and for external data communication. The Ethernet interface is mainly responsible for sending packed data of the Cortex-A8 processor to an external server. The power management module is mainly responsible for providing constant voltage power to the analog and digital parts of the overall system.

Specifically, the single-power supply fully-differential amplifier 2 converts an external bipolar single-ended signal into a unipolar fully-differential output signal.

Specifically, the single power supply instrumentation amplifier 3 amplifies a unipolar differential signal.

Specifically, the single-power anti-aliasing filter 4 filters a single-polarity signal.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connection mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt prior art, and conventional model, including circuit connection adopts conventional connection mode among the prior art, does not detailed here again.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a synchronous data acquisition device of single power supply, includes BNC interface (1), single power supply full differential amplifier (2), single power supply instrumentation amplifier (3), single power supply anti-aliasing filter (4), analog-to-digital converter (5), Cortex-A8 treater (6), ethernet interface (7), power management module (8), its characterized in that: the single power supply full differential amplifier (2) is in communication connection with the single power supply instrumentation amplifier (3) and amplifies the signal through the single power supply instrumentation amplifier (3), the single power supply instrument amplifier (3) is in communication connection with the single power supply anti-aliasing filter (4), the BNC interface (1) is electrically connected with the single-power supply fully differential amplifier (2), the single power supply anti-aliasing filter (4) is electrically connected with the analog-to-digital converter (5), the analog-to-digital converter (5) is electrically connected with a Cortex-A8 processor (6), the Cortex-A8 processor (6) is connected in communication with an Ethernet interface (7), the power management module (8) supplies power for the BNC interface (1), the single-power full-differential amplifier (2), the single-power instrumentation amplifier (3), the single-power anti-aliasing filter (4), the analog-to-digital converter (5), the Cortex-A8 processor (6) and the Ethernet interface (7).

2. The single power supply synchronous data acquisition device of claim 1, wherein: the single-power supply fully-differential amplifier (2) converts an external bipolar single-ended signal into a unipolar fully-differential output signal.

3. The single power supply synchronous data acquisition device of claim 1, wherein: the single power supply instrument amplifier (3) amplifies the unipolar differential signal.

4. The single power supply synchronous data acquisition device of claim 1, wherein: the single-power supply anti-aliasing filter (4) filters the unipolar signals.