CN211579954U - Single-power-supply synchronous data acquisition device - Google Patents

Abstract

The utility model discloses a synchronous data acquisition device powered by a single power supply, comprising a BNC interface, a single power supply full differential amplifier, a single power supply instrumentation amplifier, a single power supply anti-aliasing filter, an analog-to-digital converter, and a Cortex-A8 processor , Ethernet interface, power management module, the utility model patent adopts the signal chain design of a single power supply, and the power supply of the digital part of the circuit is also powered by a single power supply, so that the power supply design of the entire system is also greatly simplified, without using a large volume In addition, the DC-DC converter with large ripple noise reduces power consumption and the overall size of the whole machine; due to the single power supply chip design, the heat generation of the whole machine is also greatly reduced, and the electrical noise level is also greatly reduced, making the system The signal-to-noise ratio has also been improved to a certain extent, and the performance will also be improved compared to devices powered by dual power supplies.

Description

A synchronous data acquisition device powered by a single power supply

technical field

The utility model relates to the technical field of civil engineering, and the specific field is structural safety detection.

Background technique

At present, the multi-channel synchronous vibration data acquisition instrument on the market has high power consumption and large volume, and some even need to add a cooling fan or a large-volume radiator to meet the thermal design requirements of the system. The main reason for the high power consumption and the large size of the device is that the signal chain conditioning circuit design of the entire system still adopts the traditional dual power supply design. But the sacrifice is system power consumption, size and cost. With the development of current semiconductor technology, more and more operational amplifiers, instrumentation amplifiers, and differential amplifiers that support single-supply power supply have performance comparable to dual-supply chips, fully meeting the performance requirements of the system. Another problem caused by the high power consumption of the equipment is that if the equipment is used outdoors, it is necessary to consider the mains power supply, which also limits the application range of the equipment when the power supply is inconvenient.

Utility model content

The purpose of the present invention is to provide a synchronous data acquisition device powered by a single power supply, so as to solve the problems raised in the above background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions: a synchronous data acquisition device powered by a single power supply, comprising a BNC interface, a single power supply full differential amplifier, a single power supply instrumentation amplifier, a single power supply anti-aliasing filter, an analog-digital A converter, a Cortex-A8 processor, an Ethernet interface, a power management module, the single power supply fully differential amplifier and the single power supply instrumentation amplifier are communicatively connected and the signal is amplified and processed by the single power supply instrumentation amplifier, the single power supply instrumentation amplifier It is connected in communication with a single power supply anti-aliasing filter, the BNC interface is electrically connected with a single power supply full differential amplifier, the single power supply full differential amplifier is in communication connection with a single power supply instrumentation amplifier, and the single power supply instrumentation amplifier is connected with a single power supply The anti-aliasing filter is communicatively connected, the single-supply anti-aliasing filter is electrically connected to an analog-to-digital converter, the analog-to-digital converter is electrically connected to the Cortex-A8 processor, and the Cortex-A8 processor is electrically connected to the Ethernet The interface is connected for communication, and the power management module supplies power for a BNC interface, a single-supply fully differential amplifier, a single-supply instrumentation amplifier, a single-supply anti-aliasing filter, an analog-to-digital converter, a Cortex-A8 processor, and an Ethernet interface.

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

Preferably, the single-supply instrumentation amplifier amplifies a unipolar differential signal.

Preferably, the single-supply anti-aliasing filter filters unipolar signals.

Compared with the prior art, the beneficial effect of the present invention is: a synchronous data acquisition device powered by a single power supply, the patent of the present invention adopts the signal chain design of a single power supply, and the power supply of the digital part circuit is originally a single power supply. power supply, so that the power supply design of the whole system is also greatly simplified, without using a DC-DC converter with large volume and high ripple noise, which reduces power consumption and the size of the whole machine at the same time; due to the single power supply chip design, the whole machine The heat generation is also greatly reduced, and 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 the performance will also be improved compared to the equipment powered by dual power supplies.

Description of drawings

Fig. 1 is the system block diagram of the present utility model;

2 is a circuit diagram of a single power supply full differential amplifier of the present invention;

3 is a circuit diagram of a single power supply instrumentation amplifier of the utility model;

FIG. 4 is a circuit diagram of a single power supply anti-aliasing filter of the present invention.

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

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

调整专利技术，无需激光调整便可达到出色的精度。模数转换器可采用ADS1278实现8通道的同步数据采集。1-4, the present utility model provides a technical solution: a synchronous data acquisition device powered by a single power supply, comprising a BNC interface 1, a single power supply full differential amplifier 2, a single power supply instrumentation amplifier 3, a single power supply anti-mixing A stack filter 4, an analog-to-digital converter 5, a Cortex-A8 processor 6, an Ethernet interface 7, a power management module 8, the single-supply fully differential amplifier 2 and the single-supply instrumentation amplifier 3 are communicatively connected and pass the signal through the single supply. The power instrumentation amplifier 3 performs amplification processing, 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 fully differential amplifier 2, and the single power supply fully differential The amplifier 2 is communicatively connected to the single-supply instrumentation amplifier 3, the single-supply instrumentation amplifier 3 is communicatively connected to the single-supply anti-aliasing filter 4, and the single-supply anti-aliasing filter 4 is electrically connected to the analog-to-digital converter 5, so The analog-to-digital converter 5 is electrically connected with the Cortex-A8 processor 6, the Cortex-A8 processor 6 is connected in communication with the Ethernet interface 7, and the power management module 8 is a BNC interface 1, a single power supply full differential amplifier 2 , single-supply instrumentation amplifier 3, single-supply anti-aliasing filter 4, analog-to-digital converter 5, Cortex-A8 processor 6 and Ethernet interface 7 power supply, power supply full differential amplifier circuit, full differential amplifier selection THS4521, rail Rail-to-rail output, 5V single power supply, 1.14mA working current, meeting system design requirements. The specific working mode and configuration refer to Figure 2. Single-supply instrumentation amplifier circuit, single-supply instrumentation amplifier select AD8422, AD8422 is a precision, low power, low noise rail-to-rail instrumentation amplifier. The AD8422 processes the signal with ultra-low distortion performance, and loading does not affect performance over the entire output range. Quiescent current is only 330µA maximum. Resistor R5 is used to configure the amplification factor of the instrumentation amplifier. This resistor can also be replaced by a coding resistor to achieve the function of controllable gain. Single-supply anti-aliasing filter circuit, using active filter design, 4th-order attenuation. The operational amplifier uses the AD8608 quad-channel, rail-to-rail input and output, single-supply amplifier, which features extremely low offset voltage, low input voltage and current noise, and wide signal bandwidth. These amplifiers use

Adjustment patented technology for excellent accuracy without laser adjustment. The analog-to-digital converter can use the ADS1278 to achieve 8-channel synchronous data acquisition.

Cortex-A8 processor requires a certain amount of calculation, choose AM3354 processor, up to 1GHz Sitara ARMCortex-A8 32-bit reduced instruction set computer (RISC) processor, NEON single instruction stream multiple data stream (SIMD) coprocessor, 32KB L1 Instruction and 32KB, data cache with unit error detection parity, 256KB L2 cache with error correction code (ECC), 176KB on-chip boot ROM, to meet the system's peripheral control and data processing requirements. At the same time, the ability to enter and exit control standby mode and deep sleep mode minimizes system power consumption. The main function of the single-power instrumentation amplifier circuit is to amplify the first-stage signal and improve the signal-to-noise ratio of the signal. Instrumentation amplifiers are also powered by a single supply. Because the common-mode voltage of the differential signal output by the fully differential amplifier is Vocm=2.5V, the common-mode voltage of the instrumentation amplifier is also set to 2.5V. The main function of the single-supply anti-aliasing filter circuit is to filter out interference and reduce noise. The design of the aliasing filter adopts a single-supply operational amplifier. Since the signal has been processed into a unipolar differential signal in the front-stage signal chain, and the common mode voltage is 2.5V, which is in the middle of the 5V power supply of the good signal chain, so this part The circuit only needs to choose a single-supply op amp. 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 mainly responsible for the logic control of the analog-to-digital converter and external data communication. The Ethernet interface is mainly responsible for sending the data packaged by 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 entire system.

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

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

Specifically, the single-supply anti-aliasing filter 4 filters unipolar signals.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integration; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be customized according to the description in the specification and the drawings, and the specific connection method of each part adopts the mature bolts, rivets and welding in the prior art. and other conventional means, the machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection manner in the prior art, which will not be described in detail here.

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

Claims (4)

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.

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