CN203204008U

CN203204008U - Rotation speed measuring board card based on PXI bus

Info

Publication number: CN203204008U
Application number: CN 201320186667
Authority: CN
Inventors: 贺惠农; 鲁佳
Original assignee: HANGZHOU VICON TECHNOLOGY Co Ltd
Current assignee: HANGZHOU VICON TECHNOLOGY Co Ltd
Priority date: 2013-04-12
Filing date: 2013-04-12
Publication date: 2013-09-18
Anticipated expiration: 2023-04-12

Abstract

The utility model relates to a rotation speed measuring device, especially a rotation speed measuring board card based on PXI bus. A communication module is connected with an FPGA module; and output terminal of a signal conditioning module and an input terminal of a power supply module are respectively connected with the FPGA module; the signal conditioning module includes a protection filtering module and a level processing module; an output terminal of the protection filter module is connected with an input terminal of the level processing module; and an output terminal of the level processing module is connected with the FPGA module. The above structure is convenient and accurate for measuring rotation speed, and has good reliability and strong real-time performance; and voltage selection circuit is designed to provide working voltage for various types of sensors; for the signal acquisition and processing, voltage protection is designed to effectively prevent damage caused by abnormal working of the the device and the sensor; the FPGA module is used as the control chip to realize efficient and accurate signal processing; and the PXI bus communicates with a computer to conduct online analysis, and improve the real-time performance and the reliability of the product.

Description

Tachometric survey integrated circuit board based on the PXI bus

Technical field

The utility model relates to a kind of rotation-speed measuring device, especially a kind of tachometric survey integrated circuit board based on the PXI bus.

Background technology

Tachometric survey is widely applied in observation and control technology, and the grasp by rotary speed information makes relevant control information more quick, accurately.Along with the widespread use of PXI bussing technique in test, fields of measurement, many PXI modules and system are developed to satisfy the demand of different user simultaneously.Measuring technique has strict demand to environment, reliability, processing speed and precision.

Aspect tachometric survey, the rotation-speed measuring device major part on the market is to process acquisition by single-chip microcomputer, does not obviously reach high-precision requirement at present.Also only be the rotating speed that has obtained measured body simultaneously, do not carry out on-line analysis and judge whether measured body unusual condition occurs, and real-time is not strong.

Summary of the invention

The purpose of this utility model is, provide a kind of real-time, error is little, reliably based on the tachometric survey integrated circuit board of PXI bus.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of tachometric survey integrated circuit board based on the PXI bus; comprise the communication module that is connected for outside PXI bus; the FPGA module; the signal condition module; supply module; communication module is connected with the FPGA module; the output terminal of signal condition module is connected with the FPGA module respectively with the input end of supply module; the signal condition module comprises the protection filtration module; the level processing module; the output terminal of protection filtration module is connected with the input end of level processing module, and the output terminal of level processing module is connected with the FPGA module.

Of the present utility modelly further be set to: described protection filtration module comprises RC filtering circuit, comparer, two resistor voltage divider circuit, RC filtering circuit, comparer, the series connection of two resistor voltage divider circuit.

Of the present utility modelly further be set to: described level processing module is the serial Feedback formula mu balanced circuit that two triodes consist of.

Of the present utility modelly further be set to: described supply module is the voltage selecting circuit that comprises MAX1771 power supply chip and three triodes.

Said structure measures that rotating speed is convenient accurately, good reliability, real-time demand; the digital speed probe that can mate a few class main flows on the market; and designed voltage selecting circuit; for various kinds of sensors provides operating voltage; in signals collecting, processing procedure; designed voltage protection, prevented that effectively device and sensor from damaging because of operation irregularity.Adopt the FPGA module as control chip, signal is processed more efficient, accurate.Utilize PXI bus and computer communication, carry out on-line analysis, improve real-time, improved greatly the reliability of product.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the theory diagram of utility model;

Fig. 2 is the circuit diagram of protection filtration module;

Fig. 3 is the circuit diagram of serial Feedback formula mu balanced circuit;

Fig. 4 is the circuit picture group of MAX1771 power supply chip in the voltage selecting circuit;

Fig. 5 is the connecting circuit figure of three triodes in the voltage selecting circuit;

Embodiment

With reference to figure 1 as can be known; a kind of tachometric survey integrated circuit board based on the PXI bus of the utility model; comprise the communication module, FPGA module, signal condition module, the supply module that are connected for outside PXI bus; communication module is connected with the FPGA module; the output terminal of signal condition module is connected with the FPGA module respectively with the input end of supply module; the signal condition module comprises protection filtration module, level processing module; the output terminal of protection filtration module is connected with the input end of level processing module, and the output terminal of level processing module is connected with the FPGA module.

With reference to figure 2 as can be known, capacitor C 101 is connected on the negative pole of comparer OPA2140, the RC filtering circuit that R100 and C102 consist of is connected on the positive pole of comparer OPA2140, in the diode D100 access RC filtering circuit, the output terminal of comparer OPA2140 is connected with two resistor voltage divider circuits that resistance R 101, R102 consist of.

At first prevent overvoltage protection behind the signals of rotational speed sensor Sig_1 access to plant, the D100 docking port carries out+the 24V overvoltage protection, and D100 adopts the 1N4148 protection tube.Because signals of rotational speed sensor may contain interference component, therefore signal is carried out filtering, the RC filtering circuit that is made of R100 and C102 removes the interference component in the signal.After the signal filtering, carry out voltage ratio by comparer again, signals of rotational speed sensor is generally square-wave signal, the high level voltage amplitude range is generally+5V～+ 24V, so carry out voltage ratio in, relatively threshold value setting is+2.5V.Comparer adopts OPA2140, and supply voltage is+24V.Output signal be+square-wave signal of 24V relatively, then utilizes two resistor voltage divider circuits of resistance R 101 and R102 formation to carry out dividing potential drop, obtains signal Sig_1F, and this signal is that voltage magnitude is the square-wave signal of 3V.

With reference to figure 3 as can be known, serial Feedback formula mu balanced circuit is connected and composed by capacitor C 108, resistance R 106, resistance R 107, resistance R 108, resistance R 109, triode Q1, triode Q101.

Because the signal voltage potentially unstable of comparer output is directly inputted in the FPGA module and may causes damage to FPGA, so design a serial Feedback formula mu balanced circuit, this main circuit will be made of two triodes, and triode adopts 9013.Signal Sig_1F obtains signal Sig1 through after this processing of circuit, and the Sig1 signal also is square-wave signal, and frequency is identical with Sig_1F, and amplitude is 3.3V, and in the FPGA module of again signal Sig1 being made a gift to someone, FPGA counts it can obtain rotary speed information.

With reference to figure 4, Fig. 5 as can be known, the circuit of the MAX1771 power supply chip of the capacitor C 402 of MAX1771 power supply chip and periphery, capacitor C 403, capacitor C 404, inductance L 400, resistance R 400, resistance R 401, resistance R 410, diode D400 and field effect transistor Q400 formation; Triode Q402 contact resistance R404, resistance R 405, triode Q403 contact resistance R406, resistance R 407, triode Q404 contact resistance R408,409, three circuit parallel connections of resistance R, and connect and compose voltage selecting circuit with the circuit of MAX1771 power supply chip.

Speed probe generally all needs externally fed to work, and has designed the voltage selecting circuit for the sensor power supply in this device.Adopting the MAX1771 power supply chip to carry out voltage selects; the value that this chip is controlled output voltage+Vrev by peripheral resistance R 401 and the Choice ratio of FB pin; the power supply voltage range of sensor+5V～+ 24V in; supply voltage is+5V; + 12V; + 24V; these three kinds of supply voltages can satisfy most speed probes; control signal+5VCTR that the size of resistance value Choice is sent by FPGA; + 12VCTR; + 24VCTR and triode are controlled; so just can make output voltage+Vrev at+5V; + 12V; select between+24V the three; carry out current-limiting protection at the output port place can also for simultaneously external sensor supply voltage+Vrev; avoid burning out sensor because electric current is excessive in the operation irregularity situation, the current limit maximum is output as 120mA.

Circuit form in the utility model can change, and the disclosed just a kind of physical circuit form of optimum wherein of the present embodiment also can be substituted by the identical circuit of other functions.

Obviously, above-described embodiment only be for explanation clearly do for example, and be not restriction to embodiment.To those of ordinary skill in the art, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are in the protection domain of the present utility model.

Claims

1. tachometric survey integrated circuit board based on the PXI bus; it is characterized in that: comprise the communication module, FPGA module, signal condition module, the supply module that are connected for outside PXI bus; communication module is connected with the FPGA module; the output terminal of signal condition module is connected with the FPGA module respectively with the input end of supply module; the signal condition module comprises protection filtration module, level processing module; the output terminal of protection filtration module is connected with the input end of level processing module, and the output terminal of level processing module is connected with the FPGA module.

2. according to the tachometric survey integrated circuit board based on the PXI bus claimed in claim 1, it is characterized in that: described protection filtration module comprises RC filtering circuit, comparer, two resistor voltage divider circuit, RC filtering circuit, comparer, the series connection of two resistor voltage divider circuit.

3. according to the tachometric survey integrated circuit board based on the PXI bus claimed in claim 2, it is characterized in that: described level processing module is the serial Feedback formula mu balanced circuit that two triodes consist of.

4. according to claim 1 or 2 or 3 described tachometric survey integrated circuit boards based on the PXI bus, it is characterized in that: described supply module is the voltage selecting circuit that comprises MAX1771 power supply chip and three triodes.