CN201517941U - Multi-channel input A/D converter - Google Patents
Multi-channel input A/D converter Download PDFInfo
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- CN201517941U CN201517941U CN2009202342366U CN200920234236U CN201517941U CN 201517941 U CN201517941 U CN 201517941U CN 2009202342366 U CN2009202342366 U CN 2009202342366U CN 200920234236 U CN200920234236 U CN 200920234236U CN 201517941 U CN201517941 U CN 201517941U
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- analog
- signal
- multichannel switch
- positive
- negative
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Abstract
The utility model relates to a multi-channel input A/D converter. Analogue multi-channel switches N1 and N2 respectively have more than two sensor positive and negative signal input terminals; the sensor positive and negative signal input terminals of the analogue multi-channel switch N1 are respectively connected with the sensor positive and negative signal input terminals of the analogue multi-channel switch N2; chopped wave analogue signal output terminals of the analogue multi-channel switches N1 and N2 are respectively connected with respective amplifying signal positive input terminals through operational amplifiers A1 and A2; the amplifying signal positive and negative input terminals of the analogue multi-channel switch N1 are respectively connected with the amplifying signal positive and negative input terminals of the analogue multi-channel switch N2; and the analogue multi-channel switches N1 and N2 respectively have a chopped wave amplifying signal output terminal connected with an A/D module, an analog channel control terminal connected with a load measuring selection terminal and a logic selection terminal of a microprocessor, and a chopped wave control terminal. The utility model can automatically switch and control more than two sensors and output signals with good precision and good stability.
Description
Technical field
The utility model relates to a kind of multi-channel input analog-to-digital converter, belongs to the weighing technology field.
Background technology
The control circuit of electronic-weighing equipment mainly is made of resistance bridge, amplifier, low-pass filter, A/D change-over circuit and CPU treatment circuit.In wheatstone bridge configuration, four brachium pontis of the general use of sensor, the differential signal of bridge circuit output is directly proportional with driving voltage, when sensor bears certain load, resistance strain gage impedance on the elastic body changes, gravimetric value is transformed into measurable simulating signal, because dependent variable is very little, need extra circuit to amplify impedance variation, the simulating signal of passing through is amplified through amplifying circuit, low-pass filtering, convert analog electrical signal to digital signal by the A/D change-over circuit and deliver to the CPU treatment circuit and carry out data processing, at last the data of handling are connected demonstration by its serial ports with external unit and export.But in practice, weighing system needs a plurality of weighing platforms, and a plurality of sensors that are installed on a plurality of weighing platforms are to be connected on the indicator, and operating personnel need Push switch to switch conversion between a plurality of weighing platforms, not only precision is not high, and operates loaded down with trivial details.
Summary of the invention
It is a kind of in weighing process that the purpose of this utility model provides, can be to the control of automaticallying switch between the plural sensor, output signal accuracy height, the multi-channel input analog-to-digital converter of good stability.
The utility model is that the technical scheme that achieves the above object is: a kind of multi-channel input analog-to-digital converter, it is characterized in that: comprise the first analog multichannel switch N1 and the second analog multichannel switch N2, first operational amplifier A 1 and second operational amplifier A 2, the described first analog multichannel switch N1 and the second analog multichannel switch N2 all have plural sensor positive signal input end and sensor negative signal input end, and the sensor positive signal input end of the first analog multichannel switch N1 is connected with sensor negative signal input end with the sensor positive signal input end of the second analog multichannel switch N2 respectively with sensor negative signal input end; The copped wave analog signal output of the first analog multichannel switch N1 is through the amplifying signal positive input terminal of the positive input termination first analog multichannel switch N1 of first operational amplifier A 1, the copped wave analog signal output of the second analog multichannel switch N2 connects the amplifying signal negative input end of the second analog multichannel switch N2 through the positive input of second operational amplifier A 2, and the amplifying signal positive input terminal of the first analog multichannel switch N1 is connected with the amplifying signal negative input end with the amplifying signal positive input terminal of the second analog multichannel switch N2 respectively with the amplifying signal negative input end; The first analog multichannel switch N1 and the second analog multichannel switch N2 all have and the analog channel control end and the copped wave control end that connect copped wave amplifying signal output terminal that the A/D module is connected, be connected with the logic selecting side with the load measurement selecting side of microprocessor.
Wherein: first operational amplifier A 1 and second operational amplifier A 2, resistance R 40, R41, R44 and capacitor C 12, C13 constitute differential amplifier circuit, the parallel branch of resistance R 40 and capacitor C 12 is connected between the negative input and output terminal of first operational amplifier A 1, the parallel branch of resistance R 41 and capacitor C 13 is connected between the negative input and output terminal of second operational amplifier A 2, and resistance R 44 is connected on the negative input of first operational amplifier A 1 and the negative input of second operational amplifier A 2.
Multi-channel input analog-to-digital converter of the present utility model adopts the analog multichannel switch with the positive and negative signal input part of a plurality of sensors, the positive negative signal of sensor that receives plural sensor by two analog multichannel switches, and under microprocessor control, can automatically switch to the positive negative signal of the sensor of each sensor automatically, simultaneously by microprocessor to selecting automatically between the sensor and switch, therefore can realize that a pair of analog multichannel switch comes the simulating signal of a plurality of passages is measured.The utility model amplifies by the copped wave of analog multichannel switch and has compensated for most because the drift that temperature variation causes effectively, therefore the output quantity of survey sensor accurately, its environment temperature is from-10 ℃ to 40 ° in the C scope, and sensor also can reach ten and spend very much and keep stable when the 10mV input voltage.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Fig. 1 is an electrical schematic diagram of the present utility model.
Embodiment
Multi-channel input analog-to-digital converter of the present utility model comprises the first analog multichannel switch N1 and the second analog multichannel switch N2, amplifying circuit A1 and A2.See shown in Figure 1, the first analog multichannel switch N1 of the present utility model and the second analog multichannel switch N2 all have plural sensor positive signal input end and sensor negative signal input end, four brachium pontis of the general use of this sensor, the differential signal that bridge circuit can be exported is directly proportional with driving voltage, the first analog multichannel switch N1 of the present utility model and the second analog multichannel switch N2 are two functions, the integrated chip that model is identical, as the CD4052 chip, the sensor positive signal input end of the first analog multichannel switch N1 is connected with sensor negative signal input end with the sensor positive signal input end of the second analog multichannel switch N2 respectively with sensor negative signal input end, by a plurality of input ends on two analog multichannel switches, be connected with the positive negative signal of the sensor of a plurality of weighing platforms, and can not increase the cost of weighing system.
See shown in Figure 1, the copped wave analog signal output of the first analog multichannel switch N1 of the present utility model is through the amplifying signal positive input terminal of the positive input termination first analog multichannel switch N1 of first operational amplifier A 1, the copped wave analog signal output of the second analog multichannel switch N2 connects the amplifying signal negative input end of the second analog multichannel switch N2 through the positive input of second operational amplifier A 2, the amplifying signal positive input terminal of this first analog multichannel switch N1 is connected with the amplifying signal negative input end with the amplifying signal positive input terminal of the second analog multichannel switch N2 respectively with the amplifying signal negative input end, the first analog multichannel switch N1 all has with the second analog multichannel switch N2 and connects the copped wave amplifying signal output terminal that A/D module 3 is connected, the analog channel control end and the copped wave control end that are connected with the logic selecting side with the load measurement selecting side of microprocessor 4, the copped wave amplifying signal output terminal of the first analog multichannel switch N1 connects microprocessor 4 signal input parts through A/D module 3, the copped wave amplifying signal output terminal of the second analog multichannel switch N2 connects microprocessor 4 signal input parts through A/D module 3, and the load measurement selecting side of microprocessor 4 is connected with the copped wave control end with the analog channel control end of the first analog multichannel switch N1 and the second analog multichannel switch N2 respectively with the logic selecting side, select the positive negative signal of sensor of different sensors by two analog multichannel switches of microprocessor 4 controls, and copped wave constantly, signal amplifies through amplifier to the negative sense switching from the forward of circuit, switch back original phase place again, compensated for majority effectively owing to the drift that temperature variation causes, reached high-precision signal and amplify.It is the multi-functional integrated chip of one that A/D module 3 of the present utility model can adopt A/D conversion and digital filtering, as is adopted as the integrated chip of AD5532, AD7641 or AD7760, and microprocessor 4 can adopt LPC2129 or LPC2119 chip.
See shown in Figure 1, first operational amplifier A 1 of the present utility model and second operational amplifier A 2, resistance R 40, R41, R44 and capacitor C 12, C13 constitute differential amplifier circuit, the parallel branch of resistance R 40 and capacitor C 12 is connected between the negative input and output terminal of first operational amplifier A 1, the parallel branch of resistance R 41 and capacitor C 13 is connected between the negative input and output terminal of second operational amplifier A 2, and resistance R 44 is connected between the negative input of the negative input of first operational amplifier A 1 and second operational amplifier A 2.
See shown in Figure 1ly, when adopting two scale bodies in the weighing system of the present utility model, favour Stone circuit on the scale body 1 and another favour Stone circuit on the scale body 2 are received respectively on the first analog multichannel switch N1 and the second analog multichannel switch N2.Claim on the sensor positive signal input end Y1 of sensor positive signal input end X0 that the sensor positive signal of body 1 is connected to the first analog multichannel switch N1 and second analog multichannel switch N2 that the sensor negative signal of scale body 1 is connected on the sensor negative signal input end Y0 of the sensor negative signal input end X1 of the first analog multichannel switch N1 and the second analog multichannel switch N2.Equally, claim on the sensor positive signal input end Y3 of the sensor positive signal input end X2 that the sensor positive signal of body 2 is connected to the first analog multichannel switch N1 and the second analog multichannel switch N2, the sensor negative signal of scale body 2 is connected on the sensor negative signal input end Y2 of the sensor negative signal input end X3 of the first analog multichannel switch N1 and the second analog multichannel switch N2, and the copped wave analog signal output Y of the copped wave analog signal output X of the first analog multichannel switch N1 and second analog multichannel switch N2 is connected to the positive input terminal of amplifier A1 and amplifier A2 respectively; The amplifying signal positive input terminal X01 of the output terminal of amplifier A1 and analog multichannel switch N1, the amplifying signal positive input terminal Y11 of X21 and analog multichannel switch N2, Y31 links to each other, the amplifying signal negative input end X11 of the output terminal of amplifier A2 and analog multichannel switch N1, the amplifying signal negative input end Y01 of X31 and analog multichannel switch N2, Y21 links to each other, the load measurement of microprocessor 4 is selected the analog channel control end Z2 of termination first analog multichannel switch and the analog channel control end Z2 of the second analog multichannel switch N2, and the logic of microprocessor 4 selects the copped wave control end Z1 of termination first analog multichannel switch and the copped wave control end Z1 of second analog multichannel switch to be connected.
Table 1 is that microprocessor 4 load measurements are selected and positive and negative signal value output is simulated in two analog multichannel switch N1 of logic selection signal state and the copped wave of N2,
Table 1
| Z1 | Z2 | X | Y |
| 0 | 0 | X0 | Y0 |
| 0 | 1 | X1 | Y1 |
| 1 | 0 | X2 | Y2 |
| 1 | 1 | X3 | Y3 |
As can be seen from Table 1, when analog channel control end Z2=0, analog multichannel switch selects to claim the positive negative signal input of sensor of body 1, and copped wave control end Z1 carries out the switching signal of copped wave to and fro from the forward to the negative sense, and positive negative signal X and Y are connected to two analog multichannel switches once more after first operational amplifier A 1 and second operational amplifier A 2 are amplified amplifying signal positive-negative input end is simulated in copped wave, again through the copped wave amplifying signal output terminal Xout and the Yout output signal of two analog multichannel switches, compensated for the drift that majority causes owing to temperature variation effectively, high-precision signal inputs in the microprocessor 4, read and analyze for microprocessor 4, judge, 4 of microprocessors are handled data, by its serial ports and upper machine communication, finish the work of weighing.The utility model can switch by the signal of two analog multichannel switches to a plurality of sensors, and the signal of output high precision and good stability.
Claims (2)
1. multi-channel input analog-to-digital converter, it is characterized in that: comprise the first analog multichannel switch N1 and the second analog multichannel switch N2, first operational amplifier A 1 and second operational amplifier A 2, the described first analog multichannel switch N1 and the second analog multichannel switch N2 all have plural sensor positive signal input end and sensor negative signal input end, and the sensor positive signal input end of the first analog multichannel switch N1 is connected with sensor negative signal input end with the sensor positive signal input end of the second analog multichannel switch N2 respectively with sensor negative signal input end; The copped wave analog signal output of the first analog multichannel switch N1 is through the amplifying signal positive input terminal of the positive input termination first analog multichannel switch N1 of first operational amplifier A 1, the copped wave analog signal output of the second analog multichannel switch N2 connects the amplifying signal negative input end of the second analog multichannel switch N2 through the positive input of second operational amplifier A 2, and the amplifying signal positive input terminal of the first analog multichannel switch N1 is connected with the amplifying signal negative input end with the amplifying signal positive input terminal of the second analog multichannel switch N2 respectively with the amplifying signal negative input end; The first analog multichannel switch N1 and the second analog multichannel switch N2 all have and the analog channel control end and the copped wave control end that connect copped wave amplifying signal output terminal that the A/D module is connected, be connected with the logic selecting side with the load measurement selecting side of microprocessor.
2. multi-channel input analog-to-digital converter according to claim 1, it is characterized in that: first operational amplifier A 1 and second operational amplifier A 2, resistance R 40, R41, R44 and capacitor C 12, C13 constitutes differential amplifier circuit, the parallel branch of resistance R 40 and capacitor C 12 is connected between the negative input and output terminal of first operational amplifier A 1, the parallel branch of resistance R 41 and capacitor C 13 is connected between the negative input and output terminal of second operational amplifier A 2, and resistance R 44 is connected between the negative input of the negative input of first operational amplifier A 1 and second operational amplifier A 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202342366U CN201517941U (en) | 2009-08-13 | 2009-08-13 | Multi-channel input A/D converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202342366U CN201517941U (en) | 2009-08-13 | 2009-08-13 | Multi-channel input A/D converter |
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| Publication Number | Publication Date |
|---|---|
| CN201517941U true CN201517941U (en) | 2010-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202342366U Expired - Lifetime CN201517941U (en) | 2009-08-13 | 2009-08-13 | Multi-channel input A/D converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101626241B (en) * | 2009-08-13 | 2012-10-10 | 奥豪斯仪器（上海）有限公司 | Multi-channel input analog-to-digital converter |
| CN105444860A (en) * | 2015-11-21 | 2016-03-30 | 马俊 | Four channel measurement electronic scale and measurement method |
| CN113899437A (en) * | 2021-09-29 | 2022-01-07 | 中航电测仪器(西安)有限公司 | Analog signal sampling and measuring circuit and method based on weighing sensor |
-
2009
- 2009-08-13 CN CN2009202342366U patent/CN201517941U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101626241B (en) * | 2009-08-13 | 2012-10-10 | 奥豪斯仪器（上海）有限公司 | Multi-channel input analog-to-digital converter |
| CN105444860A (en) * | 2015-11-21 | 2016-03-30 | 马俊 | Four channel measurement electronic scale and measurement method |
| CN105444860B (en) * | 2015-11-21 | 2018-04-24 | 马俊 | A kind of measuring method of four-way electronic scale |
| CN113899437A (en) * | 2021-09-29 | 2022-01-07 | 中航电测仪器(西安)有限公司 | Analog signal sampling and measuring circuit and method based on weighing sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100630 Effective date of abandoning: 20090813 |
|
| RGAV | Abandon patent right to avoid regrant |