CN203642941U - Multipath sensing single-channel constant current measuring device - Google Patents

Multipath sensing single-channel constant current measuring device Download PDF

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Publication number
CN203642941U
CN203642941U CN201320837175.9U CN201320837175U CN203642941U CN 203642941 U CN203642941 U CN 203642941U CN 201320837175 U CN201320837175 U CN 201320837175U CN 203642941 U CN203642941 U CN 203642941U
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China
Prior art keywords
circuit
constant current
selection circuit
measuring device
single channel
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CN201320837175.9U
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Chinese (zh)
Inventor
张伟
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JIANGXI TELLHOW MILITARY INDUSTRY GROUP CO., LTD.
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JIANGXI QINGHUA TAIHAO MICRO MOTOR Co Ltd
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Abstract

The utility model provides a multipath sensing single-channel constant current measuring device. The measuring device comprises a plurality of differential amplification circuits, a simulation selection circuit, a constant current filter circuit and a variable gain amplification circuit. Each sensing signal is connected with one differential amplification circuit. The sensing signal is subjected to differential amplification and then the signal goes into the simulation selection circuit. The AD converter of the simulation selection circuit is in multichannel input and single-channel output. The simulation selection circuit is connected with the constant current filter circuit. The sensing signal after constant current filter goes into an AD sampling chip through the variable gain amplification circuit and sampling measurement is carried out. The measuring device has advantages of strong adaptability and stable and reliable circuit, can be applied to multipath sensing signals at the same time, can reduce scale of a sensing measurement hardware circuit, lowers component cost, and raises flexibility of test hardware.

Description

A kind of multichannel sensing single channel constant current measurement mechanism
Technical field
The utility model belongs to transducing signal field, is specifically related to a kind of multichannel sensing single channel constant current measurement mechanism.
Background technology
The measurement of transducing signal is main points and the difficult point in signal measurement often.Must be converted into the electrical quantity signal that resistance etc. can be measured by sensor in the physical quantity such as probe temperature, pressure just can measure.Be the voltage signal of 0-3.3V but because resistance sizes and the resolving accuracy of the conversion of different sensing devices are not identical, every road signal all must carry out by the excitation of constant current source and by transforming, conditioning can receive for chip.In this manner, need to be current source of each Path Setup and modulate circuit, not only increase device cost, and can cause sensing resistor for a long time in "on" position, be unfavorable for the long-term stable operation of circuit, and increase system power dissipation.
Utility model content
The purpose of this utility model is to provide a kind of by analog switch, with single channel conditioning and measurement passage, measures the constant current measurement mechanism of multichannel transducing signal.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of multichannel sensing single channel constant current measurement mechanism, comprise some groups of differential amplifier circuits, analog selection circuit, constant current filtering circuit, variable-gain amplification circuit, it is characterized in that: one group of differential amplifier circuit of the each connection of each road transducing signal, transducing signal enters analog selection circuit after differential amplification, the AD converter of described analog selection circuit is the output of hyperchannel input single channel, analog selection circuit connects constant current filtering circuit, and the filtered transducing signal of constant current enters AD sampling A/D chip through variable-gain amplification circuit and carries out sampled measurements.
Described differential amplifier circuit is two differential amplifier circuits.
Described AD converter is MAX4581 converter.
Variable gain amplifier in described variable-gain amplification circuit is PGA204.
Technique effect of the present utility model is:
1, strong adaptability, circuit is reliable and stable, can be applied to multichannel transducing signal simultaneously; 2, can reduce the scale of sensing measurement hardware circuit, reduce device cost, increase the dirigibility of testing hardware.If 3 when enter without transducing signal, the utility model device can be ended energising, reduces the power consumption of device, has extended the serviceable life of device.
Accompanying drawing explanation
Fig. 1 is differential amplifier circuit of the present utility model;
Fig. 2 is analog selection circuit of the present utility model;
Fig. 3 is constant current filtering circuit of the present utility model;
Fig. 4 is variable-gain amplification circuit of the present utility model.
Accompanying drawing explanation: 1, AD converter 2, variable gain amplifier 3, AD sampling A/D chip.
Embodiment
Below by accompanying drawing, the utility model is described further.
A kind of multichannel sensing single channel constant current measurement mechanism, comprise some groups of differential amplifier circuits, analog selection circuit, constant current filtering circuit, variable-gain amplification circuit, it is characterized in that: one group of differential amplifier circuit of the each connection of each road transducing signal, transducing signal enters analog selection circuit after differential amplification, the AD converter 1 of described analog selection circuit 2 is the output of hyperchannel input single channel, analog selection circuit connects constant current filtering circuit, and the filtered transducing signal of constant current enters AD sampling A/D chip 3 through variable-gain amplification circuit and carries out sampled measurements.
Described differential amplifier circuit is two differential amplifier circuits.
Described AD converter 1 is MAX4581 converter.
Variable gain amplifier 2 in described variable-gain amplification circuit is PGA204.
Differential amplifier circuit as shown in Figure 1, voltage reference is introduced the positive input terminal of amplifier J1 by R1, and J1 and J2 form constant-current device, and the signal of voltage reference forms steady current by constant-current device between AB point.Sensor is connected between 1, No. 2 terminal of J6, and current limit produces at A point the voltage signal matching with resistance after by resistance, and by being designated AD-1 for late-class circuit after the resistance R 12 connecting.When there being multichannel transducing signal to be greater than, repeat circuit shown in Fig. 1, be designated AD-2, AD-3......AD-X (X is not more than 8), be connected with the circuit of next stage.
Analog selection circuit as shown in Figure 2, transducing signal is after nursing one's health into the plurality of voltages such as AD-1, AD-2 signal, and access analog selection circuit, on the basis of an AD passage of application, guarantees the measurement to multichannel transducing signal.Circuit after conditioning access IC1(AD converter 1) the pins such as 14,15, by the effect of IC1, switch analog channel with taking turns the mode turning, in the time not carrying out lane testing, No. 13 pins that analog channel is selected IC1, carry out error school zero, are then connected with the circuit of next stage.
Constant current filtering circuit as shown in Figure 3, the signal of selection is through No. 3 point outputs of IC1, and the voltage-controlled filtering circuit of second order forming by entering J3 after R2, carries out 10Hz low-pass filtering to front segment signal, after filtering completes, through R5 output, is connected with the circuit of next stage.
Variable-gain amplification circuit as shown in Figure 4, the voltage signal of conditioning is because the difference of front end sensing resistor may differ larger after filtering, input now may be 100mV-2V, signal condition must be arrived by the mode of amplifying the electric pressure of 2V-2.5V in rear end, processes for AD sampling A/D chip 3.Due to the difference of input range, need to carry out signal amplification by the adjusting of gain amplifier.IC2 is variable gain amplifier 2, and signal is from No. 5 point accesses of IC2, and 15, No. 16 points of IC2 are gain-adjusted control end, by changing this data of 2, change the output magnification ratio that IC211 is ordered.Data after amplification are introduced AD sampling A/D chip 3 after J4 next stage differential amplification.

Claims (4)

1. a multichannel sensing single channel constant current measurement mechanism, comprise some groups of differential amplifier circuits, analog selection circuit, constant current filtering circuit, variable-gain amplification circuit, it is characterized in that: one group of differential amplifier circuit of the each connection of each road transducing signal, transducing signal enters analog selection circuit after differential amplification, the AD converter of described analog selection circuit is the output of hyperchannel input single channel, analog selection circuit connects constant current filtering circuit, and the filtered transducing signal of constant current enters AD sampling A/D chip through variable-gain amplification circuit and carries out sampled measurements.
2. a kind of multichannel sensing single channel constant current measurement mechanism according to claim 1, is characterized in that: described differential amplifier circuit is two differential amplifier circuits.
3. a kind of multichannel sensing single channel constant current measurement mechanism according to claim 1, is characterized in that: described AD converter is MAX4581 converter.
4. a kind of multichannel sensing single channel constant current measurement mechanism according to claim 1, is characterized in that: the variable gain amplifier in described variable-gain amplification circuit is PGA204.
CN201320837175.9U 2013-12-18 2013-12-18 Multipath sensing single-channel constant current measuring device Active CN203642941U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320837175.9U CN203642941U (en) 2013-12-18 2013-12-18 Multipath sensing single-channel constant current measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320837175.9U CN203642941U (en) 2013-12-18 2013-12-18 Multipath sensing single-channel constant current measuring device

Publications (1)

Publication Number Publication Date
CN203642941U true CN203642941U (en) 2014-06-11

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CN201320837175.9U Active CN203642941U (en) 2013-12-18 2013-12-18 Multipath sensing single-channel constant current measuring device

Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103675385A (en) * 2013-12-18 2014-03-26 江西清华泰豪微电机有限公司 Multi-channel sensing single-channel constant current measuring device
CN107273973A (en) * 2015-10-23 2017-10-20 株式会社半导体能源研究所 Semiconductor device and electronic equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103675385A (en) * 2013-12-18 2014-03-26 江西清华泰豪微电机有限公司 Multi-channel sensing single-channel constant current measuring device
CN107273973A (en) * 2015-10-23 2017-10-20 株式会社半导体能源研究所 Semiconductor device and electronic equipment
US10922605B2 (en) 2015-10-23 2021-02-16 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device and electronic device

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Address after: 330096, B building, building 591, hi tech Avenue, Nanchang hi tech Zone, Jiangxi

Patentee after: JIANGXI TELLHOW MILITARY INDUSTRY GROUP CO., LTD.

Address before: 330096, B building, building 591, hi tech Avenue, Nanchang hi tech Zone, Jiangxi

Patentee before: JIANGXI QINGHUA TAIHAO MICRO MOTOR CO., LTD.