CN213904093U - Signal acquisition circuit of wide voltage range input - Google Patents
Signal acquisition circuit of wide voltage range input Download PDFInfo
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- CN213904093U CN213904093U CN202022166326.5U CN202022166326U CN213904093U CN 213904093 U CN213904093 U CN 213904093U CN 202022166326 U CN202022166326 U CN 202022166326U CN 213904093 U CN213904093 U CN 213904093U
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- voltage range
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Abstract
The utility model relates to a signal acquisition circuit of wide voltage range input, including dial switch SW1, double-circuit amplifier, analog switch and gain control chip, its characterized in that, adopts the form that resistance partial pressure, conditioning circuit and analog switch combine together to enlarge the voltage acquisition scope, conditioning circuit uses the fortune to put and constitutes the following circuit; the resistors are respectively arranged between the dial switch SW1 and the dual-path amplifier, between the dual-path amplifier and the analog switch, between the analog switch and the gain control chip, and the output end of the gain control chip is used for voltage division; the gain control chip is connected with the AD acquisition chip to acquire analog signals. The voltage range of the circuit is expanded from +/-10V to +/-7.5V, + -15V, + -30V, + -60V and +/-100V, and the conditioning circuit is improved. The utility model discloses it is high to have effectively solved to wait to gather in the same system voltage, and the requirement of the complicated and equipment miniaturization of system solves the interior pain point problem of industry, reduces the project cost.
Description
Technical Field
The utility model belongs to the technical field of computer bus analog quantity gathers, concretely relates to signal acquisition circuit of wide voltage range input.
Background
At present, based on computer buses such as CPCI/PCI/ISA/PCIE/PXIE and the like, the voltage range of an analog quantity acquisition module is mostly concentrated between-10V and 10V, and the requirement for large voltage measurement cannot be met. If a large voltage needs to be measured, a conditioning plate needs to be connected externally, signals are conditioned and then collected, engineering practice difficulty is increased, and integration is difficult.
A small number of analog quantity input modules with wide voltage ranges exist in the market, most of the analog quantity input modules adopt a resistor voltage division circuit to perform voltage division processing, and the analog quantity input modules are sent to an analog-to-digital conversion chip to be collected through an analog switch switching circuit, so that the voltage ranges are fixed, and channels are easy to interfere with each other.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problem, providing a signal acquisition circuit of wide voltage range input, effectively solving same system, waiting to acquire voltage high, the requirement that system complicacy and equipment require the miniaturization solves the interior pain point problem of industry, reduces the project cost.
In order to achieve the above object, the utility model provides a following technical scheme:
a signal acquisition circuit with wide voltage range input comprises a dial switch SW1, a two-way amplifier, an analog switch and a gain control chip, and is characterized in that the voltage acquisition range is expanded by combining a resistance voltage division circuit, a conditioning circuit and the analog switch, and the conditioning circuit uses an operational amplifier to form a following circuit; the resistors are respectively arranged between the dial switch SW1 and the dual-path amplifier, between the dual-path amplifier and the analog switch, between the analog switch and the gain control chip, and the output end of the gain control chip is used for voltage division; the gain control chip is connected with the AD acquisition chip to acquire analog signals.
Further, the voltage range of the circuit is expanded from-10V to + -7.5V, + -15V, + -30V, + -60V and + -100V, and the conditioning circuit is improved.
Preferably, the gain control chip adopts AD8251 ARMZ.
Preferably, the analog switch is ADG1206 YRUZ.
Preferably, the AD capture chip employs ADs 8411.
Preferably, the resistors are 8 groups.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model provides a standard bus board card on limited area, realize enlarging the problem that the analog quantity gathered the input voltage scope. By adopting a circuit mode of resistor voltage division, dial switch selection, operational amplifier follower circuit, signal selection and conditioning, the analog input voltage range is increased to 100VDC, the sampling rate of the board card is not influenced, and crosstalk is not generated among channels.
Due to the increase of the measurement range, the problems of high voltage to be acquired, complex system and miniaturization requirement of equipment in the same system are effectively solved, the problem of pain points in the industry is solved, and the project cost is reduced.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required to be used in the description of the embodiment will be briefly introduced below, it is obvious that the drawings in the following description are only for more clearly illustrating the embodiment of the present invention or the technical solution in the prior art, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a circuit diagram of an analog signal acquisition circuit in the prior art;
fig. 2 is the circuit diagram of the analog signal acquisition of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described with reference to the following specific embodiments, which are provided as illustration only and are not intended to limit the present invention.
A wide voltage range input signal acquisition circuit as shown in FIG. 2 extends the voltage range from-10V to 7.5V, 15V, 30V, 60V and 100V and improves the conditioning circuit to minimize inter-channel interference. The specific principle is shown in fig. 2.
When the input range is +/-7.5V, the switch is closed to SW1 (the access port of the dial switch-switch key), and AI0 is subjected to voltage division by R1(100 Komega) and R4(20K) and then is input into an AIN _0 rear-stage conditioning circuit;
when the input range is +/-15V, the switch is closed, and AI0 is subjected to voltage division by R1(100K omega) and R4(20K) and then is input into an AIN _0 post-stage conditioning circuit;
when the input range is +/-30V, the switch is closed, and AI0 is subjected to voltage division by R1(100K omega) and R4(20K) and then is input into an AIN _0 post-stage conditioning circuit;
when the input range is +/-60V, the switch is closed, and AI0 is subjected to voltage division by R1(100K omega) and R4(20K) and then is input into an AIN _0 post-stage conditioning circuit;
when the input range is +/-100V, the switch is turned off, and AI0 is divided by R1(100K omega), R2, R3 and R4(20K) and then input into the AIN _0 post-stage conditioning circuit.
The following table 1 is a position table of the dial switch corresponding to the measuring range.
TABLE 1 RANGE-CORRESPONDING PULL SWITCH POSITION METER
The rear-stage conditioning circuit uses an operational amplifier to form a following circuit, so that the input impedance is improved, and the problem of inter-channel crosstalk caused by switching of a rear-stage analog switch is solved.
After the following circuit, the signal is switched by an analog switch (ADG1206YRuz), conditioned by a gain control chip (AD8251ARMZ) and finally enters an AD acquisition chip (ADS8411) for analog signal acquisition.
The utility model discloses the key point: under the size of a standard board card, a mode of resistance voltage division, a following operational amplifier circuit and a switch is adopted, and the voltage acquisition range is expanded.
The utility model provides a standard bus board card on limited area, realize enlarging the problem that the analog quantity gathered the input voltage scope. By adopting a circuit mode of resistor voltage division, dial switch selection, operational amplifier follower circuit, signal selection and conditioning, the analog input voltage range is increased to 100VDC, the sampling rate of the board card is not influenced, and crosstalk is not generated among channels.
Due to the increase of the measurement range, the problems of high voltage to be acquired, complex system and miniaturization requirement of equipment in the same system are effectively solved, the problem of pain points in the industry is solved, and the project cost is reduced.
The utility model discloses an optional alternative:
1) under the size of a standard board card, resistors are used for voltage division, the resistance values of the resistors are possibly different, and the proportional relation is possibly different;
2) the network forming resistor voltage division may be different, and the dial switch may be in other forms such as jumper;
3) the operational amplifier types of the rear operational amplifier circuits can be different;
4) the conditioning circuit may or may not have an analog switch;
5) in the conditioning circuit, the conditioning mode of the stage after the analog switch can be different.
The present invention is not described in detail in the prior art.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A signal acquisition circuit with wide voltage range input comprises a dial switch SW1, a two-way amplifier, an analog switch and a gain control chip, and is characterized in that the voltage acquisition range is expanded by combining a resistance voltage division circuit, a conditioning circuit and the analog switch, and the conditioning circuit uses an operational amplifier to form a following circuit; the resistors are respectively arranged between the dial switch SW1 and the dual-path amplifier, between the dual-path amplifier and the analog switch, between the analog switch and the gain control chip, and the output end of the gain control chip is used for voltage division; the gain control chip is connected with the AD acquisition chip to acquire analog signals.
2. The signal acquisition circuit with wide voltage range input of claim 1, wherein the gain control chip employs AD8251 ARMZ.
3. The wide voltage range input signal acquisition circuit as claimed in claim 1, wherein said analog switch employs ADG1206 YRUZ.
4. The wide voltage range input signal acquisition circuit according to claim 1, wherein the AD acquisition chip employs ADs 8411.
5. The signal acquisition circuit with wide voltage range input of claim 1, wherein the resistors are 8 groups.
6. A wide voltage range input signal acquisition circuit according to any of claims 1 to 5, wherein the voltage range of the circuit is extended from-10V to ± 7.5V, ± 15V, ± 30V, ± 60V and ± 100V, and the conditioning circuit is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022166326.5U CN213904093U (en) | 2020-09-27 | 2020-09-27 | Signal acquisition circuit of wide voltage range input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022166326.5U CN213904093U (en) | 2020-09-27 | 2020-09-27 | Signal acquisition circuit of wide voltage range input |
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| Publication Number | Publication Date |
|---|---|
| CN213904093U true CN213904093U (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022166326.5U Active CN213904093U (en) | 2020-09-27 | 2020-09-27 | Signal acquisition circuit of wide voltage range input |
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| CN (1) | CN213904093U (en) |
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2020
- 2020-09-27 CN CN202022166326.5U patent/CN213904093U/en active Active
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