CN117439607B - Universal analog quantity acquisition circuit - Google Patents
Universal analog quantity acquisition circuit Download PDFInfo
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- CN117439607B CN117439607B CN202311767973.3A CN202311767973A CN117439607B CN 117439607 B CN117439607 B CN 117439607B CN 202311767973 A CN202311767973 A CN 202311767973A CN 117439607 B CN117439607 B CN 117439607B
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- 238000000034 method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1071—Measuring or testing
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Abstract
The invention belongs to the technical field of power electronics, and particularly relates to a generalized analog quantity acquisition circuit. Comprising the following steps: the device comprises a generalized configuration circuit and two conditioning circuits, wherein the generalized configuration circuit comprises four resistors, a second end of R1 is grounded, two ends of R2 are respectively connected with an analog input signal and a second end of R3, a first end of R3 is connected with a 2.5V power supply, and a second end of R4 is grounded; the first conditioning circuit consists of an operational amplifier M1A, wherein the positive end of the input end of the M1A is connected with the public ends of R2 and R3, the negative end of the input is connected with the output end of the M1A, and the positive end of the power supply is connected with a 5V power supply; the second conditioning circuit comprises five resistors and an operational amplifier M1B, wherein two ends of R5 are respectively connected with an output end of M1A, a first end of R6 and a negative end of an input end of M1B, a second end of R6 is connected with the output end of M1B and the first end of R9, and two ends of R7 are respectively connected with a 2.5V power supply, a first end of R8 and an input positive end of M1B.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a generalized analog quantity acquisition circuit.
Background
Analog acquisition is a common basic function of electronic equipment, and analog signals to be acquired are usually converted into analog signals with a certain amplitude through an acquisition circuit due to processing capacity. The traditional analog quantity acquisition circuit is divided into a direct current voltage acquisition circuit, a direct current acquisition circuit, an alternating current voltage acquisition current and an alternating current acquisition circuit, all the circuits cannot be used commonly, suitability and universality are not achieved, and when external requirements are changed, the circuits are required to be redesigned, so that time and labor cost are increased.
Meanwhile, after the acquisition circuit is damaged, the traditional acquisition circuit does not have a function of quick positioning, so that fault positioning, troubleshooting and function repairing of a fault product are inconvenient.
Disclosure of Invention
The invention aims to: the universal analog quantity acquisition circuit is provided for realizing the functions of acquiring alternating current, direct current voltage and current.
The technical scheme is as follows:
a generalized analog acquisition circuit comprising: a generalized configuration circuit, a first conditioning circuit, a second conditioning circuit, wherein,
the generalized configuration circuit consists of resistors R1, R2, R3 and R4, wherein a first end of the R2 is connected with an analog input signal, a second end of the R1 is grounded, a second end of the R2 is connected with a second end of the R3, a first end of the R3 is connected with a 2.5V power supply, and a second end of the R4 is grounded;
the first conditioning circuit consists of an operational amplifier M1A, wherein the positive end of the input end of the M1A is connected with the public ends of R2 and R3, the negative end of the input end of the M1A is connected with the output end of the M1A, the positive end of the power supply end of the M1A is connected with a 5V power supply, and the negative end of the power supply end of the M1A is grounded;
the second conditioning circuit is composed of resistors R5, R6, R7, R8, R9 and an operational amplifier M1B, wherein a first end of the R5 is connected with an output end of the M1A, a second end of the R5 is connected with a first end of the R6 and a negative end of an input end of the M1B, a second end of the R6 is connected with the output end of the M1B and the first end of the R9, a first end of the R7 is connected with a 2.5V power supply, a second end of the R7 is connected with a first end of the R8 and a positive end of the input end of the M1B, a second end of the R8 is grounded, a positive end of a power supply end of the M1B is connected with a 5V power supply, and a negative end of the power supply end of the M1B is grounded.
Further, when the circuit is used for collecting direct-current voltage, the resistor R1 is not connected in the generalized configuration circuit, and only the resistors R2, R3 and R4 are connected to realize the collection function, and the first end of R4 is connected with the second end of R2 and the second end of R3.
Further, when the circuit is used for collecting direct current, the resistor R4 is not connected in the generalized configuration circuit, and only the resistors R1, R2 and R3 are connected to realize the collection function, and the first end of the R1 is connected with the first end of the R2.
Further, when the circuit is used for collecting alternating voltage, the resistor R1 is not connected in the generalized configuration circuit, and only the resistors R2, R3 and R4 are connected to realize the collection function, and the first end of the R4 is connected with the second end of the R2 and the second end of the R3.
Further, when the circuit is used for collecting alternating current, the resistor R4 is not connected in the generalized configuration circuit, and only the resistors R1, R2 and R3 are connected to realize the collection function, and the first end of the R1 is connected with the first end of the R2.
Further, the calculation formula of the output voltage is:
wherein ANALOG_IN is the input.
Further, the calculation formula of the output voltage is:
wherein ANALOG_IN is the input.
Further, the calculation formula of the output voltage is:
wherein ANALOG_IN is the input.
Further, the calculation formula of the output voltage is:
wherein ANALOG_IN is the input.
The beneficial effects are that:
the invention can be used for configuring the acquisition circuit for acquiring alternating current and direct current voltage and current by adjusting the specifications of R1, R2, R3 and R4 in the generalized configuration circuit. Through the first conditioning circuit, the voltage following function is realized, and the influence on analog quantity signals by a subsequent circuit is reduced. Through the second conditioning circuit, a subtraction function is realized, and the output voltage and the input analog quantity are guaranteed to be in a negative correlation relationship, so that the function of wire breakage detection is realized.
The universal configuration area can be used for adjusting the analog quantity type acquired by a circuit and can be used for matching the analog quantity range by adjusting the resistance values of four resistors. The function of collecting AC and DC voltage and current is realized. Meanwhile, the broken wire detection function is added, and on the premise of widening the application range of the circuit, the quick positioning, fault elimination and function repair after the circuit faults are facilitated.
Drawings
FIG. 1 is a generalized analog acquisition circuit.
Detailed Description
The invention designs a universal analog quantity acquisition circuit, which can widen the application range of the circuit, and simultaneously increases the function of wire breakage detection, thereby having great practical value for the subsequent maintenance of the circuit.
The invention is described below with reference to the drawings and specific embodiments.
The circuit comprises a generalized configuration circuit, a first conditioning circuit and a second conditioning circuit, and is shown in fig. 1. The generalized configuration circuit consists of resistors R1, R2, R3 and R4, wherein a first end of the resistor R1 is connected with a first end of the resistor R2 and is connected with an analog input signal, a second end of the resistor R1 is grounded, a second end of the resistor R2 is connected with a second end of the resistor R3 and a first end of the resistor R4, a first end of the resistor R3 is connected with a 2.5V power supply, and a second end of the resistor R4 is grounded. The first conditioning circuit is composed of an operational amplifier M1A, the positive end of the input end of the M1A is connected with the public ends of R2, R3 and R4, the negative end of the input end of the M1A is connected with the output end of the M1A, the positive end of the power supply end of the M1A is connected with a 5V power supply, and the negative end of the power supply end of the M1A is grounded. The second conditioning circuit is composed of resistors R5, R6, R7, R8, R9 and an operational amplifier M1B, wherein a first end of the R5 is connected with an output end of the M1A, a second end of the R5 is connected with a first end of the R6 and a negative end of an input end of the M1B, a second end of the R6 is connected with the output end of the M1B and the first end of the R9, a first end of the R7 is connected with a 2.5V power supply, a second end of the R7 is connected with a first end of the R8 and a positive end of the input end of the M1B, a second end of the R8 is grounded, a positive end of a power supply end of the M1B is connected with a 5V power supply, and a negative end of the power supply end of the M1B is grounded.
The generalized configuration resistor has four R1, R2, R3 and R4. When the circuit is used for collecting direct-current voltage, the resistor R1 is not connected, and the collection function can be realized only by connecting the resistors R2, R3 and R4.
The generalized configuration resistor has four R1, R2, R3 and R4. When the circuit is used for collecting direct current, the resistor R4 is not connected, and the collection function can be realized only by connecting the resistors R1, R2 and R3.
The generalized configuration resistor has four R1, R2, R3 and R4. When the circuit is used for collecting alternating voltage, the resistor R1 is not connected, and the collection function can be realized only by connecting the resistors R2, R3 and R4.
The generalized configuration resistor has four R1, R2, R3 and R4. When the circuit is used for collecting alternating current, the resistor R4 is not connected, and the collection function can be realized only by connecting the resistors R1, R2 and R3.
The input analog signal is connected with a 2.5V power supply through R4 to compensate the input analog.
The input analog signal and the output analog signal have a negative correlation. And judging whether the conditioning circuit has a wire breakage phenomenon or not according to the negative correlation relation between the input analog quantity signal and the output analog quantity signal.
1) The direct current voltage acquisition process comprises the following steps:
the calculation formula of the DC voltage output voltage is as follows:
wherein ANALOG_IN is the input.
When 28V DC voltage is externally input, namely ANALOG_IN is 28 IN the formula, the numerical values of R2, R3, R4, R5, R6, R7 and R8 are sequentially verified and brought into the formula, and the output voltage can be calculated. The output voltage is a direct current voltage signal.
2) The direct current collection process comprises the following steps:
the calculation formula of the DC output voltage is as follows:
when 100mA direct current is externally input, namely ANALOG_IN is 0.1 IN the formula, the numerical values of R1, R2, R3, R5, R6, R7 and R8 are sequentially verified and brought into the formula, and the output voltage can be calculated. The output voltage is a direct current voltage signal.
3) The alternating current voltage acquisition process comprises the following steps:
the calculation formula of the alternating voltage output voltage is as follows:
when an alternating current sine wave with an effective value of 115V is externally input, namely ANALOG_IN is 115 IN the formula, the numerical values of R2, R3, R4, R5, R6, R7 and R8 are sequentially verified and brought into the formula, and the output voltage can be calculated. The output voltage is an alternating voltage signal.
4) The alternating current collection process comprises the following steps:
the calculation formula of the alternating current output voltage is as follows:
when an alternating current sine wave with an effective value of 100mA is externally input, namely ANALOG_IN is 0.1 IN the formula, the numerical values of R1, R2, R3, R5, R6, R7 and R8 are sequentially verified and brought into the formula, and the output voltage can be calculated. The output voltage is an alternating voltage signal.
Description of principle:
when the output voltage and the input signal are in positive correlation or even in direct proportion, if the input of the external signal is 0, the output voltage should be 0V; in a specific scenario, if the output voltage is detected to be 0V, it cannot be identified whether this phenomenon is caused by the input signal being 0 or the acquisition circuit being damaged. The design ensures that the output voltage and the input signal are in a negative correlation relationship, so that the problems can be avoided, the self-checking of the circuit can be realized, and when the output voltage is 4V, the input signal can be considered to be 0; when the output voltage is 0V, the acquisition circuit can be considered to be damaged.
The output voltage and the input signal are in a negative correlation, and by setting the R5-R8 resistor, the output voltage is about 4V when no external signal is input, and the output voltage linearly decreases along with the input signal along with the increase of the external signal. And by setting the resistors R1-R4, the output voltage is not less than 1V when the maximum value of the rated range of the input signal is ensured. The design can ensure that the rated value of the output voltage is 1-4V, so that when the output voltage enters the rear-end A/D conversion circuit, a boundary area is avoided, and the accuracy of A/D conversion is improved.
Claims (9)
1. A generalized analog acquisition circuit, comprising: a generalized configuration circuit, a first conditioning circuit, a second conditioning circuit, wherein,
the generalized configuration circuit consists of resistors R1, R2, R3 and R4, wherein a first end of the R2 is connected with an analog input signal, a first end of the R1 is grounded, a second end of the R2 is connected with a second end of the R3, a first end of the R3 is connected with a 2.5V power supply, and a second end of the R4 is grounded;
the first conditioning circuit consists of an operational amplifier M1A, wherein the positive end of the input end of the M1A is connected with the public ends of R2 and R3, the negative end of the input end of the M1A is connected with the output end of the M1A, the positive end of the power supply end of the M1A is connected with a 5V power supply, and the negative end of the power supply end of the M1A is grounded;
the second conditioning circuit is composed of resistors R5, R6, R7, R8, R9 and an operational amplifier M1B, wherein a first end of the R5 is connected with an output end of the M1A, a second end of the R5 is connected with a first end of the R6 and a negative end of an input end of the M1B, a second end of the R6 is connected with the output end of the M1B and the first end of the R9, a first end of the R7 is connected with a 2.5V power supply, a second end of the R7 is connected with a first end of the R8 and a positive end of the input end of the M1B, a second end of the R8 is grounded, a second end of the R9 is output, a positive end of a power supply end of the M1B is connected with a 5V power supply, and a negative end of the power supply end of the M1B is grounded.
2. The generalized analog quantity acquisition circuit according to claim 1, wherein when the circuit is used for acquiring direct current voltage, the resistor R1 is not connected in the generalized configuration circuit, and only the resistors R2, R3 and R4 are connected to realize the acquisition function, and the first end of R4 is connected to the second end of R2 and the second end of R3.
3. The generalized analog quantity acquisition circuit according to claim 1, wherein when the circuit is used for acquiring direct current, the resistor R4 is not connected in the generalized configuration circuit, and only the resistors R1, R2 and R3 are connected to realize the acquisition function, and the second end of R1 is connected to the first end of R2.
4. The generalized analog quantity acquisition circuit according to claim 1, wherein when the circuit is used for acquiring an alternating voltage, the resistor R1 is not connected in the generalized configuration circuit, and only the resistors R2, R3 and R4 are connected to realize the acquisition function, and the first end of R4 is connected to the second end of R2 and the second end of R3.
5. The generalized analog quantity acquisition circuit according to claim 1, wherein when the circuit is used for acquiring alternating current, the resistor R4 is not connected in the generalized configuration circuit, and only the resistors R1, R2 and R3 are connected to realize the acquisition function, and the second end of R1 is connected to the first end of R2.
6. The generalized analog quantity acquisition circuit of claim 2, wherein the output voltage is calculated by the formula:
wherein ANALOG_IN is the input.
7. A generalized analog quantity acquisition circuit according to claim 3, wherein the output voltage is calculated by the formula:
wherein ANALOG_IN is the input.
8. The generalized analog quantity acquisition circuit of claim 4, wherein the output voltage is calculated by the formula:
，
wherein ANALOG_IN is the input.
9. The generalized analog quantity acquisition circuit of claim 5, wherein the output voltage is calculated by the formula:
wherein ANALOG_IN is the input.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764920A (en) * | 2014-01-03 | 2015-07-08 | 国家电网公司 | MMC flexible direct-current power transmission dynamic simulation experiment platform analog acquisition system and realizing method |
| JP2018093574A (en) * | 2016-11-30 | 2018-06-14 | ローム株式会社 | AC current detection circuit |
| CN108768380A (en) * | 2018-08-24 | 2018-11-06 | 唐智科技湖南发展有限公司 | A kind of modulate circuit of sensor |
| CN213023325U (en) * | 2020-09-04 | 2021-04-20 | 东土科技(宜昌)有限公司 | Analog quantity voltage acquisition circuit |
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| US7564249B2 (en) * | 2003-12-21 | 2009-07-21 | Tk Holdings, Inc. | Signal processing system and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764920A (en) * | 2014-01-03 | 2015-07-08 | 国家电网公司 | MMC flexible direct-current power transmission dynamic simulation experiment platform analog acquisition system and realizing method |
| JP2018093574A (en) * | 2016-11-30 | 2018-06-14 | ローム株式会社 | AC current detection circuit |
| CN108768380A (en) * | 2018-08-24 | 2018-11-06 | 唐智科技湖南发展有限公司 | A kind of modulate circuit of sensor |
| CN213023325U (en) * | 2020-09-04 | 2021-04-20 | 东土科技(宜昌)有限公司 | Analog quantity voltage acquisition circuit |
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