CN110830023A - Discrete magnitude acquisition circuit suitable for threshold value accurate setting - Google Patents
Discrete magnitude acquisition circuit suitable for threshold value accurate setting Download PDFInfo
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- CN110830023A CN110830023A CN201911023222.4A CN201911023222A CN110830023A CN 110830023 A CN110830023 A CN 110830023A CN 201911023222 A CN201911023222 A CN 201911023222A CN 110830023 A CN110830023 A CN 110830023A
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- acquisition circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
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Abstract
The invention provides a discrete quantity acquisition circuit suitable for accurately setting a threshold value, which is used for accurately acquiring an external discrete quantity signal and realizing accurate setting of the threshold value and comprises a ground/open discrete quantity acquisition circuit and a 28V/open discrete quantity acquisition circuit. The discrete quantity acquisition circuit can accurately set acquisition threshold values of ground/on and 28V/on discrete signals, can accurately acquire the discrete signals, has a circuit self-checking function, can quickly locate problems in the circuit, and has high testability and maintainability. Compared with the traditional discrete quantity acquisition circuit, the invention has the advantages of accurate acquisition and accurate setting of the threshold value.
Description
Technical Field
The invention relates to a discrete magnitude acquisition circuit suitable for accurately setting a threshold value, and belongs to the technical field of aviation and electrical.
Background
In the aviation electrical equipment, the discrete quantity acquisition circuit mainly realizes the acquisition of discrete signals such as ground/on and 28V/on. The traditional discrete magnitude acquisition circuit consists of a photoelectric coupler, a diode, a resistor, a capacitor and the like. For the ground/open discrete magnitude acquisition circuit, when the input signal is a low-level signal, the ground/open discrete magnitude acquisition circuit is identified as a ground effective state; for the 28V/on discrete magnitude acquisition circuit, when the input signal is a high level signal, the active state of 28V is identified. High and low levels do not have exact thresholds. Therefore, the acquisition threshold of the discrete input signal is uncertain and cannot be accurately set, and the function of accurately setting the acquisition threshold required by certain military products cannot be realized.
Disclosure of Invention
The invention aims to provide a discrete quantity acquisition circuit suitable for accurately setting a threshold value, which aims to accurately acquire an external discrete quantity signal and realize accurate setting of the threshold value.
The invention has the technical scheme that the discrete magnitude acquisition circuit suitable for accurately setting the threshold value comprises a ground/open discrete magnitude acquisition circuit and a 28V/open discrete magnitude acquisition circuit;
wherein, ground/open discrete magnitude acquisition circuit includes: a four-difference comparator M1A, resistors R1-R6, capacitors C1-C2 and diodes D1-D2; a VCC pin of the four-differential comparator M1A is connected to a 15V power supply CK +15V, a GND pin of the four-differential comparator M1A is connected to a ground CKGND of the power supply CK +15V, both ends of a resistor R1 are connected to a second input positive terminal 2IN + of the four-differential comparator M1A and a ground CKGND of the power supply CK +15V, both ends of a resistor R2 are connected to a second input positive terminal 2IN + of the four-differential comparator M1A and a 15V power supply CK +15V, both ends of a resistor R3 are connected to a second output terminal 2OUT of the four-differential comparator M1A and the 15V power supply CK +15V, one end of a resistor R4 is connected to a second output terminal 2OUT of the four-differential comparator M1A, the other end is an output signal CKOUT _1 of the ground/ground discrete quantity acquisition circuit, one end of the resistor R5 is connected to a second input negative terminal 2 IN-of the four-differential comparator M1A, the other end of the resistor R1 is connected to a positive terminal D84 and a negative terminal of the power supply CK 6, and the two ends of the differential comparator M1 + 15V-differential comparator M2 +15V A are connected; the negative end of the diode D1 is connected with an input signal CKIN _1 of the ground/open discrete magnitude acquisition circuit, the negative end of the diode D2 is connected with a self-checking input signal DK _ BIT of the ground/open discrete magnitude acquisition circuit, two ends of the capacitor C1 are respectively connected with a 15V power supply CK +15V and a ground CKGND of the power supply CK +15V, and two ends of the capacitor C2 are respectively connected with a second input negative end 2 IN-of the four-difference comparator M1A and the ground CKGND of the power supply CK + 15V;
the 28V/on discrete magnitude acquisition circuit comprises a four-difference comparator M1B, resistors R7-R12, a capacitor C3 and diodes D3-D4; one end of a resistor R7 is connected with the first input positive terminal 1IN + of the four-differential comparator M1B, the other end is connected with the negative terminals of the diodes D3 and D4, the two ends of a resistor R8 are respectively connected with the first input positive terminal 1IN + of the four-differential comparator M1B and the ground CKGND of the power supply CK +15V, the two ends of a resistor R9 are respectively connected with the first output terminal 1OUT of the four-differential comparator M1B and the 15V power supply CK +15V, one end of a resistor R10 is connected with the first output terminal 1OUT of the four-differential comparator M1B, the other end is the output signal CKOUT _2 of the 28V/open discrete quantity acquisition circuit, the two ends of the resistor R11 are respectively connected with the first input negative terminal 1 IN-of the four-differential comparator M1B and the ground CKGND of the power supply CK +15V, and the two ends of the resistor R12 are respectively connected with the first input negative terminals 1 IN-15V power supply CK +15V of; the positive terminal of the diode D4 is connected to the input signal CKIN _2 of the 28V/open discrete quantity acquisition circuit, the positive terminal of the diode D3 is connected to the self-test input signal GK _ BIT of the 28V/open discrete quantity acquisition circuit, and the two terminals of the capacitor C3 are connected to the first input positive terminal 1IN + of the four-differential comparator M1B and the ground CKGND of the power supply CK +15V, respectively.
The four-differential comparator is characterized in that M1A and M1B are two channels of a four-differential comparator M1 respectively.
The method is characterized in that the peripheral resistance of the four-difference comparators M1A and M1B is matched to realize the accurate setting of the discrete quantity acquisition threshold.
The method is characterized in that a ground state is detected when the voltage to ground of the discrete magnitude input interface is less than or equal to 4.0V and greater than or equal to-4.5V through the resistance values of the matching resistors R1-R6.
The method is characterized in that the '28V' state is detected when the input voltage of the discrete quantity input interface is larger than or equal to 16V through the resistance values of the matching resistors R7-R12.
The ground/open discrete magnitude acquisition circuit is characterized in that an input signal CKIN _1 of the ground/open discrete magnitude acquisition circuit realizes acquisition of a ground/open discrete magnitude signal.
The earth/open discrete magnitude acquisition circuit is characterized in that a self-checking input signal DK _ BIT of the earth/open discrete magnitude acquisition circuit realizes the BIT self-checking function of the earth/open discrete magnitude acquisition circuit.
The method is characterized in that the input signal CKIN _2 of the 28V/open discrete magnitude acquisition circuit realizes acquisition of the 28V/open discrete magnitude signal.
The self-checking circuit is characterized in that a self-checking input signal GK _ BIT of the 28V/open discrete quantity acquisition circuit realizes the BIT self-checking function of the 28V/open discrete quantity acquisition circuit.
The invention has the beneficial effects that: the method for realizing the discrete quantity acquisition circuit suitable for accurately setting the threshold value can accurately set the acquisition threshold values of ground/on and 28V/on discrete signals, can accurately acquire the discrete signals, has a circuit self-checking function, can quickly locate problems in the circuit, and has high testability and maintainability. Compared with the traditional discrete quantity acquisition circuit, the invention has the advantages of accurate acquisition and accurate setting of the threshold value.
Drawings
FIG. 1 is a circuit for acquiring ground/open discrete quantity
FIG. 2 is a circuit for acquiring 28V/on discrete quantity
Detailed Description
The connection structure of the present invention will be described in detail with reference to the accompanying drawings and examples.
The ground/open discrete magnitude acquisition circuit shown in fig. 1 requires that a ground state should be detected when the voltage to ground of the discrete magnitude input interface is equal to or less than 4.0V and equal to or more than-4.5V;
1) according to the chip manual, the voltage at the input end of the four-differential comparator M1 must be greater than 0, so that R6/R5 in the circuit should be less than 3.33. The R6 is set to be 10K, R5 is 3.3K, and R6/R5 are 3.03 at the moment, so that the requirements are met.
2) Determining the voltage at the trip point of a four differential comparator M1A
When the voltage of CKIN _1 is less than or equal to 4V, the voltage drop of the diode D1 is considered to be 0.7V,
the voltage of the 4 pin of M1A is less than or equal to 4.7V + (15V-4.7V) × R5/(R5+ R6)
＝4.7V+(15V-4.7V)*3.3K/(3.3K+10K)
＝7.25V
In order to ensure that the voltage CKIN _1 is not turned over when the voltage is more than 4V, 5 pins at the turning point are selected to have the voltage of 7.5V. When R1 is 10K, R2 is R1 is 10K.
3) Verifying whether a ground signal is detected when the voltage to ground of the discrete magnitude input interface is 4V, 0V or-4.5V
a) When CKIN _1 voltage is 4V,
4-pin voltage 4.7V + (15V-4.7V) × R5/(R5+ R6)
＝4.7V+(15V-4.7V)*3.3K/(3.3K+10K)
＝7.25V
At this time, 2IN + >2IN-, 2 pin output is open, CKOUT _1 is CK +15V, and meets the requirement.
b) When CKIN _1 voltage is equal to 0V,
4-pin voltage 0.7V + (15V-0.7V) × R5/(R5+ R6)
＝0.7V+(15V-0.7V)*3.3K/(3.3K+10K)
＝4.25V
At this time, 2IN + >2IN-, pin2 outputs open circuit, CKOUT _1 is CK +15V, meeting the requirement.
c) When CKIN _1 voltage is-4.5V,
voltage of 4 pins: (-4.5V +0.7V) + (15V- (-4.5V + 0.7V)). R5/(R5+ R6) ═ 3.8V + (15V + 3.8V). 3.3K/(3.3K +10K)
＝0.86V
At this time, 2IN + >2IN-, pin2 outputs open circuit, CKOUT _1 is CK +15V, meeting the requirement.
4) Determining the boundary of the ground signal detected by the ground/open discrete quantity acquisition circuit
Let CKIN _1 be x
a) For positive boundary, (x +0.7V) + (15V-x-0.7V). times.3K/(3.3K +10K) < 7.5V, giving x +0.7V < 5.027V, giving x < 4.327V
b) For negative boundaries, (x +0.7V) + (15V-x-0.7V). times.3K/(3.3K +10K) > 0V gives x +0.7V > -4.95V and x > -5.65V
The input range of the ground valid signal is-5.65V < CKIN-1 < 4.327V. Therefore, the design requirement that when the voltage to the ground of the discrete magnitude input interface is less than or equal to 4.0V and greater than or equal to-4.5V, the discrete magnitude output is in an effective ground state can be guaranteed.
As shown in fig. 2, the 28V/on discrete magnitude acquisition circuit requires that the "28V" state should be detected when the input voltage of the discrete magnitude input interface is equal to or greater than 16V.
6-pin voltage 15V R11/(R11+ R12)
＝15V*10K/(10K+20K)
＝5V
CKIN _2 voltage 5V/R8 (R8+ R7) +0.7V
＝5V/5.1K*(5.1K+10K)+0.7V
＝15.5V
1) When the CKIN _2 voltage is larger than 15.5V, the pin 7 voltage is larger than the pin 6 voltage which is 5V
At this time, 2IN + >2IN-, 2 pin output is open, and CKOUT _2 is CK + 15V.
2) When the voltage CKIN _2 is less than 15.5V, the voltage of the 7 pin is less than the voltage of the 6 pin, and the voltage of the 5 pin is 5V
At this time, 2IN + < 2IN-, 2-pin outputs CKGND, CKOUT _2 is CKGND.
The "28V" state can be detected when the input voltage of the discrete magnitude input interface CKIN _2 is equal to or greater than 16V.
Compared with the existing product, the invention can accurately set the acquisition threshold values of ground/open and 28V/open discrete signals, can accurately acquire the discrete signals, has the circuit self-checking function, can quickly locate problems in the circuit, and has higher testability and maintainability.
Claims (9)
1. A discrete magnitude acquisition circuit suitable for accurately setting a threshold value comprises a ground/open discrete magnitude acquisition circuit and a 28V/open discrete magnitude acquisition circuit;
wherein, ground/open discrete magnitude acquisition circuit includes: a four-difference comparator M1A, resistors R1-R6, capacitors C1-C2 and diodes D1-D2; a VCC pin of the four-differential comparator M1A is connected to a 15V power supply CK +15V, a GND pin of the four-differential comparator M1A is connected to a ground CKGND of the power supply CK +15V, both ends of a resistor R1 are connected to a second input positive terminal 2IN + of the four-differential comparator M1A and a ground CKGND of the power supply CK +15V, both ends of a resistor R2 are connected to a second input positive terminal 2IN + of the four-differential comparator M1A and a 15V power supply CK +15V, both ends of a resistor R3 are connected to a second output terminal 2OUT of the four-differential comparator M1A and the 15V power supply CK +15V, one end of a resistor R4 is connected to a second output terminal 2OUT of the four-differential comparator M1A, the other end is an output signal CKOUT _1 of the ground/ground discrete quantity acquisition circuit, one end of the resistor R5 is connected to a second input negative terminal 2 IN-of the four-differential comparator M1A, the other end of the resistor R1 is connected to a positive terminal D84 and a negative terminal of the power supply CK 6, and the two ends of the differential comparator M1 + 15V-differential comparator M2 +15V A are connected; the negative end of the diode D1 is connected with an input signal CKIN _1 of the ground/open discrete magnitude acquisition circuit, the negative end of the diode D2 is connected with a self-checking input signal DK _ BIT of the ground/open discrete magnitude acquisition circuit, two ends of the capacitor C1 are respectively connected with a 15V power supply CK +15V and a ground CKGND of the power supply CK +15V, and two ends of the capacitor C2 are respectively connected with a second input negative end 2 IN-of the four-difference comparator M1A and the ground CKGND of the power supply CK + 15V;
the 28V/on discrete magnitude acquisition circuit comprises a four-difference comparator M1B, resistors R7-R12, a capacitor C3 and diodes D3-D4; one end of a resistor R7 is connected with the first input positive terminal 1IN + of the four-differential comparator M1B, the other end is connected with the negative terminals of the diodes D3 and D4, the two ends of a resistor R8 are respectively connected with the first input positive terminal 1IN + of the four-differential comparator M1B and the ground CKGND of the power supply CK +15V, the two ends of a resistor R9 are respectively connected with the first output terminal 1OUT of the four-differential comparator M1B and the 15V power supply CK +15V, one end of a resistor R10 is connected with the first output terminal 1OUT of the four-differential comparator M1B, the other end is the output signal CKOUT _2 of the 28V/open discrete quantity acquisition circuit, the two ends of the resistor R11 are respectively connected with the first input negative terminal 1 IN-of the four-differential comparator M1B and the ground CKGND of the power supply CK +15V, and the two ends of the resistor R12 are respectively connected with the first input negative terminals 1 IN-15V power supply CK +15V of; the positive terminal of the diode D4 is connected to the input signal CKIN _2 of the 28V/open discrete quantity acquisition circuit, the positive terminal of the diode D3 is connected to the self-test input signal GK _ BIT of the 28V/open discrete quantity acquisition circuit, and the two terminals of the capacitor C3 are connected to the first input positive terminal 1IN + of the four-differential comparator M1B and the ground CKGND of the power supply CK +15V, respectively.
2. The circuit for sampling discrete quantity suitable for accurate setting of threshold value as claimed in claim 1, wherein M1A and M1B are two channels of a four differential comparator M1, respectively.
3. The discrete quantity acquisition circuit suitable for accurate setting of the threshold value as claimed in claim 2, wherein the accurate setting of the discrete quantity acquisition threshold value is realized by matching peripheral resistances of four differential comparators M1A and M1B.
4. The discrete quantity acquisition circuit suitable for accurately setting the threshold value as claimed in claim 3, wherein a ground state is detected when the voltage to the ground of the discrete quantity input interface is equal to or less than 4.0V and equal to or more than-4.5V by matching the resistance values of the resistors R1-R6.
5. The discrete quantity acquisition circuit suitable for accurately setting the threshold value as claimed in claim 4, wherein the '28V' state is detected when the input voltage of the discrete quantity input interface is equal to or greater than 16V by matching the resistance values of the resistors R7-R12.
6. The discrete quantity acquisition circuit suitable for precisely setting the threshold as claimed in claim 5, wherein the input signal CKIN _1 of the ground/open discrete quantity acquisition circuit realizes acquisition of the ground/open discrete quantity signal.
7. The discrete quantity acquisition circuit suitable for accurately setting the threshold as claimed in claim 6, wherein the self-test input signal DK _ BIT of the ground/on discrete quantity acquisition circuit implements BIT self-test function of the ground/on discrete quantity acquisition circuit.
8. The discrete quantity acquisition circuit suitable for accurately setting the threshold as claimed in claim 7, wherein the input signal CKIN _2 of the 28V/on discrete quantity acquisition circuit realizes acquisition of the 28V/on discrete quantity signal.
9. The discrete quantity acquisition circuit suitable for accurately setting the threshold value as claimed in claim 8, wherein the self-test input signal GK _ BIT of the 28V/on discrete quantity acquisition circuit implements a BIT self-test function of the 28V/on discrete quantity acquisition circuit.
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| CN201911023222.4A CN110830023A (en) | 2019-10-25 | 2019-10-25 | Discrete magnitude acquisition circuit suitable for threshold value accurate setting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089022A (en) * | 2021-11-12 | 2022-02-25 | 天津航空机电有限公司 | Low-power consumption discrete quantity acquisition circuit based on multi-voltage framework |
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| CN203554410U (en) * | 2013-10-30 | 2014-04-16 | 中国航空工业集团公司第六三一研究所 | 28V/open circuit discrete magnitude input preprocessing circuit |
| CN105699798A (en) * | 2014-11-28 | 2016-06-22 | 上海航空电器有限公司 | BIT self-detection method of onboard complex alarm equipment |
| CN106533216A (en) * | 2016-12-26 | 2017-03-22 | 中电科航空电子有限公司 | Airborne airport wireless communication equipment power supply based on vehicle-mounted equipment power supply |
| CN206362879U (en) * | 2016-12-05 | 2017-07-28 | 中国计量大学 | Mutual inductor polarity detection means |
| CN206894618U (en) * | 2017-06-30 | 2018-01-16 | 中国航空无线电电子研究所 | Discrete magnitude interface circuit |
-
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- 2019-10-25 CN CN201911023222.4A patent/CN110830023A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203554410U (en) * | 2013-10-30 | 2014-04-16 | 中国航空工业集团公司第六三一研究所 | 28V/open circuit discrete magnitude input preprocessing circuit |
| CN105699798A (en) * | 2014-11-28 | 2016-06-22 | 上海航空电器有限公司 | BIT self-detection method of onboard complex alarm equipment |
| CN206362879U (en) * | 2016-12-05 | 2017-07-28 | 中国计量大学 | Mutual inductor polarity detection means |
| CN106533216A (en) * | 2016-12-26 | 2017-03-22 | 中电科航空电子有限公司 | Airborne airport wireless communication equipment power supply based on vehicle-mounted equipment power supply |
| CN206894618U (en) * | 2017-06-30 | 2018-01-16 | 中国航空无线电电子研究所 | Discrete magnitude interface circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114089022A (en) * | 2021-11-12 | 2022-02-25 | 天津航空机电有限公司 | Low-power consumption discrete quantity acquisition circuit based on multi-voltage framework |
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