CN112098762B - Discrete switching value acquisition and detection circuit - Google Patents
Discrete switching value acquisition and detection circuit Download PDFInfo
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- CN112098762B CN112098762B CN202010998812.5A CN202010998812A CN112098762B CN 112098762 B CN112098762 B CN 112098762B CN 202010998812 A CN202010998812 A CN 202010998812A CN 112098762 B CN112098762 B CN 112098762B
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention provides a discrete switching value acquisition and detection circuit which comprises a discrete switching value input pin, a pull-up processing circuit, a voltage selection circuit, a comparison hysteresis circuit and a switching value modulation output pin which are connected with each other. The invention can realize normal collection of discrete signals and has complete channel self-checking function.
Description
Technical Field
The invention belongs to the technical field of avionics, and particularly relates to a discrete switching value acquisition and detection circuit.
Background
The switching value is a signal commonly used in the state indication of airborne equipment, and is also called a discrete signal, such as a seat ejection signal, a landing gear signal, a cabin door opening signal and the like recorded in an flying parameter recording system are all airborne switching signals, and the state types of the airborne switching signals mainly comprise 28V/ground, 28V/suspension, ground/suspension and the like.
The on-board seat ejection signal is generally of a ground/air type, namely, when the seat is not ejected, the output type of the on-board equipment is of a ground state, and when the seat is ejected from the on-board equipment, the output state of the on-board equipment is of a suspended state. The low oil level signal of the oil tank is generally 28V/empty, namely, when the oil level of the oil tank is low, the output state of the airborne equipment is 28V, and when the oil level of the oil tank is normal, the output state of the airborne equipment is in a suspended state. The aircraft icing signal is typically of the 28V/ground type, i.e. the on-board device outputs a 28V signal when the aircraft is icing and a ground signal when the aircraft is not icing.
The switching value represents a state indication of whether the on-board equipment works normally or not, and plays an important role in flight safety of the airplane and operation judgment of a driver. When the on-board equipment clearly works normally, but the acquisition circuit itself is abnormal, the acquired switching value and the state of the actual monitoring equipment are wrong, which may cause the pilot to make wrong flight judgment. Therefore, the designed switching value acquisition circuit has normal functions and also needs circuit self-checking capability.
Disclosure of Invention
Therefore, in order to overcome the defects of the prior art, the invention provides a discrete switching value acquisition and detection circuit, so that the normal acquisition of switching signals is realized and the complete channel self-checking function is realized.
In order to achieve the above purpose, a discrete switching value acquisition and detection circuit is provided, which comprises a discrete switching value input pin, a pull-up processing circuit, a voltage selection circuit, a comparison hysteresis circuit and a switching value modulation output pin which are connected with each other; the pull-up processing circuit comprises a pull-up resistor R1 connected with the discrete switching value input pin and a voltage pin connected with the pull-up resistor R1; the discrete switching value input signals are input through the discrete switching value input pins, and the pull-up processing circuit selectively pulls up the discrete switching value interfaces according to the difference of acquisition types of the discrete switching value input signal interfaces;
The hysteresis comparison circuit comprises a comparator, and a voltage dividing resistor and a voltage stabilizing diode which are connected with the negative end of the comparator in sequence, wherein the voltage dividing resistor is connected with a pull-up resistor R1 of the pull-up processing circuit, and the voltage stabilizing diode is connected between the voltage dividing resistor and the comparator; the hysteresis comparison circuit further comprises a clamping diode connected to the output end of the comparator, and the clamping diode is connected with the switching value conditioning output pin;
the voltage selection circuit comprises a power supply, a control port and an analog selection switch, wherein the analog selection switch can selectively control the power supply to be communicated with a voltage pin of the pull-up circuit and a pull-up resistor R5 of the hysteresis comparison circuit according to different mode signals of the control port.
Further, the analog selection switch comprises a first controller, wherein the first controller receives a signal of a control port of the voltage selection circuit, and controls a power supply of the voltage selection circuit to be communicated with a voltage pin of the pull-up circuit or a pull-up resistor R5 of the hysteresis comparison circuit.
Further, the power supply of the voltage selection circuit includes a positive voltage power supply VCC, a negative voltage power supply VDD, and a positive voltage threshold power supply v_t.
Further, the positive voltage power supply VCC is a 5V power supply, the negative voltage power supply VDD is a-15V power supply, and the positive voltage threshold power supply V_T is a power supply larger than 24V.
Further, when the mode signal of the control port is a normal acquisition mode signal, the first controller controls the positive voltage power supply VCC to be communicated with the pull-up resistor R5; when the mode signal of the control port is a self-checking mode signal, the first controller controls the negative voltage power supply VDD or the positive voltage threshold power supply v_t to be communicated with the pull-up resistor R5.
Further, the self-checking mode includes a first self-checking mode and a second self-checking mode, and in the first self-checking mode, the first controller controls the negative voltage power supply VDD to be communicated with the pull-up resistor R5; in the second self-checking mode, the first controller controls the positive voltage threshold power supply V_T to be communicated with the pull-up resistor R5.
Further, the pull-up processing circuit further comprises a second controller, and when the second controller judges that the interface acquisition type is ground/on, the voltage pin is connected to the power supply for pull-up; and the second controller judges that the interface acquisition type is 28V/space, and the voltage pin is suspended.
Further, the control ports include a first control port and a second control port, and when the first control port and the second control port are (0, 0), the signals are normal acquisition mode signals.
Further, the control port includes a first control port and a second control port, and is a first self-test mode signal when the first control port and the second control port are (0, 1); and when the first control port and the second control port are (1, 0) and are the second self-checking mode signals.
Further, the discrete switching value input pins are more than one group and connected in parallel, and correspondingly, the switching value modulation output pins are more than one group and connected in parallel.
Compared with the prior art, the invention can ensure that the circuit can realize the self-checking of the channel after the product is electrified, and can realize the normal acquisition function after the self-checking is finished. The invention can realize a complete and accurate detection method and detection of the channel.
Drawings
FIG. 1 is a circuit schematic of one embodiment of a discrete switching value acquisition and detection circuit of the present invention.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
In one embodiment of the present invention, as shown in fig. 1, a discrete switching value acquisition and detection circuit is provided, which includes a discrete switching value input pin, a pull-up processing circuit 1, a voltage selection circuit 3, a comparison hysteresis circuit 2 and a switching value modulation output pin which are connected with each other; the pull-up processing circuit 1 comprises a pull-up resistor R1 connected with the discrete switching value input pin and a voltage pin connected with the pull-up resistor R1; the discrete switching value input signals are input through the discrete switching value input pins, and the pull-up processing circuit 1 selectively pulls up the discrete switching value interfaces according to the difference of the collection types of the discrete switching value input signal interfaces;
The hysteresis comparison circuit 2 comprises a comparator, and a voltage dividing resistor and a voltage stabilizing diode which are connected with the negative end of the comparator in sequence, wherein the voltage dividing resistor is connected with a pull-up resistor R1 of the pull-up processing circuit, and the voltage stabilizing diode is connected between the voltage dividing resistor and the comparator; the hysteresis comparison circuit further comprises a clamping diode connected to the output end of the comparator, and the clamping diode is connected with the switching value conditioning output pin;
The voltage selection circuit 3 comprises a power supply, a control port and an analog selection switch, and the analog selection switch can selectively control the power supply to be communicated with a voltage pin of the pull-up circuit and a pull-up resistor R5 of the hysteresis comparison circuit according to different mode signals of the control port.
In particular, refer to FIG. 1
KG1-KG8 is a discrete switching value input pin and supports two input types of 28V/on and ground/on
SO_1-SO_8 switching value modulation output pin is in 5V and 0V states
The power supplies of the voltage selection circuit comprise a positive voltage power supply VCC, a negative voltage power supply VDD and a positive voltage threshold power supply V_T. In one embodiment of the present invention, in one embodiment,
VCC 5V power supply
VDD is-15V power supply
V_T is greater than 24V power supply
Wherein VSS of the comparator is +15V power supply
When the interface acquisition type is ground/on, the voltage pin V_P is connected with V_T of the voltage selection circuit; when the interface acquisition type is 28V/empty, the pin is suspended.
Further, the analog selection switch comprises a first controller, wherein the first controller receives a signal of a control port of the voltage selection circuit, and controls a power supply of the voltage selection circuit to be communicated with a voltage pin of the pull-up circuit or a pull-up resistor R5 of the hysteresis comparison circuit.
In one embodiment, when the mode signal of the control port is a normal acquisition mode signal, the first controller controls the positive voltage power supply VCC to communicate with the pull-up resistor R5; when the mode signal of the control port is a self-checking mode signal, the first controller controls the negative voltage power supply VDD or the positive voltage threshold power supply v_t to be communicated with the pull-up resistor R5.
In one embodiment, the self-checking mode includes a first self-checking mode and a second self-checking mode, and in the first self-checking mode, the first controller controls the negative voltage power supply VDD to be communicated with the pull-up resistor R5; in the second self-checking mode, the first controller controls the positive voltage threshold power supply V_T to be communicated with the pull-up resistor R5.
In one embodiment, the pull-up processing circuit further includes a second controller, and when the second controller determines that the interface acquisition type is ground/on, the voltage pin is connected to the power supply to pull up; and the second controller judges that the interface acquisition type is 28V/space, and the voltage pin is suspended.
In one embodiment, the control ports include a first control port and a second control port, and the first and second control ports are (0, 1) first self-test mode signals; and when the first control port and the second control port are (1, 0) and are the second self-checking mode signals. The control ports of the voltage selection circuit 3 include v_sel1, v_sel2 normal acquisition mode: set to 00;
self-checking mode: and setting the interface circuit to be 01 and 10, and performing self-checking on the interface circuit.
In one embodiment, the discrete switching value input pins are more than one set and connected in parallel, and correspondingly, the switching value modulation output pins are more than one set and connected in parallel.
The discrete switching value input signals are output to a pull-up processing circuit after being gated by a voltage selection circuit, the output voltage of the input selection circuit is subjected to pull-up processing according to different types of the discrete switching value input signals, and the signals which are pulled up or pulled down by the pull-up processing circuit are output to a signal acquisition circuit for state acquisition, processing and judgment, so that different state combinations of the airborne switching input signals are identified; the isolation circuit is composed of a plurality of isolation resistors, each path of airborne switch input signal is connected with one isolation resistor in series, and the other end of the isolation resistor is connected with the input end of the selection circuit, so that the inside of the general circuit and airborne state signal output equipment on the aircraft are isolated through the resistors, and the damage of the internal circuit of the general circuit is ensured not to influence the normal operation of the equipment on the aircraft; the selection circuit comprises a multi-selection analog switch, the input end of the analog switch is connected with an isolation resistor, the output end of the analog switch is connected with an up-pull processing circuit and a down-pull processing circuit, the number of the selected paths is set according to actual conditions, and the selection circuit sequentially gates the input signals of the multi-path onboard switch at the front end and outputs the signals to the up-pull processing circuit and the down-pull processing circuit for processing; the pull-up and pull-down processing circuit comprises a 4-choice 1 analog switch, the number of the routes selected by the analog switch is set according to actual conditions, a single end of the analog switch is connected with an output end of the analog switch, multiple selection ends of the analog switch are respectively connected with resistors R5, R6, R7 and R8, wherein the resistors R5 and R6 are pull-up resistors and are used for carrying out pull-up processing on voltage signals output by the analog switch, the resistors R7 and R8 are pull-down resistors and are used for carrying out pull-down processing on the voltage signals output by the analog switch, the R5 is connected with a power supply VCC1, the R6 is connected with a power supply VCC2, the R7 is connected with the ground, the two control ends of the analog switch are connected with an address selection end of the analog switch, and the pull-up and pull-down selection is carried out; the signal acquisition circuit is used for realizing state acquisition of the processed airborne switch input signal and comprises an A/D converter, the input end of the A/D converter is connected with the output end of the analog switch, voltage acquisition is carried out on the processed airborne switch input signal, and two states of the airborne switch input signal are identified.
The following describes the operation of the circuit of the present invention:
For the ground/open channel, v_p and v_t are shorted, the switching interface performs a pull-up above +24V,
For 28V/on channel, the v_p pin is suspended.
A) Normal acquisition mode
V_sel1 and V_sel2 are set to be '00', VCC (+5V) is connected to R5, double thresholds of 1.153V and 3.546V can be realized according to resistors selected in a schematic diagram, voltage dividing resistors R2/100K and R3/34.8K at the negative end of the comparator are provided, the voltage dividing coefficient is 1/3.9, V1 is a voltage stabilizing tube with a voltage stabilizing value of 5.5V, when an abnormally high voltage signal appears on the KG1 input signal, the negative input end of the comparison can be protected from being damaged due to high voltage, V2 is a clamping diode, when the output of the comparator is negative voltage, the clamping diode can clamp at the minimum of-0.7V due to the existence of the clamping diode, and when the output of the comparator is positive voltage, the diodes have no effect, so_1-SO_8 have the following output ranges: -a range of 0.7V-VCC.
When the interface ground voltage is smaller than 4.5V, the comparator outputs 1, the ground state is judged, the interface ground voltage is larger than 14V, the comparator outputs 0, and the open state is judged.
B) Self-checking mode
1) When V_sel1 and V_sel2 are set to be '01', VDD (-15V) is connected to R5, and when two comparison thresholds of the hysteresis comparator are-4.578V and-2.558V respectively, no matter the interface is in a ground state or the interface is in an open circuit (or 28V) state, because of the existence of an interface voltage stabilizing tube, the voltage range of the negative terminal of the comparator is-0.7V-5.5V, and the voltage range of the interface is higher than the two hysteresis thresholds (-4.578V, -2.558V) of the comparator, so that the output of the comparator is '0';
2) When V_sel1 and V_sel2 are set to be 10, V_T (+24V) is connected to R5, and when two comparison thresholds of the hysteresis comparator are +6.6V and +9.3V respectively, no matter the interface is in a ground state or the interface is in an open circuit (or 28V) state, because of the existence of an interface voltage stabilizing tube, the voltage range of the negative terminal of the comparator is-0.7V-5.5V, and the voltage range of the interface is lower than the two hysteresis thresholds (+6.6V and +9.3V) of the comparator, so that the output of the comparator is 1;
3) Thus, the interface state can be detected by the setting of v_sel1, v_sel2 and the output state of the comparator. And the self-checking process is not affected by the switching value input signal.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (3)
1. The discrete switching value acquisition and detection circuit is characterized by comprising a discrete switching value input pin, a pull-up processing circuit, a voltage selection circuit, a hysteresis comparison circuit and a switching value modulation output pin which are connected with each other; the pull-up processing circuit comprises a pull-up resistor R1 connected with the discrete switching value input pin and a voltage pin connected with the pull-up resistor R1; the discrete switching value input signals are input through the discrete switching value input pins, and the pull-up processing circuit selectively pulls up the discrete switching value interfaces according to different acquisition types of the discrete switching value input signal interfaces;
the hysteresis comparison circuit comprises a comparator, and a voltage dividing resistor and a voltage stabilizing diode which are connected with the negative end of the comparator in sequence, wherein the voltage dividing resistor is connected with a pull-up resistor R1 of the pull-up processing circuit, and the voltage stabilizing diode is connected between the voltage dividing resistor and the comparator; the hysteresis comparison circuit further comprises a clamping diode connected to the output end of the comparator, and the clamping diode is connected with the switching value modulation output pin;
the voltage selection circuit comprises a power supply, a control port and an analog selection switch, wherein the analog selection switch can selectively control the power supply to be communicated with a voltage pin of the pull-up processing circuit and a pull-up resistor R5 of the hysteresis comparison circuit according to different mode signals of the control port;
The analog selection switch comprises a first controller, wherein the first controller receives a signal of a control port of the voltage selection circuit and controls a power supply of the voltage selection circuit to be communicated with a voltage pin of the pull-up processing circuit or a pull-up resistor R5 of the hysteresis comparison circuit;
the power supply of the voltage selection circuit comprises a positive voltage power supply VCC, a negative voltage power supply VDD and a positive voltage threshold power supply V_T;
When the mode signal of the control port is a normal acquisition mode signal, the first controller controls the positive voltage power supply VCC to be communicated with the pull-up resistor R5; when the mode signal of the control port is a self-checking mode signal, the first controller controls a negative pressure power supply VDD or a positive pressure threshold power supply V_T to be communicated with the pull-up resistor R5;
The self-checking mode comprises a first self-checking mode and a second self-checking mode, and in the first self-checking mode, the first controller controls the negative pressure power supply VDD to be communicated with the pull-up resistor R5; in the second self-checking mode, the first controller controls a positive-voltage threshold power supply V_T to be communicated with the pull-up resistor R5;
the pull-up processing circuit further comprises a second controller, and when the second controller judges that the interface acquisition type is ground/on, the voltage pin is connected to the power supply for pull-up; the second controller judges that the interface acquisition type is 28V/space, and the voltage pin is suspended;
The control port comprises a first control port and a second control port, and when the first control port and the second control port are (0, 0), the signals are normal acquisition mode signals;
When the first control port and the second control port are (0, 1), the first control port and the second control port are the first self-checking mode signals; and when the first control port and the second control port are (1, 0) and are the second self-checking mode signals.
2. The discrete switching value acquisition and detection circuit of claim 1, wherein the positive voltage power supply VCC is a 5V power supply, the negative voltage power supply VDD is a-15V power supply, and the positive voltage threshold power supply v_t is a power supply greater than 24V.
3. The discrete switching value acquisition and detection circuit of claim 1, wherein the discrete switching value input pins are more than one set and connected in parallel, and correspondingly the switching value modulation output pins are more than one set and connected in parallel.
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| CN118731504A (en) * | 2021-09-26 | 2024-10-01 | 北京计算机技术及应用研究所 | A multi-purpose switch quantity detection device |
| CN114236243A (en) * | 2021-11-19 | 2022-03-25 | 湖南省拓联精密科技有限公司 | Resistance measuring method, device, equipment and storage medium |
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