CN112098762A - Discrete switching value acquisition and detection circuit - Google Patents
Discrete switching value acquisition and detection circuit Download PDFInfo
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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 mutually connected. The invention can realize the 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 indication of the state of the airborne equipment, and is also called a discrete signal, for example, a seat ejection signal, a landing gear signal, a door opening signal and the like recorded in the flight parameter recording system are all airborne switching signals, and the state types of the airborne switching signals mainly include 28V/ground, 28V/suspension, ground/suspension and the like.
The ejection signal of the seat in the airborne is generally in a ground/empty type, namely when the seat is not ejected, the output type of the airborne equipment is in a ground state, and when the seat is ejected from the machine, the output state of the airborne equipment is in a suspended state. The low oil level signal of the oil tank is generally 28V/empty type, namely when the oil level of the oil tank is low, the output state of the airborne equipment is 28V signal, and when the oil level of the oil tank is normal, the output type of the airborne equipment is in suspension state. The icing signal of the airplane is generally of a 28V/ground type, namely when the airplane is iced, the output state of the on-board equipment is a 28V signal, and when the airplane is not iced, the output state of the on-board equipment is a ground signal.
The switching value is a status indication indicating whether the on-board equipment works normally, and plays an important role in judging the flight safety of the airplane and the operation of a driver. When the onboard equipment works clearly and 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 the normal function and needs the circuit self-checking capability.
Disclosure of Invention
Therefore, in order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a discrete switching value collecting and detecting circuit, so as to realize normal collection of switching signals while having a complete channel self-checking function.
In order to achieve the above object, 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 signal is input through the discrete switching value input pin, and the pull-up processing circuit selectively pulls up the discrete switching value interface according to different acquisition types of the discrete switching value input signal interface;
the hysteresis comparison circuit comprises a comparator, a divider resistor and a voltage stabilizing diode, wherein the divider resistor and the voltage stabilizing diode are sequentially connected with the negative end of the comparator, the divider resistor is connected with a pull-up resistor R1 of the pull-up processing circuit, and the voltage stabilizing diode is connected between the divider 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, 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.
Further, the analog selection switch comprises a first controller, the first controller receives a signal of a control port of the voltage selection circuit, and a power supply of the voltage selection circuit is controlled to be communicated with a voltage pin of the pull-up circuit or communicated with a pull-up resistor R5 of the hysteresis comparison circuit.
Further, 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.
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 greater 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 comprises a first self-checking mode and a second self-checking mode, and in the first self-checking mode, the first controller controls a negative voltage power supply VDD to be communicated with the pull-up resistor R5; in the second self-test 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 when the second controller judges that the interface acquisition type is 28V/empty, 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 control ports are normal acquisition mode signals.
Further, the control ports comprise a first control port and a second control port, and when the first control port and the second control port are (0,1), the first control port and the second control port are first self-checking mode signals; and when the first control port and the second control port are (1,0), the signal is a second self-checking mode signal.
Further, the discrete switching value input pins are connected in parallel in more than one group, and correspondingly, the switching value modulation output pins are connected in parallel in more than one group.
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 realize the detection of the channel.
Drawings
FIG. 1 is a circuit schematic of one embodiment of the discrete switching value acquisition and detection circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
In an embodiment of the present invention, as shown in fig. 1, a discrete switching value collecting and detecting circuit is provided, which includes a discrete switching value input pin, a pull-up processing circuit 1, a voltage selecting circuit 3, a comparison hysteresis circuit 2 and a switching value modulation output pin that are connected to 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 signal is input through the discrete switching value input pin, and the pull-up processing circuit 1 selectively pulls up the discrete switching value interface according to different acquisition types of the discrete switching value input signal interface;
the hysteresis comparison circuit 2 comprises a comparator, and a voltage division resistor and a voltage stabilizing diode which are sequentially connected with the negative end of the comparator, wherein the voltage division 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 division 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
The SO _1-SO _8 switching value modulation output pins are in 5V and 0V states
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. In one embodiment of the present invention,
VCC is 5V power
VDD is-15V power
V _ T is more 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 the V _ T of the voltage selection circuit; when the interface acquisition type is "28V/empty", the pin is floating.
Further, the analog selection switch comprises a first controller, the first controller receives a signal of a control port of the voltage selection circuit, and a power supply of the voltage selection circuit is controlled to be communicated with a voltage pin of the pull-up circuit or communicated with 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 a 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.
In one embodiment, the self-test mode includes a first self-test mode and a second self-test mode, and in the first self-test mode, the first controller controls the negative voltage power supply VDD to be communicated with the pull-up resistor R5; in the second self-test 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 when the second controller judges that the interface acquisition type is 28V/empty, the voltage pin is suspended.
In one embodiment, 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 (0,1), the first control port is a first self-checking mode signal; and when the first control port and the second control port are (1,0), the signal is a second self-checking mode signal. The control ports of the voltage selection circuit 3 include V _ sel1, V _ sel2 normal acquisition mode: set to 00;
self-checking mode: the settings are 01 and 10, and the interface circuit self-test is performed.
In one embodiment, the discrete switching value input pins are more than one set and are connected in parallel, and correspondingly, the switching value modulation output pins are more than one set and are connected in parallel.
The discrete switching value input signal is 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 signal, and the signal subjected to pull-up or pull-down processing by the pull-up processing circuit is output to a signal acquisition circuit to be subjected to state acquisition, processing and judgment, so that different state combinations of the airborne switch input signal are identified; the isolation circuit consists of a plurality of isolation resistors, each airborne switch input signal is connected in series with one isolation resistor, and the other end of each isolation resistor is connected with the input end of the selection circuit, so that the interior of the universal circuit is isolated from airborne state signal output equipment on the airplane through the resistors, and the normal operation of the equipment on the airplane is not influenced by the damage of the interior circuit of the universal circuit; 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 upper pull-down processing circuit and a lower pull-down processing circuit, the number of the selected paths is set according to the actual situation, and the selection circuit sequentially gates the input signals of the multi-path airborne switch at the front end and outputs the signals to the upper pull-down processing circuit and the lower pull-down processing circuit for processing; the pull-up and pull-down processing circuit comprises a 4-to-1 analog switch, the analog switch sets the number of selected paths according to the actual situation, the single end of the analog switch is connected with the output end of the analog switch, the 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 performing pull-up processing on voltage signals output by the analog switch, the resistors R7 and R8 are pull-down resistors and are used for performing pull-down processing on the voltage signals output by the analog switch, the resistor 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 R8 is connected with the ground, and two control ends of the analog switch are connected with the address selection end of the analog switch to perform pull-up and pull-down selection; the signal acquisition circuit realizes state acquisition of the processed airborne switch input signal and comprises an analog/digital (A/D) converter, wherein the input end of the A/D converter is connected with the output end of the analog switch, the processed airborne switch input signal is subjected to voltage acquisition, and two states of the processed airborne switch input signal are identified.
The operation of the circuit of the present invention is described as follows:
for the ground/open channel, V _ P and V _ T are short-circuited, the switching value interface is pulled up by more than +24V,
for 28V/open channel, the V _ P pin is floating.
a) Normal acquisition mode
V _ sel1, V _ sel2 set to "00", VCC (+5V) is connected to R5, double threshold 1.153V and 3.546V can be realized according to the selected resistor in the schematic diagram, divider resistors R2/100K and R3/34.8K of the negative terminal of the comparator, the divider coefficient is 1/3.9, V1 is a voltage regulator tube with a voltage stabilizing value of 5.5V, when abnormal high voltage signal appears in KG1 input signal, the negative input terminal of the comparator can be protected from high voltage and damage, V2 is a clamp diode, when the output of the comparator is negative voltage, the negative voltage can be clamped at the lowest-0.7V because of the clamp diode, when the output of the comparator is positive voltage, the diode has no influence, therefore, because of the action of diode V2, the output range of SO _1-SO _8 is: the range of-0.7V-VCC.
When the voltage to ground of the interface is less than 4.5V, the output of the comparator is 1, the state is judged to be the ground state, the voltage to ground of the interface is more than 14V, the output of the comparator is 0, and the state is judged to be the open circuit state.
b) Self-checking mode
1) When V _ sel1 and V _ sel2 are set to be 01, VDD (-15V) is connected to R5, when two comparison thresholds of the hysteresis comparator are 4.578V and-2.558V respectively, and when the interface is in a ground state or an open circuit (or 28V) state, because of the existence of the interface voltage stabilizing tube, the voltage range of the negative terminal of the comparator is-0.7V-5.5V, the voltage range of the interface is higher than the two hysteresis thresholds of the comparator (-4.578V, -2.558V), 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 the two comparison thresholds of the hysteretic comparator are +6.6V and +9.3V respectively, no matter the interface is in a ground state or an open circuit (or 28V) state, because of the existence of the interface regulator tube, the voltage range of the negative terminal of the comparator is-0.7V-5.5V, the voltage range of the interface is lower than the two hysteretic thresholds of the comparator (+6.6V, +9.3V), and therefore, the output of the comparator is "1";
3) therefore, the interface state can be detected by the settings of V _ sel1, V _ sel2, and the output state of the comparator. And the self-checking process is not influenced by the switching value input signal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A 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 comparison hysteresis circuit and a switching value modulation output pin which are connected with one another; 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 signal is input through the discrete switching value input pin, and the pull-up processing circuit selectively pulls up the discrete switching value interface according to different acquisition types of the discrete switching value input signal interface;
the hysteresis comparison circuit comprises a comparator, a divider resistor and a voltage stabilizing diode, wherein the divider resistor and the voltage stabilizing diode are sequentially connected with the negative end of the comparator, the divider resistor is connected with a pull-up resistor R1 of the pull-up processing circuit, and the voltage stabilizing diode is connected between the divider 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, 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.
2. The discrete switching value collecting and detecting circuit according to claim 1, wherein the analog selection switch comprises a first controller, the first controller receives a signal of a control port of the voltage selection circuit, and a power supply of the voltage selection circuit is controlled to be communicated with a voltage pin of the pull-up circuit or communicated with a pull-up resistor R5 of the hysteresis comparison circuit.
3. The discrete switching value acquisition and detection circuit of claim 2 wherein 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 vt.
4. The discrete switching value acquisition and detection circuit of claim 3, wherein the positive voltage supply VCC is a 5V supply, the negative voltage supply VDD is a-15V supply, and the positive voltage threshold supply V _ T is a supply greater than 24V.
5. The discrete switching value collecting and detecting circuit according to claim 3, wherein when the mode signal of the control port is a normal collecting mode signal, the first controller controls a positive voltage power source 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.
6. The discrete switching value collecting and detecting circuit according to claim 5, wherein the self-test mode comprises a first self-test mode and a second self-test mode, and in the first self-test mode, the first controller controls a negative voltage power supply VDD to be communicated with the pull-up resistor R5; in the second self-test mode, the first controller controls the positive voltage threshold power supply V _ T to be communicated with the pull-up resistor R5.
7. The discrete switching value collecting and detecting circuit according to claim 1, wherein the pull-up processing circuit further comprises a second controller, the second controller connects the voltage pin to the power supply for pull-up when the interface collecting type is determined to be ground/on; and when the second controller judges that the interface acquisition type is 28V/empty, the voltage pin is suspended.
8. The discrete switching value acquisition and detection circuit of claim 5 wherein the control ports comprise a first control port and a second control port, and when the first and second control ports are (0,0), a normal acquisition mode signal.
9. The discrete switching value acquisition and detection circuit of claim 5 wherein the control ports comprise a first control port and a second control port, a first self-test mode signal when the first and second control ports are (0, 1); and when the first control port and the second control port are (1,0), the signal is a second self-checking mode signal.
10. The discrete switching value collecting and detecting circuit according to claim 1, wherein the discrete switching value input pins are one or more groups and connected in parallel, and correspondingly, the switching value modulation output pins are one or more groups and connected in parallel.
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| CN202010998812.5A CN112098762A (en) | 2020-09-22 | 2020-09-22 | Discrete switching value acquisition and detection circuit |
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| 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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