CN110542848A - Discrete magnitude acquisition power-on BIT self-detection circuit based on micro relay - Google Patents
Discrete magnitude acquisition power-on BIT self-detection circuit based on micro relay Download PDFInfo
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- G—PHYSICS
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- 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 relates to a BIT self-detection circuit for collecting discrete quantity based on a miniature relay, and belongs to the technical field of aviation and electrics. The invention adopts the two-way multi-contact relay to respectively realize the switching of the discrete quantity acquisition channel and the simulation of the discrete quantity signal, thereby greatly reducing the scale and the complexity of the BIT self-detection circuit; and the power-on BIT detection mode is adopted, so that the influence on the system work is reduced, and the false alarm rate is effectively reduced. The design of the circuit and the high-level voltage division calculation process meet the forward design requirements of aviation products, the component parameters are simple to calculate, the application range is wide, and the circuit is a discrete quantity acquisition BIT self-detection circuit with good use value. The circuit is applied to a BIT self-detection circuit on discrete quantity of a lubricating oil temperature controller, and has the advantages of good BIT detection effect, high reliability and low false alarm rate.
Description
Technical Field
The invention belongs to the technical field of aviation electricity, and particularly relates to a discrete quantity acquisition power-on BIT self-detection circuit based on a miniature relay.
Background
Due to the working requirements of the system, a large number of discrete quantity signals outside and inside the controller need to be acquired by the airborne electromechanical controller, and the signals are generally used as judgment bases for starting/stopping control, cross-linking equipment state feedback, product power supply state and the like. Due to the improvement of the intelligent level of the airplane, the requirement on the BIT self-detection capability of the system is higher and higher, and higher importance level exists for some discrete quantity signals influencing the working time sequence and the state of the system, so that the BIT self-detection circuit design is required to be carried out on the discrete quantity acquisition circuit of the controller. For the discrete quantity acquisition circuit, two failure modes of validity of a signal to be acquired and invalidity of an acquisition result exist, invalidity of the signal to be acquired and validity of the acquisition result, so that the discrete quantity acquisition BIT self-detection circuit needs to be capable of covering the failure modes, and meanwhile, in order to reduce influence on system work, the discrete quantity acquisition BIT detection is carried out in a power-on BIT detection mode. However, the introduction of the BIT self-detection circuit increases the volume and weight of the product and the total failure rate of components of the product.
Disclosure of Invention
technical problem to be solved
The technical problem to be solved by the invention is as follows: how to design a discrete quantity acquisition power-on BIT self-detection circuit for detecting whether the discrete quantity acquisition circuit has a fault.
(II) technical scheme
In order to solve the technical problem, the invention provides a discrete quantity acquisition power-on BIT self-detection circuit based on a miniature relay, which is used for detecting whether a discrete quantity acquisition circuit has a fault or not and comprises a discrete quantity acquisition channel switching circuit and a discrete quantity signal simulation circuit; the discrete quantity acquisition channel switching circuit is designed through a multi-channel miniature relay, and acts first when the discrete quantity acquisition channel switching circuit executes power-on BIT self-detection; then realize through another multichannel miniature relay and resistance partial pressure discrete magnitude signal analog circuit, when discrete magnitude acquisition circuit passageway switches to discrete magnitude signal analog circuit, this another multichannel miniature relay action simulates discrete magnitude effectively, invalid two kinds of states respectively, waits that the controller accomplishes the collection and the trouble judges the back, and two multichannel miniature relay release resume initial condition.
Preferably, the discrete quantity acquisition channel switching circuit comprises a diode D1 and a multi-channel micro relay K1, wherein the anode, pin 1, of the diode D1 is connected with the cathode, pin 2, of the control coil of the multi-channel micro relay K1, and the cathode, pin 2, of the diode D1 is connected with the anode, pin 1, of the control coil of the multi-channel micro relay K1; a normally closed point 3 pin and a normally closed point 6 pin of the multi-channel micro relay K1 are connected, then the multi-channel micro relay K1 is connected with an internal power ground, and then the multi-channel micro relay K1 is connected with a pin 4 and a pin 7, and then the multi-channel micro relay K1 is connected with a detected object, namely a pin 2/4/6 of an optical coupler OP2 in the discrete quantity acquisition circuit and used for controlling the switching between the effective and the ineffective of discrete quantity signals of the power;
The discrete magnitude signal analog circuit comprises a diode D2, a multi-channel micro relay K2 and resistors R1-R2, wherein the anode, namely a pin 1, of the diode D2 is connected with the cathode, namely a pin 2, of a control coil of the multi-channel micro relay K2, and the cathode, namely a pin 2, of the diode D2 is connected with the anode, namely a pin 1, of the control coil of the multi-channel micro relay K2; one pin of the resistor R1 is connected with a 28V power supply, the other pin of the resistor R1 is connected with the 4 pins of the multi-channel micro relay K2, one pin of the resistor R2 is connected with the 4 pins of the multi-channel micro relay K2, the other pin of the resistor R2 is connected with 28V ground, and the R1 and the R2 are used for forming a level value consistent with the external discrete quantity to be acquired through voltage division; the 7-pin 28V ground of the multi-channel miniature relay K2 is used for simulating discrete quantity signals.
Preferably, the pins of the normally closed point 9 and the normally closed point 12 of the multi-channel micro relay K1 are connected with an external alarm discrete quantity signal; a normally open point 11 pin and a normally open point 14 pin of the multichannel micro relay K1 are connected with a normally open point 5 pin of the multichannel micro relay K2, namely an internal analog discrete magnitude signal source; a pin 10 of the multi-channel miniature relay K1 is connected with a pin 5 of an optical coupler OP1 in the discrete quantity acquisition circuit, and a pin 13 of the relay K1 is connected with a pin 7 of an optical coupler OP 1.
Preferably, a pin 15 of a normally closed point and a pin 18 of the multi-channel micro relay K1 are connected with an external automatic control discrete magnitude signal; a normally-open point 17 pin and a normally-open point 20 pin of the multichannel micro relay K1 are connected with a normally-open point 8 pin of the multichannel micro relay K2, namely an internal analog discrete magnitude signal source; 16 feet of the multi-channel micro relay K1 are connected with 2 feet of the optical coupler OP1, 19 feet of the multi-channel micro relay K1 are connected with 4 feet of the optical coupler OP1, and the diode D1 is a rectifier diode and is used for releasing reverse electromotive force of a coil when the multi-channel micro relay K1 is powered off.
Preferably, the resistances of the R1 and R2 are selected according to the high level value of the discrete magnitude signal to be simulated.
Preferably, the multi-channel minirelay K1 is a multi-contact minirelay.
Preferably, the multi-channel miniaturised relay K2 is a multi-contact subminiature relay.
Preferably, the diode D2 is a rectifier diode, and is used for releasing coil back electromotive force when the multichannel micro relay K2 is powered off.
Preferably, the resistance of R1 is 1.8K Ω.
Preferably, the discrete quantity acquisition power-on BIT self-detection circuit is applied to an oil temperature controller.
(III) advantageous effects
The invention adopts the two-way multi-contact relay to respectively realize the switching of the discrete quantity acquisition channel and the simulation of the discrete quantity signal, thereby greatly reducing the scale and the complexity of the BIT self-detection circuit; and the power-on BIT detection mode is adopted, so that the influence on the system work is reduced, and the false alarm rate is effectively reduced. The design of the circuit and the high-level voltage division calculation process meet the forward design requirements of aviation products, the component parameters are simple to calculate, the application range is wide, and the circuit is a discrete quantity acquisition BIT self-detection circuit with good use value. The circuit is applied to a BIT self-detection circuit on discrete quantity of a lubricating oil temperature controller, and has the advantages of good BIT detection effect, high reliability and low false alarm rate.
Drawings
FIG. 1 is a schematic diagram of a discrete quantity acquisition BIT self-detection circuit applied to an oil temperature controller;
Fig. 2 is a schematic diagram of a circuit for acquiring discrete quantities as a detection object of the present invention.
Detailed Description
in order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The airborne electromechanical product needs to acquire a plurality of paths of discrete quantity signals due to system time sequence and control requirements, the signal types mainly comprise ground/open, high/open (28V, 10V, 5V) and the like, and the signal contents relate to control instructions, installation positions, system alarm signals and the like. For some highest-level control instructions, the signal effectiveness influences the reliability and safety of an electromechanical system, and in order to improve the testability level of the whole system, a BIT self-detection circuit needs to be designed for a discrete quantity acquisition circuit. The BIT detection circuit design needs to consider the circuit scale and the false alarm rate.
The discrete magnitude signal to be acquired is combed and classified, the discrete magnitude signal to be acquired is simulated on the basis of a two-way multi-contact relay (multi-channel relay), and then acquisition and detection are carried out in power-on BIT detection. The circuit adopts a multi-channel micro relay to control the channel switching of the acquisition channel, uses another micro relay to simulate several types of discrete magnitude signals to be acquired, and obtains matched high level signals for high/open signals through resistance voltage division. The BIT self-detection circuit for collecting the discrete quantities has simple logic, strong universality, small number of components and high reliability, and can be further expanded according to the quantity of the discrete quantities to be collected of the controller; the whole circuit design and calculation process meets the forward design requirements of airborne products.
The invention provides a discrete quantity acquisition power-on BIT self-detection circuit based on a miniature relay, which is applied to a lubricating oil temperature controller and is used for detecting whether a discrete quantity acquisition circuit breaks down or not. The discrete quantity acquisition channel switching circuit is designed through a multi-channel miniature relay, and the controller firstly acts when executing power-on BIT self-detection when being powered on; then realize through another multichannel miniature relay and resistance partial pressure discrete magnitude signal analog circuit, when discrete magnitude acquisition circuit passageway switches to discrete magnitude signal analog circuit, this another multichannel miniature relay action simulates discrete magnitude effectively, invalid two kinds of states respectively, waits that the controller accomplishes the collection and after the fault judgement, two way relay release resumes initial condition.
As shown in fig. 1 and fig. 2, the discrete quantity acquisition channel switching circuit includes a diode D1, a relay K1: the anode of the diode D1, namely the pin 1, is connected with the cathode of the control coil of the relay K1, namely the pin 2, and the cathode of the diode D1, namely the pin 2, is connected with the anode of the control coil of the relay K1, namely the pin 1; the normally closed point 3 pin and the normally closed point 6 pin of the relay K1 are connected, then the relay K1 is connected with the internal 5V/15V power ground, the 4 pin and the 7 pin of the relay K1 are connected, and then the relay K1 is connected with a detected object, namely the 2/4/6 pin of an optical coupler OP2 in the discrete quantity acquisition circuit shown in the figure 2, and the relay K1 is used for controlling the effective/ineffective switching of the discrete quantity signal of the power supply. Relay K1 is a multi-contact miniature relay.
The normally closed point 9 pin and the normally closed point 12 pin of the relay K1 are connected with an external alarm discrete quantity signal (an ejector alarm/heat dissipation air door alarm); the normally open point 11 pin and the normally open point 14 pin of the relay K1 are connected with the normally open point 5 pin (discrete magnitude signal source of internal simulation) of the relay K2; a pin 10 of the relay K1 is connected to a pin 5 of the optical coupler OP1 in the figure 2, and a pin 13 of the relay K1 is connected to a pin 7 of the optical coupler OP1 in the figure 2, so that switching of an external alarm discrete quantity signal channel is controlled.
A normally closed point 15 pin and a normally closed point 18 pin of the relay K1 are connected with an external automatic control discrete quantity signal (ejector automatic control/heat dissipation air door automatic control); a normally-open point pin 17 and a normally-open point pin 20 of the relay K1 are connected with a normally-open point pin 8 (an internal analog discrete quantity signal source) of the relay K2; a pin 16 of the relay K1 is connected to a pin 2 of the optical coupler OP1 in the figure 2, and a pin 19 of the relay K1 is connected to a pin 4 of the optical coupler OP1 in the figure 2, so that the switching of an external automatic control discrete magnitude signal channel is controlled. The diode D1 is a rectifier diode and is used for realizing the release of the coil back electromotive force when the relay is powered off.
The discrete magnitude signal analog circuit comprises a diode D2, a relay K2, a resistor R1-resistor R2, wherein the anode, namely a pin 1, of the diode D2 is connected with the cathode, namely a pin 2, of a control coil of the relay K2, and the cathode, namely a pin 2, of the diode D2 is connected with the anode, namely a pin 1, of a control coil of the relay K2; one pin of the resistor R1 is connected with a 28V power supply, the other pin of the resistor R1 is connected with the 4 pin of the relay K2, one pin of the resistor R2 is connected with the 4 pin of the relay K2, the other pin is connected with the 28V ground, and R1 and R2 are used for forming a level value consistent with the external high/open discrete quantity to be collected through voltage division (namely, a high-level effective signal simulating the high/open discrete quantity signal needs to be selected according to a voltage division value (a high-level value of the high/open discrete quantity signal needs to be simulated) after the optical coupling current limiting resistors are connected in parallel to form a R1/R2 resistance value); the 7 pin of the relay K2 is connected to 28V ground for analog ground/on discrete magnitude signal. Relay K2 is a multi-contact subminiature relay. The diode D2 is a rectifier diode and is used for realizing the release of the coil back electromotive force when the relay is powered off.
In fig. 2, resistors R3 to R16 are current limiting resistors. The method comprises the steps that 7 discrete quantity signals of three types are collected, wherein automatic control signals of a radiator air door and an ejector are ground/open signals; the radiator alarm signal and the ejector alarm signal are high/open signals; the three-way signal collected by the optical coupler OP2 is the BIT detection signal of 1-way DC15V and 2-way DC 5V.
High/open signal high level is simulated through resistance voltage division, when the optical coupler OP2 is switched on, R2(2K omega) is equivalently connected in parallel with R5(2K omega) in FIG. 2, 1.8K omega is selected as R1, and then the voltage between R1 and R2 is 10V.
The circuit of the invention switches the input signals at the front end of the discrete quantity acquisition circuit through one path of miniature multi-contact relay K1, and designs a discrete quantity signal source based on the other path of miniature relay K2, and simulates different types of discrete quantity signals which need to be acquired by a controller. When the controller is electrified and starts to work, the first relay K1 is controlled to act firstly, and the front end of the discrete quantity acquisition circuit is switched to the simulated discrete quantity signal source; then controlling the second relay K2 to act, respectively simulating two states of discrete magnitude signal validity and invalidity, and comparing the CPU acquisition result with the set result in each state; when the collection result is unanimous with the simulation discrete magnitude signal, discrete magnitude acquisition circuit work is normal, and when the collection result is inconsistent with the simulation discrete magnitude signal, discrete magnitude acquisition circuit is the trouble piece. The circuit simultaneously controls the switching of a plurality of paths of discrete magnitude acquisition channels through the multi-contact relay, normal working signals are at the normally closed end of the relay, and power-on BIT detection signals are at the normally open end of the relay.
The invention can be seen in that the discrete quantity acquisition power-on BIT self-detection circuit applied to the lubricating oil temperature controller adopts a multi-channel micro relay to control the channel switching of an acquisition channel according to the characteristics of more discrete quantity signals and more single type, and uses another multi-channel micro relay to simulate several types of discrete quantity signals to be acquired. When the controller is powered on, the discrete quantity signal acquisition channel is switched to the simulated discrete quantity signal channel through the multi-channel miniature relay, then the other multi-channel miniature relay simulating the discrete quantity signal is controlled to act, the simulation of the effective state and the invalid state of the discrete quantity signal is realized respectively, then the BIT self-detection is carried out on the state of the discrete quantity signal acquisition circuit through comparison of the acquisition result and the simulation condition, and the detection result is reported and then enters the normal working state.
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 quantity acquisition power-on BIT self-detection circuit based on a miniature relay is characterized in that the discrete quantity acquisition power-on BIT self-detection circuit is used for detecting whether a discrete quantity acquisition circuit fails or not, and comprises a discrete quantity acquisition channel switching circuit and a discrete quantity signal simulation circuit; the discrete quantity acquisition channel switching circuit is designed through a multi-channel miniature relay, and acts first when the discrete quantity acquisition channel switching circuit executes power-on BIT self-detection; then realize through another multichannel miniature relay and resistance partial pressure discrete magnitude signal analog circuit, when discrete magnitude acquisition circuit passageway switches to discrete magnitude signal analog circuit, this another multichannel miniature relay action simulates discrete magnitude effectively, invalid two kinds of states respectively, waits that the controller accomplishes the collection and the trouble judges the back, and two multichannel miniature relay release resume initial condition.
2. The discrete quantity acquisition power-on BIT self-detection circuit as claimed in claim 1, wherein the discrete quantity acquisition channel switching circuit comprises a diode D1 and a multi-channel micro relay K1, wherein the anode (pin 1) of the diode D1 is connected with the cathode (pin 2) of the control coil of the multi-channel micro relay K1, and the cathode (pin 2) of the diode D1 is connected with the anode (pin 1) of the control coil of the multi-channel micro relay K1; a normally closed point 3 pin and a normally closed point 6 pin of the multi-channel micro relay K1 are connected, then the multi-channel micro relay K1 is connected with an internal power ground, and then the multi-channel micro relay K1 is connected with a pin 4 and a pin 7, and then the multi-channel micro relay K1 is connected with a detected object, namely a pin 2/4/6 of an optical coupler OP2 in the discrete quantity acquisition circuit and used for controlling the switching between the effective and the ineffective of discrete quantity signals of the power;
The discrete magnitude signal analog circuit comprises a diode D2, a multi-channel micro relay K2 and resistors R1-R2, wherein the anode, namely a pin 1, of the diode D2 is connected with the cathode, namely a pin 2, of a control coil of the multi-channel micro relay K2, and the cathode, namely a pin 2, of the diode D2 is connected with the anode, namely a pin 1, of the control coil of the multi-channel micro relay K2; one pin of the resistor R1 is connected with a 28V power supply, the other pin of the resistor R1 is connected with the 4 pins of the multi-channel micro relay K2, one pin of the resistor R2 is connected with the 4 pins of the multi-channel micro relay K2, the other pin of the resistor R2 is connected with 28V ground, and the R1 and the R2 are used for forming a level value consistent with the external discrete quantity to be acquired through voltage division; the 7-pin 28V ground of the multi-channel miniature relay K2 is used for simulating discrete quantity signals.
3. The discrete quantity acquisition power-on BIT self-detection circuit according to claim 2, wherein the normally closed point pin 9 and the normally closed point pin 12 of the multi-channel micro relay K1 are connected with an external alarm discrete quantity signal; a normally open point 11 pin and a normally open point 14 pin of the multichannel micro relay K1 are connected with a normally open point 5 pin of the multichannel micro relay K2, namely an internal analog discrete magnitude signal source; a pin 10 of the multi-channel miniature relay K1 is connected with a pin 5 of an optical coupler OP1 in the discrete quantity acquisition circuit, and a pin 13 of the relay K1 is connected with a pin 7 of an optical coupler OP 1.
4. The discrete magnitude acquisition power-on BIT self-detection circuit according to claim 3, wherein the normally closed point 15 pin and the normally closed point 18 pin of the multi-channel micro relay K1 are connected with an external automatic control discrete magnitude signal; a normally-open point 17 pin and a normally-open point 20 pin of the multichannel micro relay K1 are connected with a normally-open point 8 pin of the multichannel micro relay K2, namely an internal analog discrete magnitude signal source; 16 feet of the multi-channel micro relay K1 are connected with 2 feet of the optical coupler OP1, 19 feet of the multi-channel micro relay K1 are connected with 4 feet of the optical coupler OP1, and the diode D1 is a rectifier diode and is used for releasing reverse electromotive force of a coil when the multi-channel micro relay K1 is powered off.
5. The discrete magnitude acquisition power-on BIT self-detection circuit according to claim 2, wherein the R1 and R2 resistances are selected according to a discrete magnitude signal high level value to be simulated.
6. The discrete quantity acquisition power-on BIT self-test circuit as claimed in claim 2, wherein the multi-channel miniaturised relay K1 is a multi-contact miniaturised relay.
7. The discrete quantity acquisition power-on BIT self-detection circuit according to claim 2, wherein the multi-channel micro-relay K2 is a multi-contact micro-miniature relay.
8. The discrete quantity acquisition power-on BIT self-detection circuit as claimed in claim 2, wherein the diode D2 is a rectifier diode and is used for realizing the release of coil back electromotive force when the multi-channel miniature relay K2 is powered off.
9. The power-on BIT self-test circuit for discrete magnitude acquisition of claim 5, wherein R1 is selected to be 1.8K Ω.
10. The discrete quantity acquisition power-on BIT self-detection circuit according to any one of claims 1 to 9, wherein the discrete quantity acquisition power-on BIT self-detection circuit is applied in a lubricant temperature controller.
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