CN109861668B - High-reliability button instruction pulse circuit - Google Patents
High-reliability button instruction pulse circuit Download PDFInfo
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- CN109861668B CN109861668B CN201910074845.8A CN201910074845A CN109861668B CN 109861668 B CN109861668 B CN 109861668B CN 201910074845 A CN201910074845 A CN 201910074845A CN 109861668 B CN109861668 B CN 109861668B
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Abstract
The invention discloses a high-reliability button instruction pulse circuit, which comprises a button signal generating circuit, an RC filter circuit, a monitoring circuit, an RC timing circuit and a monostable circuit, wherein the button signal generating circuit is connected with the RC filter circuit; the button signal generating circuit is used for generating a button voltage signal; the button voltage signal is output to an RC filter circuit through a diode, is input into a monitoring circuit through a PFI pin of the monitoring circuit after being filtered by the RC filter circuit, is subjected to signal shaping after voltage comparison and is output from a PFO pin of the monitoring circuit, is input into the monitoring circuit through the monitoring circuit/MR pin to remove jitter, and generates a pulse signal after the jitter is removed; the pulse signal is output through a monitoring circuit/REST pin, is input into a monostable circuit through a monostable circuit B pin, generates a positive pulse signal of a preset pulse width instruction, and the instruction positive pulse signal is output through a monostable circuit Q pin; the RC timing circuit is connected with the monostable circuit and used for determining the pulse width of the command positive pulse signal. The method has the advantages of no occupation of the running time of the processor, low cost, high reliability and long service life.
Description
Technical Field
The invention belongs to the field of pulse circuits, and relates to a high-reliability button instruction pulse circuit.
Background
In the current third step space station and ChangE moon cabin of strategy policy for developing manned spaceflight in China, the spacecrafts, especially the space stations, need to be equipped with electronic equipment operated by a plurality of manual control buttons of the spacemen, because the reliability of any component of the manned spacecrafts is related to the life safety of the spacemen and the success or failure of the flight mission, the spacecrafts need to have very high reliability, but the spacecrafts can be impacted and vibrated in the space launching and flying processes, and can also be subjected to space high-energy ion irradiation and electromagnetic wave interference, the buttons have long-time mechanical shaking in the pressing process, the influencing factors are far more complex than the ground environmental factors, and therefore, in order to ensure that correct button command pulse is reliably sent for a long time, a high-reliability button command pulse circuit is needed to be designed.
The button signal waveform is shown in fig. 1 and consists of three parts: the jitter time of the leading edge, the jitter time of the stable edge and the jitter time of the trailing edge, continuous signal pulses are generated by one-time pressing, and the signal pulse time is not fixed (the jitter time of the leading edge or the trailing edge is about 5 ms-10 ms, and the stable time is about hundreds of milliseconds to seconds). Button shake elimination and pulse generation methods in civil equipment are various and have very low price, but the methods have no capacity of resisting space high-energy ion irradiation, are easy to be influenced by a single event effect to break down or even damage in a space environment, and cannot be directly applied to space manual control equipment. In order to ensure high reliability, referring to fig. 2, there are two methods for generating a button command pulse in the current space manned aerospace hand control device. The method comprises the following steps: the main components are RC filtering, HC14 inverter waveform shaping, processor software for button signal jitter elimination and identification, processor software or hardware circuit for directly generating fixed pulse command. However, it takes a lot of time for the processor to remove jitter, recognize or generate instructions, so this method is not suitable for electronic devices without processor and requiring high real-time performance of the processor; the second method comprises the following steps: the main components are RC filtering, HC14 inverter waveform shaping, FPGA for button signal jitter elimination, identification and generation, the method is simple, and the processor time is not occupied. However, aerospace-grade FPGAs are extremely expensive, can reach tens of thousands of dollars, and are difficult to purchase, and therefore, this approach is not suitable for use in low-cost space electronics.
With the rapid development of manned aerospace technology in China, the two traditional space button instruction pulse generating circuits cannot meet the requirements of space manned aerospace application more and more.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned disadvantages of the prior art and to provide a highly reliable button command pulse circuit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a high-reliability button instruction pulse circuit comprises a button signal generating circuit, an RC filter circuit, a monitoring circuit, an RC timing circuit and a monostable circuit;
the button signal generating circuit is used for generating a button voltage signal and comprises a button and a diode, wherein one end of the button is grounded, and the other end of the button is connected with the diode;
the button voltage signal is output to an RC filter circuit through a diode, is input into a monitoring circuit through a PFI pin of the monitoring circuit after being filtered by the RC filter circuit, is output from a PFO pin of the monitoring circuit after voltage comparison and signal shaping are carried out through the monitoring circuit, and then is input into the monitoring circuit through a/MR pin of the monitoring circuit for jitter elimination, and pulse signals are generated after jitter elimination;
the pulse signal is output through a REST pin of the monitoring circuit, is input into the monostable circuit through a B pin of the monostable circuit, generates a command positive pulse signal with a preset pulse width, and the command positive pulse signal is output through a Q pin of the monostable circuit;
the RC timing circuit is connected with the monostable circuit and used for determining the pulse width of the command positive pulse signal.
The invention further improves the following steps:
the drive circuit is used for outputting drive current, and one control input end of the drive circuit is connected with a Q pin of the monostable circuit; the other control input is provided as a lock/unlock signal port for receiving a lock/unlock signal.
The monitoring circuit is a JR706RD monitoring circuit.
The jitter elimination time is 200ms.
The monostable circuit is an SN54AHC123A monostable circuit.
The driving circuit is an LB8169T driving circuit.
the/CLR pin of the monostable is set as a lock/unlock port of the monostable for receiving a lock/unlock signal.
The pulse width of the command positive pulse signal is 60-200 ms.
Compared with the prior art, the invention has the following beneficial effects:
the button signal generating circuit generates a button voltage signal, filtering is carried out for about 1ms through the RC filter circuit, a small jitter signal generated by the button is preliminarily filtered, the monitoring circuit is adopted to remove jitter of the button signal, and a command positive pulse signal is generated through the monostable circuit. The whole circuit is realized by pure hardware, and the time of tens of milliseconds to several seconds for the processor to perform button signal jitter elimination and instruction identification is not occupied, so that the real-time performance of the whole button instruction pulse circuit is greatly enhanced; the circuit is simple in structure, consists of a low-cost button signal generating circuit, a monitoring circuit, a monostable circuit, a resistor and a capacitor, does not need expensive aerospace-grade FPGA and very high aerospace-grade software design and management cost, does not need expensive aerospace-grade processor for intervention, and greatly reduces the circuit cost. The RC anti-interference filter circuit can completely resist electromagnetic interference, and the reliability of the circuit is strong. The circuit has wide application range, can be applied to an aerospace electronic system with a processor, and can also be applied to an aerospace electronic system without a processor.
Furthermore, the jitter elimination time is 200ms, the general button jitter time is about 5ms to 10ms, the jitter elimination time margin is about 190ms, and the jitter elimination requirement of the button voltage signal in the space instruction requirement can be completely met.
Furthermore, the/CLR pin of the monostable circuit and a redundancy control input pin of the command driving circuit are blocking/unlocking ports and are used for receiving blocking/unlocking signals, and when a command positive pulse signal needs to be output, the unlocking signal needs to be effective, so that the reliability of the circuit is further improved.
Drawings
FIG. 1 is a timing diagram of button voltage changes;
FIG. 2 is a schematic block diagram of a conventional spatial button command pulse generation circuit;
FIG. 3 is a schematic block diagram of a space button command pulse generating circuit according to the present invention.
Wherein: 1-a button; 2-a diode; r1, R2 and R3 are resistors; c1 and C2 are both capacitors.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 3, the high-reliability button command pulse circuit of the present invention includes a button signal generating circuit, an RC filter circuit, a monitoring circuit, an RC timing circuit and a monostable circuit.
The button signal generating circuit is used for generating a button voltage signal and comprises a button 1 and a diode 2, wherein one end of the button 1 is grounded, and the other end of the button 1 is connected with the diode 2; the button 1 is pressed by a finger to make and break the positive end of the diode 2 connected with the ground to generate a button voltage signal.
The button voltage signal is output to the RC filter circuit through the diode and filtered by the RC filter circuit. The RC filter circuit filters the button voltage signal for about 1ms, preliminarily filters out small jitter signals generated by the button 1, or filters out interference signals generated in the system for less than 1ms to avoid sending out error command pulses. The resistor R1 and the resistor R2 are connected in series and then connected with the capacitor C1 in parallel to form an RC filter circuit, and power is supplied by a 5V power supply; wherein R1=2K Ω, R2=10K Ω, and C1=0.2uF.
The monitoring circuit is a JR706RD monitoring circuit, a button voltage signal is input into the monitoring circuit through a PFI pin of the monitoring circuit after being filtered by an RC filter circuit, the button voltage signal is subjected to signal shaping after being compared by a voltage comparator inside the monitoring circuit in the monitoring circuit, then the button voltage signal is output from a pin of a PFO (Perfluorooctane sulfonate) monitoring circuit, then the button voltage signal is input into the monitoring circuit through the pin of the monitoring circuit/MR to be subjected to jitter elimination for 200ms, and a single negative pulse signal generated after the jitter elimination is output through a REST pin of the monitoring circuit.
The pulse signal is input into the monostable circuit through a pin B of the monostable circuit, the monostable circuit is an SN54AHC123A monostable circuit, an instruction positive pulse signal with a preset pulse width is generated, and the instruction positive pulse signal is output through a pin Q of the monostable circuit; the/CLR pin of the monostable is used for receiving locking/unlocking signals. A pulse signal output from a monitoring circuit/REST pin is input into a rising edge trigger pin B of a monostable circuit, when a blocking/unlocking signal of a/CLR pin is high, unlocking is carried out, a command positive pulse with fixed pulse width generated by triggering is output from a Q pin, and the command pulse width is generally 60 ms-200 ms; when the/CLR is low, the output of the positive pulse of the command is blocked, so that the unlocking signal is effective when the command needs to be output, and the reliability of the output of the command pulse can be further improved.
The driving circuit is an LB8169T driving circuit and is an OC collector open-circuit device with double redundant control ports. The command positive pulse signal from the Q pin of the monostable circuit controls one control end of the dual-redundancy output driving circuit, the other control pin of the driving circuit is used for receiving a blocking/unlocking signal, when the blocking/unlocking signal is high, unlocking is carried out, the OC door driving current is larger than 200mA, a relay can be directly driven, and the relay is a magnetic latching electromagnetic relay. The drive circuit is used for driving the magnetic latching electromagnetic relay coil to control the switch of the high-voltage load power supply.
The RC timing circuit is connected with the monostable circuit and used for determining the pulse width of the command positive pulse signal. According to a formula T ≈ R ≈ C, wherein R is resistance and has a unit of k Ω; c is capacitance with the unit of uF; the pulse width of the output instruction of the monostable circuit can be accurately determined by setting the values of the resistor R and the capacitor C.
An aerospace level processor monitoring circuit JR706RD is selected as a jitter elimination chip, and the characteristics of the jitter elimination chip are as follows: when the chip is powered on or after the chip is powered on, when the/MR pin inputs a negative pulse larger than 150ns, the/REST pin outputs a negative pulse of T +200 ms; if n negative pulses with interval time less than 200ms are continuously input to the/MR pin after power-on, the/REST pin outputs a single negative pulse with T +200 ms. When a button is pressed once, the/REST pin of the monitoring circuit JR706RD outputs a single negative pulse of T1+ T2+ T3+200ms, the jitter elimination time is 200ms, the jitter elimination time margin is 200ms-T1, referring to FIG. 1, the jitter elimination time of a general button is about 5 ms-10 ms, and the jitter elimination time margin is about 190ms, so that the jitter elimination effect of a space instruction requirement on the button can be completely met.
The button signal jitter elimination and command identification time is a time as long as tens of milliseconds to several seconds, and the real-time performance of the button command pulse circuit is greatly enhanced by adopting a pure hardware circuit to realize the button signal jitter elimination and command identification without occupying any precious running time of a processor. The RC anti-interference filter circuit can completely resist electromagnetic interference; jitter elimination of a large-margin hardware circuit; the output of the command pulse can be further reliably controlled through the blocking/unlocking port; all components are high-reliability aerospace-grade quality devices which can resist the irradiation influence of space high-energy ions. The method can be applied to an aerospace electronic system with a processor and an aerospace electronic system without the processor, and has a wide application range. The circuit is simple in structure and consists of a gate circuit with low price, a processor management chip, a monostable circuit, a resistor and a capacitor, and expensive aerospace-level FPGA and very high aerospace-level software design management cost are not needed; even an expensive aerospace-grade processor is not needed for intervention, so that the system cost is greatly reduced.
The device is successfully verified in space station microwave oven electric controller products, space station astronaut drinking water controller products and astronaut operating force measuring equipment products which are being developed in China, the devices are firstly assembled on space stations which are researched and developed in China and can provide beneficial reference for other electronic systems with manual buttons, and a button instruction pulse circuit which is realized based on pure hardware of aerospace-level components is provided with a hardware anti-interference circuit, a hardware jitter elimination circuit and a hardware instruction pulse generation circuit.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. A high-reliability button instruction pulse circuit is characterized by comprising a button signal generating circuit, an RC filter circuit, a monitoring circuit, an RC timing circuit and a monostable circuit;
the button signal generating circuit is used for generating a button voltage signal and comprises a button (1) and a diode (2), wherein one end of the button (1) is grounded, and the other end of the button (1) is connected with the diode (2);
the button voltage signal is output to an RC filter circuit through a diode (2), is input into a monitoring circuit through a PFI pin of the monitoring circuit after being filtered by the RC filter circuit, is output from a PFO pin of the monitoring circuit after being compared with voltage and shaped by the monitoring circuit, and is input into the monitoring circuit through a/MR pin of the monitoring circuit to eliminate jitter, and pulse signals are generated after the jitter is eliminated;
the pulse signal is output through a REST pin of the monitoring circuit, is input into the monostable circuit through a B pin of the monostable circuit, generates a command positive pulse signal with a preset pulse width, and the command positive pulse signal is output through a Q pin of the monostable circuit;
the RC timing circuit is connected with the monostable circuit and used for determining the pulse width of the command positive pulse signal;
the monitoring circuit is a JR706RD monitoring circuit;
the monostable circuit is an SN54AHC123A monostable circuit.
2. The high reliability button command pulse circuit according to claim 1, further comprising a driving circuit for outputting a driving current, wherein a control input terminal of the driving circuit is connected to the Q pin of the monostable circuit; the other control input is arranged as a lock/unlock signal port for receiving a lock/unlock signal.
3. The high reliability button command pulse circuit according to claim 2, wherein said driving circuit is an LB8169T driving circuit.
4. The high reliability button command pulse circuit according to claim 1, wherein the debounce time is 200ms.
5. The high reliability button command pulse circuit of claim 1 wherein the/CLR pin of said monostable is provided as a lock/unlock port of the monostable for receiving a lock/unlock signal.
6. The high reliability button command pulse circuit according to claim 1, wherein the pulse width of the command positive pulse signal is 60 to 200ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910074845.8A CN109861668B (en) | 2019-01-25 | 2019-01-25 | High-reliability button instruction pulse circuit |
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| CN201910074845.8A CN109861668B (en) | 2019-01-25 | 2019-01-25 | High-reliability button instruction pulse circuit |
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| CN109861668A CN109861668A (en) | 2019-06-07 |
| CN109861668B true CN109861668B (en) | 2023-03-21 |
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