Chapter 538: Be Strong, and Be Small
The Citigroup YF-22 can defeat the YF-23 and become the first mass-produced fourth-generation aircraft, relying on its stability. Even though the YF-22 uses so many black technologies that are considered by other countries, such as LPI radar, stealth coating, stealth aerodynamic shape that can supercruise and binary vector engines, etc., but compared with the YF-23, it is really It's very stable and relatively conservative.
Oh, by the way, there is also the lift-to-drag ratio of 2.0, this one doesn’t count!
——Complaints from a certain country.
So the mechanical department of Guangyang Factory did not play tricks or be ingenious. It honestly produced the photoelectric encoding disk in accordance with Gao Zhendong's requirements.
There were no problems with the optoelectronic and mechanical parts, so Gao Zhendong turned his attention to the signal reading and output circuit.
Signal amplification, shaping, pulse output...
Gao Zhendong nodded while watching, which also made the comrades in Guangyang Factory feel a lot more at ease. It seems that Mr. Gao is very interested in our work. Still satisfied.
Gao Zhendong quickly finished reading the signal circuit and raised his head.
"Well, the overall job is well done. Most of the things that should be considered in the entire circuit have been taken into consideration. Please note a few places and modify them."
Mr. Yang immediately turned the notebook to a new page: "Mr. Gao, please tell me."
"First of all, the amplifier device should not use electron tubes, use transistors. Now the output of transistors I’m still relatively optimistic. If you’re worried about insufficient supply of raw materials, you can contact me.”
I don’t know if it’s due to design inertia, unfamiliarity with transistors, or fear of insufficient transistor production capacity. In short, the comrades of the Gwangyang factory, In the signal amplification part, vacuum tubes were used, and Gao Zhendong decisively requested to replace them. It was not a power amplifier, and he was still pursuing boldness.
The biggest use of transistors - DJS-59 is now only for export, and the pressure is less. With the increase in 1274 production capacity and the ease of raw material supply, it is no problem to squeeze out some.
While agreeing, the comrades of Guangyang Factory secretly admired Gao Zhendong. Mr. Gao was trying to save face for us. In fact, we were just used to it, and we didn’t expect the transistor output to be so long-term.
As for the benefits of replacing electron tubes with transistors, they also know it, and even if they are far away, just being strong and reliable is enough.
After saying this, Gao Zhendong pointed to several locations on the circuit: "Here, here, add a capacitor. It doesn't need to be too big, just 104."
Comrades from Guangyang Factory I don’t quite understand Gao Zhendong’s intention: “Mr. Gao, what are the uses of these capacitors? We don’t know much about this, please give us some guidance.”
Opportunities are rare, so just ask, there is no shame in it .
"Anti-interference, if there is a high-power inductive load running nearby, its alternating electromagnetic field will easily produce induced electromotive force on the line, which will become a signal output once amplified. Using capacitors for filtering can greatly Swallow these small interference signals.”
"Inductive load?"
There is no need for Gao Zhendong to answer, Mr. Yang glanced at his friend: "Motor!"
Oh, I understand, there is a motor in the use environment of the photoelectric encoder. Don't be too normal.
"Can we use a larger capacitor? Mr. Gao." Bigger is better.
“No, it’s too big and swallows up normal signals. Judging from the characteristics of this circuit, 104 is enough.”
There are advantages and disadvantages, and applied research is often a process of trade-offs.
“I understand, thank you, Mr. Gao.” The young comrade from Guangyang Factory wrote it down happily.
Gao Zhendong pointed to the signal output part again, which is also an area that needs major changes.
“Here two transistors are used as a bistable circuit to achieve state flipping and shaping. Now this direct shaping is not good.”
Bistable circuit? Mr. Yang was confused now.
Gao Zhendong took out a pen and paper and drew a circuit diagram on the paper.
If there is a NAND gate, two NAND gates can make a bistable circuit. But if you don’t have one, you can also make it. Just two transistors will do. In fact, they are all the same principle. Gao Zhendong didn’t do it. Digital circuits The idea of digital circuits, SZ61XXX, hasn’t been developed yet, so we can’t just wait and see.
While drawing pictures, Gao Zhendong explained the principles, states, truth tables and other related knowledge of bistable circuits to the comrades in Guangyang Factory.
“Using this circuit, firstly, can further ensure the reliability of flipping, and secondly, it can also resist interference to a certain extent.” After explaining, Gao Zhendong pointed to the circuit diagram and summarized the reasons why this circuit is used here. .
Mr. Yang looked at the piece of paper in front of him and felt that he had gained a lot: "Well, I understand. This circuit can indeed ensure the reliability of flipping, but please explain to us the anti-interference in detail. .”
Gao Zhendong pointed to several calculation formulas and said: "If a bistable circuit wants to flip, the incoming signal must meet certain requirements."
After speaking, he clicked on the two core transistors: "Either the signal polarity must ensure that the saturation tube exits the saturation zone, or the polarity must ensure that the cut-off tube exits the cut-off zone. At the same time, the amplitude of the pulse signal that triggers it must be large enough and the pulse width must be wide enough." Mr. Yang After thinking for a while: "Ah, it turns out that the signal's positive and negative, carrying energy, and action time must not be missing, so as to ensure the flip. In this way, it is more difficult for the interference signal to meet these requirements at the same time, and it is impossible to This flipped the circuit, further ensuring the accuracy and reliability of the output.”
Mr. Yang is also a technician with many years of experience. He may not have as many tricks as Gao Zhendong, but he has basic skills. It was solid and I figured it out in no time.
“By the way, you add peak clipping after the output to control the signal level at +5V. It is possible to add digital circuits for control in the downstream stage of this signal. There must be a unified Level.”
"Okay, Mr. Gao." It's not that they didn't think of this, it's mainly that they didn't know how much to cut.
After reading this, I learned about other aspects of the photoelectric encoder, and there is no big problem.
After the matter was discussed, Gao Zhendong sent them away. The comrades in Guangyang Factory also knew that Gao Zhendong was very busy. Today, they were able to solve many hidden dangers of the photoelectric encoder being susceptible to interference, and determined the signal output standard. Gains It's already huge.
Gao Zhendong returned to the office, looking at the overall plan of the second-generation tank on the computer in front of him, and suddenly remembered something, or to be precise, two things.
He immediately grabbed the phone and called the gatekeeper of the third rolling mill.
Mr. Yang and his party were in high spirits and were walking outside the gate of the third rolling mill. They didn't have a car to bring them here, so they had to stretch their legs to take the bus and then the train.
As soon as I reached the gate of the third rolling mill, I was stopped by the guard.
"Comrades from Guangyang Factory, please wait a moment." The advanced skills of the door guard - among tens of millions of people, he can recognize at a glance someone who is not from his factory. If he has entered through his own place, it will be even more difficult. It's a piece of cake.
"Hello comrade, is there anything we need to cooperate with?" Mr. Yang and the others stopped.
"That's it. Mr. Gao from the third factory just called and asked you to go back. There is something I need to discuss with you."
"Ah, ok, ok, thank you!" After hearing this, Mr. Yang decisively led the team to turn around and return without any sign of being tormented.
"Mr. Yang, you said Mr. Gao asked us to go back. What's the matter?" An employee was a little confused.
Mr. Yang thought it through: "It must be a good thing. It is probably something he just remembered and is not within the scope of this topic. He has many things to do, and he can think of them so quickly. We're lucky, just take two steps and don't keep him waiting."
It took a while for Mr. Yang and his group to return to the reception room of the third factory to go through the formalities for entering for the first time. When they left the gate of the No. 3 Factory, it had already failed. The guard of the No. 3 Factory called Gao Zhendong to let it in.
Gao Zhendong was sitting in the reception room waiting for them. When he saw them coming in, he looked embarrassed: "Sorry, sorry, comrades, I just remembered when I returned to the office that there is something suitable for you to do, so I had to do it. Thank you for coming back.”
Look, Mr. Gao is so polite.
“No hard work, no hard work, just talk if you have anything to do.” Mr. Yang said with a smile.
Is there something suitable for us to do? Look, isn’t this what’s going on, haha.
It is indeed correct to report more work.
Gao Zhendong didn't waste any words. After expressing his apology, he immediately stated his request.
"It's still a photoelectric encoder, but these two types of photoelectric encoders are quite special."
Mr. Yang was very happy. It's still a photoelectric encoder, so the configuration of his own factory's existing technical strength is basically sufficient, and any product with If the word "special" is used, it means that the purpose is either very special or has high requirements. These are good projects that can produce results.
And there are two kinds! The technical department of Gwangyang Factory has solved its workload for the next year.
And with Chief Engineer Gao taking it with him, he will definitely be able to keep it under control, and there will be no embarrassment like exposing his butt when he wants to show his face.
"Great! Mr. Gao, tell me if you have any requirements."
"This first type, based on the existing encoder, has two requirements, that is, it is strong! It must work in a high temperature and vibration environment, which requires extremely high reliability in this case. At the same time, the size cannot It’s too big. You should go back and consider the specific size requirements. I will contact you later.”
No wonder the first thing Mr. Gao did when he came up was to replace the electronic tube. No one can bear the vibration, or the surrounding things can't bear it.
"Okay, Mr. Gao." Mr. Yang carefully wrote down Gao Zhendong's request.
“The second one, there is only one requirement, small! The resolution does not need to be high, 3 digits is enough, and the zero mark can also be removed, but the photoelectric code plate part cannot exceed 1 cm square. Really There is no way to relax the maximum width to 1.5 centimeters. The signal recognition output circuit must be as small as possible. By the way, this thing must be used at least two times at a time. From this perspective, you can consider sharing some things in the signal circuit part.”
< br>3-digit precision refers to 3-digit binary. Translated, it means that it can output 8 signals in one turn. At worst, it can use small gears for acceleration.
(End of this chapter)