"What's the problem?"

Yang Weining simply came to the desk in the computer room, reopened the technical manual of DJS130, pointed to the power circuit diagram on it and said, "Lu Suo, Li Suo, Director Gu, you can come and take a look." Pen, fun, pavilion www. biquge。 info”

The crowd gathered together.

Yang Weining said: "According to the description in the technical manual, the DJS-130 is designed to ensure the automatic restart function after the power failure. The engineers set up a special signal generator at the power supply, which can generate three control signals, which I call A/B/C. These three control signals have such functions respectively, the A signal can be when the grid voltage is lower than 80% of the nominal value, that is, when the 35 volt DC voltage drops to 23 volts, the signal becomes low, triggering the host power power failure trigger, interrupting the program that the host is executing. The B signal drops from high to low when the memory power supply is not working reliably. The C signal is re-energized after any of the two sets of power supplies are below 4.5 volts, so that the monostable trigger on the printed circuit board generates a total clear pulse. ”

"It stands to reason that this automatic restart function designed for sudden power interruptions is relatively perfect, but the computer engineers forgot about a problem when designing this computer. If the AC voltage of the power grid jumps suddenly, the 35 volt voltage of the A signal drops exponentially for a period of time, triggering the host power failure trigger, and stopping after the power failure program, but before the C signal becomes low, the voltage suddenly returns to normal, so that because the power supply power failure trigger has been triggered, and the monostable trigger on the printed circuit board cannot produce a total cleaning pulse, it is easy to cause the machine to fail to restart. ”

"The experiment I asked Chen Gong to do is to detect the ratio of the time it takes for the A signal to drop and trigger the brownout trigger to the time it takes for the C signal to turn low to produce a total clear pulse, as long as this ratio is less than 0.5, there may be the situation I said. ”

"I see, I see!"

Yang Weining's explanation is easy to understand, not to mention electronic professionals such as Gu Pei and Chen Liangwei, even Lu Yang and Lu Wenjun have also understood.

In fact, this is not a particularly difficult problem, the key is that this problem is in a blind corner of thinking, it is very simple to think of, if you can't think of it, you may not be able to understand it for a lifetime.

But the crux of the matter is that from Yang Weining's arrival at the computing center, to watching the technical manual of DJS-130, to discovering this problem, it probably doesn't add up to more than 20 minutes.

That's a bit scary.

Gu Pei and they studied for a week, and they didn't even understand what was wrong with DJS-130, so they were solved by this young man in just twenty minutes?

Most of you here are experienced engineers, so you know how rare it is to do this.

This not only means that this young man is amazingly talented, but more importantly, it also means that Yang Weining has a very deep accumulation in the field of electronic and electrical technology.

Oh, by the way, everyone almost forgot that Yang Weining seemed to have made a military order, saying that he would write a set of CAD software within a month.

If Yang Weining also has such strength in the field of programming, it is really possible to realize this plan!

For a while, everyone's gaze at Yang Weining became weird.

Where did this bego come from!

Gu Pei shook his head, calmed down his complicated and indescribable emotions, and said: "Xiao Yang, I lost, I apologize to you for what I said just now, I didn't expect you to have such a deep accumulation in the field of electronic technology, I really believe that you can independently develop a CAD software system." How about it, are you interested in working in the computing center, and you can use the computers here as you like in the future. ”

Although Gu Pei has a bad temper, he is quite atmospheric, and he apologizes when he should apologize, without the slightest hesitation.

What made Yang Weining even more speechless was that this guy had just angered himself once, and in a blink of an eye, he could pull down his face and attract himself.

"Hey, Lao Gu, what do you mean by this, Wei Ning said that he would come to our No. 7 project team. ”

Lu Yang naturally stopped doing it, and hurriedly stepped forward to reason with Gu Pei.

Gu Pei said: "Old road, with Xiao Yang's ability in the field of electronics, he goes to your project team every day to draw pictures, isn't it a waste of talent?"

"Who said that it is a waste of talents, doesn't Wei Ning have to write CAD software next? When this set of software is written, the fields of avionics and flight control are completely enough for him to give full play to his expertise. ”

Chen Liangwei interjected.

"Okay, okay, don't give me nonsense, I haven't asked Xiao Yang's opinion yet. ”

Lu Wenjun stopped this battle in time.

Gu Pei changed his smile and said: "Yes, yes, we haven't asked Xiao Yang's opinion yet, Xiao Yang, what do you think? Our computing center is the department with the best office conditions in the institute, and there is an air conditioner to blow on a hot day, do you want to consider it?"

Yang Weining was defeated by Director Gu, who turned his face like a flip book, and said with a smile: "Director Gu, our bet doesn't seem to be finished yet, I said that we have to repair this machine to win, besides, if it can't be repaired, I don't have a machine to write CAD software." ”

Gu Pei didn't expect that in a short period of time, Yang Weining not only found out the design flaw of the DJS-130, but even thought of a solution, and was surprised: "Do you have a way to solve this flaw?"

Yang Weining said: "This is not a problem, we only need to add a timing control circuit to solve this problem." First, as long as the A signal becomes low, then the B signal and the C signal must also be turned low, and the A signal must not be turned high again until all three are low. Second, when the three signals of A/B/C are the first level, the C signal changes from low to high, then the B/A signal must also change to high level one after another. ”

Gu Pei lowered his head and thought about it for a while, and quickly recognized Yang Weining's plan, and said: "This method is good, simple and convenient, and there is no need to ask for help from the original factory, we can solve it ourselves." ”

This time, everyone was not as surprised as before.

Since Yang Weining can see the design flaws of this circuit in a short time, it is reasonable to come up with a solution.

It's just that this once again reflects Yang Weining's technical skills in the field of electronics.

Gu Pei said: "Xiao Chen, you can design a set of timing circuits as soon as possible after completing the power control circuit detection according to what Xiao Yang just said." ”

"Understood, Director Gu!"