"Wensu, you mean, the old man in your neighborhood is the eighth-level worker in your factory." Fu Xin asked in surprise. He didn't expect that he had sat in that eighth-level worker's house, but he didn't feel the aura of a scholar at all from the old man.

Wen Su said undeniably: "Of course, Director Fu, although I can't compare to you, I am also a serious fifth-level worker who has passed the country!" It's because of the guidance of Old Man Huang! ”

"That's right!" Wen Su is a fifth-level worker at a young age, there must be a reason, but I didn't expect the reason to be here. "By the way, is Old Man Huang easy to talk to?" Fu Xin asked.

Wen Su nodded, shook his head again, and said: "Old Man Huang is usually very talkative, and I am also half of his apprentice, but if I want to leave, he won't say a word." But if you want him to go, it's impossible, he will be very stubborn to stay and accompany this factory to its demise. Because of our factory, the hard work he has put in it is too much! He can't demand from others, but he will be strict with himself. ”

"Well, alas, forget it." said that Fu Xin really didn't want to get the eighth-level worker of Old Man Huang, that was fake, no matter how he came and went, he still had thoughts about Old Man Huang. The eighth-level workers are all national treasures that can not be found!

"Wait, level 7 worker...... Eighth-level worker, electronics, Xunyang, surnamed Huang, Comrade Wen, is the eighth-level worker you are talking about called Huang Hua? Lu Xuan, who was sitting next to the army, suddenly put down the chopsticks in his hand and asked Wen Su excitedly.

Before Wen Su could answer, the army grabbed Lu Xuan's lotus-like white and fragile arm first, and asked, "Sister, do you mean that Uncle Huang who hugged the two of us when he was a child, my father's teacher?" ”

Wen Su replied: "It's called Huang Hua!" Do you know Mr. Huang? ”

The army replied: "I'm afraid so, the situation you said is all worthy of our Uncle Huang!" ”

"Is there such a thing?" Fu Xin and Liu Yi looked at each other a little, and Fu Xin also thought: "Could this be the halo of the legendary protagonist?" Whatever you want, what! ”

Lu Xuan asked Wen Su expectantly, "Comrade Wen, can you take us to visit Uncle Huang in a while?" The army is still a little unsure, but Lu Xuan is already completely convinced.

"It's no problem to take you over, but if I say I'll take you over in a while, I can't decide this, you should ask Director Fu first." Wen Su replied.

Fu Xin immediately smiled and said, "I'm sure there's no problem!" I can't ask for a visit to Mr. Huang! ”

……

Old Man Huang's wife opened the door and saw that it was Wen Su, and immediately welcomed: "Oh, it's Wen Su, come in, and these friends of yours, come in too!" It's cold outside! ”

Since it was a visit, I couldn't do without something, Fu Xinzhi carried a basket of eggs bought from the self-employed on the side of the road, and when he saw Mr. Huang's wife, Fu Xin immediately handed this basket of eggs to Mr. Huang's wife, and said: "Auntie, I came in a hurry last time, I didn't bring a gift, this time I came to see you and Mr. Huang, and I bought a few eggs with Wensu and gave them to you." ”

"You kid, why are you like this, come to my house and bring gifts, take them back, we don't want them!" Mr. Huang is a man of integrity, in the past few days, I have heard some things about Fu Xin digging people in this Xunyang Electronics Factory, and now this Fu Xin is so enthusiastic to bring a basket of eggs, which is not blind to Mr. Huang. So he was a little angry, and his tone was very unkind.

"Uncle Huang, it's really you!" Fu Xin didn't answer, but the two of them on the side, Lu Xuan and Lu Xuan, had already shouted out in unison, Lu Xuan was even more emotional, his voice contained crying, and tears crossed his cheeks, leaving a crystal trace.

"You are...... You are Lu ...... No, you are not Lu Chaoyang, you are his son, you are ...... Are you his daughter? When Old Man Huang heard him shouting, he first stopped being angry, glanced at Lu Lu and Lu Xuan, didn't see it too clearly, and immediately picked up his reading glasses again, on the bridge of his nose, squinted at Lu Lu and Lu Xuan, and gradually remembered who they were.

"Well, Uncle Huang, do you remember our ......" After all, Lu Lu was a man, and his tear ducts were not as developed as Lu Xuan's, so he endured the excitement and sadness in his heart and replied.

"It turned out to be you, is your father and mother okay? Back then, I was useless, I couldn't completely protect your parents, and let you go to the countryside to suffer. Old Man Huang said with emotion.

The army did not hide it, and said directly and frankly: "Uncle Huang, don't say that, if you hadn't fought hard to keep us back then, maybe we would never see you again!" ”

"Don't talk about that!" Obviously, Old Man Huang didn't want to mention the painful experience back then, so he immediately changed the topic and asked Lu Lu and Lu Xuan: "Are your parents okay, if they are willing to go back to that research institute, I can intercede for them, clear their grievances, and return to their original position!" ”

The army said sadly: "My father and mother have been dead for a few years......

Old Man Huang scolded the four scourges, and then said: "I don't know how many people were killed in that big turmoil, you two are the third batch of orphans I know!" But don't be sad. Now that the country is becoming more and more stable, there should be no more such things in the future, your parents' grievances, I don't know if they have been washed away, if not, I will help the two of them wash away, but I can't be a ghost who died unjustly. ”

The army now has some city governments, but he didn't answer, but Lu Xuan on the side had been looking forward to clearing his parents' grievances for a long time, and immediately replied: "Not yet...... Because we can't provide valid evidence. ”

"Don't worry, I'll help you do this! These are the ...... of doing things," Old Man Huang said indignantly, he didn't expect that after so many years, the grievances of the army's parents have not been washed away. However, he didn't dare to comment much on the efficiency of the government, seeing that there were outsiders.

"Uncle Huang, this basket of eggs also has a part of us, please accept it!" Seeing Fu Xin still embarrassedly carrying a basket of eggs, the army stood there and immediately relieved Fu Xin.

Old Man Huang's impression of dealing with Xin is not very good, because Fu Xin has done things in the past few days, which really makes him dislike, so he said angrily: "Okay, you put it down and sit down!" ”

The army immediately introduced Mr. Huang: "Uncle Huang, this is the director of our Huaxing Electronics Factory, Fu Xin, this is the chief of the security section of our Huaxing Electronics Factory, Liu Yi, and he is also a good friend of Comrade Wen. Director Fu helped me and Xiaoxuan a lot, so that the two of us got out of poverty, now I am an eighth-level worker in Huaxing Electronics Factory, and I am also the workshop director, and my sister is the assistant to the factory director! ”

The army specially mentioned his identity in Huaxing Electronics Factory, according to his childhood, Mr. Huang had a good impression of their family, and Fu Xin's help to him and Lu Xuan should be able to help Fu Xin save a little impression points.

Sure enough, Old Man Huang's face softened a lot, and he no longer treated Fu Xin with the same disgust as before, but Old Man Huang still had questions: he asked the army: "Are you an eighth-level worker?" ”

The army knows that the content of the novel is wordy enough, and the author is already trying to change it, and if he explains this problem word by word in several chapters, then the anger of the readers will also kill him without the author killing him, so the army chooses to say it again at a super fast pace.

"You mean, you came to Xunyang this time because you encountered a bottleneck in the process of researching bidirectional thyristors. You factory director Fu took you out to relax and relax your tense spirit? Old Man Huang asked.

Fu Xin is now sitting on pins and needles, and he is also smiling bitterly in his heart, sighing that he is too reckless, and he acts rashly without detailed investigation, in this matter, he is really wrong!

"Yes, I'm having problems with making it in either direction." The army is a technocracy, and when it comes to technology, he feels his blood boiling all over his body.

"I have some research experience with bidirectional thyristors. Let me ask you, do you know why a dual-yang thyristor can be turned on in either direction? "Mr. Huang is also a technician who has been a technician all his life, and when it comes to technology, he is also very interested.

The army replied: "I know, this is due to the symmetry of the forward and negative characteristics of the bidirectional thyristor. ”

"Looks like you still know something, yes!" Old Man Huang exclaimed: "However, have you mapped out a few special data on the volt-ampere characteristic curve of the bidirectional thyristor you studied?" ”

"Volt-ampere characteristic curves?" The army couldn't help but pat his head and said: "It seems that I have been really busy these days, and my mind is a little confused, and I have forgotten the stubble of the volt-ampere characteristic curve, and I have been working the structural diagram, working principle and characteristics of this bidirectional thyristor." ”

Old man Huang said with a smile: "You said that you are working the structure diagram and working principle of the bidirectional thyristor, and I will test you on the n-p-n-p-n structure of the bidirectional thyristor, and I will test the working principle of your bidirectional thyristor, and tell me the working principle and characteristics of the bidirectional thyristor!" ”

Army nodded and said, "Hmm! Bidirectional thyristors, like unidirectional thyristors, also have trigger control characteristics.

However, its trigger control characteristics are very different from those of a unidirectional thyristor, that is, no matter what polarity voltage is inserted into the anode and cathode, as long as a trigger pulse is added to its control pole, and no matter what polarity the pulse is, the bidirectional thyristor can be turned on.

Because the bidirectional thyristor has the characteristics of turn-on and turn-off in two directions, the bidirectional thyristor is essentially two unidirectional thyristors connected in anti-parallel, and is a semiconductor device with four PN structures and three electrodes formed by NPNPN five-layer semiconductors.

Since the structure of the main electrode is symmetrical (all of them are drawn from the n-layer), its electrodes are not called anode and cathode respectively like unidirectional thyristors, but the first electrode t1 and the second electrode t2 are called the ones that are close to the control electrode.

The main disadvantage of bidirectional thyristors is their low ability to withstand the rate of voltage rise.

This is because at the end of the triacistor conduction in one direction, the carriers in each layer of the silicon wafer have not returned to the cut-off position, and corresponding protective measures must be taken. Bidirectional thyristor components are mainly used in AC control circuits, such as temperature control, lighting control, explosion-proof AC switches, and DC motor speed regulation and commutation circuits. ”

Fu Xin, who has been unable to speak, and the bored Fu Xin found a topic at this time, it seems that the army is right, before studying the two-way thyristor, the one-way thyristor must be thoroughly eaten, otherwise there will be trouble. Sure enough, there is something wrong with the army now, Fu Xin said: "Brother Jun, you still missed a little."

Since the two main electrodes of the bidirectional thyristor are not positive or negative, there is no difference between the forward peak voltage and the reverse peak voltage in its parameters, but only a maximum peak voltage. However, you didn't draw a volt-ampere characteristic curve, so it's normal for this problem to occur. ”

Old Man Huang glanced at Fu Xin unexpectedly, but he didn't expect Fu Xin to understand this, Old Man Huang thought in his heart: "It seems that this kid has sat in the position of factory director at a young age, and he is really capable!" ”

However, he still didn't deal with the new impression very well, and just said lightly: "I didn't expect you to understand, that ......"

Seeing that the situation was not right, the army immediately interjected to relieve Fu Xin's siege and said: "Uncle Huang, Director Fu is very good, his technology is definitely the first in our factory, but he usually works too much and doesn't put all his energy on research and development." ”

Old Man Huang was a little dissatisfied with the army interrupting him, but he understood what the army meant, so he didn't ask the previous question, but said unhappily: "Don't do your job!" ”

Fu Xin was embarrassed, he knew that this old man Huang was going to test him, he was not afraid of this at all, and he wanted to let Master Huang further change his impression of himself, but he didn't expect the army to be amorous and help him out of the siege, which was a disservice. These basic knowledge, if Fu Xin is tested, it will really be impossible to match the old man in front of him!

However, the clay man also had three points of anger, and was embarrassed by this old man three times and twice, Fu Xin finally couldn't help it, so he deliberately found a difficult problem and asked the old man Huang sincerely: "Old man, I have heard of an English abbreviation called IGBT, the full name is insulated_gate_bipolar_transistor insulated gate bipolar transistor, it is composed of BJT, bipolar transistor and MOS, The composite fully controlled voltage-driven power semiconductor device composed of insulated gate MOSFET has the advantages of high input impedance of MOSFET and low on-voltage drop of GTR.

But I have not understood its working characteristics, why it is divided into static characteristics and dynamic characteristics, static characteristics mainly include volt-ampere characteristics, transfer characteristics and switching characteristics, dynamic characteristics I only know one, is the IGBT in the process of turn-on, most of the time is run as a MOSFET, but in the later stage of the drain-source voltage UDS drop process, the PNP transistor from the amplification area to saturation, so a delay time is added. I would like to ask you, do you know why the working characteristics of this IGBT insulated gate BJT transistor are like this? (To be continued.) )