Chapter 849 Genius, you can really break it!
No matter whether he is confused or not, testing the circuit is a meticulous job. The Russians still have to be busy with this first step in the Long March.
Several guests came from the 16th Research Office of the Institute of Electronics, and they were brought by the dean himself.
"Old Li, I'm bringing you a distinguished guest. Look, what good news did I bring to you." As soon as the president of the Institute of Electronics entered Director Li's office in the 16th Research Office, he said A happy smile.
"Oh, Comrade Dean, you think of supporting us. Thank you so much." Director Li didn't ask anything, and put the dean on the wall with a bunch of good words. Now, if you don’t get some practical benefits today, you will break your promises and become fat for your comrades below!
The dean was very confident about his virtue of hitting snakes and sticks: "Don't worry, it's definitely a good thing, it depends on you being unable to eat. If you are not capable, you can't blame me for not taking care of you."
Director Li immediately changed his face: "Don't worry, Dean, please make sure to complete the task!"
The dean, who was a little amused by his face-changing skills, introduced: "This It is Director Pan and Chief Engineer Cui of Factory 1218. This task is what they bring to you. If you want to thank you, you should thank them."
In fact, Director Li and Chief Engineer Cui know each other They are all technical and senior talents in the system. They have had a lot of dealings, but Director Pan is not familiar with him, and the dean cannot introduce only one, just as he doesn't know him. "Oh, thank you so much. Come on, sit down, drink tea." You don't even give you a task, right?
Several people sat down, but the dean did not leave. He still had to take charge of Director Li's helm such matters involving multiple units. If there is one, if Director Li is hard to say, there would be no problem with him saying it.
"This is the thing. We received several tasks from Chief Engineer Gao, one of which we felt very compatible with your unit. If we didn't invite you in, it would be a pity. So we and Chief Engineer Gao discussed it and he thought it was good, so we disturbed him. "
Director Pan talked about the matter first, and the information was very rich.
The matter is from Chief Engineer Gao, but the recommendation is from us, and it is agreed by General Gao.
"General Engineer Gao? Is that General Engineer Gao?" As soon as he mentioned this name, Director Li's spirit immediately came up. No, I have to confirm it, otherwise I would be in vain.
Chief Executive Cui smiled and said, "Yes, it's that Chief Executive Gao." If you don't take the unit, who can I say Chief Executive Gao, who else can I have? It must be him. "Oh, thank you so much for the two leaders. I did this. Director Pan and Chief Engineer Cui, you have brought me great news." No questions asked Thank you first. These two people are higher in level than him, so it’s not surprising to call him leader.
He has never dealt with Gao Zhendong, but he has seen him many times at the Lightning Technology Awards, but he has no communication, but he is very famous in the Twelve Machinery Department.
Director Li knew very well that as long as it was a topic from Chief Executive Gao, there would be no small-scale quarrels. It was mostly new things. Isn’t this much more exciting than imitating others every day?
He didn't even ask anything and agreed first, so that these two people would not be able to find someone else.
Which unit is the most suitable for your own unit? If you don’t decide it first, it’s the same as unsafe.
He knew that there were several units that did the same job as his laboratory. He insisted on talking about his advantages. Perhaps the only advantage was that he was in Beijing. This was the biggest advantage, but the guidance of General Engineer Gao was the one who guided him. Yang Factory is also not in Beijing, but this does not prevent Guangyang Factory from winning the prize under his guidance, and a rotary encoder was played with by others.
I heard that everyone can now be self-reliant and develop more product categories based on the theoretical and practical experience they have gained.
This is called Master leading the way. Practicing is an individual, but it is very important to lead the way into the way. "Haha, it's all for work. Lao Cui, please introduce the specific matter to Director Li." Director Pan smiled.
Director Li opened the notebook, sat upright, and said serious things, and be serious. "General Manager Gao wants to develop a new power electronic device, which is an improvement of thyristors." Thyristors and thyristors are both things, depending on which name they say.
"SCR? It's great, this is our industry. What are the main improvements?" Director Li was stable when he heard this! It is not only good at, or at least familiar with it, but also has new features and improvements. This kind of work is simply too good to do. "According to Mr. Gao, there are not many improvements, only two, one is that it can be turned off and the other is that the working frequency is higher than that of ordinary thyristors." said Chief Engineer Cui.
Not many of this? Director Li's eyes almost fell out.
When thyristors are used at this stage, there are only two biggest problems.
First, the thyristor is a half-control device that can only be turned on, but cannot be turned off directly through the control signal. If the thyristor wants to turn off, it can only be converted or phase-changed through a complex and huge external circuit. Completed, this method is slow, complex, large and heavy, has high cost, low efficiency, high energy consumption and limited certain applications.
The second one is that the working frequency is low, which sometimes makes you unable to do anything in transmission and transmission.
"Not many of these? These two problems that Mr. Cui and Chief Engineer Gao have improved are basically the biggest problems of SCR at this stage, and the rest of the problems are easier to solve. This can be solved. Two questions are simply amazing." Director Li sighed in his heart. Chief Engineer Gao was still very good at making a big deal and too modest.
I have not solved many problems, only two. It was this humility that he felt a little psychologically uncomfortable, which was too humble.
Maybe in other people's opinion, there are really not many.
Even the director of the Electronics Institute was shocked when he heard the answer. At first, he only knew that Chief Engineer Gao had work to do, and it had a lot to do with Room 16, so he hurriedly brought 1218 with him. The comrades from the factory came over.
How could I think it was so big!
For comrades who are engaged in power electronic devices, being able to solve these two problems of SCR is simply opening up a new path.
"Director Pan, General Manager Cui, is this true?" He was a little unbelievable, even though Gao Zhendong's golden sign was here. "Anyway, Chief Executive Gao said that, I don't think there is a big problem." Chief Executive Cui thought happily about the optocoupler and MOSFET in his hand, thinking that this matter is absolutely reliable. "Don't worry, even if I draw all the strength in the 16th Room, I will definitely do the project of Chief Executive Gao." Director Li slapped his chest and imitated it, imitated it, even if he did it. If you stop the imitation work, you must do the job well.
"Well, the hospital supports you!" The dean was also not vague. It would be a pity to miss such a good opportunity.
Seeing their attitude, the two people from Factory 1218 smiled and expected: "Okay, since you have no objection, let's go to see Chief Engineer Gao."
No mistakes are made and one song is posted One content, one in one 6, one in one 9, one book, one bar, one read! "No objection! Absolutely no objection. Go now?" It's too fast, not ready yet. "Let's go now. I've made an appointment with Chief Executive Gao for the past two days. I can see you anytime after today. After today, it's hard to say."
The Dean and When Director Li heard this, he said that it was the reason. In terms of General Engineer Gao’s work arrangements, the ability to arrange 1218 in this way has shown that General Manager Gao attaches great importance to this matter and cannot delay it.
"Then let's go, Dean, I'll go first." Director Li didn't bother to stop, picked up his bag, grabbed a copy of the profile of his laboratory, and ran away with the 1218 comrade.
One hour later, he had already sat in the reception room of the third branch factory with his comrade of 1218.
"Three Rolling Factory Three Branch Factory, tsk~~~~" Looking at this place, he sighed with other comrades from this system for the first time. He went to this place to talk about such things, and it was the other party Dominant, I always feel a little unreal, this major is wrong.
When I saw the young Gao Zhendong, the unreality became even stronger. Although I had seen it many times, many comrades were not used to it.
"Come on, since we are here, let's start. We are doing GTO, and the door can turn off the thyristor."
The full name of this guy is really a bit long, so Gao Zhendong directly used the English name and abbreviation.
Gao Zhendong directly drew a structural diagram of GTO on the blackboard.
This is his choice. In the current environment, the easiest fully controlled high-power power electronic devices to achieve, and it has a wide range of applications, a long life cycle, and a relatively appropriate cost.
This guy can stand firm under the impact of IGBT and is widely used, which shows its capabilities.
From the limit, at the same frequency, its power is a little lower than SCR, but there is no big order of magnitude difference. We are likely to not use that high power now, but it can work in SCR In terms of frequency that cannot be achieved, this is even more important to us at the current stage than the ultimate power.
Looking at the gradually forming structural diagram on the blackboard, Director Li felt very familiar at first because this part was simple, and this part was drawn by Gao Zhendong first.
In terms of principle structure, he could see at a glance that the two layers on the initial part are the same as the typical four-layer three-terminal PNPN structure of SCR.
Oh, this thing is called a gate that can turn off the thyristor? That's all right, the structure is almost normal.
But when Gao Zhendong painted to the third and fourth floors, things changed.
The third and fourth layers of SCR's cathode are obviously divided into two layers, but the cathode of this GTO is divided into many, many, each surrounded by the gate. It is a Multi-cathode structure.
"Let's use the dual transistor model to analyze..." Gao Zhendong patted the chalk dust on his hand and taught them the lesson directly. This is the most core part, so you have to listen carefully.
"... From the above, it can be seen that when a sufficient positive pulse signal is applied to the gate, it is enough to make each cathode of the GTO enter a large-area conduction state. However, due to the structure, the conduction of the GTO is A critical conduction provides conditions for the shutdown of the negative pulse signal of the gate. Correspondingly, the device saturation of the SCR is deep and there is no shutdown condition. This is the biggest difference between the two." br>
Genius! Director Li only had this idea in his mind.
(This chapter ends)