Chapter 850: If you need people, you have people; if you need money, you have people (only 4k today, see the end of the chapter for the reason))
For Director Li, the shutdown issue is a difficult one to resolve. They have considered it and are eager to resolve it.

But the problem is that they have tried every possible way and feel that in order to achieve this effect, they either need new materials or new structures, or even a structure completely different from SCR, which is beyond the limits of current capabilities.

However, we didn't expect that Chief Engineer Gao would break the whole thing down into parts and solve the problem of excessive SCR saturation by making multiple changes.

Is this the combination of command technology and scientific technology? It's so terrifying... cough cough.

The fact that Gao Zhendong had served in the army and was a grassroots commander was no secret among several familiar ministries and added another layer of halo to him.

After hearing what Director Li said, Gao Zhendong laughed and said, "Haha, you didn't think about it in this regard. It's probably because of the limitations of processing technology that you don't dare to think about it in this regard."

This method can solve problems, and it can solve big problems, but there is a problem. Given the relatively crude processing technology of the current SCR technology, the comrades in the 16th Research Laboratory simply cannot come up with the technology to manufacture this structure.

The multi-cathode structure of GTO has thousands of cathodes instead of just ten or eight. Thousands of cathode units can be processed on a silicon wafer, which is far beyond the capabilities of the comrades in Room 16 and is beyond our imagination.

"Haha, Chief Engineer Gao, you are speaking well of us. To be honest, the main reason is that the theoretical foundation is not enough. We did not consider that this structure can reduce the saturation, and we did not consider that critical conduction can also work normally."

As for critical point, those who understand it will know that it means being on an edge. Under normal circumstances, one should stay as far away from it as possible.

However, with the advancement of technology, engineering and technical personnel will even actively pursue this critical state or even work in a supercritical state, but use other means to restrain it.

In the aerodynamic design of fighter jets, static instability is one of the typical characteristics of the third-generation aircraft. It relies on powerful flight control to allow the aircraft, which is in an unstable state in aerodynamic design, to fly normally.

Comrades were engaging in self-criticism and introspection, so Gao Zhendong naturally had nothing to say. He just pointed out the shortcomings of the device according to his usual practice.

"However, compared with SCR, GTO is not without its shortcomings," said Gao Zhendong.

All comrades have been prepared for this. There is no free lunch in the world.

"The first disadvantage is that the structure is much more complicated than that of SCR, and it is difficult to process. Fortunately, there is no problem now. With our current semiconductor processing technology, the most difficult multi-cathode processing in GTO processing is a very simple matter."

Everyone understood that, with the integrated circuit processing technology you have developed, processing requirements that are even more micro-carving than micro-engraving are naturally no problem.

Even the 10-micron process that has been made public far exceeds the practical requirements of GTO.

This is also one of the reasons why Gao Zhendong only started developing power electronic devices after the lithography machine and corresponding processes were perfected. Good products have high requirements!

The devices he was interested in all had superior performance but were complex to process. Without a photolithography machine, they were not easy to process. GTO only began to appear in the mid-to-late 60s, which was one of the most fundamental reasons. By that time, the earliest practical photolithography machine had just been launched. Without this machine, GTO processing was not that convenient.

Don’t think that Gao Zhendong always talked about 7nm, 5nm, and 2nm in his previous life. Putting aside the fact that these are just word games, in fact, in the world of semiconductors, 28nm and above is enough to do many things.

"Well, as for the rest, I won't mention some minor shortcomings. The second biggest and most obvious shortcoming is that its maximum power is an order of magnitude lower than that of SCR."

After hearing Gao Zhendong's words, everyone didn't take it seriously. Hey, what's the big deal? After all, power can be obtained by connecting in parallel, but the operating frequency is a problem that is innate. No matter how you connect in series or parallel, it can't be increased.

This is just like Gao Zhendong's previous life, when the CPU frequency reached a bottleneck, everyone started playing with multi-core. If the frequency can't be increased, then just add more functional units.

Blue Factory: Glue multi-core is also multi-core.

"This is not a big problem. The power problem can be solved by parallel connection, which basically does not cause any big trouble. And under very special requirements, some SCR can also be used, but from a broader perspective, the biggest problem of GTO compared to SCR may be that it is expensive."

GTO hasn't even started yet, but Director Li is already imagining the future.

The processing is complicated, so the cost is naturally higher.

After hearing what he said, everyone laughed.

Gao Zhendong smiled and said, "But don't worry. In fact, in the range from a few Hz to tens of kHz, except for the range below hundreds of Hz, the power of SCR is not as good as GTO at the same operating frequency. Moreover, at 10kHz, it is already in the restricted area of ​​​​SCR. It can't work above that frequency at all."

This actually means that although the SCR has a higher maximum power, its operating frequency is slightly higher and its power performance is not as good as that of GTO.

When the comrades in the 16th Research Room heard this, their eyes lit up and they quickly wrote it down.

In addition to the explicit knowledge, they also learned another implicit content - when working with SCR, don't even think about getting it above 10kHz. Don't bother. This thing can't reach that level at all. It's natural and there's no cure.

Although this was brought up unintentionally by Gao Zhendong, it was like a treasure to the comrades working on SCR. It clearly gave the extreme conditions, which helped them avoid detours and waste of resources.

After all, although GTO is good, SCR is cheaper and it is impossible to just throw it away. Moreover, SCR is cheap and has very clear advantages.

SCR and GTO are both thyristors, so they both have an advantage of thyristors, which is high voltage resistance!
The voltage resistance level of the two is exactly the same, which is the highest among all commonly used power electronic devices until Gao Zhendong's crossing. The current that can be withstood, which is actually the power, is also the highest.

What's even more incredible is that the withstand voltage of all devices will decrease as the current increases, but the turning point of the decline of these two brothers is the latest!

This is where the value of GTO lies. It has extremely outstanding advantages, a wide range of applications, a relatively simple structure, and a not-too-high cost.

For SCR, this can be said to be a one-trick pony that can do everything. My price is cheap, the power is high, and the voltage resistance is high. You can't help but accept it.

Gao Zhendong then broke down and explained the doping of each layer of GTO, related characteristics, parameter items, switching process, precautions, etc., to the comrades from the two units one by one. The comrades were very excited and thought this thing was great!

As for how Chief Engineer Gao knows so much before the product is even made, don't ask.

For the comrades in the 1761th room who already had experience in SCR, this thing was not a free gift, but it was not much different. The biggest process problem had been solved by Chief Engineer Gao and his comrades from the 1274 Institute and the Factory, including crystal pulling, doping, diffusion, lithography...

What they have to do is to combine what Gao Zhendong taught them with these excellent conditions and transform it into specific production processes.

If Mr. Gao has to do all this, they might as well just piss themselves and drown themselves. They can't afford to lose face.

Director Li looked at his many pages of research and discussed with Director Pan of 1218. "Director Pan, Chief Engineer Cui, regarding GTO, we will focus on the theory and you will focus on the production. What do you think? This way, we can combine the advantages of our two units and produce the best product as quickly as possible."

Director Pan nodded and said, "Well, that's good. We can afford to delay by leveraging our strengths and avoiding our weaknesses. But they can't afford to delay the thousands of substations, tens of thousands of motors, and countless industrial power supplies in China."

Gao Zhendong smiled and said, "Yes, our steel plant is in urgent need of high-power DC power supply. I'll leave it to you comrades."

Electric furnace steelmaking can be said to be the most urgent and important demand for high-power DC power supply at present.

When Gao Zhendong was working on ESR, he had to first get a low-voltage, high-power DC power supply, otherwise the electroslag remelting would not be possible at all.

It's just that the product used a mercury arc rectifier, and its size, weight, and cost were all difficult to describe. Most importantly, its performance was just adequate. There was no other way. We didn't even understand SCR that year, let alone high-power ones.

Gao Zhendong's words made the comrades feel that the burden on their shoulders was even heavier. Look, even Chief Engineer Gao was so anxious.

It was just that in a trance, they felt that there was something wrong with this matter. Anyone would feel that something was not right when they heard a person with such high attainments in semiconductors, electronics, and computers say "our steel plant".

Leaders of the 12th Ministry of Machine Building: Be content. If our ministry hadn’t tried every possible means, you wouldn’t have the chance to hear this.

Director Pan was still not satisfied: "Chief Engineer Gao, how about we organize the research on MOSFET in the same way?"

Since he didn't mention this, neither Chief Engineer Pan nor Director Li dared to bring it up.

MOS and FET were concepts that existed long before Gao Zhendong came here, so Gao Zhendong simply continued to use these abbreviations for convenience.

The advantage of Room 1218 in this regard is very obvious. Although they are engaged in SCR, they are definitely better than in semiconductor design. If our factory gets the MOSFET project, it will definitely be more powerful with the help of Room . The matter is important. It is impossible for our factory to consume so many new devices. Even if we can consume more, there is an upper limit. These new devices far exceed our factory's appetite. Director Pan knows how to integrate resources.

Even if he didn't say it, Gao Zhendong had already had this idea. Seeing that he took the initiative to bring it up, he readily agreed.

"Well, that's a good idea. Then you all come tomorrow and I'll explain MOSFET to you in detail."

GTO has a lot of content. They only come in the afternoon, and half a day is only enough to teach one GTO. No one is superhuman, and these things in GTO, even if you just read them aloud, will take an hour or two, not to mention explaining and answering questions.

Director Li was overjoyed. There is actually more?

After leaving Gao Zhendong's place, although it was already time to get off work in the afternoon, Director Li did not even go back to his home, but rode his bike straight to the office.

As he expected, the dean was waiting for his result at the unit.

"Old Li, how is the situation?"

Director Li pushed his notebook in front of the dean and said, "Very good, a big job! I have to go again tomorrow, and there is another thing. Comrades 1218 are going to drag us along to do it together."

The dean took a quick look through it and clapped his hands in amazement: "Good stuff, really good stuff! Comrades from other research laboratories will benefit from it." As a comprehensive institute in this field, the Institute of Electronics has departments engaged in power generation, transmission, transformation, motor traction, etc. The dean could tell at a glance how much Director Li had gained today.

Motor traction is also one of the professional courses in the major of electronic engineering, and it is particularly important in this era.

He raised his head and said, "We will treat this matter as a top priority in our hospital. If you want people, I will give them to you! If you want money, I will give it to you! If you want resources, I will give it to you!"

So there are only people, right? Director Li didn't know whether to laugh or cry, but it didn't matter: "As long as there are people, the department will cover all the funding, and we won't have to worry about the time and quantity."

This is another advantage of working with Gao Zhendong. The funding is well guaranteed, sufficient and stable.

Regarding this matter, the comrades of the 12th Ministry of Machine Building had no complaints or dissatisfaction about the preferential treatment given to Gao Zhendong, an "outsider".

If you had his ability, you could do the same.

Twelve Machine Department: Do you think his funding is only from me? Naive! -
In a certain place in Beijing, some statistical data of various industries for half a year have been released. As an important statistical node, the half-year data of various industries are very important.

The chief was very happy holding a statistical document.

"Well, this year's data was collected very quickly, more than a month earlier than last year."

The sooner you get the data, the earlier you can make analysis and adjustments, which will be more beneficial for your work.

"Yes, sir. With new technologies such as computers, remote data communications, and databases, our statistical work this year has indeed become much more convenient and faster. And we expect this to become a normal practice, not a flash in the pan. Our health department is fine, and the comrades in the economic department, especially those in charge of statistics, are full of praise for this."

The statistics of the Ministry of Health and Family Planning are statistics, and the statistics of the Economic Department are also statistics. The two still have business dealings and exchanges. I know a general idea of ​​the situation, and the leaders who come to report have also heard about it.

"Very good, very good. Our comrades on the science and technology front have made great contributions."

After saying that, he lowered his head and looked at the materials in his hand. This one was from the Medical Department.

As he watched, he frowned.

"Is there any statistical problem with your data? Is it realistic?" he asked.

"Commander, these figures have been strictly investigated and verified by us. The data starts from the grassroots level and can be traced back to the source." The comrade who reported was very confident that these data can stand the test.

"Well, I see. Then take a look at this data and see if there is anything wrong with it?"

The chief pointed his finger at a column of data, "New number of medical workers."

(End of this chapter)