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The east side of the Wuli Spring of Aershan Mountain.

This is a beautiful meadow, a natural golf course, dense mountain forests, low hills, a few army-green houses show half of their heads, even if they are close to a hundred meters, they can't see that this is a house, and they don't think that there are more than a dozen floors of space below, the top floor is a large conference room, a large table made of solid wood looks very rough, more than 20 people are standing in it, one by one, all over forty or fifty years old.

One of the gray-haired old professors drew a topology on the whiteboard, and the watercolor pen hit it vigorously, and shouted: "The weight of the entire high-voltage power generator cannot be reduced because the frequency is not high enough, as we all know, high frequency can make the electrical device miniaturized and lightweight, and the switching frequency of the inverter must be further improved." ”

Before he finished speaking, another slightly chubby old man with a cigarette said fiercely: "Professor Gong, if the frequency is further increased, the switching loss will also increase, the power efficiency will be seriously reduced, and the electromagnetic interference will also increase. ”

Professor Gong Shu, who was demonstrating on the whiteboard, glared at the professor who was speaking just now, and shouted: "Qin Ming, you don't want me to say anything, you just say that this is not good, that is not good, then you can propose a feasible plan?"

Qin Ming was a little angry, all of them were the authorities of power electronics in major universities in China, and they were very polite to each other, how could they call them by their names, and they were not happy at the moment, and said angrily: "I will propose a plan, but first of all, your plan will not work." ”

Huang Jie, who was in charge of receiving these scholars, frowned, feeling miserable, this group of big professors and even academicians gathered together to solve the problem of public relations technology. It's usually a lot of effort to reconcile.

The group of people who have been staying in school to do academics have a stunned temperament, no one is convinced, and the quarrels are quite fierce when discussing technical issues.

Especially Gong Shu and Qin Ming. These two people love to fight the most, Gong Shu is an authority on electricity at Jianghai University, and Qin Ming is a well-known professor at Qingbei University. As a result, Gong Shu helped the country solve the problem by virtue of his research on the ice melting of high-voltage lines, and was rated as an academician of the Academy of Engineering one year first, and Qin Ming was rated the next year.

"The two academicians are both for the national project, and they are both contributing to the country, so don't hurt the harmony. ”

Both of them snorted, obviously Huang Jie's reconciliation was completely useless, and Huang Jie sighed softly helplessly. Don't look at his level, it's not low, but in front of these scholars, it's not even a fart.

Gong Shu didn't give an inch and said, "Then you can tell me about your plan?" As he spoke, he walked down and gave up the position of the whiteboard to Qin Ming.

Qin Ming walked up and said: "In the high-power high-voltage DC generator, conventional PWM is used, and the switch tube works in a hard switching state, and the switching loss is large, which will inevitably lead to an increase in the probability of damage, and our equipment is used in space. Stability must be the first place, once damaged the loss is great, so this switching frequency can not exceed 1000Hz. ”

Gong Shu immediately said: "It's not nonsense, the switching frequency can't go up." Now the weight of the whole equipment is far more than the requirements, and since you know that it is used in space, how much does it cost to send this equipment up and make it a little heavier?"

"If you lose reliability in order to reduce a little weight, you send it up, and the damage can't be repaired, isn't it in vain?"

It's going to be quarrelsome again. Huang Jie rubbed his bulging temples and said helplessly: "Two academicians, because of the particularity of the use of this set of equipment, it is necessary to combine weight and reliability, and these two indicators must be met, after all, there are many other equipment, and there is really no way to reduce the requirements." ”

The other professors were also very dissatisfied, and they quarreled, and they were very relaxed and happy when they first came to this place, but after staying for half a month, arguing and discussing all day long, they were already tired of it, and they couldn't wait to leave this ghost place where birds don't immediately, and go back to that place are all well-known professors.

"How can this be done, the weight requirements are so strict, and the frequency is not increased, it is impossible. ”

"And the power source is still solar energy, the input stage is also unstable, and adding an extra voltage stabilization unit is also weight. ”

"There is no suitable solution for the discussion and discussion. ”

Huang Jie said: "Professors, between frequency and reliability can find a solution, at present, Simenzi and Fenlip are able to provide safe and reliable products to meet the weight, but their asking price is too high, and they are unwilling to provide technical information, but also ask to participate in the launch, how can this key technology be controlled by others, and I hope you will cooperate wholeheartedly to solve this problem." ”

The professors' faces are all red, foreigners have already figured it out, so many people can't solve this technical problem, it's a shame.

Qin Ming drew several topologies on the whiteboard and said: "Soft switching technology must be used to solve the problem of switching loss and switching noise in the circuit, and the switching frequency is increased to 5000Hz, then the weight may reach the standard, and the reliability can also be guaranteed." ”

Gong Shu snorted and said: "Adding capacitors, inductors and other soft switches on each switch tube will increase the weight itself, only to 5000Hz, the weight reduction of the transformer is not enough to make up for the weight increase of these devices." ”

Again, this is a real problem.

The professors here are helpless, the technical parameters of this high-voltage DC generator are too high, no matter which scheme is adopted, it cannot meet all the requirements, and so far no feasible topology has been proposed.

Zhang Zheng, a professor at Nanchen University, said tentatively: "Wouldn't it be possible if we used another soft-switching technology?"

Qin Ming was very powerful as an academician, and frowned: "Xiao Zhang, what is the soft switch you are referring to?"

The famous Professor Zhang became Xiao Zhang in the mouth of Academician Qin, Nanchen University doesn't know how many students are scared to death when they see Zhang Zheng, the famous iron-blooded and cold face, if the graduate graduation defense is encountered, it is basically a life of nine deaths, prepare for a special change, there is no room for a little sand in your eyes.

Everyone looked at him, he didn't come a little nervously, in Nanchen University, his territory, of course, is light and light, but all the big guys here are not inferior to him, and there are several older than him, so they naturally become hairy boys.

"Academician Qin, our previous direction was to add soft switches to switch devices, can we design soft switches in the main circuit?"

Qin Ming frowned and said, "Xiao Zhang, since you have an idea, you might as well show it to everyone, even if you are immature, it can play a role in throwing bricks and attracting jade." (To be continued.) )