[Brothers, there are a lot of things going on this Spring Festival, and it is difficult to calm down the heart, so let's keep two shifts a day first, and ask for a monthly pass. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ】

……

"No, we're going to go together. "Nomin is also very stubborn.

Nuoda understood the girl's temperament, sighed, and said: "Mom and Dad have been staying at Muto's house, I see that they mean that they want to ask Mutuo to come and tutor us for a few days, and I don't know how much it will cost." ”

Nuo Min was anxious when he heard this, "I don't want Mutuo to tutor me, it took three years to get admitted to one or two books!"

Nuoda's expression darkened, "It's already very powerful for people to be admitted to the second book, heh, my brain, it's useless for anyone to tutor, look at Muto's meaning and take the shelf, my mother has been helping, I said no, and was reprimanded, let me come back and prepare food with you to send it to those people." ”

Hearing those people, Nuomin's eyes lit up, and he said happily: "I heard that those are the most knowledgeable and learned people, I once sent cheese over, and saw that the whiteboard was full of a lot of very complicated things, which looked very magical, and those soldiers respected them very much, and they looked very powerful." ”

As he spoke, his eyes were full of little stars, and he looked like a nymphomaniac.

"Those people must be very powerful, even Chief Huang is polite, and I don't know what level they are. ”

"What level? Brother, they are all great professors and academicians, and they are all the most famous universities in the country. ”

"What's the Professor, is he awesome?" Noda scratched her head.

"Of course it's amazing, the professor is the teacher who teaches those college students, think about it, how knowledgeable it is, if you can guide us, then the improvement must be very fast. Nuo Min clasped his hands together with great longing, Mu Tuo was more than 108,000 miles behind these people.

Nuoda smiled: "Hehe, sister, you really dare to think about it, my parents don't know if people are willing to invite Mutuo over now, you still want the teacher of the college student to tutor you, how many times have we sent food in the past, those people don't look at us at all." ”

Hey, too, Nomin always has some unrealistic fantasies.

"Alright, my sister, let's hurry up and prepare the food, and next time we make our cheese tastier, maybe some of the professors will agree." ”

Nomin nodded.

"Oh, by the way, who's that kid riding a horse in our house?"

"That's the guy Uncle Wu brought here, saying that he was his brother, and he came to the house to learn how to ride a horse. ”

"Uncle Wu's brother, that must be very powerful. "Nuoda still prefers Boke and admires Wu Ze quite a lot.

Nuo Min shook his head and said with a smile: "It's not great at all, but it's a very timid guy, he can't ride a horse well, and he only dares to pull the horse around in a circle." ”

"Hahaha, that's very timid, how could Uncle Wu know such a strange guy. ”

The two brothers and sisters prepared to provide fresh food, Liu Chen just rode around and came back, seeing that they were busy and came to help, prepared a lot of food, put it on the back of several horses, he volunteered to help them deliver it together.

Nuo Min glanced at it and said, "You don't know how to ride a horse, so you don't need to help." ”

Nuoda's Chinese was not very good, and she said, "Brother, no need." ”

Liu Chen turned over directly on the horse and said with a smile: "There is an old saying that Shibei should be impressed for three days, Miss Nuomin, you can't look at people with old eyes, although I am not skilled now, it is always no problem to ride and run, holding so many goods, you will not ride too fast, let me help, I eat and drink for nothing, I am not comfortable." ”

Steering the horse in a circle, it did look like it.

When a horse is turning or circling, it must not pull on the inside reins, but must have a correct inside position. The outside reins are in contact with the horse's mouth, the outside foot is back, the inside foot is pressed outward, and the inside reins are pulled so that the horse will turn.

This is the best practice that Liu Chen has tried several times and summed up, and it is not much different from the standard action.

That's the power of thinking, it's all about it.

In Nuo Min's opinion, Liu Chen's movements were still too stiff and contrived, and the waves were too exaggerated, but he was able to control the horse, "Then you can come along." ”

Noda smiled innocently.

The east side of the Wuli Spring of Aershan Mountain.

This is a beautiful pasture, dense mountain forests, low hills, several army green houses show half of their heads out, even if they are close to a hundred meters, you can't see that this is a house, there are a few soldiers guarding the entrance place, Nuo Min and Nuoda two brothers and sisters often come, they go in directly without any interrogation, the horses are parked outside, and the three people carry them inside.

Nuo Min went to the kitchen to deliver fresh goat's milk, while Liu Chen and Nuoda moved the cheese and milk cakes to a large conference room, which was a very large room, with a huge table full of messy papers, and a whiteboard in front of it, on which a topology was drawn.

After the two of them finished transporting, Nuoda looked around curiously, and said enviously: "Brother, these people are all great professors, and the teachers who specialize in teaching college students are the most knowledgeable people. ”

Liu Chen looked at the topology on the whiteboard in a daze, he was too familiar with this, based on the series resonant soft switch of the high-voltage DC generator, in the previous life he has been developing a high-precision bidirectional power free flow system is based on this basic topology, but a lot of improvements, experiments and writing a large number of control algorithms and analog hardware control circuits.

The biggest feature of this topology is that it can greatly increase the frequency of switching devices, and truly achieve high frequency, the idea of control strategy is very strange, and the hardware circuit must be realized with FPGA and analog circuits, and the speed of the controller cannot keep up.

"Do you know what they're developing?" asked Liu Chen with a smile.

Judging from this topology, there is no doubt that the HVDC generator is too familiar to him.

Nuoda scratched his head and said with a smile: "How do I know this, one by one, I can't understand the ghost drawing talismans at all, hehe." ”

The two walked outside, when Liu Chen passed by the whiteboard, it was obvious that the topology was not comprehensive, and the most important waveform diagram was missing, and for a while, he quickly drew the energy conversion diagram of the series resonant circuit with a watercolor pen, one of which is the current diagram of the resonant inductance and the matching resonant capacitor voltage diagram, since it is a resonant circuit, then the current and voltage diagram should be sine or cosine shape, and the inverter charges or discharges the resonant circuit according to the current diagram, so as to control the energy size and achieve the purpose of raising ultra-high voltage DC。

If you want to increase the frequency of the frequency, the key point is the zero crossing point of the resonant current.

After Liu Chen finished drawing the figure, he didn't forget to draw a circle mark at the zero point of the current. (To be continued.) )