Zhang Zheng did have some ideas, but he hadn't considered it clearly. Everyone looked at him, got up and walked forward to draw a standard inverter structure, and then added capacitors and reactors to the main circuit, saying: "Is this structure feasible? Use a modulation method combining pam and pm. △〓Yi read the book〓△."

Qin Ming said after thinking: "Pam control uses the thyristor phase-controlled rectifier circuit to adjust the DC bus voltage to adjust the output power, and the pm control adjusts the output power by changing the operating frequency of the inverter circuit. Pam controls the thyristor phase, which will generate switching losses. Moreover, the switching frequency of the thyristor is low, which determines that Pam cannot respond quickly; pm can only eliminate the single loss when the switching tube is turned on or when it is turned off. When the switching frequency is high, the switching loss is still high, which still has a great limitation on the switching frequency."

A unique vision, a burst of blood was seen.

Gong Shu also said: "This method is a big deal. The main circuit increases the capacitance reactance. How much weight is there? Regulation needs to be controlled, not more complicated? This mode does not need to be discussed and makes no sense."

Other professors also made suggestions, and criticism was very direct and sharp.

Zhang Zheng was like those students who had been severely criticized by him, and he did not dare to say much. "Yes, what the two academicians said makes sense, but I think the traditional ideas are not working. If you want to make a breakthrough, you can only go in this direction. The consideration is not mature, so please forgive me."

As he spoke, he started coughing violently. Yi read the book.―11

Huang Jie looked at him with pity, poured a glass of water and said, "Professor Zhang, are you okay? Take a sip of water and take a rest."

Zhang Zheng took it over and nodded, "Thank you, your throat has not been good these two days. Maybe it's allergic to pollen. Look at my body being pretentious. This place is like a paradise, and I'm not used to it yet."

"Professor Zhang is too busy for the project. That little Lu, you take Professor Zhang to the hospital for a look. Scientific research is important, and physical health is even more important."

"No need. Just drink more water."

"This won't work. If it causes pneumonia seriously, it will be troublesome. Let's go and see. The body is the capital of the revolution. Xiao Lu. Hurry up and take Professor Zhang there."

Zhang Zheng took the opportunity to follow the soldier Xiao Lu out, avoiding other difficulties.

The professors are still discussing the failures of his topological structure, and no one can think of a better idea, but everyone here is a big shot, and it is absolutely sharp to find faults.

This also gave Huang Jie a headache. There is no way. These are all the treasures of the country. Each temper is bigger than the other. How can this project be done? Do you really have to purchase equipment from two foreign companies? Read the book. One reads the book. One reads the book. That is too restricted by others.

The tonsils on one side of Zhang Zheng were a little big. I was used to the climate of Nanchen. I really couldn't stand it when I went to a dry place like the North. I happened to go to the hospital for a look. I prescribe some throat solubilizers and other ingredients to improve it.

The hospital in A Ercheng is very small, with eight houses besieged in the small courtyard, and there are only a few formal doctors. With a few nurses, Xiao Lu took him to find the doctor and took a look and prescribed some medicine. Just as he was about to leave, he heard a dull and painful sound from the yard in the middle.

"What's going on next to you?" he asked curiously.

The young doctor hurriedly stood up and rushed over, saying, "Hey, this mother is dysfunctional. She is also allergic to anesthetics. The hospital machine is still broken. No one can repair it. It is impossible to protect the big one, and the small one cannot protect the big one. The mother's lover is Captain Wu, who is responsible for public security. She can't stand it anymore."

Zhang Zheng hurriedly said, "Let's go and take a look, maybe we can help."

Wu Ze was pounding a big rock in the middle of the yard in pain, and his fist was covered with blood. This was too difficult for a man. A young nurse stood next to him and urged: "Captain Wu, please make a decision quickly, otherwise the adults and children will not be protected."

When he thought of his wife's haggard face and sad face, he felt like a knife cut. But just now, his wife held his hand tightly and chose to save the child. How could he make this decision? It was a wife who supported each other. How could he watch her die? He just gave up the child, and how could he face it in the future?

"Doctor, is there really no other way?"

The nurse said a little impatiently: "Captain Wu, there is really no way. Your lover has a special physique and the machine in our hospital is broken again. Unless the machine can be repaired immediately, there may be a chance, but... but we can't find anyone who can repair it here."

Zhang Zheng couldn't bear it. His wife had a difficult labor and heavy bleeding back then. Fortunately, the authoritative old director of the Nanchen University Affiliated Hospital was rescued. He empathized with the painful choice of losing his relatives. He couldn't help but rush forward and said, "Miss, maybe I can repair that machine, can I give it a try?"

Wu Ze was like a straw that was about to drown and grabbed Zhang Zheng's arm with great force. The force was so strong that Zhang Zheng felt pain. He said tremblingly: "Can you repair it?"

"My research direction is in high voltage power. The core component of this machine is also a voltage power generator. But I have never repaired it and I am not sure. Let's give it a try."

The soldier, Xiao Lu, was also a little moved and said arrogantly: "This is Professor Zhang, an expert from Nanchen, Captain Wu, you are lucky."

Wu Ze ignited hope again and hurriedly pulled Zhang Zheng in. After a while, everyone helped to dismantle the machine. Seeing the dense lines inside, he didn't know what to do. He looked at Zhang Zheng nervously.

Professor Zhang, the authoritative electrical engineering, was stunned when he saw the complex circuit structure inside. He had a strong theoretical height, but he had too little practice and didn't know what to do for a moment. Everyone looked at him, so he had to bite the bullet and stared at the circuit board with his brows, and smelled the burnt smell with his nose.

It is really difficult for a university professor to play as an electric repairman, and his hands-on ability is too poor. Usually, these low-level jobs are thrown to undergraduates. He has a large laboratory at Nanchen University, and there are three associate professors alone. One of them has worked as a postdoctoral fellow abroad for five years. There are more than ten doctoral students, and there are more masters. There are a lot of undergraduates. As the subject leader, you can control the next direction and review the paper.

It's too late to regret now.

Ten minutes passed, and Zhang Zheng was completely unable to find out his clues. After touching this point and looking at that point, he finally knew what it was difficult to get rid of a tiger.

Wu Ze was so anxious that the nurse came over to inform his wife that she woke up again, and he hurried over.

Professor Zhang really wanted to escape, but he had never been so embarrassed. His life was in his hands, but he couldn't do it well. The beads of sweat as big as beans on his forehead rolled down, and he was panting heavily, which was even more nervous than his wife's arduous childbirth.

At this time, a few people hurried in. After watching for a while, the young man's voice rang out and he said lightly: "Let me try it."
Chapter completed!