Otaku Engineer in Great Tang Dynasty

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"There is another way to convert alternating current into direct current!"

In the workshop, in Mo Lingwei's laboratory, Li Zexuan put down the pen and paper in his hand and said.

When Mo Lingwei and Wang Ji heard it, they couldn't help but be surprised. Mo Lingwei said, "Sir, how can this alternating current be converted into direct current?"

Li Zexuan smiled and said: "Whether it is alternating current or direct current, they are all electricity, and of course they can be converted to each other! With a rectifier circuit, you can convert alternating current into direct current, and with an inverter circuit, you can convert direct current into alternating current! However! , A new electronic component is needed in the rectifier circuit - a rectifier diode, which has unidirectional conductivity and can only pass current in one direction, with it, we can build a rectifier circuit!"

When Mo Lingwei heard the words, she immediately became interested. She hurriedly asked, "Sir, what should I do with this rectifier diode? Can you teach me?"

In the eyes of others, the knowledgeable first female professor of Yanhuang Academy, but at this moment, like an ignorant student, she is frantically acquiring knowledge from Li Zexuan.

Li Zexuan pondered for a moment and said: "This rectifier diode can be divided into electronic diodes and crystal diodes according to the different materials. According to our current conditions, we can try to make some electronic diodes! Miss Mo, Mr. Wang, I will make this today. I will teach you how to make electronic diodes, and you have to promise me not to leak it, otherwise not only will the workshop suffer losses, but Datang will also suffer losses!"

In the end, Li Zexuan solemnly instructed Mo Lingwei and Wang Ji.

Electronic diodes, also called vacuum diodes, are widely used in voltage regulator and rectifier circuits because of their unidirectional conductivity. Throughout the history of the development of human integrated circuits, the invention of the electronic diode can be regarded as the starting point of the human electronics industry, so Li Zexuan cannot be taken seriously.

In the previous life, after the invention of the electronic diode, the American inventor DeForest ingeniously added a grid plate between the diode filament and the plate, and achieved the world's first electronic triode. Since then, the electronic components sealed in the "small glass bottle" have been widely used in various electronic products. Electronic products such as TVs, radios, amplifiers, etc. are all inseparable from diodes and transistors!

However, the defects of electronic diodes and electronic triodes are also obvious - large power consumption, large heat generation, large size and short lifespan, so people have been looking for new electronic devices to replace them. It was not until the birth of the transistor and the arrival of the era of solid-state electronics that the tube was completely replaced!

In the 21st century, diodes and triodes used in various countries in the world are actually transistors. Of course, there is also a name called semiconductor tubes, because they are all made of semiconductor materials silicon or germanium. Based on Datang's current industrial base, firstly, purifying silicon or germanium is a problem, and secondly, the key structure in semiconductor diodes, the fabrication of pn junction, is also a considerable problem.

The so-called pn junction is to use different doping processes to make p-type semiconductor and n-type semiconductor on the same semiconductor substrate through diffusion, and form a space charge region at their junction called pn junction. Unidirectional conductivity. The n-type semiconductor is a silicon crystal (or germanium crystal) doped with a small amount of impurity phosphorus element, and the p-type semiconductor is a silicon crystal (or germanium crystal) doped with a small amount of impurity boron element.

Li Zexuan has no boron on hand, so he temporarily gave up the plan to make crystal diodes!

"Don't worry, Chief, what the Chief said here today, Wang will never say a word to outsiders, even if he is drunk!"

Wang Ji bowed his hands first, but the second half of the sentence made people laugh or cry.

In other words, although this old guy is an alcoholic, he doesn't talk nonsense when he is drunk, which is quite reassuring.

"Captain, I won't leak what you said, I... I guarantee it with my life!"

Hearing that Li Zexuan and Wang Ji were both serious, Mo Lingwei also became serious and said to Li Zexuan.

Li Zexuan nodded and said, "That's good! Next, I'll tell you what to do with this electronic diode!"

After speaking, Li Zexuan picked up the pen and paper again, and while drawing a sketch, he explained: "First of all, we enclose two metal sheets in the vacuum glass tube. Once the oxygen is exhausted, there is no need for a complete vacuum. Then, after we apply alternating current to the anode plate, a constant current in the same direction will appear on the other plate!”

Mo Lingwei was a little puzzled: "Shan Chang, what's the principle?"

Li Zexuan thought for a while and explained: "Look, when the anode potential is higher than the cathode, the electrons emitted by the cathode move towards the anode under the action of the electric field to form an electron flow. When the cathode voltage is higher than the anode, the electric field that the electrons are subjected to The force is to pull the electrons back to the cathode, and no current can be generated, so this electronic diode has unidirectional conductivity and can be used for circuit rectification!"

In fact, this effect was called the "Edison Effect" in previous lives.

In 1883, in order to find the best filament material for light bulbs, Edison placed a copper wire near the carbon filament inside the vacuum bulb, hoping to prevent the carbon filament from evaporating. Although it failed, he accidentally discovered that the copper wire that was not connected to the circuit generated a weak current because it received the hot electrons emitted by the carbon wire. Although Edison did not study this phenomenon carefully, he applied for a patent for the "Edison effect".

In 1896, Fleming was working on improving wireless telegraph receivers

When the detector is used, it is envisaged that the Edison effect is used for detection. He encapsulated two metal sheets in a vacuum glass tube, and after applying a high-frequency alternating voltage to the anode plate, the Edison effect occurred, and the alternating current was turned into direct current when the alternating current passed through the device. Fleming called this tube equipped with two electrodes a vacuum diode. It has two functions of rectification and detection. This is the first electronic device in human history.

What Li Zexuan wants to do now is this vacuum diode! Although he knew the principle, he really wasn't sure whether he could do it in the end.

"Master, I can understand! In general, the structure of this electronic diode is not complicated. Although it takes a lot of work to do it, it is not completely impossible to do. Please let me try it a few times!"

After listening to Li Zexuan's explanation, Mo Lingwei thought for a long time by herself, and finally nodded.

Wang Ji also cupped his hands and said, "Wang probably understands it too! I will definitely assist Miss Mo in making electronic diodes!"

The progress of Mo Lingwei's side is directly related to whether his electrolysis workshop can continue normally. Of course, he is more concerned than anyone else!

Li Zexuan nodded and said, "So it's hard work for the two of you! But in my opinion, the DC generator and the electronic diode can be manufactured at the same time! Whichever is built first, it will be put into use first, and the electrolysis workshop can start earlier!"

To be on the safe side, Li Zexuan decided to be hard with both hands and grasp with both hands! (I think he's driving, but I don't have proof)

"Yes! Mountain Chief!"

The two shook hands.

Li Zexuan nodded with satisfaction, and secretly said in his heart: With diodes, the triode will not be far away. By then, many electrical appliances can be built, and Datang will soon enter the electronic age!

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