Chapter 1458: Electronic dipole!

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

In the workshop, Mo Lingwei's laboratory, Li Zexuan put down the pen and paper

in his hand and spoke.

When Mo Lingwei and Wang Ji heard this, they couldn't help being surprised. Mo

Lingwei said, "Shanchang, how can this alternating current be transformed into

direct current?"

Li Zexuan smiled and said: "Whether it is AC or DC, they are all electricity,

and of course they can be converted into each other! With a rectifier circuit,

you can convert AC to DC, and with an inverter circuit, you can convert DC to

AC! But The rectifier circuit needs a new electronic component rectifier

diode. This diode has unidirectional conductivity and can only pass current in

one direction. With it, we can build a rectifier circuit!"

Mo Lingwei immediately became interested when she heard the words, and she

quickly asked, "Zhang Chang, 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, at this moment, like an ignorant student, is absorbing knowledge

frantically 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 different

materials. According to our current conditions, we can try to make some

electronic diodes! Miss Mo, Mr. Wang, I will use this today. To teach you how

to make electronic diodes, you have to promise me never to leak, otherwise not

only the workshop will suffer losses, but Datang will also suffer losses!"

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

Electronic diodes, also called vacuum diodes, are widely used in voltage

stabilizing and rectifying circuits because of their unidirectional

conductivity. Throughout the entire history of human integrated circuit

development, the invention of electronic diodes can be regarded as the

starting point of the human electronics industry, so Li Zexuan can't help

being serious.

In the previous life, after the invention of the electronic diode, the

American inventor De Forest cleverly added a grid plate between the diode

filament and the plate, making the world's first electronic triode. Since

then, the electronic components sealed in "small glass bottles" have been

widely used in various electronic product fields. Electronic products such as

televisions, radios, amplifiers, etc., are all inseparable from diodes and

transistors!

However, the shortcomings of electronic diodes and electronic triodes are also

obvious: high power consumption, large heat generation, large volume, and

short life span, so people are always looking for new electronic devices to

replace them. It was not until the birth of transistors and the arrival of the

era of solid electronic technology that electron tubes were completely

replaced!

In the 21st century, the diodes and triodes used in countries all over the

world are actually transistors. Of course, there is also another name called

semiconductor tube, because they are all made of semiconductor material

silicon or germanium. With Datang's current industrial foundation, firstly,

purification of silicon or germanium is a problem, and secondly, the

production of the key structure pn junction in semiconductor diodes is also a

considerable problem.

The so-called pn junction is the use of different doping processes, through

diffusion, p-type semiconductor and n-type semiconductor are fabricated on the

same semiconductor substrate, and a space charge area is formed at their

junction, which is called pn junction. The pn junction has Unidirectional

conductivity. Among them, n-type semiconductor is silicon crystal (or

germanium crystal) doped with a small amount of impurity phosphorus element,

and p-type semiconductor is silicon crystal (or germanium crystal) doped with

a small amount of impurity boron element.

Li Zexuan currently does not have boron on hand, so he temporarily gave up

this plan of manufacturing crystal diodes!

"The mountain leader can rest assured, Wang will never say a word to outsiders

what the mountain leader said here today, even if he is drunk!"

Wang Ji was the first to bow his hand, but the second half of the sentence was

a bit dumbfounding.

Even though this old guy is a drunkard, he doesn't speak nonsense when he is

drunk, which is reassuring.

"Shanchang, I won't leak what you said, I... I promise with my life!"

Hearing what Li Zexuan and Wang Ji said was very solemn, Mo Lingwei also

became serious and said to Li Zexuan.

Li Zexuan nodded and said, "That's good! Next I will tell you how to make this

electronic diode!"

As he said, Li Zexuan picked up paper and pen, and while drawing a sketch, he

explained: "First of all, we seal two metal sheets in the vacuum glass tube.

Of course, we can also use the method we used to make electric lights to put

the glass in the glass tube. If the oxygen is exhausted, a complete vacuum is

not required. After that, after we add alternating current to the anode plate,

a constant current with the same direction will appear on the other plate!"

Mo Lingwei was a little puzzled: "Shan Chang, what is 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 toward

the anode to form an electron flow under the action of the electric field.

When the cathode voltage is higher than the anode, the electric field the

electrons experience The force pulls the electrons back to the cathode and

cannot generate current, so this electronic diode has unidirectional

conductivity and can be used for circuit rectification!"

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

In 1883, in order to find the best filament material for electric bulbs,

Edison placed a section of copper wire near the carbon filament inside the

vacuum bulb, hoping to prevent the carbon filament from evaporating. Although

he failed, he accidentally discovered that the copper wire that was not

connected to the circuit generated a weak current due to 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~www.mtlnovel.com~

years. When Fleming was researching and improving the detector in the

radiotelegraph receiver, he envisaged the use of the Edison effect. Detection.

He encapsulated two metal sheets in a vacuum glass tube and applied a high-

frequency alternating voltage to the anode plate. After the Edison effect

appeared, the alternating current was converted into direct current when the

alternating current passed through the device. Fleming put this equipment A

tube with two electrodes is called a vacuum diode. It has two functions:

rectification and detection. This is the first electronic device in human

history.

What Li Zexuan has to do now is this kind of vacuum diode! Although he knew

the principle, he was really not sure whether it could be done in the end.

"Shanchang, I understand! Generally speaking, the structure of this electronic

diode is not complicated. Although it takes a lot of work, it is not

impossible to make it. Let me try it a few times!"

After listening to Li Zexuan's explanation, Mo Lingwei thought alone for a

long time, and finally nodded.

Wang Ji also said, "Wang probably understands it too! I will definitely assist

Miss Mo to make the electronic diode!"

Mo Lingwei's progress is directly related to whether his electrolysis workshop

can proceed normally, of course he is more concerned than anyone else!

Li Zexuan nodded and said, "That's a lot of hard work! But in my opinion, DC

generators and electronic diodes can be manufactured at the same time!

Whichever is made first, put into use first, and the electrolysis workshop can

start earlier!"

To be on the safe side, Li Zexuan decided to have both hands hard and grab

both hands!

"Yes! The mountain is long!"

The two clashed in response.

Li Zexuan nodded in satisfaction, and said in his heart: With diodes, the

triode is not far away. By then, many electrical appliances can be made, and

Datang will soon enter the electronic age!

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