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Азбука РадиоСхем

00:00:00

Hello, today I came across a

00:00:01

non-standard power supply, you might say, this is a power

00:00:04

supply from a tumashinka. This is the

00:00:07

same switching power supply, and using its

00:00:10

example, I want to show how it works,

00:00:13

what’s inside, and in general, how to

00:00:16

repair switching power supplies,

00:00:18

it doesn’t matter what they are, because they are

00:00:22

about they are all designed the same way, let's

00:00:24

look at its block diagram, using this

00:00:28

approximately block diagram, almost the

00:00:30

majority of switching power supplies are assembled and

00:00:33

Let's look into it so that you can

00:00:35

understand that it doesn't matter what type of

00:00:38

power supply you repair; the main thing is

00:00:41

to divide them into two types: these are linear

00:00:44

power supplies, which cost an ordinary one an

00:00:47

ordinary transformer, a diode bridge,

00:00:49

a rectifier and a smoothing capacitor, and

00:00:52

then a stabilization circuit in a switching

00:00:55

power supply, everything is a little different

00:00:57

here at the input, most often there is a network

00:01:00

filter, here it is, but it may not be

00:01:03

present;

00:01:11

The rectifier is most often 4 diodes and behind

00:01:15

it there is also an

00:01:17

electrolytic capacitor that rectifies the

00:01:20

alternating current. And then the most interesting thing begins. The most

00:01:23

interesting thing is the inverter, as a rule, it is

00:01:27

made on a bus controller microcircuit,

00:01:29

it can be transistors. And what it does is the

00:01:33

microcircuit generates a

00:01:36

square wave signal, the frequency is

00:01:39

usually stable for me But the duty cycle, if

00:01:42

anyone doesn’t know what a well is, someone

00:01:44

changes the pulse width and varies

00:01:48

depending on what the

00:01:51

output voltage is. This is exactly the

00:01:53

feedback that turns out to be performed on

00:01:57

optocouplers, most often in order to decouple the

00:01:59

output voltage from the input voltage.

00:02:02

told them Well, whoever is

00:02:05

interested, you will find my videos in the playlist

00:02:08

on radio electronics, this is exactly what the

00:02:11

inverter control unit is responsible for,

00:02:13

after the inverter there is a

00:02:17

pulse power transformer, of course it is

00:02:20

made of ferrite, then again there is an

00:02:23

output rectifier, only there are no longer

00:02:25

4 diodes like a diode bridge, but one

00:02:29

diode at a time because the frequency is quite

00:02:30

high and then an ordinary

00:02:34

capacitor is enough to rectify it all into a

00:02:37

constant voltage, sometimes there are also

00:02:40

chokes that also additionally

00:02:42

filter the ripples of this voltage, so

00:02:46

it just shows the output

00:02:48

filter, which is most often on the inductor and the

00:02:51

circuit is taken from it reverse control

00:02:55

through an optocoupler and control of the pulse duty cycle.

00:02:58

This was a short excursion

00:03:01

into theory. Now let's return to our

00:03:03

power supply from the Tattoo machine

00:03:06

here. As you can see, there is also a PWM

00:03:09

controller. This is an optocoupler and the defect is

00:03:13

such that it simply does not turn on; find a

00:03:16

diagram of this power supply; I

00:03:19

don’t As a rule, this was not very successful and

00:03:22

we just need to first look at what kind of

00:03:24

PWM controller we have and find its circuit.

00:03:28

Here it is, the

00:03:30

circuit is quite simple

00:03:33

and what we see there are the

00:03:35

main components that are responsible for

00:03:38

the operation, this device is the controller itself,

00:03:41

diodes, electrolytic capacitors, that's

00:03:45

all we need and call to

00:03:48

understand what has gone wrong,

00:03:51

as it is clear that it is much more difficult to desolder a PWM controller

00:03:54

than other components,

00:03:57

and therefore we will start with electrolytic

00:03:59

capacitors and diodes, and as we see, I

00:04:03

immediately find a diode that shows a

00:04:06

short circuit, here it is in the diagram, this is the power supply

00:04:10

of the bus controller that is being formed on the

00:04:13

pulse transformer itself to

00:04:15

additional windings and it powers the

00:04:18

controller. Therefore, in order to accurately

00:04:20

determine that it is a diode or a

00:04:25

microcircuit or something that has come out. It is also advisable to

00:04:28

unsolder the leg of the

00:04:30

PWM controller that supplies power;

00:04:33

this can be done even without

00:04:35

completely desoldering the microcircuit; we just take a

00:04:38

medical needle with the end ground off and

00:04:43

solder the leg so that it does not

00:04:45

contact the contact pad, now

00:04:48

we measure and see that everything is fine, the

00:04:50

short circuit has disappeared and now all that remains is

00:04:54

to replace the microcircuit and check,

00:04:58

after checking it all works. So it’s

00:05:01

not difficult to repair any

00:05:04

power supply even if you have never they didn’t

00:05:07

do it, there’s nothing wrong with that,

00:05:09

the main thing is to be able to hold a soldering iron in your hands correctly,

00:05:13

or rather, to be able to solder and use

00:05:16

devices and know some basics of

00:05:19

electronics. I hope that at least

00:05:22

someone benefited from this video. Useful if it was useful.

00:05:25

Like it If you haven’t subscribed to yet

00:05:28

my channel Don't forget to subscribe And

00:05:30

with that, enjoy your viewing and

00:05:33

see you again

Description:

Прежде чем начать ремонт импульсного блока питания нужно разобраться как он устроен. Практически каждый блок питания устроен одинаково. Не считая маленьких различий. И прежде чем начать ремонт я предлагаю разобраться в блок-схеме. Поняв как устроен БП мы сможем разобраться и отремонтировать блок любого устройства. Всё это я покажу на примере блока питания тату машинки. Видео инструкция: Полезные советы ☀️ Если есть желание оказать помощь моему каналу Serg St ☀️ Мой счет в Приват Банке Интернет карта 4731 1856 0516 2525 Карта для выплат 4149 4998 0125 0463 На Степанова Сергея А Якщо потрібен КОМП'ЮТЕР - Вибирай найкращий http://shoping.vnsi.com.ua/shop/ Полезные вещи в вашу мастерскую Цифровой Мультиметр Mileseey NCV http://alii.pub/6i0n46 Цифровой Мультиметр MESTEK DM90 http://alii.pub/6i0na7 Цифровой Мультиметр NJTY Smart Ultra-thin http://alii.pub/6i0r6z Лабораторный БП на 120V/60V/30V 10A http://alii.pub/6i1ax3 Лабораторный БП на 120V/60V/30V 10A KUAIQU http://alii.pub/6i1bab Большой выбор Ковриков для пайки http://alli.pub/6i2wcm Коврик для пайки отличная цена http://alli.pub/6i2wup Можно ли заказать товар с Алиэкспресс в Украину? Китайский маркетплейс AliExpress с 15 июня возобновляет доставку товаров в Украину. Посылки можно будет получить через "Укрпочту" или "Новую почту". Об этом сообщили сами почтовые операторы. В "Укрпочте" уточнили, что доставка будет осуществляться транзитом через "одну из стран ЕС". Сайт http://schip.com.ua/ Мой Яндекс Дзен https://dzen.ru/serg_sv © Мой Телеграмм Канал https://t.me/azbuka_radioshem

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