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uc3842

00:00:04

[music]

00:00:19

welcome to the channel today we

00:00:22

will assemble such a switching power

00:00:23

supply, but this is a little ahead of ourselves,

00:00:25

so let's start from the beginning,

00:00:28

many will be able to notice, we decided to get

00:00:30

this video, you already have a power supply on a

00:00:31

3842 chip,

00:00:33

yes it is, well, first of all, we started series

00:00:36

professional different power supplies

00:00:37

we have already touched on 2 reverse running

00:00:40

simple on one transistor and on a

00:00:41

specialized microcircuit shadow

00:00:43

277 and it would be a shame not to tell again about the

00:00:46

c 3842 microcircuit, after all,

00:00:49

new viewers appear on the channel and

00:00:51

they write to me more and more often in private messages They

00:00:53

can’t assemble a power supply on

00:00:55

this particular chip, so I decided to

00:00:57

show five videos again what

00:00:59

and how happens in this power supply,

00:01:01

how it works, and I hope that this

00:01:03

will help someone,

00:01:04

so let’s look at this circuit again:

00:01:08

mains voltage 220 volts goes

00:01:11

to the diode bridge, then the

00:01:12

already rectified voltage goes to the capacitor

00:01:14

and it is charged, then the amplitude value

00:01:16

of 310 volts is the frequency of the driving circuit,

00:01:20

by selecting the ratings we

00:01:21

adjust the frequency of the power supply of the

00:01:23

microcircuit 7 leg is plus power the

00:01:27

fifth leg is minus power through the

00:01:29

high-resistance the

00:01:30

voltage resistor is supplied to the seventh leg and the

00:01:32

microcircuit receives a charge so that

00:01:34

it makes several pulses at the

00:01:37

output of the microcircuit, that is, on the 6th leg a

00:01:38

signal appears to control the field-effect

00:01:40

transistor, our power supply starts

00:01:43

up briefly and

00:01:45

voltage appears on the power winding itself, then

00:01:48

through the diode it is rectified and flowing

00:01:51

also on the seventh leg it is filtered by a

00:01:53

capacitor and thus our

00:01:55

power supply already powers itself, that is, in this

00:01:58

way our power supply begins to

00:01:59

work; at the output of the power supply,

00:02:02

voltage appears and with the help of a

00:02:04

divider we must apply two and a

00:02:06

half volts to the controllability of the

00:02:07

throne table tl431 while it is controlled at

00:02:11

two and a half volts, then the

00:02:12

zener diode is closed, well, as soon as this

00:02:15

threshold is exceeded, then the zener diode

00:02:16

must pass current through itself, this

00:02:18

will cause the sensor to light up the

00:02:20

diode in the up to paris

00:02:21

and it will light up the phototransistor on the

00:02:22

opposite side, the

00:02:25

first leg of the microcircuit is responsible for

00:02:27

stabilization voltage and microcircuit,

00:02:29

make sure that the voltage on this

00:02:31

leg does not fall below 1 volt and when, when

00:02:34

the voltage increases, our phototransistor

00:02:36

is illuminated, it will open and thereby

00:02:38

it will put the first leg on the ground,

00:02:42

thereby depending on the opening of this

00:02:44

phototransistor and the voltage drop on

00:02:46

1 leg

00:02:47

microcircuits control the pulse width

00:02:48

in this way and voltage stabilization is arranged; the

00:02:52

source of the field-effect transistor is connected to

00:02:54

ground through a

00:02:55

low-resistance resistor; this is a current sensor and

00:02:57

when the current in the circuit increases, but a voltage

00:03:00

drop is formed across this resistor, which in

00:03:02

turn is supplied to the third leg

00:03:05

when voltages higher are supplied to the third leg

00:03:07

1 volt then the microcircuit

00:03:21

will be blocked, thus you can limit the power of the power supply and also protect the power supply from short circuits, that is, if there is a short circuit, the voltage will constantly rise above 1 volt, the microcircuit will be blocked, this top

00:03:23

will drop when the current drops on the 3rd leg,

00:03:26

and the voltage will drop less than one

00:03:28

volt, the power supply will start and when it

00:03:30

rises again on the leg track, the

00:03:31

voltage will again be above 1 volt, and

00:03:33

so it will be cyclic until the

00:03:35

voltage on the leg track drops

00:03:37

constantly to less than one volt.

00:03:41

We sorted this out and there is probably a chain left,

00:03:43

but we’ll deal with it already when we

00:03:44

disassemble the transformer, I hope that I

00:03:47

explained everything clearly, but still, if you

00:03:48

have any questions, feel free to

00:03:50

write in the comments, but let's

00:03:52

move on to practice, taking this opportunity,

00:03:54

I want to recommend you an interesting

00:03:55

channel called cam'ron electronic,

00:03:57

the author makes good videos, it is developing,

00:04:00

I suggest you hold the electronics

00:04:02

go to the channel the link will be in

00:04:04

the description watch the video subscribe I think

00:04:07

that many will be interested I am often

00:04:10

asked if it is possible to assemble a power supply

00:04:11

on such and such cores is it possible to assemble on such and

00:04:13

such can be assembled on any

00:04:15

cores so I found this at home not quite

00:04:17

standard; more precisely, the

00:04:19

dimensions of this core are not in the

00:04:21

old man’s program, so today I

00:04:23

decided to show with the example of such a

00:04:24

core,

00:04:26

naturally we need to measure it and

00:04:27

try to measure it quite accurately, I

00:04:30

use a caliper for this, but

00:04:31

you can also measure with a ruler, try to be

00:04:34

quite accurate, we take all the sides and

00:04:37

programs for you tells you where and how to

00:04:39

measure

00:04:41

if you use an old core, then an

00:04:43

example from a computer power supply

00:04:44

or some other, it is often

00:04:46

stained with varnish, so this varnish

00:04:49

needs to be carefully cleaned so that the dimensions

00:04:50

are accurate; to

00:04:59

measure the core window,

00:05:02

I fold them unusually like this and then I can definitely

00:05:04

measure the distance it turns out to be 10 10

00:05:08

millimeters when we have written down all

00:05:10

the values, go to the program in the

00:05:13

program in the appropriate windows,

00:05:15

write down all the dimensions and also

00:05:16

write down the name of our core,

00:05:18

this is mandatory, by the way, at the very beginning, do not

00:05:20

forget to click add to the database, here are the

00:05:22

dimensions about the effective

00:05:24

permeability, I don’t know what it is this is

00:05:26

the core, so I carry the same as in

00:05:28

transformers, here are computer

00:05:30

power supplies. Now we click add a core to the database

00:05:32

and find it here in the database. Then

00:05:35

everything is pretty standard, but let’s

00:05:37

quickly go over the voltage we

00:05:39

usually have, and select the frequency with which

00:05:41

our power supply will operate. Naturally, we don’t

00:05:43

raise it and and the maximum voltage on the

00:05:45

switch and rds eon we look at the datasheet for this

00:05:47

field-effect transistor current density

00:05:49

the program recommends to us about four to

00:05:52

six I choose 6 in principle this is

00:05:54

acceptable

00:05:56

then we begin to figure out which

00:05:57

wire we will wind the primary

00:05:59

and secondary with this I chose the primary 04

00:06:02

for the secondary 056

00:06:03

and enter the voltage and current we want to

00:06:06

get from the power supply is 24 volts 4

00:06:09

amperes,

00:06:10

click calculate and get a

00:06:12

preliminary result, the required

00:06:15

non-magnetic gap turns out to be 056

00:06:17

millimeters, we have entered 1, so from

00:06:19

the theater we will correct it to for example 06,

00:06:23

this may be enough, you can

00:06:25

put 056 but not in there is no point in this,

00:06:27

we press calculate again and we already

00:06:30

get the turns we need 41, these are the

00:06:33

primary and it is enough to

00:06:36

wind the secondary winding with wire

00:06:39

056 into one core, we will have to add hv4 cores and pay

00:06:43

attention to the reverse voltage of 91 volts,

00:06:45

that is, we select the appropriate diode

00:06:47

from the reserve, then we move on to for the calculation of

00:06:50

Artsi Duck Vampire, we press calculate and

00:06:53

see that we have

00:06:55

the heat dissipation on the resistor one of the 7th,

00:06:57

then the resistor is r16 killam and the capacitor is 4

00:07:01

on the parade, then we look at the

00:07:04

resistance of the current sensor

00:07:05

033 com, this is important, we need it for

00:07:08

the circuit, and paying attention to

00:07:10

capacitor, that is, the minimum capacity

00:07:11

for a power supply is 119 microfarads, that is, you

00:07:14

can take the standard 120

00:07:16

microfarads, with the calculation of the transformer

00:07:18

figured out, I drew a printed circuit board and

00:07:20

already threw it to poison

00:07:21

me, they often write that

00:07:23

I don’t have the part values labeled on the printed circuit boards, so

00:07:25

hover your mouse over the part and the nominal value appears, the

00:07:28

printed circuit board straightened out, naturally

00:07:31

I drilled the board and marked

00:07:34

all the windings first, here, first

00:07:36

from another country, I started applying

00:07:39

the trans and I see on which leg I have the

00:07:41

beginning of the winding,

00:07:42

I’ve been used to doing this for a long time and it’s

00:07:44

much more convenient for me, then I figure out what kind of

00:07:47

winding I’ll have It’s more difficult to wind

00:07:49

naturally, this will be the output winding

00:07:51

where we have as many as four alive and

00:07:53

relatively the beginning of the winding and it’s advantageous to

00:07:56

wind in this direction in this direction

00:07:58

it turns out counterclockwise in

00:08:01

the transformer, all the windings are wound under

00:08:04

to the side and this was taken into account when

00:08:05

laying out the board

00:08:06

accordingly and the primary winding

00:08:08

should wind in the same direction and the

00:08:10

winding itself is the power supply 1 usual on the

00:08:13

matte winding itself, the power supply itself, firstly,

00:08:15

we don’t have the same requirements for it as

00:08:16

primary and secondary, secondly, roughly speaking, so that it does

00:08:19

n’t interfere, then that is,

00:08:21

I wound it and then I place the primary and

00:08:23

secondary as it should be here it is

00:08:25

wound in this direction, you can see where

00:08:27

the beginning is where the end is and then he would

00:08:30

guess the other three, that is, the three

00:08:33

legs that remain,

00:08:34

these will be two halves of the primary

00:08:36

winding, first the first half of the primary,

00:08:38

then the secondary

00:08:39

and then the second half of the primary wound the

00:08:43

first half of the primary, that is, we have in

00:08:45

total, forty-one turns,

00:08:46

to be honest, I wound 21 turns, don’t forget

00:08:49

to wind evenly along the entire length of the frame,

00:08:51

but with small ledges at the beginning and at

00:08:53

the end, when you need to wind some kind of

00:08:56

winding in several cores, for example, here

00:08:58

we have a secondary winding

00:08:59

and 4 are alive better than them wind in the form of a

00:09:02

tape, this is how I am now showing in the

00:09:04

video, this way the hood will be much

00:09:07

higher; the secondary winding is wound; now all that

00:09:10

remains is to wind the second part of the primary

00:09:12

winding before winding the transformer behind the scenes;

00:09:14

now we need to select the gap;

00:09:16

we assembled this inductance meter in

00:09:18

one of the previous videos; I

00:09:20

calibrated using different chokes,

00:09:22

now I think that its readings are

00:09:24

quite accurate. I will measure the

00:09:26

inductance of the primary winding only with the

00:09:27

help of this device, and in fact

00:09:29

this is quite enough,

00:09:32

I put 3 sheets of 4 on the edges of the transformer and

00:09:34

let's measure the inductance,

00:09:43

it turns out 346 micro henry, this is how

00:09:47

ours signs the corridor that

00:09:49

the program gave us was completely assembled

00:09:52

the transformer, it was true that it was attached to the planned

00:09:54

tape with tape, I think that it turned out pretty

00:09:57

well

00:09:58

after the tie and complete assembly of

00:10:00

the transformer, we need to make a control

00:10:02

measurement of the inductance since the halves

00:10:04

could be pulled together more tightly under the tape

00:10:06

than when they were pressed with our hands,

00:10:08

let's check it again, as you can see

00:10:14

inductive became a little bit higher it was

00:10:15

346 now 350 micro henry but we also

00:10:20

enter that corridor in this

00:10:23

power supply there are also few parts so

00:10:24

it was assembled quite quickly here is our

00:10:26

transformer and the rest of the time and

00:10:29

fluff it turned out quite nice I

00:10:32

like how this power supply looks

00:10:33

The only thing, of course, is that the radiators are

00:10:36

temporary, but the interlinear choke I wound up

00:10:40

hastily, it’s possible that I’ll need to rewind

00:10:42

also the capacitor is too high for

00:10:45

this power supply, they

00:10:46

look harmonious, but I have

00:10:48

n’t found another one in stock yet, but all this is

00:10:51

actually not significant since

00:10:53

I’m making this power supply only for demonstration,

00:10:55

I won’t use it in any way, I do

00:10:57

n’t need it at all,

00:10:59

let’s check how it works

00:11:01

after assembly, be sure to wash off

00:11:04

the flux and check for errors during installation,

00:11:05

also be sure to turn it on for the first time through a

00:11:08

light bulb, this is not the first time

00:11:10

I’ve turned it on I checked everything behind the scenes, but nevertheless

00:11:13

there should be rules that the first switching on is

00:11:14

always through the light bulb, it blinked,

00:11:17

the LED lit up everything is correct,

00:11:19

let's see that at the output

00:11:24

24 volts everything is as expected, the voltage

00:11:27

remains stable

00:11:28

after making sure that the

00:11:31

power supply is working normally with the light bulb,

00:11:32

then you can remove from the zeppel since

00:11:34

under load it is

00:11:36

undesirable to turn on the weakling, we won’t load this with a soldering

00:11:38

iron like this

00:11:39

24 volt 75 watt here is described 2475

00:11:45

this is some kind of old soldering iron it is quite

00:11:48

powerful already with such a dead tip,

00:11:51

but nevertheless it works sometimes very

00:11:53

massive parts

00:11:54

I I’ll go with it, I didn’t find 2

00:11:57

watt resistance for the load

00:11:59

resistor of the required value, so

00:12:01

I put 1 watt on it and this resistance gets

00:12:03

quite noticeably heated, let’s

00:12:06

check how much the voltage sags

00:12:08

under load, so we look at

00:12:14

idle and now 2387

00:12:30

we connect the soldering iron and the voltage

00:12:33

dipped a little later in In the process of

00:12:36

editing the video, I realized that the voltage

00:12:38

sags precisely at the inductor, that is,

00:12:40

the inductor must be rewound, but the

00:12:44

voltage is kept quite stable in principle

00:12:46

and this suits me quite well,

00:12:50

but let’s see what current flows in the

00:12:53

circuit:

00:13:02

3 amperes and almost 100 milliamps

00:13:06

corresponds to the declared 75th unit there

00:13:10

power works no sounds countries

00:13:12

there is nothing to achieve everything works

00:13:17

let's measure the temperature since the

00:13:19

radiators are

00:13:20

very very weak so far everything is

00:13:24

good and the switching on was short-lived

00:13:31

let's connect the load and under

00:13:33

load we will measure the temperature it's

00:13:44

already starting to rise 40 but this is

00:13:48

natural

00:13:56

and the temperature is rising because that

00:13:57

there are no radiators, now

00:14:01

check the power supply for a short

00:14:03

circuit,

00:14:04

if you accidentally short-circuit the output or

00:14:07

something happens to the load, then the

00:14:08

power supply will behave like this, it drains

00:14:12

as I described at the very beginning from the

00:14:16

power supply the short circuit is experiencing, I

00:14:20

decided to connect the load to

00:14:21

longer time for the soldering

00:14:24

iron to warm up and melt the solder with it, the

00:14:27

diode and transistor can overheat,

00:14:29

so the temperature needs to be controlled

00:14:39

[music]

00:14:45

by the way, this meter is kind of strange

00:14:48

about the transformer timer, it shows

00:14:49

50 degrees, touch it with your finger and it’s

00:14:51

cold,

00:14:52

that is, it’s not clear what it measures, but at least

00:14:55

something is already melting,

00:15:03

now I’ll focus and look, the

00:15:07

solder melts without problems, it’s just that there are

00:15:09

n’t enough normal heatsinks and

00:15:11

finally, I also want to measure the

00:15:14

voltage adjustment range, let’s first

00:15:16

go down, it’s already

00:15:19

cicadas, so 19 8 is the lower limit

00:15:23

19 6 now let’s go up

00:15:30

too much you can’t go to the top

00:15:32

because there is a 35 volt capacitance and a

00:15:35

load resistance of 1 watt; when the

00:15:37

voltage increases, it will

00:15:39

overheat even more, so 30 30 volts without

00:15:43

problems, but I’m sure you can go

00:15:44

higher for today, that’s all I hope I

00:15:47

was able to answer for some questions

00:15:49

that beginners may have in

00:15:51

assembling switching power supplies, do not

00:15:54

forget to rate the video with a like or

00:15:55

dislike, subscribe to the channel

00:15:57

if you have any questions or

00:15:59

comments, write in the comments first,

00:16:02

I wish you all the best, good luck, and bye to everyone

00:16:06

[music]

Description:

Приветствую Вас на канале! Сегодня мы рассмотрим следующий блок питания. Соберем обратноходовой стабилизированный блок питания на микросхеме UC3842. В видео будет подробное описание схемы и принципа работы, намотка трансформатора. Если после просмотра видео останутся вопросы - пишите в комментариях. Всем приятного просмотра! Канал Камрон электроник: https://www.youtube.com/channel/UC2FD53C67VMMITCbRF6GzoQ/videos Схема и печатная плата: https://drive.google.com/drive/folders/1WJa3CRCjn-9O76SZPnGoxrHf2OwIaw15?usp=sharing

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Which format of "Импульсный блок питания своими руками. UC3842" video should I choose?

The best quality formats are FullHD (1080p), 2K (1440p), 4K (2160p) and 8K (4320p). The higher the resolution of your screen, the higher the video quality should be. However, there are other factors to consider: download speed, amount of free space, and device performance during playback.

Why does my computer freeze when loading a "Импульсный блок питания своими руками. UC3842" video?

The browser/computer should not freeze completely! If this happens, please report it with a link to the video. Sometimes videos cannot be downloaded directly in a suitable format, so we have added the ability to convert the file to the desired format. In some cases, this process may actively use computer resources.

How can I download "Импульсный блок питания своими руками. UC3842" video to my phone?

You can download a video to your smartphone using the website or the PWA application UDL Lite. It is also possible to send a download link via QR code using the UDL Helper extension.

How can I download an audio track (music) to MP3 "Импульсный блок питания своими руками. UC3842"?

The most convenient way is to use the UDL Client program, which supports converting video to MP3 format. In some cases, MP3 can also be downloaded through the UDL Helper extension.

How can I save a frame from a video "Импульсный блок питания своими руками. UC3842"?

This feature is available in the UDL Helper extension. Make sure that "Show the video snapshot button" is checked in the settings. A camera icon should appear in the lower right corner of the player to the left of the "Settings" icon. When you click on it, the current frame from the video will be saved to your computer in JPEG format.

What's the price of all this stuff?

It costs nothing. Our services are absolutely free for all users. There are no PRO subscriptions, no restrictions on the number or maximum length of downloaded videos.