Download "Принцип работы контроллера заряда BQ24725 от Texas Instruments"

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bq24725

pwm

шим контроллер

принцип работы контроллера заряда. принцип работы шим контр...

не заряжается ноутбук. почему не заряжается. контроллер li-ion

li-ion

li-pol

Ремонт ноутбука

Не включается ноутбук

Замена южного моста

Нет видео

Прожарка

Замена видеокарты на ноутбуке

Реболл

зависает ноутбук

usb

как восстановить батарею

нет картинки

не включается

пост карта

ремонт залитого ноутбука

залили пивом

не работает от зарядного

post code

00:00:00

Hello everyone, in this video we will try to

00:00:02

understand the bq 2725 charge controller

00:00:05

from the manufacturer teas Instruments.

00:00:09

This controller is designed to

00:00:12

charge from two to four elements of

00:00:15

lithium-ion batteries, and in this

00:00:18

document we will not focus on the

00:00:22

description and technical characteristics

00:00:25

of this controller because here everything is

00:00:28

quite clearly described in this

00:00:30

document and our main focus will be

00:00:33

on the circuit design, we will look at what

00:00:38

controller pins we have that are responsible for what

00:00:40

and

00:00:41

accordingly we will talk about the main

00:00:44

power elements and we will also figure out

00:00:47

what they are responsible for in this circuit in this

00:00:51

Dasha we have two typical

00:00:54

switching circuits, the first circuit is this

00:00:57

circuit and the second circuit is here, and the main

00:01:01

difference between them is in the input

00:01:04

circuit. The input circuit in the first version

00:01:08

consists of two-channel field-effect

00:01:11

transistors, Q1 and Q2, respectively, and in the

00:01:15

second version, the Input circuit ours

00:01:17

consists of an input diode D3 and one

00:01:22

channel field-effect transistor, as a

00:01:24

rule, in laptop charging circuits the

00:01:27

first connection option is used, that

00:01:30

is, with a dm - channel at the input, so

00:01:34

we will consider this circuit

00:01:37

as the main one. So let's try

00:01:40

to understand the purpose of the terminals of

00:01:43

this charge controller And let's start

00:01:45

with the input circuit. To the input circuit in this

00:01:49

controller we can include the acn ACP cmrc pins

00:01:58

and, perhaps, we'll start with the

00:02:03

ACD pin. If you look carefully, we have a

00:02:09

voltage divider connected to the ACD pin, formed by resistors R1 and

00:02:13

R2, respectively. We have R 2 connected

00:02:18

between ACD pin and ground, and R1 is

00:02:22

connected between the ACD pin and the input

00:02:26

voltage of the power supply in

00:02:28

laptops, as a rule,

00:02:30

p1 V is supplied to this point. That is, this is the voltage

00:02:35

that we directly come from the laptop

00:02:38

power adapter connector,

00:02:40

respectively, setting the values of

00:02:44

resistors R1 and R2 you can set such a

00:02:49

threshold of the input supply voltage at

00:02:52

which this controller will consider the

00:02:55

input voltage to be

00:02:57

normal and, accordingly, open the

00:03:00

corresponding keys a C Fet and RB Fet And

00:03:04

thereby supplying voltage from the

00:03:08

power adapter directly to the

00:03:10

circuit itself, so for this controller bq

00:03:16

2725 the voltage on The

00:03:19

ACD pin should be in the range from

00:03:24

2.4 to

00:03:27

3.15 V. In this range, this

00:03:31

controller considers the input voltage

00:03:34

to be normal and, accordingly, supplies this

00:03:38

voltage to the device itself in

00:03:41

which this controller is installed and

00:03:44

also to the battery charging circuit.

00:03:46

So, with the ACD pin We in

00:03:50

general, we figured it out further. Let's

00:03:53

see what the ACD output is responsible for,

00:03:57

or look at the adv output through a

00:04:04

resistor r10 with a nominal value of 4 Coma, the

00:04:07

gates of these two

00:04:11

input field-effect channel transistors are connected,

00:04:14

that is, the AC drv output, which can be

00:04:18

deciphered as AC dri controlling the

00:04:21

input voltage of the AC adapter, this

00:04:25

pin is responsible for opening

00:04:28

these input field switches that are located

00:04:32

in the input circuit. The distinctive

00:04:35

feature of this controller

00:04:38

is that it can control -

00:04:41

channel field-effect

00:04:43

transistors, let me remind you in order to

00:04:46

open - channel field-effect transistor

00:04:49

the voltage at its gate now I’ll

00:04:52

take a closer look at our channel

00:04:54

field-effect transistor, the voltage at its

00:04:57

gate at this point should be

00:05:00

greater than the voltage at the Source when

00:05:04

the transistor opens,

00:05:07

respectively, the voltage at the Source and at the

00:05:10

Source will be equal to the voltage of the

00:05:13

power adapter, that is, the voltage at the drains and

00:05:17

sources here of this transistor in the open

00:05:20

state will be equal to 19 V, and in order for

00:05:23

this transistor to be open, the

00:05:27

voltage on its cell gate

00:05:30

must be more than 19 V. In this

00:05:33

circuit, there is no place to get a voltage greater

00:05:37

than 19 V, so for the formation of

00:05:40

this voltage just the

00:05:44

hell pin responds, which generates a voltage

00:05:48

greater than the voltage at the Source by an

00:05:52

amount of about 6 V. That is, if

00:05:58

we have the input voltage of the power adapter,

00:06:00

then at the hell pin the microcircuit will generate a

00:06:04

voltage of the order of 25 V, and with this same

00:06:08

opening voltage,

00:06:11

we respectively control these two

00:06:14

field inputs transistor respectively Q1 and

00:06:18

Q2 output

00:06:22

cms RC it is precisely necessary for the

00:06:26

formation of the control voltage AC,

00:06:30

that is, the voltage is 6 V greater than the

00:06:34

input voltage from the power adapter. The

00:06:37

use of channel transistors in the input circuit is most

00:06:40

likely due to the fact

00:06:42

that the parameters of y-channel transistors are

00:06:46

usually is significantly better than the

00:06:48

corresponding parameters of n channel

00:06:52

transistors and is connected with the

00:06:55

production technology of these transistors,

00:06:57

for example, the

00:06:58

DS on parameter, that is, the resistance of the

00:07:01

open channel of the transistor y -

00:07:04

channel transistors is always

00:07:06

significantly better than that of respectively

00:07:10

n channel transistors. Most likely, the

00:07:12

use in the input circuit is connected with this -

00:07:16

channel transistors Let's now

00:07:19

figure out why it is

00:07:22

necessary to use two channel

00:07:26

transistors in the input circuit Why it was impossible to get by

00:07:28

with one transistor We see that the sources of

00:07:32

these transistors are connected to

00:07:35

each other, respectively, the input voltage

00:07:38

is supplied to the drain of transistor Q1 and Fet and the

00:07:43

output voltage is already removed from the

00:07:46

drain of transistor Q2 RB

00:07:51

Fet The fact is that in the structure of the field-effect

00:07:54

transistor there is a parasitic diode

00:07:57

for the - channel transistor. The cathode of this

00:08:00

diode is connected to the drain and the

00:08:04

anode is connected to the source and Let's

00:08:07

imagine that, for example, we have

00:08:09

only one transistor Q1 Afet and

00:08:13

there is no transistor Q2 Fet, looking ahead to

00:08:16

that here at this point we

00:08:19

can have the voltage of both the

00:08:22

power adapter, that is, if we have the power adapter

00:08:25

connected, then at this point there will be

00:08:27

the voltage of the power adapter and the

00:08:29

voltage taken from the battery. That is,

00:08:32

if we have the input adapter disconnected, then

00:08:35

this doormat opens and

00:08:38

accordingly, at this point System we

00:08:41

have a battery voltage, so let’s

00:08:44

imagine that, for example, we

00:08:46

don’t have this transistor,

00:08:48

so for this, the

00:08:51

voltage that we get

00:08:53

is taken from the battery. Here is the System line, it is

00:08:58

applied to the source of this

00:09:02

field-effect transistor, respectively, it is

00:09:04

applied to

00:09:06

the anode of the parasitic diode of this

00:09:09

transistor And for this voltage this

00:09:13

diode is turned on. We have a situation in the forward direction

00:09:16

that the

00:09:19

voltage from the battery will

00:09:22

go to the output of the power adapter, which

00:09:26

in principle is not very

00:09:28

good. A similar situation will happen if

00:09:31

we, for example, remove transistor Q1 afd,

00:09:36

respectively then for this

00:09:40

transistor, the parasitic diode will be

00:09:42

connected with the cathode to the drain and the

00:09:47

anode, respectively, to the source. And for

00:09:50

this input voltage, this

00:09:54

diode will be connected in the forward direction.

00:09:58

Accordingly, the circuits will no longer be able to

00:10:01

properly control the input

00:10:03

voltage and what kind of input

00:10:06

voltage it was not through this

00:10:09

parasitic diode

00:10:11

that is present in this transistor, it will

00:10:14

go to the System line, which

00:10:19

again is not very good,

00:10:21

so we can say that

00:10:23

we have the AC Fet transistor

00:10:29

and the RB Fet transistor

00:10:32

prevents the

00:10:35

supply voltage from the battery from entering the adapter circuit

00:10:40

power supply further We have two

00:10:44

ADC pins and acn, respectively, the abbreviation a

00:10:49

tells us that these pins are

00:10:51

responsible for working with the input part, that

00:10:54

is, a of the power adapter, respectively P

00:10:58

and N - this is an abbreviation for positive and

00:11:01

negative Therefore, these pins We

00:11:04

have nothing nothing more than an amplifier with a

00:11:08

non-inverting and inverting input to the

00:11:11

input of which we have connected this

00:11:15

resistor

00:11:17

rac, this is basically a current sensor and due to the

00:11:21

drop in voltage on this

00:11:24

current sensor, our controller determines how much

00:11:28

power

00:11:29

we consume from the power adapter and

00:11:32

accordingly this is needed to implement the

00:11:37

protection function, we have

00:11:40

more or less

00:11:41

figured out the input circuit further. We have a

00:11:45

pin,

00:11:46

which means that through this pin the

00:11:50

current limit is programmed by

00:11:52

which our battery will be charged,

00:11:57

set by the resistor here, this

00:12:01

voltage divider resistor r7 and

00:12:06

R8 further We have two digital lines,

00:12:12

this is sda and SC, respectively, we have these lines

00:12:16

pulled up through resistors R5 and R4 to the

00:12:20

3.3 V line and along this digital line

00:12:23

we generally carry

00:12:25

out data management and

00:12:30

we also have a pin on this

00:12:34

pin. We must have a

00:12:37

high logical level if the

00:12:41

PWM controller is operating, everything is fine. That

00:12:43

is, when we have a normal input

00:12:46

supply voltage of the controller, the

00:12:48

normal voltage at the ACD pin and,

00:12:51

accordingly, under these conditions, a

00:12:54

high level appears at the a o pin;

00:13:00

this pin we have is an open

00:13:03

collector type, that is, for this purpose so that there

00:13:05

is a high logical level here, this

00:13:07

pin must be pulled up to

00:13:10

positive and we see that here the pull-up

00:13:13

is due to resistor R5,

00:13:16

the next pin we have is I Out, this pin

00:13:21

is necessary for us to determine the currents

00:13:24

consumed from the power adapter and the

00:13:27

battery charging current, these are these

00:13:31

voltages that are taken from the

00:13:34

RC current sensors and the RSR charge sensor,

00:13:39

these voltages are translated to the

00:13:43

I Out pin and, using an analogue

00:13:46

digital converter, are accordingly

00:13:48

converted into digital form and

00:13:51

thus the host determines the

00:13:53

consumed current accordingly. The current

00:13:56

along the power adapter line is the

00:14:00

current consumed, more precisely the charging current.

00:14:04

batteries and so on Let's look at the

00:14:07

charging circuit of the battery itself, which means that the

00:14:12

charging circuit includes the terminals of the joint venture

00:14:17

srn, which are connected to the current sensor

00:14:21

rsr and due to the voltage drop on this

00:14:27

current sensor, we determine the current with

00:14:30

which our battery is currently charging, and

00:14:33

we also we see

00:14:36

that we have here in the circuit

00:14:39

- channel field-effect

00:14:42

transistors Q3 and Q4 are, respectively, a

00:14:46

standard PWM buck converter

00:14:48

Q4 is the

00:14:52

lower arm, respectively, and Q3 is the Upper

00:14:56

arm, the Low dri pin is the

00:15:00

gate control, respectively, the lower arm, and the

00:15:03

High dri pin is Accordingly, the

00:15:06

control of the gate of the upper arm, the phase pin,

00:15:12

is connected, respectively, to the drain of the

00:15:14

lower arm and the source of the upper arm. At

00:15:19

this point, we have a pulse

00:15:23

voltage, which is also supplied through

00:15:26

the capacitor C7 to the BT pin,

00:15:31

this is the

00:15:33

bootp pin and this pin is necessary to

00:15:37

generate the opening voltage.

00:15:40

of this upper field-effect transistor,

00:15:43

respectively, we also have diode D1 involved in the

00:15:45

formation of this Boot voltage,

00:15:50

and we must have this diode with a

00:15:54

fast-acting

00:15:57

output

00:15:59

N - this is the 6 V output of the LD stabilizer.

00:16:03

So what we still have here is

00:16:06

we also have this one here is transistor Q5,

00:16:10

which is responsible for switching the

00:16:13

battery voltage in the

00:16:16

absence of voltage from the

00:16:19

power adapter. That is, when we have a

00:16:22

power adapter connected, we have open

00:16:25

transistors Q1 Q2, respectively, we have all the

00:16:28

voltage of the power adapter.

00:16:31

Here at this point System That

00:16:33

is, if we are talking For example, about

00:16:35

laptops, then at this point we will have p1

00:16:39

V, respectively, if we have a

00:16:41

power adapter connected, then this transistor

00:16:44

should naturally be closed,

00:16:47

because if it is open, then the entire

00:16:49

voltage of the power adapter 19 V will go

00:16:54

to the battery and, accordingly, the battery charge current

00:16:57

us will be excessively

00:16:59

large That is, when we

00:17:02

have power from the adapter, this transistor

00:17:05

must be closed, and

00:17:08

if our battery is discharged, then

00:17:11

accordingly we have this

00:17:13

PWM converter working on transistors Q3

00:17:16

Q4 and inductor L1, now let’s

00:17:20

assume that Our power adapter is

00:17:23

disconnected, respectively, in the System line

00:17:26

we will have voltage and in order for

00:17:29

our device to work, an opening voltage appears at pin B dri

00:17:34

for

00:17:36

this field-effect transistor,

00:17:38

respectively, our transistor

00:17:39

opens and all the voltage with the

00:17:42

power battery is supplied again

00:17:45

to the line System and we have the last

00:17:50

pin left

00:17:51

in which means this is the supply voltage of the

00:17:56

controller itself and As we can see, the voltage can be

00:17:59

supplied both from the System line and from the

00:18:04

input voltage of the

00:18:07

power adapter Well, that’s all regarding

00:18:10

the circuitry of this battery charge controller

00:18:13

I hope all of the above was

00:18:18

understandable to everyone thanks for your attention

00:18:21

bye

Description:

В этом видео разберемся с назначением выводов и принципом работы контроллера заряда Li-ion BQ24725. Больше видео тут https://dzen.ru/id/5f377551708c8d5df525a586 Набор в группу обучения основам электроники и ремонта. https://vk.com/hamradio1986 Стоимость обучения 1500 руб Для благодарности и поддержки канала: карта Сбер 639002529037338341 Перевод по номеру мобильного 8-928-7610692

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