Hi, welcome to product review by Robojax my name is Ahmed Shamshiri
in this video we are going to do the review of this tp5100
lithium battery charger for one or two cell.
i'm going to explain the module. i'm going to show you how to wire it
to one cell battery. and also then i'm going to show you how to connect it to
two cell battery and then i'm going to charge one battery
and measure the current and voltage for the
output and also voltage for the input' and then we are going to charge two
batteries and show you also the current' and then
i'm going to use a thermal camera to show you which spot is getting hot the
most' also i'm going to short circuit the
output and show you what happens if you short circuit it and also i'm
going to show you if you connect the polarity
incorrectly the positive and negative if you connect it in correctly'
let's get started with this'
this is the module you might see it with different colors but
the whole shape would be the same this is the main chip tp5100
is from Top Power ASIC from China. and we have an inductor there is a
schottky diode here and this has been labeled here clearly.
for the input they have labeled it as 5V to 15V
the chip can handle up to 18 volts but because of the capacitors here maybe
they have limited. these two are for the output.
these two terminals here you will solder them or making short circuit between
these two so you can connect two cell batteries
keep in mind that this is not a cell balancer. it will just
charge the battery and it doesn't know which cell for example if you connect
two cells you would not know which cell has lower
voltage or charged less and which one has the most. for that you
have to get a different module that can do. that this is just a very simple. it
can have different currents this is sold with
preset value of 2 ampere here we have resistors these
two resistors are in parallel and by changing these resistors you can
reduce the current.
if you go on aliexpress and search tp 5100
these are the search results that you get. you can even purchase the chip alone
but these are the modules that you can see you will see it as a black
green or red and the prices are depending on where you buy it from
would be 10 pieces for 10 or less or more. for example if i click on
this one you can see they are selling it for $0.81
cents canadian. this is around 60 cents or 70 cents u.s and they asked
for 6.76 for the shipping so you can get it
in between 50 to 30 business days. here the same store is selling it for
7.19 with 76 cents shopping but you will get it between 40
to 60 business days this will take like 90 days.
but you will receive it or you can select a higher shipping fee to get it
Datasheet Viewed
now let's have a look at the data sheet using google translated
page.
the rated current, the maximum current it can handle is 2 ampere which i'm
going to test it and show you. and if you set it for two cells
the voltage would be 8.4 volts the output voltage. and if you set it for one
cell it will be 4.2 volts for lithium battery.
input voltage has this this is rated for the chip
5 to 18 but on the module it is up to 15 volts.
the switching frequency is 400 kilohertz this is the frequency that the internal
converter will convert from 5V-18V volts to your battery
voltage and it will be turned on and off at this frequency
to reduce it. as you can see it says it has power mosfet for anti-flow back
which means the current will not go back from your
battery to the charger. we have two leds red for charging in our
case it will be blue that's for standby. and we have chipped
pressure protection which means if it heats up it will turn
off over current protection it will not allow
more current to pass through. and under voltage protection it will not allow the
voltage the input voltage when the voltage goes low
the output will turn off and it will prevent it.
has a battery temperature protection if you connect it from external circuitry
this does not apply to this module. battery reverse connection shutdown if
you connect the output incorrectly (which will show you next) it will shut it down.
and then you have short circuit protection if you short circuit the
output. (which you will see it next) it will protect it we have a 22 micro
henry inductor this inductor is 22 micro henry
and i remove this from this chip. so this is an inductor inside that is
just a wiring with a core. the maximum junction temperature is 120°C
degrees inside the chip the operating temperature is minus 40°C to
85° degrees celsius. this is for the storage
so pen temperature can go up to 260°C degrees. when you solder
it the welding time or soldering time of 10 seconds.
Schematic explained
and now let's have a look at the schematic when the configuration
is 4.2 volts or one cell. the input can be expected to go up to 5
volts because we expect 4.2 volts so it can go
lower. and here we have one battery
one cell. and this pin the pin 13 this is the charge select CS is
not connected to anywhere. when you power it up
this led will turn on this pin 14 will go low
so it will turn it on and when the charge starts
then this pin will go low and the red will turn
on. but if we use it for two cells and the output voltage will be two
battery and the voltage will be for 8.4 volts.
in this case because output is 8 we can have let's say 9 or 9.5 volts at the
input but here the example shows 12 volts and everything else is the same
with except this charged select pin is
connected to this pin and that causes the output
to jump to 8.4 volts. and you can connect two
cells here. and if you apply solder here and short
circuited it will work for two cells here are the three pins
that are available on the board. they are nothing but
the pins for the leds this pin on this side it is connected
directly to the charge pin. the last one is connected to the standby
pin , pin 14 or this side of led and this
the middle pin is connected to the resistor here
which i have shown it here just the anode of both of these.
so this is for the purpose that in case if you want to
turn on and off LED or something else when charge
is completed. so you can connect your own wires at these points.
and here i've soldered these two wires at these two points
so when i connect them the output voltage will be adjusted for
two cells.
Wiring Explained
and here for the wiring on this side we will connect
the the negative and the positive will be connected in here.
and here is how i've done it i've connected these two wires for the
input this is for my input and these two wires
are for the output. either if you connect it with two cells
or one cell this is the output but for the two cells you can solder it
here permanently if you're using two cells but in my case for the test
purpose i put this so i can twist this and create short
circuit here and now this will work for two cells. and
if i remove it
it will work for one cell. and here let me connect the power
currently there is no power when i turn it on
the blue led will turn on the output is not connected to anything.
these are just left without connection and now i'm going to connect the
positive to the positive this side is the positive and the
negative on this side when i connect it as soon as the charge starts it will be
uh it will become red.
let me show you my wiring the input is connected via these two wires
in here and i've connected the voltmeter so you can see it is 12.1 volts
at the moment. and the output these two wires will be connected
to the battery or i will show you also the current as it goes through my meter.
but i have also connected this to the output this
voltmeter so you can see the charge voltage. at the moment it
shows 4.1 volt i have not connected these two wires
these two points via this wire. now if i connect it
you will see that it will jump to 8.4. because this is 4.2 this is 4.1 and
something because this doesn't show so it become
2 cell and i'm going to connect two batteries later.
for now we will go with a one cell battery
Demonstration of charging 1 Cell battery
i have connected the meter the current meter
so the positive goes directly to this battery
this side is positive and the positive of that
goes here the output the negative goes here
and exits and this is my negative from the meter. and as you can see that's
the voltage let me connect it.
and that's the current that at the moment it is charging
amount of current directly related to the voltage of this battery
as the battery gets charged the voltage increases slowly
and uh well the current will decrease and finally it will shut off as you can
see. this current is now increase reducing
slowly because this is filling up.
now let me show you this one cell battery if we measure the voltage
as you can see it shows 3.7. if i connect it now
you will see that's the maximum current that this charger can supply.
and here is the thermal image as you can see
so the with in terms of temperature this inductor is getting hotter than the
chip and if the inductor gets hotter that's okay because there is nothing to
burn it's just a wire.
because now this is 3350 milliamp hour so you can divide the
capacity by this one this is 1920 and you will know how long
it will take so this one now would take about two hours.
to complete this if this was empty.
How to calculate: Charge current:1920mA, Battery capacity is 3350mAh
Charge time = Capacity÷(charge current)= 3350mAh÷1920mA=1.74h or 1 hour and 44 miutes
you can see voltage is slowly increasing perhaps it's 1
5 or something that's why it'sfluctuating
Demonstration of charging 2 cell batteries
and here how you connect the one battery
the positive will be to the battery terminal the negative will
be to the negative. so this is zero volts and 3.7(4.2V)
as they call it but once it gets fully charged it will be 4.2 volts the maximum
for the lithium. but here is how you connect the second
battery when you connect the second cell the positive of this will go to the
negative of the s2 or second cell and the voltage will
add up here with a 7.4 volts (4.2 x 2= 8.4V)
so we are going to connect our two cells like this.
and here is my 2nd battery. this positive goes to the
charger this is the negative i'm connecting here a connector.
here is how i have connected it. so this is my negative
for the charger and that's the positive. so to connect that first
i have to circuit these two wires so the output voltage is for two cell
so now it is ready for two cell because the voltage
increased. the negative i'm connecting it.
2 cell is being charged and as you can see the voltage has dropped here.
the reason for that is that one of the battery has low voltage and
the current is the current shows here. 1972 milliampere.
now the input current is 1.48A
and as you can see the hottest spot is the
actual chip not the inductor this spot so that's a hot spot actual chip.
but 84 degrees is not that critical for the chip
Demonstration of short circuit protection
now let's test the short circuit. protection maybe it's dying i'm just
going to do it and let's see if it smokes or it turns off.
now this is the maximum current that is passing through this and it
shut it down. perfect so the short circuit protection is working.
Demonstration of Battery reverse polarity protection
here now let's just connect the polarity incorrectly.
so the positive i'm going to connect it to the negative and
the negative i'm going to connect it to positive and see what happens
if it dies or not
you see it's just smoked.
so reverse polarity protection on the module did not work.
let's turn it off. and then let's connect it back.
and see if it works. i'm connecting the positive now to the
positive and negative in here and as you can see it is charging and
but i saw smoke so reverse polarity protection might not work.
because i saw smoke there.
I would like to thank my patrons from Patreon.com
Subtitle typed by Ahmad Shamshiri on Spe 29, 2020
I did my part to help you learn. now it is your turn. you can 🔔 subscribe and 👍 the video.
If you don't skip the ads, it will help me.
If you want to send cash donation, the link to my PayPal account is below this video in the description.
thank you for watching tutorial by robojax if you learned something and
found this useful please thumb up as this will help my
video in the search algorithm of youtube if you have comment or question please
post it in the comment section below i try to answer and reply and make sure
to subscribe as i will have a lot of other videos related to this topic
and
and here for the wiring on this side we will connect
the
you