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Tp4056 reverse voltage protection
#11
I already killed 10th of those by not paying attention when putting them in. My solution: Snce they're dirt cheap, buy more and replace the ones you killed  Big Grin

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#12
Why buy more, even though they are cheap, when you can get some schottky's for 100's for a few dollars and put them in place. I know it will take a few extra parts than just the diodes, as the charge controller needs to take readings to know how much voltage is in the cell which requires feedback to the chip.

Or, since the cells have a dimple around the positive end of the cells, make sure that end is "always" pointing to the positive end of the holder.
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#13
(06-03-2017, 02:01 AM)Korishan Wrote: Why buy more, even though they are cheap, when you can get some schottky's for 100's for a few dollars and put them in place. I know it will take a few extra parts than just the diodes, as the charge controller needs to take readings to know how much voltage is in the cell which requires feedback to the chip.

Or, since the cells have a dimple around the positive end of the cells, make sure that end is "always" pointing to the positive end of the holder.

If you get the reverse polarity protected ones, do you still need the schottky diodes?
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#14
I've looked at several of those TP's boards, and I haven't seen any that are "reverse polarity protected". There is a protection circuit, but that's not for polarity. That's for under/over voltage. Mostly for under-voltage as that board is designed to have the load go "through" the board. It's a protection to keep the 18650 from being drained below a set amount (not sure what this atm).
In the description of several of those units, it specifically states to not get polarity wrong as it may blow the chip. I take that as there is not polarity protection. If there were, there'd not need to be that warning.

I was thinking and remembering from youtube, you'd kind of need to have a dual diode setup so that no matter how the power came in, it went to the correct ends of the cell. There are several schematics for polarity protection boards. With and without led warning lights. The reason for the schottky diodes is they are better at handling the loads of charging with little power loss. A diode by it's very nature will lose some power to heat. Schottky's are better than standard diodes.
Proceed with caution. Knowledge is Power! Literally! Cool 
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#15
Korishan it's reverse polarity protection, all the tp4056 variants have under/over volt protection. I would have a lot of dead tp4056 if it didn't have reverse polarity protection. Protection is limited to 3A though, so if you do it with a deadish cell it should be fine, a cell with a reasonable charge could definitely do more than 3A burst. 

Also not sure if people are aware of this but there's a resistor that controls charge current, you can either replace the resistor to lower current or wire a potentiometer to have variable charge current, add a volt/current display and it's quite nice, especially for bringing up low V cells. Resistor settings in the datasheet
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#16
(06-02-2017, 09:30 PM)Robert Baumer Wrote: I guess this is it for the US folks

10PCS Micro USB 5V 1A 18650 Lithium Battery Charger Board With Protection Module

http://www.ebay.com/itm/10PCS-Micro-USB-...Swvg9XdxhI

Thanks for the Link Robert!  I ordered some today.  I ordered extra so I can test what happens when you hook them up backwards.

I will do a side by side test of an unprotected and protected circuit board. Maybe even a video?

Should take about 3 weeks to get them.
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#17
Reverse Polarity "Protection" is not the same as "Tolerant"

The TP variant that has the protection modules are NOT "Polarity" protected. The only reason it works at low voltage is because of the VG voltage required to turn on the dual mosfets. However, if you were to leave that weak cell plugged in, it would eventually burn out the chips.

You can get a better view and explanation of this particular module on Julians video on this particular module. He discusses a bit of the datasheet at the beginning of the video. Note, the datasheet does NOT say "Reverse Polarity Protection", but mentions "Over-Charge" or "Over-Discharge" protection.

[video=youtube]https://youtu.be/Qw4psECqpwI[/video]

As you said:
Quote:I would have a lot of dead tp4056 if it didn't have reverse polarity protection. Protection is limited to 3A though, so if you do it with a deadish cell it should be fine, a cell with a reasonable charge could definitely do more than 3A burst.

If it was reverse "polarity" protected, it would be able to handle a better amp, and would be able to handle a "reasonable charged" cell. If it can only handle a "deadish" cell, then it's not reverse polarity protected.

Also: If you jump to time index 11min44secs of the video, Julian specifically talks about the protection portion of the board.
Quote:"A new board with an unprotected cell is equivalent to the old board with a protected cell because the protected cell has those battery protection components inside it so they don't need to be on the charger board. In the case of the bottom board, the protection components are on the board so they don't have to be in the cell."

I have never heard of a battery protection circuit that is on the cell (aka CID) that is reverse polarity.

If you want to get the most out of your TP4056 charging modules, make sure you do not plug them in backwards. Each time you stress the chips, you weaken their ability to function properly. Sure they are cheap modules, but why waste money on replacement parts from laziness. The 18650's are easily recognizable as which end is positive and which is negative. The positive has a button like raised end just like "any" other common battery. And they even have a crease around the positive end as well. How can you not see that? Even a blind person could put these cells in a charger the correct way.

Ok, that was my rant for the week. Please continue with your regularly scheduled charging/building
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Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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#18
(06-03-2017, 12:45 PM)Korishan Wrote: Reverse Polarity "Protection" is not the same as "Tolerant"

The TP variant that has the protection modules are NOT "Polarity" protected. The only reason it works at low voltage is because of the VG voltage required to turn on the dual mosfets. However, if you were to leave that weak cell plugged in, it would eventually burn out the chips.

You can get a better view and explanation of this particular module on Julians video on this particular module. He discusses a bit of the datasheet at the beginning of the video. Note, the datasheet does NOT say "Reverse Polarity Protection", but mentions "Over-Charge" or "Over-Discharge" protection.

[video=youtube]https://youtu.be/Qw4psECqpwI[/video]

As you said:
Quote:I would have a lot of dead tp4056 if it didn't have reverse polarity protection. Protection is limited to 3A though, so if you do it with a deadish cell it should be fine, a cell with a reasonable charge could definitely do more than 3A burst.

If it was reverse "polarity" protected, it would be able to handle a better amp, and would be able to handle a "reasonable charged" cell. If it can only handle a "deadish" cell, then it's not reverse polarity protected.

Also: If you jump to time index 11min44secs of the video, Julian specifically talks about the protection portion of the board.
Quote:"A new board with an unprotected cell is equivalent to the old board with a protected cell because the protected cell has those battery protection components inside it so they don't need to be on the charger board. In the case of the bottom board, the protection components are on the board so they don't have to be in the cell."

I have never heard of a battery protection circuit that is on the cell (aka CID) that is reverse polarity.

If you want to get the most out of your TP4056 charging modules, make sure you do not plug them in backwards. Each time you stress the chips, you weaken their ability to function properly. Sure they are cheap modules, but why waste money on replacement parts from laziness. The 18650's are easily recognizable as which end is positive and which is negative. The positive has a button like raised end just like "any" other common battery. And they even have a crease around the positive end as well. How can you not see that? Even a blind person could put these cells in a charger the correct way.

Ok, that was my rant for the week. Please continue with your regularly scheduled charging/building

Well I need some help from blind people, because I put them in backwards all the time. I want them to be dummy proof. 

When I'm loading 20 cells and trying to be quick about it, it happens.

(06-03-2017, 04:19 PM)egam Wrote:
(06-03-2017, 12:45 PM)Korishan Wrote: Reverse Polarity "Protection" is not the same as "Tolerant"

The TP variant that has the protection modules are NOT "Polarity" protected. The only reason it works at low voltage is because of the VG voltage required to turn on the dual mosfets. However, if you were to leave that weak cell plugged in, it would eventually burn out the chips.

You can get a better view and explanation of this particular module on Julians video on this particular module. He discusses a bit of the datasheet at the beginning of the video. Note, the datasheet does NOT say "Reverse Polarity Protection", but mentions "Over-Charge" or "Over-Discharge" protection.

[video=youtube]https://youtu.be/Qw4psECqpwI[/video]

As you said:
Quote:I would have a lot of dead tp4056 if it didn't have reverse polarity protection. Protection is limited to 3A though, so if you do it with a deadish cell it should be fine, a cell with a reasonable charge could definitely do more than 3A burst.

If it was reverse "polarity" protected, it would be able to handle a better amp, and would be able to handle a "reasonable charged" cell. If it can only handle a "deadish" cell, then it's not reverse polarity protected.

Also: If you jump to time index 11min44secs of the video, Julian specifically talks about the protection portion of the board.
Quote:"A new board with an unprotected cell is equivalent to the old board with a protected cell because the protected cell has those battery protection components inside it so they don't need to be on the charger board. In the case of the bottom board, the protection components are on the board so they don't have to be in the cell."

I have never heard of a battery protection circuit that is on the cell (aka CID) that is reverse polarity.

If you want to get the most out of your TP4056 charging modules, make sure you do not plug them in backwards. Each time you stress the chips, you weaken their ability to function properly. Sure they are cheap modules, but why waste money on replacement parts from laziness. The 18650's are easily recognizable as which end is positive and which is negative. The positive has a button like raised end just like "any" other common battery. And they even have a crease around the positive end as well. How can you not see that? Even a blind person could put these cells in a charger the correct way.

Ok, that was my rant for the week. Please continue with your regularly scheduled charging/building

Well I need some help from blind people, because I put them in backwards all the time. I want them to be dummy proof. 

When I'm loading 20 cells and trying to be quick about it, it happens.
Korishan, I looked up schottkey diodes.  The forward current voltage drop is 0.6V at 1 amp.   A lithium ion charging circuit can Not tolerate a .6 volts drop. I'm not sure how you were using it?
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#19
Schottky Diodes can have many Vf ranges. However, for our application, you can them as low as 600mV

http://www.mouser.com/ProductDetail/Vish...AmraaXE%3d

Quote:Product: Schottky Diodes
Mounting Style: Through Hole
Package / Case: DO-35
If - Forward Current: -
Vrrm - Repetitive Reverse Voltage: 20 V
Vf - Forward Voltage: 600 mV
Ifsm - Forward Surge Current: 15 A
Configuration: Single
Technology: Si
Ir - Reverse Current: 5 uA
Maximum Operating Temperature: + 125 C
Brand: Vishay Semiconductors
Height: 1.7 mm
Length: 3.9 mm
Operating Temperature Range: + 125 C
Pd - Power Dissipation: 400 mW
Termination Style: Through Hole
trr - Reverse Recovery time: 10 ns
Type: Small Signal Schottky Diode
Vr - Reverse Voltage: 
20 V

So, as you can see, a Schotty could be used in our application. That diode also has a 20V reverse protection, and 5uA reverse current. So it's quite capable of handling the job.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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#20
(06-03-2017, 10:52 PM)Korishan Wrote: Schottky Diodes can have many Vf ranges. However, for our application, you can them as low as 600mV

http://www.mouser.com/ProductDetail/Vish...AmraaXE%3d

Quote:Product: Schottky Diodes
Mounting Style: Through Hole
Package / Case: DO-35
If - Forward Current: -
Vrrm - Repetitive Reverse Voltage: 20 V
Vf - Forward Voltage: 600 mV
Ifsm - Forward Surge Current: 15 A
Configuration: Single
Technology: Si
Ir - Reverse Current: 5 uA
Maximum Operating Temperature: + 125 C
Brand: Vishay Semiconductors
Height: 1.7 mm
Length: 3.9 mm
Operating Temperature Range: + 125 C
Pd - Power Dissipation: 400 mW
Termination Style: Through Hole
trr - Reverse Recovery time: 10 ns
Type: Small Signal Schottky Diode
Vr - Reverse Voltage: 
20 V

So, as you can see, a Schotty could be used in our application. That diode also has a 20V reverse protection, and 5uA reverse current. So it's quite capable of handling the job.
Like I said .6V (600MV) won't work on the output side of a tp4056.  
If you hook it in series with the 18650, and your tp4056 is outputing 4.2 volt, the 18650 is only going to see 3.6V.  The tp4056 will stop charging long before the 18650 is charged.

Ok, ok, I think I found a website that provides an answer.

A 6 amp capable Schotkey diode across the output terminals of the tp4056.
And then put a ptc self resetting fuse in series with the battery.

So the resistance is very low on the ptc I selected. It's 0.07 ohms. So only .07 volts drop at 1 amp, but only .007 volts drop at 100 mAmps. I think it will do the trick.

https://electronics.stackexchange.com/qu...when-prote

http://www.mouser.com/Search/m_ProductDe...fH9w%3D%3D
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