Author Topic: Help Lithium ion battery protection IC not able to drive MOSFET  (Read 1491 times)

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Offline oppelTopic starter

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Help Lithium ion battery protection IC not able to drive MOSFET
« on: December 13, 2023, 06:58:01 am »
I wanted to make a laser distance meter project that works with a Li-ion battery.
In order to keep the voltage of the Li-ion battery at a certain level, I used an integrated circuit (AP9101CK6-AYTRG1) that protects the Li-ion battery in my circuit. Unfortunately, the circuit I created with this integrated circuit does not work.

The circuit in the integrated datasheet is the image Figure 1, but when doing research on the integrated
When I researched drawn circuits, the circuit I created is as shown in the image Figure 2.
 
I confirmed with both a multimeter and an oscilloscope that there was no voltage coming to the MOSFETs. Why do you think the Mosfets do not turn on? Where might I have made a mistake in the connection or how can I make this integrated work? Can anyone who has used this integrated device or has experience help me?
« Last Edit: December 13, 2023, 07:07:46 am by oppel »
 

Offline SeanB

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Re: Help Lithium ion battery protection IC not able to drive MOSFET
« Reply #1 on: December 13, 2023, 07:17:17 am »
Have you tried to charge the lithium cell, the protection IC will power on, when battery is connected, in the off state, as a shipping mode, and will only enable itself when it sees an attempt is made to charge the cell, and will then turn on both mosfets.
 
The following users thanked this post: Dan123456, oppel

Offline Dan123456

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Re: Help Lithium ion battery protection IC not able to drive MOSFET
« Reply #2 on: December 13, 2023, 09:40:19 am »
I’ve had a similar issue with eBay 2S protection modules.

Connected the batteries and… nothing!

Thought they might have been duds / a scam but found out I just had to feed them charging voltage for like a second before disconnecting and then they operated perfectly  :)

Hopefully it is just that  :)

Edit: p.s. welcome to the forum  :)
 

Offline jdev99

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Re: Help Lithium ion battery protection IC not able to drive MOSFET
« Reply #3 on: January 31, 2024, 12:59:35 pm »
You need to "start" the circuit 1st, as per the datasheet.

"For power-down mode, when first connecting AP9101C system board to the battery, it is necessary to use charger or to short P- to the battery negative
polarity. Once the AP9101C is activated, the charger or connection can be removed, otherwise the battery cannot discharge current through the system
board. The values selected should follow the recommended typical range mentioned above."
 

Offline jdev99

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Re: Help Lithium ion battery protection IC not able to drive MOSFET
« Reply #4 on: January 31, 2024, 01:02:14 pm »
I’ve had a similar issue with eBay 2S protection modules.

Connected the batteries and… nothing!

Thought they might have been duds / a scam but found out I just had to feed them charging voltage for like a second before disconnecting and then they operated perfectly  :)

Hopefully it is just that  :)

Edit: p.s. welcome to the forum  :)

For the HY2120 IC's they say in the datasheet: "Discharging may not be enacted when the battery is first time connected. To regain
normal status, CS and VSS PIN must be shorted or the charger must be connected"

https://www.hycontek.com/wp-content/uploads/DS-HY2120_EN.pdf

I just fitted a small pushbutton to my board to "start" it.
 


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