TL494: BMS 48V ACTIVE CURRENT LIMIT 10A

Huynh Tan Hung

Part Number: TL494

Tool/software:

I want to design a charging circuit that stabilizes the current limit at 10A for CHARGING a 48V BMS using the TL494. The input voltage is 53-54V. I see that BMS from China usually include this circuit but they use LOW SIDE mosfet, but I want a HIGH SIDE MOSFET. Could I get a reference design for this? Thank you.

over 1 year ago

0 Hong Huang over 1 year ago

TI__Guru 74115 points

Hi,

I am not sure what you are referring. Please show a circuit and show what changes you want to have. So we can understand if there are reference designs or we can suggest what can be done.

0 Huynh Tan Hung over 1 year ago in reply to Hong Huang

Prodigy 10 points

This is my schematic ,use buck converter to reduce voltage, lower charge voltage make battery eat lower current. Output voltage will drop when supply voltage for charging, so it can charge, the feedback have problem or mosfet trigger do not work. The maximum frequency about 95%, i want it can up to 98-99%.

0 Huynh Tan Hung over 1 year ago in reply to Huynh Tan Hung

Prodigy 10 points

https://drive.google.com/file/d/10OIHZXMN4ICfXU1iRR6stIpgH-cacail/view?usp=sharing

0 Huynh Tan Hung over 1 year ago in reply to Huynh Tan Hung

Prodigy 10 points

my circuit works in current mode, if the current load higher than current voltage ref, the pwm will reduce to reduce voltage, also reduce current to load, could you suggest any reference design about current mode buck converter for battery current limit charge

0 Hong Huang over 1 year ago in reply to Huynh Tan Hung

TI__Guru 74115 points

Hi,

I cannot open this below link. What do you want to share with me?

https://drive.google.com/file/d/10OIHZXMN4ICfXU1iRR6stIpgH-cacail/view?usp=sharing

You can search below link on ti.com to pick up a buck controller with current mode control.

AC/DC & DC/DC controllers (external FET) product selection | TI.com

Power management

Power management forum

TL494: BMS 48V ACTIVE CURRENT LIMIT 10A