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UCC256304: LLC topology for battery charger application

TISL
Expert 4640 points
Part Number: UCC256304
Other Parts Discussed in Thread: UCC256404

Dear e2e support,

My customer reports the following thoughts about  LLC topology, to be used in battery charger applications:

-        battery chargers require to handle wide output voltage ranges. It is not recommended with LLC

-        load transients from no load to full load are difficult to stabilize with LLC

-        battery charger output AC ripple voltage with LLC affect batteries lifetime

All these drawbacks are true only on DFC (or VFC) or is it true also in HHC (as UCC256404)?

Do you confirm?

Regards,

  • 0
    TI__Mastermind 27145 points

    Hi TISL,

    1. Yes, it is true that battery charger needs to handle wide output voltage. Whether LLC can be used depends on the output voltage range and efficiency needed but LLC has been used for battery chargers before. Here is a reference design example for LLC battery charger:http://www.ti.com/tool/TIDA-00355

    2. HHC has much better transient response than a traditional DFC control scheme. This should not be a problem for UCC25604. I would say most battery charger designs I have seen do not need fast transient response since it is charging a battery.

    3. Yes, it is true that AC ripple will affect the battery lifetime. I would say HHC does have inherent feedforward in its HHC control scheme as the input current is incorporated into the control loop by looking at the resonant capacitor voltage so HHC would be better equipped to reject AC ripple.

    Best Regards,

    Ben Lough