UCD3138: Evaluate and recommend appropriate options

Hi  Friends:

Customer  received a 1000 W special charger from the end customer, the battery voltage from 28 V to 115 V, can be charged;

I have the following design ideas and would like to consult you:

Scheme 1: in the two-stage scheme, boost-pfc is used to increase the BUS to about 400 V, and then a phase shift full bridge is added to realize the output voltage from 28 V to 115 V

Disadvantages, duty cycle loss, wide voltage regulation, efficiency may not be high;Advantages low cost;Simple circuit;

Scheme 2: the two-stage scheme USES boost-pfc to increase the BUS to about 400 V, and USES double-tube flyback to realize the output voltage from 28 V to 115 V

Disadvantages: the lowest efficiency, the difficulty of EMI rectification and the lowest advantages and costs;Suitable for wide voltage regulation, simple circuit;

Scheme 3: in the three-stage scheme, boost-pfc is used to increase the BUS to about 400 V, and then one BUCK is added to adjust the voltage from 30 V to 120 V

Third stage fixed frequency LLC, only complete isolation, the first stage turn ratio 1:1

Disadvantages, complex circuit, the highest cost, advantages;The most efficient

Please evaluate the above three plans. Which one is the best?

Do you have a better plan?

Can you use the data power plan, for example: UCD3138;