• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 63 subscribers
  • Views 682 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

High power source, 0-100V, 6Amps or more

Petr Machala
Prodigy 50 points
Other Parts Discussed in Thread: UCC28180, UCC28950

Hello,

I am contacting you regarding a specific power supply design. I have quite strict and high requirements for the power source meaning that it must be adjustable from 0 to approx. 100V with output current about 6 Amps or more. I would like to know what is in the TI AC/DC portfolio to make this power source possible. The max. value of the output current is usually for only a 10-20sec or so and than the power source rests. I have some idea how to make it as a linear power source with multiple winding transformer (reconnected by the MCU according to set up output voltage) and an output amplifier but this solution is quite big and expensive.

Thank you very much for your reply.

  • 0
    TI__Mastermind 31580 points
    Hi Petr,

    At 600W many of the power supply designs use two stages, a PFC stage and a dc/dc isolation stage. For 600W I recommend the UCC28180 PFC controller and for the DC/DC stage I think you should look at a full bridge stage, maybe the UCC28950 would be of interest.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    Prodigy 50 points

    Thank you very much for your reply.

    Best regards

    Petr

  • 0 in reply to Peter Meaney
    Prodigy 50 points

    Hi,

    Again thanks for your reply. I really like your solution but I am quite skeptical about the regulation properties of the power source. Do you think it is possible to design the power source for the voltage range mentioned in the title of the topic (0-100V)?

    Its really important to the project that the voltage could be changed/increased quickly during the operation without any instability, ripples, power cuts etc.

    Thank you very much for your reply...

    Best regards

    Petr

  • 0 in reply to Petr Machala
    TI__Mastermind 31580 points

    Hi Petr,

    Nearly all the applications we seen are for fixed output voltage designs. The phase shifted full bridge should be able to drop the duty cycle to near 0%. 

    If efficiency/power dissipation is not a major issue prehaps you could use a post regulation buck stage to modulate the output voltage. What rate of change of output voltage does your system require?

    Regards

    Peter

  • 0 in reply to Peter Meaney
    Prodigy 50 points

    Hi Peter,

    The efficiency is not really an issue the real operation is what matters. The operation should be quite simple. It works in two modes...

    First one is automatic where the worst case scenario is the mentioned voltage ramp from 0V to 100V with max. current approx. 6Amps (hopefully this is a maximum because I heard that even more would be better). This process is fairly quick meaning 10-20 sec. Then the process stops and there is some time to rest.

    The second mode is manual where it should be possible to choose (by user) voltage from 0V to approx. 24V and the current could be theoretically the same (6 Amps) and continuous for a long time.

    So you think that the AC/DC converter should be fixed to for example 100V and then I should decrease it by BUCK converter? This could work for the first mode but I am afraid that the second mode would fried the BUCK converter.

    Thank you very much for your reply. I am at the beginning of this project but there are a lot of ways how to do it so I want to choose the right one from the start and then just fix the bugs.

    Best regards

    Petr