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Switched mode power supplies for home appliance

Other Parts Discussed in Thread: UCC28710, LM5023, UCC28630, UCC28180, UCC28050, UCC3818, UCC28070, UCC28063, UCC28051

Hello,

I'm a PhD student and i would like some information from you. I work on the susceptibility of power supplies of electronic equipments at home (TV, internet box, notebook, mobile phone, computer ...). (AC/DC)

I made some researches and I found it existes differents topologies. Nowadays, I think switched mode power supplies are the most used and it existes "flyback", "forward", "half-bridge" and "full bridge" power supplies and theirs versions resonant or quasi-resonant. I also found "flyback" power supplies are used under 100W, "forward" between 100 and 300W, "half-bridge" between 300W and 1500/200W and "full-bridge" above theses powers. I think linear power supplies are less used today.

For confirm these boundaries, I collected datasheet about power supplies evaluation board on the Internet.  Finally, I can conclu that power supplies are type of "flyback" or "quasi-resonant flyback" between 0 and 70W and "half-bridge resonant LLC" between 90 and 500W. Therefore, boundaries that I found before are not correct.

I contact you to have your feedback about my researches whose I told you before. Does a conclusion may be extracted to know what type of power supply is used according to the power ? Moreover, have you got some information about this subject which could be interesting for my bibliographic part ? Have you got some topolgies which could be representative of the most of power supplies in home appliance ?

For all explain to you, I am at the beginning of my thesis and I try to find which kinds of power supplies are used at home and which kinds of topologies are used. The goal is to select two or three topologies which could be representative of power supplies which we could find at home in order to make experiments on them.

 

Thank you in advance for your answer which will be very important for me and sorry for my English, which can sometimes be rough.

Guillaume

  • Hi Guillaume,

    Below 75 watts of input power the flyback is the most popular choice of topology. In consumer appliances once the input power exceeds 75W the power supply must have PFC which makes the design a two stage consisting of PFC + Flyback popular up to 150W or PFC + LLC for 150W to 1kW.

    For Flyback controllers in TI, the UCC28710 is a valley switching controller with primary side regulation (PSR). The LM5023 is a QR controller with opto-coupler feedback. The UCC28630 is interesting in that it is a PSR controller but it can operate in CCM and extend the power capability by 100% for a small increase in the transformer size.

    There are a lot of useful training materials available form TI, www.ti.com/.../login.shtml

    By the way your english is also very good :)

    Regards

    Peter
  • Thank you very much for you interesting answer. If I well understand, flyback up to 75W and flyback (75W to 150W) or LLC (150W to 1kW) + PFC above this power.

    About the PFC, I can see it exists passive and active PFC, what is the difference and in which case do we use more one than the other ?

    Thank you again and have a good day,

    Guillaume MEJECAZE
  • Hi Guillaume,

    Passive PFC uses a physically large inductor to help spread the input current across a large area of the ac line cycle.


    Active PFC involves place a boost stage after the bridge rectifier and controlling  the boost stage to draw current of the majority of the ac line cycle. Type PFC controllers ate the UCC3818, UCC28050 and UCC28180.

    You will find plenty of information on active PFC at www.ti.com/.../login.shtml:1230:0]

    Regards

    Peter

  • Thank you again for your answer.

    And the use of the passive or the active PFC depends of the power of the supply ?

    Thank you very much for your very interesting answers for me.

    Guillaume
  • Hi

    Passive PFC is used were physical size of the power supply is not an issue or weight is not a concern, not popular these days. Active PFC is used to shrink the size of the design and reduce weight. Active PFC also has better performance in terms of higher power factor and lower harmonics.

    Regards

    Peter
  • Hi,

    Thank you again for your answer. All these informations are very important for me.

    I have another question. You gave me some references of controler used in power supplies such as UCC28710, UCC28630 and LM5023. However, I collected 16 datasheet of TI power supplies evaluation board and I found only one EVB with UCC28630 and one with LM5023. They have all a different controler.
    Do these references are the most used in home appliance ? and does it signifies that evaluation boards are not similar than power supplies in home appliance ?

    Sorry for my questions they are maybe a little boring,
    And thank you again

    Guillaume
  • Hi,

    Below 75W the flyback topology is the most common if not only topology used for isolated ac/dc conversion. There are many different types of controllers than can implement a flyback circuit with different control algorithms, PSR, QR, Opto-feedback etc.

    The EVMs are used to demonstrate the capability of the controllers are usually close to designs that would be useful to customers.

    Regards

    Peter
  • Thank you again for your answer.


    Can I conlue that EVBs are very closely than products you could sell to yours customers?

    Thank you again, all your answers are very rewarding for me.

    Guillaume MEJECAZE

  • Yes, there are usually close to what customers would use but not as high density in terms of component placement.

  • Thank you very much for all your answers. They are very important for me and I can see a little bit more clear now. I have all my answers for the moment.

    Thank you again and have a nice day,

    Guillaume
  • I come again to you because I have another question. I would like to know what is your share of the market of the controller. I try to know which constructors have the most important market share in terms of power supplies and especially in terms of controllers.

    Thank you again for your patience,

    Guillaume
  • Hi Guillaume,

    I am sorry TI will not share that type of information. You may be able to find some estimates on-line provided by third party organistations.

    Regards

    Peter
  • Hi,

    Thank you for your answer. Is it possible to know which controller and PFC sell you the most ? Which components sell you the most for AC/DC power supplies for home appliance ? In order to know reprensatative models of controllers and components in SMPS for home appliance.

    Thank you again,

    Guillaume
  • Hi Guillaume,

    Since home applicance is usually lower power the UCC28050 or UCC28051 transition mode device is popular. If the definition of home appliance includes digital TV then the UCC28063 and UCC28070 dual channle interleaved controllers are popular as they can enable low profile PFC stage design.

    Regards

    Peter
  • Thank you for your fast answer. These references are for PFC controllers.
    But for SMPS controllers ? Like Flyback controllers ?

    Thank you another time,

    Guillaume MEJECAZE