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Non-inverting type 2 and 3 compensators

kirous bachi
Intellectual 260 points
Other Parts Discussed in Thread: LM5118

Hi

I am familiar with inverting Type 2 and 3 compensators, I have stabilized many DC/DC converters (buck boost ...) with these types. I could derive and manipulate (Poles and Zeros) the transfer function of these compensators. These last days, I am faced with "Non-inverting type 2 and 3 compensators". The topology i found in some sites did nont convince me.

Please can anyone guide me to PDF file that deals in depth with this kind of compensators ?? 

  • 0
    TI__Mastermind 21720 points

    Hi Kirous,

    Thanks for reaching out with your questions.

    Can you explain what you mean by non-inverting type 2 and type 3 compensation? To achieve a stable control loop negative feedback is required.

    Thanks,

    Garrett

  • 0 in reply to Garrett Roecker
    Intellectual 260 points

    Hi

    Thanks for your reply. 

    Let's take example of a bidirectional power supply (Buck-boost), used as follows:

    *As a battery charging system and the topology is a buck converter

    *As a boost converter that boosts  up the battery voltage for  some network.

    The whole circuit can take a topology where the output voltage of the boost converter may be negative (Well known in buck-Boost topology).

    to compare the output voltage to the reference voltage that is positive, we need to converte the output voltage of the boost configuration and compare it to the reference of the error amplifer that is usually connected to the non-inverting input.

    Now, imagine we take the output voltage and connect it directly to the non-inverting input of the error amplifier and try to design a compensator through this configuration??

    In this case we talk about a non-inverting compensator, After a while I will provide you with a PDF that deals with this kind of compensation (The only doc I have found) and it will be a pleasur for me to discuss it with any one, as it is a new concept for me.

  • 0 in reply to kirous bachi
    Intellectual 260 points

    Here I attached an image of the application which deals with this kind of compensator

  • 0 in reply to kirous bachi
    TI__Mastermind 21720 points

    Hi Kirous,

    I think the easier solution is to design a non-inverting buck-boost converter like the LM5118. This reduces the need on keeping all the necessary inversion straight.

    For inverting buck-boost I suggest that you take a look at this application note.

    Thanks,

    Garrett