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  1. #1
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    Three Phase BLDC motor H Bridge Circuit using mosfets

    Hello Everyone,
    Hi,I am new to website and new to this subject aswell,so if my quetions ar silly please bare with me.

    I am trying to build Three phase H bridge,using 6 mosfets to commutate Three phase Bldc motor.Voltage supply for this motor is 15v-60v DC and i am using Atmeg8 microcontroller to control it.

    My questions are related to H-bridge:

    1) How do i choose MOSFETs?

    i have build a H bridge using 3 p-mos (High) and 3 n-mos(mlow) using driven by four switching inverters made by transistors.

    2)IF i build another h bridge with all n-mos will it giv me same results?

    3)i have also consider using L6385 driver,would that make any diffrent?( by the way i havent figured out how to use it tho)

    4)when it comes to H-bridge and drivers,how to decide which one is better refer to cost,efficiency and avaibillity?

    •   Alt15th September 2010, 02:30

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  2. #2
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    Re: Three Phase BLDC motor H Bridge Circuit using mosfets

    Hi

    1. You can select MOSFETs according to the voltage & current ratings, Also consider the Rds(ON) .. use least RDS(on) MOSFET so that heating will be less.

    2. You can use N channel mosfets at High side , but to drive high side gate you have to use boot-strapping or separate isolated power supply . It will work the same way as with p&n channel mosfet H bridge

    3. IR2110 ( from International rectifier irf.com) are good, M57962L based drivers are also works fine



    •   Alt16th September 2010, 05:14

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  3. #3
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    Re: Three Phase BLDC motor H Bridge Circuit using mosfets

    hello
    I used 3 for a L6384 for a motor 50,000 rpm at 60V
    L6384 are stmicroelectronics
    Last edited by gianmagna; 16th September 2010 at 11:53.


    1 members found this post helpful.

    •   Alt16th September 2010, 11:18

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  4. #4
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    Re: Three Phase BLDC motor H Bridge Circuit using mosfets

    How to control it.
    Thank you



  5. #5
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    Re: Three Phase BLDC motor H Bridge Circuit using mosfets

    hi...i was looking thru an application note by ON semiconductors on control of 3 phase BLDC motors using MC33035....
    my queries:
    1. the circuit uses both p channel n n channel;any specific reason? can we use n channel for both? how would that change the circuit design?

    2. can we use the circuit to control 5V motors by putting some buffer in between? if so, how would i alter the design?



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