IR 2101 FET DRIVER problems.. (a Full bridge inverter project)

Discussion in 'The Projects Forum' started by Engproject09, May 12, 2009.

could it be a problem with the fets ? (NEW)

  1. yes

    1 vote(s)
    20.0%
  2. No

    4 vote(s)
    80.0%
  1. Engproject09

    Thread Starter New Member

    May 11, 2009
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    0
    Hey guys attatched is the test schematic from IR and some notes of the problems i am having with the IR2101..

    I need some help in getting it to work. I cant even get the test circuit to work.

    can someone explain how i need to calculate the proper capacitance and diode values it would be ace too.. But most importantly a proceedure and circuit would be much appreciated. I have another little DC motor that i have been using as the load to test this. I am also sending the pulse to the HIN and LIN from a micro, or function generator.

    the IR2101's are intended to be used in a full bridge inverter to cotnrol a BLDC, pulsed from a PIC micro controller.

    cheers:
     
  2. Engproject09

    Thread Starter New Member

    May 11, 2009
    4
    0
    problems that i am havving are detailed on the picture/schematic provided
    cheers
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
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  4. Engproject09

    Thread Starter New Member

    May 11, 2009
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  5. Engproject09

    Thread Starter New Member

    May 11, 2009
    4
    0
    is there anyone that has use these drivers before and has a proper test circuit ?
     
  6. Tahmid

    Active Member

    Jul 2, 2008
    344
    25
    Hi,
    The HIN is the input signal for turning on the high-side MOSFET and LIN is the one for the low-side MOSFET. Use larger capacitors than 0.04uf and use the same value capacitance in between vcc and gnd.
    The capacitors are there to create an isolated gate drive signal for the high side MOSFET. The driver creates a "virtual ground" using the capacitor thus creating an isolated voltage from gate to source of the high side MOSFET.
    For the diodes, use ultrafast types (I use BYV26E).
    The circuit given in the datasheet is fine. All you need to do is create an oscillator with symmetrical complementary outputs (eg. 4047, SG3525, 3524, 3526, Tl494, etc) and connect the output signals(Q and Q inverse) to the HIN and LIN pins.
    Hope this helps.
    Good luck.
     
  7. Tahmid

    Active Member

    Jul 2, 2008
    344
    25
    I will try to provide a test circuit for you. But give me some time.
     
  8. engstudent08

    New Member

    Oct 21, 2008
    5
    0
    Thanks very much for your help

    I still cant get them working though..

    any chance of a simple test circuit just so i can observe the HO and LO outputs!!
    cheers
    and thanks again
     
  9. Tahmid

    Active Member

    Jul 2, 2008
    344
    25
    Hi,
    Here is a test circuit:

    [​IMG]

    Apply power to where is marked 12v and gnd. And connect oscilloscope probes to test point hi and test point lo.
    Hope I could help.
     
  10. engstudent08

    New Member

    Oct 21, 2008
    5
    0
    Thanks very much mate!

    Finally i have again setup the circuit provided on the IR2101 data sheet! and with all the capacitors and correct diode the circuit is now stable!
    Hence i have connected 36 volts to the rail and power the chip with 12 Vcc. and for once the chip isnt overheating or blowing.

    Now i have connected the outputs to a resistor. Hence i am thinking that when i PWM the hin and lin i should be able to see voltage at the resistor right ?

    Your said i needed an oscillator... can i just use a Function generator ? or can i trigger the LIN and HIN with just 5 volts from another power suply ? or will this cause problems ? can i just tie the LIN to ground and pulse the HIN ?

    whats the best way to observe these fets switching

    thankyour so much for your continued help
     
  11. shashankparab

    New Member

    May 1, 2009
    1
    0
    hey can you post the updated diag. here?
     
  12. cabir

    New Member

    Oct 14, 2008
    1
    0
    Hi Tahmid
    Could you post the updated diag again please or to my own email?
    Thanks
     
  13. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,791
    1,103
    Cabir, that thread is over 5 years old!. I doubt Tahmid is checking it.
     
  14. shortbus

    AAC Fanatic!

    Sep 30, 2009
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