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Half-Bridge inverter using UCC27200

Jacek Milbrandt
Prodigy 20 points
Other Parts Discussed in Thread: UCC27200

Anyone who can help me,

Half-Bridge inverter using TI’s ECC27200 as MOSFET driver. On the page 19 of this IC Datasheet there is the diagram of such inverter. I’ve build one, but it did not worked for me. I could not get the output shape even close to sin wave on the transformer primary side. My questions are:

1.       What input I am supposed to supply on J13? Neither pulses signal nor PWM signal gives me sin wave across the primary of the output transformer

2.       On the schematic of this inverter there is many test points (TPs) and jumpers (JPs) so TI may have such a board already build that works. If yes, can I have it as a demo or sample for a while to test it?

 

Jacek

 

  • 0
    TI__Mastermind 25130 points

    I am assuming that you ar refering to UCC27200 not ECC27200.

    The schematic on page 19 of the specifiction is of a Half Bridge Converter using the UCC27200 in a high side - Low side driver configuration. You do not want to get sinusoidal waveforms in a standard half bridge converter. You want the switches either hard on or hard off to minimize losses. If you look at the time bases for the waveforms on page 17 and 18  (figures 26 to 29) you can see that these are the edges of the pulses.

    J13 is a clip for  a scope probe to limit the noise pickup.

    You would have to contact the local TI represenative to see about any engineering evaluation models.

    John

     

  • 0 in reply to John Bottrill
    Prodigy 20 points

    Hi John,

    Thanks for your answer. Of course it was supposed to be UCC27200

    I think I did not explained my problem correctly. What I want to make is: Drive the small induction motor, some 1.5A as a load, during students experiment.  Switching losses and/or noice are not my biggest concern at this time. J13 is the "CLK" input for SN7474 (U5:1) and also input for the AND gates of SN7408 (U4:A,B) so some kind of input signal have to be supplied to make this circuit working as expected. I agree that it is difficult to get the perfect sin wave on the load terminals with only pulses on the input, but I've thought that supplying PWM on J13 I will get AC wave resembling sin shape. Also the capacitors C1,2 10,11, 39, 40 have to be bigger, low pass filter implemented etc, etc. I think it is make-able.

    Could I have a contact info of the local TI rep located in Philadelphia area?

    Regards,

     

    Jacek