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  • TI Thinks Resolved

UC3637: Does it possible to apply in PT and CT

Intellectual 650 points

Replies: 5

Views: 179

Part Number: UC3637

Hello Sir,

My intention is to make an 3-phase power calibrator, https://us.flukecal.com/products/ele...wer-calibrator

For more idea, take a look here, 

I was looking for a ClassD solution, https://e2e.ti.com/support/audio/f/6/t/842164

Many people says " potential transformer PT can be applicable with TPA3220(analog input), or TAS5760M or TPA3116D2". Mostly they are , Speaker Bar, Docks or Consumer Audio Application.

My case is different. 

My requirements were,

REQUIRMENTS :
1. The amp input should be plus and minus 7volt AC, 45-65Hz( 1 Hz has been converted to 1024)
2. Amp operating voltage should be more or less 24v.
3. 2 channel signal (not sure PWM) should be use , one for current, one for voltage.
4.Can run current transformer(input 16.5 V/1.5 A) and potential Transformer (input15v/2A). PT output may be 15VAC.
5. If possible both voltage and current amplification is required in one IC.
6. Both positive and negative half signal should be amplify. ( take a look bellow For CT, current transformer primary winding has 80turns, 16.5 V/1.5 A, secondary has 20Turns, 4.125v/6A output! For PT, Potential transformer, Primary has 80turns, 15v/2A rating input, secondary has centertap! At secondary 960turns, 360v/0.332 A and 960turns 180v/0.166A output.

I wanna move to Bridge type/SMPS type application, since it looks little bit high current and voltage application.

Dont you think UC3637 can be applicable in this case?

Most probably the challenge is to control facilities, since my system has instruction from central stm32!

HW Engineer

Hasan

  • Hi Hasan,

    Have you considered the DRV8412 and DRV8432? These devices have been used in similar applications, such as TEC drivers to create positive and negative voltages.

    Please refer to Figure 17 of the datasheet for an example.

    Best Regards,
    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    Hi Rick,

    Nice to get your feedback.

    Yes, it might be similar. Not sure how "Motor" can be replaced by CT or PT in 60Hz range. Previous one UC3637 is kind of backdated!

    I have not read it in detail, looks like it can be controle with STM32 since it accepts PWM.

    Keep in mind, my origial signal from a STM32 board MUST be amplify from 7volt AC, 45-65Hz to 16.5 V/1.5 A in case of current transformer.

    An amplifier is absent!

    Question will be 

    1. Does it contain enough facilities for dealing with high current?

    2. It has current limiting and high temperature shut-down?

    3. Can it be also run with an AMP?

     

    HW Engineer

    Hasan

  • In reply to MD MUBDIUL HASAN:

    Hi Hasan,

    The DRV8412 and DRV8432 are H-bridges, and are similar to the L298 shown in the UC3637 datasheet.

    The STM32 board should be able to control the DRV8412 without needing the UC3637.

    1. Does it contain enough facilities for dealing with high current?

    Yes, the DRV8412 can provide up to 6A continuous and the DRV8432 can provide up to 14A continuous current.

    2. It has current limiting and high temperature shut-down?

    Yes, both have current limiting, high temperature warning and high temperature shutdown.

    3. Can it be also run with an AMP?

    The both are amplifiers.

    Best Regards,
    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    Hi Mr Rick,

    Thank you once again.

    Your feedback is reasonable, but from my part I need to study for  full  understanding.

    I think I did see this IC before you suggest me.

    Well looking at your recomendation, my mind wants more to make sure things workable or not.

    Its a motor driver, but similar to this anything can accept "pre amplifier circuit"?

    I mean, I want to use a classD before DRV8412.

    If its not suitable, then other motor drive need to be select.

    HW Engineer

    Hasan

  • In reply to MD MUBDIUL HASAN:

    Hi Hasan,

    If you have further questions, please let us know.

    For now, we will mark this as "TI thinks resolved".

    Best Regards,
    Rick Duncan
    Motor Applications Team

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