• State
  • Locked Locked
  • Replies 9 replies
  • Subscribers 81 subscribers
  • Views 638 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Hardware Requirements for TMDSSOLARUINVKIT (Questions about Required Equipment)

Mangal Prakash
Prodigy 165 points

Hi,

I have purchased TMDSSOLARUINVKIT recently and the hardware equipment required to run the solar micro inverter kit as mentioned in Control Suite CCS User Documentation are:

1) Input power source- Isolated DC Power Supply rated 25-44VDC, 20A and 400W min (Agilent Programmable DC Source, model N5769A or similar).
2. 200 Ohms, 500W power resistor
3. 100 Ohms, 1KW power resistor
4. 1K Ohms 500W power resistor
5. Volt-Meters of up to 500V input range
6. Oscilloscope of ~200MHz bandwidth.
7. High Volt Differential Probe, Tektronix P5205 or similar.
8. Current Probe, Tektronix TCP202 or similar
9. Current Meter for output AC current, Up to 5A (RMS) range
10. Current Meter for input DC current, Up to 12A (DC) range

From what i understand, I have some questions about these hardware equipments.
1) The resistors (200 Ohms, 500W power resistor/100 Ohms, 1KW power resistor/ 1K Ohms 500W power resistor) are meant to be used as load. So why is it necessary to use 3 resistors? Can any one of these alone not be used?
2) Also, what is the requirement for using 200 MHz bandwidth oscilloscope? I am expecting power signals to have a frequency of a few kHz during transients phase. So why do we need to have such high bandwidth oscilloscope?

3) What is the necessity for a Programmable DC source?  Can a standard DC source (not programmable) not meet the operational requirements?

Apart from this, the jumper and basic board setup documentation says " Verify a jumper cable is connected between TP8 and TP9 to connect the DC-DC stage output to the DC-AC stage input. If not install this jumper cable using a #16 cable."

What is a "#16 cable"? I do not seem to find it anywhere. 

Thanks,

  • 0
    Guru 192875 points

    Hi Mangal,

    Mangal Prakash said:
    1) The resistors (200 Ohms, 500W power resistor/100 Ohms, 1KW power resistor/ 1K Ohms 500W power resistor) are meant to be used as load. So why is it necessary to use 3 resistors? Can any one of these alone not be used?

    I've personally not used this kit and the setup but combinations of the above resistors can be used as load or individually too this should be possible.

    Mangal Prakash said:
    2) Also, what is the requirement for using 200 MHz bandwidth oscilloscope? I am expecting power signals to have a frequency of a few kHz during transients phase. So why do we need to have such high bandwidth oscilloscope?

    This might be to check the ringing effect while switching. But yes, 100Mhz should be sufficient.

    Mangal Prakash said:
    3) What is the necessity for a Programmable DC source?  Can a standard DC source (not programmable) not meet the operational requirements?

    You can use a simple variable DC source where you'll be able to control voltage and current limits.

    Mangal Prakash said:
    Apart from this, the jumper and basic board setup documentation says " Verify a jumper cable is connected between TP8 and TP9 to connect the DC-DC stage output to the DC-AC stage input. If not install this jumper cable using a #16 cable."

    This means #16 AWG - Gauge Spec.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Prodigy 165 points
    Thanks Gautam. However, can you please shed some light on the requirement of oscilloscope in MHz range? I was expecting a few kHz range for the transients. Do we expect to see such high frequency signals in power lines?

    Thanks,
  • 0 in reply to Mangal Prakash
    Guru 192875 points
    However, can you please shed some light on the requirement of oscilloscope in MHz range? I was expecting a few kHz range for the transients. Do we expect to see such high frequency signals in power lines?

    Depends on what you need to study. I personally use a 100MHz oscilloscope which seems to be more than sufficient for my study of waveforms.

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Prodigy 165 points

    Agreed, but I needed some technical details into it. I just don't want to buy something which is a little too much for my needs, as it is expensive, I have a 2 MHz oscilloscope already. As of the specifications, this kit supports panel voltages of 28 to 45V at input as well as universal power output at up to 280W for 220VAC and up to 140W for 110VAC, Can you please suggest if my oscilloscope will be a good fit?

    Thanks,

  • 0 in reply to Mangal Prakash
    Guru 192875 points
    I have a 2 MHz oscilloscope already

    If you already have one, then why do you want to buy another! Check with the existing one if you feel the scope is limited, only then go for a better one. Also, you'll be able to judge immediately what would satisfy your need once you work with the existing one. I won't suggest the exact config because that would be unfair as every individual has his own requirements and should choose accordingly.

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Prodigy 165 points
    Hi Gautam,

    Can you please suggest if multiple DC sources can be used to power the board simultaneously? I mean if I can use, say 2 DC sources connected to the same input terminals and both of them source in different power to the board? It is not mentioned anywhere on the docs available for the kit.

    Thanks,
    Mangal
  • 0 in reply to Mangal Prakash
    Guru 192875 points
    Hi Mangal,

    You should be able to use them but please study the schematics whether the same is acceptable with isolated Grounds or common grounds.

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Prodigy 165 points

    Hi Gautam,

    On the programming side of things, I have a question (I posted this question in forum but got no replies, so re-posting it to you.)

    I have seen the sample projects of C2000 Solar Micro Inverter Kit (TMDSSOLARUINVKIT) which uses Piccolo and F28035ISO control card. I have not done programming of any sort for any other MCU before. But I know the basics of C++ and have learnt somewhat about 8085 microprocessor. However, going through the sample projects of C2000 Solar Micro Inverter Kit (TMDSSOLARUINVKIT), I could not figure out what the instructions meant exactly. Since I need to start writing my own projects I will need to write new programs. I am using CCS v 6.0

    Can you please suggest how to learn writing programs in this device and where can I get what each instruction used in the sample projects mean? Also, which programming language has been used for these sample projects?

    Thanks,

    Mangal

  • 0 in reply to Mangal Prakash
    Guru 192875 points
    Mangal, I've replied here: e2e.ti.com/.../1538475

    Close this thread and continue there.

    Regards,
    Gautam