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Recent content by ionp

  1. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    Thank you for your suggestion. Yes, coming from a communications background into induction heating has turned a number of concepts on their head! I would use a solenoid if I needed to increase the L, but I can get the same cancellation with a bifilar layout and running a linear path up and...
  2. I

    90 Degrees Shift of Digital Signal

    You are correct about calculating the reactive power. I have not done a Hilbert transform myself, so perhaps someone else can help you with its implementation. You can also get magnitude and phase info as a starting point with an FFT at numerous frequencies with spacing dependent on your...
  3. I

    90 Degrees Shift of Digital Signal

    Not really my area, but a hilbert transform on a periodically sampled signal should help getting a 90 degree component. But if I was going after real and reactive power, I would: Real power- Multiply samples of V and I taken as close as possible to the same sample time, then put the result...
  4. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    Going straight up and back (nearly bifilar) seems to always be lower Q than a coil or ring, and with various diameters and types of steel or copper has never resulted in a Q less than 1.
  5. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    Thank you for your suggestion. The problem is that even non-inductive resistors tend to have as much inductance as a piece of wire, and by the time you have enough strung together to handle 100kW, the high Q stray L on the hookups becomes very significant! I may get back to this kind of...
  6. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    Interesting! For testing at fixed frequency, a series cap would let me have a small effective reactance by cancelling most of the inductance, leaving the losses intact giving me a low inductive impedance to resistance ratio (low Q). That could be part of a solution, but the system finds its...
  7. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    When we tried that, we couldn't get the Q to be less than 1. Thanks, tho. Your thoughts are appreciated.
  8. I

    why sensor LM35 temperature sensor return same data in fixed conditions???

    The temperature is sensed by a semiconductor junction. The sensor itself is immune to vibration, as far as I can see. I think your problem has to be more of a system problem. This device can source current, but is almost floating if it has to sink current. Please pull the output to ground with...
  9. I

    why sensor LM35 temperature sensor return same data in fixed conditions???

    It doesn't look like it should be sensitive to vibration, when I look at the data sheet. It does have a line regulation spec. If you are running the device off 12V from the vehicle, the typical 10mV/V spec would look like about a degree C variation per volt. There could easily be interference...
  10. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    This is not a component in a product design. The intent is to attach this to an induction heater to simulate a particular heavily loaded coil. Resistors and their interconnects have inductance, and at this power level a bunch of power resistors would be required and have parasitic inductances...
  11. I

    [SOLVED] How do you make a Q=0.7 inductor, very high power?

    I have a non-communications requirement to build a test load that is around 2uH with a Q=0.7 at 30kHz. To make matters worse, I have to pump 100kW or more into it!. Water cooling is OK. It is turning out to be extremely difficult to get a Q that low at high power. Everything has been cut and...
  12. I

    Cooperative Underwater Acoustic

    I meant that as an individual embarking on such a project, I would be much less ambitious than as part of a team. You can implement a far more complex system when you have more man-years to spend on it.
  13. I

    Cooperative Underwater Acoustic

    Very interesting. Do your resourses match an ambitious development or are you looking for a more limited implementation?
  14. I

    Cooperative Underwater Acoustic

    Do you refer to an acoustic transmit/receive link for voice transmission underwater? What does cooperative mean in this context? I would expect situations with a direct acoustic path and indirect reflected paths that will be unstable in magnitude, phase and delay. Perhaps you could take a page...
  15. I

    Can I oversample multiple identical digitized impulses to create a composite? How?

    If I understand you correctly, you could make something like that work. I would generate a square wave of 50Hz samples, then subtract the recorded data square waves and generate an error term, by an offset and least squares technique or cross correlation. I would then generate a new frequency...
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