Recent content by ron simpson

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  1. ron simpson

    Noisy PWM output signal

    Pull the input pins of the gate driver off the PCB. Add a RC to each pin. I used 100 ohms and 47pF. The capacitors must connect to the ground pin of the IC. I measured the frequency and set the RC time constant to just under that frequency. You probably do not have a good signal at the...
  2. ron simpson

    LFP batteries Ampere-hour comparison

    "load" 1kw load at 450 volts is 2.2 amps. 1kw load at 48 volts is 20.8 amps. First we must define what LOAD is. It could be 1kw. Or it could be 2.2A or 20.8A. I normally think watts because that is a measurement of work or energy. Amps is volume. Electron flow has no energy in it unless...
  3. ron simpson

    LFP batteries Ampere-hour comparison

    If your load was a 1kw light bulb each battery will last 10 hours. (more or less) The two batteries have the same ability to hold power. If you load was 20 amps, then Battery-1 will last 10hours and Battery-2 will last about 1 hour. (20a x 28V is very different than 20a x 450V in watts)...
  4. ron simpson

    DC Motor controller

    So the start up current could be 30A? or more.
  5. ron simpson

    Power/control circuit isolation

    Boost almost never uses synchronous diodes. Synchronous diodes are only used at low voltage. (not 36V) How much current? How much power per TV? Here is an example, from data sheet, of 12V to 24V at 1A. Pretty simple. To get 36V try changing R1 to 1.5X. The max current will drop some.
  6. ron simpson

    Power/control circuit isolation

    There is not enough information to know. I need to know much more about where the power goes and comes from. What is the load? Example: Input power is "+12V" and "Ground" 12V at 550 watts. Output is "50V" and "Ground2" at 500 watts. If Ground and Ground2 can be the same thing...
  7. ron simpson

    Does drain current go up if doping also goes up?

    Likely the units are in error. (numbers)
  8. ron simpson

    Does drain current go up if doping also goes up?

    There are very few engineers on the earth that think at the "doping" level. Some of this is tough in school but none of the students will ever make their transistor. 10kA 1V transistor? The leads would have to be solid copper bars, or straps like car battery cables but much larger. Here is a...
  9. ron simpson

    Capacitors in Series

    The capacitors have different leakage current. The one with 1.2V is leaky. Put a resistor across each cap. The resistors will make a voltage divider so each has 1/4 of the voltage. There is also a chance the capacitance is not equal. If the bottom cap=47uF and the top cap = 10uF the...
  10. ron simpson

    How do you connect these battery tabs?

    Remove the shrink wrap. It is there so the batteries do not get together during shipment.
  11. ron simpson

    Power Conveter at Zero Load

    At no load a power converter goes to zero duty cycle.
  12. ron simpson

    Looking for Small Enough Variac

    Don't look for small, look for low cost.
  13. ron simpson

    Bootstrap Gate Driver Question

    Michael Mayorkas It is hard to know what your question is. This schematic is in the data sheet for the 3120. What " cathode to the anode " ?
  14. ron simpson

    Pulse Transformer Issues - Need New PT

    Please put up more information. Part numbers for both transformers. Schematic.
  15. ron simpson

    Making My Own Ferrite Toroid Core

    Because we don't know the mix of Iron & Zinc, and we don't know how dense the mix is, you will have to make a coil and see how it saturates. Do you need help with that?
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