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Recent content by RCinFLA

  1. R

    Volt second imbalance in push pull converter.

    For its primary function, I would refer to a flyback transformer as coupled inductors but not a power transformer. Power transformer is coupled inductors but inductance of the inductors is counter to functional objective of a power transformer.
  2. R

    [SOLVED] current sensors vs current transformers

    Pretty narrow definition of DC current solely based on Fourier analysis. Turning on a DC device changes current so DC device that draws current must not exist. A DC to AC sinewave power inverter has a fullwave rectified sinewave battery current profile so it should be called an AC to AC...
  3. R

    Quadrature mixing in transceiver to select USB or LSB. LOSC phases needed?

    Instead of dealing with high frequency LO switching you could just swap I and Q baseband signals.
  4. R

    ✐ ☝ How to use PC power in sleep mode without blackout in the long run

    This is an operating system function in conjunction with hardware. The 'standby' mode copies present operating setups and RAM to hard drive and puts hardware in a power down mode. When you touch the wakeup button it wakes up hardware that pulls the configurations and restores RAM to point...
  5. R

    Question about USBc connector and its footprint

    Because USB-C can be plugged in either direction there must be mirrored connection duplication in the socket. USB-C jacks typically do not internally connect the mirroring in the actual USB-C jack, leaving it up to the PCB layout to make the common mirrored connections.
  6. R

    Reason for booms geometry/placement on a log periodic ?

    It is just physically easier way to get the alternating phase and required boom parallel impedance. There are some TV antennas that use a single support boom with criss-crossed high impedance balanced wire pair transmission line to interconnecting the elements with plastic insulators to support...
  7. R

    How many watts can do?

    The power and current specs for a MOSFET is based on infinite heat sinking. Current is also limited by wire bonds and package leads. Heating of the MOSFET will be the limiting factor which depends on your physical heatsinking capability. A MOSFET with lower Rds_ON will generate less heating...
  8. R

    Volt second imbalance in push pull converter.

    A permanent magnet with a coil wrapped around it will have no voltage or current in coil. This is what you will have if you allow the residual magnetism to build up in transformer core by running imbalanced switching currents-seconds. This reduces the AC flux induced delta before core...
  9. R

    Electric Vehicle Charging

    The picture you showed is not a charger. It is a charging port. It is an AC outlet that communicates with EV so EV charger in vehicle does not pull too much AC current from the given charging port AC outlet. The picture appears to show some charge level info reported to it by communications...
  10. R

    [SOLVED] current sensors vs current transformers

    DC does not mean constant current. The current measuring device much be capable of the desired measurment bandwidth.
  11. R

    High power DC (AC) rotary generator

    There are high voltage DC power transmission lines in western U.S. It feeds between the separate large area (unsynchronized) power grids.
  12. R

    About PFC Choke Coil

    Chokes on AC side before rectifier are for EMI backfeed suppression. PFC switcher is not totally clean for high frequency current EMI.
  13. R

    [SOLVED] Household domestic grid tied inverters will die out?

    What you will see is utility control on PV power push. If power company begins to lose control on system they will remotely command GT inverters in an area to shut down or at least prevent grid power push.
  14. R

    [SOLVED] why this circuit oscillate?

    Phase shift (delay) on R3,C1
  15. R

    Method to modify existing BMS for increased balancing current

    Many low cost BMS's for LiIon battery arrays use simple low current bleed resistors for cell balancing. For high AH batteries, 100 to 200 mA of balancing does not do much more then keep up with leakage current variation between cells. There are a couple of low cost boost switchers modules that...

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