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Type: Posts; User: FvM

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  1. Closed: Re: VFD to control 3 phase AC induction motor 400V 6000 rpm

    I'm already stumbling upon the motor specification. What is it? 6000 rpm at 100 Hz? Industry standard motors are specified for either 50 or 60 Hz.
  2. Closed: Re: 3 phase 400Vac 5000W Full bridge converter power factor correction Buck or Boost

    I don't know what's sufficient for x1.3 peak current, depends on the DC/DC stiffness. You should simulate the behaviour accurately before fixing the design.
  3. Closed: Re: 3 phase 400Vac 5000W Full bridge converter power factor correction Buck or Boost

    No. Without energy storage, each single phase converter has output current swinging between 0 and 2*Iavg. You can either implement energy storage sufficient for 100 Hz ripple in front of each DC/DC...
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    Closed: Re: Flyback Secondary RMS current

    Sure. Any operation point with asymmetric duty cycle. Peak current translates with winding ratio, average and rms does not.

    151891
  5. Closed: Re: 3 phase 400Vac 5000W Full bridge converter power factor correction Buck or Boost

    The threefold single phase solution has been already discussed at the begin of this thread. It's feasible but has some disadvantages. E.g. the energy storage of the single phase converters has to be...
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    Closed: Re: Flyback Secondary RMS current

    No, both average and rms are modified by the primary to secondary duty cycle ratio.
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    Closed: Re: Flyback Secondary RMS current

    That's true for a transformer with negligible magnetizing current but not for a flyback, where the output current is sourced by transformer inductance and primary and secondary current waveform are...
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    Closed: Re: ntc thermistor interface to MCU

    It's not actually clear if the original post is talking about limited accuracy of the NTC sensor or errors of the ADC and measurement circuit. You don't specify a NTC type, so we can only guess about...
  9. Closed: Re: CMRR simulation for fully differential amplifier

    The basic idea of the "simple" CMRR setups is to use the same configuration as in actual amplifier application. If it's a 4 resistor configuration, resistor mismatch matters also for real amplifier...
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    Closed: Re: Cold Start Charge Pump

    Regular CMOS logic won't be able to run from 0.38 V. Special circuit, preferably with depletion mode transistors is required for the cold start function. If the schematic in ADP5091 data sheet isn't...
  11. Closed: Re: CMRR simulation for fully differential amplifier

    Setup 1 is suggested in manufacturer datasheets, e.g. from Analog.
  12. Closed: Re: Voltage degradation in Hold mode of the bootstrap switch ?

    The effect is called "hold step", happens due to switch charge injection, in other words Cgd respectively Cgs of the switch MOSFET.
  13. Closed: Re: CMRR simulation for fully differential amplifier

    In practice, you don't need to measure differential mode gain to determine CMRR because it's defined by the feedback network with sufficient accuracy.
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    Closed: Re: RF Limiter not working as it should

    I would expect antiparallel diodes instead of two diodes with same polarity. What's your specification for the limiter (output versus input level, operation frequency)?
  15. Closed: Re: water level sensor circuit for wireless monitoring

    Industry standard level control relays for electrodes have adjustable threshold range, e.g. 1k - 100k resistance. It's suitable for drinking water, but not for deionized water. The latter can use...
  16. Closed: Re: CMRR simulation for fully differential amplifier

    Think simple. To measure CMRR, you'll apply a common mode signal and measure the respective transfer function.
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    Closed: Re: Spark gap degradation

    There's much literature about oil and gas filled HV switches, some results can be probably applied to sparc gap behaviour. I agree with wwfeldman that your assumptions are rather speculative.

    I...
  18. Closed: Re: How to make a 5V negative supply using the LM2576 regulator

    The shown 200 mV noise is just what you can expect from the simple circuit and layout. The 80 MHz ringing is mostly caused by the switching schottky diode.

    There should be a low inductance cap...
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    Closed: Re: Long distance ultrasonic range finder

    I suggest to study high voltage ultrasonic echo sounder circuits to get an idea how to implement voltage clamping in the receiver path. They often use a pair of antiparallel diodes limiting the...
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    Closed: Re: why does this simple program not work

    That's o.k. Problem is unsuitable combination of kp and ki, as already stated. kp=1 seems generally problematic. A controller with practical use has set point and process value inputs, by the way. I...
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    Closed: Re: Stability Analysis of DCDC-Conveter using PFM

    In case of doubt, derive the parameters in transient analysis.
  22. Closed: Re: How to design an class d output filter ( active filter )?

    Purpose of the design is still mysterious. You may use a SD-modulator to drive a three-level class D amplifier and place a passive LC filter towards the load to remove switching frequency. You also...
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    Closed: Re: Room Temperature using MCU

    Please specify "control speed".
    - on/off control
    - switching between discrete speeds
    - continuous speed variation

    In addition, what's expected about speed accuracy and load dependency? Does the...
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    Closed: Re: VHDL coding Status register read problem

    Registers assigned on both edges are sreg(0), sreg(1), sreg(3), sreg(4), ISA_DBUS2. It's easy to see the signals assigned under falling and rising edge. I can't imagine that ISE synthesizes the code...
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    [SOLVED]Closed: Re: Negative VCO transfer function

    Right. XOR detector transfer function is a triangle for square wave signals. Depending on the VCO slope sign, the PLL either locking on the rising or falling triangle part.
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