Use your simulation to look at the current in the power supply leads, not the power supply voltage. I also I think you will need the second inductor, but it can be much lower than 100uH, maybe 1uH will be enough. This passive RC low pass filter calculator calculates the cutoff frequency point of the low pass filter ,high pass filter and band pass filter based on the. To prevent the power supply leads radiating EMI, I think you will need a much larger main decoupling capacitor. The diode in your schematic looks a little odd - I’m not sure whether you think it is a zener diode (which would explain the “10V” annotation) or a Schottky diode. But IMO it’s not necessary, provided you lay out the circuit sensibly. This helps ensure that your simulated filter.
Then request free inductor samples with the push of a button. You can create elliptic low pass filters using actual Coilcraft inductance values, not just ideal components. An RC filter cutoff frequency calculator would be very useful here. Coilcraft has teamed with Nuhertz Technologies to offer this customized version of their powerful FilterSolutions® software. A slightly more advanced design is to use higher order filtering as this will provide stronger rolloff beyond the -3 dB point in a Bode. Another design function for optimal equiripple filters is firgr.firgr can design a filter that meets passband/stopband ripple constraints as well as a specified transition width with the smallest possible filter order. This can be as simple as selecting a wideband op-amp and wiring a low pass RC filter to the non-inverting input. The resulting stopband-edge frequency is about 9.64 kHz. The resistance of the capacitor increases with decreasing frequency and vice versa. Anti-aliasing filter design is all about engineering the transfer function for an active filter. A simple RC high pass is a 1st order high pass.
1 ohm) in series with it, or use a diode feeding a parallel RC network like you had before. An RC high-pass filter is created by the series connection of the two components, whereby the output voltage is tapped above the ohmic resistance.
If you really must include a capacitor across the mosfet, place a resistor (e.g. So you should concentrate on getting those currents to have slow rise/fall times, and not worry about the rise time of the voltage on the mosfet drain. in the wiring to the Peltier and the power supply. What will cause EMI is fast rise or fall times in the wiring external to that circuit, i.e. Without the capacitor, you will get a fast rise time at the mosfet drain when the mosfet switches off, however that is not what causes EMI provided that you keep the mosfet, inductor, Schottky diode and main capacitor close together (and preferably shielded). That added 1uF capacitor is bad for the mosfet - you will get high peak currents which will heat the mosfet (and the capacitor may not last long either).