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1000 Threads found on Filter Cavity
You are asking about off-line SMPS, which are comprised of a rectifier, a filter capacitor and a flyback converter. Unless you are designing a PFC flyback, you can power it with a DC source as well. To test an off-line SMPS with varying input voltage, you can use a variac (variable transformer).
Thanks, i am thinking , the straight RC second-stage output filter may offer good enough filtration, and has no problem with any instability like the LC second stage filter.....the problem with LC type is that you never know if the load connected is going to have a big capacitance and take the second stage LC resonance below 3xcrossover. Also, eg
just a note, most electro's are self resonant from 50 - 100kHz, i.e. above this they are inductors, they provide bulk storage for low frequencies only, if the Vicor sw freq is 750kHz, then the ripple could be 2x this - no electro will filter that ...
Surprising that the datasheet shows several filter circuits with impedance curve, but none is specifying the inductor series resistance. Basic electric circuit knowledge clarifies however that you can't arrive at these curves without inductor series resistance (or respective external series resistance, whatever causes it).
Hello, We are doing an SMPS using the DCM3623T50M53C2T00 Vicor DCDC module. Please assist us in getting at least 10mR of ESR in our external output filter. What we currently have is as attached. PSU Spec: ???????????????. Vin is 33V Vout is 48V Pout is 288W Crossover frequency of DCM module is 20kHz. The DCM module switches at ~750kHz
You forgot to tell us what is and post a link to a Timegrapher and how it is used. You also forgot to tell us that a piezo transducer, not a piezo beeper is used and it is used as a microphone. I looked in Google to see that an old Seiko watch produces 21600 clicks per hour which is 6Hz. The circuit might work if the reactance of C7 equals the res
Hi, In the Vicor DCM3623 DCDC module datasheet (below) , page 21, there is, at Figure 23, an LC input filter to some DCM3623 modules in parallel. Each Inductor of this LC filter has a 0.3 Ohm resistor across it. The Capacitors (?C1_x?) are all ceramic capacitors. Do you agree that the 0.3 ohm resistor across the filter inductor is (...)
Hi All, Anyone could let me know what topology or how the filter posted works?. 157850 Thanks
Hello, I am planning to measure the phase noise of a VCO using PLL technique using spectrum analyzer model # R&S FSL (9kHz - 3GHz). My question is what should i look for in the spectrum analyzer for measuring the phase noise. Do I need to plot the output of the LPF (connected at the output of the mixer) from 9kHz to, say, 100kHz? Then the re
With only around 60 dBc harmonic suppression, you need a filter to reduce the fundamental frequency magnitude between DAC and signal analyzer. DAC linearity is mostly measured with two-tone IM measurement, but problem is essentially the same, some filter is needed.
I have designed a dual-band bandpass filter but when I fixed the varactors and tuned, the centre frequency did not change. I want it to change as per my design. is there any thing i am not doing right please?. I need to finish my thesis
1. Which mixer to choose Passive or Active? Active will give much better noise figure, that is why so popular, consumption is not a trade-off if you need -110dBm sensitivity for the receiver chain. 2. Why they use Passive mixer for I-Q demodulator in case of impedance spectroscopy in many lite
As long as your loop filter has long enough time constant you can switch modulus 'on the fly' to produce intermediate division ratios. You don't have to select the exact division ratio for each frequency, you 'jump' each side of the ratio you need and let the loop filter find the middle ground. Brian.
There's the fundamental frequency and the carrier frequency. The carrier frequency is several times the fundamental. There's no particular formula. It depends on what's feasible for you to work with. A benefit of a faster carrier frequency: smaller L and C values are sufficient to filter it out.
Hello, there are some HAM radio operators around here, so maybe this is of interest. In our multi operator VHF/UHF contest location, we had an issue with the 144 MHz fundamental (!) signal beeing picked up by the 70 cm antenna which was driving the 432 MHz LNA into nonlinearity. That?s why we decided to add an additional high pass filter in
At one test Q3 failed, while doing a turn off, of triac Q1 and Q2, so it was not even on while failing. Suggest you get self-triggering of opto triac or main triac by high dv/dt. That's likely to happen with inductive load, RC filters for the opto triacs are suggested. Refer to application circuits for triac switching of inductive lo
Dear Members, What's the value for C1 and L1 for EMI filter, if I use 220V 50Hz ? Please see the schematic attached, Thanks 157434
Away from the remaining circuit it is difficult to be sure but the most likely reason is because R18 and C25 form a filter and without the high input impedance of the op-amp following it, the load would prevent C25 charging. Don't forget PWM is a pulsed signal, it probably wants converting to something nearer an analog voltage by the filter. Bria
I am trying to simulate a 2.6-cell resonant cavity in CST, and I need to fill the cavity with vacuum. As far as I can tell I have completely sealed the cavity, but when I try to fill it with vacuum the surrounding space is also filled with vacuum. How can I add vacuum only to the interior of the cavity?
I don't see a specific reason in the code for getting outliers in the first channel. Determining the absolute maximum of instantaneous voltage is however a poor method to measure AC voltage. A simple reason might be that the input voltage is actually distorted, or there can be crosstalk on the PCB. I would try with a low pass filter, e.g. 10