2012年5月21日 · The blue sine which shows 1 period is the fundamental. Then there's the third harmonic (square waves don't have even harmonics), the purple one. Its amplitude is 1/3 of the fundamental, and you can see it's three times the fundamental's frequency, because it shows 3 periods. Same for the fifth harmonic (brown).

2024年4月17日 · For example, if allowed output is 1mV at 10MHz, the inverter delivers 200V, and it's at the 10MHz/50kHz = 500th harmonic, which for a square wave is 1/500th the fundamental amplitude, or ballpark 400mV, so we require at least (400mV)/(1mV) = 400x, or 52dB, of attenuation between inverter and output at 10MHz.

Since the capacitor and transformer impedances are based on the relevant power frequency, that frequency is the fundamental for the harmonic order calculation. On other words, the formula is valid for either 50 or 60 Hz as long as the capacitor bank VAR rating and the short circuit VA are stated or calculated based on the frequency of interest.

2015年6月25日 · Suppose I'm using a 3.6 kHz carrier to reproduce a 60 Hz sine wave. To properly design a filter for this application to hit a specific harmonic distortion target, I need to know the harmonic content of the PWM signal. How can I predict what that harmonic content is? Is it going to vary dramatically with the pulse widths?

2019年9月19日 · \$\begingroup\$ The third harmonic of a triangle wave has another RMS value than the third harmonic of a square wave. The shape is extremely important. \$\endgroup\$ – Harry Svensson

Then the voltage swing produces more asymmetrical current and no longer is a symmetrical soft square wave but asymmetrical even harmonic producing fourier components of the distorted waveform. Then the apparent inductance drops quickly and is usually rated for …

2021年6月19日 · \$\begingroup\$ The layout has a huge impact here. Poor layout can cause unexpected/unwanted oscillations. For example, if you keep the switching loop too long or the area of the loop too big then, due to the parasitic reactive components (e.g. PCB traces, components' leakage/parasitic inductances, etc.), you may observe oscillations.

2014年1月24日 · Compatibility levels: Equipment is designed to tolerate / be immune to harmonic distortion up to some level, the compatibility level. If we can keep the power system harmonic levels below the compatibility levels, the equipment will work. (The compatibility levels are defined in IEC 61000.2.2 and IEC 61000.2.12.)

2022年8月31日 · Although new to me, my understanding is injecting 3rd harmonic into 3 phase delta improves the DC utilization of the generation while the 3rd harmonics cancel Line to Neutral. The same approach may also be used in Space-Vector modulation which is normally implemented by a DSP.

2019年5月3日 · Since lock-in amplifiers are non-harmonically sensitive , you can obtain better performance using Type I PLL harmonic mixers with the BW of the loop filter needed to reject the adjacent fundamental above the 3f harmonic by more than 40 dB which implies at -6dB / octave of -12dB from 1f to 3f at least a 3rd order to 7th order high pass , 1f ...