Large, Scary and Dangerous High Voltage MKP Film vs Low ESR Electrolytic Capacitors, ESR Comparison 

Very interesting content... A channel to make known... Thank you for the video... ✌

Using the MKP types for 50 Hz/60 Hz rectifiers (100 Hz/120 Hz ripple) would result in extremely low losses in the capacitor due to such low value of D, compared to electrolytics. Is the ripple current in the MKP type different (higher?) than in electrolytic type? The MKP type seems to have negligible losses and heating at low frequencies, is there any factor like ripple current that can cause hot spots at low frequencies? The white papers for HV MKP capacitors are typically for 10's of kHz or higher where there are actual losses/heating effects. Unless I am overlooking something, these MKP types appear to be an excellent alternative filter capacitor type for off-line/mains high voltage supplies, with extraordinary lifetimes, eliminating the problems of comparatively shorter rated lifetime for electrolytics (storage and operation at elevated internal temperature). The cost of DC link HV MKP parts is dropping significantly due to economy of scale in the industries they are being developed for. I wished for these decades ago. Am I missing something with regard to low frequency heating/losses? The only thing that comes to my mind is the ripple current, which may be the same for both dielectric types (at same capacitance), except for the higher ESR of electrolytics perhaps limiting that current. The MKP type seems to have no 'natural enemy' causing heating losses at low frequency ripple. If one has the available space in a chassis, the comparatively larger MKP type suggests need for replacement due to degradation is unlikely...ever. For modest values, say, 10 uF, the cost is comparable. This is not true if you compare 200 uF MKP and electrolytic. Thank you

Lovely MKPs! We want to play with them, right!

Hi Konstantin, it doesn't matter if the video is longer then usual, the contents are always interesting and without a lot of formula's that other channels use. Why electrons flow this and not that, and how components have a positive or negative region etc..... those things makes it unnecessary boring, and if they also start using a Arduino just for blinking a LED, then i'm out, because where is the fun in that. I use Ohm's law and some basic formula's, but that's it. That's my humble opinion offcourse. Regarding the ESR of Electrolytic capacitors, can reforming a new or "new old stock", or capacitor that is not used for very long time, have a influence for lowering the ESR ? Also, for measuring ESR of a capacitor (or internal resistance of any type of battery) can also be done in a unconventional way as follow : Set a function/signal generator to a 100Khz square wave and connect a DMM in current mode in parallel. Then write down the value that you get. Then connect a capacitor in series with the DMM (DMM set in current mode) to the function/signal generator, and the value is now lower. The difference between both values is caused by the ESR of the capacitor, and with Ohm's law the resistance in Ohm's can be calculated. For measuring the internal resistance of a battery, you need to connect a 1uF non polarized capacitor in series with the DMM (DMM set in current mode), this 1uF wil block the DC from the battery to the function/signal generator, but will pass the 100Khz square wave signal. With a good non polarized capacitor, the ESR of that cap is almost neglectable when measuring the internal resistance of a battery. Thanks again for the nice and interesting video. Grtz