(ENGLISH)(MANUAL CLOSED CAPTION)(SCRIPTED)
(STEREO)(BUILT-IN MIC)(HORIZONTAL)(4K)(03/22)
Im sorry everyone, because i (wrong) record with hevc codec (h265), i had difficulty to edit because my old computer have trouble with driver when decoding h265 codec and not hardware accelerated h265 codec. This video need so much revision and more detail information that i miss when making video, but i cant edit the video because the software editing not stable, i will explain in my website later below.
Revisions:
1. To open case you only need unscrew 4 bolt at the edge.
2. To get the mainboard you need to uncrew bolt at the mainboard and 3 bolt at bridge rectifier, mosfet, and diode. Hard part is unscrew mosfet and diode because the bolt glued to metal part. Be careful! you need to have spare insulated thermalpad before disassembly because thermal pad is 1 time use only! or maybe you may experience mosfet blow because drain short to ground, and the diode too.
3. The mosfet is not alternating, they switch at same time because is forward topology, but still they are low side and high side, be careful!
4. They use mosfet gate transformer because is more easy to drive (you dont need bootstrap circuit) and ofcourse in this case the chip is needed.
5. Other componen omitted is live-neutral safety capacitor after common mode inductor, additional output electrolyte capacitor for store more energy , and maybe film capacitor output for high frequency filtering.
6. Maybe the fan control by ptc that drive some linear regulator, and detect load to adjust speed by inductor current sense at secondary.
7. At secondary retifier i think they can switch between diode and mosfet (for synchronous rectifier), actually the board designed for using synchronous rectifier with other controll chip at secondary, the manufacture can select topology by adjusting shunt wire connection. Ofcourse for high voltage like 24 volt its normal to use double diode rather than overkill synchronous rectifier for low voltage. The question is why the double diode is not identical? whats the reason? frequency? efficiency?
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Негізгі бет Ғылым және технология VLOG EN: MEAN WELL LRS-350-24 DISASSEMBLY / TEARDOWN PART 1
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