MP4, MP3 Player, Mobile phones, various devices can be charged from a computer’s USB port charger adapter also in these devices usually designed according to standard USB cable and PC with a single USB connection cable from the charging adapter can be made. Made in China mp4 player I’ve studied for use in a very simple charger has a charging circuit.

Oct 17, 2015. Hi, I am building this smps (schematic attached ) I have a question, since it's a half bridge topology the other end of the transformer primary is attached to half the mains rectified (capacitor middle) via a capacitor. Attached Files: 50khz-4n25-sg3525-smps-ir2110-smps-900w-70v-power-supply.png. Author: Topic: Current control for SMPS Arc Welding Machine (Read 21736 times) 0 Members and 1 Guest are viewing this topic.

Charger adapter is pretty simple 5-volt output that roughly consists of two parts of the section and charging control section Made in China Li-ion Charger Circuit Diagram.

Hi folks, so I built an smps from a schematic found on the internet. It works that far it's okay but it worked when i had a 70w load light bulb attached to the output, after i tried going with a 500w bulb things just went bananas aka exploded, everything in the chain was dead and cracked open, both IRFP460 the IR2110 and also the SG3525 was dead as I later found out when replaced all other parts and still got not oscillation driving the IR2110. Now i have had the same problem with other simple design smps, i guess when their simple their just not reliable enough under bigger loads.sadly they arent as robust and reliable as the age old transformers for mains. Now a few question, could the problem be the feedback loop via the octocoupler,maybe it senses too low of a voltage and increases the frequency or duty cycle of the SG3525 too much and the transformer due to back emf creates some spikes in the process which killed my mosfets and the ic's driving them down the line? The other option could be innapropiate transformer core or something along those lines? Also even though in the feedback loop the zener i had was rated 82 volts, i still got only +-70 or 140 v DC out from the secondary, why is that shouldn't the octocoupler work with the SG3525 error amplifier as to sense the voltage and keep approximately 4v above the feedback zener voltage by either increasing the frequency or duty cycle which one i dont know?

Ok my bad, I was wrong, yesterday i measured across the wire leads coming out of the lamp, turns out the very bulb itself had a bit corroded contacts, no problem for 220 volts but when measuring with multimeter they showed wrong resistance. I took the bulb out, it's a 230 volt 500w bulb by the way and ' ups' it measures 10 ohms, so yeah no wonder why the mosfets went absolutely 'bananas':D so I guess I should put some kind of a dimmer thyristor or something in series when attaching such a load, or maybe you know of some higher current rated devices which I could swap into the IRFP460 using now? I mean something that could work well in this design just with higher current ratings? I guess i have to keep the gate capacitances moderate I just don't know which devices are fine by the IR2110 and which could bee to 'heavy' for the IR2110 to drive? Yeah, the 10 ohm load at startup gave about 14 amps of load current and with about 140v DC after rectifier that puts the starting power at nearly 2KW, so my IRFP460 went dead.

The SG3525 that drives the IR2110 in my circuit has a soft start circuit and when i used the little bulb i saw it in action as the response was slow and delayed the bulb kinda didint shine at full from the start took a second or two. The SG has a capacitor for this. I did a search in my local stores provided device list and the best I could come up with was either IXTH24N50L or IXFH24N50. The originals mentioned in the schematic cost too much but these come very close or are even similar to the originals.anyway they are more powerful than the IRFP460. Download Tum Yahi Ho Talaash Mp3 here. I will look at fairchild too.