150W LED power supply teardown 

He good.

Chinese LED drivers sometimes hit or miss (mostly)

Thanks for your support ;)

What is the model of ossiloscope? ​@@DiodeGoneWild

@@requiem4adreamc FNIRSI DPOX180H, i have one and it has annoying bugs mostly on trigger, and the voltage levels calibration are far from good... buy at your own disappointment risk... Of course it has also some good things like the screen but watch some reviews first at least, but don't believe in most of them saying that everything is great and awesome because they are paid or get the instrument for free to advertise sales.

haha. Junk design.

How much does the unit cost? I can't imagine this being something that touches my bench with our cost of living. PS. I rewind and looked up a Philips Xitanium. At €20 me opening and looking at it, if only to do a quick fix, would break-even with a new unit.

@@stefflus08 Not sure about the price but here in Bosnia it makes sense to fix them for 15 BAM rather then to rewire and retrofit other makes or models but recently i experimented with Lisun and so far extremely happy with the results. Plus for 10 Bam more you can use flicker free driver and adjust the current down to increase lumen/watt. Depends what costumer wants in the end but most of them would rather pay 80 BAM and upgrade rather than buy 450 BAM light fixture.

That's what i though, why such a "powerful" micro in a "simple" led driver? I guess it handles everything including the inductor switching, and it may be cheaper and easier to implement that a bunch of different interconnected controllers and auxiliary chips.

Giant thanks for your support!

Just snip some of the current sensing resistors on the output.

Get electroboom to do that it'll be so funny 🤣🤣😂

@@davey2k12 🫡😂

That sounds like it might be an unregulated supply. It would be like the classic 2-transistor fluorescent driver circuit but with a transformer+rectifier instead of an inductor+lamp. Or I could be totally wrong. Since you're saying the output transformer has many wires I'm most likely wrong.

​​@@eDoc2020Thanks for your reply. These are GME Electrophone PSS100 switch mode power supplies sold as 13.8V DC supplies for CB radio use. Rated at 13.8V-4A continuous, 12V-5A peak. On the box it states, fully suppressed for radio equipment, car stereos etc, but they don't state regulated output as such. I can find circuit diagrams for their other GME classic linear iron transformer power supplies ie. PSA123, PSA126, PSA1210 but nothing found for these PSS100 supplies. These PSS100's are made in Taiwan, and the circuit layout seems to share a lot of similarities to a half bridge design, but don't use a TL431, or optocoupler, or switching chip etc so I'm really not sure how they control the switching of the two MJE13007 transistors, or how they regulate output if they even do. The other thing I'm not sure of is what the DB3 Diac does, and if it is a significant part of the control circuit etc.

That would be very steep...

Lots of cheap LED bulbs put a lot of 9 or 15v diodes in series to get up close to mains voltage. Then a linear current regulator dropping a few volts to set the current to some safe level and keep it regulated as the bulb heats up and the diode voltage changes.

Of course, but there still has to be the regulator. It can't be just the LEDs alone.

@@DiodeGoneWild Why not come close to mains voltage, and then drop the rest using a resistor?

Half the input bridge rectifier carries the input current burden, and makes polarity irrelevant.

I guess a 33uF 450V capacitor would do, but the designer was in a series mood, or the 350V capacitors were cheaper, or maybe they had a much lower ESR or a higher temperature rating.

Czech sockets are polarized. And even in countries where sockets are not polarized, permanent wiring still keeps N and L. This thing isn't probably connected using a socket.

@@DiodeGoneWild a keyword: "Europlug" - for sure not polarized.

Practices differ mainly in the area of polarization. Typically, Europeans do not maintain consistent identification of line and neutral throughout their power system as is the practice in North America. Consistent with this practice, the Continental European plug can be rotated to either of two positions and plugged into the socket. Thus, the common electrical system in Europe is unpolarized (i.e., line and neutral are connected at random). In fact, most plug types used in Europe are not polarized.

It surely would be more costly and lossy to isolate it.

@@DiodeGoneWild I believe the losses would be the main reason due to certifications and energy efficiency class, they even went to the trouble to add a pfc circuit.

🇵🇱

Her name is Veritaska (but with an accent or two).

@@eDoc2020 thankyou, appreciate it 👍😀

What is wrong with people spamming emojis

This is not a fake comment or spam. I love watching this man and I follow him from Egypt. I learn a lot from him.. Anyway, welcome.@@Camera-0002

You can adjust the playback speed by tapping on the gear icon.