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Thanks for the feedback. Ill look into those. I've used a bunch of different kinds, power, current sense, self wound. I tried putting a series resistance in the primary but that didn't help. I'm not trying to pass acoustic signals but am working with an energy harvesting application...
Yeah, just a power transformer. Trying with some I wound my self for a flyback and also some I got that were professionally wound. I'm trying to use low frequency (20-500Hz) but even with higher frequencies in the kHz range, I have the same trouble. I see a slight result with higher frequency...
I feel dumb asking this question but can anyone help me remember what i'm doing wrong here. I'm trying to pass a small AC (1V) signal through a step-up transformer. I've tried 1:100 and 1:50 turns ratio but as soon as I connect the function generator to the primary, it gets loaded and the...
I'm not sure about German schools but in the US this type of degree is just Electrical Engineering and you take classes with a focus on Power Electronics. I wouldn't look for what school people say is "good" but find one that does a lot of research in this area. Get an assistanship doing...
Hey David,
It is the current that will charge your battery, as the equation above indicates, less charge current means longer charge time. However, in order to get a full charge, you will need to be able to achieve the full voltage with your charger. Think of current as water flow (kinetic...
That does seem pretty inefficient. I wouldn't expect the control circuit to consume much power for something like that. Must be a very poor rectifier circuit and inefficient DC/DC converters to handle driving the LEDs. You also have a night/day sensor on there so like alexan said, it's not...
Hey David, as long as the output voltage is the same and the current out is the same or higher, you're fine. Dont think of it as the power supply is supplying 4.7A as it is that the supply can supply up to 4.7A. The laptop will draw what it needs.
Ah, good point. Thanks! It's that converter and also the battery charger LT3650) that are getting hot. Unfortunately the LT3650 operates at a fixed 1Mhz frequency. It says there is built in protection that reduces the charging current if the temperature approaches 125deg C, so I guess maybe my...
I did get DRC errors, but ignored them. The board was made and I have everything on there working now just fine, so I guess that's another way to get vias in the ground pads. The only problem i'm having now is that My converter ICs are getting VERY hot. With a thermocouple leads touching...
Thanks, sorry if i wasn't clear. I will be using this to charge a battery so i need a fixed voltage on the output at 16.8V and then regulate the current to maximize the solar panel output. My trouble is understaning the pwm signals. I'll have four...2 for the buck switches and 2 for the...
Thanks, I've looked at this line of products but it appears that you dont have control over the output current. You can limit it but I need to be able to regulate it while also fixing the output voltage. I'm trying to build a max power point tracking solar panel battery charger. I'm currently...
Hello,
I'm trying to do a digitally controlled 4 switch Buck-Boost converter. I've done both a buck and a boost, but I'm not quite sure how the pwm signals relate with respect to the buck control side and the boost control side. Do you operate the controls such that if you're in buck...
Hmm, I may have a problem then. I just built the part, added it to the schematic, then in the board layout, I added in vias manually and named them the same as the ground polygon. Will this not work?
Thanks for the info!
By stacking inductors I mean i put a second one on top of the board mounted one and then soldered their leads together.
Well that was the trouble i had i think. I had a ground pad on the board as per the data sheets layout guide, but I only had 2 vias next to the IC (As shown in my second...
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