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And if SEPIC done with a coupled inductor, then the RMS current in the coupling capacitor is very much lower. But can you be bothered with a coupled inductor?
The Y caps help with B field aswell...because they re-route the disturbance currents such that those disturbance currents do not flow in such a wide area loop...whereby they would cause a high B field disturbance.
Actually since your injection transformer is likely with sinusoidal currents then...
yes because it is common mode noise that you are fighting, and this doesnt show on the scope.
1743270056
Another good way to get low noise from DCDC is to put it in a metal enclosure.....then have a plane in the PCB which is "chassis plane"....connect the metal enclosure to the chassis...
Looks good...since your noise abatement procedures seem to give good results...why not go further and do more noise killing...eg
1....the fet heatsink connect it to local circuit ground...(use insulation pads on heatsink if nec essary)
2...Use small Y cap across your injection transformer (ie...
So basically you want a buckboost type thing to go from solar to batt with output currnt control(?)
Easy cheap way is to just use uncoupled SEPIC and regulate the output currnt.
You know how to regulate output currnt?
(if not i show you in LTspice sim?)
SEPIC no high side fet drive
SEPIC no...
Just type in the attached pole and zero expressions to excel, and put in the frequencies where you think they are, and plot out...then you will get the equivalent plot.
You know every topology has poles and zeros at specific frequencies so go from there....for example a Buck in current mode ccm...
why not cascaded boost...surely you dont need isolation because your 12v is surely isolated?
Use eg ucc28c43 and use external error amplifier so you can adjust output volts....if you want i send LTspice?
12v to 400v is easy with a cascaded boost converter. Just use simple UCC28C43 based thing. If you want i send LTspice sim of it to you?
Search google "Cascaded Boost edaboard" because we have discussed it on here many many times.
Thanks yes, though i believe there are noise issues (as well as what FvM kindly points out) with around 22MEG and above.
...When you consider that in SMPS feedback loops, its pretty well taken as a golden rule that you need to keep upwards of 100uA in your output divider resistors otherwise...
Thanks, i am not aware of too many 10Meg probes...the common ones i know of all have 1MEG shunt and 9 MEG series if 10:1, or 1MEG shunt and 99MEG series if 100:1?
Thanks, and to probe this cct is going to need a home brew probe probably coax,
and a lot more than 100:1...and very low probe capacitance.
Home brew only?
Thanks, i know you mean "gases".:)
..if one observes the schem on page 17 of the TIDA-00756 in the top post, it is pretty simple....but the circuit that our consulatncy has done for us is way way bigger than this.....it has more than 6 times that component count. Would you say that page 17...
Thanks
Thanks, but all the photo diode datasheet that i have seen do not give an AC output current....its just DC current in proportion to the light exposure.
I wonder if you are referring to Johnson noise or something?, and how this will be more, the more is the DC current?...i think i read...
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