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OK, so I'll add a thin sheet of paper between the core halves before assembling them.
That means there will be some stored energy. I figure I could recover that stored energy through the AUX winding, by using an opposite polarity AUX winding, like a flyback secondary. Now that I look at some...
Actually , the 12V is the aux supply, which powers the pwm. I use external supply to eliminate the complexities of startup during raw testing.
Input to the SMPS is 120V line , or 165V link capacitor voltage.
The auxiliary winding is not used- it is open . power is currently supplied from an external isolated 12V supply.
This matter of remnant magnetization disturbs me though.
150mT is more than a third of total flux headroom. I thought the whole idea of soft ferrites is that they have negligible...
This is the schematic.
some part numbers are not right ( like the TIP3055 switch ) Eagle did not have templates for my MOSFET and some other parts, so I chose whatever component would give me the desired PCB patterns. For example All inductor pins are implemented as PADs, which I can...
Thank you kindly mtwieg.
It then means there is no saturation possible here, so spikes are the next suspect.
The volt seconds per turn are nowhere near saturation. ( 165V, 0.000006 s, 25 turns) ( ETD44, N87 ferrite ). I used triple-insulated wire and mingled the primary and secondary together...
So once you've properly designed for safe magnetizing current, and use a PWM that's internally limited in duty cycle, you never have to worry about transients destroying the circuit by saturation.
Although they could still destroy it otherwise. A hard transient, such as that created by flicking...
I am coming from 60Hz line transformer design, and somewhat new to SMPS.
I am trying to understand something about core saturation.
In laminated line trafo, the closest you ever come to saturation is during idle operation - no load on secondary, just magnetizing current.
Any current drawn...
As of Oct 01 2009 they are sampling again.
For a US account, with a corporate electronic firm email address, the website indicates:
3 sample orders max per 30 day period,
2 part numbers per order, 3 units max per part.
Although a "Fee" is mentioned before you order, the last screen in the...
Actually my breadboard testing has so far been under ideal conditions - drive pulses from signal generator, resistive dummy load, open loop on the PWM, etc, so if there were problems inherent in these HVIC's, I didn't give them an opportunity to surface.
So I Do want to be prepared for any...
fan7371 schematic
Thanks for reply
OK
I read both specs again sevaral times, to the best of my ability, since I'm not an engineer.
I'm beginning to see that the FAN7371 is OK in a full bridge, but would have a difficult time with something like a 2-switch forward.
And the FAN7085 might be...
high side mosfet driver
I am working on a Full Bridge offline SMPS using high voltages.
I had bought the Fairchild FAN7371 high side MOSFET drivers to drive the high side FETS.
https://www.fairchildsemi.com/ds/FA%2FFAN7371.pdf
I thought I had this thing worked out and was blissfuly...
avr microcontrollers free samples
Oct 24 2008
Microchip stopped sampling globally
If you look at the company's financials, you'll understand:
stock price at the lowest level in over 5 years, and has recently dropped about a third of its value. Income was flat 2007 to 2008, after showing steady...
triac lamp dimmer
I've just installed Elecronics Workbench Multisim 9, and was tinkering with a classic triac/diac lamp dimmer circuit.
Waveforms are extremely spikey, inconsistent, and at times just plain wrong. Some signal excursions are even higher than the AC input voltage.
If I...
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