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Check the support winding filter capacitor (once IC starts working through 300V line it needs a continuous dc supply for working which generally is fed through a separate winding + diode & filter capacitor)
Most of the time failure happens to this small filter capacitor due to stress.
if power...
Connecting 2 SMPS in series at the input side has a risk associated with it, if any of the SMPS input power is less than other SMPS (imbalance in the input impedance in spite of connecting secondary in series due to mismatched efficiency), that SMPS will get subjected to a higher voltage on its...
Multiple Layers will have large leakage (Although you have sandwitched secondry in primary) as the N X I flux cancellation is poor in multiple layers
If you sandwitch your secondary at each layer you can reduce the leakage. for example 19T primary then 12T secandary then 19T Primary again 12T...
The 2mm Gap will have more gap related losses, The reflected voltage on primary looks very small (54~55V) due to the selected ratio (3.21)
QR flyback will be more efficient compared to normal CCM or DCM current mode flyback as it gives an zero voltage operation for primary FET
& no ultrafast...
Check the Current F/B signal on the scope (with shortest lead length on GND- probe) for any noise riding above the signal, also check if current sense resister
is sized properly i.e. at full load you should allready reach 80~90% of the max signal on the IC PIN (1V in case of UC2843) if the...
Yes you can use this IC for variable output,
For mains step down transformer, rectifier & Filter capacitor design you will have to follow the same calculation as linear power supply , (although filter cap can be optimized if your lowest ripple tip is higher than your max output voltage i.e...
If your power is lower (in the range of 250W) you can design CCM mode of operation to take advantage of zero voltage & zero current switching, you will be able to use fast recovery diode for free wheeling
If part of the primary is shortted then the net effect is reduced number of turns on the primary causing more flux on the core (core can saturate loosing its magetic properties) & more peak primary current which will damage the winding after few Secs / min depending upon how many turns are...
You will need to measure input average current (before input filter capacitor inudctor i.e. close to input source) & input average voltage , multiply them & that will be your input power.
The switching currents will be averaged by your input filter that is why you should measure average inpur...
Boosting from 12V to 300V by conventional Boost may lower your conversion efficiency as you will be using an 500V FET for Boost switch (getting lower RDs on in high voltage is costly & there is an practical limit), but in isolated pushpull you still can use low voltage FET such as 40V or 60V...
Visit Power Linear Amplifiers - High-Current Linear Amplifiers, High-Speed Linear Amplifiers, High-Voltage Linear Amplifiers, they have standard power op amps which can be directly used without external
power stage, you will need to build an +/- 100V, 400mA power supply.
Visit different PFC controller manufacturers web site such as Fairchild Semiconductor | Power Management & Mobile IP Solutions etc. for more in depth working knowledge on interleaved PFC,
As you are aware off the drawbacks of single stage PFC, Interleaved PFC helps in reducing those stress on...
You can use copper bus bars (Solder-able type) to reinforce the PCB tracks also use multi-layer PCB with parallel tracks on each layer & multiple (PTH) Via's to stitch
the layers.
If you are planning to use relay for auto on/off application in street light, you can either use small or tiny solar cell, LDR (light dependent resistor), Photo transistor & building a small transistor comparator circuit you can turn relay on or off based on the ambient light.
For SMPS - high frequency transformer, general thumb rule is 400 to 500 Cm / Amp of current
but you can really reduce your wire size depending upon the number of turns & the loss /temp rise you can allowed in the wire. There are some very good articles from unitrode (now on TI web site) which...
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