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As in the prototype developed picture attached,
for point no.1 There are few hanging wires, and if your G-E are hanging gate voltage will be of distortion,whenever the igbt is switched.You can twist gate emitter wire and keep it at shortest distance.If possible design a small board with MOSFET...
Re: Current Limiting Elements & MOV for SMPS
NTC is selected based on the energy to be charged i.e. bulk cap to be charged say 0.5*C*Vdc*Vdc. and the minimum resistance of the NTC can be decided as Vpeak/Ilimit. Here I limit is the inrush current expected in SMPS.
Rminimum thus found is the...
How are the gate wired laid, can you twist gate and emitter together and shorten the length between gate driver and IGBT gate terminal or can directly mount on IGBT terminals if possible.
Is there any capacitor between gate and emitter,or Rg very large.Also there seems one notch while the...
Very good analysis albbg. Tantalum capacitors normally present low ESR, we can suggest appropriate based on voltage and ripple current rating and derating factors.
I need some good paper or derivations for ac ripple current rating required for DC link capacitor in terms of modulation index and power factor.Although i can get waveforms and decide based on matlab simulation.
As we know total Ilink^2 = Ilink_DC^2 + Ilink_AC^2.
Ilink_AC is the ripple current...
For ac drives or three phase inverter, the DC link capacitor calculations can be done based on the ripple voltage for Dc link voltage say 3% or 5% from the energy calculation i.e. 0.5*C*V*V =E.
But how to find the rms current rating for my case 4kw around 9A load current.
I cant put 9 A ripple...
If transformer is fine, then there may be problem with the feedback circuit. I mean you can check by giving 3.3V from outside to your viper switch and check for 3.3V output if its coming correct and this will verify if everything including transformer and your switching of mosfet, is fine and...
Re: value of capacitors in half bridge smps
Hey am also currently working on the same line.Am getting exactly the same problem i.e as soon as i give feedback prob starts i mean pulse get missing.But in open loop it works well and ya current sensing is like yours only.previously i did current...
Dear All,
I am using IC 3846 for 600V to 1110 V,1.5 A SMPS.
Actually initially am testing at low voltage say 60 Volts.
Whenever i give feedback of voltage and current. there is problem like gate pulse missing for some instants.I guess i am not able to tune the feedback circuitary well.
I mean...
Dear All,
I want to calculate the exact values of teh on and off gate resistance for MOSFET irf840.
I see from data sheet for my vgs 15V i have 55nc of charge.
So i will get ig=Qc(charge)/Time to rise.
If i take rise time say 1us or something like that.
The i can find Rg as Vgs/Ig...
Dear All
I am working on one project fo DC buck converter with input as 600 to 300Volts and ouput as 110V within that range.
My max duty cyclw will be 0.45.
Also i am using Half bridge topology for this.
I am having problem while designing the peripheral circuitary for output voltage feed back...
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