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Dear All,
I am developing a Half Bridge Series resonant inverter for 1kW rating. The inductance is 22uH and the capacitance value used is 0.94u. However, the power generated is much higher and I need to operate at higher frequency of 58kHz to get desired output power level.
As the frequency is...
The issue was due to the gate resistor being damaged. it was measuring 56k instead of 10 ohm. However, now the regulation aspect needs to be check as output is around 20V.
The output and aux winding have same turns. The output is designed for 12V. Will increasing the resistor R2 (in path of diode in aux charging path) to say more than 25 ohm help. I have tried both 22 ohm and 4.7 ohm, but it has no effect.
Yes the Vcc is not stable. The simulation is working fine. I used LT1242 instead of UC3842 for simulation. Its attached for your reference.
But in actual hardware, the Vcc is like a square wave. Its swinging between 16 and 10V. Is there some sort of protection mechanism occurring? Because...
The first channel is input ac voltage: Scale : 100V/div
The second channel is Vcc voltage: Scale : 5V/div.
When I give supply 16V supply to the IC externally. It starts generating the sawtooth output and gate output at near maximum duty.
However, when AC voltage is given, the Vcc voltage...
Hi,
I am making a 12V supply using UC3842. The charging resistor is 50k. However, as I increase the input AC voltage, the Vcc Voltage is fluctuation. What could be the issue?
The converter is a flyback configuration with output at 12V and 12W.
Thanks Easy-Peasy for answer and along with calculation. I needed a decision between IGBT and Mosfet, a mosfet is way to go for this application.
However, there must some cut-off limit say input voltage/ current where IGBT starts making more sense as compared to Mosfet or vice-versa.
1714134381...
Basically I need to operate at around 40 -50kHz.The voltage input is 48V and output is 192V. Vcesat from datasheet is 1.65V where as the Rdson is16mOhm. Based on this it seems, that the conduction losses is higher for the IGBT based converter.
1713932190
The operation is in CCM mode. The...
Thanks Danadakk for the reply, But as a thumb rule calculation:
IGBT loss: Vce*Ic= 1.65* 20A= 33W
Mosfet Loss I^2 Rdson= 2*(12)^2*0.016= 4.6W
Based on this , MOSFET beats IGBT. I know this is a simplistic calculation. But if costing is similar, then isn't Mosfet better option. What other...
Hi all,
I need to make a simple boost converter for boosting from 48 V to 192V at 1.2kW.
I have need a suggestion regarding which would be apt device for the active switching device (IRF300P226 Mosfet (2 in parallel) ) or (FGH50T65UPD IGBT (2 in parallel)). Which would give lower overall loss...
I am using differential opam to sense AC voltage. When I give Vcc as 3.3V, and dc bias as 1.65V. The system is clipping even if the output does not reach the full 3.3V range (by changing the feedback resistors).
However, when I am using Vcc as 5V there is no issue. What could be the reason for...
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