I'm not familiar with this terminology. What power levels (In and Out) are we talking about and is there a transformer involved?Hi,
I would like to design a 12V to 340 V push pull converter with tl494. I would like to know if I need a gate driver IC for power MOSFETs?
Regards
12VDC input, 340VDC and 500W output. Yes, a transformer involvedI'm not familiar with this terminology. What power levels (In and Out) are we talking about and is there a transformer involved?
So for 500 Watts of output power @ 340 VDC you will need, assuming 85% efficiency, about 500 /0.85 ≈ 590 Watts of input power. That means you will need an input supply of 12 V @50 amperes. First of all do you have a 12 V supply with that capability? Second, these are seriously dangerous, possibly lethal, power levels. What kind of experience do you have with such circuits?12VDC input, 340VDC and 500W output. Yes, a transformer involved
It's necessary for my project. I am designing a pure sine wave inverter. I will probably use a car battery.So for 500 Watts of output power @ 340 VDC you will need, assuming 85% efficiency, about 500 /0.85 ≈ 590 Watts of input power. That means you will need an input supply of 12 V @50 amperes. first of all do you have a 12 V supply with that capability? Second, these are seriously dangerous, possibly lethal, power levels. What kind of experience do you have with such circuits?
A 12VDC to 340 VDC converter and a pure sinewave inverter are kind of different things -- don't you think? Why the obfuscation?It's necessary for my project. I am designing a pure sine wave inverter. I will probably use a car battery.
I am going to use 340VDC as a bus voltage. So first, I will boost 12V up to 340V and then I will chop 340V by spwm signals and filter it.A 12VDC to 340 VDC converter and a pure sinewave inverter are kind of different things -- don't you think? Why the obfuscation?
That voltage ratio is 28.33:1 which means your current ratio on the 340 VDC bus is going to be the reciprocal. I think this is going to be a heavy lift. Do you have a schematic for any part of this yet?I am going to use 340VDC as a bus voltage. So first, I will boost 12V up to 340V and then I will chop 340V by spwm signals and filter it.
It would be advisable. The output current capability of the TL494 isn't great so might not switch hunky MOSFETs fast enough to prevent significant heating.I would like to know if I need a gate driver IC for power MOSFETs?
So you recommend me to use gate driver?It would be advisable. The output current capability of the TL494 isn't great so might not switch hunky MOSFETs fast enough to prevent significant heating.
This IC is used a lot in ATX PSUs, they have "open collector" outputs and use Push pull slave transistors or MOSFETS to drive the transformer.I never used this IC before. So don't have much knowledge.
Thank you for your help.OK. I was curious enough about how you were going to get there that I did the following simulation. Looks OK except for some predictable losses which you will need to compensate for if you need exactly 340 VDC.
View attachment 216106
Enjoy
by Duane Benson
by Jake Hertz
by Jake Hertz
by Jake Hertz