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Hello,My project is a 1kW high efficiency, 12 V DC to 230 V AC converter.My present question only concerns the 1st stage which is a step-up stage with following characteristics :
I would like to find the right PWM controller but there's a lot of part nums ! Here are the ones which satisfy my Vin and frequency constraints :
The controller must tune the ratio according to Vout and primary current.For current sensing, I still don't know if I will use a resistive shunt or a hall effect sensor. I'm open to suggestions.
To switch primary coils, I think to use 2 parallels MOS FET IRFP7430 (Qg=300nC , Rdson=1mOhm) on each branch (also open to suggestions).If I use a 2A gate driver, it gives me a 0.6µs theorical opening/closing time. Any idea if it is enough (considering the 10µs period) ?If it is good, I can choose a PWM controller with 2A drivers, if not, I can choose small ones and add external drivers.
Also perhaps 1st prototype will use standard diode rectifier, but for future efficiency improvements, I would prefer to use mosfet rectifier ready components (i.e. a pwm controller with sync output pin).
So, the main questions are : Which PWM controller do you recommend ? And is there useful surrounding components ?
Any advice is welcome.
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In reply to Colin Gillmor:
Hello Colin, Thanks a lot for your detail answers. I have ever calculated these advantages and drawbacks using diode or FET rectifier with these high voltages. Thanks, you confirm my result. Therefore, I will start with diode and perhaps try use MOSFET when I will improve efficiencies.
I didn't know separate gate resistors was mandatory for parallels MOSFET. Thanks.
I would like to use current mode control. Question, I don't know how to determine the maximum current to set, is it only the continuous input current (i.e. 110 A) ? Or is it higher ?
In reply to Adrien Zancan:
Thanks a lot for your perfect helpful answers !
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