Power Amplifier AC inverter, PWM switching

Discussion in 'The Projects Forum' started by mido46, Feb 23, 2009.

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  1. mido46

    Thread Starter New Member

    Feb 23, 2009
    Hi all,
    I have to design a power amplifier ac inverter with PWM swithching of IGBT.
    The circuit has a (700Vdc input), (500Vac, 130 Aac output) .
    The swithching frequency has to be 40kHz with a LPF of (L=300 μ H, C= 940 nF) with a resonance frequency of 10 kHz.
    The first problem I found is that I can't find a suitable IGBT for this kind of circuit with a big freuency and current and also with resonable P losses ( around 350 Watt), I don't know if there is IGBT can work with this design or I have to parallel it?
    If I need to connect IGBT's in parralel, what is the limitations I must put into account to keep the circuit work with high realibility?
    Thanks in advance...
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