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I have this chinese 48v to 220 VAC/50Hz pure sine wave (by cnswi power) inverter, this inverter recently stopped working after its mosfet and igbt were burnt, now I am trying to repair.
Design of this inverter is typical type, on low side 2 series transformer driven by 8 mosfet at 31khz, their output is then rectified and I get aboud 350 VDC.
This high VDC is then inverted using a H-bridge (4 igbt) and subsequently fed to a LC filter to remove high frequency carrier waves, and I get 50hz pure wave. H-bridge is driven using a custom made riser board (visible on image, its not EGS002).
High side IGBT are heating up (H-bridge), so my question is, instead of rectifying and later using h-bridge topology, can I directly generate pure sive wave on low side itself (2 transformer), as these tranformers are high frequency capable and should be able to handle carrier frequency by an EGS002 driver board.
H-bridge are risky thing I feel and can get shorted easily, that is why I wanted to eliminate them. Is there potential drawback of this modification?
Thanks in advance
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