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Old Fashioned Half Bridge converter
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Topic: Old Fashioned Half Bridge converter (Read 1327 times)
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Faringdon
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Old Fashioned Half Bridge converter
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December 31, 2021, 02:43:01 am »
Hi,
The attached is a well known, old fashioned open loop Half Bridge SMPS of 833W output power. (PDF schem and LTspice attached)
It relies on transformer leakage inductance instead of an output inductor. At 107us, there is an enormous shoot-through event due to the top FET turning ON, just after the diode of the bottom FET had been conducting. (This is during the startup event, but could also happen in load transients).
Would you agree that this SMPS really needs SiC type FETs? Eg as follows…
https://fscdn.rohm.com/en/products/databook/datasheet/discrete/sic/mosfet/sct3060al-e.pdf
Would you agree that the following non SiC FET is unsuitable here? (STW20NB50)…..
https://www.mouser.co.uk/datasheet/2/389/stmicroelectronics_cd00001063-1204680.pdf
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