Venkadesh_M
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You can't do everything with "a IC". I guess that these days some developers are hoping to get around developing circuits when they can use an application specific IC. But the truth is, you must know even more about electronic circuits to understand what exactly happens inside an IC, in case your design possibly fails.Yeah i also have the think of pulse transformers but I believe it is impossible to integrate it inside a IC.. so here is my problem how it is possible to level up to such a high voltage, is there any way without pulse transformer??
This is only the level shifting driver without the external bootstrap circuit. I think, you can understand from the internal schematic how the driver might work with an external floating power supply.Here is its block diagram they are leveling up but still taking Ho from Vb can not understand.....
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This is only the level shifting driver without the external bootstrap circuit. I think, you can understand from the internal schematic how the driver might work with an external floating power supply.
FvM,
Still a bit below 800V switched voltage you are targetting to?
Thanks & waiting for support to enhance the knowledge,:smile:
There are at least:
- a power supply (e.g. 12-15V) grounded to the negative bus voltage
- a bootstrap diode
- a bootstrap capacitor
- a low-side MOSFET that periodiaclly pulls the source node of high-side MOSFET to the negative bus voltage, so the bootstrap capacitor can be charged
A detailed explanation can be found in IRF, Fairchildsemi or other manufacturers driver datasheets and application notes.
Hi Venkadesh_M,
I need 230Vrms at the output of Half bridge Inverter,for this reason voltage across each capacitor in half bridge need to be 325VDC(total 650VDC) for peak,400VDC is the maximum voltage across single capacitor,likewise 800VDc(across series connection of bus link capacitor for half bridge),
Actually using two Mosfet of 600Vdc capacity i have tested for 365VDC(105Vrms) Output,where i have used floating supply for high side driver
Thanks & waiting for support to enhance the knowledge,:smile:
Not automatically, generally speaking. Some balancing means, e.g. passive zener diodes or active clamping circuits are probably necessary, also careful adjustment of driver signal timing to achieve simultaneous switching. MOSFETs are available with up to 1200V rated Vds, although there performance isn't mind-blowing, I would clearly prefer them over a fragile cascade circuit if still possible for the intended operating voltage.Do series connection of MOSFET divides voltage across each equally?
Why should it "get short"?During ON state of MOSFET,Zener will not act or it will also get short?
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