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MLI using IR2110

EC.Engineer

Dec 11, 2016
1
Joined
Dec 11, 2016
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I am working on a Multi-level inverter and using IR2110 for driving the high and low level MOSFETs but I am facing a problem related to interaction between Q4 and Q1. They seem to cause some sort of a short in the circuit when both of them are on. Disconnecting either of them works fine but I need them both to generate the staircase signal.

This is the complete circuit design
m1VMvLV.png

Zoomed in:
RebDfUV.png



These are the gate signals generated by the microcontroller:
mXzI1dD.png


and these are the gate signals at the output of IR2110
hUPKwpo.png


g2 wave is not shown. It is exactly the complement of g1.


I need help in solving the short-circuit issue.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,507
Joined
Jan 21, 2010
Messages
25,507
Draw in the body diodes for the mosfets and you'll see the problem. I prefer using symbols which have the body diodes shown for this very reason.
 
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