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Using IR2108 for three phase inverter
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hussamaldean:
Hi all
I want to use IR2108 mosfet to driver 6-mosfets for pure sinewave three phase inverter. however, I've noticed that the IC required the same input signal on IN-HIGH and IN-LOW. however, what I need is to use it to driver the upper mosfet then the lower not both of them together in order to obtain the pure sinewave i.e. when Q1 is PWMed, Q2 shall be on (LOW signal) and vise versa.
how can I achieve that ?
regards
the schematic is attached
sorry for the mess in the schematic but I did it in very short time just to give u an idea for the connection
langwadt:
yes you can use them, the complementary outputs on timer1 is for drivers like that (haven't checked if you got the right pinout)
hussamaldean:

--- Quote from: langwadt on November 03, 2018, 06:30:35 pm ---yes you can use them, the complementary outputs on timer1 is for drivers like that (haven't checked if you got the right pinout)

--- End quote ---
could you please elaborate ?
langwadt:

--- Quote from: hussamaldean on November 03, 2018, 06:36:37 pm ---
--- Quote from: langwadt on November 03, 2018, 06:30:35 pm ---yes you can use them, the complementary outputs on timer1 is for drivers like that (haven't checked if you got the right pinout)

--- End quote ---
could you please elaborate ?

--- End quote ---

the advanced control timer1 has complementary outputs on ch1,ch2, and ch3 (ch1n,ch2n and ch3n) so when setup correctly chXn is the opposite of chX and there is a programmable dead time every time they change

hussamaldean:

--- Quote from: langwadt on November 03, 2018, 07:17:52 pm ---
--- Quote from: hussamaldean on November 03, 2018, 06:36:37 pm ---
--- Quote from: langwadt on November 03, 2018, 06:30:35 pm ---yes you can use them, the complementary outputs on timer1 is for drivers like that (haven't checked if you got the right pinout)

--- End quote ---
could you please elaborate ?

--- End quote ---

the advanced control timer1 has complementary outputs on ch1,ch2, and ch3 (ch1n,ch2n and ch3n) so when setup correctly chXn is the opposite of chX and there is a programmable dead time every time they change

--- End quote ---
aha
but the IC requires both inputs to be same phase otherwise it won't work since I tried with not logic gate and function generator and the results didn't seem ok at all
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