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tex6202018-11-16 17:23:18
Electronics
tex620, 2018-11-16 17:23:18

How to solve draft problem in H-Bridge circuit?

I made a full bridge circuit on the ucc27425 driver Mosfets
are controlled directly from the GDT, but there is a problem when both transistors on one side are open at the same time. (Short circuit / draft)
How to solve the problem?

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3 answer(s)
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pfg21, 2018-11-16
@pfg21

screw the switching delays into the shoulders.
usually they offer a resistor with a diode in the transistor control circuit, as a capacitance, the transition of a powerful transistor is used.
googled, every second shemka with them.

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n12eq3, 2018-11-16
@n12eq3

the exclusion of through currents in the finished circuit is a crutch, not good, ugly and unreliable.
the problem is solved from the side of managing the addition of deadtime or from the side of the driver, by replacing it with a suitable one. for double lower shoulders, this may not be present, but for half-bridges it is common, you need to look.

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Alexander, 2018-11-16
@NeiroNx

It seems that the driver is just needed so that this does not happen - it means that they chose the wrong driver.

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