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Old 25th July 2009, 04:45 PM   #1
Orcino is offline Orcino  Brazil
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Default SMPS 2KW full bridge strange signal

Hi, i made a SMPS full bridge with IGBTs IRGP4063 and a drive IR2113, but in test with 90vdc i look a strange signal in gate high side the IR2113 , this is a normal ? or is a noise ? look en teh sch below.


Very tahnks
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Old 25th July 2009, 05:11 PM   #2
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Sorry for the tangent; I'm not the one to ask about switching PS's.

Is that Orcad you are using? I miss that app
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Old 27th July 2009, 04:47 AM   #3
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Is that stepped waveform on the transformer primary, on the gate of the upper IGBT, or is it the signal IN to the hi-side driver?

If it's on the primary winding(s), then it's probably either dead-time where both switch devices are in a hi-z state, or it's because of a PWM signal <50% and represents a similar "off" period.

I've worked on DC/AC converters and seen the exact same stepped waveform. The supply worked perfect up into the KW range and the stepped waveform didn't seem to affect anything.

Is anything ringing, getting hot, or excess idle current? Is the supply able to make the desired output power?

Cool project! If you don't mind, keep us informed on your progress as there is a lot of interest in off-line switching supplies; me included.
Paul
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Old 29th July 2009, 11:27 PM   #4
TechGuy is offline TechGuy  United States
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I've had this problem before. It happens with the gate controller is not providing a gate voltage above the Drain\Collector input voltage. For your High side IGBT or MOSFET, the gate voltage must be at least 10 Volts higher than Drain\Collection voltage. Other wise it does fully turn on the transistor fully. Check to make your Gate driver's bootstrap is working properly. It likely cause by a bad connection or a faulty bootstrap diode, or you accidentially connected the boostrap diode backwards.
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