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Thread Tools | Display Modes |
10th February 2004, 04:42 AM
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Full-bridge transistor dead-time?
Does anyone know about how much dead-time would be needed between switching the two sets of transistors on a full-bridge inverter circuit?
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10th February 2004, 04:50 AM
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Just long enuf for the transistors to switch. You need to know how fast they are, or else make it long.
__________________
see my website: www.geocities.com/russlk |
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10th February 2004, 04:58 AM
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I realize that Mosfet transistors have a tdelay(on), tdelay(off), and fall and rise time delays. In finding out the total switching time delay time of the transistors, would I simply add the tdelay(on) and the tdelay(off)?
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10th February 2004, 05:04 AM
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rise and fall time
 hi,if you really want to know the rise & fall time, check the datasheet of the mosfet you are using. what are you trying to power up that speed of switching is imperative? 
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\"NONE BUT THE BRAVE DESERVES THE FAIR\" ~Shakespeare~ |
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10th February 2004, 05:11 AM
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I am trying to power a full-bridge inverter. I have some delay time between switching, but the circuit shorts out when 100VDC is applied to the input rails. I just want to make sure the deadtime is enough.
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10th February 2004, 05:03 PM
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Since one transistor is turning on while the other is turning off, the difference in delay time is of concern, not the sum. Since the Td(off) is longest, usually, If you add Td(off) +T(fall) and double it for safety, that will be OK. Something in the order of 200 nS, probably.
__________________
see my website: www.geocities.com/russlk |
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