Author Topic: Does this IGBT bridge meaningless ?  (Read 710 times)

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Offline Md Mubdiul HasanTopic starter

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Does this IGBT bridge meaningless ?
« on: December 16, 2019, 04:30:08 am »
Hello My Dear Friends!

Hope this post finds you well.

I am trying to develop a AC to DC rectifier 110V/50 A range.
Feeling that I am doing wrong on making the full bridge or half bridge portion.
The IGBT module I am using is FF75R12RT4,https://www.infineon.com/dgdl/Infine...2805fd8fd76151

890452-0

One module contains 2 IGBT that makes me confusing!
I need to understand my switching topologies first

Take a look my diagram, how the current flows back from primary winding of TR for a full cycle?
890456-1 [ Specified attachment is not available ]
1. When point A is positive then Q2 conducts, Q1 is OFF?
2. When point A is negative then Q1 conducts Q2 is OFF?
3. When point B is positive then Q4 conducts, Q3 is OFF?
4. When point B is negative then Q3 conducts Q4 is OFF?

Freewheeling built on doides are available, whats 2uF high voltage is doing here?
Hasan
 

Offline Berni

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Re: Does this IGBT bridge meaningless ?
« Reply #1 on: December 16, 2019, 06:53:16 am »
Umm... The schematic looks like AC/AC 3 phase to single phase converter, and the 2uF is simply across the supply rails.

You sure you know what you are doing here? Mains voltages at these powers are very dangerous, don't mess with it if you are not sure of how it works.
 
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Offline Md Mubdiul HasanTopic starter

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Re: Does this IGBT bridge meaningless ?
« Reply #2 on: December 16, 2019, 10:15:59 am »
Umm... The schematic looks like AC/AC 3 phase to single phase converter, and the 2uF is simply across the supply rails.

You sure you know what you are doing here? Mains voltages at these powers are very dangerous, don't mess with it if you are not sure of how it works.

A is DC+, B is DC- bus node. They don't change polarity. It's a regular full bridge, sketched in a rather nondescriptive way. 2uF are DC bus bypass capacitors, strongly suggested to avoid IGBT overvoltage caused by large di/dt.

Whats in your mind to be " correct " for " current' flow directions?
Hasan
 

Offline T3sl4co1l

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Re: Does this IGBT bridge meaningless ?
« Reply #3 on: December 16, 2019, 02:41:59 pm »
A and B are swapped.  Follow the diodes, it's shorted as shown.

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
Bringing a project to life?  Send me a message!
 


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