Author Topic: Looking for a suitable DC -DC buck conveter using coupled inductor /reactor  (Read 508 times)

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Offline Md Mubdiul HasanTopic starter

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Hello there,

Anser this post who knows Power Electronics well. ^-^

Take a look my buck conveter in attachment.
People may called it "Dropper'

It has following properties,

1. Input is 120 to 160 volt DC/ 30 Amp.
2. Output must be 110volt/30 amp(maximum). +- 5% regulation( contineous output should be 20 amps)
3. Isolated in both input and output circuit.

4. Shunt sensing.

5. proper feedback.

6. 2 switches gets OFF/ON  alternately.

7. May be soft switching.

8. May be 90% efficient.


I am thinking to modify it because bulky reactor/coupled inductor.
It has high current application.

kindly suggest a design that has
 
1. Less switching losss.
2. Less stress on switch.
3. Less number of component.
4. ZVS or ZCS idea.
5. Suitable ripple minimization.
6. Suitable couple inductor design.








Hasan
 

Offline T3sl4co1l

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Voltage mode control?  Two phase?  Yikes!

Yeah, get a current mode controller.  You may need some kind of high side sensing, like Hall effect sensors.

The inductors can't be coupled.

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

Offline Md Mubdiul HasanTopic starter

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Sir Tim!
Thanks a lot to recognize it.
Not sure why you have raised " Phase" in DC-DC buck action.
Because of 2 switch? Multiphase but not interleave?

Looking at this circuit it seems like a 2 conventional buck converter working at a time or alternately ! Need to analyze both DCM and CCM mode for the inductor. If its not coupled inductor that means 2 inductors are not magnitically coupled!
Can you see any " transformer" action on it?

As its output and input currents are same, then yes ! Voltage should be control.

Interesting to see its ON and OFF circuit. What would be the charging and discharging path in this circuit?No freewhiling action? 2 capacitors are helping charging or discharging through to load?

Input power isolation has done with some transformer and optocoupler.

Output can monitor by shunt sensing.
Couple inductor is more cost effective but high current and voltage need to be carefully solve. High current IGBT is only solution?

For HVDC application people use many IGBT in sequence !













Hasan
 


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