1kW smps project (based on MicrosiM design)

MicrosiM

Administrator
Staff member
Hi Micro, I have a question, the duty cycle always should work on 50% for not regulated smps ? whats happen if my SG not give me more than 47% DT ?


its normal to have 47% duty cycle, getting accurate 50% will require prper design.

Your SMPS should work without any problems with 47% duty.


Regards
 

antonamp

New member
Hi to all

I am planing to make this SMPS on 3.11 PCB but transformer will be with E55 core.

Could anybody tell me number of turns for primary and secondary side of transformer??? I want to have output voltage for +-60V.

Thank you
 

andre luis

New member
Hi microsin sorry my bad English, I'm with a source input 120/half, topology 220 ac dc 70amperes output a14volts 12.6 per but she's without any protection IC sg3525 drive pwm mosfet ir2110, I would appreciate your help, to add estaproteção to your de1kw source, then you'd have to put a trimpot of 1 k in place of the resistor protection acting what would this resistor in your scheme thank you very much
 

andre luis

New member
microsin this protection is of short circuit and overcurrent brief post schema with pcb here with the information for assembling Kit, but need help with protection.
 

blueice23

New member
Hello Guys,

Warm Greetings.
1.2KVA detex.jpg


I'm interested to make this SMPS but there's one thing that I would like clarify about the T2 A and T2 C windings.

T2:A and T2:B should have the same number of turns (20) and T2:C should have the 200 turns. Also the zener diodes in their respective positions in the winding suggests that T2:A and T2:B are symmetrical and higher number of turns should be at T2:C.

Thanks,
Neil
 

blueice23

New member
Hello Guys,

rombe570: You may use the schematic as posted above but please take note that the correct windings. It's 20 turns each for T2:A and T2:B. For T2:C it's 190 Turns.

netiks: It's a working schematic by Detex. But as mentioned earlier you may need to take note of the correct windings . Just use the appropriate core size and core material to achieve the power output you like.

Regards,
Neil
 

vindiesel

New member
hi everybody can i make an interruption and ask how to connect more than one ferrite transformer in the dc-dc stage to get more power with a push-pull configuration
 

netiks

New member
Hello Guys,

rombe570: You may use the schematic as posted above but please take note that the correct windings. It's 20 turns each for T2:A and T2:B. For T2:C it's 190 Turns.

netiks: It's a working schematic by Detex. But as mentioned earlier you may need to take note of the correct windings . Just use the appropriate core size and core material to achieve the power output you like.

Regards,
Neil

Ok friend thanks I saw there are mistakes in oscilator transformer thanks for the tip but can You tell me is this type of smps reliable with no regulation and so on I heard its dangerous not good desing and not reliable no short protection?
Regards
 

netiks

New member
Does anyone have experience with this self oscilating smps with no short protection only fuse is this enough? is this smps reliable for audio amps?
I dont like to smoke smps in the midle of the party :)
Is this SMPS from detex 1,2kw reliable?
Regards
 
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nwputra

New member
Dear Microsim and Gentlemen,

I am Ham Radio hobbyist, and I found this thread very interesting. I have some experience with PC SMPS and succesfully modify some for Ham radio purpose.
Mostly the modifications are to provide 13.8V DC needed to power Transceiver.

I wonder if the design that discussed in this thread can be implemented to power an RF Amplifier (A Tube amplifier), which require -say- 2KVA (2KV DC and about 1 Amp).
Some amplifier may require more power, perhaps 3KV DC with 1.5 Amp. How is the feasibility to do this ? What is the challenge or difficulties to generate High Voltage
using SMPS ? because if I search on the web, there are actually only few people actually do this experiments.

Thanks for your opinion and warm regards,


YB1NWP
 

MicrosiM

Administrator
Staff member
Dear Microsim and Gentlemen,

I am Ham Radio hobbyist, and I found this thread very interesting. I have some experience with PC SMPS and succesfully modify some for Ham radio purpose.
Mostly the modifications are to provide 13.8V DC needed to power Transceiver.

I wonder if the design that discussed in this thread can be implemented to power an RF Amplifier (A Tube amplifier), which require -say- 2KVA (2KV DC and about 1 Amp).
Some amplifier may require more power, perhaps 3KV DC with 1.5 Amp. How is the feasibility to do this ? What is the challenge or difficulties to generate High Voltage
using SMPS ? because if I search on the web, there are actually only few people actually do this experiments.

Thanks for your opinion and warm regards,


YB1NWP

Thanks,


I would recommend that you check this, http://w5jgv.com/hv-ps1/



Regards
 

nwputra

New member
Hi Microsim,
Thanks for your response, and I already check the work of W5JGV long time ago. I never found anyone else working on HV SMPS. So, I wonder why not many tried to do this.

RF Amplifier using conventional transformer is so heavy just because the transformer itself.

Best regards,

YB1NWP
 

MicrosiM

Administrator
Staff member
Hi Microsim,
Thanks for your response, and I already check the work of W5JGV long time ago. I never found anyone else working on HV SMPS. So, I wonder why not many tried to do this.

RF Amplifier using conventional transformer is so heavy just because the transformer itself.

Best regards,

YB1NWP


The only option you have is to make and assemble one by yourself, witch is the only option available now.

You can wond your own transformer, 1000V @ 1AMP, and you can make UNREGULATED SMPS, and test it


I can give you number of turns if you plan to start any time


Regards
 

nwputra

New member
Hi again,
Thanks for your offer, I am ordering parts now. Seems that EDT44 or 59 is not locally available. Perhaps I will just rewound PC SMPS transformer with drawback on output power. Also, I might just get IRF640 / IRF840 as transistors instead 460.

I am also thinking of making series of several "lower" DC (say 400 VDC) that resulting 2KV DC.

Your input are much aporeciated.

73 DE YB1NWP
 
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