some books
BROWN, M. (1990). Practical Switching Power Supply Design
BROWN, M. (2001). Power Supply Cookbook (2nd ed.)
Abraham I. Pressman. Switching Power Supply Design
find them and spend some time reading them , it will be much easier to figure out whats going inside smps thing,
BROWN, M. (1990). Practical Switching Power Supply Design
BROWN, M. (2001). Power Supply Cookbook (2nd ed.)
Abraham I. Pressman. Switching Power Supply Design
find them and spend some time reading them , it will be much easier to figure out whats going inside smps thing,
Alexsch,
Thank you for your advice. I am not theoretically so much enriched as I still study in school, but I have tested lots of circuits, many of which are SMPS, and read many books on SMPS brought from abroad (but sometimes I do not understand most of the lengthy calculations). I try to gather as much knowledge as I can get into my head, and then, try it apply it on the ground. Most of the cases, I may not be successful, but in case of push-pull, I have had considerably less failures.
I am using a power supply for my testing purpose which is utilizing push-pull topology. After making the first 12v 7a power supply, I made a new one and it is a working one: 12v 12A. I do not have any camera. If I get hold of one, I will certainly send the pictures.
I have used 1200v ESBT: STC08IE120HV, from ST Microelectronics. It is performing excellently with no problem.
If you do not use these 900v/1200v MOSFET/IGBT, then why are the companies manufacturing them? In my opinion, push-pull is more reliable than half-bridge (obviously, if you use the correct components). It also needs simpler circuitry.
I am not supporting anyone's configuration or criticizing it, but just talking in general regarding push-pull configuration. Each configuration has good and bad points. These should be carefully monitored and then the circuit made carefully.
Thank you for your advice. I am not theoretically so much enriched as I still study in school, but I have tested lots of circuits, many of which are SMPS, and read many books on SMPS brought from abroad (but sometimes I do not understand most of the lengthy calculations). I try to gather as much knowledge as I can get into my head, and then, try it apply it on the ground. Most of the cases, I may not be successful, but in case of push-pull, I have had considerably less failures.
I am using a power supply for my testing purpose which is utilizing push-pull topology. After making the first 12v 7a power supply, I made a new one and it is a working one: 12v 12A. I do not have any camera. If I get hold of one, I will certainly send the pictures.
I have used 1200v ESBT: STC08IE120HV, from ST Microelectronics. It is performing excellently with no problem.
If you do not use these 900v/1200v MOSFET/IGBT, then why are the companies manufacturing them? In my opinion, push-pull is more reliable than half-bridge (obviously, if you use the correct components). It also needs simpler circuitry.
I am not supporting anyone's configuration or criticizing it, but just talking in general regarding push-pull configuration. Each configuration has good and bad points. These should be carefully monitored and then the circuit made carefully.
Alexsch,
Observing the previous posts, I find that you are theoretically very enriched and hope that your practical knowledge is as good as your theoretical knowledge. So you might think about providing xyz9915 and everyone else on the forum a working, reliable power supply schematic which does not use push-pull topology. It would be very helpful for us - especially a novice like me.
Observing the previous posts, I find that you are theoretically very enriched and hope that your practical knowledge is as good as your theoretical knowledge. So you might think about providing xyz9915 and everyone else on the forum a working, reliable power supply schematic which does not use push-pull topology. It would be very helpful for us - especially a novice like me.
There are many applications that DO need them. Want an example? A 3-phase 265V phase-neutral ship power supply. 6-pulse rectify it, you get 650VDC. Now apply 30% safety derating, and you get 927V device. Mining may be an example. Power stations, trains.
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NEGATIVE!!! The half-bridge is more reliable. Inherently works with voltage mode, while can be easily adapted (merely a balancing low gage winding in the transformer) to current mode.The modified schematic is attached in which both AC mains & secondary sided are separated by two different symbols. the question is that the 0.1 ohms/10W resistor are sufficient to drive the transistor ( about 0.7v) or its value may be increased?
To, Areza: Thanks for guiding to understand the concepts, I have already read the book "Power Supplies, Switching Regulators, Inverters & Converters" (2nd Edition) by Irving M. Gottlieb.
I also pay thanks to Tahmid & others who encouraged me.
To, Areza: Thanks for guiding to understand the concepts, I have already read the book "Power Supplies, Switching Regulators, Inverters & Converters" (2nd Edition) by Irving M. Gottlieb.
I also pay thanks to Tahmid & others who encouraged me.
Are you using the Opto for current limiting or voltage feedback---- intersesting circuit- I have not read all the posts yet.
The 1 mfd cap. Have you considered a single mains smoothing cap-- your 330 mfd (just use one) and returning the chopper trx primary to the junction of two series conected caps across the 330 mfd. Possibly use 4.7 mfd. These components, and particularly your single 1 mfd is extremely highly stressed and needs to be suitably specified.
Pin 5 of the IR2110. What voltage do you expect to see here. Somethings going to pop 
You also need DV/T suppresion across the MOSFET's.
You also need DV/T suppresion across the MOSFET's.
Hi
Ok let say you would do like that, let say you got you current limited, what about voltage? you don't need that regulated?
Ok let say you would do like that, let say you got you current limited, what about voltage? you don't need that regulated?
2110s are a real pain if you don't get the layout just right so try to avoid it if possible. You can use a small gave drive transformer to do what you need- it will be more reliable in the end.
Here's one app note to help if you use the 2110s http://www.irf.com/technical-info/appnotes/an-978.pdf
Here's one app note to help if you use the 2110s http://www.irf.com/technical-info/appnotes/an-978.pdf
IR gate drivers are extremely reliable when used properly. To the date, in PCBs designed by me I have never managed to blow one due to negative transients and the like, but I did blew a few while experimenting with other people PCBs (due to bad layout).
COMP pin is not connected properly, it's the ground pin of the low side driver.
The two electrolytic capacitors in series are ok, they will produce far less trouble than a divider made out of smaller film capacitors because ESR keeps resonances attenuated. Their value may have to be increased, though, and rated ripple current has to be considered (multiple electrolytics in parallel may be required for proper reliability). A resistive divider is also required in order to ensure voltage balancing.
You can't do current mode nor voltage regulation without an output inductor.
The signal across the output current sense resistors will appear with the opposite polarity, so the connection of the transistor and the photodiode has to be changed.
Anyway, it will hardly work in average current mode as expected. You have to move the current error amplifier to the secondary side and use the optocoupler to remotely change the duty cycle (using the error amplifier of the SG3525A with unity gain).
You don't seem ready to success in such a project yet. You have to learn more.
COMP pin is not connected properly, it's the ground pin of the low side driver.
The two electrolytic capacitors in series are ok, they will produce far less trouble than a divider made out of smaller film capacitors because ESR keeps resonances attenuated. Their value may have to be increased, though, and rated ripple current has to be considered (multiple electrolytics in parallel may be required for proper reliability). A resistive divider is also required in order to ensure voltage balancing.
You can't do current mode nor voltage regulation without an output inductor.
The signal across the output current sense resistors will appear with the opposite polarity, so the connection of the transistor and the photodiode has to be changed.
Anyway, it will hardly work in average current mode as expected. You have to move the current error amplifier to the secondary side and use the optocoupler to remotely change the duty cycle (using the error amplifier of the SG3525A with unity gain).
You don't seem ready to success in such a project yet. You have to learn more.
this thing will kill the battery with in few month if connected directly (over/ under/manual charge), even if you some way can make this thing work other then blowing up,
On IR2110
Totally agree with switchmodepower. IR2110 have long delay times and will cause the entire control section to go up in flames should the bridge fail. They also necceciate the control section GND rail to be in direct contact with the power GND causing much trouble in the more complex and crowded SMPS boards. I think they are at best in 5-20KHz AC MOTOR PWM drives, not in a fast switching SMPS. The best way to go is to have a decent gate driver like MIC4424 followed by a gate drive transformer.
Totally agree with switchmodepower. IR2110 have long delay times and will cause the entire control section to go up in flames should the bridge fail. They also necceciate the control section GND rail to be in direct contact with the power GND causing much trouble in the more complex and crowded SMPS boards. I think they are at best in 5-20KHz AC MOTOR PWM drives, not in a fast switching SMPS. The best way to go is to have a decent gate driver like MIC4424 followed by a gate drive transformer.
...
Re: On IR2110
I've had great success using IR2113 (600V version of IR2110) in SMPS and sinewave inverters, all over 2KW and working between 30Khz and 100Khz. I can assure that these ICs are very reliable when used properly. In my PCB layouts sometimes they even survive when the power stage blows. A 100ns delay is not a problem at 100Khz and you can get 20ns-30ns crossover times anyway. I've also used IR2010 (200V version) at 320Khz in a class D amplifier without trouble.
BTW: 6N137 and HCPL2630 come very handy when control section ground is not the same as power stage ground.
Alexsch said:
I've had great success using IR2113 (600V version of IR2110) in SMPS and sinewave inverters, all over 2KW and working between 30Khz and 100Khz. I can assure that these ICs are very reliable when used properly. In my PCB layouts sometimes they even survive when the power stage blows. A 100ns delay is not a problem at 100Khz and you can get 20ns-30ns crossover times anyway. I've also used IR2010 (200V version) at 320Khz in a class D amplifier without trouble.
BTW: 6N137 and HCPL2630 come very handy when control section ground is not the same as power stage ground.
Re: Re: On IR2110
I've got 2110s to work reliably but they have their nuances and with inverter designs they are almost exclusivly required due to the 100% duty cylcle requirements.
But.... if I had my choice of 2110's or a drive xfmr, I'd take the transformer any day.
Eva said:
I've got 2110s to work reliably but they have their nuances and with inverter designs they are almost exclusivly required due to the 100% duty cylcle requirements.
But.... if I had my choice of 2110's or a drive xfmr, I'd take the transformer any day.
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