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Hi, I'm in the design process of a speed control for 3 24 volt dc fans with sensors input to a microcontroler. I'm using the pwm output of the microcontroler to control the 3 fans speed. I'm using a 24volt power supply for the fan using about 150 watt. My question is : Is there any reason I...

Hi itsmoked, Thanks for all the information. But I still have a question about the inrush current in the caps. Is there a simple way to limit the current to the cap? A resistor seem like a bad idea because of the 7A current. I was thinking of just choosing a bridge that can support more...

Hi, I building a 24vdc power supply at 7A ouput with four 2200uf capacitor for a total of 8800. I have some trouble selecting the right transformer for my application. Simulation give me a high peak current in the transformer but I'm not sure if this will make the transformer overheat and if...

Ok thanks that's what I will do and I will probably design my own because I already have a 48v transformer and everything else.

Ok I'm sorry about this your correct I did some more test and I only get about 2 amp on the line but the power factor is not that good would this be a problem to certified it in north america ? I would also like to know if there's a better solution to this thanks

Ok your right I'm gona start over. It's for a product that will be controled from a microcontroller with pwm output. The microcontroller will get data from different sensor like temperature, humidity, etc. I need to control 3 dc fan from the microcontroler. each fan is about 60 watt. So I...

Hi, itsmoked I'm not sure how to do this without a SMPS with PFC. I try to use a simple power conversion with a rectifier and a capacitor and transformer but the peak current that I was getting at the ac line was to high because of my buck converter at the output. Is there a cheap way to...

Hi, I'm currently in a design phase of a variable speed 48vdc control for a fan. I want to connect the fan on the ac line so i need a ac to dc converter. I found out that the best solution is probably to use a switch mode power supply for the firts stage and a pwm buck converter to control the...

Thanks everyone, so if I understand correctly if I want to use the HCPL-3180 ( http://www.avagotech.com/products/product-detail.jsp?navId=H0,C1,C5231,C4945,C4988,P93297 ) instead of using a IR2117 and adding a extra optocoupler to isolated my microcontroller I would have to had a bootstrap to...

Do I need a boot-strap circuits if I use a isolated 15v source for the mosfet gate driver ?

Hi, I'm in the design process of a non-isolated buck converter to get 70Vdc from the 115vac line and I have some trouble controlling my mosfet. I'm trying to control the mosfet from a microcontroller using a hcpl-3180 from avago technologie. The mosfet is on the high side, so I need a floating...