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Design a 230Vac to 5Vdc power supply circuit using Switching regulator?

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How Can I design a power supply circuit with:

Input voltage: 230Vac
Output voltage: 5Vdc , 500mA

Using a swiching regulator in my circuit....

What component should I use in this circuit?
 

How Can I design a power supply circuit with:

Input voltage: 230Vac
Output voltage: 5Vdc , 500mA

Using a swiching regulator in my circuit....

What component should I use in this circuit?
Click to expand...
Hi
Is isolation important for you ? if yes i think one of the best choices for you will be a flyback converter because your required power is low hence it can be a compact design !
Best Wishes
Goldsmith
 

goldsmith said:
Hi
Is isolation important for you ? if yes i think one of the best choices for you will be a flyback converter because your required power is low hence it can be a compact design !
Best Wishes
Goldsmith
Click to expand...

No,the isolation is not important for me =)
I just want to design a simple schematic circuit...
So is it possible to use a transformer, a rectifier and then a switching regulator(LM2596) to make this circuit?

which kind of transformer and rectifier should I use?

Thanks =)
 

Yes, it is possible. It's going to be quite simple. Use a 7.5V transformer. Even a 9V or 12V transformer will do since you're using a switching regulator. Use 4 1N4002 (or 1N4007) diodes as bridge rectifier, or use a 1A bridge rectifier. Then use the LM2596 regulator.

Hope this helps.
Tahmid.
 

Thanks, but I need to use "ExpressSCH" to design this circuit, anybody know how to use this software to design this circuit?
 

Tahmid said:
It's quite simple: **broken link removed**
Click to expand...

Thanks ^^

For the transformer i should use

Primary voltage : 280Vac
Secondary voltage :8V

OR

Primary voltage : 280Vac
Secondary voltage :28V
 

Is the primary voltage rating of the transformer 280V or is that a typo?

If it's a 280V to 8V transformer, don't use that. Instead use the other one. However, if it's a 230V to 8V transformer, you can use that.
 

Tahmid said:
Is the primary voltage rating of the transformer 280V or is that a typo?

If it's a 280V to 8V transformer, don't use that. Instead use the other one. However, if it's a 230V to 8V transformer, you can use that.
Click to expand...

O...Sorry, typo error...both of the primary voltage should be 230V ac
 

Tahmid said:
So, you can use the 230V to 8V transformer.
Click to expand...

Where can I find the transformer 230V and 8V....? I can't find it from element 14 or mouser electronics etc....I need the vendor part number and manufacture part number.

Thanks
 

Tahmid said:
Use them at the input and output of the regulator.
Click to expand...

I can use 0.1uF, 50V capacitor, right? (with 230V,12V transformer)

My friend using 230V, 28V transformer is this correct too?
 

28V transformer is also okay. Why do you want such a large gap (28V*1.4142135..... vs 5V output)? Do you expect large variations in input voltage?

Yes, use 0.1uF 50V capacitor. Don't forget to use the bulk electrolytic capacitors.

Hope this helps.
Tahmid.
 

Tahmid said:
28V transformer is also okay. Why do you want such a large gap (28V*1.4142135..... vs 5V output)? Do you expect large variations in input voltage?

Yes, use 0.1uF 50V capacitor. Don't forget to use the bulk electrolytic capacitors.

Hope this helps.
Tahmid.
Click to expand...

Thanks, but can I ask will the power rating of the transformer affect the circuit work....
Example...if I use primary voltage 230Vac , Secondary voltage 10V , The power rating 30VA transformer...will the power rating affect my circuit? Can I still use 2 , 0.1uF,50V capacitor?
 

Power rating refers to the maximum power that can be provided to the output. If you have a power rating higher than necessary, it's not a problem - in most cases, it's a good thing, since you have some headroom. However, remember that you won't be needing the extra power handling capacity. So, if cost and size aren't issues, you can go ahead use transformers with larger power rating.

Hope this helps.
Tahmid.
 

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