Dear All:

I'm rectifying a 12V rms AC voltage using a diode bridge.

I want to know how to calculate the capacitor voltage rating.

Do I have to multiply 12 * 1.5 or 12*2 ?

Thanks.
Alfredo Mendiola Loyola
Lima, Perú

 

The multiplier to go from RMS to peak is 1.404. The voltage on the caps will be a bit less, due to the conduction drops across the diodes. For a good safety margin, use a capacitor voltage rating of about double the calculated voltage.

So, 12 VRMS * 1.404 = 16.85 VDC. Use a capacitor rated for 35 volts.

 

The multiplier to go from RMS to peak is 1.404. The voltage on the caps will be a bit less, due to the conduction drops across the diodes. For a good safety margin, use a capacitor voltage rating of about double the calculated voltage.

So, 12 VRMS * 1.404 = 16.85 VDC. Use a capacitor rated for 35 volts.

Thank you for your Help

Alfredo Mendiola Loyola
Lima, Perú

 

The multiplier to go from RMS to peak is 1.404. The voltage on the caps will be a bit less, due to the conduction drops across the diodes. For a good safety margin, use a capacitor voltage rating of about double the calculated voltage.

So, 12 VRMS * 1.404 = 16.85 VDC. Use a capacitor rated for 35 volts.

Hey Beenthere,

When did they change the value of the square root of two? I missed it. How do I update the programming on my TI calculator?

Just kidding of course. My fat fingers frequently get me, too. At least yours are consistent.

 

Wow, I've been dropping the 1 out of the value for years. For the record, it's 1.4142136 on my TI.

Let's see, that's 16.97 volts.

 

Olde age tends to let us lock in pre-conceived notions. From your avitar, I can only guess tht I have a couple of years head start on you.