Design Guide for Rectifier Use Datasheet by Hammond Manufacturing

\D,C:OSDXSec,\AC. K4 I D c, : 0,94 X See. I A.C. 7?

EUROPE

Basingstoke, UK 01256 812812

AUSTRALIA

Queenstown, Australia 61-8-8240-2244

CANADA

Guelph, Ontario (519) 822-2960

St. Laurent, Quebec (514) 343-9010

USA

Cheektowaga, NY (716) 630-7030 ©

www.hammondmfg.com

FULL WAVE BRIDGE Choke Input Load

Pri

V A.C.

Sec

V A.C.

I D.C.

V D.C.

V (Peak) D.C. = 0.90 X Sec. V A.C.

V (Avg) D.C. = 0.90 X Sec. V A.C.

I D.C. = 0.94 X Sec. I A.C.

Design Guide for Rectifier Use

Pri

V A.C.

Sec

V A.C.

V D.C.

HALF WAVE Resistive Load

V D.C. = 0.45 X Sec. V A.C.

I D.C. = 0.64 X Sec. I A.C.

I D.C.

Pri

V A.C.

Sec

V A.C.

HALF WAVE Capacitor Input Load

V (Peak) D.C. = 1.41 X Sec. V A.C.

V (Avg) D.C. = 0.90 X Sec. V A.C.

I D.C. = 0.28 X Sec. I A.C.

I D.C.

V D.C.

FULL WAVE Resistive Load

Pri

V A.C.

Sec

V A.C.

I D.C.

V D.C.

V D.C. = 0.45 X Sec. V A.C.

I D.C. = 1.27 X Sec. I A.C.

Pri

V A.C.

Sec

V A.C.

FULL WAVE Capacitor Input Load

V (Peak) D.C. = 0.71 X Sec. V A.C.

V (Avg) D.C. = 0.45 X Sec. V A.C.

I D.C. = 1.00 X Sec. I A.C.

V D.C.

I D.C.

FULL WAVE Choke Input Load

I D.C.

V D.C.

Pri

V A.C.

Sec

V A.C.

V (Peak) D.C. = 0.45 X Sec. V A.C.

V (Avg) D.C. = 0.45 X Sec. V A.C.

I D.C. = 1.54 X Sec. I A.C.

Pri

V A.C.

Sec

V A.C.

FULL WAVE BRIDGE Resistive Load

I D.C.

V D.C.

V D.C. = 0.90 X Sec. V A.C.

I D.C. = 0.90 X Sec. I A.C.

FULL WAVE BRIDGE Capacitor Input Load

V (Peak) D.C. = 1.41 X Sec. V A.C.

V (Avg) D.C. = 0.90 X Sec. V A.C.

I D.C. = 0.62 X Sec. I A.C.

V D.C.

Pri

V A.C.

Sec

V A.C.

I D.C.

Transformer Voltage: A transformer's required secondary A.C. voltage varies greatly with the type of rectifier chosen and filter arrangement.

Use the formulas below as a guide based on the D.C. voltage you require and the rectifier/filter chosen. All A.C. voltage references are R.M.S. Don't

forget to take into account losses (not included in this guide), especially diode voltage drop. Leave an adequate safety margin for D.C. regulator volt-

age requirements and minimum operating line voltage.

Transformer Current Ratings: A transformer's A.C. current rating needs to be recalculated from the D.C. load current. The required current

varies with type of rectifier chosen and filter type. Use the formulas below as a guide, shown for common D.C. supplies. Included in the formulas

higher peak to peak capacitor charging current in the filter.

Rectifier Selection Notes: When selecting rectifiers remember, average current in a full wave circuit is .5 x I D.C. per diode. In a half wave

circuit, average current is equal to I D.C. per diode. A rating at least twice the output current is recommended to cover turn on surge. In full wave

circuits, the reverse voltage rating should be in excess of 1.4 x V A.C. In half wave circuits, the reverse voltage rating should be in excess of

2.8 x V A.C.

Capacitor Selection Notes: When choosing capacitor voltage, allowances should be made for D.C. voltage rise due to transformer

regulation. Remember, R.M.S. ripple current in a filter capacitor can be 2 to 3 times D.C. load current. Capacitor life is greatly increased by reducing

it's temperature via less R.M.S. current or reduced ambient temperature.

Power