bridge full wave 5A idc

0 220 50/60 hz

0 12 12

0 26 26

6 0 20

i need to compute that given can anyone help me to compute pls give email me the computation neilgarettadeva@yahoo.com or post here so that i can study what wrong in my computation........ thanks a lot!!!!!!

DESIGN FORMULAS FOR FULL WAVE EI CORE TRANSFORMER

I. computation of DC output voltage across secondary

Es = 2.35 * Edc

2.35 = twice the ratio of the RMS to the average value + 5% regulation

II. DC current (Idc) computation

Is = K * Idc = Is = 0.707 * Idc

non-bridge bridge

full wave 0.707 1.06

half wave 1.40 2.20

III. Output power computation: (Pout)

Pout = Es * Is Pout = Es1 * Is1 + Es2 * Is2 (this is used in multi-tap)

IV. Power input in Volt-ampere (VA) comp.

VA = Pout/ efficiency %

V. Tongue Area (A) comp. in sq. inch

A = sq. root of VA / 5.58 (5.58 is a given factor)

VI. Tongue Area (A), tongue width (tw), stacking height (g) computation:

g = tw = sq. root of A

Note: get the next highest value if sq. root of A is higher than standard

VII. Window width (W), tongue lenght (tl), in relation to tongue width (tw)

W = 0.5 * tw tl = (3/2) * tw

VIII. Primary (Np) & Secondary (Ns) turns comp.

Np = 3.49 * Ep * l^6 / f * B * A Ns = 1.05 * Np * Es / Ep

Note: 3.49 & 1.05 are given factors, f = frequency A = standard tw

B = flux density in gauss

IX. Magnetic wire size comp & Ip comp;

Ip = VA / source line (Eac)

dp = 1.13 * [(sq root of Ip / 2470 - 585) * (log VA)]

ds = 1.13 * [(sq. root of Is / 2470 - 585) * log VA)]

Note: diameter result refer to commercial size & use the next highest size if not of same value

X. Winding lenght (wl) comp;

wl = tl - (2 * 0.125) - (2 * 0.032)

XI. turn / layer (T/L) & # of layers (L#) comp.

T/L = wl / dp (w/insulation)

T/L = wl / ds (w/insulation)

L# p = Np / (T/L)

L#s = Ns / (T/L)

XII. Winding build - up (WB) comp.

WBp = L#p * (dp + 0.002)

WBs = L#s * (ds + 0.002)

WBtotal = 1.1 [(0.095 + WBp + WBs + (2 * 0.002)]

Note: compare WBtotal against Window width (W). it should not exceed 90% of W

XIII. Lenght (L) of magnet wire to be used for computation thru mean lenght of turn (MLT) of each winding

MLTp = 2 (tw + g + 4b) + (pi * WBp)

MLTs = 2 (tw + g + 4b) + [pi * (2WBp + WBs)]

Lp = MLTp * Np Ls = MLTs * Ns

XIV. Wire weight (Ww) comp.

Wwp = (Lp / 12) * (f/1000)

Wws = (Ls / 12) * (f / 1000)

Note: f = weight in pounds / 1000 ft.

all weight results should be rounded off to the next highest weight in terms of 1/8, 1/4, 1/2, 3/4, 1, 1 1/8 etc.

XV. computation of coild resistance (Rl), copper losses (Lcu), Core loss (Lc), voltage drop (Vdp)

Rlp = (Lp/12) * (R / 1000)

Rls = (Ls / 12) * (R / 1000)

Note: R is resistance / 1000 ft.

Lcup = Ip squared * Rclp Lcus = Is squared * Rcls

Core loss (Lc) = (Approximate core loss) * (Core weight) / lb.

Lc = (w/lb) * (lb.) / lb.

Voltage drop prim. (Vdp) = Ip * Rclp Vds = Is * Rcls

XVI. Efficiency (n) & voltage regulation (Vr) comp.

n = Pout / Pout + Lc + Lcu

Vr = (Is * Rls) + [(Ns + Np)squared] * Rlp / Es

thanks again....................................................................