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Includes Parameter Calculation in order to designing Flyback Converter
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DESIGN OF FLYBACK CONVERTER (A) PARAMETER CALCULATION
Name : Vania Kurnia Alvi
NRP : 1310171021
Class : 3 D4 Teknik Elektro Industri A
Date : 15 Mei 2020
Lecture : Bapak Ir. Moh Zaenal Efendi, M.T.
POLITEKNIK ELEKTRONIKA NEGERI SURABAYA
SURABAYA 2020
PROJECT WORK – 2020
DESIGN OF FLYBACK CONVERTER (A)
Design a flyback converter from these parameters and solutions
Component: Q : MOSFET IRFPG D : Fast Recovery Diode (STTH60L06C) L : Ferrit Core PQ 3535 with Cross sectional are (Ac=1.96 cm2) Co : Output capacitor (Co=? ;50Volt-100Volt) Rs : Snubber resistor (Rs=? 10 (20) watt) Cs : Snubber capacitor (Cs=? 1kVolt) Ds : Snubber diode (FR307)
𝐼𝑑𝑐 = (^) 𝑉𝑆(𝑚𝑖𝑛𝑃)𝑖𝑛. 𝐷𝑚𝑎𝑘𝑠
𝐼𝑑𝑐 = (^) ( 8055 ×,^56 0. 5 )
𝐼𝑑𝑐 = 5540 ,^56
𝐼𝑑𝑐 = 1 , 389 𝐴
𝐼𝑑𝑐 ≈ 1 , 39 𝐴
( 𝑉𝑆(𝑚𝑖𝑛) (^). 𝐷𝑚𝑎𝑘𝑠 ) 𝐿𝑚. 𝑓𝑠
∆I = (^719) , 94 (^.^8010 ×− (^6 0) ×,^5 40 ). 103
∆I = (^28) ,^407976
∆I = 1. 389
∆I ≈ 1 , 39 𝐴
𝐼𝑚𝑎𝑥 = 1,12 × ( 𝐼𝑑𝑐 + ∆ 2 I )
𝐼𝑚𝑎𝑥 = 1,12 × ( 1,39 + 1.39 2 )
𝐼𝑚𝑎𝑥 = 1,12 × 2,
𝐼𝑚𝑎𝑥 = 2,
𝐼𝑚𝑎𝑥 ≈ 2,34 𝐴
𝑛 = N Nps = (^) VoV+ VroF
𝑛 = (^) 20 +1,3^80
𝑛 = 3 , 755868
𝑛 ≈ 3 , 76
𝐵𝑠𝑎𝑡 =
𝐴𝑐 × n
𝐵𝑠𝑎𝑡 =
𝑁𝑝(𝑚𝑖𝑛) = L Bm .satImax.Ac 104 ; Bmax = 0,25 T; Ac = 1 , 96 mm^2
𝑁𝑝(𝑚𝑖𝑛) = 719,94.
−6 (^) × 2, 0,135692574 ×1,96 10
4
𝑁𝑝(𝑚𝑖𝑛) = (^) 0,26595744516,
𝑁𝑝(𝑚𝑖𝑛) = 63 , 34320138
𝑁𝑝(𝑚𝑖𝑛) ≈ 63 , 34
𝑁𝑝 = 2. 𝑁𝑝(𝑚𝑖𝑛)
𝑁𝑝 = 2 × 63 , 34
𝑁𝑝 = 126 , 68
𝐶 = 1. 562 , 5 μF
Split Wire (∑ split = 2) ; J = 4.5 A/mm^2 (current density)
o 𝐼𝑝(𝑟𝑚𝑠)𝑠𝑝𝑙𝑖𝑡 = 𝐼𝑝(𝑟𝑚𝑠)𝑡 ∑ 𝑠𝑝𝑙𝑖𝑡
o 𝑞𝑤(𝑡)𝑠𝑝𝑙𝑖𝑡 = 𝐼𝑝(𝑟𝑚𝑠)𝑠𝑝𝑙𝑖𝑡 𝑗
= 0.16 mm^2
o 𝑑𝑤(𝑡)𝑠𝑝𝑙𝑖𝑡 = √𝜋^4 × 𝑞𝑤(𝑡)𝑠𝑝𝑙𝑖𝑡
= 0.45 mm
Split Wire (∑ split = 10 ) ; J = 4.5 A/mm^2 (current density) o 𝐼𝑠(𝑟𝑚𝑠)𝑠𝑝𝑙𝑖𝑡 = 𝐼𝑠(𝑟𝑚𝑠)𝑡 ∑ 𝑠𝑝𝑙𝑖𝑡
o 𝑞𝑤(𝑡)𝑠𝑝𝑙𝑖𝑡 = 𝐼𝑠(𝑟𝑚𝑠)𝑠𝑝𝑙𝑖𝑡 𝑗
= 0.12 mm^2
o 𝑑𝑤(𝑡)𝑠𝑝𝑙𝑖𝑡 = √𝜋^4 × 𝑞𝑤(𝑡)𝑠𝑝𝑙𝑖𝑡
= 0.39 mm ≈ 0.4 mm
(𝐾𝑏𝑜𝑏) = π × 1, (𝐾𝑏𝑜𝑏) = 5,338 cm
c. Ion
𝐼𝑜𝑛 = 𝐼𝐿𝑀 = 𝑉𝑜
2 𝑉(max) × 𝐷 × 𝑅
𝐼𝑜𝑛 = 20
2 90 × 0 , 5 × 8
𝐼𝑜𝑛 = (^400360)
𝐼𝑜𝑛 = 1 , 11 𝐴
d. Voff
𝑉𝑜𝑓𝑓 = 𝑉𝑠 + 𝑉𝑜 (𝑁 𝑁^1 2
e. Csnubber
𝐶𝑠 ≈ 𝐼𝑂𝑁 2×𝑉×𝑡𝑂𝐹𝐹𝑓𝑎𝑙𝑙
𝐶𝑠 = 1,11×30. − 2× 𝐶𝑠 = 0,097941176 × 10−9^ 𝐹
𝐶𝑠 = 0,09 𝑛𝐹 𝐶𝑠𝑛𝑢𝑏𝑏𝑒𝑟 𝑐ℎ𝑜𝑜𝑠𝑒 ≈ 0,1 𝑛𝐹, 1𝐾𝑉olt
f. Rsnubber
𝑅𝑆 < (^) 2×𝐶𝑠𝑛𝑢𝑏𝑏𝑒𝑟𝐷𝑇
𝑅𝑆 < 0.5 ×^
1 40×10^3 2×0,1×10− 𝑅𝑆 < 62.500 Ω 𝑅𝑆 < 62,5 𝐾Ω 𝑅𝑆 ≈ 30 𝐾Ω 𝑅𝑠𝑛𝑢𝑏𝑏𝑒𝑟 𝑐ℎ𝑜𝑜𝑠𝑒 ≈ 30 𝐾Ω, 10 𝑊𝑎𝑡𝑡