Question

As a power electronics engineer, you have been contracted by a mobile phone manufacturing company, STK Mobile, to design a converter to supply power to the microprocessors for the mobile phones. Your task is to design a converter to meet the following specifications: a). the microprocessors operate effectively at 8 V and 1 A. b). continuous current conduction mode at all the time. c). peak-to-peak inductor current should not be more than 30% of its average value at all operating conditions, d). output voltage ripple should not be more than 2%. NOTE: Typical output voltage of batteries for the mobile phones range from 3.6 V to 12 V DC, depending on the charge state.

Answer 1

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a) •> Block Diagram TDC-DC convoy LOAD y switch mode + Full Bridge LC type { filtered Feedback <Rectifier)

by Full Bridge Rectifier *) Explanation ~ from the AC power supply, sinusoidal voltage will be converted to de filter will reduce ripple of de wave sm de-de converter will reduce the magnitude of de voltage. → Feedback will help to maintain constant de output voltage LI To RL AP3 Vo(+) -C2 D5 EN 263 DI + GolZ L2 D4 D2 OF Gate eek v=230V <ce=Control circuity Di, D2, D3, D4 - Normal diodes D5 = High frequency diode: so power mosfet (IRFP450) Ti = Flyback transformer,

exeplanation through diagram 个 Vo 'N2 The converter used as de-de conversion medium is - Flybaew converted, Design of flyback converter Assuming V2 → purede, ID V2} {D = Duty ratio) Lets set, (Nz/N1) (1:10) so, As, V2 = 2(%) 2 for, Vo= qV; vo 207.07 V

De Ni IN2 z (Vo/v2) 0:38 whew, soni N2 2) V2 = 22.11n {t,= D/) + Vo Whew, st off: di tvo=0 dta {+2. =(-D)) 2 12 di using equeo and (di) = A IL = N2 x VzxD(1-0) mi fekk 2010) 0.3 A Lets, say, f = 100 kHz ( switching freq. ofs) for, AIL = 307, of IA Nz V₂ D (1-D) Ny f L₂ 50, < 013 so, L2 > 48.78 MH Lets, take, L2 = 50ult

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Again, it can be shown that AVO N2 V2.D(ID) Ni 8 frezLz As, given that, avo 2. Of 8V 0.16V Sog C3 ) 1.21 MF so, Lets take, C3 = 13 MFI Filter design! L1 = 10,MH 1 This will give smooth C2 = I'm F de output. *> explanation Flyback conv. through graph I 229 [EDIf Iole