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ͳɱƼЧʸߵĻתѹѳΪ100W150WԴƵijý˵ĵ·ȣתѹŵ룬Լܹṩ·ѡѹ·Ϊ

˻תѹõĻתͱѹIJһֱѹӦö꣬ڱѹожԡ

תѹ

شʱ·Уоڣͼ1ʾѹͶϼʹشʱûɵ·رտʱѹȦļڲñƽųߺʹоϴɵ·˻УֱоеľߵԴٴδ򿪡

תѹڼϻģʽ¡ڼģʽ£ͼ2FET/رʱоڴ洢ڻתȫӴоաģʽ£ͼ3оջת֮ǰFET͵Ļתѹɸݸɺѹģʽ¡

ԱӦǵ͵ѹʱ󸺺ɣתѹзΧڵ״Ϊѭڼ佫򵥵عرգģʽȴԴǻתѹһ̬ڶԴΧѹ͸ɽе

תѹƲ

еʽͨ޶תѹIJƷѭµ͵ʵ

V= L di/dtVin,min = (LpIppf)/(max)

Vin = ѹV

       Lp = ȦmH

       Ipp = ֵA

       max = ѭus

       f = нƵʣKhz

ڼģʽ

       = ½*Lp*I²pp*f

       Ipp = (2Pout)/(Vin,min* max)

תѹУPWMɵڡѹVin,min Vin,maxͬ

       min = (max) / ((1- max)C + max)

C = Vin,max / Vin,min

Ipp ֪

Lp = (Vin,min* max) / (Ipp*f)

Աоѡľ飬һֵ¹ʽøӽĹƽ

Ac*Ae = (((6.33*4)*Lp*Ipp*D²)*10^8) / Bmax.

     Ac = cm²

Ae    = оЧcm²

Bmax        = Bsat/2, Gaussо˽ϺԼƵʡ

D     = ·ֱλӢ

תѹ϶㣬Ϊڵˣҽʹһ롣ܻᵼ´оﵽ״̬

       Gap (cm) = lg = ((0.4**Lp*I²pp)*10^8) / (Ae*B²max)

ȷ϶Ⱥ󣬿Եõת

       Npri = (Bmax*lg) / (.4**Ipp)

       Nsec = (Np(Vp + Vd) (1-max)) / (Vin,min* max)

ʾģʽµĻתѹơִƲPFCУУλѹͨ䶯̬ʹΧѹûᵽPFC

Ʋ

Vinput = 85132 Vac

Voutput = 5Vdc @ 10A = 50Watts

Ƶ = 100Khz

max = .45

ģʽ

1)      ֵIpp

Vin,min = 85VacVin,min = 85*1.4-20VΪƺͶѹΪԼ100Vdc

ˣIpp = 2Pout / (Vin,min* max) = 100 / (100*.45) = 2.22 A

2)      min

Vin,max = 132Vac*1.4 = 185Vdc

ָ10%Vin,max = 203Vdc˴ȡ200Vdc

ָ10%Vin,min = 90Vdc

óѹC = 200/90 = 2.22

ˣmin = .45 / ((1-.45)*2.22+ .45) = .27

ЩпԵóѹVin ΧΪ200Vdc90Vdcʱеĸɱ0.270.45

3)      Ȧ

Lp = 90*.45 / (2.22*100Khz) = .18mH

4)      ѡо

ڱУѡܶΪԼ300 c.m/AIpp = 2.22Ac.m Ϊ300*2.22 = 666 c.m·ͼУ22 AWGֱΪ.028Ӣ硣ѡMagnetics˾ PҴĿ¼ѡBmax = 500 GaussóԼ100mW/cm³

ˣ

AcAe = (6.33*4) *(.00018Hy)*2.22*(.028)²*(10^8) / (500) = 1.59 cm^4. 

Ŀ¼PQ43230 (PQ3230)Уóߴ AcAe = 1.60 cm^4

5)      ϶

о֧·Уlg = (.4**.00018*(2.22)²*10^8) / (1.37*(500)²) = .30 cmԼ

6)      ת

Npri = 500*.30 / (.4*3.14*2.22) = 54ת

Nsec = 54*(5 + 1) (1 - .45) / (90*.45) = 4.4ת

ʹ5תΪ߻ģPCBδڡѡ·10A10*300 = 3000cmѡ16AWGΪתΪ̶ȽڱЧӦͭģöϸߣ422 AWG·൱ڵ16 AWG·

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