Application for single AC stage input     

 Vin 220 Vac  311.08                                                正常输入电压

Vin range Vinnom 390 Vdc                                            输入电压参数

Vinmin 360 Vdc =Vinnom1*1.414*0.9*0.85                              最小输入电压

Vinmax 420 Vdc =Vinnom1*1.414*1.1                                   最大输入电压

Output information Vo 12 Vdc                                        输出电压参数

Io 18.5 A                                                           输出电流

Vf 0.56 Vdc                                                         输出二极管的正向压降

 Po 232.36 W =(Vo+Vf)*Io                                            输出功率

Frequency information Fr 100 KHz                                    谐振网络的谐振频率

normalized frequency  Xmax 1.5                                      开关频率参数 

Fmax 150 KHz =Xmax*Fr                                               最大工作频率

Fstart 250 KHz =Fr*2.5                                              起机频率

HB midpoint estimated parasitic capacitance Coss 80 pF    

"Cstray an additional contribution due to transformer's windings

and the layout" Cstray 10 pF    

Minimum dead time Td 200 nS                                         最小死区时间

conversion ratio  Mnom 0.032205128  =(Vo+Vf)/Vinnom                 正常增益

 Mmin 0.029904762  =(Vo+Vf)/Vinmax                                  最小增益

 Mmax 0.034888889  =(Vo+Vf)/Vinmin                                  最大增益

    

a at nominal voltage a 15.52547771  =(0.9~1.1)/2/Mnom               等效圈比

Calculate k so that the converter will work at xmax at zero load and max. input voltage k 7.222222222  =2*a*Mmin/(1-2*a*Mmin)*(1-1/Xmax^2)

 Kmax 10 

 Knom 7.222222222  =MIN(k,Kmax)

physical turn ratio Nn 14.55076378  =a*(knom/(1+knom))^0.5

"Qmax1, to stay in the ZVS

region at min. Vin and max. load" Qmax1 0.859609822  =1/(knom*2*a*Mmax)*(((2*a*Mmax)^2)/((2*nn*Mmax)^2-1)+knom)^0.5

effective load resistance: Re 121.0824771  =8*a^2*Vo/(3.1415927^2*Io)

"Qmax2, to ensure ZVS at zero

load:" Qmax2 0.618741429  =(3.1415927/4)*(1/((1+knom)*Xmax))*(Td*1000)/(Re*(2*Coss+Cstray))

Choose Qs, such that Qs =< min(Qmax1, Qmax2) Qs 0.587804357  =0.95*MIN(Qmax1,Qmax2)

Xmin work at min.input voltage and max. load: Xmin 0.939648464  =(1/(1+knom*(1-(1/(2*nn*Mmax)^(1+(Qs/Qmax1)^4)))))^0.5

Min switching frequency Fmin 93.96484642 KHz =Fr*Xmin

Resonant tank calculation Zr 71.17280759  =Re*Qs

 Cs 22.36176233 nF =10^6/(2*3.1415927*Fr*Zr)

 Ls 113.2750397 uH =Zr*1000/(2*3.1415927*Fr)

 Lp 818.0975093 uH =k*Ls

Parameters of L6599 Cf 470 pF

 Rfmin 7.547714759 Kohm =10^6/(3*Cf*Fmin)

 Rfmax 12.65669518 Kohm =Rfmin/(Fmax/Fmin-1)

 Rss 4.545256898 Kohm =Rfmin/(Fstart/Fmin-1)

 Css 0.6600287 uF =3/Rss

 0.464285714  

 0.439189189