Datasheet > AN-6026

AN-6026

更新时间： 2022-10-09 17:36:45

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正
页数	文件大小	规格书
23页	346K
描述
Design of Power Factor Correction Circuit

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AN-6026 数据手册

AN6026

APPLICATION NOTE

4) Output Capacitor Design

leading current, which causes phase difference between the

line current and the line voltage. The phase difference

increases as the capacitance of the input capacitor increases.

Therefore, the input capacitor must be smaller than C_in(max)

calculated by Equation 12. C_in(max)is the sum of all the

capacitors connected at the input side.

The output capacitor is selected by the relationship between

the input and output power. As shown in Figure 13, the min-

imum output capacitance is determined by Equation 14.

PFC

V_a= V_A= V_{in(peak )}cos(ωt)

(9)

V_O

C_O

i_a= I_acos(ωt)

−

i_A= i_a+ i_c= I_acos(ωt) − ω ⋅C_in⋅V_{in(peak )}sin(ωt) (10)

Figure 12. PFC Configuration

ω ⋅C ⋅V

⎛

⎞

in(peak)

θ = tan⁻¹

(11)

⎜

⎟

I_a

P = I_in(rms)⋅V_in(rms)⋅ 1− cos(2ωt) = I V

(

I_in(rms)⋅V_in(rms)

V_o

)

1− cos(2ωt)

)

⎝

⎠

I_a

C_in(max)

tan cos⁻¹(IDF)

(

)

I_D

(

)

ω ⋅V_{in(peak )}

2⋅V_o⋅I_o

ω ⋅V²

(13)

tan cos⁻¹(IDF) (12)

= I ⋅ 1− cos(2ωt)

(

)

in(peak _max)

I_D(avg)= I_O(1- cos(2ωt))

i_A

i_a

I_O

i_C

PFC

Circuit

V_a

I_O

V_A

ΔV_O

ωC_O

−

V_O

Input Filter

Figure 13. Diode Current and Output Voltage Waveform

i_A

I_o(max)

C_o(min)

≥

(14)

2π ⋅f_ac⋅ ΔV_o(max)

i_C

i_a

V_A

5) MOSFET and Diode Selection

The maximum MOSFET RMS current is obtained by Equa-

tion 15 and the conduction loss of the MOSFET is calculated

by Equation 16. When MOSFET turns on, the MOSFET cur-

rent rises from zero, so the turn-on loss is negligible. The

MOSFET turn-off loss and the MOSFET discharge loss are

obtained by Equations 17 and 18, respectively. The switch-

ing frequency of the critical conduction mode boost PFC

converter varies according to the line and load conditions.

Figure 11. Input Voltage and Current Displacement Due to

Input Filter Capacitance

Rev. 1.0.4 • 4/25/09

www.fairchildsemi.com

1...3 4 567 8 9...23

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