Panasonic DF-1100 Service Manual page 234

Panasonic DF–1100
The value of output voltage is
Eo=d/(1-d)*Ei
d=Ton/Ts
Equivalent circuit model for the RCC.
SW
Ei
(Q102)
VL
T101
VL
Eo
Ts
(1-d)Ts
6–38
Ton : ON TIME OF Q102
Ts : PERIOD OF OSCILLATION
D(D203)
Eo
L C
RL
Ei
T
dTs
IL
dTs
In the equivalent circuit ; When SW is on, current
flows
SW L
When SW is off, current flows
L D RL
The value of inductance increase current between
on period. (d*Ts)
IL=Ei/L*d*Ts . . . . . . . . . . . . . . . . . .(1)
The value of inductance decrease current between
off period. ((1-d)*Ts) . . . . . . . . . . . . . . . .(2)
From equation (1) and (2),
Eo=d/(1-d)*Ei