Samsung DVD-812 Service Manual page 51

Circuit Descriptions
5-2 Power (Free Voltage)
5-2-1 Comparsion between Linear Power Supply and S.M.P.S.
5-2-1 (a) Linear
Common power
(Ex.110~240V 50/60Hz)
◆ Waveform/Description
Vs
0
Vs
0
Vout
0
5-6
+
Vp
–
(Np)
Fig. 5-11 Linear Power Supply
t
Fig. 5-12
t
Fig. 5-13
t
Fig. 5-14
+
+
Vs
–
(Ns)
Input : Common power to transformer (Vp).
The output Vs of transformer is determined by the ratio
of 1st Np and 2nd Ns.
Vs = (Ns/Np) x Vp
Vout is output (DC) by diode and condensor.
Vout
REGULATOR
Samsung Electronics
Vreg