Circuit Descriptions - Hitachi DV-C605U Service Manual

5. Circuit Descriptions

5-1 S.M.P.S.
5-1-1 Comparsion between Linear Power Supply and S.M.P.S.
5-1-1 (a) Linear
Common power
(Ex.120/220V 50/60Hz)
Waveform/Description
Vs
0
Vs
0
Vout
0
+
Vp
–
(Np)
Fig. 5-1 Linear Power Supply
t
Fig. 5-2
t
Fig. 5-3
t
Fig. 5-4
Vout
+
+
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.
Vreg
REGULATOR
5-1