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Circuit Descriptions
Advantages and disadvantages of linear power supply
1) Advantages : Little noise because the output waveform
of transformer is sine wave.
2) Disadvantages :
ΠAdditional margin is required because Vs is chan-
ged (depending on power source). (The regulator
loss is caused by margin design).
´ Greater core size and condensor capacity are ne-
eded, because the transformer works on a single
power frequency.
6-1-1 (b) S.M.P.S. (Pulse width modulation method)
+
Vin
ON/OFF Control
Terms
1) 1st : Common power input to 1st winding.
2) 2nd : Circuit followings output winding of transformer.
3) f (Frequency) : Switching frequency (T : Switching cycle)
4) Duty : (Ton/T) x 100
6-2
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Transformer
(Np)
(Ns)
+
+
(Vp)
–
–
Switch
+
Vs switch
–
I switch
Fig. 6-6
Change by common power
v
Vout
Vreg
0
Regulator loss
Fig. 6-5
Vout
(Vs)
+
t
REGULATOR
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