0195136047.pdf

16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 753

+

VG

Vs

Vs

t

t

vo

vG

R vo

Thyristor

(a)

− 1

1

−

+

+

−

−

+

VG

Vs

Vs

t

t

vo

t 1 T

t 1 T

vG

R vo

GTO

(b)

− 1

1

0

−

+

+

−

−

t 1 T

+

vB

Vs

Vs

t

t

vo

vB

R vo

(c)

1

0

−

+

+

−

−

t 1 T

t 1 T

Vs

t

t

vo

vGS

(d)

1

0

+

Vs

vo

vGS

R

D

S

G

−

+

+

−

−

Figure 16.1.4Output voltages and control characteristics of some commonly
used power switching devices.(a)Thyristor switch.(b)GTO switch.(c)Transistor
switch.(d)MOSFET switch.

Power Electronic Circuits

These circuits can be classified as follows:

• Diode rectifiers


• Ac–dc converters (controlled rectifiers)