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(1)

26

3

3

3

3

3

3-1

3-2 =150V

rms

V Vav PIV

V 95.4

= av

V , PIV = 300V

V 300 150

2

2 = × =

= rms

m V

V

V 4 . 5 9 300 318 .

0 × =

≅ = ∴

π

m av

V

V PIV = Vm = 300V

3-4 : 1:2

2

1 N =

N

100V (1) Vav (2) Vrms (3)

PIV

V 6 . 63

= av

V , Vrms = 70.7V, PIV = 200V

(1) 200V

1 2 100 2

2m = Vm = × =

V

V 6 . 63 100 636 . 0

2 × =

= πm

av

V V

(2) 0.707 100 70.7V

2 ≅ × =

= m

rms

V V

(3) PIV = V2m = 2Vm = 200V

3-6 : 1:2

2

1 N =

N

100V (1) Vav (2) Vrms (3)

PIV

V 2 . 127

= av

V , Vrms = 141.4V, PIV = 200V

(1) 200V

1 2 100 2

2m = Vm = × =

V

V 2 . 127 200

636 . 0 2

= × ≅

= π

m av

(2)

( A )1.

(A) (B) (C) (D)

( B )2.

(A) (B) (C) (D)

( C )3.

(A) (B) (C) (D)

( D )4.

(A) (B) (C) (D)

( B )5. 60Hz

(A)30Hz (B)60Hz (C)120Hz (D)240Hz

fo fi

( D )6. 50V

(A)50V (B)70.7V (C)78.6V (D)100V V 100 5

. 0

50 5

.

0 = =

=

= rms

m P

V V V

( A )7. 100V 5:1

(A)6.36V (B)12.72V (C)14.14V (D)28.28V V

20 100 5 1

= × =

m

V

V 36 . 6 20 318 . 0 318

.

0 = × =

m

av V

V

(2) 0.707 200 141.4V

2 ≅ × =

= m

rms

V V

(3) PIV = V2m = Vm = 200V

(3)

28

( D )8. 50V

(A)70.7V (B)78.6V (C)141.4V (D)157.2V

V 6 . 78 636 . 0

50 636

.

0 = =

av m

V V

PIV PIV = 2Vm = 2×78.6 = 157.2V

( A )9. 50V

(A)70.7V (B)78.6V (C)141.4V (D)157.2V V

7 . 70 707 . 0

50 707

.

0 = =

rms m

V V

PIV PIV = Vm = 70.7V

3-2

3-7 Vdc 40V

) (rms r

V 2V r%

% 5 % = r

V 2

) (rms = r

V Vdc = 40V

% 5 % 100 40

2 % 100

% = ( ) × = × =

dc rms r

V V r

3-8 r%

% 48 % = r

dc

V Vrms

m m

av

dc V

V V

V = = 2 ≅ 0.636 π

m m

eff

rms V

V V

V 0.707

2 ≅ =

=

0

o

v

t m

V

m

dc V

V ≅0.636

) (P P r

(4)

) (rms r V m m m dc rms rms

r V V V V V

V ( ) = 2 − 2 ≅ (0.707 )2 −(0.636 )2 ≅ 0.308

% 48 % 100 48 . 0 % 100 636 . 0 308 . 0 % 100 % = ( ) × ≅ × ≅ × ≅ ∴ m m dc rms r V V V V r

3-9 200V (1)

o v (2) PIV V 20 = o

v , PIV = 40V

(1) 20V

10 1 200 1 2 1

2 = ⋅ = × =

= = N N V V V

vo m m m

(2) PIV = Vm +vC = Vm +Vm = 2×20 = 40V

3-10 (1)

C (2) Vr(rms)

F 240µ =

C , Vr(rms) = 0.141V

(1) 240 F

1 4 . 2 100 1 % 100 4 . 2

% ∴ = µ

× = ⇒ × = C C C R r L

(2) VdcVo(m) = 10 2V

V 141 . 0 2 1 . 0 ) V 2 10 ( 240 1 4 . 2 4 . 2 ) ( = ≅ × = = dc L rms r V C R V 3-11 2

C 10µF r′%

% 45 . 9 % = ′ r Ω ≅ × × × =

= 133

) 10 10 ( 120 2 1 2 1 6 2 2 π πfC

XC V 36 . 9 133 50 133 10 2 2 2 2 2 2 ) ( ) ( = + × = + ⋅ = ′ C C rms r rms r X R X V V % 45 . 9 % 100 99 36 . 9 % 100 % ( ) × = × = ′ ′ = ′ dc rms r V V r 3-12 2

C 10µF L 1H

(5)

30

( B )1.

(A) (B) (C) (D)

( B )2.

(A) (B) (C) (D)

( B )3.

(A) (B) (C) (D)

C o v

v =

( B )4. 20V 4V rms

(A)10% (B)20% (C)14.14% (D)28.28% %

20 % 100 20

4 % 100

% = ( ) × = × =

dc rms r

V V r

( B )5. RC 2V

20V (A)5% (B)10% (C)15% (D)20%

% 10 % 100 20

2 % 100

% = ( ) × = × =

dc rms r

V V r

( A )6. π

(A) (B) L (C) C1

(D) C2

(1)

(2) L C1 C2

Ω ≅

× × × =

= 133

) 10 10 ( 120 2

1 2

1

6 2

2

π π fC

XC

Ω ≅

× × =

= 2π fL 2π 120 1 754

XL

V 14 . 2 133 754

133 10

2 2 )

( )

( =

− × = −

⋅ =

C L

C rms

r rms r

X X

X V

V

% 14 . 2 % 100 100

14 . 2 % 100

% ( ) × = × =

′ ′ = ′

dc rms r

V V r

(6)

3-3

3-13 =60Hz

i

f Vm =100V

o

f PIV

Hz 120

= o

f , PIVD1 = PIVD2 = PIVD3 = 200V

(1) C2 C3

Hz 120 60

2

2 = × =

= i

o f

f

(2) PIVD1 = vC1+Vm = 2Vm = 2×100 = 200V V 200 100

2 2

1 2

2 = C + mC = m = × =

D v V v V

PIV

V 200 100

2 2

3

3 = C + m = m = × =

D v V V

PIV

( C )7. (1) (A)vo vi

(B) (C) RL (D)vo

C

C

X RL

( B )8. 5kΩ 0.005

C (A)48µF (B)96µF (C)192µF (D)240µF

% 100 4 . 2

% = ×

C R r

L

F 96 2400

25 5

4 . 2 005 .

0 ⇒ = ∴ = µ

× =

C C

C

L

R

+

C

+

o

v t

V vi= msinω

(7)

32

( D )1. 4Vm Vm

(A)2 2

(B)2 4

(C)4 2

(D)4 4

4

( C )2. (1) D1 D2

(A)141V (B)−141V (C)200V (D)−200V

1

C

1

D C2 vo

2

D

+

V 377 sin

100 t

vi=

(1)

V 200 100

2

2 = × =

= m

o V

v

( A )3. fo

(A)60Hz (B)120Hz (C)377Hz (D)754Hz

o i f

f =

Hz 60 2

377

2 = =

= =

π π

ω

i

o f

f

( A )4. C1 vC1

(A)100V (B)141V (C)200V (D)282V

V 100

1 = m =

C V

v

( C )5. D1 PIV

(A)100V (B)141V (C)200V (D)282V

V 200 100

2

2 = × =

= Vm

(8)

3-4

3-14

V sin

6 t

vi = ω vo

V 3 . 5 V

0 ≤ vo

V 6 =

m

V , VD = 0.7V

) (

V

0 ≤ voVmVD

V 3 . 5 V

0 ≤ ≤

vo

3-15

V 6

= m

V V

1

1 =

V V2 =2V

o

v

V 7 V

2 ≤ vo

(1) vi +V1 > V2 D vo = vi +V1

(2) vi +V1 < V2 D vo = V2

1

2 v V V

Vom +

V 7 V

2 ≤ ≤

vo

3-16

V 6 =

m

V

V 1

1 =

V V2 =2V

o

v

V 5 V

2 ≤ ≤

vo

(1) viV1 > −V2 D vo = viV1 (2) viV1 < −V2 D vo = −V2

1

2 v V V

Vom

V 5 V

2 ≤ ≤

vo

o

v

.3V 5

t

0

+

+

R i

v vo

D

+ −V1 i

v

0 t

m

V

m

V

− −

+ 2

V

+

+

R i

v vo

D

1

V

i

v

0 t

m

V

m

V

V2

+ −

(9)

34 o v .3V 1 V 6 t 0 o v V 7 . 2 − V 6 t 0 o v V 2 V 4 t 0 o v V 7 . 2 V 7 . 4 − t 0 o v V 7 . 0 V 6 t 0 3-17 V sin 6 t

vi = ω vo

V 6 V

7 .

0 ≤ ≤

vo

V 6

= m

V , VD = 0.7V

m o

D v V

V ≤ ≤

− V 6 V 7 .

0 ≤ ≤

vo

3-18 v 6sin tV

i = ω

V 2

1 =

V vo

V 6 V

3 .

1 ≤ vo

V 6

= m

V , V1 = 2V, VD = 0.7V

m o

D v V

V

V1 − ≤ ≤

V 6 V

3 .

1 ≤ ≤

vo

3-19 v 6sin tV

i = ω

V 2

1 =

V vo

V 6 V

7 .

2 ≤ ≤

vo

V 6 =

m

V , V1 = 2V, VD = 0.7V

m o

D v V

V

V − ≤ ≤

− 1 V 6 V 7 .

2 ≤ ≤

vo

3-20

2

V vo

V 4 V

2 ≤ vo

2

V

1

V V2 V2 ≤ voV1

V 4 V

2 ≤ ≤

vo

3-21 o v V 7 . 2 V 7 .

4 ≤ ≤

vo

V 7 . 2 V 7 . 4 V ) 7 . 0 2 ( V ) 7 . 0 4 ( ) ( )

( 1 2 2 1

(10)

( C )1. (A) (B) (C) (D)

( B )2. (A)

(B) (C)

(D)

( A )3. (1) vi =4sinωtV

(A) (B) (C) (D)

(1) vi −2V > 0 ⇒ D vo = 0V (2) vi −2V < 0 ⇒ D

V 6 2 sin 4

1 = − ≥ −

= v V t

vo i ω

0 V

6 ≤ ≤

vo

o

v

t 0

V 2

V 6

o

v

t

0 V 2

V 4

o

v

t 0

V 2

V 4

o

v

t

0 V 2

V 6

( D )4. (2) vi =4sinωtV

(A) (B) (C) (D)

o

v

t 0

V 2

o

v

t

0 V 2

V 4

o

v

t 0

V 2

V 4

o

v

t

0 V 2

V 6

V 2

+

+

R i

v vo

D

+ −

(1)

+

+

R i

v vo

+

−2V D

(2)

(11)

36

(1) vi +2V > 0 ⇒ D

V 6 2 sin 4

1 = + ≤

+

= v V t

vo i ω

(2) vi +2V < 0 ⇒ D vo = 0V V

6 0 ≤ vo

( B )5. (3) vi =4sinωtV

(A) (B) (C) (D)

(1) vi > 2V ⇒ D vo = V1 = 2V

(2) vi < 2V ⇒ D

V 4 sin

4 ≥ −

=

= v t

vo i ω

V 2 V

4 ≤ ≤

vo

o

v

t 0

V 2

V 6

o

v

t

0 V 2

V 4

o

v

t 0

V 2

V 4

o

v

t

0 V 2

V 6

( C )6. vo R

(A) (B) (C) (D)

D V

sin

2 t

vi′ = ω D

V sin

2 t

v

vo = i′ = ω

V 2 V

2 ≤ ≤

vo

o

v

t

0 V 2

V 4

o

v

t

0 V 2

V 4

o

v

t

0 V 2

V 2

o

v

t

0 V 4

V 4

V 2

+

+

R

i

v vo

D

+ −

(3)

V 2

+

+

R

i

v vo

D

+ −

R

i

(12)

( C )7. (4) vi =4sinωtV

(A) (B) (C) (D)

(1) vi > 2V ⇒ D1 D2 vo = 2V

(2) vi < 2V ⇒ D1 D2 vo = −2V

(3) −2V < vo < 2V ⇒ D1,D2

V sin

4 t

v

vo = i = ω

V 2 V

2 ≤ ≤

vo

o

v

t

0 V 2

V 4

o

v

t 0

V 2

V 4

o

v

t

0 V 2

V 4

o

v

t

0 V 2

V 2

+

+

R

i

v vo

1

D

+ −

2

D

+−

V

2 2V

(4)

3-5

3-22

1

V vo

V 6 V

2 ≤ ≤

vo

1

V

1

1 2

0−VvoVmV

2 4 2 2 ≤ ≤ × −

vo

V 6 V

2 ≤ ≤

vo

3-23

1

V vo

V 2 V

10 ≤ ≤ −

vo

1

V

1

1 0

2VmVvo ≤ −V

2 2

4

2× − ≤ ≤ − −

vo

V 2 10 ≤ ≤ −

⇒ V vo

o

v

0 t

6V

2V

o

v

V 10

V 2

(13)

38

( B )1. (A) (B) (C) (D)

( A )2. clamping circuit

(A) (B) (C) (D)

( A )3. (1) vi =±3V

(A) (B) (C) (D)

V 2 V

8

2 2

3 2

2 1 1

− ≤ ≤ − ⇒

− ≤ ≤ − × − ⇒

− ≤ ≤ − −

o o o m

v v

V v

V V

o

v

8V

0 t

2V

o

v

4V

0 t

2V

o

v

4V

0 t

2V

o

v

V 8

0 t

2V

( C )4. (2) vi =±3V

(A) (B) (C) (D)

V 4 V

2

2 3 2 2

2 1

1

≤ ≤ − ⇒

− × ≤ ≤ − ⇒

− ≤ ≤ −

o o

m o

v v

V V v

V

i

v R

+

o

v C

D

+

2V

+

(1)

i

v R

+

o

v C

D

+

2V

+

(2)

o

v

8V

0 t

2V

o

v

4V

0 t

2V

o

v

4V

0 t

2V

o

v

V 8

0 t

2V

(14)

( B )5. (3) vi =±3V

(A) (B) (C) (D)

V 2 V

4

2 2

3 2

2 1 1

≤ ≤ − ⇒

≤ ≤ + × − ⇒

≤ ≤ + −

o o o m

v v

V v V V

( D )6. (4) vi =±3V

(A) (B) (C) (D)

V 8 V

2

2 3 2 2

2 1

1

≤ ≤ ⇒

+ × ≤ ≤ ⇒

+ ≤ ≤

o o

m o

v v

V V v

V

( A )7. vo (A)5V (B)−5V (C)1V (D)−1V

V 5 2

V 2 V

8 + =

=

ac

V

o

v

8V

0 t

2V

o

v

4V

0 t

2V

o

v

4V

0 t

2V

o

v

V 8

0 t

2V

o

v

8V

0 t

2V

o

v

4V

0 t

2V

o

v

4V

0 t

2V

o

v

V 8

0 t

2V

( A )1.

(A) (B)

(C) (D) 3-1

i

v R

+

o

v C

D

+

−2V

+

(3)

i

v R

+

o

v C

D

+

−2V

+

(15)

40

( D )3. PIV

(A)20V (B)20 2V (C)40V (D)40 2V 3-1

V 2 40 10

1 2 200 2

2 = × × =

= Vm

PIV

( B )4. Vrms 5V

PIV (A)6.36V (B)7.07V (C)9V (D)14.14V 3-1

V 07 . 7 707 . 0

5 707

.

0 = =

= rms

m

V V

PIV

( C )5. (2) vi=20 2sin377tV

(A) vo 18V (B) vo 20V

(C) PIV 20V (D) vo 120Hz 3-1

(1) Vdc = Vav = 0.9Vrms = 0.9×20V = 18V

(2) 20 2V 20V

2 1 2

1

= ×

=

= m

rms V

V

( D )2. (1) D1 D2 vi(t)=200 2sin377tV

3 2 1:N :N

N =10:1:1 vo

(A) 2 2π

(B) 2

π

(C) 2 π

(D) 2 2

π

3-1

V 20 2 1 10

2 200

= × =

rms

V 2 40 2 V

10 2 200

π

π =

× =

av

V

2 2 2 40

20 π

π = =

av rms

V V

(2)

L

R

i

v

o

v

+

o

v

− +

1

D

2

D

R 1

N

2

N

3

N

+

) (t vi

(16)

(3) D PIV Vm = 20 2V

(4) 120Hz

2 377 2

2 = × ≅

=

π

i

o f

f

( C )6. (3) vi =120 2sin377tV

L

R

(A)15V (B)30V (C)15 2V (D)30 2V 3-2

V 2 15 2 1 4 1 V 2

120 × × =

=

m

dc V

V

(3)

L

R

+

o

v

2

D

1

D

+

i

v

1 4:

L

I

+

m

V

+

m

V

( C )7. PIV

(A) V

2 2 15

(B)15 2V (C)30 2V (D)60 2V 3-2

V 2 30 2 4

1 2 120 2

2 =

× × ×

=

= Vm

PIV

( A )8. (4) D ripple factor

(A) (B)

(C) (D) 3-2

(A) % = ( ) ×100%

dc rms r

V V

r vi Vdc

(B)(D) τ = RLC

(C) Vr(rms)

( C )9. (A)

(B) 1.21

(C)

(D) XL RL 3-2

R

+

o

v C

D

i

v

(17)

42

1

D vo

+

m

V

+

1

C D2

2

C

(5)

( C )10. (5) vo

(A)Vm (B)−Vm (C)2Vm (D)−2Vm 3-3

1

C D2 C2

m m

C

o v V V

v = 1+ = 2

( C )11. (6)

(A)C2 Vm (B)C3 Vm

(C)D1 Vm (D) 3-3

(1) VC1 = VC3 = Vm VC2 = 2Vm

(2) PIVD1 = PIVD2 = PIVD3 = 2Vm

(3)

( B )12. (7) 0.7V vi =5sinωtV

( A ) −5V ≤ vo ≤ −0.7V ( B ) −5V ≤ vo ≤ 0.7V ( C )

V 5 V

7 .

0 ≤ ≤

vo (D)0.7V ≤ vo ≤ 5V 3-4

(1) vi ≥ 0.7V ⇒ D vo = 0.7V

(2) vi ≤ 0.7V ⇒ D vo = vi = 5sinωtV V

7 . 0 V

5 ≤ ≤

vo

1

D

o

v

+

V

sin t

V vi = m ω

+

1

C

2

D C2

3

C

3

D

(6)

i

v

R +

o

v

D

+

(7)

( B )13. (8) vi >5V vo =

(A)vi −5V (B)5V (C)vi (D)vi +5V 3-4

V 5

> i

v

V 5 = ∴ vo

i

v

R

+

o

v

5V

+ −

+

(18)

( A )14. (9) vi=10sinωtV

o

v (A)5V (B)10V (C)15V (D)20V 3-4

(1) vi > 5V ⇒ D vo = vi −5V = 10sinωtV−5V ≤ 5V

(2) vi < 5V ⇒ D vo = 0V

V 5 V

0 ≤ vo

( D )15. ( 1 0 ) vi=12sinωtV VZ1=6V

V 15

2 = Z

V 0V vo

(A) (B)

(C) (D) 3-4

V 6

1 =

Z

V

Q , VZ2 = 15V

(1) vi

1

V 12 V

0 ≤ vi ≤ ⇒ DZ DZ2

V 12 V

0 V sin

12 ⇒ ≤ ≤

= =

vo vi ωt vo

(2) vi

2

V 0 V

6 ≤ vi ≤ ⇒ DZ

DZ1

V 0 V

6 V

sin

12 ⇒ − ≤ ≤

= =

vo vi ωt vo

2

V 6 V

12 ≤ vi ≤ − ⇒ DZ

DZ1

V 6

1 =

=

vo VZ

V 12 V

6 ≤ ≤

vo

o

v

t 0

12V 6V

o

v

t

0 12V 6V

o

v

t

0 12V

6V

o

v

t

0 12V 6V

i

v 1kΩ

+

o

v

5V

+ − +

(9)

i

v

k 1

+

o

v

1 Z

V

2 Z

V

+

(19)

44

( C )16. (A) (B)

(C) (D) 3-5

( C )17. (11) vo (A) (B)

i

v (C)R (D) PIV 3-5

R τ =RC

( D )18. (12) vi ±5V vo

(A) (B) (C) (D) 3-5

(1) vi = 5V D CvC = viV1 = 5−2 = 3V

V 2 3 5− = =

− =

vo vi vC

(2) vi = −5V DvC ≅ 3V V 8 3 5− = −

− = − =

vo vi vC

( B )19. 2 D1 D2

(A) (B)

(C) (D)D2 PIV 3-1

1

D D2

2

D

rms

rms V

V

2 1 V 2 10 2 1 10

2 200

= =

× =

( D )20. 5

(A) vo (B) vo 10V

(C) PIV 20V (D) vo 60Hz 3-1

t

o

v

0 2V

8V

+

t

o

v

0 2V 12V

+ t

o

v 0 2V

12V

t

o

v

0 2V

8V

t

i

v

0 2V

+ f =1kHz

8V −

t

o

v

0

10V −

i

v R

+

o

v C

D +

(11)

i

v R

+

o

v C

2V + −

+

(20)

(1) Vdc = Vav = 0.45Vrms = 0.45×20V = 9V

(2) 10 2V

2 1

=

= m

rms V

V

(3) D PIV Vm = 20 2V (4) fo = fi = 60Hz

( C )21. v(t)=50+2 2sin377tV v(t) r%

(A)2% (B)2.8% (C)4% (D)5.6% 3-2

V 2 2

2 2 2

) ( )

( = = =

m r rms r

V

V Vdc = Vav = 50V

% 4 % 100 50

2 % 100

% = ( ) × = × =

dc rms r

V V r

( D )22. (13) π

(A)

(B) L (C) C1

2

C (D) RL 3-2

L

R

( B )23. 1kΩ

0.002 C

(A)120µF (B)1200µF (C)240µF (D)2400µF 3-2

F 1200 1

4 . 2 1000

2 %

100 4 . 2

% ∴ = µ

× = ⇒

×

= C

C C

R r

L

( A )24. (14) s

(A) (B)

(C) (D) 3-4

L

R

C1 C2

L

(13)

1 = s

o

v

i

v

V 5 V 5

1 = s

o

v

i

v

V 5 − V 5 −

1 = s

o

v

i

v

V 5 − V 5 −

=

o

v

i

v

V 5

V 5

i

v 1kΩ

+

o

v

5V+

+

(21)

46

V 9

t

V 9 −

o

v

V 9

t

V 9 −

o

v

V 9

t

V 9 −

o

v

V 15

t

V 15 −

o

v

(15)

o

v

+

R ZD

V 15

t

V 15

V 6

=

Z

V

D i

V

i

v (1) vi > 5V vo = vi

(2) vi < 5V vo = 5V

( B )25. (15) vi ZD Zener Diode

Z

V 6 D R vo

(A) (B)

(C) (D) 3-4

(1) D

+

R

ZD D

i

v vo

(2)

0

< <

VZ vi ZD vo = 0

0

< − < Z

i V

v ZD D

+

R

ZD

V 6

=

Z

V

D

i

v

− +

o

v

0

=

vo

V 6

+ =

(22)

i

v

0 t

V 8

V 8

D

i

v vo

k

3 3kΩ

+

+

(16)

( A )26. (16) vi vo

(A)vo (B) (C) (D) 3-4

t

0 V 4

V 8

o

v

t

0 V 8

V 4

o

v

t

0

V 8

o

v

t

0 V 8

(1) vi > 0 D vo vi vi 2 1 )

k 3 k 3

k 3

( =

Ω + Ω

Ω =

(2) vi < 0 D = vo = vi o

v −8V~4V

(17)

i

v

+

− 1

D D2

V sin

10 ωt

k 1

8V

+

2V

k 1

+

o

v

( D )27. (17) 10sinωtV

o

v

(A) (B)

(C) (D) 3-4

o

v

t

0 V 8

V 2

o

v

t

0 0V 1

V 2

o

v

t

0 V 4

V 2

o

v

t

0 V 5

V 2

(1) vi < 4V D1 ON D2 OFF ⇒ vo = 2V

(2) 4V < vi < 16V D1 OFF D2 OFF vo vi vi 2 1 )

1k 1k

k 1

( =

Ω + Ω

Ω =

(3) vi > 16V D1 OFF D2 ON ⇒ vo = 8V

(23)

48

( D )30. (20) 10sinωtV vo

(A)(2+10sinωt)V (B)(8+10sinωt)V

(C)(−2−10sinωt)V (D)(−8+10sinωt)V 3-5

V sin 10

8 ωt

vo = − +

i

v +

D

C

2V

R vo

(20)

o

v

t

V 2

8V

8V 1

( A )28. (18) vo(t)

(A)3V (B)−3V (C)7V (D)−7V 3-4

) (t vo

+

) (t vi

R

+

V

7 −

+ 3V− +

1

D D2

+

t

) (t vi

V 10

V 10

(18)

) (t

vi 10V D1 D2

V 3 ) (t = vo

( A )29. (19) vi(t) 100sin(377t)V )

(t vo

(A)D2 (B)D1 (C)R (D)D1 D2 3-4

(1) D1 vo = 30V

(2) D2 vo = vi

R

1

D

V 30

1=

V

2

D

V 50

2=

V

+ −

) (t

vi vo(t)

+

+

+

) (t vo

t

V 100

V 30

(24)

1. (21) Vo(P)

PIV 3-1

(1)

V 240 120

1 2

1 1 2

2m = Vm = × =

N N V

V 240

2 )

(P = m =

o V

V

(2) PIV

V 240

)

( =

= Vo P

PIV

2. (22) 100V

) (rms o

V PIV 3-1

(1)

V 20 100 5 1

) ( 1 1 2 ) (

2rms = V rms = × =

N N V

V 10 20 2 1 2

1

) ( 2 )

(rms = rms = × =

o V

V

(2) Vm = 2V2(rms) = 2×10 = 10 2V PIV PIV = 2Vm = 2×10 2 = 20 2 V

(21)

L

R vo

V sin 120 ωt

2 1:

+

L

R

o

v

i

v

1

D

2

D

+

−1 v

+

+

2

v

(23) (22)

L

R vo

1 5:

i

v

3. (23) v1 = v2 v1=10sinωtV D1 D2 o

v 3-1

V 36 . 6 636 . 0 V 10 2

)

(dc = − m×π ≅ − × = −

o V

(25)

50

4. (24) r%

73 . 1

3= 3-2

V 577 . 0 3 2

9 11 3

) ( )

( ≅

− =

= r m

rms r

V V

V 10 2

9 11

= + = dc

V

% 77 . 5 % 100 10

577 . 0 % 100

% = ( ) × = × =

dc rms r

V V r

o

v

t

V 9 1V 1

(24) (25)

i

v

t

0 5V

i

v R

+

o

v

3V+

+

D

6. (26) D1 D2 vi=100sin377tV vo 3-4

i

v 2 vo

D

+ −

20V

+

− 15V

1

D

(26)

o

v

t

0 5V 3V

5. (25) D vi duty cycle 50%

o

v 3-4

V 4 2

3 5

= + = av

(26)

(1) vi D2 V 20 V

0 ≤ viD1 vo = vi

V 20 V

0 ≤ ≤

vo

V 100 V

20 ≤ viD1 vo = 20V (2) vi D1

V 0 V

15 ≤ ≤

vi D2 vo = vi

V 0 V

15 ≤ ≤

vo

V 15 V

100 ≤ ≤ −

vi D2 vo = −15V

V 35 ) 15 ( 20

)

( = − − =

voPP

7. (27) RC

10 R 3-5

t

i

v

0

5V

5V

+ f =500Hz

2

T

2

T

i

v vo

F 1 .

0 µ

R D

(27)

ms 2 500

1

1 = =

= f T

Ω =

× × × = × = ∴

=

− −

k 200 10

1 . 0

10 2 10 10

10

6 3

C T R

T RC

参照

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