?????????

admin

??????????? ????Word ?

14.3.2

ui

??14.02???????E?5V?ui?10sin?t????????? ???????????????uo ???? R

(b)

uu

(a)

????

(c) ?

14.02??14.3.2??

10

510 5 Uo (a) ???????

14.3.5 ??14.05????????????????VF ???????? ????1?VA??10V?VB?0V?

?2?VA??6V?VB??5.8V?

?3?VA?VB??5V?????????????????????

?????1?DA???? 1k

�10V =9V VF 1+9

V9 =

IDA =IR

A=1mA 9�103 R =9 VA 1kVB F 9k

?14.05

??14.3.5??

DB???IDB?0

?2??DA?DB

???????????????V

F

65.8+ =5.59V<5.8V? VF = 1 1

1+

+1 1 ??DB???????

6?5.59 A=0.41mA?I= 5.8?5.9 A=0.21mA?I= 5.59 DB R A=0.62mA IDA = 333 1�10 1�10

?3?DA?DB??????

55 VF4.47 V F = =4.47V,IR =A=0.53mA 31 1 1R 9�10 ++1 1 9 I0.53IDA =IDB =R=mA=0.26mA 2 2

14.4.2 ??????DZ1 ?????????5.5V ?8.5V????? ??0.5V??????0.5V?3V?6V?9V ?14V ??????????? ????????????????????????

????

?

?5V

??DZ2

?

? 9V

?

?

14.3.2

??1?????????E=5V?ui=10sin?tV????D????? ???????????????u0????

[?]

?1:??14.3.2?

(a)

(b) ui??????ui>E?D???ui <E?D???ui??????D? ?? ui??????ui>E?D???ui <E?D???ui??????D? ?? D????u0 =E?D????uo =ui? D????u0 =ui?D????u0 =E?

u0???????2(a)?(b)???

?2:??14.3.2?

?????????????????????

1 ??????????

1.5 ????????????

1.5.1

??1?,???????????????????????????? ?????????

? 1: ??1.5.1?

I1 = ?4A U1 = 140V U4 = ?

I2 = 6A U2 = ?90V U5 =

I3 = 10A U3 = 60V

30V

1 ????????????????????? 80V

2 ????????????????

3 ????????????????????????????? [?]:

2 ??1?2????3?4?5???? 3

P1 = U1I1 = 140 � (?4)W = ?560W P2 = U2I2 = (?90) � 6W = ?540W P3 = U3I3 = 60 � 10W = 600W P4 = U4I1 = (?80) � (?4)W = 320W P5 = U5I2 = 30 � 6W = 180W

? ? ? ? ? ? PE=

P1 + P2 = 1100W

?????? ???? 1.5.2

P = P3 + P4 + P5 = 1100W

??2????I1 = 3mA,I2 = 1mA.???????3????I3???? ??U3???????????????????????????

[?] ??????????????

? 2: ??1.5.2?

?I1 + I2 ? I3 = 0 ?3 + 1 ? I3 = 0

???I3 = ?2mA, I3???????????????? ????????????

U3 = (30 + 10 � 103 � 3 � 10?3 )V = 60V

??????????? 1 ??????????????

????3 80V?? 30V??

??I3 ?�+�???,????; ??I2 ?�+�????????? ??I1 ?�+�?????????

2 ?????????????? ????3

U3 ?I3???????P = U3 I3 = 60 � (?2) � 10?3W =

?120 � 10?3W ??????????

80V? ? U2 ?I2? ? ? ? ? ? ?P = U2I2 = 80 � 1 � 10?3W=

80 � 10?3W ?????????? 30V??

U1 ?I1??????P = U1I1 = 30 � 3 � 10?3 W = 90 �

10?3W ?????????? ??????? ????????? ??????:

2

PR1 = R1I1 = 10 � 3 2mW = 90mW 2 PR2 = R2I2 = 20 � 1 2mW = 20mW

??????:

PE = U2 I2 + U3 I3 = (80 + 120)mW = 200mW

???????????:

2 P = U1I1 + R1 I 2 1 + R2I2 = (90 + 90 + 20)mW = 200mW

???? 1.5.3

????????????PN= 200W ?????UN= 50V ???R0= 0.5??????R????????????1.5.1????? 1 ???????????????? 2 ???????????? 3 ??????????? [?]

(1) ????IN =

50 UPN 200 = A = 4A, ????R = N= = 12.5?

IN UN 50 4

(2) ??????U0 = E = UN + IN R0 = (50 + 4 � 0.5)V = 52V

E 52

= A = 104A (3) ??????IS =

R0 0.5 1.5.4

??????????????????30V ,???????2A???? ????????????????????

U0 ? UN= 0.1%),?????????

???U =

UN

[?] ??????U0 ??????E??????U0 ????U = E ? R0I ?? ??R0?

U0 ? UN

= ?U

UN U0 ? 30

= 0.1 %

30

???

U0 = E = 30.03V

??

U = E ? R0I

30= 30.03 ? R0 � 2

??

R0 = 0.015?

1.5.6

??110V ?8W ??????????380V ????????????? ??????????????

[?] ?????????????????IN ???RN ?

IN =

PN 8

= A = 0.073A N 110

UN 110

= ? = 1507? RN = IN 0.073

?380V ?????????110V ?????????

U ? UN380 ? 110? = 3700? R = =

IN 0.073 ?????

22

PN = RI N = 3700 � (0.073)W = 19.6W

????????3.7K ??20W ????

1.5.8

?3????????R??????????If ??????????? ????315?,??????220V ,?????????0.35 ? 0.7A????? ???????????????????:

(1) 1000??0.5A?(2) 200??1A?(3) 350??1A?

[?] ?R = 0?

?I = 0.35A?

I =

220

= 0.7A 315

220

R + 315 = = 630?

0.35

R = (630 ? 315) = 315?

???????350??1A?????

? 3: ??1.5.8?

1.5.11

?4????????????????????Rx????????? ???????????????????????Rx?????????? ???????Uo ????????????????Rx = 100??R1 = R2 =

R1Rx

200??R3 = 100??????= ????????Uo = 0??????

R3 R2

??????:

(1) Uo = +1mV ?(2) Uo = ?1mV ???????????Rx?Uo ???? ????????????U ???3V ?

[?] (1) Uo = +1mV

? 4: ??1.5.11?

?????????????:

?

Uab + Ubd + Uda = 0 Uab + Uo ? Uad = 0

U U

Rx + Uo ?= 0

Rx + R3 2

3Rx + 0.001 ? 1.5= 0 Rx + 100

??????????????

?????????????

??????

1?2

14.3.2 ??14.02??????? E?5V?ui?10sin?tV????????????????????????uo????

R

uo

-

?a?

?14.02

???(a) ?ui?5V?????D???uo?ui?ui?5V?????D???uo?5V?

5

?(d) ?ui?5V?????D???uo?5V?ui?5V?????D???uo?ui?

uo

-

(d)

?

14.3.6 ??14.06??E?10V,e?30sin?tV?????????????uD?

- uD-

+

?14.06

??????????????????

?e?E?0,?e??10V?????D???uD?e?E?

e?E?0,?e??10V?????D???uD?0?

?

14.4.1 ??14.07??E?20V,R1?900?,R2?1100???????DZ?????UZ?10V????

???IZM?8mA??????????????IZ?????IZM??????????

Z

?14.07

???IZ?IR1?IR2?

E?UZUZ?20?1010?

?????A?2.02mA?IZM, R1R2?9001100?

??IZ????IZM?????????R1????R2??????

14.5.4 ??14.08??????????????????????

.5k?

k?

?k?

?a?

?(b) ?14.08

?

(c)

????????????????UCE?0?ICS?

UCCI

?IBS?CS?IB?IBS? RC?

?????????????IB?0?IC?0?UCE?UCC ? ??????????? (a) ICS?

UCCI1212

?A?12mA?IBS?CS?mA?0.24mA? RC1000?50

IB?

6

A?0.12mA?IBS????????????

50?103

(b)

ICS

UCC12??A?20mA?IBS?ICS?20mA?0.2mA?

RC1500?40

12

A?0.255mA?IBS????????????

47?103

IB?

(c) VB?0?IB?0????????????

??????3?4?5?6

15.2.1 ?????????15.01?a??????UCC?12V?RC?3k?,RB?240k?,??????40?

?1?????????????

IB,IC,UCE??2????????????15.01?b??????

????????????????3?????(ui?0)C1?C2???????????????

IC/+

?A

?a?

uo-

CE/V

(b)

?15.01

???(1) ?????????????

UCC

RB

IB?

UCC12

?A?0.05?10-3A?50?A

3RB240?10

IC??IB?40?0.05mA?2mA UCE?UCC?ICRC?12?2?10

(2) ????????

UCE?UCC?RCIC ??? IC?0? UCE?UCC?12V UCE?0?IC?

??

?3

???3?10??V?6V

3

UCC12-3

?A?4?10A?4mA 3RC3?10

??????????????????????

IB?

UCC12

?A?0.05?10-3A?50?A 3

RB240?10

?????????Q

IC/?A

CE/V

(3) ?????UC1?UBE?0.7V?UC2?UCE?6V?C1?C2????????

+

uo-

15.2.2 ????????UCE?3V????????RB???????RB??IC?1.5mA?RB???

?????????????????? ????UCE?3V??IC?

UCC?UCE12?3

?A?3mA

3

RC3?10


??????????????????
?????http://www.850500.com/news/6154.html
?????,??!