, ().
:
1) U .max ( );
2) R ;
3) f ;
4) ;
5) U .
. , (T min = +15; max = +25). .
:
1) ;
2) ;
3) R ;
4) R e;
5) R 1 i R 2, ;
6) ;
7) ;
8) K U.
.
1. , :
) U . ≥ (1,1÷1,3) U , U . , ;
) > 2 .m = 2 U .m / R , I .m ; , .
:
1) - .
2) β min β max. α .. β = α / (1 α) ( .min ≥ .).
3) -108, -109, -20, -21, -25, -40, -41, -42, -111, -113 .
2. , () . .
14 : . 0 () . 1, U . . 0 0 U 0( , U = 0).
0 = (1,05÷1,2) ≈ (1,05÷1,2) .m.
U 0 = U .m + U = U .m + U ,
U U . U < U , , . U = 0,5÷1,0 .
3. R i R e.
R = R + R e R = U / I, I , . 4, .
|
|
R = (0,15÷0,25) R ,
R = R /(1,15÷1,25); R e = R R .
4. .max U .max, U .max. β min, .max = I .max = I .max / β min, .max , ' .max ≈ 1÷2 , ' .min ≈ 0,05 .
.m .min 2 U .m.
5. R ( R 1i R 2):
6. R 1i R 2. 䳿
R 12 ≥ (8÷12) R ≈, R 12= R 1 R 2/(R 1 + R 2).:
7. : , β max .
S .
8. :
, R . , . R . ≥ R , R ≈ R + R .
9. .
10. :
.
.
. (. ):
U .m = 4 ; R = 500 ; f = 100 ; = 1,2; U = 12 .
.
1. ) U . ≥ 1,2 U = 1,212 = 14,4 ;
) > 2 .m = 2 U .m / R = 24/500 = 0,016 = 16 .
-42, = 30 , U . = 15 , β min = 30, β max = 50, .min = 25 .
2. () ( 0),
0 = 1,2 .m = 1,28 = 9,6 ;
U 0 = U .m + U = 4 + 1 = 5 .
( 1) U = U = 12 , = 0.
.
3. = 16,5 ,
R = U / I = 12/(16,5103) = 727 .
,
R = R /1,2 = 727/1,2 = 606 ;. R e = R R = 727 606 = 121 .
4. ( ) 42 β min = 30. ( U = 1 ) I .max = 15 :
.max = .max = I .max / β min = 15/30 = 0,5 ,
m = (I .max ' .min) / 2 = (0,5 0,05) / 2 = 0,225 .
( ):
U .min = 0,11 ; U .max = 0,33
2 U .m = U .max U .min = 0,33 0,11 = 0,22 .
5. :
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6. R 1 R 2 R 12≥ 8 R ≈ = 8489 ≈ 4000 . :
7. ,
, .
8. :
= 3,0 .
9.
䒺 > 132 . . = (10÷30) . = 20 .
10.
U = U .m / U .m = 4/0,11 = 36,4.