close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2131193

код для вставки
Sept. 27, 1938.
K. SCHLESINGER
TRANSFORMER COUPLING FOR TELEVISION AMPLIFIERS
Filed June 4, 1935
2,131,193
2,131,193.v
Patented Sept. 27, 1938
UNITED STATES PATENT
2,131,193
TRANSFORMER COUPLING FORTT‘ELEVI
,
SION AMPLIFIERS
Kurt Schlesinger, Berlin, Germany, assignor to ,
Radioaktiengesellschaft D‘. S. Loewe, Berlin
Steglitz, Germany
Application June 4, 1935, Serial No.‘ 24,901
In Germany June 5, 1934
.
1
(Cl. 178-44)
The use of choke coils for ‘coupling ampli?er at a longer natural wave, §viz., a natural?wave "
8 Claims.
stages, more particularly in the case of carrier
which is longer to theextent of _ _
frequency amplification,’v is already known for
1/5.
This ‘shows that in the case ofa television‘
television purposes. The selection of the natural
5 frequency of the oscillator choke may be in reso
nance with the unmodulated carrier wave, where
,
pli?er with ‘?xed carrier frequency.
by the ratio between the free oscillations and
the forced Oscillations requires to be made suf
?ciently small by means of a relatively strong
former coils‘ than on‘an equivalent choke.‘ In;
ever, as set forthin my previous application Ser.
No. 749,511, of October'23rd, 1934 may also be
detuned as compared with the unmodulated car
this
will be
case,
twice
however,
as greatthe.
as transmission
inthe case of
resistance
a choke
coupling, and there is accordingly’ received in
the extreme case a translation of ‘potential which
rier frequency, whereby, generally speaking, a
15 small parallel damping of the coil is then per
missible.
_
Y
The subject matter of the present invention
concerns certain features of design in respect of
a transformer coupling in television highv fre
20
more windings can be wound onthe twotran's
parallel damping. The natural frequency, how
quency ampli?ers.
is twice as good as in the case of a simple oscilla
tion choke coupling.
"
d5
‘
Practical experiments-in conjunction with cor} ’
responding ampli?ers have also shown that tele- >
vision images of equal quality were obtained with
the following data:
-
‘
i
.
,20
,
In the drawing:
Y
l is an ampli?er stage, the anode circuit of:
which is coupled by a primary coil 2 with a sec
-
Oou hn
p
Turns on
-
g
.
-
-
Damping
Wmdmgs
Gamer
'
Ampli?ca
-
tion at
Wave
S’=5nia/volt
ondary 'coil 3, the carrier frequency being trans
2 01
mitted to the grid of the next stage 4. Two re
sistances 5 and 6 on the primary and secondary
Choke; ...... __
15o
"spoon
Transformerur
200
10,000 S2 p.
10,000os.
side produce damping, and the parallel capaci
ties 1 and 8 furnish the ‘two circuits with a de
The applicant has found experimentally and
30
theoretically that a pair of coils of this nature
are equivalent to a coupling choke with the
provement are
35
1 _____
___K2_—__
‘9211-0325
?'
, '
‘
125,,
25
'
50
~-
,
. ‘v
:30
a '
v
‘1-.
i
2. The avoiding of all detrimental capacities in
pacities to the unavoidable line and. design ca,
pacities, i. e., avoiding particular tuning con 4 .5
densers in concentrated form. Tuning of thecoils "3
- is effected solely vby correct selection-‘of the num:
ber of their turns for the purpose‘ of obtaining an
In this Zps is the geometric means of the two
oscillation resistances
150m.
150 m.
.
parallel withthecoils and reducing of the ‘ca- ' '
,
( was) _
'
l. A coupling as tight as, possible.
.
‘DJ
.
,
Conditional for the'accomplishment of this inf;
?ned natural frequency (up and ws.
following inductance Lx:
'
~
os'cillation'resistance
.
-
EC
of the primary and secondary side, and mp5 is the
geometric mean of the two natural frequencies.
to is the frequency transmitted by the coupling
device, K is the coupling factor of the two coils.
In considering this equation in the case of dif
ferent coupling factors it will be found that,
generally speaking, there are two coupling, fre
_
g
, L_
I
'
-
.
>
' 5.40
2- $3
as large as possible, becausevthe mean ,va'nieibr
Zp and 25 occurred as factors invthe ‘equation cited '1 Q‘
‘above.
'
.
‘
.
.
'
The damping should be Sogreat that.
both cir
,45
cuits cease 'to be oscillatory, which ‘is effected
when the resistance R in the case _'_ of ‘a parallel
damping becomes
"
’
(see
table).
,
q
'
-.
'
‘
EZ
>
‘
>
,
_'
q
_'
quenoies at which resonance occurs situated to
the right and left of ms, of which the long-wave
coupling frequency for the extreme case of a
The natural oscillation'of, the two 'coil's'is
selected‘to be equal. If, the'natural oscillations
100% coupling amounts'to- 70% of the secondary
natural frequency.
tion» merely becomes apparent in that‘, instead of
As compared with a simple choke with equal
windings and capacity conditions, a tightly cou
pled transformer with two coils equivalent to
the choke accordingly proves to be a structure,
60 the transmission resonance of which is- located
of the two coils differ. thisa'ccording‘to the jequaé.v .
an actual coupling factor K a‘vmodifled effective
coupling
'
factor.'
K"_—_.K--..-.
‘
‘ 1.1;
’
f
"
'
‘
3;“
enters into effect." _It is accordingly inlthe inter
co »
2 .
2,131,193
ests of a coupling as tight as possible. to select
the natural oscillation of the secondary coil not
television arrangements having a primary and a
. lower but higher than that of the primary coil if
secondary winding, which are clamped by damp
carrier frequency ampli?ers more particularly in
there is any compulsion at all to accept different , 1' ing resistances, both of said windings are dimen
natural oscillations. Beyond this there applies'
according to the inventionthe dimensional equa-,
tion: Natural frequency equals
-
"sioned with their inherent capacities in such
manner that bothsaid winding-coils have the
7 same natural frequency, said natural frequency
being smaller than the carrier frequency to be
10
1/5
transmitted,’ said winding-coils being coupled
,
with each other as tightly as possible and said 10
of the unmodulated carrier frequency.
inherent capacities being made as small as pos—
I claim:
1. A high-frequency coupling transformer for
carrier frequency ampli?ers more particularly in
15 television arrangements having a primary and a
‘secondary winding-which are damped by damp
sible, said damping resistances being connected
in parallel to said winding-coils and’ dimensioned
such as to provide an overdamping i. e. the log
arithmic decrement of said circuit arrangement 15
is ‘larger than 211-.
'
ing resistances, both‘ of said windings are dimen
-'6. A high-frequency coupling transformer for
sioned with their inherent capacities in such. carrier vfrequency ampli?ers more particularly in
‘manner that both said Winding-coils have the television arrangements having a primary and a
20 same natural frequency, ‘said natural frequency
secondary winding, both of said windings are ‘di a0
being smaller than the carrier frequency to be mensioned with their inherent capacities in such
transmitted, said winding-coils being coupled manner that both said Winding-coils have the
with ‘each other as tightly aspossible and said same natural frequency, said natural frequency
inherent capacities being made as small as pos
being smaller than the carrier frequency to be
'
25 sible.
transmitted and having a value amounting to
'2. A high-frequency coupling transformer’for nearly 70% of the carrier frequency to be trans 25
carrier frequency ampli?ers more particularly in mitted said winding-coils being coupled with each
television arrangements having a primary and a
‘secondary winding, which are damped by damp-V
ing resistances; ‘bothof' said windings are dimen
sionedwith their inherent-capacities in such
mannerthat ‘both said ‘winding-coils have the
same natural frequency, said natural frequency
‘being smaller than the carrier frequency ’to be
35 transmitted, and having a value amounting to
nearly 70% of the carrier frequency to be trans
' mitted said winding-coils being coupled with
each other as tightly as possible and said inher
ent capacities being’ made as smallas possible.
3. A high—frequency coupling transformer for
40
carrier frequency'ampli?ers more particularly in
television arrangements ‘having a primary and a
secondary windihg,_ which are damped ‘by damp
ing resistances, both of sa‘idwindings are dimen
45 sioned with their inherent capacities - in such
manner that both‘ said winding-coils‘have the
same natural frequency, said natural frequency
‘being smaller than the ‘carrier frequency to be
other as tightly as possible and said inherent ca~
pacities being made as small as possible, said
Winding-coils being damped by resistance-reac
30
tion of theone winding-circuit-damping on the
other winding circuit~such as to provide an over
damping i. e. the logarithmic decrement of said
circuit arrangement is larger than 21r.
7. A high-frequency coupling transformer for 35
carrier frequency ampli?ers more particularly in
television arrangements having a primary and a
secondary winding, which are damped‘ by damp
ing resistances, both of said windings are dimen
sioned’ with their inherent capacities in such .40
manner that both said Winding-coils have the
same natural-frequency, said natural frequency
being smaller than the carrier frequency to be
transmitted, and having a value amounting to
nearly 70% of the carrier frequency to be trans
mitted, said winding-coils being’ coupled with
each other as tightly as possible and said inher
ent capacities being made as‘ small as possible,
transmitted, said winding-‘coils being‘ coupled said damping resistances being connected in
so ‘with each otheras tightly as-possible and said series to said winding-coils .as to provide at least
inherent capacities being vmade assmall as pos'—
“sible, said damping ‘resistances being connected
1in parallel to said winding-c‘oiflsand‘dimensioned
such as‘to provide at least an'laperiodical damp
65 ing of said coupling transformer arrangement.
4. A high-frequency coupling transformer for
carrier frequency ampli?ers more particularly in
television arrangements ‘having a vprimary and a
' secondary winding, both of saiid‘windings' ar'edi
mensioned with their inherent capacitiesin such
manner that both said- winding-coils vhave the
samenaturalfrequency, said natural frequency
being smaller than the carrierv frequency to be
transmitted, and having a value "amounting to
nearly 70% of the carrier frequency to be trans
mitted. said winding-coils being coupled with
each other as tightly as possible and said inher
ent capacities being made as small as possible
VsaidWinding-‘coils being damped at 'least aperi
70 odically by resistance reaction of. the ‘one Wind
ing-circuit—damping on the other‘Win'ding-cir
cult.
'
"
'
an aperiodicaldamping. of said coupling trans
former arrangement.
,
8. A, high-frequency coupling transformer for
carrier ‘frequency ampli?ers more particularly in
television arrangements having a' primary .and'a
secondary winding, which are damped by damp
ing resistances, both of said windings are dimen
sioned with their inherent capacities in such
manner that both ‘said winding-coils ‘have the
same :natural frequency, said'natural frequency 60
being smaller than the carrier frequency to be
transmitted, said winding-coils being coupled
withl'each other as tightly as possible and said
inherent capacities being made as small as pos
sible, saiddamping resistances being connected 65
in parallel to said winding-coils, each of both said
damping 'resistances‘having at the most a value
equal to the value
L
C
of said winding-coils.
’
'
5. A high-frequencyicoupling transformer for
1
.‘KURT SCHLESINGER.
70
Документ
Категория
Без категории
Просмотров
0
Размер файла
349 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа