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Патент USA US2131424

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Sept’ 27, 1933-
P. F. BECHBERGER ET AL
2,131,424
SELECTIVE VOICE FREQUENCY RELAY
2 Sheets-Sheet l
‘Filed May a, 1954
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Sept. 27, 1938.
2,131,424
P. F. BECHBERGER .ET AL
SELECTIVE VOICE FREQUENCY RELAY
Filed May _8, 1934
2 Sheets-Sheet 2
J? E?echberyer
U. A5’. Thompson
Frea’an'ckjYolbamz ~
6511*“
attorney
Patented Sept. 7, I 1 938
2,13 1
.
UNITED STATES PATENT OFFICE
2,131,424
SELECTIVE‘ VOICE FREQUENCY RELAY
Paul F. Bechberger, Bergen?eld, N. J., Charles
S. Thompson, Brooklyn, N. Y., and Frederick
Holborn, Cedar Grove, N. J., assignors to The
Western Union Telegraph Company, New York,
N. Y., a corporation of New York
Application May 8, 1934, Serial No. 724,540
7 Claims. (Cl. 175-320)
This invention relates to alternating current rents IA and In ?owing in the respective windings
electro-magnetic devices, such as relays, which of the relay, may be built up to several times
are selective to a particular frequency band and the value that could ordinarily be obtained. T0
are especially adapted for multi-channel carrier 'make this clear, we shall now refer to the prin
5 current telegraph systems, although their use ciples underlying our relay construction.
is not con?ned thereto.
Referring to Fig. 1, let the following relations
It is known that electro-magnets, relays and in the two inductively coupled resonant circuits
similar devices, having only one magnetic circuit hold among the circuit constants:
will not operate smoothly from an alternating
'
1
LlCl=L2c =3
10 current source because the alternating flux becomes zero twice in each cycle.
To’ overcome ‘
this di?lculty such devices have been made with
I two magnetic circuits energized by currents sup-
plied at the same frequency but di?ering in
15 phase so that the magnetic torque applied to the
armature will never become zero. It is desirable
to obtain the two currents from the same source
and to obtain the phase difference by some phase
shifting device. This has been accomplished in
20 various ways, the shaded pole alternating cur—
RIZWLIK and Rzzw'l‘zK
K=—M=
(3) l5
4141'’
“:21 times the resonant frequency.
(4)
K=the coefficient of coupling between
the two inductances L1 and L2.
M=the mutual inductance between the
(5)
two inductances L1 and L2“,
(6)
Substituting forthe loose coupled transformer
quencies than to other frequencies. The object
If‘ and L2 Its eqmva'lent transformer and mm‘
tlplymg 1/ C2 and R2 by
acter in which the energizing windings will em-
L1
body the inductance of the frequency discrimiacteristics, viz;—frequency selection and smooth
.0 Operation over the responsive band_
In‘ explaining the principles underlying our
_
_
(L1+L1)C=;,,07
to relays, we shall refer to the accompanying
planatory of the underlying principles;
Figures 4 and 5 are plotted curves showing
the current and phase frequency‘characteristics
of the coupled resonant circuits of relays em‘0 bodying 0m- invention and Operating under
certain stated conditions_
Figures 8 to 14 are diagrams illustrating various modi?ed arrangements of the elements in
.
'1
relays constructed in accordance with this in-'
L
‘ K
w°( 1+1”)
(7)
(8)
(9) 35
__
_
10
( ) 45
R2=“’°L1K
vention.
resonant circuits. By properly tuning and coupling these two circuits we obtain the desired
characteristics above mentioned.
‘66
By proper use of resonant circuits the cur-
7
R =
Figures 6, 7 and 15 are schematic diagrams of
two windings which are arranged as elements of
R=‘°~(Ll+L2)K '
L2=(L1+L2)K
30
,
NOW, if We refer both the “leakage” induc
tiinces (L1) 0f the equivalent transformer _ of
Flg- 2 to the left side’ makmg a dissymmemcal
equivalent transformer of only two inductances, 40
and changing the circuit constants to suit, we
have the cu‘cfult Show“ "1 Flg' 3
The circuit relatlons now become_
the resonant circuits of the relay.
In constructing an alternating current relayresponsive
to and operatingv smoothly over. a
hand of frequencies, we provide the relay with
_
we have a clrcmt as m Fig' 2'
Here the relations are-as follows:v
1
invention and the manner of applying the same
drawings, in which—
Figures 1 to 3, and 8 to 14 are diagrams ex-
25
I;
nating circuit and to obtain both desirable char-
50
20
more readiely tosoge 223111612X; :rrgag'd r?pggg
35 of our invention is to provide a relay of this char-
46'
(2)
where
rerIitt relafyt
beigg
_a cbtimmon applicationis o
n
e 1r
35
(1) 10
0
(11)
=_1_
'
(L‘+L2)C‘_L’C2‘ a,“
L2=(Ll+L2)Kz
_
(12)
(13)
50
Assuming a practlcal value of K =1, and fre
qllency fo=1000, and determining how the cur
rents IA and IB and their phase difference vary
with frequency, we have the curves shown in
Fig. 4-. It will be observed that this circuit has 55
2,131,424:
2
marked phase shifting and frequency discrimi
nating properties.
circuits and moving parts are concerned.
.
Let us now take another example, namely, a
band pass ?lter. Starting with a constant K
type of band pass ?lter as shown in Fig. 2, f1
and f2 being the lower and upper frequency
limits respectively, the circuit relations are as
follows:
The
interchangeable relay apparatus is embraced
within thegdotted line rectangles R in Fig. '7.
In relays receiving a ‘constant band width and
In.
employing the type of circuit exempli?ed by
Figs. 3 and 13, the'turn ratio of the associated
transformers is approximately directly propor
tional to the frequency to be received. In cases
such as Figs. 8 and 10 a similar but inverse pro
in
portion is involved.
We have illustrated a number of circuit ar
rangements embodying our invention but it will _
10
be evident to engineers that other modi?cations
can be made within the scope of our invention
and within the purview of the appended claims.
15
We claim:
-
1. A relay adapted to be operated by current
of a de?nite band of frequencies, comprising a
Replacing the symmetrical equivalent trans
former composed of two Li's and L2 in Fig. 2
network selective to said band of frequencies and
‘having series and shunt branches, each branch 20
by a dissymmetrical equivalent transformer of
two inductances, we have a circuit as in Fig. 3.
Now the circuit ‘relations are
series and shunt branches of said network.
2. In a relay device as set forth in claim 1,
means- for increasing the flow of current in the
(18)
relay windings by making the elements of each
branch of the network resonant at approxi
mately the frequency to be received.
(20)
35
said relay having energizing windings consti~
tuting respectively the inductive elements of the
(17)
(19)
30
including an inductive element and a condenser,
3. An electromagnetic device responsive to a 30
de?nite band of frequencies, comprising ener
gizing windings arranged in series and shunt re
lation, condensers connected in circuit with each
of said windings, said windings and condensers
jointly constituting a network selective to said
band of frequencies and excluding frequencies
outside of said band.
fz_ f2 2
Choosing practical values of f1=950 and
f2_—-1050 cycles and plotting the currents and
40 their phase difference against frequency, we have
fig. 5. This circuit is also seen to be satisfac
cry.
The example shown in Fig. 3 is but one of
many satisfactory circuits and is merely repre
sentative of resonant circuits and band pass ?l
ters. Diagrams of some other circuits which may
be used are given in Figs. 8 to 14., inclusive.
In all of the various modi?cations, the series
and shunt impedances of the selective network
50 constitute the two energizing windings of the re
' lay, as shown in Fig. 15. In the cases illustrated,
each winding is associated with a condenser.
It is sometimes desirable to design the two mag
netic circuits with part of their paths in com
mon, as shown in Fig. 6, thereby giving the de
sired coupling between the two frequency dis
criminating circuits.
In a multi-channel carrier telegraph system,
relays of this type operating over the same band
60 Width. and from the same value of impedance,
would have the same value of Li. However, L2
will be different for each channel frequency. If
now both windings on relays for all the chan
nels are made to have the same inductance value,
and the two circuits in each case are connected
by a transformer as illustrated in Fig. 7, having
a turn ratio of
70
{a
L2
then the relays are interchangeable in the sev
eral channels insofar as the windings, magnetic‘
4. An electromagnetic device responsive to a
de?nite band of frequencies, comprising ener
gizing windings arranged in series and shunt
relation, condensers connected in circuit with
each 'of said windings to form circuits resonant
at approximately the desired frequency, said res
onant circuits jointly constituting a network
selective to said band of frequencies and exclud
ing frequencies outside of said band.
5. An electromagnetic device responsive to a
de?nite band of frequencies, comprising two
magnetic circuits having a common path form— 7
ing a portion of each circuit, energizing wind
ings for said circuits and condensers connected
.in circuit with each of 'said windings to form
resonant circuits at a given frequency, said wind
ings and condensers jointly constituting a net
work selective to said band of frequencies and 55
excluding frequencies outside of said band, said
common magnetic portion forming a coupling
between said two circuits.
6. An electromagnetic device responsive to a
de?nite range of frequencies comprising ener~
gizing windings, condensers connected to said
windings, said windings and condensers jointly
constituting a network selective to said range of
frequencies.
'7. An alternating current relay having a plu
rality of flux producing elements, auxiliary im
pedance elements connected to said ?rst named
elements and causing the relay to respond to an
exclusive range of frequencies.
PAUL F. BECHBERGER.
CHARLES S. THOMPSON.
- FREDERICK HOLBORN.
70
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