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Патент USA US3041537

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June 26, 1962
E; ALIZON ETAL
3,041,528
MAGNETIC AMPLIFIER DEVICE HAVING ADAPTED COMPENSATION
3 Sheets-Sheet ' 1
Filed Dec. 6, 1957
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June 26, 1962
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MAGNETIC AMPLIFIER DEVICE HAVING ADAPTED COMPENSATION
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June 26, 1962
E. ALIZON ETAL
3,041,528
MAGNETIC AMPLIFIER DEVICE HAVING ADAPTED COMPENSATION
Filed Dec. 6, 1957
3 Sheets-Sheet 3
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INVENTORS '
FT/E/VNE AL/Z?b'
CLAUDE" NON/N
7' ENE)’
United States Patent 0 Mice
3,041,528
Patented June 26, 1962
2
1
In order that direct current may ?ow in the utilisation
3 041,528
MAGNETIC AMPL’IFIER DEVICE HAVING
.
circuit of the ampli?er A, the circuit includes a ?ltering
and regulating device consisting of an inductance LA and
a condenser CA. A ?ltering and regulating device con
ADAPTED COMPENSATION
Etienne Alizon, Le Chesnay, and Claude Monin, Villen
nes-sur-Seine, France, assignors to Compagnie Indus
trielle des Telephones, Paris, France, French corpo
sisting of ‘an inductance ‘LB and a condenser CB in the
utilisation circuit of the ampli?er B is optional. Imped
ration
'
ances Y and Z are inserted, one as an adusting impedance
Filed Dec. 6, 1957, Ser. No. 701,184
Claims priority, application France Dec. 21, 1956
9 Claims. (Cl. 323-89)
The present invention relates to magnetic ampli?er de
vices of the kind employing self-saturated magnetic am
in the utilisation circuit of the ampli?er A and the other
in- the utilisation circuit of the ampli?er B.
The ampli?er A further includes a negative feedback
winding em. having =N turns connected to the inductance
LA, and the ampli?er B includes a polarising or biasing
pli?ers.
winding Ep having N turns, the latter winding being fed
by the current of the utilisation circuit of the ampli?er A.
The characteristic curve Im(ATt) of the ampli?er B
netic ampli?er device, the operation conditions of which 15
remain completely unchanged when the parameters which
has the form indicated in FIGURE 2, and, if the ampli
?er A had no negative feedback winding it would have
determine the operation of this magnetic ampli?er vary,
a similar characteristic curve. However, by reason of the
for example in the case of temperature variation, feed
voltage variation or control voltage variation. Accord
negative feedback, the characteristic curve of the ampli
ingly the invention provides a magnetic ampli?er device 20 ?er A has the form shown in FIGURE 4. Hence, there
having adapted compensation, wherein there are provided
‘being no polarisation applied to the ampli?er A, if ImA is
the current supplied into the utilisation circuit of the am
at least two magnetic ampli?ers, the ?rst of which per
pli?er A and I1p the current in the polarising winding of
‘forms the function of a pilot or control ampli?er, while
the ampli?er B, then ImAzlp and the point of operation
the second is subject to the regulation of the ?rst, the
?rst magnetic ampli?er effecting an automatic polarisation 25 of the device A of FIGURE 5 is represented in FIGURE
or biasing of the second magnetic ampli?er, and wherein
4 by the point P.
the output circuit of the pilot ampli?er through which
FIGURE v6 shows how the point of operation P of the
ampli?er A, having negative feedback, is deduced from
direct current flows, comprises in series, an inductance and
a feedback winding wound on the magnetic circuit of
the point p‘ of the characteristic curve ImA(AT,) without
said pilot ampli?er, and the output of this ‘feedback wind 30 negative feedback. In the ?gure:
ing is connected to a polarising winding wound on the
ATo represents the ampere-turns corresponding to half
An object of the present invention is to provide a mag
magnetic circuit of the regulated ampli?er.
the width of the hysteresis loop.
pP=AT°, or by construction pP=NImA=NIp, whence:
In order that the invention may be more clearly under
stood and readily carried into effect, two embodiments
thereof will now be described with reference to the ac 35
companying drawings, in which:
FIGURES l, 2, 3, 4, 6 and 8 are curves illustrating the
operation of the magnetic ampli?ers.
FIGURE 5 illustrates diagrammatically one embodi
40
ment of the invention employing two ampli?ers.
FIGURE 7 is a diagram illustrating the operation of
the arrangement according to FIGURE 5.
FIGURE 9 illustrates diagrammatically a further em
ATO
In: N
It follows that the current in the polarising winding
E1) of the ampli?er VB is such that the polarisation of this
ampli?er will be, in absolute value,
N
ATo
If the direction of the winding E1, is appropriately
chosen, this polarisation will be equal to -—AT0 in alge
bodiment of the invention.
FIGURE 10 is a diagram illustrating the operation of 45 braic value, as is indicated in FIGURE 8. An automatic
the arrangement according to FIGURE 9.
~
By Way of explanation it is pointed out that a self
biasing or polarisation of the ampli?er B is thus effected,
so that the current which it supplies is its minimum cur
saturated magnetic ampli?er which is controlled by direct
rent IOB, commonly called the residual current.
current has a characteristic curve of rectangular form
any reason, such ‘as temperature variation or variation
It for
of the alternating voltage, etc., the characteristic curve
ImB(ATt) shifts in such manner that the vertical portion
of this curve remains parallel to itself and the polarisa
pli?er also possesses a characteristic curve Im(ATt) of
tion of the magnetic ampli?er B will be automatically
the form illustrated in‘ FIGURE 2, giving the mean cur
modi?ed, so that the inoperative point will always be at
rent Im in the circuit of the utilisation winding as a func
tion of the continuous ampere-turns ATt applied to the 55 the point at ‘which the current supply 1mg is minimum.
As is shown by \FIGURE 7, the characteristic curve
magnetic circuit. If a “negative feedback" winding, fed
ImA(ATt), having no negative feedback, has shifted by
by the current supplied to the utilisation circuit of the mag
the quantity AATt, in the same manner as the character
netic ampli?er is introduced, and if N is the number of
istic curve ImB(ATt), since the two ampli?ers are sub
turns of this winding, then ‘a new characteristic curve
ject to the same temperature and feed conditions. The
Im (ATt) with negative feedback is deduced from the char
new current ID, supplied by the ampli?er A is such that:
acteristic curve Im(ATt) without negative ‘feedback as in
such as that indicated in FIGURE 1 showing magnetic
?ux as a function of ampere-turns.
Such a magnetic am
dicated in FIGURE 3. The characteristic curve of FIG
AT°_ A AT.
URE 4 is thus obtained.
N
N
Referring to- the ?rst embodiment of the invention, the
device illustrated in FIGURE 5 comprises two magnetic 65 The polarisation of the ampli?er B then becomes:
ampli?ers A and B, the magnetic circuits of which are
ATo AT,
identical. These magnetic ampli?ers ‘are disposed to
gether in a thermostatically controlled enclosure, and in_
clude utilisation windings e11 for A, and E“ for B, which
Ni:
N "M N
The new point of operation of the ampli?er B is there
are identical and are fed by the same alternating-current 70 fore the point R,,.
In the foregoing, it has been assumed that the ampli
source u. R-DA and RDB are recti?ers disposed in series
with the winding eu and the winding Eu respectively.
?er B has its inoperation point at the minimum current
3,041,528
supplied, namely R. However, it may be desired that
the inoperative point should be ?xed by an additional
Finally, it will readily be appreciated that it is thus
possible to control a whole chain of ampli?ers such as B
polarisation at R1, as shown in FIGURE 8.
It ampere-turns NCIc are then applied to an ampli?er
such as B by a control winding E,c of resist-ance R fed by
by means of a single ampli?er such as A, provided only
that the ampli?ers B1, B2 . . . Bn bear the same ratio to
A as does B, the utilisation winding of A ‘feeding into the
a direct voltage U0, the point of operation of the ampli
‘series polarising windings of the ampli?ers B1, B2 . . . B“.
?er B will move from R1 to Q1 as shown in ‘FIGURE ‘8.
We claim:
1. A magnetic ampli?er device having adapted com
and becomes for example equal to Uc—AUc, the control
pensation, wherein there are provided at least two mag
ampere-turns become
10 netic ampli?ers each having an output circuit, the ?rst
of which performs the function of a control ampli?er,
N
R
while the second is subject to the regulation of the ?rst,
a load connected in series with the output circuit of only
The new point of operation Q1, may be situated to the
the second magnetic ampli?er, the ?rst magnetic ampli?er
If, under these conditions, the control voltage U,3 varies,
left of the point R, for example at Q2‘, in FIGURE 8, and
having its output circuit connected to eifect an automatic
the operation of the magnetic ampli?er is modi?ed, i.e.,
the control voltage U,,—AUc is incapable of shifting oper
biasing of the second magnetic ampli?er, and wherein the
output circuit of the control ampli?er, through which cir
cuit direct current flows, comprises in series, an induct
ation past the biasing value —AT,, and the output current
ImB cannot shift from R1 to Q1.
ance and a feedback winding Wound on the magnetic cir
The embodiment of the device as illustrated in FIG 20 cuit of said control ampli?er, and a biasing winding wound
URE 9 obviates this disadvantage. There has been pro—
on the magnetic circuit of the regulated ampli?er con
vided on the ‘ampli?er A, a polarising winding ec having
nected to said feedback winding in the output circuit of
nc turns of resistance re. This winding is continuously
said ?rst magnetic ampli?er.
supplied with a voltage Uc, while the control winding ‘E6
2. A device as claimed in claim 1, wherein the mag
of the ampli?er VB is supplied with this voltage only at 25 netic ampli?er subject to regulation is biased so as to
the desired instant, this being effected by any appropriate
supply its minimum current.
device. (In FIGURE 9, this device is diagrammatically
3. A device as claimed in claim 2, wherein an adjust
represented by a switch IR.)
ing impedance is disposed in series with the biasing wind
As is shown by FIGURE 10, the current In“, supplied
ing of the regulated ampli?er.
by the ampli?er A is represented by the point P1, from 30
4. A device as claimed in claim 3, wherein the control
which is deduced the inoperative point R1 of the ampli
magnetic ‘ampli?er further comprises a biasing winding
?er B. If the control voltage U.c varies, taking the value
connected to a source of direct current and the magnetic
Uc—AUc, the ampere-turns of the winding ec become
ampli?er subject to regulation ‘further comprises a con
U,—~AU,,
trol winding, which control winding includes means for ,
35 selectively energizing the same from said direct current
n,—-————
7's
source.
The point of operation P1 of the ampli?er A moves to P1a
a
5. A device according to claim 4, wherein the magnetic
circuits of the ampli?ers are identical.
6. A device according to claim 5, wherein the mag‘
and, under these conditions, the inoperative point R1 of
the ampli?er B moves to Rm.
When the new control voltage U(,—AUc is applied to 40
netic ampli?ers are arranged in the same thermostatically
the control winding E0 of the ampli?er B, the point of
controlled chamber.
operation of this ampli?er moves to Q'la. It is then pos~
7. A device according to claim 6, wherein the ?rst mag
si'ble to write, with reference to ‘FIGURE 10:
netic ampli?er controls a plurality of second ampli?ers,
the biasing windings of the latter being connected in se
lies in the output circuit of the ?rst ampli?er.
8. A device according to claim 7, wherein the same
parameters determine the operation of all the ampli?ers.
9. A magnetic ampli?erdevice comprising a control
magnetic ampli?er and at least one magnetic ampli?er sub- "
50 ject to regulation, each magnetic ampli?er including a
saturable magnetic circuit, a main winding wound on said
saturable magnetic circuit with each main winding hav- ,
ing a respective recti?er connected in series therewith to
a source of alternating current, a feedback winding wound
55 on the saturable magnetic circuit of the control magnetic
ampli?er with an impedance connected in series there
with to the main winding and recti?er of the control ma g
netic ampli?er, and a ‘biasing winding wound on the satu
rable magnetic circuit of each magnetic ampli?er subject
60 to regulation and connected to the feedback ‘winding of
the control magnetic ampli?er and ‘fed by output ‘current
of the control magnetic ampli?er to insure automatic
As long as AUc is smaller than U0, the points R1 and Rm 7
biasing continuously regulating the respective magnetic
‘are ‘on one side of the vertical of the point R, and the
ampli?er subject to regulation, each magnetic ampli?er
points Qla and Q1 on the other side of the said vertical. 65 subject to regulation having a separate load connected in
series with the main winding and recti?er of only the re
Therefore, the ampli?er B continues to operate under the
spective magnetic ampli?er subject to regulation.
same conditions when the voltage Uc varies. 'Ihis pro
cedure may be adopted for as many control voltages Uc
References Cited in the ?le of this ‘patent,
as desired. It is important to note that no restrictive
70
hypothesis has been made regarding the nature of the
UNITED STATES PATENTS
load irnpedances Y and Z of the utilisation circuits of the
2,561,329
Ahlen _____________ __ July 24, 1951
ampli?ers A and B. Notably the load impedance Z may
2,694,178
Smith _______________ _V__ Nov. 9, 1954
consist of the input impedance of a four terminal net
2,754,474
Earhart __-- ___________ .._ July 10, 1956
work or any equivalent device,
Weir __Q_ _____ ._.; _____ __ ‘Dec. 24, 1957
75 2,817,807
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