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Патент USA US3064117

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Nov. 13, 1962
A. JAKOUBOVITCH
3,064,108
HIGH FREQUENCY CURRENT GENERATOR
Filed April 4, 1960
2 Sheets-Sheet 1
H61
.Fm. 2
/n ve/n‘or'
ALBERT JA KOUBO V/TCH
By Way,
Nov. 13, 1962 ‘
A. JAKOUBOVITCH
3,064,108
HIGH FREQUENCY CURRENT GENERATOR
Filed April 4, 1960
2 Sheets-Sheet 2
FIGS
FiGA
lnvem‘or
ALBERT JAKOUBDVITCH
By/
Afforneys
United States Patent 0
11
1
.
2
3,064,103
in which the self impedance of the secondary winding is
varied in same time and in same direction as its coupling
with the primary winding, whereby the adjustment of the
energy transmitted to the consuming apparatus brings
corporate of France
Filed Apr. 4, 1960, Ser. No. 19,560
Claims priority, application France Apr. 7, 1959
8 Claims. *(Cl. 219—10.75)
about in same time the adaptation of the generator to its
load, thereby making useless to determine accurately the
induction coil for heating by induction.
.
10
'The present invention concerns a high-frequency cur
rent generator, particularly 'for heating by induction or
by di-electric loss.
' "
In some known. embodiments of high-frequency gen
erators for industrial use, the energy of the oscillating
circuit is taken by means of a transformer, the primary
of which forms at least a part of the self-inductance of
said circuit, while its secondary is connected to the con
suming apparatus.
The high~frequency current generators for the above
mentioned use must include means to vary within wide
limits, and preferably continuously, the energy trans
mitted to the consuming apparatus, while the energy pro;
duced by the oscillating circuit must be kept practically
constant, so that the working of the electron tube which
maintains the oscillations in said circuit, remains within
limits whichensurc optimum output.
-
In the known generators of this type, this result is
generally obtained by using transformers-having a con
tinuously variable coupling between their primary and
secondary winding-s.
>_
a
’
The transformers used in known generators of this type
allow to vary the energy transmitted to the consuming
apparatus only ‘within relatively narrow limits, particu
larly since it is not possible to give to their coupling values
about 0 and about 1; on the other hand, the ?xedness
of the self impedance of their secondary winding limits
the possibility of adjusting the generator to its'load: for
instance, in induction heating, it is difficult to empirically
determine the‘induction coil so as to obtain the optimum
generator
output.
'
'
Patented Nov. 13, 1952
A still further object of the invention is to provide a
high frequency current generator including a transformer
HIGH FREQUENCY CURRENT GENERATOR
Albert Jakoubovitch, Paris, France, assignor to Societe
de l’Electronique Francaise, Asnieres, France, a body
t
3,064,108
_
v
'
3‘
One object of the invention is to provide a high-fre
quency current generator which presents none of the
inconveniences of the known generators above men
A ?nal object of the invention is to provide a high
frequency current generator including a transformer, the
two windings of which are connected in series with each
other so as to highly increase the coupling of said wind
ings and consequently the reactive energy transmitted to
the consuming apparatus, whereby said consuming ap
paratus can be equipped for instance with an induction
coil having a Q-factor equal to 40, whereas the known
generators cannot feed induction coils having a Q-factor
higher than from 8 to 15.
Several embodiments of a high frequency current gen
erator according to the invention, specialy intended for
the heating by induction, have been described below’ with
reference to the annexed drawing, in which:
FIGURES l and 2 are respectively an elevation and a
plan view of a ?rst embodiment of the transformer with
a continously variable coupling, with which the generator
according to the invention is equipped.
FIGURE 3 is a circuit diagram of a Colpitts oscillator
- included in the generator according to the invention.
FIGURE 4 is a plan view of a second embodiment of
the transformer with which the generator according to
the invention is equipped.
.
ing consists essentially of a ?xed primary winding 1,
formed in the considered example of several circular
turns, and of a single turn 2, forming the secondary wind
ing, also circular and arranged around the primary 1.
. The secondary turn 2 is made of three independent con
ductors: a semi-circular conductor 2’ and two quadrantal
conductors 2" and 2"’ of a slightly smaller radius. Each
end of the semi-circular conductor 2’ is connected by a
hinge to one end of one of the quadrantal conductors 2",
2"’; each hinge consists essentially of a pivotal axis, 3"
or 3"’, integral with a part, 4” or 4"’ ?xed at the end of
45 the conductor 2" or 2"’, upon which engages, so as to turn
Another object of the invention is to provide a high
with some friction, the part 5" or 5"’ ?xed at one of the
tioned.
‘
’
_
.
frequency current generator including a transformer in
ends of the conductor 2'. At the ends of the conductors
2” or 2"’, remote from the parts 4” and 4"’, are ?xed
conductors 6", 6"’; these conductors are insulated
they can be displaced by pivoting in relation the one'to 50 radial
from each other and constitute the connections to the
the other as well as in relation to the primary winding,
secondary turn 2.
which at least one of the turns of the secondary winding
is made in two parts, hinged the one to the other so that
which is kept ?xed.
A further object of the invention is to provide a high
frequency current generator with a transformer, to the
windings of which it is possible to give coupling values
about 0 (in the case when all the turns of the secondary
winding are “folded up” so as to present minimum areas),
and about 1 (at least 0.85 in the case when all the turns
of the secondary winding are “unfolded,” so as to pre
sent maximum areas), and also all the intermediate
values, whereby the amount of energy transmitted by
.said generator to the consuming apparatus can be con
tinuously varied between its maximum value and an
eventually very small fraction of said maximum value
(for instance 3/1000).
i
The transformer shown in FIGURES l, 2, of the draw
Electrical continuity between the three conductors 2’,
2", 2"’, forming the secondary turn is ensured by the
parts 4", 4"’, 5", 5"’ and the hinge axes 3", 3"’ which
connect them, said conductors being thereby joined in
series.
The whole of the turn 2 is carried by an axial support 7
which forms the prolongation of the hinge axis 3", from
which it is electrically insulated.
In the example shown, the half turn formed by the
quadrantal conductors 2" and 2"’ remains ?xed, as also
the primary winding 1 with which it is concentric; on the
other hand, the half-turn 2" can pivot about the hinge
axes 3" and 3"’; it becomes thereby possible to give to
8,064,108
4
3
ful for the making of transformers with two symmetrical
this half-turn 2’ any inclined position intermediate be
half-secondaries.
,
tween its horizontal position shown in full lines in the
(2) The secondary winding is inside the primary wind
?gures, and in which its area presented to the magnetic
mg.
flux of the primary winding 1 is a maximum, and its
(3) The turns of the primary and secondary windings
horizontal position shown in dot-dash lines, in which UK
can have any desired form, not circular, for example
the area presented by said turn 2 is practically zero;
rectangular or square.
two of these intermediate inclined positions have also been
The characteristics of these‘ variedembodiments can
shown in dot-dash lines. In the limiting horizontal
also be combined together within the scope of the present
position corresponding to the maximum effective area of
the turn 2, the coupling of the windings 1 and 2 may 10
invention.
reach the value 0.85 while it falls practically to zero
in the other horizontal limiting position, and assumes,
in a continuous fashion, every value between these two
limits, as the half turn 2’ is pivoted from one to the other
of the two horizontal limiting positions.
a
The oscillator shown in FIGURE 3 is of the classical
What I claim is:
'
.
'
'
e
1. A device for generating a high frequency heating
energy in a load, including an electric oscillator and
means to transfer a continuously variable part of the
oscillating energy from said oscillator to the load, said
means comprising a ?xed air-core coil connected with
said oscillator and curved conductors, disposed coaxially
type, known as a Colpitts oscillator, and it is essentially
constituted by a three-electrode tube ‘8, the cathode of
which receives its heater current through a transformer 9,
with said ?xed coil and hinged to each other, so as to be
electrically connected in series and to be pivot-ally dis
placeable in relation to each other and to the ?xed coil,
said conductors being coupled with the load.
said transformer being supplied through the choke coils
10, whereas its anode receives the necessary positive high
voltage through the choke coil 11, and its grid is biased
2. The device of claim 1, in which two of the curved ’
conductors are ?xed and separately connected with the
by a resistor 12 connected to the ground and shunted
terminals of the load, a third conductor being hinged to
by a condenser 12': the inductance .part of the oscillat
ing circuit is constituted by a transformer with a contin 25' said two ?xed conductors so as to be pivotally displace
able in relation thereto.
uously variable coupling, such as illustrated in FIGURES
3. 'A device for generating a high frequency heating
1 and 2; the primary 1 and the secondary 2 of said trans
energy in av load, including an electric oscillator and
former are connected in series with each other; to the
means to transfer a continuously variable part of the
terminals of the variable inductance thus‘ constituted are
connected the capacitive divider 13-43’ and the addi 30 oscillating energy from said oscillator to the load, said
means comprising a ?xed air-core coil connected'with
. tional capacitor .14, which form the capacitance part of
the oscillating circuit.’ The circuit is connected to the 7
, said oscillator, a number of ?xed curved conductors dis
posed coaxially with each other and wit-h'the ?xed coil,
anode of the tube 8 by a condenser 15: a predetermined
two insulated axes, each engaged with one end of each’
and constant fraction of the oscillating energy of said cir
cuit, with a suitable amplitude and phase, is taken at the 35 ‘of said ?xed ‘conductors, a same number of curved con
ductors disposed also coaxially with, each other and V
middle point of the divider 13—13' and applied, so as to
engaging‘with their ,erspective ends said insulated axes
maintain the oscillations,'upon the'cathode' of tube 8
between the ends of said ?xed conductors, so as to be to-,
through the condensers 15, which are associated with the
' gether pivotally'displaceable in relation to said ?xed con
condensers 15' to keep the two windings of the heater
transformer 8 at the same alternating voltage in relation 40 ductors and air-core coil, and means to electrically con
nect the ends of each ?xed conductor with the adjoining
to the earth. ‘The induction coil 16, which is wound
ends of one of the displaceable ‘conductors, so as to form
around the piece to be heated, is connected to the termi- '
a plurality of coaxial turns connected in series with each
nals of the secondary 2 of the autotransformer.
By pivoting the half-turn 2' between its two extreme
positions (FIGURE 2), it is possible to vary the power
delivered by the induction coil -16 in a continuous way be
tween its maximum value and a very small fraction of
other.
.
4. The device of claim 3, in which each ?xed conductor
is longer than the displaceable conductor with which it
is connected'so as to form a turn.
'
'
5. The device of claim 3, in which the structure formed _
by'the ?xed and displaceable conductors hinged to each
other hand, the induction coil 16 can be ?tted on the piece
tobe'heated, irrespective of the value of the impedance 50 other is supported by at least one of the insulated axes,
and means are provided .to drive together the displaceable
of said coil, particularly without accurately adapting it to '
conductors through one of ‘said insulated axes.
the oscillator; in fact, experiment and calculation have
6. The device of claim 3, in which ‘the ?xed and dis
shown that this oscillator keeps on working ‘in the best
placeable, conductors are half-circular, the two insulated
conditions even when the secondary 2 of its autotrans
axes being aligned with each other.
former supplies induction coils having very different
7. A high frequency current generator for high fre-‘
impedances, for example in the ratio of 1 to 20‘. More
quency
heating, including inductance and capacitance
over, the autotransformer allows to supply the induction
parts, connected together so as to constitute a high fre
coil with a sufficient amount of reactive energy, even if
quency oscillating circuit, means to maintain oscillation
said coil presents a Q-factor as high as 40.
in said circuit, ‘a high frequency transformer, the prim
60
The autotransformer shown'in FIGURE 4 differs only
ary and secondary windings of which are connected in
from the autotransformer of FIGURES 1 and 2 in that its
series with each other and so as to form at least one of
secondary 2 includes two circular turns, each diametrally
the inductance parts of the oscillating circuit, said sec
divided in two half-turns: a ?xed half-turn 2"1—‘2”'I,
ondary winding having ‘at least one of its turns made in
2"II——2"’H, provided with the connections 6" and 6'”
two parts, hinged the one to the other, so as to be piv- "
65
of the winding, and the other 2’I-—2’n pivoting round
said maximum value, for instance 1/1000 of it.
on the
insulated axes 3"and 3'”; a brazing 17 establishes an elec
tric connection between one of the ends of the primary 1
and the end 6"’ of the secondary 2.
7
otally displaceable in relation the oneto'the other and to
the fixed primary winding, and means to transfer the
oscillating‘energyfrom said transformer secondary wind
ing to the piece to be heated.
8. A high frequency current generator for induction
Within the scope of the present invention are also
70
embodiments of the auto-transformer which differ par-7
heating, including'a high frequency autotransf-ormer, the
ticularly from the embodiments above described in the
secondary winding of which has at least one of its turns
following points:
i
.
V
(1) Both half-turns may be pivoted in relation to the
made in two parts, hinged the one to the other, so as to
be pivotally displaceable in relation the one to the other
primary winding independently of each other; this is use 75 and to the ?xed primary winding; capacitors connected.
5
3,064,108
across said autotransformer so as to form a one-tapped
voltage divider, a multi-electrode electron ‘tube with suit
able heating, supplying and biasing means, a capacitive
6
References (Zited in the ?le of this patent
UNITED STATES PATENTS
connection between one terminal of said autotransformer
and the output electrode of said electron tube, a connec
tion between the tap of said voltage divider and the con
trol electrode of said electron tube, and an induction coil
connected across the secondary winding of said auto
1,679,240
2,093,158
2,623,176
Csanyi ______________ __ July 31, 1928
‘Pratt ______________ __ Sept. 14, 1937
Witsenburg et a1 _______ __ Dec. 23, 1952
transformer.
1,008,426
Germany ____________ __ May 16, 1957
FOREIGN PATENTS
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