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Патент USA US3048776

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Aug. 7, 1962
R. WEPPLER
3,048,765
FREQUENCY MULT I PL IEIR SYSTEM
Filed Aug. 15, 1958
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INVENTOR
lgudolf Weppler
I
ATTORNEY
3,048,765
Patented Aug. 7, 1952
2
1
output power of a conventional frequency multiplier sys
tem as described is only a small fraction, for example 4
3,048,765
FREQUENCY MULTIPLIER SYSTEM
Rudolf Weppler, Numberg, Germany, assignor to
Siemens-$chuckertwerke Aktiengesellschaft, Erlaugeu,
Germany, a corporation of Germany
Filed Aug. 13, 1958, Ser. No. 754,842
Claims priority, application Germany Aug. 23, 1957
11 Claims. (Cl. 321-—7)
to 5%, of the nominal power rating of the saturable
transformers included in each system. As used herein
after the nominal power rating indicates the power rating
that the magnetic core of the saturable transformer can
handle. Second, the use of high-quality magnetic mate
rial having a substantially rectangular core loop is not
possible or practical since the curvature of the magnetiza
This invention relates to frequency changer systems, 10 tion curve or core loop is of importance in the operation
of a conventional frequency multiplier system as described.
and more particularly to frequency multiplier systems of
Therefore, low quality magnetic sheet steel must be used
the static type.
in a frequency multiplier system of the type described.
There are several conventional frequency multiplier
The latter factor and the mode of operation of a con
system including saturable transformers or reactors con
nected to a three-phase electrical power supply or to an 15 ventional frequency multiplier system, as described pro
hibits any appreciable increase in the voltage of the elec
trical power supply since such an increase might result in
electrical power supply having any number of phases.
For example, in one well-known system, the secondary
windings of saturable transformers are connected in series
with a load circuit to provide a single-phase voltage out
put having a frequency which is an odd-numbered multi
ple of the ‘frequency of the electrical power supply to
which the primary windings of the transformers are con
nected. Frequency transformation or multiplication in
the latter system is based on the fact that higher har
the destruction of the apparatus included in such a fre
quency multiplier system. Further there are other fac
tors which must be carefully considered in the operation
of a conventional frequency multiplier system as described,
such as the magnetic characteristics of the core included as
part of each saturable transformer, and the required
tolerances in the production of such apparatus.
It is an object of this invention to provide a new and
monics of a ?ux may be obtained by magnetizing saturable
improved frequency multiplier system.
transformers beyond saturation. The ?rst harmonics or
fundamental frequencies of the ?uxes and the voltages
induced in the secondary windings of the saturable trans
formers are arranged to cancel each other while the volt
ages induced by the higher harmonics of the ?ux provide
Another object of this invention is to provide a fre
quency multiplier system of the static type having a higher
efficiency.
A more speci?c object of this invention is to provide
an improved static frequency multiplier system including
a resultant voltage to a load circuit having a higher fre
saturable transformers and linear reactances.
A further object of this invention is to provide an
quency than the frequency of the electrical power supply.
If it is ‘desired to provide a single-phase output voltage
having a frequency which is three times or ?ve times that
of an electrical power supply, then a three-phase or ?ve
phase power supply must be provided and the third or
?fth harmonic of the induced flux in the saturable trans
formers included in a conventional frequency multiplier
system is utilized.
A second conventional frequency multiplier system does
alternating current output having a substantially rectangu
35
lar wave form from a source of alternating current.
Other objects of the invention will in part be obvious
and will in part appear hereinafter.
For a fuller understanding of the nature and objects of
the invention, reference should be had to the following
detailed description taken in connection with the accom
not require an electrical power supply having a large num
panying drawing, in which:
ber of phases. Instead this system may be employed with
a three-phase electrical power supply and saturable trans
of operation of the invention;
FIG. 1 is a schematic diagram illustrating the principle
FIGS. 2A and 2B graphically illustrate some of the volt
In this case the saturable 45 ages and currents associated with the schematic diagram
shown in FIG. 1;
transformers provide the required phase angle displace
FIG. 3 is a schematic diagram illustrating a frequency
ments of the ?rst harmonics or fundamental frequencies of
formers included in such a system are also employed as
phase changers or shifters.
the three-phase electrical power supply. The required
phase angle displacements of the fundamental frequency
may be expressed as a which is equal to
211'
n.
multiplier system embodying the teachings of this inven
tion;
FIG. 4 is a graph illustrating some of the voltages as
50 sociated with the schematic diagram shown in FIG. 3;
FIG. 5 is a schematic diagram of a second frequency
multiplier system embodying the teachings of the inven
tion; and
for the n-fold frequency or the frequency which is n
FIG. 6 is a schematic diagram similar to FIG. 1 show
times as great as the fundamental frequency of the three 55 ing the use of a different type of linear reactance.
phase electrical supply. In a frequency multiplier sys
Referring now to the drawing and FIG. 1 in particular,
tem of the second type, the resultant or the total second
there is shown a schematic diagram which illustrates gen
ary voltage is also obtained by saturation of the magnetic
erally the principle of operation of a frequency multi:
steel included in a saturable transformer and the utiliza
plier system embodying the teachings of the invention. A
tion of the harmonics of the ?ux induced in the saturable 60 source of alternating current (not shown) would be
transformers.
connected to the input terminals 10 and 12. The voltage
The conventional frequency multiplier systems described
associated with the source of alternating current or elec
above have several disadvantages which heretofore have
trical power system connected at the input terminals 10
and 12 is indicated as V5. In general, a saturable trans
made their practical application undesirable. First, the
3,048,765
3
4
former 40 and a reactance which is substantially linear,
at the terminals 20 and 22 for each half-cycle of the alter
nating current from the source connected at the input ter
minals 10 and 12. The circuit shown in FIG. 1 illus
trates a single phase of an over-all frequency multiplier
system as will be explained hereinafter.
speci?cally the reactor or inductance 30, are connected
in series circuit relationship across the input terminals
10 and 12.
In particular, the substantially linear reactor 30/ in
cludes a winding 32 disposed on a magnetic core 34 hav
ing an air-gap. The saturable transformer 40 includes a
primary winding 42, a secondary Winding 44, and a satura
ble magnetic core 46 on which said windings are disposed.
Referring now to FIG. 3 there is illustrated a frequency
multiplier system for supplying from a source of alternat
ing current to a load circuit, an alternating current out
put having a frequency which in this case is three times
The winding 32 of the reactor 30‘ is connected in series 10 the frequency of the alternating current from a polyphase
with the primary winding 42 of the saturable transformer
source (not shown) connected at the input or line ter
40, the series circuit being connected between the input
minals 110, 112 and 114. In general, the frequency multi
terminals 10 and 12. The secondary winding 44 of the
plier system, shown in FIG. 3, includes a plurality of
saturable transformer 40 is connected to the output ter
saturable transformers each having a primary winding and
minals 20 and 22 to provide output voltage impulses as in 15 a secondary winding, and a plurality of substantially linear
dicated by V1,. The saturable core 46 of the saturable
reactors with each of said reactors being connected in
transformer 40 is preferably formed from a magnetic ma
series between the primary winding of an associated satura
terial having a substantially rectangular core loop. For
ble transformer and one of the input terminals of a poly
reasons which will be explained hereinafter, the power
phase source of alternating current. The secondary wind
rating of the reactor 30 should be approximately equal 20 ings of the saturable transformers are connected in series
to the power rating of the saturable transformer 40‘.
circuit relationship with a load circuit including a load
The operation of the circuit shown in FIG. 1 can be
124 to provide an alternating current output having a
best understood by referring to the voltage and current
frequency which is greater than that of the source of alter
wave forms illustrated in FIGS. 2A and 2B. The voltage
nating current connected at the input terminals.
associated with the source of alternating current (not 25
In particular, the saturable transformers 140, 150 and
shown) connected at the input terminals 10 and 12 is in
160 include the primary windings 142, 152 and 162 re
dicated by the curve V5 and plotted as a function of time.
spectively, and the secondary windings 144, 154, and 164,
The current from the source of alternating current con
respectively. A substantially linear reactor 132 is con
nected at the terminals 10 and 12 is indicated by the
nected in series with the primary winding 142 of the
curve Is which is also plotted as a function of time. The 30 saturable transformer 140, the series circuit being con
output voltage impulses which appear at the output ter
nected between the input terminal 110 and a common or
minals 20 and 22, are indicated as Vm and VLZ during
neutral terminal 116. Similarly the substantially linear
successive half cycles of the supply voltage Vs as shown
reactors 134 and 136 are connected in series with the
in FIG. 2A and separately in FIG. 2B.
primary windings 152 and 162 of the associated saturable
In the absence of the saturable transformer 40 the 35 transformers 150 and 160, respectively, the series circuits
current ?owing through the reactor 30 would lag the
being connected between the input terminals 112 and 114,
voltage across the reactor 30 by substantially 90°. The
respectively, and the common or neutral terminal 116.
latter condition also prevails when the core 46 of the
The secondary windings 144, 154 and 164 of the trans
saturable transformer 40 is magnetized beyond its satura—
formers 140, 150 and 160 respectively, are connected in
tion value and the voltage drop across the primary wind
series circuit relation with one another, the series circuit
ing 42 is substantially negligible. When, however, the
being connected to the output terminals 120 and 122
current Is in the series circuit, which includes the reactor
across the load 124 to provide an alternating current out
30 and the primary winding 42 of the transformer 40, de
put having a frequency which is three times the frequency
creases to a low value or, as shown in FIG. 2A, ap
of the alternating current ‘from the three~phase source
proaches a zero value and begins to ?ow in the reverse
connected
at the input terminals 110, 112 and 114. The
direction, the core 46 of the transformer 40‘ is temporarily
connection of the primary windings 142, 152, and 162
in an unsaturated condition and a voltage impulse appears
of the transformers 140, 150 and 160 respectively, may be
at the output terminals 20‘ and 22 across the secondary
described also as a Y connection.
winding 44. In other words, while the core 46 of the
In general, each phase of the frequency multiplier
transformer 40 is saturated, substantially all of the sup
system, shown in FIG. 3, operates similarly to the circuit
ply voltage VS will be impressed across the reactor 30.
shown in FIG. 1 whose operation has already been ex
When the core 46 is unsaturated, substantially all of the
supply voltage V5 is impressed across the primary winding
42 of the transformer 40 and a voltage impulse appears or
is transmitted to the secondary winding 44 at the output
terminals 20 and 22, as indicated by the voltage im
pulses Vm and Vm during successive half cycles of the
plained. The over-all operation of the frequency mul
tiplier system shown in FIG. 3, is to provide an alternating
current output from a three-phase or polyphase source
of alternating current to a load circuit, the frequency of
the alternating current output ‘being three times as great
as the frequency of the three~phase alternating current
supply voltage VS as shown in FIGS. 2A and 2B.
at the input terminals and being single phase rather than
The average value or the voltage-time area of the volt
three-phase.
age impulses which appears across the secondary wind
Referring to FIG. 4 the operation of the frequency
ing 44 of the transformer 40‘ will have a magnitude which 60
multiplier system shown in FIG. 3 is illustrated. The
is equal to Z-N-BS-A, in which N is the number of turns,
curves VSA, VSB and Vsc represent the voltages associated
Bs is the saturation ?ux density, and A is the cross-section
with each phase of the alternating current from the source
a1 area of the magnetic steel included in the core 46.
connected at the input terminals 110, 112 and 114 plotted
Considering the latter relationship, it is to be noted that
the value of the supply voltage Vs has substantially no 65 as a function of time. As illustrated, the three-phase
voltages VSA, V513, and VSC differ in phase by substantially
in?uence on the output voltage impulses transmitted to
120 electrical degrees. The output voltage impulses
the secondary winding 44 of the saturable transformer 40.
which appear across the secondary windings 144, 154 and
Therefore, the voltage-time area of the voltage impulse
164 of the saturable transformers 140, 150 and 160 re
at the output terminals 20 and 22 is substantially in
dependent of variations in the supply voltage Vs. It is to 70 spectively, are represented by the curves VLA, VLB ‘and
be noted that the output terminals 20 and 22 would be
VLC, respectively. As illustrated in FIG. 4, the output
connected to a load circuit (not shown) connected at the
voltage impulses VLA, VLB and VLC are combined by
output terminals 20 and 22.
the connection of the secondary windings 144, 154 and
In summary, the circuit shown in FIG. 1 operates to
164 of the transformers 140, 150 and 160, respectively,
produce an output voltage impulse of alternating polarity 75 to provide an alternating current output having a sub
3,048,765
@
out of phase with the phase voltages at the terminals 201,
2% and 205. Each of the secondary windings of the
transformers 230 to 2841 provide output impulse Voltages
stantially rectangular wave form and having a frequency
which is three times that of the alternating current from
the three-phase source connected at the input terminals
110, 112 and 114. For example, if the frequency of
the alternating current from the three-phase source at
the terminals 110, 112 and 114 were 50 cycles per second,
which are combined by the series circuit connection to
form an alternating current output at the terminals 222 to
224 having a ‘frequency which is six times the frequency of
the ‘alternating current from the source connected at the
input terminals 201 to 206. The alternating current out
put supplied to the load 226 at the terminals 222 and
the frequency of the alternating current output supplied
to the load 124 at the terminals 129 and 122 will be 150
cycles per second. In other words, while the primary
windings 142, 152 and 162 are arranged in a Y connec
10 224 would of course be a single phase alternating phase
output rather than a polyphase output.
It is to be understood that capacitors may be substi
tuted for the substantially linear reactors shown in FIGS.
154 and 164 are connected so that the output voltage
1, 3 and 5 in providing a frequency multiplier system
impulses across each of said secondary windings are
combined to provide an alternating current output to the 15 embodying the teachings of this invention. Referring to
FIG. 6, there is shown a schematic diagram of a circuit
load 124 having a higher frequency than that of the alter
similar to that shown in FIG. 1 in which a capacitor 30'
nating current from the three-phase source.
is substituted for the reactor 30 shown in MG. 1. It is
Referring to FIGS. 3 and 4, it is to be understood that
tion to be connected to a three-phase source at the ter
minals 110, 112 and 114, the secondary windings 144,
the circuit shown in FIG. 3 may be provided to obtain
obvious that the embodiments of FfGS. 3 and 5 could be
modi?ed similarly. If capacitors are employed, however,
a substantially rectangular alternating current output from
in a frequency multiplier system as disclosed, self-oscilla
the three-phase source connected at the input terminals
tion may result during operation of such a system when
110, 112, and 114- by ‘reversing the connections of one
the system is operating at or near a no-load condition.
of the secondary windings of the saturating transformers
When the system is operating with a substantial load,
140, 150 and 160. For example, if the connection of
the secondary winding 144 of the transformer 14% were 25 however, such oscillations are suppressed through the ef
fective damping, in which case the comparatively large
reversed the output voltage impulse VLA would be reversed
reactors may be replaced by capacitors without any risk.
in polarity for a particular half cycle of the supply phase
The apparatus and circuits embodying the teachings
voltage VSA or substantially 180° in phase, so that a
of this invention have several advantages. For example,
substantially rectangular single-phase output voltage
would be provided across the load 124 at the terminals 30 a frequency multiplier as disclosed allows a great utiliza
tion of the inherent or built-in power rating of the appa
120 and 122. The frequency of the latter output voltage
ratus included in the system. It has been found if a fre
would be the same as the frequency of the alternating
quency multiplier system as disclosed is connected to a
current from the source connected at the input terminals
three-phase electrical power supply, the secondary power
110, 112 and 114. In the latter arrangement the sub
stantially rectangular alternating current output would 35 output is three times as great as that of a conventional
frequency multiplier system as previously described. In
include slightly undulating peaks.
such a comparison, it is assumed that the power rating of
the saturable transformers and the series-connected re
actors is equal to the power rating of the saturable trans
this invention. In general, the frequency multiplier sys
tem, shown in FIG. 5 provides an alternating current 40 formers alone included in a conventional frequency multi
plier system as described. The utilization of the power
output to a load circuit having a frequency which is six
rating of the apparatus included in a system as disclosed
times that of the alternating current from the source
can be further improved by including in the saturable
connected at the input terminals 201, 2432, 263, 264, 205,
transformers a core made from a magnetic material hav
and 206.‘ The frequency multiplier system, shown in
ing a substantially rectangular core loop. The latter ma
FIG. 5 is similar to the frequency multiplier system
terial can be employed in a saturable transformer in a
shown in FIG. 3, except that a six-phase alternating cur
system as disclosed since a different mode of operation is
rent input would be required and the frequency of the
involved compared to a conventional frequency multiplier
alternating current input would be twice as ‘great as the
system as described. It has been found that a frequency
output of the system shown in FIG. 3.
multiplier system as disclosed requires a total power rat
In particular, the frequency multiplier system shown
ing of the apparatus included in the system which is only
in FIG. 5 includes a plurality of saturable transformers
?ve times as much as the secondary power output re
230, 249, 250, 264i, 270 and 2% and a plurality of sub
Referring now to FIG. 5 there is illustrated a second
frequency multiplier system embodying the teachings of
stantially linear reactors 219, 211, 212, 213, 214 and 215.
The saturable transformers 230, 24th, 25d, 26%, 271i and
280 include the primary windings 232, 242, 252, 262,
272, ‘and 282 and the secondary windings 234-, 244, 2%4,
264, 274 and 284, respectively. Each one of the reactors
210 through 215 is connected in series circuit relation
with one of the primary windings, 232, 242, 252, 262, 272
and 282 respectively, of the associated saturable trans
formers 230 to 281) respectively, each of the series circuits
being connected between one of the input terminals 2411
to 206, respectively, and the common or neutral terminal
quired.
A second advantage of a frequency multiplier system
as disclosed is that the secondary or output voltage is
largely independent of the load current as well as being
independent of variations in the supply input line voltage
over a rather wide range of load currents.
This is be
cause the mode of operation of the disclosed frequency
multiplier system is based on the principle of transform
ing output voltage impulses, whose magnitude is depend
ent only upon the dimensions of the saturable transformers
and the properties of the magnetic material from which
the cores of the transformers are made as well as upon
207. The secondary windings 234, 244, 254, 264, 274, 65 the input frequency of the alternating current. It has
and 284 of the saturable transformers 23% to 284' respec
tively, are connected in series circuit relationship, the
series circuit being connected to the output terminals 222
and 22.4 across the load 226.
been found that tolerances in production have but slight
effect on the operation of a frequency multiplier system
as disclosed.
Because of its simple construction and larger power
In operation the frequency multiplier system shown in 70 capacity, a frequency multiplier system as disclosed is par
FIG. 5 operates similarly to the frequency multiplier
ticularly suitable as an input source for magnetic ampli
system shown in FIG. 3 except that a six—phase alternat
ing current source (not shown) is connected ‘at the input
terminals 201 to 2%. The phase voltages associated
with the terminals 202, 204 and 2% are substantially 180° 75
?ers since it is well-known that the time-constant of a
magnetic ampli?er is reduced with an increase in the fre
quency of the supply voltage. Other applications of a
frequency multiplier system as disclosed include the sup
3,048,765
7
8
ply of small synchronous and asynchronous motors, par
of said source and the associated primary winding, the
ticularly those for use with machine tools, gyrocompasses
and the like.
Since numerous changes may be made in the above
described apparatus and circuits, and different embodi
ments of the invention may be made without departing
from the spirit thereof, it is intended that all the matter
contained in the foregoing description or shown in the
accompanying drawings shall be interpreted as illustrative
primary windings of said transformers being connected
and not in a limiting sense.
I claim as my invention:
1. In a frequency multiplier system for providing an
increased frequency from a polyphase source of alternat~
ing current to a load circuit, the combination comprising,
a plurality of saturable transformers each having a pri
mary winding, a secondary winding and a magnetic core
formed from a magnetic material having a substantially
rectangular core loop, and a plurality of substantially
linear reactances, each of said reactances being connected
between one phase of said source and a primary winding
of one of said saturable transformers, the secondary wind
ings of said transformers being connected in series with
said load circuit to provide an alternating current output
having a substantially rectangular waveform and having
an increased frequency to said load circuit.
2. In a frequency multiplier system, the combination
comprising a polyphase source of alternating current, a
plurality of saturable transformers each having a primary
winding, a secondary winding and a magnetic core formed
from a magnetic material having a substantially rectangu
in Y and the secondary windings being connected in
series with a load circuit to provide an alternating cur
rent output having a frequency substantially three times
that of said source.
6. In combination, a polyphase source of alternating
current, a plurality of saturable transformers each having
a primary winding, a secondary winding and a magnetic
10 core formed from a magnetic material having a substan
tially rectangular core loop, and a substantially linear
reactance associated with each primary winding and con
nected between one phase of said source and the associ~
ated primary winding, the secondary windings of said
transformers being connected in series with at least one
of said windings being reverse connected to provide an
alternating current output of the same frequency as said
source and having a substantially rectangular waveform.
7. In a frequency multiplier system, the combination
comprising a polyphase source of alternating current, a
plurality of saturable transformers each having a pri
mary winding, a secondary win-ding and a magnetic core
formed from a magnetic material haveing a substantially
rectangular core loop, and a plurality of substantially
linear reactances, each reactance being associated with a
primary winding of a saturable transformer and including
a magnetic core, the power rating of each saturable trans~
former being approximately the same as that of the asso
ciated reactance, the primary windings of said saturable
transformers each being connected in circuit relation with
lar core loop, and a plurality of reactances, each react
one phase of said source through one of said linear react
ance being substantially linear, one of said reactances
ances, the secondary windings of said saturable trans
being connected between each phase of said source and a
formers being connected in series circuit relation to pro
primary winding of one of said saturable transformers,
vide an alternating current output having a frequency
the secondary windings of said transformers being con 35 higher than that of said source.
nected in series to provide an alternating current output
8. In a frequency multiplier system for providing an
having a frequency greater than that of said source, and
increased frequency from a polyphase source of alternat
a load circuit connected to the output of said secondary
ing current to a load circuit, the combination comprising,
windings.
a plurality of saturable transformers each having a pri
3. In a frequency multiplier system, the combination
mary winding, a second winding and a magnetic core
comprising a polyphase source of alternating current, a
formed from a magnetic material having a substantially
plurality of saturable transformers each having a primary
rectangular core loop, and a plurality of substantially
winding, a secondary winding and a magnetic core formed
linear reactances, each of said linear reactances compris
from a magnetic material having a substantially rec
ing a capacitor, each of said reactances being connected
tangular core loop, and a plurality of reactances each hav
between one phase of said source and a primary winding
ing a substantially linear reactance and comprising an
of one of said saturable transformers, the secondary
inductance including a magnetic core having an air-gap,
windings of said transformers being connected in series
one of said reactances being connected between each
with said load circuit to provide an increased frequency
phase of said source and a primary winding of one of said
to said load circuit.
saturable transformers, the secondary windings of said 50 9. In a frequency multiplier system for providing an
transformers being connected in series to provide an alter
output having a higher frequency to a load circuit from
nating current output having a frequency greater than
a polyphase source of alternating current, the combina
that of said source, and a load circuit connected to the
tion comprising, a plurality of saturable transformers each
output of said secondary windings.
having a primary winding, a secondary winding and a
4. In a frequency multiplier system for providing an
magnetic core formed from material having a substantially
output having a higher frequency to a load circuit from
rectangular core loop, and a substantially linear reactance
a polyphase source of alternating current, the combina
comprising a capacitor associated with each primary wind
tion comprising, a plurality of saturable transformers each
ing and connected between one phase of said source and
having a primary winding, a secondary winding and a
the associated primary winding, the secondary windings
magnetic core structure formed from material having a
of said saturable transformers being connected in series
substantially rectangular core loop, and a substantially
with said load circuit to provide an alternating current
linear reactance associated with each primary winding and
output having a frequency higher than that of said source.
connected between one phase of said source and the asso
10‘. In combination, a polyphase source of alternating
ciated primary winding, the secondary windings of said
current, a plurality of saturable transformers each having a
saturable transformers being connected in series with said
primary winding, a secondary winding and a magnetic
load circuit to provide an alternating current output hav
core formed from a magnetic material having a substan
ing a substantially rectangular waveform and a frequency
tially rectangular core loop, and a substantially linear
higher than that of said source.
reactance comprising a capacitor associated with each pri
5. In a frequency tripler system, the combination com
mary winding and connected between one phase of said
prising, a three-phase source of alternating current, three 70 source and the associated primary winding, the secondary
saturable transformers each having a primary winding, a
windings of said transformers being connected in series
secondary winding and a magnetic core formed from a
with at least one of said windings being reverse connected
magnetic material having a substantially rectangular core
to provide an alternating current output of the same fre
loop, and a substantially linear reactance associated with
quency as said source and having a substantially rec
each primary winding and connected between one phase 75 tangular waveform.
3,048,766
10
11. In a frequency multiplier system, the combination
substantially rectangular waveform and a frequency
comprising a polyphase source of alternating current, a
greater than that of said source, and a load circuit con~
plurality of saturable transformers each having a primary
nected to the output of said secondary windings.
winding, a secondary winding, and a magnetic core formed
from a magnetic material having a substantially rectangu 5
lar core loop, a plurality of substantially linear reactances
each comprising a capacitor, one of said reactances being
connected between each phase of said source and a pri
mary winding of one of said saturable transformers, the
secondary windings of said transformers being connected
in series to provide an alternating current output having a
10
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,180,800
Taylor ______________ __ Apr. 25, 1916
2,727,159
2,820,942
Sunderlin ___________ __ Dec. 13, 1955
Depenbrock _________ __ Jan. 21, 1958
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