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Патент USA US3030536

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April 17, 1962
A. FUKS
3,030,526
APPARATUS FOR PRODUCING A PULSATING CURRENT
Filed Nov. 14, 1957
INVENTOR.
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fat,
BY
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71.1,“ ‘g
United States Patent O??ce
3,030,526
Patented Apr. 17, 1962
1
2
3,030,526
FIG. 2 illustrates diagrammatically another embodi
ment of the invention; and
FIG. 3 illustrates diagrammatically a component of
APPARATUS FOR PRODUCING A PULSATING
URRENT
Alexandre Fuks, Paris, France, assignor to Societe
Parlsienne d’Exploitation des Etablissements Georges
Du?ot, Paris, France
Filed Nov. 14, 1957, Ser. No. 696,486
Claims priority, application France Nov. 15, 1956
6 Claims. (Cl. 307-132)
FIGS. 1 and 2.
Referring now to FIG. 1, the apparatus in this embodi
ment of the invention comprises input means for an A.C.
current, consisting of a transformer 1 having a primary
winding connected to a line supply of A.C. current, while
there are two secondary winding portions which furnish
10 a high voltage current by way of the connections 3 and 4,
The present invention concerns an apparatus for pro
ducing a pulsating current of varying frequencies, and
more particularly a pulsating current the frequency of
respectively, to the valve electrodes of the recti?er tube
2. The center tap between the secondary winding por
tions is connected to an output connection 5.
The whole arrangement described so far constitutes
vals and for predetermined durations. Pulsating currents 15 a recti?er arrangement of generally known type.
of this type have a particular application in the ?eld
‘ It is, therefore, evident that in operation the branch
which varies in a predetermined manner at certain inter
of electro-medical treatments.
connections 3 and 4 will be passed by a pulsating current
As a matter of fact it is often desirable in certain thera
peutical and diagnostic processes or methods to use pul
having only half-wave pulses of like polarity and spaced
from each other by a half cycle, the frequency of the
sating currents varying from time to time in frequency, 20 pulses in these two lines 3 and 4 being equal to the basic
and having intervals without pulses and of varying dura
frequency of the A.C. current introduced into the trans
tion. In this manner it can be avoided that the person
former 1. However the output connection 5 will carry
treated by these currents develops a habitual condition
a sequence of half-wave pulses which are the combina
,Ji
which could easily occur unless the above-mentioned
tion of the pulsating currents in the lines 3 and 4 and
changes in variation are provided for.
25 therefore has a pulse frequency twice the basic frequency
It is a main object of this invention to provide for a
of the AC. input current. Assuming, for instance, that
method and apparatus for producing the type of current
the A.C. input has a frequency of 50 cycles per second
described above in the most simple and e?icient manner.
then the frequency of the pulsating current in the output
With above objects in view, an apparatus according to
connection 5 would be 100 cycles per second.
the invention mainly comprises input means for an A.C. 30
According to the invention means for interrupting the
current of chosen basic frequency; circuit means con
nected with the input means and comprising several com
ponents, namely at least two branch connections for
carrying each a series of half-wave pulses of like polarity,
the series in one branch connection being offset in phase
relative to the series in the other branch connection, and
an output connection for carrying a sequence of half
Wave pulses being the combination of said series of pulses;
?ow of said pulsating currents are provided. One pre
ferred example of an interrupter is illustrated diagram
matically in FIG. 3. This interrupter is actually a sort
of switch means having a movable member 6 which is
movable with respect to a stationary terminal C and has
a free end that is able to make contact alternatively with
one or the other of two stationary contacts D1 and D2.
The member 6 is urged by bias means Z towards the left,
valve means located in each of said branch connections
as seen in FIG. 3, so as to engage with one portion there
for allowing only a half-wave of said A.C. current to 40 of the raised cam portions of a rotary cam carrier 7.
pass through the particular branch connection; electron
When during the rotation of the carrier 7 any one of its
tube means located in said components of said circuit
cams engages a cam follower portion of the switch mem
means and including valve members in circuit with said
ber 6, the connection between the terminals C and D2 is
closed. However, when there is no engagement between
wave pulses of like polarity to pass through said branch
the above-mentioned parts then the circuit is closed be
45
connections, respectively, and variable resistance means
tween terminal C and terminal D1. The rotational speed
branch connections, respectively, for allowing only half
in circuit with at least one of said components for tem
porarily suppressing the ?ow of said pulses in the respec
tive component, said variable resistance means compris
of the cam carrier 7 may be chosen arbitrarily to suit the
purpose set forth in the ?rst paragraph of this speci?ca
tion. The individual cams along the circumference of the
ing a cathode and an anode spaced from each other so
carrier 7 may be provided with the same or different cir
as to establish a resistance across the gap between them, 50 cumferential dimensions and like wise the spacing between
a grid adjacent to said cathode and anode, and means for
consecutive cams may be chosen to suit the desired condi
applying a variable bias potential to said grid for corre
tions. The number of cams it not limited and they may
spondingly varying said resistance across said gap at pre
be distributed in any desired manner.
determined intervals and for predetermined durations, so
interrupter means consisting mainly of a triode 25
that a predetermined sequence of periods of varying cur 55 connected, in series with a resistor 23, between the cathode
rent conditions appears in said output connection, the
of the recti?er tube 2 and the output connection 5. Ter
minals 24 connected with one end of resistor 23 and with
a movable tap thereof, respectively, are the output ter
minals of the arrangement.
60
twice said basic frequency, depending upon in which one
If in the above-described arrangement a manually op
of said components the ?ow of pulses is suppressed.
erable switch 12 is placed in the branch connection 4 then
The novel features which are considered as character~
the operation can be controlled in the following manner.
istic for the invention are set forth in particular in the ap
As long as the connection 4 is interrupted by opening the
pulse frequency of the current therein varying from period
toperiod between Zero pulses, a pulse frequency equal
to said basic frequency, and a pulse frequency equaling
pended claims. The invention itself, however, both as to
switch 12, the output of pulsating current (in the above
its construction and its method of operation, together 65 example of 50 c.p.s. input) will vary from period to
with additional objects and advantages thereof, will be
period alternatively between a frequency of 50 pulses
best understood from the following description of spe
when tube 25 is conducting and 0 pulse when it is not
ci?c embodiments when read in connection with the ac
companying drawings, in which:
conducting because evidently during the interruption of the
?ow of pulses through the connection 5, 25, 23 no cur
‘ FIG. 1 illustrates an embodiment of the invention in 70 rent whatsoever can be furnished at the output terminals
the form of a diagram; and
24 at all.
3,030,526.
output of pulsating current will vary from period alter
natively to period between the frequency of 100 pulses
persecondrwhen tube-2; is conducting, and O‘iWhBD it is
not conducting.
,
4
It will benotedthat in.‘ any case. the, strengths. or the
amplitudes of the pulsations delivered through either one
‘If oaths other. hand. the switch 12 is closed then the‘
of the branch connections 3‘ or 4 can be adjusted by
means of the variable resistors 14, 29, and in this manner
another variation of the, circuit conditions can be intro
7
duced in a very simple manner so that the amplitude of ,
It: has been found that in certain cases it is desirable
that the transition from one form of current to the other‘
one series of half-wave pulses is different from or equal
i.e_. from one frequency of pulsesto another frequency of
to that of the other series of half-wave pulses. 'Again the
adjustment of the variable resistors 11, 14,‘ 23, 28, and
‘ pulsesbe performed more gradually.
29 may be changed periodically or in any desiredmanner
'In- order to make this possible, the electron tube 25,
mentioned above is employed in such a manner that in
terrupter means are constituted by the variable resistance
by mechanicalmea'ns generally similar to the devicecom
posed of members 6‘ andt7.
If the switch member 6 of FIGS. 1 and 2 is operated t
existing between theanode and cathode of the tube, the
by a cam carrier 7 as shown at. a larger scale in_Fl,,G._ 3,
resistance being variable by means of a control grid lo
cated adjacent to the gap between said anode and cathode, 15 then of course after every full revolution of, this cam.
carrier the same cycle of,v operations of the switch'mem
provided that the bias potential impressed on such a grid
her 6 would repeat. In order to preventtsuch a repeti
is changed in accordance with the requirements cor
tion andin order to introduce even more variationsin the.
responding to the object of the present invention.
type of pulsations‘received at the outputof theapparatus,
FIGS. 1 and 2 illustrate diagrammatically two such em
bodiments ofthe invention.
,
Instead of the illustrated ‘recti?er tube other known de
vices of equivalent function could be used like an arrange
20 a number of different cam carriers may be put to work,
so as to‘act injsuccession to each other,va mechanically
driven, commutator or switching apparatus serving, to,
alternatingly put to work one or the‘ other, of these cam:
ment oftwo diodes, or two triodes, a double diode or a
carriers,
It will be understood that each of, the, elements de
For the above mentioned purpose a condenser 26 is 25
double triode.
'
scribed, above, or two or more together, may‘ also ?nd, a,
connected in a grid circuit between the gridlof the tube
25 and its cathode. The condenser 26 is connected in
series with an auxiliary control circuit which has two
branches, with one switch member 6 arranged to- alter
useful application in other types of method and appa
ratus for producing apulsating current, differingfrom the
types described above.
While the inventionhas been illustrated and described
natively connect one or the other of these two branches 30
into this circuit.
as embodied» in method and apparatus for producing a
The one branch is a resistor 11 which]
pulsating current‘ of varying frequencies, it is not in
is preferably adjustable. The other branch is, a similar
resistor 28 which is also adjustable and is connected in
tended to be limited to the details shown,,since various
modi?cations and structural changes may be made without,
tery 100. A potentiometer 29 in parallel with the battery 35 departing in any way from the spirit of, the present in
100permits to adjust the potential applied to the adjust
vention.
Without further analysis, the foregoing will so fully
able resistor 23. Itis, evident that by alternatingly mov
reveal the gist of the present invention that others can
ingthe switch member 6 into one or the other of its above
by applying current knowledgereadily adapt it, for Varimentioned positions the condenser 26 is alternatingly
charged and discharged, the speed of this discharge and 40 ous applications without omitting features that, from;the
series with a source of DC. potential illustrated as a bat
charge being predetermined by thetsettings of the adjust
standpoint of. prior art, fairly constitute essential char
ment means controlling the variable resistors 11, 28, and
2,9. Theswitch member 6 is of the type illustrated in
FIG. 3.
Accordingly, in operation the condenser 26 will be
acteristics of the generic or__ speci?c aspects of thisinvene
tion and, therefore, such adaptations shouldltandjare in
charged and discharged in predetermined intervals ac
tended to be comprehended within the, meaning and range,
45
cording to the arrangement of camson the actuator 7
of equivalence of the followingtclaims,
What is claimed as new, and desired to- be secured by
Letters Patent is:
1. Apparatus for producing apulsating lcurrent of vary
V for the switch member 6. In this case, depending upon
the arrangement of cams, the tube 25 will act as a con
ductor or as a non-conductor in the cathode circuit of the
ing frequencies,comprising,in combination, inputmeans
for an AC. current of chosen basic, frequency; circuit;
recti?er 2. Consequently, the operation of the apparatus 50 means connected with saidinput means and comprising.
illustrated by FIG. 1 will be generally the same as if the
interrupter according to FIG. 3 were inserted in the out
several components, namely at least two branch ‘:Q?uec-v ,
tiOns for carrying’ each a series, of‘ half-Wave pulses of;
put connection 5. However, the transition between one
like polarity, the series in one, branch connection being
mode of operation and the other isv gradual according to 55 offset, in phase relative to the series in the other, branch
the chosen settings of the adjustable resistors.
connection,_and anoutput connection for carrying a se
quence of half~wave pulses being the combination of,’
FIG. 2 illustrates a modi?cation of the previous ar
saidseries of pulses; electron tube means located in said,
components, of said circuit meansv and including valve
odes whereoflare connected with each other and jointly 60 members in circuit with said branch, connections, re
spectively, for allowing only; half-wave pulses orfrlike,
connected tovthe output resistor 23_ described above. In
polarity tov pass through said. branch connections, re’
the, example of FIG. 2 the circuit described below and
rangement. In this case the recti?cation is carried. out
by two-separate triodes 2a and 2b, respectively, the oath
spectively, and variable resistancemeans in: circuitpwith:
containing the condenser 26, they switch means 6, the
source of’ DC. potential 100 and the variable. resistors
ll, 28 and,2,2,_is applied only tothe tube 2a. The grid
circuit of theother tube 212 contains a switchlz' and a
variable, potential taken from the source 15 via an ad
at leastv one of said components fcmtemporarilyv suppres
65
sing the iiow of said pulses in the,respectivecornponent,
saidvariableresistance means comprisingua' cathode and, "
an anode spaced from eachioth?r so as to establish a
resistance across thegap betweentthem, av gridadjacent
to saidv cathode and anode, and means for-‘applying a
adjust the strength of the pulsations obtained through the
branch connection, 3 and thetubc 2b. The‘ switch 12 70 variable bias potential to said grid for correspondingly.
varying said resistance across said gap at predetermined;
couldlbe also actuated in the manner described above with
justable resistor 14.- The variable resistor 14 permits to
respect to the switch 6. Onjthe other hand it is quite
as well possible to equip the tube 2b with exactly the
intervals and for predetermined, durations, so that a pre
determined sequence of periods of varying currentcon~
ditions, appears in saidioutput connection, the, pulse fre
same controlmeans as those shown and described with
respect to the grid control of the tube 2a.
' 75 quency of the current therein. varying from,‘ period to.
3,030,526
5
6
period between zero pulses, a pulse frequency equal to
said basic frequency, and a pulse frequency equalling
other branch, or discharged across said resistance in said
twice said basic frequency, depending upon in which one
of said components the ?ow of pulses is suppressed.
2. Apparatus for producing a pulsating current of
4. Apparatus for producing a pulsating current of vary
ing frequencies as set forth in claim 3, wherein said re
sistances and said source of DC. potentials are adjustable
varying frequencies as set forth in claim 1, wherein said
means for applying a variable bias potential to said grid
for predetermining the characteristics of the grid bias
one branch.
changes during said charging and discharging operations.
5. Apparatus for producing a pulsating current of vary
said cathode and said grid, and means for causing alter
ing requencies as set forth in claim 3, wherein said means
nating charges and discharges of said condenser so that 10 for actuating said switch means is a rotatable cam mem
the bias potential of said grid varies corresponding to the
ber having a plurality of raised cams engaging said switch
varying potentials at the terminals of said condenser.
member for urging the latter from one position to the
3. Apparatus for producing a pulsating current of vary
other, said cams having predetermined circumferential
ing frequencies as set forth in claim 2, wherein said means
lengths and intervals therebetween corresponding to the
include a condenser connected in a grid circuit between
for‘causing alternating charges and discharges of said 15 desired periods of charging and discharging said con
condenser include a control circuit in series with said
condenser, said control circuit comprising two branches
and a switch means movable between two positions alter
natively connecting one or the other branch in series with
denser.
6. Apparatus for producing a pulsating current of vary
ing frequencies as set forth in claim 1, wherein said
electron tube means comprise two triodes, the cathodes of
said condenser, a predetermined resistance in one of said 20 which are connected to form a combined second output
branches, and a predetermined resistance and a source of
DC. potential in the other one of said branches, and
connection, said triodes acting simultaneously as valve
means and as variable resistances.
means for actuating said switch means to move between
said positions at predetermined intervals and for predeter
mined durations, so that depending upon the position of 25
said switch means said condenser is charged by said
source of DC. potential across said resistance in said
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,465,838
Bernard _____________ __ Mar. 29, 1949
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