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Патент USA US2405237

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Patented Aug. 6, 1.946
2,405,237
UNITED STATES PATENT OFFICE ,
ELECTRONIC TRIGGER CIRCUIT WITH
THEE-DELAY
Arthur J. Ruhlig, Washington, D. C.
Application October 4, 1941, Serial No. 413,694
5 Claims.
(Cl. 250-27)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757‘
1
2
This invention relates to electrical apparatus
for generating rectangular pulses, and more par
ticularly to an apparatus for producing a rec
tangular pulse upon application of a single mo
eluding novel means wherein the potential of
the output terminal abruptly changes, upon ap
plication of a momentary voltage at the input
terminal, to a value independent of the applied
voltage, and wherein the potential of the output
mentary pulse thereto.
Various electrical apparatus have been provided
heretofore, such as non-oscillating multivibrators,
terminal remains at such value for a predeter~
mined period of time determined by certain com
for generating a pulse upon application of a single
ponents of the apparatus.
momentary pulse to the circuit. However, the
Still another object is to provide an electrical
apparatus including a pair of electron discharge
devices interconnected in such a manner whereby
the potential of the devices is normally main
tained at- a predetermined value, and wherein the
potential of one of the devices abruptly varies
upon application of a single momentary pulse
prior arrangements are not adequate in that the
magnitude and time-interval of the produced
pulse is either dependent upon the character of
the applied pulse or is so limited by inherent char
acteristics of the circuit that a pulse suitable for
numerous applications cannot be obtained there
‘
by. Moreover, the circuits of the prior apparatus
are extremely complex which tends to produce
,\ thereto‘to abruptly vary the potential of the other
device to a second predetermined value.
excessive regenerative action therein as well as
Other objects and features of the invention will
appear more fully from the following detailed
reducing the ei?ciency and reliability of the ap
paratus.
20
description when. considered together with the
It is therefore an object of the present inven
accompanying drawing which disclosed one em
tion to provide an electrical apparatus of such
bodiment of the invention. It is to be expressly
construction to overcome the disadvantages enu
understood, however, that the drawing is designed
merated heretofore.
for purposes of illustration only, and not as a
Another object‘is to provide an electrical ap 25 de?nition of the limits of the invention, reference
paratus having novel means for producing, a rec
being had to the appended claims for the latter
tangular shaped pulse upon application of a single
purpose.
momentary pulse thereto.
Another object is to provide in an electrical ap
paratus of the above character novel means for
determining the time-interval of the produced
pulse independently of the applied pulse.
Another object is to provide an electrical ap
paratus of comparatively simple construction for
reliably producing an electrical impulse upon ap
plication of a single momentary pulse to the cir
cuit.
In the drawing:
'
'
Fig. l is a schematic illustration of an elec
trical apparatus embodying the principles of the
present invention;
Fig. 2 shows the voltage curve of a pulse pro
duced by the apparatus disclosed in Fig. 1, and
. Fig. 3 shows the voltage curve of the single
, momentary pulse applied to the apparatus shown
in Fig. 1 to cause generation of the pulse dis
closed in Fig. 2.
Still another object of the invention is to pro
Referring more particularly to Fig. l of the
vide an apparatus of the above type wherein the
drawing, an electrical apparatus embodying the.
magnitude and time-interval of the produced 40.. principles of the present invention is disclosed
pulse are independent of similar characteristics
therein including a pair of electron discharge
of the applied pulse.
_
devices I0 and I I, of the triode type, each respec
Still another object is to provide an electrical
tively having a cathode I2 and I3, an anode I 4
apparatus of the foregoing character wherein the 1
and I5, and a control electrode i6 and I1. When
magnitude and time-interval of the produced e a more compact arrangement is desired, the elec
pulse is determined by certain components of the
trodes of devices I0 and II may be included in a
apparatus and which may be easily varied
single envelope, such as a duplex-triode, for ex
throughout wide limits.
ample. ‘I‘he cathodes I2 and I3 are connected to
Still another object is to provide an electrical
gether and are in turn connected to ground po
apparatus for generating an electrical pulse upon
tential through common resistance I8, whereas
application of a single momentary pulse thereto
the anodes of each of the devices are maintained
of such construction to reduce regenerative ac
positive‘ with respect to the cathodes by map
tion to a minimum.
Still another object is toprovide an electrical
apparatus having input and output terminals in
propriate source of potential I9, the positive ter
minal of which is connected to anodes I4 and I5
through, resistances 2B and 2| respectively.w Con- -
2,405,237
'
K '
3
4
trol electrode l6, of device 10,, is connected to
ground potential through resistance 22, while
control electrode 11 is connected to the positive
terminal of source I9, through variable resistance
decrease to a substantially zero value after lapse
of such predetermined period of time. As shown
in the drawing, such means includes capaci
tance 24 and resistance 23, which function to
23, in order that devices It and H may be con
maintain control electrode H su?iciently nega
tively biased, following the ?ow of the large nega
tive pulse thereto, for a period of time equal to
the product of the values of the capacitance and
trolled.
For a purpose that will appear more
fully hereinafter, control electrode I‘! is also con
nected to anode M, of device I0, through capaci
tance 24. An input terminal 25 is connected to
resistance. The capacitance and resistance are
the cathodes through suitable capacitance 26, and 10 to be selected to provide the time-delay desired,
an output terminal 21 is provided which is con
or to determine the time-interval during which it
nected between anode l5 and resistance 2!, thus
is desired to maintain the output terminal at a
segregating the same from other components of
high potential. During such time interval the
the circuit to thus reduce regenerative action to
negative bias on control electrode I‘! gradually
‘
>
15 leaks o?, and after lapse of the predetermined
With the foregoing construction, a positive bias
period of time, the control electrode will be
is normally maintained on control electrode ll of
driven positive, which abruptly allows device H
such value that device I i draws current, and re
to again draw current. At the instant device H
sistance 2| is selected to provide a drop in po
commences to’ draw current the potential at the
tential at anode l5 whereby the potential of out 20 output terminal abruptly drops to a substantially
put terminal 21 will normally be maintained at
zero value, because of the drop of the voltage at
a substantially zero value. Resistance 18 is prop
resistance 2|. Resistance 23 may be of the vari
erly selected to provide a drop in potential at
able type, if desired, so that the time-interval
of high potential at output terminal v2'! may be
control electrode l6,‘ when device [I draws cur
rent, so that control electrode 16 is normally
manually varied throughout certain limits. Dur
biased to a su?icient negative value to cut oil
ing the time-interval when device I I is not pass
device l0 and thus prevent anode M from draw
ing current, there will be a small drop of voltage
ing current. Anode l4, therefore, will normally
at resistance 18, and consequently device It) will
be maintained at high potential, substantially
be drawing current throughout such interval.
equal to the potential of source I9.
However, at the instant device ll again com
As heretofore stated, the present invention pro
mences to pass current, the drop in voltage at
vides means for abruptly varying the potential
resistance l8 will increase to thereby cause de
of device I0 upon application of a singlemomen
vice IE to return to the normal state wherein
tary pulse atinput terminal 25, to abruptly vary
no anode current is ?owing and the anode is
the potential of device H, and hence output ter 35 maintained at a high potential, substantially
minal 21, to a second predetermined value. It
equal to the potential of source l9.
aminimum.
has been found when a single momentary nega
tive pulse, of any suitable magnitude greater than
a few volts, is applied to input terminal 25, the
potential di?erence between control electrode it
and cathode I2 suddenly changes and allows de
vice lll to abruptly draw current. At the instant
With reference to Figs. 2 and 3, curves of the
output and input voltages, and the relationships
therebetween are respectively shown. The poten
tial of the output terminal is shown at a sub
stantially zero value until the input voltage is
impressed on the circuit, at which instant, the
output voltage abruptly increases to a predeter
current ?ows in device ID a sudden drop in po
tential at anode l4 occurs because of the drop
mined value, determined by certain components
of the voltage at resistance '20. The extent of 45 included in vthe circuit, independently of the
such potential drop at anode i4 depends upon
resistance 20, which is to be of such value as to
provide a comparatively large drop in potential
following the instant the input pulse is applied
to the input terminal. At the instant the poten 50
magnitude of the input voltage. The output volt
age then remains substantially constant at the
high value for a predetermined time-interval T,
such interval being determined by the product
of the value of capacitance 24 and resistance 23.
When time-interval T lapses, the output voltage
abruptly drops to a substantially zero value, and
remains at such value until a momentary input
tial of anode 14 drops a large negative pulse is
transferred through capacitance 24 to control
electrode ll, of device H, to drive the control
electrode su?iciently negative to abruptly out off
voltage is again applied to the circuit, in which
this device and abruptly terminate the flow of 55 case the foregoing operation would reoccur.
From the above it can be readily seen that the
anode current. When the device H ceases to
output voltage, or the potential of the output
draw current the potential of anode l5, and hence
thepotential of output terminal 21, will abruptly
terminal, is entirely independent of the char
acteristics of the input voltage, the latter only
high value substantially equal to the potential of 60 functioning as a trigger to initiate generation of
the output pulse,
source [9. When it is desired to utilize a posi
increase, from the substantially zero value to a
The present invention thus provides a novel
electrical apparatus ‘for generating a rectangular
pulse upon application of a single momentary
abruptly draw current, such input voltage is ap
plied to the control electrode 16 through an input 65 pulse thereto. The apparatus is of such con
terminal 28 and capacitance '29, shown in broken
struction and operates in such a manner that
lines on the drawing;
‘
the magnitude and time-interval of the output
pulse is entirely independent of magnitude and
Inaccordance' with the principles of the pres
ent invention means ‘are provided for maintain
time interval of the input pulse. The apparatus
ing the output terminal at a substantially con 70 is further characterized by novel construction
stant high predetermined potential throughout a
wherein the output terminal is not connected
predetermined period of time, independently of
adjacent to other components of the circuit thus
the time-interval of the single momentary pulse
reducing regenerative action to aminimum, and
applied at input terminal 25, and forabruptly
thus operating at a high efficiency and in a re
tive momentary pulse to change the bias on con
trol electrode [6, in order to cause device I0 to
causing the potentialiof the output terminal to‘ 15' liable manner.
5
2,405,237
Although only one embodiment of the present
invention has been shown and described in de
tail heretofore, it is to be expressly understood
that various changes and substitutions may be
made therein without departing from the spirit
of the invention, as well understood by those
skilled in the art. Reference therefore will be
6
3. In an apparatus for producing a rectangular
pulse in response to a single momentary pulse
applied thereto, comprising a pair of vacuum
tubes each having a cathode, control electrode
L1
and an anode, a source of potential, circuit
means connecting said source to said tubes in
such a manner to maintain the anodes positive
had to the appended claims as a de?nition of the
with respect to the cathodes, a resistance in each
limits of the invention.
anode circuit, a resistance common to both
The invention described herein may be manu 10 cathode circuits, an output terminal connected
factured and used by or for the Government of
between the anode and corresponding anode re
the United States of America for governmental
sistance of one of said tubes, means normally
purposes without the payment of any royalties
applying a positive bias on the control electrode
thereon or therefor.
of said one tube whereby the anode draws cur
What is claimed is:
rent and the potential on the output terminal is
1. In an apparatus for producing a rectangular
substantially zero, means maintaining a negative
pulse upon application of a single pulse thereto
bias on the control electrode of said other tube
comprising a pair of electron discharge devices
whereby the anode of said other tube does not
each having at least a cathode, anode and con
draw current and is at a high potential, means
trol electrode, an input terminal connected to
applying a single momentary pulse to the cathode
the cathode of one of said devices, an output
of said other tube whereby the anode of said
terminal connected to the anode of the other
other tube draws current causing a potential
device, means normally maintaining the anode
drop at the anode thereof, means including
of said other device at substantially zero poten
capacitance means connecting the control elec
tial, means normally maintaining the anode of
trode of said one tube to the anode of the other
said one device at a high potential, means caus
tube whereby a negative bias is applied to the
ing a drop in the potential of the anode of said
control electrode of said one tube upon drop
one device upon application of the single pulse
in potential at the anode of said other tube thus
at said input terminal, means responsive to the
causing an abrupt cessation of current ?ow
drop in potential at the anode of said one device
therein and abruptly increasing the potential of
for causing an increase in the potential of the
the anode thereof, and resistance means con
anode of said other device, and means responsive
nected to the control electrode of said one tube
to a potential increase at the anode of said other
for maintaining the negative bias on the con
device for further reducing the potential at the
trol electrode thereof for a predetermined period
anode of said one device, the last-named means
of time.
including a direct connection between said
4. In an apparatus of the class described, a
cathodes.
pair of vacuum tubes each having a cathode, an
2. In an apparatus for producing a rectangular
anode and a control electrode, a source of poten
pulse upon application of a single pulse thereto
tial, means including a resistance connected to
comprising a pair of electron discharge devices
each of said anodes for applying positive po
each having at least a cathode, anode and control
electrode, an input terminal connected to the
cathode of one of said devices, an output ter
tential ‘from said source to said anodes, resist
ance means for applying the positive potential
of said source to the control electrode of one of
minal connected to the anode of the other de- _
said tubes, resistance means applying negative
vice, means normally maintaining the anode of
said other device at substantially zero potential,
means normally maintaining the anode of said
potential from said source to the control elec
trode of the other tube, means including a re
sistance connecting both of said cathodes to neg
one device at a high potential, means causing
ative potential of said source, and a condenser
a drop in the potential of the anode of said
coupling the anode of said other tube to the con
one device upon application of the single pulse
trol electrode of said one tube.
at said input terminal, means responsive to the
5. In apparatus of the class described, a pair
drop in potential at the anode of said one de
of vacuum tubes each having at least a cathode,
vice for causing an increase in the potential of.
an anode and a control electrode, means applying
the anode of said other device, means including
a positive potential to said anodes, means in
a resistance common to both of said cathodes
cluding a resistance common to the cathodes of
for'further reducing the potential at the anode
each of said tubes, means biasing the control
of said one device upon said potential increase
electrode of one of said tubes negative with re
at the anode of said other device, and means
spect to its cathode, a condenser coupling the
for maintaining the potential of the anode of
anode of said one tube to the control grid of
said other device at said increased value for a 60 the other said tube, and means applying a posi
predetermined period of time and for abruptly
tive bias to the control electrode of said other
varying the potential therof to a substantially
tube thereby normally sustaining said other tube
zero value after lapse of said predetermined
conducting and said one tube non-conducting.
period of time.
ARTHUR J. RUHLIG.
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