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Патент USA US3084294

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April 2,- .1963
H. R. SCHUL-rz, SR.. ET AL
Filed Dec. 30, 1959
United States Patent O ” ice
Patented Apr. 2, lâdâ
It is 'a still 'further object of this invention to provide
a simpliñed voltage control system that reduces the
'l‘lGN DÍSAEHNG Ciläîâlll'll‘
Harold ist. Schultz, Sr., Los Angeles, and Robert E.
supply voltage during short period overload conditions
land automatically reapplies the high voltage at the termi
nation yof a very short period.
It is another object of this invention to provide a
Mason, Costa Mesa, tCaliî., assâgnors to Hughes Air
craft Company, Culver City, Calif., a corporation of
simplified and reliable control system that not only
responds to a short circuit condition such ‘as arcing to
Filed Dec. 3G, i959, Ser. No. 863,032
temporarily reduce the supplied voltage to allow the arc
6 Claims. (Cl. 328-9)
10 to be terminated, but when the short ycircuit conditions
This invention relates to overload protection circuits
lcontinue yto occur :a pre-selected number of times, permaw
and particularly to a circuit for high speed control of -a
nently disconnects the voltage supply.
high voltage during short circuit or arcing conditions of
Briefly, this invention is a voltage control system that
the circuit being protected.
protects devices such as grid controlled traveling wave
lt is well known that with electronic equipment, rela 15 tubes from damage during high voltage short circuits lsuch
tively high voltages are sometimes required such as in
as arcing. A thyratron is provided with its anode to
biasing traveling wave tubes with a high cathode voltage.
cathode path coupled across the positive to negative
terminals of a traveling wave tube and its grid responsive
to the output pulse of a blocking oscillator. The block
can destroy the tube -in a very short period of time. It 20 ing oscillator is responsive to an increase of the potential
at the low voltage terminal of the traveling wave tube
is, thus, necessary to provide a voltage protection means
that reduces a high voltage to -a relatively lower voltage
indicating an increase of current through the cathode of
the traveling-wave tube resulting from an arcing condi
in `as small an elapsed time as possible in order to
adequately protect electronic equipment using very high
tion, to bias the thyratron into conduction so as to pro
25 vide a low impedance shunt path for current yfrom the
voltages such as required in traveling Wave tubes.
power supply. The storage capacitance in the pov/er
Previous methods are yfound to be generally too slow
supply thus rapidly discharges through the thyratron so
and unreliable to provide adequate protection to »some
In the presence of a defect or a short circuit condition
such as m'cing in a traveling wave tube, the high voltages
that the high voltage is temporarily reduced through the
electronic ydevices against short circuit and arcing lcondi
tions at very high voltages. Also, switching circuits of
the prio-r art `are expensive, bulky and unreliable because
of the large number of parts subject to failure. Relays
traveling wave tube to terminate the :arcing condition.
The reduced voltage also deionizes the thyrat-ron biasing
it out of conduction and automatically restoring the
traveling wave tube to normal operation.
are used to provide overload protection but relay 4devices
have a mechanical limit placed on the time in which they
can periorm their desired function. A physically large
relay is required to handle large voltages Vand currents
resulting in a long transit time of the mechanical moving
To provide a
means for permanently disconnecting the power supply
`during a pre-selected number of short circuits, a diode is
coupled to the cathode of the thyratron «and to ground
through a sensing capacitor which is charged during each
short circuit condition. The sensing capacitor is coupled
in parallel with a disabling relay land a gas tube so that
Fuse devices are relatively slow because of the time
when the capacitor is charge an amount indicative of
required to melt the fuse material and because of the
large arc developed lwhen disconnecting a large voltage. 40 the pre-selected number of short circuits, the disabling
lrelay is activated which in turn permanently disconnects
Also, =a fuse does not allow power to be :automatically
the power supply. Thus, a system is provided that auto
reapplied after the occurrence or” a short circuit condition.
matically restores operation `during random `arcing `con
A simple and reliable system that would disconnect
high voltages at a very high speed would be very valuable
ditions, but permanently disconnects the high voltage from
to the art. Also, a system that provides automatic reduc 45 the ftube when repetitive arcing is present.
tion of a `bias potential during temporary short circuit
The novel features of this invention, as well as the
invention itself, 4both as to its organization and method
conditions and further provides a means to permanently
of operation, will best be understood from the accom.
disconnect the bias potential during permanent Ashort cir
panying description, taken in connection with the accom
cuit conditions would greatly reduce the maintenance
panying drawing in which:
With grid controlled traveling wave tubes, the high
voltage potential is applied from the anode and collector
to the cathode, and pulsing operation is produced by
applying pulses to the grid. Control grids are provided
voltage «control system in accordance with this invention.
Referring to the ligure, a power supply lil is provided
ing an arcing condition.
for pulsed yoperation of the traveling Wave tube 12, which
The sole FIGURE is a schematic circuit diagram of a
to supply a high voltage to 'a traveling wave tube 12. The
in traveling wave tubes so that pulsing may `be carried 55 power supply l0 may include an AC. (alternating cur
rent) powerl source 14 supplying A.C. power to a primary
«out atp. relatively low voltage thus saving the `weight of
winding 16 of a ‘transformer l8r. The cur-rent path
modulating equipment required to pulse the high voltage
through the primary winding 16 may include a `switch
between the anode and cathode. Because of the presence
22 of a relay 2d, the switch 22 being normally closed
or” the grid, short circuits or arcs are especially prevalent
between the grid and anode of this type of traveling 60 until the relay 20 is energized to fopen the switch 22, at
which time the switch 22 remains open until the relay Ztl'
wave tube. Thus, a high voltage protection means to
yis manually reset, for example. The transformer llly in
temporarily lower the voltage to remove or suppress an
cludes a secondary winding 2d for applying a high voltage
arc is especially required to protect grid controlled travel
to a rectiñer 2‘6 lthat has one output terminal referenced
ing wave tubes.
lt is, therefore, 'an object of this invention to provide 65 to a supply lead 34 through a current limiting inductor 36
and resistor 38. The rectilier 26 also has another output
a voltage control circuit lthat provides high speed control
terminal that is referenced to a ground potential lead 28.
of a high voltage applied to an electronic device.
The power supply 1d supplies a negative potential such
lt is a further object of this invention to provide a
as »-l0,000 volts to the supply lead 34. Coupled between
high voltage control circuit that operates »at suflicient 70 'the leads 28 ‘and 34 is a capacitor ¿itl that provides filter
speed to protect a traveling wave tube from damage dur
ling and functions as la reservoir to supply peak current
capacitor arrangement is well known rin the art. The
capacitor 40 is relatively large in value `so that a large
peak current -may be provided With a relatively small
transformer 18 «and rectifier 26. It is to be noted that
The blocking oscillator 72, which is shown as a con
the power «supply '10 may be any conventional power
supply that provides means for storage of energy when
ventional parallel triggered blocking oscillator, includes
an Vamplifier tube 80 having a grid responsive 'to a rise of
the potential on the sensing lead 70 as shown by the wave
form 81 through .a coupling capacitor 82. The «grid of
the amplifier tube 80 is biased through a current limiting
the load, such as the traveling Wave 'tube ‘12 during pulsed
operation, periodically utilizes current. A >D-.C. 'genera
resistor 84 by la bias supply 816, which for example may
tor, tor example, stores suñicient energy to supply a
high curren-t for short periods -and m-ay be utilized in the _A
than the negative potential on the supply lead 34.
The bias supply '86 may be variable potential source to
system of this invention. Also, the capacitor 40* may be
elîectively coupled across the leads 28 and 34 in any
desired position in the circuit.
The supply lead 34 applies a negative voltage to a
be a 5 volt source 'to reduce the grid bias 5 volts less
control the dynamic range of the system by controlling
the potential at Which the amplifier tube till` is biased into
conduction. The amplifier tube Si) has a cathode biased
to the >negative 'supply lead y34 and an anode coupled to
the anode of 'a blocking oscillator tube 88, Áwhich in turn
has a cathode biased to the supply lead 34. 4A. transformer
90 is provided with a Winding 492 having one end biased
to a -|-‘150 volt terminal 94 and the other end coupled to
the anode of the tube 88. A «Winding ‘96 is inductively
cath-ode 44 yof the traveling Wave tube 12 which is shown
for purposes of illustr-ation in a `grid controlled arnange
ment with an anode 50 biased at substantially a ground
potential and a collector 51` grounded. The system of
this invention is equally applicable to a tuaveling Wave
tube arranged with the anode at -a high potential above 20 coupled to the winding 92 and has one end biased to a
~4 -volt terminal `98 and the other end Vcontrolling the
ground and the cathode grounded. Also, the system of
this invention is applicable to klystrons or other electronic
grid of the blocking oscillator tube 88. -An output wind
ing 100 is provided inductively coupled to the windings
devices that are subject to short circuit conditions such as
92 and 96 with one end coupled to a _20'` fvolt terminal
_ In the illustrated arrangement lof the traveling waive 25 102 ,and the other end applying an output signal shown
tube 12, a helix 46 has one end coupled to a termin-al 47
by a waveform 10‘3 to a lead 104. The terminals 94, 98
for receiving RF (radio frequency) energy and the other
and `102 are coupled to ‘a plate and bias supply i105 that is
end coupled to an output terminal 49‘ for applying arn
referenced to the negative potential of the supply lead 34.
pliiied RF energy thereto. The anode 50 is biased from
The output lead 104 applies the pulse of the waveform
ground through a dropping resistor `52. A .grid 53 is 30 103 to the grid of the thyratron tube `'74- through an in
controlled by pulses through a secondary winding 54 of
ducto'r -1tl6 and Va parallel coupled resistor 108. The
an isolating transformer 56. The Ágrid 53 is biased slightly
negative with respect to lthe potential on ‘the -supply lead
34 from -a negative bias supply 60. A pulse source 62
blocking oscillator ‘72 provides amplification and a pulse
of the waveform 103 that has `a steep leading edge for
vtriggering the thyratron tube 74 into conduction. In re
is provided to apply pulses through a primary winding 35 sponse to the pulse of the waveform 103, the thyratron
64 `of the transformer 56 for intermittedly biasing the
_tube 74 is triggered to an ionized Vcondition to provide a
traveling wave tube 12 into conduction. A cathode heater’low impedance path to ycurrent from the capacitor 40 for
'65 is provided and is responsive to +110 volts A.C. from
lowering the voltage on the supply lead 34 and removing
terminals 67. The cathode 44 is coupled by 2a ‘lead ’55
an arc, >for example, in the traveling wave tube i12. As the
vto the »supply lead 34 throu-gh a sensing resistor 68? and to 40 capacitor »40 discharges so that the voltage across the
ia sensing lead 70 to which is applied a Vsignal such las
thyratron tube 74 decreases, the gas therein is deionized
shown -by a waveform 81 when current is increased
fand normal operation is automatically restored. This
thnough the cathode 44. The sensing lead 70‘ may also
Voperation is the high speed short period disabling of the
be arranged to obtain la signal from Van induc'taince ele
circuit to overcome a single arcing of the traveling `rwave
ment 4such as a torroid coil arranged wi-th the lead 55 45 ‘tube 12.
passing therethrough «and the sensing llead 70 'coupled
to a winding Aaround the torroid, instead of utilizing a
sensing resistor 68. A torroid coil `arrangement has the
advantage that current now from «the cathode I44 is
hindered a minimum amount while the sening resistor ’68 50
`after a pre-selected 'number of arcing or short circuit con*
lditions have occurred and have been overcome by the
The arrangement to disconnect the power supply 10
'low impedance path through the thyratron tube 74, will
>now be explained. An isolating diode 1111‘2 of a long
has the «advantage that gradual voltage changes are sensed.
duration disabling circuit 111 is provided with an 'anode'
I't is to be recognized that when the traveling wave tube
coupled to the cathode of the tube 74 ythrough `a lead .114
12 is arranged with a grounded cathode `and `low voltage
and a cathode coupled through a lead 115' to a ch-arging
applied to the collector, the sensing lead 7()l maybe ar
?capacitor 116 which is in turn Acoupled to an adjusting
ranged to receive la signal from the collector. Also, with 55 resistor'i118. A movable tap 120 of the adjusting resistor
other electronic devices in which a high voltage ‘is sup
v11‘8 biases the resistor 1.18 to the potential on the lead 34.
plied, the sensing lead 70 may be appropriately arranged
Coupled in parallel across the charging capacitor 116 is a
to sense a short circuit or arcing condition. ‘
The sensing llead 70 applies a positive going signal to
winding 123 of a relay 124 with a gas tube `126, which
‘may be of the unipolar type, coupled in series between the
a blocking oscillator 72 that in turn controls va thyratron 60 coil 123 and the end of the capacitor 116 coupled to the
-tube 74, which as is well known is a gas 1tube in which the
`adjusting resistor 11S. The gas tube =1-26 which is nor
grid initiates the anode current but generally does not
'mally nonconductive (NNC) is arranged so that when
limit the «anode current. The `thyratron 74 which is nor
the capacitor 116 charges sufficiently, a positive potential
mally nonconducting (NNC), has an anode on which
on the lead 115 ionizes .the gas in tube 1‘26 to discharge
Avis impressed ground potential from the ground >lead 28
and has a cathode coupled to the supply lead 34 through a
resistor 76. The thyrat-non 74 also includes a cathode
`heater operated from llO volt A.C. terminals 78. Thus,
Vwhen a posi-tive going signal is applied 'to the grid of the
the capacitor through the winding 4123 and energize the
‘relay 124.
When the relay 124 is energized, a switch 1128 ‘is closed
and a terminal 13,2 applies +30 volts through a lead i133
to .a winding y134 of the relay 20, thus tripping the relay
`~thyratron 74 from the blocking oscillator 72A, the thyratron 70 20, opening the switch 22 and disconnecting lthe power
74 is biased into conduction and the gas therein is ionized.
-supply 10 from the supply lead 34.
Thus, a «low impedance path is provided between the
Now ’that the arrangement of the syste-m has been ex
ground lead 28 and 'the nega-tive supply lead 34 during
plained, the ‘operation thereof will `be explained in further
a Vshort period before the potential on the cathode rises
detail. During normal operation a potential such as
to dcionize the gas in the tube 74.
75 -l0,000 volts may be substantially maintained on the
supply lead 34, the required voltage being determined by
the electronic device to which the voltage is applied such
rise and collapse of the iield the pulse of the waveform 103
is developed, which pulse has a relatively large amplitude,
as the traveling wave tube l2.. In response to a pulse from
compared to the waveform 81, and has a fast rise time
the pulse source `di’. applied to the grid 53, a stream of
electrons lis transmitted from the cathode 44 through the
for controlling the thyratron tube 74. By using a block
ing oscillator the sensing resistor 68 coupled to the cathode
grid 53, through an aperature in the >anode Sti` and through
the center of the helix ¿i6 to the collector 51. Thus, as is
in value because a small signal will trigger the blocking
d4 of the traveling wave tube l2 may be relatively small
oscillator 72. Also, the shape of the voltage of the wave
well known in the art, energy may be transferred to an
form 1% is independent of the shape of the voltage riso
R‘F signal applied to the helix d6 at the terminal ¿i7 to
provide amplification of the signal at the terminal del.
10 of the waveform 8l on the sensing lead 70.
The signal of the waveform 103 is applied through the
ln the arrangement shown, the cathode ¿le is maintained
peaking inductor 106 with a minimum of delay to they
at the low voltage and the anode 5t) and the collector 5l
grid of the thyratron tube 74, initiating conduction by
are substantially grounded. Arcing has been found to
ionizing the gas therein. Thus, a low impedance shunt
occur between the anode Sil and the `grid ‘53 when any
path is provided across the traveling wave tube 12 bef
defect is present such las stray electrons being emitted
tween the leads 34 and 23. The storage element in the
from the cathode ed. Arcing may .also occur between
power supply lt) such as the capacitor 40 is rapidly dis
the anode ‘Sil and the shielding (not shown). Normal de
charged through the tube ‘74 with a short fall time because
viations in manufacture make it difficult to produce a
of the low value of resistance present in the path. Because
traveling wave tube in which the electron gun including
the cathode ¿ifi- does not produce stray electrons at some 20 current is limited through the inductance 36, the poten
tial on the supply lead 34 rapidly rises until the voltage
time during the operating life of the tube. Another cause
across the thyratron tube '74 is reduced to a small Value
of arcing between the anode `Sil and the grid 53 is ioniza
so as to deionize the tube and again present a high imped
tion of any gases in the traveling wave tube by cosmic rays
ance to current ilow therethrough. Also, the voltage
which may occur in outer space applications of the tube,
across the traveling wave tube l2 is reduced so as to
as in a satellite. A grid type traveling wave tube has been
found to be a necessity for operations such .as in satellites
eliminate arcing in the traveling wave tube l2.
where weight is an important factor. A traveling wave
where the high potential between the collector and cath
ing oscillator 72 falls before this deionization occurs so
The pulse of the waveform N3 developed by the block
that the potential drop between the anode and cathode of
equipment that is unsatisfactory in most space operation. 30 the thyratron tube 74 renders the tube nonconductive.
Thus, the high potential is again applied across the travel
Thus, in the arrangement shown in accordance with
ing wave tube l2 and normal operation is restored. The
this invention, the tube l2 is pulsed at .the grid 53 from a
discharge time of the capacitor 4G and the ionization
pulse source 6?; so that peak power may be developed by
time of the thyratron tube 74 are very small. Also, as
the tube during the occurrence of a pulse. rl'he pulse
is Well known, the delay time through the blocking oscil
source d2. may be synchronized with the pulsing operation
lator ’72 is a minimum. Thus, the high voltage is rapidly
of a pulsed transmitter, for example. The voltage which
removed across the traveling wave tube 12 so as to pre~
may be 10,000 volts or higher is maintained across the
vent any damage thereto. Also, the deionization time of
traveling wave tube 11.2 during normal operation. «How
ode is modulated requires heavy and bulky modulating
the thyratron tube 74 is very small so that normal opera
ever, once an arc is initiated the system of this invention
tion is rapidly restored.
goes into operation to remove the high lvoltage so as to 40
The above described operation protects the tube l2
remove the arc. As is well known, an arc once initiated
during each arcing condition. However, when arcing oc~
curs successively the long duration disabling circuit lll
destruction of the tube. This arcing may occur only
operates to disconnect the power supply lil from the
occasionally as a result of a random action or of ioniza
traveling wave tube l2. During each arcing condition,
tion, or the arcing may occur many times indicating a 45 the potential on the cathode of the thyratron tube 74
permanent defect. The system or this invention rapidly
rises as a result of current passing through the resistor
controls either a single or a permanent default.
76, and the diode M2 is biased into conduction to pass
When a short circuit such as an arc between the anode
some charging current to the charging capacitor 116.
Si) and grid S3 occurs, the voltage on the lead 55 rises
This current is passed through the diode 112 only during
toward ground potential, developing a positive signal as 50 the short period that the tube 74 is maintained in con
shown by the Waveform 8l which is applied to the block
duction because when the tube 74» is deionized, the neg".
ing oscillator 72 to start the blocking oscillator action.
tive supply potential is again impressed on the anode and
Thus, an eñective feedback path for temporarily discon
cathode of the diode 112. The charging capacitor llo
necting the power supply is provided as shown by an ar
substantially maintains its charge, discharging only a
row ’ma along the lead 79 and as shown by an arrow 55 small amount because of the small amount of leakage
ltlála between the blocking oscillator 76 and the tube 74.
current present. Thus, the lead 2.11.5 becomes more posi
When the signal of the Waveform 81 is applied to the grid
tive each time a fault or arcing condition occurs. After
of the amplifier tube till and rises to a required level, the
`a pre-selected number of successive corrections of a short
tube Sii is biased into conduction applying a negative going
circuit condition, the capacitor 116 rcharges sufficiently
pulse `to the anode of the tube SS. The leading edge of
to ionize the gas tube X26 and `current flows through the
this negative going pulse is applied through the windings
winding 123 to energize the relay 124;. The relay me
92 and 96 to the grid of the tube SS as a positive signal.
applies +30 volts through a feedback path for permanent
To further describe the blocking oscillator action, as
ly disconnecting the power supply as shown by an arrow
current starts to ilow through the winding 92, a magnetic
133e, to the relay Ztl which is in turn energized to open
iield is set up in the transformer 9d to induce a potential
the switch 22 and disconnect the AC. source i4 from the
in the winding @d such that the end thereof as coupled
lead 34. Thus, the power is disconnected from the travel
to the grid of the tube de’ is positive. rl`his magnetic field
ing Wave tube l2 until the relay 2d is manually reset, for
is maintained and, if not rapidly controlled, results in
builds up from zero to a maximum in direct proportion
to the current passed through the anode of the ampliiier
tube 33 and therefore induces a voltage at the grid of the
The adjustable tap Mil is provided so that a desired
bias Vis maintained on the terminal of the gas tube 125
tube S3. As the tube 8S draws current through its anode,
connected thereto. Thus, the tap 120 may be adjusted
the magnetic field in the transformer 9@ continues to
so that after a pre-selected number of arcs of the tube 12
build up until such time as the current through the anode
and periods of conduction of the thyratron tube 74, the
of the «tube dit reaches its maximum value. Shortly after
gas tube 126 will be biased into conduction to disconnect
this time, the field starts to collapse. As a result of the
the power supply. Because of the leakage of the charg
ing capacitor 116, the pre-selected number of arcing con
ditions must occur Within a calculated period to discon
nect the power source. Thus, a selected number of de
faults yof the traveling wave tube 12 indicating a permanent
tron for initiating conduction of said thyratron in re
sponse to said signal from said sensing resistor, a biasing
resistor coupled in ythe anode to cathode path of said
thyratron, a diode coupled to the anode -to cathode path
defect in its operation results in the power supply being
disconnected to prevent a large number of short period
arcs that would eventually destroy the tube. Because
thyratron, »a charging capacitor coupled between said
traveling wave tubes are expensive and diflicult to con
tube and a relay having a coil with said gas tube and
of said thyratron between said biasing resistor and said
diode andan output terminal of said power supply, a gas
struct, the above arrangement has the advantage that the
coil coupled in series across said charging capacitor, and
»defect may be corrected at the end of a period of utiliza l0 switching means coupled to said sou-ree of power and to
said relay for disconnecting said source of power when
It is to be noted that although the electronic device
said charging capacitor charges to a potential to bias said
supplied with a potential and protected against short cir
gas tube into conduction.
cuit conditions has been described as a grid controlled
3. A voltage control system comprising a source of
traveling tube, the principles of this invention are equally
power having iirst and second output terminals and hav
applicable to other traveling wave tube arrangements and
ing a path for applying power thereto, a storage capacitor
to other electron devices such as :klystrons or magnetrons.
coupled across said output terminals, a traveling wave
It is also to be noted that the illustrated potentials are
tube having a collector to cathode path coupled respec
only for purposes of illustration and may be reversed
tively across said tirst and second output terminals, a
where applicable.
thyratron having a control grid and having an anode and
Thus, there has been described a high voltage control
a cathode coupled across lsaid first and second output
system for supply-ing a high potential to» an electronic de
terminals to form a current path, current sensing means
vice -that rapidly lowers the supplied voltage during the
coupled -in the collector to cathode path of said travel
occurrence of a short circuit condition such as arcing.
ing wave tube between the cathode and said second termi
The system then automatically restores the high potential
nal of said source of power, a blocking oscillator having
to resume normal operation. A long duration disabling
an input terminal coupled to the cathode of said traveling
circuit is provided that Vcharges a capacitor during each
-wave tube and having an output terminal coupled to the
defect. When a pre-selected number of arcing conditions
.control grid or" said thyratron, a signal forming resistor
occur during a certain period, relay circuits are activated
coupled in the current path between the cathode of said
to permanently disconnect .the power source from the de 30 thyratron and said second output terminal of said source
vice being biased. ‘This arrangement is especially ap
of power, a diode having an cathode and having an anode
plicable to overcome the problems of utilization of a grid
coupled to the cathode of said thyratron, variable re
ycontrolled traveling `wave tube where the supplied bias is
sistance means having one end coupled to the second ter
maintained between the collector and cathode and pulsing
minal of said source of power, a charging capacitor cou
is applied only to the grid so that an arcing condition 35 pled between the cathode of said diode and the other end
once initiated -w-ill be maintained to destroy the tube.
of said variable resistance means, relay means having a
What is claimed is:
coil with one end coupled between said diode and said
1. A voltage control circuit comprising a power su-p
charging capacitor, and 4a gas tube coupled from between
ply, having a switching means for deactivating said power
the other end of said coil to between said charging ca
supply, a current storage means coupled across said power 40 pacitor and said resistance means.
supply, -a traveling wave tube having a cathode to col
4. A voltage control circuit comprising a source of
lector path coupled across said power supply, said travel
voltage having a positive and a negative supply terminal
ing wave tube being susceptible of arcing, a thyratron
and a path to said supply terminals, current storage means
having a control terminal and having a current path cou
pled .across said power supply, a blocking oscillator cou
pled to said cathode to collector path of said traveling
wave tube and to said control termin-al of said thyratron,
said blocking oscillator responding to an arcing condi
tion to initiate said thyratron into conduction so that said
current path discharges said current storage means of said
power supply to lower the voltage across said traveling
wave tube so as to remove said arcing and to bias said
thyratron out of conduction, `and a memory circuit in
cluding a capacitor coupled ‘to said current path of said
thyratron and to a source of reference potential for being
charged when said thyratron is conductive and including
a series coupled coil of a relay `and la gas tube coupled
coupled between said positive and negative supply ter
minals, a gas tube having an anode coupled to said posi
tive supply terminal, a cathode coupled to said negative
supply terminal to form a current path and having a
grid, a load subject to arcing shorts and including signal
forming means to develop an overload signal in response
to an arcing short, pulse forming means coupled to said
signal forming means and coupled to said control grid of
said gas tube for responding to said overload signal to
apply a pulse having a fast rise time to the control grid
of said gas tube so as to initiate said gas tube into con
duction and discharge said current Vstorage means to reduce
the potential across said load for removing said arcing
short and to reduce the potential between the anode and
cathode of said gas tube for biasing said gas tube out of
across said capacitor for passing current through said
coil of said relay when said capacitor charges a prede
conduction, a diode coupled to the cathode of said gas
termined amount, said relay coupled ,to said switching 60 tube, a cathode resistor coupled in said current path be
tween the cathode of said gas tube and said negative
means of said power supply for deactivating said power
supply when said capacitor charges said predetermined
supply terminal, a variable resistance coupled to said
2. A voltage control system for controlling voltage
negative supply terminal, a charging capacitor coupled
between said diode and said variable resistance, `a relay
vfrom a source of power applied to a traveling wave tube, 65 having a coil with a first and a second end with one end
coupled to between said diode and said charging ca
said traveling »wave tube including a cathode to collector
pacitor, means responsive to a predetermined potential
path coupled across said source of power, the system hav
ing a storage capacitor coupled across the output termi
nals of ysaid power supply comprising a »thyratron having
diiference across a ñrst and a second terminal thereof
power and having a grid, a sensing resistor coupled in
the cathode to collector path of said traveling wave tube
terminal coupled between said charging capacitor and
said variable resistance, and switching means coupled in
for developing a signal during the occurrence of an are
said path of said source of voltage and to said relay for
disconnecting the voltage across said supply terminals
when said capacitor charges so as to bias 4said means
to be biased into conduction and having said iirst terminal
an anode to cathode path coupled across said .source of 70 coupled to the second end of said coil and said second
in said traveling wave tube, a blocking oscillator coupled
between said sensing resistor and the grid of said thyra
responsive to a predetermined potential difference into
5. A voltage control circuit to protect a load against
arcing shorts in a current path therethrough having first
and second ends, comprising a power supply coupled to
sponse to a control signal and a potential diñerence at
the first and second ends of said current path across
the ends of `said current path, said control means being
normally nonconductive, said control means after being
initiated into conduction, remaining in conduction until
the potential difference at the ends of said current path
decreases to a predetermined value, a blocking oscillator
said load and having a switching means for deactivating
coupled to the second terminal of the path through said
said power supply and a current storage means coupled
load and to said control terminal of said control means,
across said power supply, a thyratron having a control
said blocking oscillator responding to an arcing short to
terminal and having a current path coupled across said
4said control means into conduction so that the
power supply, a lblocking oscillator coupled to the cur 10 current path through said ycontrol means discharges said
rent path of said load and to said control terminal of
current storage means of said power supply to lower the
said thyratron, said blocking oscillator responding to an
voltage across said load, remove said arcing short and
arcing short to initiate said thyratron into conduction so
decrease the voltage across the current pathvof said con
that the current path thereof discharges said current
trol means to said predetermined value to bias said control
storage means of said power supply and lowers the voltage
means out of conduction, and a memory circuit includ
across said load so as to remove said arcing short and
ing a capacitor coupled to said current path of said con
to bias said thyratron out of conduction, and a memory
trol means and to a source of reference potential for
circuit including a capacitor coupled to said current path
of said thyratron and to a source of reference potential
Íbeing charged when said control means is conductive
for being charged when said thyratron is conductive and
20 and including a series coupled coil of a relay and a gas
including a series coupled coil of a relay and a gas tube
through said coil of said relay when said capacitor charges
tube coupled across said capacitor for passing current
coupled across said ycapacitor for passing current through
a predetermined amount, said relay coupled to said switch~
said coil of said relay when said capacitor charges a
ing means of said power supply -for deactivating said
predetermined amount, said relay coupled to said switch
power supply when said capacitor charges said prede
ing means of said power supply for deactivating said 25 termined amount.
power supply when said capacitor charges said pre
determined amount.
6. A voltage control circuit to protect a load against
arcing shorts in a path therethrough between íirst and sec
ond terminals comprising a, power supply coupled be 30
tween the ñrst and second terminals of said load and
having a switching means for deactivating said power
supply and a current storage means coupled across said
power supply, control means having a current path
coupled across said load and having a control terminal 35
for initiating said control means into conduction in re
w References Cited in the ñle of this patent
Parker ______________ __ Nov. 13,
Floyd ______________ __ Nov. 10,
Alsmeyer ____________ __ Jan. 31,
Coombs ______________ _.. Dec. 3,
Weldon ______________ __ July 29,
Sprengeler et al. ______ __ Apr. 14, 1959
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