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Nov. 6, 1962
3,062,969
A. W. WILKERSON
HIGH ENERGY PULSE GENERATOR CIRCUIT
Filed Dec. 19, 1958
2 Sheets-Sheet l
F/é‘. 1
47
0c. POWER
SUPPLY
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VOLTAGE
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RISE TIME DETERMINED
BY 7% TIME CONSTANT 0F
P35 4N0 RES/5W1? 39.
SLOW FALL TIME BECAUSE
0F DAMP/N6 ACTION OF
DIODE D34.
CURRENT
F/G. 25
IN PRIMARY 36
El.i1;_
‘
0F P35
VOLTAGE H
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F/G. 26‘
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37 0F P35.
'
INVENTOR.
Alan W Wilkerson
BY
WM
M34 M
.
J
41775.
United States Patent 0
3,062,969
Patented Nov. 6, 1962
2
exactly ‘but only approximately phased 180° from one
another; and
3,062,969
HIGH ENERGY PULSE GENERATOR CIRCUIT
Alan W. Wilkerson, Racine, Wis., assignor to The Louis
FIGURES 4A, 4B and 4C illustrate the wave forms
occurrent in the circuit of FIGURE 3.
Allis Co., Milwaukee, Wis., a corporation of Wisconsin
Filed Dec. 19, 1958, Ser. No. 781,707
12 Claims. (Cl. 301-885)
Referring now to the drawings, there is shown in FIG
URE 1, a balanced output pulse generator circuit 10 in
accordance with the invention made up of a ?rst stage 24)
and a second stage 30 connected in series across va source
The present invention relates to high energy pulse gen
erator circuits and particularly to pulse generator circuits
of alternating current power ‘11. The stage 2t) includes
useful for ?ring electron tube recti?ers of the mercury 10 a transistor TRZI and a transistor TRZZ, both shown to
be of the PNP type, diode D23, diode D24, and a pulse
arc type and of the gas ?lled type.
transformer P25.
Recti?ers of the types mentioned all include a start
The stage 36 is identical in structure
to the stage 20 and includes a transistor T'R31, transistor
electrode for initiating emission of electrons between the
T1132, diodes D33 and D34 and a pulse transformer P35.
anode and cathode elements of the tubes. In each in
stance, the power supplied to the start electrode must be 15 Power is supplied to both stages of the circuit from a
direct current source by ‘means of a biasing resistor 46
of su?icient magnitude to cause initial emission of elec
and a diode D45. In the quiescent state, no alternating
current signal is applied to the circuit from the source ‘11
so that the transistors TRZI and TR31 are substantially
supplying the required excitation for rendering the tube 20 non-conductive in the emitter-base paths thereof. A
small leakage current ?ows from ground potential at‘ the
conductive. Another type of mercury arc recti?er is the
trons. One form of mercury arc recti?er is the excitron
including an excitation anode to which a high energy
pulse generator circuit must be connected for purposes of
positive electrode of the direct current power supply
ignitron which is provided with an ignitor electrode sup
through the small resistance 28, the emitter-collector path
plied from a high energy pulse generator circuit. The
of the transistor TRZI, and a resistor 29‘ to negative bat
thyratron is a kind of gas ?lled recti?er tube including
a control grid to which the high energy pulse generator 25 tery potential, and a corresponding leakage current ?ows
from ground potential through the small resistance 38,
is connected. A pair of any of these types of recti?ers
the emitter-collector path of the transistor TR31 and the
are quite often employed for purposes of achieving full
resistor 39 to the negative terminal of the D.C. power
‘wave recti?cation, in which case it is necessary that the
supply. In this circumstance, the base electrode of the
pulse generator circuit produce two chains of pulses that
are exactly 180° out of phase with one another.
30 transistor TR22 which is connected to the emitter elec
It is a general object of the present invention to pro
vide a new and improved high energy pulse generator cir
cuit of simple design and high dependability useful for
?ring triggered recti?er tubes.
A more speci?c object of the invention is to provide an 35
improved pulse generator circuit capable of providing a
high power output from a low power input and capable
of a substantially trouble free operation for a substantial
period.
An additional object of the invention is to provide a
high e?iciency pulse generator circuit capable of produc
ing two chains of balanced output pulses that are dis
placed exactly 180° from one another.
An additional object of the invention is to produce a
high e?iciency transistor pulse generator capable of pro
ducing a high power output from a low power input and
characterized as having a high input resistance thereby to
prevent loading of the power source.
A speci?c object of the invention is to provide a new
trode of the transistor TRZI is established at approxi-_
mately ground potential and the base electrode of the
transistor TR32 which is connected to the emitter elec
trode of the transistor TR31 is also at approximately
ground potential. The emitter electrodes of these tran
sistors are biased at a potential negative with respect to
the base by the current ?ow from ground potential through
the constant voltage diode D45 and the biasing resistor
as to negative battery potential thereby rendering the
40 transistors TR22 and TR32 also non-conductive in the
emitter-base paths thereof. Thus, when no signal is ap
plied to the circuit at the signal generator ‘11, the transis
tors TR21, TR22, TR31 and TR32 are cut-off. Accord
ingly, there is no current flow through the primary wind
ings of the pulse transformers P25 and P35.
Assuming now that an alternating current signal from
' the source 11 as shown in FIGURE 2A is applied to the
circuit, the stages 2a and 30 alternately are rendered con
and improved transistorized generator circuit capable of
ductive on alternate half cycles. Speci?cally, considering
the half cycle when the input terminal 14 is rendered posi
supplying high energy pulses for use in ?ring excitron
tive with respect to the input terminal 15, a very small
tubes conpected in a full wave recti?er circuit and to pro
vide these pulses in predetermined phase relationship with
signal current ?ows from the source 11 at the terminal 14
through the loop including the resistor 12, the diode D23,
the resistors 28 and 38, the emitter-base path of the tran
respect to the alternating current power source providing 55
sistor TR31 and the resistor 13 to the terminal 15. The
the anode voltage to the excitrons.
emitter-base current ?ow into the transistor TR3~1 ren
Further objects and features of the invention pertain
ders that transistor conductive so that a substantial cur
to the particular structure and arrangements whereby the
rent ?ows in a path from ground potential at the positive
above-identi?ed objects and other objects of the invention
electrode 47 of the D.C. source, through the resistor 38,
are achieved.
the emitter-collector path of the transistor TR31 and the
The invention, both as to its arrangement and mode
resistor 39 to the negative electrode 48 of the power sup
of operation, will be better understood by reference to
ply. The current flow through the resistor 38 causes a
the following disclosure and to the drawings forming a
voltage drop that biases the base electrode of the tran
part thereof wherein:
sistor TRSZ negative with respect to the emitter electrode
FIGURE 1 is a schematic representation of the tran
thereof so that a current ?ows in the emitter-base path
sistorized pulse generator circuit in accordance with the
thereof. Accordingly, the transistor TR32 is rendered
invention providing two chains of pulses phased exactly
180° from one another;
FIGURES 2A, 2B, and 2C illustrate the wave forms
full conductive so as to cause a substantial current flow in
a path from ground potential at electrode 47 through the
occurrent in the circuit of FIGURE 1;
70 constant voltage diode D45, the emitter-collector path
of the transistor TR32, the primary winding of the pulse
FIGURE 3 is a modi?cation of the arrangement illus
transformer P35 to the negative terminal 48 of the D.C.
trated in FIGURE 1 wherein the output pulses are not
3,062,969
3
power supply. The current flow in this loop increases
rapidly until it is limited by the supply voltage from the
D.C. power supply and the resistance of the primary
winding 36 illustrated by FIGURE 2B thereby causing a
pulse to appear across the terminals of the secondary
winding 37 of the pulse transformer as shown in FIG
URE 2C.
Inasmuch as operation of the transistor TR32 is such
that it is quickly saturated and draws a full emitter-collec
4
of applying proper biasing potentials to the circuit from
the DC. power supply source.
Considering now the operation of the circuit of FIG
URE 3, and the circumstance wherein the applied alternat
ing current signal shown in FIGURE 4A renders the in
put terminal 70 positive with respect to the input terminal
71, during this half cycle, the circuit is not operated inas
much as a shunt path is completed from the source 11
at the input terminal 70 through resistor 67, the diode
tor current during its period of conductivity, the pulse 10 D53 and the resistor 59 to the input terminal 71. During
across the terminals of the secondary winding 37 is peaked
and corresponds closely to a square wave as illustrated in
the next half cycle when the input terminal 71 is rendered
positive with respect to the input terminal 70, the current
FIGURE 1. This high energy pulse may be used to ?re
a recti?er tube of the type mentioned. During the di
path is completed from the source 11 at the input terminal
71 through the resistor 59 and the emitter-base path of the
minishing portion of the half cycle signal and when the 15 transistor TRSl and the resistor 67 to the input terminal
input electrode 15 establishes the base potential of the
72, whereby the transistor TR51 is rendered conductive.
transistor TR31 positive with respect to the potential on
Accordingly, a substantial current flow is experienced
the emitter electrode thereof, the transistor TR31 is cut
from ground potential through the resistor 59 and the
off so that the current ?ow through the resistor 38 is sub
emitter-collector path of the transistor TR51 and the
stantially diminished thereby again establishing the base 20 resistor 60 to the negative terminal of the DC. power
electrode of the transistor TR32 positive with respect
supply. Because of the substantial current flow through
to the emitter electrode thereof. Accordingly, the tran
the resistor 59, the base of the transistor TR52 is biased
sistor TR32 is rendered non-conductive and the current
negative with respect to the emitter electrode thereof
?ow through the primary winding 36 of the pulse trans
whereby the transistor TR52 is rendered conductive in
former 35 rapidly decreases to zero. To damp the induc 25 the emitter-base path and a saturating current is drawn
tive voltage surge that always accompanies the interrup
from ground potential at the positive terminal 76 from
tion of current ?ow through the winding of a transformer,
the power supply through the constant voltage diode
the diode D34 is connected in parallel with the winding
D65, the emitter-collector path of the transistor TRSZ
36 thereby to provide a low impedance path for dispersing
and the primary winding 56 of the pulse transformer 55 to
the surge voltage. This is illustrated by the gradual slope 30 the negative terminal 77 of the power supply. Thus dur
in the trailing portion of each pulse in FIGURE 28.
ing the rising portion of the half cycle, a current surge is
During the next half cycle, when the input terminal
experienced in the primary winding 56 which produces
15 is rendered positive with respect to the input terminal
corresponding pulses in the secondary windings 57 and
14 a current path is completed from the source 11 at the
58.
terminal 15 through the resistor 13, the diode D33, the 35
During the diminishing portion of the half cycle, the
resistors 38 and 28, the emitter-base path of the tran
rate at which current decreases in the primary of pulse
sistor TRZI and the resistor 12 to terminal 14. Accord
transformer P55 is controlled by diode D54 and resistor
ingly, the transistor TR21 is rendered conductive in the
61 connected across the terminals thereof. Resistor 61
emitter-base path and a substantial current is drawn from
is selected so that this rate of decrease in the primary
ground potential through the resistor 28, the emitter 40 winding 56 is equal to the rate of increase therein at the
collector path of the transistor TRZI and resistor 29 to
the negative terminal of the DC. power supply thereby
start of the half cycle.
Therefore, a second pulse of a
polarity opposite to the ?rst produced pulses appears in
biasing the base electrode of the transistor TRZZ nega
each of the windings 57 nad 58.
tive with respect to the emitter electrode and rendering
By arranging the windings 56, 57 and 58 on the trans
that transistor conductive. Thereupon a large current flow 45 former core and providing terminals in the manner as
is experienced from ground potential at electrode 47
indicated in the FIGURE 3 and including a diode D80
through the constant voltage diode D45, the emitter-col
in series with the winding 57 and a diode D81 in series
lector path of the transistor TRZZ, the primary winding
with the winding 58 as indicated, only the ?rst produced
26 to the pulse transformer P25 to the negative electrode
pulse in each half cycle will appear across the terminals
of the DC. power supply. As the transistor TR22 is 50 of winding 57 and only the second produced pulse in each
rendered full conductive at this time, the current rises
half cycle will appear across the terminals of winding 58.
rapidly in the primary winding 26 of the pulse trans
Inasmuch as these two pulses occur at the beginning and
former thereby producing a pulse across the terminals of
at the end, respectively, of a half cycle, they are phase
the secondary winding 27. This output pulse is of the
displaced, not exactly, but only approximately 180°. The
same characteristic as that produced across the second 55 relationship between the current in the primary winding
56 and the voltages at the output terminals of the second
ary winding 37 of the pulse transformer 36 so that it is
ary windings 57 and 58 are shown in FIGURES 4B and
peaked and conforms to a square wave. This output pulse
4C, respectively.
can also be employed for purposes of ?ring reeti?ers of
The advantages of the arrangements disclosed herein
the type mentioned.
60 are many, one being that the circuit is substantially in
Inasmuch as the two-pulse outputs of the secondary
sensitive to ambient temperature changes inasmuch as
windings of the pulse transformers P25 and P35, respec
the transistors are always operated either in the cut-off or
tively, are exactly 180° out of phase with regards to one
saturated state. Further, because the transistors are op
another, these pulses can be used for purposes of ?ring
erated in either one of the two extreme states, the power
two excitrons, for example, connected in a full wave
dissipation in the transistors is very low. Speci?cally,
recti?er circuit.
high voltage and high current conditions do not occur
A variation of the arrangement shown in FIGURE 1
simultaneously, so that the transistors handle amounts of
is illustrated in FIGURE 3 which circuit is comprised es
power many times their rated dissipation and small tran
sentially of but one of the mentioned stages shown in the
sistors act to produce the considerable power output. In
arrangement of FIGURE 1. Speci?cally, the circuit 50 70 addition, as the circuit is characterized as having a high
of FIGURE 3 includes a transistor '1'R51, a transistor
input resistance and the power in the system producing
TR52, a diode D53, a diode D54, and a pulse transformer
the high energy pulses is derived essentially from a DC.
P55 including a primary winding 56 and secondary wind
power supply, it is necessary that the signal source for
ings 57 and 53. Additionally, a constant voltage diode _ controlling the operation of the circuit have only a small
D65 and a biasing‘resistor 66 are provided for purposes
power output rating. Through the use of this circuit an
3,062,969
5
increased efficiency pulse generator is achieved which is
capable of providing substantial trouble free operation for‘,
6
the input and output electrodes thereof during the inter-'
val of said control signal, whereby a substantial change in
current flow is experienced in said second connection
a sustained period of time.
with the change in state of said electron flow device from
While the arrangement described herein is at present
non-conduction to conduction and high energy pulses are
considered to be preferred, it is understood that varia
produced in the output of said pulse transformer.
tions and modi?cations may be made therein, such as
4. A pulse generator circuit comprising a source of
modifying circuits to utilize NPN type transistors, without
power including a ?rst terminal and a second terminal, a
departing from the scope of the invention, and it is in
constant voltage diode device, a ?rst resistance device, a
tended to cover in the appended claims all such variations
and modi?cations as fall within the true spirit and scope 10 ?rst connection from the ?rst terminal to the second ter
minal of said source via said diode device and
of the invention.
said ?rst resistance device, a saturable ?rst electron flow
What is claimed is:
device including an input electrode and an output electrode
1. A pulse generator circuit comprising a source of
and a control electrode, a pulse transformer, a second
power including a ?rst terminal and a second terminal,
voltage divider means completing a ?rst connection across 15 connection from the junction between said diode device
and said ?rst resistance device to the second terminal of
the terminals of said power source for providing a con
said power source via the input electrode and the output
stant voltage and variable current at its center-tap, an
electrode of said ?rst electron ?ow device and a winding
electron flow device including an input electrode and an
of said pulse transformer, a second resistance device, a
output electrode and a control electrode, a pulse trans
former, a second connection from said center-tap to the 20 third connection from the ?rst terminal of said power
source to the control electrode of said ?rst electron flow
second terminal of said power source via the input elec
device via said second resistance device thereby to bias
trode and the output electrode of said electron flow device
said electron ?ow device non-conductive between said
and a winding of said pulse transformer, means for bias:
input and control electrode, a second electron ?ow device
ing said electron ?ow device non-conductive at said con
trol electrode, a source of control signals, and control 25 including an input electrode and an output electrode and
a control electrode, a fourth connection from said con
means connected to said control electrode and responsive
trol electrode of said ?rst electron ?ow device to the sec
to each control signal from said signal source for biasing‘
ond terminal of said power source via the input electrode
said electron ?ow device conductive at said control elec-_
and the output electrode of said second electron device,
trode to render said device full conductive between the
input and output electrodes thereof, whereby a substantial 30 a source of control signals, and means connecting said
source of signals to the control electrode of said second
change in curernt flow is experienced in said second con
electron ?ow device for rendering said device full con
nection during the interval of each of said control signals
thereby porducing high energy pulses in the output of said
pulse transformer.
,
_
ductive between the input and output electrodes thereof
responsive to the occurrence of each control signal, there
2. A pulse generator circuit comprising a source of 35 by to cause current ?ow through said second resistance
power including a ?rst terminal and a second terminal, a
voltage divider including a constant voltage diode device
device and to bias said ?rst electron ?ow device to satu
trode and a control electrode, a pulse transformer, a sec
ond connection from the junction between said diode
change in state of said electron ?ow device from non
conduction to conduction and high energy pulses are.
high energy pulses in the output of said pulse transformer.
said pulse transformer, a ?rst unidirectional currentvde
3. A pulse generator circuit comprising a source of
power including a ?rst terminal and a second terminal,
a constant voltage diode device, a resistance device, a ?rst
connection from the ?rst terminal to the second terminal
of said source via said diode device and said resistance
device, a saturable electron flow device including an input
electrode and an output electrode and a control electrode,
a pulse transformer, a second connection from the junc
tion between said diode device and said resistance device
to the second terminal of said power source via the input
electrode and the output electrode of said electron flow
device and a winding of said pulse transformer, a third
connection from the ?rst terminal of said power source
to said control electrode, thereby to bias said electron
flow device non-conductive between said input and con
trol electrodes, a source of control signals, and control
means connected to said control electrode and responsive
to each control signal from said signal source for biasing
said electron flow device to saturable conduction between
vice connected across the terminals of the primary wind
rable conduction between the input and output electrodes
at the control electrode thereof during the interval of said
and a load device completing a ?rst connection across the
control signal, whereby a substantial change in current
terminals of said power source, a saturable electron ?ow
device including an input electrode and an output elec 40 ?ow is experienced in said second connection with the
generated in the output of said pulse transformer.
device and said load device to the second terminal of said
5. A pulse generator circuit comprising a source of
power source via the input electrode and the output elec
trode of said electron flow device and a winding of said 45 power including a ?rst terminal and a second terminal, a
constant voltage diode device, a ?rst resistance_device,_a
pulse transformer, means for biasing said electron flow.
?rst connection from the ?rst terminal to the second ter
device non-conductive at said control electrode, a source
minal of said source via said diode device and said ?rst
of control signals, and control means connected to said
resistance device, a saturable ?rst electron flow device
control electrode and responsive- to each control signal
from said signal source for biasing said electron ?ow 50 including an input electrode and an output electrode and
a control electrode, a pulse transformer, a second con
device to saturable conduction at said control electrode to
nection from the junction between said diode device and
render said device full conductive between the input and
said ?rst resistance device to the second terminal of said
output electrodes thereof, whereby a substantial current
power source via the input electrode and the output elec
?ow is experienced in said second connection during the
interval of each of said control signals thereby producing 55 trode of said ?rst electron ?ow device and a winding of
ing of said pulse transformer, a second resistance device,
a third connection from the ?rst terminal of said power
60 source to the control electrode of said ?rst electron ?ow
device via said second resistance device, thereby to bias
said electron ?ow device non-conductive between said in
put and control electrodes, a second electron ?ow device
including an input electrode and an output electrode and
65 a control electrode, a fourth connection from said control
electrode of said ?rst electron device to the second ter
minal of said power source via the input electrode and the
output electrode of said second electron device, a source
‘of control signals, and means ,connecting said source of
70 signals to the control electrode of said second electron
?ow device for rendering said device full conductive be
tween the input and output electrodes thereof responsive to
the occurrence of each control signal, thereby to cause cur
rent flow through said second resistance device and to
75 bias said ?rst electron ?ow device to saturable conduction
3,062,969
7
between the input and output electrodes at the control
electrode thereof during the interval of control signal,
whereby a substantial change in current ?ow is experi
enced in said electron ?ow device with the change in state
of said ?rst electron ?ow device from non-conduction to
conduction and high energy pulses are generated in the
output of said pulse transformer.
6. A pulse generator circuit comprising a source of
power including a ?rst terminal and a second terminal, a
constant voltage diode device, a ?rst resistance device, a
8
of said power source via the emitter and collector elec
trodes of said second semi-conductor device, a second uni
directional current device connected for providing a
current path from the base electrode to the collector elec
trode of said second semi-conductor device, a source of
alternating current control signals connected between the
positive electrode of said power source and the base elec
trode of said second semi-conductor device for rendering
said device full conductive in the emitter-collector path
during each positive half cycle of said alternating current
control signals thereby to cause current ?ow through said
second resistance device and to bias said ?rst semi-con
ductor device to saturable conduction between the emitter
and collector electrodes at the base electrode thereof dur
?rst connection from the ?rst terminal to the second ter
minal of said source via said constant voltage diode and
said ?rst resistance device, a saturable ?rst semi-conductor
device including an emitter electrode and a collector elec
trode and a base electrode, a pulse transformer, a second 15 ing the interval of said positive half cycle, whereby a
connection from the junction between said diode device
substantial change in current flow is experienced in said
and said ?rst resistance device to the second terminal of
second connection with change in state of said ?rst semi
said power supply via the emitter and collector electrodes
conductor device from non-conduction to conduction and
of said ?rst semi-conductor device and the primary wind
high energy pulses are produced in the output of said
ing of said pulse transformer, a ?rst unidirectional current = pulse transformer.
device connected across the terminals of the primary
8. The pulse generator circuit set forth in claim 7 where
winding of said pulse transformer for diminishing reverse
in said ?rst and second semi-conductor devices are PNP
current flow in said primary winding, a second resistance
‘type transistors.
device, a third connection from the ?rst terminal of said
9. A pulse generator circuit comprising a source of
power source to the base electrode of said ?rst semi-com 25 power including a positive terminal and a negative ter
ductor device via said second resistance device, thereby
minal, a constant voltage diode device, a ?rst resistance
to bias said ?rst-semi-conductor device non-conductive
device, a ?rst connection from the positive terminal to
between said emitter and coilector electrodes thereof, a
the negative terminal of said source via said diode device
second semi-conductor device including an emitter elec~
and said ?rst resistance device, a pair of saturable ?rst
trode and a collector electrode and a base electrode, a 30 semi-conductor devices each including an emitter elec
fourth connection from said base electrode of said ?rst
trode and a collector electrode and a base electrode,
semi-conductor device to the second terminal or" said
a pair of pulse transformers, a pair of second connections
power source via the emitter and collector electrodes of
each extending from the junction‘ between said diode de
said second semi-conductor device, a source of control sig-'
vice and said ?rst resistance to the negative terminal
nals, and means connecting said source of signals to the
of said power supply via the emitter and collector elec
base electrode of said second semi-conductor device for
trodes of a corresponding ?rst semi-conductor device and
rendering said device full conductive between the emitter
the primary winding of a corresponding pulse trans
and collector electrodes at the base electrode thereof re
former, a pair of ?rst unidirectional current devices each
sponsive to the occurrence of each control signal, thereby
connected across the terminals of the primary winding
to cause current ?ow through said second resistance de 40 of a corresponding pulse transformer for permitting a
vice and to bias said ?rst semi-conductor device to satur
current flow in a direction towards the collector electrode
able conduction between the emitter and collector elec
of the corresponding ?rst semi-conductor device, a pair
trodes at the base electrode thereof during the interval
of second resistance devices, a pair of third connections
of said control signal, whereby a substantial change in
each extending from the positive terminal of said power
current ?ow- is experienced in said second connection 45 source to the base electrode of a corresponding ?rst semi~
with the change in state of said ?rst semi-conductor de
conductor device via one of said second resistance devices,
vice from non-conduction to conduction and correspond
thereby to bias each of said ?rst semi-conductor devices
ing; high energy pulses are produced in‘ the output of
non-conductive between the emitter and collector elec
said pulse transformer.
trodes thereof, a pair of second semi-conductor devices
7. A pulse generator circuit comprising a source of 50 each including an emitter electrode and a collector elec
power including a‘ postive terminal and a negative ter
trode and a base electrode, a pair of fourth connections
minal, a constant voltage diode device, a ?rst resistance
each extending from the base electrode of one of said
device, a ?rst connection from the positive terminal to
?rst semi-conductor devices to the negative terminal of
the negative terminal‘ of said source via said diode device
said power source via the emitter and collector electrodes
and said ?rst resistance device, a saturable ?rst semi-con~
of a corresponding second semi-conductor device, a pair
ductor device including an emitter electrode and a col
of second unidirectional current devices each connected
lector electrode and a base electrode, a pulse transformer,
for providing a current path from the base electrode to
a second connection from the junction between said diode
the collector electrode of a corresponding second semi
device and said ?rst resistance device to the negative
conductor device, a source of alternating current control
terminal of said power supply via the emitter and col 60 signals connected between the base electrodes of said pair
lector electrodes of said ?rst semi-conductor device and
of first semi-conductor devices for rendering said devices
‘the primary winding of said pulse transformer, a ?rst uni
alternately full conductive between the emitter and col
directional current device connected across the terminals
lector electrodes on alternate half cycles thereby to cause
of the primary winding of said pulse transformer for per
current ?ow through corresponding second resistive de
mitting a current flow in a direction toward the collector 65 vices and to bias the connected ?rst semi-conductor
electrode of said ?rst semi-conductor device, a second re
devices to saturable conduction between the emitter and
sistance device, a third connection from the positive ter
collector electrodes at the base electrodes thereof during
minal of said power source to the base electrode of said
the interval of the corresponding half cycle, whereby a
?rst semi-conductor device via said second resistance de
substantial change in current ?ow is experienced in each
vice thereby to bias said ?rst semi-conductor device non 70 of said second connections with the change in state in
conductive between said emitter and collector electrodes
the corresponding ?rst semi-conductor device from non~
thereof, a second semi-conductor device including an
conduction to conduction and from conduction to non
emitter electrode and a collector electrode and a base
conduction and high energy pulses are generated in the
electrode, a fourth connection from said base electrode of
output of the connected pulse transformer.
said ?rst semi-conductor device to the negative terminal
10. A pulse generator circuit comprising a source of
3,062,969
9
10
power including a ?rst terminal and a second terminal,
?rst semi-conductor device from non-conduction to con
duction and from conduction to non-conduction, said
a constant voltage diode device, a ?rst resistance device, a
changes in current ?ow through the primary winding of
said second connection producing a ?rst voltage pulse
?rst connection from the ?rst terminal to the second
terminal of said source via said diode device and said ?rst
resistance device, a saturable ?rst semi-conductor device
and a second voltage pulse at the end therein each of
said secondary windings, and a ?rst unidirectional device
including an emitter electrode and a collector electrode
and a third resistance device connected across the ter
and a base electrode, a pulse transformer including a pri
minals of said primary winding to regulate the rate at
mary winding and a ?rst secondary winding and a second
which the current flow diminishes to correspond to the
secondary Winding, a second connection from the junction
between said diode device and said ?rst resistance device 10 rate at which the current ?ow rises thereby to render
said ?rst and second voltage pulses of equal amplitude
to the second terminal of said power supply via the emit
and duration.
ter and collector electrodes of said ?rst semi-conductor
11. The pulse generator arrangement set forth in claim
device and the primary winding of said pulse transformer,
10 further including a unidirectional current device in
a second resistance device, a third connection from the
?rst terminal of said power source to the base electrode 15 series with said ?rst secondary winding to permit a cur
of said ?rst semi-conductor device via said second resist
ance device, thereby to bias said ?rst semi-conductor
device non-conductive between said emitter and collector
electrodes thereof, a second semi-conductor device in
cluding an emitter electrode and a collector electrode
and a base electrode, a fourth connection from said base
electrode of said ?rst semi-conductor device to the second
terminal of said power source via the emitter and col
leotor electrodes of said second semi~conductor device,
a source of control signals, means connecting said source
rent ?ow therethrough only during the occurrence of
each ?rst voltage pulse and including a unidirectional
current device in series with said second secondary wind
ing -to permit a current ?ow therethrough only during
the occurrence of each second voltage pulse.
12. The pulse generator arrangement set forth in claim
11 wherein said source of control signals provide chain
signals having 50% duty cycle whereby said ?rst voltage
pulse at said ?rst secondary winding is phase displaced
25 from said second voltage pulse at said second secondary
of signals to the base electrode of said second semi-con
ductor device for rendering said device full conductive
between the emitter and collector electrodes at the base
electrode thereof responsive to the occurrence of each
control signal, thereby to cause current flow through 30
said second resistance device and to bias said ?rst semi
conductor device to saturable conduction between the
emitter and collector electrodes at the base electrode
thereof during the interval of said control signal, whereby
a substantial change in current ?ow is experienced in 35
said second connection with the change in state of said
winding by approximately 180°.
References Qited in the ?le of this patent
UNITED STATES PATENTS
2,644,895
2,862,171
2,892,143
Lo ___________________ __ July 7, 1953
Freeborn ____________ __ Nov. 25, 1958
Sommer _____________ __ June 23, 1959
161,448
Sweden _____________ __ Nov. 26, 1957
FOREIGN PATENTS
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