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Патент USA US2404624

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July 23, 1946.
2,404,624
R. B. DOME‘
VOLTAGE'REGULATOR FOR ELECTRON DISCHARGE DEVICES
Filed Jan. 23, 1943
In‘ventor :
Robert B. Dome,
by 17/
52W 4
is Attorney.
Patented July 23,_1946
2,404,624
UNITED STATES PATENT oFFICEQJ
VOLTAGE REGULATOR FOR ELECTRON v
DISCHARGE DEVICES
Robert B. Dome, Bridgeport, Conni, assignor to
General Electric Company, a corporation of
New York
Application January 23, 1943, Serial No. 473,362
6Claims.
((1315-14)
_.
,
7
.
1
My invention relates to apparatus for the regu
lation of voltages applied to electron discharge
devices, and particularly to apparatus for regulat
ing the voltage applied between the anode and
ratus embodying my invention, and Fig. 2 is a cir-'
cuit diagram illustrating a modi?cation ofa. part‘
of the circuit of Fig. l.
1
.
Referring now to Fig. 1, the apparatus includes
an electron discharge device III of the cathode
ray type, which includes an anode II, a‘ cathode
12, a control electrode l3 and horizontal and ver-'
tical de?ection plates or members I4 and i5,~re:-~
spectively. ‘The device I 0 as illustrated is the’
cathode of electron discharge devices of the cath
ode ray type.
In circuits employing electron discharge de
vices, such as cathode ray tubes, a relatively high
voltage is applied between the anode and cath
ode of the device, and it is desirable to maintain 10 picture tube or the television receiver, a voltage
this voltage constant. In apparatus such'as-os
cilloscopes and television camera and reproduc
ing devices, voltages derived from a common
source are frequently applied to the de?ection
corresponding to‘the‘ picture or~video signalbeing
applied to the grid l3 across a resistor Hi from a
suitable source, not shown, coupled" to theiree
sistor through a condenseri l1. Direct current
plates as well as to the anode-cathode circuit so 15 voltages for supplying the anode voltage and de-'
that variations in the de?ection voltage are pro
?ection voltages of the device I 0 are derived from
portional to variations in the anode cathode volt
age. The intensity of the electron beam in a
cathode ray tube may be controlled by a voltage
applied to a grid or control element.
For exam
ple, this voltage may represent changes in inten
a suitable alternating current supply, ‘not shown,
coupled to a primary 20 of a transformer 2L? A 7
high ‘direct current voltage is applied between
20 the’ anode II‘ and the cathode l2 and is derived
from a secondary winding‘ 22 of the transformer
2! through a half-wave recti?er comprising a
reproduced, and changes in voltage between the
two-electrode electron discharge device 23, and
anode and cathode circuit may result from result
the usual smoothing condenser 24 connected be;
ing changes in the load on the cathode ray tube. 25 tween the cathode 25 of the device 23 and ground,
It is, therefore, desirable to provide some ar
the device 23 having an anode 26 connected to
rangement for preventing variations in the anode
the secondary 22'. One of'each pair of de?ection
voltage caused by changes in the anode current.
plates I4 and I5 is also connected to'the cathode
sity of light in a picture or scene which is being
In many cases it may be desirable to compensate
25 in accordance with the usual practice.’ The
for changes in voltage due to changes in load cur 30 de?ection voltages for the vertical and horizontal
rent, but not to regulate the anode voltage to
plates l4 and I5 are derived from a full-wave rec
prevent changes due to variations in the voltage
ti?er 21. This recti?er includes a secondary
of the common source from which the anode volt
winding 28 of the transformer 2 i, and an electron
age and de?ection voltages are derived.
It is an object of my invention to provide an -'
and 3i connected to opposite ends of the second
improved apparatus for regulating the voltage
applied between the anode and cathode of an elec
tron discharge device.
It is another object of my invention to provide
an apparatus including a cathode ray device and
an improved arrangement for maintaining the
voltage between the anode and cathode of the
cathode ray device constant regardless of varia
tions in the current ?owing in the anode-cathode _
circuit.
The features of my invention which I believe to
be novel are set forth with particularity in the
discharge deViceZB having anodes or plates 30
ary 28, the center point of the secondary being
connected to ground. The device 29 is provided
with a cathode 32, which comprises a ?lamentor
heater connected across a secondary 33 _of- the '
transformer 2|, and the recti?er 21 also comprises
a smoothing ?lter including condensers 734 and 35
connected between ground and either end of va
choke coil 36, and the direct current voltage pro;
duced by the recti?er is applied to vertical and
horizontal de?ection, voltage generators“ and
4|, respectively, the’ recti?er being coupled to the
generators through a resistor 43 and a condenser '
appended claims. My invention itself, however,
44.
both as to its organization and method of opera
includes an electron discharge device 45 con
nected as an oscillator energized by pulses, such
tion, together with further objects and advan- '
tages thereof, may best be understood by refer
ence to the following description taken in con
nection with the accompanying drawing, in
which Fig. 1 is a circuit diagram illustrating sche
matically a portion of a television receiving appa
The vertical de?ection voltage'generator 40
as the vertical synchronizing pulses of atelevisi'on
signal, applied across terminals 46.- The hori
zontal de?ection voltage generator 4i is’an oscil-v
lator similar to that of the generator 40 and is
excited by horizontal synchronizing pulses applied
2,404,624
3
across terminals 41. The generator 40 is coupled
to the plates I5 through a condenser 48, and the
generator 4| is coupled to the plates 1 4 through a
condenser 49.
During the operation of the cathode ray device
ID the load current ?owing between the anode
H and cathode l2 varies and tends to‘ produce
changes in the voltage between the anode and
cathode. In order to prevent changes in volt
age due to the changes in the load current in
the cathode ray device, an electron discharge de
vice 52 is connected in parallel with the device
I0 between the anode H and cathode l2‘. The
4
the device 59, the current drawn by the device 52
compensates for changes in voltage regardless of
whether they are due to changes in load cur—
rent or in applied voltage, or both.
It will be evident that my invention provides
a simple and effective arrangement for regulat
ing the voltage applied across ‘a an electron dis
charge device, such as acathode ray tube so that
the applied voltage is not varied by changes in
load current. As an example, by way of illustra
tion. only, and not by way of limitation, a sat
isfactory regulator embodying my invention, and
which would be suitable for the circuit of Fig. 1,
may be provided by employing a 6F5GT tube as
device 52 includes an anode 53 connected to. the
anode II, a cathode 54 connected to ground 15. the device 52 with a resistance 55 having a value
of 10,000 ohms. This regulator was employed
through a resistance ‘55, and a control electrode
56 connected to an intermediate point of the
resistance 55. The resistance 55 is connected be
tween the output of the recti?er 21 and ground,
and the voltage drop in. the resistor 55 therefore
varies with the voltage of the recti?er. Conse
quently,.the changes in drop across the resistor
with aload circuit at a potential of 2500 volts and
this voltage was maintained substantially con
stant over a wide range of load currents.
Although I have illustrated one embodiment of
my invention in connection with a television re
ceiver, other applications will readily be apparent
to those skilled in the art.. Therefore, it‘ will
be appreciated that I do. not wish to be limited
trol electrode 56, therefore, changes with changes 25 to the particular embodiment of my invention
disclosed herein, and I contemplate by the‘ ap
in the voltage of the source and is proportional
pended claims to cover all-modi?cations-which
tov corresponding changes in the deflection volt
fall within the spirit. and scope. of my invention;
ages. and in the anode voltage of the device it.
What I claim as new and desire to secure by
The bias voltage of the grid 56 is selected so that
Letters Patent of the United' States is:
under the most severe load conditions, when the
1. In combination‘, a ‘?rst electron discharge
current flowing through the device I!) is at its
device having an anode,‘ a cathode and av control
highest value, a very low current in the vicinity
electrode, a source of‘ voltage connectedbetween
of the cut-o? value flows through the device 52.
said anode and said cathode, and-means fonpre
During the operation of the apparatus, when the
venting changes in the voltage between said. ‘an
device I0 draws less current than the maximum
ode and said cathode due to changes in'the cur
value, the device 52 draws more current and, as
rent ?owing therebetween, said means including
a result, the voltage across the parallel circuit
a second electron discharge device‘ connected‘in
including the anode l I and the cathode 12 of the
parallel with the anode to cathode path of. said
device l0 does not rise appreciably. Since the
bias voltage on the control electrode 56 varies 40 ?rst device and having an anode and a- cathode
and a control electrode, said means also‘v includ
with the direct current voltage applied to the an
ing means connected in the cathode circuit of
odes H and 53, as a result of line voltage changes
said second device for providing a predetermined
at primary 20, the device 52 does not regulate
bias on said control electrode of said second de
for‘ changes in the applied anode voltage because
vice whereby current flows through said second
the cut-off point of the device 52 moves in direct
device to'compensate for changes in current ?ow‘
proportion to the change in the applied voltage
ing between the anode and. cathode of said ?rst
and but little increase in current through the de
device.
.
vice 52 results.
2. In combination, a ?rst electron discharge
Should it be desired to regulate both for
device having an anode and a cathode and a
changes in load current in the cathode ray de
control electrode, a, source of voltage connected
vice and for changes in the applied voltage de
between said anode and said cathode, and means
rived from the source connected to the primary
for preventing changes in the voltage between
20, the circuit of Fig. 1 may be changed in ac
said anode and said» cathode due‘ to changes in
cordance with Fig. 2 which illustrates the portion
of the circuit of Fig. 1. including the device 52 55 the current flowing therebetween, said means in
cluding a second electron discharge device con
and the ?lter condensers and inductance of_ the
nected in parallel with the anode to cathode path
recti?er 21. Corresponding elements of Flg. 2
of said ?rst device and having an anode and a
are designated by the same numerals as in Fig.
cathode and a control electrode, said’ means also
1. The resistance 55 of Fig. 1 is replaced in
Fig. 2 by a resistance 58 connected between the 60 including a constant voltage device connected in
the cathode circuit of said second device for pro
cathode 54 and ground, but not connected to
viding a predetermined substantially constant bias
the direct current supply from the recti?er 21.
on said control electrode of said secondv device
A constant voltage device 59 is connected across
whereby current ?owsthrough said seconddevice
resistance 58. The device 59 may, for example,
be a neon tube which maintains substantially 65 to compensate for changes in current ?owing be
tween said anode and cathode of said first device
constant voltage over a wide range of current
and to maintain the voltage between said anode
?owing therethrough. The point at which the
and cathode of said ?rst device substantially con
control electrode 56 is connected to the resistance
stant regardless of variations in the voltage of
58 is selected, so that, at the lowest voltage ap
plied to the anode II and at the greatest load 70 said source.
3. In combination, a- ?rst electron discharge
current, the device 52 is biased almost to cut-off
device having an anode and a~cathode and’ a
and draws very low current. Then, as the volt
control electrode, a source of voltage connected
age rises across the device 52, a larger current
between said anode and said cathode; and means
will be drawn thereby, and since the bias on the
grid 56 is maintained substantially constant by 75 for preventing changes in the voltage between
55 follow changes in the voltage of the source
applied to the primary 20. The bias on the con
2,404,624
5
said anode and said cathode due to changes in
the current ?owing therebetween, said means in
cluding a second electron discharge device con
nected in parallel with the anode to cathode path
of said ?rst device and having an anode and a
6
for preventing changes in the voltage between
said anode and said cathode due to changes in
the current ?owing therebetween, said last men
tioned means including an electron discharge de
vice having an anode and a cathode and a con
trol electrode and connected between the anode
cathode and a control electrode, said means also
and cathode of said cathode my device, said last
including means connected in the cathode circuit
mentioned means also including means connect
of said second device to produce a voltage vary
ed in the cathode circuit of said electron dis
ing in accordance with the voltage of said source
for providing a predetermined bias on said control 10 charge device for providing a predetermined bias
on the control electrode thereof whereby current
electrode of said second device whereby the volt
?ows through said electron discharge device to
age across said second device varies with the
compensate for changes in current ?owing be
voltage of said source but is independent of vari
tween the anode and cathode of said cathode ray
ations due to changes in current ?owing through
device.
said ?rst device.
6. In combination, a cathode ray device having
4. In combination, a cathode ray device hav
ing a cathode and a control electrode and an
anode and de?ection members, a source of vari
able voltage, means energized from said source
a cathode and an anode and a control electrode
and vertical and horizontal de?ection members,
a source of variable voltage, means energized from
for supplying de?ecting voltage to said de?ection 20 said source for supplying de?ecting voltages to
said de?ection members and for supplying anode
members and for supplying anode voltage be
voltage between said cathode and said anode
tween said cathode and said anode whereby said
whereby said de?ecting and anode voltages are
de?ecting and anode voltages tend to be subject
subject to variations in the voltage of said source,
for preventing changes in the voltage between 25 and means for preventing changes in the voltage
between said anode and said cathode due to
said anode and said cathode due to changes in
changes in the current ?owing therebetween, said
the current ?owing therebetween, and means as
last mentioned means including an electron dis
sociated with said last mentioned means for ef
charge device having an anode and a cathode
fecting operation thereof to prevent changes of
voltage at said de?ecting members and at said 30 and a control electrode and connected between
the anode and cathode of said cathode ray device,
anode due to variations in the voltage of said
said last mentioned means also including a volt
source.
age supply connected in the cathode circuit of
5. In combination, a cathode ray device having
said electron discharge device and subject to the
a cathode and a control electrode and an anode
and de?ection members, a source of variable volt 35 variations in the voltage of said source for pro
to variation in the voltage of said source, means
age, means energized from said source for sup
viding a bias on the control electrode thereof
plying de?ecting voltage to said de?ection mem
bers and for supplying anode voltage between
said cathode and said anode whereby said de
?ecting and anode voltages are subject to vari 40
ations in the voltage of said source, and means
whereby current ?ows through said electron dis
charge device to compensate solely for changes
in current ?owing between the anode and cath
ode of said cathode ray device.
ROBERT B. DOME.
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