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Патент USA US3051909

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Aug. 28, 1962
P. E. CARROLL
3,051,907
BIDIRECTIONAL TRISTABLEZ ELECTRONIC CIRCUIT EMPLOYING
Filed Dec. 17, 1958
INTERNATIONAL. ECCLES-JORDAN FLIP-FLOPS
2 Sheets-Sheet 1
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INVENTOR
PauL E. Carrolé
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Aug‘. 28, 1962
P. E. CARROLL
3,051,907
BIDIRECTIONAL TRISTABLE ELECTRONIC CIRCUIT EMPLOYING
INTERNATIONAL ECCLES-JORDAN FLIP-FLOPS
Filed Dec. 1'7, 1958
2 Sheets-Sheet 2
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PAUL E.CARROLL
INVENTOR
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ATTORNEYS
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3,051,907.
Patented Aug. 28, 1962
1
2
3,051,907
and resistor 19, while the plate of tube 11 is connected
to ground by means of capacitor>20 and resistor 21. A
pair of diodes I22 and -23 are connected in opposite pol
arity to each other and in series with capacitors 18 and 20.
BIDIRECTIONAL TRISTABLE ELECTRONIC CIR
CUiT EMPLOYING INTERNATIONAL ECCLES
JORDAN FLIP-FLOPS
The grid of tube 10a is connected by means of a capacitor
25a to terminal 24a which serves as the input terminal for
the ?ip-?op circuit a. Similarly, the grid of tube 11b
is connected through capacitor ‘25b to terminal 24b which
serves as the input terminal for the ?ip-?op circuit b.
Paul E. tiarroll, Houston, Tex., assignor to Texas Instru
ments Incorporated, Dallas, Tex., a corporation of
Delaware
Filed Dec. 17, 1953, Ser. No. 781,057
4 Claims. (Cl. 328-405)
10
This invention relates to a tristable electronic circuit
adapted for such purposes as controlling the speed of a
servo motor.
"ice
The three states can be made to correspond
respectively to increasing the speed of the motor, decreas
ing it, or essentially leaving the speed unchanged.
vIt is a primary object of the present invention to pro
The point interconnecting diodes ‘22a and 23a of ?ip
?op circuit a is grounded through a resistor 26a and is
also connected by means of resistor 20a and capacitor
28a to the grid of tube 10b of ?ip-?op circuit b. Simi
larly the point in ?ip-?op‘ b which interconnects diodes
22b and 23b is grounded through resistor 26b and is also
connected by means of a resistor 27b and a capacitor 28b
low error information rate. Another object is to provide
a circuit having three stable states and being adapted to
switch between the stable states in response to pulses ap
plied to ‘a pair of inputs.
In accordance with the stated objective a bidirectional
electronic circuit is provided in which two Eccles-Iordan
to the grid of tube 11a of ?ip-?op circuit a.
_ Operation of the bidirectional tristable electronic cir
cuit is as follows. The “neutral” state is de?ned as exist
ing when tubes 11a and 10b are conducting, with tubes
10a and 11b cut off, the plate voltages of these tubes ap
pearing as seen in FIGURES 2c-2f. A positive pulse 34
as seen in FIGURE 2a now applied to terminal 240
type vacuum tube ?ip-?ops are interconnected to form a
causes the state of ?ip-flop a to change, with tube 10a
vide a device for controlling a servo system with a very
tristable device. The circuit has two inputs, each directly 25 conducting, and tube 171a cut o?f. As tube 11a cuts off,
its plate is brought to a potential of +V. This causes
connected to one grid of each ?ip-?op. The output of
diode 23a to conduct, and the current through diode 23a
each ?ip-?op is connected through diiferentiating and full
and resistor 27a is coupled by capacitor 28a to the grid
wave rectifying means to the non-input grid of the other
?ip-?op.
Whereas vacuum tubes are described by way
oftube 10b. Since tube 1% is conducting the trigger
of example, it will be appreciated that other like circuit 30 ing potential has no veffect, and the state of ?ip-?op b
remains unchanged. Thus an input applied to ?ip-?op‘ a
elements can be used such as transistors, relays, magnetic
has caused the state of ?ip-?op a to change while leaving
ampli?ers, etc.
the state of ?ip-?op b unchanged. The existing com
The tristable circuit is initially in What shall be termed
bination of conditions, i.e., tubes 10a and 10b conducting
the “neutral” state. An input pulse applied to one of the
?ip-?ops puts the tristable device in what shall be termed 35 with tubes 11a and 11b cut off is de?ned as the “plus”
state, and when the tristable circuit is in such a state a
as the “plus” state. Further inputs to the ?rst ?ip-?op
signal is sent to an associated servo motor causing its
have no additional e?ect, i.e., the device remains in the
speed to increase.
“plus” state. An input now applied to the other ?ip-?op
returns the device to the “neutral” state. Another input
now applied to the second ?ip-?op places the device in
what shall be termed as the “minus” state, and additional
inputs to the second ?ip-?op have no effect, since the tri
stable device remains in the “minus” state. A pulse now
applied to the ?rst ?ip~?op returns the device to the
45
“neutral” state.
Other objects, advantages, and characteristic features
of the present invention will become readily apparent upon
Positive pulses such as a pulse 35 of FIGURE 2a now
applied to terminal 24a of ?ip-?op a have no eifect on
the circuit, since tube 10a is already conducting. Hence
the states of both ?ip—?ops remain unchanged, and a
speeddup signal is still sent to the servo motor.
If a positive pulse 36 as seen in FIGURE 2b is now
applied to terminal 24b of ?ip-?op b, tube 11b is caused
to conduct while tube 10b becomes cut o?, thus reversing
the state of ?ip-?op b. As tube ‘10b is cut oif, its plate is
brought to a potential of +V, and diode 22b is caused
to conduct. Capacitor 28b couples the voltage to the
consideration of the following detailed description of a
preferred embodiment of the invention when taken in
50 grid of tube 11a. This causes tube 11a to conduct and
conjunction with the accompany drawing wherein:
tube 10a to cut 011?, thus resetting ?ip-?op a. When tube
FIGURE 1 is a schematic circuit diagram of a pre
10a cuts o?, diode 22a is caused to conduct. Capacitor
ferred embodiment of the invention; and
28a couples the positive triggering potential to the grid
FIGURES Za-Zf are graphic representations of voltage
of tube 10b to cause tube 10b to conduct and to cut off
waveforms appearing at various points in the circuit of
55 tube 11b, thus resetting ?ip-?op b. The ensuing output
FIGURE 1.
from ?ip-?op b, which now applies a triggering potential
Referring now to FIGURE 1, the tristable circuit of
to the grid of tube 11a, has no e?ect since tube 11a is
the present invention consists of a pair of interconnected
Eccles-lordan type ?ip-?op circuits, one designated gen
erally by the letter a, the other by the letter b. Each ?ip
conducting. The tristable circuit is now in its original
10 and 11, the cathodes of which are connected together
and grounded through a resistor 30. The plate of vac
applied to input terminal 24b of ?ip-flop b, tube 11b is
state and no corrective signal is sent to the servo motor.
?op circuit is constructed around a pair of vacuum tubes 60 If a positive pulse 37 as seen in FIGURE 2b is now
uum tube 10 is connected to the grid of vacuum tube 11
caused to conduct while tube \10b is cut o?f, thus changing
the state of ?ip-?op b. The subsequent output pulse
from ?ip-?op b has no eifect on tube 111a since tube 11a
through a resistor 12, while the plate of vacuum tube ‘11
is attached to the grid of vacuum tube 10 by means of 65 is conducting. The combination of conditions among the
resistor 13. The grid of tube 10' is grounded through
?ip-?ops with tubes 11a and 11b conducting ‘and 10a and
10b cut off is de?ned as the “minus” state, and when the
resistor 14, while a resistor 15 connects the plate of tube
circuit is in this state a signal is sent to decrease the speed
10 to a positive bias. Similarly the grid of vacuum tube
of the servo motor.
11 is grounded by means of resistor 16, while resistor 17
70 [If additional pulses such as a pulse ‘38 as seen in FIG
connects the plate of tube 11 to the positive bias.
URE 2b are now applied to terminal 24b of ?ip-?op b
The plate of tube 10 is grounded through capacitor 18
3,051,907
3
they have no eifec't since tube 11b is conducting.
4
Hence, ’
vacuum tubes being connected together and the plate of
each vacuum tube being connected to the grid of the other
the tristable circuit remains in the “minus” state, and
signals are still sent to decrease the speed of the servo
vacuum tube, and wherein said ?rst and said second out
put means each includes a pair of diodes connected in
motor.
If the next input pulse such as a pulse 39 as‘ seen in 5 series and in opposing polarity between the respective
FIGURE 2a is applied to terminal 24a of the ?ip-?op a
plates of said ‘vacuum tubes and a connection from a point
the state of ?ip-?op a is changed, the subsequent output
located between said diodes to the other bistable ?ip
pulse from ?ip-?op a resetting ?ip-?op b in the process.
?op circuit.
The output from ?ip-?op b then resets ?ip-?op a so that
3. A bidirectional tristable electronic circuit comprising
both ?ip-?ops are put in their original states, the overall 10 a pair of bistable ?ip-?op circuit means each including a
circuit thus being returned to the “neutral” state.
pair of amplifying means, independent ?rst and second
Whereas the diodes 22a, b and 23a, [7 are shown poled
inputs, said ?rst input coupled to one amplifying means
to pass positive pulses, it will be appreciated that their
of one of said ?ip-?op circuit means, said second input
polarity could be reversed and the circuit arranged to
coupled to one amplifying means of the other of said
operate responsive to negative pulses. This is also true 15 flip-?op circuit means, ‘and further circuit means inter
regarding the driving pulses applied to the inputs.
connecting the output of each said ?ip-?op circuit means
Although the present invention has been shown and
to the non-input amplifying means of the other ?ip-?op
described with reference to a particular embodiment,
circuit means, said tristable electronic circuit assuming a
nevertheless various changes and modi?cations obvious
‘?rst stable state if an input signal is ‘applied to said ?rst
to one skilled in the art are within the spirit and the scope, 20 input when said tristable electronic circuit is in a second
and contemplation of the invention.
stable state, said tristable electronic circuit assuming said
What is claimed is:
second stable state if an input signal is applied to said
1. A tristable electronic circuit comprising a pair of
?rst input when said tristable electronic circuit is in a third
interconnected bistable ?ip-?op circuits and independent
stable state, said tristable electronic circuit also assum
?rst and second inputs, said ?rst input being connected 25 ing said second stable state if an input signal is applied
to one of said bistable flip-?op circuits and said second
to said second input when said tristable electronic circuit
input being connected to the other of said bistable ?ip
is in said ?rst stablev state, and said tristable electronic
?op circuits, said tristable electronic circuit assuming a
circuit assuming said third stable state if an input signal
' ?rst stable state if an input signal is applied to said ?rst
is applied to said second input when said tristable elec
input when said tristable electronic circuit is in ‘a second 30 tronic circuit is in said second stable state.
stable state, said tristable electronic circuit assuming said
4. A bidirectional tristable electronic circuit as de?ned
second stable state if an input signal is applied to said ?rst
in claim 3 wherein said further circuit means includes
input when said tristable electronic circuit is in a third
differentiating and full wave rectifying means.
stable state, said tristable electronic circuit also assuming
said second stable state if an input signal is applied to said 35
References Cited in the ?le of this patent
second input when said tristable electronic circuit is in
said ?rst stable state, and said tristable electronic circuit
assuming said third stable state if an input signal is applied
to said second input when said tristable electronic circuit
is in said second stable state.
‘2. A tristable electronic circuit according to claim 1
wherein each said bistable flip-?op circuit comprises a
pair of vacuum tubes, the respective cathodes of said
_
40
UNITED STATES PATENTS
2,246,803
Lee _________________ __ June 24, 1941
2,410,156
Flory ____________ -4.--“ Oct. 29, 1946
2,497,962
. 2,901,608
2,902,600
Shepard _____________ __ Feb. 21, 1950
Paulsen et al __________ __ Aug. 25, 1959
CO?'lIl _________________ __ Sept. 1, 1959
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