Патент USA US2405237код для вставки
Patented Aug. 6, 1.946 2,405,237 UNITED STATES PATENT OFFICE , ELECTRONIC TRIGGER CIRCUIT WITH THEE-DELAY Arthur J. Ruhlig, Washington, D. C. Application October 4, 1941, Serial No. 413,694 5 Claims. (Cl. 250-27) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757‘ 1 2 This invention relates to electrical apparatus for generating rectangular pulses, and more par ticularly to an apparatus for producing a rec tangular pulse upon application of a single mo eluding novel means wherein the potential of the output terminal abruptly changes, upon ap plication of a momentary voltage at the input terminal, to a value independent of the applied voltage, and wherein the potential of the output mentary pulse thereto. Various electrical apparatus have been provided heretofore, such as non-oscillating multivibrators, terminal remains at such value for a predeter~ mined period of time determined by certain com for generating a pulse upon application of a single ponents of the apparatus. momentary pulse to the circuit. However, the Still another object is to provide an electrical apparatus including a pair of electron discharge devices interconnected in such a manner whereby the potential of the devices is normally main tained at- a predetermined value, and wherein the potential of one of the devices abruptly varies upon application of a single momentary pulse prior arrangements are not adequate in that the magnitude and time-interval of the produced pulse is either dependent upon the character of the applied pulse or is so limited by inherent char acteristics of the circuit that a pulse suitable for numerous applications cannot be obtained there ‘ by. Moreover, the circuits of the prior apparatus are extremely complex which tends to produce ,\ thereto‘to abruptly vary the potential of the other device to a second predetermined value. excessive regenerative action therein as well as Other objects and features of the invention will appear more fully from the following detailed reducing the ei?ciency and reliability of the ap paratus. 20 description when. considered together with the It is therefore an object of the present inven accompanying drawing which disclosed one em tion to provide an electrical apparatus of such bodiment of the invention. It is to be expressly construction to overcome the disadvantages enu understood, however, that the drawing is designed merated heretofore. for purposes of illustration only, and not as a Another object‘is to provide an electrical ap 25 de?nition of the limits of the invention, reference paratus having novel means for producing, a rec being had to the appended claims for the latter tangular shaped pulse upon application of a single purpose. momentary pulse thereto. Another object is to provide in an electrical ap paratus of the above character novel means for determining the time-interval of the produced pulse independently of the applied pulse. Another object is to provide an electrical ap paratus of comparatively simple construction for reliably producing an electrical impulse upon ap plication of a single momentary pulse to the cir cuit. In the drawing: ' ' Fig. l is a schematic illustration of an elec trical apparatus embodying the principles of the present invention; Fig. 2 shows the voltage curve of a pulse pro duced by the apparatus disclosed in Fig. 1, and . Fig. 3 shows the voltage curve of the single , momentary pulse applied to the apparatus shown in Fig. 1 to cause generation of the pulse dis closed in Fig. 2. Still another object of the invention is to pro Referring more particularly to Fig. l of the vide an apparatus of the above type wherein the drawing, an electrical apparatus embodying the. magnitude and time-interval of the produced 40.. principles of the present invention is disclosed pulse are independent of similar characteristics therein including a pair of electron discharge of the applied pulse. _ devices I0 and I I, of the triode type, each respec Still another object is to provide an electrical tively having a cathode I2 and I3, an anode I 4 apparatus of the foregoing character wherein the 1 and I5, and a control electrode i6 and I1. When magnitude and time-interval of the produced e a more compact arrangement is desired, the elec pulse is determined by certain components of the trodes of devices I0 and II may be included in a apparatus and which may be easily varied single envelope, such as a duplex-triode, for ex throughout wide limits. ample. ‘I‘he cathodes I2 and I3 are connected to Still another object is to provide an electrical gether and are in turn connected to ground po apparatus for generating an electrical pulse upon tential through common resistance I8, whereas application of a single momentary pulse thereto the anodes of each of the devices are maintained of such construction to reduce regenerative ac positive‘ with respect to the cathodes by map tion to a minimum. Still another object is toprovide an electrical apparatus having input and output terminals in propriate source of potential I9, the positive ter minal of which is connected to anodes I4 and I5 through, resistances 2B and 2| respectively.w Con- - 2,405,237 ' K ' 3 4 trol electrode l6, of device 10,, is connected to ground potential through resistance 22, while control electrode 11 is connected to the positive terminal of source I9, through variable resistance decrease to a substantially zero value after lapse of such predetermined period of time. As shown in the drawing, such means includes capaci tance 24 and resistance 23, which function to 23, in order that devices It and H may be con maintain control electrode H su?iciently nega tively biased, following the ?ow of the large nega tive pulse thereto, for a period of time equal to the product of the values of the capacitance and trolled. For a purpose that will appear more fully hereinafter, control electrode I‘! is also con nected to anode M, of device I0, through capaci tance 24. An input terminal 25 is connected to resistance. The capacitance and resistance are the cathodes through suitable capacitance 26, and 10 to be selected to provide the time-delay desired, an output terminal 21 is provided which is con or to determine the time-interval during which it nected between anode l5 and resistance 2!, thus is desired to maintain the output terminal at a segregating the same from other components of high potential. During such time interval the the circuit to thus reduce regenerative action to negative bias on control electrode I‘! gradually ‘ > 15 leaks o?, and after lapse of the predetermined With the foregoing construction, a positive bias period of time, the control electrode will be is normally maintained on control electrode ll of driven positive, which abruptly allows device H such value that device I i draws current, and re to again draw current. At the instant device H sistance 2| is selected to provide a drop in po commences to’ draw current the potential at the tential at anode l5 whereby the potential of out 20 output terminal abruptly drops to a substantially put terminal 21 will normally be maintained at zero value, because of the drop of the voltage at a substantially zero value. Resistance 18 is prop resistance 2|. Resistance 23 may be of the vari erly selected to provide a drop in potential at able type, if desired, so that the time-interval of high potential at output terminal v2'! may be control electrode l6,‘ when device [I draws cur rent, so that control electrode 16 is normally manually varied throughout certain limits. Dur biased to a su?icient negative value to cut oil ing the time-interval when device I I is not pass device l0 and thus prevent anode M from draw ing current, there will be a small drop of voltage ing current. Anode l4, therefore, will normally at resistance 18, and consequently device It) will be maintained at high potential, substantially be drawing current throughout such interval. equal to the potential of source I9. However, at the instant device ll again com As heretofore stated, the present invention pro mences to pass current, the drop in voltage at vides means for abruptly varying the potential resistance l8 will increase to thereby cause de of device I0 upon application of a singlemomen vice IE to return to the normal state wherein tary pulse atinput terminal 25, to abruptly vary no anode current is ?owing and the anode is the potential of device H, and hence output ter 35 maintained at a high potential, substantially minal 21, to a second predetermined value. It equal to the potential of source l9. aminimum. has been found when a single momentary nega tive pulse, of any suitable magnitude greater than a few volts, is applied to input terminal 25, the potential di?erence between control electrode it and cathode I2 suddenly changes and allows de vice lll to abruptly draw current. At the instant With reference to Figs. 2 and 3, curves of the output and input voltages, and the relationships therebetween are respectively shown. The poten tial of the output terminal is shown at a sub stantially zero value until the input voltage is impressed on the circuit, at which instant, the output voltage abruptly increases to a predeter current ?ows in device ID a sudden drop in po tential at anode l4 occurs because of the drop mined value, determined by certain components of the voltage at resistance '20. The extent of 45 included in vthe circuit, independently of the such potential drop at anode i4 depends upon resistance 20, which is to be of such value as to provide a comparatively large drop in potential following the instant the input pulse is applied to the input terminal. At the instant the poten 50 magnitude of the input voltage. The output volt age then remains substantially constant at the high value for a predetermined time-interval T, such interval being determined by the product of the value of capacitance 24 and resistance 23. When time-interval T lapses, the output voltage abruptly drops to a substantially zero value, and remains at such value until a momentary input tial of anode 14 drops a large negative pulse is transferred through capacitance 24 to control electrode ll, of device H, to drive the control electrode su?iciently negative to abruptly out off voltage is again applied to the circuit, in which this device and abruptly terminate the flow of 55 case the foregoing operation would reoccur. From the above it can be readily seen that the anode current. When the device H ceases to output voltage, or the potential of the output draw current the potential of anode l5, and hence thepotential of output terminal 21, will abruptly terminal, is entirely independent of the char acteristics of the input voltage, the latter only high value substantially equal to the potential of 60 functioning as a trigger to initiate generation of the output pulse, source [9. When it is desired to utilize a posi increase, from the substantially zero value to a The present invention thus provides a novel electrical apparatus ‘for generating a rectangular pulse upon application of a single momentary abruptly draw current, such input voltage is ap plied to the control electrode 16 through an input 65 pulse thereto. The apparatus is of such con terminal 28 and capacitance '29, shown in broken struction and operates in such a manner that lines on the drawing; ‘ the magnitude and time-interval of the output pulse is entirely independent of magnitude and Inaccordance' with the principles of the pres ent invention means ‘are provided for maintain time interval of the input pulse. The apparatus ing the output terminal at a substantially con 70 is further characterized by novel construction stant high predetermined potential throughout a wherein the output terminal is not connected predetermined period of time, independently of adjacent to other components of the circuit thus the time-interval of the single momentary pulse reducing regenerative action to aminimum, and applied at input terminal 25, and forabruptly thus operating at a high efficiency and in a re tive momentary pulse to change the bias on con trol electrode [6, in order to cause device I0 to causing the potentialiof the output terminal to‘ 15' liable manner. 5 2,405,237 Although only one embodiment of the present invention has been shown and described in de tail heretofore, it is to be expressly understood that various changes and substitutions may be made therein without departing from the spirit of the invention, as well understood by those skilled in the art. Reference therefore will be 6 3. In an apparatus for producing a rectangular pulse in response to a single momentary pulse applied thereto, comprising a pair of vacuum tubes each having a cathode, control electrode L1 and an anode, a source of potential, circuit means connecting said source to said tubes in such a manner to maintain the anodes positive had to the appended claims as a de?nition of the with respect to the cathodes, a resistance in each limits of the invention. anode circuit, a resistance common to both The invention described herein may be manu 10 cathode circuits, an output terminal connected factured and used by or for the Government of between the anode and corresponding anode re the United States of America for governmental sistance of one of said tubes, means normally purposes without the payment of any royalties applying a positive bias on the control electrode thereon or therefor. of said one tube whereby the anode draws cur What is claimed is: rent and the potential on the output terminal is 1. In an apparatus for producing a rectangular substantially zero, means maintaining a negative pulse upon application of a single pulse thereto bias on the control electrode of said other tube comprising a pair of electron discharge devices whereby the anode of said other tube does not each having at least a cathode, anode and con draw current and is at a high potential, means trol electrode, an input terminal connected to applying a single momentary pulse to the cathode the cathode of one of said devices, an output of said other tube whereby the anode of said terminal connected to the anode of the other other tube draws current causing a potential device, means normally maintaining the anode drop at the anode thereof, means including of said other device at substantially zero poten capacitance means connecting the control elec tial, means normally maintaining the anode of trode of said one tube to the anode of the other said one device at a high potential, means caus tube whereby a negative bias is applied to the ing a drop in the potential of the anode of said control electrode of said one tube upon drop one device upon application of the single pulse in potential at the anode of said other tube thus at said input terminal, means responsive to the causing an abrupt cessation of current ?ow drop in potential at the anode of said one device therein and abruptly increasing the potential of for causing an increase in the potential of the the anode thereof, and resistance means con anode of said other device, and means responsive nected to the control electrode of said one tube to a potential increase at the anode of said other for maintaining the negative bias on the con device for further reducing the potential at the trol electrode thereof for a predetermined period anode of said one device, the last-named means of time. including a direct connection between said 4. In an apparatus of the class described, a cathodes. pair of vacuum tubes each having a cathode, an 2. In an apparatus for producing a rectangular anode and a control electrode, a source of poten pulse upon application of a single pulse thereto tial, means including a resistance connected to comprising a pair of electron discharge devices each of said anodes for applying positive po each having at least a cathode, anode and control electrode, an input terminal connected to the cathode of one of said devices, an output ter tential ‘from said source to said anodes, resist ance means for applying the positive potential of said source to the control electrode of one of minal connected to the anode of the other de- _ said tubes, resistance means applying negative vice, means normally maintaining the anode of said other device at substantially zero potential, means normally maintaining the anode of said potential from said source to the control elec trode of the other tube, means including a re sistance connecting both of said cathodes to neg one device at a high potential, means causing ative potential of said source, and a condenser a drop in the potential of the anode of said coupling the anode of said other tube to the con one device upon application of the single pulse trol electrode of said one tube. at said input terminal, means responsive to the 5. In apparatus of the class described, a pair drop in potential at the anode of said one de of vacuum tubes each having at least a cathode, vice for causing an increase in the potential of. an anode and a control electrode, means applying the anode of said other device, means including a positive potential to said anodes, means in a resistance common to both of said cathodes cluding a resistance common to the cathodes of for'further reducing the potential at the anode each of said tubes, means biasing the control of said one device upon said potential increase electrode of one of said tubes negative with re at the anode of said other device, and means spect to its cathode, a condenser coupling the for maintaining the potential of the anode of anode of said one tube to the control grid of said other device at said increased value for a 60 the other said tube, and means applying a posi predetermined period of time and for abruptly tive bias to the control electrode of said other varying the potential therof to a substantially tube thereby normally sustaining said other tube zero value after lapse of said predetermined conducting and said one tube non-conducting. period of time. ARTHUR J. RUHLIG.