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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.