US2476164A - Circuit arrangement for generating a sawtooth-shaped current in a coil - Google Patents

Circuit arrangement for generating a sawtooth-shaped current in a coil Download PDF

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Publication number
US2476164A
US2476164A US17246A US1724648A US2476164A US 2476164 A US2476164 A US 2476164A US 17246 A US17246 A US 17246A US 1724648 A US1724648 A US 1724648A US 2476164 A US2476164 A US 2476164A
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United States
Prior art keywords
winding
anode
cathode
sawtooth
circuit
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Expired - Lifetime
Application number
US17246A
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English (en)
Inventor
Schenau Bernardus Willem Ingen
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2476164A publication Critical patent/US2476164A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/42—Flyback transformers

Definitions

  • the invention relates to a circuit-arrangement for producing in a coil a sawtooth-shaped current with the aid of a discharge tube to which a sawtooth-shaped voltage is supplied, wherein the anode circuit of this tube includes the primary Winding of a transformer and the coil is connected to a secondary winding of this transformer, a diode being connected into the said circuit so as to be conductive during the stroke of the sawtooth-shaped current.
  • the cathode of the diode is connected to that point of the circuit at which during the fly-back of the current occurs in the anode circuit the highpulse-voltage of, for example, 4000 volts or upwards, the said point being that end of the primary winding of the transformer which is located near the anode of the discharge tube.
  • the fiy-back time of the sawtooth-current is determined by the first half-period of the natural oscillation of the circuit formed by the self-induction of the transformer and the capacities of the latter and of the tube and the wiring system and mostly this time should be as short as possible.
  • the supply of the cathode of the emciencydiode must be effected in a substantially capacity-free manner, which, on account of the fact that, in addition, this supply must be realised in an insulated manner with respect to the high pulse-shaped voltages produced, entails additional difiiculties.
  • the circuit-arrangement according to the invention obviates these disadvantages and exhibits the feature that the cathode of the diode is connected to that end of the primary transformer Winding which is remote from the anode of the discharge tube, and that a second secondary transformer winding is included in the anode circuit of the diode.
  • the cathode of the diode is consequently connected to a point at which occurs only a comparatively low directvoltage, viz. the positive voltage of the anodevoltage source of the discharge tube, so that the supply of this cathode does not entail additional disadvantages.
  • Fig. 1 represents, by way of example, a circuit-arrangement according to the invention.
  • Fig. 2 represents, by way of example, a transformer for use in Fig. 1.
  • Input terminals I and 2 of the control-grid circuit of a discharge tube 3 in Fig. 1 have supplied to them a sawtooth-shaped voltage which is taken, for example, from a blocking oscillator.
  • this oscillator may be synchronized by the supply of line synchronizing pulses.
  • the anode circuit of the tube includes the primary winding 4 of a transformer 5 to the secondary winding 6 of which are connected defiector coils i destined to bring about, for example, the horizontal deflection of the cathode ray beam of a cathode ray tube.
  • the transformer 5 comprises another secondary winding 8 which is included in the anode circuit of an efl'iciency-diode 9 the cathode H) of which is connected to the positive terminal H.
  • the deflector coils I may be coupled directly to the winding 8, in which event, however, high voltages are set up across the coils 1. If, on the other hand, we wanted to avoid this disadvantage by means of another transformation ratio between the windings 4 and 8, the diode 9 must have a low internal resistance, which can be realised with great difliculty only.
  • the transformer is constructed in such manner that no coupling or substantially no coupling exists between the stray self-induction of the primary winding 4 with respect to the second secondary winding 8, on the one hand, and that of the latter winding with respect to the other secondary winding 6 to which the deflector coils are connected, on the other hand, for it has been found that due to the existence of coupling between these stray self-inductions in the windings 4 and 8 a line raster free of disturbances may now be described if the coupling between the stray self-inductions of the windings.
  • Fig. 2 represents, by way of example, a trans-;-
  • a cylindrical core l3 of magnetic material has provided onit a secondary I winding I4 which extends for a distance-smaller 1 than the length of the core.
  • the coils 7 of Fig.1 are connected to this winding. Outside thereof is provided the secondary winding I5, which is includedin the diode circuit and which extends over a distance exceeding the length of the winding [4.
  • the winding i is surrounded by the primary winding l6.
  • An electrical circuit arrangement forproducing a saw-toothshaped current in the deflection coil of a cathode ray tube comprising an' electron discharge tube having'a cathode, a control grid and an anode, means to apply a sawtooth shaped voltage to the cathode and control grid, a transformer comprising a high impedance primary winding havin the ends thereof spaced apart and having one end thereof connected to the anode, a low impedance secondary winding and a high impedance tertiary winding, a source of potential having the negative pole thereof connected to the cathode and having the positive pole thereof connected to the other end of said primary winding, means to couple the secondary winding to the said deflection coil, and a diode element having a cathode connected to the end'of the primary vwnding remote from the said anode and having an anode connected to saidtertiary winding.
  • An electrical circuit arrangement for producing a saw-tooth shaped current in the deflection coil of a cathode ray tube comprising an electron discharge tube-having a cathode,.a control grid and an anode, means to app y a wtooth shaped voltage to the cathode and control grid, a transformer comprising a high impedance primary windinghaving" the; ends thereof spaced apart and havin one end'therecf connected to the anode, a low impedance secondary winding and a high impedance tertiary winding having the-ends thereof positioned adjacent the respective ends of the primary winding, a source of potential having the'negative pole thereof connected to the cathode and having the positive pole thereof-connected to the other end of said primary'winding; means to couple the secondary winding'to the.
  • said deflection coil and a diode element having a cathode connected to the end of thezprimarywinding remote from the said anode and having an anode connected to the end of the tertiary Winding remote from the anode end of the primary winding.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Details Of Television Scanning (AREA)
  • Coils Or Transformers For Communication (AREA)
US17246A 1947-04-21 1948-03-26 Circuit arrangement for generating a sawtooth-shaped current in a coil Expired - Lifetime US2476164A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL655174X 1947-04-21

Publications (1)

Publication Number Publication Date
US2476164A true US2476164A (en) 1949-07-12

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ID=19795204

Family Applications (1)

Application Number Title Priority Date Filing Date
US17246A Expired - Lifetime US2476164A (en) 1947-04-21 1948-03-26 Circuit arrangement for generating a sawtooth-shaped current in a coil

Country Status (5)

Country Link
US (1) US2476164A (ar)
DE (1) DE920265C (ar)
FR (1) FR964950A (ar)
GB (1) GB655174A (ar)
NL (1) NL131738C (ar)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963636C (de) * 1952-09-10 1957-05-09 Philips Nv Schaltungsanordnung zum Erzeugen eines saegezahnfoermigen Stromes in einer Spule
US2825849A (en) * 1954-06-29 1958-03-04 Rca Corp Cathode ray tube deflection and high voltage apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2265620A (en) * 1938-11-30 1941-12-09 Bahring Herbert Scanning current generator
US2438359A (en) * 1946-08-01 1948-03-23 Philco Corp Television receiver circuits and apparatus
US2440418A (en) * 1946-03-09 1948-04-27 Rca Corp Cathode-ray beam deflecting circuit
US2451641A (en) * 1945-09-28 1948-10-19 Rca Corp Power conservation system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE429863A (ar) * 1937-08-25
US2308908A (en) * 1939-09-07 1943-01-19 Bahring Herbert Saw-tooth oscillator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2265620A (en) * 1938-11-30 1941-12-09 Bahring Herbert Scanning current generator
US2451641A (en) * 1945-09-28 1948-10-19 Rca Corp Power conservation system
US2440418A (en) * 1946-03-09 1948-04-27 Rca Corp Cathode-ray beam deflecting circuit
US2438359A (en) * 1946-08-01 1948-03-23 Philco Corp Television receiver circuits and apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963636C (de) * 1952-09-10 1957-05-09 Philips Nv Schaltungsanordnung zum Erzeugen eines saegezahnfoermigen Stromes in einer Spule
US2825849A (en) * 1954-06-29 1958-03-04 Rca Corp Cathode ray tube deflection and high voltage apparatus

Also Published As

Publication number Publication date
FR964950A (ar) 1950-08-29
GB655174A (en) 1951-07-11
NL131738C (ar)
DE920265C (de) 1954-11-18

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