US2215177A - Saw-tooth current circuit - Google Patents

Saw-tooth current circuit Download PDF

Info

Publication number
US2215177A
US2215177A US216669A US21666938A US2215177A US 2215177 A US2215177 A US 2215177A US 216669 A US216669 A US 216669A US 21666938 A US21666938 A US 21666938A US 2215177 A US2215177 A US 2215177A
Authority
US
United States
Prior art keywords
current
saw
winding
diode
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US216669A
Other languages
English (en)
Inventor
Hepp Gerard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2215177A publication Critical patent/US2215177A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • This invention relates to a circuit arrangement for supplying a saw-tooth current to a load-impedance, more particularly to the deflecting coils of a cathode ray tube that may be used in a television transmitter orreceiver.
  • a circuit arrangement for supplying a saw-tooth current to a load-impedance more particularly to the deflecting coils of a cathode ray tube that may be used in a television transmitter orreceiver.
  • the saw tooth current to the deflecting coils through a step-down transformer.
  • connection of the oathode of the diode to the high tension end of the primary transformer winding is a great drawback to this arrangement, since due to this an inadmissible high direct voltage is set up between the cathode of the diode andearth, in other words the filament.
  • the present invention has for its purpose to improve an arrangement of this kind in such a manner that this drawback is avoided.
  • the transformer is equipped for this purpose with an additional winding with which the series-connection of a diode and a source of direct voltage is connected in parallel.
  • the cathode of the diode may now be connected to earth, if desired.
  • Another advantage of the arrangement according to the invention is that the tubular diode can be built in one of the other tubes of the arrangement.
  • the circuit arrangement represented in Figure 1 comprises a device I for producing a saw-tooth current which is supplied through a step-down transformer 2 to the deflecting coils 3 of a cathode ray tube 4.
  • the transformer 2 comprises a 55 primary winding 5, a secondary winding 6 and an additional winding 1.
  • the series-connection of a diode 8 and a source of direct voltage 9 In parallel with the additional winding 1 is provided the series-connection of a diode 8 and a source of direct voltage 9, the negative terminal of this supply being connected to the anode of the diode 8.
  • the cathode of the diode 8 is connected to earth.
  • the diode is so connected that during that part of the period, in which the course of the current through the deflecting coils must be linear, a positive Voltage is supplied to the anode of the diode by the voltage set up across the winding 1. Consequently the voltage at the anode of the diode 8 during the above-mentioned part of the period is determined by the difference between the voltage across the winding 1 and the voltage of the source of direct Voltage 9. The latter is so chosen that no current flows through the diode 8 when the voltage across the winding 1 has the desired constant value. If, however, the voltage across the winding 1 exceeds the desired value by some reason or other the diode 8 becomes conductive, whereby a further voltage increase across the winding 1 is rendered impossible. During the said period there will consequently be set up a constant voltage across the winding 1, due to which the voltage across the secondary winding is also constant and a purely saw-tooth current flows through the coils 3.
  • Figure 2 shows a form of construction in which the winding 1 is connected in series with the secondary winding 6. Furthermore the series-connection of the diode 8 and a source of direct voltage is connected in parallel with the series-connection of the secondary winding 6 and the winding 1.
  • the voltage supply is constituted by the parallel-connection of a resistance I0 and a condenser II across which resistance the current traversing the diode 8 causes a direct voltage whose direction is opposite to that of the voltage set up across the winding 1 during the period part referred to.
  • the operation of this arrangement exactly corresponds to that shown in Figure 1.
  • a system for producing oscillations of sawtooth wave form comprising means for generating a current variation of saw-tooth wave form, means for applying the generated wave form to the primary winding of a transformer at a potential greater than a predetermined minimum, a pair of secondary windings, means for connecting a load impedance to one of said secondary windings, and means for connecting a rectifier and a source of potential in series and to the other of said secondary windings, the source of potential being connected to oppose the flow of current through said rectifier whereby the rate of change in the saw-tooth wave form will remain constant.
  • a system for producing oscillations of sawtooth wave form comprising means for generating a current variation of saw-tooth wave form, a transformer having a primary anda pair of secondary windings, means for applying the generated wave form to the primary Winding of said transformer at a potential greater than a predetermined minimum, means for connecting a load impedance to one of the secondary windings, and a unidirectional current path and a source of current connected in series and connected to the other secondary winding, said source of current being connected to oppose the flow of current through the unidirectional current path whereby linearity in the rate of change of the current wave will be assured.
  • a system for producing oscillations of sawtooth wave form comprising means for generating a current variation of saw-tooth Wave form, a transformer having a primary and a secondary Winding, means for applying the generated Wave form to the primary of said transformer at a potential greater than a predetermined minimum, an asymmetric unit and a source of potential connected in series and connected to the secondary winding of said transformer, and a load impedance connected across at least a portion of said secondary, the source of'potential being connected to oppose the flow of current through the asymmetric unit whereby a true saw-tooth wave form of constant rate of current change will be produced.
  • a system for producing oscillations of 'sawtooth wave form comprising means for generating current variations of substantially saw-tooth wave form, a transformer having mutually inductive primary and secondary means, means for applying the generated wave form to the primary inductive means at a potential greater than a predetermined minimum, means for connecting a load impedance across a portion of the secondary inductive means, and a uni-directional current path and a source of potential connected in series and connected across at least a portion of the secondary inductive means, said source of potential being connected to oppose the flow of current through the unidirectional current path whereby linearity in the rate of change of the current Wave will be assured.

Landscapes

  • Details Of Television Scanning (AREA)
US216669A 1937-08-25 1938-06-30 Saw-tooth current circuit Expired - Lifetime US2215177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2215177X 1937-08-25

Publications (1)

Publication Number Publication Date
US2215177A true US2215177A (en) 1940-09-17

Family

ID=19873888

Family Applications (1)

Application Number Title Priority Date Filing Date
US216669A Expired - Lifetime US2215177A (en) 1937-08-25 1938-06-30 Saw-tooth current circuit

Country Status (3)

Country Link
US (1) US2215177A (US06342305-20020129-C00040.png)
BE (1) BE429863A (US06342305-20020129-C00040.png)
FR (1) FR842492A (US06342305-20020129-C00040.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512305A (en) * 1945-12-15 1950-06-20 Philco Corp Electrical system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL131738C (US06342305-20020129-C00040.png) * 1947-04-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512305A (en) * 1945-12-15 1950-06-20 Philco Corp Electrical system

Also Published As

Publication number Publication date
FR842492A (fr) 1939-06-13
BE429863A (US06342305-20020129-C00040.png)

Similar Documents

Publication Publication Date Title
US2074495A (en) Circuits for cathode-ray tubes
US2212217A (en) Oscillatory electric circuits
US2212202A (en) Electronic oscillation generator
US2303924A (en) Television transmitting or receiving system
US2308908A (en) Saw-tooth oscillator
US2139432A (en) Oscillation producing system
US2397150A (en) Television apparatus
US2832003A (en) Compensated sweep circuit
US2588659A (en) High-voltage supply
US2523108A (en) Deflection of electron beams
US2244003A (en) Sawtooth oscillator
US2320551A (en) Relaxation oscillator
US2137262A (en) Television system
US2637832A (en) Centering circuit for cathode-ray tubes
US2215177A (en) Saw-tooth current circuit
US2588652A (en) High-voltage supply
US3146373A (en) Circuit arrangement for dynamic postfocusing in electrostatic focusing cathode-ray tubes
US2555832A (en) Cathode ray deflection system
US2473983A (en) Deflection circuit
US2250686A (en) Saw-tooth wave oscillator
US2798155A (en) Circuit arrangement for producing a variable high direct voltage
US2055611A (en) Saw-tooth wave form current and voltage generating device
US2460601A (en) Cathode-ray tube deflecting system
US2459187A (en) Deflection circuit for cathode-ray tubes
US2404624A (en) Voltage regulator for electron discharge devices