US2225300A - Saw-tooth wave generator - Google Patents

Saw-tooth wave generator Download PDF

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Publication number
US2225300A
US2225300A US212723A US21272338A US2225300A US 2225300 A US2225300 A US 2225300A US 212723 A US212723 A US 212723A US 21272338 A US21272338 A US 21272338A US 2225300 A US2225300 A US 2225300A
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United States
Prior art keywords
tube
coil
current
anode
voltage
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Expired - Lifetime
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US212723A
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English (en)
Inventor
Geiger Max
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Telefunken AG
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Telefunken AG
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Publication date
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Publication of US2225300A publication Critical patent/US2225300A/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

Definitions

  • the invention is concernedwith I circuit organizations wherein, witha viewto producing a-linear rise of current in a choke-coil, asource of potential supply is applied to the choke-coil and is disconnected. again therefrom after completion or termination of the rise of the current.
  • Circuit arrangements-which operatein accordance with this principle are known in the art of causing magnetic deflection by magnetic forces acting on the cathode-ray pencil in television tubes.
  • circuit schemes ofthis kind as heretofore known have the disadvantagethat the rise of the current proceeds in accordance with a straightlinelaw only initially, that is, in the early phase of the rise, and even then only under the condition that the potential is constant and. stable, and, further, that the inner resistance of the voltage source is negligibly low, and that the resistance of the switch break is also constant.
  • Fig. 1 shows one embodiment thereof
  • Fig. 2 shows a second embodiment thereof
  • Fig. 3' shows a modification of the arrangement of Fig. 2
  • FIGS. 4 and 5 show still further embodiments of my invention.
  • the exemplified embodiment shown in Fig. 1 comprises a screen-grid tube I 0, the deflector coil II of a cathode-ray tube, a rectifier I2, a resistance I3 and a source of plate potential supply I4. If the resistance I3 is assumed to be replaced by a source of D. C. voltage supply whose negative pole is united with the anode of the rectifier I2, then the circuit arrangement comprising the elements designatedby, III-J4 is known in the art.
  • An auxiliary coil I5;- a further tube I6 con-jointly with the resistance I3 accordingto the invention are arranged in the. known circuit organization to the end of causing a steady change of the voltage acting at the vcoil in such a way that the rise of the current will be caused to obey a straight-line law.
  • the anode ofthe tube It is connected directly to the anode of. the tube I2 and the cathode of tube I6 is grounded.
  • the differential quotient of the coil current will again possess the same size and conventionally in such a direction as to fiow from the positive terminal of the battery I4 to the anode of tube It.
  • a current must be initiated through the rectifier I2 by the opening of tube Ii since zero coil current could otherwise not be exceeded.
  • the circuit elements I3, I5 and I6 operate in such a way that during the linear rise of the current, at the auxiliary coil I5, there will arise a voltage of such polarity as to render the terminal thereof connected to tube It negative, and the terminal thereof joined to battery I4 positive, and this voltage acts as the regulator voltage for tube I6.
  • a positive grid potential (namely, the voltage between the left-hand end of the plate potential source of supply I4 and its tap) in series with a negative grid biasing voltage, the latter being furnished from the auxiliary coil I5 in a manner as hereinbefore described.
  • the size of the positive grid voltage must exceed that of the negative voltage so that, for a constant size of the negative grid voltage, a finite plate current is able to flow across the tube I6 by way of the resistance I3.
  • This plate current results in a fall of potential across resistance I3 whereby the terminal thereof connected to the anode of tube I2 is rendered negative and the terminal connected to battery I4 is positive and which at the same time represents the voltage acting at coil I I being constant in the known instance.
  • Fig, 2 difiers from that in Fig. 1 in as far as the auxiliary coil I5 is included in the control-grid circuit of a tube I'I provided in lieu of the rectifier I2; if desired, the said control-grid circuit in addition may be supplied with a negative biasing potential furnished from the RC mesh.
  • the resistance I3 Fig. 1 there is provided another RC mesh I9 as known in a circuit arrangement Fig. 2, though without the coil I5, the RC mesh I8 and with a rectifier instead of tube II.
  • the screen grid tube III has an inductance II connected serially with the anode thereof and a plate supply battery I4 has the positive terminal thereof connected to one terminal of the inductance I I, and the negative ter minal thereof connected to the cathode, the latter being grounded.
  • a second thermionic tube I! having anode, cathode and control electrodes, the cathode of the tube being connected to the common terminal of the anode of tube III and the inductance II through a time constant circuit I8.
  • a common terminal of the time constant circuit I8 is connected to the control grid of tube II through an inductance I5 which is positioned immediately adjacent the inductance II and is coupled therewith.
  • the anode of tube I1 is connected to the common terminal of inductance II and plate supply battery I4 through a time constant circuit I9.
  • the circuit scheme Fig. 2 operates in this manner that, in the presence of a steep rise of the current in the coil II the grid potential of tube I1 is reduced, which, in turn, means an increase in internal resistance, so that a greater portion of the practically constant potential existent at the RC mesh I9 drops at the tube II. But if the rise of the current in the coil I2 is too flat or slow, this results in a decrease of the voltage furnished from the auxiliary coil I5; hence, the grid potential of the tube I'I rises, its internal resistance diminishes, and at the coil II occurs an increase in the potential which, in turn, will cause the current in this coil to rise again With the desired slope.
  • Fig. 3 The showing of Fig. 3 is essentially the'same as that of Fig. 2 with the exception that the time constant circuit H) of Fig. 2 which is connected to the anode of tube I1 and the common terminal of inductance II and plate supply battery I4 has been omitted.
  • a tube IT in the sense of Figs. 2 and 3, and an RC mesh I9 in the sense of Fig. 2.
  • a tetrode as well as a resistance 22, the series arrangement of these two element being connected in parallel relation to the coil I I.
  • a screen grid tube II] has an inductance II connected directly to the anode of tube Ill and serially with plate supply battery I4, the negative terminal of which is connected to the cathode of tube III, the latter being grounded.
  • a screen grid tube 2I has the space discharge path thereof connected serially with a resistor 22 and this series circuit is connected substantially in parallel with inductance II, the anode of the tube being connected to the common terminal of inductance II and plate supply battery I4, and the terminal of resistor 22 remote from the cathode of tube 2I is connected to the common terminal of the anode of tube I0 and inductance II.
  • the control electrode of tube 2I is variably biased by plate supply battery I4, as is the screen electrode of the same tube.
  • control electrode having anode, cathode and one control electrode has the space discharge path thereof connected serially with a time constant circuit I9, the latter being connected directly to the anode of tube 2
  • the control electrode of tube I1 is connected to the common terminal of tube H and resistor 22.
  • Tube I 6 corresponds to the tube Fig. 1 bearing the identical reference numeral, and resistance [3' corresponds to the resistance with the identical reference numeral therein provided.
  • the grid circuit of tube It includes further a blocking condenser 25 and a resistance 26 which is united with a suitable biasing voltage.
  • a screen grid tube ID has the anode thereof serially connected'with an inductance H and a plate supply battery [4, the negative terminal of the latter being connectedto the cathode of the tube and the cathode being grounded.
  • a fourth tube l6 having anode, cathode and one control electrode, has the anode thereof connected to the common terminal of the anode "of diode l2 and the resistor l3 andhasthe cathode thereof grounded.
  • the control electrode of tube I 6 is connected through a condenser 25 to the common terminal of the anode of tube 23 and the resistor 24.
  • a resistor 26 Connected directly to the control electrode of tube I6 is a resistor 26,
  • theoinvention may be Lutilized in practice "also independently'of whether after completion. of the linear rise of current. the coil H undergoes a free half-cycle alone or in conjunction with a capacity connected in parallel with it or whether, say, bymeans of a counteracting voltage applied to the coil a still faster change of the current is obtained than that which would correspond to the natural period of the coil or to the resonant circuit formed by the coil and the paralleled condenser.
  • Saw-tooth wave generator means for storing electromagnetic energy, means for storing energy in said storage means, and means for applying a compensating voltage to said storage means, said. compensating means being adapted to generate a compensating voltage in accordance with the rate of change of current in the electromagnetic storage means.
  • An electric generator comprising means for storing electromagnetic energy, means for storing energy in said storage means, and means for applying a compensating voltage to said storage comprising means, said compensating means being adapted of the energy in said storage means, and means,
  • a saw-tooth wave generator comprising means for storing electromagnetic energy, means for storing energy in said storage means, a diode, a resistor connected in the anode-cathode circuit a circuit which is connected in parallelwith said energy storage means, a thermionic vacuum tube having anode, cathode, and at least one control electrode, means for connecting the anode.
  • a saw-tooth wave generator comprising electromagnetic energy storage means,means for storing energy in said storage means, a thermof said diode, said diode and said resistor forming ionic tube having anode, cathode and at least one control electrode, at least one time constant circuit connected in the anode-cathode circuit of said thermionic tube, said anode-cathode circuit and said time constant circuit comprising a series circuit which is connected substantially in parallel with said energy storage means, and means for impressing a portion of the energy of said electromagnetic storage means onto a control electrode of said thermionic tube.
  • a saw-tooth wave generator comprising electromagnetic energy storage means, a first thermionic vacuum tube having anode and cathode electrodes, a resistor connected in the anode-cathode circuit of said tube, said anodecathode circuit and said resistor comprising a series circuit which is connected substantially in parallel with said electromagnetic energy storage means, a diode, a second resistive member connected in the anode-cathode circuit of said diode, said anode-cathode circuit of said diode and said second resistance forming a series circuit which is connected substantially in parallel with said electromagnetic energy storage means, a second thermionic vacuum tube having anode, cathode and at least one control electrode, means for impressing the anode current of said second thermionic vacuum tube onto at least a portion of said second resistance, and means for impressing variations in the anode-current of said first vacuum tube onto the control electrode of said second thermionic vacuum tube.
  • the method of linearly storing and discharging electromagnetic energy which comprises the steps of storing electromagnetic energy and simultaneously developing a potential bearing a definite relationship to the rate of change of storing of said energy and correcting for irregularities in the linearity of the storing and discharging of energy in accordance with the value of the potential bearing the definite relationship to the rate of change of storing. said electromagnetic energy.

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US212723A 1937-02-20 1938-06-09 Saw-tooth wave generator Expired - Lifetime US2225300A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE511850X 1937-02-20

Publications (1)

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US2225300A true US2225300A (en) 1940-12-17

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US (1) US2225300A (en(2012))
BE (1) BE426430A (en(2012))
FR (1) FR833839A (en(2012))
GB (1) GB511850A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774911A (en) * 1954-02-08 1956-12-18 Int Standard Electric Corp Circuit arrangement for the generation of saw-tooth shaped deflecting currents

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774911A (en) * 1954-02-08 1956-12-18 Int Standard Electric Corp Circuit arrangement for the generation of saw-tooth shaped deflecting currents

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Publication number Publication date
BE426430A (en(2012))
GB511850A (en) 1939-08-25
FR833839A (fr) 1938-11-02

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