US3403295A - Voltage-multiplying, alternating-pulse circuits, notably for the ignition system of internal combustion engines - Google Patents

Voltage-multiplying, alternating-pulse circuits, notably for the ignition system of internal combustion engines Download PDF

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Publication number
US3403295A
US3403295A US574329A US57432966A US3403295A US 3403295 A US3403295 A US 3403295A US 574329 A US574329 A US 574329A US 57432966 A US57432966 A US 57432966A US 3403295 A US3403295 A US 3403295A
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United States
Prior art keywords
voltage
alternating
capacitor
internal combustion
thyratrons
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Expired - Lifetime
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US574329A
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English (en)
Inventor
Castelet Gaetan De Coye De
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Renault SA
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Renault SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0807—Closing the discharge circuit of the storage capacitor with electronic switching means
    • F02P3/0838—Closing the discharge circuit of the storage capacitor with electronic switching means with semiconductor devices

Definitions

  • An alternating-current generator having a pair of thyratrons connected in series across a direct current source.
  • a monitoring-pulse generator is connected to the control members of the thyratrons to alternatively render them conductive.
  • a capacitor and the primary of a transformer are series connected between a point common to the thyratrons and to a terminal of the current source to develop and deliver the alternating current produced.
  • This invention relates to a device capable of generating relatively powerful alternating-current pulses across the terminals of a coil from .a direct-current source, a pair of electron relays of the threshold and snap-switching type, such as solid or gas thyratrons, at least one capacitor and a monitoring-pulse generator for controlling said relays.
  • a pair of threshold snap-switching electron relays are connected in series across the terminals of said directcurrent source of the alternating pulse generator according to this invention, said relays being rendered conducting alternately, by means of their relevant control members connected to the monitoring-pulse emitter.
  • a capacitor and the primary winding of a transformer having its secondary winding adapted to deliver said alternating pulses.
  • the device according to this invention is capable of charging said capacitor .at a voltage several times higher than that of the supply source. Under low-charge conditions of said coil it was observed that the voltage increase across the terminals of said capacitor was five to seven times the supply voltage.
  • thyratrons more particularly two solid thyratrons of the silicon type frequently referred to as thyristors
  • this device was capable of generating series of alternating pulses across the terminals of the aforesaid secondary winding without causing any one of said thyratrons to remain energized between successive pulse series, thus affording substantial savings in current, the thyratrons used being adapted to be blocked or unblocked by the control gate.
  • a circuit of this character is particularly useful for the ignition systems of the controlled-ignition type for internal combustion engines, when it is desired to produce several sparks per plug at each ignition.
  • a spark may be produced every 20 microseconds during 200 microseconds, it being understood that these figures are given by way of illustration, not in a limiting sense.
  • FIGURE 1 is a wiring diagram of the circuit according to this invention.
  • FIGURE 2 is an electrically equivalent circuit diagram 3,403,295. Patented Sept. 24, 1968 permitting an easier understanding of the voltage-multiplying process;
  • FIGURE 3 is an oscillogram showing a control signal fed to the control elements, notably in the case of an ignition system of internal combustion engine, and
  • FIGURE 4 shows under the same conditions the oscillogram of the voltage obtaining across the coil terminals.
  • a direct-current source 1 has its positive and negative output terminals 2 and 3 connected through a limiting resistance 4 to a capacitor 5.
  • a capacitor 5 In the path extending from the positive plate 6 of capacitor 5 to the negative plate 7 thereof are inserted in series a pair of solid silicon thyratrons 8 and 9, the anode of thyratron 8 being connected to the aforesaid plate 6, and the cathode of thyratron 9 being connected to the negative plate 7.
  • Both thyratrons 8 and 9 are of the inverted type, i.e., the gate control 10 of thyratron 8 acts upon the cathode whereas the gate control of thyratron 9 acts upon the anode.
  • the common circuit point 14 is connected to the plate 17 of a capacitor 16 having its other plate 18 connected through a return line to the negative line 3 and to the armature 7 through the primary winding 19 of a highvoltage transformer feeding through its secondary 20 the load (not shown) utilizing said alternating pulses.
  • This secondary winding 20 may thus be connected to the spark plugs of an internal combustion engine through a conventional distributor (not shown).
  • the capacity of capacitor 16 is but one fraction of that of capacitor 5.
  • each thyratron can be blocked by reversing the voltage produced by the primary winding 19, provided that the control signals have an adequate amplitude and interval between pulses.
  • control signals will appear in the form of trains of waves having a total duration t1, the relative time spacing of the signals being 22.
  • the voltage delivered by the secondary winding 20 and shown in FIGURE 4 will have the rate of the control signals.
  • trains of sparks having the desired duration can be produced with this device by using two conventional-type thyratrons.
  • the alternating control pulses are easily obtained as rectangular signal derivatives. If the source has a low impedance and permits a fast charging of capacitor 16, the storage capacitor 5 and resistance 4 may be dispensed with.
  • An alternating-pulse generator comprising a direct current source, a pair of semiconducting thyratrons of opposite polarities serially connected across said source and each having a control member, one said control member being connected to the anode of one thyratron and the other control member being connected to the cathode of the other thyratron, a monitoring-pulse generator having two outputs, said control members being connected to each other and to one of said output terminals with the other output terminal being connected to a common point between said thyratrons, a capacitor connected to said common point, and a transformer the primary winding of which is serially connected between said-capacitor and one terminal of said source and the secondary winding of which is adapted to deliver said alternating pulses.
  • an alternatingpulse generator in a means for feeding alternating pulses to spark plugs of an internal combustion engine, an alternatingpulse generator according to claim 1 wherein said secondary winding delivers said alternating pulses to said spark plugs.
  • a generator according to claim 2 wherein said monitoring-pulse generator as adapted to trigger said thyratrons in such a manner that a series of alternating pulses having a total duration ranging from 20 microseconds to 200 microseconds per ignition is obtained for each ignition.
  • monitoring-pulse generator comprises a base timer delivering alternating impulses and a gate circuit limiting the duration of the rate of ignition pulses to a determined duration.
  • An alternating-pulse generator according to claim 1 further comprising a storage capacitor connected across and charged by said source.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Synchronous Machinery (AREA)
US574329A 1965-09-06 1966-08-23 Voltage-multiplying, alternating-pulse circuits, notably for the ignition system of internal combustion engines Expired - Lifetime US3403295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR30550A FR1492019A (fr) 1965-09-06 1965-09-06 Circuit à impulsions alternées multiplicateur de tension, notamment pour l'allumage des moteurs à combustion interne

Publications (1)

Publication Number Publication Date
US3403295A true US3403295A (en) 1968-09-24

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Family Applications (1)

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US574329A Expired - Lifetime US3403295A (en) 1965-09-06 1966-08-23 Voltage-multiplying, alternating-pulse circuits, notably for the ignition system of internal combustion engines

Country Status (6)

Country Link
US (1) US3403295A (es)
DE (1) DE1288129B (es)
ES (1) ES330906A1 (es)
FR (1) FR1492019A (es)
GB (1) GB1160901A (es)
OA (1) OA02255A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509443A (en) * 1968-11-27 1970-04-28 Gen Electric Pulse circuit for supplying two closely spaced electric pulses
US3656046A (en) * 1970-06-18 1972-04-11 Galbraith Pilot Marine Corp Power conversion system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175900A (en) * 1939-10-10 knight
US3163782A (en) * 1963-07-25 1964-12-29 Ling Temco Vought Inc Multiple delay line solid state pulse modulator
US3211964A (en) * 1963-04-05 1965-10-12 Ampex Actuator power supply
US3257566A (en) * 1961-08-21 1966-06-21 Hoffman Electronics Corp Complementary controlled rectifier switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175900A (en) * 1939-10-10 knight
US3257566A (en) * 1961-08-21 1966-06-21 Hoffman Electronics Corp Complementary controlled rectifier switch
US3211964A (en) * 1963-04-05 1965-10-12 Ampex Actuator power supply
US3163782A (en) * 1963-07-25 1964-12-29 Ling Temco Vought Inc Multiple delay line solid state pulse modulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509443A (en) * 1968-11-27 1970-04-28 Gen Electric Pulse circuit for supplying two closely spaced electric pulses
US3656046A (en) * 1970-06-18 1972-04-11 Galbraith Pilot Marine Corp Power conversion system

Also Published As

Publication number Publication date
ES330906A1 (es) 1967-09-16
FR1492019A (fr) 1967-08-18
GB1160901A (en) 1969-08-06
DE1288129B (de) 1969-01-30
OA02255A (fr) 1970-05-05

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