US3918425A - Electronic device serving to supply a load with constant voltage pulses - Google Patents

Electronic device serving to supply a load with constant voltage pulses Download PDF

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Publication number
US3918425A
US3918425A US400143A US40014373A US3918425A US 3918425 A US3918425 A US 3918425A US 400143 A US400143 A US 400143A US 40014373 A US40014373 A US 40014373A US 3918425 A US3918425 A US 3918425A
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Prior art keywords
capacitor
thyristor
oscillator
voltage
conditioning
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US400143A
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English (en)
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Jean-Bernard Pulzer
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SETCO LA CHAUX DE FONDS SA
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SETCO LA CHAUX DE FONDS 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
    • F02P3/0876—Layout of circuits the storage capacitor being charged by means of an energy converter (DC-DC converter) or of an intermediate storage inductance
    • F02P3/0884—Closing the discharge circuit of the storage capacitor with semiconductor devices

Definitions

  • the present invention relates to an electronic device for supplying a load with constant voltage pulses, comprising an oscillator, the oscillations of which are used to charge a capacitor which is then discharged across the load by means of an on/off device.
  • Devices of this type which utilize the voltage of the capacitor, or part of it, to actuate a circuit which blocks the oscillator.
  • the on/off devices used therein is generally a thyristor. These systems have the drawback of causing a slow discharge of the capacitor, and hence they require a periodical re-starting of the oscillator even if the thyristor has not been ignited. Furthermore, it may happen that, at extreme temperatures, the thyristor has a too long a conduction time, which keeps the oscillator from operating normally.
  • a further object of the invention is the use of this device to suitably feed the primary of an ignition coil of an explosion engine.
  • the device according to the invention is characterized in that the charge of an auxiliary capacitor controls the blocking of the oscillator, which is then restarted by the closing of an electronic switch which causes the discharge of the said auxiliary capacitor in order to ignite the thyristor, this thyristor being preferably equipped with an inductive element in order to facilitate extinguishing it.
  • I r I When used to supply an ignition coil of an explosion engine, these devices are connectedto a control member actuated by the engine, to the said primary of an ignition coil, and to the battery. When the supply cables are too long, or if the attachment of the device does not provide very good contact with the ground of the vehicle, interference pulses may be picked up by the cable connected to the control member. These pulses are due to the operation of the oscillator, which absorbs sizable current peaks.
  • the use of a mechanical circuit breaker for controlling the device requires a circuit provided with an appropriate filter in order to suppress the rebound effects.
  • the device according to the invention is also characterized in that the closing of the electronic switch is brought about via a control, circuit which is blocked during the operation of the oscillator and operated by a member actuated by the engine.
  • This embodiment is intended tobe placed on an engine designed for aconventional ignition assembly, i.e., having an ignition coil 4 and a circuit breaker 3.
  • This circuit breaker comprises a fixed contact 3a and a movable contact 3b actuated by the rotation of the engine which causes the successive opening and closing of the contacts.
  • the ignition coil 4 comprises a high-voltage secondary 4b connected to a spark gap 5 (spark plugs) and a primary 4a through which, in the conventional ignition, there runs a current hatched by the circuit breaker 3.
  • the primary 4a connected between the terminals C and D, is intended to carry the pulses generated by a device 7 which induce in the secondary 4b voltages sufficient to produce sparks at the spark plugs.
  • These pulses are produced in the device 7 by the discharge of a capacitor C1 by means of a thyristor T7, and they are applied to the primary 4a of the ignition coil across an inductive element 8.
  • This element consisting of a coil L in parallel with a resistor R8, is intended to facilitate extinguishing the thyristor T7.
  • the circuit which produces the activation of the thyristor T7 will be described in detail below.
  • the charging of the capacitor C1 is achieved via an oscillator circuit.
  • the device 7 comprises besides various other circuit components, a transformer 6 with a primary 6a, and two secondaries 6b and 60, respectively.
  • the secondary 6c of the transformer 6 is connected to the ground, on the one hand, and to the one electrode of this capacitor C1 by a diode D1 on the other hand.
  • the other electrode end of this capacitor C1 is connected to an output terminal C, which is connected in turn to the ground by a diode D2 in parallel with the primary 4a of the ignition coil.
  • the device is powered by a battery 1 connected to a positive power supply terminal A via a main supply contact 2.
  • the voltage of this battery is applied to the primary 6a of the oscillator transformer through a transistor T2.
  • the base of the transistor T2 is connected to the emitter of a transistor T1, the collector of which is connected to an intermediate tap of the primary 6a, and the base of which is connected to one end of the secondary 6b for being supplied a feedback (reaction) voltage.
  • the other end of the secondary winding 6b is connected to the ground, on the one hand, by a resistor R14, and to a point E, on the other hand, across the resistor R15 which supplies a bias voltage to the base of the transistor T1 for the starting of the oscillator.
  • a positive voltage is periodically obtained at the base of this transistor T1, which voltage causes the transistors T1 and T2 to conduct.
  • this base would carry a negative voltage, proportionate to the voltage of the secondary 60 used to charge the capacitor C1.
  • the use of a diode D4 connected between the ground and the base of the transistor T1 prevents this negative voltage from appearing with a large value, thus protecting the base of this transistor, and also making it possible to recuperate this voltage at the other end of the winding 6b, in order to charge, across a diode D3, an auxiliary capacitor C2 intended to monitor the blocking of the oscillator.
  • the blocking of the oscillator is effected by a transistor T3, the collector of which is connected to the base of the transistor T1, and the emitter to the ground.
  • the base of this transistor T3, having a resistor R11 connected to the ground, is connected to the positive power supply terminal A by a thyristor T5 across a resistor R13.
  • the thyristor T5 is switched on when a capacitor C2 becomes charged (in a manner which will be described further on) and causes the transistor T3 to conduct.
  • the gate of the thyristor T5 also connected to the base of the transistor T3 via a resistor R12, is connected to the capacitor C2 by a Zener diode Z1.
  • a control pulse at the gate of a thyristor T6 causes the discharge of the capacitor C2 across a resistor R9, the thyristor T6, the gate of the thyristor T7 in parallel with the resistor R7, and the inductive element 8.
  • This discharge controls the ignition of the main thyristor T7, on the one hand, and the extinguishing of the thyristor T5, on the other hand, by applying to the anode of the latter a negative pulse via a capacitor C3 connected between the anodes of the thyristors T and T6.
  • the elements connected to the capacitor C2 may exhibit small leakage currents which might discharge the capacitor and hence prevent re-starting of device 7 after a long interruption of the oscillator.
  • the capacitor C2 is connected to the positive terminal A by a high-value resistor R which thus makes it possible to compensate for the possible leakage currents.
  • the control pulse of the thyristor T6, applied by a diode D7 to the gate of the thyristor T6, which comprises a resistor R6 between its gate and its cathode, is obtained when the contacts of the circuit breaker 3 open by the charging of a capacitor C4 across a diode D6 and the resistors R1, R2, R4 and R5 connected in series with the capacitor.
  • the closing of the contacts of the circuit breaker 3 enables the capacitor C4 to discharge across the resistors R3, R5, and R4.
  • the time constant of this circuit is determined in such a way that the rebounds of the contacts 3a and 3b cannot cause spurious operations.
  • the pulses supplied by this control circuit for the ignition of the thyristor T6 are short-circuited by a transistor T8 during the operation of the oscillator.
  • the collector of the transistor T8 is connected to the junction between the resistor R4 and the anode of the diode D7, the emitter of this transistor T8 being grounded.
  • the base of this transistor T8, connected to the ground via a resistor R16, is also connected by a resistor R17 to a point E.
  • the positive supply voltage is applied to the point E across a resistor R13 and a diode D5 connected between the anode of the thyristor T5 or the point E.
  • the voltage on point E is stabilized by a Zener diode Z2 connected between the point E and the ground, and it supplies the energizing voltage for the transistor T8, as well as the bias voltage, necessary for the starting of the oscillator, to the transistor T1.
  • the two capacitors C1 and C2 charge and discharge in unison.
  • the capacitor C2 assumed to have been previously charged, discharges across the resistor R9, the thyristor T6, the resistor R7, and the parallel network of the resistor R8 and the inductance L.
  • the voltage drop in the resistor R7 creates a potential difference between the cathode and the gate of the thyristor T7, which becomes conductive,
  • the capacitor C1 thus discharges across the thyristor T7, the parallel network RS/L, and the primary winding 4a of the ignition coil 4, no current then passing through the diode D2, which is biased at that moment in the blocking direction.
  • the capacitor C1 soon recharges in the direct polarity; in any event, the slight reverse voltage which it takes on to extinguish the thyristor T7 is negligible compared with the voltage at which it charges in the direct polarity. Even before the capacitor C1 has finished discharging, or just at the moment when it finishes discharging at the latest, the capacitor C2 has likewise completely discharged across the aforementioned circuit.
  • the situation which will prevail in the device may be established on the basis of the diagram of the device. Because the capacitor C2 is discharged, the Zener diode Z1 will not allow any current topass. Thus there will be no voltage at the gate of the thyristor T5, which will remain in the non-conducting state in which it has been placed by the negative pulse at its anode.
  • the non-conductive state of the thyristor T5 will allow the positive voltage to pass through the resistor R13 to the point E, where this positive voltage will be stabilized by the Zener diode 22.
  • the voltage divider R15, R14 will therefore supply a bias voltage to the secondary winding 6b of the transformer 6, and thereby to the base of the transistor T1.
  • this bias voltage will tend to start charging the capacitor C2 via the diode D3.
  • the voltage at the base of the transistor T1, originally just equal to the threshold voltage of the diode D3, will soon become sufficient for a current to pass through the base-emitter junctions of the two transistors T1 and T2.
  • connection of the collector of the transistor T1 does not appreciably alter the Darlington configuration which is, in fact, formed by the transistors T1 and T2.
  • This connection of the collector of the transistor T1 to an intermediate tapping point is simply intended to compensate for the voltage drop equal to twice the threshold voltage for the current passing through the transistor T1, this improving the operation of the two transistors. It would be quite possible, however, to have only one high-gain transistor in place of the transistors T1 and T2.
  • the secondary windings 6b and 6c are subject to a sequence of alternately positive and negative half-periods.
  • the voltage is positive at the base of the transistor T1
  • the voltage is negative at the anode of the diode D1
  • no current passes through the latter.
  • a current will pass through the diode D1 and thus come to charge the capacitor C1 across the diode D2 in parallel with the primary winding 4a of the ignition coil.
  • the voltage at the terminals of the capacitor C2 will therefore be an exact counterpart of the voltage at the terminals of the capacitor C1 but and this is particularly important without there being any charge derivation drained from the capacitor C1.
  • This effect of complete galvanic separation between the capacitor supplying the output discharge (C1) and the capacitor enabling the charge to be checked (C2) constitutes an important and hitherto unknown advantage of the device described here.
  • the capacitor C2 the counterpart of the capacitor C1 gradually charges, so that the voltage at the terminals of the Zener diode Z1 finally exceeds the Zener voltage thereof, and a current begins to pass through this Zener diode.
  • This current creates a voltage drop in the resistor R12, causing the thyristor T5 to go into the conductive state.
  • the transistor T3, which receives a positive potential at its base becomes conductive and short-circuits the transistors T1 and T2; so that the oscillation stops, while the capacitor C1, free of any derivation, retains the charging voltage it has reached at that moment.
  • the conduction of the thyristor T5 causes the voltage at the point E to drop and substantially nullifies the voltage at the anode of the diode D3, as well as the voltage at the base of the transistor T8.
  • the transistor T8 was made conductive by the positive voltage at the point E, so that the anode of the diode D7 was substantially kept at low impedance with respect to the ground potential.
  • the transistor T8 is no longer conductive, and a positive pulse, due to the breaking of the contact 3a, 3b and applied via the diode D6 and the capacitor C4, can pass through the diode D7 to switch on the thyristor T6.
  • the maximum ignition-pulse repetition frequency for an explosion engine practically never exceeds 400 to 500 pulses per second.
  • the oscillating frequency. reached kc/s, which means that in the most unfavorable case (eg, an 8-cylinder engine running at extremely high speed), there are still more than 10 half-periods available to charge the capacitors.
  • the ignition sparks remain constant, not only despite possible fluctuations of the supply voltage (battery voltage), but also as a function of the more or less rapid pulse sequence required, and this up to the highest values which occur in practice for automobile engines.
  • the device according to the present invention makes possible a significant improvement in the efficiency of explosion engines under their various operating conditions.
  • An electronic device including means for supplying a load with constant voltage pulses, said device comprising:
  • an oscillator connected to said power supply terminals, comprising at least one active electronic element and a transformer having a plurality of windings forming at least one primary winding in cooperative relationship with said active element and at least one secondary winding electrically separated from said active electronic element,
  • switching conditioning means for switching said oscillator selectively into inoperative and operative conditions
  • first rectifier means connecting said first capacitor to said secondary winding of said transformer for charging said first capacitor during said operative condition of said oscillator
  • control input receiving means settable in relation to external control means and to receive command signals therefrom for controlling occurrences of said constant voltage pulses
  • main controlled electronic means comprising an on/ off device in series with said first capacitor in a discharge circuit thereof, connected for operating under control of said control input receiving means, and for causing said first capacitor to discharge through said discharge circuit across said output terminal means upon receiving one of said command signals,
  • auxiliary controlled electronic means connected for operating under control of said control input receiving means and causing said second capacitor to discharge upon receiving one of said command signals
  • said switching conditioning means being responsive to said voltage level detecting means for switching said oscillator to said inoperative condition, and being responsive to one of said main and auxiliary controlled electronic means for switching said oscillator to said operative condition.
  • said control input receiving means comprises an inhibiting circuit connected for operating under con trol of said switching conditioning means for preventing said command signals, as well as any spurious signal which might be received by said control input receiving means, from causing said main and said auxiliary controlled electronic means to operate for causing said first and second capacitors to discharge.
  • a device wherein said main controlled electronic means comprises a first thyristor as said on/off device.
  • said switching conditioning means comprises:
  • a conditioning thyristor connected to be conducting for setting said oscillator in the inoperative condition and to be non-conducting for setting said oscillator in the operative condition
  • an oscillator inhibiting transistor connected to be switched on by a current flowing through said conditioning thyristor in the on state thereof, said oscillator inhibiting transistor establishing, in the switched-on state, a short circuit over said active electronic element of said oscillator.
  • said first rectifier means comprises a diode connected between said first capacitor and said secondary winding separate from said active electronic element
  • said second rectifier means comprises a diode connected between said second capacitor and a winding of said transformer connected to said active element, and
  • said voltage level detecting means comprises a Zener diode connected between said second capacitor and the gate of said conditioning thyristor for causing it to switch on when said second capacitor becomes charged at a voltage equal to the Zener voltage of said Zener diode.
  • said auxiliary controlled electronic means comprises an auxiliary thyristor, having its gate connected to said control input receiving means for causing said auxiliary thyristor to conduct upon receiving one of said command signals, and having its anode-cathode path connected in a circuit with said second capacitor, which circuit includes a resistor connected between the gate and cathode of said first thyristor for causing the current passing 9 through said auxiliary thyristor upon receiving one of said command signals to switch on said first thyristor, and thus causing said first capacitor to discharge through said discharge circuit across said output terminal means.
  • said discharge circuit of said first capacitor includes an impedance member for ensuring said first thyristor is extinguished just after discharge of said first capacitor.
  • said switching conditioning means comprises a conditioning control capacitor interconnecting the anodes of said conditioning thyristor and said auxiliary thyristor for causing the switching-on of said auxiliary thyristor to extinguish said conditioning thyristor and thereby switching said switching conditioning means into a state which resets said oscillator into said operative condition.
  • control input receiving means comprises,
  • an input transmitting branch comprising a capacitor and a resistor in series, said input transmitting branch having one end connected to the point where said input diode and said input resistor are connected, and another end connected in relation with at least one of said main and auxiliary controlled electronic means,

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  • 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)
US400143A 1972-09-25 1973-09-24 Electronic device serving to supply a load with constant voltage pulses Expired - Lifetime US3918425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1407072A CH571791A5 (fi) 1972-09-25 1972-09-25

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US3918425A true US3918425A (en) 1975-11-11

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Country Status (7)

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US (1) US3918425A (fi)
CH (1) CH571791A5 (fi)
DE (1) DE2347930A1 (fi)
FR (1) FR2200696B1 (fi)
GB (1) GB1426009A (fi)
IT (1) IT993415B (fi)
NL (1) NL7313190A (fi)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154205A (en) * 1976-08-18 1979-05-15 Semikron, Gesellschaft Fur Gleichrichterbau Capacitor ignition system for internal-combustion engines
US5561350A (en) * 1988-11-15 1996-10-01 Unison Industries Ignition System for a turbine engine
US5754011A (en) * 1995-07-14 1998-05-19 Unison Industries Limited Partnership Method and apparatus for controllably generating sparks in an ignition system or the like
US6670777B1 (en) 2002-06-28 2003-12-30 Woodward Governor Company Ignition system and method
US20050276000A1 (en) * 2004-06-15 2005-12-15 Wilmot Theodore S Solid state turbine engine ignition exciter having elevated temperature operational capabiltiy

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263124A (en) * 1963-08-14 1966-07-26 Stuermer Karl Solid state capacitor discharge ignition system
US3302629A (en) * 1964-09-21 1967-02-07 Motorola Inc Capacitor discharge ignition system with blocking oscillator charging circuit
US3310723A (en) * 1963-10-18 1967-03-21 Honeywell Inc High voltage power supply for photographic flash apparatus
US3334619A (en) * 1964-10-07 1967-08-08 Texas Instruments Inc Capacitive discharge ignition system and blocking oscillator power supply
US3418988A (en) * 1966-07-27 1968-12-31 Gen Motors Corp Ignition system for internal combustion engines
US3487822A (en) * 1967-11-29 1970-01-06 Motorola Inc Capacitor discharge ignition system
US3496921A (en) * 1968-08-01 1970-02-24 Ford Motor Co Capacitive storage ignition system
US3546528A (en) * 1968-01-24 1970-12-08 Rca Corp Capacitor discharge ignition circuit
US3560833A (en) * 1968-11-30 1971-02-02 Nippon Denso Co Ignition device with low source voltage compensating circuit
US3583378A (en) * 1969-04-08 1971-06-08 Warren K Pattee Capacitive discharge solid state ignition system
US3605714A (en) * 1969-06-11 1971-09-20 Eltra Corp Contactless ignition system
US3618580A (en) * 1969-12-17 1971-11-09 Motorola Inc Overvoltage and electronic relay circuit for capacitor discharge ignition systems
US3639826A (en) * 1970-03-12 1972-02-01 Kenneth Grundberg Electronic control circuit
US3677253A (en) * 1970-01-13 1972-07-18 Nippon Denso Co Capacitor discharge type ignition system for internal combustion engines
US3687123A (en) * 1965-10-04 1972-08-29 Floyd M Minks Controlled electrical pulse source
US3692009A (en) * 1969-10-18 1972-09-19 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3721224A (en) * 1970-03-13 1973-03-20 Ates Componenti Elettron Ignition circuit for spark plugs of internal-combustion engine
US3722489A (en) * 1969-03-13 1973-03-27 Howard Ass Inc Electronic relay and ignition system utilizing same
US3740589A (en) * 1971-02-16 1973-06-19 F Minks Blocking oscillator with current mode transformer

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
FR1472345A (fr) * 1966-03-10 1967-03-10 Lucas Industries Ltd Dispositif d'allumage perfectionné pour moteur à combustion interne
DE1539202A1 (de) * 1967-02-15 1970-02-19 Funk Und Antennentechnik Gmbh Thyristor-Zuendanlage
CH478341A (de) * 1967-06-30 1969-09-15 Diener Rudolf Zündvorrichtung für Verbrennungsmotoren
DE2063883A1 (de) * 1970-12-24 1972-07-06 Bbc Brown Boveri & Cie Anordnung bei einer elektronischen Hochleistungskondensator-Zündanlage
IT939030B (it) * 1971-09-25 1973-02-10 Ates Componenti Elettron Sistema di accensione a semicon duttori per motori a scoppio

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263124A (en) * 1963-08-14 1966-07-26 Stuermer Karl Solid state capacitor discharge ignition system
US3310723A (en) * 1963-10-18 1967-03-21 Honeywell Inc High voltage power supply for photographic flash apparatus
US3302629A (en) * 1964-09-21 1967-02-07 Motorola Inc Capacitor discharge ignition system with blocking oscillator charging circuit
US3334619A (en) * 1964-10-07 1967-08-08 Texas Instruments Inc Capacitive discharge ignition system and blocking oscillator power supply
US3687123A (en) * 1965-10-04 1972-08-29 Floyd M Minks Controlled electrical pulse source
US3418988A (en) * 1966-07-27 1968-12-31 Gen Motors Corp Ignition system for internal combustion engines
US3487822A (en) * 1967-11-29 1970-01-06 Motorola Inc Capacitor discharge ignition system
US3546528A (en) * 1968-01-24 1970-12-08 Rca Corp Capacitor discharge ignition circuit
US3496921A (en) * 1968-08-01 1970-02-24 Ford Motor Co Capacitive storage ignition system
US3560833A (en) * 1968-11-30 1971-02-02 Nippon Denso Co Ignition device with low source voltage compensating circuit
US3722489A (en) * 1969-03-13 1973-03-27 Howard Ass Inc Electronic relay and ignition system utilizing same
US3583378A (en) * 1969-04-08 1971-06-08 Warren K Pattee Capacitive discharge solid state ignition system
US3605714A (en) * 1969-06-11 1971-09-20 Eltra Corp Contactless ignition system
US3692009A (en) * 1969-10-18 1972-09-19 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3618580A (en) * 1969-12-17 1971-11-09 Motorola Inc Overvoltage and electronic relay circuit for capacitor discharge ignition systems
US3677253A (en) * 1970-01-13 1972-07-18 Nippon Denso Co Capacitor discharge type ignition system for internal combustion engines
US3639826A (en) * 1970-03-12 1972-02-01 Kenneth Grundberg Electronic control circuit
US3721224A (en) * 1970-03-13 1973-03-20 Ates Componenti Elettron Ignition circuit for spark plugs of internal-combustion engine
US3740589A (en) * 1971-02-16 1973-06-19 F Minks Blocking oscillator with current mode transformer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154205A (en) * 1976-08-18 1979-05-15 Semikron, Gesellschaft Fur Gleichrichterbau Capacitor ignition system for internal-combustion engines
US5561350A (en) * 1988-11-15 1996-10-01 Unison Industries Ignition System for a turbine engine
US5754011A (en) * 1995-07-14 1998-05-19 Unison Industries Limited Partnership Method and apparatus for controllably generating sparks in an ignition system or the like
US6034483A (en) * 1995-07-14 2000-03-07 Unison Industries, Inc. Method for generating and controlling spark plume characteristics
US6353293B1 (en) 1995-07-14 2002-03-05 Unison Industries Method and apparatus for controllably generating sparks in an ignition system or the like
US20020101188A1 (en) * 1995-07-14 2002-08-01 Unison Industries, Inc. Method and apparatus for controllably generating sparks in an ingnition system or the like
US7095181B2 (en) 1995-07-14 2006-08-22 Unsion Industries Method and apparatus for controllably generating sparks in an ignition system or the like
US6670777B1 (en) 2002-06-28 2003-12-30 Woodward Governor Company Ignition system and method
US20050276000A1 (en) * 2004-06-15 2005-12-15 Wilmot Theodore S Solid state turbine engine ignition exciter having elevated temperature operational capabiltiy
US7355300B2 (en) 2004-06-15 2008-04-08 Woodward Governor Company Solid state turbine engine ignition exciter having elevated temperature operational capability

Also Published As

Publication number Publication date
CH571791A5 (fi) 1976-01-15
FR2200696B1 (fi) 1977-05-27
FR2200696A1 (fi) 1974-04-19
NL7313190A (fi) 1974-03-27
DE2347930A1 (de) 1974-04-11
IT993415B (it) 1975-09-30
GB1426009A (en) 1976-02-25

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