Process for burning a carbonaceous fuel using a high-energy alternating current wave

Patent · Tue Dec 01 04:00:00 EST 1987

OSTI ID:5487387

Zivkovich, A

This patent describes an electronic ignition circuit for applying a high-frequency, high-voltage wave to a spark gap of a spark ignition device in a combustion chamber into which a combustible fuel is introduced and including a.c. means for providing an alternating current high-voltage, high-frequency wave, and switching means coupled to the a.c. means providing the wave during ignition intervals, and in which the a.c. means includes a d.c.-d.c. converter that is formed of a step-up transformer having a center tap primary, and a secondary, a pair of transistors coupled in push-pull between the primary and a battery potential, with a center tap of the primary being connected to a complementary battery potential. The transistors have control electrodes, feedback means coupled to the control electrodes and supply a feedback signal thereto so that the primary receives oscillations of current through the transistors, and rectifier means coupled to the secondary to produce a high voltage d.c. current, and further including a chopper circuit connected to the rectifier means for producing a high voltage a.c. current. The improvement in which the chopper circuit produces the high voltage a.c. current at a substantially constant predetermined frequency, and includes a trigger circuit coupled to the feedback means and to the pair of push-pull transistors to switch the chopper circuit on and off at the predetermined frequency with oscillations of the transformer primary such that the output wave has a peak voltage of 25,000 to 200,000 volts and at the predetermined frequency in the range of 8 KHz to 80 KHz.

• Assignee: NOV; EDB-88-050199; NOV-88-094403
• Patent Number(s): US 4710681
• OSTI ID: 5487387
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
42 ENGINEERING
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
ALTERNATING CURRENT
COMBUSTION CHAMBERS
CURRENTS
DC TO DC CONVERTERS
DESIGN
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRIC SPARKS
ELECTRICAL EQUIPMENT
EQUIPMENT
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
IGNITION SYSTEMS
OPERATION
RECTIFIERS
SEMICONDUCTOR DEVICES
TRANSFORMERS
TRANSISTORS