Internal-combustion engines – High tension ignition system – Using capacitive storage and discharge for spark energy
Reexamination Certificate
2007-03-08
2008-09-02
Kwon, John T (Department: 3747)
Internal-combustion engines
High tension ignition system
Using capacitive storage and discharge for spark energy
C123S594000, C123S650000, C324S380000
Reexamination Certificate
active
07418956
ABSTRACT:
An ignition apparatus for an internal combustion engine can be produced at low cost and small size by preventing the generation of a spark at a spark plug due to a turn-on voltage with a simple ignition coil construction having no energy loss. The apparatus include an ignition coil having a primary coil and a secondary coil, a spark plug to which a high voltage from the secondary coil is impressed, and a coil driver for driving the ignition coil. The coil driver has a switching element for controlling the primary current, an IC for driving the switching element, and a turn-on voltage prevention circuit inserted between a secondary coil low-voltage side terminal and ground. The turn-on voltage prevention circuit is composed of a parallel circuit comprising a diode in the form of a bare chip and a thick film resistor, and is mounted on the same substrate together with the IC.
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Aida Futoshi
Naruse Yusuke
Kwon John T
Mitsubishi Electric Corporation
Sughrue & Mion, PLLC
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