Ignition apparatus for an internal combustion engine

Details Ignition apparatus for an internal combustion engine Ignition apparatus for an internal combustion engine

1998-05-22

1999-10-19

Argenbright, Tony M.

Internal-combustion engines

High tension ignition system

Current or voltage sensing in coil primary

123651, F02P 305, F02P 3055

Patent

active

059671289

ABSTRACT:
According to the invention, a primary winding of an ignition coil is coupled with an insulated-gate bipolar transistor (IGBT). The IGBT is controlled by a current restriction circuit, which includes a control transistor for performing the on-off operation of the IGBT such that the IGBT is made conductive upon occurrence of an ignition control signal, and nonconductive, when a primary current of the ignition coil reaches a certain value depending on a reference voltage determined by a bias circuit. The bias circuit has a condenser, which is charged by a base current of the control transistor to change the base potential of the transistor slowly, when the transistor is made nonconductive.

REFERENCES:
patent: 5500619 (1996-03-01), Miyasaka
patent: 5664550 (1997-09-01), Ito et al.
patent: 5723916 (1998-03-01), Disney et al.
patent: 5775310 (1998-07-01), Ito et al.

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