초록 ▼

An igniter for an internal combustion engine includes a switching element performing flow and break control for a primary current flowing through an ignition coil depending upon a spark control signal output from an electronic engine control unit and a current limiting circuit limiting a current flo

An igniter for an internal combustion engine includes a switching element performing flow and break control for a primary current flowing through an ignition coil depending upon a spark control signal output from an electronic engine control unit and a current limiting circuit limiting a current flowing through the switching element. The switching element is formed with an insulated gate bipolar transistor. The igniter further comprises a current detecting load element for detecting current flowing through the insulated gate bipolar transistor, and a diode being provided between the current detecting load element and the self-isolation N-MOS transistor, which diode having an opposite temperature coefficient to that of the current detecting load element. Also, in order to certainly provide a contact current of a connection terminal between the electronic engine control unit and the igniter and to assure detecting of circuit breakage between the electronic engine control unit and the igniter, an input impedance of the igniter is set intentionally or a current adjusting bleeder resistor is set to flow a current greater than or equal to 1 mA through the connecting portion.

대표청구항 ▼

[ What is claimed is:] [1.] An igniter for an internal combustion engine comprising:a switching element performing flow and break control for a primary current flowing through an ignition coil depending upon a spark control signal output from an electronic engine control unit; anda current limiting

[ What is claimed is:] [1.] An igniter for an internal combustion engine comprising:a switching element performing flow and break control for a primary current flowing through an ignition coil depending upon a spark control signal output from an electronic engine control unit; anda current limiting circuit limiting a current flowing through said switching element;said switching element being constructed with an insulated gate bipolar transistor;said current limiting circuit being constructed with self-isolation N-MOS transistor; andsaid insulated gate bipolar transistor and said self-isolation N-MOS transistor being formed in a common semiconductor substrate.