초록 ▼

An ignition output stage is described, in particular for an internal combustion engine, in which the output stage is constructed as a two- or three-stage Darlington and provided either with an internal single-stage or an external multiple- stage clamping via a Zener diode for protection from surges,

An ignition output stage is described, in particular for an internal combustion engine, in which the output stage is constructed as a two- or three-stage Darlington and provided either with an internal single-stage or an external multiple- stage clamping via a Zener diode for protection from surges, while a short-circuit transistor is provided for protection from parasitic currents at the control terminal of the Darlington in parallel to the base-emitter junction of the ignition Darlington.

대표청구항 ▼

[ What is claimed is:] [1.] An ignition output stage for an internal combustion engine, comprising:a Darlington transistor including a driver transistor, a control transistor, a collector, a base-emitter junction, and an internal clamping, the driver transistor having a collector-emitter junction, t

[ What is claimed is:] [1.] An ignition output stage for an internal combustion engine, comprising:a Darlington transistor including a driver transistor, a control transistor, a collector, a base-emitter junction, and an internal clamping, the driver transistor having a collector-emitter junction, the internal clamping using a first Zener diode coupled in parallel to the collector-emitter junction of the driver transistor;a short-circuit transistor including a collector-emitter junction and a control terminal, the collector-emitter junction of the short-circuit transistor being coupled in parallel to the base-emitter junction of the Darlington transistor; anda high-resistance protective resistor dimensioned such that an adequate base current flows for the short-circuit transistor, rein the control terminal of the short-circuit transistor is coupled to the collector of the Darlington transistor via a series connection of the high-resistance protective resistor and a second Zener diode, wherein the second Zener diode has a blocking voltage in a range from 20 to 50 volts.