Load driver circuit and ignition device using the same

Details Load driver circuit and ignition device using the same Load driver circuit and ignition device using the same

2007-12-19

2010-02-16

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Reexamination Certificate

active

07663857

ABSTRACT:
A protection circuit can be prevented from malfunctioning due to the parasitic operation attributable to the unstable base potential of a transistor. In one embodiment, the protection circuit can be constituted by a reverse transistor system where the bases of transistors are connected to the collectors so that bases and collector potentials are the same. With the above configuration, the base potential is stabilized, and even if a parasitic potential is applied to the base as noise, malfunction associated with transistors turn on due to parasitic operation can be prevented. Since the base potential is stabilized, the protection circuit transistors turn on with greater certainty when a surge current occurs such that the surge current is absorbed by the protection circuit and flows to GND.

REFERENCES:
patent: 5173755 (1992-12-01), Co et al.
patent: 6278328 (2001-08-01), Yamamoto et al.
patent: 2004-335979 (2003-12-01), None
patent: 2004-335979 (2004-11-01), None

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