Internal-combustion engines – High tension ignition system – Having a specific ignition coil
Patent
1993-02-17
1994-12-20
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Having a specific ignition coil
F02P 1100
Patent
active
053738268
ABSTRACT:
An ignition apparatus for an internal combustion engine having a current limiting function is simple in construction and can avoid variations In the current limiting values for respective power transistors 103. A current limiting circuit 109 includes a common resistor 105 connected at one end thereof to a power supply 101 and at the other end thereof to a plurality of ignition voltage generating circuits 104. an operational amplifier 107 making a comparison between a voltage V.sub.105 across the resistor 105 and a reference voltage Vr which corresponds to a predetermined upper limit current for each power transistor 103 and generating an output signal A of a magnitude proportional to a difference (V.sub.105 -Vr) therebetween, and a plurality of transistors 108 provided one for each power transistor 103 and connected to receive the output signal A from the operational amplifier 107 for limiting a current through a corresponding power transistor 103 in response to the output signal A. The current limiting circuit 107 serves to sense a current flowing through each power transistor 103 and limit it to a predetermined upper limit value to thereby protect each power transistor from damage due to an overcurrent therethrough.
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Koiwa Mitsuru
Taruya Masaaki
Mitsubishi Denki K.K.
Nelli Raymond A.
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