Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary
Patent
1995-11-01
1997-02-18
Dolinar, Andrew M.
Internal-combustion engines
High tension ignition system
Current or voltage sensing in coil primary
315224, 323284, 327322, F02P 305, G05F 1575
Patent
active
056033087
ABSTRACT:
An IGBT driving circuit includes an IGBT connected in series with a primary winding of an ignition coil and a current detecting resistor. A transistor is connected to the gate of the IGBT to apply a gate voltage in response to an ignition signal. A comparator compares a voltage produced across the current detecting resistor with a comparison voltage. An NPN transistor connected to the gate of the IGBT turns on and off in response to the comparison result of the comparator to adjust the gate voltage. The gate voltage is fed back to the detection terminal side of the comparator for oscillation suppression through an oscillation suppressing resistor. A charge/discharge control resistor is connected between the gate of the IGBT and the oscillation suppressing resistor and a diode is connected in parallel with the charge/discharge control resistor, so that the electric current flowing to the IGBT is maintained constant.
REFERENCES:
patent: 5045964 (1991-09-01), Bennett et al.
patent: 5397964 (1995-03-01), Edwards
Enomoto Mitsuyasu
Ooyabu Shinji
Dolinar Andrew M.
Nippondenso Co. Ltd.
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