Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary
Patent
1991-10-01
1993-04-06
Dolinar, Andrew M.
Internal-combustion engines
High tension ignition system
Current or voltage sensing in coil primary
315209T, 315224, F02P 305
Patent
active
051994070
ABSTRACT:
A current limiter in an ignition apparatus for an internal combustion engine including a differential amplifier 20 is able to limit a primary winding current of an ignition coil to a prescribed limit value which is independent of a voltage as sensed by a current sensing resistor 11, thus providing a highly stable operating characteristic. The factor of current amplification of the differential amplifier can be increased without accompanying oscillations of the current limiter. The current sensing resistor senses a voltage corresponding to a current flowing from the primary winding of the ignition coil to a power transistor 4 which turns on and off the power supply to the ignition coil. A reference voltage source 12 generates a reference voltage for comparison with the voltage sensed by the current sensing resistor. A differential amplifier absorbs a part of a base current supplied from a storage battery to a base of the power transistor on the basis of a difference between the reference voltage and the voltage sensed by the current sensing resistor. A plurality of output transistors 25, 102 are coupled to form a Darlington circuit which is connected between the differential amplifier and the base of the power transistor. Another reference voltage source 12" may be provided for generating a second reference voltage, the second reference voltage source being connected between the current sensing resistor and the second input terminal of the differential amplifier for supplying thereto a total sum of the voltage sensed by the current sensing resistor and the second reference voltage.
REFERENCES:
patent: 3838672 (1974-10-01), Richards et al.
patent: 3882840 (1975-05-01), Adamian et al.
patent: 4899715 (1990-02-01), Koiwa et al.
Koiwa Mitsuru
Sawazaki Nobuyuki
Taruya Masaaki
Dolinar Andrew M.
Mitsubishi Denki & Kabushiki Kaisha
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