Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1976-06-18
1978-02-28
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
123148E, 307273, 307292, H05B 3702, H05B 3904, H05B 4114
Patent
active
040769976
ABSTRACT:
A monostable multivibrator circuit is disclosed which uses a feedback diode to couple the output signal of the monostable back to one terminal of the timing capacitor and thereby maintain the voltage at this capacitor terminal at a constant level for a duration equal to the pulse duration of the monostable output. A transistorized internal combustion engine ignition system is illustrated which incorporates the diode feedback monostable circuit. A trigger input signal actuates a first transistor switch which creates an abrupt negative transition that is coupled across a timing capacitor and results in turning off a second transistor for a predetermined amount of time. A third transistor monitors and inverts the output of the second transistor and produces an output signal at its collector. This inverted output signal forms the output of the monostable multivibrator and this signal is fed back to one terminal of the timing capacitor by a feedback diode. Thus the present invention basically comprises a monostable multivibrator circuit having an output inverter stage in which the output of the inverter stage is coupled back to one terminal of the timing capacitor by a feedback diode.
REFERENCES:
patent: 3303353 (1967-02-01), Sacha
patent: 3309528 (1967-03-01), Ziegler
patent: 3374365 (1968-03-01), Lyles et al.
patent: 3517220 (1970-06-01), Gibson et al.
patent: 3597635 (1971-08-01), Reich
Chatmon, Jr. Saxfield
Gillman James W.
Lisa Donald J.
Melamed Phillip H.
Motorola Inc.
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