Interference-protected, switch-controlled square wave generation

Details Interference-protected, switch-controlled square wave generation Interference-protected, switch-controlled square wave generation

1976-11-24

1978-05-09

Heyman, John S.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

123148E, 307247A, 307359, 307237, F02P 306

Patent

active

040889270

ABSTRACT:
To provide an undistorted square wave output signal under control of a switch subject to contact chatter so that the square wave will accurately reflect the operating instant of the switch, as commanded, regardless of contact chatter, a timing circuit is provided having a timing capacitor and a charge and discharge circuit therefor, connected to a threshold circuit, the threshold circuit response level and the charge circuit of the timing capacitor being dimensioned to cause the capacitor to charge to a level such that the threshold circuit responds only when the switch has changed state, typically closed after interrupting an inductive load, such as the primary of a spark plug, for a predetermined time period as determined by the switch contact chatter characteristics of the switch itself, for example about 0.6 to 1 millisecond in the case of automotive ignition breaker switches; a feedback connection is provided between the threshold circuit and the input stage to the circuit to disable transfer of a signal representative of change of the switch through the circuit unless the threshold level of the threshold circuit has been exceeded so that the threshold circuit could respond.

REFERENCES:
patent: 3434463 (1969-03-01), Bartch
patent: 3716728 (1973-02-01), Hachenburg
patent: 3854466 (1974-12-01), Steinberg et al.
patent: 3925682 (1975-12-01), Hamada
patent: 3978838 (1976-09-01), Oister
patent: 4015145 (1977-03-01), Stewart

Affiliated with

Also associated with

Rating

Interference-protected, switch-controlled square wave generation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interference-protected, switch-controlled square wave generation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interference-protected, switch-controlled square wave generation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2359694