Browse Prior Art Database

Eliminating The Effect Of Contact Bounce

IP.com Disclosure Number: IPCOM000096926D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Bond, GL: AUTHOR

Abstract

This circuit eliminates the effect of contact bounce or chatter. When contacts 22 and 23 of switch 21 are open, capacitor 31 is charged to the value of voltage source Va. A voltage signal approaching the value of Va appears on conductor 39. When the switch contacts are closed, a discharge circuit comprising switch 21 and resistor 30 is completed. The voltage on capacitor 31 is quickly discharged. Sufficient voltage is impressed across discharge device 37 to render it conductive. A step function change in voltage appears on output conductor 39.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Eliminating The Effect Of Contact Bounce

This circuit eliminates the effect of contact bounce or chatter. When contacts 22 and 23 of switch 21 are open, capacitor 31 is charged to the value of voltage source Va. A voltage signal approaching the value of Va appears on conductor 39. When the switch contacts are closed, a discharge circuit comprising switch 21 and resistor 30 is completed. The voltage on capacitor 31 is quickly discharged. Sufficient voltage is impressed across discharge device 37 to render it conductive. A step function change in voltage appears on output conductor 39.

The conductor is clamped to voltage source Vb by diodes 41 and 42. When the switch is opened, capacitor 31 is charged to a voltage level at which discharge device 37 is extinguished to end the pulse on conductor 39. Discharge device 37 requires a higher voltage to become conductive than is required to extinguish it. The output pulse has a sharp leading edge and is unaffected by contact bounce or chatter.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]