Circuit for reducing electromagnetic interference from magnetic

Details Circuit for reducing electromagnetic interference from magnetic Circuit for reducing electromagnetic interference from magnetic

1986-03-06

1987-05-12

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including means for using, or compensating for, the induced...

340365L, 84DIG7, 4004792, H01H 4700

Patent

active

046654615

ABSTRACT:
The present disclosure describes circuit variants for reducing electromagnetic interference from saturable core keyboards to acceptable levels. The invention finds particular application in conjunction with capacitive-discharge scan techniques used in such keyboards. In order to attenuate the external field resulting from such techniques, a circuit is taught which effectively disconnects the scan line array from the capacitor charging circuit during the time between scans. A second variant, when added to the first, further reduces interference by disconnecting the entire scan circuit from the supply potential during the scan time thereby eliminating steady-state currents and turnoff oscillatory transients.

REFERENCES:
patent: 4494109 (1985-01-01), Bernin
patent: 4529967 (1985-07-01), Gifft

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