PROXIMITY_SWITCH

Published:2009/7/16 5:50:00 Author:Jessie | From:SeekIC

Sensor plate and C2 form capacitive voltage divider across a-c supply. Value of C2 depends on proximity to sensor plate of human body, grounded object, or other reasonably conductive object. When voltage across C1 exceeds breakdown of neon, C1 and C2 discharge through scr gate, causing scr to trigger and energize load. Latching action is obtained by driving scr an ode circuit with d-c, for such applications as elevator floor selector buttons and door safety controls.- Silicon Controlled Rectifier Manual, Third Edition, General Electric Co., 1964, p 122.



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