Below 3kw electromagnetic valve non-contact bi-directional thyristor connect circuit

Published:2011/8/29 0:41:00 Author:Jessie | Keyword: electromagnetic valve, non-contact, bi-directional thyristor | From:SeekIC

When the switchgets the power, light-emitting diode LD52 is connected. The photoconductor FW9802 which accessed to bi-directional thyristor'sdoor loop is decreased to 2.5kΩ, and it makes the loop's current enoughfor trigger thyristor's conduction, electromagnetic valve power supply. After 5s, RC charging circuit makes T1 connect, T2 cut off, light-emitting diode current interrupt, and then photoconductor's value increase, thyristor shut off, electromagnetic valve blackout.



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