the circuit of the automatic anti-frosting controller for crops(2)

Published:2011/7/15 21:46:00 Author:Ariel Wang | Keyword: automatic, anti-frosting , controller , crops | From:SeekIC

When the atmospheric temperature is higher than +1℃ ,the control contact of the electric contact mercury thermometer Q is connected(the mercury column goes over the control electrode,the mercury connects the control electrode and the contact electrode).The thyristor VT is stopped as the gate outputs low level.When the temperature goes down and the condition of frost is formed,the control contact of the electric contact mercury thermometer Q is disconnected(the mercury column goes beneath the control electrode,the control electrode and contact electrode are disconnected).The gate has the trigger high level.And VT is conducted.There is current passing through in the filament of HL.It lights the gunpowder.The smoking material is inflamed.



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