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Reed Relay Trigger

IP.com Disclosure Number: IPCOM000097455D
Original Publication Date: 1962-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Arnold, BH: AUTHOR

Abstract

This trigger uses reed relays each having a single normally open contact.

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Reed Relay Trigger

This trigger uses reed relays each having a single normally open contact.

Source 17 supplies a voltage of +12 volts while source 18 provides -12 volts. A voltage less than 12 volts is insufficient to pick up a reed relay. A voltage of 6 volts is sufficient to hold it picked up. When the trigger circuit is initially connected to sources 17 and 18, since resistor 20 has the same resistance as coil 15, relay 11 is immediately picked up. This is because 12 volts are across its coil. Relay 10 is de-energized because the resistors 16 and 19 are of such a value coil 13 has a bias voltage of only 6 volts.

Upon closure of switch 26, a positive pulse is delivered from input 27 in parallel through both capacitors 21 and 23 to opposite ends of coil 13 of relay 10. Due to the different decay rates of the capacitors, a sufficient additional voltage above the bias voltage is developed across the latter coil to pick up the relay 10 for shunting the relay coil 15 and maintaining the output 30 connected to source 17 even after the pulse ends. When relay 11 drops out, the large capacitor 21 is cut off from input 27. The next positive pulse from the input sends current only through the smaller capacitor 23, thus dropping relay 10 by reversing the current flow through its coil. When relay 10 drops, it opens the shunt circuit around coil 15, thus causing relay 11 to be picked up. This returns the output to the initial condition and the circuit to the same condition...