Trigger pulse generator for gas discharge lamps

Details Trigger pulse generator for gas discharge lamps Trigger pulse generator for gas discharge lamps

1979-04-16

1981-01-27

Smith, Alfred E.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

315106, 315DIG5, H05B 3700, H05B 4114, H05B 4118

Patent

active

042478030

ABSTRACT:
An ignition trigger circuit for luminous and fluorescent discharge tubes, especially for cold electrode tubes. The ignition pulses are generated by placing across the gas discharge tube a relay-activated switch. The relay windings are connected in series with a rectifying diode and a capacitor across the A.C. power source. When a charging current flows into the capacitor, the relay windings are actuated at each A.C. cycle. By suitable choice of the electrical dimensions, the charging phase of the capacitor may be extended over several A.C. cycles, thereby causing repeated actuations of the relay and closures of the switch. Once the charging current falls below the holding current of the relay, the short-circuiting switch stays open permanently. A discharge resistor is provided to return the circuit to its initial state after being removed from the A.C. current source.

REFERENCES:
patent: 4152628 (1979-05-01), Rottier

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