Protective circuit for fluorescent lamp stabilizer

Details Protective circuit for fluorescent lamp stabilizer Protective circuit for fluorescent lamp stabilizer

1990-04-30

1991-09-24

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315219, 315DIG7, H05B 3702

Patent

active

050516612

ABSTRACT:
A protective circuit for a fluorescent lamp includes a stabilizer circuit for preventing breakdown of the lamp as it becomes worn. Known stabilizers are high speed switching circuits which can break down and become unstable in certain conditions to cause an on-off cycling of the lamp. This is prevented by a protective circuit, according to the present invention, which incorporates a thyristor connected to a blocking transistor. A sensing element triggers the thyristor in response to an abnormal voltage or in response to an overheated condition. The thyristor then activates a transistor to open the lamp control circuit and to prevent its reclosing, thereby holding the lamp off.

REFERENCES:
patent: 4525649 (1985-06-01), Knoll
patent: 4562383 (1985-12-01), Kerscher
patent: 4709189 (1987-11-01), Kuchii
patent: 4723098 (1988-02-01), Grubbs
patent: 4797803 (1989-01-01), Carroll
patent: 4949013 (1990-08-01), Zuchtnegel

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