Fluorescent lamp drive system with transformer over-voltage prot

Details Fluorescent lamp drive system with transformer over-voltage prot Fluorescent lamp drive system with transformer over-voltage prot

1997-10-31

1999-09-07

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 36, 361 38, H02H 704

Patent

active

059496339

ABSTRACT:
A transformer over-voltage protection circuit shuts down a resonant inverter when high voltages occur at the output of a transformer. The high voltages can be caused by a broken or removed display tube. The system is designed to be used in display system, such as, an active matrix liquid crystal display (AMLCD). The system senses the voltage at the output of the transformer by utilizing a tickler or a tertiary winding. The signal from the tertiary winding is rectified and compared to a threshold. If the signal from the tertiary winding is greater than the threshold, the inverter is shut down for a period of time.

REFERENCES:
patent: 4114072 (1978-09-01), Willis
patent: 4236187 (1980-11-01), Mochizuki et al.
patent: 4709321 (1987-11-01), Trantham
patent: 4788618 (1988-11-01), Kimura
patent: 5079666 (1992-01-01), Najm
patent: 5572413 (1996-11-01), Hirahara

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