Discharge lamp energizing circuit and method of energizing...

Details Discharge lamp energizing circuit and method of energizing... Discharge lamp energizing circuit and method of energizing...

2006-05-11

2008-10-28

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S307000

Reexamination Certificate

active

07443110

ABSTRACT:
A discharge lamp energizing circuit has a pulse generating circuit and a control circuit. The pulse generating circuit has a DC power supply unit, and a transformer, a first semiconductor switch, and a second semiconductor switch which are connected in series across the DC power supply unit. The control circuit has a switching control circuit and a frequency setting circuit. The frequency setting circuit has a voltage-to-frequency converting circuit for converting an input voltage into a frequency signal, a frequency information table recorded in a memory, for example, and storing data representative of changes in the input voltage per unit time, a data reading circuit for successively reading the stored data from the frequency information table, and a voltage control circuit for modulating the input voltage based on the read data.

REFERENCES:
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patent: 6490177 (2002-12-01), Figueroa
patent: 6693393 (2004-02-01), Konishi et al.
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patent: 2003/0209993 (2003-11-01), Ito et al.
patent: 2003/0230938 (2003-12-01), Hatano et al.
patent: A 2003-133096 (2003-05-01), None
patent: A 2003-272887 (2003-09-01), None
patent: A 2004-72992 (2004-03-01), None
patent: A 2004-72994 (2004-03-01), None

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