Discharge lamp lighting device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTaihei Kawasaka, Hidehiko Kinoshita, Akihiko Iwata, Takahiro Urakabe
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Abstract
A discharge lamp lighting device comprises a booster circuit 2 for boosting the voltage of a DC power source 1 in response to the ON-OFF operation of a switching element 2c, a startup discharge circuit 9 for performing the startup discharge of a discharge lamp 10 according to the boosted DC voltage, a voltage detection circuit 5 for detecting the boosted DC voltage, a control circuit 7b for outputting the pulse modulated by pulse width modulation to the switching element 2c, and a control circuit 7a for controlling the pulse output from the control circuit 7b to the switching element 2c to intermittently enabling or disabling the passage thereof.
Claims3
A discharge lamp lighting device comprising:
- a booster circuit, whose input side is connected to a DC power source, and having a switching element therein for boosting the voltage of the DC power source in response to the ON-OFF operation of the switching element;
- a startup discharge circuit for performing the startup discharge of the discharge lamp according to the DC voltage boosted by said booster circuit;
- a voltage detection circuit for detecting the DC voltage boosted by said booster circuit;
- a first control circuit for outputting the pulse modulated by pulse width modulation to said switching element;
- and
- a second control circuit for intermittently enabling or disabling the passage of the output pulse from said first control circuit to said switching element so that the DC voltage detected by said voltage detection circuit becomes a predetermined voltage.
Dependencies are inferred from the claim text.