Discharge lamp lighting device
First Claim
1. A discharge lamp lighting device comprising:
- a transformer for supplying an illuminating voltage to a dielectric barrier discharge lamp;
a voltage control circuit for supplying voltage to a primary side of said transformer;
a push-pull circuit for supplying the output of said voltage control circuit to the primary side of said transformer, in positive phase or reverse phase; and
a start-up control circuit which detects an illumination current of said dielectric barrier discharge lamp, and switches the output voltage of said voltage control circuit between at start-up time and other than start-up time of said dielectric barrier discharge lamp.
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Accused Products
Abstract
Output of a chopper circuit is converted to a rectangular wave by a push-pull circuit, and is provided to a step-up transformer. When a switch is turned on, the control voltage of the chopper circuit is relatively low, and a high output voltage is provided to the transformer. Thus, the discharge lamp starts with certainty. When the discharge lamp starts, the transistor is turned on, and the resistance generating the control voltage is connected in parallel to other resistance, and the control voltage is increased. Thus, the output of the chopper circuit is decreased, and thereafter becomes a constant voltage. Thus, the dielectric barrier discharge lamp is started with certainty, and also is driven with stability.
11 Citations
10 Claims
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1. A discharge lamp lighting device comprising:
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a transformer for supplying an illuminating voltage to a dielectric barrier discharge lamp;
a voltage control circuit for supplying voltage to a primary side of said transformer;
a push-pull circuit for supplying the output of said voltage control circuit to the primary side of said transformer, in positive phase or reverse phase; and
a start-up control circuit which detects an illumination current of said dielectric barrier discharge lamp, and switches the output voltage of said voltage control circuit between at start-up time and other than start-up time of said dielectric barrier discharge lamp. - View Dependent Claims (2, 3, 4, 5)
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6. A discharge lamp lighting device comprising:
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a transformer for supplying an illuminating voltage to a dielectric barrier discharge lamp connected on a secondary side;
a voltage control circuit for supplying voltage to a primary side of said transformer;
a push-pull circuit for supplying the output of said voltage control circuit to the primary side of said transformer, in positive phase or reverse phase;
an oscillating circuit for generating a signal of which the oscillating frequency can be changed; and
a start-up control circuit which detects the start-up time or other than start-up time of said dielectric barrier discharge lamp, based on the illumination current of said dielectric barrier discharge lamp, and switches the oscillating frequency of said oscillating circuit depending on said start-up time or illuminating time. - View Dependent Claims (7, 8, 9, 10)
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Specification