DISCHARGE LAMP LIGHTING DEVICE
1 Assignment
0 Petitions
Accused Products
Abstract
A transformer 6 and a photocoupler 5 are provided to ensure insulation between a primary side circuit section 10 connected to an alternating current power supply 2, and a secondary side circuit section 20 for applying a voltage to a lamp 4. A detection circuit section 22E, provided in the secondary side circuit section 20, detects an output voltage and an output current of the lamp 4 to detect a deviation from a predetermined power. A signal corresponding to the deviation, which has been detected by the detection circuit section 22E, is transmitted to the primary side circuit section 10 via the photocoupler 5 provided between the primary side circuit section 10 and the secondary side circuit section 20. A switching control section 13, provided in the primary side circuit section 10, carries out switching control for constant power lighting based on the signal transmitted from the photocoupler 5.
48 Citations
16 Claims
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1-3. -3. (canceled)
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4. A discharge lamp lighting device for lighting a discharge lamp, the device comprising:
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a primary side circuit section connected to a power supply; a transformer, connected to the primary side circuit section, for transforming a voltage; a secondary side circuit section, connected to the transformer, for applying the transformed voltage to the discharge lamp; a detection circuit section, provided in the secondary side circuit section, for detecting an output voltage and an output current of the discharge lamp to detect a deviation from a predetermined power; a signal transmission element, provided between the primary side circuit section and the secondary side circuit section, for transmitting a signal corresponding to the deviation, which has been detected by the detection circuit section, to the primary side circuit section; and a switching control section, provided in the primary side circuit section, for carrying out switching control for constant power lighting based on the signal transmitted from the signal transmission element. - View Dependent Claims (5, 6)
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7. A discharge lamp lighting device for lighting a discharge lamp, the device comprising:
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a primary side circuit section connected to a power supply; a transformer, connected to the primary side circuit section, for transforming a voltage; a secondary side circuit section connected to the transformer, for applying the transformed voltage to the discharge lamp; a detection circuit section, provided in the secondary side circuit section, for detecting an output voltage and an output current of the discharge lamp to detect a deviation from a predetermined power; a signal transmission element, provided between the primary side circuit section and the secondary side circuit section, for transmitting a signal corresponding to the deviation, which has been detected by the detection circuit section, to the primary side circuit section; and a switching control section, provided in the primary side circuit section, for carrying out switching control for constant power lighting based on the signal transmitted from the signal transmission element, wherein a secondary side winding of the transformer comprises a first winding and a second winding, the secondary side circuit section comprising; an auxiliary circuit for applying a voltage, transformed by the first winding and the second winding, to the discharge lamp until a predetermined condition is met after the startup of the discharge lamp; and a main circuit for applying a voltage, transformed by the first winding, to the discharge lamp after the predetermined condition has been met. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification