Discharge lamp drive device, discharge lamp drive method, light source device, and projector
AssigneeSeiko Epson Corporation
InventorsShigeyasu Soma, Tetsuo Terashima
Life of this patent
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Abstract
A discharge lamp drive device for driving a discharge lamp including a first electrode and a second electrode, include: a power supply unit which supplies alternating power to the discharge lamp by inputting alternating current between the first electrode and the second electrode, wherein the power supply unit includes a power reduction control unit which reduces the alternating power from a first level to a second level lower than the first level, and a duty ratio control unit which steppedly varies duty ratio of the alternating current in a predetermined period at the time of reduction of the alternating power.
Claims16
A discharge lamp drive device for driving a discharge lamp including a first electrode and a second electrode, comprising:
- a power supply unit that supplies alternating power to the discharge lamp by inputting alternating current between the first electrode and the second electrode;
- and
- a deterioration level detecting unit that detects a deterioration level of the electrodes,
- the power supply unit including
- a power reduction control unit that reduces the alternating power from a first level to a second level lower than the first level, and
- a duty ratio control unit that steppedly varies a duty ratio of the alternating current in a predetermined period at the time of reduction of the alternating power, the duty ratio control unit determining the duty ratio change between adjoining division terms based on the deterioration level detected by the deterioration level detecting unit.
A discharge lamp drive method for driving a discharge lamp including a first electrode and a second electrode, the method comprising:
- supplying alternating power to the discharge lamp by inputting alternating current between the first electrode and the second electrode;
- detecting a deterioration level of the electrodes;
- and
- determining a duty ratio change between adjoining division terms based on the deterioration level detected,
- wherein supplying the alternating power includes
- reducing the alternating power from a first level to a second level lower than the first level, and
- steppedly varying the duty ratio of the alternating current in a predetermined period at the time of reduction of the alternating power.
Dependencies are inferred from the claim text.