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US 2010/0148687 A1Published application
Lighting of discharge lamp by frequency control
AssigneeSeiko Epson Corporation
InventorKesatoshi Takeuchi
Life of this patent
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Abstract
A discharge lamp controlling apparatus includes a detector for detecting a discharge condition of a discharge lamp; a frequency changing unit for gradually changing a frequency of a voltage to be applied to the discharge lamp until the discharge condition reaches a predetermined lighting condition; and a voltage controller for controlling the voltage to be applied to the discharge lamp on the basis of the frequency changed by the frequency changing unit.
Claims6
A frequency control device controlling a frequency of a load device, comprising:
- a detector detecting an induced voltage or an induced current in the load device;
- and
- a frequency changing unit adjusting a frequency of a voltage to be applied to the load device so as to maintain the load device in a resonant condition in accordance with a difference in phase between the voltage or current to be applied to the load device and the induced voltage or the induced current in the load device.
A discharge lamp controlling apparatus comprising:
- a detector detecting an induced voltage or an induced current in the discharge lamp, and
- a frequency changing unit adjusting a frequency of a voltage to be applied to the discharge lamp so as to maintain the load device in a resonant condition in accordance with a difference in phase between the voltage or current to be applied to the load device and the induced voltage or the induced current in the discharge lamp.
Dependencies are inferred from the claim text.