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US 7,598,678 B2Granted
Lamp lighting apparatus
AssigneeMitsubishi Electric Corporation
InventorsShigeki Harada, Taichiro Tamida, Akihiko Iwata
Life of this patent
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Abstract
A lamp lighting apparatus includes an arc spot movement detector (5) for monitoring an DC voltage Vb which is the bus voltage of an inverter (3), and for detecting a movement of an arc spot which appears before a lamp 1 enters a state where human beings can recognize a flicker of the lamp (1), and, when the arc spot movement detector (5) detects a movement of the arc spot, controls a switch (2a) of a DCDC converter (2) so as to suppress the movement of the arc spot.
Claims16
A lamp lighting apparatus comprising:
- a lamp light means for applying an AC rectangular wave to a discharge lamp so as to light the discharge lamp, said lamp light means including a DC power supply, a DCDC converter for adjusting an output of said DC power supply, and an inverter for converting an output of said DCDC converter into the AC rectangular wave;
- an arc spot movement detecting means for monitoring an electric parameter of said lamp light means so as to detect a movement of an arc spot lying within a band of frequencies higher than a critical flicker frequency;
- and
- an arc spot movement suppressing means for, when said arc spot movement detecting means detects a movement of the arc spot, controlling the AC rectangular wave applied to said discharge lamp by said lamp light means according to a detection signal indicating the detection of the movement of the arc spot from said arc spot movement detecting means so as to perform a process of suppressing the movement of the arc spot.
1 more element
A lamp lighting apparatus comprising:
- a lamp light means for applying an AC rectangular wave to a discharge lamp so as to light the discharge lamp;
- an arc spot movement detecting means for monitoring an electric parameter of said lamp light means so as to detect a movement of an arc spot lying within a band of frequencies higher than a critical flicker frequency;
- and
- an arc spot movement suppressing means for, when said arc spot movement detecting means detects a movement of the arc spot, controlling an angle of rotation of the discharge lamp around an axis of rotation, which is an electrode axis which connects both electrodes of the discharge lamp with each other, according to a detection signal indicating the detection of the movement of the arc spot from said arc spot movement detecting means so as to perform a process of suppressing the movement of the arc spot.
1 more element
Dependencies are inferred from the claim text.