Patent ID: 9730304
Date: 2017-08-08
CPC Classifications: G03B,H01J,H05B,Y02B

Claim:
1. A discharge lamp lighting apparatus for supplying alternating current to a discharge lamp having a pair of electrodes arranged to be opposite to each other within a discharge vessel in which a predetermined gas is sealed, the discharge lamp lighting apparatus comprising: a pulse generation part that generates pulse; and a power supply part that transforms supplied DC voltage to DC applied voltage, converts the DC applied voltage into the alternating current corresponding to a frequency of the pulse, and supplies the alternating current to the discharge lamp, wherein the pulse generation part is structured to alternately output a first pulse and a second pulse that has a lower frequency than the first pulse, set a frequency of the second pulse to a predetermined reference frequency when a value of the applied voltage coincides with a predetermined reference value, set the frequency of the second pulse to a lower frequency than the reference frequency when the value of the applied voltage exceeds the reference value, and set the frequency of the second pulse to a frequency that is equal to or lower than the reference frequency when the value of the applied voltage falls below the reference value.