H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/14 (2006.01) H01J 61/54 (2006.01) H05B 41/18 (2006.01) H05B 41/282 (2006.01) H05B 41/36 (2006.01)
Patent
CA 2679816
A high pressure discharge lamp lighting device includes a DC power source circuit; a power supply circuit for converting an output from the DC power source circuit into a square wave AC output to be supplied to a high pressure discharge lamp; a starting circuit for applying a high voltage output for lamp startup to the high pressure discharge lamp; a control circuit; and a half-wave discharge detection circuit for detecting a half-wave discharge. The detection circuit detects the half-wave discharge at an initial stage of the lamp startup and the control circuit controls the magnitude of a voltage of a square wave half period of one polarity having a load voltage of a larger magnitude and that of a square wave half period of the other polarity having a load voltage of a smaller magnitude to approximate to each other.
Kamoi Takeshi
Komatsu Naoki
Kumagai Jun
Matsuzaki Nobutoshi
Nagata Satoru
Cassan Maclean
Panasonic Electric Works Co. Ltd.
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