发明名称 |
STARTUP CONTROL FOR A HIGH PRESSURE DISCHARGE LAMP BALLAST |
摘要 |
A high pressure discharge lamp ballast is provided with a control operation for stable transition from a lamp ignition mode into a preheating mode. An inverter is coupled across a DC source and has a plurality of switching elements coupled to the high pressure discharge lamp. A series resonant LC circuit is coupled to the inverter outputs and to the high pressure discharge lamp. A control circuit is coupled to the switching elements and configured to control switching operation. An ignition mode has one or more time periods during each of which a driving frequency of the switching elements is swept through a predetermined range of frequencies and then controlled at a first driving frequency less than the predetermined range of frequencies. A preheating mode follows wherein the switching elements are controlled at a second driving frequency less than the predetermined range of frequencies.
|
申请公布号 |
US2010194302(A1) |
申请公布日期 |
2010.08.05 |
申请号 |
US20100694099 |
申请日期 |
2010.01.26 |
申请人 |
NAKADA KATSUYOSHI;NAKANO TOMOYUKI;WATANABE KOJI |
发明人 |
NAKADA KATSUYOSHI;NAKANO TOMOYUKI;WATANABE KOJI |
分类号 |
H05B41/36 |
主分类号 |
H05B41/36 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|