发明名称 |
ELECTRONIC BALLAST AND METHOD FOR ARC STRAIGHTENING |
摘要 |
A method and apparatus for controlling a lamp ballast having a DC-DC converter with first and second MOSFETs acting as switches alternately connecting a DC power source to a power transformer, with an output of the power transformer being connected to a DC-AC inverter driving the lamp. The first and second MOSFETs in the DC-DC converter are alternately opened and closed at a frequency that is swe pt repeatedly between predetermined minimum and maximum frequencies. A microcontroller-based feedback element determines instantaneous power consumption by the lamp and controls the MOSFETs through a pulse width modulator to continuously adjust a duty cycle of signals driving gates of the MOSFETs to maintain a desired level of power consumption.
|
申请公布号 |
CA2405398(C) |
申请公布日期 |
2009.03.24 |
申请号 |
CA20022405398 |
申请日期 |
2002.09.26 |
申请人 |
OSRAM SYLVANIA INC. |
发明人 |
DUONG, CANH CONG;FIORELLO, RONALD |
分类号 |
H05B41/26;H05B41/292 |
主分类号 |
H05B41/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|