发明名称 |
Two-wire ballast for fluorescent tube dimming |
摘要 |
A two-wire ballast arrangement for fluorescent lamp dimming is disclosed in which a modified transformer utilizing the natural leakage inductance associated with ballast transformers is used to achieve full-range fluorescent tube dimming at substantially constant filament heating voltage. Additional auxiliary secondary windings are disposed in predetermined spaced relationship to the primary winding and the main secondary winding to create a "tapping" effect in the magnetic flux. The mutual leakage inductances of the auxiliary secondaries in relation to the primary and the main secondary is utilized in a manner such that as the voltage is decreased to the primary, the voltage of the auxiliary secondary windings remains substantially constant to hold the filament heating voltage substantially constant. Embodiments are disclosed for use either with conventional 50/60 Hz or at high frequency, i.e. above 400 Hz.
|
申请公布号 |
US4350933(A) |
申请公布日期 |
1982.09.21 |
申请号 |
US19800210649 |
申请日期 |
1980.11.26 |
申请人 |
HONEYWELL INC. |
发明人 |
AGARWALA, POONAM;ZANSKY, ZOLTAN |
分类号 |
H05B41/392;(IPC1-7):H05B41/16;H05B41/39 |
主分类号 |
H05B41/392 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|