发明名称 |
Discharge lamp circuit which limits ignition voltage across a second discharge lamp after a first discharge lamp has already ignited |
摘要 |
A circuit arrangement for igniting and operating at least two discharge lamps. the circuit is provided with input terminals (K1,K2) for connection to a supply voltage source and a circuit I (SC, S1, S2) coupled to the input terminals for generating a high-frequency voltage from a supply voltage delivered by the supply voltage source. A load branch B is coupled to the circuit I and comprising a first branch A including first terminals (K3,K3') for accommodating a discharge lamp and a first inductive element L1, and a second branch C shunting the first branch A and comprising further terminals (K4,K4') for accommodating a discharge lamp and a second inductive element L2 which is magnetically coupled to the first inductive element L1. A circuit II limits the voltage across branch A and branch C to a first value during the ignition of the discharge lamps. A circuit III limits the voltage across branch A and branch C to a second value after the ignition of one of the discharge lamps thereby preventing the occurrence of ignition voltages of very high amplitude across the discharge lamp igniting last.
|
申请公布号 |
US6028400(A) |
申请公布日期 |
2000.02.22 |
申请号 |
US19960710995 |
申请日期 |
1996.09.25 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
POL, NICOLAAS H. M.;VELDMAN, PAUL R.;VAN MEURS, JOHANNES M. |
分类号 |
H05B41/24;H05B41/282;(IPC1-7):H05B37/02 |
主分类号 |
H05B41/24 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|