Circuit arrangement and method for starting and operating...

Details Circuit arrangement and method for starting and operating... Circuit arrangement and method for starting and operating...

2005-08-23

2005-08-23

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S307000, C315S308000, C315SDIG005, C315SDIG007

Reexamination Certificate

active

06933681

ABSTRACT:
In the case of circuit arrangements for operating discharge lamps (Lp1, Lp2) which include a charge pump for reducing line current harmonics, an energy imbalance occurs when the lamps are started. In order for this not to lead to components being destroyed, but for sufficient ignition voltage nevertheless to be generated at the lamps (Lp1, Lp2), a threshold switch (MOV, TH) monitors the frequency of an inverter included in the circuit arrangement.

REFERENCES:
patent: 5404082 (1995-04-01), Hernandez et al.
patent: 5410221 (1995-04-01), Mattas et al.
patent: 5604411 (1997-02-01), Venkitasubrahmanian et al.
patent: 5612597 (1997-03-01), Wood
patent: 0 621 743 (1994-10-01), None
Jinrong Qian et al., “Analysis, Design and Experiments of a High-Power-Factor Electronic Ballast”,IEEE Transaction on Industry Applications, vol. 34, No. 3, May/Jun. 1998.
Jinrong Qian et al., “New Continuous-Input Current Charge Pump Power-Factor-Correction Electronic Ballast”,IEEE Transaction on Industry Applications, vol. 35, No. 2, Mar./Apr. 1999.

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