Shutdown circuit

Details Shutdown circuit Shutdown circuit

2007-03-13

2007-03-13

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S307000, C315S291000

Reexamination Certificate

active

11455089

ABSTRACT:
The invention relates to an electronic ballast for operating a discharge lamp LA, in which a pump circuit D6, C8, C9, L1charges an intermediate circuit capacitor C6from the AC voltage of a converter V1, V2. A voltage limitation circuit R8, R3, D5, R4, R5, C3, SD is connected in parallel with the intermediate circuit capacitor C6. A dissipation element R8in the voltage limitation circuit R8, R3, D5, R4, R5, C3, SD converts electrical energy into thermal energy when a maximum value for the voltage across the intermediate circuit capacitor C6is exceeded. The current through the measuring resistor R3is measured as the voltage UC3across the measuring resistor R3, is detected in a delay circuit R4, R5, C3and is used to control a shutdown device SD for the converter V1, V2.

REFERENCES:
patent: 6650514 (2003-11-01), Schmitt
patent: 2004/0080283 (2004-04-01), Mayer et al.
patent: 2004/0130273 (2004-07-01), Alexandrov

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