EP 0244644 B1 19910410 - CIRCUIT ARRANGEMENT FOR THE HIGH-FREQUENCY OPERATION OF LOW-PRESSURE DISCHARGE LAMPS
Title (en)
CIRCUIT ARRANGEMENT FOR THE HIGH-FREQUENCY OPERATION OF LOW-PRESSURE DISCHARGE LAMPS
Publication
Application
Priority
DE 3611611 A 19860407
Abstract (en)
[origin: US4782268A] To suppress introduction of harmonics into the power supply network of a high-frequency operated fluorescent lamp, an input capacitor (C2) connected across a direct current supply (P1, P2) for a transistor push-pull high-frequency circuit-operating at between 25-50 kHz-has a pair of serially connected diodes (D4, D5) connected thereto. The junction point (M2) of the diodes is connected via a coupling capacity (C7) to a common junction (M1) of the push-pull connected transistors (T1, T2). The power line circuit has a line choke (L2, L2') connected, either in advance or behind a rectifier (G1) supplying direct current to the transistor push-pull circuit. The circuit effectively suppresses harmonics, particularly the third harmonic, without introducing additional losses in the circuit, especially if a further capacitor (C8) is connected in the resonance circuit of the fluorescent lamp and to the diode junction (M2) between the two diodes (D4, D5).
IPC 1-7
IPC 8 full level
H05B 41/24 (2006.01); H05B 41/28 (2006.01)
CPC (source: EP US)
H05B 41/28 (2013.01 - EP US); Y10S 315/02 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DE 3611611 A1 19871008; DE 3769196 D1 19910516; EP 0244644 A1 19871111; EP 0244644 B1 19910410; JP S62243293 A 19871023; US 4782268 A 19881101
DOCDB simple family (application)
DE 3611611 A 19860407; DE 3769196 T 19870403; EP 87104991 A 19870403; JP 8396187 A 19870407; US 2348187 A 19870309