Low-pressure discharge lamp, particularly fluorescent lamp high-

Details Low-pressure discharge lamp, particularly fluorescent lamp high- Low-pressure discharge lamp, particularly fluorescent lamp high-

1987-03-09

1988-11-01

Moore, David K.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315244, 315209R, 315224, 315DIG2, H05B 3700

Patent

active

047822686

ABSTRACT:
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).

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Sipmos Transistors, Siemens Application Notes 1983, chapter 1.9, "Electro Ballast for Fluorescent Lamps", p. 34, et seq.
Elektronik-Schaltungen (Electronic Circuits) by Waltr Hirschmann publish by Siemens AG, chapter B3.12.
International Electrotechnical Commission Publication 82, p. 47-49, Funk-Enstorung von Elektrischen, DIN 57 875, Teil 2-pp. 1-6.

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