Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1995-05-24
1998-02-03
Pascal, Robert
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315209R, 315205, 363 44, 363 45, 363 50, 323908, H05B 4136
Patent
active
057148465
ABSTRACT:
To substantially reduce harmonic distortion and improve the power factor of n operating circuit for a fluorescent lamp, a smoothing circuit (G) is interposed between the outputs from a power rectifier (GL) and an inverter (WR) supplying the fluorescent lamp (L) with high-frequency energy. The smoothing circuit includes a two electrolytic capacitor (C1, C2)--three diode (D1, D2, D3) network, which is so connected, and the diodes so polarized that, during charging of the capacitors, a series circuit is established with one (D2) of the three diodes in series with the two capacitors. For discharge of the capacitors to supply the inverter when the rectified voltage is lower than the capacitor voltage, the two capacitors (C1, C2), through the other two diodes (D1, D3), are connected in parallel to supply the inverter. To substantially reduce harmonic distortion to less than about 30% and improve the power factor of the circuit to above 0.95, a parallel resistor-capacitor (RC) circuit is connected between two junctions (V1, V2) serially with the series connected diode (D2). The resistor (R1), in combination with the capacitors, reduces, and time-delays, inrush current upon charging of the capacitors (C1, C2). The capacitor (C3) connected in parallel to the resistor (R1) permits backflow of high-frequency current from the inverter to the electrolytic capacitors (C1, C2), thus preventing transfer back to the network supply.
REFERENCES:
patent: 4808887 (1989-02-01), Fahnrich et al.
patent: 5049788 (1991-09-01), Lee
patent: 5130610 (1992-07-01), Kakitani
patent: 5387847 (1995-02-01), Wood
Rasch Erhard
Statnic Eugen
Kinkead Arnold
Pascal Robert
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
LandOfFree
Minimum harmonic distortion operating circuit for at least one l does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Minimum harmonic distortion operating circuit for at least one l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Minimum harmonic distortion operating circuit for at least one l will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-665645