Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1997-07-31
1999-06-29
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 37, 363 39, 315291, 315307, H02J 300, H02M 545, G05F 100
Patent
active
059177179
ABSTRACT:
A circuit arrangement for the high-frequency operation of a discharge lamp comprises a first rectifying circuit (D1-D4) for generating a DC voltage across a first capacitor (C1) from a low-frequency supply voltage. A DC/AC converter (IV) for generating a high-frequency AC voltage at a frequency f from the DC voltage is coupled to a load branch (B) provided with coupling means (T3, T4) for coupling the discharge lamp (Li) to the load branch. The load branch connects a junction point N1 of the DC/AC converter to a junction point N2 between the first rectifying circuit and the first capacitor. A second rectifying circuit for converting a high-frequency voltage generated by the DC/AC converter into a DC voltage is coupled to the first capacitor and to a junction point N3 in the load branch. A control circuit controls the power consumed by the discharge lamp through variation of the frequency f. The coupling means are connected between the junction point N2 and the junction point N3 in the load branch.
REFERENCES:
patent: 5134556 (1992-07-01), De Mere
patent: 5404082 (1995-04-01), Hernandez et al.
patent: 5525872 (1996-06-01), Achten et al.
patent: 5757143 (1998-05-01), Martucci et al.
Aendekerk Everaard M. J.
Arts Paulus P. B.
Gradzki Pawel M.
Hendrix Machiel A. M.
Janczak Jerzy
Franzblau Bernard
Patel Rajnikant B.
U.S. Philips Corporation
Wong Peter S.
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