Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1996-04-02
1997-09-30
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 21, H02M 3335
Patent
active
056731850
ABSTRACT:
A circuit arrangement for generating at least a DC output voltage (at 18, 19) from an at least substantially sine-shaped AC input voltage (at 2, 3) of a first frequency by a first rectifier arrangement (1) to which the AC input voltage can be applied (at 2, 3) and which has a DC output (4, 5) from which a rectified voltage is obtainable, a first inductance (6), a second rectifier arrangement (7) and a first filter capacitance (8) which, in this order, constitute a series arrangement connected parallel to the DC output (4, 5), a switched-mode power supply (9) having two input terminals (10, 11) with which it is arranged parallel to the first filter capacitance (8) and between which it includes a series arrangement of a second inductance (12) and a switching device (13) which is alternately switchable in the conducting state and in the blocked state at a second frequency and from which the DC output voltage(s) is (are) obtainable (at 18, 19), as well as a first control capacitance (23) by which the junction point (22) between the first inductance (6) and the second rectifier arrangement (7) is combined with the junction point (24) between the second inductance (12) and the switching device (13), as well as the series arrangement of a second control capacitance (28) and a second switching device (29) which is arranged parallel to the first control capacitance (23) between the junction points (22) and (24), the first inductance (6) and the first control capacitance (23) being dimensioned in such a way that a resonance frequency determined thereby is larger than the second frequency and the last-mentioned frequency is chosen to be large with respect to the first frequency, while the second control capacitance (28) is chosen to be large with respect to the first control capacitance (23). While using a small number of components, both the voltage rise at the switching device and thus the high-frequency interference originating therefrom can be reduced under all occurring circumstances, and the harmonics of the line current can also be reduced. Moreover, the maximum voltage occurring at the switching elements may be limited to a predetermined value without any additional losses.
REFERENCES:
patent: 4641229 (1987-02-01), Easter
patent: 4712169 (1987-12-01), Albach
patent: 5115185 (1992-05-01), Fraidlin et al.
Albach Manfred
Durbaum Thomas
Goodman Edward W.
Han Y. J.
U.S. Philips Corporation
Wong Peter S.
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