Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-01-29
1998-05-26
Sterrett, Jeffrey L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 40, 363 97, H02M 3335
Patent
active
057576289
ABSTRACT:
An improved switching power unit is of the type which uses a capacitor C1 of large capacitance value as a primary DC power supply, inputs primary DC power from the capacitor C1 to a series circuit formed of the primary winding N1 of a high-frequency transformer 6 and a switching element Q, induces AC power in the secondary winding N2 of the transformer 6 by switching the switching element Q, and rectifies and smooths the AC power to produce and output DC power. In the improved switching power unit, an inductor L1 and/or inductor L2 of small inductance value are/is connected in series with the capacitor C1 of large capacitance value for smoothing the primary DC power, a bypass capacitor Cp is connected in parallel with a series circuit formed of the primary winding N1 of the high-frequency transformer 6 and the switching element Q, thereby bypassing high-frequency noise caused by switching and preventing it from passing through the capacitor C1, and a series circuit formed of a grounding resistor Rg and a grounding capacitor Cg is connected between frame ground G and a hot line 4p or a common line 4n. As a result, the operation of a switching circuit 11 of the switching power unit is stabilized, while electromagnetic interference noise is markedly suppressed since high-frequency noise leaking to frame ground G is converted to heat by the resistor Rg.
REFERENCES:
patent: 4943886 (1990-07-01), Quazi
patent: 5323303 (1994-06-01), Dolland
patent: 5331534 (1994-07-01), Suzuki et al.
patent: 5408402 (1995-04-01), Nonnenmacher
patent: 5498936 (1996-03-01), Smith
Sterrett Jeffrey L.
Tohoku Ricoh Co. Ltd.
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