Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1997-03-26
1998-10-06
Hecker, Stuart N.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 45, H02M 112, H02M 114
Patent
active
058187057
ABSTRACT:
An internal AC adapter which incorporates a space efficient EMI filter is positioned within a main chassis portion of a portable personal computer having at least one energy-demanding component also positioned within the main chassis portion. The internal AC adapter, which converts alternating current received from an alternating current main to direct current for transmission to the energy-demanding components, includes a first connector for electrically connecting the internal AC adapter to the alternating current main, a bridge rectifier circuit having an AC input side electrically connected to the first connector and a DC output side and a space efficient electromagnetic interference filter having an input side electrically connected to the DC output side of the bridge rectifier circuit and an output side. The bridge rectifier circuit converts alternating current received from the first connector to direct current for transmission to the electromagnetic interference filter. In turn, the electromagnetic interference filter includes at least one capacitative element for filtering noise from the direct current transmitted thereto by the bridge rectifier circuit. The filtered direct current is then transmitted to the energy-demanding components electrically connected to the output side of the electromagnetic interference filter. By placing the electromagnetic interference filter on the DC output side of the bridge rectifier circuit, reduced size capacitors such as a multilayer ceramic capacitor may be used as the capacitative element.
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patent: 5636112 (1997-06-01), Faulk
Compaq Computer Corporation
Hecker Stuart N.
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