Electric apparatus comprising a shield and transmission means with filtering of an electric signal on both sides of the shield
AssigneeKoninklijke Philips Electronics N.V.
InventorBernard Delvart
Life of this patent
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Abstract
The invention relate to an electric apparatus which comprises a metallic housing formed by at least a part containing a switched-mode power supply, one part containing an amplifier and a shield separating these two parts. Openings are provided in the shield for transmitting signals from the first to the second part by filtering them. For this purpose, a filter device is provided. This device is formed by a print circuit which has at least an input/output, comprises a surface-mounted capacitor, a ground plane and a connection mechanism for connecting ground to the shield.
Claims20
An electric apparatus comprising a housing formed by at least a first part containing a switched-mode power supply, a second part containing a processing circuit and a shield for isolating said first and second parts, said shield having at least an opening at which a filter device is installed, said filter device is formed on a printed circuit which includes:
- connection means for receiving a plurality of signals coming from said first part and for delivering a filtered version of said signals to said second part, wherein said connection means provides separate connectors for each of said plurality of signals,
- at least one ground plane,
- at least a capacitor of the surface-mounted type provided for each of said signals arranged between said connection means and said ground plane,
- means for connecting said ground plane to said shield.
An electric apparatus having a housing formed by at least a first part containing a power supply that provides a plurality of voltages, a second part containing a processing circuit and a shield that isolates said first part from said second part, said shield having at least one opening with a filter device installed, wherein said filter device comprises:
- a circuit board located at said opening, said circuit board having a plurality of connectors with at least one of said connectors connected to each of said voltages;
- a plurality of filter channels formed on said circuit board such that there is at least one filter channel for each of said connectors, each of said filter channels having at least one capacitor operatively connected to one of said voltages and a ground plane;
- and
- an output to each of said connection mechanisms, wherein each of said outputs provides one of said voltages to said second part;
- whereby, said second part is provided with a filtered version of each of said voltages.
Dependencies are inferred from the claim text.