Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
1999-08-23
2001-06-12
Wu, Daniel J. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S657000, C340S693700, C206S527000, C206S719000, C379S437000, C379S440000
Reexamination Certificate
active
06246324
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to mains interface modules.
DESCRIPTION OF THE RELATED ART
Mobile cellular telecommunications base stations which operate in extremes of temeperature typically include suitable heating and/or cooling equipment. The heating and/or cooling equipment is used to maintain suitable operating temperatures for the equipment of the base station.
However, the heating and/or cooling equipment requires a power supply in order to maintain the suitable operating temperatures for the equipment of the base station. Power supplies generate electromagnetic interference (EMI). EMI can potentially disrupt the normal operation of the equipment of the base station by inducing unwanted voltages in their electronic circuits.
SUMMARY OF THE INVENTION
In accordance with the invention there is provided a mains interface module for a screened enclosure containing electronic equipment, the interface module comprising a screened casing having a weather proof mains inlet connector; one or more mains outlets and containing EMI filters operative to protect the outlet(s) from interference from a mains supply when connected to the inlet connector. The screening prevents radiation of interference within the enclosure. The weather proof mains inlet allows the equipment to be used and installed outside. The EMI filters prevent interference from being conducted through the outlets.
In one application to mobile cellular telecommunication base stations which are required to operate in extremes of temperature, it is necessary to provide heating which is controlled by a thermostat. In a preferred form the interface module includes at least two mains outlets one controlled by a thermostat internal to the interface for connection to a heater. Conventionally, a thermostat would be placed with the heater it controls.
The or each mains outlet may include a manually operated switch.
A fuse may be provided to protect all outlets.
A mains voltage detector may be provided with an indicator, responsive to the detector, to indicate presence of mains voltage.
An indicator may be provided responsive to an input from a unit powered by said interface module by which a fault diagnosed by the powered unit may be indicated.
REFERENCES:
patent: 4851609 (1989-07-01), Reddy
patent: 4930047 (1990-05-01), Peterson
patent: 5309315 (1994-05-01), Naedel et al.
patent: 5340944 (1994-08-01), Wang
patent: 5548643 (1996-08-01), Dalgleish et al.
patent: 5801632 (1998-09-01), Opal
patent: WO 96/36093 (1996-11-01), None
Messenger Michael Peter
O'Connell Terry Patrick
Lucent Technologies - Inc.
Wu Daniel J.
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