EPCOS has succeeded in integrating a filter choke and two PTC thermistors for surge-current protection in a single component, the Transformer Protection (TP) module for DSL systems. A combination of the newly developed rectangular PTC and a modified standard filter choke permits both functional units to be stacked on top of each other, thus halving the space requirement compared with the discrete solution. Some 100 mm² are saved for each TP module, which corresponds to 72 cm² for the new line cards with 72 lines.
The filter choke with its symmetrical design and electrical properties is matched exactly to the requirements of the GEMINAX chip set from Infineon Technologies. Modifying the geometry of the transformer enabled a reduction of the DC resistance of the coil by 20 percent, thus significantly improving the DC bias behavior of the entire system.
The TP module satisfies the requirements of ITU-T, K20, K21, K45 and the British Telecom Standards.
About EPCOS
EPCOS AG, a manufacturer of passive electronic components headquartered in Munich, is market leader in Europe and number two worldwide. With its uniquely broad portfolio EPCOS offers a comprehensive range of products from a single source. The EPCOS Group has design, manufacturing and marketing facilities in Europe, the Americas and Asia.
Passive electronic components are found in every electrical and electronic product – from automotive and industrial electronics through information and communications to consumer electronics. Components from EPCOS store electrical energy, select frequencies, and protect against overvoltage and overcurrent.
In fiscal 2005 (October 1, 2004, to September 30, 2005), EPCOS posted sales of EUR 1.24 billion. At September 30, 2005, the company employed about 16,100 people worldwide.
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