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Power line communication device with filter

A power line communication and filter technology, which is applied in the distribution line transmission system, electrical components, wired transmission system, etc., can solve the problems of increasing the number of components and rising costs, and achieve the effect of suppressing the increase in the number of components and good characteristics

Inactive Publication Date: 2007-06-06
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] However, using the above-mentioned balanced filter, in order to achieve better characteristics near the pass band and the cut-off band in the high frequency range, the number of poles (poles) must be increased. Issues related to increase and cost increase
In addition, since the power supply ripple noise around 50 Hz or 60 Hz from the commercial power supply 1 is input to the power lines 2a and 2b, it is desired to maintain the cut-off characteristics even in such a low frequency band, but the number of components will further increase

Method used

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  • Power line communication device with filter
  • Power line communication device with filter
  • Power line communication device with filter

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Embodiment Construction

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0024] FIG. 1 is a configuration diagram of a power line communication device according to an embodiment of the present invention, mainly showing a filter circuit portion. In addition, the same parts as those of the balanced filter shown in FIG. 4 are assigned the same symbols. That is, the power supply side of the balanced filter 3 is connected to the secondary side of the signal superimposing transformer 20 via the DC blocking capacitors 13, 14 and the protective diodes 19a, 19b respectively provided on the power lines 2a, 2b. The primary side of the transformer 20 is connected to the commercial power supply 1 . Also, the modem sides of the unbalanced filters 21 and 22 provided on the modem side of the balanced filter 3 are connected to the PLC modem 4 via DC blocking capacitors 15 and 16 respectively provided on the power lines 2a and 2b.

[0025] The pow...

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Abstract

The present invention provides a power line communication device with filter. A filter circuit in a power line communication device is composed of the balanced filter 3 connected to two power lines 2a, 2b in a power line and allowing a prescribed band to pass through, a first imbalanced filter 21 provided between one power line 2a and ground and cutting signals in bands other than the prescribed band, and a second imbalanced filter 22 provided between the other power line 2b and the ground and cutting signals in the bands other than the prescribed band. Thereby it achieves further excellent characteristics near a passband and in a high-pass stopband while suppressing increase of the number of components due to increase of the number of poles of a balanced filter.

Description

technical field [0001] The present invention relates to a power line communication device using a power line as a signal transmission channel, and more particularly to a power line communication device equipped with a filter for suppressing unnecessary radiation. Background technique [0002] In recent years, power line communication (PLC: Power Line Communication) that can realize data communication of several Mbps to hundreds of Mbps by installing a communication adapter (PLC modem) on an electric socket (consent) and connecting a data communication device such as a personal computer has been proposed. Communication). Since most buildings are covered with electrical wiring, there is no need to re-lay cables, etc., and an internal communication network can be easily established. [0003] Since the fact that a high-frequency electric signal originally flows through the power line is not taken into consideration, a problem of electric wave leakage occurs. Therefore, it is c...

Claims

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Application Information

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IPC IPC(8): H04B3/54H04B3/21
Inventor 菅野猛
Owner ALPS ALPINE CO LTD
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