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Noise filter and plc modulator-demodulator using same

A noise filter, modulation and demodulation technology, applied in the direction of impedance network, electrical components, multi-terminal pair network, etc., can solve the problems of not being able to use signal transmission, hindering transmission, etc.

Inactive Publication Date: 2004-08-25
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing structure as described above, the normal noise (the noise between superimposed wires) is suppressed by the X capacitors 24, 26, 30 and the common choke coil 32, and the common mode noise is suppressed by the Y capacitors 27, 28 and the common mode choke coil 25, 31 suppression, when the signal is superimposed between the wires for transmission, the signal is attenuated by the X capacitors 24, 26, 30 and the Y capacitors 27, 28, and the ordinary choke coil 32 hinders the transmission, so it cannot be used for signal transmission

Method used

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  • Noise filter and plc modulator-demodulator using same
  • Noise filter and plc modulator-demodulator using same

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Embodiment Construction

[0014] figure 1 A noise filter of the present invention and a PLC modem to which the noise filter is applied are shown. The laminated transformer 2 connected to the industrial power supply 1 is used to superimpose the modulation and demodulation signal output by the modulation and demodulation circuit 3 on the industrial power supply, and a noise filter 4 is inserted between the laminated transformer 2 and the modulation and demodulation circuit 3 . An information processing device such as a personal computer (not shown) is connected to the modem circuit 3 . Moreover, the commercial power supply 1 is connected with a power supply circuit 5 that generates DC voltage, and the power supply circuit 5 provides circuit working voltage to the modulation and demodulation circuit 3 .

[0015] The noise filter 4 is composed of a balanced circuit, and includes two parallel tuned circuits 6 and 7 connected between wires, a four-terminal type common mode choke coil 8 inserted therebetwe...

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Abstract

The objective is to construct a noise filter which suppresses common mode noise and normal mode noise and can transmit a signal and further to construct a PLC modem excellent in a noise suppression characteristic by using the noise filter. This PLC modem has a common mode choke coil 8 consisting of two coils 8b and 8c wound around a magnetic core 8a and a magnetic core 8a, and capacitors 9 and 10 connected serially to the respective coils 8b and 8c, respectively. Serial tuning circuits 11 and 12 consisting of the coils 8b and 8c and the capacitors 9 and 10 are tuned to a prescribed frequency, parallel tuning circuits 6 and 7 for tuning to the prescribed frequency are respectively provided with at least one of the preceding stage side and the subsequent stage of the serial tuning circuits 11 and 12, and the parallel tuning circuits 6 and 7 are connected between the two serial tuning circuits 11 and 12.

Description

technical field [0001] The present invention relates to a noise filter for suppressing noise superimposed on lamp lines (industrial power lines) and the like and a PLC modem using the noise filter. Background technique [0002] Existing noise filters such as figure 2 shown. A noise filter 23 is connected on the load side between the commercial power supply 21 and the load 22 . An X capacitor 30 is connected to the commercial power supply 21 side, and a common mode choke coil 31 is also connected to the X capacitor 30 . One end of the common mode choke coil 31 and the power line on one side are connected to the noise filter 23 via the normal choke coil 32 . The other end of the common mode choke coil 31 and the power line on the other side are directly connected to the noise filter 23 . [0003] The noise filter 23 has an X capacitor 24 connected to one side of the common mode choke coil 25 and an X capacitor 26 connected to the other side, and two Y capacitors 27 and 28 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/09
Inventor 菅野猛
Owner ALPS ALPINE CO LTD
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