Transmission duplex interface circuit suitable for compound impedance medium

A technology of interface circuit and output interface circuit, which is applied in gearbox hybrid circuit, telephone communication, electrical components, etc., can solve the problems of line impedance change and bridge-type side tone cancellation technology that cannot be popularized and used.

Active Publication Date: 2009-11-25
STATE GRID ELECTRIC POWER RES INST +2
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  • Abstract
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Problems solved by technology

Bridge-type sidetone cancellation technology requires good impedance matching. However, in power line communication, the line impedance changes, especially in a wide frequency ban

Method used

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  • Transmission duplex interface circuit suitable for compound impedance medium
  • Transmission duplex interface circuit suitable for compound impedance medium
  • Transmission duplex interface circuit suitable for compound impedance medium

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Embodiment 1

[0019] Such as figure 2 As shown, one of the specific cases of the implementation of a transceiver duplex interface circuit suitable for complex impedance media is characterized in that: the transceiver duplex interface circuit is composed of three transformers, and the impedance matching network consists of an impedance transformation transformer 7 (n1: n2), the balance network 11 is composed of an impedance (75 ohms), and the cancellation network is composed of a transformer 8 (n3:n4) and a transformer 10 (n5:n6). The power signal of the output amplifier 1 is connected to the source stage of the impedance transformation transformer 7 (n1:n2), and the secondary stage of the impedance transformer 7 is connected to the source stage of the transformer 8, and the transformation ratio of the transformer 8 is 1:1. The other path of the secondary side of the impedance converter 7 is connected to the source stage of the transformer 10 and the output interface circuit 12 through the ...

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PUM

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Abstract

The invention discloses a transmission duplex interface circuit suitable for a compound impedance medium, comprising an output power amplifier (1), an impedance matching network module, a balance network module, a cancellation network module, an output interface circuit and an input power amplifier (6). The transmission duplex interface circuit suitable for the compound impedance medium is characterized in that the impedance matching network module comprises a transformer, and the cancellation network module comprises two butted transformers. The transmission duplex interface circuit is particularly suitable for application to transmission media with extremely complicated load impedance characteristics and variance, can realize cancellation in a wideband range and overcomes the defects ofa bridge-type anti-sidetone technology.

Description

technical field [0001] The invention relates to an interface circuit, in particular to a transceiver duplex interface circuit suitable for composite impedance media. Background technique [0002] Medium and low-voltage power line carrier communication technology uses the power supply network to transmit data with power cables or overhead line resources. Since it uses power lines for data transmission, it uses a shared medium (power line) communication technology, and its communication method often adopts time division. Or in the frequency division mode, the power signal is sent to the medium (power line), and the remote carrier signal is received from the medium (power line) is the same interface circuit. In order to be able to send high-power carrier signal to the power line, the communication device needs to send To suppress the signal from the high-power signal string to the receiving end of the machine, it is usually necessary to use the transceiver cancellation technolo...

Claims

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Application Information

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IPC IPC(8): H04M3/00H04B3/03
Inventor 汪晓岩易浩勇汤煜明李国春蔡世龙
Owner STATE GRID ELECTRIC POWER RES INST
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