CN109361831A

CN109361831A - High-precision multi-band electronically controlled equalization circuit

Info

Publication number: CN109361831A
Application number: CN201811283927.5A
Authority: CN
Inventors: 谭人豪; 黄起坤; 李魏
Original assignee: Global Technology Inc China
Current assignee: Global Technology Inc China
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2019-02-19

Abstract

The present invention relates to cable TV network product technical fields, more particularly to a kind of automatically controlled equalizing circuit of high-precision multiband, it includes single-chip microcontroller and balance module, the balance module and monolithic mechatronics, it further includes frequency band switching module, the frequency band switching module is electrically connected with single-chip microcontroller and balance module respectively, in which: balance module has the function of changing waveform slope；Frequency band switching module has the function of changing different frequency bands；Single-chip microcontroller has the function of controlling balance module and frequency band switching module.This equalizing circuit is able to achieve frequency band switching and maintenance cost is lower.

Description

The automatically controlled equalizing circuit of high-precision multiband

Technical field

The present invention relates to the automatically controlled balanced electricity of cable TV network product technical field more particularly to a kind of high-precision multiband Road.

Background technique

CATV signal will cause loss in the transmission of cable/optical fiber in cable TV network.Wherein cable/optical fiber Attenuation characteristic increases with the raising of frequency, and on the other hand, the decaying of signal increases with the increase of cable/fiber distance.Cause This transmission cable/optical fiber to different distance, transmission signal can generate different decaying and slope, and depreciation needs to use Different Slope The loss of the equalizing signal of value, balancing band inner curve enable signals to stablize, good, remote transmission.On-line Product liter Upstream band can be changed accordingly with demand when grade, and the frequency band of equalizing circuit is also required to be changed accordingly.

Carry out thermal compensation signal amplitude using equalizing circuit in upstream amplifier and node.The equilibrium electricity being commonly used Road is automatically controlled equalizing circuit, can carry out the change of slope, to signal by remotely-or locally controlling to reach compensation Purpose.But the equalizing circuit of the prior art cannot achieve the variation of multiband when On-line Product frequency band upgrades, as Fig. 1 with Shown in Fig. 2, it can only be realized by replacement frequency-selecting module.And plug-in module volume is larger and brings heat dissipation, plug mistake therewith The problems such as effect, wasting manpower and material resources, the working service in product later period is seriously affected, maintenance cost is increased.

Summary of the invention

The technical problems to be solved by the present invention are: providing, one kind being able to achieve frequency band switching and maintenance cost is lower high-precision Spend the automatically controlled equalizing circuit of multiband.

The technical scheme adopted by the invention is that: a kind of automatically controlled equalizing circuit of high-precision multiband, it include single-chip microcontroller with And balance module, the balance module and monolithic mechatronics, it is characterised in that: it further includes frequency band switching module, the frequency Band switching module is electrically connected with single-chip microcontroller and balance module respectively, in which: balance module has the function for changing waveform slope Energy；Frequency band switching module has the function of changing different frequency bands；There is single-chip microcontroller control balance module and frequency band to switch mould The function of block.

Using the above structure compared with prior art, the invention has the following advantages that frequency can be controlled by single-chip microcontroller Band switching module, and then realize the switching of frequency band, and do not need plug frequency-selecting module, maintenance cost is lower.

Preferably, the frequency band switching module includes multiple frequency-selecting modules and for switching cutting for multiple frequency-selecting modules Change the mold block, and the switching module is electrically connected with single-chip microcontroller and balance module respectively, and the multiple frequency-selecting module with cut Change the mold block electrical connection.Switched between multiple frequency-selecting modules by switching module, control in this way is got up more convenient.

Preferably, the switching module includes single pole multiple throw chip.Switched using single pole multiple throw chip Frequency-selecting module switches in this way and comes more convenient, and cost is relatively low.

The frequency-selecting module includes LC series circuit, and LC series circuit both ends have also been arranged in series blocking electricity respectively Hold.Because be provided with switching module and multiple frequency-selecting modules, interference is more, and be provided with capacitance can play compared with Good anti-jamming effectiveness.

Preferably, the frequency-selecting module includes LC oscillating circuit, and the LC oscillating circuit is also gone here and there far from ground connection one end Connection is provided with capacitance.Because being provided with switching module and multiple frequency-selecting modules, interference is more, and is provided with blocking Capacitor can play preferable anti-jamming effectiveness.

Detailed description of the invention

Fig. 1 is the module frame chart of prior art equalizing circuit.

Fig. 2 is the circuit diagram of prior art equilibrium electric power.

Fig. 3 is the module frame chart of the automatically controlled equalizing circuit of high-precision multiband of the present invention.

Fig. 4 is the circuit diagram of the automatically controlled equalizing circuit of high-precision multiband of the present invention.

Fig. 5 is the enlarged drawing of upper portion in Fig. 4.

Fig. 6 is the enlarged drawing of lower portion in Fig. 4.

Specific embodiment

The present invention is described further below in conjunction with attached drawing and specific embodiment, but the present invention be not limited only to it is following Specific embodiment.

As shown in Figure 1 be the equalizing circuit of the prior art, i.e. its only one frequency-selecting module, as L51, C59 in Fig. 2 this A pair of of LC series circuit and C56, L62 this pair of LC oscillating circuit, this frequency-selecting module determine the frequency of automatically controlled equalizing circuit The characteristics such as rate cut-point and flatness.

The application specific embodiment as shown in figure 3, a kind of automatically controlled equalizing circuit of high-precision multiband, it include single-chip microcontroller, Balance module and frequency band switching module, the balance module and monolithic mechatronics, the frequency band switching module respectively with list Piece machine and balance module electrical connection, in which:

Balance module has the function of changing waveform slope, as shown in Figure 2 and Figure 4, identical as the balance module of the prior art.

Frequency band switching module has the function of changing different frequency bands, mainly including multiple frequency-selecting modules and for switching The switching module of multiple frequency-selecting modules, and the switching module is electrically connected with single-chip microcontroller and balance module respectively, and described more A frequency-selecting module is electrically connected with switching module.Wherein switching module selects single pole multiple throw chip, in this specific embodiment Middle selection hilted broadsword four-throw switch chip, as shown in Figure 4.Then as shown in figure 5, between the input and output of balance module chip Two hilted broadsword four-throw switch chips are set, and are provided with four road LC series circuits between two hilted broadsword four-throw switch chips, and And every road LC series circuit both ends are provided with capacitance, such single-chip microcontroller can be by controlling the two four throw switches of hilted broadsword Chip selects different LC series circuits.As shown in fig. 6, being set before ground connection between equalizing circuit chip and coupling circuit It is equipped with a hilted broadsword four-throw switch chip, and this hilted broadsword four-throw switch chip is grounded by four LC oscillating circuits, and One capacitance of series connection, such single-chip microcontroller can pass through before each LC oscillating circuit is connect with hilted broadsword four-throw switch chip This hilted broadsword four-throw switch chip is controlled to select different LC oscillating circuits.I.e. single-chip microcontroller can control three hilted broadsword four-throws and open Chip is closed to select different LC series circuits and different LC oscillating circuits, realizes frequency-selecting function.

Single-chip microcontroller has the function of controlling balance module and frequency band switching module.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of skill in the art that it still can be right Technical solution documented by previous embodiment is modified, or is replaced on an equal basis to part of technical characteristic；And these It modifies or replaces, the essence of corresponding technical solution is not made to be detached from the spirit and model of technical solution of various embodiments of the present invention It encloses.

Claims

1. a high-precision multi-band electronically controlled equalization circuit, it comprises a single-chip microcomputer and an equalization module, the equalization module is electrically connected with the single-chip microcomputer, and it is characterized in that: it also includes a frequency band switching module, and the frequency band switching module is respectively with the single-chip microcomputer and the equalization module. The modules are electrically connected, where:

Equalization module, with the function of changing the waveform slope;

The frequency band switching module has the function of changing different frequency bands;

The single-chip microcomputer has the functions of controlling the equalization module and the frequency band switching module.

2 . The high-precision multi-band electronically controlled equalization circuit according to claim 1 , wherein the frequency band switching module comprises a plurality of frequency selection modules and a switching module for switching a plurality of frequency selection modules, and the switching The modules are respectively electrically connected to the single chip microcomputer and the equalization module, and the plurality of frequency selection modules are all electrically connected to the switching module.

3 . The high-precision multi-band electronically controlled equalization circuit according to claim 2 , wherein the switching module comprises a single-pole multi-throw switch chip. 4 .

4 . The high-precision multi-band electronically controlled equalization circuit according to claim 2 , wherein the frequency selection module comprises an LC series circuit, and two ends of the LC series circuit are respectively provided with DC blocking capacitors in series. 5 .

5 . The high-precision multi-band electronically controlled equalization circuit according to claim 2 , wherein the frequency selection module comprises an LC oscillating circuit, and one end of the LC oscillating circuit away from the ground is also provided with a DC blocking capacitor in series. 6 .