CN202395851U

CN202395851U - Very-high-bit-rate digital subscriber loop (VDSL) local voice splitter unit circuit with protective structure

Info

Publication number: CN202395851U
Application number: CN2011205030221U
Authority: CN
Inventors: 徐浩; 李俊
Original assignee: SHENZHEN TORCH EQUIPMENT CO Ltd
Current assignee: Shenzhen Technology Co., Ltd.
Priority date: 2011-12-07
Filing date: 2011-12-07
Publication date: 2012-08-22
Anticipated expiration: 2021-12-07

Abstract

The utility model discloses a very-high-bit-rate digital subscriber loop (VDSL) local voice splitter unit circuit with a protective structure. The unit circuit comprises a first-order inductor, a semiconductor discharge tube and an LC filter circuit, wherein the semiconductor discharge tube is connected in parallel after the first-order inductor and before the LC filter circuit; and the first-order inductor has a double-slot structure, and two windings are spaced by a framework. According to the voice splitter unit circuit, the semiconductor discharge tube is placed after the first-order inductor of a splitter, and the first-order inductor has the double-slot structure, so the turn-to-turn capacitance is low; the two windings are spaced by the framework, so the unit circuit has high voltage withstanding strength; and due to the isolating action of the first-order inductor, the cost is reduced, and the aim of accurate protection is fulfilled.

Description

A kind of VDSL local side Splitter element circuit of safeguard structure

Technical field

The utility model relates to a kind of Splitter element circuit, especially a kind of VDSL local side Splitter element circuit with overcurrent-overvoltage protecting circuit structure.

Background technology

ADSL (Asymmetric Digital Subscriber Line, ADSL) is a kind of new data transfer mode, and therefore it be called the ADSL loop because uplink and downlink bandwidth is asymmetric.It adopts frequency multiplexing technique to be divided into phone, three relatively independent channels of uplink and downlink to common telephone wire, thereby has avoided interference each other, even the situation that speed of surfing the Internet and speech quality descend can not take place yet in the online while making a phone call.

VDSL (Very-high-bit-rate Digital Subscriber loop) high-speed digital subscriber line, briefly, VDSL is exactly the quick version of ADSL.Use VDSL, pass speed under the maximum in the short distance and can reach 55Mbps, uploading rate can reach 19.2Mbps, even higher.

Splitter with the low-frequency audio signal on the circuit (300～3400Hz) with the transmission data high-frequency digital modulation signal (20KHz～4.4MHz/12MHz) effectively separate; Then audio signal is sent into PSTN (Public Switched Telephone Network) switch or POTS (Plain Old Telephone Service) telephone set, facsimile machine etc., the high-frequency digital modulation signal is sent into DSLAM (DSL Access Multiplexer)/DSL MODEM modulator-demodulator.

The existing voice separator all is the multi-stage filter circuit that is made up of the passive device of inductance, electric capacity and resistance; Present employed circuit; For the VDSL separator, general way is to use gas discharge tube to be placed on the front of the separator first rank inductance, with all circuit after the protection discharge tube.But the gas discharge tube cost is high, and the cut-in voltage scope is very wide, and discreteness is big; The long-term problem that also has gas leakage of using; If the use semiconductor discharge tube, relative cost is low, and the cut-in voltage discreteness is little; But the junction capacitance of semiconductor discharge tube is very big, can not satisfy the index request of product during to frequency applications.

The utility model content

The utility model promptly is the above-mentioned defective that exists to overvoltage crowbar in the present separator, designs a kind of VDSL local side Splitter element circuit with new protection structure.

The mentality of designing of the utility model is the back that semiconductor discharge tube is placed on the separator first rank inductance, and the first rank inductance adopts dual-slot structure, and turn-to-turn capacitance is little, has skeleton to separate between two windings, and very high compressive resistance is arranged.Because of the buffer action of the first rank inductance is arranged, the junction capacitance of semiconductor discharge tube just can not done to have considered.The reduction of cost and the purpose of accurately protecting have been realized.

Solid discharging tube is called semiconductor discharge tube again, is a kind of anti-thunderbolt device in the communications field, is the renewal product of gas discharge tube, piezo-resistance.When adding lightning induced voltage when rising to its puncture voltage, semiconductor discharge tube is the circular motion of avalanche transistor, can flow through very big surge current or pulse current.The scope of its puncture voltage has constituted the scope of overvoltage protection, and semiconductor discharge tube can directly be connected across by the protective circuit two ends when using.

Specifically; The VDSL local side Splitter element circuit of the described safeguard structure of the utility model; It is characterized in that: described element circuit comprises the first rank inductance, semiconductor discharge tube and LC filter circuit; Wherein, semiconductor discharge tube is connected in parallel on after the first rank inductance, before the LC filter circuit.

The VDSL local side Splitter element circuit of described safeguard structure, wherein, the first rank inductance adopts dual-slot structure, has skeleton to separate between two windings.

The VDSL local side Splitter element circuit of described safeguard structure, wherein, described LC filter circuit comprises the double flute inductance that has skeleton to separate between winding, electric capacity of each parallel connection of the two ends of double flute inductance, each winding is also respectively parallelly connected with an electric capacity.

The capacitor of parallel connection to the capacitor charging, can be stored in portion of energy in the capacitor when input voltage raises; And when input voltage reduced, the discharge of electric capacity two ends just can discharge the energy of storage.To load discharge, the output voltage that obtains in the load is just smoother, has played the effect of flat ripple through filter circuit.If adopt inductor filter, when input voltage increased, with the electric current increase in the inductance that load connect, so inductance when electric current reduces, discharged the storage area magnetic field energy again with energy, load current is become smoothly, so inductance also has flat ripple effect.

The VDSL local side Splitter element circuit of the described safeguard structure of the utility model, because of the buffer action of the first rank inductance is arranged, the junction capacitance of semiconductor discharge tube just can not done to have considered, has realized the reduction of cost and the purpose of accurately protecting.

Description of drawings

Fig. 1 is the circuit block diagram of existing separator protective circuit;

Fig. 2 is the circuit diagram of the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing the VDSL local side Splitter element circuit of the described safeguard structure of the utility model is described; Purpose is better to understand the described technology contents of the utility model for the public; Rather than to the restriction of said technology contents, in fact, with the said identical or approximate principle of the utility model; The improvement that element circuit is done is all within the utility model technical scheme required for protection.

Like Fig. 1, present employed circuit is for the VDSL separator; General way is to use gas discharge tube (GDT) to be placed on the front of the separator first rank inductance, and with all circuit after the protection discharge tube, but the gas discharge tube cost is high; The cut-in voltage scope is very wide, and discreteness is big, the long-term problem that also has gas leakage of using; If the use semiconductor discharge tube, relative cost is low, and the cut-in voltage discreteness is little; But the junction capacitance of semiconductor discharge tube is very big, can not satisfy the index request of product during to frequency applications.

Wherein, LPF is the abbreviation of " Low Pass Filter ", means " low pass filter ", is to let low frequency signal pass through, and stops high-frequency signal to pass through.Low pass filter generally is used for removing the unnecessary radio-frequency component of input signal, removes High-frequency Interference.

The described protective circuit of the utility model; As shown in Figure 2; Described element circuit comprises the first rank inductance L 1, semiconductor discharge tube (TSS, Thyristor Surge Suppressors) and LC filter circuit, wherein; Semiconductor discharge tube is connected in parallel on after the first rank inductance L 1, before the LC filter circuit.

The VDSL local side Splitter element circuit of described safeguard structure, wherein, the first rank inductance adopts dual-slot structure, has skeleton to separate between two windings; Described LC filter circuit comprises the double flute inductance L 2 that has skeleton to separate between winding, and the two ends of double flute inductance capacitor C 1 of each parallel connection and C2, each winding are also respectively parallelly connected with C4 with a capacitor C 3.

Described Splitter element circuit is placed on semiconductor discharge tube the back of the separator first rank inductance; The first rank inductance adopts dual-slot structure; Turn-to-turn capacitance is little, has skeleton to separate between two windings, and very high compressive resistance is arranged; Because of the buffer action of the first rank inductance is arranged, the reduction of cost and the purpose of accurately protecting have been realized.

Claims

1. the VDSL local side Splitter element circuit of a safeguard structure; It is characterized in that: described element circuit comprises the first rank inductance, semiconductor discharge tube and LC filter circuit; Wherein, semiconductor discharge tube is connected in parallel on after the first rank inductance, before the LC filter circuit.

2. the VDSL local side Splitter element circuit of safeguard structure according to claim 1 is characterized in that: the first rank inductance adopts dual-slot structure, has skeleton to separate between two windings.

3. the VDSL local side Splitter element circuit of safeguard structure according to claim 1 and 2; It is characterized in that: described LC filter circuit comprises the double flute inductance that has skeleton to separate between winding; Electric capacity of each parallel connection of the two ends of double flute inductance, each winding is also respectively parallelly connected with an electric capacity.