CN201563067U

CN201563067U - Power supply adapter matched with IP telephone set and VOIP access equipment

Info

Publication number: CN201563067U
Application number: CN 200920260038
Authority: CN
Inventors: 黄德斌; 王志波; 邓永坚; 郭小东
Original assignee: Shenzhen Gongjin Electronics Co Ltd
Priority date: 2009-11-03
Filing date: 2009-11-03
Publication date: 2010-08-25
Anticipated expiration: 2019-11-03

Abstract

The utility model relates to a power supply adapter matched with an IP telephone set and VOIP access equipment, which solves the technical problem that alternating current sound is generated in the IP telephone conversation process. The utility model has the technical scheme that the power supply adapter comprises a case and a matched circuit board arranged in the case, the matched circuit board structurally comprises a half-wave rectifying circuit, a pulse-width modulation module and a wave filtering output circuit, wherein the half-wave rectifying circuit receives power supply signals of commercial power, direct current signals are output after the half-wave rectification, the signals are sent to the input end of the wave filtering output circuit after being modulated through the pulse-width modulation module, and the direct current signals are sent to a load after carrying out wave filtering processing by the wave filtering output circuit. The utility model has the advantages that the grounding common mode alternating voltage coupled to the direct current output end of the power supply adapter through various paths is effectively eliminated, so the alternating current sound in the IP telephone conversation is eliminated, and the conversation voice quality and the conversation comfort degree are improved.

Description

A kind of and IP phone machine and the supporting power supply adaptor of VOIP access device

Technical field

The utility model belongs to the power technology in the communications field, relates to a kind of power supply adaptor, particularly a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device.

Background technology

Along with development of Communication Technique, IP phone (VoIP) has spread to occasions such as domestic household, the user of small business gradually owing to the low advantage of its rate obtains more and more widely application.Provide the equipment of VoIP business that two kinds of forms are arranged, a kind of form is the equipment that voice service is provided specially, and it has comprised the function of speech processes, communication and conventional telephone set, and the equipment of this form is in the IP phone machine; Another kind of form is the equipment that data, services also is provided except that voice service is provided, it has comprised speech processes and communication function, need external conventional telephone set just can provide voice service, this form equipment is Integrated Access Device or home gateway unit (HGU).More than two kinds of equipment use the power supply of two plug-in source adapters usually owing to be subject to practical application, owing to sound occurring exchanging in the reason conversations such as the induction of human body and distributed capacitance coupling, there is the bigger ac voltage signal of common mode over the ground of amplitude in the output that principle shows as power supply adaptor, behind the voip phone interface, cause producing undesirable interchange sound, had a strong impact on conversation speech quality and conversation comfort level.The technical problem that exchanges sound for above-mentioned generation can solve with three plug-in source adapters, but in the application scenarios of product, often there are not three plug-in supply sockets, therefore the solution of three plug-in source adapters is not accepted to adopt in client, market, existing urgent need to provide a kind of two-phase and with the supporting adapter of IP phone.

Summary of the invention

The purpose of this utility model is to solve to produce the technical problem that exchanges sound in the IP phone communication process, designed a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device, the rectification circuit of power supply adaptor adopts improved half-wave rectifying circuit, exporting stable direct current signal, and the common mode alternating voltage is very little over the ground.

The utility model for realizing the technical scheme that goal of the invention adopts is, a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device, above power supply adaptor comprises housing, be installed in the support circuit plate in the housing, comprise half-wave rectifying circuit in the structure of above-mentioned support circuit plate, pulse width modulation module and filtering output circuit, half-wave rectifying circuit receives the mains supply signal, export direct current signal after the halfwave rectifier, be sent to the input of filtering output circuit after the modulation of pulsewidth modulation module, the filtering output circuit carries out sending direct current signal to load after the Filtering Processing.

Key of the present invention is to adopt half-wave rectifying circuit, prior art generally adopts full-wave rectifying circuit, the very big alternating voltage of common mode over the ground can appear when using in IP phone, the alternating voltage waveform schematic diagram of power supply adaptor output as shown in Figure 2, and adopt improved half-wave rectifying circuit of the present utility model, can make this over the ground the common mode alternating voltage obtain very big decay, as shown in Figure 3, eliminated the common mode alternating voltage that is coupled to the power supply adaptor dc output end by all means effectively, thereby eliminated the interchange sound in the VoIP conversation, improved call voice quality and conversation comfort level.

Below in conjunction with accompanying drawing the utility model is elaborated.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the alternating voltage waveform over the ground that adopts the power supply adaptor dc output end of full-wave rectifying circuit.

Fig. 3 is the alternating voltage waveform over the ground that adopts the power supply adaptor dc output end of half-wave rectifying circuit.

In the accompanying drawing, the 1st, half-wave rectifying circuit, the 2nd, pulse width modulation module, the 3rd, the filtering output circuit, D1, D2 are rectifier diodes, and C1 is a filter capacitor, and C2 is an electric capacity, and T is a transformer, and U is a filtration module, and V represents alternating voltage, and t represents the time.

Embodiment

Referring to Fig. 1, a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device, above power supply adaptor comprises housing, is installed in the support circuit plate in the housing, comprise half-wave rectifying circuit 1, pulse width modulation module 2 and filtering output circuit 3 in the structure of above-mentioned support circuit plate, half-wave rectifying circuit 1 receives the mains supply signal, export direct current signal after the halfwave rectifier, be sent to the input of filtering output circuit 3 after 2 modulation of pulsewidth modulation module, filtering output circuit 3 carries out sending direct current signal to load after the Filtering Processing.

Comprise rectifier diode D1, rectifier diode D2, filter capacitor C1 in the structure of above-mentioned half-wave rectifying circuit 1, the mains supply signal is carried out filtering and is delivered to the input of pulse width modulation module 2 by filter capacitor C1 respectively after rectifier diode D1 and rectifier diode D2 halfwave rectifier.

Comprise transformer T and filtration module U in the structure of above-mentioned filtering output circuit 3, the modulation signal step-down that the input of transformer T receives pulse width modulation module 2 outputs handle and carry out filtering by filtration module U after the output dc voltage signal to load.

Also be provided with supporting capacitor C 2 in the structure of above-mentioned filtering output circuit 3.

Power supply adaptor of the present utility model can be the power supply of IP phone machine, and described IP phone machine is a floating neutral system, does not have direct earth terminal.It has comprised speech processes, communication function and phone function, can directly provide voice service to the user.When concrete the use, what play a key effect is improved half-wave rectifying circuit 1.At first referring to Fig. 2, Fig. 2 is the alternating voltage waveform that prior art adopts full-wave rectifying circuit or bridge rectifier, the amplitude of alternating voltage over the ground that can obviously find out the power supply adaptor output is big, had a strong impact on speech quality, in conversation, can produce continuous " drone " sound; Referring again to Fig. 3, adopt the amplitude attenuation of alternating voltage over the ground of half-wave rectifying circuit 1 output obvious, level off to zero, fundamentally improved the speech quality of IP phone.

Claims

One kind with IP phone machine and the supporting power supply adaptor of VOIP access device, above power supply adaptor comprises housing, be installed in the support circuit plate in the housing, it is characterized in that: comprise half-wave rectifying circuit (1) in the structure of described support circuit plate, pulse width modulation module (2) and filtering output circuit (3), half-wave rectifying circuit (1) receives the mains supply signal, export direct current signal after the halfwave rectifier, be sent to the input of filtering output circuit (3) after pulsewidth modulation module (2) modulation, filtering output circuit (3) carries out sending direct current signal to load after the Filtering Processing.
2. a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device according to claim 1, it is characterized in that: comprise rectifier diode (D1), rectifier diode (D2), filter capacitor (C1) in the structure of described half-wave rectifying circuit (1), the mains supply signal is carried out filtering and is delivered to the input of pulse width modulation module (2) by filter capacitor (C1) respectively after rectifier diode (D1) and rectifier diode (D2) halfwave rectifier.
3. a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device according to claim 1, it is characterized in that: comprise transformer (T) and filtration module (U) in the structure of described filtering output circuit (3), the modulation signal step-down that the input of transformer (T) receives pulse width modulation module (2) output handle and carry out filtering by filtration module (U) after the output dc voltage signal to load.
4. a kind of and IP phone machine and the supporting power supply adaptor of VOIP access device according to claim 3 is characterized in that: also be provided with supporting electric capacity (C2) in the structure of described filtering output circuit (3).