CN201813453U

CN201813453U - Power supply peripheral circuit used for special user interface circuit chip

Info

Publication number: CN201813453U
Application number: CN201020176338XU
Authority: CN
Inventors: 徐哲
Original assignee: SHENZHEN KILO-X ELECTRONIC Co Ltd
Current assignee: SHENZHEN KILO-X ELECTRONIC Co Ltd
Priority date: 2010-04-30
Filing date: 2010-04-30
Publication date: 2011-04-27
Anticipated expiration: 2020-04-30

Abstract

The utility model discloses a power supply peripheral circuit used for a special user interface circuit chip. The peripheral circuit comprises an accelerating switch circuit, a rectifying filter circuit and a sampling feedback circuit connected with the accelerating switch circuit, and a voltage output end led out from the rectifying filter circuit. The accelerating switch circuit comprises a first accelerating switch connected to a positive power supply and a second accelerating switch connected to a negative power supply. The first accelerating switch and the second accelerating switch are respectively connected to a pulse width modulation signal output port of a user interface circuit. The peripheral circuit can expand the application of the special SLIC (Subscriber Line Interface Circuit) chip of VOIP (Voice over Internet Phone) equipment to traditional communication equipment, such as switchboards.

Description

The power supply peripheral circuit that is used for the private subscribers interface circuit chips

Technical field

The utility model relates to mechanics of communication, relates in particular to a kind of power supply peripheral circuit that is used for the private subscribers interface circuit chips.

Background technology

User interface circuit, or claim that (Subscriber Line Interface Circuit SLIC), is a kind of very important circuit unit in the current communication apparatus to Subscriber Line Interface Circuit, on many textbooks it is all had detailed description.

On circuit structure, the feeding classification of user interface circuit has experienced following evolution process: at first be resistance current limliting feeding classification, this mode is because resistance current limliting feed volume is big, and power consumption is big, is replaced by the constant-current feeding mode gradually; And because the constant-current feeding mode about the choosing on the problem of VBAT, exists the contradiction that almost can't take into account, replaced by intelligent feeding classification again.

On implementation, the feeding classification of user interface circuit has experienced following evolution process: at first be discrete device (diode, triode, resistance, electric capacity, inductance, transformer); Because there are many-sided defectives such as volume, reliability, consistency, heat radiation in discrete device, and is replaced by thick film circuit.Along with technological progress is accelerated, the market demand increases, and cost requirement reduces, and existing at present ripe dedicated semiconductor SLIC chip appears on the market, as: the SI3217X family chip of SILICON LABS company; The VE89 family chip of ZARLINK company; The EASY3201 family chip of INFINEON company, W68 family chip of NUVOTON company or the like.Though it is these chips exist difference at profile, software arrangements, the aspects such as function that comprised, about the same on the principle of intelligent feed and implementation.With reference to figure 1, this figure has provided the external interface schematic diagram of a SI32171 chip of SILICON LABS company.

Said chip all is the special-purpose SLIC chip that designs at VOIP equipment specially, and the power supply of this class VOIP equipment all is+6V is to+12V, therefore, chooses and the typical case uses all only adopts positive supply aspect instructing in the design of main power source.With reference to figure 2, this figure has provided the circuit theory diagrams of the peripheral interface of the Switching Power Supply of special-purpose SLIC chip shown in Figure 1 in the prior art.Wherein, resistance R 1 is finished current sampling and is fed back to as shown in Figure 1 special-purpose SLIC chip by SDCH2, resistance R 8 is finished voltage sampling and is fed back to described special-purpose SLIC chip by SVBAT2, and the two-way pulse-width signal DCDRV2 of described special-purpose SLIC chip output and DCFF2 are the pwm pulses of reverse each other, the feedback signal of being taken a sample SDCH2 and SVBAT2 control; Triode Q1, resistance R 6, R9 and triode Q2, resistance R 3, capacitor C 1 constitute an acceleration switch; Inductance L, diode D1,4 of capacitor C constitute a current rectifying and wave filtering circuit, finish energy storage, afterflow, filtering, obtain needed direct voltage VBAT.

Because traditional communication apparatus mostly adopts-the 48V power supply.Thereby the user interface circuit chip of the above-mentioned VOIP of being exclusively used in equipment all can't directly be used on traditional communication apparatus.

The utility model content

Technical problem to be solved in the utility model is: a kind of power supply peripheral circuit that is used for the private subscribers interface circuit chips is provided, this circuit can make the special-purpose SLIC chip at VOIP equipment directly use negative supply as main power source, thereby its range of application is extended on the traditional communication apparatus such as switch.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of power supply peripheral circuit that is used for the private subscribers interface circuit chips, include acceleration switch circuit, the current rectifying and wave filtering circuit, the sampling feedback circuit that link to each other with described acceleration switch circuit and the voltage output end of drawing from described current rectifying and wave filtering circuit, it is characterized in that: described acceleration switch circuit includes first acceleration switch that is connected to positive supply and second acceleration switch that is connected to negative supply, and described first acceleration switch and second acceleration switch are connected respectively to a pulse-width signal output port of user interface circuit.

The beneficial effects of the utility model are:

Embodiment of the present utility model redesigns by the switching circuit periphery to special chip, be that two acceleration switches are set specifically, one is quickened positive supply, one is quickened negative supply, increasing mirror image circuit has simultaneously overcome as the problem of negative supply when the mains current sampling, thereby feasible special-purpose SLIC chip at VOIP equipment can directly use negative supply as main power source, and its range of application has been extended on the traditional communication apparatus such as switch; And can do intelligence to feed and regulate, so reduced circuit heating, improved effective power, saved electric energy and reduced the fault probability of happening of entire circuit.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Description of drawings

Fig. 1 is the external interface schematic diagram of existing a kind of private subscribers interface circuit chips.

Fig. 2 is the existing circuit theory diagrams that are applicable to the power supply peripheral circuit that is used for the private subscribers interface circuit chips shown in Figure 1.

Fig. 3 is the circuit theory diagrams that are applicable to the power supply peripheral circuit embodiment that is used for the private subscribers interface circuit chips shown in Figure 1 that the utility model provides.

Embodiment

The utility model can be widely used in comparatively popular on the market special-purpose SLIC chip at present.As: the SI3217X family chip of SILICON LABS company; The VE89 family chip of ZARLINK company; The EASY3201 family chip of INFINEON company, W68 family chip of NUVOTON company or the like.SI32171 chip with SILICON LABS company shown in Figure 1 is an example below, describes an embodiment of the power supply peripheral circuit that is used for the private subscribers interface circuit chips that the utility model provide in detail with reference to figure 3.

Present embodiment mainly includes acceleration switch circuit, the current rectifying and wave filtering circuit that links to each other with described acceleration switch circuit, the sampling feedback circuit of drawing from described acceleration switch circuit and current rectifying and wave filtering circuit and the voltage output end VBAT that draws from described current rectifying and wave filtering circuit, described acceleration switch circuit includes first acceleration switch that is connected to positive supply and second acceleration switch that is connected to negative supply, and described first acceleration switch and second acceleration switch are connected respectively to a pulse-width signal output port of user interface circuit.

As shown in Figure 3, during specific implementation, described first acceleration switch can specifically include:

Triode Q1, the first pulse-width signal output port DCDRV2, the emitter that its base stage is connected to user interface circuit is connected to the negative supply incoming end, collector electrode is connected to described current rectifying and wave filtering circuit;

Diode D3, its both positive and negative polarity are connected to emitter and the base stage of triode Q1;

Resistance R 9, in parallel with described diode D3;

Resistance R 6 and capacitor C 2 are connected between the described triode Q1 and the first pulse-width signal output port DCDRV2.

Described second acceleration switch includes:

Triode Q2, second pulse-width signal output port DCFF2, the emitter that its base stage is connected to user interface circuit is connected to the positive supply incoming end, collector electrode is connected to described current rectifying and wave filtering circuit;

Resistance R 4 is arranged between the emitter and positive supply incoming end of triode Q2;

Diode D4, its both positive and negative polarity are connected to base stage and the positive supply incoming end of triode Q1;

Resistance R 3, in parallel with described diode D4;

Resistance R 5 and capacitor C 1 are connected between the described triode Q2 and the second pulse-width signal output port DCFF2;

Capacitor C 3 is connected in parallel on the two ends of resistance R 5.

After described current rectifying and wave filtering circuit is finished energy storage, afterflow, filtering, draw needed direct voltage VBAT, it specifically includes:

Inductance L, its two ends link to each other with the collector electrode of described triode Q1 and the collector electrode of triode Q2 respectively;

Diode D1, its negative pole links to each other with the collector electrode of described triode Q2, and is anodal by capacitor C 4 ground connection;

Diode D2, its positive pole links to each other with the collector electrode of described triode Q1, minus earth, its effect is to provide the afterflow passage for L;

Resistance R 7 is arranged between the negative pole and voltage output end of diode D1.

Described sampling feedback circuit includes:

The first sampled signal feedback circuit, its output is drawn from described voltage output end by resistance R 8;

The second sampled signal feedback circuit, it includes a triode Q3, and draw output from the collector electrode of this triode Q3, and the emitter of described triode Q3 is connected to positive supply input, collector electrode then are connected to described triode Q2 by a resistance R 1 ground connection, base stage base stage by a resistance R 2.

Wherein, triode Q1 can adopt NPN type triode, triode Q2 can adopt positive-negative-positive triode, triode Q3 can adopt the positive-negative-positive triode.

In the present embodiment, the negative supply that triode Q1 emitter is connected for-48V or-24V, also can be other numerical value power supply;

Resistance R 1 finish current sampling by SDCH2 feed back to special chip shown in Figure 1, resistance R 8 is finished voltage sampling and is fed back to described special chip by SVBAT2, wherein, the second sampled signal feedback circuit is a mirror image circuit, the effect of triode Q3 is to pass through mirror image, to be the electric current in the resistance R 1 by the current conversion of inductance L, to reach sampling voltage greater than 0 purpose;

Diode D3, D4 are for the acceleration of switch and protection;

And the first pulse-width signal output port DCDRV2 and the second pulse-width signal output port are from special chip output pwm pulse reverse each other, the feedback signal of being taken a sample SDCH2 and SVBAT2 control.

Compared to existing technology, the utility model redesigns by the switching circuit periphery to special-purpose SLIC chip, be that two acceleration switches are set specifically, one is quickened positive supply, one is quickened negative supply, increasing mirror image circuit has simultaneously overcome as the problem of negative supply when the mains current sampling, thereby feasible special-purpose SLIC chip at VOIP equipment can directly use negative supply as main power source, and its range of application has been extended on the traditional communication apparatus such as switch; And can do intelligence to feed and regulate, so reduced circuit heating, improved effective power, saved electric energy and reduced the fault probability of happening of entire circuit.

The above is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.

Claims

1. power supply peripheral circuit that is used for the private subscribers interface circuit chips, include acceleration switch circuit, the current rectifying and wave filtering circuit, the sampling feedback circuit that link to each other with described acceleration switch circuit and the voltage output end of drawing from described current rectifying and wave filtering circuit, it is characterized in that: described acceleration switch circuit includes first acceleration switch that is connected to positive supply and second acceleration switch that is connected to negative supply, and described first acceleration switch and second acceleration switch are connected respectively to a pulse-width signal output port of user interface circuit.

2. the power supply peripheral circuit that is used for the private subscribers interface circuit chips as claimed in claim 1 is characterized in that, described first acceleration switch includes:

Triode Q1, the first pulse-width signal output port, the emitter that its base stage is connected to user interface circuit is connected to the negative supply incoming end, collector electrode is connected to described current rectifying and wave filtering circuit;

Resistance R 9, in parallel with described diode D3;

Resistance R 6 and capacitor C 2 are connected between the described triode Q1 and the first pulse-width signal output port.

3. the power supply peripheral circuit that is used for the private subscribers interface circuit chips as claimed in claim 2 is characterized in that, described second acceleration switch includes:

Triode Q2, second pulse-width signal output port, the emitter that its base stage is connected to user interface circuit is connected to the positive supply incoming end, collector electrode is connected to described current rectifying and wave filtering circuit;

Resistance R 3, in parallel with described diode D4;

Resistance R 5 and capacitor C 1 are connected between the described triode Q2 and the second pulse-width signal output port;

Capacitor C 3 is connected in parallel on the two ends of resistance R 5.

4. the power supply peripheral circuit that is used for the private subscribers interface circuit chips as claimed in claim 3 is characterized in that described current rectifying and wave filtering circuit includes:

Diode D2, its positive pole links to each other minus earth with the collector electrode of described triode Q1;

5. the power supply peripheral circuit that is used for the private subscribers interface circuit chips as claimed in claim 4 is characterized in that described sampling feedback circuit includes:

6. the power supply peripheral circuit that is used for the private subscribers interface circuit chips as claimed in claim 5 is characterized in that: triode Q1 is that NPN type triode, triode Q2 are that positive-negative-positive triode, triode Q3 are the positive-negative-positive triode.

7. as each described power supply peripheral circuit that is used for the private subscribers interface circuit chips among the claim 1-6, it is characterized in that: described negative supply for-48V or-the 24V power supply.