CN202759391U - Switching power supply for network telephone system - Google Patents
Switching power supply for network telephone system Download PDFInfo
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- CN202759391U CN202759391U CN 201220289346 CN201220289346U CN202759391U CN 202759391 U CN202759391 U CN 202759391U CN 201220289346 CN201220289346 CN 201220289346 CN 201220289346 U CN201220289346 U CN 201220289346U CN 202759391 U CN202759391 U CN 202759391U
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Abstract
Disclosed is a switching power supply for a network telephone system, comprising an input filter module, an input rectifier module, a power transformation module and an output filter and rectifier module and further comprising a ferrite module. An input end of the input filter module is used for being connected with an alternating-current power supply, an output end of the input filter module is connected with an input end of the input rectifier module, an output end of the input rectifier module is connected with an input end of the power transformation module, an output end of the power transformation module is connected with an input end of the output filter and rectifier module, and an output end of the output filter and rectifier module is connected with a network telephone after surrounding the ferrite module. Low-frequency interference signals among signals output by the output end of the output filter and rectifier module are filtered by using the low frequency suppression property of the ferrite module, thus eliminating the noise in the network telephone system connected with the output end of the output filter and rectifier module.
Description
Technical field
The utility model relates to Switching Power Supply, particularly relates to a kind of Switching Power Supply for network phone system.
Background technology
People's earshot almost can both be heard for the noise people in this frequency range probably at 20HZ-30KHZ, so enter the VOIP(networking telephone at the noise of this frequency range under the present electromagnetic environment) after the system, severe jamming people's the effect of making a phone call.
The work of every kind of electronic equipment all be unable to do without the power supply unit power supply, and the Switching Power Supply high as efficient, that volume is little is large-scale application in electronic equipment.The operating frequency of present AC/DC Switching Power Supply is to almost overlapping with people's hearing frequency range at the low-order harmonic of this switching frequency of 20KHZ-100KHZ, so the electromagnetic interference of Switching Power Supply is on the VOIP(networking telephone) impact is very large.
And the noise jamming that Switching Power Supply produces will be passed to the VOIP system, and the path only has by the conduction of DC power transmission line with by two kinds of approach of space radiation.For space radiation, Switching Power Supply has all been taked measure in design, radiation level has been restricted to very low level, and the VOIP system be difficult to receive and hears to the relief people of telephone set by telephone wire.So the overwhelming majority that can transmit and receive in transmission is DC power transmission line conducted interference.
Conducted interference can be divided into: differential mode interference and common mode disturbances.
Because differential mode interference is to disturb between the line of inputting and between the line of output, such as live wire and the zero line of alternating current, and positive pole and the negative pole of DC output.But behind their connecting system, the impedance comparison between line is little, and interference signal substantially all can be returned power supply, and is smaller on the impact of equipment.But for common mode interference signal, since between input line and DC output line be isolation and with respect to safely between (the earth) impedance very large, interference signal does not have Releasing loop, all enters into the VOIP system and allows the people hear to telephone set so disturb, and affects communication effect.
General AC/DC Switching Power Supply is all sealing in a common mode inductance in the interchange input line, this inductance can filtering or the attenuator switch power supply to the interference of electrical network, simultaneously also can filtering or the decay electrical network on the impact of Switching Power Supply, under suitable layout and transformer winding technique, its Electro Magnetic Compatibility (150KHZ-1GHZ) meets the demands, and does not require for the frequency that is lower than this frequency range.But will export power supply (satisfying EMC Requirements) the access VOIP system that does not connect output filter, the result hears father-in-law's song in telephone set.Common mode inductance access commonly used is being exported, and father-in-law's song does not weaken, and increases inductance value, and father-in-law's song still exists.
The utility model content
Based on this, be necessary for the interference problem in the audiorange in the networking telephone, thereby a kind of Switching Power Supply that is used for network phone system of can the filtering low-frequency disturbance eliminating the noise of network phone system is provided.
A kind of Switching Power Supply for network phone system, comprise for the input filter module of the AC power of input being carried out filtering, be used for to filtered AC power be rectified into DC power supply the input rectifying module, be used for the power transformation module that the pressure drop with the DC power supply after the rectification output reduces and the output filtering rectification module that is used for the DC power supply of described power transformation module output is carried out filter rectification, described Switching Power Supply also comprises the ferrite module;
The input of described input filter module is used for being connected with AC power, the output of described input filter module is connected with the input of described input rectifying module, the output of described input rectifying module is connected with the input of described power transformation module, the output of described power transformation module is connected with the input of described output filtering rectification module, and the output of described output filtering rectification module is used for being connected with the networking telephone after around described ferrite module.
Among embodiment, described ferrite module is the tubular ferrite therein.
Among embodiment, the output of described output filtering rectification module is around in described tubular ferrite surface along the ferritic radial loop of described tubular therein.
Among embodiment, the output of described output filtering rectification module axially passes around described tubular ferrite from the ferritic cavity of described tubular along described tubular is ferritic therein.
Among embodiment, described tubular ferrite is the high impedance ferrite therein.
Among embodiment, the power line of the output of described output filtering rectification module and power supply return wire are all around described tubular ferrite therein.
Among embodiment, described input filter module, described input rectifying module, described power transformation module, described output filtering rectification module and described ferrite module are arranged in the shell of described Switching Power Supply therein.
Among embodiment, described ferrite module is circular ferrite therein.
Among embodiment, the output of described output filtering rectification module is Double-wire parallel wound around the mode of described circular ferrite therein.
Above-mentioned Switching Power Supply for network phone system is surrounded on the ferrite module by the output with the output filtering rectification module, utilize the low-frequency interference signal in the low frequency inhibition activity filtering output filtering rectification module output output signal of ferrite module, thereby so that be eliminated with noise in the network phone system that output filtering rectification module output is connected.
Description of drawings
Fig. 1 is the structure chart that is used for the Switching Power Supply of network phone system;
Fig. 2 is that the output of output filtering rectification module among the embodiment is around the schematic diagram of ferrite module;
Fig. 3 is that the output of output filtering rectification module among another embodiment is around the schematic diagram of ferrite module.
Embodiment
As shown in Figure 1, be the structure chart of the Switching Power Supply that is used for network phone system.A kind of Switching Power Supply for network phone system, comprise for the input filter module 102 of the AC power of input being carried out filtering, be used for to filtered AC power be rectified into DC power supply input rectifying module 104, be used for the power transformation module 106 that the pressure drop with the DC power supply after the rectification output reduces, output filtering rectification module 108 and the ferrite module 110 that is used for the DC power supply of described power transformation module output is carried out filter rectification.
The input of input filter module 102 is used for being connected with AC power, the output of input filter module 102 is connected with the input of input rectifying module 104, the output of input rectifying module 104 is connected with the input of power transformation module 106, the output of power transformation module 106 is connected with the input of output filtering rectification module 108, and the output of output filtering rectification module 108 is rear for being connected with the networking telephone around ferrite module 110.
The input input ac power of input filter module 102, be transferred to input rectifying module 104 after the filtering of AC power by input filter module 102, then carry out rectification by 104 pairs of filtered AC power of input rectifying module, the AC power after the rectification of input rectifying module 104 is transformed to DC power supply.Involve after filtration rectification DC power supply be input to power transformation module 106, reduced by the pressure drop of power transformation module 106 with DC power supply.Because the DC power supply of output has various little interference electric waves, therefore need to again carry out filtering and rectification to the DC power supply of output, so that the DC power supply of final output is desirable power supply.
The output of output filtering rectification module 108 around ferrite module 110 after, low-frequency interference signal in the output filtering rectification module 108 is by 110 filterings of ferrite module, therefore, with the networking telephone that the output of output filtering rectification module 108 is connected in noise be eliminated.
Ferrite in the ferrite module 110 is a kind of ferromagnetic metal oxide that has, and with regard to electrical characteristics, ferritic resistivity is more much bigger than metal, alloy magnetic material, and also has higher dielectric property.Ferritic magnetic property has higher magnetic permeability when also showing high frequency, correspondingly, ferritic magnetic property has higher impedance when low frequency, thereby can the filtering low-frequency interference signal.
In the present embodiment, ferrite module 110 is the tubular ferrite.As shown in Figure 2, the output of output filtering rectification module 108 is around in tubular ferrite surface along the ferritic radial loop of tubular.
Perhaps as shown in Figure 3, the output of output filtering rectification module 108 axially passes around the tubular ferrite from the ferritic cavity of tubular along tubular is ferritic.
The tubular ferrite is the high impedance ferrite.The ferrite of high impedance is relatively good to the low-frequency interference signal filtration result.The frequency of the interference signal that suppresses as required is different, can adopt the Ferrite Material of different magnetic permeabilitys.
When power line uses, can be with the power line of the output of output filtering rectification module and power supply return wire all around described tubular ferrite.
The output of output filtering rectification module is surrounded on the impedance of the number of turn decision low frequency on the ferritic surface of described tubular.For example, increase the number of turn of the output line of output filtering rectification module 108 outputs that are surrounded on tubular ferrite surface, can increase the impedance of low-frequency interference signal.
In the present embodiment, input filter module 102, input rectifying module 104, power transformation module 106, output filtering rectification module 108 and ferrite module 110 are arranged in the shell of Switching Power Supply.Ferrite module 110 is arranged in the shell of Switching Power Supply, compared with the housing exterior that ferrite module 110 is placed Switching Power Supply, the profile of Switching Power Supply is more attractive in appearance.And ferrite module 110 self is broken easily, places the Switching Power Supply housing exterior, and when suffering external impact or pulling force, ferrite module 110 is broken easily, and the position that perhaps is connected with output filtering rectification module 108 outputs disconnects easily.And after ferrite module 110 placed the Switching Power Supply enclosure, these problems all will be avoided.
After ferrite module 110 was placed the enclosure of Switching Power Supply, the ferritic volume of tubular can be bigger than normal, thereby cause the shell of Switching Power Supply also must also will increase.Therefore, in the present embodiment, ferrite module 110 can also be circular ferrite.
The output of output filtering rectification module 108 is Double-wire parallel wound around the mode of circular ferrite.The mode of employing Double-wire parallel wound is about to circular ferrite and is made into common mode inductance.
Above-mentioned Switching Power Supply for network phone system is surrounded on the ferrite module by the output with the output filtering rectification module, utilize the low-frequency interference signal in the low frequency inhibition activity filtering output filtering rectification module output output signal of ferrite module, thereby so that be eliminated with noise in the network phone system that output filtering rectification module output is connected.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. Switching Power Supply that is used for network phone system, comprise for the input filter module of the AC power of input being carried out filtering, be used for to filtered AC power be rectified into DC power supply the input rectifying module, be used for the power transformation module that the pressure drop with the DC power supply after the rectification output reduces and the output filtering rectification module that is used for the DC power supply of described power transformation module output is carried out filter rectification, it is characterized in that described Switching Power Supply also comprises the ferrite module;
The input of described input filter module is used for being connected with AC power, the output of described input filter module is connected with the input of described input rectifying module, the output of described input rectifying module is connected with the input of described power transformation module, the output of described power transformation module is connected with the input of described output filtering rectification module, and the output of described output filtering rectification module is used for being connected with the networking telephone after around described ferrite module.
2. the Switching Power Supply for network phone system according to claim 1 is characterized in that, described ferrite module is the tubular ferrite.
3. the Switching Power Supply for network phone system according to claim 2 is characterized in that, the output of described output filtering rectification module is around in described tubular ferrite surface along the ferritic radial loop of described tubular.
4. the Switching Power Supply for network phone system according to claim 2 is characterized in that, the output of described output filtering rectification module axially passes around described tubular ferrite from the ferritic cavity of described tubular along described tubular is ferritic.
5. the Switching Power Supply for network phone system according to claim 2 is characterized in that, described tubular ferrite is the high impedance ferrite.
6. the Switching Power Supply for network phone system according to claim 2 is characterized in that, the power line of the output of described output filtering rectification module and power supply return wire are all around described tubular ferrite.
7. the Switching Power Supply for network phone system according to claim 1, it is characterized in that described input filter module, described input rectifying module, described power transformation module, described output filtering rectification module and described ferrite module are arranged in the shell of described Switching Power Supply.
8. the Switching Power Supply for network phone system according to claim 1 is characterized in that, described ferrite module is circular ferrite.
9. according to the described Switching Power Supply for network phone system of claim, it is characterized in that the output of described output filtering rectification module is Double-wire parallel wound around the mode of described circular ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220289346 CN202759391U (en) | 2012-06-19 | 2012-06-19 | Switching power supply for network telephone system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220289346 CN202759391U (en) | 2012-06-19 | 2012-06-19 | Switching power supply for network telephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202759391U true CN202759391U (en) | 2013-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220289346 Expired - Lifetime CN202759391U (en) | 2012-06-19 | 2012-06-19 | Switching power supply for network telephone system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202759391U (en) |
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2012
- 2012-06-19 CN CN 201220289346 patent/CN202759391U/en not_active Expired - Lifetime
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130227 |