CN202818110U - Non-Y capacitor switch power supply - Google Patents
Non-Y capacitor switch power supply Download PDFInfo
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- CN202818110U CN202818110U CN201220485004.XU CN201220485004U CN202818110U CN 202818110 U CN202818110 U CN 202818110U CN 201220485004 U CN201220485004 U CN 201220485004U CN 202818110 U CN202818110 U CN 202818110U
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- winding
- transformer
- power supply
- rectifier bridge
- primary
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Abstract
The utility model relates to a non-Y capacitor switch power supply which includes a rectifier bridge and a transformer. The direct current output terminal of the rectifier bridge is connected with the transformer. The transformer includes a magnetic core, a primary main winding, a secondary winding, and an auxiliary winding which are wound on the magnetic core in order. The transformer primary winding is connected in series with a change-over switch. The primary winding and the secondary winding of the transformer are same in turn number and phase. Each rectifying member in the rectifier bridge is connected in parallel with a capacitor. The non-Y capacitor switch power supply can completely eliminate the power frequency noise, does not interference an audio device, and is low in cost. Because the switch power supply dose not use a Y capacitor to reduce the electromagnetic radiation of the transformer, the electric leakage is prevented. Through winding the primary shielding winding and the secondary shielding winding which are same in turn number and phase, the common mode interference current from the primary coupling to the secondary is greatly reduced, the adverse effect of the power frequency noise on an electric appliance is reduced, the conversation quality is improved, and the data transmission quality is also improved.
Description
Technical field
The utility model relates to the field of switch power in the electronic product, especially relates to a kind of Switching Power Supply of no Y capacitance.
Background technology
At present, Switching Power Supply is portable and smart because having, input voltage range large, the efficient high, so be widely used in the electronic system.Existing most of home-use electronic equipments (such as television set, stereo set, telephone set, modulator-demodulator, set-top box etc.), its power supply device all is Switching Power Supply, and all adopted floatingly and designed, yet in floating neutral system, all can introduce the common mode industrial frequency noise.In Switching Power Supply design, the industrial frequency noise of how introducing in the filtering floating neutral system becomes an important problem.
Popular along with mobile phone with metal shell, during for fear of cell-phone charging leakage current to the stimulation of human body, no Y capacitance oneself through becoming the generally requirement to charger for mobile phone.The operation principle of common Switching Power Supply meter as shown in Figure 1.Capacitor C among the figure is usually said Y electric capacity, AC signal can by this Y electric capacity from elementary be coupled to secondary.After the output of this Switching Power Supply connects load, because impedance mismatch, will make common-mode noise convert differential mode noise to, hear AC noise so will show as people's ear this moment in phone, namely can affect speech quality, in modulator-demodulator, then show as message transmission rate and descend, affect data transmission quality etc.The leakage current of Switching Power Supply is understood interference tones equipment in addition, produces the noise of low frequency, and this occasion just requires Switching Power Supply to remove Y electric capacity.Removing Y electric capacity, to satisfy again the electromagnetic radiation relevant criterion be a larger challenge for designing technique level and the manufacturing ability of manufacturer.
Summary of the invention
The utility model purpose provides a kind of Switching Power Supply of no Y capacitance.To solve large, the easy interference tones equipment of the existing industrial frequency noise of prior art, cost than the high-technology problem.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of Switching Power Supply of no Y capacitance, comprise rectifier bridge, transformer, wherein the dc output end of rectifier bridge is connected with transformer, described transformer comprises magnetic core, successively elementary main winding, secondary winding and the auxiliary winding on this magnetic core; Be connected in series diverter switch in the described primary winding, the armature winding of this transformer has the identical number of turns and same-phase with secondary winding; Be parallel with electric capacity on each rectifying device in the described rectifier bridge.
As preferably, described elementary main winding connects the primary shield winding; Secondary winding connects the secondary shielding winding; Be provided with between described primary shield winding and the secondary shielding winding for the screen that intercepts noise transfer.
As preferably, an end of described primary shield winding links to each other with the negative or positive electrode of described elementary main winding; One end of secondary shielding winding links to each other with the negative or positive electrode of described secondary winding.
As preferably, the material of described primary shield winding and secondary shielding winding is Copper Foil.
The utlity model has and eliminate industrial frequency noise fully, audio frequency apparatus produced disturb and the advantage such as cost is lower.Y electric capacity in the deletion conventional switch power supply, and on rectifier diode the mode of shunt-wound capacitance, come the floating neutral system industrial frequency noise of filtering Switching Power Supply.Owing to do not adopt Y electric capacity to reduce the electromagnetic radiation of transformer, so leaky can not occur.By coiling same number of turns and synchronous primary shield winding and secondary shielding winding, be connected with secondary winding with elementary main winding respectively, so that the effective capacitance of transformer reduces greatly, thereby greatly reduce so that be incorporated into secondary common mode disturbances electric current from elementary misfortune, thereby solve the problem of electromagnetic radiation, eliminate the harmful effect of industrial frequency noise in electric equipment, to promote speech quality, data transmission quality etc.
Description of drawings
Fig. 1 is the application working circuit diagram of existing Switching Power Supply.
Fig. 2 is the circuit diagram of switching capacity of the present utility model.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described in detail.
Fig. 2 is the circuit diagram of switching capacity of the present utility model.As shown in Figure 2, a kind of Switching Power Supply of no Y capacitance mainly is comprised of rectifier bridge, transformer etc., and wherein the dc output end of rectifier bridge is connected with transformer, this transformer comprises magnetic core, successively elementary main winding, secondary winding and the auxiliary winding on this magnetic core; Be connected in series diverter switch in the described primary winding, the armature winding of this transformer has the identical number of turns and same-phase with secondary winding; Be parallel with electric capacity on each rectifying device in the described rectifier bridge.
Elementary main winding connects the primary shield winding; Secondary winding connects the secondary shielding winding; Be provided with between described primary shield winding and the secondary shielding winding for the screen that intercepts noise transfer.One end of primary shield winding links to each other with the negative or positive electrode of described elementary main winding; One end of secondary shielding winding links to each other with the negative or positive electrode of described secondary winding.The material of primary shield winding and secondary shielding winding is Copper Foil.
Behind the Y electric capacity that removes between Switching Power Supply elementary and secondary, it is simple coil-induced coupling between the armature winding of transformer and the secondary winding, by coiling same number of turns and synchronous primary shield winding and secondary shielding winding, be connected with secondary winding with elementary main winding respectively, so that the effective capacitance of transformer reduces greatly.Thereby greatly reduce so that be incorporated into secondary common mode disturbances electric current from elementary misfortune, no longer include the coupling that Y electric capacity brings, so it is secondary that the industrial frequency noise of interchange end does not have approach to pass to, so just there will be no the industrial frequency noise of 50Hz between its output voltage and the ground, thereby can not be created in again in the IP telephony system counter productives such as speed that the call voice quality can be affected, in modulator-demodulator, then can affect transfer of data, thereby so that elementaryly be coupled to secondary common mode disturbances electric current and greatly reduce, thereby solve the problem of electromagnetic radiation.
Claims (4)
1. the Switching Power Supply of a no Y capacitance comprises rectifier bridge, transformer, and wherein the dc output end of rectifier bridge is connected with transformer, it is characterized in that, described transformer comprises magnetic core, successively elementary main winding, secondary winding and the auxiliary winding on this magnetic core; Be connected in series diverter switch in the described primary winding, the armature winding of this transformer has the identical number of turns and same-phase with secondary winding; Be parallel with electric capacity on each rectifying device in the described rectifier bridge.
2. according to the Switching Power Supply of claims 1 described a kind of no Y capacitance, it is characterized in that described elementary main winding connects the primary shield winding, secondary winding connects the secondary shielding winding; Be provided with between described primary shield winding and the secondary shielding winding for the screen that intercepts noise transfer.
3. according to the Switching Power Supply of claims 1 or 2 described a kind of no Y capacitances, it is characterized in that an end of described primary shield winding links to each other with the negative or positive electrode of described elementary main winding; One end of secondary shielding winding links to each other with the negative or positive electrode of described secondary winding.
4. according to the Switching Power Supply of claims 2 described a kind of no Y capacitances, it is characterized in that the material of described primary shield winding and secondary shielding winding is Copper Foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220485004.XU CN202818110U (en) | 2012-09-21 | 2012-09-21 | Non-Y capacitor switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220485004.XU CN202818110U (en) | 2012-09-21 | 2012-09-21 | Non-Y capacitor switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202818110U true CN202818110U (en) | 2013-03-20 |
Family
ID=47876916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220485004.XU Expired - Lifetime CN202818110U (en) | 2012-09-21 | 2012-09-21 | Non-Y capacitor switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202818110U (en) |
-
2012
- 2012-09-21 CN CN201220485004.XU patent/CN202818110U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170629 Address after: 523455 Guangdong province Dongguan Dongkeng Dongkeng Avenue South, No. 365 Patentee after: DONGGUAN CITY MAISI PU ELECTRONICS CO.,LTD. Address before: 518110 Guangdong city of Shenzhen province Baoan District Guanlan street Huangkeng community Hedong Village No. 437 Patentee before: SHENZHEN MASS POWER ELECTRONIC Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130320 |
|
| CX01 | Expiry of patent term |