CN201122897Y - Common-mode radiation suppression circuit of switch power source - Google Patents
Common-mode radiation suppression circuit of switch power source Download PDFInfo
- Publication number
- CN201122897Y CN201122897Y CNU2007202015670U CN200720201567U CN201122897Y CN 201122897 Y CN201122897 Y CN 201122897Y CN U2007202015670 U CNU2007202015670 U CN U2007202015670U CN 200720201567 U CN200720201567 U CN 200720201567U CN 201122897 Y CN201122897 Y CN 201122897Y
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- circuit
- mode radiation
- common
- triode
- power supply
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Abstract
The utility model relates to a common-mode radiation suppressing circuit, in particular to a common-mode radiation suppressing circuit for a switch power supply. The utility model discloses an electric circuit which has stable output voltage and can effectively suppress the common-mode radiation of the switch power supply. The common-mode radiation suppressing circuit adopts the technical proposal that the common-mode radiation suppressing circuit comprises a basic rectification circuit and an electronic filtering circuit which are connected in series. The electronic filtering circuit is composed of a resistor (R1), a capacitor (C1) and a triode (Q1); a current collecting electrode of the triode (Q1) is connected with the output terminal of the basic rectification circuit, and the base electrode is connected with the capacitor (C1); both terminals of the resistor (R1) are respectively connected with the base electrode and the collecting electrode of the triode (Q1); the cathode of the capacitor (C1) is connected with the ground. The common-mode radiation suppressing circuit has the advantages that the common-mode radiation of the switching power supply can be effectively suppressed, and the output voltage is stable.
Description
Technical field
The utility model relates to a kind of common mode radiation and suppresses circuit, relates in particular to a kind of Switching Power Supply common mode radiation and suppresses circuit.
Background technology
Switching Power Supply is compared with linear stabilized power supply, has many advantages such as power consumption is little, efficient is high, voltage stabilized range is wide, now has been widely used in fields such as household electrical appliance, communication, automatic control.But the outstanding shortcoming of Switching Power Supply is to produce stronger electromagnetic interference (EMI), and communication apparatus and electronic product are caused interference.The interference of electric current high order harmonic component and the peak voltage interference that are produced by basic rectification circuit are the principal elements that the EMI signal produces.As shown in Figure 1, in conventional switch power supply secondary winding power supply circuits, the electric current high order harmonic component that basic rectification circuit produces is in the course of the work disturbed and the peak voltage interference makes that the output current after the rectification no longer is the single-frequency electric current.This output current wave is decomposed into the DC component alternating current component different with a series of frequencies, and its frequency band broad and harmonic ratio are abundanter.The alternating current component that only adopts the volume electrochemical capacitor C big, that the appearance value is bigger among Fig. 1 to come the filtering output voltage only can reduce the amplitude of part alternating current component, can't effectively suppress the common mode radiation of Switching Power Supply.
The utility model content
The technical problems to be solved in the utility model proposes a kind of output voltage stabilization at disadvantages of background technology exactly and can suppress the circuit of Switching Power Supply common mode radiation effectively.
The technical scheme in the invention for solving the above technical problem is that the Switching Power Supply common mode radiation suppresses circuit, comprises basic rectification circuit and electronic filtering circuit, described basic rectification circuit and electronic filtering circuit serial connection.
Described electronic filtering circuit is made of resistance R 1, capacitor C 1, triode Q1; The collector electrode of described triode Q1 is connected with basic rectification circuit output end, base stage and 1 anodal connection of capacitor C; Described resistance R 1 two ends are connected with collector electrode with the base stage of triode Q1 respectively; The negative pole of described capacitor C 1 is connected with ground.
The beneficial effects of the utility model are, can suppress the Switching Power Supply common mode radiation effectively, and output voltage stabilization.
Description of drawings
Fig. 1 is a conventional switch power supply secondary winding circuit diagram;
Fig. 2 is the utility model circuit diagram.
L1 is an inductance among the figure, and R1 is a resistance, and Q1 is a triode, and C1, C2 are electric capacity, and D1 is a diode.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, Switching Power Supply common mode radiation of the present utility model suppresses circuit and comprises basic rectification circuit and electronic filtering circuit.Wherein basic rectification circuit is made of inductance L 1, capacitor C 2, diode D1; The electronic filtering circuit is made of resistance R 1, capacitor C 1, triode Q1; Described basic rectification circuit and electronic filtering circuit serial connection; The collector electrode of described triode Q1 is connected with the output V1 of basic rectification circuit, and base stage is connected with the positive pole of capacitor C 1; One end of described resistance R 1 is connected with the collector electrode of triode Q1, and the other end is connected with the base stage of triode Q1; The negative pole of described capacitor C 1 is connected with ground.
During Switching Power Supply work, basic rectification circuit also disturbs by high frequency break-make generation bandwidth and abundant electric current high order harmonic component and the peak voltage of harmonic wave when producing DC component, is output as the different alternating current component of a series of frequencies.For a series of high-frequency ac components of rectification output, resistance R 1 and capacitor C 1 constitute low pass filter, and equivalent filter electric capacity is that the product of the capacitance c of the magnificationfactor of triode Q1 and capacitor C 1 is β c.But need not adopt large volume Da Rong value electric capacity with regard to high order harmonic component composition and peak voltage composition in the filtering alternating current component like this, reach preferably common mode radiation is suppressed effect.And, can also reach the output voltage regulation result by triode Q1 for the DC component that basic rectification circuit is exported.
Claims (2)
1. the Switching Power Supply common mode radiation suppresses circuit, comprises basic rectification circuit, it is characterized in that, also comprises the electronic filtering circuit; Described basic rectification circuit and electronic filtering circuit serial connection.
2. Switching Power Supply common mode radiation according to claim 1 suppresses circuit, it is characterized in that, described electronic filtering circuit is made of resistance (R1), electric capacity (C1), triode (Q1); The collector electrode of described triode (Q1) is connected with basic rectification circuit output end, and base stage is connected with electric capacity (C1) is anodal; Described resistance (R1) two ends are connected with collector electrode with the base stage of triode (Q1) respectively; The minus earth of described electric capacity (C1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007202015670U CN201122897Y (en) | 2007-12-05 | 2007-12-05 | Common-mode radiation suppression circuit of switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007202015670U CN201122897Y (en) | 2007-12-05 | 2007-12-05 | Common-mode radiation suppression circuit of switch power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122897Y true CN201122897Y (en) | 2008-09-24 |
Family
ID=40010138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007202015670U Expired - Lifetime CN201122897Y (en) | 2007-12-05 | 2007-12-05 | Common-mode radiation suppression circuit of switch power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201122897Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860319A (en) * | 2010-06-01 | 2010-10-13 | 华东交通大学 | Multi-target large powder inverter common-mode voltage suppressing method |
| CN112398540A (en) * | 2019-08-14 | 2021-02-23 | 苏州旭创科技有限公司 | Optical module and signal processing system comprising same |
-
2007
- 2007-12-05 CN CNU2007202015670U patent/CN201122897Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860319A (en) * | 2010-06-01 | 2010-10-13 | 华东交通大学 | Multi-target large powder inverter common-mode voltage suppressing method |
| CN101860319B (en) * | 2010-06-01 | 2012-05-23 | 华东交通大学 | Multi-target large powder inverter common-mode voltage suppressing method |
| CN112398540A (en) * | 2019-08-14 | 2021-02-23 | 苏州旭创科技有限公司 | Optical module and signal processing system comprising same |
| CN112398540B (en) * | 2019-08-14 | 2022-02-15 | 苏州旭创科技有限公司 | Optical module and signal processing system comprising same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080924 |