CN204616174U - A kind of π type filter circuit - Google Patents
A kind of π type filter circuit Download PDFInfo
- Publication number
- CN204616174U CN204616174U CN201520332160.6U CN201520332160U CN204616174U CN 204616174 U CN204616174 U CN 204616174U CN 201520332160 U CN201520332160 U CN 201520332160U CN 204616174 U CN204616174 U CN 204616174U
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- electric capacity
- module
- filter circuit
- inductance
- type filter
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Abstract
A kind of π type filter circuit, it comprises: Anti-surging module, rectification module and π type filtration module; Described Anti-surging module input is electrically connected on power supply, and output is coupled to described rectification module, and the output of rectification module is coupled to described π type filtration module, wherein, π type filtration module comprises electric capacity C1, electric capacity C2, inductance L 1, magnetic bead FB1 and resistance R1, described electric capacity C1, electric capacity C2, inductance L 1 and magnetic bead FB1 form series circuit, the two ends of electric capacity C1 are connected to rectification module output, and inductance L 1 two ends are parallel with shunt resistance R1.π type filter circuit of the present utility model, is applicable to the small-power switching power-supply within 10W or LED light source (candle lamp, GU10, bulb lamp, ceiling light); Do not need common mode inductance, electric capacity, Material Cost is extremely low, and reliability is high.
Description
Technical field
The utility model relates to filter circuit technical field, particularly relates to a kind of π type filter circuit of reliable low cost.
Background technology
Filter circuit is widely used in current electronic circuit, and it can noise pollution effectively in filtering circuit, also can be effectively anti-interference.Have diversified filter circuit in the market, but for the filter circuit in small-power lighting apparatus, lighting apparatus volume is little on the one hand, and do not allow circuit too numerous and jumbled, on the other hand, lighting apparatus does not also allow high cost, affects market acceptance level.And the filter circuit in existing lighting apparatus, structure is more complicated, and cost is higher, and reliability is poor.
Utility model content
The purpose of this utility model is to provide a kind of π type filter circuit, which solves current filter circuit construction complicated, the technical problem that cost is higher.
For achieving the above object, the technical scheme that the utility model proposes is:
A kind of π type filter circuit, it comprises: Anti-surging module, rectification module and π type filtration module; Described Anti-surging module input is electrically connected on power supply, and output is coupled to described rectification module, and the output of rectification module is coupled to described π type filtration module, wherein, π type filtration module comprises electric capacity C1, electric capacity C2, inductance L 1, magnetic bead FB1 and resistance R1, described electric capacity C1, electric capacity C2, inductance L 1 and magnetic bead FB1 form series circuit, the two ends of electric capacity C1 are connected to rectification module output, and inductance L 1 two ends are parallel with shunt resistance R1.
Wherein, described electric capacity C1 and electric capacity C2 is thin-film electro perhaps electrochemical capacitor.
Wherein, described Anti-surging module comprises fuse F1, piezo-resistance RV1; Wherein said fuse F1 is series at power output end, and described piezo-resistance RV1 is connected across between the L line of power supply and N line.
Wherein, described rectification module is the rectifier bridge be made up of four diodes.
Wherein, it is applied to power switch power source or LED light source within 10W.
Compared with prior art, π type filter circuit of the present utility model, is applicable to the small-power switching power-supply within 10W and LED light source (candle lamp, bulb lamp, ceiling light); Do not need common mode inductance, X electric capacity, Material Cost is extremely low, and reliability is high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model π type filter circuit.
Embodiment
Below with reference to accompanying drawing, elaboration is further given to the utility model.
Accompanying drawings 1, a kind of π type filter circuit of the present utility model, it comprises: Anti-surging module 100, rectification module 200 and π type filtration module 300; Anti-surging module 100 input is electrically connected on power supply, and output is coupled to described rectification module 200, and the output of rectification module 200 is coupled to π type filtration module 300.
Wherein, Anti-surging module 100 comprises fuse F1, piezo-resistance RV1; Wherein fuse F1 is series at power input, and as on power line L line in figure, piezo-resistance RV1 is connected across between power supply L line and N line.
Wherein, rectification module 200 is the rectifier bridge BD1 be made up of four diodes.
π type filtration module 300 comprises electric capacity C1, electric capacity C2, inductance L 1, magnetic bead FB1 and resistance R1, described electric capacity C1, electric capacity C2, inductance L 1 and magnetic bead FB1 form series circuit, the two ends of electric capacity C1 are connected to rectification module 200 output, and inductance L 1 two ends are parallel with shunt resistance R1.
Preferably, described electric capacity C1 and electric capacity C2 is thin-film electro perhaps electrochemical capacitor.
The filtering principle of π type filter circuit of the present utility model is as follows:
Anti-surging module 100: when input voltage has higher surge electric flux, higher surge electric flux is added on piezo-resistance RV1; When surge electric flux exceedes the absorbent energy of piezo-resistance RV1 institute, piezo-resistance RV1 is breakdown; Electric current flows through fuse F1, forms loop, is punctured by fuse F1; To reach protection components and parts below and the object of circuit.
Rectification module 200: alternating voltage, by after rectifying device BD1, converts direct voltage to.
π type filtration module 300: in the circuit of Switching Power Supply, conduct and the noise that gives off have common and different mode point.Differential mode noise can adopt π type filter circuit to suppress.Electric capacity C1, inductance L 1, electric capacity C2 form the chokes loop of high potential difference mode noise; Cause to prevent impulse current excessive inductance L 1 saturated, lost efficacy; So resistance R1 is in parallel with inductance L 1, play as inductance L 1 is shunted, prevent the saturated inefficacy of inductance L 1 and lose the effect of filtering.
Wherein, the chokes loop of electric capacity C1, magnetic bead FB1, electric capacity C2 composition low potential difference mode noise.Because FB1 is magnetic bead, negligible to the impedance of low frequency signal; Then can reach 100 Ω-600 Ω to the impedance of high-frequency signal, filtering Switching Power Supply effectively can be entrained in the various noises of electronegative potential.By these two groups of differential mode noise chokes loops, the differential mode noise produced by switching power circuit can be stoped to be mapped on extraneous common line by L, N wire spoke; Also the noise on common line can be stoped to be mapped on internal wiring by L, N wire spoke.
Further, the parameter of adjustment electric capacity C1, electric capacity C2, inductance L 1, magnetic bead FB1 can suppress the noise of different frequency range.C1, C2 can be changed into thin-film capacitor or electrochemical capacitor to meet the requirement to PF under various criterion.
π type filter circuit of the present utility model is applied to power switch power source or LED light source within 10W.Wherein, described LED light source comprises: candle lamp, GU10, bulb lamp and ceiling light.
Foregoing; be only preferred embodiment of the present utility model; not for limiting embodiment of the present utility model; those of ordinary skill in the art are according to central scope of the present utility model and spirit; can carry out corresponding flexible or amendment very easily, therefore protection range of the present utility model should be as the criterion with the protection range required by claims.
Claims (5)
1. a π type filter circuit, is characterized in that, comprising: Anti-surging module, rectification module and π type filtration module; Described Anti-surging module input is electrically connected on power supply, and output is coupled to described rectification module, and the output of rectification module is coupled to described π type filtration module, wherein, π type filtration module comprises electric capacity C1, electric capacity C2, inductance L 1, magnetic bead FB1 and resistance R1, described electric capacity C1, electric capacity C2, inductance L 1 and magnetic bead FB1 form series circuit, the two ends of electric capacity C1 are connected to rectification module output, and inductance L 1 two ends are parallel with shunt resistance R1.
2. π type filter circuit as claimed in claim 1, it is characterized in that, described electric capacity C1 and electric capacity C2 is thin-film electro perhaps electrochemical capacitor.
3. π type filter circuit as claimed in claim 1, it is characterized in that, described Anti-surging module comprises fuse F1, piezo-resistance RV1; Wherein said fuse F1 is series at power output end, and described piezo-resistance RV1 is connected across between the L line of power supply and N line.
4. π type filter circuit as claimed in claim 1, it is characterized in that, described rectification module is the rectifier bridge be made up of four diodes.
5. the π type filter circuit as described in Claims 1-4 any one, is characterized in that, it is applied to power switch power source or LED light source within 10W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520332160.6U CN204616174U (en) | 2015-05-21 | 2015-05-21 | A kind of π type filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520332160.6U CN204616174U (en) | 2015-05-21 | 2015-05-21 | A kind of π type filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204616174U true CN204616174U (en) | 2015-09-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520332160.6U Expired - Fee Related CN204616174U (en) | 2015-05-21 | 2015-05-21 | A kind of π type filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204616174U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947546A (en) * | 2017-12-21 | 2018-04-20 | 中山长虹电器有限公司 | A kind of inexpensive Switching Power Supply EMC filter circuit |
-
2015
- 2015-05-21 CN CN201520332160.6U patent/CN204616174U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947546A (en) * | 2017-12-21 | 2018-04-20 | 中山长虹电器有限公司 | A kind of inexpensive Switching Power Supply EMC filter circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150902 Termination date: 20190521 |