CN102946187B - A kind of circuit and method eliminating power supply noise - Google Patents
A kind of circuit and method eliminating power supply noise Download PDFInfo
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- CN102946187B CN102946187B CN201210488634.7A CN201210488634A CN102946187B CN 102946187 B CN102946187 B CN 102946187B CN 201210488634 A CN201210488634 A CN 201210488634A CN 102946187 B CN102946187 B CN 102946187B
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Abstract
The present invention relates to technical field of electronic equipment, particularly relate to a kind of elimination power supply noise circuit and method, at PCB? during layout, common mode inductance and magnetic bead are shared same joining zone, by changing common mode inductance or magnetic bead, with according to different power supply characteristics, timely employing common mode inductance or magnetic bead form different filter circuits, effectively can avoid the problem needing correcting after debugging, and easy to use, the space on pcb board can also be saved, thus reduce process costs.<!--1-->
Description
Technical field
The present invention relates to technical field of electronic equipment, particularly relate to a kind of circuit and the method for eliminating power supply noise.
Background technology
At present, along with the continuous increase of circuit switch device, the raising gradually of PCB design complexity, its core voltage is also in continuous reduction, and because the rate of climb of power supply noise is fast, the duration is short, voltage amplitude amplitude is high, randomness is strong, can both produce severe jamming to microcomputer and digital circuit, namely the fluctuation of supply voltage can bring serious impact to system.
In prior art, magnetic bead condenser network or common mode inductance condenser network is usually adopted to reduce or eliminate power supply noise; And when the choosing of this two kinds of filter circuits, because magnetic bead has good High frequency filter characteristic, but larger decay can be produced simultaneously, when being applied to low frequency filtering, although decay reduces, the situation of Noise enhancement can be there is because of resonance, so magnetic bead condenser network is applicable to High frequency filter simultaneously; The decay caused due to common mode inductance is smaller, and comparing magnetic bead has better EMC rejection ability, so common mode inductance condenser network is applicable to low frequency filtering.
But, the circuit characteristic of these two kinds of filter circuits all can not be considered at present at the design initial stage, and the problem needing correcting because filter circuit characteristic is uncomfortable will be run into when the later stage debugs, bring inconvenience to debugging, namely in prior art, also there is no the method for designing that can conveniently switch at any time between two kinds of different filter circuits.
Summary of the invention
For the problems referred to above that the circuit eliminating power supply noise in existing design exists, now provide a kind of and can facilitate, switch in time circuit and the method for two kinds of different filter circuits, save design space simultaneously, effectively avoid needing the problems such as correcting because of later stage debugging problem.
The object of the invention is to be achieved through the following technical solutions:
Eliminate a circuit for power supply noise, wherein, comprise power supply, switch, contact module, multiple shunt capacitance, magnetic bead module and common mode inductance module;
Described contact module is connected with described power supply by described switch, and by the capacity earth of described multiple parallel connection, and described magnetic bead module or described common mode inductance module are connected with described contact module.
The circuit of above-mentioned elimination power supply noise, wherein, described contact module comprises power end positive contact, power end negative contacts, non-power rectify polar contact and non-electrical source negative contacts, described power end positive contact is connected with described positive source by described switch, described power end negative contacts is connected with described power cathode, described non-power rectifies polar contact by multiple shunt capacitance ground connection, described non-electrical source negative contacts ground connection.
Eliminate a method for power supply noise, wherein, comprise the following steps:
A pcb board arranges a contact module, and described contact module is connected with power supply by a switch;
The common mode inductance module and magnetic bead module of mating with described contact module are set;
Described common mode inductance module or magnetic bead module are connected with described contact module, all form a filter circuit.
The method of above-mentioned elimination power supply noise, wherein, described contact module comprises power end positive contact, power end negative contacts, non-power rectify polar contact and non-electrical source negative contacts, described power end positive contact is connected with described positive source by described switch, described power end negative contacts is connected with described power cathode, described non-power rectifies polar contact by multiple shunt capacitance ground connection, described non-electrical source negative contacts ground connection.
The method of above-mentioned elimination power supply noise, wherein, described multiple shunt capacitance comprises polar capacitor.
The method of above-mentioned elimination power supply noise, wherein, electric capacity in parallel is connected with between described power end positive contact with described power end negative contacts, described non-power is rectified between polar contact and described non-electrical source negative contacts and is also connected with electric capacity, and described non-power rectifies polar contact also by the voltage stabilizing didoe ground connection of a reversal connection.
The method of above-mentioned elimination power supply noise, wherein, described power supply is connected with described switch by diode.
The method of above-mentioned elimination power supply noise, wherein, described magnetic bead inductor module comprises the first magnetic bead and the second magnetic bead.
The method of above-mentioned elimination power supply noise, wherein, when described magnetic bead module is connected with described contact module, two contacts of described first magnetic bead are rectified polar contact with described power end positive contact and described non-power respectively and are connected, and two contacts of described second magnetic bead are connected with described power end negative contacts and described non-electrical source negative contacts respectively.
The method of above-mentioned elimination power supply noise, wherein, four contacts of the common mode inductance in described common mode inductance module rectify polar contact with power end positive contact, power end negative contacts, non-power respectively and non-electrical source negative contacts is connected, and two contacts on the same winding of this common mode inductance are rectified polar contact with power end positive contact and non-power respectively and are connected, two contacts on another winding are connected with power end negative contacts and non-electrical source negative contacts respectively.
In sum, a kind of circuit and method eliminating power supply noise of the present invention, when PCBlayout, common mode inductance and magnetic bead are shared same joining zone, by changing common mode inductance or magnetic bead, with according to different power supply characteristics, timely employing common mode inductance or magnetic bead form different filter circuits, effectively can avoid the problem needing correcting after debugging, and easy to use, the space on pcb board can also be saved, thus reduce process costs.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of contact module in the embodiment of the present invention;
Fig. 2 is the structural representation of magnetic bead condenser network in the embodiment of the present invention;
Fig. 3 is the structural representation of common mode inductance condenser network in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described:
Fig. 1 is the electrical block diagram of contact module in the embodiment of the present invention, and Fig. 2 is the structural representation of magnetic bead condenser network in the embodiment of the present invention, and Fig. 3 is the structural representation of common mode inductance condenser network in the embodiment of the present invention.
As shown in Figure 1, a kind of circuit eliminating power supply noise of the present invention, the positive terminal comprising attaching plug J is connected with the pin 2 of interrupteur SW by diode D, the pin 1 of interrupteur SW is connected with power end positive contact S1, and be connected with power end negative contacts S3 by electric capacity C1, C2 in parallel, this negative contacts S3 is also connected with the negative pole end of attaching plug J; Non-power rectifies polar contact S2 by zener diode DZ, electric capacity C4 in parallel, electric capacity C5, polar capacitor C6 and polar capacitor C7 ground connection, and the equal ground connection of the positive pole of the negative pole of polar capacitor C6 and polar capacitor C7 and zener diode DZ; Non-electrical source negative contacts S4 ground connection, and rectify pole by electric capacity C3 with non-power and be connected.
Further, the two ends of magnetic bead FB1 are rectified polar contact S2 with power end positive contact S1 and non-power respectively and are connected, the two ends of magnetic bead FB2 are connected with power end negative contacts S3 and non-electrical source negative contacts S4 respectively, namely circuit structure is as shown in Figure 2 formed, attaching plug J is inserted in supply socket, the high-frequency filter circuit of this power supply can be formed.
Preferably, four contacts of common mode inductance L rectify polar contact S2, power end negative contacts S3 with power end positive contact S1, non-power respectively and non-electrical source negative contacts S4 is connected, namely circuit structure is as shown in Figure 3 formed, attaching plug J is inserted in supply socket, the low-frequency filter circuit of this power supply can be formed; Wherein, two contacts on the same winding of this common mode inductance L are rectified polar contact S2 with power end positive contact S and non-power respectively and are connected, and two contacts on another winding are connected with power end negative contacts S3 and non-electrical source negative contacts S4 respectively.
Engineer, according to above-mentioned circuit connecting relation, carries out layout design (PCBlayout) to foregoing circuit, by foregoing circuit layout on a pcb board, and carries out different encapsulation to magnetic bead FB1, FB2 and common mode inductance L; For the encapsulation that magnetic bead FB1, FB2 are different with common mode inductance L, the reserved area of space of output of the interrupteur SW on pcb board, make this area of space can meet magnetic bead FB1, FB2 after encapsulation or the putting of common mode inductance L simultaneously, and the contact be connected with other circuit devcies is set in this area of space, this contact can be connected with the contact of magnetic bead FB1, FB2 after encapsulation or common mode inductance L respectively; When magnetic bead FB1, FB2 after encapsulation are placed in this area of space, by being connected to form the magnetic bead capacitor filter of power supply with corresponding contact, and when the common mode inductance L after encapsulation is placed in this area of space, during by connecting with corresponding contact, form the common mode inductance capacitor filter of power supply.
In sum, a kind of Method and circuits eliminating power supply noise of the present invention, when PCBlayout, common mode inductance and magnetic bead are shared same joining zone, by changing common mode inductance or magnetic bead, with according to different power supply characteristics, timely employing common mode inductance or magnetic bead form different filter circuits, effectively can avoid the problem needing correcting after debugging, and easy to use, the space on pcb board can also be saved, thus reduce process costs.
By illustrating and accompanying drawing, giving the exemplary embodiments of the ad hoc structure of embodiment, based on the present invention's spirit, also can do other conversion.Although foregoing invention proposes existing preferred embodiment, but these contents are not as limitation.
For a person skilled in the art, after reading above-mentioned explanation, various changes and modifications undoubtedly will be apparent.Therefore, appending claims should regard the whole change and correction of containing true intention of the present invention and scope as.In Claims scope, the scope of any and all equivalences and content, all should think and still belong to the intent and scope of the invention.
Claims (8)
1. eliminate a circuit for power supply noise, be applied in PCB circuit design, it is characterized in that, comprise power supply, switch, contact module, multiple shunt capacitance, magnetic bead module and common mode inductance module;
Described contact module is connected with described power supply by described switch, and by described multiple shunt capacitance ground connection, and described magnetic bead module or described common mode inductance module are connected with described contact module; And
Described contact module comprises power end positive contact, power end negative contacts, non-power rectify polar contact and non-electrical source negative contacts, described power end positive contact is connected with described positive source by described switch, described power end negative contacts is connected with described power cathode, described non-power rectifies polar contact by multiple shunt capacitance ground connection, described non-electrical source negative contacts ground connection.
2. eliminate a method for power supply noise, be applied in PCB circuit design, it is characterized in that, comprise the following steps:
A pcb board arranges a contact module, and described contact module is connected with power supply by a switch;
The common mode inductance module and magnetic bead module of mating with described contact module are set;
Described common mode inductance module or described magnetic bead module are connected with described contact module, form a filter circuit; And
Described contact module comprises power end positive contact, power end negative contacts, non-power rectify polar contact and non-electrical source negative contacts, described power end positive contact is connected with described positive source by described switch, described power end negative contacts is connected with described power cathode, described non-power rectifies polar contact by multiple shunt capacitance ground connection, described non-electrical source negative contacts ground connection.
3. the method for elimination power supply noise according to claim 2, is characterized in that, described multiple shunt capacitance comprises polar capacitor.
4. the method for elimination power supply noise according to claim 2, it is characterized in that, electric capacity in parallel is connected with between described power end positive contact with described power end negative contacts, described non-power is rectified between polar contact and described non-electrical source negative contacts and is also connected with electric capacity, and described non-power rectifies polar contact also by the voltage stabilizing didoe ground connection of a reversal connection.
5. the method for elimination power supply noise according to claim 2, is characterized in that, described power supply is connected with described switch by diode.
6. the method for elimination power supply noise according to claim 2, is characterized in that, described magnetic bead module comprises the first magnetic bead and the second magnetic bead.
7. the method for elimination power supply noise according to claim 6, it is characterized in that, when described magnetic bead module is connected with described contact module, two contacts of described first magnetic bead are rectified polar contact with described power end positive contact and described non-power respectively and are connected, and two contacts of described second magnetic bead are connected with described power end negative contacts and described non-electrical source negative contacts respectively.
8. the method for elimination power supply noise according to claim 2, it is characterized in that, four contacts of the common mode inductance in described common mode inductance module rectify polar contact with power end positive contact, power end negative contacts, non-power respectively and non-electrical source negative contacts is connected, and two contacts on the same winding of this common mode inductance are rectified polar contact with power end positive contact and non-power respectively and are connected, two contacts on another winding are connected with power end negative contacts and non-electrical source negative contacts respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210488634.7A CN102946187B (en) | 2012-11-27 | 2012-11-27 | A kind of circuit and method eliminating power supply noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210488634.7A CN102946187B (en) | 2012-11-27 | 2012-11-27 | A kind of circuit and method eliminating power supply noise |
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| Publication Number | Publication Date |
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| CN102946187A CN102946187A (en) | 2013-02-27 |
| CN102946187B true CN102946187B (en) | 2015-11-25 |
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| CN201210488634.7A Active CN102946187B (en) | 2012-11-27 | 2012-11-27 | A kind of circuit and method eliminating power supply noise |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2768315Y (en) * | 2005-01-07 | 2006-03-29 | 华为技术有限公司 | Filter circuit |
| CN201113931Y (en) * | 2007-07-30 | 2008-09-10 | 顺泰电子科技股份有限公司 | Modularized filter |
| CN201656921U (en) * | 2010-02-26 | 2010-11-24 | 四川长虹电器股份有限公司 | Filter circuit |
| CN202334330U (en) * | 2011-11-17 | 2012-07-11 | 成都可为科技发展有限公司 | Rectified output circuit for switching power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315760A (en) * | 2010-07-09 | 2012-01-11 | 鸿富锦精密工业（深圳）有限公司 | Fire-wire interface power supply circuit |
-
2012
- 2012-11-27 CN CN201210488634.7A patent/CN102946187B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2768315Y (en) * | 2005-01-07 | 2006-03-29 | 华为技术有限公司 | Filter circuit |
| CN201113931Y (en) * | 2007-07-30 | 2008-09-10 | 顺泰电子科技股份有限公司 | Modularized filter |
| CN201656921U (en) * | 2010-02-26 | 2010-11-24 | 四川长虹电器股份有限公司 | Filter circuit |
| CN202334330U (en) * | 2011-11-17 | 2012-07-11 | 成都可为科技发展有限公司 | Rectified output circuit for switching power supply |
Non-Patent Citations (1)
| Title |
|---|
| AFE设计技巧;陈哲;《豆丁文档》;20111204;图表4 * |
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