CN201054568Y - A ground circuit for restraining electromagnetic interference from power - Google Patents
A ground circuit for restraining electromagnetic interference from power Download PDFInfo
- Publication number
- CN201054568Y CN201054568Y CNU2006201491533U CN200620149153U CN201054568Y CN 201054568 Y CN201054568 Y CN 201054568Y CN U2006201491533 U CNU2006201491533 U CN U2006201491533U CN 200620149153 U CN200620149153 U CN 200620149153U CN 201054568 Y CN201054568 Y CN 201054568Y
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- ground
- filter
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- magnetic resistance
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Abstract
The utility model discloses a grounding circuit restraining power source electromagnetic interference, which comprises a sub 48V power source input interface, a filter circuit, a digital work ground, a protecting ground interface and a magnetic resistance capacitance isolating circuit. The magnetic resistance capacitance isolating circuit consists of a grounding isolating magnetic resistance and a ground wire filter capacitance, which is connected between the digital work ground and the protecting ground. The grounding circuit can effectively isolate various instant interferences on the ground wire out of the apparatus, such as the interferences of the static and the lightening strike, and greatly improves the conducting emitting and radiating emitting performance of the apparatus power source interface at the same time. The direct current impedance of the grounding isolating magnetic resistance is very small without causing influence to the ground electric potential of the apparatus.
Description
Technical field
The utility model relates to a kind of communication apparatus power circuit, relates in particular to the power ground circuit with anti-emi characteristics.
Background technology
Along with the development of modern communication, communication product has been applied to our various fields in life.The power supply of the power supply of communication apparatus is the important step in the product design, and the quality of power supply various aspects of performance directly influences the performance of equipment.And the anti-electromagnetic interference (EMI) ability of device power supply (DPS) has become the index that each communication product must reach.In the product design in the past, this respect is not subjected to enough attention.Raising along with the internationalization and the design level of communication product, the quality of the EMI characteristic of communication product has reflected the quality and the stability of product, and whether the EMI characteristic of device power supply (DPS) is up to standard, have influence on the technical indicator of entire equipment especially, directly had influence on the market access and the occupation rate of product.
Power circuit is the most basic circuit in the communication product, is that each equipment all possesses.The communication product power supply adopts-48V direct current supply usually;-48V is in equipment; through after the filtering; pass through DC-DC direct-current switch power supply modular converter again; convert-48V in the equipment required voltages such as 3.3V, 2.5V of device; draw after also being connected to power panel earlier on digital operation ground in the equipment and protection ground.The direct-current switch power supply modular converter has the transformer coupling isolated non-isolated with inductive energy storage usually, Switching Power Supply is because of being operated in nonlinear on off state, the width of cloth that power supply itself produces is penetrated and is conducted just very big, by simple filtering and ground connection way, be difficult to reach the anti-electromagnetic interference (EMI) requirement of product, and the width of cloth that how to suppress the communication product power supply is penetrated emission, improves its conduction immunity characteristic, is the content that we pay close attention to always.
Figure 1 shows that existing equipment power ground circuit diagram.Equipment is required-the 48V power supply imported by power panel, through after the Filtering Processing, delivers to backboard in power panel, again by backboard to each veneer.The ground wire of each veneer has digitally, simulates ground, protection ground respectively, and in equipment, we do not distinguish digitally and simulation ground, the unified digital operation ground that connects, draw separately on protection ground, outside equipment digitally, protection ground carries out single-point grounding.Along with communication product single board integrated level and signal rate are more and more higher, the also corresponding increase of its ground noise.And the internationalization of communication product is higher to the anti-electromagnetic interference performance requirement of equipment, and simple ground connection way outside equipment can not satisfy the anti-electromagnetic interference requirement of some equipment like this.
The main deficiency of the single-point grounding circuit of equipment is at present: do not possess the ability of anti-electromagnetic interference, can not effectively eliminate the conduction emission and the width of cloth and penetrate the emission interference.
Summary of the invention
The purpose of this utility model has mainly provided the power ground circuit of a concrete anti-electromagnetic interference capability, reduces the conduction emission and the width of cloth of communication product power supply effectively and penetrates the emission index.
In order to realize above purpose, the utility model provides a kind of power ground circuit with Electro Magnetic Compatibility, comprises-the 48V power input interface filter circuit, digital operation ground, protection ground interface, magnetic resistance electric capacity buffer circuit; Magnetic resistance electric capacity buffer circuit isolates magnetic resistance by ground connection and the ground wire filter capacitor constitutes, and is connected between digital operation ground and the protection ground.
Filter circuit is made up of power-supply filter, and power-supply filter is selected the electromagnetic interface filter with electromagnetic immunity performance for use, will help to improve the ability of the electromagnetic interference that the power ground circuit suppresses.
Compared with prior art, the utility model digital operation ground, protection ground and casing ground is at device interior short circuit not, single-point grounding equipment outside, digital operation ground and protection ground is direct short circuit, between pass through a ground connection isolation magnetic resistance and be connected with the ground wire filter capacitor.Ground connection is isolated the filter circuit of magnetic resistance and ground wire filter capacitor composition, and effectively the various glitch on the outer ground wire of xegregating unit as the interference of static and thunderbolt, simultaneously, have improved device power supply (DPS) interface conduction emission widely and penetrated emitting performance with the width of cloth.And the dc impedance of ground connection isolation magnetic resistance is very little, and the equipment earth potential is not impacted.
In a word, by the acting in conjunction of above each several part circuit, can improve the anti-emi characteristics of communication product power interface effectively, thereby improve its reliability.
Description of drawings
Fig. 1 is an existing equipment power ground circuit diagram.
Fig. 2 is the power ground circuit block diagram with anti-electromagnetic interference.
Fig. 3 is the schematic diagram with power ground circuit of anti-electromagnetic interference.
Embodiment
Below in conjunction with accompanying drawing and the concrete circuit of implementing the utility model is described in further detail.
As shown in Figure 2, the utility model provides a kind of power ground circuit with Electro Magnetic Compatibility, comprises-the 48V power input interface filter circuit, digital operation ground, protection ground interface, magnetic resistance electric capacity buffer circuit.Magnetic resistance electric capacity buffer circuit isolates magnetic resistance by ground connection and the ground wire filter capacitor constitutes, and is connected between digital operation ground and the protection ground.
As shown in Figure 3, ground connection isolation magnetic resistance L is connected on the digital operation ground lead-out wire; The ground wire filter capacitor comprises filter capacitor C1 and filter capacitor C2, is connected in parallel between digital operation ground and the protection ground, forms magnetic resistance electric capacity buffer circuit jointly.
The power-supply filter of filter circuit is selected the electromagnetic interface filter with electromagnetic immunity performance for use, rated voltage 80VDC, and rated current 20A will help to improve the ability of the electromagnetic interference that the power ground circuit suppresses like this.
Ground connection is isolated magnetic resistance L and is selected the EMI magnetic resistance for use, impedance 45 Europe when the 25MHz frequency, and impedance is 95 Europe during 100MHz; Filter capacitor C1 is 0.1 μ F, and filter capacitor C2 is 0.01 μ F.
The utility model scheme further is described below:
Power interface by-48V input ,-48V ground, digital operation ground, protection ground and casing ground forms;-48V power supply is given the power supply of the veneer in the equipment by backboard after the filtering of EMI filter capacitor; lead to digital operation in the equipment power panel; protection ground is mainly interior anti-lightning strike, the anti-static protection circuit of equipment earth-return is provided; protection ground also causes power panel, is drawn by power panel and connects the earth.On power panel; protection ground and the not direct short circuit in digital operation ground; digital operation ground isolates magnetic resistance L, 0.1 a μ F capacitor C 1 and one 0.01 a μ capacitor C 2 with indirect one the 45 Europe ground connection in protection ground; the filter circuit of Zu Chenging thus; digital place of working and protection ground are isolated, can improve the anti-electromagnetic interference capability of equipment effectively.
Compared with prior art; the utility model digital operation ground, protection ground and casing ground are at device interior short circuit not; single-point grounding outside equipment, digital operation ground and protection ground be direct short circuit, between isolate magnetic resistance L by a ground connection and be connected with filter capacitor C1, C2.Ground connection is isolated the effectively various glitch on the outer ground wire of xegregating unit of magnetic resistance L and filter capacitor C1, C2, as the interference of static and thunderbolt, simultaneously, has improved widely that the conduction of device power supply (DPS) interface is launched and the width of cloth is penetrated emitting performance.And the dc impedance of ground connection isolation magnetic resistance L is very little, and the equipment earth potential is not impacted.
In a word, by the acting in conjunction of above each several part circuit, can improve the anti-emi characteristics of communication product power interface effectively, thereby improve its reliability.
Claims (5)
1. an earthed circuit that suppresses the power supply electromagnetic interference is characterized in that comprising-the 48V power input interface, filter circuit, digital operation ground, protection ground interface, magnetic resistance electric capacity buffer circuit;
Magnetic resistance electric capacity buffer circuit isolates magnetic resistance by ground connection and the ground wire filter capacitor constitutes, and is connected between digital operation ground and the protection ground.
2. earthed circuit according to claim 1 is characterized in that: the ground wire filter capacitor comprises the first filter capacitor C1 and the second filter capacitor C2; The first filter capacitor C1 and the second filter capacitor C2 are connected in parallel between digital operation ground and the protection ground.
3. earthed circuit according to claim 1 is characterized in that: the power-supply filter of filter circuit is the electromagnetic interface filter with electromagnetic immunity performance.
4. earthed circuit according to claim 2 is characterized in that: the power-supply filter of filter circuit is the electromagnetic interface filter with electromagnetic immunity performance.
5. earthed circuit according to claim 4 is characterized in that: described power-supply filter rated voltage is 80VDC, and rated current is 20A; It is the EMI magnetic resistance that ground connection is isolated magnetic resistance L, impedance 45 Europe when the 25MHz frequency, and impedance is 95 Europe during 100MHz; Filter capacitor C1 is 0.1 μ F, and filter capacitor C2 is 0.01 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201491533U CN201054568Y (en) | 2006-10-27 | 2006-10-27 | A ground circuit for restraining electromagnetic interference from power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201491533U CN201054568Y (en) | 2006-10-27 | 2006-10-27 | A ground circuit for restraining electromagnetic interference from power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201054568Y true CN201054568Y (en) | 2008-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006201491533U Expired - Fee Related CN201054568Y (en) | 2006-10-27 | 2006-10-27 | A ground circuit for restraining electromagnetic interference from power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201054568Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101945565A (en) * | 2010-09-26 | 2011-01-12 | 镇江恒驰科技有限公司 | Anti-interference grounding method of electronic controller of automobile |
| CN104573222A (en) * | 2015-01-05 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Active crystal oscillator wire arrangement method for reducing EMI risk |
| CN107072131A (en) * | 2017-06-27 | 2017-08-18 | 苏州交运电子科技有限公司 | Electronic equipment static discharge solution and apply its electronic equipment |
| CN107529022A (en) * | 2016-06-21 | 2017-12-29 | 中兴通讯股份有限公司 | AV interface circuits and its manufacture method |
| CN110932534A (en) * | 2019-11-29 | 2020-03-27 | 中国电子科技集团公司第十三研究所 | Spurious suppression device, frequency source and electronic equipment |
-
2006
- 2006-10-27 CN CNU2006201491533U patent/CN201054568Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101945565A (en) * | 2010-09-26 | 2011-01-12 | 镇江恒驰科技有限公司 | Anti-interference grounding method of electronic controller of automobile |
| CN101945565B (en) * | 2010-09-26 | 2012-10-10 | 镇江恒驰科技有限公司 | Anti-interference grounding method of electronic controller of automobile |
| CN104573222A (en) * | 2015-01-05 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Active crystal oscillator wire arrangement method for reducing EMI risk |
| CN107529022A (en) * | 2016-06-21 | 2017-12-29 | 中兴通讯股份有限公司 | AV interface circuits and its manufacture method |
| CN107529022B (en) * | 2016-06-21 | 2021-12-07 | 中兴通讯股份有限公司 | AV interface circuit and method for manufacturing the same |
| CN107072131A (en) * | 2017-06-27 | 2017-08-18 | 苏州交运电子科技有限公司 | Electronic equipment static discharge solution and apply its electronic equipment |
| CN110932534A (en) * | 2019-11-29 | 2020-03-27 | 中国电子科技集团公司第十三研究所 | Spurious suppression device, frequency source and electronic equipment |
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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 |
Granted publication date: 20080430 Termination date: 20141027 |
|
| EXPY | Termination of patent right or utility model |