CN206038807U - Electromagnetic compatibility radiated emission test optimization circuit and device - Google Patents
Electromagnetic compatibility radiated emission test optimization circuit and device Download PDFInfo
- Publication number
- CN206038807U CN206038807U CN201621063277.XU CN201621063277U CN206038807U CN 206038807 U CN206038807 U CN 206038807U CN 201621063277 U CN201621063277 U CN 201621063277U CN 206038807 U CN206038807 U CN 206038807U
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- Prior art keywords
- electric capacity
- electromagnetic compatibility
- emission test
- radiation emission
- usb interface
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Abstract
The utility model discloses an electromagnetic compatibility radiated emission test optimization circuit and device, wherein, a filter module of the spurious signal that electromagnetic compatibility radiated emission test optimization circuit includes the USB interface, produced when being used for filtering data transmission, be used for filtering input voltage interfering signal's the 2nd filter module and be used for limiting the voltage protection module of input voltage size, a filter module, the 2nd filter module and voltage protection module all connect the USB interface, through increasing the spurious signal that a filter module produced can effectively filtering difference signal transmission the time, put forward the success rate of high radiation transmission, and need not to increase multilayer FPC and result in the material cost -push.
Description
Technical field
This utility model is related to technical field of electromagnetic compatibility measurement, and more particularly to a kind of electromagnetic compatibility radiation emission test is excellent
Change circuit and device.
Background technology
The EMC tests of essentially all of mobile phone/flat board/data card/vehicle module are emc testing item at present
In all include radiation-emitting（Radiated emission, follow-up abbreviation RE）Test.RE tests wherein have the test pattern to be
USB data transmission pattern, many projects are as USB cable shieldings are bad and connection mainboard and platelet at present（USB connector
On platelet）FPC shield effectivenesses it is bad wait a variety of causes, cause RE test crash, and the USB cable for using material good
Or the FPC of more layers can improve Material Cost.
Thus prior art could be improved and improve.
Utility model content
In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of electromagnetic compatibility radiation to send out
Test optimization circuit and device is penetrated, radiation emission test result can be optimized and do not increased Material Cost especially.
In order to achieve the above object, this utility model takes technical scheme below：
A kind of electromagnetic compatibility radiation emission test optimizes circuit, and which includes USB interface, produce during data transfer for filtering
The first filtration module of spurious signal, the second filtration module for filtering input voltage interference signal and for limiting input
The voltage protection module of voltage swing, first filtration module, the second filtration module and voltage protection module are all connected with USB and connect
Mouthful.
In described electromagnetic compatibility radiation emission test optimization circuit, first filtration module includes the first electric capacity and the
Two electric capacity, one end of first electric capacity connect the D- ends of USB interface, the other end ground connection of first electric capacity；Described second
One end of electric capacity connects the D+ ends of USB interface, the other end ground connection of second electric capacity.
In described electromagnetic compatibility radiation emission test optimization circuit, second filtration module include the 3rd electric capacity, the
Four electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity and first resistor, one end of the 3rd electric capacity, the one of the 4th electric capacity
End, one end of the 5th electric capacity, one end of the 6th electric capacity, one end of the 7th electric capacity and one end of first resistor are all connected with USB interface
VBUS ends；The other end of the 3rd electric capacity, the other end of the 4th electric capacity, the other end of the 5th electric capacity, the 6th electric capacity it is another
The other end of one end, the other end of the 7th electric capacity and first resistor is grounded.
In described electromagnetic compatibility radiation emission test optimization circuit, the voltage protection module is included for overvoltage protection
Transient voltage protection location and the electrostatic discharge (ESD) protection unit for electrostatic protection, the transient voltage protection location and electrostatic
Discharge prevention unit is all connected with USB interface.
In described electromagnetic compatibility radiation emission test optimization circuit, the transient voltage protection location includes that transient state suppresses
Diode, one end of the Transient Suppression Diode connect the VBUS ends of USB interface, the other end of the Transient Suppression Diode
Ground connection.
In described electromagnetic compatibility radiation emission test optimization circuit, the electrostatic discharge (ESD) protection unit includes that ESD is protected
Diode, one end of the ESD protection diodes connect the VBUS ends of USB interface, another termination of the ESD protection diodes
Ground.
In described electromagnetic compatibility radiation emission test optimization circuit, the capacitance scope of first electric capacity and the second electric capacity
It is 1.8pF-4.7pF.
In described electromagnetic compatibility radiation emission test optimization circuit, the model of the Transient Suppression Diode
PTVSHC1DF7VB。
In described electromagnetic compatibility radiation emission test optimization circuit, the model of the ESD protection diodes
PESD16VX1UL。
A kind of electromagnetic compatibility radiation emission test device, including housing, is provided with pcb board in the housing, wherein, described
Electromagnetic compatibility radiation emission test optimization circuit as above is provided with pcb board.
Compared to prior art, the electromagnetic compatibility radiation emission test that this utility model is provided optimizes in circuit and device,
Electromagnetic compatibility radiation emission test optimization circuit includes USB interface, for filtering the spurious signal produced during data transfer
The first filtration module, the second filtration module for filtering input voltage interference signal and for limiting input voltage size
Voltage protection module, first filtration module, the second filtration module and voltage protection module are all connected with USB interface, by increasing
Plus first filtration module can effectively filter out the spurious signal produced during differential signal transmission, improve the success of radiation emission test
Rate, and need not increase multi-layer FPC causes Material Cost to increase.
Description of the drawings
Fig. 1 optimizes the circuit diagram of circuit for the electromagnetic compatibility radiation emission test that this utility model is provided.
Specific embodiment
This utility model provides a kind of electromagnetic compatibility radiation emission test optimization circuit and device, can optimize radiation-emitting survey
Test result and Material Cost is not especially increased.
For making the purpose of this utility model, technical scheme and effect clearer, clear and definite, develop simultaneously enforcement referring to the drawings
Example is further described to this utility model.It should be appreciated that specific embodiment described herein is only to explain this practicality
It is new, it is not used to limit this utility model.
Refer to Fig. 1, the electromagnetic compatibility radiation emission test optimization circuit that this utility model is provided include USB interface J1,
For filter the spurious signal produced during data transfer the first filtration module 10, for filter input voltage interference signal
Two filtration modules 20 and the voltage protection module 30 for limiting input voltage size, first filtration module 10, second are filtered
Ripple module 20 and voltage protection module 30 are all connected with USB interface J1, can effectively filter out difference by increasing by the first filtration module 10
The spurious signal produced during signal transmission, improves the success rate of radiation-emitting, and need not increase multi-layer FPC causes Material Cost to increase
Plus.
Specifically, first filtration module 10 includes the first electric capacity C1 and the second electric capacity C2, the first electric capacity C1's
One end connects the D- ends of USB interface J1, the other end ground connection of the first electric capacity C1；One end connection of the second electric capacity C2
The D+ ends of USB interface J1, the other end ground connection of the second electric capacity C2.As shown in figure 1, when USB line carries out data transmission, being logical
Cross USB_HS_D_M and USB_HS_D_P this to differential lines as path.Due to the speed of data transfer it is very high, spurious signal
It is easy to radiate by USB line.Cause RE test crash, and the electromagnetic compatibility radiation emission test that this utility model is provided
Optimization circuit increases the electric capacity for being parallel to ground for a pair in differential lines, effectively filters out the spuious letter produced during differential signal transmission
Number, and multi-layer FPC need not be increased, greatly reduce the cost of material increase.
Further, it is for guaranteeing the capacitance scope of filter effect, the first electric capacity C1 and the second electric capacity C2
1.8pF-4.7pF, it is to avoid the excessive impact data transfer of capacitance, specifically can select preferred value, such as 2.5pF according to actual requirement.
The first electric capacity C1 and the second electric capacity C2 preferably has the electric capacity of temperature-compensating property using murata COG series in addition, can
The impact that the adaptability of temperature not enough brought for other elements and compensate, improve the stability of circuit.
Preferably, second filtration module 20 includes the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric
Hold C6, the 7th electric capacity C7 and first resistor R1, one end of the 3rd electric capacity C3, one end of the 4th electric capacity C4, the 5th electric capacity C5
One end, one end of the 6th electric capacity C6, one end of the 7th electric capacity C7 and one end of first resistor R1 be all connected with USB interface J1
VBUS ends；The other end of the 3rd electric capacity C3, the other end of the 4th electric capacity C4, the other end of the 5th electric capacity C5, the 6th electric capacity
The other end of the other end of C6, the other end of the 7th electric capacity C7 and first resistor R1 is grounded, by the 3rd electric capacity C3,
Four electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6 and the 7th electric capacity C7 filter the interference signal in input voltage, improve input electricity
The stability of pressure.
Please continue to refer to Fig. 1, the voltage protection module 30 includes the transient voltage protection location 301 for overvoltage protection
With the electrostatic discharge (ESD) protection unit 302 for electrostatic protection, the transient voltage protection location 301 and electrostatic discharge (ESD) protection unit
302 are all connected with USB interface J1, by being respectively provided with transient voltage protection location 301 and electrostatic discharge (ESD) protection unit 302, effectively
Ensure circuit multiple voltage regulation under can input temp running voltage, protect operating circuit not to be damaged.
Wherein, the transient voltage protection location 301 includes Transient Suppression Diode TVS1, the Transient Suppression Diode
One end of TVS1 connects the VBUS ends of USB interface J1, and the other end ground connection of the Transient Suppression Diode TVS1 works as transient voltage
More than circuit normal working voltage when, Transient Suppression Diode TVS1 occur snowslide, provide path for transient current, make inside
Circuit exempt from overvoltage puncture or the overheated of excess electric current is burnt, make voltage clamp in a predetermined value, effectively protect
Precision components in circuit, from the damage of various surge pulses.Specifically, the model of the Transient Suppression Diode TVS1
For PTVSHC1DF7VB, certainly, other other models Transient Suppression Diode TVS1 with phase same-action, this reality may also be employed
This is not construed as limiting with new.
The electrostatic discharge (ESD) protection unit 302 includes ESD protection diodes ESD1, ESD protection diodes ESD1
One end connects the VBUS ends of USB interface J1, the other end ground connection of ESD protection diodes ESD1.Due to integrated circuit dimensions
Reduction so that device easily by ESD voltage, the i.e. infringement of Electro-static Driven Comb voltage, by increasing ESD protection diodes
ESD1, effectively by voltage clamp in level lower, it is ensured that the high reliability of circuit.Specifically, the ESD protection diodes
Model PESD16VX1UL of ESD1, certainly, may also be employed other other model ESD protection diodes with phase same-action
ESD1, this utility model are not construed as limiting to this.
This utility model correspondingly provides a kind of electromagnetic compatibility radiation emission test device, including housing, in the housing
Pcb board is provided with, wherein, electromagnetic compatibility radiation emission test optimization circuit as above on the pcb board, is provided with, due to
Electromagnetic compatibility radiation emission test optimization circuit is described in detail above, has not been described further herein.
When being embodied as, in PCB hardware arrangements, the first electric capacity C1 and the second electric capacity C2 should close proximity to USB interface J1,
Do not affect the transmission performance of USB line, the ground pin feet of the first electric capacity C1 and the second electric capacity C2 have on electric capacity for ensureing this simultaneously
Identical as far as possible refers to ground level, connect up upper two capacitively pin feet using short ground wire to being connect with title mode or single-point
The mode on ground is connected to mainly, in addition, the cabling of USB_HS_D_M and USB_HS_D_P takes line bond pad, it is to avoid occur
Anchoring wire, affects the signal integrity of USB differential pairs.
In sum, the electromagnetic compatibility radiation emission test that this utility model is provided optimizes in circuit and device, the electricity
Magnetic compatibility radiation emission test optimization circuit include USB interface, for filter the spurious signal produced during data transfer first
Filtration module, the second filtration module for filtering input voltage interference signal and the voltage for limiting input voltage size are protected
Shield module, first filtration module, the second filtration module and voltage protection module are all connected with USB interface, by increasing by first
Filtration module can effectively filter out the spurious signal produced during differential signal transmission, improve the success rate of radiation-emitting, and without the need for increasing
Plus multi-layer FPC causes Material Cost to increase.
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
Its utility model design in addition equivalent or change, and all these changes or replace should all belong to appended by this utility model
Scope of the claims.
Claims (10)
1. a kind of electromagnetic compatibility radiation emission test optimizes circuit, it is characterised in that pass including USB interface, for filtering data
First filtration module of the spurious signal produced when defeated, the second filtration module for filtering input voltage interference signal and it is used for
The voltage protection module of input voltage size is limited, first filtration module, the second filtration module and voltage protection module are equal
Connection USB interface.
2. electromagnetic compatibility radiation emission test according to claim 1 optimizes circuit, it is characterised in that first filtering
Module includes the first electric capacity and the second electric capacity, and one end of first electric capacity connects the D- ends of USB interface, first electric capacity
The other end is grounded；One end of second electric capacity connects the D+ ends of USB interface, the other end ground connection of second electric capacity.
3. electromagnetic compatibility radiation emission test according to claim 1 optimizes circuit, it is characterised in that second filtering
Module includes the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity and first resistor, the 3rd electric capacity
One end, one end of the 4th electric capacity, one end of the 5th electric capacity, one end of the 6th electric capacity, one end of the 7th electric capacity and first resistor
One end is all connected with the VBUS ends of USB interface；The other end of the 3rd electric capacity, the other end of the 4th electric capacity, the 5th electric capacity it is another
One end, the other end of the 6th electric capacity, the other end of the 7th electric capacity and the other end of first resistor are grounded.
4. electromagnetic compatibility radiation emission test according to claim 1 optimizes circuit, it is characterised in that the voltage protection
Module includes the transient voltage protection location for overvoltage protection and the electrostatic discharge (ESD) protection unit for electrostatic protection, the wink
State voltage protection unit and electrostatic discharge (ESD) protection unit are all connected with USB interface.
5. electromagnetic compatibility radiation emission test according to claim 4 optimizes circuit, it is characterised in that the transient voltage
Protection location includes Transient Suppression Diode, and one end of the Transient Suppression Diode connects the VBUS ends of USB interface, the wink
State suppresses the other end ground connection of diode.
6. electromagnetic compatibility radiation emission test according to claim 4 optimizes circuit, it is characterised in that the static discharge
Protection location includes ESD protection diodes, and one end of the ESD protection diodes connects the VBUS ends of USB interface, the ESD
The other end ground connection of protection diode.
7. electromagnetic compatibility radiation emission test according to claim 2 optimizes circuit, it is characterised in that first electric capacity
1.8pF-4.7pF is with the capacitance scope of the second electric capacity.
8. electromagnetic compatibility radiation emission test according to claim 5 optimizes circuit, it is characterised in that the transient state suppresses
Model PTVSHC1DF7VB of diode.
9. electromagnetic compatibility radiation emission test according to claim 6 optimizes circuit, it is characterised in that the ESD protections
Model PESD16VX1UL of diode.
10. a kind of electromagnetic compatibility radiation emission test device, including housing, is provided with pcb board in the housing, and its feature exists
In, arrange on the pcb board just like described in claim 1-9 any one electromagnetic compatibility radiation emission test optimization circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621063277.XU CN206038807U (en) | 2016-09-18 | 2016-09-18 | Electromagnetic compatibility radiated emission test optimization circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621063277.XU CN206038807U (en) | 2016-09-18 | 2016-09-18 | Electromagnetic compatibility radiated emission test optimization circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206038807U true CN206038807U (en) | 2017-03-22 |
Family
ID=58295827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621063277.XU Expired - Fee Related CN206038807U (en) | 2016-09-18 | 2016-09-18 | Electromagnetic compatibility radiated emission test optimization circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206038807U (en) |
-
2016
- 2016-09-18 CN CN201621063277.XU patent/CN206038807U/en not_active Expired - Fee Related
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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: 20170322 Termination date: 20170918 |
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| CF01 | Termination of patent right due to non-payment of annual fee |