CN106382883A - Deformation detection method and device of printed circuit board (PCB) - Google Patents
Deformation detection method and device of printed circuit board (PCB) Download PDFInfo
- Publication number
- CN106382883A CN106382883A CN201610788420.XA CN201610788420A CN106382883A CN 106382883 A CN106382883 A CN 106382883A CN 201610788420 A CN201610788420 A CN 201610788420A CN 106382883 A CN106382883 A CN 106382883A
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- value
- frequency
- pcb
- pdn
- pcb board
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a deformation detection method and device of a PCB. The characteristic that PDN inductance change causes ripple change of a power supply when the PCB is deformed is used, s loop oscillator is designed in a chip to detect the frequency offset, and PCB deformation is determined according to the frequency offset. Deformation detection can be carried out needless of a mechanical trigger or sensor, the design cost of PCB detection is reduced, and available space in the PCB is saved.
Description
Technical field
The application is related to electronic technology field, more particularly, to a kind of deformation detecting method of printed circuit board and device.
Background technology
With the progress of electronic technology, increasing electronic product trends towards portability, lightweight, intellectuality, user
Also function and the service life of product are increasingly paid close attention to.In the factors of the service life of impact electronic product, usually have
User's improper use causes electronic product to be repeatedly subjected to external impacts, and then leads to structure to deform upon with internal PCB, this
The consequence of PCB repeated deformation can affect device solder joint on PCB, connecting line etc. and eventually fall out or rupture, and the final electronics that damages produces
Product.
The method of common detection PCB deformation is the small pressure triggering device using frame for movement in electronic product.
When structure or PCB send deformation, external force promotes pressure triggering to produce on off operating mode, and this state is converted into telecommunications
Number, signal identification is carried out by the detection chip on PCB.This method can detect whether PCB deforms upon, and then prompting makes
User notes taking precautions against.Also have certain methods to be to use pressure transducer, cause the pressure of pressure transducer by the deformation in structure
Whether power change deforms upon to perceive.
But, during currently extra increasing being needed to the deformation detecting method of pcb board, not only increase cost, but also
Increased the space structure of pcb board.
Content of the invention
Embodiments provide a kind of deformation detecting method of printed circuit board and device, in order to solve prior art
During the current deformation detecting method to pcb board needs extra increasing, not only increase cost, and also add pcb board
Space structure problem.
Its specific technical scheme is as follows：
A kind of deformation detecting method of printed circuit board, methods described includes：
Obtain inductance value on described printed circuit pcb board；According to described inductance value, determine corresponding work output frequency；
Determine between described work output frequency and standard frequency, whether difference is less than predetermined threshold value；
If it is determined that described pcb board is undeformed；
If not it is determined that described pcb board produces deformation.
Optionally, according to described inductor value, determine corresponding work output frequency, including：
Obtain the inductance value on power distribution network PDN；
According to described inductance value, determine the voltage ripple value in described PDN loop；
According to described voltage ripple value, determine the corresponding described work output frequency of described voltage ripple value.
Optionally, obtain the inductance value on power distribution network PDN, including：
Based on the medium on described pcb board and decoupling capacitor two ends to the circuit of chip, determine inductance on described PDN
Difference value；
Using described difference value as described inductance value.
Optionally, determine between described work output frequency and standard frequency, whether difference is less than predetermined threshold value, including：
Obtain the first frequency of the first depositor output on described PCB；
Described first frequency and the second frequency of the second depositor output on described PCB are compared whether identical.
A kind of deformation detecting device of printed circuit board, including：
Acquisition module, for obtaining inductance value on described printed circuit pcb board；According to described inductance value, determine corresponding
Work output frequency；
Processing module, for determining between described work output frequency and standard frequency, whether difference is less than predetermined threshold value；
If it is determined that described pcb board is undeformed；If not it is determined that described pcb board produces deformation.
Optionally, described processing module, specifically for obtaining the inductance value on power distribution network PDN；According to described electricity
Inductance value, determines the voltage ripple value in described PDN loop；According to described voltage ripple value, determine that described voltage ripple value corresponds to
Described work output frequency.
Optionally, described acquisition module, specifically for based on the medium on described pcb board and decoupling capacitor two ends to core
The circuit of piece, determines the difference value of inductance on described PDN；Using described difference value as described inductance value.
Optionally, described processing module, specifically for obtaining the first frequency of the first depositor output on described PCB；
Described first frequency and the second frequency of the second depositor output on described PCB are compared whether identical.
In method provided by the present invention, it is possible to use when PCB deforms upon, PDN net inductive value changes cause power supply
The feature of ripple change, to detect frequency shift (FS) in core on chip designs loop oscillator, thus determining PCB according to frequency shift (FS)
Deformation.So carry out shape changing detection without mechanical activator or sensor, not only reduce the design cost of PCB detection,
And also save the free space on pcb board.
Brief description
Fig. 1 is a kind of flow chart of the detection method of printed circuit board deformation in the embodiment of the present invention；
Fig. 2 is the structural representation of pcb board in the embodiment of the present invention；
Fig. 3 is the structural representation that in the embodiment of the present invention, pcb board produces deformation；
Fig. 4 is the schematic diagram of embodiment of the present invention medium frequency comparative structure；
Fig. 5 is a kind of structural representation of the detection means of printed circuit board deformation in the embodiment of the present invention.
Specific embodiment
Below by accompanying drawing and technical solution of the present invention is described in detail specific embodiment it will be appreciated that this
Particular technique feature in bright embodiment and embodiment is the explanation to technical solution of the present invention, rather than limits, not
In the case of conflict, the particular technique feature in the embodiment of the present invention and embodiment can be mutually combined.
It is illustrated in figure 1 a kind of flow chart of the detection method of printed circuit board deformation, the method in the embodiment of the present invention
Including：
S101, obtains inductance value on described printed circuit pcb board；According to inductance value, determine corresponding work output frequency；
S102, determines between work output frequency and standard frequency, whether difference is less than predetermined threshold value；
If so, then execute S103；If it is not, then executing S104.
S103, determines that pcb board is undeformed；
S104, determines that pcb board produces deformation.
Specifically, in embodiments of the present invention, the concrete structure of pcb board is as shown in Fig. 2 general pcb board is divided into two-layer,
One layer is ground plane, and another layer is capacitor layers, is provided with electric capacity, integrated circuit FPGA on the ground plane of pcb board.
In pcb board, when pcb board deforms upon so that the inductance value of PDN changes, and in inductance value and PDN
There is following relational expression in voltage ripple again：
Vripple=ItransientZPDN
Wherein, VrippleVoltage ripple, ZPDNFor inductance value, ItransientFor constant.
Knowable to above-mentioned formula, voltage ripple is proportional with inductance value.
And ZPDNRelated to the total inductance value in PDN network.When PCB deforms upon, total inductance value is led to become
The main cause changed has two aspects：
1st, pcb board medium thickness, the circuit at decoupling capacitor two ends to chip connect and all deform upon so that PDN network
Inductance value change；
2nd, when PCB deforms upon (as shown in Figure 3), the coupled modes of other circuit high frequency signals on PDN network and PCB
Change.The electromagnetic field of this change also makes the voltage ripple in PDN loop change.
Based on above-mentioned 2 points, pcb board is under pressure moment, pcb board produce deformation, lead to PDN network power supply you electricity
Inductance value changes, thus based on the medium on pcb board and decoupling capacitor two ends to the circuit of chip, determining inductance on PDN
Difference value.
Further, loop oscillator is easily affected by voltage, and then leads to frequency of oscillation to change.When on PCB
When having FPGA device, by hardware program language, in FPGA indoor design, one forms closed-loop path by delay cell, and this closes
Closing loop is loop oscillator.This delay cell can the LUT unit example metaplasia within FPGA become.Its work output frequency
Affected by power supply ripple, now can design a testing circuit and come whether determination frequency changes.FPGA of the present invention
Design example is as shown in Figure 4：
1st, connected out a closed-loop path with LUT unit, the total delay of this closed-loop path meets the total phase of loop oscillator
Position postpones the requirement of (2 π).Drive a simple accumulator A (as shown in Figure 4) with the output frequency of this loop oscillator.
2nd, form the depositor group of a non-blocking fashion with 2 register concatenation, it inputs simple accumulator A in being
Output valve.The value of simple accumulator A is circulated past moving right every the fixed cycle by standard time clock CLK.
Based on the circuit structure shown in Fig. 4, can the first frequency of the first depositor output on obtaining PCB situation
Under, first frequency and the second frequency of the second depositor output on PCB are compared whether identical.
For example, in the diagram, in the state of normal PCB is undeformed, the value of 2 depositors is all stable, and phase
Deng.When PCB deforms upon suddenly, then the power supply ripple of supply fpga chip changes, and leads to the output frequency of loop oscillator
Rate changes, and so that the value of simple accumulator A is changed a lot.At this moment, when CLK drives 2 register rotation,
The value of depositor 1 is unequal with the value of depositor 2.Therefore the value by judging this 2 depositors may determine that PCB sends out in fact
Raw deformation.
When non-FPGA integrated circuit is used on PCB, available CMOS technology chip internal design with above-mentioned
The same circuit of FPGA circuitry design, also enables to detect the function of PCB deformation.
For to sum up, the method that provided in the embodiment of the present invention, it is possible to use when PCB deforms upon, PDN net inductive
Value changes cause the feature of power supply ripple change, to detect frequency shift (FS) in core on chip designs loop oscillator, thus according to frequency
Rate offsets and to determine the deformation of PCB.So carry out shape changing detection without mechanical activator or sensor, not only reduce PCB
The design cost of detection, and also save the free space on pcb board.
A kind of deformation detecting method of printed circuit board in the corresponding embodiment of the present invention, additionally provides in the embodiment of the present invention
A kind of deformation detecting device of printed circuit board, is illustrated in figure 5 a kind of deformation inspection of printed circuit board in the embodiment of the present invention
Survey the structural representation of device, this device includes：
Acquisition module 501, for obtaining inductance value on described printed circuit pcb board；According to described inductance value, determine and correspond to
Work output frequency；
Processing module 502, for determining that between described work output frequency and standard frequency, whether difference is less than default threshold
Value；If it is determined that described pcb board is undeformed；If not it is determined that described pcb board produces deformation.
Further, in embodiments of the present invention, described processing module 502, specifically for obtaining on power distribution network PDN
Inductance value；According to described inductance value, determine the voltage ripple value in described PDN loop；According to described voltage ripple value, determine
The corresponding described work output frequency of described voltage ripple value.
Further, in embodiments of the present invention, described acquisition module 501, specifically for based on the medium on described pcb board
And decoupling capacitor two ends, to the circuit of chip, determine the difference value of inductance on described PDN；Using described difference value as described electricity
Inductance value.
Further, in embodiments of the present invention, described processing module 502, posts specifically for obtaining on described PCB first
The first frequency of storage output；Described first frequency is compared with the second frequency of the second depositor output on described PCB is
No identical.
Although having been described for the preferred embodiment of the application, one of ordinary skilled in the art once knows substantially
Creative concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to wrap
Include preferred embodiment and fall into being had altered and changing of the application scope.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the application to the application
God and scope.So, if these modifications of the application and modification belong to the scope of the application claim and its equivalent technologies
Within, then the application is also intended to comprise these changes and modification.
Claims (8)
1. a kind of deformation detecting method of printed circuit board is it is characterised in that methods described includes：
Obtain inductance value on described printed circuit pcb board；According to described inductance value, determine corresponding work output frequency；
Determine between described work output frequency and standard frequency, whether difference is less than predetermined threshold value；
If it is determined that described pcb board is undeformed；
If not it is determined that described pcb board produces deformation.
2. the method for claim 1 is it is characterised in that according to described inductor value, determine corresponding work output frequency
Rate, including：
Obtain the inductance value on power distribution network PDN；
According to described inductance value, determine the voltage ripple value in described PDN loop；
According to described voltage ripple value, determine the corresponding described work output frequency of described voltage ripple value.
3. method as claimed in claim 2 it is characterised in that obtain power distribution network PDN on inductance value, including：
Based on the medium on described pcb board and decoupling capacitor two ends to the circuit of chip, determine the difference of inductance on described PDN
Value；
Using described difference value as described inductance value.
4. the method for claim 1 is it is characterised in that determine difference between described work output frequency and standard frequency
Whether it is less than predetermined threshold value, including：
Obtain the first frequency of the first depositor output on described PCB；
Described first frequency and the second frequency of the second depositor output on described PCB are compared whether identical.
5. a kind of deformation detecting device of printed circuit board is it is characterised in that include：
Acquisition module, for obtaining inductance value on described printed circuit pcb board；According to described inductance value, determine corresponding work
Output frequency；
Processing module, for determining between described work output frequency and standard frequency, whether difference is less than predetermined threshold value；If so,
Then determine that described pcb board is undeformed；If not it is determined that described pcb board produces deformation.
6. device as claimed in claim 5 is it is characterised in that described processing module, specifically for obtaining power distribution network
Inductance value on PDN；According to described inductance value, determine the voltage ripple value in described PDN loop；According to described voltage ripple
Value, determines the corresponding described work output frequency of described voltage ripple value.
7. device as claimed in claim 6 is it is characterised in that described acquisition module, specifically for based on described pcb board
Medium and decoupling capacitor two ends, to the circuit of chip, determine the difference value of inductance on described PDN；Using described difference value as institute
State inductance value.
8. device as claimed in claim 5 is it is characterised in that described processing module, specifically for obtaining the on described PCB
The first frequency of one depositor output；Second frequency ratio by the second depositor output on described first frequency and described PCB
More identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788420.XA CN106382883B (en) | 2016-08-31 | 2016-08-31 | Deformation detection method and device for printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788420.XA CN106382883B (en) | 2016-08-31 | 2016-08-31 | Deformation detection method and device for printed circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106382883A true CN106382883A (en) | 2017-02-08 |
| CN106382883B CN106382883B (en) | 2020-09-18 |
Family
ID=57938803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610788420.XA Active CN106382883B (en) | 2016-08-31 | 2016-08-31 | Deformation detection method and device for printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106382883B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809882A (en) * | 2017-09-21 | 2018-03-16 | 维沃移动通信有限公司 | A kind of method and mobile terminal for repairing pcb board deformation |
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| US4114428A (en) * | 1976-09-24 | 1978-09-19 | Popenoe Charles H | Radio-frequency tuned-circuit microdisplacement transducer |
| US5281836A (en) * | 1989-10-12 | 1994-01-25 | Schlumberger Industries | Semiconductor sensor with perpendicular N and P-channel MOSFET's |
| US20020158840A1 (en) * | 2001-04-27 | 2002-10-31 | Alps Electric Co., Ltd. | Coordinate input device having reduced number of components, being easy to assemble, and including deformation detecting elements |
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| CN204258753U (en) * | 2014-10-31 | 2015-04-08 | 中国兵器工业集团第二一四研究所苏州研发中心 | A kind of high accuracy clock circuit of resistance to high overload based on thick-film resistor |
| CN105424232A (en) * | 2015-12-28 | 2016-03-23 | 江门市泓科电子科技有限公司 | Pressure sensor using inductance type induction and sensing method |
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2016
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Patent Citations (6)
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|---|---|---|---|---|
| US4114428A (en) * | 1976-09-24 | 1978-09-19 | Popenoe Charles H | Radio-frequency tuned-circuit microdisplacement transducer |
| US5281836A (en) * | 1989-10-12 | 1994-01-25 | Schlumberger Industries | Semiconductor sensor with perpendicular N and P-channel MOSFET's |
| US20020158840A1 (en) * | 2001-04-27 | 2002-10-31 | Alps Electric Co., Ltd. | Coordinate input device having reduced number of components, being easy to assemble, and including deformation detecting elements |
| CN104076235A (en) * | 2013-03-27 | 2014-10-01 | 深圳市海洋王照明工程有限公司 | Method of detecting open circuit of printed line of PCB |
| CN204258753U (en) * | 2014-10-31 | 2015-04-08 | 中国兵器工业集团第二一四研究所苏州研发中心 | A kind of high accuracy clock circuit of resistance to high overload based on thick-film resistor |
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Non-Patent Citations (2)
| Title |
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| ALTERA公司: "《AN 574印刷电路板（PCB）供电网络（PDN）设计方法》", 31 May 2009 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809882A (en) * | 2017-09-21 | 2018-03-16 | 维沃移动通信有限公司 | A kind of method and mobile terminal for repairing pcb board deformation |
| CN107809882B (en) * | 2017-09-21 | 2019-10-15 | 维沃移动通信有限公司 | A kind of method and mobile terminal for repairing pcb board deformation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106382883B (en) | 2020-09-18 |
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