CN105092993A - Method and measurement system for detecting power adapter - Google Patents
Method and measurement system for detecting power adapter Download PDFInfo
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- CN105092993A CN105092993A CN201410154846.0A CN201410154846A CN105092993A CN 105092993 A CN105092993 A CN 105092993A CN 201410154846 A CN201410154846 A CN 201410154846A CN 105092993 A CN105092993 A CN 105092993A
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Abstract
The invention discloses a method and a measurement system for detecting a power adapter. The method for detecting the power adapter comprises the step of acquiring radio frequency signals of a DC output port of the power adapter, wherein the radio frequency signals are used for measuring interference imposed on a computer telecommunication port by the power adapter. The measurement system for detecting the power adapter comprises a coupling/decoupling network, an EMI receiver, a simulated load and an artificial mains network, and is characterized in that an EUT end of the coupling/decoupling network is connected to a DC output end of the power adapter; a radio frequency input end of the EMI receiver is connected to a radio frequency output end of the coupling/decoupling network; the simulated load is connected to an AE end of the coupling/decoupling network; and the artificial mains supply is connected to an AC input end of the power adapter. According to the invention, accurate interference voltage measurement can be carried out on the power adapter of a notebook computer, thereby being well anticipating a test result of a telecommunication port when a notebook computer power adapter product is matched with the notebook computer.
Description
Technical field
The present invention relates to the electromagnetic interference measurement, EMI measurement technical field of notebook computer, particularly relate to a kind of method and measuring system of power supply adaptor.
Background technology
Present notebook computer is more and more universal, progressively instead of the status of desktop personal computer, and the electromagnetic interference problem of notebook computer also more and more causes concern, and wherein the Conduction Interference of telecommunication port is exactly wherein one.Notebook computer belongs to Information Technology Equipment, according to the radio interference limit value of CISPR22:2008 to Information Technology Equipment and the requirement of measuring method, measure the Conduction Interference of telecommunication port, and the limit value that measurement result will specify lower than CISPR22:2008.But the interference voltage of existing notebook telecommunication port is tested, because laptop and notebook host are not that same manufacturer produces usually, power supply adaptor cannot obtain the notebook computer of respective model early stage usually in product development, often just telecommunication port interference is caused to the power supply adaptor of notebook and exceed standard at the real Qualify Phase of joining of development late stage and test, can will cause great impact to the entrance into market of product, therefore the manufacturer of power supply adaptor needs a kind of method of testing whether can cause telecommunication port for assessment of DC output end mouth to exceed standard.
Summary of the invention
The object of the present invention is to provide a kind of method and the measuring system that detect power supply adaptor, in order to measure the DC output end mouth interference voltage of power supply adaptor, avoid the real Qualify Phase of joining of development late stage just to find that power supply adaptor causes telecommunication port interference and exceeds standard, cause the problem that production cost increases.
The invention discloses a kind of method detecting power supply adaptor, wherein, comprise the radiofrequency signal of the DC output end mouth gathering power supply adaptor, described radiofrequency signal is for weighing the interference of described power supply adaptor to computer telecommunication port.
Detect an embodiment of the method for power supply adaptor according to the present invention, wherein, described radiofrequency signal is passed through calibration and is compensated before weighing.
Detect an embodiment of the method for power supply adaptor according to the present invention, wherein, described method is in the described power supply adaptor of simulation and is connected with computing machine and carries out in also normal operative condition.
Detect an embodiment of the method for power supply adaptor according to the present invention, wherein, comprising: use coupling decoupling network the DC output end radiofrequency signal of described power supply adaptor to be coupled; EMI receiver is used to receive the radiofrequency signal after described coupling decoupling network coupling; Fictitious load is used to make described power supply adaptor be in analog operation situation; Artificial mains network is used to power to described power supply adaptor.
The measuring system of a kind of method for implementing above-mentioned detection power supply adaptor of the present invention, wherein, comprising: coupling decoupling network, and its EUT holds the DC output end connecting power supply adaptor; EMI receiver, its rf inputs connects the radio-frequency (RF) output end of this coupling decoupling network; Fictitious load, connects the AE end of this coupling decoupling network; And artificial mains network, connect the ac input end of this power supply adaptor.
According to an embodiment of measuring system of the present invention, wherein, the AE end of this coupling decoupling network has inner isolation circuit, to isolate the interference of this fictitious load.
According to an embodiment of measuring system of the present invention, wherein, this EMI receiver comprises the quasi-peak detector and average reading detector.
According to an embodiment of measuring system of the present invention, wherein, this artificial mains network is V-type artificial mains network.
According to an embodiment of measuring system of the present invention, wherein, be connected by a concentric cable between the radio-frequency (RF) output end of this coupling decoupling network and the rf inputs of this EMI receiver.
According to an embodiment of measuring system of the present invention, wherein, also comprise with reference to ground plate, this coupling decoupling network, fictitious load, artificial mains network and this power supply adaptor are arranged on this reference ground plate.
According to an embodiment of measuring system of the present invention, wherein, this coupling decoupling network, this fictitious load, this artificial mains network and this power supply adaptor are more than or equal to 0.5m at the edge of this reference ground plate of Edge Distance of the projection of this reference ground plate.
According to an embodiment of measuring system of the present invention, wherein, this power supply adaptor is on insulating stand and vertical range 30cm to the 50cm be set to apart from this reference ground plate, the interchange end of this power supply adaptor is 70cm to 90cm to the horizontal range of this artificial mains network, and the DC output end of this power supply adaptor is 70cm to 90cm to the horizontal range of this coupling decoupling network.
According to an embodiment of measuring system of the present invention, wherein, this power supply adaptor is 40cm apart from the vertical range of this reference ground plate, the interchange end of this power supply adaptor is 80cm to the horizontal range of this artificial mains network, and the DC output end of this power supply adaptor is 80cm to the horizontal range of this coupling decoupling network.
To sum up, the present invention measures by carrying out interference voltage accurately to the power supply adaptor of notebook, well can predict the test result of the telecommunication port of power supply adapter for notebook computer product when arranging in pairs or groups notebook computer, so just can when there is no notebook computer during power supply adaptor research and development of products, disturb voltage measuring value according to DC output end dry and predict whether telecommunication port measured value meets standard-required, if do not meet standard-required can reach standard-required by applying Improving Measurements, be up to standard smoothly when enabling its later stage measure telecommunication port.
Accompanying drawing explanation
Figure 1 shows that the structural representation of the measuring system detecting power supply adaptor;
Fig. 2 ~ Fig. 4 is respectively the experiment curv figure of the telecommunication port conduction interference of three notebook computers and the DC output end mouth of power supply adaptor.
Embodiment
Present inventor finds that when the telecommunication port Conduction Interference of actual measurement notebook computer the AC/DC power supply adaptor that the Conduction Interference of telecommunication port and notebook computer are arranged in pairs or groups has much relations, and the power supply adaptor test result of arranging in pairs or groups different sometimes difference is very large.By finding that the electromagnetic interference signal of power supply adaptor can be delivered to the telecommunication port of notebook by the DC output end oral instructions of adapter to the principle analysis of notebook telecommunication port Conduction Interference, become the key factor causing notebook telecommunication port test failure.Therefore the application have developed the oral instructions of a kind of power supply adaptor DC output end especially leads interference voltage measuring system and method.
According to the method for above-mentioned analysis detection power supply adaptor of the present invention, gather the radiofrequency signal of the DC output end mouth of power supply adaptor, and radiofrequency signal is for weighing the interference of power supply adaptor to computer telecommunication port.Further, for gathering the radiofrequency signal of the DC output end mouth of power supply adaptor and analyze more accurately, need to carry out calibrating and compensating before weighing in radiofrequency signal.
Figure 1 shows that the structural drawing of the measuring system of the method detecting power supply adaptor, further illustrate the measuring system of method detecting power supply adaptor shown in composition graphs 1, the oral instructions of power supply adaptor DC output end are led interference voltage measuring system and are comprised: coupling decoupling network 4(CouplingDecouplingNetwork), fictitious load 5, artificial mains network 1(LineImpedanceStabilizationNetwork) and EMI receiver 3.
With reference to figure 1, measuring system comprises with the syndeton of power supply adaptor 2: artificial mains network 1 is connected the ac input end of power supply adaptor 2, to provide electric power to power supply adaptor 2.The EUT end of the DC output end butt coupling decoupling network 4 of power supply adaptor 2, the radio-frequency (RF) output end of coupling decoupling network 4 connects the rf inputs of EMI receiver 3, and the AE of coupling decoupling network 4 holds connecting analog load 5.The DC output end radiofrequency signal of power supply adaptor 2 is coupled by coupling decoupling network 4.
The principle of work that interference voltage measuring system is led in the oral instructions of power supply adaptor DC output end is sketched below in conjunction with Fig. 1, artificial mains network 1 provides AC power to power supply adaptor 2, fictitious load 5 is as the load of simulation notebook computer, and it is generally the load of simulation notebook power consumption.The EUT end of the DC output end butt coupling decoupling network 4 of power supply adaptor 2, the AE of coupling decoupling network 4 holds connecting analog load 5.The radio-frequency (RF) output end of coupling decoupling network 4 connects the rf inputs of EMI receiver 3.The level of the undesired signal that EMI receiver 3 measuring coupling decoupling network 4 is coupled out.In general, EMI receiver 3 should comprise the quasi-peak detector and average reading detector, to be used for the quasi-peak value of measurements interference signal and mean value respectively.Further, the AE end of coupling decoupling network 4 has inner isolation circuit, to isolate the interference that fictitious load 5 produces.The earth impedance of coupling decoupling network 4 is 150 Ω, identical with the common mode interference signal earth impedance that artificial mains network measures the impedance stable network that telecommunication port that notebook computer measures uses.The impedance of RF output port termination 50 Ω of artificial mains network 1.
For an embodiment, artificial mains network can select V-type artificial mains network.
For ensureing the accuracy of test, measuring system should be simulated described power supply adaptor and is connected with computing machine and tests in normal operative condition.Concrete layout comprises:
With further reference to Fig. 1, whole measuring system is arranged in one with reference on ground plate on 6, and the edge of the projecting edge distance reference ground connection flat board 6 of each equipment in whole measuring system at least should be 0.5m.In order to ensure the DC output end oral instructions of power supply adaptor 2 lead interference measurement results arrange in pairs or groups with reality as far as possible notebook computer time the interference level of DC output end mouth close, the DC output end mouth of power supply adaptor 2 measure arrange the common mode need for environment introduced arrange with the measurement of telecommunication port as far as possible in common mode environment close, therefore with reference to the method for arranging of telecommunication port in CISPR22:2008 standard, design DC output end mouth test arrangement, as shown in Figure 1, power supply adaptor 2 is placed on the high non-conductive desk 7 of 40cm, artificial mains network 1 is fixed on and keeps good earth with reference on ground connection flat board 6.The ac input end of power supply adaptor 2 is 80cm to the horizontal range of artificial mains network 1, if the power lead length of power supply adaptor 2 is more than 80cm, redundance can be bundled into the wire harness of 8-shaped.The DC output end of power supply adaptor 2 receives the EUT port of coupling decoupling network 4; The radio-frequency (RF) output end of coupling decoupling network 4 can be connected to the rf inputs of EMI receiver 3 by the concentric cable 10 of 50 Ω; The AE termination fictitious load 5 of coupling decoupling network 4; Coupling decoupling network 4 is fixed on reference on ground plate 6, and keeps good earth.The DC output end mouth of power supply adaptor 2 is 80cm to the horizontal range of coupling decoupling network 4, if the DC leadout length of power supply adaptor 2 is more than 80cm, is bundled into 8-shaped wire harness.
Certainly, above-mentioned distance values is only preferably example, and does not immobilize.In fact those skilled in the art also slightly can adjust above-mentioned distance values, it is made to maintain in certain scope, such as, power supply adaptor 2 is between 30cm to 50cm to the vertical range with reference to ground plate 6, the ac input end of power supply adaptor 2 is between 70cm to 90cm to the horizontal range of artificial mains network 1, and the DC output end of power supply adaptor 2 is between 70cm to 90cm to the horizontal range of coupling decoupling network 4.
In order to verify the validity that the prediction of the method detecting power supply adaptor affects telecommunication port conduction interference, 3 power supply adaptors can be got as sample, first to arrange in pairs or groups respectively respective notebook computer by the telecommunication port measuring method of notebook, and measure the common mode disturbance voltage of power supply adaptor 150kHz ~ 30MHz respectively with detecting the method for power supply adaptor notebook computer of not arranging in pairs or groups, Fig. 2 ~ Fig. 4 is respectively the experiment curv figure of the telecommunication port conduction interference of three notebook computers and the DC output end mouth of power supply adaptor, A in Fig. 2 ~ Fig. 4 represents the measurement result curve of telecommunication port, B represents the measurement result curve of DC output end mouth, following result can be obtained: (1) is within the scope of 150KHz ~ 5MHz from the comparison of Fig. 2 ~ Fig. 4, measure the DC output end mouth common mode disturbance voltage obtained and be all greater than telecommunication port common mode disturbance voltage value, and the trend of the experiment curv of two kinds of methods and shape are very consistent, (2) have some arrowbands to harass signal in the result measured in telecommunication port, its amplitude is higher than the measured value of DC output end mouth, and these arrowbands are harassing and wrecking signals is notebook computer generations itself, and it doesn't matter with power supply adaptor.
As can be seen from above observations, the method detecting power supply adaptor may be used for the accordance predicting the harassing and wrecking of telecommunication port common mode.The measured value of the DC output end mouth obtained by the method detecting power supply adaptor is only less than the limit value requirement of telecommunication port conduction interference, and so in later stage power supply adaptor collocation, notebook computer carries out meeting the requirement that telecommunication port measures limit value too when telecommunication port is measured.Otherwise if the conduction interference of DC output end mouth exceeds the conduction interference limit value of telecommunication port, this power supply adaptor collocation notebook computer to cause telecommunication port conducted emission test defective.The method detecting power supply adaptor effectively can have been predicted the manufacturer of power supply adaptor and have practical value.
To sum up, the present invention measures by carrying out interference voltage accurately to the power supply adaptor of notebook, well can predict the test result of the telecommunication port of power supply adapter for notebook computer product when arranging in pairs or groups notebook computer, so just can when there is no notebook computer during power supply adaptor research and development of products, disturb voltage measuring value according to DC output end dry and predict whether telecommunication port measured value meets standard-required, if do not meet standard-required can reach standard-required by applying Improving Measurements, be up to standard smoothly when enabling its later stage measure telecommunication port.
Technical scheme of the present invention is disclosed as above by preferred embodiment.The change that those skilled in the art do when should recognize the scope and spirit of the present invention disclosed in the claim do not departed from appended by the present invention and retouching, within the protection domain all belonging to claim of the present invention.
Claims (13)
1. detect a method for power supply adaptor, it is characterized in that, comprise the radiofrequency signal of the DC output end mouth gathering power supply adaptor, described radiofrequency signal is for weighing the interference of described power supply adaptor to computer telecommunication port.
2. the method for claim 1, is characterized in that, described radiofrequency signal is passed through calibration and compensated before weighing.
3. method as claimed in claim 1 or 2, is characterized in that, described method is in the described power supply adaptor of simulation and is connected with computing machine and carries out in also normal operative condition.
4. method as claimed in claim 1 or 2, is characterized in that, comprising:
Coupling decoupling network is used the DC output end radiofrequency signal of described power supply adaptor to be coupled;
EMI receiver is used to receive the radiofrequency signal after described coupling decoupling network coupling;
Fictitious load is used to make described power supply adaptor be in analog operation situation;
Artificial mains network is used to power to described power supply adaptor.
5. for implementing a measuring system for method according to any one of Claims 1-4, it is characterized in that, comprising:
Coupling decoupling network, its EUT holds the DC output end connecting power supply adaptor;
EMI receiver, its rf inputs connects the radio-frequency (RF) output end of this coupling decoupling network;
Fictitious load, connects the AE end of this coupling decoupling network; And
Artificial mains network, connects the ac input end of this power supply adaptor.
6. measuring system as claimed in claim 5, is characterized in that, the AE end of this coupling decoupling network has inner isolation circuit, to isolate the interference of this fictitious load.
7. measuring system as claimed in claim 5, it is characterized in that, this EMI receiver comprises the quasi-peak detector and average reading detector.
8. measuring system as claimed in claim 5, it is characterized in that, this artificial mains network is V-type artificial mains network.
9. measuring system as claimed in claim 5, be is characterized in that, be connected between the radio-frequency (RF) output end of this coupling decoupling network and the rf inputs of this EMI receiver by a concentric cable.
10. measuring system as claimed in claim 5, is characterized in that, also comprise with reference to ground plate, this coupling decoupling network, fictitious load, artificial mains network and this power supply adaptor are arranged on this reference ground plate.
11. measuring systems as claimed in claim 10, it is characterized in that, this coupling decoupling network, this fictitious load, this artificial mains network and this power supply adaptor are more than or equal to 0.5m at the edge of this reference ground plate of Edge Distance of the projection of this reference ground plate.
12. measuring systems as claimed in claim 10, it is characterized in that, this power supply adaptor is on insulating stand and vertical range 30cm to the 50cm be set to apart from this reference ground plate, the interchange end of this power supply adaptor is 70cm to 90cm to the horizontal range of this artificial mains network, and the DC output end of this power supply adaptor is 70cm to 90cm to the horizontal range of this coupling decoupling network.
13. measuring systems as claimed in claim 12, it is characterized in that, this power supply adaptor is 40cm apart from the vertical range of this reference ground plate, the interchange end of this power supply adaptor is 80cm to the horizontal range of this artificial mains network, and the DC output end of this power supply adaptor is 80cm to the horizontal range of this coupling decoupling network.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410154846.0A CN105092993B (en) | 2014-04-17 | 2014-04-17 | Detect the method and measuring system of power supply adaptor |
| TW103121655A TWI601963B (en) | 2014-04-17 | 2014-06-24 | Detecting method of power adapter and measuring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410154846.0A CN105092993B (en) | 2014-04-17 | 2014-04-17 | Detect the method and measuring system of power supply adaptor |
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| CN105092993A true CN105092993A (en) | 2015-11-25 |
| CN105092993B CN105092993B (en) | 2019-03-29 |
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| CN201410154846.0A Active CN105092993B (en) | 2014-04-17 | 2014-04-17 | Detect the method and measuring system of power supply adaptor |
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| TW (1) | TWI601963B (en) |
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| CN111025075B (en) * | 2020-01-14 | 2022-06-21 | 浙江吉利汽车研究院有限公司 | Electromagnetic disturbance test system |
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| CN103018596A (en) * | 2012-11-30 | 2013-04-03 | 重庆长安汽车股份有限公司 | Electromagnetic interference testing system and electromagnetic interference testing method for direct-current converter |
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2014
- 2014-04-17 CN CN201410154846.0A patent/CN105092993B/en active Active
- 2014-06-24 TW TW103121655A patent/TWI601963B/en active
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| CN102313868A (en) * | 2010-07-07 | 2012-01-11 | 鸿富锦精密工业（深圳）有限公司 | Telecommunication end measuring device |
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| CN202351353U (en) * | 2011-12-14 | 2012-07-25 | 天津天维移动通讯终端检测有限公司 | Electro-magnetic interference detecting system for power line conduction |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI601963B (en) | 2017-10-11 |
| TW201541096A (en) | 2015-11-01 |
| CN105092993B (en) | 2019-03-29 |
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Effective date of registration: 20210108 Address after: 215200 no.1688, Jiangxing East Road, Wujiang Economic and Technological Development Zone, Wujiang City, Suzhou City, Jiangsu Province Patentee after: Delta Electronics (Jiangsu) Ltd. Address before: 215200 no.1688, Jiangxing East Road, Wujiang Economic Development Zone, Jiangsu Province Patentee before: DELTA ELECTRONICS COMPONENTS (WUJIANG) Ltd. |