CN111983497A - Inspection device for power supply unit - Google Patents
Inspection device for power supply unit Download PDFInfo
- Publication number
- CN111983497A CN111983497A CN202010411487.8A CN202010411487A CN111983497A CN 111983497 A CN111983497 A CN 111983497A CN 202010411487 A CN202010411487 A CN 202010411487A CN 111983497 A CN111983497 A CN 111983497A
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- power supply
- supply unit
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- dummy
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- 238000007689 inspection Methods 0.000 title claims abstract description 47
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention provides a power supply unit inspection device, which can find noise possibly generated when a power supply unit is actually used in a previous inspection. The inspection device is provided with: the test device includes a conductor electrically connected to a ground line of the power supply unit when the power supply unit is tested, a load that consumes power supplied from the power supply unit, and at least one dummy cable having one end electrically connected to the conductor.
Description
Technical Field
The present invention relates to an inspection apparatus for a power supply unit.
Background
Generally, an electric device operated by electric power supplied from an external ac power supply incorporates a power supply unit. The power supply unit is used to convert a current input from an external ac power supply into a dc current and supply the dc current to a circuit or the like inside an electric device. The power supply unit may generate various noises when operating. Specifically, unnecessary electromagnetic waves as noise may be radiated into the surrounding air, or the noise may propagate to the surrounding devices via the current paths on the input and output sides of the power supply unit. Therefore, the manufacturer that manufactures the power supply unit applies a noise prevention measure to the power supply unit, and checks in advance to what degree the noise generated by the manufactured power supply unit is actually suppressed, to ensure the target performance.
Technical problem to be solved by the invention
When an electric apparatus having a power supply unit built therein is actually used, noise that would not be generated when the power supply unit is individually checked may be generated by the power supply unit. When this occurs, even a single inspection of the power supply unit cannot confirm that sufficient noise prevention measures have been implemented in advance, and the manufacturing and development of the power supply unit are hampered.
The present invention has been made in view of the above problems, and an object thereof is to provide a power supply unit inspection device and an inspection method capable of finding noise that may be generated when a power supply unit is actually used, in an inspection in advance.
Disclosure of Invention
Technical solution for solving technical problem
The present invention provides an inspection apparatus for a power supply unit for measuring noise generated by the power supply unit mounted in an electrical device, the inspection apparatus comprising: the power supply device includes a conductor electrically connected to a ground of the power supply unit when the power supply unit is inspected, a load consuming power supplied from the power supply unit, and at least one dummy cable having one end electrically connected to the conductor.
A method for inspecting a power supply unit according to the present invention is a method for inspecting a power supply unit mounted on an electrical device, the method including: the method includes a step of electrically connecting at least one dummy cable to a ground line of the power supply unit, a step of supplying power from the power supply unit to a load in a state where the dummy cable is connected, and a step of measuring noise generated by the power supply unit in a state where power is supplied to the load.
An inspection system according to the present invention is an inspection system including a power supply unit mounted on an electrical device for use, and an inspection device for measuring noise generated by the power supply unit, the inspection system including: the power supply device includes a conductor electrically connected to a ground of the power supply unit when the power supply unit is inspected, a load consuming power supplied from the power supply unit, and at least one dummy cable having one end electrically connected to the conductor.
Drawings
Fig. 1 is a perspective view showing an outline of the configuration of an inspection apparatus for a power supply unit according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a main body of an inspection apparatus for a power supply unit according to an embodiment of the present invention, as viewed from a front direction.
Fig. 3 is a diagram showing an example of use of an electrical device mounted on a power supply unit as a target of inspection by an inspection apparatus.
Description of the reference numerals
1 an inspection device; 2a power supply unit; 11 a frame; 12a base; 12a spacer; 13 load; 14 a power cable; 15a, 15b, 15c dummy cables; 50 computers; 51, 56, 61 power cables; 52 a display device; 53 operating the device; 54 a communication device; 55, 57, 59, 60 signal cables; 58 headset.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings.
Fig. 1 is a diagram showing an overview of the configuration of an inspection apparatus 1 for a power supply unit according to an embodiment of the present invention, and is a perspective view seen from the rear and above. As shown in fig. 1, the inspection apparatus 1 is an apparatus used for measuring noise generated by the power supply unit 2, and includes: frame 11, base 12, load 13, power cable 14, and a plurality of dummy cables 15. In fig. 1, the main body of the inspection apparatus 1 is disposed above the table T. Fig. 2 is a diagram showing the inside of the frame 11 of the inspection apparatus 1, and is a cross-sectional view of the main body of the inspection apparatus 1 as viewed from the front.
In the present embodiment, the power supply unit 2 is mounted on the computer 50 for use. Here, a specific example of the usage of the computer 50 will be described with reference to fig. 3. The computer 50 is, for example, a home game machine or the like, and incorporates the power supply unit 2. The power supply unit 2 is connected to an external ac power supply via a power supply cable 51, converts power input via the power supply cable 51 into dc current, and supplies the dc current to circuits and electronic components inside the computer 50.
Further, the computer 50 is assumed to be used in a state where a plurality of connected devices are connected. Specifically, three connection devices, i.e., a display device 52, an operation device 53, and a communication device 54, are connected to the computer 50.
The display device 52 is a liquid crystal display or the like, and is connected to the computer 50 via a signal cable 55 that transmits a video signal. The display device 52 receives a video signal transmitted via the signal cable 55 from the computer 50, and displays a video corresponding to the video signal. A power supply cable 56 is connected to the display device 52, and the display device 52 is operated by electric power supplied from an external power supply via the power supply cable 56.
The operation device 53 is a controller of a home game machine or the like, and is connected to the computer 50 via a signal cable 57 based on a communication standard such as USB. The operation device 53 receives various operation inputs from the user, and transmits operation information indicating the contents to the computer 50 via the signal cable 57. The operation device 53 is operated by power supplied from an internal power supply such as a built-in rechargeable battery or power supplied from the computer 50 via the signal cable 57. Therefore, unlike the display device 52, the operation device 53 is not connected with a power supply cable for supplying power.
In the present embodiment, a headset 58 can be connected to the operating device 53. The headset 58 is connected to the operating device 53 via a signal cable 59. The headset 58 reproduces audio corresponding to the audio signal transmitted from the computer 50 via the signal cable 57 and the signal cable 59, or transmits an audio signal representing the speech content of the user wearing the headset to the computer 50 via the signal cable 59 and the signal cable 57. The headset 58 is also operated by power supplied from an internal power supply such as a built-in rechargeable battery, and a power supply cable is not connected, as in the operation device 53. Instead of the headset 58, a headphone dedicated to audio reproduction may be connected.
The communication device 54 is a computer such as a personal computer different from the computer 50, is connected to the computer 50 via a signal cable 60, and transmits and receives various data to and from the computer 50. Here, the signal cable 60 may be, for example, a LAN cable or the like. A power supply cable 61 is connected to the communication device 54, and the communication device 54 operates using power supplied from an external power supply via the power supply cable 61.
The inspection apparatus 1 is configured to be able to operate the power supply unit 2 in an operating environment close to the operating environment when mounted on the computer 50. Next, the main components constituting the inspection apparatus 1 will be described with reference to fig. 1 and 2.
The frame 11 is a substantially rectangular parallelepiped case and is formed of an electric conductor such as a metal plate. A load 13 is provided in the frame 11. The frame 11 corresponds to a frame cabinet of the computer 50.
The base 12 is disposed on the upper surface of the frame 11. A power supply unit 2 as an inspection target is provided on the base 12. The base 12 is formed of a conductive material such as a metal plate, and is electrically connected to the frame 11. Here, the base 12 is connected to the frame 11 by a conductive spacer 12 a. The housing of the power supply unit 2 is fixed to the base 12 by screw fixing or the like, whereby the ground of the power supply unit 2 is electrically connected to the base 12 and the frame 11.
The load 13 is disposed in the frame 11, and an input side thereof is connected to a power input terminal (not shown) of the inspection apparatus 1. When the power supply unit 2 is inspected, the output terminal of the power supply unit 2 is connected to the power supply input terminal of the inspection apparatus 1. Thereby, the power supplied from the power supply unit 2 is input to the load 13.
In fig. 2, the load 13 is provided in the frame 11 on a metal plate coupled to the frame 11. The load 13 corresponds to a circuit or the like that operates in the computer 50 by the power supplied from the power supply unit 2. The load 13 preferably consumes the same level of power as the circuit and the like in the computer 50. In addition, the load 13 may change the power consumption by an operation of a switch or the like. In this way, by changing the power consumption of the load 13, the noise measurement of the power supply unit 2 can be performed under various operating conditions.
The ground of the load 13 is electrically connected to the frame 11. Thereby, the ground of the load 13 is connected to the ground of the power supply unit 2 via the frame 11 and the base 12, and the power supply unit 2 and the load 13 share the ground.
The power supply cable 14 is connected to the power supply unit 2, and inputs electric power supplied from an ac power supply to the power supply unit 2. The power supply cable 14 may input power supplied from, for example, a 100V or 230V ac power supply to the power supply unit 2. The power cable 14 may be the same as the power cable 51 used to supply power to the computer 50. It is preferable that at least the power cable 14 has the same length as the power cable 51 used when the computer 50 is used.
The plurality of dummy cables 15 each have a built-in conductive wire, one end of which is electrically connected to the outer surface of the frame 11. The conductive line of the dummy cable 15 may be connected to the outer surface of the frame 11 by various methods such as screwing and welding. Thereby, each dummy cable 15 is connected to the ground of the power supply unit 2 via the frame 11 and the base 12. In the present embodiment, each dummy cable 15 is connected to the upper surface of the frame 11. The plurality of dummy cables 15 are arranged in a radial shape from the frame 11 so as to be distant from each other.
The dummy cables 15 described above correspond to connection cables to be connected to the computer 50 when the computer 50 is used. Specifically, in the present embodiment, since the three connection devices, i.e., the display device 52, the operation device 53, and the communication device 54, are directly connected to the computer 50 as described above, three connection cables are connected to the computer 50 in addition to the power cable for supplying power to the power supply unit 2. Corresponding to the three connection cables, three dummy cables 15a, 15b, and 15c, the dummy cables 15 are connected to the frame 11. That is, the dummy cable 15a corresponds to a signal cable 55 connecting the computer 50 and the display device 52, and a power supply cable 56 additionally connected to the display device 52. The dummy cable 15b corresponds to a signal cable 57 connecting the computer 50 and the operating device 53, and a signal cable 59 additionally connecting the operating device 50 and a headset 58 in front thereof. The dummy cable 15c corresponds to a signal cable 60 connecting the computer 50 and the communication device 54, and a power supply cable 61 additionally connected to the communication device 54.
In a state where the computer 50 is connected to the connection device via various cables, the cables function as a kind of antenna, and noise from the power supply unit 2 may be radiated or propagated. Therefore, the power supply unit inspection apparatus 1 of the present embodiment is expected to generate noise having a content close to that of noise that can be generated when the computer 50 is actually used, from the power supply unit 2 by disposing the dummy cable 15 corresponding to the cable that is supposed to be connected to the computer 50 when the power supply unit 2 is actually used. Since the dummy cable 15 is intended to be used as an antenna for the power supply unit 2, the end portion on the opposite side to the side to which the frame 11 is connected is not connected to any device, and is not used for transmitting signals or electric power.
Since each dummy cable 15 is only required to be used as an antenna, it is not necessary to dispose a conductive wire having the same material and thickness as those of the corresponding cable connected to the computer 50. Each dummy cable 15 corresponds to a plurality of cables, but may be divided into a plurality of cables, not just the same as the corresponding cables, or may be a single cable. On the other hand, in order to have a function of being close to the cable connected to the computer 50, it is preferable that the length of each dummy cable 15 is close to the length of the corresponding cable. That is, the dummy cable 15a preferably has a length corresponding to the sum of the lengths of the corresponding signal cable 55 and power supply cable 56. Likewise, the dummy cable 15b preferably has a length corresponding to the sum of the lengths of the signal cable 57 and the signal cable 59, and the dummy cable 15c preferably has a length corresponding to the sum of the lengths of the signal cable 60 and the power supply cable 61. However, the lengths of the various cables connected to the computer 50 are not limited to be always constant, and cables of various lengths may be connected. Therefore, the length of each dummy cable 15 does not necessarily completely match the length of the corresponding cable.
The dummy cables 15 include a cable having an open end connected to an end opposite to one side of the frame 11. Further, a cable connected to the ground at one end opposite to the one side of the frame 11 is included. The difference between the two is determined according to whether each dummy cable 15 corresponds to a power cable connected to an external power supply. That is, one end of each of the dummy cable 15a corresponding to the power cable 56 and the dummy cable 15c corresponding to the power cable 61 is grounded to the ground. This corresponds to the power cables 56 and 61 being connected to an external power source when the computer 50 is in use. On the other hand, one end of the dummy cable 15b corresponding to the operation device 53 and the headset 58, which are operated by an internal power supply such as an internal rechargeable battery or by power supplied from the computer 50 and to which the power supply cable is not directly connected, is opened and not grounded. Thus, the dummy cables 15a and 15c function as a loop antenna, and the dummy cable 15b functions as a monopole antenna. The above-described cables function similarly to the respective cables connected to the computer 50.
Next, an example of a flow of noise measurement by the power supply unit 2 of the inspection apparatus 1 described above will be described. First, the power supply unit 2 as an inspection target is fixed to the base 12. Thereby, the ground of the load 13 and the ground of the power supply unit 2 are electrically connected through the frame 11 and the base 12, and the dummy cables 15 are electrically connected through the frame 11 and the base 12 and the ground of the power supply unit 2. After that, the power supply unit 2 and the load 13 are connected, and the power supply cable 14 is connected to the power supply unit 2. Then, ac power is supplied to the power supply unit 2 via the power supply cable 14, and the power supply unit 2 is operated. The power supply unit 2 converts the supplied power into a dc current, and inputs the dc current to the load 13 to consume the power.
In the state where the power supply unit 2 is operated in this manner, the noise generated by the power supply unit 2 is measured. Specifically, the intensity of the electromagnetic wave radiated by the power supply unit 2 is measured by a measuring instrument provided around the power supply unit 2. In this case, it is preferable to measure the electromagnetic waves radiated in a plurality of directions from the power supply unit 2 by changing the position of the measuring instrument or rotating the entire inspection apparatus 1 mounted on the power supply unit 2. In order to accurately measure the electromagnetic wave, it is preferable to measure the electromagnetic wave in a state where the inspection apparatus 1 is installed in a dark radio room. Further, measuring instruments are attached to positions on the upstream side of the power supply cable 14 (the side opposite to the power supply unit 2) and on the tip side of each dummy cable 15 (the side opposite to the power supply unit 2), and the noise current transmitted through the cables is measured. This makes it possible to measure the intensity of the noise generated by the power supply unit 2 on various paths and verify whether or not the generated noise is equal to or less than a target reference.
As described above, according to the inspection apparatus 1 for a power supply unit of the embodiment of the present invention, the power supply unit 2 can be operated in an operating environment close to that when the computer 50 is used, and noise relatively close to that in a state mounted on the computer 50 can be generated by the power supply unit 2. Thus, the intensity of noise generated when the computer 50 is mounted with the power supply unit 2 can be verified without performing a test in a state where the computer 50 is actually mounted with the power supply unit 2.
The embodiments of the present invention are not limited to the above. For example, although the power supply unit 2 is built in the computer 50 in the above description, the power supply unit 2 is not limited to being built in the computer 50, and may be built in various electric devices. In this case, when the electric device incorporating the power supply unit 2 is used, the power supply unit 2 is inspected in a state where the dummy cable 15 corresponding to the cable up to the connection device connected to the electric device is connected, whereby the magnitude of noise that can be generated in actual use can be inspected in advance. The total number of dummy cables 15, the number of grounded dummy cables 15, and the number of dummy cables 15 having one open end in the above description are also examples, and may be changed according to the number of cables to be connected to the electrical device in which the power supply unit 2 is mounted and the connection method of the connection device.
The structure of the frame 11 in the above description is merely an example, and may have a different structure. In the above description, the power supply unit 2 is provided on the base 12 electrically connected to the frame 11, but the power supply unit 2 may be directly connected to the frame 11. In this case, the base 12 may not be provided. The dummy cable 15 may be connected to the base 12 instead of the frame 11. In any case, by electrically connecting one end of the dummy cable 15 to a conductor electrically connected to the ground of the power supply unit 2, the dummy cable 15 can be used as an antenna, and noise close to that generated when the power supply unit 2 is mounted on the computer 50 can be generated.
Claims (8)
1. An inspection device for a power supply unit, which measures noise generated by the power supply unit mounted on an electrical apparatus, comprising:
a conductor electrically connected to a ground line of the power supply unit when the power supply unit is inspected;
a load that consumes power supplied from the power supply unit;
and at least one dummy cable having one end electrically connected to the electrical conductor.
2. The inspection device of a power supply unit according to claim 1,
the electric device is used in a state where a plurality of connection cables are connected to connect a plurality of connection devices,
a plurality of dummy cables corresponding to the plurality of connection cables are connected to the conductor.
3. The inspection device of a power supply unit according to claim 2,
at least one of the dummy cables has one end connected to the opposite side of the conductor grounded.
4. An inspection apparatus of a power supply unit according to claim 2 or 3,
at least one of the dummy cables has an open end at an end opposite to a side connected to the conductor.
5. The inspection device of a power supply unit according to any one of claims 2 to 4,
in the dummy cable corresponding to a connection device that operates by power supplied from the outside among the plurality of connection devices, one end of the dummy cable opposite to the side connected to the conductor is grounded, and in the remaining dummy cables, one end of the dummy cable opposite to the side connected to the conductor is an open end.
6. The inspection device of a power supply unit according to any one of claims 1 to 5,
the ground wire of the load is electrically connected to the conductor.
7. A method for inspecting a power supply unit mounted on an electrical device, comprising:
an electrical connection step of electrically connecting at least one dummy cable to a ground line of the power supply unit;
a supply step of supplying power from the power supply unit to a load in a state where the dummy cable is connected;
and a measuring step of measuring noise generated by the power supply unit in a state where power is supplied to the load.
8. An inspection system, comprising:
a power supply unit mounted on an electrical device for use;
an inspection device for measuring noise generated by the power supply unit;
the inspection system is characterized in that it is provided with,
the inspection apparatus includes:
a conductor electrically connected to a ground line of the power supply unit when the power supply unit is inspected;
a load that consumes power supplied from the power supply unit;
and at least one dummy cable having one end electrically connected to the electrical conductor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019097002A JP6970140B2 (en) | 2019-05-23 | 2019-05-23 | Power supply unit inspection device |
| JP2019-097002 | 2019-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111983497A true CN111983497A (en) | 2020-11-24 |
| CN111983497B CN111983497B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010411487.8A Active CN111983497B (en) | 2019-05-23 | 2020-05-15 | Inspection device for power supply unit |
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| JP (1) | JP6970140B2 (en) |
| CN (1) | CN111983497B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020190524A (en) | 2020-11-26 |
| CN111983497B (en) | 2024-03-29 |
| JP6970140B2 (en) | 2021-11-24 |
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