CN107219427B - Power supply circuit and electromagnetic compatibility test system - Google Patents
Power supply circuit and electromagnetic compatibility test system Download PDFInfo
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- CN107219427B CN107219427B CN201710501010.7A CN201710501010A CN107219427B CN 107219427 B CN107219427 B CN 107219427B CN 201710501010 A CN201710501010 A CN 201710501010A CN 107219427 B CN107219427 B CN 107219427B
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- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The embodiment of the invention provides a power supply circuit and an electromagnetic compatibility test system. The power supply circuit comprises a power supply branch, a first power supply branch and a second power supply branch; the first end of the power supply branch is a power supply connecting end for connecting a power supply network, and the first end of the first power supply branch and the first end of the second power supply branch are both connected to the second end of the power supply branch; the first power supply branch is connected with an inductor and a first switching device; and a second switching device is connected to the second power supply branch. By adopting the technical scheme of the invention, impact damage to a power supply network caused by larger starting current of the electrical equipment can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power supply circuit and an electromagnetic compatibility testing system.
Background
Electromagnetic compatibility testing (Electro Magnetic Compatibility, EMC) is a test for electromagnetic compatibility of a product under test using a manual power supply network (also called a power supply impedance stabilizing network, line Impedance Stabilization Network, LISN). When the starting current of the tested product is overlarge, the difference value between the starting current and the rated current of the artificial power supply network is larger, so that the inductance of the artificial power supply network is larger, the starting current of the power supply network is larger, and certain impact damage is caused to the power supply network.
When the starting current of the tested product is too large, workers usually replace the artificial power supply network with larger rated working current. However, the larger the rated operating current of the artificial power supply network, the larger the volume and the higher the cost, the more the test cost is increased and the operation difficulty is increased by replacing the artificial power supply network with the larger rated current.
Disclosure of Invention
The embodiment of the invention provides a power supply circuit and an electromagnetic compatibility test system.
According to a first aspect of an embodiment of the present invention, there is provided a power supply circuit comprising a power supply branch, a first power supply branch and a second power supply branch; the first end of the power supply branch is a power supply connecting end for connecting a power supply network, and the first end of the first power supply branch and the first end of the second power supply branch are both connected to the second end of the power supply branch; the first power supply branch is connected with an inductor and a first switching device; and a second switching device is connected to the second power supply branch.
Optionally, the power supply system further comprises a third power supply branch, wherein the first end of the third power supply branch is connected with the second end of the power supply branch, and the second end of the third power supply branch is connected with the second end of the second power supply branch; the third power supply branch is connected with a capacitor and a third switching device.
Optionally, after the first end of the third power supply branch is connected to the first end of the first power supply branch, the third power supply branch is connected to the second end of the power supply branch through a fourth switching device.
Optionally, the capacitor is a tunable capacitor.
Optionally, the second end of the first power supply branch is connected with a first connecting piece which is matched with the output end of the artificial power supply network; and/or the second end of the second power supply branch is connected with a second connecting piece which is matched with the input end of the artificial power supply network.
Optionally, the inductor is an adjustable inductor.
Optionally, a current detection device is connected to the power branch.
According to a second aspect of embodiments of the present invention, there is provided an electromagnetic compatibility testing system comprising an artificial power supply network and a power supply circuit according to any of the preceding claims, a first power supply branch of the power supply circuit being connected to an output of the artificial power supply network, and a second power supply branch being connected to an input of the artificial power supply network.
According to the power supply branch circuit provided by the embodiment of the invention, the power supply circuit is connected between the power supply network and the electrical equipment, the power supply network is connected by the power supply branch circuit, and the electrical equipment is powered by the power supply branch circuit connected with the inductor, so that impact damage to the power supply network caused by larger starting current of the electrical equipment can be effectively reduced, and the power supply circuit can be switched to stably supply power to the electrical equipment after the electrical equipment stably works.
According to the electromagnetic compatibility testing system, the artificial power supply network is indirectly connected with the power supply network through the power supply circuit, the power supply branch connected with the inductor is used for supplying power to the equipment to be tested for the first time, so that impact damage of starting current of the equipment to be tested to a power grid is effectively reduced, and impact damage of the starting current to the artificial power supply network is avoided; moreover, when the starting current of the equipment to be tested is overlarge, the artificial power supply network with larger rated current is not required to be replaced, the cost of electromagnetic compatibility test is reduced, and the operation is simple.
Drawings
Fig. 1 is a schematic diagram of a power supply circuit according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electromagnetic compatibility testing system according to a second embodiment of the present invention.
Reference numerals illustrate:
10. a power supply branch; 11. a power supply connection terminal; 12. a current detection device; 20. a first power supply branch; 21. an inductor; 22. a first switching device; 23. a first connector; 30. a second power supply branch; 31. a second switching device; 32. a second connector; 40. a third power supply branch; 41. a capacitor; 42. a third switching device; 50. a fourth switching device; 60. an artificial power supply network; 70. and the device to be tested.
Detailed Description
The power supply circuit and the electromagnetic compatibility testing system according to the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic diagram of a power supply circuit according to an embodiment of the invention.
As shown in fig. 1, the power supply circuit of the present embodiment includes a power supply branch 10, a first power supply branch 20, and a second power supply branch 30. The first end of the power supply branch 10 is a power supply connection end 11 for connecting a power supply network, and the first end of the first power supply branch 20 and the first end of the second power supply branch 30 are both connected to the second end of the power supply branch 10; the first power supply branch 20 is connected with an inductor 21 and a first switching device 22; a second switching device 31 is connected to the second supply branch 30.
In the power supply circuit of the present embodiment, the power supply branch 10 may be connected to a power supply network through the power supply connection terminal 11, and the first power supply branch 20 and the second power supply branch 30 may be connected to an electrical device to supply power to the electrical device. First, the first switching device 22 is controlled to be closed, the second switching device 31 is opened, and the first power supply branch 20 is connected to supply power to the electrical equipment for the first time, so that impact damage to a power supply network caused by overlarge starting current of the electrical equipment can be reduced by using the inductor 21. After the electrical equipment stably works, the working current of the electrical equipment is normal, the second switching device 31 can be controlled to be closed, the first switching device 22 is opened, and the first power supply branch 20 is connected to stably supply power to the electrical equipment.
In an actual application scenario, the power supply circuit in this embodiment may be applied to any electrical device connected to a power grid, and the power supply circuit is connected between the electrical device and the power supply network.
Alternatively, the power supply circuit of the present embodiment is applied to an electromagnetic compatibility test, and is connected between a manual power supply network and a power supply network.
In an alternative embodiment, the power branch 10 is connected to a power supply network, the first power branch 20 is connected to an output of an artificial power supply network, and the second power branch 30 is connected to an input of the artificial power supply network. After the equipment to be tested is connected to the artificial power supply network, the first switching device 22 is controlled to be closed, the first power supply branch 20 is utilized to start the equipment to be tested, and impact damage caused by larger starting current of the equipment to be tested to the power supply network can be effectively reduced through the inductor 21. After the equipment to be tested stably works, the second switching device 31 is closed, the second power supply branch is used for supplying power to the artificial power supply network, and the artificial power supply network is used for supplying power to the equipment to be tested, so that electromagnetic compatibility test is performed.
Optionally, a first connector 23 adapted to the output end of the artificial power network is connected to the second end of the first power supply branch 20; and/or a second end of the second power supply branch 30 is connected to a second connection 32 adapted to an input of the artificial power supply network. The first connector 23 and the second connector 32 may ensure a complete connection of the power supply circuit to the artificial power supply network so as not to affect the impedance matching and coupling characteristics of the artificial power supply network.
For example, if the connection node of the artificial power network adopts a plug-in connection manner, the first connection member 23 and the second connection member 32 may be plug-in connectors adapted to the input end and the output end of the artificial power network, respectively.
Optionally, a current detection device 12 is connected to the power supply branch 10. In this embodiment, the current detecting device 12 may be, but is not limited to, an ammeter.
The current detecting means 12 may be configured to detect a starting current of an electrical device (e.g. a device to be tested connected to the artificial power network as described above) when the first switching means 22 is closed to switch on the first power supply branch 20; and detecting the working current of the electrical equipment, and judging whether the electrical equipment stably works by conveniently detecting whether the working current is stable. Moreover, for the above electromagnetic compatibility test scheme, the current detection device may also detect the working current of the artificial power network after the second switching device 31 is closed; and judging whether the rated working current of the artificial power supply network meets the working current of the equipment to be tested of the working current according to the detected working current of the equipment to be tested, and further determining whether to replace the artificial power supply network or determining a proper artificial power supply network to perform electromagnetic compatibility test on the equipment to be tested.
Alternatively, the inductor 21 is a tunable inductor. When the power supply circuit of the present embodiment is connected, the inductor 21 can be adjusted to a larger inductance value to improve the impact resistance. After the first power supply branch 20 is turned on to supply power to the electrical device, if the starting current starts to decrease, the inductance value of the inductor 21 may be reduced from large to small, so as to improve the power supply capability of the first power supply branch 20.
In this embodiment, the power supply circuit further includes a third power supply branch 40, a first end of the third power supply branch 40 is connected to the second end of the power supply branch 10, and a second end of the third power supply branch 40 is connected to the second end of the second power supply branch 30; a capacitor 41 and a third switching device 42 are connected to the third supply branch 40.
When the power supply circuit of the present embodiment is applied to the electromagnetic compatibility test, the second power supply branch 30 and the third power supply branch 40 may be connected to the input end of the artificial power supply network, that is, connected in parallel with the second power supply branch 30 and the third power supply branch 40, and the third power supply branch 40 may be used to charge the artificial power supply network. Specifically, in the process of switching on the first power supply branch 20 to supply power to the device under test, if the working current of the device under test is stable, the third switching device 42 may be closed, the third power supply branch 40 is switched on, and the third power supply branch 40 connected with the capacitor 41 is utilized to precharge the artificial power supply network. After the charging is completed, the first switch device 22 and the third switch device 42 are opened, the second switch device 31 is closed, and the second power supply branch 30-bit artificial power supply network is connected for stable power supply.
Optionally, the capacitor 41 is a tunable capacitor. The capacitor 41 is provided as an adjustable capacitor for adjusting the charging speed to the artificial power network. For example, the capacitance value of the capacitor 41 can be adjusted according to the rated working current or other characteristic parameters of the artificial power supply network, so that the artificial power supply network is prevented from being charged too fast and damaged; and avoid the artificial power network to charge too slowly, reduce the efficiency of test. Here, the tunable capacitor may be a sliding type tunable capacitor, or a rotating type tunable capacitor, which is not limited in this embodiment.
Optionally, after the first end of the third power supply branch 40 is connected to the first end of the first power supply branch 20, the third power supply branch is connected to the second end of the power supply branch 10 through the fourth switching device 50.
After the artificial power network charging is completed, the connection between the power supply branch 10 and the first power supply branch 20 and the third power supply branch 40 can be directly disconnected by opening the fourth switching device 50, without opening the first switching device 22 and the third switching device 42 in sequence.
According to the power supply branch circuit provided by the embodiment of the invention, the power supply circuit is connected between the power supply network and the electrical equipment, the power supply network is connected by the power supply branch circuit, and the electrical equipment is powered by the power supply branch circuit connected with the inductor, so that impact damage to the power supply network caused by larger starting current of the electrical equipment can be effectively reduced, and the power supply circuit can be switched to stably supply power to the electrical equipment after the electrical equipment stably works. The power supply branch circuit of the embodiment is suitable for being connected between the artificial power supply network and the power supply network in electromagnetic compatibility test, so that the damage to the artificial power supply network and the power supply network caused by the overlarge starting current of the equipment to be tested is prevented, and the problem that the artificial power supply network with larger rated current needs to be replaced when the starting current is overlarge is effectively solved.
Example two
Fig. 2 is a schematic structural diagram of an electromagnetic compatibility testing system according to an embodiment of the present invention. The electromagnetic compatibility testing system of the present embodiment adopts the power supply circuit of the first embodiment to connect the artificial power supply network and the power supply network. The power supply circuit in this embodiment is identical to the power supply circuit in the first embodiment, and will not be described here again.
As shown in fig. 2, the electromagnetic compatibility testing system of the present embodiment includes an artificial power supply network 60 and a power supply circuit. The first power supply branch 20 of the power supply circuit is connected to the output of the artificial power supply network 60, and the second power supply branch 30 is connected to the input of the artificial power supply network 60.
In the electromagnetic compatibility test system of the present embodiment, the device under test 70 may be connected in the artificial power supply network 60. Here, the device under test 70 is connected to an output terminal of the artificial power supply network 60, which connection is not shown in the figure. After connecting the device under test 70 to the artificial power network 60 and connecting the power branch 10 to the supply network, the first switching means 22 may be closed, communicating with the first supply branch 20, supplying power to the device under test via the output of the artificial power network 60. The device under test 70 starts to operate, the inductor can reduce impact of starting current of the device under test 70 on a power grid, and the inductance value of the inductor 21 can be adjusted to improve the power supply capability of the device under test 70. After the device under test 70 stably operates, the third switching device 42 is closed and is communicated with the third power supply branch 40, the artificial power supply network 60 is charged through the capacitor 41, and the capacitance value of the capacitor 41 can be adjusted to adjust the charging speed. After the artificial power supply network 60 is charged, the second switching device 31 may be closed, and the first switching device 22 and the third switching device 42 may be opened (or the fourth switching device 50 may be opened), so that the artificial power supply network 60 is stably supplied with power through the second power supply branch 30, so that the artificial power supply network 60 stably performs an electromagnetic compatibility test on the device under test. And, can also detect the operating current of the apparatus to be measured through the electric current detection device 12, choose the artificial power network that the rated operating current meets the requirement to carry on the electromagnetic compatibility test.
According to the electromagnetic compatibility testing system provided by the embodiment of the invention, the artificial power supply network is indirectly connected with the power supply network through the power supply circuit, the power supply branch connected with the inductor is utilized to supply power to the equipment to be tested for the first time, so that the impact damage of the starting current of the equipment to be tested to the power grid is effectively reduced, and the impact damage of the starting current to the artificial power supply network is avoided; moreover, when the starting current of the equipment to be tested is overlarge, the artificial power supply network with larger rated current is not required to be replaced, the cost of electromagnetic compatibility test is reduced, and the operation is simple.
It should be noted that each component described in the present application may be split into more components, or two or more components or partial operations of the components may be combined into new components according to the implementation needs, so as to achieve the object of the present invention.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A power supply circuit, characterized by comprising a power supply branch (10), a first power supply branch (20) and a second power supply branch (30);
the first end of the power supply branch circuit (10) is a power supply connection end (11) for connecting a power supply network, and the first end of the first power supply branch circuit (20) and the first end of the second power supply branch circuit (30) are both connected to the second end of the power supply branch circuit (10);
the first power supply branch circuit (20) is connected with an inductor (21) and a first switching device (22);
a second switching device (31) is connected to the second power supply branch (30); the power supply system further comprises a third power supply branch circuit (40), wherein the first end of the third power supply branch circuit (40) is connected with the second end of the power supply branch circuit (10), and the second end of the third power supply branch circuit (40) is connected with the second end of the second power supply branch circuit (30);
the third power supply branch circuit (40) is connected with a capacitor (41) and a third switching device (42);
the second end of the first power supply branch circuit (20) is connected with a first connecting piece (23) which is matched with the output end of the artificial power supply network; and/or the number of the groups of groups,
a second end of the second power supply branch circuit (30) is connected with a second connecting piece (32) which is matched with the input end of the artificial power supply network;
the inductor (21) is an adjustable inductor;
the power supply branch circuit (10) is connected with a current detection device (12).
2. The power supply circuit according to claim 1, characterized in that the first end of the third power supply branch (40) is connected to the first end of the first power supply branch (20) and then to the second end of the power supply branch (10) via a fourth switching means (50).
3. A supply circuit according to claim 1, characterized in that the capacitor (41) is an adjustable capacitor.
4. An electromagnetic compatibility testing system, characterized by comprising an artificial power supply network (60) and a power supply circuit according to any of claims 1 to 3, a first power supply branch (20) of the power supply circuit being connected to an output of the artificial power supply network (60), a second power supply branch (30) being connected to an input of the artificial power supply network (60).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710501010.7A CN107219427B (en) | 2017-06-27 | 2017-06-27 | Power supply circuit and electromagnetic compatibility test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710501010.7A CN107219427B (en) | 2017-06-27 | 2017-06-27 | Power supply circuit and electromagnetic compatibility test system |
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| Publication Number | Publication Date |
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| CN107219427A CN107219427A (en) | 2017-09-29 |
| CN107219427B true CN107219427B (en) | 2023-08-04 |
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| CN201710501010.7A Active CN107219427B (en) | 2017-06-27 | 2017-06-27 | Power supply circuit and electromagnetic compatibility test system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115497521B (en) * | 2022-11-08 | 2023-02-17 | 长鑫存储技术有限公司 | Power supply circuit, memory and electronic equipment |
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| CN2713479Y (en) * | 2004-08-06 | 2005-07-27 | 杭州远方光电信息有限公司 | A symmetric artificial power supply network |
| CN203377777U (en) * | 2013-08-09 | 2014-01-01 | 广东易事特电源股份有限公司 | A soft start circuit of an auxiliary power supply |
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| CN105301381A (en) * | 2014-07-31 | 2016-02-03 | 展讯通信（上海）有限公司 | Automatic surge testing system and testing method |
| CN105827103A (en) * | 2015-01-05 | 2016-08-03 | 华为技术有限公司 | Surge current preventing circuit and power supply |
| CN105974306A (en) * | 2016-06-30 | 2016-09-28 | 国家电网公司 | Intelligent test device, system and test method for oscillating characteristic of direct current breaker |
| CN206945854U (en) * | 2017-06-27 | 2018-01-30 | 天津市滨海新区军民融合创新研究院 | power supply circuit and electromagnetic compatibility test system |
-
2017
- 2017-06-27 CN CN201710501010.7A patent/CN107219427B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2713479Y (en) * | 2004-08-06 | 2005-07-27 | 杭州远方光电信息有限公司 | A symmetric artificial power supply network |
| CN203377777U (en) * | 2013-08-09 | 2014-01-01 | 广东易事特电源股份有限公司 | A soft start circuit of an auxiliary power supply |
| CN203630252U (en) * | 2013-12-24 | 2014-06-04 | 珠海格力电器股份有限公司 | test circuit, device and system of household appliance |
| CN105301381A (en) * | 2014-07-31 | 2016-02-03 | 展讯通信（上海）有限公司 | Automatic surge testing system and testing method |
| CN105827103A (en) * | 2015-01-05 | 2016-08-03 | 华为技术有限公司 | Surge current preventing circuit and power supply |
| CN105974306A (en) * | 2016-06-30 | 2016-09-28 | 国家电网公司 | Intelligent test device, system and test method for oscillating characteristic of direct current breaker |
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Address after: 300459 No.399 Huixiang Road, Tanggu ocean hi tech Zone, Binhai New Area, Tianjin Patentee after: Tianjin Institute of advanced technology Country or region after: China Address before: 300459 No.399 Huixiang Road, Tanggu ocean hi tech Zone, Binhai New Area, Tianjin Patentee before: TIANJIN BINHAI CIVIL-MILITARY INTEGRATED INNOVATION INSTITUTE Country or region before: China |