CN107219427A - Power supply circuit and electromagnetic compatibility test system - Google Patents
Power supply circuit and electromagnetic compatibility test system Download PDFInfo
- Publication number
- CN107219427A CN107219427A CN201710501010.7A CN201710501010A CN107219427A CN 107219427 A CN107219427 A CN 107219427A CN 201710501010 A CN201710501010 A CN 201710501010A CN 107219427 A CN107219427 A CN 107219427A
- Authority
- CN
- China
- Prior art keywords
- power supply
- branch road
- power
- network
- supply branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000005611 electricity Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process 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
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
Embodiments of the invention provide a kind of power supply circuit and electromagnetic compatibility test system.Wherein, power supply circuit includes power branch, the first power supply branch road and the second power supply branch road；The first end of the power branch is the power connector end for connecting supply network, and the first end of the first end of the first power supply branch road and the second power supply branch road is both connected to the second end of the power branch；Inductor and first switch device are connected with the first power supply branch road；Second switch device is connected with the second power supply branch road.Using technical scheme, the impact failure that the relatively great start-up current of electrical equipment is caused to supply network can be effectively reduced.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of power supply circuit and electromagnetic compatibility test system.
Background technology
Emc testing (Electro Magnetic Compatibility, EMC) is many using artificial power net
Network (also known as source impedance stabilizing network, Line Impedance Stabilization Network, LISN) is to test product
Electro Magnetic Compatibility tested.When the starting current for running into test product is excessive, starting current and artificial mains network's
Rated current difference is larger so that the inductance value of artificial mains network is larger, causes the starting current of supply network larger, to supplying
Electric network causes certain impact failure.
When the starting current of test product is excessive, staff would generally change the larger artificial electricity of rated operational current
Source network.But, the rated operational current of artificial mains network is bigger, and volume is bigger, and cost is also higher, change rated current compared with
Big artificial mains network can increase testing cost, and increase operation difficulty.
The content of the invention
Embodiments of the invention provide a kind of power supply circuit and electromagnetic compatibility test system.
There is provided a kind of power supply circuit, including power branch, the first power supply for first aspect according to an embodiment of the invention
Branch road and the second power supply branch road；The first end of the power branch is the power connector end for connecting supply network, described
The first end of one power supply branch road and the first end of the second power supply branch road are both connected to the second end of the power branch；Described first
Inductor and first switch device are connected with power supply branch road；Second switch device is connected with the second power supply branch road.
Alternatively, in addition to the 3rd power supply branch road, it is described 3rd power supply branch road first end be connected to the power branch
The second end, it is described 3rd power supply branch road the second end be connected to it is described second power supply branch road the second end；3rd power supply
Capacitor and the 3rd switching device are connected with branch road.
Alternatively, after the first end of the 3rd power supply branch road is connected with the first end of the described first power supply branch road, pass through
4th switching device is connected to the second end of the power branch.
Alternatively, the capacitor is adjustable condenser.
Alternatively, the second end of the first power supply branch road is connected with the be adapted with the output end of artificial mains network
A connection piece；And/or, the second end of the second power supply branch road is connected with the be adapted with the input of artificial mains network
Two connectors.
Alternatively, the inductor is variable inductor.
Alternatively, it is connected with current sensing means on the power branch.
There is provided a kind of electromagnetic compatibility test system, including artificial power supply for second aspect according to an embodiment of the invention
Network and the as previously described power supply circuit of any one, the first power supply branch road of the power supply circuit and the artificial mains network
Output end connection, second power supply branch road be connected with the input of the artificial mains network.
Embodiments in accordance with the present invention are powered branch road, by by the power supply circuit be connected to supply network and electrical equipment it
Between, supply network is connected using power branch is set, and electrical equipment is entered using the power supply branch road for being connected with inductor
Row power supply, can be effectively reduced the impact failure that the relatively great start-up current of electrical equipment is caused to supply network, it is possible to
After electrical equipment steady operation, switching power supply circuit is electrical equipment stable power-supplying.
The electromagnetic compatibility test system of the embodiment of the present invention, by power supply circuit by between artificial mains network and supply network
Connect in succession, powered first come device under test using the power supply branch road for being connected with inductor, be effectively reduced Devices to test
Starting current to the impact failure of power network, and avoid impact failure of the starting current to artificial mains network；Moreover, need not
When the starting current of Devices to test is excessive, the larger artificial mains network of rated current is changed, electromagnetic compatibility test is reduced
Cost, it is and simple to operate.
Brief description of the drawings
Fig. 1 is a kind of structural representation of power supply circuit of embodiments of the invention one；
Fig. 2 is a kind of structural representation of electromagnetic compatibility test system of embodiments of the invention two.
Description of reference numerals：
10th, power branch；11st, power connector end；12nd, current sensing means；20th, the first power supply branch road；21st, inductor；
22nd, first switch device；23rd, the first connector；30th, the second power supply branch road；31st, second switch device；32nd, the second connector；
40th, the 3rd power supply branch road；41st, capacitor；42nd, the 3rd switching device；50th, the 4th switching device；60th, artificial mains network；70、
Devices to test.
Embodiment
Power supply circuit and electromagnetic compatibility test system below in conjunction with the accompanying drawings to embodiments of the invention is described in detail.
Embodiment one
Fig. 1 is a kind of structural representation of power supply circuit of embodiments of the invention.
As shown in figure 1, the power supply circuit of the present embodiment includes the power supply power supply branch of branch road 20 and second of power branch 10, first
Road 30.Wherein, the first end of power branch 10 is the power connector end 11 for connecting supply network, the first power supply branch road 20
First end and the first end of the second power supply branch road 30 are both connected to the second end of power branch 10；Connected on first power supply branch road 20
There are inductor 21 and first switch device 22；Second switch device 31 is connected with second power supply branch road 30.
In the power supply circuit of the present embodiment, power branch 10 can be connected by power connector end 11 with supply network,
The first power supply power supply branch road 30 of branch road 20 and second can be connected with electrical equipment, be power electrical apparatus.First is controlled first
Switching device 22 is closed, and second switch device 31 disconnects, and it is that electrical equipment is powered first to connect the first power supply branch road 20, from
And the impact failure caused when can be excessive using the starting current of the reduction electrical equipment of inductor 21 to supply network.Electric
After equipment steady operation, the operating current of electrical equipment is normal, second switch device 31 can be controlled to close, first switch device
22 disconnect, and connect first and power branch road 20 for electrical equipment stable power-supplying.
In actual application scenarios, it can apply electric what is be arbitrarily connected with power network in the power supply circuit of the present embodiment
In equipment, the power supply circuit is connected between electrical equipment and supply network.
Alternatively, the power supply circuit of the present embodiment is applied into electromagnetic compatibility test, the power supply circuit is connected to people
Between work electric power network and supply network.
In a kind of optional embodiment, power branch 10 is connected with supply network, by the first power supply branch road 20 and people
The output end connection of work electric power network, the second power supply branch road 30 is connected with the input of artificial mains network.Set by be measured
After standby access artificial mains network, control first switch device 22 is closed, and Devices to test is started using the first power supply branch road 20,
The impact failure that the relatively great start-up current of Devices to test is caused to supply network effectively can be reduced by inductor 21.Treating
After measurement equipment steady operation, second switch device 31 is closed, artificial mains network powered using the second power supply branch road, and by
Artificial mains network's device under test is powered, and carries out emc testing.
Alternatively, the second end of the first power supply branch road 20 is connected with first be adapted with the output end of artificial mains network
Connector 23；And/or, the second end of the second power supply branch road 30 is connected with second be adapted with the input of artificial mains network
Connector 32.First connector 23 and the second connector 32 can ensure connecting completely for the power supply circuit and artificial mains network
Connect, not influence impedance matching and the coupling feature of artificial mains network.
If for example, the connecting node of artificial mains network uses plug-in connected mode, the first connector 23 and second
Connector 32 can be respectively, the plug joint being adapted with the input and output end of artificial mains network.
Alternatively, it is connected with current sensing means 12 on power branch 10.In the present embodiment, current sensing means 12 can be with
For but be not limited to ammeter.
Current sensing means 12 can be used for when the closure of first switch device 22 connects the first power supply branch road 20, to detect
The starting current of electrical equipment (such as the above-mentioned Devices to test being connected in artificial mains network)；And, detect electrical equipment
Operating current, it is convenient by detecting whether operating current is stablized, come judge electrical equipment whether steady operation.Moreover, for
Above-mentioned electromagnetic compatibility test scheme, current sensing means can also detect artificial power net after the closure of second switch device 31
The operating current of network；And, according to the operating current of the Devices to test detected, to judge the nominal operation of artificial mains network
Whether electric current meets the operating current of the operating current Devices to test, and then determines whether to change artificial mains network, or really
Fixed suitable artificial mains network carrys out device under test and carries out electromagnetic compatibility test.
Alternatively, inductor 21 is variable inductor., can be by inductor 21 when connecting the power supply circuit of the present embodiment
Regulation is to larger inductance value, to improve impact resistance.After the first power supply branch road 20 is connected for power electrical apparatus, if opening
Streaming current starts reduction, can be by the inductance value of inductor 21 by turning down greatly, to improve the power supply capacity of the first power supply branch road 20.
In the present embodiment, the power supply circuit also includes the 3rd power supply branch road 40, and the first end of the 3rd power supply branch road 40 connects
The second end of power branch 10 is connected on, the second end of the 3rd power supply branch road 40 is connected to the second end of the second power supply branch road 30；The
The switching device 42 of capacitor 41 and the 3rd is connected with three power supply branch roads 40.
, can be by the second power supply branch road 30 and the when the power supply circuit of the present embodiment is applied into electromagnetic compatibility test
Three power supply branch roads 40 are connected to the input of artificial mains network, that is, with the second power supply power supply branch road 40 of branch road 30 and the 3rd
It is connected in parallel, the 3rd power supply branch road 40 can be used for charging to artificial mains network.Specifically, the first power supply branch road is being connected
20 be that during Devices to test is powered, if the operating current of Devices to test is stable, can close the 3rd switching device 42, is connected
3rd power supply branch road 40, using be connected with capacitor 41 the 3rd power supply branch road 40 be artificial mains network enter line precharge.
After charging complete, first switch device 22 and the 3rd switching device 42 are disconnected, closure second switch device 31 is connected second and powered
30 artificial mains networks of branch road carry out stable power-supplying.
Alternatively, capacitor 41 is adjustable condenser.Capacitor 41 is set to adjustable condenser, for adjusting to artificial
The charging rate of electric power network.For example, can be adjusted according to the rated operational current of artificial mains network or other characterisitic parameters
The capacitance of capacitor 41, prevents that artificial mains network's charging is too fast, and artificial mains network is caused to damage；And avoid artificial
Electric power network charged slowly, reduced testing efficiency.Here, adjustable condenser can adjustable condenser, or rotatably slidably
Adjustable condenser, the present embodiment is not construed as limiting to this.
Alternatively, after the first end of the 3rd power supply branch road 40 is connected with the first end of the first power supply branch road 20, the 4th is passed through
Switching device 50 is connected to the second end of power branch 10.
After artificial mains network's charging complete, direct deenergization branch can be carried out by disconnecting the 4th switching device 50
Connection between the power supply of the road 10 and first power supply branch road 40 of branch road 20 and the 3rd, first switch device 22 and the are disconnected without priority
Three switching devices 42.
Embodiments in accordance with the present invention are powered branch road, by by the power supply circuit be connected to supply network and electrical equipment it
Between, supply network is connected using power branch is set, and electrical equipment is entered using the power supply branch road for being connected with inductor
Row power supply, can be effectively reduced the impact failure that the relatively great start-up current of electrical equipment is caused to supply network, it is possible to
After electrical equipment steady operation, switching power supply circuit is electrical equipment stable power-supplying.The power supply branch road of the present embodiment is applied to
In electromagnetic compatibility test, it is connected between artificial mains network and supply network, prevents the starting current pair that Devices to test is excessive
Artificial mains network and supply network cause damage, efficiently solve starting current it is excessive when need change rated current it is larger
Artificial mains network the problem of.
Embodiment two
Fig. 2 is a kind of structural representation of electromagnetic compatibility test system of embodiments of the invention.The electromagnetism of the present embodiment
Compatibility test system uses the power supply circuit of above-described embodiment one, to connect artificial mains network and supply network.The present embodiment
In power supply circuit it is consistent with the structure of the power supply circuit of above-described embodiment one, repeat no more here.
As shown in Fig. 2 the electromagnetic compatibility test system of the present embodiment includes artificial mains network 60 and power supply circuit.Power supply
First power supply branch road 20 of circuit is connected with the output end of artificial mains network 60, the second power supply branch road 30 and artificial mains network
60 input connection.
In the electromagnetic compatibility test system of the present embodiment, Devices to test 70 can be connected in artificial mains network 60.This
In, Devices to test 70 is connected with the output end of artificial mains network 60, the annexation not shown in figure.By Devices to test 70
It is connected to artificial mains network 60, and after power branch 10 is connected with supply network, can be by first switch device 22
Closure, the power supply branch road 20 of connection first, is powered by the output end of artificial mains network 60 to Devices to test.Devices to test 70 is opened
Dynamic operation, inductor can reduce impact of the starting current to power network of Devices to test 70, and the inductance of adjustable inductance device 21
Value improves the power supply capacity of device under test 70.After the steady operation of Devices to test 70, the 3rd switching device 42 is closed,
The 3rd power supply branch road 40 is connected, artificial mains network 60 is charged by capacitor 41, and the electricity of tunable capacitor 41
Capacitance, to adjust charging rate.After the charging complete of artificial mains network 60, second switch device 31 can be closed, and
First switch device 22 and the 3rd switching device 42 (or disconnecting the 4th switching device 50) are disconnected, passes through the second power supply branch road 30
For the stable power-supplying of artificial mains network 60 so that artificial mains network 60 is stable, and device under test carries out emc testing.
Also, the operating current of Devices to test can also be detected by current sensing means 12, selection rated operational current is met will
The artificial mains network asked carries out emc testing.
Electromagnetic compatibility test system according to an embodiment of the invention, by power supply circuit by artificial mains network and power supply
Network is indirectly connected with, and is powered first come device under test using the power supply branch road for being connected with inductor, is effectively reduced and treats
The starting current of measurement equipment avoids impact failure of the starting current to artificial mains network to the impact failure of power network；And
And, without when the starting current of Devices to test is excessive, changing the larger artificial mains network of rated current, reduce electromagnetism simultaneous
Hold the cost of test, and it is simple to operate.
It may be noted that the need for according to implementation, all parts described in this application can be split as into more multi-part, also may be used
The part operation of two or more parts or part is combined into new part, to realize the purpose of the present invention.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of power supply circuit, it is characterised in that including power branch (10), the first power supply branch road (20) and the second power supply branch road
(30)；
The first end of the power branch (10) is the power connector end (11) for connecting supply network, the first power supply branch
The first end on road (20) and the first end of the second power supply branch road (30) are both connected to the second end of the power branch (10)；
Inductor (21) and first switch device (22) are connected with the first power supply branch road (20)；
Second switch device (31) is connected with the second power supply branch road (30).
2. power supply circuit according to claim 1, it is characterised in that also including the 3rd power supply branch road (40), the described 3rd
The first end of power supply branch road (40) is connected to the second end of the power branch (10), the second of the 3rd power supply branch road (40)
End is connected to the second end of the second power supply branch road (30)；
Capacitor (41) and the 3rd switching device (42) are connected with the 3rd power supply branch road (40).
3. power supply circuit according to claim 2, it is characterised in that the first end of the 3rd power supply branch road (40) and institute
After the first end connection for stating the first power supply branch road (20), the power branch (10) is connected to by the 4th switching device (50)
Second end.
4. power supply circuit according to claim 2, it is characterised in that the capacitor (41) is adjustable condenser.
5. power supply circuit according to claim 1, it is characterised in that the second end connection of the first power supply branch road (20)
There is the first connector (23) being adapted with the output end of artificial mains network；And/or,
Second end of the second power supply branch road (30) is connected with and the input of artificial mains network is adapted second is connected
Part (32).
6. power supply circuit according to any one of claim 1 to 5, it is characterised in that the inductor (21) is adjustable
Inductor.
7. power supply circuit according to any one of claim 1 to 5, it is characterised in that connect on the power branch (10)
It is connected to current sensing means (12).
8. a kind of electromagnetic compatibility test system, it is characterised in that including artificial mains network (60) and such as claim 1 to 7
Any one of power supply circuit, the first power supply branch road (20) of the power supply circuit is defeated with the artificial mains network (60)
Go out end connection, the second power supply branch road (30) is connected with the input of the artificial mains 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107219427A true CN107219427A (en) | 2017-09-29 |
| CN107219427B CN107219427B (en) | 2023-08-04 |
Family
ID=59950911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710501010.7A Active CN107219427B (en) | 2017-06-27 | 2017-06-27 | Power supply circuit and electromagnetic compatibility test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107219427B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497521A (en) * | 2022-11-08 | 2022-12-20 | 长鑫存储技术有限公司 | Power supply circuit, memory and electronic equipment |
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 |
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497521A (en) * | 2022-11-08 | 2022-12-20 | 长鑫存储技术有限公司 | Power supply circuit, memory and electronic equipment |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107219427B (en) | 2023-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106787055B (en) | A kind of charging circuit, system, method and terminal | |
| CN106208269B (en) | A kind of constant current constant voltage induction type wireless charging system | |
| CN203377585U (en) | Residual current protection circuit | |
| CN107994622A (en) | Battery power supply circuit | |
| CN106655470B (en) | A kind of uninterruptible power supply and its control method | |
| CN104579070B (en) | Contactless on-load automatic regulating distribution transformer and the method for carrying out automatic Regulation | |
| CN105914810A (en) | Method for charging electronic equipment, and electronic equipment | |
| CN107707128A (en) | Variable frequency driving circuit, system and direct current bus capacitor charging method | |
| CN108987073A (en) | Voltage transformer harmonic elimination apparatus and application method | |
| CN103558536A (en) | Circuit for testing overload tolerance capacity of series capacitor and working method of circuit | |
| CN107872090A (en) | A kind of energy-storage battery pre-charge circuit and pre-charge method | |
| CN205450144U (en) | Test auxiliary circuit discharges | |
| CN105912058B (en) | Stand-by circuit and electronic equipment | |
| CN108233461B (en) | Charging circuit and terminal equipment | |
| CN206945854U (en) | power supply circuit and electromagnetic compatibility test system | |
| CN107219427A (en) | Power supply circuit and electromagnetic compatibility test system | |
| CN101860226A (en) | Phase-locking switching type pre-charging circuit for high-voltage frequency converter and control method thereof | |
| CN102769323A (en) | Ultra-fast charge equipment for mobile phone batteries | |
| CN104038032B (en) | Low pressure pre-charge system and its control method for high voltage frequency conversion system | |
| CN103389442A (en) | Transformer substation electrical device alternating current withstand voltage resonance testing device | |
| CN203250173U (en) | Apparatus for controlling power supply | |
| CN105305858B (en) | Adaptive photovoltaic DC-to-AC converter | |
| CN105790326A (en) | Initial charging circuit for flow battery | |
| CN106291295A (en) | Pipe testing circuit and method between a kind of chain type STATCOM change of current end of the chain | |
| CN208655394U (en) | Voltage transformer harmonic elimination apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
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 |