CN205385408U - Capacitor filter device, converter major loop and converter - Google Patents
Capacitor filter device, converter major loop and converter Download PDFInfo
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- CN205385408U CN205385408U CN201521105480.4U CN201521105480U CN205385408U CN 205385408 U CN205385408 U CN 205385408U CN 201521105480 U CN201521105480 U CN 201521105480U CN 205385408 U CN205385408 U CN 205385408U
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Abstract
The utility model provides a capacitor filter device, converter major loop and converter, first electric capacity, second electric capacity and third electric capacity constitute X differential mode filter capacitance group for differential mode interference part in three -phase grid three -phase output terminal filtering oading equipment is to electric wire netting conducted interference, fourth electric capacity passes through earthing switch ground connection and constitutes Y common mode filter electric capacity group for common mode interference part in three -phase grid three -phase output terminal filtering oading equipment is to electric wire netting conducted interference. Because switching on and breaking off of earthing switch can be controlled through a switch portion spare ground connection as required to the three -phase grid three -phase output terminal capacitor filter device to solve different EMC problems, so can be used for different application scenarios in a flexible way.
Description
Technical field
The application relates to a kind of capacitor filtering device, is specifically related to be connected to the capacitor filtering device of a kind of three phase network three-phase output end, the main circuit of frequency converter including this capacitor filtering device and converter.
Background technology
Electrical equipment is directly accessed three phase network and can face numerous EMC problems, if converter is the power converter apparatus for providing voltage regulation and frequency modulation power supply to motor, the major loop of converter generally comprises rectification circuit and inverter circuit, the three-phase input end of rectification circuit connects three-phase alternating current and is rectified into unidirectional current, sending inverter circuit to by positive and negative dc bus, this DC inverter is become the adjustable alternating current of frequency, amplitude and is exported by three-phase output end by inverter circuit.
Converter faces numerous EMC (Electro Magnetic Compatibilities in the course of the work, ElectroMagneticCompatibility) problem, including electrical network Conduction Interference problem, cross-interference issue, leakage problem, powered on moment due to voltage spikes problem, outer casing electrification problem etc..Wherein, electrical network Conduction Interference problem is owing to the break-make of the device for power switching in converter such as IGBT, diode can produce strong electromagnetic such as common mode disturbances, differential mode interference, if converter is directly accessed electrical network, produce electrical network Conduction Interference, pollute electrical network and disturb other electromagnetic susceptibility equipment of electrical network, in order to filter electrical network Conduction Interference, often install capacitor filtering device additional in converter power supply port.
Refer to Fig. 1, in prior art, the electrical block diagram of the capacitor filtering device of a kind of converter.
Wherein, the X capacitance group of C4, C5, C6 composition is for filtering converter to the differential mode interference part in electrical network Conduction Interference；The Y capacitance group of C1, C2, C3 composition is for filtering converter to the common mode disturbances part in electrical network Conduction Interference.
The capacitor filtering device of above-mentioned converter can solve the converter Conduction Interference problem to electrical network.But, this capacitor filtering device can not solve other EMC problem of ground cross-interference issue, leakage problem, powered on moment due to voltage spikes problem etc..
Summary of the invention
A kind of capacitor filtering device, main circuit of frequency converter and the converter that the application provides, can solve the EMC problem that three phase network three-phase output end faces neatly according to application scenario, and converter face electrical network Conduction Interference problem, the EMC problems such as cross-interference issue, leakage problem, powered on moment due to voltage spikes problem, outer casing electrification problem.
First aspect according to the application, this application provides a kind of capacitor filtering device, including for being connected to the first-level filtering wave circuit on three phase network three-phase output end；Described first-level filtering wave circuit includes the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and earthed switch；First end of the first electric capacity is for connecting the first end of three phase network three-phase output end, and the first end of the second electric capacity is for connecting the second end of three phase network three-phase output end, and the first end of the 3rd electric capacity is for connecting the 3rd end of three phase network three-phase output end；First electric capacity, the second electric capacity, the 3rd electric capacity second end connect the 4th electric capacity the first end；Second end of the 4th electric capacity connects the first end of earthed switch；Second end of earthed switch is used for ground connection.
In one embodiment, described capacitor filtering device also includes for being connected to the secondary filter circuit on the positive and negative bus end of three phase network load equipment.
In one embodiment, described secondary filter circuit includes the 6th electric capacity and the 7th electric capacity, first end of the 6th electric capacity is used for connecting positive bus-bar end, and the first end of the 7th electric capacity is used for connecting negative busbar end, the 6th electric capacity, the 7th electric capacity the second end be connected to the first end of earthed switch.
In one embodiment, described secondary filter circuit also includes the 5th electric capacity, and the two ends of the 5th electric capacity are respectively used to connect positive and negative bus end.
In one embodiment, described three phase network load circuit is rectified three-phase circuit.
In one embodiment, described earthed switch is jumper switch.
Second aspect according to the application, present invention also provides a kind of main circuit of frequency converter, and the major loop of described converter includes rectified three-phase circuit, and the three-phase input end of described main circuit of frequency converter is for being connected with the three-phase output end of three phase network；Described main circuit of frequency converter also includes any one capacitor filtering device being connected with three phase network three-phase output end above-mentioned.
The third aspect according to the application, present invention also provides a kind of converter, including above-mentioned main circuit of frequency converter.
Capacitor filtering device, main circuit of frequency converter and the converter that the application provides, first electric capacity, the second electric capacity and the 3rd electric capacity composition X differential mode filter capacitor group, for filtering load equipment to the differential mode interference part in electrical network Conduction Interference at three phase network three-phase output end；4th electric capacity constitutes Y common mode filtering capacitance group by ground switch earthing, for filtering load equipment to the common mode disturbances part in electrical network Conduction Interference at three phase network three-phase output end.Owing to capacitor filtering device is by a switch block ground connection, it is possible to as desired to control conducting and the disconnection of earthed switch, to solve different EMC problems, so can be used for different application occasion flexibly.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram figure of the capacitor filtering device of a kind of converter in prior art；
Fig. 2 is the structural representation of the capacitor filtering device in the embodiment of the present application one；
Fig. 3 is the structural representation of the capacitor filtering device in the embodiment of the present application one；
Fig. 4 is the structural representation of the capacitor filtering device in the embodiment of the present application one；
Fig. 5 is the structural representation of main circuit of frequency converter in the embodiment of the present application two；
Fig. 6 is the electrical block diagram of capacitor filtering device in the embodiment of the present application two；
When Fig. 7 is earthed switch J1 conducting, the current spike schematic diagram that converter powered on moment causes；
When Fig. 8 is earthed switch J1 disconnection, the current spike schematic diagram that converter powered on moment causes；
Fig. 9 is the annexation schematic diagram of each equipment in frequency convertor system；
When Figure 10 is converter operation, the interference return flow path schematic diagram of common mode current；
When Figure 11 is earthed switch J1 conducting, the due to voltage spikes clutter schematic diagram of superposition on F-IPMU signal；
When Figure 12 is earthed switch J1 disconnection, the due to voltage spikes clutter schematic diagram of superposition on F-IPMU signal.
Detailed description of the invention
The application is described in further detail in conjunction with accompanying drawing below by detailed description of the invention.
Embodiment one
Based on various EMC problems electrical equipment accessed existing for three phase network, the topological circuit of filter capacitor in prior art is adjusted by the present invention, increase earthed switch J1 at Y capacitance ground connection place, thus solving to access electrical equipment the various EMC problems of three phase network flexibly simultaneously.
Refer to Fig. 2, present embodiments provide a kind of capacitor filtering device, including for being connected to the first-level filtering wave circuit on three phase network three-phase output end (R S T).First-level filtering wave circuit includes the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and earthed switch J1；First end of the first electric capacity C1 is for connecting the first end R of three phase network three-phase output end, first end of the second electric capacity C2 is for connecting the second end S of three phase network three-phase output end, and first end of the 3rd electric capacity C3 is for connecting the 3rd end T of three phase network three-phase output end；First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 second end connect the 4th electric capacity C4 the first end；Second end of the 4th electric capacity C4 connects first end of earthed switch J1；Second end of earthed switch J1 is used for ground connection.
Concrete, earthed switch J1 can be jumper switch.In other embodiments, earthed switch J1 can select the switch of different types according to the actual requirements.
The capacitor filtering device that the present embodiment provides, first electric capacity C1, the second electric capacity C2 and the three electric capacity C3 form X differential mode filter capacitor group, for filtering load equipment (electrical equipment, such as power supply unit or electrical equipment) to the differential mode interference part in electrical network Conduction Interference at three phase network three-phase output end；4th electric capacity C4 constitutes Y common mode filtering capacitance group by earthed switch J1 ground connection, for filtering load equipment to the common mode disturbances part in electrical network Conduction Interference at three phase network three-phase output end.Owing to capacitor filtering device is by a switch block ground connection, it is possible to as desired to control conducting and the disconnection of earthed switch J1, to solve different EMC problems, so can be used for different application occasion flexibly.
Refer to Fig. 3, it is preferred that in the present embodiment, capacitor filtering device also includes for being connected to the secondary filter circuit on the positive and negative bus end of three phase network load equipment circuit.It should be noted that three phase network load equipment can be the equipment comprising rectified three-phase circuit, further, this rectified three-phase circuit can be the rectified three-phase circuit (as shown in Figure 4) in converter.
Concrete, secondary filter circuit includes the 6th electric capacity C6 and the seven electric capacity C7, first end of the 6th electric capacity C6 is used for connecting positive bus-bar end, and first end of the 7th electric capacity C7 is used for connecting negative busbar end, the 6th electric capacity C6, the 7th electric capacity C7 the second end be connected to first end of earthed switch J1.
6th electric capacity C6, the 7th electric capacity C7 are respectively used to connect positive and negative bus end and by earthed switch J1 ground connection, thus forming the Y common mode filtering capacitance group of positive and negative bus, are used for further filtering out common mode disturbances part corresponding in electrical network Conduction Interference.
Further, secondary filter circuit also includes the 5th electric capacity C5, and the two ends of the 5th electric capacity C5 are respectively used to connect positive and negative bus end.
5th electric capacity C5 is used for connecting positive and negative bus end, constitutes X differential mode filter capacitor, is used for reducing bus differential mode interference, reduces external radiation interference.
Concrete, C1, C2, C3 capacitance can be identical, and C6, C7 capacitance can be identical, and the concrete capacitance of each electric capacity selects according to required filter effect and practical situation.
It should be noted that, secondary filter circuit is constituted by the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, boostfiltering effect, can more preferably solve the load equipment Conduction Interference problem to electrical network, in certain embodiments, if capacitor filtering device only includes the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and earthed switch J1 can also solve technical problems to be solved in this application.
It addition, the capacitor filtering device of the three phase network three-phase output end of the present embodiment offer goes for various load equipment, for instance converter.
Embodiment two
Refer to Fig. 5, access the various EMC problems existing for three phase network based on converter, the invention provides a kind of main circuit of frequency converter 101, the three-phase input end of main circuit of frequency converter is connected with the three-phase output end of three phase network.Common, major loop 101 includes capacitor filtering device 102, rectification circuit 103 and inverter circuit 104, the three-phase input end (R, S, T) of rectification circuit 103 connects three-phase alternating current and is rectified into unidirectional current, sending inverter circuit 104 to by positive and negative bus end, this DC inverter is become the adjustable alternating current of frequency, amplitude and includes rectified three-phase circuit by three-phase output end (U, V, W) output by inverter circuit 104.
Capacitor filtering device 102 is connected on three-phase input end (R, S, T) and bus end.
Refer to Fig. 6, in the present embodiment, capacitor filtering device 102 includes the first-level filtering wave circuit being connected on major loop 101 three-phase input end.First-level filtering wave circuit includes the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and earthed switch J1；First end of the first electric capacity C1 connects the 3rd end T of the first end connection converter three-phase input end of the second end S, the 3rd electric capacity C3 of the first end connection converter three-phase input end of the first end R, the second electric capacity C2 of converter three-phase input end；First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 second end connect the 4th electric capacity C4 the first end；Second end of the 4th electric capacity C4 connects first end of earthed switch J1；Second end of earthed switch J1 is used for ground connection.
Concrete, earthed switch J1 can be jumper switch.In other embodiments, earthed switch J1 can select the switch of different types according to the actual requirements.
In the present embodiment, the first electric capacity C1, the second electric capacity C2 and the three electric capacity C3 form X differential mode filter capacitor group, for filtering converter to the differential mode interference part in electrical network Conduction Interference；4th electric capacity C4 passes through earthed switch J1 ground connection, first electric capacity C1 and the four electric capacity C4, the second electric capacity C2 and the four electric capacity C4, the 3rd electric capacity C3 and the four electric capacity C4 constitute Y common mode filtering capacitance group, for filtering converter to the common mode disturbances part in electrical network Conduction Interference.Therefore, it can the conducting by controlling earthed switch J1 and disconnection, selectively solve different EMC problems, for different application occasion.
In the present embodiment, it is preferred that capacitor filtering device 102 also includes the secondary filter circuit being connected on the positive and negative bus end of major loop.Secondary filter circuit includes the 6th electric capacity C6 and the seven electric capacity C7, the 6th electric capacity C6, first end of the 7th electric capacity C7 connects positive and negative bus end respectively, and its second end is connected to first end of earthed switch J1.
6th electric capacity C6, the 7th electric capacity C7 connect positive and negative bus end and respectively by earthed switch J1 ground connection, thus forming the Y common mode filtering capacitance group of positive and negative bus, for further filtering out converter to the common mode disturbances part in electrical network Conduction Interference.
Further, secondary filter circuit also includes the 5th electric capacity C5, and the two ends of the 5th electric capacity C5 connect positive and negative bus end respectively.
5th electric capacity C5 connects positive and negative bus end, constitutes X differential mode filter capacitor, is used for reducing bus differential mode interference, reduces the external radiation interference of converter.
Concrete, C1, C2, C3 capacitance can be identical, and C6, C7 capacitance can be identical, and the concrete capacitance of each electric capacity selects according to required filter effect and practical situation.
It should be noted that, secondary filter circuit is constituted by the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, boostfiltering effect, can more preferably solve the converter Conduction Interference problem to electrical network, in certain embodiments, if capacitor filtering device 102 only includes the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and earthed switch J1 can also solve technical problems to be solved in this application.
In the actually used process of converter, the EMC problem that user can solve according to actual needs, be turned on or off earthed switch J1, thus solving corresponding EMC problem；
Wherein it is desired to the occasion disconnecting earthed switch J1 includes:
1, mainly need to reduce converter leakage current, it is prevented that earth leakage circuit-breaker misoperation during on-the-spot application；
2, mainly need to reduce the current spike that converter powered on moment causes；
3, mainly need to reduce converter common mode current over the ground (avoiding ground crosstalk), to prevent converter from causing the interference of common ground sensitive equipment；
The occasion needing conducting earthed switch J1 includes:
1, mainly need to reduce the charged of shell of frequency converter；
2, mainly need to reduce the converter Conduction Interference to electrical network.
When converter dispatches from the factory; earthed switch J1 is acquiescence ground connection; when converter brings into operation; X differential mode filter capacitor and Y common mode filtering capacitance group is mainly utilized to reduce the converter Conduction Interference to electrical network; when occur when converter runs leakage current, current spike, the problems such as crosstalk; and these problems have influence on the running status of equipment, during as caused the misoperation protecting switch, only need to disconnect earthed switch J1.
Below by contrast earthed switch J1 respectively when conducting and disconnection, it is how to solve EMC problem.
(1) when earthed switch J1 disconnects, it is possible to solve following EMC problem:
1, converter leakage problem is solved
When earthed switch J1 turns on, converter circuit ground connection, during with composition loop, ground, this loop can be passed through and produce certain leakage current.Refer to table 1 below, when disconnecting for earthed switch and turn on, the impact of converter complete machine leakage current is contrasted.
Table 1:
| Carrier frequency | Running frequency | Whether earthed switch turns on | Complete machine leakage current |
| 1.5KHz | 50Hz | It is | 40.5mA |
| 4KHz | 50Hz | It is | 90.2mA |
| 1.5KHz | 50Hz | No | 27.4mA |
| 4KHz | 50Hz | No | 48.8mA |
Wherein, carrier frequency refers to that the device for power switching determining converter is (such as the frequency of the number of times opened with turn off IGBT).Running frequency refers to the frequency of converter output PWM waveform.
As it can be seen from table 1 when earthed switch J1 disconnects, compared with turning on earthed switch J1; leakage current can reduce by tens and arrive tens of milliamperes; namely when earthed switch J1 disconnects, it is possible to effectively reduce converter leakage current, thus effectively preventing the situation of earth leakage circuit-breaker misoperation.
2, the current spike problem that converter powered on moment causes is solved
Owing to converter filter capacitor group has Y capacitance over the ground, when converter powered on moment, the du/dt that supply voltage produces can form current spike in Y capacitance, and the size of spike depends on Y capacitance capacitance size.
Refer to Fig. 7 and Fig. 8, Fig. 7 be earthed switch J1 conducting time, the current spike that converter powered on moment causes, its value is about 26.2A；When Fig. 8 is earthed switch J1 disconnection, the current spike that converter powered on moment causes, its value is about 4.1A.
Therefore, by Fig. 7 and Fig. 8 it can be seen that when earthed switch J1 disconnects, compared with carrying out with earthed switch J1 conducting, can effectively reduce the current spike caused, thus preventing the earth leakage circuit-breaker misoperation that current spike causes.
3, converter common mode current problem over the ground (cross-interference issue) is solved
In some occasion, each assembly has special ground connection relation, converter and other equipment composition whole set of system.As shown in Figure 9, in certain frequency convertor system, shell of frequency converter is connected with the shell of sensitive equipment 1 and sensitive equipment 2, and sensitive equipment 2 shell is connected to power work ground eventually through ground wire, is attached by shielding line between sensitive equipment 1 shell and sensitive equipment 2 shell.
Refer to Figure 10, when converter runs, the internal IGBT speed-sensitive switch action of converter produces du/dt, common mode current is produced by distribution capacity being carried out discharge and recharge, owing to whole system is connected to place of working by sensitive equipment 1 and sensitive equipment 2, therefore common mode current can flow through the screen layer between sensitive equipment 1 and sensitive equipment 2, then passes through the distribution capacity within shielding line to disturb internal signal wire.The flow direction of common mode current shown in dotted line 1,2,3,4,5, wherein, flows mostly to as follows respectively in Fig. 9:
IGBT action produces du/dt, distribution capacity between IGBT and radiator forms common mode current, common mode current flows to sensitive equipment 1 shell through shell of frequency converter with the path of dotted line 2, shielding line is flowed to again with the path of dotted line 4, flow to sensitive equipment 2 shell with the path of dotted line 5 again, be namely finally connected to place of working.Wherein, when common mode current flows through the shielding line between sensitive equipment 1 and sensitive equipment 2, disturb internal signal by the distribution capacity between shielding line internal signal wire, and internal interference signals is used for controlling the duty of sensitive equipment；Common mode current can also flow directly into ground with the path of dotted line 3 simultaneously.
Refer to table 2, table 2 represents the internal disturbed signal of shielding line, contrast earthed switch J1 conducting and the disturbed condition of F-IPMU signal when disconnecting with F-IPMU signal.
Table 2:
Therefore, by table 2 it can be seen that when earthed switch J1 disconnects, turn on earthed switch J1 into compared with, can effectively reduce converter common mode current over the ground (crosstalk), to prevent the interference to the current sense equipment in its loop of the converter common mode current.
(2) when earthed switch J1 turns on, it is possible to solve following EMC problem:
1, shell of frequency converter Issues on Static Electrification is solved
Frequency convertor system is in earth-free situation, and owing to converter and motor all can produce common mode current over the ground, time earth-free, common mode current cannot be released, and accumulates on converter metal shell, thus causing the situation of outer casing electrification.Its electrified voltage can exceed human safety voltage (exchange 30V, direct current 50V) in some cases, brings potential safety hazard.
Refer to table 3, for earthed switch J1 conducting and the contrast of converter outer casing electrification situation when disconnecting.
By table 3 it can be seen that turned on by earthed switch J1, converter passes through Y capacitance ground connection, make common mode current pass through Y capacitance and flow to ground, will not at the too much electricity of shell place accumulation, thus effectively reducing the voltage of shell of frequency converter to human safety voltage, it is ensured that the safety that user uses.
2, the converter conduction interference to electrical network is reduced, to protect other sensitive equipments in same electrical network interference-free.
Owing to converter and motor internal distribution capacity can cause converter to produce common-mode interference current over the ground after running, use test instrunment receiver to can be determined that this equipment under test interference strength to electrical network with the LISN common-mode voltage testing equipment under test, measure in units of dBuV.After loading onto J1 wire jumper, the Y capacitance of its filter capacitor group reduces frequency convertor system common mode current loops, can effectively filter the later conduction interference of converter 500KHz.Its conduction interference data the highest reduction 46dBuV compared with not filling J1 wire jumper.In the present embodiment, being illustrated by way of example the earthed switch J1 part EMC problem that can solve the problem that respectively when conducting and disconnection, in the actually used process of converter, user can according to encountered concrete EMC problem, control conducting and the disconnection of earthed switch J1, to solve corresponding problem.
Capacitor filtering device, main circuit of frequency converter and the converter that the embodiment of the present application provides, it is possible to better adapt to the on-the-spot ruuning situation of converter, has higher motility when solving various EMC problem.
Above content is further description the application made in conjunction with specific embodiment, it is impossible to assert the application be embodied as be confined to these explanations.For the application person of an ordinary skill in the technical field, under the premise conceived without departing from the present application, it is also possible to make some simple deduction or replace.
Claims (8)
1. a capacitor filtering device, it is characterised in that include the first-level filtering wave circuit for being connected on three phase network three-phase output end；Described first-level filtering wave circuit includes the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and earthed switch；First end of the first electric capacity is for connecting the first end of three phase network three-phase output end, and the first end of the second electric capacity is for connecting the second end of three phase network three-phase output end, and the first end of the 3rd electric capacity is for connecting the 3rd end of three phase network three-phase output end；First electric capacity, the second electric capacity, the 3rd electric capacity second end connect the 4th electric capacity the first end；Second end of the 4th electric capacity connects the first end of earthed switch；Second end of earthed switch is used for ground connection.
2. capacitor filtering device as claimed in claim 1, it is characterised in that also include for being connected to the secondary filter circuit on the positive and negative bus end of three phase network load circuit.
3. capacitor filtering device as claimed in claim 2, it is characterized in that, described secondary filter circuit includes the 6th electric capacity and the 7th electric capacity, first end of the 6th electric capacity is used for connecting positive bus-bar end, first end of the 7th electric capacity is used for connecting negative busbar end, the 6th electric capacity, the 7th electric capacity the second end be connected to the first end of earthed switch.
4. capacitor filtering device as claimed in claim 3, it is characterised in that described secondary filter circuit also includes the 5th electric capacity, and the two ends of the 5th electric capacity are respectively used to connect positive and negative bus end.
5. capacitor filtering device as claimed in claim 2, it is characterised in that described three phase network load circuit includes rectified three-phase circuit.
6. the capacitor filtering device as described in claim 1-5 any one, it is characterised in that described earthed switch is jumper switch.
7. a main circuit of frequency converter, the major loop of described converter includes rectified three-phase circuit, the three-phase input end of described main circuit of frequency converter is connected with the three-phase output end of three phase network, it is characterized in that, also include the capacitor filtering device being connected with three phase network three-phase output end as described in claim 1-6 any one.
8. a converter, it is characterised in that include main circuit of frequency converter as claimed in claim 7.
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| CN201521105480.4U CN205385408U (en) | 2015-12-25 | 2015-12-25 | Capacitor filter device, converter major loop and converter |
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| CN201521105480.4U CN205385408U (en) | 2015-12-25 | 2015-12-25 | Capacitor filter device, converter major loop and converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451697A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Mobile terminal and common mode interference resistance method |
| CN106487208A (en) * | 2016-11-28 | 2017-03-08 | 阳光电源股份有限公司 | A kind of inverter ac cable suppressing method of common-mode voltage and device over the ground |
| EP3742595A1 (en) * | 2019-05-21 | 2020-11-25 | Schneider Electric IT Corporation | Surge protection circuit with integrated surveillance |
| CN113381596A (en) * | 2020-03-09 | 2021-09-10 | 株洲中车奇宏散热技术有限公司 | Method for reducing overvoltage of wind power generator side filter |
| CN113945786A (en) * | 2021-10-11 | 2022-01-18 | 海检检测有限公司 | Automatic optimization device and optimization method for conducted disturbance parameters |
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2015
- 2015-12-25 CN CN201521105480.4U patent/CN205385408U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451697A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Mobile terminal and common mode interference resistance method |
| CN106487208A (en) * | 2016-11-28 | 2017-03-08 | 阳光电源股份有限公司 | A kind of inverter ac cable suppressing method of common-mode voltage and device over the ground |
| CN106487208B (en) * | 2016-11-28 | 2018-12-28 | 阳光电源股份有限公司 | The suppressing method and device of a kind of inverter ac cable common-mode voltage over the ground |
| EP3742595A1 (en) * | 2019-05-21 | 2020-11-25 | Schneider Electric IT Corporation | Surge protection circuit with integrated surveillance |
| US11011907B2 (en) | 2019-05-21 | 2021-05-18 | Schneider Electric It Corporation | Surge protection circuit with integrated surveillance |
| CN113381596A (en) * | 2020-03-09 | 2021-09-10 | 株洲中车奇宏散热技术有限公司 | Method for reducing overvoltage of wind power generator side filter |
| CN113945786A (en) * | 2021-10-11 | 2022-01-18 | 海检检测有限公司 | Automatic optimization device and optimization method for conducted disturbance parameters |
| CN113945786B (en) * | 2021-10-11 | 2024-06-04 | 海检检测有限公司 | Automatic conduction disturbance parameter optimizing device and optimizing method thereof |
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