CN109188177A - A kind of high-power NPC three-level inverter short circuit current on-line detecting system - Google Patents
A kind of high-power NPC three-level inverter short circuit current on-line detecting system Download PDFInfo
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- CN109188177A CN109188177A CN201811163568.XA CN201811163568A CN109188177A CN 109188177 A CN109188177 A CN 109188177A CN 201811163568 A CN201811163568 A CN 201811163568A CN 109188177 A CN109188177 A CN 109188177A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The present invention provides a kind of high-power NPC three-level inverter short circuit current on-line detecting system, comprising: di/dt detection unit, electric current reduction unit, short detection unit, short circuit paths recognition unit, current status display unit.The system only needs to judge short-circuit classification rapidly according to the positive and negative bus and load current and current change rate of every phase when short circuit occurs for inverter, identifies faulty line, helps to analyze short trouble reason.Compared with existing electric current online test method, the method reduce current detecting units, have better practical operability, stronger detection function and lower testing cost.
Description
Technical field
The present invention relates to power electronic devices detection field more particularly to a kind of high-power NPC three-level inverter short circuits
Electric current on-line detecting system.
Background technique
Neutral-point-clamped type (NPC) three-level inverter is the three-level topology structure being most widely used, and short trouble is
An important factor for influence system reliability service, when short trouble occurs for system, traditional control system is according to IGBT module
Driving plate detects short trouble, then carries out corresponding shutdown operation.However the short trouble issued according only to a certain module is
It is difficult the reason of quick diagnosis causes short trouble, especially in the case where secondary failure occurs for system, brought failure
Process effects hamper the correct judgement to short trouble factor.
Traditional method for detecting short circuit such as moves back saturation, di/dt detection method, and gate charge method etc. is intended only to realize
Quick short-circuit protection can not provide specific short circuit information.It at present can be short to detect by extracting the electric current of IGBT module
Road situation, however NPC type tri-level single phase topology shares 4 IGBT modules and 2 clamp diode modules, if simultaneously to each
Blocks current carries out independent detection, then needs 18 electric currents altogether for conventional Three-phase high-power NPC three-level topology structure
Detection unit undoubtedly increases the cost of system detection.
Summary of the invention
It is an object of that present invention to provide a kind of high-power NPC three-level inverter IGBT module electric current on-line detecting system,
Aim to solve the problem that the above problem.The present invention can either reduce current detecting unit, additionally it is possible to when short trouble occurs, accurate judgement
The current path of short trouble occurs.
To achieve the goals above, technical scheme is as follows: a kind of high-power NPC three-level inverter short circuit electricity
Flow on-line detecting system, comprising: di/dt detection unit, electric current reduction unit, short detection unit, short circuit paths recognition unit,
Current status display unit；The first output end of di/dt detection unit is connected with electric current reduction unit first input end, di/dt inspection
It surveys unit second output terminal to be connected with short detection unit first input end, the first output end of electric current reduction unit and short-circuit detecting
The second input terminal of unit is connected, and electric current reduction unit second output terminal is connected with current status display unit first input end, short
Detection unit the first output end in road is connected with short circuit paths recognition unit first input end, and short circuit paths recognition unit first exports
End is connected with the second input terminal of current status display unit；Wherein:
Di/dt detection unit flows through single-phase positive bus-bar current change rate di for detecting+/ dt, negative busbar current change rate
di-The current change rate di of/dt and loadL/dt；
Electric current reduction unit, the current change rate for detecting di/dt detection unit are reduced to surveyed current value；
Short detection unit, for detecting short-circuit condition, by measured current signal and current change rate signal and ginseng
It examines value to be compared, to judge whether to occur short trouble, and believe to the output of short circuit paths recognition unit output comparison result
Number；
Short circuit paths recognition unit, for judging short circuit paths, short circuit paths recognition unit has short circuit paths and exports compared with
The relation table of signal, can be by tabling look-up to obtain short circuit paths；
Current status display unit for showing that every phase exports positive and negative bus and load current, and shows short-circuit road in short circuit
Diameter.
As an improvement of the present invention, the di/dt detection unit uses flexible Luo-coil, is respectively fitted over A phase and opens up
At positive bus-bar, negative busbar and the load flutterred.
As an improvement of the present invention, the electric current reduction unit respectively detects di/dt using integrating circuit single
The positive and negative bus and load current change rate of member output carry out integral reduction.
As an improvement of the present invention, the integrating circuit is combined type integrating circuit.
As an improvement of the present invention, the comparison circuit is respectively to the forward current and reverse current difference at load
Short-circuit detecting is carried out, the forward current and its forward current rate of change to positive bus-bar and negative busbar carry out short-circuit detecting.
As an improvement of the present invention, in the short detection unit positive bus-bar and negative busbar current change rate ratio
Amplifier should be added compared with circuit front-end.
As an improvement of the present invention, short circuit paths are divided into two classes by the short circuit paths recognition unit, and one kind is bridge
Short circuit paths between arm, two classes are bridge arm internal short-circuit paths.Short circuit is that short circuit, short circuit current occur for inverter load between the bridge arm
Flow through load.The bridge arm internal short-circuit is the breakdown or the caused short circuit that misleads of power device in bridge arm, and short circuit current is not
Through overload.
As an improvement of the present invention, the current status display unit uses A/D chip by the defeated of electric current reduction unit
Signal VI outL, VI+And VI-It is converted into digital signal, and is stored in computer together with short circuit paths recognition unit output signal
In.
As an improvement of the present invention, it is the quantity for being further reduced current detecting unit, reduces detection system cost,
Only needing to measure any two-phase load current can show that the load current of another phase, the load current of another phase are other two phase loads
The negative of the sum of electric current.
As an improvement of the present invention, the electric current reduction unit is by two combined type integrating circuit and an adder
Composition.
Compared with existing method for detecting short circuit, the present invention is not necessarily to carry out current detecting to each module, it is only necessary to which detection is every
Electric current at the positive bus-bar of one phase, negative busbar and load, this not only reduces current detecting units, while it is single to decrease detection
The number of Rogowski coil in member.The present invention can not only identify short trouble, moreover it is possible to determine the path of short circuit current circulation, be work
Cheng personnel provide more detailed reference when short trouble reason occurs for diagnosis, help to improve the effect of short trouble diagnosis
Rate.
Detailed description of the invention
Below with reference to attached drawing, the invention will be further described:
Fig. 1 is short circuit current detection system；
Fig. 2 is NPC three-level inverter topology of the present invention and Rogowski coil riding position；
Fig. 3 short circuit current path between bridge arm；
Fig. 4 is bridge arm internal short-circuit current path；
Fig. 5 is combined type integrating circuit；
Fig. 6 A phase load current detection circuit；
The improved A phase load current detection circuit of Fig. 7；
Fig. 8 short circuit paths recognition rule table.
Specific embodiment:
In order to be more clearly understood that the content of present invention, with reference to the accompanying drawing and specific embodiment carries out in detail the present invention
Description.
Embodiment 1:
Referring to Fig. 1, a kind of high-power NPC three-level inverter short circuit current on-line detecting system, short circuit current inspection of the invention
Examining system includes: di/dt detection unit, electric current reduction unit, short detection unit, short circuit paths recognition unit, current status
Display unit.The first output end of di/dt detection unit is connected with electric current reduction unit first input end, di/dt detection unit
Two output ends are connected with short detection unit first input end, the first output end of electric current reduction unit and short detection unit second
Input terminal is connected, and electric current reduction unit second output terminal is connected with current status display unit first input end, short-circuit detecting list
First first output end is connected with short circuit paths recognition unit first input end, the first output end of short circuit paths recognition unit and electric current
The second input terminal of status display unit is connected；Wherein:
Di/dt detection unit flows through single-phase positive bus-bar current change rate di for detecting+/ dt, negative busbar current change rate
di-The current change rate di of/dt and loadL/dt；
Electric current reduction unit, the current change rate detected for di/dt detection unit are reduced to surveyed current value；
Short detection unit, for detecting short-circuit condition, by measured current signal and current change rate signal and ginseng
It examines value to be compared, to judge whether to occur short trouble, and believe to the output of short circuit paths recognition unit output comparison result
Number；
Short circuit paths recognition unit, for judging short circuit paths, the short circuit paths recognition unit have short circuit paths with than
It, can be by tabling look-up to obtain short circuit paths compared with the relation table of output signal；
Current status display unit for storing the positive and negative bus and load current of every phase output, and shows correspondence in short circuit
Short circuit paths.
Di/dt detection unit use flexible Luo-coil, flexible Luo-coil due to its shape be it is variable, be suitable for peace
Fill and measure the electric current of the biggish conductor of surface area.Rogowski coil is respectively fitted over to positive bus-bar, negative busbar and the load of A phase topology
Place, the riding position of Rogowski coil is referring to Fig. 2, QA1~QA3For A phase Rogowski coil riding position, QB1~QB3For B phase Rogowski coil peace
Put position, QC1~QC3Only it is to a facies analysis due to NPC three-level topology three-phase symmetrical for C phase Rogowski coil riding position
Can, it is analyzed by taking A phase topology as an example.
Electric current reduction unit, using three combined type integrating circuit positive and negative bus to Rogowski coil output and negative respectively
It carries current changing rate and carries out integral reduction.Combined type integrating circuit includes passive integrator and active integrating circuit, both can be with
Low-frequency current can also be restored by active integrating circuit by restoring high-frequency current by passive integrator, help to improve short circuit
Current measurement precision.As shown in the present embodiment Fig. 5, which includes discharge resistance RS, five resistance R1~ R5,
Two capacitor C1~C2, two operational amplifier U1~U2.Discharge resistance RSOne end and resistance R2One end connects and receives flexible Luo
Coil output signal, discharge resistance RSOther end ground connection；Resistance R2One end, capacitor C2One end and operational amplifier U1Positive input terminal
It is connected；Capacitor C2Other end ground connection；Resistance R1One end, capacitor C1One end, resistance R3One end and operational amplifier U1Negative input end phase
Even；Resistance R1Other end ground connection；Capacitor C1The other end, resistance R3The other end, operational amplifier U1Output end and amplifier U2It is just defeated
Enter end to be connected；Resistance R4One end, resistance R5One end and amplifier U2Negative input end is connected；Resistance R4Ground connection；Resistance R5The other end with
Amplifier U2Output end is connected and exports electric current recovering signal.
R2And C2Constitute passive integrator, U1、R1、R3And C1Constitute active integrating circuit.
Three combined type integrating circuit output recovering signal in electric current reduction unit is respectively positive bus-bar current signal
VIA+, negative busbar current signal VIA-With load current signal VILA。
Short detection unit schematic diagram as shown in fig. 6, the present embodiment using comparison circuit respectively to di/dt detection unit and
The output valve of electric current reduction unit is detected, by setting threshold parameter to determine whether generating short circuit.Using dual comparator
Load forward current and reverse current are compared respectively.Electric current and electric current when due to short circuit on positive bus-bar and negative busbar
Rate of change is positive direction, thus forward current and its positive current rate of change to positive pole line current and negative busbar is only needed to carry out
Short-circuit detecting.Since di/dt detection unit output valve is too small, thus the comparison circuit of positive bus-bar and negative busbar current change rate
Front end is added operational amplifier and is amplified to detected value.
Short detection unit includes: eight operational amplifier U3~U10, eight resistance R6~R13.Operational amplifier U3Negative input
End connection reference value VREF1, positive input terminal and operational amplifier U4Negative input end is connected and receives load current signal VILA, output
End output signal is VX1；Operational amplifier U4Positive input terminal connects reference value VREF2, output end output signal is VX2；Operation amplifier
Device U5Positive input terminal receives positive bus-bar current signal VIA+, negative input end connection reference value VREF3, output end output signal is VX3；
Operational amplifier U8Positive input terminal receives negative busbar current signal VIA-, negative input end connection reference value VREF5, output end output letter
Number be VX4；Resistance R8One end, resistance R9One end and operational amplifier U6Positive input terminal connection；Resistance R8The other end receives positive bus-bar
Current change rate signal diA+/ dt, resistance R9Other end ground connection；Resistance R6One end and resistance R7One end, operational amplifier U6It is negative
Input terminal is connected, resistance R6Other end ground connection；Resistance R7The other end and operational amplifier U6Output end, operational amplifier U7It is just defeated
Enter end to be connected, operational amplifier U6Output signal is VDIA+；Operational amplifier U7Negative input end connects reference value VREF4, output end
Output signal is VDI1；Resistance R12One end, resistance R13One end and operational amplifier U9Positive input terminal connection；Resistance R12Another termination
Receive positive bus-bar current change rate signal di-/dt, resistance R13Other end ground connection；Resistance R10One end and resistance R11One end, operation
Amplifier U9Negative input end is connected, resistance R10Other end ground connection；Resistance R11The other end and operational amplifier U9Output end, operation are put
Big device U10Positive input terminal is connected, operational amplifier U9Output signal is VDIA-；Operational amplifier U10Negative input end connects reference value
VREF6, output end output signal is VDI2。
VX1To indicate to occur positive short circuit current, V at load when high level 1X2To indicate to occur at load when high level 1
Reversed short circuit current, VX3To indicate that short circuit current, V occurs in positive bus-bar when high level 1X4To indicate to go out at negative busbar when high level 1
Existing short circuit current, VDI1To indicate that positive bus-bar short circuit current rate of change is higher when high level 1, VDI2To indicate negative when high level 1
Busbar short-circuit current change rate is higher.
Short circuit paths recognition unit uses FPGA or CPLD digit chip, and logical program is arranged in the chips and carries out path knowledge
Not.Short circuit paths are divided into two classes by its present invention, and one kind is short circuit paths between bridge arm, is set as 1 ~ path of path 4, as shown in Figure 3；
Two classes are bridge arm internal short-circuit paths, are set as 5 ~ path of path 9, as shown in Figure 4.
Between bridge arm in short circuit paths, the first IGBT module of A phase T is flowed through from positive bus-bar for short circuit current in path 11, second
IGBT module T2With load LA；The first clamp diode module D is flowed through from zero bus for electric current in path 21, the second IGBT module T2
With load LA；Path 3 be electric current from load LAFlow through third IGBT module T3, the second clamp diode module D2Reach zero bus；
Path 4 be electric current from load LAFlow through third IGBT module T3, the 4th IGBT module T4Reach negative busbar.
In bridge arm internal short-circuit path, the first IGBT module T is flowed through from positive bus-bar for electric current in path 51, the second IGBT module
T2, third IGBT module T3With the second clamp diode D2.The first IGBT module T is flowed through from positive bus-bar for electric current in path 61With
One clamp diode D1.The first clamp diode D is flowed through from zero bus for electric current in path 71, the second IGBT module T2, the 3rd IGBT
Module T3With the 4th IGBT module T4.The second clamp diode D is flowed through from zero bus for electric current in path 82With the 4th IGBT module
T4.The first IGBT module T is flowed through from positive bus-bar for electric current in path 91, the second IGBT module T2, third IGBT module T3With the 4th
IGBT module T4。
Short circuit paths recognition principle are as follows: due to short circuit current will certainly be by one in positive bus-bar, negative busbar and load at
Or at two, and short circuit current rate of change can be different due to flowing through the difference of power device quantity, thus pass through detection short circuit electricity
It flows and whether passes through positive bus-bar, at negative busbar and load, while detecting the size of positive bus-bar and negative busbar short circuit current rate of change
To judge short circuit paths.
Positive short circuit current, i.e. VI are detected simultaneously by positive bus-bar and loadA+>VREF3、VILA>VREF1When, short circuit current
Flow through path 1；Positive short circuit current, i.e. VI are detected at only loadLA>VREF1Constantly, short circuit current flows through path 2；When only
Reversed short circuit current, i.e. VI are detected at loadLA<VREF2When, short circuit current flows through path 3；Forward direction is detected at negative busbar
Reversed short circuit current, VI are detected at short circuit current and loadA->VREF5、VILA<VREF2When, short circuit current flows through path 4.When only
Positive short circuit current, i.e. VI are detected at positive bus-barA+>VREF3When, and short circuit current change rate is smaller, i.e. VDIA+<VREF4When, it is short
Road electric current flows through path 5, and when short circuit current change rate is larger, i.e. VDIA+>VREF4When, short circuit current flows through path 6；When only bearing
Positive short circuit current, i.e. VI are detected at busA->VREF5When, and short circuit current change rate is smaller, i.e. VDIA-<VREF6When, short circuit
Electric current flows through path 7, and when short circuit current change rate is larger, i.e. VDIA->VREF6When, short circuit current flows through path 8；As I+ and I-
It is detected simultaneously by short circuit current, i.e. VIA+>VREF3And VIA->VREF5When, short circuit current flows through path 9.
Path Recognition rule list shown in Fig. 8, the output of short circuit paths recognition unit are formulated according to short circuit paths recognition principle
Value is 4 binary signals.Work as VX1-VX4, VDI1, VDI2It is normal condition for low level 0, corresponding output signal is 0000；
Work as VX1And VX3It is short circuit paths 1 when being simultaneously high level 1, corresponding output signal is 0001；As only VX1When for high level 1,
For short circuit paths 2, corresponding output signal is 0010；Work as VX2And VX4It is short circuit paths 3 when being simultaneously high level 1, it is corresponding
Output signal is 0011；As only VX2It is short circuit paths 4 when for high level 1, corresponding output signal is 0100；As only VX3For height
It is short circuit paths 5 when level 1, corresponding output signal is 0101；Work as VX3And VDI1When being in succession high level 1 in the short time, it is
Short circuit paths 6, corresponding output signal are 0110；As only VX4It is short circuit paths 7 when for high level 1, corresponding output signal is
0111；Work as VX4And VDI2It is short circuit paths 8 when being in succession high level 1 in the short time, corresponding output signal is 1000；Work as VX3
And VX4It is short circuit paths 9 when being simultaneously high level 1, corresponding output signal is 1001.
Current status display unit uses A/D chip by the output signal VI of electric current reduction unitL, VI+And VI-It is converted into number
Word signal stores in a computer together with 4 binary signals of short circuit paths recognition unit output, passes through oscilloscope display
The waveform of every phase positive bus-bar, negative busbar and load current.When short trouble occurs, short circuit current path will be with the shape of charactron
Formula shows its corresponding path；Engineering staff can be according to the electric current road for the data waveform and numeral method that calculator memory stores up
The reason of diameter judgement causes short trouble.
Embodiment 2:
Since the sum of threephase load electric current is zero, for the quantity for being further reduced current detecting unit, detection system cost is reduced,
It only needs to measure any two-phase load current, the load current of another phase is the negative of the sum of other two-phase load currents.It thus can
Remove Q in Fig. 1A3、QB3、QC3The Rogowski coil and its combined type integrating circuit of any position, to remove QA3The Rogowski coil at place is
A phase current reduction unit is detected load current I by exampleLACombined type integrating circuit instead of circuit as shown in Figure 7.
The circuit is an adder, input signal phase adduction directly can be taken negative.Adder includes: three resistance R14~
R16, an operational amplifier U11；Wherein resistance R14One end receive B phase load current signal VILB, resistance R15One end receive
C phase load current signal VILC, operational amplifier U11Negative input end and resistance R14The other end, resistance R15The other end, resistance R16
One end is connected, operational amplifier U11Positive input terminal ground connection, operational amplifier U11Output end and resistance R16The other end is connected,
Output signal VILA。
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no for the purpose of limiting the invention
Protection scope, the equivalent substitution or substitution made based on the above technical solution all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of high-power NPC three-level inverter short circuit current on-line detecting system, the detection system includes: di/dt inspection
Survey unit, electric current reduction unit, short detection unit, short circuit paths recognition unit and current status display unit；Its feature
It is, the first output end of di/dt detection unit is connected with electric current reduction unit first input end, and di/dt detection unit second is defeated
Outlet is connected with short detection unit first input end, and the first output end of electric current reduction unit and short detection unit second input
End is connected, and electric current reduction unit second output terminal is connected with current status display unit first input end, short detection unit the
One output end is connected with short circuit paths recognition unit first input end, the first output end of short circuit paths recognition unit and current status
The second input terminal of display unit is connected；Wherein:
The di/dt detection unit flows through single-phase positive bus-bar current change rate di for detecting+/ dt, negative busbar curent change
Rate di-The current change rate di of/dt and loadL/dt；
The electric current reduction unit, the current change rate for detecting di/dt detection unit are reduced to surveyed electric current
Value；
The short detection unit, for detecting short-circuit condition, by measured current signal and current change rate signal
It is compared with reference value, to judge whether to occur short trouble, and exports the defeated of comparison result to short circuit paths recognition unit
Signal out；
The short circuit paths recognition unit, for judging short circuit paths, the short circuit paths recognition unit has short circuit paths
The relation table of output signal compared with, can be by tabling look-up to obtain short circuit paths；
The current status display unit, for storing and showing that every phase exports positive and negative bus and load current, and in short circuit
Show short circuit paths.
2. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 1, feature
It is, the di/dt detection unit uses flexible Luo-coil, is respectively fitted over positive bus-bar, negative busbar and the load of A phase topology
Place.
3. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 1, feature
It is, the electric current reduction unit is electric to the positive and negative bus and load of the output of di/dt detection unit respectively using integrating circuit
Rheology rate carries out integral reduction.
4. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 3, feature
It is, the integrating circuit is combined type integrating circuit.
5. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 1, feature
It is, the short detection unit is using comparison circuit respectively to the output valve of di/dt detection unit and electric current reduction unit
It is detected, is compared by the threshold parameter with setting to determine whether generating short circuit.
6. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 5, feature
Be, the comparison circuit respectively at load forward current and reverse current carry out short-circuit detecting respectively, to positive bus-bar and
The forward current and its forward current rate of change of negative busbar carry out short-circuit detecting.
7. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 6, feature
It is, the comparison circuit front end of positive bus-bar and negative busbar current change rate should add amplifier in the short detection unit.
8. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 1, feature
It is, the current status display unit uses A/D chip by the output signal VI of electric current reduction unitL, VI+And VI-It is converted into
Digital signal, and stored together in a computer with short circuit paths recognition unit output signal.
9. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 1, feature
It is, the detection system, which only needs to measure any two-phase load current, can obtain the load current of another phase, the load of another phase
Electric current is the negative of the sum of other two-phase load currents.
10. a kind of high-power NPC three-level inverter short circuit current on-line detecting system according to claim 9, special
Sign is that the electric current reduction unit is made of two combined type integrating circuit and an adder.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138354A (en) * | 2021-04-15 | 2021-07-20 | 广东友电新能源科技有限公司 | Self-checking method and system of I-type three-level inverter |
| CN114222926A (en) * | 2019-10-04 | 2022-03-22 | 新电元工业株式会社 | Current detection device, motor control device, and current detection method |
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