CN107482943A - A kind of equalizer circuit of multi-level converter DC capacitor group - Google Patents
A kind of equalizer circuit of multi-level converter DC capacitor group Download PDFInfo
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- CN107482943A CN107482943A CN201710532777.6A CN201710532777A CN107482943A CN 107482943 A CN107482943 A CN 107482943A CN 201710532777 A CN201710532777 A CN 201710532777A CN 107482943 A CN107482943 A CN 107482943A
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- equalizer circuit
- current
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- capacitor group
- level converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of equalizer circuit of multi-level converter DC capacitor group, the exportable m level of multi-level converter, m >=3, its DC capacitor group is by 1 DC capacitor C of miIt is in series, i=1,2 ..., m 1,2 equalizer circuit units of m are configured, realize the balance of voltage of the multiple DC capacitors of multi-level converter.Any two adjacent capacitor of DC capacitor group is connected with an equalizer circuit unit.According to the sense of current of current-limiting inductance, when aiding in equalizing capacitance voltage to be more than its reference voltage, auxiliary equalizing capacitance is set to be discharged by current-limiting inductance to DC capacitor group；When aiding in equalizing capacitance voltage to be less than its reference voltage, DC capacitor group is set to be charged by current-limiting inductance to auxiliary equalizing capacitance, and then realize the voltage balancing control of DC capacitor group.Using the control algolithm for possessing overcurrent limitation capability proposed, the equalizer circuit under any modulation ratio and power factor, can ensure the balance of voltage of multi-level converter DC capacitor group.
Description
Technical field
The present invention relates to a kind of voltage balancing device of multi-level converter DC capacitor group, more particularly to a kind of diode
The voltage balancing device of the DC capacitor group of clamper type multi-level converter.
Background technology
The DC capacitor group of multi-level NPC inverter is made up of the DC capacitor of multiple series connection, the direct current
The both ends of appearance group are connected with dc source, and the points of common connection between electric capacity is suspension node, suspension node and multilevel
The clamp diode network of device is connected.The bridge arm of multi-level converter is by multiple device for power switching being connected in series and accordingly
Clamp diode network forms, and the control terminal of device for power switching is connected with the control device of multi-level converter.Pass through control
Device changes the on off state of the device for power switching of bridge arm, can obtain pressing through DC capacitor component in the output end of bridge arm and produce
Raw multiple level values.
Due to the intrinsic asymmetry of the interior capacitance outside of multi-level NPC inverter DC capacitor group so that
When transmitting active power between DC capacitor group and load, the voltage between DC capacitor can disequilibrium.This can cause work(
The voltage stress of rate switching device and clamp diode rises, output waveform Quality Down, threatens the more level of diode clamp bit-type
The safe operation of converter.Based on the method for equalizing voltage for improving modulation algorithm, multi-level NPC inverter tune can be reduced
System and the free degree of control, and can not ensure reliably to press under any modulation ratio and loading condition.Introduce appropriate pressure
Circuit, can be diode clamp on the premise of multi-level NPC inverter modulation and control freedom degree is kept
Type multi-level converter provides safe and reliable balance of voltage ability.
Document [1] (Akagi H, Fujita H, Yonetani S, et al.A6.6-kV transformerless
STATCOM based on a five-level diode-clamped PWM converter:System design and
experimentation of a 200-V 10-kVA laboratory model[J].IEEE Transactions on
Industry applications,2008,44(2):672-680.) propose a kind of how electric for five level diode clamp bit-types
The equalizer circuit of flat converter, realize the balance of voltage of DC capacitor group.The equalizer circuit is completely identical in structure equal by two
Volt circuit unit forms.Each equalizer circuit unit is based on H half-bridge, and two adjacent DC capacitors are realized by an energy storage inductor
Energy transmission between device, and then realize the balance of voltage of two adjacent direct current capacitors.The shortcomings that circuit is：(1) press
Device for power switching in circuit unit needs to be used in series, to bear high voltage；(2) voltage stress at energy storage inductor both ends
Greatly, it is therefore desirable to which larger energy storage inductor is set, to limit the rate of change of energy storage inductor electric current.
To reduce the voltage stress of the equalizer circuit cell power switching device of above-mentioned document [1], document [2] (Shukla
A,Ghosh A,Joshi A.Flying-capacitor-based chopper circuit for DC capacitor
voltage balancing in diode-clamped multilevel inverter[J].IEEE transactions
on industrial electronics,2010,57(7):2249-2261.) one is introduced in each equalizer circuit unit
Individual flying capacitor.But similar with document [1] described circuit, the circuit is still to be realized by energy storage inductor between DC capacitor
Energy transmission, its shortcoming are：(1) introducing of flying capacitor is mainly used in the voltage stress of equal power switching device；(2) direct current
The balance of voltage of electric capacity, it is still that energy is transmitted by the energy storage inductor in equalizer circuit unit to realize, the introducing of flying capacitor
Add the volume and weight of system；(3) after flying capacitor introduces, the voltage stress of the inductance element in equalizer circuit unit is still
For a quarter of DC bus-bar voltage, therefore still need and larger energy storage inductor is set, to limit energy storage inductor electric current
Rate of change.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming prior art, proposes a kind of pressure of multi-level converter DC capacitor group
Circuit.
The technical solution adopted by the present invention is：
A kind of equalizer circuit of multi-level converter DC capacitor group, the exportable m level of described multi-level converter,
m≥3.Its DC capacitor group is by m-1 DC capacitor CiIt is in series, i=1,2 ..., m-1.Configure m-2 equalizer circuit list
Member, realize the balance of voltage of the multiple DC capacitors of multi-level converter.Any two adjacent capacitor of DC capacitor group is with one
Individual equalizer circuit unit is connected.Control of the control terminal of the device for power switching of all equalizer circuit units with multi-level converter
Device processed is connected.Equalizer circuit proposed by the invention is particularly suitable for use in the straight of more level multi-level NPC inverters
Flow the balance of voltage of electric capacity.
The concrete composition of described equalizer circuit unit is：
Two power switching device series form one group of switch pair, form an internal points of common connection；Two groups of switches pair
A power switch networks in series, form an intermediate node；
The internal points of common connection of two of two groups of switches pair is respectively connecting to the auxiliary equalizing capacitance of equalizer circuit unit
Both ends；
The intermediate node of two groups of switches pair, pass through current-limiting inductance and the common node for two adjacent DC capacitors being balanced
It is connected；
Two not common tie points of the end of two groups of switches pair, respectively with the end for two adjacent DC capacitors being balanced
Two tie points in portion are connected.
The operation principle and control method of multi-level converter DC capacitor group equalizer circuit proposed by the present invention are as follows：
Using the voltage of the auxiliary equalizing capacitance of equalizer circuit unit as primary control targe, according to the auxiliary of equalizer circuit unit
The voltage of equalizing capacitance and the electric current of current-limiting inductance are helped, by the control device of the multi-level converter, determines each equal piezoelectricity
The on off state of the device for power switching of road unit so that when aiding in equalizing capacitance voltage to be more than its reference voltage, auxiliary is equal
Voltage capacitance is discharged by current-limiting inductance to DC capacitor group；When aiding in equalizing capacitance voltage to be less than its reference voltage, direct current
Appearance group is charged by current-limiting inductance to auxiliary equalizing capacitance, and then is realized DC capacitor group and aided in the balance of voltage of equalizing capacitance
Control.
Specifically, DC capacitor that equalizer circuit unit is connected, close to dc bus side of the positive electrode is defined to be referred to as
Electric capacity, it is referred to as lower electric capacity close to the DC capacitor of dc bus negative side, and according to power switch in each equalizer circuit unit
With dc bus positive pole distance from the close-by examples to those far off, by four device for power switching, referred to as first switch device, second open device successively
Device, the 3rd switching device and the 4th switching device are closed, then：
(1) when the electric current of current-limiting inductance flows into DC capacitor group：If the voltage of equalizing capacitance is aided in be more than it with reference to electricity
Pressure, then set by the control device of multi-level converter the power switch networks of equalizer circuit unit first switch device and
The shut-off of 3rd switching device, second switch device and the 4th switching device are open-minded so that auxiliary equalizing capacitance passes through current-limiting inductance
Downward electric capacity electric discharge；If the voltage of auxiliary equalizing capacitance is less than its reference voltage, pass through the control device of multi-level converter
Set equalizer circuit unit power switch networks first switch device and the 3rd switching device open, second switch device and
4th switching device is turned off so that upper electric capacity is charged by current-limiting inductance to auxiliary equalizing capacitance；
(2) when the electric current of current-limiting inductance flows out DC capacitor group：If the voltage of equalizing capacitance is aided in be more than it with reference to electricity
Pressure, then set by the control device of multi-level converter the power switch networks of equalizer circuit unit first switch device and
3rd switching device is opened, second switch device and the 4th switching device turn off so that auxiliary equalizing capacitance passes through current-limiting inductance
Upward electric capacity electric discharge；If the voltage of auxiliary equalizing capacitance is less than its reference voltage, pass through the control device of multi-level converter
Set equalizer circuit unit power switch networks first switch device and the 3rd switching device shut-off, second switch device and
4th switching device is open-minded so that lower electric capacity is charged by current-limiting inductance to auxiliary equalizing capacitance.
When the electric current of the current-limiting inductance detected exceedes safety value, by the control device of multi-level converter, close
All device for power switching of corresponding equalizer circuit unit, by the restriction of current of current-limiting inductance in safety value.
Compared with prior art, the beneficial effects of the invention are as follows：
First, the balance of voltage that proposed equalizer circuit realizes the DC capacitor group of multi-level converter, maximum journey are passed through
Degree remains the free degree of multi-level converter modulation and control；
2nd, the equalizer circuit provided can ensure that how electric diode clamp bit-type is under any modulation ratio and loading condition
The balance of voltage of flat converter DC capacitor group, extend the pressure operation area of multi-level NPC inverter；
3rd, equalizing capacitance is aided in substantially reduce the voltage stress of current-limiting inductance as main energy transmission device, because
This need not set big inductance to limit the rate of change of inductive current, be advantageous to the power density of raising system.
4th, limit DC capacitor using current-limiting inductance and aid in the discharge current between equalizing capacitance, compared to use
Current-limiting resistance, the power attenuation of equalizer circuit can be reduced, improve the efficiency of system.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams for the multi-level NPC inverter that the present invention is used for p phase m level；
Fig. 2 is the circuit theory diagrams that the present invention is used for the level multi-level NPC inverter of 3 phase 4；
Fig. 3 is 6 kinds of typical mode of operation of the 3rd equalizer circuit unit 31；
Wherein：The mode of operation 1 of the equalizer circuit units of Fig. 3 a the 3rd, the mode of operation 2 of the equalizer circuit units of Fig. 3 b the 3rd,
The mode of operation 3 of the equalizer circuit units of Fig. 3 c the 3rd, the mode of operation 4 of the equalizer circuit units of Fig. 3 d the 3rd, Fig. 3 e the 3rd are pressed
The mode of operation 5 of circuit unit, the mode of operation 6 of the equalizer circuit units of Fig. 3 f the 3rd.
Fig. 4 is the control method for the equalizer circuit unit for possessing current-limiting inductance overcurrent limitation capability；
In figure：11 first equalizer circuit units, 12 second equalizer circuit units, 21 diode clamp bit-type m level converters
Bridge 1 arm, 22 diode clamp bit-type m level converter Bridge 2 arms, 2p diode clamp bit-type m level converter pth bridge arms, 31
3rd equalizer circuit unit, 32 the 4th equalizer circuit units, the level converter Bridge 1 arm of 41 diode clamp bit-type 4,42 diodes
The level converter Bridge 2 arm of clamper type 4, the bridge arm of 43 diode clamp bit-type, 4 level converter the 3rd.
Embodiment
The equalizer circuit of multi-level converter DC capacitor group proposed by the present invention is used for p phase m level diode clamp bit-types
The circuit theory diagrams of multi-level converter are as shown in Figure 1.The direct current of the multi-level NPC inverter of p phase m level
Appearance group is by m-1 DC capacitor CiIt is composed in series, i=1,2 ..., m-1, configures m-2 group equalizer circuit units, realize more level
The balance of voltage of the multiple DC capacitors of converter.The adjacent DC capacitor of any two of DC capacitor group with an equal piezoelectricity
Road unit is connected.Control of the control terminal of each device for power switching of m-2 equalizer circuit unit with multi-level converter
Device is connected.
As shown in Fig. 2 a kind of embodiment of the present invention is：A kind of pressure of 4 level converter DC capacitor group
Circuit, the balance control for the DC capacitor voltage of the level multi-level NPC inverter of 3 phase 4.4 level diodes
The DC capacitor group of clamper type multi-level converter is by three DC capacitor C1, C2And C3It is composed in series, configures two equalizer circuits
Unit.Two adjacent electric capacity C1And C2It is connected to the 3rd equalizer circuit unit；Adjacent capacitor C2And C3It is connected to the 4th equal piezoelectricity
Road unit.Control device phase of the control terminal of each device for power switching of two equalizer circuit units with multi-level converter
Even.
The topological structure of 3rd equalizer circuit unit and the 4th equalizer circuit unit is identical with operation principle.Below with current limliting
Inductance LB1Exemplified by the 3rd equalizer circuit unit at place, the composition and operation principle of equalizer circuit unit are illustrated.
3rd equalizer circuit unit is by power switch networks, current-limiting inductance LB1With auxiliary equalizing capacitance CB1Composition.Wherein work(
Rate switching device SB11And SB12One group of switch pair in series, form an internal points of common connection B1N2；Device for power switching
SB13And SB14One group of switch pair in series, form an internal points of common connection B1N3.Two groups of switches are to a work(in series
Rate switching network, form an intermediate node B1M。
The internal points of common connection B of two of two groups of switches pair1N2And B1N3, it is respectively connecting to the auxiliary of the 3rd equalizer circuit unit
Help equalizing capacitance CB1Both ends.
The intermediate node B of two groups of switches pair1M, pass through current-limiting inductance LB1With two adjacent DC capacitor C being balanced1And C2
Common node N2It is connected.
Two not common tie point B of the end of two groups of switches pair1N1And B1N4, two adjacent direct currents with being balanced respectively
Electric capacity C1And C2End two tie point N1And N3It is connected.
Using the above-mentioned equalizer circuit of the present embodiment, to the direct current of the level multi-level NPC inverter of 3 phase 4
Hold voltage and be balanced control.The principle of 3rd equalizer circuit unit control method is, to aid in equalizing capacitance CB1Voltage be
Primary control targe, according to auxiliary equalizing capacitance CB1Voltage and current-limiting inductance LB1Electric current, pass through the described level two of 3 phase 4
The control device of pole pipe clamper type multi-level converter, determine the switch shape of device for power switching in the 3rd equalizer circuit unit
State so that as auxiliary equalizing capacitance CB1Voltage when being more than its reference voltage, aid in equalizing capacitance CB1Pass through current-limiting inductance LB1To
DC capacitor group is discharged；As auxiliary equalizing capacitance CB1Voltage when being less than its reference voltage, DC capacitor group passes through current-limiting inductance
LB1To auxiliary equalizing capacitance CB1Charging, and then realize DC capacitor group and auxiliary equalizing capacitance CB1The balance of voltage.
A kind of specific control method of the present embodiment is：
Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d, Fig. 3 e and Fig. 3 f show current-limiting inductance LB1The 3rd equalizer circuit unit at place
6 kinds of typical mode of operation, wherein device for power switching SB11And SB13On off state it is identical, SB12And SB14On off state phase
Together, it is open-minded during adjacent device for power switching difference.In mode of operation 1 and mode of operation 2, energy is in DC capacitor C1And auxiliary
Equalizing capacitance CB1Between flow；In mode of operation 3 and mode of operation 4, energy is in DC capacitor C2With auxiliary equalizing capacitance CB1It
Between flow；In mode of operation 5, energy is in DC capacitor C2With current-limiting inductance LB1Between flow；In mode of operation 6, energy is straight
Flow electric capacity C1With current-limiting inductance LB1Between flow.
In Fig. 3, for mode of operation 1 to mode of operation 4, current-limiting inductance LB1The voltage at both ends be corresponding DC capacitor with
Aid in equalizing capacitance CB1Difference in voltage, current-limiting inductance LB1Current changing rate it is smaller；In mode of operation 5 and mode of operation 6,
Current-limiting inductance LB1The voltage at both ends be corresponding DC capacitor voltage, current-limiting inductance LB1Current changing rate it is big.Therefore, according to
6 kinds of mode of operations shown in Fig. 3, devise and possess current-limiting inductance LB1The equalizer circuit control method of overcurrent limitation capability.
Fig. 4 show proposed by the invention possessing and limits current-limiting inductance overcurrent capability, current-limiting inductance LB1Place
The control method of 3rd equalizer circuit unit, to aid in equalizing capacitance CB1Voltage for primary control targe, according to sampling
The auxiliary equalizing capacitance C arrivedB1Voltage and current-limiting inductance LB1Electric current, it is more by the described level diode clamp bit-type of 3 phase 4
The control device of level converter, determine the device for power switching S of the 3rd equalizer circuit unitB11, SB12, SB13And SB14Switch
State so that the 3rd equalizer circuit unit switches in mode of operation 1 between mode of operation 6, and then finally realizes DC capacitor
C1, C2And C3And auxiliary equalizing capacitance CB1Voltage balancing control.
Specifically, the DC capacitor C of the close dc bus side of the positive electrode of the 3rd equalizer circuit unit connection is defined1To be upper
Electric capacity, close to the DC capacitor C of dc bus negative side2For lower electric capacity, and according to power switch in the 3rd equalizer circuit unit
Four device for power switching from the close-by examples to those far off, are referred to as first switch device S by device successively with dc bus positive pole distanceB11, second
Switching device SB12, the 3rd switching device SB13With the 4th switching device SB14.The control method include two working condition ST1 and
ST2, respectively normal operating conditions ST1 and current limliting working condition ST2.As current-limiting inductance LB1Electric current iLB1Within safety value
When, the 3rd equalizer circuit cell operation is in normal operating conditions ST1.
Normal operating conditions ST1 operation principle is：
(1) as current-limiting inductance LB1Electric current flow into DC capacitor group when：If aid in equalizing capacitance CB1Voltage more than its join
Voltage is examined, then sets the first of the power switch networks of the 3rd equalizer circuit unit to open by the control device of multi-level converter
Close device SB11With the 3rd switching device SB13Shut-off, second switch device SB12With the 4th switching device SB14It is open-minded so that auxiliary
Equalizing capacitance CB1Pass through current-limiting inductance LB1Downward electric capacity C2Electric discharge；If aid in equalizing capacitance CB1Voltage be less than its reference voltage,
The first switch device of the power switch networks of 3rd equalizer circuit unit is then set by the control device of multi-level converter
SB11With the 3rd switching device SB13Open, second switch device SB12With the 4th switching device SB14Shut-off so that upper electric capacity C1It is logical
Cross current-limiting inductance LB1To auxiliary equalizing capacitance CB1Charging；
(2) as current-limiting inductance LB1Electric current outflow DC capacitor group when：If aid in equalizing capacitance CB1Voltage more than its join
Voltage is examined, then sets the first of the power switch networks of the 3rd equalizer circuit unit to open by the control device of multi-level converter
Close device SB11With the 3rd switching device SB13Open, second switch device SB12With the 4th switching device SB14Shut-off so that auxiliary
Equalizing capacitance CB1Pass through current-limiting inductance LB1Upward electric capacity C1Electric discharge；If aid in equalizing capacitance CB1Voltage be less than its reference voltage,
The first switch device of the power switch networks of 3rd equalizer circuit unit is then set by the control device of multi-level converter
SB11With the 3rd switching device SB13Shut-off, second switch device SB12With the 4th switching device SB14It is open-minded so that lower electric capacity C2It is logical
Cross current-limiting inductance LB1To auxiliary equalizing capacitance CB1Charging.
When detecting current-limiting inductance LB1Electric current iLB1More than safety value iLTHWhen, by closing the 3rd equalizer circuit unit
All device for power switching SB11, SB12, SB13And SB14, make the 3rd equalizer circuit cell operation in current limliting working condition ST2, and then
By current-limiting inductance LB1Restriction of current in safety value.As current-limiting inductance LB1Electric current be reduced to 0 after, the 3rd equalizer circuit list
Member returns to normal operating conditions ST1 and worked on.Equalizer circuit control method shown in Fig. 4, ensure that equalizer circuit of the present invention
Safe operation.
Claims (4)
- A kind of 1. equalizer circuit of multi-level converter DC capacitor group, it is characterised in that：Described multi-level converter can be defeated Go out m level, m >=3, its DC capacitor group is by m-1 DC capacitor CiIt is in series, i=1,2 ..., m-1；Configure m-2 Equalizer circuit unit, realize the balance of voltage of the multiple DC capacitors of multi-level converter；Any two of DC capacitor group is adjacent Electric capacity is connected with an equalizer circuit unit；The control terminal of the device for power switching of all equalizer circuit units with more level The control device of converter is connected.
- 2. the equalizer circuit of multi-level converter DC capacitor group according to claim 1, it is characterised in that：Described is equal The concrete composition of volt circuit unit is：Two power switching device series form one group of switch pair, form an internal points of common connection；Two groups of switches are to series connection A power switch networks are formed, form an intermediate node；The internal points of common connection of two of two groups of switches pair, it is respectively connecting to the two of the auxiliary equalizing capacitance of equalizer circuit unit End；The intermediate node of two groups of switches pair, pass through current-limiting inductance and the common node phase for two adjacent DC capacitors being balanced Even；Two not common tie points of the end of two groups of switches pair, respectively with the end of two adjacent DC capacitors that is balanced Two tie points are connected.
- 3. the equalizer circuit of multi-level converter DC capacitor group according to claim 1 or 2, it is characterised in that：With institute The voltage of the auxiliary equalizing capacitance for the equalizer circuit unit stated is primary control targe；Pressed according to the auxiliary of equalizer circuit unit The voltage of electric capacity and the electric current of current-limiting inductance, by the control device of the multi-level converter, determine each equalizer circuit unit Device for power switching on off state so that when aid in equalizing capacitance voltage be more than its reference voltage when, auxiliary equalizing capacitance Discharged by current-limiting inductance to DC capacitor group；When aiding in equalizing capacitance voltage to be less than its reference voltage, DC capacitor group is led to Current-limiting inductance is crossed to auxiliary equalizing capacitance charging, and then realizes DC capacitor group and aids in the voltage balancing control of equalizing capacitance.
- 4. the equalizer circuit of multi-level converter DC capacitor group according to claim 3, it is characterised in that：When detecting The electric current of current-limiting inductance when exceeding safety value, by closing all device for power switching of corresponding equalizer circuit unit, will limit The restriction of current of inductance is flowed within safety value.
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| CN201710532777.6A CN107482943B (en) | 2017-07-03 | 2017-07-03 | A kind of equalizer circuit of multi-level converter DC capacitor group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113812079A (en) * | 2019-12-24 | 2021-12-17 | 华为数字能源技术有限公司 | Conversion circuit and related electronic device |
| CN114342236A (en) * | 2020-07-29 | 2022-04-12 | 华为数字能源技术有限公司 | Conversion circuit and related electronic device |
| CN115842537A (en) * | 2023-02-20 | 2023-03-24 | 杭州铂科电子有限公司 | Switch device series connection voltage-sharing circuit |
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| CN102255547A (en) * | 2011-07-17 | 2011-11-23 | 西南交通大学 | Voltage-sharing control circuit of diode-clamped multilevel converter DC (direct current) capacitor and voltage-sharing control method thereof |
| CN103236786A (en) * | 2013-04-17 | 2013-08-07 | 华为技术有限公司 | Voltage-sharing circuit and inverter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113812079A (en) * | 2019-12-24 | 2021-12-17 | 华为数字能源技术有限公司 | Conversion circuit and related electronic device |
| CN114342236A (en) * | 2020-07-29 | 2022-04-12 | 华为数字能源技术有限公司 | Conversion circuit and related electronic device |
| CN115842537A (en) * | 2023-02-20 | 2023-03-24 | 杭州铂科电子有限公司 | Switch device series connection voltage-sharing circuit |
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| CN107482943B (en) | 2019-07-30 |
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