CN108471255A - A kind of arbitrary polarity high-voltage square-wave superimposed pulses device - Google Patents
A kind of arbitrary polarity high-voltage square-wave superimposed pulses device Download PDFInfo
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- CN108471255A CN108471255A CN201810257186.7A CN201810257186A CN108471255A CN 108471255 A CN108471255 A CN 108471255A CN 201810257186 A CN201810257186 A CN 201810257186A CN 108471255 A CN108471255 A CN 108471255A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention discloses a kind of arbitrary polarity high-voltage square-wave superimposed pulses device, arbitrary polarity square wave pulse that the negative pulse of positive pulse and any number for exporting any number is optionally combined, which is characterized in that including：Power frequency AC；Resonant power is electrically connected with power frequency AC；Multiple high frequency transformers, the voltage for exporting resonant power are boosted and are isolated, and there is primary and secondary side, primary side to be electrically connected with resonant power；Rectification circuit is connect with the secondary side of high frequency transformer, for high-frequency ac to be rectified into direct current, is charged to subsequent capacitance；Pulse generating circuit is connect with rectification circuit, is used for output cathode pulse and negative pulse；Drive control module is connect with pulse generating circuit, for changing the operating mode of pulse generating circuit；And main control chip FPGA, it is connect connection with drive control module and resonant power, the control signal for providing drive control module and the working frequency for adjusting resonant power.
Description
Technical field
The invention belongs to technical field of pulse power, and in particular to a kind of arbitrary polarity high-voltage square-wave superimposed pulses device.
Background technology
Currently, complete solid state pulse generator has many advantages, such as that compact-sized, efficient, control is simple in numerous pulse generations
Show one's talent in device.Studies have shown that impulse electric field strength, rising edge of a pulse, pulse polarity correspondence treatment effect have emphatically
It influences.Domestic and foreign scholars have carried out various researchs to the production method of high-voltage pulse, but there are polarity non-adjustable, charge and discharge
The one or more of which problems such as electrical circuit is not isolated, is complicated, is of high cost, hangover is serious, so needing one kind that can solve
The certainly superimposed pulses device of the above problem.
Invention content
The present invention is to carry out to solve the above-mentioned problems, and it is an object of the present invention to provide a kind of arbitrary polarity high-voltage square-wave pulse
Superimposer.
The present invention provides a kind of arbitrary polarity high-voltage square-wave superimposed pulses device, the positive polarity arteries and veins for exporting any number
The arbitrary polarity square wave pulse that the negative pulse of punching and any number is optionally combined, has the feature that, including：Power frequency is handed over
Galvanic electricity source；Resonant power is electrically connected with power frequency AC；Multiple high frequency transformers, the electricity for exporting resonant power
Pressure is boosted and is isolated, which has the primary side being in series and the identical secondary side of the number of turns, primary side and resonant power
It is electrically connected；Rectification circuit is connect with the secondary side of high frequency transformer, for high-frequency ac to be rectified into direct current, gives subsequent capacitance
Charging；Pulse generating circuit is connect with rectification circuit, is used for output cathode pulse and negative pulse；Drive control module,
It is connect with pulse generating circuit, for changing the operating mode of pulse generating circuit；And main control chip FPGA, with drive control
Module and resonant power connection connect, the control signal for providing drive control module and the work frequency for adjusting resonant power
Rate, wherein pulse generating circuit includes at least storage capacitor C1, storage capacitor C2, storage capacitor C3, semiconductor controllable switch Qa1、
Semiconductor controllable switch Qb1, semiconductor controllable switch Qc1, semiconductor controllable switch Qd1, diode Db1, diode Dc1, energy storage electricity
Hold C2With semiconductor controllable switch Qa1, semiconductor controllable switch Qb1, semiconductor controllable switch Qc1And semiconductor controllable switch Qd1
Form full-bridge circuit, capacitance C1It is connect with the both ends of the upper bridge arm of full-bridge circuit, capacitance C3With the both ends of the lower bridge arm of full-bridge circuit
Connection, diode Db1With diode Dc1Respectively with semiconductor controllable switch Qb1With semiconductor controllable switch Qc1Reverse parallel connection.
In arbitrary polarity high-voltage square-wave superimposed pulses device provided by the invention, it can also have the feature that：Wherein,
Resonant power is high-frequency resonant power supply.
In arbitrary polarity high-voltage square-wave superimposed pulses device provided by the invention, it can also have the feature that：Wherein,
High frequency transformer is manganese-zinc ferrite magnetic ring transformer, which is step-up transformer.
In arbitrary polarity high-voltage square-wave superimposed pulses device provided by the invention, it can also have the feature that：Wherein,
The synchronization isolation method that the type of drive that drive control module uses is isolated for magnetic core.
In arbitrary polarity high-voltage square-wave superimposed pulses device provided by the invention, it can also have the feature that：Wherein,
The number of full-bridge circuit is n, n >=1, and the number of storage capacitor is 2n+1, and the number of semiconductor controllable switch is a for 4n, two
The number of pole pipe is 2n.
The effect of invention
A kind of arbitrary polarity high-voltage square-wave superimposed pulses device of the present invention exports any amount by controlling drive signal
The pulse of positive polarity high-voltage square-wave and any number of negative polarity high-voltage square-wave pulse combined arbitrary polar cycle pulse；It reduces
The usage quantity of semiconductor controllable switch without increasing other tail cut switch just has the function of truncation, efficiently solves and drag
Tail serious problems, so can work under capacitive load, it is simple in structure, greatly reduce cost.The present invention and traditional full-bridge
Structure superimposed pulses device ratio does not change semiconductor switch usage quantity in the case where storage capacitor charging voltage is equal, due to
Storage capacitor number increases one times, and clock output amplitude can double.The present invention and traditional full bridge structure pulse
Superimposer ratio, under the equal requirement of output amplitude, the primary side input voltage size of each Magnetic isolation transformer can reduce one
Half, so when designing Magnetic isolation transformer, when considering magnetic saturation problem, the volume of magnetic core can reduce one times.In addition, this
Switch driving section has been all made of the mode of magnetic core isolation in the storage capacitor charging of invention and pulse generating circuit, effectively real
The electrical isolation of strong and weak electricity is showed, pulse power work is more reliable and more stable.Therefore, a kind of arbitrary polarity high pressure side of the invention
There is wave impulse superimposer compact-sized, the arbitrary adjustable, pulsewidth of output pulse polarity and frequency to be continuously adjusted, be applicable in different characteristics
The advantages that loading, be safe and reliable, convenient for applying.
Description of the drawings
Fig. 1 is the structure diagram in the embodiment of the present invention；
Fig. 2 is the schematic diagram of the pulse generating circuit in the embodiment of the present invention；
Fig. 3 is the schematic diagram of the arbitrary polarity high-voltage square-wave superimposed pulses device in the embodiment of the present invention；
Fig. 4 is the schematic diagram that the positive square-wave pulse in the embodiment of the present invention generates；
Fig. 5 is the schematic diagram that the losing side wave impulse in the embodiment of the present invention generates；
Fig. 6 is the concatenated string heart magnet ring driving schematic diagram of multiple magnetic cores in the embodiment of the present invention；
Fig. 7 is the control signal that positive pulse twice, negative pulse are generated in a cycle in the embodiment of the present invention
And output waveform figure.
Specific implementation mode
In order to which the technological means for making the present invention realize is easy to understand with effect, with reference to embodiments and attached drawing is to this
Invention is specifically addressed.
Embodiment：
Fig. 1 is the structure diagram in the embodiment of the present invention.
As shown in Figure 1, a kind of arbitrary polarity high-voltage square-wave superimposed pulses device 100 of the present embodiment, for exporting arbitrary
The arbitrary polarity square wave pulse that the negative pulse of several positive pulses and any number is optionally combined, including：Industrial frequency AC
Power supply 1, resonant power 2, high frequency transformer 3, rectification circuit 4, pulse generating circuit 7, drive control module 6 and main control chip
FPGA5。
Resonant power 2 is electrically connected with the power frequency AC 1.
Resonant power 2 is high-frequency resonant power supply.
Multiple high frequency transformers 3, the voltage for exporting the resonant power 2 are boosted and are isolated, which becomes
There is depressor the primary side being in series and the identical secondary side of the number of turns, the primary side to be electrically connected with the resonant power 2.
High frequency transformer 3 is manganese-zinc ferrite magnetic ring transformer, which is step-up transformer.
Rectification circuit 4 connect with the secondary side of the high frequency transformer 3, for high-frequency ac to be rectified into direct current, gives
Subsequent capacitance charges.
Fig. 2 is the schematic diagram of the pulse generating circuit in the embodiment of the present invention.
As shown in Fig. 2, pulse generating circuit 7, connect with the rectification circuit 4, it to be used for output cathode pulse and cathode
Property pulse.
Include storage capacitor C in pulse generating circuit 7110, storage capacitor C2, storage capacitor C3, storage capacitor C4, energy storage
Capacitance C5, semiconductor controllable switch Qb1, semiconductor controllable switch Qa111, semiconductor controllable switch Qc1, semiconductor controllable switch
Qd1, semiconductor controllable switch Qb2, semiconductor controllable switch Qa2, semiconductor controllable switch Qc2, semiconductor controllable switch Qd2, two poles
Pipe Db1, diode Dc1, diode Db213, diode Dc2, the storage capacitor C2, semiconductor controllable switch Qb1, semiconductor it is controllable
Switch Qa111, semiconductor controllable switch Qc1, semiconductor controllable switch Qd1Form full-bridge circuit A, storage capacitor C4, semiconductor can
Control switch Qb2, semiconductor controllable switch Qa2, semiconductor controllable switch Qc2, semiconductor controllable switch Qd2Form full-bridge circuit B.Institute
State storage capacitor C1It is connect with the upper bridge arm both ends of the full-bridge circuit A, under the storage capacitor C3 and full-bridge circuit A
Bridge arm both ends connect, the storage capacitor C3It is also connect with the upper bridge arm both ends of the full-bridge circuit B, the storage capacitor C5With
The lower bridge arm both ends of the full-bridge circuit B connect, the diode Db1、Dc1Respectively with the semiconductor controllable switch Qb1, partly lead
Body controllable switch Qc1Reverse parallel connection.
Semiconductor controllable switch can be MOSFET, can also be IGBT or other controllable semiconductor controllable switches.
Load 12 in Fig. 2 can be resistive load, can also be capacitive load or capacitance resistance load.
Storage capacitor ensures the charged polarity of voltage on per two adjacent storage capacitors on the contrary, polarity is by front end
The electric current outbound course decision of rectification circuit, the storage capacitor C1Polarity is that the right side is being born just in a left side, the storage capacitor C2Polarity is a left side
It is positive right negative, the storage capacitor C3Polarity is that the right side is being born just in a left side, the storage capacitor C4Polarity is left positive right negative, the storage capacitor
C5Polarity is that the right side is being born just in a left side.
Drive control module 6 is connect with the pulse generating circuit 7, for changing the work of the pulse generating circuit 7
Pattern.
The synchronization isolation method that the type of drive that drive control module 6 uses is isolated for magnetic core, the synchronization isolation method are：
The primary side of multiple magnetic cores is connected, and ensures the synchronism of signal.
Main control chip FPGA5 connect connection with the drive control module 6 and the resonant power 2, described for providing
The control signal of drive control module 6 and the working frequency for adjusting the resonant power 2.
Fig. 3 is the schematic diagram of the arbitrary polarity high-voltage square-wave superimposed pulses device in the embodiment of the present invention, and Fig. 6 is the present invention
Embodiment in the concatenated string heart magnet ring of multiple magnetic cores drive schematic diagram.
As shown in Figure 3 and Figure 6, the working frequency that resonant power 2 is adjusted by main control chip FPGA5, makes power work exist
Resonant condition, the primary side of resonant power 2 exported as multiple high frequency transformers 3 are secondary after the boosting of high frequency transformer 3, isolation
While being connected to the input terminal of rectification circuit 4, storage capacitor C is given after rectification1Charging.Meanwhile main control chip FPGA5 generates multi-channel time-delay
Signal obtains the synchronized signal after high frequency transformer 3 is isolated, the synchronous driving letter of gained after drive control module 6
Number control semiconductor controllable switch Qa111 break-makes, the semiconductor controllable switch Q be then connecteda111 by each adjacent two voltage pole
Property opposite storage capacitor discharged in series in different directions, control strategy is changed by main control chip FPGA, cooperation is owned
Truncation function, realize arbitrary polar high-voltage square-wave pulse output.
The specific process for generating positive-negative polarity square-wave pulse is as follows：
Fig. 4 is the schematic diagram that the positive square-wave pulse in the embodiment of the present invention generates.
Positive pulse is discharged：Shown in the circuit of solid black lines mark as shown in Figure 4, semiconductor controllable switch Qa111, it partly leads
Body controllable switch Qa2With semiconductor controllable switch Qc1, semiconductor controllable switch Qc2It simultaneously turns on, semiconductor controllable switch Qb1, half
Conductor controllable switch Qb2With semiconductor controllable switch Qd1, semiconductor controllable switch Qd2It is in off state, so storage capacitor
C1, storage capacitor C2, storage capacitor C3, storage capacitor C4, storage capacitor C5With the semiconductor controllable switch Q of conductinga111, it partly leads
Body controllable switch Qa2With semiconductor controllable switch Qc1, semiconductor controllable switch Qc2Series connection is formed to load discharge, power supply starts defeated
Go out positive pulse, obtains faster rising edge.Assuming that voltage is U on storage capacitorC, then load voltage UO=-4UC。
Positive pulse truncation：Since there are stray capacitance and stray inductance, voltage will not drop to zero immediately in load in circuit,
But start slowly to decline, the failing edge of guiding discharge pulse is greatly increased, especially under capacitive load, is powered on by capacitive load
Press the influence kept, trailing phenomenon more serious.Therefore need offer one fast to stray capacitance and load capacitance after discharge
The channel of speed electric discharge, to obtain the waveform for possessing rapid decrease edge in load.Such as the circuit institute that black dotted lines mark in Fig. 4
Show, semiconductor controllable switch Qb1, semiconductor controllable switch Qb2It simultaneously turns on, the charge in load will controllably be opened by semiconductor
Close Qb1, semiconductor controllable switch Qb2And with semiconductor controllable switch Qc1, semiconductor controllable switch Qc2The diode of reverse parallel connection
Dc1, diode Dc2The circuit of composition discharges rapidly, to obtain faster failing edge.
Fig. 5 is the schematic diagram that the losing side wave impulse in the embodiment of the present invention generates.
Negative pulse discharge：Shown in the circuit of solid black lines mark as shown in Figure 5, semiconductor controllable switch Qb1, semiconductor
Controllable switch Qb2With semiconductor controllable switch Qd1, semiconductor controllable switch Qd2It simultaneously turns on, semiconductor controllable switch Qa111, half
Conductor controllable switch Qa2With semiconductor controllable switch Qc1, semiconductor controllable switch Qc2It is in off state, so storage capacitor
C1, storage capacitor C2, storage capacitor C3, storage capacitor C4, storage capacitor C5With the semiconductor controllable switch Q of conductingb1, semiconductor
Controllable switch Qb2With semiconductor controllable switch Qd1, semiconductor controllable switch Qd2One and positive pulse is formed to discharge opposite series connection
To load discharge, power supply starts to export negative pulse, obtains faster rising edge in circuit.Assuming that voltage is U on storage capacitorC, bear
Carry voltage UO=-4UC。
Negative pulse truncation：Shown in the circuit of black dotted lines mark as shown in Figure 5, semiconductor controllable switch Qc1, semiconductor
Controllable switch Qc2It is connected, the charge in load will pass through semiconductor controllable switch Qc1, semiconductor controllable switch Qc2And with partly lead
Body controllable switch Qb1, semiconductor controllable switch Qb2The diode D of reverse parallel connectionb1, diode Db2Composition circuit discharges rapidly, from
And obtain faster failing edge.
Fig. 7 is the control signal that positive pulse twice, negative pulse are generated in a cycle in the embodiment of the present invention
And output waveform figure.
As long as changing the conducting off state of semiconductor controllable switch, the pulse output of arbitrary combinations of polarities is can be achieved with,
It is given in the present embodiment in one cycle, generates the control strategy of positive pulse and a negative pulse twice.As shown in fig. 7,
UgsIndicate semiconductor controllable switch driving voltage, UoIndicate the upper waveform of load.t1Moment semiconductor controllable switch Qa111, semiconductor
Controllable switch Qa2With semiconductor controllable switch Qc1, semiconductor controllable switch Qc2It simultaneously turns on, starts to obtain positive pulse in load,
t2Moment semiconductor controllable switch Qa111, semiconductor controllable switch Qa2With semiconductor controllable switch Qc1, semiconductor controllable switch Qc2
It simultaneously turns off, t3Moment semiconductor controllable switch Qb1, semiconductor controllable switch Qb2Truncation is simultaneously turned on, is obtained for the first time in load
Positive square-wave pulse；t4Moment semiconductor controllable switch Qa111, semiconductor controllable switch Qa2With semiconductor controllable switch Qc1, partly lead
Body controllable switch Qc2It simultaneously turns on, obtains positive pulse, t in load again5Moment semiconductor controllable switch Qa111, semiconductor is controllable
Switch Qa2With semiconductor controllable switch Qc1, semiconductor controllable switch Qc2It simultaneously turns off, t6Moment semiconductor controllable switch Qb1, half
Conductor controllable switch Qb2Truncation is simultaneously turned on, positive square-wave pulse is obtained for the second time in load；t7Moment semiconductor controllable switch Qb1、
Semiconductor controllable switch Qb2With semiconductor controllable switch Qd1, semiconductor controllable switch Qd2It simultaneously turns on, starts to be born in load
Pulse, t8Moment semiconductor controllable switch Qb1, semiconductor controllable switch Qb2With semiconductor controllable switch Qd1, semiconductor controllably opens
Close Qd2It simultaneously turns off, t9Moment semiconductor controllable switch Qc1, semiconductor controllable switch Qc2Truncation is simultaneously turned on, is obtained in load
Losing side wave impulse.
The effect of embodiment
A kind of arbitrary polarity high-voltage square-wave superimposed pulses device of the present embodiment exports arbitrary number by controlling drive signal
The arbitrary polar cycle pulse of the positive polarity high-voltage square-wave pulse of amount and any number of negative polarity high-voltage square-wave pulse combined；Subtract
The usage quantity for having lacked semiconductor controllable switch just has the function of truncation, efficiently solves without increasing other tail cut switch
Hangover serious problems, so can work under capacitive load, it is simple in structure, greatly reduce cost.The present embodiment with it is traditional
Full bridge structure superimposed pulses device ratio does not change semiconductor switch usage quantity in the case where storage capacitor charging voltage is equal,
Since storage capacitor number increases one times, clock output amplitude can double.The present embodiment and traditional full-bridge knot
Structure superimposed pulses device ratio, under the equal requirement of output amplitude, the primary side input voltage size of each Magnetic isolation transformer can be with
Reduce half, so when designing Magnetic isolation transformer, when considering magnetic saturation problem, the volume of magnetic core can reduce one times.
In addition, switch driving section has been all made of the side of magnetic core isolation in the storage capacitor charging of the present embodiment and pulse generating circuit
Formula, has effectively achieved the electrical isolation of strong and weak electricity, and pulse power work is more reliable and more stable.Therefore, one kind of the present embodiment
Arbitrary polarity high-voltage square-wave superimposed pulses utensil has compact-sized, the arbitrary adjustable, pulsewidth of output pulse polarity and frequency continuously may be used
It adjusts, is applicable in different characteristics load, is safe and reliable, being convenient for the advantages that application.
The above embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (5)
1. a kind of arbitrary polarity high-voltage square-wave superimposed pulses device, positive pulse and any number for exporting any number
The arbitrary polarity square wave pulse that negative pulse is optionally combined, which is characterized in that including：
Power frequency AC；
Resonant power is electrically connected with the power frequency AC；
Multiple high frequency transformers, the voltage for exporting the resonant power are boosted and are isolated, high frequency transformer tool
There are the primary side being in series and the identical secondary side of the number of turns, the primary side to be electrically connected with the resonant power；
Rectification circuit is connect with the secondary side of the high frequency transformer, for high-frequency ac to be rectified into direct current, to follow-up electricity
Capacity charge；
Pulse generating circuit is connect with the rectification circuit, is used for output cathode pulse and negative pulse；
Drive control module is connect with the pulse generating circuit, for changing the operating mode of the pulse generating circuit；With
And
Main control chip FPGA connect connection with the drive control module and the resonant power, for providing the driving control
The control signal of molding block and the working frequency for adjusting the resonant power,
Wherein, the pulse generating circuit includes at least storage capacitor C1, storage capacitor C2, storage capacitor C3, semiconductor controllably opens
Close Qa1, semiconductor controllable switch Qb1, semiconductor controllable switch Qc1, semiconductor controllable switch Qd1, diode Db1, diode Dc1,
The storage capacitor C2With the semiconductor controllable switch Qa1, the semiconductor controllable switch Qb1, the semiconductor it is controllable
Switch Qc1And the semiconductor controllable switch Qd1Full-bridge circuit is formed,
The capacitance C1It is connect with the both ends of the upper bridge arm of the full-bridge circuit, the capacitance C3With the lower bridge of the full-bridge circuit
The both ends of arm connect, the diode Db1With the diode Dc1Respectively with the semiconductor controllable switch Qb1It is partly led with described
Body controllable switch Qc1Reverse parallel connection.
2. arbitrary polarity high-voltage square-wave superimposed pulses device according to claim 1, it is characterised in that：
Wherein, the resonant power is high-frequency resonant power supply.
3. arbitrary polarity high-voltage square-wave superimposed pulses device according to claim 1, it is characterised in that：
Wherein, the high frequency transformer is manganese-zinc ferrite magnetic ring transformer, which is that boosting becomes
Depressor.
4. arbitrary polarity high-voltage square-wave superimposed pulses device according to claim 1, it is characterised in that：
Wherein, the synchronization isolation method that the type of drive that the drive control module uses is isolated for magnetic core.
5. arbitrary polarity high-voltage square-wave superimposed pulses device according to claim 1, it is characterised in that：
Wherein, the number of the full-bridge circuit is n, n >=1,
The number of the storage capacitor is 2n+1,
The number of the semiconductor controllable switch is 4n,
The number of the diode is 2n.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810257186.7A CN108471255A (en) | 2018-03-27 | 2018-03-27 | A kind of arbitrary polarity high-voltage square-wave superimposed pulses device |
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| CN201810257186.7A CN108471255A (en) | 2018-03-27 | 2018-03-27 | A kind of arbitrary polarity high-voltage square-wave superimposed pulses device |
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| CN111293921A (en) * | 2019-12-30 | 2020-06-16 | 南京理工大学 | Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge |
| CN113765430A (en) * | 2021-10-19 | 2021-12-07 | 上海理工大学 | Novel bipolar high-voltage multi-level converter |
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Application publication date: 20180831 |