CN108471247A - Control method, the device and system of three-level inverter - Google Patents
Control method, the device and system of three-level inverter Download PDFInfo
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- CN108471247A CN108471247A CN201810276352.8A CN201810276352A CN108471247A CN 108471247 A CN108471247 A CN 108471247A CN 201810276352 A CN201810276352 A CN 201810276352A CN 108471247 A CN108471247 A CN 108471247A
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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
Abstract
This application provides a kind of control method of three-level inverter, device and system.The circuit performance of three-level inverter can be improved.This method includes：Control signal is generated, control signal is used to control the break-make of the switching tube in the switch transformed circuit in three-level inverter according to modulated signal, wherein in the zero crossing time interval of modulated signal, the configuration for controlling signal makes：Second switch pipe, third switching tube, the 5th switching tube and the 6th switching tube respectively carry out on off operating mode switching, and third switching tube is both turned on the 5th switching tube in first time section, six switching tubes of second switch Guan Yu are both turned in the second time interval, first time section with the second time interval non-overlapping copies or partly overlap；Control signal is exported to switch transformed circuit.
Description
Technical field
This application involves electronic circuit field more particularly to a kind of control method of three-level inverter, device and system.
Background technology
Three-level inverter is widely used in various industrial occasions.Three-level inverter becomes for generating according to modulated signal
The pulse train of change.A kind of common three-level inverter be active neutral-point-clamped (active neutral point clamp,
ANPC) type three-level inverter.Fig. 1 is the schematic diagram of ANPC three-level inverters.As shown in Figure 1, ANPC three-level inverters
Including switch transformed circuit.Switch transformed circuit includes six switching tubes 101~106.Control signal G1~G6 is controlled respectively to be opened
Close the turn-on and turn-off of pipe 101~106 so that switch transformed circuit exports the pulse train changed according to modulated signal.According to
The operation principle of ANPC three-level inverters, when modulated signal passes through zero crossing, second switch pipe 102, third switching tube
103, the on off operating mode of the 5th switching tube 105 and the 6th switching tube 106 is intended to switch (is switched to pass by conducting state
Disconnected state, or conducting state is switched to by off state).Zero crossing refers to the point that the voltage value of modulated signal is zero, modulation letter
Number usually in zero crossing by just becoming negative or being become just by negative.Ideal output of the three-level inverter in zero crossing handoff procedure is zero
Level.But in the related art, above-mentioned multiple switch pipe can make switch transformed circuit during carrying out on off operating mode switching
Output end generate positive electricity flat pulse or negative electricity flat pulse, lead to current distortion, influence the performance of three-level inverter.
Invention content
The application provides a kind of control method of three-level inverter, device and system, can improve three-level inverter
Circuit performance.
In a first aspect, providing a kind of control method of three-level inverter, which is characterized in that the three-level inverter
Including bleeder circuit (20) and switch transformed circuit (10), the bleeder circuit (20) is configured as output positive level, negative level
And zero level；The switch transformed circuit (10) includes six switching tubes (101,102,103,104,105,106), wherein first
The positive level that switching tube (101) is exported to the 4th switching tube (104) in the bleeder circuit (20) and the negative level it
Between be serially connected, and the first end of the second end of second switch pipe (102), third switching tube (103) is connected with the zero level,
5th switching tube (105) is serially connected with the 6th switching tube (106), and the first end of the 5th switching tube (105) with it is described
The first end of second switch pipe (102) is connected, the second end of the 6th switching tube (106) and the third switching tube (103)
Second end be connected, the second end of the 5th switching tube (105), the first end of the 6th switching tube (106) are opened with described
The output end for closing translation circuit (10) is connected, and the control method includes：Control signal is generated, the control signal is used for basis
Modulated signal controls the break-make of six switching tubes (101,102,103,104,105,106), wherein in the modulated signal
Zero crossing time interval in, it is described control signal configuration make：The second switch pipe (102), the third switching tube
(103), the 5th switching tube (105) and the 6th switching tube (106) respectively carry out on off operating mode switching, and the third is opened
It closes pipe (103) to be both turned in first time section with the 5th switching tube (105), the second switch pipe (102) and institute
It states the 6th switching tube (106) to be both turned in the second time interval, the first time section and second time interval are mutual
It is not overlapped or partly overlaps；The control signal is exported to the switch transformed circuit (10).
In the embodiment of the present application, in zero crossing time interval, by configuration control signal so that：Third switching tube
103 and the 5th switching tube be held in first time section；And in second switch pipe 102 and the 6th switching tube 106
It is held in the second time interval.To any moment in zero crossing time interval, third switching tube 103 and the
At least one of five switching tubes 105 are in the conduction state, so that in zero crossing time interval, when output current is more than zero
When, the output end of switch transformed circuit 10 remains guiding path with the zero level end of bleeder circuit 20, so that switch
Output voltage of the translation circuit 10 in zero crossing time interval is maintained at zero level.Similarly, in zero crossing time interval
Any moment, at least one of second switch pipe 102 and the 6th switching tube 106 are in the conduction state, so that in mistake
In zero crossing time section, when output current is less than zero, the zero level of the output end and bleeder circuit 20 of switch transformed circuit 10
End remains guiding path, so that output voltage of the switch transformed circuit 10 in zero crossing time interval is maintained at zero
Level.Using the above method, the extra arteries and veins of the generation of the output voltage of three-level inverter can be avoided when zero crossing switches
Punching, the case where to reduce current distortion.
In addition, above-mentioned first time section and the second time interval non-overlapping copies or partly overlapping so that can be neatly
Control sequential of each switching tube in zero crossing time interval is configured, the sequential to improve three-level inverter configures flexible
Property.
In one possible implementation, the modulated signal in the zero crossing time interval by just becoming negative,
In the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) is switched by off state
For conducting state, the 5th switching tube (105) is switched to off state by conducting state；And the second switch pipe
(102) off state is switched to by conducting state, the 6th switching tube (106) is switched to conducting state by off state.
In one possible implementation, the modulated signal in the zero crossing time interval by it is negative become just,
In the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) is switched by conducting state
For off state, the 5th switching tube (105) is switched to conducting state by off state；And the second switch pipe
(102) conducting state is switched to by off state, the 6th switching tube (106) is switched to off state by conducting state.
In one possible implementation, the modulated signal is sinusoidal signal.
Second aspect, provides a kind of control device of three-level inverter, and the three-level inverter includes partial pressure electricity
Road (20) and switch transformed circuit (10), the bleeder circuit (20) are configured as output positive level, negative level and zero level；Institute
It includes six switching tubes (101,102,103,104,105,106), wherein first switch pipe (101) to state switch transformed circuit (10)
It is serially connected to the 4th switching tube (104) positive level exported in the bleeder circuit (20) and between the negative level,
The second end of second switch pipe (102), the first end of third switching tube (103) are for connecting the zero level, the 5th switching tube
(105) it is serially connected with the 6th switching tube (106), and the first end of the 5th switching tube (105) and the second switch pipe
(102) first end is connected, the second end phase of the second end of the 6th switching tube (106) and the third switching tube (103)
Even, the second end of the 5th switching tube (105), the first end of the 6th switching tube (106) and the switch transformed circuit
(10) output end is connected, and the control device is connected with the switch transformed circuit (10), and the control device includes：It generates
Unit, for generating control signal, the control signal be used for according to modulated signal control six switching tubes (101,102,
103,104,105,106) break-make, wherein in the zero crossing time interval of the modulated signal, the control signal is matched
Set so that：The second switch pipe (102), the third switching tube (103), the 5th switching tube (105) and the described 6th
Switching tube (106) respectively carries out break-make switching, and the third switching tube (103) and the 5th switching tube (105) are at first
Between be both turned in section, the second switch pipe (102) is led with the 6th switching tube (106) in the second time interval
It is logical, it the first time section and the second time interval non-overlapping copies or partly overlaps；Output unit, for being opened to described
It closes translation circuit (10) and exports the control signal.
In one possible implementation, the modulated signal in the zero crossing time interval by just becoming negative,
In the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) is switched by off state
For conducting state, the 5th switching tube (105) is to be switched off state by conducting state；And the second switch pipe is by leading
Logical state is switched to off state, and the 6th switching tube is switched to conducting state by off state.
In one possible implementation, the modulated signal in the zero crossing time interval by it is negative become just,
In the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) is switched by conducting state
For off state, the 5th switching tube (105) is switched to conducting state by off state；And the second switch pipe
(102) conducting state is switched to by off state, the 6th switching tube (106) is switched to off state by conducting state.
In one possible implementation, the modulated signal is sinusoidal signal.
The third aspect provides a kind of control system of three-level inverter, including：Three-level inverter and control fill
It sets, the three-level inverter includes bleeder circuit (20) and switch transformed circuit (10), and the bleeder circuit (20) is configured
For output positive level, negative level and zero level；The switch transformed circuit (10) include six switching tubes (101,102,103,
104,105,106), wherein first switch pipe (101) exported to the 4th switching tube (104) in the bleeder circuit (20) it is described
It is serially connected between positive level and the negative level, the second end of second switch pipe (102), the first of third switching tube (103)
End is connected with the zero level, and the 5th switching tube (105) is serially connected with the 6th switching tube (106), and the described 5th opens
The first end for closing pipe (105) is connected with the first end of the second switch pipe (102), and the second of the 6th switching tube (106)
End is connected with the second end of the third switching tube (103), the second end of the 5th switching tube (105), the 6th switch
The first end of pipe (106) is connected with the output end of the switch transformed circuit (10), the control device and the switch change-over
Circuit (10) is connected, and the control device is described in the possible realization method of any one of second aspect or second aspect
Control device.
Description of the drawings
Fig. 1 is the circuit diagram of the ANPC type three-level inverters of the embodiment of the present application.
Fig. 2 is the waveform diagram of the Sinusoidal Pulse Width Modulation of the embodiment of the present application.
Fig. 3 is sequential logic figure of the control signal of the relevant technologies in modulated signal zero crossing.
Fig. 4 is the flow diagram of the control method of the three-level inverter of the embodiment of the present application.
Fig. 5 is the circuit working state schematic diagram in the zero crossing time interval of the embodiment of the present application.
Fig. 6 is the circuit working state schematic diagram in the zero crossing time interval of the another embodiment of the application.
Fig. 7 is the time diagram of the zero crossing time interval of the embodiment of the present application.
Fig. 8 is the time diagram of the zero crossing time interval of the another embodiment of the application.
Fig. 9 is a kind of system architecture schematic diagram of the embodiment of the present application.
Figure 10 is a kind of schematic diagram of realization method of the embodiment of the present application.
Figure 11 is the schematic diagram of the control device of the embodiment of the present application.
Figure 12 is the schematic diagram of the control system of the three-level inverter of the embodiment of the present application.
Specific implementation mode
Below in conjunction with attached drawing, the technical solution in the application is described.
In order to make it easy to understand, introducing the three-level inverter of the embodiment of the present application and its work original of control method first
Reason.In the application by taking ANPC type three-level inverters as an example, three-level inverter is introduced.Wherein, neutral-point-clamped refers to
" midpoint " of DC power supply is connected with the ground of exchange side.Above-mentioned " midpoint " can refer to the output level of DC power supply two/
One level.For the output end of three-level inverter, above-mentioned " midpoint " i.e. zero level.
Fig. 1 is the circuit diagram of the ANPC type three-level inverters of the embodiment of the present application.As shown in Figure 1, the ANPC types
Three-level inverter includes bleeder circuit 20 and switch transformed circuit 10.The input terminal of bleeder circuit 20 can be with direct voltage source
It is connected.The output end of bleeder circuit 20 is for exporting positive level, negative level and zero level.Zero level, that is, above-mentioned direct voltage source
The mid point level of output level.Switch transformed circuit 10 includes six switching tubes, i.e. 101 to the 6th switching tube of first switch pipe
106.Switch transformed circuit 10 is connected with bleeder circuit 20.Wherein, 101 to the 4th switching tube 104 of first switch pipe is at described point
It is serially connected between the positive level and the negative level of volt circuit output.The second end of second switch pipe 102, third switch
For connecting the zero level, the 5th switching tube 105 is serially connected the first end of pipe 103 with the 6th switching tube 106, and described the
The first end of five switching tubes 105 is connected with the second end of second switch pipe 103, the second end of the 5th switching tube 105, the 6th switch
The first end of pipe 106 is connected with the output end of switch transformed circuit 10.
Wherein, the above-mentioned switching tube (i.e. switching tube 101~106) being related to can be that by the electronics device of switching function
Part.For example, above-mentioned switching tube can be bipolar junction transistor (bipolar junction transistor, BJT), or
Person can also be metal oxide semiconductor field effect tube (metal oxide semiconductor field effect
transistor,MOSFET).Alternatively, above-mentioned switching tube can be insulated gate bipolar transistor (insulated gate
bipolar transistor,IGBT).IGBT is made of power transistor (giant transistor, GTR) and MOSFET
Compound full control property voltage driven type power semiconductor, the low conducting of the high input impedance and GTR of MOSFET can be had concurrently
Advantage of both pressure drop.Therefore, IGBT is suitable for the large-power occasions of mesohigh.Wherein, GTR can refer to high pressure resistant, big electricity
The BJT of stream.
The first end and second end of above-mentioned switching tube is used to indicate the both ends of switching tube.For example, if above-mentioned switching tube is BJT
Or IGBT, then the first end and second end of above-mentioned each switching tube can be used for indicating respectively the collector or emitter of switching tube,
Control signal for controlling switching tube break-make can load on the base electrode of switching tube.If above-mentioned switching tube is MOSFET,
The first end and second end of above-mentioned each switching tube may be respectively used for source electrode or the drain electrode of instruction switching tube, for controlling switching tube
The control signal of break-make can load on the grid of switching tube.
Optionally, in the switch transformed circuit 10 of the application further include the first diode D6 of diode D1~the 6th.Two poles
Pipe D1~D6 is corresponded with 101 to the 6th switching tube 106 of first switch pipe.Wherein, above-mentioned diode is and switching tube respectively
Antiparallel fly-wheel diode.For example, the first diode D1 and 101 inverse parallel of first switch pipe, the second diode D2 and second
102 inverse parallel of switching tube.
The embodiment of the present application is not construed as limiting the structure of above-mentioned bleeder circuit 20, as long as it can realize voltage divide function, externally
Export high level, low level and zero level.For example, bleeder circuit 20 can be made of concatenated capacitance C1 and capacitance C2.
When ANPC three-level inverters work, by exporting control signal to three-level inverter to control switching tube
101~106 break-make.Above-mentioned control signal can be generated according to modulated signal.Optionally, signal G1~G6 and switching tube are controlled
101~106 correspond successively.For example, first control signal G1 is used to control the break-make of first switch pipe 101, the second control
Signal G2 is used to control the break-make of second switch pipe 102, and the rest may be inferred by analogy.When ANPC three-level inverters work, opened the 5th
In the case of closing the conducting of pipe 105, the state of first switch pipe 101 and second switch pipe 102 is complementary, and three-level inverter exports
Positive pulse sequence.When above-mentioned state complementation can refer to the conducting of first switch pipe 101, second switch pipe 102 turns off；First switch pipe
When 101 shutdown, second switch pipe 102 is connected.In the case where the 6th switching tube 106 is connected, third switching tube 103 and the 4th is opened
The state for closing pipe 104 is complementary, and three-level inverter exports negative pulse train.In addition, the 5th switching tube 105 and the 6th switching tube
106 state is complementary.
Optionally, can also be connected with filter circuit (Fig. 1 is not shown) in the output end of switch transformed circuit 10.The filter
The pulse train that wave circuit can export switching circuit 10 is filtered.Under normal conditions, switch transformed circuit 10 and filter
Inductance in wave circuit is connected.
In the case where ANPC type three-level inverters work, the switching tube 104 of first switch pipe 101~the 4th is with very high
Frequency carries out switch motion.Therefore 101 to the 4th switching tube 104 of first switch pipe can be known as HF switch.And the 5th opens
It closes pipe 105 and the 6th switching tube 106 and switch motion is carried out according to the variation of modulated signal, therefore by the 5th switching tube 105 and the
Six switching tubes are known as power frequency switch.
The pulse width of the pulse train of ANPC three-level inverters output is changed according to modulated signal.The application is real
Example is applied not to be restricted the waveform of modulated signal.For example, modulated signal can be sinusoidal signal, triangular wave or other waveforms
Signal.In order to make it easy to understand, next will be former to the control of ANPC three-level inverters by taking modulated signal is sinusoidal signal as an example
Reason is introduced.When modulated signal is sinusoidal signal, the duty ratio of pulse train changes according to sinusoidal rule.For example, when sine
When value is maximum value, the width of pulse is also maximum, and the interval between pulse is minimum.Conversely, when sine value is smaller, the width of pulse
Degree is also smaller, and the interval between pulse is then larger.It is properly termed as Sinusoidal Pulse Width Modulation above.In order to make three-level inverter
The pulse width of the pulse train of output changes with sinusoidal rule.Modulated signal can be compared with two triangular carriers,
To determine the state of control signal G1~G6 of 101 to the 6th switching tube 106 of first switch pipe.Wherein, above-mentioned two triangle carries
Wave can be respectively the first triangular carrier and the second triangular carrier.First triangular carrier is used to believe with the modulation in positive half period
It number is compared, the second triangular carrier with the modulated signal in negative half-cycle for being compared.
Fig. 2 is the waveform diagram of the Sinusoidal Pulse Width Modulation of the embodiment of the present application.As shown in Fig. 2, in modulated signal
Positive half period, the 5th control signal G5 is high level, and the 6th control signal G6 is low level.When modulated signal is more than the one or three
When the carrier wave of angle (carrier wave 1 in Fig. 2), first control signal G1 is high level, and second control signal G2 is low level.Work as sine
When modulated signal is less than the first triangular carrier, first control signal G1 is high level, and second control signal G2 is high level.Third
The controls of control signal G3 and the 4th signal G4 keeps low level.In switching tube 101~106 according to above-mentioned control signal G1-G6
When carrying out on off operating mode switching, switch transformed circuit 20 exports the pulse train changed according to sinusoidal rule.
Wherein, the switching tube 101~106 in Fig. 2 is N-type transistor, therefore is high electricity in above-mentioned control signal G1~G6
Usually, switching tube 101~106 is conducting state, and when above-mentioned control signal G1~G6 is low level, switching tube 101~106 is
Closed state.In other application environment, if switching tube be P-type transistor, control signal G1~G6 be high level when, switch
Pipe 101~106 is in off state, and when it is low level to control signal G1~G6, switching tube 101~106 is conducting state.This Shen
Please in by switching tube be N-type transistor for illustrate, but this and be not belonging to switch tube type limitation.
In the negative half-cycle of sinusoidal modulation signal, the 6th control signal G6 is high level, and the 5th control signal G5 is low electricity
It is flat.When modulated signal is more than the second triangular carrier (i.e. carrier wave 2 in Fig. 2), it is high level, the 4th control that third, which controls signal G3,
Signal G4 processed is low level.When modulated signal is less than the second triangular carrier, it is low level, the 4th control that third, which controls signal G3,
Signal G4 is high level.First control signal G1 and second control signal G2 remain low level.
It should be noted that in the embodiment of the present application zero crossing instruction be modulated signal voltage value be zero point,
Modulated signal is in zero crossing by just becoming negative or being become just by negative.Three-level inverter generally use is digital control, according to fixed control
Cycle operation control algolithm processed.Zero crossing time interval in the embodiment of the present application can refer to residing for the zero crossing of modulated signal
Controlling cycle.In other words, zero crossing time interval can refer to time of the modulated signal by zero crossing and near zero-crossing point when
Section.Zero crossing time interval can be the time interval for including zero crossing, and in zero crossing time interval, switch change-over
The ideal output of circuit 20 is zero level.In other words, zero crossing time interval includes zero crossing, and 101 He of first switch pipe
4th switching tube 104 is off state in zero crossing time interval.Zero crossing switching in the embodiment of the present application can refer to
The handoff procedure that above-mentioned each switching tube occurs in zero crossing time interval.In addition, if modulated signal is according to periodic transformation
Signal, then above-mentioned modulated signal negative half-cycle, above-mentioned modulation letter are transitioned by positive half period by just becoming the negative modulated signal that can refer to
Number can just refer to modulated signal by negative change is transitioned into positive half period by negative half-cycle.If above-mentioned modulated signal is aperiodic transformation
Signal, then above-mentioned modulated signal negative voltage stage, above-mentioned modulation letter are transitioned by positive voltage by just becoming the negative modulated signal that can refer to
Number the stage that modulated signal is transitioned by negative voltage positive voltage can just referred to by negative change.
From Figure 2 it can be seen that when modulated signal is by just becoming negative, the control signals of second control signal G2 and the 5th G5 is from high electricity
Truncation is changed to low level, and the third controls of control signal G3 and the 6th signal G6 is switched to high level from low level.First control
The controls of signal G1 and the 4th signal G4 remains low level.In the zero-crossing timing section of modulated signal, second control signal
State switching has occurred in G2, third control signal G3, the 5th control signal G5 and the 6th control signal G6.In zero crossing
Between in section, the ideal output of switch transformed circuit 20 be that ideal export of zero level namely three-level inverter is zero level.
But in the related art, dead time is added in the handoff procedure of above-mentioned switching tube, to the meeting in zero crossing switching
So that the output end of switch transformed circuit is generated positive electricity flat pulse or negative electricity flat pulse, leads to current distortion, influence tri-level inversion
The performance of device.
Fig. 3 is sequential logic figure of the control signal of the relevant technologies in modulated signal zero crossing.As shown in figure 3, adjusting
When signal processed is by just becoming negative, second switch pipe 102 is turned off first；By certain dead time TaTurn off the 5th switching tube again afterwards
105；Pass through certain dead time T laterbLater, the 6th switching tube 106 is opened；Using certain dead time TcLater,
Open third switching tube 103；Thereafter according to general Sine Wave Pulse Width Modulation (sinusoidal pulse width
Modulation, SPWM) method generate switching tube 101~106 control signal.Become timing by negative in modulated signal, closes first
Disconnected third switching tube 103；By certain dead time TeLater, the 6th switching tube 106 is being turned off；When passing through certain dead zone later
Between TfThe 5th switching tube 105 is opened later；Then pass through certain dead time TdLater, second switch pipe 102 is opened；Hereafter
The control signal of switching tube 101~106 is generated according to general SPWM methods.
In control method shown in Fig. 3, ensureing that HF switch (second switch pipe 102 or third switching tube 103) is complete
The fully closed disconnected power frequency that turns off later switchs (the 5th switching tube 105 or the 6th switching tube 106), or is ensureing that power frequency switch is complete
Open and then open HF switch.But it can cause in zero crossing time interval in this way, three-level inverter
High level pulse or low level pulse are exported, and the ideal output in zero crossing time interval should be zero level, thus cause
Current distortion in zero crossing time interval.
In order to solve the above-mentioned technical problem, the embodiment of the present application proposes a kind of control method of three-level inverter.Fig. 4
It is the schematic flow chart of the control method.The control method includes step S401 and S402.Particular content is as follows：
S401. control signal is generated, the control signal is used to control the logical of switching tube 101~106 according to modulated signal
It is disconnected.
Wherein, in the zero crossing time interval of the modulated signal, the configuration of the control signal makes：Described second
Switching tube 102, the third switching tube 103, the 5th switching tube 105 and the 6th switching tube 106 respectively carry out break-make shape
State switches, and the third switching tube 103 is both turned on the 5th switching tube 105 in first time section, and described second
Switching tube 102 is both turned on the 6th switching tube 106 in the second time interval, the first time section and described second
Time interval non-overlapping copies partly overlap.
Optionally, the control signal may include that first control signal G1 to the 6th controls signal G6, the control letter
Number G1~G6 and switching tube 101-106 is corresponded successively.
Optionally, the first time section and second time interval are respectively positioned in the zero crossing time interval,
The zero crossing time interval includes the modulated signal by just becoming negative, or by it is negative become positive at the time of, and the control signal
Configuration is so that 101 and the 4th switching tube 104 of the first switch pipe is in off state in the zero crossing time interval.
Wherein, above-mentioned on off operating mode switching refers to that switching tube is switched to off state by conducting state, or by shutdown shape
State is switched to conducting state.During zero crossing switches, third switching tube 103 and the 5th switching tube 105 can be at the first time
It is tended to remain in section.In other words, any time in zero crossing time interval, third switching tube 103 and
At least one of five switching tubes 105 are in the conduction state.Likewise, any time in zero crossing time interval, second
At least one of switching tube 102 and the 6th switching tube 106 are in the conduction state.Wherein, first time section, the second time zone
Between can be any one section of time interval in the zero crossing time interval.And first time section and the second time interval are mutual
It is not overlapped or partly overlaps.By taking this method, can ensure in zero crossing time interval, switch transformed circuit 10
Guiding path is always existed between output end and the zero level of bleeder circuit 20, so as to reduce in zero crossing time interval
The output signal of three-level inverter generates current distortion, improves the working performance of three-level inverter.
Optionally, the length of above-mentioned first time section and the second time interval can be arranged according to actual conditions.For example,
It can be microsecond (μ s) rank, can also be the value that other are more than zero.
S402. the switch transformed circuit into three-level inverter exports the control signal.
It should be noted that the embodiment of the present application only improves the control sequential of each switching tube in zero crossing time interval,
In the other times except zero crossing time interval, control signal can be generated according to traditional control method, be opened with control
Close the on off operating mode of pipe.
In the embodiment of the present application, in zero crossing time interval, by configuration control signal so that：Third switching tube
103 and the 5th switching tube be held in first time section；And in second switch pipe 102 and the 6th switching tube 106
It is held in the second time interval.To any moment in zero crossing time interval, third switching tube 103 and the
At least one of five switching tubes 105 are in the conduction state, so that in zero crossing time interval, when output current is more than zero
When, the output end of switch transformed circuit 10 remains guiding path with the zero level end of bleeder circuit 20, so that switch
Output voltage of the translation circuit 10 in zero crossing time interval is maintained at zero level.Similarly, in zero crossing time interval
Any moment, at least one of second switch pipe 102 and the 6th switching tube 106 are in the conduction state, so that in mistake
In zero crossing time section, when output current is less than zero, the zero level of the output end and bleeder circuit 20 of switch transformed circuit 10
End remains guiding path, so that output voltage of the switch transformed circuit 10 in zero crossing time interval is maintained at zero
Level.
Using the above method, the generation of the output voltage of three-level inverter can be avoided extra when zero crossing switches
Pulse, the case where to reduce current distortion.
In addition, above-mentioned first time section and the second time interval non-overlapping copies or partly overlapping so that can be neatly
Control sequential of each switching tube in zero crossing time interval is configured, the sequential to improve three-level inverter configures flexible
Property.For example, can be according to the conducting speed speed of switching tube, in the case where meeting the requirement of S401 steps, flexible configuration is each
The control sequential of switching tube.
In the embodiment of the present application, by using the above method, three-level inverter can be avoided when zero crossing switches
Output voltage the extra pulse of generation, the case where to reduce current distortion.
Next the principle of the control method of the application is introduced.In order to make it easy to understand, introducing electric current in the related technology first
Distort Producing reason.Fig. 5 shows the circuit working state schematic diagram in the zero crossing time interval of the embodiment of the present application.Its
In, zero crossing time interval in Fig. 5 is modulated signal by just becoming the negative period, and switch transformed circuit is assumed in Fig. 5
10 output current before zero crossing switching is more than zero, i.e. output current direction is to be flowed to load by switch transformed circuit 10.
When zero crossing switches, it is assumed that the T1 moment, T2 moment, T3 moment in zero crossing time interval and T4 moment, the second control
Signal G2, the 5th control signal G5, the 6th control signal G6 and third control signal G3 carry out on off operating mode switching successively.Cause
This, in zero crossing time interval, switch transformed circuit 10 experienced five different states successively.
Wherein, first state is happened at zero crossing time interval and starts to before the T1 moment, at this time second switch pipe 102 with
5th switching tube 105 is conducting state, and rest switch pipe is turned off, and the output end of switch transformed circuit 10 passes through the second diode
There are guiding path between D2, the 5th switching tube 105 and the zero level of bleeder circuit 20, therefore the output of switch transformed circuit 10
Voltage is zero level.Wherein, since the second diode D2 conductings, second switch pipe 102 are short-circuited, electric current is without second
Switching tube 102.
Second state was happened between T1 moment and T2 moment, at this point, second switch pipe 102 is switched to shutdown by conducting,
5th switching tube 105 is held on, and rest switch pipe is turned off, at this time with 102 antiparallel second diode of second switch pipe
D2 is still in conducting state, therefore, between the zero level end and the output end of switch transformed circuit 10 of bleeder circuit 20 according to
So there are guiding paths, therefore the output voltage of switch transformed circuit 10 is still zero level.
The third state was happened between T2 moment and T3 moment, and the 5th switching tube 105 is switched to shutdown by conducting at this time, and
Rest switch pipe is in off state.It is not deposited between the zero level end and the output end of switch transformed circuit 10 of bleeder circuit 20
In guiding path, since the output end of switch transformed circuit 10 is usually connected with the inductance in filter circuit, and inductance has resistance
Hinder the function of curent change.Therefore, at the time of the 5th switching tube 105 turns off, the electric current of the output end of switch transformed circuit 10
Size and Orientation will not be mutated.In order to maintain electric current, the output end of switch transformed circuit 10 to pass through the 4th diode D4 and
Six diode D6 extract electric current from the negative electricity flush end of bleeder circuit 20.In other words, the output end of switch transformed circuit 10 with point
There are guiding paths for the negative electricity flush end of volt circuit 20.Therefore, in a third condition, the voltage of the output end of switch transformed circuit 10
For negative level.
4th state was happened between T3 moment and T4 moment, and the 6th switching tube 106 is switched to conducting by shutdown at this time,
Remaining switching tube is off state.The zero level end of the output end of switch transformed circuit 10 and bleeder circuit 20, which is still not present, leads
Path.The output end of switch transformed circuit 10 is connected with the negative electricity flush end of bleeder circuit 20, i.e., switch transformed circuit 10 exports
Negative level.Wherein, since the 6th diode D6 conductings, the 6th switching tube 106 are short-circuited, electric current is without the 6th switching tube
106。
5th state was happened at after the T4 moment, until zero crossing time interval terminates.Third switching tube 103 is by closing at this time
Disconnected to be switched to conducting, the 6th switching tube 106 is held on, and rest switch pipe is closed.Therefore, the output end of switch transformed circuit 10
By the zero level end of third switching tube 103, the 6th diode D6 and bleeder circuit 10, there are guiding paths.Therefore switch change-over
The output of circuit 10 is zero level
From above-mentioned analysis as it can be seen that when the output current of switch transformed circuit 10 is more than zero, the third state and the 4th state
Under, switch transformed circuit 10 will produce the case where output voltage is negative level, and negative level is exported so as to cause three-level inverter
Pulse.Specifically, during zero crossing switches, in the period that the 5th switching tube 105 is simultaneously turned off with third switching tube 103
It is interior, guiding path is not present between the zero level end of switch transformed circuit 10 and bleeder circuit 20, leads to switch transformed circuit 10
Output end be connected with the negative electricity flush end of bleeder circuit 20 so that switch transformed circuit 10 export negative level.So as to cause output
Voltage generates extra pulse so that output current is distorted.
Fig. 5 with modulated signal by just becoming negative, and 10 output current of switch transformed circuit be more than zero for the application
Control principle illustrate.Fig. 6 is the circuit working state signal in the zero crossing time interval of the another embodiment of the application
Figure.
Next proceed to combine Fig. 6, describe switch transformed circuit 10 output current it is minus in the case of voltage it is prominent
Become Producing reason and control principle.Wherein, the output current of above-mentioned switch transformed circuit 10 refers to output current less than zero
Direction is to be flowed into from load to three-level inverter.Identical as Fig. 5, the zero crossing time interval in Fig. 6 is modulated signal by just
Become the negative period.When zero crossing switches, it is assumed that T1 moment, T2 moment, T3 moment in zero crossing time interval and
At the T4 moment, second control signal G2, the 5th control signal G5, the 6th control signal G6 and third control signal G3 are according to successively suitable
Sequence completion status switches.In zero crossing time interval, switch transformed circuit 10 experienced five different states successively.
Wherein, first state is happened at zero crossing time interval and starts to before the T1 moment, at this time second switch pipe 102 with
5th switching tube 105 is conducting state, and rest switch pipe is turned off, and the output end of switch transformed circuit 10 passes through second switch pipe
102 and the 5th between diode D5 and the zero level of bleeder circuit 10 there are guiding path, therefore switch transformed circuit 10
Output voltage is zero level.Wherein, due to the 5th diode D5 conducting, the 5th switching tube 105 is short-circuited, electric current without
5th switching tube 105.
Second state was happened between T1 moment and T2 moment, at this point, second switch pipe 102 is switched at the T1 moment by conducting
For shutdown, the 5th switching tube 105 is held on, and rest switch pipe is turned off, at this time the zero level end of bleeder circuit 20 and switch
Guiding path is not present between the output end of translation circuit 10.Due to switch transformed circuit 10 output end usually and filter circuit
In inductance be connected, and inductance have the function of obstruction curent change.Therefore, at the time of second switch pipe 102 turns off, switch
The size of current of 10 output end of translation circuit will not be mutated.In order to maintain electric current, the positive electricity flush end of bleeder circuit 10 to pass through first
Diode D1, the 5th diode D5 extract electric current to the output end of switch transformed circuit 10.In other words, switch transformed circuit 10
The positive electricity flush end of output end and bleeder circuit 20 there are guiding paths.Therefore, in the second condition, switch transformed circuit 10
The voltage of output end is positive level.
The third state was happened between T2 moment and T3 moment, and the 5th switching tube 105 is switched to pass at the T2 moment by being connected
It is disconnected, and rest switch pipe is in off state.The zero level end of bleeder circuit 20 and the output end of switch transformed circuit 10 according to
Guiding path is so not present.The output end of switch transformed circuit 10 passes through the 5th diode D5 and the first diode D1 and partial pressure
The positive electricity flush end of circuit 20 is connected.I.e. switch transformed circuit 10 exports positive level.
4th state was happened between T3 moment and T4 moment, and the 6th switching tube 106 is led at the T3 moment by turning off to be switched to
It is logical, and rest switch pipe is in off state.The output end of switch transformed circuit 10 passes through the 6th switching tube the 106, the 3rd 2
Pole pipe D3 is connected with the zero level end of bleeder circuit 20.I.e. the output of switch transformed circuit 10 is zero level.
5th state is happened at T4 moment to zero crossing time interval and terminates.Third switching tube 103 is switched to by shutdown leads
Logical, the 6th switching tube 106 is held on, and rest switch pipe is closed.Switch transformed circuit 10 passes through the 6th switching tube 106, third
Diode D3 is connected with the zero level end of bleeder circuit 20.I.e. the output of switch transformed circuit 10 is zero level.Wherein, due to
Three diode D3 conductings, therefore third switching tube 103 is short-circuited, electric current is without third switching tube 103.
From above-mentioned analysis as it can be seen that when the output current of switch transformed circuit 10 is less than zero, the second state and the third state
Under, it will produce the case where output voltage is positive level.In the time that second switch pipe 102 and the 6th switching tube 106 simultaneously turn off
In section, guiding path is not present between the zero level end of switch transformed circuit 10 and bleeder circuit 20, leads to switch transformed circuit
10 output end is connected with the positive electricity flush end of bleeder circuit 20 so that switch transformed circuit 10 exports negative level, so as to cause three
The output voltage of electrical level inverter generates positive pulse so that output current is distorted.
In addition, zero crossing time interval be modulated signal by negative become just in the case of, the reason of generating voltage jump with
Modulated signal by just becoming negative in the case of it is similar.I.e. in the case where the output current of switch transformed circuit 10 is more than zero, when the
When three switching tubes 103 and the 5th switching tube 105 simultaneously turn off, the output negative electricity flat pulse of three-level inverter will be caused.It is opening
Close translation circuit 10 output current it is minus in the case of, when second switch pipe 102 and the 6th switching tube 106 simultaneously turn off
When, three-level inverter will be caused to export positive electricity flat pulse.It is repeated no more in the embodiment of the present application.
In conjunction with the analysis of Fig. 5 to Fig. 6, to solve the above-mentioned problems, the embodiment of the present application is proposed in zero crossing handoff procedure
In, configure the control signal so that：Third switching tube 103 and the 5th switching tube keep leading in first time section
It is logical；And it is held in the second time interval in second switch pipe 102 and the 6th switching tube 106.To in zero crossing
Any moment in time interval, at least one of third switching tube 103 and the 5th switching tube 105 are in the conduction state, this
Sample makes in zero crossing time interval, when output current is more than zero, output end and the bleeder circuit 20 of switch transformed circuit 10
Zero level end remain guiding path so that output voltage of the switch transformed circuit 10 in zero crossing time interval
It is maintained at zero level.Similarly, any moment in zero crossing time interval, second switch pipe 102 and the 6th switching tube 106
At least one of it is in the conduction state, so that in zero crossing time interval, when output current be less than zero when, switch become
The zero level end of the output end and bleeder circuit 20 that change circuit 10 remains guiding path, so that switch transformed circuit 10
Output voltage in zero crossing time interval is maintained at zero level.
Using the above method, the generation of the output voltage of three-level inverter can be avoided extra when zero crossing switches
Pulse, the case where to reduce current distortion.
Fig. 7 shows several possible sequential signals that signal is controlled when modulated signal is by just becoming negative in the embodiment of the present application
Figure.
Fig. 8 shows that the modulated signal in the embodiment of the present application is shown by the negative several possible sequential for becoming timing control signal
It is intended to.Since on off operating mode switching does not occur for the controls of first control signal G1 in zero crossing time interval and the 4th signal G4, because
This, is not shown the sequence diagram of the control signals of first control signal G1 and the 4th G4 in Fig. 7.Such as (a) and (b) and Fig. 8 in Fig. 7
In (a) and (b) shown in, in zero crossing time interval, first time section and the second time interval can be with non-overlapping copies.Or
Person, as in Fig. 7 (c)-(e) and Fig. 8 in (c)-(f) shown in, first time section and the second time interval can partly weigh
It is folded.In addition, in the case of the description of the S401 in meeting Fig. 4, each switching tube may be used various sequential and carry out on off operating mode
Switching.For example, in (a) of Fig. 7, break-make transfer sequence of the switching tube in zero crossing time interval is followed successively by the 6th switching tube
106, second switch pipe 102, third switching tube 103, the 5th switching tube 105.Alternatively, as shown in (d) in Fig. 7, in zero crossing
In time interval, the transfer sequence of each switching tube be followed successively by the 6th switching tube 106, third switching tube 103, second switch pipe 102,
5th switching tube 105.Remaining sequence diagram in Fig. 7 and Fig. 8 is no longer enumerated one by one.
Fig. 9 is a kind of possible system architecture schematic diagram of the embodiment of the present application.In application scenes, three level are inverse
The transformation of direct current energy and AC energy can be carried out by becoming device.For example, as shown in figure 9, three-level inverter can connect direct current
System and AC system, direct current side senser detect DC voltage and current signal, exchange side senser detection exchange side electricity
Pressure and current signal.After control software receives the voltage and current signals of DC side and exchange side, write by programming language
Program performs mathematical calculations to generate above-mentioned modulated signal.Above procedure can become modulation algorithm.Modulation algorithm can basis
Method in modulated signal and the embodiment of the present application generates control signal, to control the switching tube in switch transformed circuit 10
On off operating mode.
It should be noted that the mode of the generation control signal in the embodiment of the present application can be realized by software programming,
It can also be realized, or can also be realized by software and hardware combining by hardware circuit.
Figure 10 is a kind of schematic diagram of realization method of control signal of the embodiment of the present application.In Fig. 10, may be used can
Programmed logic processor writes control program to realize delay logic, the delay logic to traditional source control signal g1-g6 into
After line delay processing, the control signal G1-G6 for being ultimately applied to switch transformed circuit 10 is obtained.First, according to traditional three
SPWM method generating sources control signal g1~g6 of level converter.In the positive half period of modulated signal, g5 is high level, g6
For low level.First comparing unit by modulated signal compared with the first triangular carrier, when modulated signal be more than the first triangular carrier
When, g1 is high level, and g2 is low level；When modulated signal is less than the first triangular carrier, g1 is low level, and g2 is high level.
In the negative half-cycle of modulated signal, g6 is high level, and g5 is low level.First comparing unit carries modulated signal and the second triangle
Bobbi is compared with when modulated signal is more than the second triangular carrier, g3 is high level, and g4 is low level；When modulated signal is less than second
When triangular carrier, g3 is low level, and g4 is high level.
The logic that is delayed controls signal g1-g6 according to source and generates control signal G1~G6.The logic that is delayed is to controlling signal G1-G6
Sequential in zero crossing time interval is adjusted.Within the period except zero crossing time interval, signal G1-G6 is controlled
It is identical as source control signal g1-g6.Specifically, when modulated signal is by just becoming negative, with the control signal G3 of third switching tube 103
Rising edge be reference, the failing edge of the control signal G5 of the 5th switching tube 105 is delayed Td1；With the control of the 6th switching tube 106
The rising edge of signal G6 processed is reference, by the failing edge delay Td2 of the control signal of the control signal G2 of second switch pipe 102.
I.e. the length in first time section is Td1, and the length of the second time interval is Td2.When modulated signal becomes timing by negative, with the 5th
The rising edge of the control signal G5 of switching tube 105 is reference signal, and the failing edge of the control signal G3 of third switching tube 103 is prolonged
When Td3.Rising edge with the control signal G2 of second switch pipe 102 is reference, by the control signal G6's of the 6th switching tube 106
Failing edge delay Td4.I.e. the length in first time section is Td3, and the length of the second time interval is Td4.
In addition, modulated signal exports the control signal g5 of the 5th switching tube 105 by sign function so that modulated signal is big
When zero, control signal g5 is 1, and when modulated signal is less than zero, control signal g5 is 0.Control signal g5 takes that return can by logic
To obtain the control signal g6 of the 6th switching tube 106.
Optionally, the length of above-mentioned first time section and the second time interval can be arranged according to actual conditions.For example,
It can be microsecond (μ s) rank, can also be the value that other are more than zero.
Below in conjunction with attached drawing, continuing on the device of the embodiment of the present application.
Figure 11 is the schematic diagram of the control device 1100 of the three-level inverter of the embodiment of the present application.1100 energy of described device
Enough execute each step in Fig. 4.Device 1100 includes：Generation unit 1101, for generating control signal, the control signal
Break-make for controlling the switching tube in the switch transformed circuit in three-level inverter according to modulated signal, wherein described
In the zero crossing time interval of modulated signal, the configuration of the control signal makes：Second switch pipe 102, third switching tube
103, the 5th switching tube 105 and the 6th switching tube 106 respectively carry out break-make switching, and third switching tube 103 and the 5th switching tube 105
It is both turned in first time section, second switch pipe 102 is both turned on the 6th switching tube 106 in the second time interval, institute
State first time section with the second time interval non-overlapping copies or partly overlap；Output unit 1102, for being opened to described
It closes translation circuit 10 and exports the control signal.
Figure 12 is the schematic diagram of the control system 1200 of the three-level inverter of the embodiment of the present application.The control system
1200 include control device 1100 and three-level inverter 1201 in Figure 11.The three-level inverter 1201 can be Fig. 1
Three-level inverter.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.
The application, which provides technical solution, can pass through hardware realization.For example, the hardware can be central processing unit
(central processing unit, CPU), application-specific integrated circuit (application-specific integrated
Circuit, ASIC) and field programmable gate array (field programmable gate array, FPGA) at least
One.In addition, the application technical solution is provided being implemented in combination with by hardware and software.For example, hardware may include place
Reason device and the memory coupled with processor.Software may include the computer instruction stored in the memory.The place
Managing device can be by accessing the memory computer instructions, to realize technical solution provided by the present application.It is above-mentioned soft
Part can be stored in a computer read/write memory medium.This application provides computer software products.The computer is soft
Part product is stored in a storage medium, including some instructions are used so that a computer equipment (can be individual calculus
Machine, server or network equipment etc.) execute each embodiment the method for the application all or part of step.And it is aforementioned
Storage medium include：USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory
The various media that can store program code such as (Random Access Memory, RAM), magnetic disc or CD.
The above, the only specific implementation mode of the application.Those familiar with the art takes off in the application
In the technical scope of dew, it is contemplated that change or replacement.
Claims (10)
1. a kind of control method of three-level inverter, which is characterized in that the three-level inverter includes bleeder circuit (20)
With switch transformed circuit (10), the bleeder circuit (20) is configured as output positive level, negative level and zero level；The switch
Translation circuit (10) includes six switching tubes (101,102,103,104,105,106), wherein first switch pipe (101) to the 4th
It is serially connected between the positive level and the negative level that switching tube (104) is exported in the bleeder circuit (20), and second
The second end of switching tube (102), the first end of third switching tube (103) are connected with the zero level, the 5th switching tube (105) with
6th switching tube (106) is serially connected, and the first end of the 5th switching tube (105) and the second switch pipe (102)
First end is connected, and the second end of the 6th switching tube (106) is connected with the second end of the third switching tube (103), described
The second end of 5th switching tube (105), the first end of the 6th switching tube (106) are defeated with the switch transformed circuit (10)
Outlet is connected, and the control method includes：
Generate control signal, the control signal be used for according to modulated signal control six switching tubes (101,102,103,
104,105,106) break-make, wherein in the zero crossing time interval of the modulated signal, the configuration of the control signal makes
：The second switch pipe (102), the third switching tube (103), the 5th switching tube (105) and the 6th switch
It manages (106) and respectively carries out on off operating mode switching, and the third switching tube (103) and the 5th switching tube (105) are at first
Between be both turned in section, the second switch pipe (102) is led with the 6th switching tube (106) in the second time interval
It is logical, it the first time section and the second time interval non-overlapping copies or partly overlaps；
The control signal is exported to the switch transformed circuit (10).
2. control method as described in claim 1, which is characterized in that the modulated signal is in the zero crossing time interval
By just becoming negative, in the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) by
Off state is switched to conducting state, and the 5th switching tube (105) is switched to off state by conducting state；And described
Two switching tubes (102) are switched to off state by conducting state, and the 6th switching tube (106) is switched to conducting by off state
State.
3. control method as described in claim 1, which is characterized in that the modulated signal is in the zero crossing time interval
Become just by negative, in the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) by
Conducting state is switched to off state, and the 5th switching tube (105) is switched to conducting state by off state；And described
Two switching tubes (102) are switched to conducting state by off state, and the 6th switching tube (106) is switched to shutdown by conducting state
State.
4. control method as claimed in any one of claims 1-3, which is characterized in that the modulated signal is sinusoidal signal.
5. a kind of control device of three-level inverter, which is characterized in that the three-level inverter includes bleeder circuit (20)
With switch transformed circuit (10), the bleeder circuit (20) is configured as output positive level, negative level and zero level；The switch
Translation circuit (10) includes six switching tubes (101,102,103,104,105,106), wherein first switch pipe (101) to the 4th
It is serially connected between the positive level and the negative level that switching tube (104) is exported in the bleeder circuit (20), second opens
The pipe second end of (102), the first end of third switching tube (103) are closed for connecting the zero level, the 5th switching tube (105) with
6th switching tube (106) is serially connected, and the first end of the 5th switching tube (105) and the second switch pipe (102)
First end is connected, and the second end of the 6th switching tube (106) is connected with the second end of the third switching tube (103), described
The second end of 5th switching tube (105), the first end of the 6th switching tube (106) are defeated with the switch transformed circuit (10)
Outlet is connected, and the control device is connected with the switch transformed circuit (10), and the control device includes：
Generation unit, for generating control signal, the control signal is used to control six switching tubes according to modulated signal
The break-make of (101,102,103,104,105,106), wherein in the zero crossing time interval of the modulated signal, the control
The configuration of signal processed makes：The second switch pipe (102), the third switching tube (103), the 5th switching tube (105)
Break-make switching, and the third switching tube (103) and the 5th switching tube are respectively carried out with the 6th switching tube (106)
(105) it is both turned in first time section, the second switch pipe (102) is with the 6th switching tube (106) at second
Between be both turned in section, the first time section and the second time interval non-overlapping copies or partly overlap；
Output unit, for exporting the control signal to the switch transformed circuit (10).
6. control device as claimed in claim 5, which is characterized in that the modulated signal is in the zero crossing time interval
By just becoming negative, in the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) by
Off state is switched to conducting state, and the 5th switching tube (105) is to be switched off state by conducting state；And described
Two switching tubes are switched to off state by conducting state, and the 6th switching tube is switched to conducting state by off state.
7. control device as claimed in claim 5, which is characterized in that the modulated signal is in the zero crossing time interval
Become just by negative, in the zero crossing time interval, the configuration of the control signal makes：The third switching tube (103) by
Conducting state is switched to off state, and the 5th switching tube (105) is switched to conducting state by off state；And described
Two switching tubes (102) are switched to conducting state by off state, and the 6th switching tube (106) is switched to shutdown by conducting state
State.
8. the control device as described in any one of claim 5-7, which is characterized in that the modulated signal is sinusoidal signal.
9. a kind of control system of three-level inverter, which is characterized in that including：Three-level inverter and control device, it is described
Three-level inverter includes bleeder circuit (20) and switch transformed circuit (10), and the bleeder circuit (20) is being configured as output just
Level, negative level and zero level；The switch transformed circuit (10) include six switching tubes (101,102,103,104,105,
106) positive level that, wherein first switch pipe (101) is exported to the 4th switching tube (104) in the bleeder circuit (20) with
Be serially connected between the negative level, the second end of second switch pipe (102), the first end of third switching tube (103) with it is described
Zero level is connected, and the 5th switching tube (105) is serially connected with the 6th switching tube (106), and the 5th switching tube (105)
First end be connected with the first end of the second switch pipe (102), the second end of the 6th switching tube (106) and described the
The second ends of three switching tubes (103) is connected, the second end of the 5th switching tube (105), the 6th switching tube (106) the
One end is connected with the output end of the switch transformed circuit (10), the control device and the switch transformed circuit (10) phase
Even, the control device is the control device as described in any one of claim 5- power 8.
10. a kind of electrical equipment, which is characterized in that include the control device as described in any one of claim 5-8.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327154A (en) * | 2018-11-15 | 2019-02-12 | 阳光电源股份有限公司 | ANPC type three-level inverter and its modulator approach |
| CN113872460A (en) * | 2021-11-05 | 2021-12-31 | 阳光电源股份有限公司 | Switching modulation method for inverter and ANPC type three-level inverter circuit |
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| CN113872460A (en) * | 2021-11-05 | 2021-12-31 | 阳光电源股份有限公司 | Switching modulation method for inverter and ANPC type three-level inverter circuit |
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