CN108599604A - The single-phase seven level inverse conversions electric appliance of one kind and its pwm signal modulator approach - Google Patents
The single-phase seven level inverse conversions electric appliance of one kind and its pwm signal modulator approach Download PDFInfo
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- CN108599604A CN108599604A CN201810356085.5A CN201810356085A CN108599604A CN 108599604 A CN108599604 A CN 108599604A CN 201810356085 A CN201810356085 A CN 201810356085A CN 108599604 A CN108599604 A CN 108599604A
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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
The invention discloses a kind of single-phase seven electrical level inverter and its modulator approaches, the circuit includes switched-capacitor circuit and H-bridge circuit, switched-capacitor circuit is made of three power switch tubes, three diodes and two capacitances, the different Switch State Combination in Power Systems of three switching tubes, allow the circuit to export 0.5V respectively in control circuitdc、VdcAnd 1.5VdcThree kinds of different level, and there are serial connection charge or parallel discharge both of which, the inverter circuit can export 1.5V in total under the different working conditions of circuit for two capacitancesdc、‑Vdc、0.5Vdc、0V、0.5Vdc、Vdc、1.5VdcSeven kinds of level, solve the problems, such as capacitor voltage equalizing existing for existing multi-level inverter circuit, and reduce the number of switching tube.
Description
Technical field
The invention belongs to power electronic technique application fields, and in particular to a kind of single-phase seven electrical level inverter and described inverse
Become the pwm signal modulator approach of device.
Background technology
With the fast development of the regenerative resources such as wind energy, solar energy, water energy, biomass energy, tide energy and geothermal energy,
Make full use of such energy that can increase energy supply and reduce environmental pollution.The utilization of regenerative resource is mainly used now and is divided
Cloth is generated electricity by way of merging two or more grid systems technology, and key technology is to use rational inverter topology and Grid-connected Control Strategy, to obtain
Obtain the grid-connected current of stable grid-connected system and high quality.
Compared to traditional two-level inverter, multi-electrical level inverter is small with harmonic wave of output voltage, electromagnetic interference is small and can
The advantages that using filters of small size.Earliest multi-electrical level inverter is the three level midpoints pincers proposed by Japanese scholars in 1980
Position inverter, by development in more than 30 years, many scholars proposed multi-level inverter circuit with practical significance and more in succession
The modulation control method of kind multi-electrical level inverter.The primary structure of current multi-electrical level inverter have diode-clamped, fly across
Capacitive and H bridge cascade connection types.Wherein diode-clamped circuit needs to ensure that DC bus capacitor is pressed, and it is complicated which increase controls
Degree, striding capacitance type equally exists capacitance voltage Balance route and Redundanter schalter state optimization problem, and H bridge cascade connection types then need
Want the independent DC power supply of multichannel.In addition, these three type multi-level inverter circuits are needed with the increase of output level number
Power switch tube and capacitance number increase rapidly, and system bulk will become huge, and cost will also become unacceptable.This is violated
High efficiency, high power density, the target of low cost of power electronic equipment requirement, it is therefore desirable to propose that a kind of new more level are inverse
Become circuit to generate electricity by way of merging two or more grid systems requirement to meet regenerative resource.
Invention content
The object of the present invention is to provide a kind of single-phase seven electrical level inverter and its PWM methods, solve existing more level
Capacitor voltage equalizing problem existing for inverter circuit, and reduce the number of switching tube.
The present invention provides a kind of single-phase seven level inverter circuit, and single-phase seven level inverter circuit includes switching capacity electricity
Road and H-bridge circuit；
The switched-capacitor circuit includes：DC power supply Vdc, switching tube S5、S6、S7, diode D1、D2、D3、D4, Yi Ji electricity
Hold C1、C2；DC power supply VdcAnode with switching tube S5Output end and S6Input terminal connection, and VdcCathode and switch
Pipe S7Output end connection, S6Output end and S7Input terminal be connected；With S7Input terminal be connected with diode D3Anode
With capacitance C2Cathode, and C2Anode with diode D1Cathode, diode D2Anode be connected, capacitance C1Cathode connection
D3Cathode and D1Anode；Switching tube S5Output end and diode D4Anode be connected, D4Cathode then with C1Anode
And D2Cathode be connected.
The H-bridge circuit includes：The output port of the positive and negative busbar connecting valve condenser network of H-bridge circuit, H-bridge circuit
Output passes through filter inductance L connections load or power grid.
The characteristics of program, also resides in：
The power switch of the switched-capacitor circuit and the power switch of H-bridge circuit are that IGBT or MOSFET control power entirely
Device.
The diode D1、D2、D3、D4It is silicon carbide diode or fast recovery diode or Ultrafast recovery diode.
The capacitance C1、C2It is the consistent electrolytic capacitor of parameter.
Eight kinds of operating mode control modes of single-phase seven level inverter circuit are：
Operating mode 1 controls the switching tube S1、S4And S6Conducting, switching tube S2、S3、S5And S7Shutdown；
Operating mode 2 controls the switching tube S1、S4、S5And S7Conducting, switching tube S2、S3、S6Shutdown；
Operating mode 3 controls the switching tube S1、S4Conducting, switching tube S2、S3、S5、S6、S7Shutdown；
Operating mode 4, control switching tube S4、S5、S7Conducting, switching tube S1、S2、S3、S6Shutdown；
Operating mode 5 controls the switching tube S2、S5、S7Conducting, switching tube S1、S3、S4、S6, shutdown；
Operating mode 6 controls the switching tube S2、S3Conducting, switching tube S1、S4、S5、S6、S7Shutdown；
Operating mode 7 controls the switching tube S2、S3、S5And S7Conducting, switching tube S1、S4、S6Shutdown；
Operating mode 8 controls the switching tube S2、S3And S6Conducting, switching tube S1、S4、S5And S7Shutdown.
According to said program, single-phase seven level inverter circuit of the invention includes switched-capacitor circuit and H-bridge circuit two
Point, wherein switched-capacitor circuit is the key component that inverter circuit of the present invention realizes more level outputs.The switched-capacitor circuit by
Three power switch tubes, three diodes and two capacitances are constituted, according to the different on off states of three switching tubes in circuit
Combination, the circuit can export 0.5V respectivelydc、VdcAnd 1.5VdcThree kinds of different level, and two capacitances circuit not
There are serial connection charge or parallel discharge both of which under same working condition, and it is owned automatically equal that this also allows for capacitance
The ability of pressure, also the constant half for supply voltage, switched-capacitor circuit output port connect the positive and negative mother of H bridges to capacitance voltage
Line, when H-bridge circuit works in unipolarity, then inverter circuit can export -1.5V in totaldc、-Vdc、0.5Vdc、0V、0.5Vdc、
Vdc、1.5VdcSeven kinds of level.
Another technical solution of the present invention is that the modulator approach of above-mentioned single-phase seven electrical level inverters pwm signal passes through tune
The amplitude for saving sinusoidal modulation wave signal M controls inverter operating mode, when 0<M<When 1, inverter exports three level modes；When 1<
M<When 2, inverter exports five level modes；When 2<M<When 3, inverter exports seven level modes；
Sinusoidal modulation wave signal M, which take absolute value, obtains signal K, signal K and carrier wave v after processing3By comparing device 4 into
Row relatively obtains output signal H, when signal K is more than or equal to carrier wave v3When, the output signal H of comparator 4 is 1, conversely, output letter
Number H is 0, and output signal H is as switching tube S6Pwm control signal；Signal K and carrier wave v2It is compared by comparing device 3
To output signal I, when signal K is more than or equal to carrier wave v2When, the output signal I of comparator 3 is 1, conversely, output signal I is 0,
Output signal I and signal H is by obtaining signal P after XOR gate；Signal K and carrier wave v1It is compared to obtain by comparing device 2
Output signal G, when signal K is more than or equal to carrier wave v1When, the output signal G of comparator 2 is 1, conversely, output signal G is 0, it should
Output signal G by it is non-obtain behind the door signal N, signal N and signal P by or be used as switching tube S behind the door5Pwm control signal,
And switching tube S7Pwm control signal and S5Pwm control signal synchronize；Sinusoidal modulation wave signal M and 0 is carried out by comparing device 1
Compare to obtain output signal E, signal E and signal G by with obtain output signal behind the door and be used as switching tube S1PWM control letter
Number；Signal E by it is non-obtain behind the door signal F, signal F and signal G by with obtain output signal behind the door and be used as switching tube S3's
Pwm control signal；Signal F is as switching tube S2Pwm control signal, signal E is as switching tube S4Pwm control signal.
Single-phase seven level inverter circuit of the present invention has the advantages that：
(1) the inverter circuit number of switches is few, and hardware cost is low；Increase by one by three work(in H-bridge inverter circuit prime
The switched-capacitor circuit that rate switching tube, three diodes and two capacitances are constituted, you can obtain seven level inverter circuits.
(2) voltage itself of two capacitances in the inverter circuit is pressed, and simplifies control algolithm, while it both can be with work
Make, in active inversion pattern, passive inverter pattern can also be operated in.
(3) compared with traditional multi-level inverter circuit, which can reach 1.5 times
Direct current power source voltage so that the input range of voltage broadens.
Description of the drawings
Fig. 1 is the circuit diagram of single-phase seven electrical level inverter of the present invention；
Fig. 2 (a)~(h) is eight kinds of different operating modes of single-phase seven electrical level inverter of the present invention；
Fig. 3 is single-phase seven circuit inverter in different moments corresponding output voltage variation diagram；
Fig. 4 is that logic circuit schematic diagram occurs for the single-phase seven electrical level inverters modulated drive signal of the present invention；
Fig. 5 is the waveform diagram of the single-phase seven electrical level inverters modulated drive signal of the present invention；
Fig. 6 is the example output voltage waveforms schematic diagram of single-phase seven electrical level inverter of the present invention.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to
These embodiments.
Fig. 1 is the circuit diagram of single-phase seven electrical level inverter of the present invention, is described in detail below：
The circuit of the inverter includes：DC power supply, switched-capacitor circuit, H-bridge circuit, filter inductance L and exchange connect
Inbound port；
The switched-capacitor circuit includes：Switching tube S5、S6、S7, diode D1、D2、D3、D4And capacitance C1、C2；Direct current
Power supply VdcAnode with switching tube S5Output end and S6Input terminal connection, and VdcCathode and switching tube S7Output end
Connection, S6Output end and S7Input terminal be connected；With S7Input terminal be connected be connected to diode D3Anode and capacitance C2's
Cathode, and C2Anode with diode D1Cathode, diode D2Anode be connected, capacitance C1Cathode connect D3Cathode and
D1Anode；Switching tube S5Output end and diode D4Anode be connected, D4Cathode then with C1Anode and D2The moon
Pole is connected.
H-bridge circuit includes four power switch tube Ss1、S2、S3、S4, the S of switching tube in H-bridge circuit1、S3Input terminal with open
D in powered-down capacitive circuit2Cathode be connected, the S of switching tube2、S4Output end and VdcCathode and switching tube S7Output end
Connection；Power switch tube S1Output end, power switch tube S2Input terminal be connected to one end of filter inductance, filter inductance
The other end connects AC port, power switch tube S3Output end, power switch tube S4Input terminal connect AC port.
It is to be appreciated that switching tube can be MOS transistor or technotron (MOSFET) or insulated gate
Bipolar transistor (IGBT)；When the switching tube is MOS transistor, the input terminal of the switching tube is source
The output end of pole, the switching tube is drain electrode, and the control terminal is grid；When the switching tube is that insulated gate bipolar is brilliant
When body pipe, the input terminal of the switching tube is collector, and the output end of the switching tube is emitter, and the control terminal is
Base stage.It can be understood that above eight switching tubes can also select other kinds of switching tube.It also needs to illustrate, two pole
Pipe can be silicon carbide diode or fast recovery diode, or be Ultrafast recovery diode.It can be understood that described
Diode can also select other kinds of diode.In an embodiment of the present invention, seven level inverter circuit institute of New single-phase
Including L filter circuits can also be LC filters LCL filter or other filters.
Seven level inverter circuit of the present invention can be operated in seven level output modes, five level output modes and three electricity
Flat output mode, seven level output modes are the main points of the present invention, therefore only describe seven level active patterns corresponding eight herein
A circuit mode is as follows：
First circuit mode controls the switching tube S1、S4And S6Conducting, switching tube S2、S3、S5And S7Shutdown, at this time
It is positive flow direction that arrow, which is electric current, shown in circuit working state such as Fig. 2 (a), in figure.Diode D1Cut-off, D2And D3Conducting,
Capacitance C1With C2In parallel connection, terminal voltage in parallel is the half of direct current power source voltage, and DC power supply passes through switching tube S6With
Capacitance C1、C2Series connection；So that the inverter circuit output voltage is 1.5Vdc。
Second circuit mode controls the switching tube S1、S4、S5And S7Conducting, switching tube S2、S3、S6Shutdown, it is electric at this time
It is positive flow direction that arrow, which is electric current, shown in road working condition such as Fig. 2 (b), in figure.Diode D1Conducting, D2And D3Cut-off, electricity
Hold C1With C2In series connection, series connection terminal voltage is direct current power source voltage, and DC power supply passes through switching tube S5With capacitance C1、C2
It is in parallel；So that the inverter circuit output voltage is Vdc。
Tertiary circuit mode controls the switching tube S1、S4Conducting, switching tube S2、S3、S5、S6、S7Shutdown, it is electric at this time
It is positive flow direction that arrow, which is electric current, shown in road working condition such as Fig. 2 (c), in figure.Diode D1Cut-off, D2And D3Conducting, electricity
Hold C1With C2In parallel connection, terminal voltage in parallel is the half of direct current power source voltage；Make the inverter circuit output voltage
For 0.5Vdc。
4th circuit mode controls the switching tube S4、S5、S7Conducting, switching tube S1、S2、S3And S6Shutdown, it is electric at this time
It is positive flow direction that arrow, which is electric current, shown in road working condition such as Fig. 2 (d), in figure.Diode D1Conducting, D2And D3Cut-off, electricity
Hold C1With C2In series connection, series connection terminal voltage is direct current power source voltage；The inverter circuit output voltage is 0V.
5th circuit mode controls the switching tube S2、S5、S7Conducting, switching tube S1、S3、S4And S6Shutdown, it is electric at this time
It is positive flow direction that arrow, which is electric current, shown in road working condition such as Fig. 2 (e), in figure.Diode D1Conducting, D2And D3Cut-off, electricity
Hold C1With C2In series connection, series connection terminal voltage is direct current power source voltage；The inverter circuit output voltage is 0V.
6th circuit mode controls the switching tube S2、S3Conducting, switching tube S1、S4、S5、S6、S7Shutdown, it is electric at this time
It is positive flow direction that arrow, which is electric current, shown in road working condition such as Fig. 2 (f), in figure.Diode D1Cut-off, D2And D3Conducting, electricity
Hold C1With C2In parallel connection, terminal voltage in parallel is the half of direct current power source voltage；Make the inverter circuit output voltage
For -0.5Vdc。
7th circuit mode controls the switching tube S2、S3、S5And S7Conducting, switching tube S1、S4、S6Shutdown, it is electric at this time
It is positive flow direction that arrow, which is electric current, shown in road working condition such as Fig. 2 (g), in figure.Diode D1Conducting, D2And D3Cut-off, electricity
Hold C1With C2In series connection, series connection terminal voltage is direct current power source voltage, and DC power supply passes through switching tube S5With capacitance C1、C2
It is in parallel；So that the inverter circuit output voltage is-Vdc。
8th circuit mode controls the switching tube S2、S3And S6Conducting, switching tube S1、S4、S5And S7Shutdown, at this time
It is positive flow direction that arrow, which is electric current, shown in circuit working state such as Fig. 2 (h), in figure.Diode D1Cut-off, D2And D3Conducting,
Capacitance C1With C2In parallel connection, terminal voltage in parallel is the half of direct current power source voltage, and DC power supply passes through switching tube S6With
Capacitance C1、C2Series connection；So that the inverter circuit output voltage is -1.5Vdc。
As shown in figure 3, the figure is the corresponding output voltage variation diagram of different moments single-phase seven electrical level inverter.In an electricity
In net voltage cycle, in different times in section, inverter is operated in different mode, and output voltage is with inverter work
Make the transformation of mode and changes：
t0-t1Single-phase seven electrical level inverter exports 0 level or 0.5V in perioddcLevel, when exporting 0 level
When, inverter is operated in the 4th circuit mode；As output 0.5VdcWhen level, inverter is operated in tertiary circuit mode.
t1-t2Single-phase seven electrical level inverter exports 0.5V in perioddcLevel or VdcLevel, as output 0.5Vdc
When level, inverter is operated in tertiary circuit mode, as output VdcWhen level, inverter is operated in second circuit mode.
t2-t3Single-phase seven electrical level inverter exports V in perioddcLevel or 1.5VdcLevel, as output VdcLevel
When, inverter is operated in second circuit mode, as output 1.5VdcWhen level, inverter is operated in the first circuit mode.
Inverter is operated in t3-t4When the period, residing working condition and t1-t2Period is similar, is operated in t4-t54
When the period, residing working condition and t0-t1Period is similar, and details are not described herein.
t5-t6Single-phase seven electrical level inverter exports 0 level or -0.5V in perioddcLevel, when exporting 0 level
When, inverter is operated in the 5th circuit mode, as output -0.5VdcWhen level, inverter is operated in the 6th circuit mode.
t6-t7The single-phase seven electrical level inverters output -0.5V in perioddcLevel or-VdcLevel, when output-
0.5VdcWhen level, inverter is operated in the 6th circuit mode, as output-VdcWhen level, inverter is operated in the 7th circuit mould
State.
t7-t8The single-phase seven electrical level inverters output-V in perioddcLevel or -1.5VdcLevel, as output-Vdc
When level, inverter is operated in the 7th circuit mode, as output -1.5VdcWhen level, inverter is operated in the 8th circuit mode.
Inverter is operated in t8-t9When the period, residing working condition and t6-t7Period is similar, is operated in t9-t10
When the period, residing working condition and t5-t6Period is similar, and details are not described herein.
Corresponding above-mentioned single-phase three-level inverter circuit working condition, S1、S2、S3、S4、S5、S6And S7The arteries and veins of power switch
Width modulated (PWM) signal generating method is rushed as shown in figure 4, being described as follows：
Sinusoidal modulation wave signal M is the sinusoidal signal (such as 50Hz) of power frequency, carrier wave v1、v2、v3It is identical high frequency
Triangular carrier, frequency is power switch working frequency, such as selects its frequency in 10kHz~20kHz ranges.Carrier wave v1、
v2、v3It is to stack gradually from low to high.
The amplitude of sinusoidal modulation wave signal M determines that inverter is operated in several level modes in different range, i.e., when 0<M<1
When, inverter exports three level modes；When 1<M<When 2, inverter exports five level modes；When 2<M<When 3, inverter output seven
Level mode.Sinusoidal modulation wave signal M, which take absolute value, obtains signal K, signal K and carrier wave v after processing3By comparing device 4
It is compared to obtain output signal H, when signal K is more than or equal to carrier wave v3When, the output signal H of comparator 4 is 1, conversely, output
Signal H is 0, and output signal H is as switching tube S6Pwm control signal；Signal K and carrier wave v2It is compared by comparing device 3
Output signal I is obtained, when signal K is more than or equal to carrier wave v2When, the output signal I of comparator 3 is 1, conversely, output signal I is
0, output signal I are with signal H by obtaining signal P after XOR gate；Signal K and carrier wave v1It is compared by comparing device 2
To output signal G, when signal K is more than or equal to carrier wave v1When, the output signal G of comparator 2 is 1, conversely, output signal G is 0,
Output signal G by it is non-obtain behind the door signal N, signal N and signal P by or be used as switching tube S behind the door5PWM control letter
Number, and switching tube S7Pwm control signal and S5Pwm control signal synchronize；Sinusoidal modulation wave signal M and 0 is by comparing device 1
Be compared to obtain output signal E, signal E and signal G by with obtain output signal behind the door and be used as switching tube S1PWM control
Signal；Signal E by it is non-obtain behind the door signal F, signal F and signal G by with obtain output signal behind the door and be used as switching tube S3
Pwm control signal；Signal F is as switching tube S2Pwm control signal, signal E is as switching tube S4Pwm control signal.
The waveform of the pwm control signal of each switching tube obtained according to above-mentioned modulator approach is as shown in Figure 5.Fig. 6 is upper
The example output voltage waveform for stating single-phase seven electrical level inverter, with modulation wave amplitude variation, the example of seven electrical level inverters
Output voltage becomes five level again to three level from seven level.The inverter of the present invention has only used capacitance C1And C2, reduce electricity
The quantity of appearance, and due to circuit work characteristics, capacitance voltage can be realized in each switch periods and once be pressed, it ensure that
Two capacitance voltages can keep almost consistent voltage value, reduce the complexity of inverter, improve the reliable of inverter
Property.The diode clamp bit-type inverter of seven level of same output needs 12 switching tubes, 6 diodes and three capacitances, defeated
The striding capacitance type inverter for going out seven level needs 12 switching tubes and 6 capacitances, and circuit of the present invention only needs 7 switches
Pipe, 4 diodes and 2 capacitances, can substantially reduce system bulk, reduce cost.
Claims (6)
1. a kind of single-phase seven electrical level inverter, which is characterized in that including：DC power supply, switched-capacitor circuit, H-bridge circuit and
Filter inductance L；
The switched-capacitor circuit includes three power switch tube Ss5、S6、S7, four diode D1、D2、D3、D4With two capacitances
C1、C2；The DC power supply VdcAnode with switching tube S5Output end and S6Input terminal connection, VdcCathode and switch
Pipe S7Emitter connection, S6Output end and S7Collector be connected；S7Input terminal be connected with diode D3Anode and
Capacitance C2Cathode, C2Anode with diode D1Cathode, diode D2Anode be connected, capacitance C1Cathode connect D3's
Cathode and D1Anode；Switching tube S5Output end and diode D4Anode be connected, D4Cathode and C1Anode and D2
Cathode be connected；
The positive and negative busbar of the H-bridge circuit connects the switched-capacitor circuit output port, and the output of H-bridge circuit passes through the filter
Wave inductance L connects load or power grid.
2. single-phase seven electrical level inverter according to claim 1, which is characterized in that the power of the switched-capacitor circuit is opened
It closes and the power switch of H-bridge circuit is that IGBT or MOSFET control power device entirely.
3. single-phase seven electrical level inverter according to claim 1, which is characterized in that the diode D1、D2、D3、D4It is
Silicon carbide diode or fast recovery diode or Ultrafast recovery diode.
4. single-phase seven electrical level inverter according to claim 1, which is characterized in that the capacitance C1、C2It is that parameter is consistent
Electrolytic capacitor.
5. single-phase seven electrical level inverter according to any one of claims 1-4, which is characterized in that single-phase seven level
Eight kinds of operating mode control modes of inverter circuit are：
Operating mode 1 controls the switching tube S1、S4And S6Conducting, switching tube S2、S3、S5And S7Shutdown；
Operating mode 2 controls the switching tube S1、S4、S5And S7Conducting, switching tube S2、S3、S6Shutdown；
Operating mode 3 controls the switching tube S1、S4Conducting, switching tube S2、S3、S5、S6、S7Shutdown；
Operating mode 4, control switching tube S4、S5、S7Conducting, switching tube S1、S2、S3、S6Shutdown；
Operating mode 5 controls the switching tube S2、S5、S7Conducting, switching tube S1、S3、S4、S6, shutdown；
Operating mode 6 controls the switching tube S2、S3Conducting, switching tube S1、S4、S5、S6、S7Shutdown；
Operating mode 7 controls the switching tube S2、S3、S5And S7Conducting, switching tube S1、S4、S6Shutdown；
Operating mode 8 controls the switching tube S2、S3And S6Conducting, switching tube S1、S4、S5And S7Shutdown.
6. the modulator approach of single-phase seven electrical level inverters pwm signal, feature exist according to any one of claims 1-4
In the amplitude by adjusting sinusoidal modulation wave signal M controls inverter operating mode, when 0<M<When 1, inverter exports three level
Pattern；When 1<M<When 2, inverter exports five level modes；When 2<M<When 3, inverter exports seven level modes；
Sinusoidal modulation wave signal M, which take absolute value, obtains signal K, signal K and carrier wave v after processing3Compared by comparing device 4
Output signal H is relatively obtained, when signal K is more than or equal to carrier wave v3When, the output signal H of comparator 4 is 1, conversely, output signal H
It is 0, output signal H is as switching tube S6Pwm control signal；Signal K and carrier wave v2It is compared to obtain by comparing device 3
Output signal I, when signal K is more than or equal to carrier wave v2When, the output signal I of comparator 3 is 1, conversely, output signal I is 0, it should
Output signal I and signal H is by obtaining signal P after XOR gate；Signal K and carrier wave v1It is compared to obtain by comparing device 2 defeated
Go out signal G, when signal K is more than or equal to carrier wave v1When, the output signal G of comparator 2 is 1, conversely, output signal G is 0, this is defeated
Go out signal G by it is non-obtain behind the door signal N, signal N and signal P by or be used as switching tube S behind the door5Pwm control signal, and
Switching tube S7Pwm control signal and S5Pwm control signal synchronize；Sinusoidal modulation wave signal M is compared with 0 by comparing device 1
Relatively obtain output signal E, signal E and signal G by with obtain output signal behind the door and be used as switching tube S1Pwm control signal；
Signal E by it is non-obtain behind the door signal F, signal F and signal G by with obtain output signal behind the door and be used as switching tube S3PWM
Control signal；Signal F is as switching tube S2Pwm control signal, signal E is as switching tube S4Pwm control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810356085.5A CN108599604B (en) | 2018-04-19 | 2018-04-19 | Single-phase seven-level inverter and PWM signal modulation method thereof |
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| CN201810356085.5A CN108599604B (en) | 2018-04-19 | 2018-04-19 | Single-phase seven-level inverter and PWM signal modulation method thereof |
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| Publication Number | Publication Date |
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| CN108599604A true CN108599604A (en) | 2018-09-28 |
| CN108599604B CN108599604B (en) | 2020-08-18 |
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| CN201810356085.5A Active CN108599604B (en) | 2018-04-19 | 2018-04-19 | Single-phase seven-level inverter and PWM signal modulation method thereof |
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| CN115864833A (en) * | 2022-12-09 | 2023-03-28 | 广东工业大学 | Embedded multi-level reconfigurable switched capacitor converter |
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