CN104506063A - Few-switch five-level inverter and modulation method thereof - Google Patents
Few-switch five-level inverter and modulation method thereof Download PDFInfo
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- CN104506063A CN104506063A CN201310734503.7A CN201310734503A CN104506063A CN 104506063 A CN104506063 A CN 104506063A CN 201310734503 A CN201310734503 A CN 201310734503A CN 104506063 A CN104506063 A CN 104506063A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a few-switch five-level inverter and a modulation method thereof. The inverter comprises a load, an electric reactor, a power switch circuit, a first AC power module, and a second AC power module. The load is provided with an a end and a b end. The power switch circuit comprises eight power switches. Both of the first AC power module and the second AC power module are provided with a forward end and a negative end. One end of the electric reactor is connected with the a end of the load, and the other end of the electric reactor and the b end of the load are respectively electrically connected with the power switch circuit. The inverter controls responsive power switch to operate according to different data obtained by comparing the amplitude, phase, and frequency of a modulating wave and a carrier wave. The inverter has little switching stress, and is more stable in operation, low in power consumption, high in efficiency, and less in AC output voltage thin content, and output current can be approximately regarded as ideal current without harmonic waves. The inverter can be applied in precision measurement, communication, precision machine tools and medical equipment and other apparatuses and equipment which have high requirements on network voltage.
Description
Technical field
The present invention relates to inverter technology field, refer in particular to a kind of less-switch five-power level inverter and modulator approach thereof.
Background technology
Power electronic technology is as a novel professional technique, and obtaining swift and violent development in recent years, its range of application also constantly expands, now together with information technology as the important support field of the national economic development.The mainly Semiconductor Converting Technology of power electronic technology research, Semiconductor Converting Technology to have also been obtained the concern of numerous scholars in recent years as the key technology of new forms of energy.This technology the electric energy of other energy conversions such as storage battery, solar cell and fuel cell thereof can be converted to AC energy and and grid network, realize the grid-connected of energy.Therefore inversion transformation technique just becomes the key technology of new forms of energy, has and important effect at the development field of new forms of energy.Usually call inverter circuit by the circuit of converting direct-current power into alternating-current power, consider control system etc., be referred to as inverter.Inversion transformation technique is a subject of research Circuit theory and methods for using them, and this subject is based upon a practical technique on the basis of the subjects such as industrial electronic technology, semiconductor device art, control technology, power electronic technology, Semiconductor Converting Technology, pulse modulation technique, magnetic material science and technology.
Mostly the main circuit of present many inverters is to adopt traditional H-bridge circuit structure.Utilize rectifier circuit that convert alternating current is become direct current, adopt DC capacitor to support direct voltage in DC side.AC adopts multiple device for power switching and anti-paralleled diode, according to the voltage and current waveform of certain modulation strategy output AC side.This circuit mechanism is simple, dependable performance.But the total harmonic distortion factor of this circuit is higher, the characteristic harmonics in waveform is comparatively obvious, and needs larger filter reactance.In order to improve output current wave, adopt the circuit mechanism improved: one is multiple inverter configuration, this method, by multiple inverter cooperating, utilizes the multiplex of main circuit to reduce the harmonic content of output voltage.The method distinct disadvantage is that circuit structure is too complicated, and efficiency is lower.Another kind method studies novel circuit structure, reduces total harmonic distortion by the output level of side of increasing exchanges.Typically there are diode clamp type multi-electrical level inverter, capacitor pincers bit-type multi-electrical level inverter, cascade multilevel inverter etc.But for special application scenario, these structures still seem too complicated, and efficiency is lower, and brings difficulty to Control System Design.
Summary of the invention
In order to solve existing inverter circuit complex structure, problem that efficiency is lower, the present invention proposes a kind of less-switch five-power level inverter and modulator approach thereof, under single-phase applicable cases, power switch is less, control strategy is simpler, efficiency is higher, the thin content of ac output voltage is less, output current can be similar to the ideal current thought without harmonic wave, can be applied to instrument, equipment etc. that accurate measurement, communication, precision machine tool and Medical Devices etc. are higher to line voltage requirement.
The technical solution adopted in the present invention is: a kind of less-switch five-power level inverter, comprises load, reactor, power switch circuit, first AC power supply module, second AC power supply module and control signal generator, described load is provided with a end and b end, and described power switch circuit comprises power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5 and power switch Q6, the first described AC power supply module and the second AC power supply module all have forward end and negative end, and one end of described reactor connects a end of load, the other end of reactor and the emitter of power switch Q1, the collector electrode electrical connection of power switch Q4, the b end of load and the emitter of power switch Q2, the collector electrode electrical connection of power switch Q3, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the emitter of power switch Q5, the emitter electrical connection of power switch Q6, the emitter of power switch Q3, the emitter electrical connection of power switch Q4, the forward end of the first AC power supply module is electrically connected with the collector electrode of power switch Q5, the negative end of the first AC power supply module, the forward end of the second AC power supply module is electrically connected with the collector electrode of power switch Q6 respectively, and the negative end of the second AC power supply module is electrically connected with the emitter of power switch Q3, power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5 and power switch Q6 is electrically connected with control signal generator respectively.
The present invention can export five different level combinations, power switch is few, it is simple, stable to control, power switch Q1 and power switch Q4, power switch Q2 and power switch Q3, power switch Q5 and power switch Q6, be the power switch of three groups of complementations, during a power switch conducting often in group, another power switch then disconnects, and stays a power switch to control by adopting suitable PWM.The thin content of ac output voltage of the present invention is less, and output current can be similar to the ideal current thought without harmonic wave.
As preferably, described reactor is smoothing reactor.Smoothing reactor is used for connecting power switch circuit and AC network.
As preferably, described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6 are IGBT.
Preferred as another, described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6 are MOSFET.MOSFET element is suitable for small-power occasion.
As preferably, the first described AC power supply module and the second AC power supply module include AC power, rectifier bridge and DC capacitor, and two inputs of rectifier bridge connect AC power, and DC capacitor two ends connect two outputs of rectifier bridge respectively.
As preferably, described control signal generator comprise modulating wave generation module, Zero-cross comparator module, fixed value comparison module, first carrier comparison module, the second carrier wave comparison module and gate-controlled switch, described Zero-cross comparator module, fixed value comparison module, first carrier comparison module, the second carrier wave comparison module respectively with modulating wave generation model calling, gate-controlled switch is connected respectively with Zero-cross comparator module, fixed value comparison module, first carrier comparison module, and gate-controlled switch has the first output and the second output.
For a modulator approach for described less-switch five-power level inverter, comprise the steps:
(1) modulating wave generation module produces modulating wave Ma and carrier wave tr0, carrier wave tr1, and modulating wave Ma is sinusoidal wave, and carrier wave tr0 is the triangular wave changed between 0 to N, and carrier wave tr1 is the triangular wave changed between N to 2N, and N is the maximum of carrier wave tr0 data;
(2) data of modulating wave and 0 compare by Zero-cross comparator module, if the data of modulating wave are greater than 0, the output valve of Zero-cross comparator module is 1, if the data of modulating wave are less than or equal to 0, the output valve of Zero-cross comparator module is 0, the output valve of Zero-cross comparator module is as the control signal of power switch Q1 and gate-controlled switch, and the inverted value of the output valve of Zero-cross comparator module is as the control signal of power switch Q4;
(3) data of the absolute value of modulating wave data and carrier wave tr0 compare by first carrier comparison module, if the absolute value of modulating wave data is greater than the data of carrier wave tr0, the output valve of first carrier comparison module is 1, if the absolute value of modulating wave data is less than or equal to the data of carrier wave tr0, the output valve of first carrier comparison module is 0;
(4) absolute value of modulating wave data and fixed value N compare by fixed value comparison module, if the absolute value of modulating wave data is greater than fixed value N, the output valve of fixed value comparison module is 1, if the absolute value of modulating wave data is less than or equal to fixed value N, the output valve of fixed value comparison module is 0;
The data of the absolute value of modulating wave data and carrier wave tr1 compare by (5) second carrier wave comparison modules, if the absolute value of modulating wave data is greater than the data of carrier wave tr1, the output valve of the second carrier wave comparison module is 1, if the absolute value of modulating wave data is less than or equal to the data of carrier wave tr1, the output valve of the second carrier wave comparison module is 0;
(6) inverted value of the output valve of fixed value comparison module that the output valve of first carrier comparison module that obtains of step (3) and step (4) obtain is carried out logic and operation and is obtained the first logical AND value, if the output valve of Zero-cross comparator module is the 0, first logical AND value output to the first output of gate-controlled switch and the first logical AND value as the control signal of power switch Q3, the inverted value of the first logical AND value is as the control signal of power switch Q2, if the output valve of Zero-cross comparator module is the 1, first logical AND value output to the second output of gate-controlled switch and the first logical AND value as the control signal of power switch Q2, the inverted value of the first logical AND value is as the control signal of power switch Q3,
(7) output valve of the second carrier wave comparison module that the output valve of fixed value comparison module that obtains of step (4) and step (5) obtain is carried out logic and operation and is obtained the second logical AND value, the second logical AND value as the control signal of power switch Q5, the inverted value of the second logical AND value as the control signal of power switch Q6.
The invention has the beneficial effects as follows: switch stress is less, work is more stable, power loss is little, efficiency is higher, the thin content of ac output voltage is less, output current can be similar to the ideal current thought without harmonic wave, can be applied to instrument, equipment etc. that accurate measurement, communication, precision machine tool and Medical Devices etc. are higher to line voltage requirement.
Accompanying drawing explanation
Fig. 1 is a kind of circuit structure diagram of the present invention;
Fig. 2 is a kind of modulating wave of the present invention and carrier wave schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, a kind of less-switch five-power level inverter, comprise load J1, reactor L1, power switch circuit and the first AC power supply module, the second AC power supply module, first AC power supply module and the second AC power supply module all have forward end and negative end, load J1 is inductive load or the resistive load with a end and b end, power switch circuit comprises power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5 and power switch Q6, reactor L1 is smoothing reactor, is used for connecting power switch circuit and load.
One end of reactor L1 connects a end of load J1, the other end of reactor L1 and the emitter of power switch Q1, the collector electrode electrical connection of power switch Q4, the b end of load J1 and the emitter of power switch Q2, the collector electrode electrical connection of power switch Q3, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the emitter of power switch Q5, the emitter electrical connection of power switch Q6, the emitter of power switch Q3, the emitter electrical connection of power switch Q4, the forward end of the first AC power supply module is electrically connected with the collector electrode of power switch Q5, the negative end of the first AC power supply module, the forward end of the second AC power supply module is electrically connected with the collector electrode of power switch Q6 respectively, the negative end of the second AC power supply module is electrically connected with the emitter of power switch Q3, power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5 and power switch Q6 is electrically connected with control signal generator respectively.
First AC power supply module is made up of AC power U1, rectifier bridge T1 and DC capacitor C1, rectifier bridge T1 is made up of diode D1, diode D2, diode D3 and diode D4, two inputs of rectifier bridge T1 connect AC power U1, DC capacitor C1 two ends connect two outputs of rectifier bridge T1 respectively, and the two ends up and down of DC capacitor C1 are respectively the forward end of the first AC power supply module and the negative end of the first AC power supply module; Second AC power supply module is made up of AC power U2, rectifier bridge T2 and DC capacitor C2, rectifier bridge T2 is made up of diode D5, diode D6, diode D7 and diode D8, two inputs of rectifier bridge T2 connect AC power U2, DC capacitor C2 two ends connect two outputs of rectifier bridge T2 respectively, and the two ends up and down of DC capacitor C2 are respectively the forward end of the second AC power supply module and the negative end of the second AC power supply module.
Control signal generator comprises modulating wave generation module, Zero-cross comparator module, fixed value comparison module, first carrier comparison module, the second carrier wave comparison module and gate-controlled switch, Zero-cross comparator module, fixed value comparison module, first carrier comparison module, the second carrier wave comparison module respectively with modulating wave generation model calling, gate-controlled switch is connected respectively with Zero-cross comparator module, fixed value comparison module, first carrier comparison module, and gate-controlled switch has the first output and the second output.
A kind of modulator approach for described less-switch five-power level inverter, according to the power switch action of comparing the different pieces of information control response that the amplitude of modulating wave and carrier wave, phase place and frequency draw, what mainly compare can be the amplitude of modulating wave and carrier wave, and concrete steps are as follows:
(1) modulating wave generation module produces modulating wave Ma and carrier wave tr0, carrier wave tr1, modulating wave Ma is sinusoidal wave, and carrier wave tr0 is amplitude from the triangular wave changed 0 to N, and carrier wave tr1 is the triangular wave that amplitude changes between N to 2N, N is the maximum of carrier wave tr0 amplitude data, as shown in Figure 2;
(2) amplitude data of modulating wave and 0 compare by Zero-cross comparator module, if the amplitude data of modulating wave is greater than 0, the output valve of Zero-cross comparator module is 1, if the amplitude data of modulating wave is less than or equal to 0, the output valve of Zero-cross comparator module is 0, the output valve of Zero-cross comparator module is as the control signal of power switch Q1 and gate-controlled switch, and the inverted value of the output valve of Zero-cross comparator module is as the control signal of power switch Q4;
(3) amplitude data of the absolute value of modulating wave amplitude data and carrier wave tr0 compares by first carrier comparison module, if the absolute value of modulating wave amplitude data is greater than the amplitude data of carrier wave tr0, the output valve of first carrier comparison module is 1, if the absolute value of modulating wave amplitude data is less than or equal to the amplitude data of carrier wave tr0, the output valve of first carrier comparison module is 0;
(4) absolute value of modulating wave amplitude data and fixed value N compare by fixed value comparison module, if the absolute value of modulating wave amplitude data is greater than fixed value N, the output valve of fixed value comparison module is 1, if the absolute value of modulating wave amplitude data is less than or equal to fixed value N, the output valve of fixed value comparison module is 0;
The amplitude data of the absolute value of modulating wave amplitude data and carrier wave tr1 compares by (5) second carrier wave comparison modules, if the absolute value of modulating wave amplitude data is greater than the amplitude data of carrier wave tr1, the output valve of the second carrier wave comparison module is 1, if the absolute value of modulating wave amplitude data is less than or equal to the amplitude data of carrier wave tr1, the output valve of the second carrier wave comparison module is 0;
(6) inverted value of the output valve of fixed value comparison module that the output valve of first carrier comparison module that obtains of step (3) and step (4) obtain is carried out logic and operation and is obtained the first logical AND value, if the output valve of Zero-cross comparator module is the 0, first logical AND value output to the first output of gate-controlled switch and the first logical AND value as the control signal of power switch Q3, the inverted value of the first logical AND value is as the control signal of power switch Q2, if the output valve of Zero-cross comparator module is the 1, first logical AND value output to the second output of gate-controlled switch and the first logical AND value as the control signal of power switch Q2, the inverted value of the first logical AND value is as the control signal of power switch Q3,
(7) output valve of the second carrier wave comparison module that the output valve of fixed value comparison module that obtains of step (4) and step (5) obtain is carried out logic and operation and is obtained the second logical AND value, the second logical AND value as the control signal of power switch Q5, the inverted value of the second logical AND value as the control signal of power switch Q6.
Pass through above-mentioned steps, effectively can modulate five-electrical level inverter, switch stress is less, work is more stable, power loss is little, efficiency is higher, the thin content of ac output voltage is less, output current can be similar to the ideal current thought without harmonic wave, thus can be widely used in the instrument, equipment etc. higher to line voltage requirement such as accurate measurement, communication, precision machine tool and Medical Devices.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within protection scope of the present invention.
Claims (7)
1. a less-switch five-power level inverter, is characterized in that: comprise load, reactor, power switch circuit, first AC power supply module, second AC power supply module and control signal generator, described load is provided with a end and b end, and described power switch circuit comprises power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5 and power switch Q6, the first described AC power supply module and the second AC power supply module all have forward end and negative end, and one end of described reactor connects a end of load, the other end of reactor and the emitter of power switch Q1, the collector electrode electrical connection of power switch Q4, the b end of load and the emitter of power switch Q2, the collector electrode electrical connection of power switch Q3, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the emitter of power switch Q5, the emitter electrical connection of power switch Q6, the emitter of power switch Q3, the emitter electrical connection of power switch Q4, the forward end of the first AC power supply module is electrically connected with the collector electrode of power switch Q5, the negative end of the first AC power supply module, the forward end of the second AC power supply module is electrically connected with the collector electrode of power switch Q6 respectively, and the negative end of the second AC power supply module is electrically connected with the emitter of power switch Q3, power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5 and power switch Q6 is electrically connected with control signal generator respectively.
2. less-switch five-power level inverter according to claim 1, is characterized in that: described reactor is smoothing reactor.
3. less-switch five-power level inverter according to claim 1, is characterized in that: described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6 are IGBT.
4. less-switch five-power level inverter according to claim 1, is characterized in that: described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6 are MOSFET.
5. less-switch five-power level inverter according to claim 1, it is characterized in that: the first described AC power supply module and the second AC power supply module include AC power, rectifier bridge and DC capacitor, two inputs of rectifier bridge connect AC power, and DC capacitor two ends connect two outputs of rectifier bridge respectively.
6. less-switch five-power level inverter according to claim 1, it is characterized in that: described control signal generator comprises modulating wave generation module, Zero-cross comparator module, fixed value comparison module, first carrier comparison module, second carrier wave comparison module and gate-controlled switch, described Zero-cross comparator module, fixed value comparison module, first carrier comparison module, second carrier wave comparison module respectively with modulating wave generation model calling, gate-controlled switch and Zero-cross comparator module, fixed value comparison module, first carrier comparison module connects respectively, gate-controlled switch has the first output and the second output.
7., for a modulator approach for less-switch five-power level inverter according to claim 1, it is characterized in that: comprise the steps:
(1) modulating wave generation module produces modulating wave Ma and carrier wave tr0, carrier wave tr1, and modulating wave Ma is sinusoidal wave, and carrier wave tr0 is the triangular wave changed between 0 to N, and carrier wave tr1 is the triangular wave changed between N to 2N, and N is the maximum of carrier wave tr0 data;
(2) data of modulating wave and 0 compare by Zero-cross comparator module, if the data of modulating wave are greater than 0, the output valve of Zero-cross comparator module is 1, if the data of modulating wave are less than or equal to 0, the output valve of Zero-cross comparator module is 0, the output valve of Zero-cross comparator module is as the control signal of power switch Q1 and gate-controlled switch, and the inverted value of the output valve of Zero-cross comparator module is as the control signal of power switch Q4;
(3) data of the absolute value of modulating wave data and carrier wave tr0 compare by first carrier comparison module, if the absolute value of modulating wave data is greater than the data of carrier wave tr0, the output valve of first carrier comparison module is 1, if the absolute value of modulating wave data is less than or equal to the data of carrier wave tr0, the output valve of first carrier comparison module is 0;
(4) absolute value of modulating wave data and fixed value N compare by fixed value comparison module, if the absolute value of modulating wave data is greater than fixed value N, the output valve of fixed value comparison module is 1, if the absolute value of modulating wave data is less than or equal to fixed value N, the output valve of fixed value comparison module is 0;
The data of the absolute value of modulating wave data and carrier wave tr1 compare by (5) second carrier wave comparison modules, if the absolute value of modulating wave data is greater than the data of carrier wave tr1, the output valve of the second carrier wave comparison module is 1, if the absolute value of modulating wave data is less than or equal to the data of carrier wave tr1, the output valve of the second carrier wave comparison module is 0;
(6) inverted value of the output valve of fixed value comparison module that the output valve of first carrier comparison module that obtains of step (3) and step (4) obtain is carried out logic and operation and is obtained the first logical AND value, if the output valve of Zero-cross comparator module is the 0, first logical AND value output to the first output of gate-controlled switch and the first logical AND value as the control signal of power switch Q3, the inverted value of the first logical AND value is as the control signal of power switch Q2, if the output valve of Zero-cross comparator module is the 1, first logical AND value output to the second output of gate-controlled switch and the first logical AND value as the control signal of power switch Q2, the inverted value of the first logical AND value is as the control signal of power switch Q3,
(7) output valve of the second carrier wave comparison module that the output valve of fixed value comparison module that obtains of step (4) and step (5) obtain is carried out logic and operation and is obtained the second logical AND value, the second logical AND value as the control signal of power switch Q5, the inverted value of the second logical AND value as the control signal of power switch Q6.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174801A (en) * | 2007-10-30 | 2008-05-07 | 黑龙江工商职业技术学院 | Less-switch five-power level voltage source type inverter and control method thereof |
| US20130301314A1 (en) * | 2012-05-10 | 2013-11-14 | Futurewei Technologies, Inc. | Multilevel Inverter Device and Method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174801A (en) * | 2007-10-30 | 2008-05-07 | 黑龙江工商职业技术学院 | Less-switch five-power level voltage source type inverter and control method thereof |
| US20130301314A1 (en) * | 2012-05-10 | 2013-11-14 | Futurewei Technologies, Inc. | Multilevel Inverter Device and Method |
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Application publication date: 20150408 |