CN108306536A - A kind of NPC three-level inverters of SPWM modulation - Google Patents
A kind of NPC three-level inverters of SPWM modulation Download PDFInfo
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- CN108306536A CN108306536A CN201810360305.1A CN201810360305A CN108306536A CN 108306536 A CN108306536 A CN 108306536A CN 201810360305 A CN201810360305 A CN 201810360305A CN 108306536 A CN108306536 A CN 108306536A
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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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
- H02M7/53—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
- H02M7/5387—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 in a bridge configuration
-
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of NPC three-level inverters of SPWM modulation, are related to power electronics field, using TMS320F28335 as controller, realize that DC AC are converted using SPWM modulator approaches；Driving circuit is built using light-coupled isolation device and PWM controller part；Sample circuit is made of low-pass filter circuit, direct current biasing, scaling circuit；The circuit of DC side optocoupler and voltage comparator composition realizes over-and under-voltage defencive function；Inversion output filters out higher hamonic wave using LC filters；The sinusoidal signal of acquisition is converted to square wave, realizes the measurement of the power-factor of load.The low-pass filtering that sample circuit uses can filter the high-frequency signal of HF switch generation, realize 50Hz sampling of sinusoidal signal, and NPC type three-level topology configuration switches pipes make on-off times reduce, the both end voltage value of switching tube halves, switching tube loss reduces.Three-level inverter in the present invention has the characteristics that simple in structure, efficiency compared with high, output level is more.
Description
Technical field
The present invention relates to power electronics fields, more particularly to a kind of NPC three-level inverters of SPWM modulation.
Background technology
The use of traditional fossil energy, keeps environmental pollution increasingly serious, occurs replacing traditional energy with solar energy therewith
Generation technology.Three-phase alternating current is used in people's life, and the electricity that solar energy is sent out is direct current, in order to realize that electric energy is converted, is led to
It is often used DC-AC converter techniques.With the maturation of power electronic technique, SVPWM modulation makes more efficient, the precision that electric energy is converted
More acurrate, failure rate reduces.But this high-performance inverter control complexity, should not be promoted maintenance difficult.
Invention content
An embodiment of the present invention provides a kind of NPC three-level inverters of SPWM modulation, can solve to deposit in the prior art
The problem of.
The present invention provides a kind of NPC three-level inverters of SPWM modulation, and the inverter includes controller, ePWM moulds
Block, driving circuit, three phase inverter bridge, LC filters, over-and under-voltage protection circuit and voltage and current sample circuit, DC source output
DC supply input to the three phase inverter bridge, the three phase inverter bridge modulates the output to DC source using SPWM and carries out inversion
Output is to threephase load after being filtered with LC, and the direct current of DC source is by over-and under-voltage protection circuit detection, detection
As a result it is input to the controller, the voltage and current that the voltage and current sample circuit exports the LC filters is adopted
Sample, sampled result are input in the controller, and the controller protects the testing result and electricity of circuit according to over-and under-voltage
The sampled result of current voltage sample circuit generates corresponding control signal, and the ePWM modules after control signal processing to generating phase
The driving control signal answered is input to driving circuit, is accordingly controlled to the three phase inverter bridge with controlling the driving circuit
System.
The NPC three-level inverters of a kind of SPWM modulation in the embodiment of the present invention, using TMS320F28335 as control
Device processed realizes that DC-AC is converted using SPWM modulator approaches；Driving circuit is built using light-coupled isolation device and PWM controller part；
Sample circuit is made of low-pass filter circuit, direct current biasing, scaling circuit；DC side optocoupler and voltage comparator composition
Circuit realize over-and under-voltage defencive function；Inversion output filters out higher hamonic wave using LC filters；The sinusoidal signal of acquisition turns
It is changed to square wave, realizes the measurement of the power-factor of load.The low-pass filtering that sample circuit uses can filter HF switch generation
High-frequency signal realizes that 50Hz sampling of sinusoidal signal, NPC type three-level topology configuration switches pipes make on-off times reduction, switching tube
Both end voltage value halve, switching tube loss reduce.Three-level inverter in the present invention have simple in structure, efficiency is higher,
The features such as output level is more.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the overall structure block diagram of the NPC three-level inverters of SPWM provided in an embodiment of the present invention modulation；
Fig. 2 is the circuit structure diagram of three phase inverter bridge in Fig. 1；
Fig. 3 is the structure chart of optical coupler isolating type driving circuit in Fig. 1；
Fig. 4 is the structure chart of voltage sampling circuit in Fig. 1；
Fig. 5 is the square wave generative circuit structure chart coordinated with three phase inverter bridge in Fig. 2；
Fig. 6 is that over-and under-voltage protects circuit structure diagram in Fig. 1；
Fig. 7 is the circuit structure diagram of LC filters in Fig. 1.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig.1, a kind of NPC three-level inverters of SPWM modulation, the inverter packet are provided in the embodiment of the present invention
Include controller, ePWM modules, driving circuit, three phase inverter bridge, LC filters, over-and under-voltage protection circuit and voltage and current sampling
Circuit, the DC supply input of DC source output export after inversion and LC are filtered to threephase load to three phase inverter bridge,
The direct current of DC source also passes through over-and under-voltage protection circuit detection simultaneously, and testing result is input to controller, while voltage electricity
Stream sample circuit also samples the voltage and current of LC filters output, and sampled result also enters into controller, control
Device protects the corresponding control of sampled result production of the testing result and voltage and current sample circuit of circuit according to over-and under-voltage
Signal, ePWM modules generate corresponding driving control signal after being further processed to control signal and are input to driving circuit, with right
Three phase inverter bridge is accordingly controlled.
In the present embodiment, driving circuit uses optical coupler isolating type driving circuit, and controller is using at TMS320F28335
Manage device.
With reference to Fig. 2, DC source voltage is divided into two by three phase inverter bridge in DC side series connection two identical capacitance C1, C2
A voltage, to provide two identical DC sources.There are three branches for capacitance C1 both ends parallel connections, and each branch road is by a power
Switching tube and a Diode series composition, these three branches are respectively：Power switch tube S 1 and diode D1 series connection, power are opened
Close pipe S5 and diode D3 series connection, power switch tube S 9 and diode D5 series connection.The both ends capacitance C2 are also in parallel, and there are three branches, often
A branch road is made of a power switch tube and a Diode series, these three branches are respectively：Power switch tube S 4
With diode D2 series connection, power switch tube S 8 and diode D4 series connection, power switch tube S 12 and diode D6 series connection.Work(simultaneously
It is in series with power switch tube S 2 and S3 between rate switching tube S1 and S4, power switch tube is in series between power switch tube S 5 and S8
S6 and S7 is in series with power switch tube S 10 and S11, is connected between power switch tube S 2 and S3 between power switch tube S 9 and S12
Tie point exports Ua, Ub and Uc phase of three-phase electricity respectively between tie point, S10 and S11 between point, S6 and S7.
The control terminal of 12 power switch tubes is both connected on driving circuit in above-mentioned three phase inverter bridge, driving circuit output
Driving control signal control the on off state of each power switch tube so that the waveform of Ua, Ub, Uc output is close to sine
Wave.By taking Ua phases as an example, power switch tube S 1 and S4, S2 and S3 cannot be simultaneously turned on, S1 and S3, S2 and S4 complementations conducting, four
The turn-on time longest of S2 and S3 in power switch tube.The control of Ub and Uc phases is identical as Ua phases.
With reference to Fig. 3, driving circuit includes two high speed photo coupling UQ1 and UQ2 and driver UQ3, the present embodiment
In the models of two high speed photo couplings be 6N139, the model IR2110S of driver.
The pin 2 of high speed photo coupling UQ1 connects the output end of ePWM modules by resistance RQ1, and pin 3 is grounded, and pin 8 meets+5V
Power supply is grounded simultaneously also by capacitance CR3, is connected by resistance RQ3 between pin 6 and pin 8, and pin 5 is grounded, while also being led to
It crosses capacitance CR1 to connect with pin 6, pin 6 is additionally attached to the pin 12 of driver UQ3.The pin 2 of high speed photo coupling UQ2 passes through electricity
Resistance RQ2 connects the output end of ePWM modules, and pin 3 is grounded, and pin 8 connects+5V power supplys, is grounded simultaneously also by capacitance CR4, pin 6
It is connected by resistance RQ4 between pin 8, pin 5 is grounded, and is connect with pin 6 simultaneously also by capacitance CR2, pin 6 is also connected with
In the pin 14 of driver UQ3.
The pin 11 of driver UQ3 connects+15V power supplys, and pin 13 and 15 is grounded, and+15V is met simultaneously also by capacitance CR5
Power supply.Pin 8 controls signal all the way by resistance RQ5 outputs, and pin 1 controls signal, pin 6 all the way by resistance RQ6 outputs
It is respectively drive signal common end COM with 2.It is connected by capacitance CR7 between pin 2 and 3, pin 3 is also connected with+15V power supplys, together
When connect with pin 7 also by diode DR1.Pin 6 is connected with 7 by capacitance CR6.The two path control signal of above-mentioned output is used
S1 and S2 are controlled respectively in two power switch tubes for controlling same branch road in three phase inverter bridge, such as two path control signal.
Remaining power switch tube is also controlled using mutually isostructural driving circuit, is repeated no more in the present embodiment.
By taking Ua phases as an example, when power switch tube S 1 and S2 simultaneously turn on, and S3 and S4 are simultaneously turned off, if current direction is by straight
Source stream is flowed to load, if disregarding the voltage drop of each device, the current potential that Ua phases export is+U/2, if current direction is by loading
DC source is flowed to, then the current potential that Ua phases export also is+U/2.
When power switch tube S 2 and S3 are simultaneously turned on, and S1 and S4 are simultaneously turned off, born if current direction is flowed to by DC source
It carries, if disregarding the voltage drop of each device, the current potential that Ua phases export is identical as O point current potentials, if current direction is flowed by load
To DC source, then the current potential that Ua phases export is also identical as O point current potentials.
When power switch tube S 3 and S4 are simultaneously turned on, and S1 and S2 are simultaneously turned off, born if current direction is flowed to by DC source
It carries, if disregarding the voltage drop of each device, the current potential that Ua phases export is-U/2, if current direction flows to direct current by loading
Source, the then current potential that Ua phases export also are-U/2.
The course of work of Ub and Uc phases is identical as Ua phases, 120 ° of output voltage mutual deviation.
In order to which the two-way PWM of two high speed photo couplings composition is operated in mutual mode, the resistance value of resistance RQ1 and RQ2 are 330 Ω,
The resistance value of RQ3 and RQ4 is that the resistance value of 470 Ω, RQ5 and RQ6 are 330 Ω, and the capacitance in driving circuit selects tantalum capacitance, diode
Select Schottky diode.
With reference to Fig. 4, voltage and current sample circuit includes voltage sampling circuit and current sampling circuit, is adopted for voltage in Fig. 4
Sample circuit, the voltage sampling circuit include voltage transformer TV1, amplifier UV1A and UV1B, voltage transformer in the present embodiment
Model TV16E, the model LM358AD of amplifier.
Each phase voltage of LC filters output is all connected with a voltage sampling circuit and a current sampling circuit, voltage
The primary side of voltage transformer TV1 is connected to the output end of LC filters in sample circuit, and secondary side is parallel with resistance RV1 and electricity
Hold CV1, one end ground connection of secondary side, the other end is connected to the homophase input of amplifier UV1A by concatenated resistance RV2 and RV3
End, the input terminal that leads to of amplifier UV1A are grounded by capacitance CV3, and resistance RV2 is connected with the tie point of RV3 by capacitance CV2
In the output end of amplifier UV1A, inverting input is grounded by resistance RV4, is connected to output end simultaneously also by resistance RV5, just
Pole power supply termination+5V power supplys are grounded simultaneously also by capacitance CV4, and negative power supply end ground connection, output end is connected by resistance RV6
In the in-phase input end of amplifier UV1B.
The in-phase input end of amplifier UV1B is connected to the sliding end of variable resistance RV8 by concatenated resistance RV6 and RV7,
A termination+5V power supplys of variable resistance RV8, other end ground connection, output end is connected to simultaneously also by zener diode DV1,
The plus earth of middle zener diode.The inverting input of amplifier UV1B is grounded by resistance RV9, is connect also by resistance RV10 defeated
Outlet, output end pass through resistance RV11 output voltage sampled results.
The structure of current sampling circuit and the structure of above-mentioned voltage sampling circuit are essentially identical, and difference place is only that will be upper
It states voltage transformer TV1 and is changed to current transformer TA1, the model TA12-200 of current transformer TA1 in the present embodiment.
With reference to Fig. 5, in order to obtain the power factor of load, it is also necessary to voltage and current be sampled electricity using square wave generative circuit
The sine voltage signal that road samples is converted to the square-wave signal of same frequency, and obtained square-wave signal is input to controller
ECAP capturing units, the rise/fall by capturing six road square waves determine the power-factor angle of load along the time.Square wave generates
Circuit includes an amplifier UV4A, the model LM339D of amplifier UV4A in the present embodiment.
The output end of the homophase input termination three phase inverter bridge of amplifier UV4A, inverting input meet+5V by resistance RV35
Power supply is grounded, cathode power supply termination+5V power supplys simultaneously also by resistance RV38, and negative power supply end ground connection, output end passes through resistance
RV41 connects+5V power supplys, is grounded also by zener diode DV4, wherein the plus earth of zener diode DV4, output end, that is, defeated
The square-wave signal being born.
With reference to Fig. 6, over-and under-voltage protects the voltage of circuit acquisition DC source, and the voltage threshold of itself and setting is compared
Compared with, if the voltage of input is more than the voltage threshold of setting, one high level of output to controller, the control response high level
Signal makes ePWM module from service by interrupting, and to achieve the purpose that protect inverter, improves the reliability of overall work.
It includes two amplifiers UB1A, UB1B and an optocoupler TLP1 that over-and under-voltage, which protects circuit, amplifier in the present embodiment
Model be LM339D, the model TLP521-2 of optocoupler.The inverting input of amplifier UB1A and the in-phase input end of UB1B
Connection, while DC source output is connect by resistance RQ14, it is grounded also by resistance RQ15.The in-phase input end of amplifier UB1A passes through
Variable resistance RQ9 ground connection connects+12V power supplys, cathode power supply termination+12V power supplys, negative power supply termination simultaneously also by resistance RQ7
Ground, output end are connected to the pin 2 of optocoupler TLP1 by resistance RQ11.The inverting input of amplifier UB1B passes through variable resistance
RQ10 is grounded, and+12V power supplys are connect simultaneously also by resistance RQ8, and output end is connected to the pin 4 of optocoupler TLP1 by resistance RQ12,
The pin 1 and 3 of optocoupler TLP1 is both connected to+12V power supplys, and pin 5 and 7 is grounded, and pin 6 and 8 is output end, and the output end is also logical
It crosses resistance RQ13 and connects+3.3V power supplys.
With reference to Fig. 7, the LC filters filter out the high frequency harmonic signals that inversion exports, keep output waveform closer with just
String wave.The identical inductance L (L=L1=L2=L3) of one group of parameter of inverter bridge output end series connection, then one group of parameter in parallel is identical
The capacitor group of capacitance C (C=C3=C4=C5), Y type wiring.
Controller is also connect with liquid crystal display LCD12864 in the present embodiment, the electrical parameter for making controller handle
Display is on a liquid crystal display.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of NPC three-level inverters of SPWM modulation, which is characterized in that the inverter include controller, ePWM modules,
Driving circuit, three phase inverter bridge, LC filters, over-and under-voltage protection circuit and voltage and current sample circuit, DC source output
DC supply input to the three phase inverter bridge, the three phase inverter bridge using SPWM modulate the output to DC source carry out inversion and
Output is to threephase load after LC is filtered, and the direct current of DC source is by over-and under-voltage protection circuit detection, detection knot
Fruit is input to the controller, and the voltage and current that the voltage and current sample circuit exports the LC filters is adopted
Sample, sampled result are input in the controller, and the controller protects the testing result and electricity of circuit according to over-and under-voltage
The sampled result of current voltage sample circuit generates corresponding control signal, and the ePWM modules after control signal processing to generating phase
The driving control signal answered is input to driving circuit, is accordingly controlled to the three phase inverter bridge with controlling the driving circuit
System.
2. the NPC three-level inverters of SPWM modulation as described in claim 1, which is characterized in that the driving circuit uses
Optical coupler isolating type driving circuit, controller use TMS320F28335 processors.
3. the NPC three-level inverters of SPWM modulation as claimed in claim 2, which is characterized in that the three phase inverter bridge exists
DC side series connection two identical capacitance C1, C2, there are three branches for capacitance C1 both ends parallel connections, respectively：1 He of power switch tube S
Diode D1 series connection, power switch tube S 5 and diode D3 series connection, power switch tube S 9 and diode D5 series connection；The both ends capacitance C2
Also in parallel there are three branches, respectively：Power switch tube S 4 and diode D2 series connection, power switch tube S 8 and diode D4 strings
Connection, power switch tube S 12 and diode D6 series connection；Power switch tube S 2 and S3, work(are in series between power switch tube S 1 and S4
It is in series with power switch tube S 6 and S7 between rate switching tube S5 and S8, power switch is in series between power switch tube S 9 and S12
Pipe S10 and S11, tie point is distinguished between tie point, S10 and S11 between tie point, S6 and S7 between power switch tube S 2 and S3
Export Ua, Ub and Uc phase of three-phase electricity.
4. the NPC three-level inverters of SPWM modulation as claimed in claim 3, which is characterized in that in the three phase inverter bridge
The control terminal of 12 power switch tubes is both connected on the driving circuit, the driving control signal control of the driving circuit output
Make the on off state of each power switch tube；
The driving circuit includes two high speed photo coupling UQ1 and UQ2 and driver UQ3, the pin of high speed photo coupling UQ1
2 connect the output end of the ePWM modules by resistance RQ1, and pin 3 is grounded, and pin 8 connects+5V power supplys, simultaneously also by capacitance CR3
Ground connection, is connected between pin 6 and pin 8 by resistance RQ3, and pin 5 is grounded, and is connect with pin 6 simultaneously also by capacitance CR1,
Pin 6 is additionally attached to the pin 12 of driver UQ3；The pin 2 of high speed photo coupling UQ2 connects the ePWM modules by resistance RQ2
Output end, pin 3 are grounded, and pin 8 connects+5V power supplys, are grounded simultaneously also by capacitance CR4, are passed through electricity between pin 6 and pin 8
RQ4 connections are hindered, pin 5 is grounded, is connect with pin 6 simultaneously also by capacitance CR2, pin 6 is additionally attached to the pin of driver UQ3
14；
The pin 11 of driver UQ3 connects+15V power supplys, and pin 13 and 15 is grounded, and+15V power supplys are connect simultaneously also by capacitance CR5,
Pin 8 controls signal all the way by resistance RQ5 output, and pin 1 controls signal all the way by resistance RQ6 outputs, pin 6 and 2 points
Not Wei drive signal common end COM, connected by capacitance CR7 between pin 2 and 3, pin 3 is also connected with+15V power supplys, while
It is connect with pin 7 by diode DR1, pin 6 is connected with 7 by capacitance CR6, and the two path control signal of above-mentioned output is for controlling
Make two power switch tubes in the three phase inverter bridge.
5. the NPC three-level inverters of SPWM modulation as claimed in claim 4, which is characterized in that in the driving circuit
Capacitance selects tantalum capacitance, diode to select Schottky diode.
6. the NPC three-level inverters of SPWM modulation as described in claim 1, which is characterized in that the voltage and current sampling
Circuit includes voltage sampling circuit and current sampling circuit, and the structure of two sample circuits is identical, the voltage sampling circuit packet
Include voltage transformer TV1, amplifier UV1A and UV1B；
Each phase voltage of the LC filters output is all connected with a voltage sampling circuit and a current sample
Circuit, the primary side of voltage transformer TV1 is connected to the output end of LC filters in the voltage sampling circuit, and secondary side is in parallel
There are resistance RV1 and capacitance CV1, one end ground connection of secondary side, the other end to be connected to amplifier by concatenated resistance RV2 and RV3
The input terminal that leads to of the in-phase input end of UV1A, amplifier UV1A is grounded by capacitance CV3, and the tie point of resistance RV2 and RV3 are logical
The output end that capacitance CV2 is connected to amplifier UV1A is crossed, inverting input is grounded by resistance RV4, is connected simultaneously also by resistance RV5
It is connected on output end, cathode power supply termination+5V power supplys are grounded simultaneously also by capacitance CV4, negative power supply end ground connection, and output end is logical
Cross the in-phase input end that resistance RV6 is connected to amplifier UV1B；
The in-phase input end of amplifier UV1B is connected to the sliding end of variable resistance RV8 by concatenated resistance RV6 and RV7, can be changed
A termination+5V power supplys of resistance RV8, other end ground connection, are connected to output end, wherein surely simultaneously also by zener diode DV1
It presses the plus earth of diode, the inverting input of amplifier UV1B to be grounded by resistance RV9, output is connect also by resistance RV10
End, output end pass through resistance RV11 output voltage sampled results.
7. the NPC three-level inverters of SPWM as described in claim 1 modulation, which is characterized in that square wave generative circuit is by institute
The sine voltage signal for stating three phase inverter bridge output is converted to the square-wave signal of same frequency, and obtained square-wave signal is input to described
The eCAP capturing units of controller, the rise/fall by capturing two-way square wave determine the power-factor angle of load along the time.
8. the NPC three-level inverters of SPWM modulation as claimed in claim 7, which is characterized in that the square wave generative circuit
Including an amplifier UV4A, the output end of the homophase input termination three phase inverter bridge of amplifier UV4A, inverting input passes through resistance
RV35 connects+5V power supplys, is grounded simultaneously also by resistance RV38, cathode power supply termination+5V power supplys, negative power supply end ground connection, output
End connects+5V power supplys by resistance RV41, is grounded also by zener diode DV4, wherein the plus earth of zener diode DV4,
The square-wave signal that output end output generates.
9. the NPC three-level inverters of SPWM modulation as described in claim 1, which is characterized in that the over-and under-voltage protection
Circuit acquires the voltage of DC source, it is compared with the voltage threshold of setting, if the voltage of input is more than the electricity of setting
Threshold value is pressed, then exports a high level to the controller, the control response high level signal makes described by interruption
EPWM module from service；
The over-and under-voltage protection circuit includes two amplifiers UB1A, UB1B and an optocoupler TLP1, the reverse phase of amplifier UB1A
The in-phase input end of input terminal and UB1B connect, while connecing DC source output by resistance RQ14, are grounded also by resistance RQ15,
The in-phase input end of amplifier UB1A is grounded by variable resistance RQ9, and+12V power supplys, cathode power supply are connect simultaneously also by resistance RQ7
Termination+12V power supplys, negative power supply end ground connection, output end are connected to the pin 2 of optocoupler TLP1, amplifier UB1B by resistance RQ11
Inverting input be grounded by variable resistance RQ10, connect+12V power supplys simultaneously also by resistance RQ8, output end passes through resistance
RQ12 is connected to the pin 4 of optocoupler TLP1, and the pin 1 and 3 of optocoupler TLP1 is both connected to+12V power supplys, and pin 5 and 7 is grounded, draws
Foot 6 and 8 is output end, which also connects+3.3V power supplys by resistance RQ13.
10. the NPC three-level inverters of SPWM as described in claim 1 modulation, which is characterized in that the controller also with liquid
Crystal display LCD12864 connections, make the electrical parameter that the controller is handled be shown on the liquid crystal display.
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| CN113053442A (en) * | 2021-03-18 | 2021-06-29 | 华南师范大学 | Low-power consumption EEPROM memory |
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