CN209267468U - Boost three-leg inverter - Google Patents
Boost three-leg inverter Download PDFInfo
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- CN209267468U CN209267468U CN201920126621.2U CN201920126621U CN209267468U CN 209267468 U CN209267468 U CN 209267468U CN 201920126621 U CN201920126621 U CN 201920126621U CN 209267468 U CN209267468 U CN 209267468U
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Abstract
Boost three-leg inverter.The pressure resistance of power tube is generally in 800V or more usually in the system of 380V, and often calorific value is serious for the down tube of full bridge inverter, and the content of harmonic wave is also very high in power grid.The utility model composition includes power supply unit module (101), power supply unit module is connect with boost module (102) is recommended, boost module is recommended to connect with rectification filtering module (103), rectification filtering module is connect with three bridge arm inverter bridge modules (104), and three bridge arm inverter bridge modules are connect with LCL filter module (105)；Power supply unit module, recommend boost module, LCL filter module outputs signal to the A/D end of convert of DSP master controller (108) respectively, the PWM output port of DSP master controller respectively with isolation drive modules A (107), isolation drive module B(111) connect.The utility model is applied to boosting three-leg inverter.
Description
Technical field:
The utility model relates to a kind of boosting three-leg inverters.
Background technique:
Inverter is the equipment that direct current is converted to alternating current, is frequently used in active filter, reactive-load compensator, high pressure
Generally relatively high in the pressure resistance for selecting power tube in converter plant, the pressure resistance of power tube generally exists usually in the system of 380V
800V or more, and there are also the effects of current stream for the down tube of the long full bridge inverter used, and often the calorific value of down tube is tight
Weight, and when system access is into power grid, full bridge inverter and power grid carry out the exchange of energy, improve in power grid in this way
The content of harmonic wave.
Therefore, how a kind of inverter topology energy is provided, the cost of circuit is reduced, function can be reduced again by improving transfer efficiency
Rate pipe pressure resistance changes simultaneously continuous current circuit, is this field research emphasis.
The content that attached drawing 2 is shown is common full-bridge inverter topological structure, the pressure resistance of power tube in the system of 380V
Generally in 800V or more, and the down tube of the long full bridge inverter used is there are also the effect of current stream, often the hair of down tube
Heat is serious, and when Fig. 1 current transformer 102 is non-isolated, for electric loading 101 for leakage current can be generated when solar panels, when
Electrical equipment altogether when will generate discharge loop.
Utility model content:
In order to overcome the above problem of the existing technology, the purpose of the utility model is to provide a kind of three bridge arms of boosting are inverse
Become device.
Above-mentioned purpose is realized by following technical scheme:
A kind of boosting three-leg inverter, composition include: power supply unit module, the power supply unit module with recommend
Boost module connection, the boost module of recommending are connect with rectification filtering module, the rectification filtering module and three bridge arms
Inverter bridge module connection, the three bridge arm inverter bridge modules are connect with LCL filter module, the LCL filter module and confession
Electric loading connection；
The power supply unit module, it is described recommend boost module, the LCL filter module outputs signal to respectively
The A/D end of convert of DSP master controller, the PWM output port of DSP master controller respectively with isolation drive modules A, isolation drive mould
Block B connection, the isolation drive modules A are connect with the boost module of recommending, the isolation drive module B with it is described
The connection of three bridge arm inverter bridge modules, the DSP master controller connect with data communication module, the data communication module
It is connect with upper computer module, the isolation drive modules A is identical as the isolation drive module B structure.
The boosting three-leg inverter, isolation drive module include signal conversion module, the signal modulus of conversion
Block is connect with drive module, voltage commutation filter module, the DSP master controller respectively, and the voltage commutation filters mould
Block by the coupling of electrical isolation signal by the Voltage Feedback after voltage commutation into IC control module, the IC control module
It is connect with power conversion circuit module, the power conversion circuit module is connect with the voltage commutation filter module.
The boosting three-leg inverter, the three bridge arm inverter bridge modules include left bridge arm, intermediate bridge arm and the right side
Bridge arm, the left bridge arm include metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, intermediate bridge arm include IGBT pipe QT1, IGBT pipe QT2, metal-oxide-semiconductor Q3,
Metal-oxide-semiconductor Q4, right bridge arm include metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6；The pin L1 of left bridge arm is connected with the positive input terminal of capacitor, left bridge arm
L2 pin is connected with the negative input end of capacitor, and the L3 pin of left bridge arm is connected with M1, M2 of intermediate bridge arm, the L4 pin of left bridge arm
It is connected with the M3 of intermediate bridge arm, the pin R1 of right bridge arm is connected with the positive input terminal of capacitor, the R2 pin of right bridge arm and capacitor
Negative input end connection, the R3 pin of right bridge arm are connected with M4, M5 of intermediate bridge arm, the M6 of the R4 pin of right bridge arm and intermediate bridge arm
Connection.
The utility model has the beneficial effects that
The utility model uses three bridge arm inversion topologicals, which introduces two on the basis of conventional full bridge inverter circuit
Metal-oxide-semiconductor and two IGBT pipes, DC side and grid side are isolated when constituting continuous current circuit, substantially reduces the electricity due to caused by afterflow
Net harmonic wave, and the pressure resistance for being located at two metal-oxide-semiconductors Q1, Q6 of lower end can be the half of upper end metal-oxide-semiconductor Q1, Q5 pressure voltage.This
The control of utility model topology is simple, at low cost, while the advantages such as the THD for cooperating unipolarity to modulate is low.Isolation drive is used simultaneously
Circuit, isolated drive circuit is completely isolated by the driving of DSP and power section, greatly reduces the difficulty of fabric swatch, driving system
System only needs a kind of power supply to be just able to satisfy driving requirement, prevents the interference of power section from entering DSP drive part, greatly improves length
The stability of time operation.
The utility model includes the Converting Unit of three bridge arm structures, recommends boosting part, rectifying and wave-filtering part, Feedback of Power
The DSP of part, isolation drive part and external control, battery recommend booster circuit by current rectifying and wave filtering circuit finally by
Novel three bridge arms inverter bridge exports alternating current, and DSP sampling pin is connected to power samples part, and DSP is respectively to isolation drive electricity
Road exports PWM drive waveforms, recommends booster circuit by isolation and the power amplification control of isolated drive circuit and three bridge arms are inverse
Become the power tube of bridge.The utility model reduces the pressure resistance of down tube, and the continuous current circuit by changing inverter reduces loss, reduces
The voltage ripple of output improves system effectiveness, improves the stability of system.
Detailed description of the invention:
Attached drawing 1 is the inverter circuit functional block diagram of the utility model.
Attached drawing 2 is existing H4 single-phase inversion circuit diagram.
Attached drawing 3 is the circuit diagram of three bridge arm inverter bridge of the utility model.
Attached drawing 4 is the signal of current direction when three bridge arm inverter bridge positive half cycle capacitor of the utility model provides electric energy to load
Figure.
The schematic diagram of current direction when attached drawing 5 is three bridge arm inverter bridge positive half cycle afterflow of the utility model.
Attached drawing 6 is the signal of current direction when three bridge arm inverter bridge negative half period capacitor of the utility model provides electric energy to load
Figure.
The schematic diagram of current direction when attached drawing 7 is three bridge arm inverter bridge negative half period afterflow of the utility model.
Attached drawing 8 is the isolation drive functional block diagram of the utility model isolation drive module.
Attached drawing 9 is the operation work flow diagram of the utility model.
Specific embodiment:
Embodiment 1:
A kind of boosting three-leg inverter, composition include: power supply unit module, the power supply unit module with recommend
Boost module connection, the boost module of recommending are connect with rectification filtering module, the rectification filtering module and three bridge arms
Inverter bridge module connection, the three bridge arm inverter bridge modules are connect with LCL filter module, the LCL filter module and confession
Electric loading connection；
The power supply unit module, it is described recommend boost module, the LCL filter module outputs signal to respectively
The A/D end of convert of DSP master controller, the PWM output port of DSP master controller respectively with isolation drive modules A, isolation drive mould
Block B connection, the isolation drive modules A are connect with the boost module of recommending, the isolation drive module B with it is described
The connection of three bridge arm inverter bridge modules, the DSP master controller connect with data communication module, the data communication module
It is connect with upper computer module, the isolation drive modules A is identical as the isolation drive module B structure.
Power supply unit module 101: the battery for being 12V to 48V by voltage range, solar panels or other low-tension supplies connect
Enter power supply unit module, power supply unit module a part translate into 15V control system supply voltage and isolation drive it is defeated
Enter power supply, voltage is supplied to Boost topology by another part power supply unit module.
Recommend boost module 102: the voltage that power supply unit module is provided is exported by the driving of DSP by low-voltage DC
It is converted into High Level AC Voltage, and low-voltage direct part and high-voltage alternating part are electrically isolated completely to.
Rectification filtering module 103: it is by DC conversion by fast recovery diode and filter capacitor by High Level AC Voltage
Alternating current guarantees the stabilization of direct current supply.
Three bridge arm inverter bridge modules 104: direct current is generated by DSP driving and the output of isolation drive makes bridge arm respectively
DC conversion is the high-frequency alternating current needed by conducting.
Filter module 105: high-frequency alternating current is filtered out high-frequency harmonic by LCL low-pass filtering, output simple alternating current letter
Number.
For electric loading 106: alternating current caused by inverter can be directly connected to power grid offer electric energy or connection electricity consumption is set
It is standby carry out using.
Isolation drive modules A 107 and isolation drive module B111: by the drive waveforms of DSP input and pass through voltage and function
The transformation of rate is driven to the corresponding power tube of three bridge arms.
Master controller DSP module 108:DSP carries out sampling by the output voltage to step-up transformer and inverter bridge exports
Current Voltage is sampled, and the switching tube in power tube and inverter bridge bridge arm to boost module controls.
Data communication module 109:FPGA is mainly responsible for the communication of data, realizes the data interaction of distal end, improves DSP operation
Processing speed.
Upper computer module 110: remotely monitoring and controlling the output state of inverter by host computer, realizes human-computer interaction function
Energy.
Embodiment 2:
According to boosting three-leg inverter described in embodiment 1, isolation drive module includes signal conversion module, described
Signal conversion module is connect with drive module, voltage commutation filter module, the DSP master controller respectively, the voltage
Rectification filtering module by the coupling of electrical isolation signal by the Voltage Feedback after voltage commutation into IC control module, it is described
IC control module is connect with power conversion circuit module, and the power conversion circuit module and the voltage commutation filter mould
Block connection.
Fig. 8 is isolation drive functional block diagram, comprising:
Master control IC module 301: controlling the output of PWM by IC, and carries out chip and enable, overvoltage, under-voltage, overcurrent
Deng control.
Power conversion modules 302: controlling power section by the output of PWM, by high-frequency PWM to transformer into
Row excitation and demagnetization.
Voltage commutation part 303: carrying out rectifying and wave-filtering by transformer coupled voltage and current, be converted into+15V, 0V ,-
15V DC voltage.
Feedback fraction 304 is isolated: by the coupling of electrical isolation signal by the Voltage Feedback after voltage commutation to master control IC
In module, what carries out pressure stabilizing from.
Signal conversion module 305: the 1 of signaling module connected with 2 pins DSP output pwm signal, the 3 of signaling module, 4,
+ the 15V of 5 connection voltage commutation parts, 0V, -15V DC voltage, 6 and 7 pins of signaling module are the output of signal.
Drive module 306: 6 and 7 pins of 1 and 2 connection signal modules of drive module, the 3 of drive module and 4 connect respectively
Connect the grid of metal-oxide-semiconductor and the base stage and emitter of drain electrode or IGBT pipe.
Embodiment 3:
The boosting three-leg inverter according to embodiment 1 or 2, the three bridge arm inverter bridge modules include left bridge
Arm, intermediate bridge arm and right bridge arm, the left bridge arm include metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, intermediate bridge arm include IGBT pipe QT1,
IGBT pipe QT2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, right bridge arm include metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6；The pin L1 and capacitor of left bridge arm are just
Input terminal connection, the L2 pin of left bridge arm are connected with the negative input end of capacitor, M1, M2 of the L3 pin of left bridge arm and intermediate bridge arm
Connection, the L4 pin of left bridge arm are connected with the M3 of intermediate bridge arm, and the pin R1 of right bridge arm is connected with the positive input terminal of capacitor, right bridge
The R2 pin of arm is connected with the negative input end of capacitor, and the R3 pin of right bridge arm is connected with M4, M5 of intermediate bridge arm, the R4 of right bridge arm
Pin is connected with the M6 of intermediate bridge arm.
Fig. 4 is the flow direction of the electric current when positive half cycle, and Fig. 5 is the flow direction of electric current positive half cycle afterflow, and Fig. 6 is negative half-cycle current
Flow direction, Fig. 7 are the flow direction of electric current negative half period freewheel current.Q1, Q2, Q3, Q4, Q5 and Q6 are the pwm control signal of high frequency, QT1
It is the trigger signal of synchronism output electric voltage frequency with QT2.When positive half cycle current as shown in figure 4, successively flow through 301a, Q1, LS1,
302, LS2, QT1, Q5, Q6 and 301b.When power tube Q1 and Q6 cut-off, as shown in figure 5, positive half cycle freewheeling path successively flows through
Q3, LS1,302, LS2 and QT1, positive half cycle continuous current circuit is improved compared with full-bridge inverting.When negative half-cycle current such as Fig. 6 institute
Show, successively flows through 301a, Q5, LS2,302, LS1, QT2, Q2 and 301b.When power tube Q5 and Q2 cut-off, as shown in fig. 7, negative
Half cycle freewheeling path successively flows through Q4, LS2,302, LS1 and QT2, and negative half period continuous current circuit is improved compared with full-bridge inverting.
Embodiment 4:
The boosting adjusting method of above-mentioned boosting three-leg inverter, power supply unit connect HF switch booster circuit, so
Three bridge arm inverter bridges are connected by current rectifying and wave filtering circuit afterwards and finally access power grid or load；
Battery recommends booster circuit and exports alternating current, DSP finally by three bridge arm inverter bridges by current rectifying and wave filtering circuit
Sampling pin is connected to power samples part, and DSP exports PWM drive waveforms to isolated drive circuit respectively, by isolation drive
The power tube of booster circuit and three bridge arm inverter bridges is recommended in isolation and the power amplification control of circuit；
Output signal after the preposition feedback end acquisition step-up transformer rectifying and wave-filtering of main control DSP, postposition feedback end are adopted
Collect inverter output voltage current signal and grid-connected voltage signal, drive waveforms, drive waveforms real-time control are generated by feedback
The number that the left bridge arm of three-leg inverter, intermediate bridge arm and right bridge arm, main control DSP communication ends and FPGA communication ends pass through 16bit
It is attached according to line, FPGA is wirelessly transferred by 4G and is attached with server and display interface.
Embodiment 5:
According to it is as described in example 4 boosting three-leg inverter boosting adjusting method, isolation drive module including
The part IC is controlled, IC is attached partially to power conversion section input terminal, the output end connection wave rectification of power conversion section
Input terminal, the input terminal of the output end connection Voltage Feedback of wave rectification, the output end of Voltage Feedback are connected to the anti-of control IC
Pin is presented, the output end of wave rectification is connected to the bipolar voltage receiving end of signal conversion simultaneously, and the input of signal conversion is driven
Dynamic pin connects DSP driving signal, and the output pin of signal conversion connects power switch tube, and the driving signal of DSP passes through isolation
Unipolarity power supply is converted to bipolar voltage driving output by drive module.
Fig. 9 is operation work flow diagram, comprising:
Step 501: the normal connection of power supply unit checks whether power supply unit voltage is normal by DSP, and passes through power supply
Equipment is powered to the primary side of system.
Step 502: when power supply unit voltage normally after by DSP driving recommend booster circuit and be converted to low-voltage DC
High voltagehigh frequency alternating current.
Step 503: so that DSP is checked that high-voltage dc signal determines direct current by carrying out rectifying and wave-filtering to high voltagehigh frequency alternating current
The voltage range of high pressure.
Step 504: using the interaction of controller and host computer, system grid connection or off-line operation are selected, when selecting grid-connected
The size for determining output electric current, the size of output voltage is determined when independent operating.
Step 505: the power tube that PWM wave drives three-leg inverter being generated by the calculating of DSP, passes through LCL filtered electrical
High voltage direct current is converted to required alternating current by road.
Claims (3)
1. a kind of boosting three-leg inverter, composition includes: power supply unit module, it is characterized in that: the power supply unit mould
Block is connect with boost module is recommended, and the boost module of recommending is connect with rectification filtering module, the rectification filtering module
It is connect with three bridge arm inverter bridge modules, the three bridge arm inverter bridge modules are connect with LCL filter module, the LCL filtering
Module is connect with for electric loading；
The power supply unit module, it is described recommend boost module, the LCL filter module outputs signal to DSP respectively
The A/D end of convert of master controller, the PWM output port of DSP master controller respectively with isolation drive modules A, isolation drive module B
Connection, the isolation drive modules A connect with the boost module of recommending, the isolation drive module B with it is described
The connection of three bridge arm inverter bridge modules, the DSP master controller connect with data communication module, the data communication module and
Upper computer module connection, the isolation drive modules A are identical as the isolation drive module B structure.
2. boosting three-leg inverter according to claim 1, it is characterized in that: isolation drive module includes signal modulus of conversion
Block, the signal conversion module are connect with drive module, voltage commutation filter module, the DSP master controller respectively, institute
The voltage commutation filter module stated is by the coupling of electrical isolation signal by the Voltage Feedback after voltage commutation to IC control module
In, the IC control module is connect with power conversion circuit module, the power conversion circuit module and the voltage
Rectification filtering module connection.
3. boosting three-leg inverter according to claim 1 or 2, it is characterized in that: the three bridge arm inverter bridge modules
Including left bridge arm, intermediate bridge arm and right bridge arm, the left bridge arm includes metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, and intermediate bridge arm includes IGBT
Pipe QT1, IGBT pipe QT2, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, right bridge arm include metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6；The pin L1 and electricity of left bridge arm
The positive input terminal of appearance connects, and the L2 pin of left bridge arm is connected with the negative input end of capacitor, the L3 pin of left bridge arm and intermediate bridge arm
M1, M2 connection, the M3 of the L4 pin of left bridge arm and intermediate bridge arm connects, the pin R1 of right bridge arm and the positive input terminal company of capacitor
It connects, the R2 pin of right bridge arm is connected with the negative input end of capacitor, and the R3 pin of right bridge arm is connected with M4, M5 of intermediate bridge arm, right
The R4 pin of bridge arm is connected with the M6 of intermediate bridge arm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920126621.2U CN209267468U (en) | 2019-01-25 | 2019-01-25 | Boost three-leg inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920126621.2U CN209267468U (en) | 2019-01-25 | 2019-01-25 | Boost three-leg inverter |
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| CN209267468U true CN209267468U (en) | 2019-08-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687749A (en) * | 2019-01-25 | 2019-04-26 | 哈尔滨理工大学 | Boost three-leg inverter and boosting adjusting method |
-
2019
- 2019-01-25 CN CN201920126621.2U patent/CN209267468U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687749A (en) * | 2019-01-25 | 2019-04-26 | 哈尔滨理工大学 | Boost three-leg inverter and boosting adjusting method |
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| GR01 | Patent grant | ||
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Granted publication date: 20190816 Termination date: 20200125 |