CN204794754U - Single -phase non - isolation grid -connected inverter of high efficiency H7 type - Google Patents
Single -phase non - isolation grid -connected inverter of high efficiency H7 type Download PDFInfo
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- CN204794754U CN204794754U CN201520528216.5U CN201520528216U CN204794754U CN 204794754 U CN204794754 U CN 204794754U CN 201520528216 U CN201520528216 U CN 201520528216U CN 204794754 U CN204794754 U CN 204794754U
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Abstract
The utility model relates to a single -phase non - isolation grid -connected inverter of high efficiency H7 type, including seven switch tubes, filter module and modulated circuit modules. The source electrode that filter module connects at switch tube S5 inclines with exchanging, the modulated circuit module is used for generating seven drive signal in order to control respectively the switching on and turn -offing of seven switch tubes. The utility model provides a non - isolation single phase inverter of H7 type can eliminate common mode voltage's dither to can effectual suppression leakage current, and do not pass through the great body diode of switching loss in the afterflow stage. Simultaneously the used device of this structure is less, and the cost is lower, changes in the wide application.
Description
Technical field
The utility model relates to electric and electronic power conversion field, particularly relates to the single-phase non-isolated combining inverter of a kind of high efficiency H7 type.
Background technology
In recent years, combining inverter is applied to various different occasion, from Miniature inverter to single-phase low-power inverter again to high-power inverter three-phase, the various New Topologicals derived are not quite similar, the performance of topological structure not only decides the generating efficiency of whole system, and greatly affects useful life and the production cost of overall system.In order to improve the performance such as efficiency, reliability, power supply quality of combining inverter, all kinds of topological structure is proposed in succession, and from H4, H5 to H6 the earliest, new topological structure remains one of focus of scholars's research.It is the core objective studying New Topological that the basis ensureing low-leakage current is raised the efficiency.Combining inverter has direct current is converted to the alternating current the function accessing electrical network that meet civil power requirement.The normal isolation type grid-connected inverter adopting output transformer in tradition grid-connected system, electrical isolation is produced between electrical network and DC side, ensure personal safety, also voltage matches and grid-connected current DC component can be provided to suppress simultaneously, but Industrial Frequency Transformer adds volume, weight and cost, and high frequency transformer makes control from being complicated, reduce efficiency.The advantage that non-isolation type combining inverter is high with its efficiency, volume is little, cost is low, has become the main flow of combining inverter application at middle low power power field.But non-isolation type combining inverter, because do not have transformer, does not just have the electrical isolation function of transformer yet, thus brings new problem, be i.e. leakage problem.Leakage current is in the nature common mode current, and its producing cause there is parasitic capacitance between DC power supply and the earth, forms the common mode current loop be made up of parasitic capacitance, DC power supply and alternating current filter and electric network impedance.The change of common-mode voltage Uc can produce larger common mode current Icm in parasitic capacitance.Because the existence of Ground leakage current and common mode current, can reduce system effectiveness, infringement exports the quality of power supply, increases system electromagnetic interference, and threatens to the person, forms potential safety hazard.And Ground leakage current also can cause the saturated of alternating current filter too greatly, reduce filter effect, also may cause the damage of combining inverter simultaneously.Therefore, to non-isolation type and Transformer-free combining inverter, in German VDE-0126-1-1, specify that its Ground leakage current peak value should be less than 300mA.If exceed this prescribed limit, combining inverter and electrical network should depart from by leakage current monitoring unit in 0.3s.For resisting the leakage current of non-isolation type combining inverter, common-mode voltage Uc should be made to change smaller as far as possible.If can ensure, common-mode voltage Uc is certain value, then substantially can eliminate common mode current Icm, namely making inverter export two ends when power device adopts PWM to control is constant to the voltage sum of DC power cathode end respectively, that is A point and B point meet the voltage sum of N point: Ucm=(UAN+UBN)/2=constant, can eliminate the harm of leakage current Icm.
For common full-bridge grid-connected inverter, when adopting bipolar SPWM modulation system, this method has extraordinary common mode characteristic, but has relatively low conversion efficiency and poor also network electric energy quality.When adopting Unipolar SPWM modulation system, there is grid-connected current pulsating quantity little, be easy to the advantages such as filtering, but create the common-mode voltage of dither simultaneously, there is severe common mode characteristic, make it directly apply in the full-bridge grid-connected inverter of non-isolation type and be restricted.In correlation technique, the size of leakage current is relevant with modulator approach with the topological structure of combining inverter, different topological structures and modulator approach very large on the impact of leakage current.The basis of common full-bridge topology constructs new continuous current circuit, a series of new topological structure can be produced, to ensure that common-mode voltage is for constant in the whole course of work, eliminate the harm of leakage current.Therefore, one of object of research non-isolation type combining inverter is exactly how to construct new continuous current circuit, the common mode characteristic having high grid-connected current quality to make inverter simultaneously and become reconciled.Based on this, the H5 topology proposed in correlation technique, HERIC topology, H6 type topology (accompanying drawing three) is all passed through to construct new afterflow passage by drain current suppressing to very low, but the afterflow of these topologys through the body diode of the larger poor-performing of switching loss, will certainly be able to lower efficiency.
Utility model content
In order to solve the problems of the technologies described above, the single-phase non-isolated combining inverter of a kind of high efficiency H7 type that the utility model proposes can while the harm eliminating leakage current, and by building, new afterflow passage is comparatively large without switching loss, the body diode of poor-performing thus raise the efficiency.Concrete technical scheme is:
The single-phase non-isolated combining inverter of a kind of high efficiency H7 type, is made up of seven switching tube S1-S7, filtration module and modulation circuit modules.Wherein, the drain electrode of switching tube S1 is connected with the drain electrode of switching tube S2 and is connected to DC side anode, the source electrode of switching tube S1 is connected with the drain electrode of switching tube S7 and is connected to the drain electrode of switching tube S5, the source electrode of switching tube S7 is connected with the source electrode of switching tube S2 and is connected to the drain electrode of switching tube S6, the source electrode of switching tube S5 is connected with the drain electrode of switching tube S3 and is connected with one end of AC, the source electrode of switching tube S6 is connected with the drain electrode of switching tube S4 and is connected to other one end of AC, the source electrode of switching tube S3 is connected with the source electrode of switching tube S4 and is connected to the negative terminal of DC side.
Described filtration module is connected to source electrode and the AC of switching tube S5;
Described modulation circuit module, for generating seven drive singal to control the turn-on and turn-off of described seven switching tube S1-S7 respectively, exports simple alternating current grid-connected current to make described photovoltaic combining inverter.Described modulation circuit module is CPLD controller, the grid of switching tube S1, S4 receives the drive singal output drawn by sinusoidal wave and triangle wave, and the grid of switching tube S2, S3 receives the drive singal output drawn by the sine wave of phase 180 degree and same triangle wave; It is 1 that switching tube S5 grid is received at the positive half cycle of AC, the drive singal output that negative half period is obtained through inverse by switching tube S2, S3 drive singal; The grid of switching tube S6 is received and is obtained through inverse by switching tube S1, S4 drive singal at the positive half cycle of AC, and negative half period perseverance is the drive singal output of 1; The grid of switching tube S7 is received and is carried out by switching tube S5 negative half period drive singal and the positive half cycle drive singal of switching tube S6 the drive singal output that obtains with computing respectively.
The single-phase non-isolated combining inverter of novel H7 type that the utility model proposes is on the basis of the single-phase non-isolated inverter of traditional H6 type, removes diode continuousing flow passage, and between two brachium pontis, embeds a new metal-oxide-semiconductor S7 be used for afterflow.
There are four operation modes in each sinusoidal cycles:
Operation mode 1: during the positive half cycle of AC voltage, switching tube S5 conducting always, drives S1, S4 switch with identical signal, S2, S3 normal off.During S1, S4 conducting, input current forms loop through S1, S5, filter inductance, S4.
Operation mode 2:S1, S4 turn off, and S6, S7 are open-minded, and input current forms loop through S5, filter inductance, S6, S7.
Operation mode 3: during negative half period work, switching tube S6 conducting always, drives S2, S3 switch with identical signal, S1, S4 normal off.During S2, S3 conducting, input current forms loop through S2, S6, filter inductance, S3.
Operation mode 4:S2, S3 turn off, S6, S7 conducting, and electric current after filtering inductance S5, S7, S6 forms loop.
Further, for the consideration to closedown or conduction device required voltage, described switching tube S1-S7 selects N channel enhancement MOSFET.
Further, drain electrode and the source electrode of described switching tube S1-S7 are all connected a fly-wheel diode, for improving switching speed, maintain afterflow, reverse breakdown when preventing powered-down.
Further, described filtration module is inductance L 1, electric capacity C1, inductance L 2 be sequentially connected in series.
Further, described CPLD controller adopts MAX7000S, and better performances, price is relatively low.
The H7 structure that obvious the utility model proposes is when afterflow only through the metal-oxide-semiconductor S7 that switching tube loss is very little, and without the body diode of conventional topologies poor-performing, efficiency is able to effective raising.In addition, by eliminating the dither of common-mode voltage, effectively leakage current can be suppressed.The device that this structure is used is simultaneously less, and cost is lower, is easier to extensive use.
Accompanying drawing explanation
Fig. 1, main circuit structure of the present utility model.
Fig. 2, modulation circuit module drive singal.
Four kinds of operation modes of the utility model main circuit in Fig. 3, a sine wave period.
The main circuit diagram of Fig. 4, H6 type inverter.
Embodiment
Below in conjunction with embodiment, the utility model is described further.
The single-phase non-isolated combining inverter of a kind of high efficiency H7 type, is made up of seven switching tube S1-S7, filtration module and modulation circuit modules.Described seven switching tubes all adopt N channel enhancement metal-oxide-semiconductor.Wherein, the drain electrode of switching tube S1 is connected with the drain electrode of switching tube S2 and is connected to DC side anode, the source electrode of switching tube S1 is connected with the drain electrode of switching tube S7 and is connected to the drain electrode of switching tube S5, the source electrode of switching tube S7 is connected with the source electrode of switching tube S2 and is connected to the drain electrode of switching tube S6, the source electrode of switching tube S5 is connected with the drain electrode of switching tube S3 and is connected with one end of AC, the source electrode of switching tube S6 is connected with the drain electrode of switching tube S4 and is connected to other one end of AC, the source electrode of switching tube S3 is connected with the source electrode of switching tube S4 and is connected to the negative terminal of DC side.Source electrode and the drain electrode of described seven switching tubes are all connected to fly-wheel diode.
Described filtration module is connected to source electrode and the AC of switching tube S5; Described filtration module is sequentially connected in series by inductance L 1, electric capacity C1, inductance L 2.
Described modulation circuit module, for generating seven drive singal to control the turn-on and turn-off of described seven switching tube S1-S7 respectively, exports simple alternating current grid-connected current to make described photovoltaic combining inverter.Adopt MAX7000S as modulation signal generator in the present embodiment, the grid of switching tube S1, S4 receives the drive singal output drawn by sinusoidal wave and triangle wave, and the grid of switching tube S2, S3 receives the drive singal output drawn by the sine wave of phase 180 degree and same triangle wave; It is 1 that switching tube S5 grid is received at the positive half cycle of AC, the drive singal output that negative half period is obtained through inverse by switching tube S2, S3 drive singal; The grid of switching tube S6 is received and is obtained through inverse by switching tube S1, S4 drive singal at the positive half cycle of AC, and negative half period perseverance is the drive singal output of 1; The grid of switching tube S7 is received and is carried out by switching tube S5 negative half period drive singal and the positive half cycle drive singal of switching tube S6 the drive singal output that obtains with computing respectively.
The H7 structure that the utility model proposes is when afterflow only through the metal-oxide-semiconductor S7 that switching tube loss is very little, and without the body diode of conventional topologies poor-performing, efficiency is able to effective raising.
In suppression leakage current ability, operation mode 1: switching tube S1, S5, S4 conducting, now U
aN=U
dC, U
bN=0, so Uc=(U
aN+ U
bN)/2=U
dC/ 2.
Operation mode 2: when S1, S4 turn off, S5, S6, S7 afterflow.Now utilize S1, S3 switching tube junction capacitance of shutoff to realize all pressing, clamper A point is input voltage half to direct current ground voltage; Utilize S2, S4 switching tube junction capacitance turned off to realize all pressing, clamper B point is input voltage half to direct current ground voltage.This stage common-mode voltage Uc=0.5 (0.5U
dC+ 0.5U
dC)=0.5U
dC.
Operation mode 3: switching tube S2, S6, S3 conducting, now U
aN=0, U
bN=U
dC, have Uc=(U for common-mode voltage
aN+ U
bN)/2=U
dC/ 2.
Operation mode 4: when S2, S3 turn off, switching tube S5, S6, S7 afterflow.Now utilize S1, S3 switching tube junction capacitance of shutoff to realize all pressing, clamper A point is input voltage half to direct current ground voltage; Utilize S2, S4 switching tube junction capacitance turned off to realize all pressing, clamper B point is input voltage half to direct current ground voltage; Now U
aN=U
bN=0.5U
dC, so common-mode voltage value is Uc=(U
aN+ U
bN)/2=U
dC/ 2.Common-mode voltage is a steady state value, so leakage current can be ignored.
Following table is that existing H6 type inverter and technical parameter of the present invention contrast.
| 1 inverter scheme | Synchronizing mode | Power factor | Total harmonic content | DC component |
| H6 type | Single-phase | 95.5-97.3％ | <3.5％ | < 6% of output current |
| H7 type (the present invention) | Single-phase | 98.2-99.5％ | <2％ | < 4% of output current |
Claims (5)
1. the single-phase non-isolated combining inverter of high efficiency H7 type, is characterized in that: be made up of seven switching tube S1-S7, filtration module and modulation circuit modules;
Wherein, the drain electrode of switching tube S1 is connected with the drain electrode of switching tube S2 and is connected to DC side anode, the source electrode of switching tube S1 is connected with the drain electrode of switching tube S7 and is connected to the drain electrode of switching tube S5, the source electrode of switching tube S7 is connected with the source electrode of switching tube S2 and is connected to the drain electrode of switching tube S6, the source electrode of switching tube S5 is connected with the drain electrode of switching tube S3 and is connected with one end of AC, the source electrode of switching tube S6 is connected with the drain electrode of switching tube S4 and is connected to other one end of AC, the source electrode of switching tube S3 is connected with the source electrode of switching tube S4 and is connected to the negative terminal of DC side,
Described filtration module is connected to source electrode and the AC of switching tube S5;
Described modulation circuit module is CPLD controller, the grid of switching tube S1, S4 receives the drive singal output drawn by sinusoidal wave and triangle wave, and the grid of switching tube S2, S3 receives the drive singal output drawn by the sine wave of phase 180 degree and same triangle wave; It is 1 that switching tube S5 grid is received at the positive half cycle of AC, the drive singal output that negative half period is obtained through inverse by switching tube S2, S3 drive singal; The grid of switching tube S6 is received and is obtained through inverse by switching tube S1, S4 drive singal at the positive half cycle of AC, and negative half period perseverance is the drive singal output of 1; The grid of switching tube S7 is received and is carried out by switching tube S5 negative half period drive singal and the positive half cycle drive singal of switching tube S6 the drive singal output that obtains with computing respectively.
2. the single-phase non-isolated combining inverter of a kind of high efficiency H7 type as claimed in claim 1, is characterized in that: described switching tube S1-S7 adopts N channel enhancement MOSFET.
3. the single-phase non-isolated combining inverter of a kind of high efficiency H7 type as claimed in claim 1, is characterized in that: drain electrode and the source electrode of described switching tube S1-S7 are all connected a fly-wheel diode.
4. the single-phase non-isolated combining inverter of a kind of high efficiency H7 type as claimed in claim 1, is characterized in that: described filtration module is inductance L 1, electric capacity C1, inductance L 2 are sequentially connected in series.
5. the single-phase non-isolated combining inverter of a kind of high efficiency H7 type as claimed in claim 1, is characterized in that: described CPLD controller adopts MAX7000S.
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|---|---|---|---|---|
| CN104967350A (en) * | 2015-07-20 | 2015-10-07 | 安徽大学 | High-efficiency H7-type single-phase non-isolated grid-connected inverter |
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| CN104967350A (en) * | 2015-07-20 | 2015-10-07 | 安徽大学 | High-efficiency H7-type single-phase non-isolated grid-connected inverter |
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