CN103166495A - Single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter - Google Patents

Single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter Download PDF

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Publication number
CN103166495A
CN103166495A CN2011104101968A CN201110410196A CN103166495A CN 103166495 A CN103166495 A CN 103166495A CN 2011104101968 A CN2011104101968 A CN 2011104101968A CN 201110410196 A CN201110410196 A CN 201110410196A CN 103166495 A CN103166495 A CN 103166495A
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China
Prior art keywords
power switch
switch pipe
connect
electrode
power
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CN2011104101968A
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张犁
高峰
常东升
邢岩
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Shanghai Convertergy Energy Technology Co Ltd
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Shanghai Convertergy Energy Technology Co Ltd
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Priority to CN2011104101968A priority Critical patent/CN103166495A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/53Conversion 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
    • H02M7/537Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • H02J2300/24The renewable source being solar energy of photovoltaic origin
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • H02M1/0054Transistor switching losses
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter, and belongs to the technical field of power electronic converters. The single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter is composed of an input capacitance branch, an improved full-bridge switch unit and a net filter branch. On the basis of a basic full-bridge circuit, an auxiliary switch is disposed on the single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter, so that a after-flow return circuit is separated from an output end of a photovoltaic cell during after-flow, electric potential of the after-flow return circuit is or near to half of the cell voltage, and thus the non-isolated photovoltaic grid-connected inverter is prevented and avoided from leaking currents. Compared with the prior non-isolated photovoltaic inverter topology, the single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter has the advantages that number of switch tubes of current paths decreases, conduction losses are reduced, and conversion efficiency is improved. Further, the single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter is suitable for photovoltaic grid-connected sites without isolation of transformers.

Description

Single-phase asymmetric full-bridge non-isolated grid-connected inverter
Technical field
The invention belongs to the converters technical field, relate to the parallel network power generation technology, be specifically related to a kind of single-phase asymmetric full-bridge non-isolated grid-connected inverter.
Background technology
The absolute predominance such as non-isolated photovoltaic grid-connected inverter has that efficiency is high, volume is little, lightweight and cost is low.But due to the photovoltaic battery panel existence of parasitic capacitance over the ground, while making the switch motion of combining inverter switching device to produce high frequency, time variant voltage acts on parasitic capacitance, and consequent leakage current may exceed allowed band.The generation of high-frequency leakage current also can bring conduction and radiated interference, the humorous increase that involves loss of grid current, the safety that even jeopardizes equipment and personnel.
The differential mode characteristic good of the full-bridge grid-connected inverter of Unipolar SPWM, as high as the input direct voltage utilance and filter inductance current pulsation amount is little etc. is subject to extensive concern.But produced the common-mode voltage (its amplitude is input direct voltage) of switching frequency pulsation simultaneously, make and need to add transformer isolation (low frequency or high frequency) in grid-connected application scenario, but the common-mode voltage of dither constitutes a threat to the dielectric strength of transformer, further increased cost of manufacture.The full-bridge grid-connected powder inverter common-mode voltage substantially constant of bipolar SPWM, equal 1/2nd of photovoltaic cell input voltage all the time, can produce the common mode leakage current hardly.Yet with Unipolar SPWM, compare, bipolar SPWM exists obviously not enough: switching loss and ac filter inductor loss are all twices of Unipolar SPWM, have affected the efficiency of system.Therefore, one of purpose of research non-isolated grid-connected inverter is exactly how to form new continuous current circuit, and make afterflow stage continuous current circuit and photovoltaic cell output disconnect, thereby make converter there is the premium properties of low-leakage current and high conversion efficiency simultaneously.
Patent EP 1369985A2 proposes between the brachium pontis mid point of full-bridge circuit (AC) and adds the new continuous current circuit of two-way gate-controlled switch set constructor; Document " Yu W; Lai J; Qian H; Hutchens C; High-efficiency MOSFET inverter with H6-type configuration for photovoltaic nonisoltaed ac-module applications; IEEE Trans.on Power Electronics, 2011, vol.26 (4): 1253-1260 "; a kind of distortion topology based on Heric is proposed; can realize that equally afterflow stage solar cell end and electrical network break away from, but there are three switching devices all the time in current path, on-state loss is large.Document " Zhang Xing; Sun Longlin, permitted quite, and Zhao is; Cao Renxian; the research that in the single-phase non-isolated photovoltaic parallel in system, common mode current suppresses, solar energy journal, 2009; vol.30 (9): 1202-1208 ", a kind of distortion topology based on Heric of same proposition, but also there are three switching devices all the time in current path, and on-state loss is large.
Summary of the invention
The present invention is directed to the problems such as existing non-isolated photovoltaic grid-connected inverter generation leakage current and loss are large, and a kind of single-phase full bridge non-isolated grid-connected inverter had than high conversion efficiency is provided.This inverter has the performance of low-leakage current and high conversion efficiency.
In order to achieve the above object, the present invention adopts following technical scheme:
Single-phase asymmetric full-bridge non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, described single-phase asymmetric full-bridge non-isolated grid-connected inverter comprises input capacitance branch road (1) and network access filter branches (3), described single-phase asymmetric full-bridge non-isolated grid-connected inverter also comprises full-bridge switch unit (2), described input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively, and described full-bridge switch unit (2) comprises the first power switch pipe (S 1), the second power switch pipe (S 2), the 3rd power switch pipe (S 3), the 4th power switch pipe (S 4), the 5th power switch pipe (S 5), the 6th power switch pipe (S 6), the first power diode (D 1), the second power diode (D 2).
As an example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the 5th power switch pipe (S 5) emitter, the second power diode (D 2) anode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 6th power switch pipe (S 6) collector electrode and the second power diode (D 2) negative electrode, the 4th power switch pipe (S 4) drain electrode connect respectively the first power diode (D 1) anode, the 6th power switch pipe (S 6) emitter, the second filter inductance (L 2) an end, the 5th power switch pipe (S 5) collector electrode connect the first power diode (D 1) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the first power diode (D 1) negative electrode, the second power diode (D 2) anode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 6th power switch pipe (S 6) collector electrode, the second power diode (D 2) negative electrode, the 4th power switch pipe (S 4) drain electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the 6th power switch pipe (S 6) emitter, the second filter inductance (L 2) an end, the 5th power switch pipe (S 5) emitter connect the first power diode (D 1) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the first power diode (D 1) negative electrode, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the second power diode (D 2) anode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) anode, the 6th power switch pipe (S 6) emitter, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) collector electrode connect the second power diode (D 2) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the first power diode (D 1) negative electrode, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the 6th power switch pipe (S 6) collector electrode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) anode, the second power diode (D 2) negative electrode, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) emitter connect the second power diode (D 2) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the 5th power switch pipe (S 5) collector electrode, the second power diode (D 2) negative electrode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the first power diode (D 1) negative electrode, the 6th power switch pipe (S 6) collector electrode, the second filter inductance (L 2) an end, the 4th power switch pipe (S 4) drain electrode connect respectively the second power diode (D 2) anode, the 6th power switch pipe (S 6) emitter, the 5th power switch pipe (S 5) emitter connect the first power diode (D 1) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the first power diode (D 1) anode, the second power diode (D 2) negative electrode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 5th power switch pipe (S 5) emitter, the 6th power switch pipe (S 6) collector electrode, the second filter inductance (L 2) an end, the 4th power switch pipe (S 4) drain electrode connect respectively the second power diode (D 2) anode, the 6th power switch pipe (S 6) emitter, the 5th power switch pipe (S 5) collector electrode connect the first power diode (D 1) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the second power diode (D 2) negative electrode, the first filter inductance (L 1) an end, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the first power diode (D 1) anode, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) negative electrode, the 6th power switch pipe (S 6) collector electrode, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) emitter connect the second power diode (D 2) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
As another example of the present invention, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the 6th power switch pipe (S 6) emitter, the first filter inductance (L 1) an end, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the first power diode (D 1) anode, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) negative electrode, the second power diode (D 2) anode, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) collector electrode connect the second power diode (D 2) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
The present invention adopts technique scheme, has following beneficial effect:
(1) on basic full-bridge circuit basis, add auxiliary switch to realize that afterflow stage continuous current circuit and photovoltaic cell output break away from, and the continuous current circuit current potential in or approximate in 1/2nd cell voltage, thereby suppress and eliminate the leakage current of non-isolated grid-connected inverter;
(2) with respect to existing non-isolated grid-connected inverter topology, there is following advantage: reduced the switching tube quantity of current path, thereby reduced on-state loss, improved conversion efficiency;
(3) be applicable to the grid-connected occasion of transless isolation.
The accompanying drawing explanation
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment mono-of the present invention;
Fig. 2 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment bis-of the present invention;
Fig. 3 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment bis-of the present invention:
Fig. 4 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment tetra-of the present invention;
Fig. 5 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment five of the present invention;
Fig. 6 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment six of the present invention;
Fig. 7 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment seven of the present invention;
Fig. 8 is single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment eight of the present invention;
Fig. 9 is the drive principle waveform of single-phase asymmetric full-bridge non-isolated grid-connected inverter embodiment mono-of the present invention;
Figure 10 a is the equivalent circuit diagram of each switch mode 1 of single-phase asymmetric full-bridge non-isolated grid-connected inverter embodiment mono-of the present invention;
Figure 10 b is the equivalent circuit diagram of each switch mode 2 of single-phase asymmetric full-bridge non-isolated grid-connected inverter embodiment mono-of the present invention;
Figure 10 c is the equivalent circuit diagram of each switch mode 3 of single-phase asymmetric full-bridge non-isolated grid-connected inverter embodiment mono-of the present invention;
Figure 10 d is the equivalent circuit diagram of each switch mode 4 of single-phase asymmetric full-bridge non-isolated grid-connected inverter embodiment mono-of the present invention.
Symbol description in figure:
U pV-photovoltaic cell voltage, 1-input capacitance branch road, 2-improves full-bridge switch unit, 3-network access filter branches, v g-electrical network, C dc-input capacitance, S 1~S 6the-the first~six power switch pipe, L 1, L 2-first, second filter inductance, C o-filter capacitor, v e-modulation signal, v st-triangular carrier signal, v gs1~v gs6the driving voltage of the-the first~six power switch pipe, the t-time.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Single-phase asymmetric full-bridge non-isolated grid-connected inverter provided by the invention, it is identical with existing inverter when application, input is connected with solar cell, and output is connected with electrical network.
For solving the existing defect of prior art, the present invention adds auxiliary switch to realize that afterflow stage continuous current circuit and photovoltaic cell output break away from basic full-bridge circuit basis, and the continuous current circuit current potential in or approximate in 1/2nd cell voltage, thereby suppress and eliminate the leakage current of non-isolated grid-connected inverter.
For this reason, single-phase asymmetric full-bridge non-isolated grid-connected inverter provided by the invention comprises input capacitance branch road (1), full-bridge switch unit (2) and network access filter branches (3).Wherein input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively, and full-bridge switch unit (2) comprise the first power switch pipe (S 1), the second power switch pipe (S 2), the 3rd power switch pipe (S 3), the 4th power switch pipe (S 4), the 5th power switch pipe (S 5), the 6th power switch pipe (S 6), the first power diode (D 1), the second power diode (D 2).
Based on above-mentioned principle, specific embodiment of the invention is as follows:
Referring to Fig. 1, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment mono-, and its electric circuit constitute is: by input capacitance C dc, the first to the 6th power switch tube S 1~S 6, first, second power diode D 1~D 2, first, second filter inductance L 1, L 2with filter capacitor C oform; Input capacitance C dcform input capacitance branch road (1), the first to the 6th power switch tube S 1~S 6, first, second power diode D 1~D 2form full-bridge switch unit (2), first, second filter inductance L 1, L 2with filter capacitor C oform network access filter branches (3).
Wherein, input capacitance C dcanode connect respectively solar cell positive output end, the first power switch tube S 1drain electrode, the 3rd power switch tube S 3drain electrode, input capacitance C dcnegative terminal connect respectively solar cell negative output terminal, the second power switch tube S 2source electrode, the 4th power switch tube S 4source electrode; The first power switch tube S 1source electrode connect respectively the second power switch tube S 2drain electrode, the 5th power switch tube S 5emitter, the second power diode D 2anode, the first filter inductance L 1an end, the 3rd power switch tube S 3source electrode connect respectively the 6th power switch tube S 6collector electrode and the second power diode D 2negative electrode, the 4th power switch tube S 4drain electrode connect respectively the first power diode D 1anode, the 6th power switch tube S 6emitter, the second filter inductance L 2an end, the 5th power switch tube S 5collector electrode connect the first power diode D 1negative electrode; The first filter inductance L 1the other end connect respectively filter capacitor C oan end, electrical network v gan end, the second filter inductance L 2the other end connect respectively filter capacitor C othe other end, electrical network v gthe other end.
Referring to Fig. 2, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment bis-, and its electric circuit constitute is identical with accompanying drawing 1 illustrated embodiment one, and difference is the first power diode D 1negative electrode connect the first filter inductance L 1an end, the first power diode D 1anodic bonding the 5th power switch tube S 5emitter, the 5th power switch tube S 5collector electrode connect the second filter inductance L 2an end.
Referring to Fig. 3, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment tri-, and its electric circuit constitute is identical with accompanying drawing 1 illustrated embodiment one, but its circuit connecting relation is, input capacitance C dcanode connect respectively solar cell positive output end, the first power switch tube S 1drain electrode, the 3rd power switch tube S 3drain electrode, input capacitance C dcnegative terminal connect respectively solar cell negative output terminal, the second power switch tube S 2source electrode, the 4th power switch tube S 4source electrode; The first power switch tube S 1source electrode connect respectively the 5th power switch tube S 5collector electrode, the first power diode D 1negative electrode, the second power switch tube S 2drain electrode connect respectively the 5th power switch tube S 5emitter, the second power diode D 2anode, the first filter inductance L 1an end, the 3rd power switch tube S 3source electrode connect respectively the 4th power switch tube S 4drain electrode, the first power diode D 1anode, the 6th power switch tube S 6emitter, the second filter inductance L 2an end, the 6th power switch tube S 6collector electrode connect the second power diode D 2negative electrode; The first filter inductance L 1the other end connect respectively filter capacitor C oan end, electrical network v gan end, the second filter inductance L 2the other end connect respectively filter capacitor C othe other end, electrical network v gthe other end.
Referring to Fig. 4, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment tetra-, and its electric circuit constitute is identical with accompanying drawing 3 illustrated embodiments three, but the 6th power switch tube S 6collector electrode connect the first filter inductance L 1an end, the 6th power switch tube S 6emitter connect the second power diode D 2anode, the second power diode D 2negative electrode connect the second filter inductance L 2an end.
Referring to Fig. 5, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment five, and its electric circuit constitute is identical with accompanying drawing 1 illustrated embodiment one, but its circuit connecting relation is, input capacitance C dcanode connect respectively solar cell positive output end, the first power switch tube S 1drain electrode, the 3rd power switch tube S 3drain electrode, input capacitance C dcnegative terminal connect respectively solar cell negative output terminal, the second power switch tube S 2source electrode, the 4th power switch tube S 4source electrode; The first power switch tube S 1source electrode connect respectively the second power switch tube S 2drain electrode, the 5th power switch tube S 5collector electrode, the second power diode D 2negative electrode, the first filter inductance L 1an end, the 3rd power switch tube S 3source electrode connect respectively the first power diode D 1negative electrode, the 6th power switch tube S 6collector electrode, the second filter inductance L 2an end, the 4th power switch tube S 4drain electrode connect respectively the second power diode D 2anode, the 6th power switch tube S 6emitter, the 5th power switch tube S 5emitter connect the first power diode D 1anode; The first filter inductance L 1the other end connect respectively filter capacitor C oan end, electrical network v gan end, the second filter inductance L 2the other end connect respectively filter capacitor C othe other end, electrical network v gthe other end.
Referring to Fig. 6, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment six, and its electric circuit constitute is identical with accompanying drawing 5 illustrated embodiments five, but the first power diode D 1anodic bonding the first filter inductance L 1an end, the first power diode D 1negative electrode connect the 5th power switch tube S 5collector electrode, the 5th power switch tube S 5emitter connect the second filter inductance L 2an end.
Referring to Fig. 7, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment seven, and its electric circuit constitute is identical with accompanying drawing 1 illustrated embodiment one, but its circuit connecting relation is, input capacitance C dcanode connect respectively solar cell positive output end, the first power switch tube S 1drain electrode, the 3rd power switch tube S 3drain electrode, input capacitance C dcnegative terminal connect respectively solar cell negative output terminal, the second power switch tube S 2source electrode, the 4th power switch tube S 4source electrode; The first power switch tube S 1source electrode connect respectively the 5th power switch tube S 5collector electrode, the second power diode D 2negative electrode, the first filter inductance L 1an end, the second power switch tube S 2drain electrode connect respectively the 5th power switch tube S 5emitter, the first power diode D 1anode, the 3rd power switch tube S 3source electrode connect respectively the 4th power switch tube S 4drain electrode, the first power diode D 1negative electrode, the 6th power switch tube S 6collector electrode, the second filter inductance L 2an end, the 6th power switch tube S 6emitter connect the second power diode D 2anode; The first filter inductance L 1the other end connect respectively filter capacitor C oan end, electrical network v gan end, the second filter inductance L 2the other end connect respectively filter capacitor C othe other end, electrical network v gthe other end.
Referring to Fig. 8, it is depicted as single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment eight, and its electric circuit constitute is identical with accompanying drawing 7 illustrated embodiments seven, but the 5th power switch tube S 5collector electrode connect the first filter inductance L 1an end, the 5th power switch tube S 5emitter connect the first power diode D 1anode, the first power diode D 1negative electrode connect the second filter inductance L 2an end.
Accompanying drawing 9 is drive principle work waves of single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment mono-, the first power switch tube S 1with the 4th power switch tube S 4the driving signal is identical, and at the positive half cycle of grid current, by Unipolar SPWM mode high-frequency work, negative half period turn-offs; The second power switch tube S 2with the 3rd power switch tube S 3the driving signal is identical, at the positive half cycle of grid current, turn-offs, and negative half period is by Unipolar SPWM mode high-frequency work; The 5th power switch tube S 5the driving signal logical at positive semi-perimeter, negative half period turn-offs; The 6th power switch tube S 6the driving signal long logical at negative half period, positive half cycle turn-offs.
Accompanying drawing 10 is each switch mode equivalent circuit diagrams of single-phase asymmetric full-bridge non-isolated grid-connected inverter circuit topology embodiment mono-.
Mode 1: equivalent electric circuit as shown in Figure 10 a, the first, the 4th, the 5th power switch pipe conducting, other power switch pipe turn-offs, the 5th power switch tube S 5the driving signal is arranged, but do not have electric current to flow through, grid current flows through the first power switch tube S successively 1, the first filter inductance L 1, electrical network v g, the second filter inductance L 2, the 4th power switch tube S 4;
Mode 2: equivalent electric circuit as shown in Figure 10 b, the 5th power switch pipe conducting, other power switch pipe turn-offs, by the 5th power switch tube S 5with the first power diode D 1form continuous current circuit, the continuous current circuit current potential is approximately the photovoltaic cell voltage U pVhalf;
Mode 3: equivalent electric circuit as shown in Figure 10 c, second, third, the 6th power switch pipe conducting, other power switch pipe turn-offs, grid current flows through the 3rd power switch tube S successively 3, the 6th power switch tube S 6, the second filter inductance L 2, electrical network v g, the first filter inductance L 1, the second power switch tube S 2;
Mode 4: equivalent electric circuit as shown in Figure 10 d, the 6th power switch tube S 6conducting, other power switch pipe turn-offs, by the 6th power switch tube S 6with the second power diode D 2form continuous current circuit, the continuous current circuit current potential is approximately the photovoltaic cell voltage U pVhalf.
Above demonstration and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (9)

1. single-phase asymmetric full-bridge non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, described single-phase asymmetric full-bridge non-isolated grid-connected inverter comprises input capacitance branch road (1) and network access filter branches (3), it is characterized in that, described single-phase asymmetric full-bridge non-isolated grid-connected inverter also comprises full-bridge switch unit (2), described input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively, and described full-bridge switch unit (2) comprises the first power switch pipe (S 1), the second power switch pipe (S 2), the 3rd power switch pipe (S 3), the 4th power switch pipe (S 4), the 5th power switch pipe (S 5), the 6th power switch pipe (S 6), the first power diode (D 1), the second power diode (D 2).
2. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the 5th power switch pipe (S 5) emitter, the second power diode (D 2) anode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 6th power switch pipe (S 6) collector electrode and the second power diode (D 2) negative electrode, the 4th power switch pipe (S 4) drain electrode connect respectively the first power diode (D 1) anode, the 6th power switch pipe (S 6) emitter, the second filter inductance (L 2) an end, the 5th power switch pipe (S 5) collector electrode connect the first power diode (D 1) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
3. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the first power diode (D 1) negative electrode, the second power diode (D 2) anode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 6th power switch pipe (S 6) collector electrode, the second power diode (D 2) negative electrode, the 4th power switch pipe (S 4) drain electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the 6th power switch pipe (S 6) emitter, the second filter inductance (L 2) an end, the 5th power switch pipe (S 5) emitter connect the first power diode (D 1) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
4. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the first power diode (D 1) negative electrode, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the second power diode (D 2) anode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) anode, the 6th power switch pipe (S 6) emitter, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) collector electrode connect the second power diode (D 2) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
5. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the first power diode (D 1) negative electrode, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the 6th power switch pipe (S 6) collector electrode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) anode, the second power diode (D 2) negative electrode, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) emitter connect the second power diode (D 2) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
6. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the 5th power switch pipe (S 5) collector electrode, the second power diode (D 2) negative electrode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the first power diode (D 1) negative electrode, the 6th power switch pipe (S 6) collector electrode, the second filter inductance (L 2) an end, the 4th power switch pipe (S 4) drain electrode connect respectively the second power diode (D 2) anode, the 6th power switch pipe (S 6) emitter, the 5th power switch pipe (S 5) emitter connect the first power diode (D 1) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
7. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the second power switch pipe (S 2) drain electrode, the first power diode (D 1) anode, the second power diode (D 2) negative electrode, the first filter inductance (L 1) an end, the 3rd power switch pipe (S 3) source electrode connect respectively the 5th power switch pipe (S 5) emitter, the 6th power switch pipe (S 6) collector electrode, the second filter inductance (L 2) an end, the 4th power switch pipe (S 4) drain electrode connect respectively the second power diode (D 2) anode, the 6th power switch pipe (S 6) emitter, the 5th power switch pipe (S 5) collector electrode connect the first power diode (D 1) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
8. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the second power diode (D 2) negative electrode, the first filter inductance (L 1) an end, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the first power diode (D 1) anode, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) negative electrode, the 6th power switch pipe (S 6) collector electrode, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) emitter connect the second power diode (D 2) anode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
9. single-phase asymmetric full-bridge non-isolated grid-connected inverter according to claim 1, is characterized in that, described input capacitance branch road (1) comprises input capacitance (C dc); Network access filter branches (3) comprises the first filter inductance (L 1), the second filter inductance (L 2), filter capacitor (C o); Described input capacitance (C dc) anode connect respectively solar cell positive output end, the first power switch pipe (S 1) drain electrode, the 3rd power switch pipe (S 3) drain electrode, input capacitance (C dc) negative terminal connect respectively solar cell negative output terminal, the second power switch pipe (S 2) source electrode, the 4th power switch pipe (S 4) source electrode; The first power switch pipe (S 1) source electrode connect respectively the 5th power switch pipe (S 5) collector electrode, the 6th power switch pipe (S 6) emitter, the first filter inductance (L 1) an end, the second power switch pipe (S 2) drain electrode connect respectively the 5th power switch pipe (S 5) emitter, the first power diode (D 1) anode, the 3rd power switch pipe (S 3) source electrode connect respectively the 4th power switch pipe (S 4) drain electrode, the first power diode (D 1) negative electrode, the second power diode (D 2) anode, the second filter inductance (L 2) an end, the 6th power switch pipe (S 6) collector electrode connect the second power diode (D 2) negative electrode; The first filter inductance (L 1) the other end connect respectively filter capacitor (C o) an end, electrical network (v g) an end, the second filter inductance (L 2) the other end connect respectively filter capacitor (C o) the other end, electrical network (v g) the other end.
CN2011104101968A 2011-12-09 2011-12-09 Single phase asymmetrical full-bridge non-isolated photovoltaic grid-connected inverter Pending CN103166495A (en)

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CN105471296B (en) * 2015-11-27 2019-01-11 深圳市美克能源科技股份有限公司 Inverter circuit
CN110601160A (en) * 2019-09-19 2019-12-20 散裂中子源科学中心 High-energy feedback type load energy backflow discharge circuit and energy discharge method thereof
CN110601160B (en) * 2019-09-19 2021-10-29 散裂中子源科学中心 High-energy feedback type load energy backflow discharge circuit and energy discharge method thereof

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