CN102739087A - Synchronous follow current inverter topology without common-mode interference - Google Patents

Synchronous follow current inverter topology without common-mode interference Download PDF

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Publication number
CN102739087A
CN102739087A CN2012102036808A CN201210203680A CN102739087A CN 102739087 A CN102739087 A CN 102739087A CN 2012102036808 A CN2012102036808 A CN 2012102036808A CN 201210203680 A CN201210203680 A CN 201210203680A CN 102739087 A CN102739087 A CN 102739087A
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China
Prior art keywords
switch
chopping
topology
chopping switch
ripple inductance
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Pending
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CN2012102036808A
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Chinese (zh)
Inventor
张永
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FENGZHI (SHANGHAI) NEW ENERGY TECHNOLOGY Co Ltd
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FENGZHI (SHANGHAI) NEW ENERGY TECHNOLOGY Co Ltd
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Priority to CN2012102036808A priority Critical patent/CN102739087A/en
Publication of CN102739087A publication Critical patent/CN102739087A/en
Priority to PCT/CN2012/001417 priority patent/WO2013134904A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

A synchronous follow current inverter topology without common-mode interference realizes the high-efficiency inversion of electric energy from direct current to alternating current with lower cost, and meanwhile, the topology is free of the problem of common-mode interference, and the synchronous follow current inverter topology can be conveniently applicable to an inversion system without isolation transformers. The topology adopts the following principle: high-frequency chopping switches are arranged at the positive end and the negative end of the direct current input side and are switched on and off simultaneously, and the duty cycle of switching of the high-frequency chopping switches is modulated to realize the amplitude change of the output voltage; the rear stage of each high-frequency chopping switch is connected with a flat wave inductor, one side of each flat wave inductor is connected with the chopping switch and is also provided with a follow current circuit with a follow current switch, and the follow current of each flat wave inductor is ensured when the chopping switch is switched off; the rear stage of each inductor is provided with an H reversing bridge, and the H reversing bridges carry out reversing according to the frequency of the expected output of an inverter, so that the inversion is realized. With the topology, the switching voltage of a switching tube is reduced, the switching loss of the system is reduced, meanwhile, the topology is free of the problem of common-mode interference, and is applicable to an inversion system without transformers.

Description

No common mode disturbances synchronous freewheeling inverter topology
Technical field
The invention belongs to electric power unsteady flow field, is a kind of topological structure that is transformed into direct current alternating current, needing can be widely used in common mode current to suppress in the demanding inverter, such as the photovoltaic DC-to-AC converter of non-isolation, wind power generation inverter etc.
Background technology
Along with industrial expansion to the inverter conversion efficiency require increasingly high, especially in industries such as generation of electricity by new energy, intelligent grid, flexible alternating current-direct current transmissions of electricity.The deciding factor of inverter efficiency is the topological structure of inverter, and the quality of topological structure has determined the efficient and the cost of inverter.The inverter that many application scenarios are arranged, for example photovoltaic combining inverter often adopts isolated form input side and the outlet side of being with transformer, the electrical isolation between such two side systems, thus personnel protection is provided and has avoided the leakage current between the both sides.Yet, because the loss of transformer so reduced the efficient of system, has also increased cost simultaneously.In order to overcome the above-mentioned deficiency that the isolated form inverter of transformer is arranged, can select transformerless non-isolation type inverter topology.The outstanding advantage of transless inverter topology is that efficient is high, and whole cost is low.But transformerless inversion topological is not because the input and output side has isolation, so occur the high frequency common mode leakage current between the both sides easily.Existing topological structure can be applicable to the fewer of transless inverter, and shortcoming is separately all arranged.H bridge type inverse topology such as traditional has bipolarity modulation system and unipolarity modulation system; If use the bipolarity modulation system, though there is not the high frequency common mode leakage problem, its switching loss is high, and conversion efficiency is low; If use the unipolarity modulation system to have the common mode leakage problem.So, design of High Efficiency rate, low cost, and it is just extremely important not have the topology of common mode leakage current.
Summary of the invention
The present invention proposes a kind of inversion topological structure, the realization of innovation high efficiency and do not have the electric energy inversion of common mode leakage current.
Topological structure (with reference to figure 1 and Fig. 2) and principle that the present invention proposes are:
The switching tube (claim that here these two switching tubes are chopping switch, claim that with the anodal chopping switch that is connected be S5, the chopping switch that title is connected with negative pole is S6) of respectively connecting on the direct current input both positive and negative polarity; Chopping switch S5 and S6 respectively go here and there the back inductance (claim that here these two inductance are flat ripple inductance, claim that the flat ripple inductance that is connected with chopping switch S5 is L1, title is L2 with the flat ripple inductance of chopping switch S6 connection); Two flat ripple inductance are connected with the synchronous freewheeling circuit with being connected of chopping switch between the side, the conducting direction of synchronous freewheeling circuit is from the node between chopping switch S6 and the flat ripple inductance L 2 to chopping switch S5 and the node the flat ripple inductance L 1; (being called for short this H type bridge that commutates is the H bridge to connect the H type switching-over bridge is made up of four switching tubes between the other side of two flat ripple inductance L 1 and L2; Claim that two switching tubes that are connected with flat ripple inductance L 1 in the H bridge are S1 and S3; Claim that two switching tubes that are connected with flat ripple inductance L 2 in the H bridge are S2 and S4; S1 and S2 form a brachium pontis, and S3 and S4 form a brachium pontis); In order to improve performance; Can connect flat wave capacitor (claiming that here this electric capacity is C3) between parallelly connected flat wave capacitor (claiming that here this electric capacity is C2) and the H bridge output point (i.e. two brachium pontis mid points) on the two ends of H bridge input; Flat wave capacitor C2 and C3 needn't two must want; At least need one of them, not so have bigger electromagnetic radiation; Two brachium pontis mid points of H bridge are the output that inversion exchanges, certainly in the practical application thereafter level also to increase the EMC filter circuit, the EMC filter circuit does not draw in Fig. 1 and Fig. 2, because this is not a category of the present invention.
The synchronous freewheeling circuit of flat ripple inductance L 1 and L2 has two kinds, and a kind of is single synchro switch freewheeling circuit, and a kind of is two synchro switch pipe freewheeling circuits.Single synchro switch pipe afterflow mode is directly between two flat ripple inductance and chopping switch junction, to be connected a continued flow switch pipe (S7 among Fig. 1), its conducting direction be from the junction between the chopping switch peace ripple inductance of direct current input negative pole to the junction the peaceful ripple inductance of chopping switch at direct current input positive pole.Two synchro switch pipe afterflow modes are: at dc supply input series connection two electric capacity (C10 among Fig. 2, C11); Between two flat ripple inductance and chopping switch junction, be connected two continued flow switch pipes of series connection (circuit of S8 among Fig. 2 and S9 composition); Mid point between two electric capacity links to each other with the mid point between two continued flow switch, the conducting direction of two series connection synchronous freewheeling switches be from the junction between the chopping switch peace ripple inductance of direct current input negative pole to the junction the anodal chopping switch peace ripple inductance of direct current input.The benefit of two synchro switch afterflow modes is that chopping switch is had the voltage clamp defencive function, can adopt the withstand voltage switching tube of 1/2nd Vin just passable.
When system works, two chopping switch S5 and S6 be HF switch simultaneously, and they are opened simultaneously or turn-off simultaneously; Synchronous freewheeling switch S 7 or S8 and S9 are with chopping switch opposite phases HF switch; When S5 and S6 opened, synchronous freewheeling switch S 7 or S8 and S9 turn-offed, and input voltage vin is charged to late-class circuit; When S5 and S6 disconnection, synchronous freewheeling switch S 7 or S8 and S9 are open-minded, and the electric current of flat ripple inductance L 1 and L2 is through synchronous freewheeling switch S 7 or S8 and S9 afterflow; Through the duty cycle of switching of modulation chopping switch S5 and S6, the voltage magnitude fluctuation of adjustment inverter output; The frequency that H switching-over bridge need be exported with inversion commutates, and realizes exchanging the reversal of output; When expectation output AC positive half wave, turn-off S1 and S4, open S2 and S3; When expecting the negative half-wave of output AC, turn-off S2 and S3, open S1 and S4.
The invention has the beneficial effects as follows:
Beneficial effect one though the switching tube quantity of usefulness has been Duoed than the conventional full bridge inversion topological, has improved system effectiveness, and has reduced cost.Because reduced the switching voltage and the rated voltage requirement of switching tube, adopted the circuit of synchronous freewheeling simultaneously, reduced the afterflow loss of system.The switching voltage of chopping switch S5 and S6 and blocking voltage all are Vin/2; The switching voltage of reversing switch S1, S2, S3 and S4 is zero in the H bridge, and their blocking voltage is Vout.Require Vin little much to the voltage request of each switching tube than the switch tube voltage of conventional bridge in the topology of the present invention, so the rated voltage of selector switch pipe is low when adopting the present invention to design inverter, so cost is low.The reduction of switching voltage can reduce the switching loss of system; The requirement of switching tube rated voltage reduces, and can greatly reduce the cost of switching tube.
Beneficial effect two, this topology does not have high frequency common mode to disturb output from principle, so there is not the high frequency common mode leakage problem, when having improved electromagnetic compatibility, can be applied to does not easily have in the inversion system of isolating transformer.
Description of drawings
This specification has six accompanying drawings:
Fig. 1 adopts the no common mode disturbances synchronous freewheeling inverter topology of single continued flow switch;
Fig. 2 adopts the no common mode disturbances synchronous freewheeling inverter topology of two continued flow switch of clamper function with voltage;
Fig. 3, the on off state one when inverter output AC positive half wave;
Fig. 4, the on off state two when inverter output AC positive half wave;
Fig. 5, the on off state one when the inverter output AC is born half-wave;
Fig. 6, the on off state two when the inverter output AC is born half-wave.
Embodiment
On off state when Fig. 3, Fig. 4, Fig. 5, Fig. 6 are to use the work of the inverter example that inversion topological of the present invention realizes.Fig. 3 and Fig. 4 are the situation when inverter output AC positive half wave, and Fig. 5 and Fig. 6 are the situation when the inverter output AC is born half-wave.When inverter output AC positive half wave, reversing switch S2 and S3 remain on opening state; Reversing switch S1 and S4 remain on off state, and their blocking voltage is Vout.When the inverter output AC was born half-wave, reversing switch S1 and S4 remained on opening state; Reversing switch S2 and S3 remain on off state, and their blocking voltage is Vout.Chopping switch S5 and S6 be HF switch simultaneously, and synchronous freewheeling switch S 7 adopts and chopping switch S5 and the synchronous HF switch of S6 opposite phases.Fig. 3 and Fig. 5 are that chopping switch is opened the situation when turn-offing with continued flow switch, and Fig. 4 and Fig. 6 are that chopping switch turn-offs and the situation of continued flow switch when opening.When chopping switch S5 and S6 open, electric energy from direct current input Vin backward level transmit, at this moment continued flow switch S7 turn-offs; When chopping switch S5 and S6 turn-offed, the electric current among flat ripple inductance L 1 and the L2 was through the continued flow switch afterflow, the Vin/2 during voltage on chopping switch S5 and S6 right side at this moment, and the voltage stress of S5 and S6 is Vin/2.Through the duty cycle of switching of modulation S5, S6, S7, the voltage magnitude of control inversion output changes; Through the reversal of reversing switch S1, S2, S3, S4 control inversion output, thereby realize sinusoidal wave inversion.Because the common-mode voltage when S5 and S6 open simultaneously between direct current input side and the interchange outlet side; And the common-mode voltage when S5 and S6 turn-off simultaneously between DC side and the AC side does not change; So problem that this topology does not have high frequency common mode to disturb theoretically; Improve the EMC performance of system greatly, and can be used for the inversion system that transless is isolated easily.

Claims (5)

1. there is not common mode disturbances synchronous freewheeling inverter topology; Realized that be alternating current to dc inverter; It is characterized in that on positive pole and the negative pole of direct-flow input end a chopping switch being arranged respectively; This two chopping switch back respectively connects a flat ripple inductance, and at the freewheeling circuit that has the synchro switch pipe to constitute between being connected of two chopping switch and flat ripple inductance, the back of two flat ripple inductance connects the H type bridge that commutates.
2. no common mode disturbances synchronous freewheeling inverter topology according to claim 1 is characterized in that its synchronous freewheeling circuit has two kinds of realizations, promptly adopts single synchro switch pipe freewheeling circuit or two synchro switch pipe freewheeling circuit.
3. according to claim 1 and the described high efficiency inverter topology of claim 2; It is characterized in that described single synchro switch pipe freewheeling circuit is between two flat ripple inductance and chopping switch junction, to be connected a continued flow switch pipe, its conducting direction be from the junction between the chopping switch peace ripple inductance of direct current input negative pole to the junction the anodal chopping switch peace ripple inductance of direct current input.
4. according to claim 1 and the described high efficiency inverter topology of claim 2; It is characterized in that described pair of synchro switch pipe freewheeling circuit is at two electric capacity of dc supply input series connection; Between the junction of two flat ripple inductance and chopping switch, be connected two continued flow switch pipes of series connection; Mid point between two electric capacity links to each other with the mid point between two continued flow switch pipes, the conducting direction of two series connection continued flow switch pipes be from the junction between the chopping switch peace ripple inductance of direct current input negative pole to the junction the anodal chopping switch peace ripple inductance of direct current input.
5. high efficiency inverter topology according to claim 1 is characterized in that its two chopping switch while high frequencies are opened or turn-offed, and its synchronous freewheeling switch is with chopping switch opposite phases HF switch.
CN2012102036808A 2012-03-12 2012-06-12 Synchronous follow current inverter topology without common-mode interference Pending CN102739087A (en)

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CN2012102036808A CN102739087A (en) 2012-06-12 2012-06-12 Synchronous follow current inverter topology without common-mode interference
PCT/CN2012/001417 WO2013134904A1 (en) 2012-03-12 2012-10-23 Single-phase inverter topology without common-mode interference

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013134904A1 (en) * 2012-03-12 2013-09-19 丰郅(上海)新能源科技有限公司 Single-phase inverter topology without common-mode interference
WO2014086083A1 (en) * 2012-12-07 2014-06-12 丰郅(上海)新能源科技有限公司 Bidirectional converter topology
CN104124867A (en) * 2013-04-26 2014-10-29 丰郅(上海)新能源科技有限公司 Two-way direct-current converter topology
CN104124866A (en) * 2013-04-26 2014-10-29 丰郅(上海)新能源科技有限公司 Step-on and step-down two-way direct-current converter topology
CN105553308A (en) * 2016-03-11 2016-05-04 苏州爱科博瑞电源技术有限责任公司 Inverter circuit and inversion device
CN110071652A (en) * 2019-06-17 2019-07-30 西南石油大学 A kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system
CN111064415A (en) * 2018-09-30 2020-04-24 广东威灵汽车部件有限公司 Motor control device, method and system and vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005047373A1 (en) * 2005-09-28 2007-04-05 Schekulin, Dirk, Dr. Ing. Low-setting plate circuit consists of input and output connections with main branches between them as well as input-side condenser and output-side diode series connections
US20090316458A1 (en) * 2006-07-31 2009-12-24 Ingeteam Energy, S.A. Single-phase inverter circuit to condition and transform direct current electric power into alternating current electric power
CN102130623A (en) * 2011-04-12 2011-07-20 江苏斯达工业科技有限公司 Improved main circuit structure of photovoltaic synchronization inverter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005047373A1 (en) * 2005-09-28 2007-04-05 Schekulin, Dirk, Dr. Ing. Low-setting plate circuit consists of input and output connections with main branches between them as well as input-side condenser and output-side diode series connections
US20090316458A1 (en) * 2006-07-31 2009-12-24 Ingeteam Energy, S.A. Single-phase inverter circuit to condition and transform direct current electric power into alternating current electric power
CN102130623A (en) * 2011-04-12 2011-07-20 江苏斯达工业科技有限公司 Improved main circuit structure of photovoltaic synchronization inverter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013134904A1 (en) * 2012-03-12 2013-09-19 丰郅(上海)新能源科技有限公司 Single-phase inverter topology without common-mode interference
WO2014086083A1 (en) * 2012-12-07 2014-06-12 丰郅(上海)新能源科技有限公司 Bidirectional converter topology
CN103872940A (en) * 2012-12-07 2014-06-18 丰郅(上海)新能源科技有限公司 Bi-directional converting topology
CN104124867A (en) * 2013-04-26 2014-10-29 丰郅(上海)新能源科技有限公司 Two-way direct-current converter topology
CN104124866A (en) * 2013-04-26 2014-10-29 丰郅(上海)新能源科技有限公司 Step-on and step-down two-way direct-current converter topology
CN105553308A (en) * 2016-03-11 2016-05-04 苏州爱科博瑞电源技术有限责任公司 Inverter circuit and inversion device
CN111064415A (en) * 2018-09-30 2020-04-24 广东威灵汽车部件有限公司 Motor control device, method and system and vehicle
CN111064415B (en) * 2018-09-30 2021-05-18 广东威灵汽车部件有限公司 Motor control device, method and system and vehicle
CN110071652A (en) * 2019-06-17 2019-07-30 西南石油大学 A kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system

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