CN102594189A - Non-isolated direct-current converter type differential three-level inverter - Google Patents

Non-isolated direct-current converter type differential three-level inverter Download PDF

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CN102594189A
CN102594189A CN2012100546030A CN201210054603A CN102594189A CN 102594189 A CN102594189 A CN 102594189A CN 2012100546030 A CN2012100546030 A CN 2012100546030A CN 201210054603 A CN201210054603 A CN 201210054603A CN 102594189 A CN102594189 A CN 102594189A
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power switch
switch pipe
negative pole
output
input filter
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马锋
李磊
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Abstract

The invention discloses a non-isolated direct-current converter type differential three-level inverter. The circuit structure of the inverter consists of a power supply, an input filter, two bidirectional three-level direct-current converters, an output filter and an alternating current load, wherein the bidirectional three-level direct-current converters are connected in a differential way, i.e. input ends are connected in parallel and output ends are connected in series. By the inverter, the function of converting unstable and low-quality direct-current voltage into stable and high-quality sine alternating-current voltage as required can be realized. A circuit topology family of non-isolated direct-current converter type differential three-level inverters, including Boost type, Buck type, Buck-Boost type, Cuk type, Sepic type and Zeta type, is obtained by changing the type of the bidirectional three-level direct-current converters. The inverter has the characteristics of simple circuit topology, capability of adapting to wider voltage input range, bidirectional power current, single-stage conversion, small volume, light weight, low cost, simple control, high conversion rate, high load adaptability, high dynamic performance and the like, and is applied to a high-voltage input occasion.

Description

The differential three-level inverter of a kind of non-isolated DC converter type
Technical field
The invention belongs to the Technics of Power Electronic Conversion technical field, the differential three-level inverter of particularly a kind of non-isolated DC converter type.
Background technology
The DC-AC inversion transformation technique is a power semiconductor device applications; Direct current energy is converted to a kind of static ac dc converter device of the simple alternating current electric energy of fixed frequency or frequency adjustable; The confession AC load is used, and is widely used in national defence, industrial and mining enterprises, scientific research institutions, laboratory in colleges and universities and the daily life.
At present, domestic and international power electronics researcher mainly concentrates on two aspects for the research of DC-AC inverter.The one, to the research of two level DC-AC converters such as non-electrical isolation formula, low frequency and high frequency electrical isolation formula; The 2nd, to the research of multi-electrical level inverter.Multi-electrical level inverter has advantages such as switch tube voltage stress is low, harmonic wave of output voltage is little, rapid dynamic response speed; After people such as A.Nabae in 1980 propose; Attract numerous scholars' research interest, successively proposed diode, striding capacitance type and cascade multilevel inverter.But traditional three-level inverter can only be realized the function of step-down, if will realize boosting or the function of buck, needs to adopt two-stage or multistage form, causes shortcomings such as circuit topological structure is complicated, loss is high, and efficient is low.
S.Cuk etc. have proposed Cuk DC converter type inverter (" A conceptually new high-frequency switched-mode amp [Li] fier technique e [Li] minates current ripple "; Proc.Fifth National So [Li] d-State Power Conversion Conf.1978, pp.G3.1～G3.22).This inverter is by two identical Cuk DC converter input parallel connections, and output is in series, and can adapt to the input voltage range of broad, has realized single-stage power conversion, bidirectional power flow, and can realize the function of buck.Ramon Caceres has proposed Boost DC converter type inverter afterwards; Some other scholar has also proposed Buck DC converting type, Buck-boost DC converter inverter in succession; Though above-mentioned inverter has more advantage; But they are two-level inverter, and in high voltage transformation of electrical energy occasion, have defectives such as switching voltage stress is high, harmonic wave of output voltage content is high, loss is big, energy storage original paper volume is big.
Summary of the invention
The object of the present invention is to provide that a kind of circuit topology is succinct, input voltage range, bidirectional power flow, the single-stage conversion that can adapt to broad, volume is little, in light weight, cost is low, control is simple, conversion efficiency is high, the adaptive load ability is strong; Dynamic property is good, is applicable to the differential three-level inverter of non-isolated DC converter type of high voltage input occasion.
The technical solution that realizes the object of the invention is: the differential three-level inverter of a kind of non-isolated DC converter type, form by the high-voltage DC power supply that connects successively, input filter inductance, input filter capacitor, two identical bidirectional three-level DC converters and AC load; Wherein, two non-isolation type bidirectional three-level DC converter input parallel connections, output series connection; The positive pole of input high-voltage DC power supply is connected with an end of input filter inductance; The other end of input filter inductance is connected with two bidirectional three-level DC converters, input filter capacitors respectively; The other end of this input filter capacitor is connected with input high-voltage DC power supply negative pole, two bidirectional three-level DC converters respectively; Described input filter inductance and input filter capacitor constitute input filter, and this input filter carries out filtering to the input high-voltage DC power supply; Described two bidirectional three-level DC converters will be converted into three level output voltages through the filtered input voltage of input filter, and the first bidirectional three-level DC converter is all pressed the clamping capacitance and first output filter capacitor by first energy storage inductor, first power switch pipe, second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, first; The second bidirectional three-level DC converter all presses the clamping capacitance and second output filter capacitor to form by energy storage inductor, the 5th power switch pipe, the 6th power switch pipe, the 7th power switch pipe, the 8th power switch pipe, second; In the bidirectional three-level DC converter, an end of first energy storage inductor is connected with input filter, and the other end is connected with the 3rd switching tube with first power switch pipe respectively; The other end of first power switch pipe all presses clamping capacitance to be connected with second power switch pipe and first respectively; The other end of second power switch pipe is connected with the 4th power switch pipe, the other end of the 4th power switch pipe respectively with first output filter capacitor, an end of first output filter capacitor is connected with an end of output AC load; In the bidirectional three-level DC converter, an end of second energy storage inductor links to each other with input filter, and the other end is connected with the 7th power switch pipe with the 5th power switch pipe respectively; The other end of the 5th power switch pipe all presses clamping capacitance to be connected with the 6th power switch pipe and second respectively; The other end of the 6th power switch pipe is connected with input filter; Second all presses clamping capacitance to be connected with the 8th power switch pipe with the other end of the 7th power switch pipe respectively, and the other end of the 8th power switch pipe is connected with second output filter capacitor respectively; One end of second output filter capacitor is connected with the other end of output AC load; Two DC converter outputs have identical direct current biasing, and frequency is identical, the sinusoidal voltage that the phase phasic difference is 180 °, and the difference of the two is output voltage u 0
The present invention compared with prior art; Its remarkable advantage: the present invention realizes the be incorporated into the power networks basis of reliable inversion of new forms of energy such as fuel cell, storage battery, solar energy, is the basis of realizing key technologies such as direct current transportation in the electric power system, reactive power compensation, active power filter.With respect to traditional three-level inverter; The differential three-level inverter of non-isolated DC converter type is owing to introduced difference structure; Can adapt to wideer input voltage range, can realize the function that the single-stage ascending, descending is pressed, improve conversion efficiency, power density and reliability; With respect to traditional two-level inverter; Owing to introduced three Level Technology; This quasi-converter can be applicable to high pressure DC-AC conversion occasion, reduces switch stress and energy loss, and can improve the spectral characteristic of output voltage; Thereby reduce the volume and weight of output filter, improve the output waveform quality.Therefore, the present invention has widened the application scenario of three level DC-AC inverters greatly, and the high pressure DC-AC transformation of electrical energy occasion in fields such as civilian, national defence and industry is with a wide range of applications.
Description of drawings
Fig. 1 is the circuit structure diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Fig. 2 is the Boost type topological diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Fig. 3 is the Buck type topological diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Fig. 4 is the Buck-boost type topological diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Fig. 5 is the Cuk type topological diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Fig. 6 is the Sepic type topological diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Fig. 7 is the Zeta type topological diagram of the differential three-level inverter of the non-isolated DC converter type of the present invention.
Embodiment
The differential three-level inverter of a kind of non-isolated DC converter type of the present invention is made up of the high-voltage DC power supply that connects successively, input filter, two identical non-isolation type bidirectional three-level DC converters and AC load.Wherein, two bidirectional three-level DC converter input parallel connections, output series connection.Can unsettled high pressure, direct current inferior be directly converted to sinusoidal ac stable, high-quality, can realize the function of single-stage buck, reduce Power Conversion progression, realized the circuit structure of single-stage power conversion, promptly import high-voltage DC power supply U iPositive pole and input filter inductance L iAn end connect this input filter inductance L iThe other end respectively with two non-isolation type bidirectional three-level DC converters, input filter capacitor C iBe connected this input filter capacitor C iThe other end respectively with input high-voltage DC power supply U iNegative pole, two bidirectional three-level DC converters are connected, described input filter inductance L iWith input filter capacitor C iConstitute input filter, this input filter is to input high-voltage DC power supply U iCarry out filtering; Described two identical non-isolation type bidirectional three-level DC converter outputs have identical direct current biasing, and frequency is identical, the sinusoidal voltage that the phase phasic difference is 180 °.
In the differential three-level inverter of the non-isolated DC converter type of the present invention, the high-voltage DC power supply U that connects successively i, input filter, two identical non-isolation type bidirectional three-level Boost converters and AC load Z LBe combined into the Boost circuit topology that is applicable to the DC-AC conversion occasion of boosting, i.e. input DC power U iPositive pole and input filter inductance L iAnodal connection, input DC power U iNegative pole and input filter capacitor C iNegative pole, second power switch tube S 12The source electrode and the first output filter capacitor C F1Negative pole be connected and ground connection; Input filter inductance L iNegative pole respectively with the first energy storage inductor L 1Positive pole and input filter capacitor C iPositive pole be connected; Described input filter inductance L iWith input filter capacitor C iConstitute input filter; The first energy storage inductor L 1The negative pole and first power switch tube S 11Drain electrode and the 3rd power switch tube S 13Source electrode be connected; The 3rd power switch tube S 13Drain electrode respectively with the 4th power switch tube S 14Source electrode and first all press clamping capacitance C C1Negative pole be connected; First power switch tube S 11The source electrode and second power switch tube S 12Drain electrode and first all press clamping capacitance C C1Positive pole be connected; The 4th power switch tube S 14The drain electrode and the first output filter capacitor C F1Positive pole be connected and insert load Z LAn end, more than constituted one road bidirectional three-level Boost converter; Input filter inductance L iThe negative pole and the second energy storage inductor L 2Positive pole be connected; The second energy storage inductor L 2Negative pole and the 5th power switch tube S 21Drain electrode and the 7th power switch tube S 23Source electrode be connected; The 5th power switch tube S 21Source electrode respectively with the 6th power open the light the pipe S 22Drain electrode and second all press clamping capacitance C C2Positive pole be connected; The 7th power switch tube S 23Drain electrode and the 8th power switch tube S 24Source electrode and second all press clamping capacitance C C2Negative pole be connected; The 6th power switch tube S 22Source electrode respectively with output filter capacitor C F2Negative pole and input DC power U iNegative pole be connected and ground connection; The 8th power switch tube S 24The drain electrode and the second output filter capacitor C F2Positive pole be connected and insert load Z LThe other end, more than constituted another road bidirectional three-level Boost DC converter; Output filter capacitor C F1, C F2High order harmonic component in the filtering three-level DC converter output voltage obtains having identical direct current biasing in the both sides of AC load, the low-frequency sinusoidal ac voltages u that the phase phasic difference is 180 ° O1, u O2Thereby, obtain high-quality output voltage u o
In the differential three-level inverter of the non-isolated DC converter type of the present invention, the high-voltage DC power supply U that connects successively i, input filter, two identical non-isolation type bidirectional three level Buck converters and AC load Z LBe combined into the Buck circuit topology that is applicable to step-down DC-AC conversion occasion, promptly import high-voltage DC power supply U iPositive pole and input filter inductance L iThe anodal connection, input high-voltage DC power supply U iNegative pole and input filter capacitor C iNegative pole, the 4th power switch tube S 14The source electrode and the first output filter capacitor C F1Negative pole be connected and ground connection; Input filter inductance L iNegative pole respectively with input filter capacitor C iAnodal and second power switch tube S 12Drain electrode link to each other; Described input filter inductance L iWith input filter capacitor C iConstitute input filter, input filter is to the high-voltage DC power supply U of input iCarry out filtering; Second power switch tube S 12The source electrode and the first power switch S 11Drain electrode and first all press clamping capacitance C C1Positive pole be connected; First power switch tube S 11The source electrode and the first output inductor L F1Positive pole, the 3rd power switch tube S 13Drain electrode be connected; The first striding capacitance C C1Negative pole and the 3rd power switch tube S 13Source electrode and the 4th power switch tube S 14Drain electrode be connected; The first output inductor L F1The negative pole and the first output filter capacitor C F1Positive pole be connected and insert load Z LAn end; The above-mentioned first output inductor L F1With the first output filter capacitor C F1Constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O1More than constituted one road bidirectional three-level Buck DC converter; Input filter inductance L iNegative pole and the 6th power switch tube S 22Drain electrode be connected; The 6th power switch tube S 22Source electrode and the 5th power switch tube S 21Drain electrode and second all press clamp C C2Positive pole be connected; The 5th power switch tube S 21Source electrode and the 7th power switch tube S 23The drain electrode and the second output inductor L F2Positive pole be connected; Second all presses clamping capacitance C C2Negative pole and the 7th power switch tube S 23Source electrode and the 8th power switch tube S 24Drain electrode be connected; The 8th power switch tube S 24The source electrode and the second output filter capacitor C F2Negative pole and DC power supply U iNegative pole be connected and ground connection; The second output inductor L F2Negative pole and second output filter capacitor C F2Positive pole be connected and insert load Z LThe other end; The above-mentioned second output inductor L F2With the second output filter capacitor C F2Constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O2More than constituted another road bidirectional three-level Buck converter.
In the differential three-level inverter of the non-isolated DC converter type of the present invention, the high-voltage DC power supply U that connects successively i, input filter, two identical non-isolation type bidirectional three level Buck-boost converters and AC load Z LBe combined into the Buck-boost circuit topology that is applicable to buck DC-AC conversion occasion, promptly import high-voltage DC power supply U iPositive pole and input filter inductance L iThe anodal connection, this U of input high-voltage DC power supply iNegative pole and input filter capacitor C iNegative pole, the first energy storage inductor L 1The negative pole and the first output filter capacitor C F1Negative pole be connected and ground connection; Input filter inductance L iNegative pole respectively with input filter capacitor C iAnodal and second power switch tube S 12Drain electrode link to each other; Described input filter inductance L iWith input filter capacitor C iConstitute input filter, input filter carries out filtering to the high-voltage DC power supply Ui of input; Second power switch tube S 12The source electrode and first power switch tube S 12Drain electrode and first all press clamping capacitance C C1Positive pole be connected; First power switch tube S 11Source electrode respectively with the 3rd power switch tube S 13Drain electrode, the first energy storage inductor L 1Positive pole be connected; The 3rd power switch tube S 13Source electrode and first all press clamping capacitance C C1Negative pole and the 4th power switch tube S 14Drain electrode be connected; The 4th power switch tube S 14The source electrode and the first output filter capacitor C F1Be connected and insert load Z LAn end, more than constituted one road bidirectional three-level Buck-boost DC converter; Input filter inductance L iNegative pole and the 6th power switch tube S 22Drain electrode be connected; The 6th power switch tube S 22Source electrode and the 5th power switch tube S 21Drain electrode and second all press clamping capacitance C C2Positive pole be connected; The 5th power switch tube S 21Source electrode and the 7th power switch tube S 23The drain electrode and the second energy storage inductor L 2Positive pole be connected; The second energy storage inductor L 2Negative pole respectively with the second output filter capacitor C F2Negative pole and direct-current input power supplying U iNegative pole be connected and ground connection; The second striding capacitance C C2Negative pole and the 7th power switch tube S 23Source electrode and the 8th power switch tube S 24Drain electrode be connected; The 8th power switch tube S 24The source electrode and the second output filter capacitor C F2Positive pole be connected and insert load Z LThe other end, more than constituted another road bidirectional three-level Buck-boost converter; Output filter capacitor C F1, C F2High order harmonic component in the filtering three-level DC converter output voltage obtains having identical direct current biasing in the both sides of AC load, the low-frequency sinusoidal ac voltages u that the phase phasic difference is 180 ° O1, u O2Thereby, obtain high-quality output voltage u o
In the differential three-level inverter of the non-isolated DC converter type of the present invention, the high-voltage DC power supply U that connects successively i, input filter, two identical non-isolation type bidirectional three level Cuk converters and AC load group Z LThe synthetic Cuk circuit topology that is applicable to buck DC-AC conversion occasion is promptly imported high-voltage DC power supply U iPositive pole and input filter inductance L iThe anodal connection, input high-voltage DC power supply U iNegative pole and input filter capacitor C iNegative pole, second power switch tube S 12Source electrode, the 4th power switch tube S 14The drain electrode and the first output filter capacitor C F1Negative pole be connected and ground connection; Input filter inductance L iNegative pole respectively with input filter capacitor C iThe anodal and first energy storage inductor L 1Positive pole is connected; Described input filter inductance L iWith input filter capacitor C iConstitute input filter, input filter is to the high-voltage DC power supply U of input iCarry out filtering; The first energy storage inductor L 1The negative pole and first power switch tube S 11The drain electrode and the first storage capacitor C 1Positive pole be connected; First power switch tube S 11Source electrode and first all press clamping capacitance C C1Positive pole, second power switch tube S 12Drain electrode be connected; The first storage capacitor C 1Negative pole and the 3rd power switch tube S 13Source electrode, the first output inductor L F1Positive pole be connected; First all presses clamping capacitance C C1Negative pole and the 3rd power switch tube S 13Drain electrode and the 4th power switch tube S 14Source electrode be connected; The first output inductor L F1The negative pole and the first output filter capacitor C F1Be connected and receive load Z LAn end; The above-mentioned first output inductor L F1With the first output filter capacitor C F1Constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O1More than constituted one road bidirectional three-level Cuk DC converter; Input filter inductance L iThe negative pole and the second energy storage inductor L 2Positive pole be connected; The second energy storage inductor L 2Negative pole and the 5th power switch tube S 21The drain electrode and the second storage capacitor C 2Positive pole be connected the 5th power switch tube S 21Source electrode and the 6th power switch tube S 22Drain electrode and second all press clamping capacitance C C2Positive pole be connected; The second storage capacitor C 2Negative pole and the 7th power switch tube S 23Source electrode, the second output inductor L F2Positive pole be connected; Second all presses clamping capacitance C C2Negative pole and the 7th power switch tube S 23Drain electrode and the 8th power switch tube S 24Source electrode be connected; The 6th power switch tube S 22Source electrode respectively with the 8th power switch tube S 24Drain electrode, the second output filter capacitor C F2Negative pole, input DC power U iNegative pole be connected and ground connection; The second output inductor L F2The negative pole and the second output filter capacitor C F2Positive pole be connected and receive load Z LThe other end; The above-mentioned second output inductor L F2With the second output filter capacitor C F2Constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O2More than constituted another road bidirectional three-level Cuk converter.
In the differential three-level inverter of the non-isolated DC converter type of the present invention, the high-voltage DC power supply U that connects successively i, input filter, two identical non-isolation type bidirectional three level Sepic converters and AC load Z LBe combined into the Sepic circuit topology that is applicable to buck DC-AC conversion occasion, promptly import high-voltage DC power supply U iPositive pole and input filter inductance L iThe anodal connection, input high-voltage DC power supply U iNegative pole and input filter capacitor C iNegative pole, second power switch tube S 12Source electrode, the second energy storage inductor L 12The negative pole and the first output filter capacitor C F1Negative pole be connected and ground connection; Input filter inductance L iNegative pole respectively with input filter capacitor C iThe anodal and first energy storage inductor L 11Positive pole be connected; Described input filter inductance L iWith input filter capacitor C iConstitute input filter, input filter is to the high-voltage DC power supply U of input iCarry out filtering; The first energy storage inductor L 11The negative pole and first power switch tube S 11The drain electrode and the first storage capacitor C 1Positive pole be connected; First power switch tube S 11Source electrode and first all press clamping capacitance C C1Positive pole, second power switch tube S 12Drain electrode be connected; The first storage capacitor C 1Negative pole and the 3rd power switch tube S 13Source electrode, the second energy storage inductor L 12Positive pole be connected; First all presses clamping capacitance C C1Negative pole and the 3rd power switch tube S 13Drain electrode, the 4th power switch tube S 14Source electrode be connected; The 4th power switch tube S 14The drain electrode and the first output filter capacitor C F1Positive pole be connected and receive load Z LAn end, more than constituted one road bidirectional three-level Sepic DC converter; Input filter inductance L iNegative pole and the 3rd energy storage inductor L 21Positive pole be connected; The 3rd energy storage inductor L 21Negative pole and the 5th power switch tube S 21The drain electrode and the second storage capacitor C 2Positive pole be connected the 5th power switch tube S 21Source electrode and the 6th power switch tube S 22The drain electrode and the second striding capacitance C C2Positive pole be connected; The second storage capacitor C 2Negative pole and the 7th power switch tube S 23Source electrode, the 4th energy storage inductor L 22Positive pole be connected; Second all presses clamping capacitance C C2Negative pole and the 7th power switch tube S 23Drain electrode and the 8th power switch tube S 24Source electrode be connected; The 4th energy storage inductor L 22Negative pole and the 6th power switch tube S 22Source electrode, input DC power U iThe negative pole and the second output filter capacitor C F2Negative pole be connected and ground connection; The 8th power switch tube S 24The drain electrode and the second output filter capacitor C F2Positive pole be connected and receive load Z LThe other end more than constituted another road bidirectional three-level Sepic converter; Output filter capacitor C F1, C F2High order harmonic component in the filtering three-level DC converter output voltage obtains having identical direct current biasing in the both sides of AC load, the low-frequency sinusoidal ac voltages u that the phase phasic difference is 180 ° O1, u O2Thereby, obtain high-quality output voltage u o
In the differential three-level inverter of the non-isolated DC converter type of the present invention, the high-voltage DC power supply U that connects successively i, input filter, two identical non-isolation type bidirectional three level Zeta converters and AC load Z LBe combined into the Zeta circuit topology that is applicable to the DC-AC conversion occasion of boosting, promptly import high-voltage DC power supply U iPositive pole and input filter inductance L iThe anodal connection, input high-voltage DC power supply U iNegative pole and input filter capacitor C iNegative pole, the first energy storage inductor L 1Negative pole, the 4th power switch tube S 14The source electrode and the first output filter capacitor C F1Negative pole be connected and ground connection; Input filter inductance L iNegative pole respectively with input filter capacitor C iAnodal and second power switch tube S 12Drain electrode be connected; Described input filter inductance L iWith input filter capacitor C iConstitute input filter, input filter is to the high-voltage DC power supply U of input iCarry out filtering; Second power switch tube S 12The source electrode and first power switch tube S 11Drain electrode and first all press clamping capacitance C C1Positive pole be connected; First power switch tube S 11The source electrode and the first storage capacitor C 1Positive pole be connected; The first storage capacitor C 1The negative pole and the first energy storage inductor L 1Positive pole, the 3rd power switch tube S 13Drain electrode, the first output inductor L F1Positive pole be connected; First all presses clamping capacitance C C1Negative pole and the 3rd power switch tube S 13Source electrode, the 4th power switch tube S 14Drain electrode be connected; The negative pole of first output inductor Lf1 and first output filter capacitor C F1Positive pole be connected and receive load Z LAn end; The above-mentioned first output inductor L F1With the first output filter capacitor C F1Constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O1More than constituted one road bidirectional three-level Zeta DC converter; Input filter inductance L iNegative pole and the 6th power switch tube S 22Drain electrode be connected; The 6th power switch tube S 22Source electrode and the 5th power switch tube S 21Drain electrode, second all press clamping capacitance C C2Positive pole be connected; The 5th power switch tube S 21The source electrode and the second storage capacitor C 2Positive pole be connected; The second storage capacitor C 2The negative pole and the second energy storage inductor L 2Positive pole, the 7th power switch tube S 23Drain electrode and second output inductor L F2Positive pole be connected; Second all presses clamping capacitance C C2Negative pole and the 7th power switch tube S 23Source electrode, the 8th power switch tube S 24Drain electrode be connected; The 8th power switch tube S 24The source electrode and the second energy storage inductor L 2, the second output filter capacitor C F2And input DC power U iNegative pole link to each other and ground connection; The second output inductor L F2The negative pole and the second storage capacitor C F2Positive pole be connected and receive load Z LThe other end; The above-mentioned second output inductor L F2With the second output filter capacitor C F2Constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O2More than constituted another road bidirectional three-level Zeta converter.
Below in conjunction with accompanying drawing the present invention is described in further detail.
In conjunction with Fig. 1, the circuit structure of the non-isolation three-level inverter of the differential DC converter type of the present invention is made up of input high-voltage DC power supply, input filter, two identical non-isolation type bidirectional three-level DC converters and output AC load.This circuit structure can be directly converted to sinusoidal ac stable, high-quality with unsettled high pressure, direct current inferior.The positive pole of input high-voltage DC power supply Ui is connected with the end of input filter inductance Li; The other end of this input filter inductance Li is connected with two bidirectional three-level DC converters, input filter capacitor Ci respectively; The other end of this input filter capacitor Ci is connected with input high-voltage DC power supply Ui negative pole, two bidirectional three-level DC converters respectively; Described input filter inductance Li and input filter capacitor Ci constitute input filter, and this input filter carries out filtering to input high-voltage DC power supply Ui; Described two identical non-isolation type bidirectional three-level DC converter outputs have identical direct current biasing, and frequency is identical, the sinusoidal voltage that the phase phasic difference is 180 °.Both differences are required output sinusoidal voltage uo.Press the DC-AC inverter with respect to traditional ascending, descending, this circuit structure only has single-stage power conversion progression, thereby this quasi-converter can improve input side power factor, conversion efficiency, power density and reliability.Owing to adopted difference structure, such inverter can adapt to wideer input voltage range; Owing to introduced three Level Technology, the voltage stress that each switching tube bore is the half the of two level DC-AC inverters, has reduced the volume and weight of output filter effectively, improves output voltage waveforms and spectral characteristic, improves the output waveform quality.
The basic functional principle of the differential three-level inverter of non-isolated DC converter type is following: according to the requirement of different output voltages; The control of employing voltage and current double closed-loop; Through regulating the duty ratio of two-way DC converter; Can obtain the voltage of Ui, Ui/2, varying level such as 0, again through output filter respectively to its filtering, can so that about two bidirectional three-level DC converters outputs have identical direct current biasing; The sinusoidal voltage that the phase phasic difference is 180 ° is at stable, the high-quality sinusoidal voltage of the positive and negative alternation of the differential output of load end.
The differential three-level inverter of non-isolated DC converter proposed by the invention, that have the foregoing circuit structure can obtain different circuits topology family through the type that changes the bidirectional three-level DC converter; Comprise Boost type, Buck type, Buck-Boost type, Cuk type, Sepic type and six kinds of circuit topologies of Zeta type; All topologys in this circuit topology family all have identical difference structure; But still some small difference; Have output inductor Lf like Buck type, Cuk type and Zeta type circuit topology, and Boost type, Buck-Boost type and Sepic type circuit topology do not have output inductor Lf; The Buck type does not have boost inductance L, and all the other all have boost inductance.
Wherein, Boost type circuit topology is as shown in Figure 2; Its physical circuit connects as follows: the positive pole of input DC power Ui and anodal connection of input filter inductance Li, and the negative pole of this Ui of input DC power is connected and ground connection with the negative pole of input filter capacitor Ci, the source electrode of second power switch tube S 12 and the negative pole of the first output filter capacitor Cf1; The negative pole of input filter inductance Li is connected with the positive pole of the first energy storage inductor L1 and the positive pole of input filter capacitor Ci respectively; The negative pole of the first energy storage inductor L1 is connected with the drain electrode of first power switch tube S 11 and the source electrode of the 3rd power switch tube S 13; The drain electrode of the 3rd power switch tube S 13 all presses the negative pole of clamping capacitance Cc1 to be connected with the source electrode and first of the 4th power switch tube S 14 respectively; The drain electrode and first of the source electrode of first power switch tube S 11 and second power switch tube S 12 all presses the positive pole of clamping capacitance Cc1 to be connected; The drain electrode of the 4th power switch tube S 14 is connected with the positive pole of the first output filter capacitor Cf1 and inserts the end of load ZL, has more than constituted one road bidirectional three-level Boost converter; The negative pole of input filter inductance Li is connected with the positive pole of the second energy storage inductor L2; The negative pole of the second energy storage inductor L2 is connected with the drain electrode of the 5th power switch tube S 21 and the source electrode of the 7th power switch tube S 23; The source electrode of the 5th power switch tube S 21 respectively with the 6th power open the light the pipe S22 drain electrode and second all press the positive pole of clamping capacitance Cc2 to be connected; The source electrode and second of the drain electrode of the 7th power switch tube S 23 and the 8th power switch tube S 24 all presses the negative pole of clamping capacitance Cc2 to be connected; The source electrode of the 6th power switch tube S 22 is connected and ground connection with the negative pole of output filter capacitor Cf2 and the negative pole of input DC power Ui respectively; The drain electrode of the 8th power switch tube S 24 is connected with the positive pole of the second output filter capacitor Cf2 and inserts the other end of load ZL, has more than constituted another road bidirectional three-level Boost DC converter.Boost type topology is applicable to step-down DC-AC conversion occasion.
Buck type circuit topology is as shown in Figure 3; Its physical circuit connects as follows: the positive pole of input high-voltage DC power supply Ui is connected and ground connection with the negative pole of input filter capacitor Ci, the source electrode of the 4th power switch tube S 14 and the negative pole of the first output filter capacitor Cf1 with anodal connection of input filter inductance Li, the negative pole of input high-voltage DC power supply Ui; The negative pole of input filter inductance Li links to each other with the drain electrode anodal and second power switch tube S 12 of input filter capacitor Ci respectively; The source electrode of second power switch tube S 12 all presses the positive pole of clamping capacitance Cc1 to be connected with the drain electrode and first of the first power switch S11; The positive pole of the source electrode of first power switch tube S 11 and the first output inductor Lf1, the drain electrode of the 3rd power switch tube S 13 are connected; The source electrode of the negative pole of the first striding capacitance Cc1 and the 3rd power switch tube S 13 and the drain electrode of the 4th power switch tube S 14 are connected; The negative pole of the first output inductor Lf1 is connected with the positive pole of the first output filter capacitor Cf1 and inserts the end of load ZL; More than constituted one road bidirectional three-level Buck DC converter.The negative pole of input filter inductance Li and the drain electrode of the 6th power switch tube S 22 are connected; The drain electrode and second of the source electrode of the 6th power switch tube S 22 and the 5th power switch tube S 21 all presses the positive pole of clamp Cc2 to be connected; The drain electrode of the source electrode of the 5th power switch tube S 21 and the 7th power switch tube S 23 and the positive pole of the second output inductor Lf2 are connected; Second all presses negative pole and the source electrode of the 7th the power switch tube S 23 and drain electrode of the 8th power switch tube S 24 of clamping capacitance Cc2 to be connected; The negative pole of the source electrode of the 8th power switch tube S 24 and the second output filter capacitor Cf2 and the negative pole of DC power supply Ui are connected and ground connection; The positive pole of the negative pole of the second output inductor Lf2 and second output filter capacitor Cf2 is connected and inserts the other end of load ZL; More than constituted another road bidirectional three-level Buck converter.Buck type topology is applicable to step-down DC-AC conversion occasion.
Buck-boost type circuit topology is as shown in Figure 4; Its physical circuit connects as follows: the positive pole of input high-voltage DC power supply Ui is connected and ground connection with the negative pole of input filter capacitor Ci, the negative pole of the first energy storage inductor L1 and the negative pole of the first output filter capacitor Cf1 with anodal connection of input filter inductance Li, the negative pole of this Ui of input high-voltage DC power supply; The negative pole of input filter inductance Li links to each other with the drain electrode anodal and second power switch tube S 12 of input filter capacitor Ci respectively; The drain electrode and first of the source electrode of second power switch tube S 12 and first power switch tube S 12 all presses the positive pole of clamping capacitance Cc1 to be connected; The source electrode of first power switch tube S 11 is connected with the drain electrode of the 3rd power switch tube S 13, the positive pole of the first energy storage inductor L1 respectively; The source electrode of the 3rd power switch tube S 13 and first all presses the negative pole of clamping capacitance Cc1 and the drain electrode of the 4th power switch tube S 14 to be connected; The source electrode of the 4th power switch tube S 14 is connected with the first output filter capacitor Cf1 and inserts the end of load ZL, has more than constituted one road bidirectional three-level Buck-boost DC converter; The negative pole of input filter inductance Li and the drain electrode of the 6th power switch tube S 22 are connected; The drain electrode and second of the source electrode of the 6th power switch tube S 22 and the 5th power switch tube S 21 all presses the positive pole of clamping capacitance Cc2 to be connected; The drain electrode of the source electrode of the 5th power switch tube S 21 and the 7th power switch tube S 23 and the positive pole of the second energy storage inductor L2 are connected; The negative pole of the second energy storage inductor L2 is connected and ground connection with the negative pole of the second output filter capacitor Cf2 and the negative pole of direct-current input power supplying Ui respectively; The source electrode of the negative pole of the second striding capacitance Cc2 and the 7th power switch tube S 23 and the drain electrode of the 8th power switch tube S 24 are connected; The positive pole of the source electrode of the 8th power switch tube S 24 and the second output filter capacitor Cf2 is connected and inserts the other end of load ZL, has more than constituted another road bidirectional three-level Buck-boost converter.Buck-boost type topology is applicable to ascending, descending pressure DC-AC conversion occasion.
Cuk type circuit topology is as shown in Figure 5; Its physical circuit connects as follows: the positive pole of input high-voltage DC power supply Ui is connected and ground connection with the negative pole of input filter capacitor Ci, the source electrode of second power switch tube S 12, the drain electrode of the 4th power switch tube S 14 and the negative pole of the first output filter capacitor Cf1 with anodal connection of input filter inductance Li, the negative pole of input high-voltage DC power supply Ui; The negative pole of input filter inductance Li is connected with the anodal and first energy storage inductor L1 positive pole of input filter capacitor Ci respectively; The negative pole of the first energy storage inductor L1 is connected with the drain electrode of first power switch tube S 11 and the positive pole of the first storage capacitor C1; The source electrode of first power switch tube S 11 and first all presses the positive pole of clamping capacitance Cc1, the drain electrode of second power switch tube S 12 to be connected; The negative pole of the first storage capacitor C1 is connected with the source electrode of the 3rd power switch tube S 13, the positive pole of the first output inductor Lf1; First all presses the negative pole of clamping capacitance Cc1 to be connected with the drain electrode of the 3rd power switch tube S 13 and the source electrode of the 4th power switch tube S 14; The negative pole of the first output inductor Lf1 is connected with the first output filter capacitor Cf1 and receives the end of load ZL; More than constituted one road bidirectional three-level Cuk DC converter; The negative pole of input filter inductance Li and the positive pole of the second energy storage inductor L2 are connected; The drain electrode of the negative pole of the second energy storage inductor L2 and the 5th power switch tube S 21 and the positive pole of the second storage capacitor C2 are connected, and the drain electrode and second of the source electrode of the 5th power switch tube S 21 and the 6th power switch tube S 22 all presses the positive pole of clamping capacitance Cc2 to be connected; The negative pole of the second storage capacitor C2 is connected with the source electrode of the 7th power switch tube S 23, the positive pole of the second output inductor Lf2; Second all presses the negative pole of clamping capacitance Cc2 to be connected with the drain electrode of the 7th power switch tube S 23 and the source electrode of the 8th power switch tube S 24; The source electrode of the 6th power switch tube S 22 is connected and ground connection with the drain electrode of the 8th power switch tube S 24, the negative pole of the second output filter capacitor Cf2, the negative pole of input DC power Ui respectively; The positive pole of the negative pole of the second output inductor Lf2 and the second output filter capacitor Cf2 is connected and receives the other end of load ZL; More than constituted another road bidirectional three-level Cuk converter.Cuk type topology is applicable to ascending, descending pressure DC-AC conversion occasion.
Sepic type circuit topology is as shown in Figure 6; Its physical circuit connects as follows: the positive pole of input high-voltage DC power supply Ui is connected and ground connection with the negative pole of input filter capacitor Ci, the source electrode of second power switch tube S 12, the negative pole of the second energy storage inductor L12 and the negative pole of the first output filter capacitor Cf1 with anodal connection of input filter inductance Li, the negative pole of input high-voltage DC power supply Ui; The negative pole of input filter inductance Li is connected with the positive pole anodal and the first energy storage inductor L11 of input filter capacitor Ci respectively; The negative pole of the first energy storage inductor L11 is connected with the drain electrode of first power switch tube S 11 and the positive pole of the first storage capacitor C1; The source electrode of first power switch tube S 11 and first all presses the positive pole of clamping capacitance Cc1, the drain electrode of second power switch tube S 12 to be connected; The negative pole of the first storage capacitor C1 is connected with the source electrode of the 3rd power switch tube S 13, the positive pole of the second energy storage inductor L12; First all presses the negative pole of clamping capacitance Cc1 to be connected with the drain electrode of the 3rd power switch tube S 13, the source electrode of the 4th power switch tube S 14; The drain electrode of the 4th power switch tube S 14 is connected with the positive pole of the first output filter capacitor Cf1 and receives the end of load ZL, has more than constituted one road bidirectional three-level Sepic DC converter; The negative pole of input filter inductance Li and the positive pole of the 3rd energy storage inductor L21 are connected; The drain electrode of the negative pole of the 3rd energy storage inductor L21 and the 5th power switch tube S 21 and the positive pole of the second storage capacitor C2 are connected, and the drain electrode of the source electrode of the 5th power switch tube S 21 and the 6th power switch tube S 22 and the positive pole of the second striding capacitance Cc2 are connected; The negative pole of the second storage capacitor C2 is connected with the source electrode of the 7th power switch tube S 23, the positive pole of the 4th energy storage inductor L22; Second all presses the negative pole of clamping capacitance Cc2 to be connected with the drain electrode of the 7th power switch tube S 23 and the source electrode of the 8th power switch tube S 24; The negative pole of the 4th energy storage inductor L22 is connected and ground connection with the source electrode of the 6th power switch tube S 22, the negative pole of input DC power Ui and the negative pole of the second output filter capacitor Cf2; The positive pole of the drain electrode of the 8th power switch tube S 24 and the second output filter capacitor Cf2 is connected and receives the other end of load ZL, has more than constituted another road bidirectional three-level Sepic converter.Sepic type topology is applicable to ascending, descending pressure DC-AC conversion occasion.
Zeta type circuit topology is as shown in Figure 7; Its physical circuit connects as follows: the positive pole of input high-voltage DC power supply Ui is connected and ground connection with the negative pole of input filter capacitor Ci, the negative pole of the first energy storage inductor L1, the source electrode of the 4th power switch tube S 14 and the negative pole of the first output filter capacitor Cf1 with anodal connection of input filter inductance Li, the negative pole of input high-voltage DC power supply Ui; The negative pole of input filter inductance Li is connected with the drain electrode anodal and second power switch tube S 12 of input filter capacitor Ci respectively; The source electrode of second power switch tube S 12 all presses the positive pole of clamping capacitance Cc1 to be connected with the drain electrode and first of first power switch tube S 11; The source electrode of first power switch tube S 11 is connected with the positive pole of the first storage capacitor C1; The negative pole of the first storage capacitor C1 is connected with the positive pole of the first energy storage inductor L1, the drain electrode of the 3rd power switch tube S 13, the positive pole of the first output inductor Lf1; First all presses the negative pole of clamping capacitance Cc1 to be connected with the source electrode of the 3rd power switch tube S 13, the drain electrode of the 4th power switch tube S 14; The negative pole of first output inductor Lf1 is connected with the positive pole of first output filter capacitor Cf1 and receives the end of load ZL; More than constituted one road bidirectional three-level Zeta DC converter; The negative pole of input filter inductance Li and the drain electrode of the 6th power switch tube S 22 are connected; The source electrode of the 6th power switch tube S 22 all presses the positive pole of clamping capacitance Cc2 to be connected with the drain electrode, second of the 5th power switch tube S 21; The source electrode of the 5th power switch tube S 21 is connected with the positive pole of the second storage capacitor C2; The negative pole of the second storage capacitor C2 is connected with the positive pole of the second energy storage inductor L2, the drain electrode of the 7th power switch tube S 23 and the positive pole of second output inductor Lf2; Second all presses the negative pole of clamping capacitance Cc2 and the source electrode, the 8th of the 7th power switch tube S 23
The drain electrode of power switch tube S 24 is connected; The source electrode of the 8th power switch tube S 24 links to each other with the negative pole of the second energy storage inductor L2, the second output filter capacitor Cf2 and input DC power Ui and ground connection; The second output inductor Lf2 negative pole is connected with the positive pole of the second storage capacitor Cf2 and receives the other end of load ZL; More than constituted another road bidirectional three-level Zeta converter.Zeta type topology is applicable to ascending, descending pressure DC-AC conversion occasion.

Claims (7)

1. the differential three-level inverter of non-isolated DC converter type is characterized in that: by the high-voltage DC power supply [U that connects successively i], input filter inductance [L i], input filter capacitor [C i], two identical bidirectional three-level DC converters and AC load form; Wherein, two non-isolation type bidirectional three-level DC converter input parallel connections, output series connection; Input high-voltage DC power supply [U i] positive pole and input filter inductance [L i] an end connect input filter inductance [L i] the other end respectively with two bidirectional three-level DC converters, input filter capacitor [C i] be connected this input filter capacitor [C i] the other end respectively with input high-voltage DC power supply [U i] negative pole, two bidirectional three-level DC converters be connected described input filter inductance [L i] and input filter capacitor [C i] constituting input filter, this input filter is to input high-voltage DC power supply [U i] carry out filtering; Described two bidirectional three-level DC converters will be converted into three level output voltages through the filtered input voltage of input filter, and the first bidirectional three-level DC converter [1] is by the first energy storage inductor [L 1], the first power switch pipe [S 11], the second power switch pipe [S 12], the 3rd power switch pipe [S 13], the 4th power switch pipe [S 14], first all press clamping capacitance [C C1] and the first output filter capacitor [C F1]; The second bidirectional three-level DC converter [2] is by energy storage inductor [L 2], the 5th power switch pipe [S 21], the 6th power switch pipe [S 22], the 7th power switch pipe [S 23], the 8th power switch pipe [S 24], second all press clamping capacitance [C C2] and the second output filter capacitor [C F2] form; In bidirectional three-level DC converter [1], the first energy storage inductor [L 1] an end be connected with input filter, the other end respectively with the first power switch pipe [S 11] and the 3rd switching tube [S 13] be connected; First power switch pipe [the S 11] the other end respectively with the second power switch pipe [S 12] and first all press clamping capacitance [C C1] be connected; Second power switch pipe [the S 12] the other end and the 4th power switch pipe [S 14] be connected the 4th power switch pipe [S 14] the other end respectively with the first output filter capacitor [C F1], the first output filter capacitor [C F1] an end and output AC load [Z L] an end connect; In bidirectional three-level DC converter [2], the second energy storage inductor [L 2] an end link to each other with input filter, the other end respectively with the 5th power switch pipe [S 21] and the 7th power switch pipe [S 23] be connected; The 5th power switch pipe [S 21] the other end respectively with the 6th power switch pipe [S 22] and second all press clamping capacitance [C C2] be connected; The 6th power switch pipe [S 22] the other end be connected with input filter; Second all presses clamping capacitance [C C2] respectively with the 7th power switch pipe [S 23] the other end and the 8th power switch pipe [S 24] be connected the 8th power switch pipe [S 24] the other end respectively with the second output filter capacitor [C F2] be connected; Second output filter capacitor [the C F2] an end and output AC load [Z L] the other end connect; Two DC converter outputs have identical direct current biasing, and frequency is identical, the sinusoidal voltage that the phase phasic difference is 180 °, and the difference of the two is output voltage u 0
2. the differential three-level inverter of a kind of non-isolated DC converter type according to claim 1 is characterized in that: the high-voltage DC power supply [U that connects successively i], input filter, two identical non-isolation type bidirectional three-level Boost converters and AC load [Z L] be combined into the Boost circuit topology that is applicable to the DC-AC conversion occasion of boosting, i.e. input DC power [U i] positive pole and input filter inductance [L i] anodal connection, input DC power [U i] negative pole and input filter capacitor [C i] negative pole, the second power switch pipe [S 12] the source electrode and the first output filter capacitor [C F1] negative pole be connected and ground connection; Input filter inductance [L i] negative pole respectively with the first energy storage inductor [L 1] positive pole and input filter capacitor [C i] positive pole be connected; Described input filter inductance [L i] and input filter capacitor [C i] the formation input filter; First energy storage inductor [the L 1] the negative pole and the first power switch pipe [S 11] drain electrode and the 3rd power switch pipe [S 13] source electrode be connected; The 3rd power switch pipe [S 13] drain electrode respectively with the 4th power switch pipe [S 14] source electrode and first all press clamping capacitance [C C1] negative pole be connected; First power switch pipe [the S 11] the source electrode and the second power switch pipe [S 12] drain electrode and first all press clamping capacitance [C C1] positive pole be connected; The 4th power switch pipe [S 14] the drain electrode and the first output filter capacitor [C F1] positive pole be connected and insert load [Z L] an end, more than constituted one road bidirectional three-level Boost converter; Input filter inductance [L i] the negative pole and the second energy storage inductor [L 2] positive pole be connected; Second energy storage inductor [the L 2] negative pole and the 5th power switch pipe [S 21] drain electrode and the 7th power switch pipe [S 23] source electrode be connected; The 5th power switch pipe [S 21] source electrode respectively with the 6th power pipe [S that opens the light 22] drain electrode and second all press clamping capacitance [C C2] positive pole be connected; The 7th power switch pipe [S 23] drain electrode and the 8th power switch pipe [S 24] source electrode and second all press clamping capacitance [C C2] negative pole be connected; The 6th power switch pipe [S 22] source electrode respectively and output filter capacitor [C F2] negative pole and input DC power [U i] negative pole be connected and ground connection; The 8th power switch pipe [S 24] the drain electrode and the second output filter capacitor [C F2] positive pole be connected and insert load [Z L] the other end, more than constituted another road bidirectional three-level Boost DC converter; Output filter capacitor C F1, C F2High order harmonic component in the filtering three-level DC converter output voltage obtains having identical direct current biasing in the both sides of AC load, the low-frequency sinusoidal ac voltages u that the phase phasic difference is 180 ° O1, u O2Thereby, obtain output voltage u o
3. the differential three-level inverter of non-isolated DC converter type according to claim 1 is characterized in that: the high-voltage DC power supply [U that connects successively i], input filter, two identical non-isolation type bidirectional three level Buck-boost converters and AC load [Z L] be combined into the Buck-boost circuit topology that is applicable to buck DC-AC conversion occasion, promptly import high-voltage DC power supply [U i] positive pole and input filter inductance [L i] the anodal connection, the input high-voltage DC power supply should [U i] negative pole and input filter capacitor [C i] negative pole, the first energy storage inductor [L 1] the negative pole and the first output filter capacitor [C F1] negative pole be connected and ground connection; Input filter inductance [L i] negative pole respectively with input filter capacitor [C i] the anodal and second power switch pipe [S 12] drain electrode link to each other; Described input filter inductance [L i] and input filter capacitor [C i] the formation input filter; Second power switch pipe [the S 12] the source electrode and the first power switch pipe [S 12] drain electrode and first all press clamping capacitance [C C1] positive pole be connected; First power switch pipe [the S 11] source electrode respectively with the 3rd power switch pipe [S 13] drain electrode, the first energy storage inductor [L 1] positive pole be connected; The 3rd power switch pipe [S 13] source electrode and first all press clamping capacitance [C C1] negative pole and the 4th power switch pipe [S 14] drain electrode be connected; The 4th power switch pipe [S 14] the source electrode and the first output filter capacitor [C F1] be connected and insert load [Z L] an end, more than constituted one road bidirectional three-level Buck-boost DC converter; Input filter inductance [L i] negative pole and the 6th power switch pipe [S 22] drain electrode be connected; The 6th power switch pipe [S 22] source electrode and the 5th power switch pipe [S 21] drain electrode and second all press clamping capacitance C C2Positive pole be connected; The 5th power switch pipe [S 21] source electrode and the 7th power switch pipe [S 23] the drain electrode and the second energy storage inductor [L 2] positive pole be connected; Second energy storage inductor [the L 2] negative pole respectively with the second output filter capacitor [C F2] negative pole and direct-current input power supplying [U i] negative pole be connected and ground connection; Second striding capacitance [the C C2] negative pole and the 7th power switch pipe [S 23] source electrode and the 8th power switch pipe [S 24] drain electrode be connected; The 8th power switch pipe [S 24] the source electrode and the second output filter capacitor [C F2] positive pole be connected and insert load [Z L] the other end, more than constituted another road bidirectional three-level Buck-boost converter; Output filter capacitor C F1, C F2High order harmonic component in the filtering three-level DC converter output voltage obtains having identical direct current biasing in the both sides of AC load, the low-frequency sinusoidal ac voltages u that the phase phasic difference is 180 ° O1, u O2Thereby, obtain output voltage u o
4. the differential three-level inverter of non-isolated DC converter type according to claim 1 is characterized in that: the high-voltage DC power supply [U that connects successively i], input filter, two identical non-isolation type bidirectional three level Cuk converters and AC load group [Z L] the synthetic Cuk circuit topology that is applicable to buck DC-AC conversion occasion, promptly import high-voltage DC power supply [U i] positive pole and input filter inductance [L i] the anodal connection, input high-voltage DC power supply [U i] negative pole and input filter capacitor [C i] negative pole, the second power switch pipe [S 12] source electrode, the 4th power switch pipe [S 14] the drain electrode and the first output filter capacitor [C F1] negative pole be connected and ground connection; Input filter inductance [L i] negative pole respectively with input filter capacitor [C i] the anodal and first energy storage inductor [L 1] positive pole is connected; Described input filter inductance [L i] and input filter capacitor C iConstitute input filter; First energy storage inductor [the L 1] the negative pole and the first power switch pipe [S 11] the drain electrode and the first storage capacitor [C 1] positive pole be connected; First power switch pipe [the S 11] source electrode and first all press clamping capacitance C C1Positive pole, the second power switch pipe [S 12] drain electrode be connected; First storage capacitor [the C 1] negative pole and the 3rd power switch pipe [S 13] source electrode, the first output inductor [L F1] positive pole be connected; First all presses clamping capacitance [C C1] negative pole and the 3rd power switch pipe [S 13] drain electrode and the 4th power switch pipe [S 14] source electrode be connected; First output inductor [the L F1] the negative pole and the first output filter capacitor [C F1] be connected and receive load Z LAn end; The above-mentioned first output inductor [L F1] and the first output filter capacitor [C F1] constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O1More than constituted one road bidirectional three-level Cuk DC converter; Input filter inductance [L i] the negative pole and the second energy storage inductor [L 2] positive pole be connected; Second energy storage inductor [the L 2] negative pole and the 5th power switch pipe [S 21] the drain electrode and the second storage capacitor [C 2] positive pole be connected the 5th power switch pipe [S 21] source electrode and the 6th power switch pipe [S 22] drain electrode and second all press clamping capacitance [C C2] positive pole be connected; Second storage capacitor [the C 2] negative pole and the 7th power switch pipe [S 23] source electrode, the second output inductor [L F2] positive pole be connected; Second all presses clamping capacitance [C C2] negative pole and the 7th power switch pipe [S 23] drain electrode and the 8th power switch pipe [S 24] source electrode be connected; The 6th power switch pipe [S 22] source electrode respectively with the 8th power switch pipe [S 24] drain electrode, the second output filter capacitor [C F2] negative pole, input DC power [U i] negative pole be connected and ground connection; Second output inductor [the L F2] the negative pole and the second output filter capacitor [C F2] positive pole be connected and receive load [Z L] the other end; The above-mentioned second output inductor [L F2] and the second output filter capacitor [C F2] constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained having the sinusoidal voltage u of direct current biasing O2More than constituted another road bidirectional three-level Cuk converter.
5. the differential three-level inverter of non-isolated DC converter type according to claim 1 is characterized in that: the high-voltage DC power supply [U that connects successively i], input filter, two identical non-isolation type bidirectional three level Sepic converters and AC load [Z L] be combined into the Sepic circuit topology that is applicable to buck DC-AC conversion occasion, promptly import high-voltage DC power supply [U i] positive pole and input filter inductance [L i] the anodal connection, input high-voltage DC power supply [U i] negative pole and input filter capacitor [C i] negative pole, the second power switch pipe [S 12] source electrode, the second energy storage inductor [L 12] the negative pole and the first output filter capacitor [C F1] negative pole be connected and ground connection; Input filter inductance [L i] negative pole respectively with input filter capacitor [C i] the anodal and first energy storage inductor [L 11] positive pole be connected; Described input filter inductance [L i] and input filter capacitor C iConstitute input filter; First energy storage inductor [the L 11] the negative pole and the first power switch pipe [S 11] the drain electrode and the first storage capacitor C 1Positive pole be connected; First power switch pipe [the S 11] source electrode and first all press clamping capacitance [C C1] positive pole, the second power switch pipe [S 12] drain electrode be connected; First storage capacitor [the C 1] negative pole and the 3rd power switch pipe [S 13] source electrode, the second energy storage inductor [L 12] positive pole be connected; First all presses clamping capacitance [C C1] negative pole and the 3rd power switch pipe [S 13] drain electrode, the 4th power switch pipe [S 14] source electrode be connected; The 4th power switch pipe [S 14] the drain electrode and the first output filter capacitor [C F1] positive pole be connected and receive load [Z L] an end, more than constituted one road bidirectional three-level Sepic DC converter; Input filter inductance [L i] negative pole and the 3rd energy storage inductor [L 21] positive pole be connected; The 3rd energy storage inductor L 21Negative pole and the 5th power switch pipe [S 21] the drain electrode and the second storage capacitor [C 2] positive pole be connected the 5th power switch pipe [S 21] source electrode and the 6th power switch pipe [S 22] the drain electrode and the second striding capacitance [C C2] positive pole be connected; Second storage capacitor [the C 2] negative pole and the 7th power switch pipe [S 23] source electrode, the 4th energy storage inductor L 22Positive pole be connected; Second all presses clamping capacitance [C C2] negative pole and the 7th power switch pipe [S 23] drain electrode and the 8th power switch pipe [S 24] source electrode be connected; The 4th energy storage inductor [L 22] negative pole and the 6th power switch pipe [S 22] source electrode, input DC power [U i] the negative pole and the second output filter capacitor [C F2] negative pole be connected and ground connection; The 8th power switch pipe [S 24] the drain electrode and the second output filter capacitor [C F2] positive pole be connected and receive load [Z L] the other end more than constituted another road bidirectional three-level Sepic converter; Output filter capacitor C F1, C F2High order harmonic component in the filtering three-level DC converter output voltage obtains having identical direct current biasing in the both sides of AC load, the low-frequency sinusoidal ac voltages u that the phase phasic difference is 180 ° O1, u O2Thereby, obtain output voltage u o
6. the differential three-level inverter of non-isolated DC converter type according to claim 1 is characterized in that: the high-voltage DC power supply [U that connects successively i], input filter, two identical non-isolation type bidirectional three level Zeta converters and AC load [Z L] be combined into the Zeta circuit topology that is applicable to the DC-AC conversion occasion of boosting, promptly import high-voltage DC power supply [U i] positive pole and input filter inductance [L i] the anodal connection, input high-voltage DC power supply [U i] negative pole and input filter capacitor [C i] negative pole, the first energy storage inductor [L 1] negative pole, the 4th power switch pipe [S 14] the source electrode and the first output filter capacitor [C F1] negative pole be connected and ground connection; Input filter inductance [L i] negative pole respectively with input filter capacitor [C i] the anodal and second power switch pipe [S 12] drain electrode be connected; Described input filter inductance [L i] and input filter capacitor [C i] the formation input filter; Second power switch pipe [the S 12] the source electrode and the first power switch pipe [S 11] drain electrode and first all press clamping capacitance [C C1] positive pole be connected; First power switch pipe [the S 11] the source electrode and the first storage capacitor [C 1] positive pole be connected; First storage capacitor [the C 1] the negative pole and the first energy storage inductor [L 1] positive pole, the 3rd power switch pipe [S 13] drain electrode, the first output inductor [L F1] positive pole be connected; First all presses clamping capacitance [C C1] negative pole and the 3rd power switch pipe [S 13] source electrode, the 4th power switch pipe [S 14] drain electrode be connected; First output inductor [L F1] negative pole and first output filter capacitor [C F1] positive pole be connected and receive load [Z L] an end; The above-mentioned first output inductor [L F1] and the first output filter capacitor [C F1] constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O1More than constituted one road bidirectional three-level Zeta DC converter; Input filter inductance [L i] negative pole and the 6th power switch pipe [S 22] drain electrode be connected; The 6th power switch pipe [S 22] source electrode and the 5th power switch pipe [S 21] drain electrode, second all press clamping capacitance [C C2] positive pole be connected; The 5th power switch pipe [S 21] the source electrode and the second storage capacitor [C 2] positive pole be connected; Second storage capacitor [the C 2] the negative pole and the second energy storage inductor [L 2] positive pole, the 7th power switch pipe [S 23] drain electrode and second output inductor [L F2] positive pole be connected; Second all presses clamping capacitance [C C2] negative pole and the 7th power switch pipe [S 23] source electrode, the 8th power switch pipe [S 24] drain electrode be connected; The 8th power switch pipe [S 24] the source electrode and the second energy storage inductor [L 2], the second output filter capacitor [C F2] and input DC power [U i] negative pole link to each other and ground connection; Second output inductor [the L F2] negative pole and the second storage capacitor [C F2] positive pole be connected and receive load [Z L] the other end; The above-mentioned second output inductor [L F2] and the second output filter capacitor [C F2] constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained having the sinusoidal voltage u of direct current biasing O2More than constituted another road bidirectional three-level Zeta converter.
7. the differential three-level inverter of non-isolated DC converter type is characterized in that: the high-voltage DC power supply [U that connects successively i], input filter, two identical non-isolation type bidirectional three level Buck converters and AC load [Z L] be combined into the Buck circuit topology that is applicable to step-down DC-AC conversion occasion, promptly import high-voltage DC power supply [U i] positive pole and input filter inductance [L i] the anodal connection, input high-voltage DC power supply [U i] negative pole and input filter capacitor [C i] negative pole, the 4th power switch pipe [S 14] the source electrode and the first output filter capacitor [C F1] negative pole be connected and ground connection; Input filter inductance [L i] negative pole respectively with input filter capacitor [C i] the anodal and second power switch pipe [S 12] drain electrode link to each other; Described input filter inductance [L i] and input filter capacitor [C i] the formation input filter; Second power switch pipe [the S 12] the source electrode and the first power switch [S 11] drain electrode and first all press clamping capacitance [C C1] positive pole be connected; First power switch pipe [the S 11] the source electrode and the first output inductor [L F1] positive pole, the 3rd power switch pipe [S 13] drain electrode be connected; First striding capacitance [the C C1] negative pole and the 3rd power switch pipe [S 13] source electrode and the 4th power switch pipe [S 14] drain electrode be connected; First output inductor [the L F1] the negative pole and the first output filter capacitor [C F1] positive pole be connected and insert load [Z L] an end; The above-mentioned first output inductor [L F1] and the first output filter capacitor [C F1] constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained the high-quality sinusoidal voltage u that has direct current biasing O1More than constituted one road bidirectional three-level Buck DC converter; Input filter inductance [L i] negative pole and the 6th power switch pipe [S 22] drain electrode be connected; The 6th power switch pipe [S 22] source electrode and the 5th power switch pipe [S 21] drain electrode and second all press clamp [C C2] positive pole be connected; The 5th power switch pipe [S 21] source electrode and the 7th power switch pipe [S 23] the drain electrode and the second output inductor [L F2] positive pole be connected; Second all presses clamping capacitance [C C2] negative pole and the 7th power switch pipe [S 23] source electrode and the 8th power switch pipe [S 24] drain electrode be connected; The 8th power switch pipe [S 24] the source electrode and the second output filter capacitor [C F2] negative pole and DC power supply [U i] negative pole be connected and ground connection; Second output inductor [the L F2] negative pole and second output filter capacitor [C F2] positive pole be connected and insert load [Z L] the other end; The above-mentioned second output inductor [L F2] and the second output filter capacitor [C F2] constituted output filter circuit, filtering the high order harmonic component in the three level output voltages, obtained having the sinusoidal voltage u of direct current biasing O2More than constituted another road bidirectional three-level Buck converter.
CN2012100546030A 2012-03-05 2012-03-05 Non-isolated direct-current converter type differential three-level inverter Pending CN102594189A (en)

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