CN110350816B - Single-stage single-phase current type inverter with energy storage inductor connected with active buffer circuit in parallel - Google Patents
Single-stage single-phase current type inverter with energy storage inductor connected with active buffer circuit in parallel Download PDFInfo
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- H02J3/385—
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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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
- H02M7/53871—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 with automatic control of output voltage or current
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to the technical field of power electronics, in particular to a single-stage single-phase current type inverter with an energy storage inductor connected with an active buffer circuit in parallel. The inverter can convert unstable, low-amplitude and poor direct current into stable, high-amplitude and high-quality single-phase output sinusoidal alternating current, and is suitable for boosting, medium and small-capacity single-phase passive and grid-connected inversion occasions.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a single-stage single-phase current type inverter with an energy storage inductor connected with an active buffer circuit in parallel.
Background
The inverter is a static converter device which converts direct current into alternating current by using a power semiconductor device and is used for alternating current loads or is connected with a public power grid for power generation.
Due to the increasing shortage of fossil energy (non-renewable energy) such as petroleum, coal and natural gas, serious environmental pollution, global warming, nuclear waste generated by nuclear energy production, environmental pollution and the like, energy and environment become important problems for human beings in the 21 st century. Renewable energy sources (green energy sources) such as solar energy, wind energy, tidal energy, geothermal energy and the like have the advantages of cleanness, no pollution, low price, reliability, abundance and the like, and the development and the utilization of the renewable energy sources are more and more emphasized by people, which has important significance for the continuous development of the economy of all countries in the world. The direct current electric energy converted from renewable energy sources such as solar energy, wind energy, hydrogen energy, tidal energy, geothermal energy and the like is usually unstable, and needs to be converted into alternating current electric energy by an inverter to be supplied to a load or be connected with a public power grid for generating power. The inverter has wide application prospect in the inversion occasions taking a direct current generator, a storage battery, a solar cell, a fuel cell, a wind turbine and the like as main direct current power supplies.
At present, in medium and small-capacity inversion occasions, a single-stage single-phase voltage type (voltage reduction type) inverter circuit structure is generally adopted. When the inverter works normally, the requirement that the voltage of the direct current side is larger than the peak value of the voltage of the alternating current side phase is met, so that the inverter has a remarkable defect that: when the voltage (such as the output capacity of the photovoltaic cell) on the direct current side is reduced, such as in rainy days or at night, the whole power generation system stops running, and the utilization rate of the system is reduced. To this end, two methods are often used to solve this problem: (1) a Boost type direct current converter is added at the front stage, so that a circuit structure for two-stage power conversion is formed, and the complexity, the loss and the cost of the circuit are increased; (2) the output is added with a single-phase power frequency transformer, thereby greatly increasing the volume, the weight and the cost of the system, and being particularly difficult to adapt to the current that the price of copper and iron raw materials sharply rises.
Therefore, it is urgent to find a boost type single-phase inverter having a single-stage circuit structure.
Disclosure of Invention
The invention aims to provide a single-stage single-phase current type inverter with an energy storage inductor connected with an active buffer circuit in parallel, which can convert unstable, low-amplitude and poor-quality direct current into stable, high-amplitude and good-quality single-phase output sinusoidal alternating current.
In order to achieve the purpose, the invention adopts the technical scheme that: the single-stage single-phase current type inverter with the energy storage inductor connected with the active buffer circuit in parallel comprises the energy storage inductor, a single-phase inverter bridge and an output filter which are sequentially cascaded, wherein the active buffer circuit is connected with two ends of the energy storage inductor in parallel, the active buffer circuit comprises a buffer capacitor, two diodes and two fully-controlled power switches, and the single-phase inverter bridge mainly comprises four fully-controlled power switches.
Further, the two fully-controlled power switches of the active snubber circuit are two-quadrant power switches capable of bearing bidirectional voltage stress and single-phase current stress.
Furthermore, the two fully-controlled power switches of the active snubber circuit are two-quadrant power switches capable of bearing unidirectional voltage stress and bidirectional current stress.
Further, the active snubber circuit includes a fifth power switchS 5And a sixth power switchS 6The fifth diodeD 5The sixth diodeD 6And a buffer capacitorC b Said fifth power switchS 5Drain electrode of, fifth diodeD 5Cathode and buffer capacitorC b Is connected to a sixth power switchS 6Source electrode of, sixth diodeD 6The anodes of the two capacitors are all connected with a buffer capacitorC b Is connected to the other end of the fifth power switchS 5Source and sixth diodeD 6Is connected to the cathode of the sixth power switchS 6Drain electrode of and fifth diodeD 5Are connected with each other.
Further, the energy storage inductorLAnd said fifth power switchS 5Source electrode of, sixth diodeD 6Is connected with the cathode of the energy storage inductorLAnd the other end of the sixth power switchS 6Drain electrode of, fifth diodeD 5Are connected with each other.
The invention changes the traditional single-stage single-phase voltage type (voltage reduction type) inverter circuit structure formed by sequentially cascading a single-phase inverter bridge and a single-phase LC filter into a single-stage single-phase current type (voltage increase type) circuit structure formed by sequentially cascading an energy storage inductor with two ends connected with an active buffer circuit in parallel, a single-phase inverter bridge and an output filter, and firstly provides a new concept and circuit structure of the single-stage single-phase current type (voltage increase type) inverter with the energy storage inductor connected with the active buffer circuit in parallel, namely an input voltage sourceU i Energy storage inductorLFirst power switch connected with inverter bridgeS 1And a third power switchS 3(or second power switchS 2And a fourth power switchS 4) Forming a magnetizing loop; from an input voltage sourceU i Energy storage inductorL、First power switch of inverter bridgeS 1And a fourth power switchS 4(or second power switchS 2And a third power switchS 3) The output filter and the load form an energy feedback loop; by energy-storage inductanceLThe fifth diodeD 5The sixth diodeD 6And a buffer capacitorC b Forming a buffer capacitor charging loop; by energy-storage inductanceLThe fifth power switchS 5And a sixth power switchS 6And a buffer capacitorC b Forming a buffer capacitor discharge circuit. Voltage conversion of the inverter in a boosting stage is realized through a magnetizing loop and an energy feedback loop; voltage conversion of the voltage reduction stage of the inverter is realized through the charging loop and the energy feedback loop; and the voltage conversion of the inverter and the release of the redundant energy of the buffer capacitor are realized through a discharge loop and an energy feedback loop.
Compared with the prior art, the invention has the following beneficial effects: the single-phase sinusoidal AC power generation system can convert unstable, low-amplitude and poor-quality direct current into stable, high-amplitude and high-quality single-phase output sinusoidal alternating current, has the advantages of single-stage boosting power conversion, high power density, high conversion efficiency, low output waveform distortion degree, high reliability in overload and short circuit, long service life, low cost and the like, is suitable for boosting, medium and small-capacity single-phase passive and grid-connected inversion occasions, and is particularly suitable for whole-process light energy and wind energy utilization and maximum power point tracking control of photovoltaic and wind power generation systems. Along with the appearance of novel devices such as bidirectional blocking IGBT, the series diode is not needed any more in the inverter, the loss problem of the series diode is solved, the unique advantages of the inverter are better displayed, and the inverter has strong practicability and wide application prospect.
Drawings
Fig. 1 is a circuit configuration of an embodiment of the present invention.
Fig. 2 is an equivalent circuit of a single-stage single-phase current source inverter in the charging mode of an energy storage inductor according to an embodiment of the present invention.
Fig. 3 is an equivalent circuit of a single-stage single-phase current-mode inverter in a buffer capacitor discharge mode according to an embodiment of the present invention.
Fig. 4 is an equivalent circuit of a single-stage single-phase current-mode inverter in a buffer capacitor charging mode according to an embodiment of the present invention.
Fig. 5 is an equivalent circuit of a single-stage single-phase current-mode inverter in the positive half-cycle energy feeding mode of an inverter bridge according to an embodiment of the invention.
Fig. 6 is an equivalent circuit of the single-stage single-phase current-mode inverter in the negative half-cycle energy feeding mode of the inverter bridge according to the embodiment of the invention.
Fig. 7 is a circuit topology of a first order C-filter of a single-stage single-phase current-mode inverter according to an embodiment of the invention.
Fig. 8 is a circuit topology of a single-stage single-phase current-mode inverter second-order CL filter according to an embodiment of the present invention.
Fig. 9 shows an output voltage feedback control strategy during off-grid inversion of the single-stage single-phase current source inverter according to the embodiment of the invention.
Fig. 10 is a schematic waveform of a single-stage single-phase current source inverter according to an embodiment of the present invention during off-grid inversion.
Fig. 11 is a switching equivalent circuit of the energy storage inductor in the magnetizing mode during the first-order C filtering of the single-stage single-phase current source inverter according to the embodiment of the present invention.
Fig. 12 is a switch equivalent circuit of the buffer capacitor discharge mode in the first-order C filtering of the single-stage single-phase current source inverter according to the embodiment of the present invention.
Fig. 13 is a switching equivalent circuit of the buffer capacitor charging mode during the first-order C filtering of the single-stage single-phase current source inverter according to the embodiment of the present invention.
Fig. 14 is a switching equivalent circuit of the positive half cycle energy feedback mode of the inverter bridge during the first-order C filtering of the single-stage single-phase current source inverter according to the embodiment of the invention.
Fig. 15 is a switching equivalent circuit of the negative half cycle energy feedback mode of the inverter bridge during the first-order C filtering of the single-stage single-phase current source inverter according to the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, the invention provides a single-stage single-phase current type inverter with an energy storage inductor connected in parallel with an active snubber circuit, which comprises an energy storage inductor, a single-phase inverter bridge and an output filter that are sequentially cascaded, wherein the active snubber circuit is connected in parallel at two ends of the energy storage inductor, the active snubber circuit comprises a snubber capacitor, two diodes and two fully-controlled power switches, and the single-phase inverter bridge mainly comprises four fully-controlled power switches.
The two fully-controlled power switches of the active snubber circuit may be two-quadrant power switches capable of bearing bidirectional voltage stress and single-phase current stress, or two-quadrant power switches capable of bearing unidirectional voltage stress and bidirectional current stress.
In this embodiment, the active snubber circuit includes a fifth power switchS 5And a sixth power switchS 6The fifth diodeD 5The sixth diodeD 6And a buffer capacitorC b Said fifth power switchS 5Drain electrode of, fifth diodeD 5Cathode and buffer capacitorC b Is connected to a sixth power switchS 6Source electrode of, sixth diodeD 6The anodes of the two capacitors are all connected with a buffer capacitorC b Is connected to the other end of the fifth power switchS 5Source and sixth diodeD 6Is connected to the cathode of the sixth power switchS 6Drain electrode of and fifth diodeD 5Are connected with each other. The energy storage inductorLAnd said fifth power switchS 5Source electrode of, sixth diodeD 6Is connected with the cathode of the energy storage inductorLAnd the other end of the sixth power switchS 6Drain electrode of, fifth diodeD 5Are connected with each other.
The invention is firstly carriedThe new concept and circuit structure of single-stage single-phase current type (boosting type) inverter with energy-storage inductor connected in parallel with active buffer circuit are provided, i.e. input voltage sourceU i Energy storage inductorLFirst power switch connected with inverter bridgeS 1And a third power switchS 3(or second power switchS 2And a fourth power switchS 4) Forming a magnetizing loop; from an input voltage sourceU i Energy storage inductorL、First power switch of inverter bridgeS 1And a fourth power switchS 4(or second power switchS 2And a third power switchS 3) The output filter and the load form an energy feedback loop; by energy-storage inductanceLThe fifth diodeD 5The sixth diodeD 6And a buffer capacitorC b Forming a buffer capacitor charging loop; by energy-storage inductanceLThe fifth power switchS 5And a sixth power switchS 6And a buffer capacitorC b Forming a buffer capacitor discharge circuit. Voltage conversion of the inverter in a boosting stage is realized through a magnetizing loop and an energy feedback loop; voltage conversion of the voltage reduction stage of the inverter is realized through the charging loop and the energy feedback loop; and the voltage conversion of the inverter and the release of the redundant energy of the buffer capacitor are realized through a discharge loop and an energy feedback loop.
In the context of figure 1 of the drawings,U i for inputting DC voltage source, energy-storing inductorLActive buffer circuit (composed of) for inverting and boosting conversion and energy storage inductor parallel connectionD 5、D 6、S 5、S 6AndC b constructed) for buffering an input DC voltage sourceU i Energy storage inductorLThe power fluctuation of the system is realized, so that the aim of balancing the input energy and the output energy of the system in the whole low-frequency output period is fulfilled; the single-phase filter is used for filtering high-frequency ripple components of voltage and current at the output side of the inverter so as to ensure the quality of an output waveform of the inverter;Z L the load impedance for the off-grid operation of the inverter,u n for inverter grid-connected operationThe single-phase ac mains voltage of (1).
In this embodiment, the single-stage single-phase current type inverter with the energy storage inductor connected in parallel with the active snubber circuit of the present invention has five circuit modes and three operation modes, which are specifically as follows:
the inverter has five circuit modes including an energy storage inductor magnetizing mode, a buffer capacitor discharging mode, a buffer capacitor charging mode, an inverter bridge positive half cycle energy feedback mode and an inverter bridge negative half cycle energy feedback mode, and equivalent circuits of the inverter are respectively shown in fig. 2, 3, 4, 5 and 6.
The inverter has three working modes in a low-frequency output period, namely an energy storage inductive current instantaneous valuei L Less than the current limit value of the energy storage inductorI L *And buffer the capacitor voltage transientu Cb Is less than the voltage limit value of the buffer capacitorU Cb *When the voltage is higher than the set voltage, the inverter is in a magnetizing and boosting mode; instantaneous value of energy storage inductance currenti L Less than the current limit value of the energy storage inductorI L *And buffer the capacitor voltage transientu Cb Greater than the voltage limit of the buffer capacitorU Cb *When the voltage is in the discharging and boosting mode, the inverter is in the discharging and boosting mode; instantaneous value of energy storage inductance currenti L Greater than the current limit value of the energy storage inductorI L *When the inverter is in the charge buck mode.
Wherein, the inverter magnetizing and boosting mode is as follows: in thati L <I L *And isu Cb <U Cb *During each high frequency switching cycle of the inverter, during DTs, byU i 、LAndS 1andS 3(orS 2AndS 4) Formed loop pairLThe energy storage inductor is magnetized; and (1-D) during Ts, fromU i 、LAnd, andS 1andS 4(orS 2AndS 3) The formed loop carries out positive (or negative) half-cycle energy feedback mode of the inverter bridge for feeding energy to the load.
Wherein the inverter discharge boost mode is: in thati L <I L *And isu Cb >U Cb *During each high frequency switching cycle of the inverter, during DTs, byL、C b AndS 5andS 6formed loop pairCIs discharged and is aligned withLPerforming a buffer capacitor discharge mode of magnetizing; and (1-D) during Ts, fromU i 、LAnd, andS 1andS 4(orS 2AndS 3) The formed loop carries out positive (or negative) half-cycle energy feedback mode of the inverter bridge for feeding energy to the load.
Wherein the inverter charge buck mode is: in thati L >I L *During each high frequency switching cycle of the inverter, during DTs, byL、C b AndD 5andD 6formed loop pairCIs charged and is rightLA buffer capacitor charging mode for demagnetization; and (1-D) during Ts, fromU i 、LAnd, andS 1andS 4(orS 2AndS 3) The formed loop carries out positive (or negative) half-cycle energy feedback mode of the inverter bridge for feeding energy to the load.
The three working modes are all that the energy storage inductive current is inverted into the three-state modulation current through the single-phase inversion bridgei m After single-phase filtering, high-quality single-phase sinusoidal alternating voltage is obtained on single-phase alternating current loadu n Or obtaining high quality single-phase sinusoidal AC current on single-phase AC networksi n 。
The single-stage Boost type PWM inverter solves the problems that the energy storage inductor of the traditional single-stage Boost type PWM inverter cannot release energy during the voltage reduction period to cause magnetic saturation, output waveform distortion and the like, so that the single-stage Boost type PWM inverter has the advantages of single-stage Boost conversion, high conversion efficiency (meaning small energy loss), high power density (meaning small volume and weight), wide input voltage range, low cost, wide application prospect and the like, is an ideal energy-saving and consumption-reducing single-stage inverter, provides a new method for distributed power generation of renewable energy, and has important value in the situation of vigorously advocating the construction of energy-saving and energy-saving society at present.
In this embodiment, the single-phase filter is a first-order C filter or a second-order CL filter, and is mainly used for filtering current ripples at the output side of the inverter bridge. The condition of first-order C filtering is adopted, so that the method is suitable for inversion occasions with low requirements on the quality of output waveforms; the condition of second-order CL filtering is adopted, and the method is suitable for inversion occasions with high requirements on the quality of output waveforms. The embodiment also provides two specific circuit topologies of first-order C filtering and second-order CL filtering, as shown in fig. 7 and 8.
The inverter can convert unstable low-voltage direct current (such as a storage battery, a photovoltaic cell, a fuel cell, a wind turbine and the like) into required stable, high-quality, high-voltage and single-phase sinusoidal alternating current, and is widely applied to civil industrial inverter power supplies (such as a communication inverter and a photovoltaic grid-connected inverter, 24VDC/220V50HzAC, 24VDC/110V60HzAC, 48VDC/220V50HzAC and 48VDC/110V60 HzAC) and national defense industrial inverter power supplies (such as an aviation static converter, 27VDC/115V400 HzAC) and the like in medium and small capacity boosting occasions.
The invention can adopt an off-grid control strategy of output voltage feedback and a grid-connected control strategy of output current feedback. Taking the case of off-grid operation of a single-stage single-phase current-type inverter using a first-order C-filter energy storage inductor in parallel with an active snubber circuit as shown in fig. 7 as an example, the output voltage feedback control strategy is shown in fig. 9, and the control principle waveform is shown in fig. 10.
As can be seen from fig. 9, when the single-stage single-phase current type inverter with the energy storage inductor connected in parallel with the active snubber circuit works off-grid, the circuit sets a limit value of the voltage of the snubber capacitorU Cb *Current limit value of energy storage inductorI L *And an inverter output voltage reference valueu ref System sampling and feedback buffer capacitor voltageu Cb Energy storage inductive currenti L And inverter output voltageu n Obtained by appropriate logical relationshipsS 1~S 6The purpose of obtaining the control principle waveform shown in fig. 10 is achieved.
According to the control strategy of fig. 9, five circuit modes, namely, an energy storage inductor magnetizing mode, a buffer capacitor discharging mode, a buffer capacitor charging mode, an inverter bridge positive half-cycle energy feedback mode and an inverter bridge negative half-cycle energy feedback mode, exist when the single-stage single-phase current type inverter with the energy storage inductor connected in parallel with the active buffer circuit normally works, the switch equivalent circuits of the single-stage single-phase current type inverter are respectively shown in fig. 11, 12, 13, 14 and 15, and the thick solid lines in the drawing represent the current flowing paths.
Because the circuit working states corresponding to the positive half cycle and the negative half cycle of the output voltage are symmetrical, the inverter works in the positive half cycle of the output voltage, namelyu n >The case of 0 is taken as an example, the inverter operating principle is introduced:
when the state quantity in the circuit is satisfiedi L <I L *And isu Cb <U Cb *In the meantime, the inverter works in the energy storage inductor magnetizing mode during DTs and the inverter bridge positive half cycle energy feeding mode during (1-D) Ts in each high frequency switching period, and the switching equivalent circuits are respectively shown in fig. 11 and 14.
When the state quantity in the circuit is satisfiedi L <I L *And isu Cb >U Cb *In the meantime, the inverter works in a buffer capacitor discharge mode during DTs and an inverter bridge positive half cycle energy feedback mode during (1-D) Ts in each high-frequency switching period, and the switching equivalent circuits of the inverter are respectively shown in fig. 12 and 14.
When the state quantity in the circuit is satisfiedi L >I L *When the inverter is operating in the buffer capacitor charging mode during DTs for each high frequency switching cycle, andin the (1-D) Ts period, the positive half cycle energy feedback mode of the inverter bridge is shown in FIGS. 13 and 14, respectively.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (3)
1. The single-stage single-phase current type inverter is characterized by comprising an energy storage inductor, a single-phase inverter bridge and an output filter which are sequentially cascaded, wherein the active buffer circuit is connected in parallel at two ends of the energy storage inductor, the active buffer circuit comprises a buffer capacitor, two diodes and two fully-controlled power switches, and the single-phase inverter bridge mainly comprises four fully-controlled power switches;
the active snubber circuit includes a fifth power switchS 5And a sixth power switchS 6The fifth diodeD 5The sixth diodeD 6And a buffer capacitorC b Said fifth power switchS 5Drain electrode of, fifth diodeD 5Cathode and buffer capacitorC b Is connected to a sixth power switchS 6Source electrode of, sixth diodeD 6The anodes of the two capacitors are all connected with a buffer capacitorC b Is connected to the other end of the fifth power switchS 5Source and sixth diodeD 6Is connected to the cathode of the sixth power switchS 6Drain electrode of and fifth diodeD 5The anodes of the anode groups are connected; one end of the energy storage inductor and the fifth power switchS 5Source electrode of, sixth diodeD 6Is connected with the cathode of the energy storage inductor, and the other end of the energy storage inductor is connected with the sixth power switchS 6Drain electrode of, fifth diodeD 5Are connected with each other.
2. The single-stage single-phase current mode inverter with an energy storage inductor connected in parallel with an active snubber circuit as claimed in claim 1, wherein the two fully-controlled power switches of the active snubber circuit are two-quadrant power switches capable of withstanding bi-directional voltage stress and uni-directional current stress.
3. The single-stage single-phase current mode inverter with an energy storage inductor connected in parallel with an active snubber circuit as claimed in claim 1, wherein the two fully-controlled power switches of the active snubber circuit are two-quadrant power switches capable of withstanding unidirectional voltage stress and bidirectional current stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910642799.7A CN110350816B (en) | 2019-07-16 | 2019-07-16 | Single-stage single-phase current type inverter with energy storage inductor connected with active buffer circuit in parallel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910642799.7A CN110350816B (en) | 2019-07-16 | 2019-07-16 | Single-stage single-phase current type inverter with energy storage inductor connected with active buffer circuit in parallel |
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| CN110350816A CN110350816A (en) | 2019-10-18 |
| CN110350816B true CN110350816B (en) | 2020-10-09 |
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| CN111865132B (en) * | 2020-08-26 | 2024-02-09 | 阳光电源（上海）有限公司 | Single-phase inverter, inverter topology circuit and control method thereof |
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