CN201584899U - Topological structure of power electronic transformer - Google Patents
Topological structure of power electronic transformer Download PDFInfo
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- CN201584899U CN201584899U CN200920234292XU CN200920234292U CN201584899U CN 201584899 U CN201584899 U CN 201584899U CN 200920234292X U CN200920234292X U CN 200920234292XU CN 200920234292 U CN200920234292 U CN 200920234292U CN 201584899 U CN201584899 U CN 201584899U
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Abstract
The utility model relates to a topological structure of a power electronic transformer, which comprises three stages, i.e., an input stage, an isolation stage and an output stage, wherein the structures of three phases of circuits are same, and the input ends of power converter groups of the input stage and the output stage of each single phase are connected in a star shape; the power converter adopts a bridge type topological structure, and the isolation stage comprises a high-frequency transformer of each single phase; the input end of a basic power unit of a single phase structure is connected with a capacitor in parallel, and in the basic power unit, the output end of a first power converter (1) is connected with the primary side of the high-frequency transformer (3), and the secondary side of the high-frequency transformer (3) is connected with the input end of a second power converter (2); and the output end of the basic power unit is connected with the input end of a filter (4); the output end of the filter (4) is connected with three phases of supply networks. The device can automatically adjust line output voltage, stabilize output voltage, and suppress the dropping, rising and flickering of the line voltage, over-voltage, under voltage and other voltage quality problems.
Description
Technical field
The utility model relates to a kind of electric power electric transformer that is applied in power distribution network, belongs to power electronics in the application on power system technical field.
Background technology
Power transformer has become the basic composition equipment of electrical power trans mission/distribution system, enormous amount since 19th century were invented.At present, traditional power transformer adopts iron core oil-immersed type usually, have simple, the reliability advantages of higher of manufacture craft, but shortcoming is also fairly obvious, comprise: volume, weight are big, no-load loss is higher, and there is threat in transformer oil to environment, and it mainly acts on is transformation and isolation, function ratio is more single, during core sataration, harmonic wave can be produced, when dropping into electrical network, also bigger magnetizing inrush current can be caused.The shortcoming of conventional electric power transformer and single function are difficult to satisfy the demand and the target of following power grid construction.
The notion of the electric power electric transformer seventies in last century (PET-Power electronic transformer) is suggested for this reason, and PET utilizes the power electronics commutation technique to realize voltage transformation and energy delivery.Its outstanding feature is by voltage source converter (VSC) amplitude and the phase place of its former secondary AC side voltage, electric current to be carried out the continuous controllable adjusting.Therefore, PET not only can overcome the defective of traditional transformer, can also solve the problems such as electromagnetic looped network, the quality of power supply, reactive-load dynamic compensation and the raising system stability limit that electric power system faces.
Therefore, along with power electronic device level and high frequency transformer Development of Materials, electric power electric transformer will replace traditional transformer and be widely used in electric power system.
Summary of the invention
Technical problem: the purpose of this utility model is the topological structure that proposes a kind of electric power electric transformer, realize that not only voltage transformation, electrical isolation, energy delivery can also automatically adjust to the voltage of power distribution network circuit, can be applied on the power distribution network circuit of different input voltage grades flexibly.Compare traditional power transformer, reduced the volume of transformer greatly, reduced loss, improved whole conversion efficiency, and can regulated output voltage, suppress quality of voltage problems such as the falling of line voltage distribution, rising, flickering, overvoltage and under voltage.
Technical scheme: the utility model discloses a kind of topological structure of electric power electric transformer, this device adopts three grades of formations, i.e. input stage, isolation level, output stage; The structure of three-phase circuit is identical, and the input of the power inverter group of each single-phase input stage, output stage is according to star-like connection, and power inverter adopts the bridge type topology structure; Isolation level comprises the high frequency transformer that each is single-phase; The input of phase structure prime power unit electric capacity in parallel, in the prime power unit, the former limit of the output termination high frequency transformer of first power inverter, the secondary of high frequency transformer connects the input of second power inverter; The output of prime power unit connects the input of filter, the output termination three phase supply network of filter.
The prime power unit is based on AC-AC type electric power electric transformer, first power inverter adopts first power switch unit in each phase input stage, second power switch unit, the 3rd power switch unit, the 4th power switch unit is formed the bridge type topology structure, first power switch unit, connect the former limit of high frequency transformer anode after the complementary conducting of second power switch unit, the 3rd power switch unit, connect the former limit of high frequency transformer negative terminal after the complementary conducting of the 4th power switch unit, described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT; Second power inverter adopts the 5th power switch unit in each phase output stage, the 6th power switch unit, the 7th power switch unit, the 8th power switch unit is formed the bridge type topology structure, the 5th power switch unit, the positive termination high frequency transformer secondary anode of the 7th power switch unit, the 6th power switch unit, the negative terminal of the 8th power switch unit connects high frequency transformer secondary negative terminal, the 5th power switch unit, connect the input of filter after the complementary conducting of the 6th power switch unit, the 7th power switch unit, connect the input of filter after the complementary conducting of the 8th power switch unit, described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT.
First power inverter is connected in series in each single-phase input stage; Output stage adopts the bridge power converter parallel-connection structure, filter is made up of output inductor one and output filter capacitor, output inductor one negative pole connects the 5th power switch unit, the 6th power switch unit output, the output filter capacitor negative terminal connects the 7th power switch unit, the 8th power switch unit output, positive termination output inductor one positive pole of output filter capacitor; Perhaps output stage adopts the bridge power converter cascade structure, filter is made up of the end of the same name that output filter capacitor is attempted by output inductor one, output inductor two, output inductor one negative pole connects the output of the 5th power switch unit, the 6th power switch unit in first prime power unit, and output inductor two negative poles connect the output of the 7th power switch unit, the 8th power switch unit in the 3rd the prime power unit.
Three-phase structure in this electric power electric transformer is identical, and every phase structure is formed by the prime power unit combination, and Fig. 1 is the prime power cellular construction illustraton of model of this electric power electric transformer.Its operation principle is: former side is converted into high-frequency signal with power frequency component by converters, and promptly raising frequency is coupled to pair side by middle high-frequency isolation transformer then, utilizes converters to be reduced into power frequency component again, i.e. frequency reducing.By adopting suitable controlling schemes to control the work of power electronic equipment, thereby be the electric energy of another kind of frequency, voltage, waveform with the transformation of electrical energy of a kind of frequency, voltage, waveform.Fig. 2 is the prime power unit topology diagram of this device.The prime power unit adopts three grades of formations, promptly sub-input stage, sub-isolation level, sub-output stage; Sub-input stage is made of power inverter, and power inverter adopts the bridge type topology structure, comprise power switch unit S1,
S2 and
Each power switch unit is connected to form by two IGBT and inverse parallel diode thereof, can realize the electric current two-way flow; Sub-isolation level is a high frequency transformer, can reduce device volume, improves whole efficiency, realizes the function of voltage transformation and energy delivery; Sub-output stage is made of power inverter, the same with input stage, power inverter also adopts the bridge type topology structure, comprise the 5th power switch unit, the 6th power switch unit, the 7th power switch unit, the 8th power switch unit, each power switch unit is connected to form by two IGBT and inverse parallel diode thereof, can realize the electric current two-way flow, output stage also connects filter, to improve the voltage current waveform quality.Fig. 3 is the phase structure figure that the output stage of this device adopts the power inverter parallel connection, single-phase input stage is in series by the sub-input stage power inverter of prime power unit, and at the in parallel identical capacitor of the input of each prime power unit, to realize with of the effect of input voltage mean allocation to each prime power unit; Isolation level is made of the sub-isolation level high frequency transformer of each prime power unit; Output stage is formed in parallel by the sub-output-stage power converter of prime power unit.Fig. 4 is second kind of single-phase topological structure of this device, and single-phase input stage is in series by the sub-input stage power inverter of prime power unit, and at the in parallel identical capacitor of the input of each prime power unit, to realize all pressure effects; Isolation level is made of the sub-isolation level high frequency transformer of each prime power unit; Output stage is formed by the sub-output-stage power converter cascade of prime power unit, and output stage also connects filter, to improve the voltage current waveform quality.Fig. 5 and Fig. 6 adopt the phase structure of power inverter parallel connection and the three-phase structure topological diagram of this device of the phase structure that adopts the power inverter cascade, combine by three phase structures, input stage is connected to form according to star-like by each single-phase input stage power inverter group, isolation level is made up of each single-phase isolation level high frequency transformer group, output stage by each single-phase output-stage power converter groups according to star-like connection, to adapt to the application of three-phase four-wire system circuit.
The single-phase input stage of electric power electric transformer adopts the sub-input stage power inverter by the prime power unit to be connected in series, need not to utilize and transformer coupledly just can directly import high pressure, output stage has two kinds of topological structures: first kind is to adopt the bridge power converter parallel-connection structure, second kind is to adopt the bridge power converter cascade structure, to satisfy the needs of high voltage and high power occasion.Every phase structure of whole device is combined by basic power cell, can be applied in flexibly on the distribution line of different electric pressures.Be applied in the electric power electric transformer of power distribution network, not only can substitute the conventional electric power transformer, realize the effect of voltage transformation, energy delivery, electrical isolation, can also pass through the corresponding control strategies regulated output voltage, realize the effect of voltage regulator, suppress the quality of voltage problems such as electric voltage dropping, rising, flickering, overvoltage and under voltage of circuit.
Beneficial effect: electric power electric transformer of the present utility model except the advantage that possesses the conventional electric power transformer, also has the following advantages:
1. owing to adopt high frequency transformer to carry out transformation,, improved the efficient of whole device so reduced the volume of single unit system greatly.
2. adopt the mode of prime power unit combination to constitute, be convenient to flexible Application on the power distribution network circuit of each electric pressure.Single-phase input stage adopts the input stage power inverter by the prime power unit to be connected in series, need not to utilize and transformer coupledly just can directly import high pressure, output stage adopts bridge power converter parallel-connection structure or cascade structure to satisfy the needs of high voltage and high power occasion.
3. realize the interference isolation between load and the electric power system, suppress harmonic wave, improve the electrical network electric circumstance.Adopt corresponding control strategies, can realize the function that automatic voltage is regulated, suppress the falling of line voltage distribution, rising, flickering, overvoltage and under voltage.
4. the employed device for high-power power electronic of this electric power electric transformer can instantaneous (us level) turn-off, so electric power electric transformer employing control method, can realize the fault current restriction.
5. this electric power electric transformer utilizes totally digitilized technology to realize on-line monitoring, is convenient to digital transformer substation and implements, and can save old-fashioned protective relaying device by protection and the monitoring of self simultaneously.
Description of drawings
Fig. 1: be prime power cellular construction model framework chart of the present utility model.
Fig. 2: be prime power of the present utility model unit topological structure block diagram.
Fig. 3: the phase structure figure that adopts the power inverter parallel connection for output stage.
Fig. 4: the phase structure figure that adopts the power inverter cascade for output stage.
Fig. 5: the three-phase structure figure that adopts the power inverter parallel connection for output stage.
Fig. 6: the three-phase structure figure that adopts the power inverter cascade for output stage.
Wherein have: power inverter 1, power inverter 2, high frequency transformer 3, filter 4.
The first power switch unit S1, second power switch unit
The 3rd power switch unit S2, the 4th power switch unit
The 5th power switch unit S3, the 6th power switch unit
The 7th power switch unit S4, the 8th power switch unit
Vin: single-phase device input voltage,
Vo: the uniline output voltage,
La1: output inductor one,
La2: output inductor two,
C1, C2, Cn: equalizing capacitance,
Ca1: output filter capacitor.
UA, UB, UC: three-phase power electronic transformer Input voltage terminal,
Ua, Ub, Uc, N: three-phase power electronic transformer output voltage terminal.
Embodiment
Be that specific embodiment of the utility model further describes below:
The utility model is a kind of topological structure of electric power electric transformer, and this device adopts three grades of formations, i.e. input stage, isolation level, output stage; Three-phase structure is identical, and the input of the power inverter group of each single-phase input stage, output stage is according to star-like connection, and described power inverter adopts the bridge type topology structure; Isolation level comprises the high frequency transformer group that each is single-phase; Phase structure comprises the input of prime power unit electric capacity in parallel, wherein, the former limit of the output termination high frequency transformer 3 of first power inverter 1, the secondary of high frequency transformer 3 connects the input of second power inverter 2; The output of prime power unit connects the input of filter 4, the output termination three phase supply network of filter 4.
In being applied in the electric power electric transformer of power distribution network, the prime power unit is based on AC-AC type electric power electric transformer, and first power inverter 1 adopts the bridge type topology structure by the first power switch unit S1, second power switch unit in each phase input stage
The 3rd power switch unit S2, the 4th power switch unit
Form the first power switch unit S1, second power switch unit
Connect high frequency transformer 3 former limit anodes, the 3rd power switch unit S2, the 4th power switch unit after the complementary conducting
Connect high frequency transformer 3 former limit negative terminals after the complementary conducting, described each power switch unit is composed in parallel by two IGBT and an inverse parallel diode; Second power inverter 2 adopts the bridge type topology structure by the 5th power switch unit S3, the 6th power switch unit in each phase output stage
The 7th power switch unit S4, the 8th power switch unit
Form the positive termination high frequency transformer 3 secondary anodes of the 5th power switch unit S3, the 7th power switch unit S4, the 6th power switch unit
The 8th power switch unit
Negative terminal connect high frequency transformer 3 secondary negative terminals, the 5th power switch unit S3, the 6th power switch unit
Connect the input of filter 4 after the complementary conducting, the 7th power switch unit S4, the 8th power switch unit
Connect the input of filter 4 after the complementary conducting, described each power switch unit is composed in parallel by two IGBT and an inverse parallel diode.
Output stage also can adopt the bridge power converter cascade structure, filter 4 is made up of the end of the same name that output filter capacitor Ca1 is attempted by output inductor one La1, output inductor two La2, and output inductor one La1 negative pole connects the 5th power switch unit S3, the 6th power switch unit in first prime power unit
Output, output inductor two La2 negative poles connect the 7th power switch unit S4, the 8th power switch unit in the 3rd the prime power unit
Output.
Input stage is in series by the power inverter that adopts the bridge type topology structure, to adapt to the needs that are input as different electric pressures; Isolation level adopts that a plurality of high frequency transformers are isolated respectively, the form of transformation and energy delivery; Output stage has two kinds of topological structures: first kind of power inverter parallel connection by employing bridge type topology structure constitutes, and output stage adopts the bridge power converter parallel-connection structure as shown in Figure 5, satisfies the needs of low-voltage and high-current.Second kind is to adopt the power inverter cascade of bridge type topology structure to constitute, and connects the LC filter simultaneously, and output stage adopts the bridge power converter cascade structure as shown in Figure 6, satisfies the needs of high voltage and high power, to improve the voltage current waveform quality.Whole device is combined by basic power cell, can be applied in flexibly on the power distribution network circuit of different electric pressures
Three-phase structure in this device is identical, combine by phase structure, each phase structure is made up of the prime power unit again, the operation principle of prime power unit is: former side is converted into high-frequency signal (600Hz is to 1.2kHz) with the power-frequency voltage signal by power inverter 1, it is raising frequency, be coupled to pair side by middle high-frequency isolation transformer 3 then, utilize power inverter 2 to be reduced into power-frequency voltage signal, i.e. frequency reducing again.By corresponding control, can change the amplitude of fundamental voltage output of voltage.The prime power unit adopts three grades of formations, promptly sub-input stage, sub-isolation level, sub-output stage; Sub-input stage is made of power inverter 1, and power inverter adopts the bridge type topology structure, comprises the first power switch unit S1, second power switch unit
The 3rd power switch unit S2, the 4th power switch unit
Each power switch unit is connected to form by two IGBT and inverse parallel diode thereof, can realize the electric current two-way flow; Sub-isolation level is a high frequency transformer 3, can reduce device volume, improves whole efficiency, realizes the function of voltage transformation and energy delivery; Sub-output stage is made of power inverter 2, and is the same with input stage, and power inverter adopts the bridge type topology structure, comprises power the 5th power switch unit S3, the 6th power switch unit
The 7th power switch unit S4, the 8th power switch unit
Each power switch unit is connected to form by two IGBT and inverse parallel diode thereof, can realize the electric current two-way flow, and output stage also connects filter 4, to improve the voltage current waveform quality.
The input stage of whole device phase structure is in series by the input stage power inverter of prime power unit, need not to utilize and transformer coupledly just can directly import high pressure, and at the in parallel identical capacitor of the input of each prime power unit, to realize with of the effect of input voltage mean allocation to each prime power unit; Isolation level is made of the isolation level high frequency transformer of each prime power unit; Output stage has two kinds of topological structures: first kind of output-stage power converter by the prime power unit is formed in parallel, and second kind of output-stage power converter cascade by the prime power unit forms.
The input stage of electric power electric transformer is connected to form according to star-like by each single-phase input stage power inverter group; Isolation level is made up of each single-phase isolation level high frequency transformer group, isolates, the form of transformation, energy delivery; Output stage adopts by each single-phase output-stage power converter groups according to star-like connection, to adapt to the three-phase four-wire system circuit.Adopt corresponding control strategies, can realize the function that automatic voltage is regulated, suppress quality of voltage problems such as the falling of line voltage distribution, rising, flickering, overvoltage and under voltage.
Claims (3)
1. the topological structure of an electric power electric transformer is characterized in that this device adopts three grades of formations, i.e. input stage, isolation level, output stage; The structure of three-phase circuit is identical, and the input of the power inverter group of each single-phase input stage, output stage is according to star-like connection, and power inverter adopts the bridge type topology structure; Isolation level comprises the high frequency transformer that each is single-phase; The input of phase structure prime power unit electric capacity in parallel, in the prime power unit, the former limit of the output termination high frequency transformer (3) of first power inverter (1), the secondary of high frequency transformer (3) connects the input of second power inverter (2); The output of prime power unit connects the input of filter (4), the output termination three phase supply network of filter (4).
2. the topological structure of a kind of electric power electric transformer as claimed in claim 1, it is characterized in that the prime power unit based on AC-AC type electric power electric transformer, first power inverter (1) adopts first power switch unit (S1), second power switch unit in each phase input stage
The 3rd power switch unit (S2), the 4th power switch unit
Form the bridge type topology structure, first power switch unit (S1), second power switch unit
Connect the former limit of high frequency transformer (3) anode, the 3rd power switch unit (S2), the 4th power switch unit after the complementary conducting
Connect the former limit of high frequency transformer (3) negative terminal after the complementary conducting, described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT; Second power inverter (2) adopts the 5th power switch unit (S3), the 6th power switch unit in each phase output stage
The 7th power switch unit (S4), the 8th power switch unit
Form the bridge type topology structure, positive termination high frequency transformer (3) the secondary anode of the 5th power switch unit (S3), the 7th power switch unit (S4), the 6th power switch unit
The 8th power switch unit
Negative terminal connect high frequency transformer (3) secondary negative terminal, the 5th power switch unit (S3), the 6th power switch unit
Connect the input of filter (4) after the complementary conducting, the 7th power switch unit (S4), the 8th power switch unit
Connect the input of filter (4) after the complementary conducting, described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT.
3. the topological structure of a kind of electric power electric transformer as claimed in claim 1 is characterized in that first power inverter (1) is connected in series in each single-phase input stage; Output stage adopts the bridge power converter parallel-connection structure, and filter (4) is made up of output inductor one (La1) and output filter capacitor (Ca1), and output inductor one (La1) negative pole connects the 5th power switch unit (S3), the 6th power switch unit
Output, output filter capacitor (Ca1) negative terminal connects the 7th power switch unit (S4), the 8th power switch unit
Output, positive termination output inductor one (La1) positive pole of output filter capacitor (Ca1); Perhaps output stage adopts the bridge power converter cascade structure, filter (4) is made up of the end of the same name that output filter capacitor (Ca1) is attempted by output inductor one (La1), output inductor two (La2), and output inductor one (La1) negative pole connects the 5th power switch unit (S3), the 6th power switch unit in first prime power unit
Output, output inductor two (La2) negative pole connects the 7th power switch unit (S4), the 8th power switch unit in the 3rd the prime power unit
Output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920234292XU CN201584899U (en) | 2009-08-06 | 2009-08-06 | Topological structure of power electronic transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920234292XU CN201584899U (en) | 2009-08-06 | 2009-08-06 | Topological structure of power electronic transformer |
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| CN201584899U true CN201584899U (en) | 2010-09-15 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075096A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Fault tolerance design-based high-power power electronic transformer |
| CN102820666A (en) * | 2012-08-30 | 2012-12-12 | 西安交通大学 | Three-phase power electronic transformer capable of balancing asymmetric load |
| CN104283548A (en) * | 2013-07-11 | 2015-01-14 | 德克萨斯仪器股份有限公司 | Unidirectional output stage with isolated feedback |
| CN104767393A (en) * | 2015-04-17 | 2015-07-08 | 西南交通大学 | Cascading-parallel connection mixing converter device |
| CN106786722A (en) * | 2017-01-06 | 2017-05-31 | 许继电气股份有限公司 | A kind of flexible ring device of star-like, triangular form and mixed type topological structure |
| CN110474552A (en) * | 2019-07-29 | 2019-11-19 | 南京南瑞继保工程技术有限公司 | A kind of exchange current converter |
| CN111146951A (en) * | 2020-01-20 | 2020-05-12 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control strategy thereof |
| CN112234843A (en) * | 2020-10-20 | 2021-01-15 | 华北科技学院 | Cascaded high-gain step-down power electronic transformer based on switched capacitor |
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2009
- 2009-08-06 CN CN200920234292XU patent/CN201584899U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075096A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Fault tolerance design-based high-power power electronic transformer |
| CN102820666A (en) * | 2012-08-30 | 2012-12-12 | 西安交通大学 | Three-phase power electronic transformer capable of balancing asymmetric load |
| CN102820666B (en) * | 2012-08-30 | 2015-01-07 | 西安交通大学 | Three-phase power electronic transformer capable of balancing asymmetric load |
| CN104283548B (en) * | 2013-07-11 | 2019-02-12 | 德克萨斯仪器股份有限公司 | Unidirectional output stage with isolation feedback |
| CN104283548A (en) * | 2013-07-11 | 2015-01-14 | 德克萨斯仪器股份有限公司 | Unidirectional output stage with isolated feedback |
| CN104767393A (en) * | 2015-04-17 | 2015-07-08 | 西南交通大学 | Cascading-parallel connection mixing converter device |
| CN106786722A (en) * | 2017-01-06 | 2017-05-31 | 许继电气股份有限公司 | A kind of flexible ring device of star-like, triangular form and mixed type topological structure |
| CN110474552A (en) * | 2019-07-29 | 2019-11-19 | 南京南瑞继保工程技术有限公司 | A kind of exchange current converter |
| WO2021017887A1 (en) * | 2019-07-29 | 2021-02-04 | 南京南瑞继保工程技术有限公司 | Alternating current conversion device |
| CN111146951A (en) * | 2020-01-20 | 2020-05-12 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control strategy thereof |
| CN111146951B (en) * | 2020-01-20 | 2021-08-17 | 特变电工西安电气科技有限公司 | Power electronic transformer capable of being started in two directions and control method thereof |
| CN112234843A (en) * | 2020-10-20 | 2021-01-15 | 华北科技学院 | Cascaded high-gain step-down power electronic transformer based on switched capacitor |
| CN112234843B (en) * | 2020-10-20 | 2022-03-22 | 华北科技学院 | Cascaded high-gain step-down power electronic transformer based on switched capacitor |
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Granted publication date: 20100915 Termination date: 20140806 |
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