CN203827196U - Soft switch power electronic transformer - Google Patents
Soft switch power electronic transformer Download PDFInfo
- Publication number
- CN203827196U CN203827196U CN201420168631.XU CN201420168631U CN203827196U CN 203827196 U CN203827196 U CN 203827196U CN 201420168631 U CN201420168631 U CN 201420168631U CN 203827196 U CN203827196 U CN 203827196U
- Authority
- CN
- China
- Prior art keywords
- transformer
- inverter
- rectifier
- sub
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000002955 isolation Methods 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000009711 regulatory function Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The utility model provides a soft switch power electronic transformer comprising an input rectification circuit, an intermediate isolation stage, and a DC-AC inverter. The intermediate isolation stage comprises an inverter, a transformer, a rectifier, a clamping circuit, and a clamping capacitor. The clamping circuit comprises a first capacitor, a second capacitor, and two gating devices. Being in anti-parallel connection, the two gating devices are connected between one output end of the rectifier and one end of the clamping capacitor. The first capacitor is connected between two output ends of the rectifier. The two ends of the second capacitor are connected with the two ends of the clamping capacitor, respectively. The soft switch power electronic transformer is simple in structure and easy to produce in engineering.
Description
Technical field
The utility model relates to power technology field, relates in particular to a kind of soft switched power electronic transformer.
Background technology
Electric power electric transformer (PET) is a kind of Technics of Power Electronic Conversion technology and the transformation of electrical energy technology based on electromagnetic induction principle to be combined, and realizes the novel intelligent transformer that a kind of electric energy of electrical nature is changed into the electric energy of another kind of electrical nature.It also can complete Waveform Control, trend control or quality of power supply regulatory function when completing the functions such as conventional transformer transformation, isolation, energy transmission, so it possesses the many problems that face in electric power system that solve.Yet, being limited to the voltage withstand class of power device, electric power electric transformer adopts the mode of multi-module cascade to move mostly, and switching loss during a large amount of power devices work becomes the main loss mode of PET.
The effective way that solves switching loss is to adopt soft switch technique." soft switch " refers to zero voltage switch (Zero Voltage Switching, ZVS) or Zero Current Switch (Zero Current Switching, ZCS).It is application resonance principle, electric current (or voltage) in the switching tube of switch converters is changed by sine or quasi sine rule, during when electric current natural zero-crossing or when voltage zero-cross, make device open or turn-off, thereby switching device loss can be reduced even to reduce to greatly zero.Therefore, soft switch technique will reduce switching loss greatly in the application of electric power electric transformer, improve its performance.
The schematic diagram of the full-bridge converter in a kind of soft switched power electronic transformer as shown in Figure 1, leading-bridge S1 and S2 junction capacitance C1 in parallel and C3, lagging leg is shunt capacitance not, the equal parallel diode of each brachium pontis.At the former limit of transformer serial connection capacitance, secondary forms CDD clamp circuit by Cc, Dc and Dh, and leading-bridge switching device works in ZVS mode, and lagging leg switching tube is realized Zero Current Switch.
Be illustrated in figure 2 the ZCS that a kind of method that secondary adds auxiliary passive and nondestructive clamper realizes lagging leg.In primary side the time of secondary side transmitting energy, give the capacitor charging in passive and nondestructive network, in the afterflow stage, because transformer primary polygonal voltage reduces, transformer secondary voltage reduces thereupon, the diode current flow being meanwhile in series with electric capacity, and the voltage in electric capacity is oppositely added in the former limit of transformer by secondary, the electric current of transformer primary side that resets, thus realize the ZCS of lagging leg.
It is relatively many that but soft switched power electronic transformer of the prior art is realized electronic device used, and can reset rapidly in order to ensure primary current, just must guarantee that clamping capacitance is enough large, if but clamping capacitance is excessive, can have influence on loading range and maximum duty cycle again.Therefore clamp capacitor size is not easy design.
Utility model content
It is a kind of simple in structure that the purpose of this utility model is to provide, the soft switched power electronic transformer that design complexities is low.
In order to achieve the above object, the utility model provides a kind of soft switched power electronic transformer, comprises input rectification circuit, intermediate isolating level and DC-AC inverter,
Described intermediate isolating level comprises: inverter, transformer, rectifier, clamp circuit and clamp capacitor, and wherein, the DC side of described inverter is connected with the DC output end of described input rectification circuit, and AC connects the former side of described transformer; The AC of described rectifier connects the pair side of described transformer, and the DC side of described rectifier is connected with described clamp capacitor, and described clamp capacitor is connected with described DC-AC inverter, and described clamp circuit is connected in parallel on the two ends of described clamp capacitor;
Described clamp circuit comprises the first electric capacity, the second electric capacity, two gating devices, after two gating device reverse parallel connections, be connected between one of them output and one end of clamp capacitor of described rectifier, the first electric capacity is connected between two outputs of described rectifier, and the two ends of the second electric capacity are parallel to the two ends of described clamp capacitor.
Preferably, described input rectification circuit comprises the sub-rectification circuit of a plurality of cascades, described intermediate isolating level comprises a plurality of sub-isolation levels, each sub-isolation level comprises an inverter, a transformer, a rectifier, a clamp circuit and a clamp capacitor, each sub-isolation level is connected with a sub-rectification circuit, and each sub-isolation level parallel connection is input to described DC-AC inverter.
Preferably, the leading-bridge of described inverter is also parallel with junction capacitance.
Preferably, described gating device is diode, and the anodic bonding of diode is to one end of clamp capacitor, and negative electrode is connected to an output of rectifier.
Preferably, described rectifier comprises four groups of insulated gate bipolar transistors and fly-wheel diode, and four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
In the Monophase electric power electronic transformer that the utility model provides, at transformer secondary, add clamp circuit, and clamp circuit only uses four components and parts to realize, compare with soft switch electronic power transformer of the prior art, the components and parts that use greatly reduce, and structure is more simple.And the big or small design of clamp capacitor is very simple.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the full-bridge converter in a kind of soft switched power electronic transformer of the prior art;
Fig. 2 is the schematic diagram of the full-bridge converter in the soft switched power electronic transformer of another kind of the prior art;
Fig. 3 is the structural representation of a kind of soft switched power electronic transformer of the utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection range of the present utility model with this.
The utility model provides a kind of soft switched power electronic transformer, as shown in Figure 3, comprising: input rectification circuit 100, intermediate isolating level and DC-AC inverter 300,
Intermediate isolating level comprises: inverter 210, transformer 220, rectifier 230, clamp circuit 240 and clamp capacitor Co, and wherein, the DC side of inverter 210 is connected with the DC output end of input rectification circuit 100, the former side of AC connection transformer 220; The pair side of the AC connection transformer 220 of rectifier 230, the DC side of rectifier 230 is connected with clamp capacitor Co, and clamp capacitor Co is connected with inverter 300, and clamp circuit 240 is connected in parallel on the two ends of clamp capacitor Co;
Wherein, clamp circuit 240 comprises the first capacitor C c, the second capacitor C o1, two gating device Vd and Dc, after two gating device reverse parallel connections, be connected between one of them output and one end of clamp capacitor of described rectifier, the first capacitor C c is connected between two outputs of described rectifier, and the two ends of the second capacitor C o1 are connected in parallel on the two ends of described clamp capacitor Co.
The specific works principle of the soft switched power electronic transformer that the utility model provides is: in leading-bridge switching process, the junction capacitance generation resonance of the leakage inductance Lr of transformer and leading arm parallel connection, is easy to realize ZVS thereby its energy is enough to take away the electric charge of shunt capacitance on leading-bridge.In lagging leg switching process, when secondary side rectifier bridge output voltage drops to when voltage on clamp capacitor Co equates, gating device Dc1 conducting, the voltage at the first capacitor C c two ends is clamped on output main circuit, and there is partial action on transformer leakage inductance, cause primary current to reduce fast, thereby primary current is recovered rapidly.For lagging leg, can within the scope of whole input voltage and load variations, realize Zero Current Switch.
Preferably, as shown in Figure 3, input rectification circuit 100 comprises the sub-rectification circuit of a plurality of cascades, intermediate isolating level 200 comprises a plurality of sub-isolation levels, each sub-isolation level comprises an inverter 210, transformer 220, rectifier 230, clamp circuit 240 and a clamp capacitor Co, each sub-isolation level shares a clamp capacitor Co, and each sub-isolation level is connected with a sub-rectification circuit.
In this way, can share the electric current on modules, allow to use each circuit structure in the soft switched power electronic transformers such as transistor in high-tension circuit, thereby reduce volume and the cost of electric power electric transformer.
In Fig. 3, also show a kind of preferred enforcement structure of input rectification circuit in the soft switched power electronic transformer that the utility model provides, comprise four power devices and a DC energy storage electric capacity, a power device comprises an insulated gate bipolar transistor and a fly-wheel diode, and four groups of power devices become H bridge construction to connect.
Preferably, two gating devices are diode.
In Fig. 3, also show a kind of preferred enforcement structure of inverter in the soft switched power electronic transformer that the utility model provides, the power device that comprises four series connection, each power device comprises an insulated gate bipolar transistor and a fly-wheel diode, and wherein the upper power device of leading-bridge is also parallel with a junction capacitance.
In Fig. 3, also show a kind of preferred enforcement structure of rectifier in the soft switched power electronic transformer that the utility model provides, comprise four power devices, a power device comprises an insulated gate bipolar transistor and a fly-wheel diode, and four groups of power devices become H bridge construction to connect.
As shown in Figure 3, for the utility model also provides a kind of structural representation of preferred input rectification circuit, wherein each sub-rectification circuit comprises power device and a DC energy storage electric capacity of two series connection, each power device comprises an insulated gate bipolar transistor and a fly-wheel diode, and the insulated gate bipolar transistor of each power device becomes H bridge construction to be connected with fly-wheel diode.
Preferably, as shown in Figure 3, on the leading-bridge of inverter, be also parallel with junction capacitance.In this way, the burr bringing in the time of can eliminating corresponding switching device switch.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (5)
1. a soft switched power electronic transformer, comprises input rectification circuit, intermediate isolating level and DC-AC inverter, it is characterized in that,
Described intermediate isolating level comprises: inverter, transformer, rectifier, clamp circuit and clamp capacitor, and wherein, the DC side of described inverter is connected with the DC output end of described input rectification circuit, and AC connects the former side of described transformer; The AC of described rectifier connects the pair side of described transformer, and the DC side of described rectifier is connected with described clamp capacitor, and described clamp capacitor is connected with described DC-AC inverter, and described clamp circuit is connected in parallel on the two ends of described clamp capacitor;
Described clamp circuit comprises the first electric capacity, the second electric capacity, two gating devices, after two gating device reverse parallel connections, be connected between one of them output and one end of clamp capacitor of described rectifier, the first electric capacity is connected between two outputs of described rectifier, and the two ends of the second electric capacity are parallel to the two ends of described clamp capacitor.
2. transformer as claimed in claim 1, it is characterized in that, described input rectification circuit comprises the sub-rectification circuit of a plurality of cascades, described intermediate isolating level comprises a plurality of sub-isolation levels, each sub-isolation level comprises an inverter, a transformer, a rectifier, a clamp circuit, each sub-isolation level shares a clamp capacitor, and each sub-isolation level is connected with a sub-rectification circuit, and each sub-isolation level parallel connection is input to described DC-AC inverter.
3. transformer as claimed in claim 1, is characterized in that, the leading-bridge of described inverter is also parallel with junction capacitance.
4. transformer as claimed in claim 1, is characterized in that, described gating device is diode.
5. transformer as claimed in claim 1, is characterized in that, described rectifier comprises four groups of insulated gate bipolar transistors and fly-wheel diode, and four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420168631.XU CN203827196U (en) | 2014-04-04 | 2014-04-04 | Soft switch power electronic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420168631.XU CN203827196U (en) | 2014-04-04 | 2014-04-04 | Soft switch power electronic transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203827196U true CN203827196U (en) | 2014-09-10 |
Family
ID=51482656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420168631.XU Expired - Lifetime CN203827196U (en) | 2014-04-04 | 2014-04-04 | Soft switch power electronic transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203827196U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973129A (en) * | 2014-04-04 | 2014-08-06 | 广西电网公司电力科学研究院 | Soft-switching power electronic transformer |
-
2014
- 2014-04-04 CN CN201420168631.XU patent/CN203827196U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973129A (en) * | 2014-04-04 | 2014-08-06 | 广西电网公司电力科学研究院 | Soft-switching power electronic transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102005957B (en) | Single-power supply cascade multi-level converter | |
| CN202444440U (en) | Bridgeless inverter circuit and solar bridgeless inverter | |
| CN100405727C (en) | PWM combined three level DC converter for zero voltage current switch | |
| WO2015101142A1 (en) | Bidirectional transmission convertor suitable for high voltage and high power | |
| CN103427657B (en) | A kind of high-voltage DC-DC conversion device | |
| CN103401461B (en) | A kind of high frequency boosting isolated inverter | |
| CN202535290U (en) | Photovoltaic inverter circuit | |
| CN104638940A (en) | Modular multi-level power electronic transformer based on cascading | |
| CN103887981A (en) | Full-bridge DC-DC converter | |
| CN202586797U (en) | Five-level variable-current topological structure with bidirectional power switches and application thereof | |
| CN102664546A (en) | Five-level current transformation topological structure with bi-directional power switch and applications thereof | |
| CN104601003A (en) | Power electronic transformer based on modular multilevel converter | |
| CN105356784A (en) | Grid connected inverter with DC bus voltage balance function | |
| CN203327305U (en) | Bridge-free PFC plus T type three-level inversion frequency-conversion light modulator | |
| CN204190626U (en) | Four-quadrant diode clamp formula three level power converter | |
| CN203466729U (en) | Multi-level LLC converter | |
| CN102291020A (en) | Alternating-current push-pull conversion-single-diode rectification AC-DC (alternating current-to-direct current) converter | |
| CN102170244A (en) | Cascaded multi-level current transformer of shared power supply | |
| CN103973129A (en) | Soft-switching power electronic transformer | |
| CN204707055U (en) | A kind of Novel photovoltaic grid-connected inverter | |
| CN204442168U (en) | A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter | |
| CN204497990U (en) | ITVDC converter unit and high pressure Sofe Switch DC power supply | |
| CN207782664U (en) | Three Level Full Bridge Sofe Switch convertor circuits, welding machine, electrolysis water power supply and charger | |
| CN203827196U (en) | Soft switch power electronic transformer | |
| CN207053401U (en) | A kind of DC DC dc sources isolated variable system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140910 |