CN201185397Y - Quasi-square wave soft switch bidirectional variable flow circuit and converter applying the same - Google Patents
Quasi-square wave soft switch bidirectional variable flow circuit and converter applying the same Download PDFInfo
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- CN201185397Y CN201185397Y CNU2008200855442U CN200820085544U CN201185397Y CN 201185397 Y CN201185397 Y CN 201185397Y CN U2008200855442 U CNU2008200855442 U CN U2008200855442U CN 200820085544 U CN200820085544 U CN 200820085544U CN 201185397 Y CN201185397 Y CN 201185397Y
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- 230000002457 bidirectional effect Effects 0.000 title description 2
- 238000006243 chemical reaction Methods 0.000 claims description 32
- 238000004146 energy storage Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000002459 sustained effect Effects 0.000 description 14
- 208000035126 Facies Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- 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
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Abstract
The utility model discloses a quasi-square wave soft-switching two-way inverter circuit and an applicable convertor thereof. The quasi-square wave soft-switching two-way inverter circuit consists of a voltage source inverter and an auxiliary converter circuit, wherein, the voltage source inverter consists of four switch tubes and continuous current diodes connected in parallel in each switch tube; the auxiliary converter circuit consists of two converter inductors and a storage inductor which are connected through Y connection; the endpoints of the two converter inductors in the circuit are respectively connected with the midpoints of two bridge arms of the voltage source inverter; the endpoints of the storage inductors are current terminals; the two ends of the voltage source inverter bridge arms are voltage terminals. The circuit works through the two bridge arms in turn to achieve zero-voltage connection of the switch and the zero-current disconnection of the continuous current diodes. Compared with the prior hard-switching circuit, the inverter circuit is capable of reducing the turn-on loss of the switch and the turn-off loss of the diodes, and is applicable to bi-directional DC / DC converter, single-phase or multi-phase DC / AC converters, and is more applicable to improving the converter efficiency of high-power converters.
Description
Technical field
The utility model relates to the current transformer of standard square wave soft switch two-way current conversion circuit and application thereof.
Background technology
At present, be used for bidirectional, dc/DC convertor, the two-way current conversion circuit of single-phase inverter and polyphase inverter, shown in Fig. 1 (a), it is typical hard switching half-bridge circuit, wherein S1, S2 are power semiconductor switch (for example MOSFEI, IGBT, IGCT etc.), and D1, D2 are fly-wheel diode, and L0 is an energy storage inductor.The mid point K of one termination half-bridge of energy storage inductor; Another point is the inductance side output terminals A of entire circuit.This circuit can be realized two-way DC/DC current transformer, shown in Fig. 1 (b), also can realize two-way DC/AC current transformer, shown in Fig. 1 (c).V1 is the high-pressure side power supply among the figure, and V2 is the low-pressure side power supply;
Usually, when S1, D2 participate in work, when S2, D1 did not work, S1, D2 had just constituted electric energy is sent to low-pressure side from the high-pressure side reduction voltage circuit with L0; When S3, D1 participation work, when S1, D3 did not work, S3, D1 had just constituted electric energy with L0 and have been sent on high-tension side booster circuit from low-pressure side.
Can form the single-phase DC/AC current transformer of full-bridge shown in Fig. 1 (d) with the half-bridge circuit of two Fig. 1 (a), three-phase or heterogeneous DC/AC current transformer shown in Fig. 1 (e), three-phase or heterogeneous band zero line DC/AC current transformer shown in Fig. 1 (f).
Fig. 1 (a), (b), (c), (d), (e), circuit (f) all works in the hard switching condition, and loss is big, and especially the reverse recovery loss of fly-wheel diode often occupies the major part of device loss.Existing soft switch to Fig. 1 basic circuit improves circuit and mainly comprises DC side mode of resonance and load-side mode of resonance.
Improved DC side resonance type soft switch circuit as shown in Figure 2, resonant element Lf, Cf have been increased on its DC side bus, realized the action of no-voltage and Zero Current Switch, all doubled abovely, be not suitable for than the high-power applications occasion but its shortcoming is voltage, the current stress of switch.Extend a series of follow-on DC side resonance type soft switch inverter circuits on this basis, the still lossy big problem of the resonant element of DC side still is not suitable for than the high-power applications occasion.
Improved load-side resonance type soft switch circuit has the shortcoming of switching current stress increase as shown in Figure 3 too, still is not suitable for than the high-power applications occasion.
Summary of the invention
The purpose of this utility model provides the current transformer that a kind of loss is little, be applicable to more powerful standard square wave soft switch two-way current conversion circuit and application thereof.
Standard square wave soft switch two-way current conversion circuit of the present utility model, comprise voltage-type inverter bridge and auxiliary converter circuit, the voltage-type inverter bridge is made up of four switching tubes and the fly-wheel diode that is parallel to each switching tube, auxiliary converter circuit is made up of according to Y-connection two change of current inductance and energy storage inductor, the inductance value of energy storage inductor is at least 5 times of inductance value sum of two change of current inductance, the end points of two change of current inductance in the star circuit links to each other with the mid point of two brachium pontis of voltage-type inverter bridge respectively, the end points of energy storage inductor is a current terminal, and voltage-type inverter bridge brachium pontis two ends are voltage end.
The inductance value of one of them change of current inductance in the above-mentioned auxiliary converter circuit can be zero.
Use the current transformer that standard square wave soft switch two-way current conversion circuit of the present utility model can obtain following several forms:
First kind of current transformer
With the voltage end of standard square wave soft switch two-way current conversion circuit as the high-pressure side, and at the two ends, high-pressure side filter capacitor in parallel, current terminal and voltage end negative terminal be as low-pressure side, and at low-pressure side two ends parallel connection filter capacitor, constitute two-way DC/DC current transformer.
Second kind of current transformer
With the voltage end of standard square wave soft switch two-way current conversion circuit as the high-pressure side, and the bleeder circuit of forming by two capacitances in series in the parallel connection of two ends, high-pressure side, current terminal and dividing potential drop electric capacity mid point be as low-pressure side, and at the low-pressure side two ends filter capacitor in parallel, constitute two-way DC/AC current transformer.
The third current transformer
With the voltage end parallel connections of two covers or the above said standard square wave soft switch two-way current conversion circuit of two covers as the high-pressure side, and at the two ends, high-pressure side filter capacitor in parallel, each current terminal constitutes two-way DC/AC single-phase full bridge current transformer or polyphase inverter for exchanging phase line.
The 4th kind of current transformer
Two covers or two are overlapped the voltage end parallel connection of above said standard square wave soft switch two-way current conversion circuit as the high-pressure side, and the bleeder circuit of forming by two capacitances in series in the parallel connection of two ends, high-pressure side, each current terminal is for exchanging phase line, dividing potential drop electric capacity mid point is a zero line, constitutes the two-way DC/AC polyphase inverter of band zero line.
The beneficial effects of the utility model are:
Standard square wave soft switch two-way current conversion circuit increases by one group of brachium pontis than half-bridge circuit commonly used at present, and the quantity of device increases to some extent, but the voltage and current stress that device bears does not increase.Converter circuit by quasi-square wave realizes that the no-voltage of switch opens the zero-current switching with fly-wheel diode, reduces the switching loss of current transformer, has especially solved fly-wheel diode and has oppositely recovered this main loss source, can significantly improve the efficient of current transformer.Standard square wave soft switch two-way current conversion circuit of the present utility model is compared with traditional resonant type soft-switch circuit, owing to voltage, current stress do not increase, is fit to more promote than the inversion efficiency of high-power converter.
Description of drawings
Fig. 1 is hard switching half-bridge circuit and application thereof, wherein (a) is the hard switching half-bridge circuit, (b) be two-way DC/DC current transformer, (c) be two-way DC/AC current transformer, (d) be the single-phase DC/AC current transformer of full-bridge, (e) being three-phase or heterogeneous DC/AC current transformer, (f) is three-phase or heterogeneous band zero line DC/AC current transformer;
Fig. 2 is a kind of DC side resonance type soft switch circuit;
Fig. 3 is a kind of load-side resonance type soft switch circuit;
Fig. 4 is a standard square wave soft switch two-way current conversion circuit of the present utility model;
Fig. 5 is a kind of standard square wave soft switch two-way DC/DC converter that the utility model is implemented;
Fig. 6 is a kind of standard square wave soft switch two-way DC/AC converter that the utility model is implemented;
Fig. 7 is the two-way DC/AC converter of a kind of quasisqure wave soft switch single-phase full bridge that the utility model is implemented;
Fig. 8 is the two-way DC/AC converter of a kind of quasisqure wave soft switch three facies tract zero lines that the utility model is implemented;
Fig. 9 is quasisqure wave soft switch inversion circuit energy flows to low-pressure side from the high-pressure side a work wave;
Figure 10 is that quasisqure wave soft switch inversion circuit energy flows on high-tension side work wave from low-pressure side.
Embodiment
Referring to Fig. 4, standard square wave soft switch two-way current conversion circuit of the present utility model, comprise voltage-type inverter bridge and auxiliary converter circuit 110, the voltage-type inverter bridge is by four switching tube S1, S2, S3, S4 and the sustained diode 1 that is parallel to each switching tube, D2, D3, D4 forms, auxiliary converter circuit 110 is by two change of current inductance L 1, L2 and energy storage inductor L0 form according to Y-connection, the inductance value of energy storage inductor L0 is two change of current inductance L 1, at least 5 times of the inductance value sum of L2, two change of current inductance L 1 in the star circuit, the end points of L2 links to each other with the mid point of two brachium pontis of voltage-type inverter bridge respectively, the end points of energy storage inductor L0 is current terminal A, and voltage-type inverter bridge brachium pontis two ends are voltage end V1.
The inductance value of one of them change of current inductance in the above-mentioned auxiliary converter circuit 110 can be zero.
Two voltage-type brachium pontis alternation in the standard square wave soft switch two-way current conversion circuit, the work pulsewidth can be identical, also can be inequality.As the asynchronous limit of pulsewidth, wherein one group of half-bridge (S1, S2 or S3, S4) work pulsewidth is organized half-bridge (S3, S4 or S1, S2) much smaller than another, and for example ratio is below 1/5, and a road of work pulse width can be regarded as and only is used for soft switch change of current usefulness.
The pulsewidth of two-way half-bridge equates to make full use of the ducting capacity of device, shares average operating current.Then can use different devices for unequal situation.The device that for example is used for the change of current can use on state voltage to fall big but the high device of switching speed.
When two switching tube changes of current up and down of same half-bridge, brachium pontis midpoint potential generation saltus step, this moment another half-bridge midpoint potential saltus step thereupon, cause and the junction capacitance and the change of current inductance resonance of brachium pontis switching tube can destroy soft switch condition.Therefore, the voltage-type inverter bridge is in commutation course, when a switching tube of one of them half-bridge turn-offed, the instantaneous conducting of complementary switch pipe in another half-bridge was discharged to junction capacitance, and conduction duration is controlled at greater than the switching tube turn-off time, is less than in the change of current time range.
Use the current transformer that standard square wave soft switch two-way current conversion circuit of the present utility model can obtain following several forms, referring to Fig. 5～Fig. 8, Fig. 6 wherein, Fig. 7, box indicating " standard square wave soft switch two-way current conversion circuit " as shown in Figure 4 of the present utility model of " standard square wave soft switch two-way current conversion circuit " by name among Fig. 8.
First kind, as shown in Figure 5, the voltage end V1 of standard square wave soft switch two-way current conversion circuit is as the high-pressure side, and filter capacitor C1 in parallel at the two ends, high-pressure side, current terminal and voltage negative terminal be as low-pressure side V2, and at the low-pressure side two ends filter capacitor C2 in parallel, constitute two-way DC/DC current transformer.
Its operation principle is as follows:
Suppose the circuit stable state of having worked, the electric current I of energy storage inductor L0
oRemain unchanged, two kinds of working conditions arranged:
Situation 1: when energy when the high-pressure side flows to low-pressure side, four switching tubes are according to S1, S2, S3, the conducting successively of the order of S4, circuit operation such as Fig. 9, G among the figure
S1, G
S2, G
S3, G
S4The gate electrode drive signals of representing switching tube S1, S2, S3, S4 respectively, I
S1, I
S3The electric current of switching tube S1, S3, I are flow through in expression respectively
D2, I
D4The electric current of sustained diode 2, D4, U are flow through in expression respectively
S1The voltage at expression switching tube S1 two ends.The operation principle of one-period is described below:
Phase I, from t1-t2, the S1 conducting.Electric current arrives low-pressure side V2 from high-pressure side V1 through switching tube S1, change of current inductance L 1, energy storage inductor L0.
Second stage, in the t2 moment, S1 turn-offs, S2 opens, the instantaneous conducting of S4.Sustained diode 2 afterflows are arrived in the electric current change of current by S1.
Phase III, from t2-t3, S2 is open-minded.Electric current is through sustained diode 2, change of current inductance L 1, energy storage inductor L0, low-pressure side V2 afterflow.
The quadravalence section, from t3-t4, S2 turn-offs, and S3 is open-minded.Electric current by sustained diode 2 through change of current inductance L 1 and L2 gradually the change of current to switching tube S3.The D2 zero-current switching, the S3 no-voltage is open-minded.
Five-stage, from t4-t5, S3 is open-minded.Electric current arrives low-pressure side V2 from high-pressure side V1 through switching tube S3, change of current inductance L 2, energy storage inductor L0.
In the 6th stage, in the t5 moment, S3 turn-offs, S4 opens, S2 is instantaneous open-minded.Sustained diode 4 afterflows are arrived in the electric current change of current by S3.
In the 7th stage, from t5-t6, S4 is open-minded.Electric current is through sustained diode 4, change of current inductance L 2, energy storage inductor L0, low-pressure side V2 afterflow.
In the 8th stage, from t6-t7, S4 turn-offs, and S1 is open-minded.Electric current by D4 by change of current inductance L 2 and L1 gradually the change of current to switching tube S1.The D4 zero-current switching, the S1 no-voltage is open-minded.
Situation 2: when energy when low-pressure side flows to the high-pressure side, switching tube is pressed S2, S1, S4, the order of S3 is open-minded, circuit operation such as Figure 10, G among the figure
S1, G
S2, G
S3, G
S4The gate electrode drive signals of representing switching tube S1, S2, S3, S4 respectively, I
S2, I
S4The electric current of switching tube S2, S4, I are flow through in expression respectively
D1, I
D3The electric current of sustained diode 1, D3, U are flow through in expression respectively
S1The voltage at expression switching tube S1 two ends.
The operation principle of one-period is described below:
Phase I, from t1-t2, the S2 conducting.Electric current is through low-pressure side V2, energy storage inductor L0, change of current inductance L 1, switching tube S2 circulation.
Second stage, in the t2 moment, S2 turn-offs, S1 is open-minded, and S3 is instantaneous open-minded.Sustained diode 1 afterflow is arrived in the electric current change of current by S2.
Phase III, from t2-t3, S1 is open-minded.Electric current is from low-pressure side V2, through energy storage inductor L0, and change of current inductance L 1, sustained diode 1 is to high-pressure side V1.
The quadravalence section, from t3-t4, S1 turn-offs, and S4 is open-minded.Electric current by sustained diode 1 by change of current inductance L 1 and energy storage L2 gradually the change of current to switching tube S4.The D1 zero-current switching, the S4 no-voltage is open-minded.
Five-stage, from t4-t5, S4 is open-minded.Electric current is from through pressing side V2, energy storage inductor L0, change of current inductance L 2, switching tube S4 circulation.
In the 6th stage, in the t5 moment, S4 turn-offs, S3 opens, S1 is instantaneous open-minded.Sustained diode 3 afterflows are arrived in the electric current change of current by S4.
In the 7th stage, from t5-t6, S3 is open-minded.Electric current is from low-pressure side V2, through energy storage inductor L0, and change of current inductance L 2, sustained diode 3 is to high-pressure side V1.
In the 8th stage, from t6-t7, S3 turn-offs, and S2 is open-minded.Electric current by sustained diode 3 by change of current inductance L 2 and L1 gradually the change of current to switching tube S2.The D3 zero-current switching, the S2 no-voltage is open-minded.
Second kind, as shown in Figure 6, the voltage end V1 of standard square wave soft switch two-way current conversion circuit is as the high-pressure side, and in the parallel connection of two ends, high-pressure side by two capacitor C 11, the bleeder circuit that C12 is composed in series, current terminal and dividing potential drop electric capacity mid point be as low-pressure side, and at the low-pressure side two ends filter capacitor C2 in parallel, constitute two-way DC/AC current transformer.The operation principle of current transformer and first kind of two-way DC/DC current transformer are similar.
The third, as shown in Figure 7, with the voltage end V1 parallel connections of two covers or the above said standard square wave soft switch two-way current conversion circuit of two covers as the high-pressure side, and at the two ends, high-pressure side filter capacitor C1 in parallel, each current terminal A constitutes two-way DC/AC single-phase full bridge current transformer or polyphase inverter for exchanging phase line.The operation principle of current transformer and first kind of two-way DC/DC current transformer are similar.
The 4th kind, as shown in Figure 8, two covers or two are overlapped the voltage end V1 parallel connection of above said standard square wave soft switch two-way current conversion circuit as the high-pressure side, and in the parallel connection of two ends, high-pressure side by two capacitor C 11, the bleeder circuit that C12 is composed in series, each current terminal A is for exchanging phase line, and dividing potential drop electric capacity mid point N is a zero line, constitutes the two-way DC/AC polyphase inverter of band zero line.The two-way DC/DC current transformer of the operation principle of current transformer and first kind " " is similar.
Claims (6)
1. standard square wave soft switch two-way current conversion circuit, it is characterized in that comprising voltage-type inverter bridge and auxiliary converter circuit (110), the voltage-type inverter bridge is by four switching tube (S1, S2, S3, S4) and be parallel to the fly-wheel diode (D1 of each switching tube, D2, D3, D4) form, auxiliary converter circuit (110) is by two change of current inductance (L1, L2) form according to Y-connection with energy storage inductor (L0), the inductance value of energy storage inductor (L0) is two change of current inductance (L1, L2) at least 5 times of inductance value sum, two change of current inductance (L1 in the star circuit, L2) end points links to each other with the mid point of two brachium pontis of voltage-type inverter bridge respectively, the end points of energy storage inductor (L0) is current terminal (A), and voltage-type inverter bridge brachium pontis two ends are voltage end (V1).
2. standard square wave soft switch two-way current conversion circuit according to claim 1, the inductance value that it is characterized in that one of them change of current inductance in the auxiliary converter circuit (110) are zero.
3. the current transformer that standard square wave soft switch two-way current conversion circuit according to claim 1 is used, it is characterized in that voltage end (V1) with standard square wave soft switch two-way current conversion circuit is as the high-pressure side, and filter capacitor (C1) in parallel at the two ends, high-pressure side, current terminal and voltage end negative terminal are as low-pressure side (V2), and filter capacitor (C2) in parallel constitutes two-way DC/DC current transformer at the low-pressure side two ends.
4. the current transformer that standard square wave soft switch two-way current conversion circuit according to claim 1 is used, it is characterized in that voltage end (V1) with standard square wave soft switch two-way current conversion circuit is as the high-pressure side, and in the parallel connection of two ends, high-pressure side by two electric capacity (C11, C12) bleeder circuit that is composed in series, current terminal and dividing potential drop electric capacity mid point are as low-pressure side (V2), and filter capacitor (C2) in parallel constitutes two-way DC/AC current transformer at the low-pressure side two ends.
5. the current transformer that standard square wave soft switch two-way current conversion circuit according to claim 1 is used, it is characterized in that the voltage end (V1) of two covers or the above said standard square wave soft switch two-way current conversion circuit of two covers in parallel as the high-pressure side, and at two ends, high-pressure side parallel connection filter capacitor (C1), each current terminal (A) constitutes two-way DC/AC single-phase full bridge current transformer or polyphase inverter for exchanging phase line.
6. the current transformer that standard square wave soft switch two-way current conversion circuit according to claim 1 is used, it is characterized in that the voltage end (V1) of two covers or the above said standard square wave soft switch two-way current conversion circuit of two covers in parallel as the high-pressure side, and in the parallel connection of two ends, high-pressure side by two electric capacity (C11, C12) bleeder circuit that is composed in series, each current terminal (A) is for exchanging phase line, dividing potential drop electric capacity mid point (N) is a zero line, constitutes the two-way DC/AC polyphase inverter of band zero line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200855442U CN201185397Y (en) | 2008-04-15 | 2008-04-15 | Quasi-square wave soft switch bidirectional variable flow circuit and converter applying the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200855442U CN201185397Y (en) | 2008-04-15 | 2008-04-15 | Quasi-square wave soft switch bidirectional variable flow circuit and converter applying the same |
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| CNU2008200855442U Expired - Fee Related CN201185397Y (en) | 2008-04-15 | 2008-04-15 | Quasi-square wave soft switch bidirectional variable flow circuit and converter applying the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368444A (en) * | 2013-07-10 | 2013-10-23 | 温州大学 | Power paralleling system applied to megawatt-level converter |
| CN106300935A (en) * | 2009-07-20 | 2017-01-04 | 通用电气公司 | For direct current power being converted into the system of alternating electromotive force, method and apparatus |
-
2008
- 2008-04-15 CN CNU2008200855442U patent/CN201185397Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300935A (en) * | 2009-07-20 | 2017-01-04 | 通用电气公司 | For direct current power being converted into the system of alternating electromotive force, method and apparatus |
| CN103368444A (en) * | 2013-07-10 | 2013-10-23 | 温州大学 | Power paralleling system applied to megawatt-level converter |
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Granted publication date: 20090121 Termination date: 20130415 |