CN1139176C - Passive Lossless Snubber Circuit for Inverter Bridge - Google Patents
Passive Lossless Snubber Circuit for Inverter Bridge Download PDFInfo
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- CN1139176C CN1139176C CNB991099192A CN99109919A CN1139176C CN 1139176 C CN1139176 C CN 1139176C CN B991099192 A CNB991099192 A CN B991099192A CN 99109919 A CN99109919 A CN 99109919A CN 1139176 C CN1139176 C CN 1139176C
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- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 abstract description 33
- 238000000034 method Methods 0.000 description 8
- 230000002459 sustained effect Effects 0.000 description 7
- 230000003139 buffering effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
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Abstract
The present invention discloses passive loss-free buffer circuit for an inversion bridge. One end of an inductor Ls and one end of a capacitor Co are both connected with the flywheel diode of one bridge arm of an inversion bridge. The other end of the inductor Ls is connected with the Dc terminal of a diode of a T-shaped circuit and one terminal of a power supply, and the other end of the capacitor Co is connected with the Ds terminal of the diode of the T-shaped circuit. The capacitor Cs of the T-shaped circuit is connected with the connection point of an upper bridge arm and a lower bridge arm of the inversion bridge. One end of the series circuit of a diode Do and an inductor Lo is connected with the connection point of the capacitor Co and the diode Ds, and the other end is connected with the flywheel diode of the other bridge arm of the inversion bridge and the other terminal of the power supply.
Description
The present invention relates to the passive loss-free buffer circuit that inverter bridge is used.
Turning on and off of switching device adopts buffer circuit can reduce switching loss in the high power contravariant bridge, improve operating frequency, reduce electromagnetic interference and inverter bridge volume, the buffer circuit that adopts has two kinds now, a kind of is the passive buffer circuit that contains resistance, its energy loss is big, energy consumption becomes heat energy during work on resistance, cause the inverter bridge operating efficiency to descend, another kind is the active buffer circuit with assist control switch, though its non-resistance loss, the control circuit complexity, the cost height, functional reliability is relatively poor.
In view of above-mentioned, the purpose of this invention is to provide the passive loss-free buffer circuit that a kind of passive, lossless, good reliability, inverter bridge simple in structure, that efficient is high are used.
For achieving the above object, the passive loss-free buffer circuit that inverter bridge provided by the invention is used is by inductance, the circuit that electric capacity and diode constitute, it comprises inductance L s, capacitor C o, quantity identical with brachium pontis quantity on the inverter bridge by diode Dc, Ds and capacitor C s one end connect the T type circuit of formation and the circuit that is in series by diode Do and inductance L o altogether, wherein the polarity of the diode Ds of T type circuit and Dc tie point is opposite, that is: diode Ds negative electrode connects diode Dc anode, perhaps diode Ds anode connects diode Dc negative electrode, the end of inductance L s and capacitor C o altogether with inverter bridge wherein the fly-wheel diode of a brachium pontis link to each other, the other end of inductance L s links to each other with the diode Dc end of T type circuit and connects power supply terminal altogether, the other end of capacitor C o links to each other with the diode Ds end of T type circuit, on the capacitor C s and inverter bridge of T type circuit, the contact of following brachium pontis links to each other, one of diode Do and inductance L o series circuit is terminated on the contact of capacitor C o and diode Ds, the other end links to each other with the fly-wheel diode of another brachium pontis of inverter bridge and connects the power supply another terminal altogether, the polarity of diode Do with by inductance L o, diode Ds, Ds in the branch road that Dc constitutes, the polarity unanimity of Dc.Like this, the switching device buffering of utilizing capacitance voltage not suddenly change can to make inverter bridge is turn-offed, utilize inductive current not suddenly change and make converter bridge switching parts device buffering open-minded, and by electric capacity, inductance with power conversion to load or power supply.
The passive loss-free buffer circuit that inverter bridge of the present invention is used is owing to all adopt passive component to form, the resistive element that had not both had power consumption, also do not have auxiliary switch and corresponding auxiliary switch control circuit, so it is not only simple in structure, cost is low, and functional reliability is strong, efficient is high.
Below in conjunction with accompanying drawing the present invention is described in detail:
Fig. 1 is a forming circuit example of the present invention;
Fig. 2 is that the present invention constitutes another practical circuit;
Fig. 3 is the example that the present invention is used for half-bridge converter;
With reference to Fig. 1, inverter bridge is by switching element T 1, T2 among the figure, and the semi-bridge inversion bridge that sustained diode 1, D2 constitute is used for the buffer circuit of this inverter bridge.It comprises inductance L s, capacitor C o, by diode Dc, .Ds connect the T type circuit of formation and the circuit that is in series by diode Do and inductance L o altogether with capacitor C s one end, the end of inductance L s and capacitor C o links to each other with the negative pole of brachium pontis sustained diode 1 on the inverter bridge altogether, the other end of inductance L s links to each other with the diode Dc cathode terminal of T type circuit and connects power supply terminal altogether, the other end of capacitor C o links to each other with the diode Ds anode tap of T type circuit, on the capacitor C s and inverter bridge of T type circuit, the contact A of following brachium pontis links to each other, one of diode Do and inductance L o series circuit is terminated on the contact of capacitor C o and diode Ds anode, and the positive pole of brachium pontis sustained diode 2 links to each other and connects the power supply another terminal altogether under the other end and the inverter bridge.
Below in conjunction with the description of drawings operation principle:
One, supposes that load current Im flows out node A
1.T1 turn off process
T1 turn-offs after pulse is added to gate pole, and its sense of current is from power supply → Ls → Co → Ds → Cs → Im, because the voltage of capacitor C o and Cs can not suddenly change, but from U
Co+ U
Cs=0 begins charging so the voltage U of T1
T1The rising of starting from scratch realizes that T1 turn-offs cushioning effect, when the voltage of T1 equals supply voltage U
T1=U
dThe time, the D2 conducting, load current flows through D2, and energy is transferred among the Co at last among the Ls, finishes the T1 turn off process.
2.T1 opening process
When opening after pulse is added to the T1 gate pole supply voltage U
dBe added on the Ls, electric current is linear among the T1 rises, and electric current is linear among the D2 descends.Simultaneously, capacitor C o is by T1, D2, D
o, L
oDischarge releases energy, when the electric current of T1 equals load current I
T1During=Im, D2 blocking-up, L at this moment
oMiddle energy is transferred to load through Co, T1.Simultaneously, capacitor C s reaches U at last through Dc, Ls, T1 discharge
Co+ U
Cs=0.This moment the T11 voltage U
T1=0, finish the T1 opening process like this.
Two, assumed load electric current I m flows into node A
1.T2 turn off process
When turn-offing after pulse is added to the T2 gate pole, load current flows to from Cs, Dc to power supply, and loopback Cs energy is to power supply, afterwards, electric current again through Co, Dc to power supply, realize that shutoff cushions.When T2 voltage during greater than supply voltage, load current begins to flow to D1, Ls to power supply.After Im flowed to D1 fully, the T2 turn off process was finished.
2.T2 opening process.
When opening after pulse is added to the T2 gate pole supply voltage U
dAll be added to inductance L s, make the T2 electric current I
T2The linear rising, simultaneously, capacitor C o is through D1, T2, D
o, L
oDischarge.Work as I
T2During=Im, D1 disconnects, and capacitor C o is again through load, and Do, Lo discharge is shifted energy to load, and behind energy loopback Cs and Co among the last Lo, the T2 opening process is finished.
As fully visible, the inductance L s in the buffer circuit has worked the switching device buffering that makes inverter bridge and has opened effect, and capacitor C o and Cs have play a part to make converter bridge switching parts device buffering to turn-off, and capacitor C o, inductance L o transfer to load or power supply with energy.
Inverter bridge shown in Figure 2 also is by switching element T 1, T2, the semi-bridge inversion bridge that sustained diode 1, D2 constitute, the buffer circuit that is used for inverter bridge comprises inductance L s, capacitor C o equally, connects T type circuit that constitutes and the circuit that is in series by diode Do and inductance L o altogether by diode Dc, Ds and capacitor C s one end, in this example, the end of inductance L s and capacitor C o connects the positive pole of brachium pontis sustained diode 2 under the inverter bridge altogether, and diode Do is to link to each other with the negative pole of last brachium pontis sustained diode 1 with a wherein end of inductance L o series circuit.This example switching element T 1, T2 to turn on and off the same example of operation principle in full accord.
That the passive loss-free buffer circuit that inverter bridge of the present invention is used can be used for is single-phase, three-phase or heterogeneous inverter bridge, also can be used for the inverter bridge of being made up of the brachium pontis module.The present invention of being shown in Figure 3 is used for the example of half-bridge converter, in this example, be used for by switching element T 1～T4, the buffer circuit of the single-phase full bridge inverter bridge that sustained diode 1～D4 constitutes, comprise inductance L s, capacitor C o, identical by brachium pontis quantity on the series circuit of diode Do and inductance L o and quantity and the inverter bridge, i.e. two T type circuit, one of them T type circuit is by diode Dc1, Ds1, capacitor C s1 one end connects formation altogether, wherein the negative electrode of Dc1 anode and Ds1 links to each other, another T type circuit is by diode Dc2, Ds2, capacitor C s2 one end connects formation altogether, and wherein the negative electrode of Dc2 anode and Ds2 links to each other.The end of inductance L s and capacitor C o links to each other with the negative pole of brachium pontis fly-wheel diode on the inverter bridge altogether, the other end of inductance L s links to each other with the diode Dc1 of two T type circuit and the cathode terminal of Dc2, the other end of capacitor C o links to each other with the diode Ds1 of two T type circuit and the anode tap of Ds2, capacitor C s1, the Cs2 of two T type circuit all links to each other respectively with the contact of upper and lower brachium pontis, one of the negative electrode of diode Do and inductance L o series circuit is terminated on the contact of capacitor C o and diode Ds1, and the positive pole of brachium pontis fly-wheel diode links to each other under the other end and the inverter bridge.
Claims (1)
1. the passive loss-free buffer circuit used of inverter bridge, it is characterized in that it comprises first inductance (Ls), first electric capacity (Co), quantity identical with brachium pontis quantity on the inverter bridge by first diode (Dc), second diode (Ds) and second electric capacity (Cs) end connect the T type circuit of formation and the circuit that is in series by the 3rd diode (Do) and second inductance (Lo) altogether, wherein the polarity of second diode (Ds) of T type circuit and first diode (Dc) tie point is opposite, one end of first inductance (Ls) and first electric capacity (Co) altogether with inverter bridge wherein the fly-wheel diode of a brachium pontis link to each other, the other end of first inductance (Ls) links to each other with first diode (Dc) end of T type circuit and connects power supply terminal altogether, the other end of first electric capacity (Co) links to each other with second diode (Ds) end of T type circuit, on second electric capacity (Cs) of T type circuit and the inverter bridge, the contact of following brachium pontis links to each other, the 3rd diode (Do) is terminated on the contact of first electric capacity (Co) and second diode (Ds) with one of second inductance (Lo) series circuit, the other end links to each other with the fly-wheel diode of another brachium pontis of inverter bridge and connects the power supply another terminal altogether, the polarity of the 3rd diode (Do) with by second inductance (Lo), second diode (Ds), second diode (Ds) in the branch road that first diode (Dc) constitutes, the polarity unanimity of first diode (Dc).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991099192A CN1139176C (en) | 1999-06-23 | 1999-06-23 | Passive Lossless Snubber Circuit for Inverter Bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991099192A CN1139176C (en) | 1999-06-23 | 1999-06-23 | Passive Lossless Snubber Circuit for Inverter Bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1290994A CN1290994A (en) | 2001-04-11 |
| CN1139176C true CN1139176C (en) | 2004-02-18 |
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ID=5274241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991099192A Expired - Fee Related CN1139176C (en) | 1999-06-23 | 1999-06-23 | Passive Lossless Snubber Circuit for Inverter Bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1139176C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101355296B (en) * | 2008-09-23 | 2011-05-11 | 北京交通大学 | Nondestructive buffer circuit for T type converter cross shaft |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6801443B2 (en) * | 2002-11-19 | 2004-10-05 | Illinois Tool Works Inc. | Power supply with snubber circuit |
-
1999
- 1999-06-23 CN CNB991099192A patent/CN1139176C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101355296B (en) * | 2008-09-23 | 2011-05-11 | 北京交通大学 | Nondestructive buffer circuit for T type converter cross shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1290994A (en) | 2001-04-11 |
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