CN2541995Y - Passive soft switching circuit of inverter bridge - Google Patents
Passive soft switching circuit of inverter bridge Download PDFInfo
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- CN2541995Y CN2541995Y CN 02215737 CN02215737U CN2541995Y CN 2541995 Y CN2541995 Y CN 2541995Y CN 02215737 CN02215737 CN 02215737 CN 02215737 U CN02215737 U CN 02215737U CN 2541995 Y CN2541995 Y CN 2541995Y
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- diode
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- inductance
- brachium pontis
- inverter bridge
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Abstract
A passive soft switch circuit of a contravariant bridge of the utility model is provided with two energy feedback circuits which are totally symmetrical and respectively and correspondingly connected with an upper and a lower bridge arms of the contravariant bridge. Each energy feedback circuit comprises two inductances, two capacitances, and three diodes, wherein, a conducting absorption inductance is connected between a power supply bus-bar and a bridge arm, a switching tube of the bridge arm is connected in parallel with a series circuit which comprises an energy storage capacitance, a first diode, and a cut-off absorption capacitance. A circuit which is connected with the other inductance and is connected in series with a second diode is connected between a joint point of the energy storage capacitance and the first diode and the midpoint of the upper and the lower bridge arms, and a third diode is connected between the joint point of the first diode and the cut-off absorption capacitance and the power supply bus-bar. The polarity of the three diodes is consistent. The utility model has the advantages of few circuit elements, simple structure, and low cost, and the circuit only comprises the inductances, the capacitances, the diodes and other passive devices. Auxiliary active devices and dissipative resistances are not included, and extra detection and control are not needed, the efficiency is high.
Description
Technical field
The utility model relates to the passive soft on-off circuit of diode clamping type multi-level inverse conversion bridge.
Background technology
The multi-electrical level inverter that is used for high pressure, large-power occasions, because its special and complicated circuit topology, corresponding soft switch circuit design is difficulty very, mainly contains two kinds of methods, and a kind of is additional active and passive component in primary circuit, realize the soft switch of power device, this method adopts number of elements many, and needs extra detection, and control is complicated, the cost height, poor reliability; Another kind is the additional passive buffer circuit that contains resistance, and its energy loss is big, and energy consumption causes the inverter bridge operating efficiency to descend on resistance during work.
Summary of the invention
It is few that the purpose of this utility model provides a kind of number of elements, simple in structure, and cost is low, need not extra detection and control, and the soft switch circuit that is used for multi-level inverse conversion bridge of noenergy loss.
The passive soft on-off circuit of inverter bridge of the present utility model have two respectively with inverter bridge on, the energy feedback circuit of the corresponding complete symmetry that connects of following brachium pontis, each energy feedback circuit is by two inductance, two electric capacity and three diodes are formed, one of them conducting absorption inductor is connected between power source bus and the brachium pontis, the switching tube of this brachium pontis with by storage capacitor, the series circuit that first diode and shutoff absorb the electric capacity formation is in parallel, tie point at storage capacitor and first diode is supreme, connect another inductance and second circuit that diode is in series between the mid point of following brachium pontis, to inserting the 3rd diode between the power source bus, the polarity of above-mentioned three diodes is consistent at first diode and the tie point that turn-off to absorb electric capacity.
During work, under the effect of conducting absorption inductor, device for power switching is realized zero current turning-on, under the effect that absorbs electric capacity, realize that the no-voltage of power device turn-offs, the energy during the temporary switch of storage capacitor, and finally by the energy regenerative branch road with these energy feedings to power supply or load.
The passive soft on-off circuit element of inverter bridge of the present utility model is few, simple in structure, cost is low, this circuit only comprises inductance, passive device such as electric capacity, diode, do not comprise auxiliary active device and dissipative cell resistance, thus need not extra detection and control, and can improve the efficient of multi-level inverse conversion brachium pontis.
Description of drawings
Fig. 1 is the utility model forming circuit example;
Fig. 2 is that the utility model constitutes another practical circuit;
Fig. 3 is the application example of the utility model in the three-phase tri-level inverter.
Embodiment
With reference to Fig. 1, be illustrated as three-level inverters, it is by switching tube S1～S4, and sustained diode 1～D4 and two clamping diode Dc1, Dc2 constitute.The passive soft on-off circuit that is used for this inverter bridge have two respectively with inverter bridge, the energy feedback circuit of the corresponding complete symmetry that connects of following brachium pontis, first energy feedback circuit is by two inductance L s1, Lr1, two capacitor C b1, Cs1 and three diode Ds11, Ds21, Dr1 forms, one of them conducting absorption inductor Ls1 is connected between power source bus and the brachium pontis, the switching tube S1 of this brachium pontis with by storage capacitor Cb1, the series circuit that first diode Ds11 and shutoff absorb capacitor C s1 formation is in parallel, tie point at storage capacitor Cb1 and first diode Ds11 is supreme, connect another inductance L r1 and second circuit that diode Dr1 is in series between the mid point of following brachium pontis, absorb the tie point of capacitor C s1 to inserting the 3rd diode Ds12, above-mentioned three diode Ds11 between the power source bus at first diode Dsll and shutoff, Dr1, the polarity of Ds12 is consistent.
Second energy feedback circuit is by two inductance L s2, Lr2, two capacitor C b2, Cs2 and three diode Ds21, Ds22, Dr2 forms, one of them conducting absorption inductor Ls2 is connected between power source bus and the brachium pontis, the switching tube S4 of this brachium pontis with by storage capacitor Cb2, the series circuit that first diode Ds21 and shutoff absorb capacitor C s2 formation is in parallel, tie point at storage capacitor Cb2 and first diode Ds21 is supreme, connect another inductance L r2 and second circuit that diode Dr2 is in series between the mid point of following brachium pontis, absorb the tie point of capacitor C s2 to inserting the 3rd diode Ds22, above-mentioned three diode Ds21 between the power source bus at first diode Ds21 and shutoff, Dr2, the polarity of Ds22 is consistent.
In order to reduce the shutoff voltage stress of power device, inductance L r1, Lr2 in above-mentioned two energy feedback circuits can be replaced with DC power supply Vdc1, Vdc2 respectively, at the mid point of the upper and lower brachium pontis of inverter bridge to access inductance L r between the contact of DC power supply Vdc1 and diode Dr2.(as shown in Figure 2).
With the tri-level inversion brachium pontis is example, and three kinds of on off state combinations are arranged in three-level inverters:
1) S1, S2 are open-minded, and S3, S4 turn-off;
2) S2, S3 are open-minded, and S1, S4 turn-off;
3) S3, S4 are open-minded, and S1, S2 turn-off, and four kinds of change of current situations should be arranged mutually, are respectively S1 and Dc1; S2 and D4; S3 and D1; The change of current between S4 and the Dc2.Because the symmetry of circuit structure, only the commutation course with S1 and Dc1 and S3 and D1 is that example is analyzed as follows:
The commutation course of S1 and Dc1:
Before the change of current, circuit is in the stable state of S1 current-carrying, and the change of current begins, S1 turn-offs, S3 is open-minded, and S1 realizes that by Cb1, Ds11, the bypass of Cs1 capacitive branch the no-voltage of S1 pipe is turn-offed, because of inductance L s1, Lr1 electric current can not suddenly change, the S3 pipe is opened and is cushioned, and realizes zero current turning-on, busbar voltage Ud, capacitor C b1 terminal voltage equivalent voltage source E, inductance L s1, capacitor C s1 series resonance, Lr1 and Cs1 series resonance charge to Ud up to Cs1 simultaneously.The Ls1 electric current is through Cb1-Ds11-Ds12 subsequently, and energy delivery is to Cb1, and when the absorption inductor electric current returned zero, S1 turn-offed, and S3 opens commutation course and finishes.
S3 pipe cut-off signals and S1 pipe are opened signal and are provided simultaneously, circuit enters another change of current transient state, inductance L s1 bears bus supply voltage Ud, Lr1 bears voltage E, the S1 electric current is linear to rise, the Dc1 electric current is linear to descend, realized the restriction of current changing rate when the zero current turning-on of S1 and clamping diode Dc1 turn-off, after clamping diode Dc1 electric current got back to zero, S3 began to bear voltage, Ls1, after the Cs1 parallel connection and Lr1, Ud, the Cb1 series connection produces resonance, up to Cs1 voltage arrival-E, two inductance L s1, Lr1 bears load current together, respectively bears the voltage of 1/2 (Ud-E), the current changing rate that equates with absolute value reaches steady-state value: iLs1=Iload, iLr1=0.It is open-minded to finish S1, the commutation course that S3 turn-offs.
The commutation course of S3 and D1:
Before the change of current, circuit is in the stable state of S3 current-carrying, the change of current begins, and S3 turn-offs, and the S1 pipe is open-minded, the load current Cs1-Ds12 that changes one's profession, CS1 discharges by Ds12-Ls1-S1 simultaneously, and the S3 pipe has been realized the no-voltage shutoff like this, and the S1 pipe is realized zero current turning-on, when Cs1 voltage arrival-E, big of electric current is the bypass of Cb1 institute, load current Cb1 (the Cs1)-Ds11 (Ds12) that flows through, and the LS1 cross-over connection is in the Cb1 two ends, energy shifts to Cb1, its electric current is linear to descend, and arrives negative load current up to the Ls1 electric current, and S1 (D1) pipe is opened, the S3 pipe turn-offs commutation course and finishes.
The S1 pipe turn-offs, the S3 pipe is opened signal and provided simultaneously, Ls1 bears bus supply voltage Ud, and Lr1 bears Cb1 voltage E, and the S3 pipe is realized zero current turning-on, the anti-also diode D1 cut-off current rate of change of S1 pipe obtains restriction, the D1 electric current drops to zero, and S1 begins to bear voltage, Ud, Ls1, Cb1, Cs1 resonance, after Cs1 voltage reaches Ud, two inductance L s1, Lr1 respectively bear the voltage of 1/2 (Ud-E), and the current changing rate that equates with absolute value reaches steady-state value: iLs1=0, iLr1=0.It is open-minded to finish the S3 pipe, the commutation course that S1 (D1) pipe turn-offs.
The utility model is suitable for various single-phase, three-phase, and the inverter bridge of heterogeneous any level as shown in Figure 3, is the application of the utility model in the three-phase tri-level inverter bridge.
Claims (2)
1. the passive soft on-off circuit of inverter bridge, it is characterized in that having two respectively with inverter bridge on, the energy feedback circuit of the corresponding complete symmetry that connects of following brachium pontis, each energy feedback circuit is by two inductance [Ls1], [Lr1], two electric capacity [Cb1], [Cs1] and three diodes [Ds11], [Ds21], [Dr1] forms, one of them conducting absorption inductor [Ls1] is connected between power source bus and the brachium pontis, the switching tube of this brachium pontis [S1] with by storage capacitor [Cb1], the series circuit that first diode [Ds11] and shutoff absorb electric capacity [Cs1] formation is in parallel, supreme at storage capacitor [Cb1] with the tie point of first diode [Ds11], insert the circuit that another inductance [Lr1] and second diode [Dr1] are in series between the mid point of following brachium pontis, absorb the tie point of electric capacity [Cs1] to inserting the 3rd diode [Ds12], above-mentioned three diodes [Ds11] between the power source bus at first diode [Ds11] and shutoff, [Dr1], the polarity of [Ds12] is consistent.
2. press the passive soft on-off circuit of the described inverter bridge of claim 1, it is characterized in that two inductance [Lr1], [Lr2] in the energy feedback circuit use DC power supply [Vdc1], [Vdc2] to replace respectively, between the contact of DC power supply [Vdc1] and diode [Dr2], insert inductance [Lr] at the mid point of the upper and lower brachium pontis of inverter bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02215737 CN2541995Y (en) | 2002-02-07 | 2002-02-07 | Passive soft switching circuit of inverter bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02215737 CN2541995Y (en) | 2002-02-07 | 2002-02-07 | Passive soft switching circuit of inverter bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2541995Y true CN2541995Y (en) | 2003-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02215737 Expired - Lifetime CN2541995Y (en) | 2002-02-07 | 2002-02-07 | Passive soft switching circuit of inverter bridge |
Country Status (1)
| Country | Link |
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| CN (1) | CN2541995Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332456A (en) * | 2017-08-01 | 2017-11-07 | 东北大学 | A kind of three-phase passive flexible switch inverter circuit |
| CN107947612A (en) * | 2017-12-25 | 2018-04-20 | 成都麦隆电气有限公司 | A kind of lossless soft breaking circuit of tri- level of NPC |
-
2002
- 2002-02-07 CN CN 02215737 patent/CN2541995Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332456A (en) * | 2017-08-01 | 2017-11-07 | 东北大学 | A kind of three-phase passive flexible switch inverter circuit |
| CN107332456B (en) * | 2017-08-01 | 2019-04-05 | 东北大学 | A kind of three-phase passive flexible switch inverter circuit |
| CN107947612A (en) * | 2017-12-25 | 2018-04-20 | 成都麦隆电气有限公司 | A kind of lossless soft breaking circuit of tri- level of NPC |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |