CN100403644C - Power converter - Google Patents
Power converter Download PDFInfo
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- CN100403644C CN100403644C CNB2004100821118A CN200410082111A CN100403644C CN 100403644 C CN100403644 C CN 100403644C CN B2004100821118 A CNB2004100821118 A CN B2004100821118A CN 200410082111 A CN200410082111 A CN 200410082111A CN 100403644 C CN100403644 C CN 100403644C
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- switch element
- lead
- power supply
- smmothing capacitor
- group
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Abstract
To simplify the structure of a power converting device, to make it cost effective, and to miniaturize it, by making a DC smoothing capacitor have both its primary function and the function of suppressing a surge voltage that is generated when a switching element is turned off, in a power converting device that eliminates a phase capacitor system snubber and an individual system snubber. In this power converting device, the output terminals of a piece of capacitor or DC smoothing capacitors Fc1, arranged in collective concentration and the positive and negative poles P, N of the DC power input of each phase converting circuit are connected by each independent wiring so that the capacitor is made to concurrently have the smoothing function of a DC voltage and the function of suppressing a surge voltage that is caused to occur at switching.
Description
Technical field
The present invention relates to a kind of for example power inverter of two level PWM converters.
Background technology
Fig. 5 shows a kind of two level PWM three-phase inverters according to the correlation technique of using the crowbar switch element.This converter comprises DC (direct current) power supply Vd, DC smmothing capacitor Fca, crowbar switch element Qu, Qv, Qw, Qx, Qy and Qz, motor load M, and capacitor (being hereinafter referred to as the phase capacitor) Su, Sv and the surge voltage of Sw to suppress when switch element disconnects, to produce.
According to this correlation technique, phase capacitor Su suppresses U and goes up the surge voltage Vp that produces mutually.Suppress effect in order to improve surge voltage, phase capacitor Su be connected usually switch element Qu and Qx near.Be used for V and W mutually phase capacitor Sv and the configuration of Sw be similar.Another kind of technology is arranged, and it has disposed discharge or the clamp buffer that is used for each switch element respectively.Yet this technology increases the number of parts, and makes the structure complicated of converter.
Fig. 6 shows the example of wiring of the converter of the Fig. 5 that uses the switch element module.The wiring of Fig. 6 relates to wiring inductance L1, L2 and L3.Fig. 7 shows the U phase according to the converter of the another kind of correlation technique of using the paralleling switch element.The phase capacitor Fcu that suppresses surge voltage Vp is used for switch element by collective's configuration.The U of Fig. 7 part mutually relates to wiring inductance L4, L5 and L6.
The withstand voltage height of recent thyristor by big electric current, uses the element protection circuit of simplifying, and the utilization limit Design is to reduce the size and the cost of the power inverter that uses switch element.
The prior art of Fig. 5 is used and is respectively applied for U, V and W phase capacitor Su, Sv and Sw mutually, with the surge voltage Vp that suppresses to produce when switch element disconnects.The inductance of these phase capacitors is very low, and electric capacity is that about tens μ F are to hundreds of μ F.These capacitors and DC smmothing capacitor Fca have increased the size and the cost of converter.
Among Fig. 6, this correlation technique is connected tie point P, P1, P2 and P3 with lead, and with lead tie point N, N1, N2 and N3 is connected, and to the lead of element, and simplifies wiring from power supply Vd to switch element with the shortizationest element.When using bus to be used to connect up, this configuration is frequently used.This configuration increases wiring inductance with distance apart from DC smmothing capacitor Fca with being directly proportional, therefore increases the surge voltage Vp of generation when switch element disconnects with wiring inductance with being directly proportional.Among Fig. 6, Lca is an internal inductance.
The surge voltage Vp of each phase is expressed as follows:
U phase: Vpu=(Lca+L1) di/dt
V phase: Vpv=(Lca+L1+L2) di/dt
W phase: Vpw=(Lca+L1+L2+L3) di/dt ... (1)
The pass of these surge voltages is Vpu＜Vpv＜Vpw.That is, W phase surge voltage maximum is because it relates to maximum wiring inductance.
Among Fig. 7, switch element is divided into group of switching elements a, b and the c of three parallel connections.Group a comprises switch element Qua and Qxa, and group b comprises Qub and Qxb, and group c comprises Quc and Qxc.Above switch element Qua, Qub and Quc, or following switch element Qxa, Qxb and Qxc carry out switch simultaneously.For the surge voltage Vp that suppresses to produce when switch element disconnects, Fcu is configured to the phase capacitor.As the correlation technique of Fig. 6, capacitor Fcu and the wiring distance between the switch element of Fig. 7 are different each other.Along with the distance increase of distance capacitor Fcu, wiring inductance increases, and surge voltage Vp increases with wiring inductance with being directly proportional.
The surge voltage Vp of group of switching elements a, b and c is as follows:
Group a:Vpa=(Lca+L4) di/dt
Group b:Vpb=(Lca+L4+L5) di/dt
Group c:Vpc=(Lca+L4+L5+L6) di/dt ... (2)
The pass of these surge voltages is Vpa＜Vpb＜Vpc.Be the surge voltage Vpc maximum of group of switching elements c, because it relates to maximum wiring inductance.Among Fig. 7, do not have the phase capacitor near the switch element, so occur more significantly among diversity ratio Fig. 6 of surge voltage.
As above mention, the correlation technique of Fig. 6 produces the different surge voltage Vp that depend on the wiring distance from DC smmothing capacitor Fca to switch element.Switch element is farthest especially born the heaviest responsibility with capacitor mutually, because their receive maximum voltage.When each parts of design transformation device, maximum surge voltage Vp is used as withstand voltage.This causes the size of converter and the increase of cost.The correlation technique of Fig. 7 also is like this.
Summary of the invention
A target of the present invention provides a kind of power inverter that can reduce its size and cost.
In order to reach this target, first aspect of the present invention provides a kind of DC smmothing capacitor with lead-out terminal and the power inverter of distributing to each translation circuit mutually respectively that comprises independent or integrated type, and each translation circuit has switch element and is connected to the positive and negative electrode of DC power supply.The lead-out terminal of DC smmothing capacitor is connected to the positive and negative electrode of translation circuit respectively by lead separately, make the DC smmothing capacitor carry out smoothly, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element the dc voltage that provides by the DC power supply.
Second aspect of the present invention provides a kind of DC smmothing capacitor with lead-out terminal and the power inverter of distributing to each translation circuit mutually respectively that comprises independent or integrated type, and each translation circuit has switch element and is connected to the positive and negative electrode of DC power supply.The lead-out terminal of the DC smmothing capacitor lead by separately respectively is connected in the translation circuit near the translation circuit of DC power supply with away from the positive and negative electrode of the translation circuit of DC power supply, make the DC smmothing capacitor carry out smoothly, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element the dc voltage that provides by the DC power supply.
The 3rd aspect of the present invention provides a kind of DC smmothing capacitor with lead-out terminal that comprises independent or integrated type and is divided into the power inverter of the paralleling switch element of first group and second group.First group of switch element has the positive electrode that is connected to the DC power supply, and second group of switch element has the negative electrode that is connected to the DC power supply.The lead-out terminal of DC smmothing capacitor is connected to the positive electrode of first group of switch element and the negative electrode of second group of switch element by lead separately, make the DC smmothing capacitor carry out smoothly, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element the dc voltage that provides by the DC power supply.
The 4th aspect of the present invention provides a kind of DC smmothing capacitor with lead-out terminal that comprises independent or integrated type and is divided into the power inverter of the paralleling switch element of first group and second group.First group of switch element has the positive electrode that is connected to the DC power supply, and second group of switch element has the negative electrode that is connected to the DC power supply.The lead-out terminal of DC smmothing capacitor passes through lead separately, be connected in first group of switch element near the DC power supply and away from the positive electrode of two switch elements of DC power supply and the second group of switch element near the DC power supply with away from the negative electrode of two switch elements of DC power supply, make the DC smmothing capacitor carry out smoothly, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element the dc voltage that provides by the DC power supply.
According to above-mentioned any one aspect, the DC smmothing capacitor plays a role, dc voltage is carried out level and smooth and the surge voltage of inhibition when switch element disconnects, to simplify the size and the cost of power inverter and reduction power inverter.
The accompanying drawing summary
Fig. 1 is the circuit diagram that illustrates according to the power inverter of the first embodiment of the present invention;
Fig. 2 is the circuit diagram that power inverter according to a second embodiment of the present invention is shown;
Fig. 3 is the circuit diagram that the power inverter of a third embodiment in accordance with the invention is shown;
Fig. 4 is the circuit diagram that the power inverter of a fourth embodiment in accordance with the invention is shown;
Fig. 5 is the circuit diagram that illustrates according to a kind of power inverter of correlation technique;
Fig. 6 is the circuit diagram that the power inverter of Fig. 5 is shown;
Fig. 7 is the circuit diagram that illustrates according to the power inverter of another kind of correlation technique.
Embodiment
Embodiments of the invention will be referenced accompanying drawing and describe.Fig. 1 shows the power inverter according to the first embodiment of the present invention.Among Fig. 1, the internal inductance of DC smmothing capacitor is left in the basket.The converter of first embodiment is collective's three-phase inverter.This converter comprises switch element Qu, Qv, Qw, Qx, Qy and Qz, has the DC smmothing capacitor Fc1 of lead-out terminal C1 to C6, DC power supply Vd, and converter output U, V and W.
In the positive side (P) of DC smmothing capacitor Fc1, the terminal C1 of capacitor Fc1, terminal C2 and the terminal C3 lead by separately, the end of terminal CT, switch element Qv that is connected to switch element Qu respectively is in the terminal CT of CT and switch element Qw.At the minus side (N) of DC smmothing capacitor Fc1, the terminal C4 of capacitor Fc1, terminal C5 and the terminal C6 lead by separately is connected to the terminal ET of terminal ET, switch element Qy of switch element Qx and the terminal ET of switch element Qz respectively.These leads have essentially identical length.
By this way, power inverter according to first embodiment is connected to phase U, V and W with DC smmothing capacitor Fc1 in the above described manner, with wiring inductance L11, L22 and the L33 of balanced this three-phase basically, thereby the surge voltage Vp that produces on balanced this three-phase is as follows:
U phase: Vpu=(Lca+L11) di/dt
V phase: Vpv=(Lca+L22) di/dt
W phase: Vpw=(Lca+L33) di/dt ... (3)
According to first embodiment, DC smmothing capacitor Fc1 plays a role, dc voltage carried out level and smooth and to suppress surge voltage Vp.This causes having eliminated the phase capacitor, and has reduced the cost of power inverter.
Fig. 2 shows power inverter according to a second embodiment of the present invention.This converter comprises switch element Qu, Qv, Qw, Qx, Qy and Qz, has the DC smmothing capacitor Fc2 of lead-out terminal C1 to C4, DC power supply Vd, and converter output U, V and W.In the positive side (P) of DC smmothing capacitor Fc2, the terminal C1 of capacitor Fc2 and terminal C2 are connected to the terminal CT of switch element Qu and the terminal CT of switch element Qw respectively by lead separately.At the minus side (N) of DC smmothing capacitor Fc2, the terminal C3 of capacitor Fc2 and terminal C4 pass through lead separately, are connected to the terminal ET of switch element Qx and the terminal ET of switch element Qz respectively.These leads have essentially identical length.
By this way, in the above described manner DC smmothing capacitor Fc2 is connected to phase U and W according to the power inverter of second embodiment, with the wiring inductance L44 and the L55 of balanced this two-phase basically, thereby balanced phase U goes up the surge voltage Vp that produces with W mutually, and is as follows:
U phase: Vpu=(Lca+L44) di/dt
W phase: Vpw=(Lca+L55) di/dt ... (4)
The surge voltage Vp that V goes up is mutually shared mutually with W by U and suppresses, thus the surge voltage Vp that V goes up mutually than U and W go up mutually all big slightly.Yet second embodiment can reduce the number of lead, makes its lead number less than first embodiment, thereby compares more light weight of first embodiment.
Fig. 3 shows the power inverter of a third embodiment in accordance with the invention.The 3rd embodiment uses switch element in parallel.Fig. 3 only shows a phase, and promptly the U in U, V and the W three-phase mutually.The circuit structure of V and the W phase all structure with the U phase is identical.
The U phase structure of Fig. 3 comprises switch element Qua, Qub, Quc, Qxa, Qxb and Qxc.Above switch element Qua, Qub and Quc be connected with Qxc is parallel with following switch element Qxa, Qxb, with the switch element that forms three parallel connections to a, b and c, formation U phase inversion circuit.The structure of Fig. 3 also comprises DC smmothing capacitor Fc3 and the U phasing commutator output U with lead-out terminal C1 to C6.In the positive side (P) of DC smmothing capacitor Fc3, the terminal C1 of capacitor Fc3, terminal C2 and the terminal C3 lead by separately is connected to the terminal CT of terminal CT, switch element Qub of switch element Qua and the terminal CT of switch element Quc respectively.At the minus side (N) of DC smmothing capacitor Fc3, the terminal C4 of capacitor Fc3, terminal C5 and the terminal C6 lead by separately is connected to the terminal ET of terminal ET, switch element Qxb of switch element Qxa and the terminal ET of switch element Qxc respectively.These leads have essentially identical length.
By this way, power inverter according to the 3rd embodiment is connected to DC smmothing capacitor Fc3 top and following switch element in parallel in the above described manner, with balanced three switch elements basically to wiring inductance L66, L77 and the L88 of a, b and c, thereby balanced three surge voltage Vp to a, b and the last generation of c are as follows:
a：Vpa＝(Lca+L66)di/dt
b：Vpb＝(Lca+L77)di/dt
c：Vpc＝(Lca+L88)di/dt ...(5)
According to the 3rd embodiment, DC smmothing capacitor Fc3 plays a role, dc voltage carried out level and smooth and to suppress surge voltage Vp.This causes having eliminated the phase capacitor, and has reduced the cost of power inverter.
Fig. 4 shows the power inverter of a fourth embodiment in accordance with the invention.The 4th embodiment uses switch element in parallel.Fig. 4 only shows a phase, and promptly the U in U, V and the W three-phase mutually.The circuit structure of V and the W phase all structure with the U phase is identical.The U phase structure of Fig. 4 comprises switch element Qua, Qub, Quc, Qxa, Qxb and Qxc.Above switch element Qua, Qub and Quc be connected with Qxc is parallel with following switch element Qxa, Qxb, with the switch element that forms three parallel connections to a, b and c, formation U phase inversion circuit.The structure of Fig. 4 also comprises DC smmothing capacitor Fc4 and the U phasing commutator output U with lead-out terminal C1 to C4.In the positive side (P) of DC smmothing capacitor Fc4, the terminal C1 of capacitor Fc4 and terminal C2 pass through lead separately, are connected to the terminal CT of switch element Qua and the terminal CT of switch element Quc respectively.At the minus side (N) of DC smmothing capacitor Fc4, the terminal C3 of capacitor Fc4 and terminal C4 pass through lead separately, are connected to the terminal ET of switch element Qxa and the terminal ET of switch element Qxc respectively.These leads have essentially identical length.
By this way, will be connected to terminal C2 and the C4 of DC smmothing capacitor Fc4 respectively according to the power inverter of the 4th embodiment near the terminal of the top and following switch element Qua of DC power supply and Qxa, and will be connected to terminal C1 and the C3 of DC smmothing capacitor Fc4 respectively away from the terminal of the top and following switch element Quc of DC power supply and Qxc, with equalizer switch element basically to wiring inductance L99 and the Lnn of a and c, thereby balanced two surge voltage Vp to a and the last generation of c are as follows:
a：Vpa＝(Lca+L99)di/dt
c：Vpc＝(Lca+Lnn)di/dt ...(6)
According to the 4th embodiment, the surge voltage Vp on switch element Qub and the Qxb is by switch element Qua and Qxa and switch element Quc and Qxc inhibition.Voltage Vp on switch element Qub and the Qxb is more slightly larger than the voltage Vp on switch element Qua and Qxa and switch element Quc and the Qxc.Yet the 4th embodiment can reduce the number of lead, makes its lead number less than the 3rd embodiment, thereby compares more light weight of the 3rd embodiment.
Claims (4)
1. power inverter comprises:
DC smmothing capacitor with lead-out terminal; And
Distribute to heterogeneous translation circuit respectively, the positive and negative electrode that each in these translation circuits all has switch element and is connected to the DC power supply,
Wherein, the lead-out terminal of DC smmothing capacitor is connected to the positive and negative electrode of each translation circuit respectively by lead separately, make the DC smmothing capacitor carry out smoothly to the dc voltage that provides by the DC power supply, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element, wherein, the length of described lead is identical.
2. power inverter comprises:
DC smmothing capacitor with lead-out terminal; And
Distribute to the translation circuit of each phase respectively, the positive and negative electrode that each in these translation circuits has switch element and is connected to the DC power supply,
Wherein, the lead of the lead-out terminal of DC smmothing capacitor by separately is connected to respectively near the translation circuit of DC power supply with away from the positive and negative electrode of the translation circuit of DC power supply, make the DC smmothing capacitor carry out smoothly to the dc voltage that provides by the DC power supply, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element, wherein, the length of described lead is identical.
3. power inverter comprises:
Be DC smmothing capacitor each configuration in heterogeneous, that have lead-out terminal; And
In parallel first group and second group of switch element, first group of switch element has the positive electrode that is connected to the DC power supply, and second group of switch element have the negative electrode that is connected to the DC power supply,
Wherein, the lead-out terminal of DC smmothing capacitor is connected to the positive electrode of first group of switch element and the negative electrode of second group of switch element respectively by lead separately, make the DC smmothing capacitor carry out smoothly to the dc voltage that provides by the DC power supply, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element, wherein, the length of described lead is identical.
4. power inverter comprises:
Be DC smmothing capacitor each configuration in heterogeneous, that have output port; And
In parallel first group and second group of switch element, first group of switch element has the positive electrode that is connected to the DC power supply, and second group of switch element have the negative electrode that is connected to the DC power supply,
Wherein, the lead of the lead-out terminal of DC smmothing capacitor by separately be connected to respectively in first group of switch element near the DC power supply and away from the positive electrode of two switch elements of DC power supply and the second group of switch element near the DC power supply with away from the negative electrode of two switch elements of DC power supply, make the DC smmothing capacitor carry out smoothly to the dc voltage that provides by the DC power supply, and be suppressed at the surge voltage that produces during the switching manipulation of described switch element, wherein, the length of described lead is identical.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003416642A JP2005176576A (en) | 2003-12-15 | 2003-12-15 | Power converting device |
| JP2003416642 | 2003-12-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1630176A CN1630176A (en) | 2005-06-22 |
| CN100403644C true CN100403644C (en) | 2008-07-16 |
Family
ID=34735780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100821118A Expired - Fee Related CN100403644C (en) | 2003-12-15 | 2004-12-15 | Power converter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005176576A (en) |
| CN (1) | CN100403644C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8462530B2 (en) | 2006-12-21 | 2013-06-11 | Siemens Aktiengesellschaft | Converter with short-circuit current limiting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038009C (en) * | 1993-01-28 | 1998-04-08 | 富士电机株式会社 | Inverter device |
| JP2000125543A (en) * | 1998-10-15 | 2000-04-28 | Nikki Denso Kk | Surge voltage-suppressing means and semiconductor power conversion device |
| JP2001238458A (en) * | 2000-02-24 | 2001-08-31 | Toshiba Corp | Power converter |
| JP2002153078A (en) * | 2000-11-09 | 2002-05-24 | Hitachi Ltd | 3-level power conversion device |
| CN1108657C (en) * | 1997-11-25 | 2003-05-14 | 株式会社日立制作所 | Power inverter device |
| JP2003219655A (en) * | 2002-01-21 | 2003-07-31 | Hitachi Ltd | Power converter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH077958A (en) * | 1993-06-15 | 1995-01-10 | Hitachi Ltd | Power converter |
| JP3486828B2 (en) * | 1995-10-19 | 2004-01-13 | 富士電機ホールディングス株式会社 | Power converter |
| JPH1127959A (en) * | 1997-07-08 | 1999-01-29 | Toshiba Fa Syst Eng Kk | Inverter |
| JP2002320391A (en) * | 2001-04-19 | 2002-10-31 | Fuji Electric Co Ltd | Conductor structure of large capacity power converter |
| JP2003299366A (en) * | 2002-04-03 | 2003-10-17 | Denso Corp | Power converter |
-
2003
- 2003-12-15 JP JP2003416642A patent/JP2005176576A/en active Pending
-
2004
- 2004-12-15 CN CNB2004100821118A patent/CN100403644C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038009C (en) * | 1993-01-28 | 1998-04-08 | 富士电机株式会社 | Inverter device |
| CN1108657C (en) * | 1997-11-25 | 2003-05-14 | 株式会社日立制作所 | Power inverter device |
| JP2000125543A (en) * | 1998-10-15 | 2000-04-28 | Nikki Denso Kk | Surge voltage-suppressing means and semiconductor power conversion device |
| JP2001238458A (en) * | 2000-02-24 | 2001-08-31 | Toshiba Corp | Power converter |
| JP2002153078A (en) * | 2000-11-09 | 2002-05-24 | Hitachi Ltd | 3-level power conversion device |
| JP2003219655A (en) * | 2002-01-21 | 2003-07-31 | Hitachi Ltd | Power converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1630176A (en) | 2005-06-22 |
| JP2005176576A (en) | 2005-06-30 |
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