CN101895205B - Transducer - Google Patents
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- CN101895205B CN101895205B CN201010240750A CN201010240750A CN101895205B CN 101895205 B CN101895205 B CN 101895205B CN 201010240750 A CN201010240750 A CN 201010240750A CN 201010240750 A CN201010240750 A CN 201010240750A CN 101895205 B CN101895205 B CN 101895205B
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Abstract
The invention relates to a transducer. In the transducer, a rectifier is connected with a positive pole, a negative pole and an intermediate point of an inverter respectively; an upper half bridge supporting capacitor is connected between the positive pole and the intermediate point of the inverter, and a lower half bridge supporting capacitor is connected between the negative pole and the intermediate point of the inverter; a pre-charge circuit comprises a transformer, wherein a primary side of the transformer is connected with a charging source; a first end point of a secondary side of the transformer is connected with the public end of a first diode and a third diode, a second end point of the secondary side is connected with the public end of a second diode and a fourth diode; the first diode, the second diode, the third diode and the fourth diode are connected in series in turn; the cathode of the first diode and the cathode of the second diode are connected, and the public end of the first diode and the second diode is connected with the positive pole of the inverter; the anode of the third diode and the anode of the fourth diode are connected, and the public end of the third diode and the fourth diode is connected with the negative pole of the inverter; and the third end of the secondary side of the transformer is connected with the intermediate point of the inverter. The transducer realizes automatic voltage sharing in a charging process, and protects the upper and lower half bridge supporting capacitors from over-voltage damage.
Description
Technical field
The present invention relates to the frequency converter field, more particularly, relate to a kind of three level mesohigh frequency converters of automatically equalizing voltage type.
Background technology
Three-level converter is because output voltage is high, power output is big, harmonic content is low, has obtained extensive use in mesohigh high-power frequency conversion field.The frequency converter DC link is parallel with a plurality of support electric capacity, is used to keep the stable of direct voltage.After frequency converter inserted electrical network, line voltage can directly be added on the support electric capacity, can not suddenly change owing to support the voltage of electric capacity, can cause damage to supporting electric capacity supporting very big impulse current of generation on the electric capacity.This just need charge to supporting electric capacity through pre-charge circuit, with the infringement of avoiding impulse current to cause.
Referring to Fig. 1; A kind of three-level converter is shown, and this frequency converter comprises main circuit and pre-charge circuit, and main circuit comprises the rectifier U1 that connects grid side, the inverter U2 that connects load-side; The positive pole of rectifier U1 and inverter U2, negative pole, intermediate point (M point) are connected respectively; Wherein, connect between the positive pole of inverter U2 and the M point and go up half-bridge support capacitor C 1, connecting down between the negative pole of inverter U2 and the M point, half-bridge supports capacitor C 2.
Pre-charge circuit comprises transformer T1, and the former limit of transformer TI connects charge power supply through K switch 1, and secondary one end is connected the common port of diode D1 and diode D3, and the other end is connected the common port of diode D2 and diode D4; Diode D1, diode D2, diode D3 and diode D4 connect successively, and wherein, diode D1 is connected with diode D2 negative electrode, and its common port is connected the inverter positive pole through resistance R 1.
The last half-bridge of this frequency converter supports capacitor C 1 and supports capacitor C 2 owing to reasons such as material and production technologies with following half-bridge; Supporting capacitance can not be identical; Always there is certain deviation, causes going up in the charging process Voltage unbalance that half-bridge supports capacitor C 1 and following half-bridge support capacitor C 2.
Referring to Fig. 2; Last half-bridge supports capacitor C 1 and reaches at 10% o'clock with the support variation in capacitance value that following half-bridge supports capacitor C 2; The waveform of the charging voltage of two support electric capacity (go up half-bridge and support capacitor C 1 positively biased 10%, following half-bridge supports capacitor C 2 negative bias 10%), it is obviously uneven with the voltage waveform that following half-bridge supports capacitor C 2 to support capacitor C 1 by the visible upward half-bridge of Fig. 2; The voltage ratio normal value that following half-bridge support capacitor C 2 is born exceeds a lot, is easy to cause half-bridge to support capacitor C 2 and damages because of overvoltage.
Summary of the invention
For solving the problems of the technologies described above, the present invention provides a kind of frequency converter, and this frequency converter is realized the automatically equalizing voltage in the charging process, and the infringement that electric capacity does not receive overvoltage is supported in protection half-bridge up and down.
The present invention relates to a kind of frequency converter; Comprise main circuit and pre-charge circuit; Main circuit comprises rectifier that connects grid side and the inverter that is connected load-side, and positive pole, negative pole and the intermediate point of rectifier and inverter are connected respectively, wherein; Connect between the positive pole of inverter and the intermediate point and go up half-bridge support electric capacity, connecting down between negative pole and the intermediate point, half-bridge supports electric capacity;
Pre-charge circuit comprises transformer, and the former limit of transformer connects charge power supply, and secondary first end points is connected the common port of first diode and the 3rd diode, and secondary second end is connected the common port of second diode and the 4th diode; First diode, second diode, the 3rd diode and the 4th diode are connected successively; Wherein, First diode is connected with the negative electrode of second diode, and its common port connects the positive pole of inverter, and the 3rd diode is connected with the anode of the 4th diode; Its common port connects the negative pole of inverter, and the 3rd end points of transformer secondary connects the intermediate point of inverter.
Preferably, the former limit of said transformer connects charge power supply through switch.
Preferably, the common port of first diode and second diode is connected the positive pole of inverter through first resistance.
Preferably, the common port of the 3rd diode and the 4th diode is connected the negative pole of inverter through second resistance.
Preferably, said charge power supply is a three-phase input power supply, can mate multiple voltage such as 380V, 460V and 690V.
Preferably, said transformer is the three-phase voltage increasing transformer.
The present invention solves half-bridge and supports electric capacity and the unbalanced problem of following half-bridge support electric capacity charging voltage, and half-bridge supports electric capacity and supports the automatically equalizing voltage in the electric capacity charging process with following half-bridge in the realization, and half-bridge supports the infringement that electric capacity does not receive overvoltage about the protection.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is existing three-level converter circuit diagram;
Fig. 2 is the existing waveform that half-bridge supports the electric capacity and the charging voltage of following half-bridge support electric capacity of going up;
Fig. 3 is converter circuit figure of the present invention;
Fig. 4 supports the waveform of the electric capacity and the charging voltage of following half-bridge support electric capacity for half-bridge in the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Referring to Fig. 3; A kind of frequency converter of the present invention is shown, comprises main circuit and pre-charge circuit, main circuit comprises rectifier U1 that connects grid side and the inverter U2 that is connected load-side; Positive pole, negative pole and the intermediate point of rectifier U1 and inverter U2 are connected respectively; Wherein, connect between the positive pole of inverter U1 and the intermediate point (M point) and go up half-bridge support capacitor C 1, connecting down between negative pole and the intermediate point (M point), half-bridge supports capacitor C 2;
Pre-charge circuit comprises transformer T2, and the former limit of transformer T2 connects charge power supply, and secondary first end points is connected the common port of diode D1 and diode D3, and secondary second end is connected the common port of diode D2 and diode D4; Diode D1, diode D2, diode D3 and diode D4 connect successively; Wherein, Diode D1 is connected with the negative electrode of diode D2, and its common port connects the positive pole of inverter U2, and diode D3 is connected with the anode of diode D4; Its common port connects the negative pole of inverter U2, and the 3rd end points of transformer T2 secondary connects the intermediate point (M point) of inverter U2.
The former limit of transformer T2 connects charge power supply through K switch 2.The common port of diode D1 and diode D2 is connected the positive pole of inverter U2 through resistance R 1, and the common port of diode D3 and diode D4 is connected the negative pole of inverter U2 through resistance R 2.
Said charge power supply is a three-phase input power supply, can mate multiple voltage such as 380V, 460V and 690V.Transformer T1 is the three-phase voltage increasing transformer, has a plurality of taps.
The pre-charge circuit that the present invention relates to frequency converter is before main circuit powers on; The close switch K2 of elder generation; Last half-bridge is supported capacitor C 1 supports capacitor C 2 with following half-bridge and charge, treat that half-bridge supports capacitor C 1 and following half-bridge support capacitor C 2 and reaches the assigned voltage value at the appointed time after, closed again rectifier U1 grid side power switch; While cut-off switch K2, charging process is accomplished.
Suppose to go up half-bridge voltage and take the lead in reaching the input voltage peak value, then diode D1 and diode D2 end, and stop last half-bridge is supported capacitor C 1 charging; And half-bridge supports capacitor C 2 continuation through diode D3 and diode D4 charging down, until also reaching the input voltage peak value.
In like manner, if half-bridge voltage takes the lead in reaching the input voltage peak value down, then diode D3 and diode D4 pipe ends, and stops half-bridge support capacitor C 2 chargings down; Support capacitor C 1 continuation through diode D1 and diode D2 charging and go up half-bridge, until also reaching the input voltage peak value.
When last half-bridge supports the support variation in capacitance value 10% of capacitor C 1 and following half-bridge support capacitor C 2 (go up half-bridge and support capacitor C 1 positively biased 10%, following half-bridge supports capacitor C 2 negative bias 10%), the charging voltage waveform is as shown in Figure 4.Can know that the voltage of going up half-bridge support capacitor C 1 and following half-bridge support capacitor C 2 is basic identical; Half-bridge supports capacitor C 1 and supports the unbalanced problem of capacitor C 2 charging voltages with following half-bridge in the solution; Half-bridge supports capacitor C 1 and supports the automatically equalizing voltage in capacitor C 2 charging processes with following half-bridge in the realization, and the infringement that electric capacity does not receive overvoltage is supported in protection half-bridge up and down.
The rectifier U1 that the present invention relates to frequency converter can adopt diode rectification, also can adopt controlled rectification certainly.Inverter U2 can be a substance, also can be multiple parallel connection or cascade.
The above only is an embodiment of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (6)
1. frequency converter; Comprise main circuit and pre-charge circuit; Main circuit comprises the rectifier that connects grid side, the inverter that connects load-side, and positive pole, negative pole and the intermediate point of rectifier and inverter are connected respectively, wherein; Connect between the positive pole of inverter and the intermediate point and go up half-bridge support electric capacity, connecting down between negative pole and the intermediate point, half-bridge supports electric capacity;
Pre-charge circuit comprises transformer; The former limit of transformer connects charge power supply; Secondary first end points connects the anode of first diode; The anode of first diode connects the negative electrode of the 3rd diode, and secondary second end points connects the anode of second diode, and the anode of second diode connects the negative electrode of the 4th diode; Wherein, first diode and the negative electrode of second diode all are connected the positive pole of inverter, and the 3rd diode and the anode of the 4th diode all are connected the negative pole of inverter, it is characterized in that:
The 3rd end points of transformer secondary connects the intermediate point of inverter.
2. frequency converter as claimed in claim 1 is characterized in that, the former limit of said transformer connects charge power supply through switch.
3. frequency converter as claimed in claim 1 is characterized in that, the common port of first diode and second diode is connected the positive pole of inverter through first resistance.
4. frequency converter as claimed in claim 1 is characterized in that, the common port of the 3rd diode and the 4th diode is connected the negative pole of inverter through second resistance.
5. like each described frequency converter of claim 1-4, it is characterized in that said charge power supply is a three-phase input power supply, coupling 380V, 460V and 690V voltage.
6. like each described frequency converter of claim 1-4, it is characterized in that said transformer is the three-phase voltage increasing transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010240750A CN101895205B (en) | 2010-07-27 | 2010-07-27 | Transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010240750A CN101895205B (en) | 2010-07-27 | 2010-07-27 | Transducer |
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| Publication Number | Publication Date |
|---|---|
| CN101895205A CN101895205A (en) | 2010-11-24 |
| CN101895205B true CN101895205B (en) | 2012-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010240750A Active CN101895205B (en) | 2010-07-27 | 2010-07-27 | Transducer |
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| CN (1) | CN101895205B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9748860B2 (en) | 2013-05-20 | 2017-08-29 | Ge Energy Power Conversion Technology Ltd | Input filter pre-charge fed by a medium-voltage grid supply |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820771B (en) * | 2012-08-10 | 2015-10-21 | 深圳市禾望电气股份有限公司 | A kind of converter equipment soft starting device and soft-start method |
| US10411585B2 (en) * | 2014-06-08 | 2019-09-10 | Kabushiki Kaisha Yaskawa Denki | Inverter system, inverter apparatus, and method of controlling inverter system |
| CN106877709A (en) * | 2017-03-15 | 2017-06-20 | 中冶华天南京电气工程技术有限公司 | One kind is used for high voltage converter pre-charging device and method |
Citations (6)
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| US5892674A (en) * | 1996-02-16 | 1999-04-06 | Hitachi, Ltd. | Method and apparatus for power converting AC into DC or DC into AC by converter having common phase connection |
| CN1862937A (en) * | 2006-02-23 | 2006-11-15 | 国电南京自动化股份有限公司 | Three-level integrated medium, high voltage frequency changer |
| CN2847680Y (en) * | 2005-12-16 | 2006-12-13 | 山东新风光电子科技发展有限公司 | Multiple level circuit device |
| CN100459396C (en) * | 2006-12-13 | 2009-02-04 | 上海新时达电气股份有限公司 | Precharging circuit for converter |
| CN101521472A (en) * | 2009-02-13 | 2009-09-02 | 上海新时达电气股份有限公司 | Precharge control circuit for transducer |
| CN201523337U (en) * | 2009-10-30 | 2010-07-07 | 湖南中科电气股份有限公司 | High-voltage high-power frequency converter by using low-voltage power to pre-charge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7839215B2 (en) * | 2008-06-16 | 2010-11-23 | Rgb Systems, Inc. | Method and apparatus for power converter for class D audio power amplifiers |
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2010
- 2010-07-27 CN CN201010240750A patent/CN101895205B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5892674A (en) * | 1996-02-16 | 1999-04-06 | Hitachi, Ltd. | Method and apparatus for power converting AC into DC or DC into AC by converter having common phase connection |
| CN2847680Y (en) * | 2005-12-16 | 2006-12-13 | 山东新风光电子科技发展有限公司 | Multiple level circuit device |
| CN1862937A (en) * | 2006-02-23 | 2006-11-15 | 国电南京自动化股份有限公司 | Three-level integrated medium, high voltage frequency changer |
| CN100459396C (en) * | 2006-12-13 | 2009-02-04 | 上海新时达电气股份有限公司 | Precharging circuit for converter |
| CN101521472A (en) * | 2009-02-13 | 2009-09-02 | 上海新时达电气股份有限公司 | Precharge control circuit for transducer |
| CN201523337U (en) * | 2009-10-30 | 2010-07-07 | 湖南中科电气股份有限公司 | High-voltage high-power frequency converter by using low-voltage power to pre-charge |
Non-Patent Citations (1)
| Title |
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| 何人望，黄炜.高压IGCT缓冲电路的仿真与实验研究.《电力电子技术》.2007,第41卷(第7期),83-85. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9748860B2 (en) | 2013-05-20 | 2017-08-29 | Ge Energy Power Conversion Technology Ltd | Input filter pre-charge fed by a medium-voltage grid supply |
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| CN101895205A (en) | 2010-11-24 |
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Address after: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road No. 169 Patentee after: ZHUZHOU CRRC TIMES ELECTRIC Co.,Ltd. Address before: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road Patentee before: ZHUZH CSR TIMES ELECTRIC Co.,Ltd. |
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