CN1050245C - Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter - Google Patents
Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter Download PDFInfo
- Publication number
- CN1050245C CN1050245C CN96117751A CN96117751A CN1050245C CN 1050245 C CN1050245 C CN 1050245C CN 96117751 A CN96117751 A CN 96117751A CN 96117751 A CN96117751 A CN 96117751A CN 1050245 C CN1050245 C CN 1050245C
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- circuit
- resistance
- power tube
- converter
- lower power
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- Inverter Devices (AREA)
Abstract
The present invention relates to an inverter which uses a preprocessing circuit composed of an RC time delay circuit and a resistance voltage divider. The circuit outputs an element for driving power switches of the inverter connected vertically, and the condition that an upper power pipe and a lower power pipe are switched on instantly can not occur. The reliability of the power switches is improved, and the consumption of the power pipes is reduced.
Description
The present invention relates to a kind of inverter, especially DC converting becomes the inverter of interchange.
In the existing inverter circuit that DC converting is become AC power output, when the direct impulse that drives arrives, last power tube conducting, meanwhile, following power tube receives a shutdown signal.But because power transistor exists charge carrier to store effect, transistor will postpone a little time could close fully, and two power tubes all were in the state of opening or not exclusively opening about this just had in a flash.Flow through excessive electric current in this instantaneous power pipe, cause the damage of power tube easily or increase its loss greatly.
The purpose of this invention is to provide a kind of circuit of avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter.
For solving above-mentioned task, the technical solution used in the present invention is: a kind of circuit of avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter, it is made up of delay circuit and voltage divider.Driving signal input at inverter has a delay circuit of being made up of resistance (R) and electric capacity (C), the other end of resistance (R) and (-) end that inserts voltage comparator (IC1) after electric capacity (C) is connected again and (IC2) (+) end, the other end ground connection of electric capacity (C); And also have one by resistance (R1), (R2) and the voltage divider (R3) formed, and resistance (R1) and (+) that (R2) connect voltage comparator (IC1) hold, and (-) that the other end of resistance (R2) and resistance (R3) connect voltage comparator (IC2) holds.
Advantage of the present invention is: overcome loss or damage that the instantaneous short circuit of lower power tube with higher one of dc-to-ac converter of DC converting AC power output causes, improved the reliability of invertor operation.
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Figure one is the inverter electrical schematic diagram
Figure two is an oscillogram
As figure one, the square wave switching pulse Uin that is come by front stage circuits postpones through the simple delay circuit that RC forms, and makes it become trapezoidal wave (figure two), and such trapezoidal wave is delivered on two voltage comparator ics 1 and the IC2 simultaneously.But the benchmark of these two voltage comparators is different, and IC1 is arranged on U1, and IC2 is arranged on U2 (seeing figure two).IC1 has negative sense output when the voltage of trapezoidal wave rises to above U1, and the D1 of photoelectrical coupler lights, and power tube T1 is open-minded.When trapezoidal wave voltage drops to U1, IC1 negative sense end of output, D1 extinguishes, and T1 turn-offs.When trapezoidal wave voltage continued to descend arrival U2, IC2 had negative sense output, and photoelectrical coupler D2 lights, and power tube T2 is open-minded.It is open-minded to see that by figure two T1 turn-offs T2, have one time of delay Δ t, this Δ t guaranteed T1, T2 simultaneously moment open-minded.Same T2 turn-offs T1 and opens also free interval, and moment is open-minded simultaneously.
Setting voltage U1 is greater than 0, and U2 is less than 0, and U1 and U2 utilize the dividing potential drop of R1, R2, R3 to obtain, and has so just guaranteed that resistance value error can not cause U1 to be less than or equal to U2, has guaranteed being perfectly safe of T1, T2.
Claims (1)
1. circuit of avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter, it is characterized in that: it is made up of delay circuit and voltage divider, driving signal input at inverter has a delay circuit of being made up of resistance (R) and electric capacity (C), the other end of resistance (R) and (-) end that inserts voltage comparator (IC1) after electric capacity (C) is connected again and (IC2) (+) end, the other end ground connection of electric capacity (C); And also have one by resistance (R1), (R2) and the voltage divider (R3) formed, and resistance (R1) and (+) that (R2) connect voltage comparator (IC1) hold, and (-) that the other end of resistance (R2) and resistance (R3) connect voltage comparator (IC2) holds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117751A CN1050245C (en) | 1996-10-21 | 1996-10-21 | Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117751A CN1050245C (en) | 1996-10-21 | 1996-10-21 | Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1161597A CN1161597A (en) | 1997-10-08 |
| CN1050245C true CN1050245C (en) | 2000-03-08 |
Family
ID=5124573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96117751A Expired - Fee Related CN1050245C (en) | 1996-10-21 | 1996-10-21 | Circuit for avoiding instantaneous short circuit of lower power tube with higher one of dc-to-ac converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1050245C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060244429A1 (en) * | 2005-04-28 | 2006-11-02 | Astec International Limited | Free wheeling MOSFET control circuit for pre-biased loads |
| CN101847934B (en) * | 2010-05-07 | 2013-01-23 | Bcd半导体制造有限公司 | Switching power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4796146A (en) * | 1985-12-10 | 1989-01-03 | Kabushiki Kaisha Toshiba | Protection circuit for a thyristor converter |
| CN2198701Y (en) * | 1994-06-15 | 1995-05-24 | 无锡宝通电子有限公司 | Protector for silicon control rectifier inverter |
-
1996
- 1996-10-21 CN CN96117751A patent/CN1050245C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4796146A (en) * | 1985-12-10 | 1989-01-03 | Kabushiki Kaisha Toshiba | Protection circuit for a thyristor converter |
| CN2198701Y (en) * | 1994-06-15 | 1995-05-24 | 无锡宝通电子有限公司 | Protector for silicon control rectifier inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1161597A (en) | 1997-10-08 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |