JPS5490517A - Commutation system in chopper circuit - Google Patents
Commutation system in chopper circuitInfo
- Publication number
- JPS5490517A JPS5490517A JP15729577A JP15729577A JPS5490517A JP S5490517 A JPS5490517 A JP S5490517A JP 15729577 A JP15729577 A JP 15729577A JP 15729577 A JP15729577 A JP 15729577A JP S5490517 A JPS5490517 A JP S5490517A
- Authority
- JP
- Japan
- Prior art keywords
- gto
- gate
- given
- current
- thyristor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To prevent a gate turn-off thyristor (GTO) from damage, by such means that an auxiliary thyristor be used for turning off the GTO with the commutation operated to part of the way, and a negative pulse be given at the time of decreasing point of a current flowing in the GTO.
CONSTITUTION: With a gate turn-off thyristor GTO being off, a current is supplied to a commutation condenser Cmc through an auxiliary thyristor ACRF. If given a positive pulse to a gate of the GTO, a current flows in a DC motor M. Subsequently, if given a pulse to a gate of the auxiliary thyristor ACRF, an electric charge of the commutation condenser Cmc is discharged through the GTO. At the time when the current in the GTO is attenuated to a certain degree, with a negative pulse, at a level corresponding to the current value, given to the gate of the GTO, the GTO is made turn-off.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15729577A JPS5490517A (en) | 1977-12-28 | 1977-12-28 | Commutation system in chopper circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15729577A JPS5490517A (en) | 1977-12-28 | 1977-12-28 | Commutation system in chopper circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5490517A true JPS5490517A (en) | 1979-07-18 |
Family
ID=15646530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15729577A Pending JPS5490517A (en) | 1977-12-28 | 1977-12-28 | Commutation system in chopper circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5490517A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60118022A (en) * | 1983-11-29 | 1985-06-25 | 三菱電機株式会社 | Overcurrent protecting circuit of gate turn off thyristor |
-
1977
- 1977-12-28 JP JP15729577A patent/JPS5490517A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60118022A (en) * | 1983-11-29 | 1985-06-25 | 三菱電機株式会社 | Overcurrent protecting circuit of gate turn off thyristor |
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