JPS5490517A - Commutation system in chopper circuit - Google Patents

Commutation system in chopper circuit

Info

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
Application number
JP15729577A
Other languages
Japanese (ja)
Inventor
Takeshi Koga
Takamasa Kanzaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP15729577A priority Critical patent/JPS5490517A/en
Publication of JPS5490517A publication Critical patent/JPS5490517A/en
Pending legal-status Critical Current

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
JP15729577A 1977-12-28 1977-12-28 Commutation system in chopper circuit Pending JPS5490517A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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