JPS5526071A - Digital pulse phase shifter - Google Patents

Digital pulse phase shifter

Info

Publication number
JPS5526071A
JPS5526071A JP9909378A JP9909378A JPS5526071A JP S5526071 A JPS5526071 A JP S5526071A JP 9909378 A JP9909378 A JP 9909378A JP 9909378 A JP9909378 A JP 9909378A JP S5526071 A JPS5526071 A JP S5526071A
Authority
JP
Japan
Prior art keywords
control angle
register
control circuit
digital
digital control
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
JP9909378A
Other languages
Japanese (ja)
Inventor
Yojiro Miyahara
Kenzo Kamiyama
Noboru Azusawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9909378A priority Critical patent/JPS5526071A/en
Publication of JPS5526071A publication Critical patent/JPS5526071A/en
Pending legal-status Critical Current

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  • Power Conversion In General (AREA)

Abstract

PURPOSE: To prevent the inflow of overcurrent due to the failure in commutation, by automatically changing a control angle for a prescribed time after the stoppage of a digital control circuit.
CONSTITUTION: A time-up detection circuit 33 generates a low output when no control angle signal is entered for a prescribed time. A flip-flop 34 performs shifting when it receives a shifting instruction. A control angle register 32 can be used as either a counter or a register. When the digital control circuit 7 is normal, the control angle register 32 is used as a register. When the digital control circuit is abnormal, the control angle register is used as counter. A control angle instruction is thus changed at a constant ratio after the stoppage of the digital control circuit. A thyristor gate pulse is thereafter suppressed. Even if a digital controller becomes abnormal due to some cause, the thyristor gate pulse is not immediately eliminated and the control angle is once shifted and then suppressed. Therefore, no commutation failure takes place even in inverter operation.
COPYRIGHT: (C)1980,JPO&Japio
JP9909378A 1978-08-16 1978-08-16 Digital pulse phase shifter Pending JPS5526071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9909378A JPS5526071A (en) 1978-08-16 1978-08-16 Digital pulse phase shifter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9909378A JPS5526071A (en) 1978-08-16 1978-08-16 Digital pulse phase shifter

Publications (1)

Publication Number Publication Date
JPS5526071A true JPS5526071A (en) 1980-02-25

Family

ID=14238257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9909378A Pending JPS5526071A (en) 1978-08-16 1978-08-16 Digital pulse phase shifter

Country Status (1)

Country Link
JP (1) JPS5526071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5833968A (en) * 1981-08-21 1983-02-28 Hitachi Ltd Gate pulse generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5833968A (en) * 1981-08-21 1983-02-28 Hitachi Ltd Gate pulse generator
JPH0250695B2 (en) * 1981-08-21 1990-11-05 Hitachi Ltd

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