JPH02179481A - Apparatus for detecting missing phase of three-phase power source - Google Patents

Apparatus for detecting missing phase of three-phase power source

Info

Publication number
JPH02179481A
JPH02179481A JP63334885A JP33488588A JPH02179481A JP H02179481 A JPH02179481 A JP H02179481A JP 63334885 A JP63334885 A JP 63334885A JP 33488588 A JP33488588 A JP 33488588A JP H02179481 A JPH02179481 A JP H02179481A
Authority
JP
Japan
Prior art keywords
circuit
output
phase
voltage
voltage value
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
JP63334885A
Other languages
Japanese (ja)
Inventor
Atsuyuki Hiruma
Original Assignee
Toshiba Corp
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 filed Critical Toshiba Corp
Priority to JP63334885A priority Critical patent/JPH02179481A/en
Publication of JPH02179481A publication Critical patent/JPH02179481A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make the apparatus compact and to improve reliability by comparing the output voltage from a detecting circuit for three-phase currents with a present constant reference voltage value, and comparing the voltage with a proportional reference voltage value which is present in correspondence with an output voltage value and the like.
CONSTITUTION: Of output lines 1a, 1b and 1c of a three-phase power source 1, it is assumed now that a current detector 4 is connected to the V-phase output line 1b. The detector 4 supplies the output voltage to first and second comparator circuits 5 and 6 in correspondence with the detected current value. In the circuit 5, the output from the detector 4 is compared with the constant reference voltage level from a lowest-level setting circuit 7. The output of the result of the comparison is supplied to an OR circuit 8. The output of a frequency controller 24 in an inverter circuit 2 is supplied to a missing-phase-judging-level output circuit 9, and the proportional reference voltage value corresponding to the output frequency of the inverter is guided out and supplied to the circuit 6. When the output of either of the circuit 5 or 6 is introduced into the circuit 8, the OR circuit 8 guides out and supplies an operation stopping signal C for the circuit 2.
COPYRIGHT: (C)1990,JPO&Japio
JP63334885A 1988-12-28 1988-12-28 Apparatus for detecting missing phase of three-phase power source Pending JPH02179481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63334885A JPH02179481A (en) 1988-12-28 1988-12-28 Apparatus for detecting missing phase of three-phase power source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63334885A JPH02179481A (en) 1988-12-28 1988-12-28 Apparatus for detecting missing phase of three-phase power source

Publications (1)

Publication Number Publication Date
JPH02179481A true JPH02179481A (en) 1990-07-12

Family

ID=18282315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63334885A Pending JPH02179481A (en) 1988-12-28 1988-12-28 Apparatus for detecting missing phase of three-phase power source

Country Status (1)

Country Link
JP (1) JPH02179481A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07184316A (en) * 1993-12-24 1995-07-21 Nec Corp Open phase detecting circuit
JP2011155782A (en) * 2010-01-28 2011-08-11 Daihen Corp Welding power supply
CN102798770A (en) * 2012-08-09 2012-11-28 中国西电电气股份有限公司 Method for detecting default phase of frequency converter
CN104459353A (en) * 2014-11-27 2015-03-25 国家电网公司 PLC transmission instrument
CN111049413A (en) * 2019-12-19 2020-04-21 海信(山东)空调有限公司 Inverter circuit and open-phase detection method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07184316A (en) * 1993-12-24 1995-07-21 Nec Corp Open phase detecting circuit
JP2011155782A (en) * 2010-01-28 2011-08-11 Daihen Corp Welding power supply
CN102798770A (en) * 2012-08-09 2012-11-28 中国西电电气股份有限公司 Method for detecting default phase of frequency converter
CN104459353A (en) * 2014-11-27 2015-03-25 国家电网公司 PLC transmission instrument
CN111049413A (en) * 2019-12-19 2020-04-21 海信(山东)空调有限公司 Inverter circuit and open-phase detection method
CN111049413B (en) * 2019-12-19 2021-04-30 海信(山东)空调有限公司 Inverter circuit and open-phase detection method

Similar Documents

Publication Publication Date Title
JPH0191696A (en) Controller for ac elevator
JPH0287976A (en) Power converter
JPS62104493A (en) Driving device for ac motor
JPS63294289A (en) Control device for commutatorless motor
JPH02179481A (en) Apparatus for detecting missing phase of three-phase power source
JPH02145977A (en) Monitoring device of dc power source
JPS62203565A (en) Inverter apparatus
JPH03226274A (en) Inverter unit
JPH02262831A (en) Elevator controller
JPH02199863A (en) Semiconductor device
JPH03273306A (en) Inspection instrument for driving controller
KR900004072A (en) Inverter overcurrent protection method and circuit
JPS63294264A (en) Inverter controller
JPH03124271A (en) Inverter device restraining harmonics
JPS63217977A (en) Inverter device
JPH04367356A (en) Instrument for detecting phase interruption in low frequency power source for electromagnetic stirring device
JPH0339658A (en) Operation confirmation device for direct-current current transformer
JPH04190678A (en) Voltage type pwm inverter device
JPH01117665A (en) Shifted excitation preventing method for transformer
JPH0265675A (en) Inverter device
JPH04236168A (en) Control circuit for rectifier
JPH04150109A (en) Output circuit for semiconductor device
JPH03243115A (en) Open-phase detector
JPH04285872A (en) Apparatus for detecting quenching phenomenon of superconductor due to conversion of supply current waveform to rectangular wave
JPH0356047A (en) Uninterruptible power supply device