JPS6419914A - Inverter overcurrent protector - Google Patents

Inverter overcurrent protector

Info

Publication number
JPS6419914A
JPS6419914A JP62173001A JP17300187A JPS6419914A JP S6419914 A JPS6419914 A JP S6419914A JP 62173001 A JP62173001 A JP 62173001A JP 17300187 A JP17300187 A JP 17300187A JP S6419914 A JPS6419914 A JP S6419914A
Authority
JP
Japan
Prior art keywords
detection circuit
current detection
level
low
circuit
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
JP62173001A
Other languages
Japanese (ja)
Inventor
Izumi Iwaki
Tadashi Tamaoki
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.)
Churyo Engineering Co Ltd
Mitsubishi Heavy Industries Ltd
Original Assignee
Churyo Engineering Co Ltd
Mitsubishi Heavy Industries 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 Churyo Engineering Co Ltd, Mitsubishi Heavy Industries Ltd filed Critical Churyo Engineering Co Ltd
Priority to JP62173001A priority Critical patent/JPS6419914A/en
Publication of JPS6419914A publication Critical patent/JPS6419914A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To protect a power transistor from an overcurrent such as overload, motor lock and load short-circuit without causing a stalling travel by providing a low-level current detection circuit and a high-level current detection circuit. CONSTITUTION:A current signal detected by a current detector 22 provided in an inverter main circuit 2 is inputted to a low-level current detection circuit 4 and a high-level current detection circuit 5. The output of said low-level current detection circuit 4 becomes a base-breaking signal of a base-driving circuit 12 via OR-gates 7-9 and said low-level current detection circuit 4 detects a low-level overcurrent such as motor lock to protect an inverter. Also, said high-level current detection circuit 5 detects a high-level overcurrent such as short circuit current to protect said inverter.
JP62173001A 1987-07-13 1987-07-13 Inverter overcurrent protector Pending JPS6419914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62173001A JPS6419914A (en) 1987-07-13 1987-07-13 Inverter overcurrent protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62173001A JPS6419914A (en) 1987-07-13 1987-07-13 Inverter overcurrent protector

Publications (1)

Publication Number Publication Date
JPS6419914A true JPS6419914A (en) 1989-01-24

Family

ID=15952348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62173001A Pending JPS6419914A (en) 1987-07-13 1987-07-13 Inverter overcurrent protector

Country Status (1)

Country Link
JP (1) JPS6419914A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05284755A (en) * 1992-03-31 1993-10-29 Mitsubishi Electric Corp Controller for inverter
JP2002247857A (en) * 2001-02-19 2002-08-30 Mitsubishi Electric Corp Semiconductor device
WO2007029517A1 (en) * 2005-09-06 2007-03-15 Rohm Co., Ltd. Excess current protection circuit, load driving apparatus, motor driving apparatus, electric equipment, and power supply device
US8111061B2 (en) 2008-06-11 2012-02-07 Keihin Corporation Multi-output determination circuit
US11804796B2 (en) 2019-10-24 2023-10-31 Mitsubishi Electric Corporation Motor drive system and air conditioner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61266021A (en) * 1985-05-20 1986-11-25 三菱電機株式会社 Protector for frequency convertor
JPS6221789B2 (en) * 1978-08-04 1987-05-14 Ube Industries

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6221789B2 (en) * 1978-08-04 1987-05-14 Ube Industries
JPS61266021A (en) * 1985-05-20 1986-11-25 三菱電機株式会社 Protector for frequency convertor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05284755A (en) * 1992-03-31 1993-10-29 Mitsubishi Electric Corp Controller for inverter
JP2002247857A (en) * 2001-02-19 2002-08-30 Mitsubishi Electric Corp Semiconductor device
WO2007029517A1 (en) * 2005-09-06 2007-03-15 Rohm Co., Ltd. Excess current protection circuit, load driving apparatus, motor driving apparatus, electric equipment, and power supply device
JP2007074794A (en) * 2005-09-06 2007-03-22 Rohm Co Ltd Overcurrent protective circuit, load driving unit, motor driving unit, electrical equipment, and power unit
US8111061B2 (en) 2008-06-11 2012-02-07 Keihin Corporation Multi-output determination circuit
US11804796B2 (en) 2019-10-24 2023-10-31 Mitsubishi Electric Corporation Motor drive system and air conditioner

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