JPS6483156A - Detecting circuit of current - Google Patents

Detecting circuit of current

Info

Publication number
JPS6483156A
JPS6483156A JP23897587A JP23897587A JPS6483156A JP S6483156 A JPS6483156 A JP S6483156A JP 23897587 A JP23897587 A JP 23897587A JP 23897587 A JP23897587 A JP 23897587A JP S6483156 A JPS6483156 A JP S6483156A
Authority
JP
Japan
Prior art keywords
fet
current
sub
main
source current
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
JP23897587A
Other languages
Japanese (ja)
Inventor
Yasuo Noto
Hirohisa Yamamura
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 JP23897587A priority Critical patent/JPS6483156A/en
Publication of JPS6483156A publication Critical patent/JPS6483156A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Current Or Voltage (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE:To conduct the detection of a current by an ON resistance of FET with high accuracy invariably irrespective of a change in temperature, by supplying a source current to FET for current detection thermally-coupled to another FET for switching and by controlling this current. CONSTITUTION:In a motor-operated power steering system for automobiles, a load 2 made up of a DC motor is chopper-controlled by a main FET 3 which is ON-FF controlled by a gate signal supplied from a control unit, and a current I1 flowing through the load 2 on the occasion is detected from a source current I2 of a sub-FET 4 thermally-coupled to the main FET 3. The sub-FET 4 is ON-OFF controlled at the same timing as the main FET 3 by the gate signal supplied to the main FET 3 and it operates to make the source current I2 flow. A differential amplifier 5 receives the respective source voltages V1 and V2 of the main FET 3 and the sub-FET 4 as inputs, generates an output voltage V0 corresponding to a voltage difference between the voltages V1 and V2 and supplies the source current I2 of a prescribed value to the sub-FET 4. A resistor 6 generates a voltage drop due to this source current I2 as a current detection voltage V1.
JP23897587A 1987-09-25 1987-09-25 Detecting circuit of current Pending JPS6483156A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23897587A JPS6483156A (en) 1987-09-25 1987-09-25 Detecting circuit of current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23897587A JPS6483156A (en) 1987-09-25 1987-09-25 Detecting circuit of current

Publications (1)

Publication Number Publication Date
JPS6483156A true JPS6483156A (en) 1989-03-28

Family

ID=17038073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23897587A Pending JPS6483156A (en) 1987-09-25 1987-09-25 Detecting circuit of current

Country Status (1)

Country Link
JP (1) JPS6483156A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007241411A (en) * 2006-03-06 2007-09-20 Ricoh Co Ltd Current detection circuit and current mode dc/dc converter using current detection circuit
JP2008141330A (en) * 2006-11-30 2008-06-19 Ntt Data Ex Techno Corp Amplifier circuit, current-measuring circuit, and integrated circuit element
JP2009075957A (en) * 2007-09-21 2009-04-09 Renesas Technology Corp Power circuit and semiconductor device
JP2009103722A (en) * 2009-02-12 2009-05-14 Fuji Electric Device Technology Co Ltd Current detecting circuit of bidirectional switch
US8410826B2 (en) 2010-04-09 2013-04-02 Panasonic Corporation Load drive circuit with current bidirectional detecting function
CN109073683A (en) * 2016-04-25 2018-12-21 大陆汽车有限公司 For determining the method and battery sensor of load current

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63167277A (en) * 1986-12-17 1988-07-11 エス・ジー・エス　ミクロエレトロニカ　エス・ピー・エー Linear type measuring circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63167277A (en) * 1986-12-17 1988-07-11 エス・ジー・エス　ミクロエレトロニカ　エス・ピー・エー Linear type measuring circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007241411A (en) * 2006-03-06 2007-09-20 Ricoh Co Ltd Current detection circuit and current mode dc/dc converter using current detection circuit
JP2008141330A (en) * 2006-11-30 2008-06-19 Ntt Data Ex Techno Corp Amplifier circuit, current-measuring circuit, and integrated circuit element
JP2009075957A (en) * 2007-09-21 2009-04-09 Renesas Technology Corp Power circuit and semiconductor device
JP2009103722A (en) * 2009-02-12 2009-05-14 Fuji Electric Device Technology Co Ltd Current detecting circuit of bidirectional switch
US8410826B2 (en) 2010-04-09 2013-04-02 Panasonic Corporation Load drive circuit with current bidirectional detecting function
CN109073683A (en) * 2016-04-25 2018-12-21 大陆汽车有限公司 For determining the method and battery sensor of load current

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