JPS559238A - Detector for quantity of electricity of differential type - Google Patents

Detector for quantity of electricity of differential type

Info

Publication number
JPS559238A
JPS559238A JP8075678A JP8075678A JPS559238A JP S559238 A JPS559238 A JP S559238A JP 8075678 A JP8075678 A JP 8075678A JP 8075678 A JP8075678 A JP 8075678A JP S559238 A JPS559238 A JP S559238A
Authority
JP
Japan
Prior art keywords
output
positive
voltage
negative
converter
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
JP8075678A
Other languages
Japanese (ja)
Inventor
Tetsuo Ukawa
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 JP8075678A priority Critical patent/JPS559238A/en
Publication of JPS559238A publication Critical patent/JPS559238A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Voltage And Current In General (AREA)

Abstract

PURPOSE: The differential type quantity of electricity detector, which enables positive and negative side return, less operation of control variable, and greater controlled quantity.
CONSTITUTION: The AC voltage Va1 corresponding to the current in electric furnace, for example, is converted into DC Va2 with the AC to DC converter 1, and the reference voltage Vb1 in proportional to the phase voltage of the furnace is converted into DC Vb2 with another AC to DC converter 2. The voltages are fed to the differential voltage detection circuit 3, and if the absolute value of the both is equal, output is 0, and if Va2 is greater, positive output is obtained, and if Vb2 is greater, negative output is obtained. Further, the output is fed in parallel with the first and second level detection circuits 4 and 5, and the signal of positive and negative operation can be obtained with this and three NAND gates 6,7,8. Thus, when the electrode control for electrode type electric furnace is made, for example, it is expected that the effect can be obtained for less lifting up and down operatin of electrodes.
COPYRIGHT: (C)1980,JPO&Japio
JP8075678A 1978-07-03 1978-07-03 Detector for quantity of electricity of differential type Pending JPS559238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8075678A JPS559238A (en) 1978-07-03 1978-07-03 Detector for quantity of electricity of differential type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8075678A JPS559238A (en) 1978-07-03 1978-07-03 Detector for quantity of electricity of differential type

Publications (1)

Publication Number Publication Date
JPS559238A true JPS559238A (en) 1980-01-23

Family

ID=13727245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8075678A Pending JPS559238A (en) 1978-07-03 1978-07-03 Detector for quantity of electricity of differential type

Country Status (1)

Country Link
JP (1) JPS559238A (en)

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