JPS6481685A - Current detection circuit - Google Patents
Current detection circuitInfo
- Publication number
- JPS6481685A JPS6481685A JP62235467A JP23546787A JPS6481685A JP S6481685 A JPS6481685 A JP S6481685A JP 62235467 A JP62235467 A JP 62235467A JP 23546787 A JP23546787 A JP 23546787A JP S6481685 A JPS6481685 A JP S6481685A
- Authority
- JP
- Japan
- Prior art keywords
- current detection
- detection signal
- core
- offset portion
- signals
- 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
Links
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
PURPOSE:To prevent the current detection signal of an AC servo motor from being affected by a DC offset portion by connecting a circuit for cancelling the influence of a residual magnetic flux in a core with the output side of a magnetic conversion element. CONSTITUTION:A change of the magnetic flux quantity of a core 1 caused by a change of electric current flowing through the wire wound round said core 1 is converted into an electric signal by a Hall effect element 2 and outputted as a current detection signal S1. Said current detection signal S1 is caused to pass through first and second half-wave rectifier circuits 5, 6 with polarities reversed to each other to obtain respective half-wave rectification signals S2, S3 where only one of positive and negative signals is rectified. Then, said signals S2, S3 are added and smoothed so that a DC offset portion V may be taken out. Said added and smoothed signal S4 and the current detection signal S1 are inputted to an amplifier circuit 7 to obtain a current detection signal where the DC offset portion is cancelled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62235467A JPS6481685A (en) | 1987-09-18 | 1987-09-18 | Current detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62235467A JPS6481685A (en) | 1987-09-18 | 1987-09-18 | Current detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6481685A true JPS6481685A (en) | 1989-03-27 |
Family
ID=16986521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62235467A Pending JPS6481685A (en) | 1987-09-18 | 1987-09-18 | Current detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6481685A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100375507B1 (en) * | 2000-07-25 | 2003-03-10 | 삼성전기주식회사 | Output stabilizing method of inverter circuit |
JP2009268285A (en) * | 2008-04-28 | 2009-11-12 | Meidensha Corp | Electric-motor control device, electric-motor control method, and elevator device |
-
1987
- 1987-09-18 JP JP62235467A patent/JPS6481685A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100375507B1 (en) * | 2000-07-25 | 2003-03-10 | 삼성전기주식회사 | Output stabilizing method of inverter circuit |
JP2009268285A (en) * | 2008-04-28 | 2009-11-12 | Meidensha Corp | Electric-motor control device, electric-motor control method, and elevator device |
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