JPS6484157A - Method and device for current detection - Google Patents
Method and device for current detectionInfo
- Publication number
- JPS6484157A JPS6484157A JP62243478A JP24347887A JPS6484157A JP S6484157 A JPS6484157 A JP S6484157A JP 62243478 A JP62243478 A JP 62243478A JP 24347887 A JP24347887 A JP 24347887A JP S6484157 A JPS6484157 A JP S6484157A
- Authority
- JP
- Japan
- Prior art keywords
- time
- current
- counted
- value
- inputted
- 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.)
- Granted
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Inverter Devices (AREA)
Abstract
PURPOSE:To reduce the size of the device and lessen the influence of a pulsating component, and to enable high-accuracy current detection up to a low current area by converting a current into pulses proportional to its current value and counting the pulses, and then generating a pulse counted value. CONSTITUTION:When such a high current that the pulses is inputted at, for example, a sampling period Tc is supplied, a multiplied pulse signal is counted by a reversible counter 22 and the counted values M(i-1) and M(i) are stored in a register A23 every time a pulse is inputted. A counter 25, on the other hand, counts a reference clock and T(i-1) and T(I) are stored as time counted values in a register A26 every time a multiplied pulse is inputted. Then the contents of the registers A23 and A26 are stored in registers B24 and B27 and then read out at the time of sampling S(i-1) and S(i). The read current counted value M and time counted value T are therefore values at the time of pulse signal input and irrelevant to the sampling period Tss. The current value Im is therefore calculated with hgh accuracy from IM=KXM(i)-M(i-1)/T(i)-T (i-1) (T: constant).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62243478A JPH0638086B2 (en) | 1987-09-28 | 1987-09-28 | Current detection method and device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62243478A JPH0638086B2 (en) | 1987-09-28 | 1987-09-28 | Current detection method and device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5310502A Division JP2539170B2 (en) | 1993-12-10 | 1993-12-10 | Current detection method and device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6484157A true JPS6484157A (en) | 1989-03-29 |
JPH0638086B2 JPH0638086B2 (en) | 1994-05-18 |
Family
ID=17104487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62243478A Expired - Fee Related JPH0638086B2 (en) | 1987-09-28 | 1987-09-28 | Current detection method and device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0638086B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0735784A (en) * | 1993-07-22 | 1995-02-07 | Hitachi Ltd | Power converter |
CN112666461A (en) * | 2021-03-17 | 2021-04-16 | 臻驱科技(上海)有限公司 | Current estimation method of inverter direct current side, motor controller, current detection device and electric automobile |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5353376U (en) * | 1976-10-08 | 1978-05-08 | ||
JPS57179668A (en) * | 1981-04-28 | 1982-11-05 | Fanuc Ltd | Detecting circuit for frequency |
JPS58205864A (en) * | 1982-05-26 | 1983-11-30 | Fuji Electric Co Ltd | Apparatus for measuring pulse frequency |
JPS59100866A (en) * | 1982-12-01 | 1984-06-11 | Hitachi Ltd | Digital type speed detector |
-
1987
- 1987-09-28 JP JP62243478A patent/JPH0638086B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5353376U (en) * | 1976-10-08 | 1978-05-08 | ||
JPS57179668A (en) * | 1981-04-28 | 1982-11-05 | Fanuc Ltd | Detecting circuit for frequency |
JPS58205864A (en) * | 1982-05-26 | 1983-11-30 | Fuji Electric Co Ltd | Apparatus for measuring pulse frequency |
JPS59100866A (en) * | 1982-12-01 | 1984-06-11 | Hitachi Ltd | Digital type speed detector |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0735784A (en) * | 1993-07-22 | 1995-02-07 | Hitachi Ltd | Power converter |
CN112666461A (en) * | 2021-03-17 | 2021-04-16 | 臻驱科技(上海)有限公司 | Current estimation method of inverter direct current side, motor controller, current detection device and electric automobile |
CN112666461B (en) * | 2021-03-17 | 2021-05-25 | 臻驱科技(上海)有限公司 | Current estimation method of inverter direct current side, motor controller, current detection device and electric automobile |
Also Published As
Publication number | Publication date |
---|---|
JPH0638086B2 (en) | 1994-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |