JPS57139673A - Detection circuit for direct current - Google Patents
Detection circuit for direct currentInfo
- Publication number
- JPS57139673A JPS57139673A JP2488981A JP2488981A JPS57139673A JP S57139673 A JPS57139673 A JP S57139673A JP 2488981 A JP2488981 A JP 2488981A JP 2488981 A JP2488981 A JP 2488981A JP S57139673 A JPS57139673 A JP S57139673A
- Authority
- JP
- Japan
- Prior art keywords
- current
- thyristors
- direct current
- turned
- period
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
PURPOSE:To detect a current on the AC side and thereby to obtain a current equivalent to the current of the DC side by providing an electric valve and an arithmetic and memory ciruit operating when thyristors are turned ON on the occasion when a direct current is supplied to a loady by a mixed bridge containing the thyristors. CONSTITUTION:An alternating current is converted into a direct current by a bridge consisting of diodes 4 and 5 and the thyristors 2 and 3 and the direct current thus obtained is supplied to the load 6 of the field coil or the like. Meanwhile, the current on the AC side is detected by a current transformer 13, the output thereof and a voltage on the DC side are detected by a photocoupler 22 and connected to the electric valve 24 which is turned ON during a period when the thyristors 2 and 3 are turned ON and to the arithmetic and memory circuit containing an operational amplifier 17, and the output of the circuit is compared with a reference value in a setting unit 9 to control the thyristors 2 and 3. Accordingly, an output proportional to a detected current is obtained in the period when the thrystors 2 and 3 are ON, while the current is memorized in the period when they are OFF, and thereby a current waveform equivalent to the one on the load side can be obtained by detecting the current of the AC side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2488981A JPS57139673A (en) | 1981-02-24 | 1981-02-24 | Detection circuit for direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2488981A JPS57139673A (en) | 1981-02-24 | 1981-02-24 | Detection circuit for direct current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57139673A true JPS57139673A (en) | 1982-08-28 |
Family
ID=12150748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2488981A Pending JPS57139673A (en) | 1981-02-24 | 1981-02-24 | Detection circuit for direct current |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57139673A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02223863A (en) * | 1988-12-23 | 1990-09-06 | Daimler Benz Ag | Method and apparatus for measuring current to be pulsated of induction load |
| CN102495321A (en) * | 2011-12-21 | 2012-06-13 | 中国科学院上海微系统与信息技术研究所 | Method for generating and identifying non-linear signal in semiconductor non-linear oscillation system |
-
1981
- 1981-02-24 JP JP2488981A patent/JPS57139673A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02223863A (en) * | 1988-12-23 | 1990-09-06 | Daimler Benz Ag | Method and apparatus for measuring current to be pulsated of induction load |
| CN102495321A (en) * | 2011-12-21 | 2012-06-13 | 中国科学院上海微系统与信息技术研究所 | Method for generating and identifying non-linear signal in semiconductor non-linear oscillation system |
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