JPS56164416A - Constant current control circuit - Google Patents
Constant current control circuitInfo
- Publication number
- JPS56164416A JPS56164416A JP6802480A JP6802480A JPS56164416A JP S56164416 A JPS56164416 A JP S56164416A JP 6802480 A JP6802480 A JP 6802480A JP 6802480 A JP6802480 A JP 6802480A JP S56164416 A JPS56164416 A JP S56164416A
- Authority
- JP
- Japan
- Prior art keywords
- level signal
- current
- prescribed
- turned
- outputs
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
Landscapes
- Dot-Matrix Printers And Others (AREA)
Abstract
PURPOSE:To decrease the number of leader lines from a load, by turning on a switching element with the condition that a current detecting value exceeds a prescribed value after a prescribed time when the switching element is turned off, in a print driving mechanism of an impact type dot printer. CONSTITUTION:When a control signal is fed, an AND gate 25 outputs a high level signal, turning on a transistor (TR)21 and a current I flowing to a magnet coil 3 increases with a prescribed rate. Further, when the current I exceeds a prescribed value, the output of a comparison circuit 27 is fallen down and a monostable multivibrator 26 outputs a low level signal for a prescribed time. The TR21 is turned off by this low level signal, and when the TR21 is turned off, the current I decreases in a prescrived rate, and when the output of the monostable multivibrator 26 is switched to a high level, the gate 25 again outputs a high level signal to turn on the TR21. Thus, the number of leader lines from the load can be decreased, allowing to make the control with comparatively high accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6802480A JPS56164416A (en) | 1980-05-21 | 1980-05-21 | Constant current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6802480A JPS56164416A (en) | 1980-05-21 | 1980-05-21 | Constant current control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56164416A true JPS56164416A (en) | 1981-12-17 |
Family
ID=13361821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6802480A Pending JPS56164416A (en) | 1980-05-21 | 1980-05-21 | Constant current control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56164416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4523251A (en) * | 1981-10-13 | 1985-06-11 | Erwin Sick Gmbh Optik-Elektronik | Electronic apparatus comprising an input stage with a binary output connected to a relay control circuit |
| JPS61188843U (en) * | 1985-05-17 | 1986-11-25 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5392651A (en) * | 1977-01-24 | 1978-08-14 | Motorola Inc | Crystalltuned voltage control oscillator |
| JPS54139048A (en) * | 1978-04-20 | 1979-10-29 | Mitsubishi Electric Corp | Dc control circuit |
-
1980
- 1980-05-21 JP JP6802480A patent/JPS56164416A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5392651A (en) * | 1977-01-24 | 1978-08-14 | Motorola Inc | Crystalltuned voltage control oscillator |
| JPS54139048A (en) * | 1978-04-20 | 1979-10-29 | Mitsubishi Electric Corp | Dc control circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4523251A (en) * | 1981-10-13 | 1985-06-11 | Erwin Sick Gmbh Optik-Elektronik | Electronic apparatus comprising an input stage with a binary output connected to a relay control circuit |
| JPS61188843U (en) * | 1985-05-17 | 1986-11-25 |
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