JPS55154491A - Lamp control circuit of electronic watch - Google Patents
Lamp control circuit of electronic watchInfo
- Publication number
- JPS55154491A JPS55154491A JP6248779A JP6248779A JPS55154491A JP S55154491 A JPS55154491 A JP S55154491A JP 6248779 A JP6248779 A JP 6248779A JP 6248779 A JP6248779 A JP 6248779A JP S55154491 A JPS55154491 A JP S55154491A
- Authority
- JP
- Japan
- Prior art keywords
- lighting
- current
- lamp
- resistance
- controlling
- 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
Abstract
PURPOSE: To control the lamp lighting current at the initial period of lighting within a constant value by controlling a switch by way of clock pulses and controlling the electric current for lighting the lamp for lighting by periodic negative feedback.
CONSTITUTION: When the voltage corresponding to the driving current of a lamp 1 by a shunt resistance 7 is applied to a comparator 11 and becomes more than the divided voltage by voltage dividing resistances 19, 20, the output of the comparator 11 inverts and the resistance of a predrive transistor 9 becomes high resistance through the analog switch which is controlled of opening and closing periodically by clock pulses. According to this, the resistance of a transistor 6 becomes high resistance as well and the driving current of the lamp 1 is so controlled by periodic negative feedback controlling as to become constant current. Hence, no rush current is generated at the initial period of lighting and the lamp lighting current becomes within a fixed value, whereby the occurrence of malfunction or the like of the IC circuit owing to the sharp drop of the source battery voltage is prevented.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6248779A JPS55154491A (en) | 1979-05-21 | 1979-05-21 | Lamp control circuit of electronic watch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6248779A JPS55154491A (en) | 1979-05-21 | 1979-05-21 | Lamp control circuit of electronic watch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55154491A true JPS55154491A (en) | 1980-12-02 |
Family
ID=13201575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6248779A Pending JPS55154491A (en) | 1979-05-21 | 1979-05-21 | Lamp control circuit of electronic watch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55154491A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111052211A (en) * | 2017-09-05 | 2020-04-21 | 株式会社电装 | Drive circuit of liquid crystal panel and liquid crystal display device |
-
1979
- 1979-05-21 JP JP6248779A patent/JPS55154491A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111052211A (en) * | 2017-09-05 | 2020-04-21 | 株式会社电装 | Drive circuit of liquid crystal panel and liquid crystal display device |
| CN111052211B (en) * | 2017-09-05 | 2023-01-17 | 株式会社电装 | Drive circuit of liquid crystal panel and liquid crystal display device |
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