JPS63164792U - - Google Patents
Info
- Publication number
- JPS63164792U JPS63164792U JP5600887U JP5600887U JPS63164792U JP S63164792 U JPS63164792 U JP S63164792U JP 5600887 U JP5600887 U JP 5600887U JP 5600887 U JP5600887 U JP 5600887U JP S63164792 U JPS63164792 U JP S63164792U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- filament
- display tube
- chopper
- fluorescent display
- 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
- 230000010355 oscillation Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 3
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
第１図は本発明に係る実施例の回路図、第２図
はチヨツパ回路の動作を説明するタイミングチヤ
ート、第３図はコンデンサＣ１２の動作を説明す
るタイミングチヤートである。
図中、１……バツテリー、２……イグニツシヨ
ンスイツチ、３……ダイオード、４，５，６……
抵抗（Ｒ）、７，１０，１２……コンデンサ（Ｃ
）、８……ツエナーダイオード（ＺＤ）、９，１
３……トランジスタ（Ｑ）、１１……発振回路、
１４……フイラメント、１５……グリツド、１６
……セグメント陽極である。
FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a timing chart explaining the operation of the chopper circuit, and FIG. 3 is a timing chart explaining the operation of the capacitor C12. In the figure, 1... Battery, 2... Ignition switch, 3... Diode, 4, 5, 6...
Resistor (R), 7, 10, 12... Capacitor (C
), 8... Zener diode (ZD), 9, 1
3...transistor (Q), 11...oscillation circuit,
14...Filament, 15...Grid, 16
...It is a segment anode.
Claims (1)
回路において、 該フイラメントに直流電圧を供給するチヨツパ
回路と、 該チヨツパ回路に交流信号を供給する発振回路
と、 前記フイラメントに供給される電力の過剰を検
出する検出回路と、 上記電力過剰を検出すると、前記チヨツパ回路
によるフイラメントへの直流電圧供給を制限する
制限回路を有することを特徴とする蛍光表示管の
フイラメント駆動回路。 (2) 前記検出回路は、前記発振回路の発振停止
を検出する回路を有する事を特徴とする実用新案
登録請求の範囲第１項に記載の蛍光表示管のフイ
ラメント駆動回路。 (3) 前記検出回路は前記チヨツパ回路と発振回
路との間の結合コンデンサであり、該結合コンデ
ンサは、発振回路出力である前記交流信号の直流
成分をカツトすることにより、前記チヨツパ回路
を停止させるようにして、前記制限回路も兼ねる
事を特徴とする実用新案登録請求の範囲第１項に
記載の蛍光表示管のフイラメント駆動回路。 (4) 前記制限回路は、前記チヨツパ回路の出力
を一定電位にシヤントするようなシヤント回路で
ある事を特徴とする実用新案登録請求の範囲第１
項に記載の蛍光表示管のフイラメント駆動回路。[Claims for Utility Model Registration] (1) A drive circuit for driving a filament of a fluorescent display tube, comprising: a chopper circuit that supplies a DC voltage to the filament; an oscillation circuit that supplies an AC signal to the chopper circuit; and the filament. A filament drive circuit for a fluorescent display tube, comprising: a detection circuit for detecting excess power supplied to the filament; and a limiting circuit for restricting DC voltage supply to the filament by the chopper circuit when the excess power is detected. . (2) The filament drive circuit for a fluorescent display tube according to claim 1, wherein the detection circuit includes a circuit for detecting the stoppage of oscillation of the oscillation circuit. (3) The detection circuit is a coupling capacitor between the chopper circuit and the oscillation circuit, and the coupling capacitor stops the chopper circuit by cutting the DC component of the alternating current signal that is the output of the oscillation circuit. The filament drive circuit for a fluorescent display tube according to claim 1, characterized in that the circuit also serves as the limiting circuit. (4) Claim 1 of the utility model registration, characterized in that the limiting circuit is a shunt circuit that shunts the output of the chopper circuit to a constant potential.
A filament drive circuit for a fluorescent display tube as described in 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5600887U JPH0723833Y2 (en) | 1987-04-15 | 1987-04-15 | Fluorescence display tube filament drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5600887U JPH0723833Y2 (en) | 1987-04-15 | 1987-04-15 | Fluorescence display tube filament drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63164792U true JPS63164792U (en) | 1988-10-27 |
| JPH0723833Y2 JPH0723833Y2 (en) | 1995-05-31 |
Family
ID=30884435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5600887U Expired - Lifetime JPH0723833Y2 (en) | 1987-04-15 | 1987-04-15 | Fluorescence display tube filament drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723833Y2 (en) |
-
1987
- 1987-04-15 JP JP5600887U patent/JPH0723833Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0723833Y2 (en) | 1995-05-31 |