JPH0435838Y2 - - Google Patents
Info
- Publication number
- JPH0435838Y2 JPH0435838Y2 JP1986099628U JP9962886U JPH0435838Y2 JP H0435838 Y2 JPH0435838 Y2 JP H0435838Y2 JP 1986099628 U JP1986099628 U JP 1986099628U JP 9962886 U JP9962886 U JP 9962886U JP H0435838 Y2 JPH0435838 Y2 JP H0435838Y2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- circuit
- diode
- power supply
- integrated circuit
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 21
- 238000010586 diagram Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Electromechanical Clocks (AREA)
- Electric Clocks (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案は自動車用電子回路に係り、特に時計用
の集積回路と表示用の素子とを有する自動車用時
計回路の如き、自動車用電子回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electronic circuit for an automobile, and more particularly to an electronic circuit for an automobile, such as an automobile clock circuit having an integrated circuit for a clock and a display element.
従来の技術
近年、自動車の計器の電子化が著しく、電子化
された計器の一として自動車用時計がある。2. Description of the Related Art In recent years, automobile instruments have become increasingly computerized, and automobile clocks are one example of such electronic instruments.
第２図は従来の自動車用時計の回路図を示す。
同図中、端子１０はバツテリー（図示せず）の正
極に接続され、端子１１はバツテリーの負極に接
続され、端子１２はイグニツシヨンスイツチ（図
示せず）を介してバツテリーの正極に接続されて
いる。 FIG. 2 shows a circuit diagram of a conventional automobile watch.
In the figure, terminal 10 is connected to the positive pole of a battery (not shown), terminal 11 is connected to the negative pole of the battery, and terminal 12 is connected to the positive pole of the battery via an ignition switch (not shown). ing.
時計用集積回路１３はその電源端子VDD，VSS
夫々を抵抗R1、ダイオードD1夫々を介して端子
１０，１１夫々に接続されており、時計用集積回
路１３の出力する時刻表示用の表示駆動信号は螢
光表示管１４のアノードであるセグメント群１４
ａに供給される。これによつて螢光表示管１４は
時刻表示を行なう。 The clock integrated circuit 13 has its power terminals V DD , V SS
The segments are connected to terminals 10 and 11 through a resistor R 1 and a diode D 1, respectively, and a display drive signal for time display outputted from the watch integrated circuit 13 is connected to the segment which is the anode of the fluorescent display tube 14. Group 14
supplied to a. As a result, the fluorescent display tube 14 displays the time.
考案が解決しようとする問題点
自動車のエンジン始動時には端子１０，１１間
の印加電圧が低下し、また接続部品例えばハーネ
ス、コネクタ等に接続不良があると、自動車の振
動によりバツテリーと端子１０，１１との間が瞬
断する。このような場合においても時計用集積回
路１３が正常に動作するよう電源端子VDD．VSS
間にバツクアツプ用のコンデンサC1が接続され
ている。Problems to be Solved by the Invention When starting the engine of a car, the voltage applied between the terminals 10 and 11 decreases, and if there is a poor connection in the connecting parts, such as harnesses, connectors, etc., the battery and terminals 10 and 11 will be damaged due to the vibration of the car. There is a momentary disconnect between the two. Even in such a case, the power supply terminal V DD . V SS
A backup capacitor C1 is connected between them.
しかし、上記の電圧低下及び瞬断時におけるコ
ンデンサC1の放電電流は、時計用集積回路１３
の電源端子VDDからVSSに流れて時計用集積回路
１３を動作させる他に、螢光表示管１４のカソー
ドであるフイラメント１４ｃが加熱されているた
め、時計用集積回路１３からセグメント群１４
ａ、フイラメント１４ｃの経路でセグメント電流
が流れ、また抵抗R1から螢光表示管１４のグリ
ツド１４ｂ、フイラメント１４ｃの経路でグリツ
ド電流が流れる。従つて、コンデンサC1の放電
が速く、時計用集積回路１３を充分にバツクアツ
プするためにはコンデンサC1を大容量としなけ
ればならず、コンデンサC1が大型化し、その価
格も高くなるという問題点があつた。 However, the discharge current of the capacitor C 1 at the time of the above voltage drop and momentary interruption is
In addition to operating the watch integrated circuit 13 by flowing from the power supply terminal V DD to V SS , since the filament 14c, which is the cathode of the fluorescent display tube 14, is heated, the power from the watch integrated circuit 13 to the segment group 14 is
A segment current flows in the path from the resistor R1 to the filament 14c, and a grid current flows in the path from the resistor R1 to the grid 14b of the fluorescent display tube 14 and the filament 14c. Therefore, the capacitor C 1 discharges quickly, and in order to sufficiently back up the watch integrated circuit 13, the capacitor C 1 must have a large capacity, which increases the size and price of the capacitor C 1 . The dot was hot.
そこで、本考案は、ダイオードを追加すること
により、上記の問題点を解決した自動車用電子回
路を提供することを目的とする。 Therefore, an object of the present invention is to provide an electronic circuit for an automobile that solves the above problems by adding a diode.
問題点を解決するための手段
本考案においては、バツテリーよりの電源の電
圧低下時又は瞬断時に、コンデンサの放電電流が
表示素子に流れることを阻止するダイオードを設
けている。Means for Solving the Problems In the present invention, a diode is provided to prevent the discharge current of the capacitor from flowing to the display element when the voltage of the power supply from the battery drops or momentarily interrupts.
作 用
本考案においては、コンデンサの放電電流は全
て集積回路に流れ、表示素子には流れない。この
ためコンデンサの容量を小さくできる。Function In the present invention, all of the discharge current of the capacitor flows to the integrated circuit and does not flow to the display element. Therefore, the capacitance of the capacitor can be reduced.
実施例
第１図は本考案回路の一実施例の回路図を示
す。同図中、第２図と同一部分には同一符号を付
す。Embodiment FIG. 1 shows a circuit diagram of an embodiment of the circuit of the present invention. In this figure, the same parts as in FIG. 2 are given the same reference numerals.
第１図において、バツテリーの正極に接続され
た端子１０は抵抗R1を介して時計用集積回路１
３の電源端子VDDに接続されると共に、傾向表示
管１４のグリツド１４ｂに接続されている。バツ
テリーの負極に接続された端子１１には逆方向電
流阻止用のダイオードD1のカソードが接続され
ている。ダイオードD1のアノードにはダイオー
ドD2のカソードが接続され、ダイオードD2のア
ノードは時計用集積回路１３の電源端子VSSに接
続されている。 In FIG. 1, a terminal 10 connected to the positive terminal of the battery is connected to a watch integrated circuit 1 through a resistor R1.
3 and to the grid 14b of the trend display tube 14. A terminal 11 connected to the negative electrode of the battery is connected to the cathode of a diode D1 for blocking reverse current. The anode of the diode D 1 is connected to the cathode of the diode D 2 , and the anode of the diode D 2 is connected to the power supply terminal V SS of the watch integrated circuit 13 .
時計用集積回路１３は発振回路、分周回路、カ
ウンタ回路、デコーダ回路より大略構成され、電
源端子VDD，VSS間に電圧が印加されると、発振
回路の出力発振信号を分周し、これによつて得ら
れた分周信号をカウンタ回路でカウントする。こ
のカウント値はデコーダ回路でデコードされて螢
光表示管１４のセグメント群１４ａを夫々駆動す
る駆動信号が生成され、セグメント群１４ａに供
給される。 The watch integrated circuit 13 is roughly composed of an oscillator circuit, a frequency divider circuit, a counter circuit, and a decoder circuit, and when a voltage is applied between the power supply terminals V DD and V SS , it divides the output oscillation signal of the oscillation circuit, The frequency-divided signal thus obtained is counted by a counter circuit. This count value is decoded by a decoder circuit to generate drive signals for respectively driving the segment groups 14a of the fluorescent display tube 14, and are supplied to the segment groups 14a.
電源端子VDD，VSS間にはバツクアツプ用のコ
ンデンサC1が接続され、電源端子VDDとダイオー
ドD1のアノードとの間には定電圧化のためのツ
エナーダイオードDz1が接続されている。 A backup capacitor C1 is connected between the power supply terminals V DD and V SS , and a Zener diode Dz 1 for voltage regulation is connected between the power supply terminal V DD and the anode of the diode D1. .
イグニツシヨンスイツチを介してバツテリーの
正極に接続された端子１２は分圧用抵抗R2，R3
を介して螢光表示管１４のフイラメント１４ｃの
一端に接続され、フイラメント１４ｃの他端はダ
イオードD1のアノードに接続されている。また、
抵抗R2、R3の接続点とダイオードD1のアノード
との間は定電圧化のためのツエナーダイオード
Dz2が接続されている。 Terminal 12 connected to the positive terminal of the battery via the ignition switch is connected to voltage dividing resistors R 2 and R 3
The filament 14c is connected to one end of the filament 14c of the fluorescent display tube 14 through the anode of the diode D1 . Also,
A Zener diode is connected between the connection point of resistors R 2 and R 3 and the anode of diode D 1 for voltage regulation.
Dz 2 is connected.
ここで、エンジン始動、振動等により端子１
０，１１間の印加電圧が低下又は瞬断したとき、
コンデンサC1の放電電流は電源端子VDD〜VSSを
流れ、時計用集積回路１３はその動作を持続す
る。しかし、コンデンサC1と電源端子VSSとの接
続点と、螢光表示管１４のフイラメント１４ｃの
一端とダイオードD1のアノードとの接続点との
間にはダイオードD2が設けられているため、セ
グメント電流及びグリツド電流が阻止される。 Here, due to engine startup, vibration, etc., terminal 1
When the applied voltage between 0 and 11 drops or momentarily interrupts,
The discharge current of the capacitor C1 flows through the power supply terminals VDD to VSS , and the watch integrated circuit 13 continues its operation. However, since a diode D2 is provided between the connection point between the capacitor C1 and the power supply terminal VSS and the connection point between one end of the filament 14c of the fluorescent display tube 14 and the anode of the diode D1 , , segment currents and grid currents are blocked.
従つて、コンデンサC1の放電電流は全て時計
用集積回路１３の動作電流として消費される。コ
ンデンサC1の容量を例えば47μFとしたとき、第
２図の回路では端子１０，１１間の印加電圧を遮
断後、時計用集積回路１３は約100msecしか動作
しないが、第１図の回路では略600msec動作す
る。即ち、第１図の回路で動作時間を100msecと
するならばコンデンサC1の容量は従来の1/6程度
で済み、小形化が可能となり、価格を低くでき
る。 Therefore, the entire discharge current of the capacitor C 1 is consumed as the operating current of the watch integrated circuit 13. When the capacitance of capacitor C1 is, for example, 47 μF, in the circuit of FIG. 2, the watch integrated circuit 13 operates for only about 100 msec after cutting off the voltage applied between terminals 10 and 11, but in the circuit of FIG. Operates for 600msec. That is, if the operating time of the circuit shown in FIG. 1 is 100 msec, the capacitance of the capacitor C1 can be reduced to about 1/6 of the conventional capacitance, making it possible to downsize and reduce the price.
なお、第１図の回路において電源端子VSSとダ
イオードD2のアノードとの間に抵抗が接続され
ていても良く、上記実施例に限定されない。 In addition, in the circuit of FIG. 1, a resistor may be connected between the power supply terminal V SS and the anode of the diode D 2 , and the present invention is not limited to the above embodiment.
なお、表示素子としては螢光表示管に限らず、
例えば７セグメントLED（発光ダイオード）等を
用いたものであつても何らかまわない。 Note that display elements are not limited to fluorescent display tubes.
For example, it does not matter if it uses a 7-segment LED (light emitting diode) or the like.
考案の効果
上述の如く、本考案になる自動車用電子回路
は、コンデンサの放電電流は全て集積回路に流
れ、コンデンサの容量を小さくでき、これによつ
てコンデンサの小型化及び低価格化が実現できる
等の特長を有している。Effects of the invention As mentioned above, in the automotive electronic circuit according to the invention, all of the discharge current of the capacitor flows to the integrated circuit, and the capacitance of the capacitor can be reduced, thereby realizing miniaturization and cost reduction of the capacitor. It has the following features.
第１図は本考案回路の一実施例の回路図、第２
図は従来回路の一例の回路図であある。
１３……時計用集積回路、１４……螢光表示
管、C1……コンデンサ、D1，D2……ダイオード、
Dz1，Dz2……ツエナーダイオード、R1〜R3……
抵抗。
Figure 1 is a circuit diagram of an embodiment of the circuit of the present invention, Figure 2 is a circuit diagram of an embodiment of the circuit of the present invention;
The figure is a circuit diagram of an example of a conventional circuit. 13...Clock integrated circuit, 14...Fluorescent display tube, C1 ...Capacitor, D1 , D2 ...Diode,
Dz 1 , Dz 2 ... Zener diode, R 1 ~ R 3 ...
resistance.
Claims (1)
サを接続されており該一対の電源端子間に自動車
のバツテリーより電源を供給されて動作する集積
回路と、該バツテリーより電源を供給されてお
り、該集積回路より表示駆動信号を供給されて表
示動作を行なう表示素子とを有する自動車用電子
回路において、該一対の電源端子間の瞬断時に該
コンデンサの放電電流が該表示素子に流れるのを
阻止するダイオードを設けてなり、該コンデンサ
の放電電流を該集積回路にのみ供給する自動車用
電子回路。 A backup capacitor is connected between a pair of power supply terminals, and an integrated circuit is operated by being supplied with power from a car battery between the pair of power supply terminals. In an automotive electronic circuit having a display element that performs a display operation by being supplied with a display drive signal from a display drive signal, a diode is provided that blocks the discharge current of the capacitor from flowing to the display element in the event of a momentary interruption between the pair of power supply terminals. An electronic circuit for an automobile, comprising: supplying discharge current of the capacitor only to the integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986099628U JPH0435838Y2 (en) | 1986-06-27 | 1986-06-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986099628U JPH0435838Y2 (en) | 1986-06-27 | 1986-06-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS635492U JPS635492U (en) | 1988-01-14 |
| JPH0435838Y2 true JPH0435838Y2 (en) | 1992-08-25 |
Family
ID=30968683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986099628U Expired JPH0435838Y2 (en) | 1986-06-27 | 1986-06-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0435838Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS616471U (en) * | 1984-06-19 | 1986-01-16 | リズム自動車部品製造株式会社 | Boot seal device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54177975U (en) * | 1978-06-05 | 1979-12-15 |
-
1986
- 1986-06-27 JP JP1986099628U patent/JPH0435838Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS616471U (en) * | 1984-06-19 | 1986-01-16 | リズム自動車部品製造株式会社 | Boot seal device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS635492U (en) | 1988-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4123671A (en) | Integrated driver circuit for display device | |
| EP0908799A2 (en) | Electronic clock having an electric power generating element | |
| JP3774360B2 (en) | Wake-up start-up circuit | |
| US4529322A (en) | Booster circuit for electronic watch elements | |
| JPH0435838Y2 (en) | ||
| US4163924A (en) | Circuit for turning on a charging-completion indicator separate from a flash unit | |
| JP2771769B2 (en) | Current control circuit | |
| JPH04324983A (en) | Light emitting element drive power supply circuit | |
| US3979899A (en) | Digital display type electronic time keeper | |
| JPS6216044B2 (en) | ||
| CN218634340U (en) | Breathing lamp control device | |
| JPS6116798Y2 (en) | ||
| CN109654056B (en) | Dual-motor fan control circuit | |
| JP2530320Y2 (en) | Clock constant voltage circuit | |
| JP2574999Y2 (en) | Car clock | |
| CN219349776U (en) | Micro LED driving circuit and micro LED display device | |
| JP2596385B2 (en) | Semiconductor integrated circuit device | |
| JP2509984Y2 (en) | Fluorescent display clock for automobile | |
| JPS5937750Y2 (en) | digital clock | |
| JPS5923744A (en) | Drive control circuit in display device for motor vehicle | |
| CN118150889A (en) | Under-voltage detection circuit and electronic equipment | |
| JPH0830742B2 (en) | Analog electronic clock | |
| JPS5935839Y2 (en) | Electronic clock operation display device | |
| JPS6014233Y2 (en) | voltage converter | |
| JPH0542392Y2 (en) |