JPS6293670A - Voltage drop display method - Google Patents
Voltage drop display methodInfo
- Publication number
- JPS6293670A JPS6293670A JP23415485A JP23415485A JPS6293670A JP S6293670 A JPS6293670 A JP S6293670A JP 23415485 A JP23415485 A JP 23415485A JP 23415485 A JP23415485 A JP 23415485A JP S6293670 A JPS6293670 A JP S6293670A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- transistor
- terminal
- base terminal
- diode
- 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
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電池等の直流電源を持つ機器の電圧低下表示回
路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a voltage drop indicating circuit for equipment having a DC power source such as a battery.
従来の技術
従来、この種の電圧低下表示回路は第２図のように構成
されている。モータ１０７ を負荷としたこの機器では
、定電圧ダイオード１０２による基準電圧と、抵抗１０
３と１０４による分割電圧とを比較器１旧で比較して電
池１０６の電圧低下時に発光ダイオードｌＯ５を点灯さ
せたり、あるいは比較器１０１の反転入力端子と非反転
入力端子への入力を逆にして電圧低下時に発光ダイオー
ド１０５を消灯させることにより、電圧の低下を表示し
ていた。１０８．１０９の抵抗はそれぞれ電流制限用で
ある。2. Description of the Related Art Conventionally, this type of voltage drop display circuit has been constructed as shown in FIG. In this device with a motor 107 as a load, a reference voltage from a constant voltage diode 102 and a resistor 10
3 and the voltage divided by 104 are compared by the comparator 1 old, and the light emitting diode 1O5 is turned on when the voltage of the battery 106 drops, or the inputs to the inverting input terminal and the non-inverting input terminal of the comparator 101 are reversed. The voltage drop was indicated by turning off the light emitting diode 105 when the voltage dropped. The resistors 108 and 109 are each for current limiting.
発明が解決しようとする問題点
このような従来の構成では回路構成が複雑なうえ、比較
器１０１を使用しているためその電源が必要となるが、
その電源電圧自体が変動するため、比較器１０１の動作
が不安定になることがあり、あまり電圧が低いところで
は、動作しなくなるという問題点があった。Problems to be Solved by the Invention In such a conventional configuration, the circuit configuration is complicated, and since the comparator 101 is used, a power source is required for the comparator 101.
Since the power supply voltage itself fluctuates, the operation of the comparator 101 may become unstable, and there is a problem in that the comparator 101 stops operating at an extremely low voltage.
本発明は簡単な構成で、しかも低電圧でも安定に動作す
る電圧低下表示回路を堤供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a voltage drop display circuit that has a simple configuration and operates stably even at low voltages.
問題点を解決するための手段
本発明の電圧低下表示回路は、直流電源の電圧を抵抗分
割してトランジスタのベース端子に印加し、前記１〜ラ
ンジスタのエミッタ端子を抵抗を介して前記直流電源の
正極側に接続し、定電圧ダイオードのカソード側を前記
トランジスタのエミッタ端子に接続し、前記定電圧ダイ
オードのアノード側を１ｒｊ記直流電源の負極側に接続
し、前記トランジスタのコレクタ端子と前記直流電源の
負極側との間に発光ダイオードを介装したことを特徴と
する。Means for Solving the Problems The voltage drop display circuit of the present invention divides the voltage of a DC power supply by resistors and applies the divided voltage to the base terminals of transistors, and connects the emitter terminals of the transistors 1 to 1 to the emitter terminals of the DC power supply through resistors. The cathode side of the voltage regulator diode is connected to the emitter terminal of the transistor, the anode side of the voltage regulator diode is connected to the negative electrode side of the DC power source 1rj, and the collector terminal of the transistor and the DC power source are connected to the positive electrode side. A light emitting diode is interposed between the negative electrode side and the negative electrode side.
作用
この構成によると、ＰＮＰＮ上形ンジスタのベース端子
の電位がエミッタ端子の電位より約０．６Ｖ低くなった
ときに導通状態（ＯＮ状態）になることを利用し、エミ
ッタ端子の電位を定電圧ダイオードで固定しておき、ベ
ース端子の電位が電源電圧によって変化すると、直流電
源の電圧が低下したときに、トランジスタがＯＮ状態に
なって発光ダイオードが点灯する。Function: According to this configuration, the potential of the emitter terminal is set to a constant voltage by utilizing the fact that it becomes conductive (ON state) when the potential of the base terminal of the PNPN upper type transistor becomes approximately 0.6 V lower than the potential of the emitter terminal. If it is fixed with a diode and the potential of the base terminal changes depending on the power supply voltage, when the voltage of the DC power supply decreases, the transistor turns on and the light emitting diode lights up.
実施例 以下、本発明の一実施例を第１図に基づいて説明する。Example An embodiment of the present invention will be described below with reference to FIG.
第１図は電池１を直流電源、モータ３を負荷、２を電源
スィッチとした機器に取付けられた本発明の電圧低下表
示回路を示す。４はＰＮＰ形のトランジスタ、４Ｅ、４
Ｃ，４Ｂはそれぞれトランジスタ４のエミッタ端子、コ
レクタ端子、ベース端子を示している６５は定電圧ダイ
オードで、抵抗６を通して電流が供給されてエミッタ端
子４Ｅの電位をほぼ一定の値に保っている。７及び８は
電圧分割用の抵抗で、電池１の電圧を適当分割して得た
電圧は電流制限用の抵抗９を介してベース端子４Ｂに印
加されている。従って、ベース端子４Ｂの電位は電池１
の電圧の変化に応じて変化する。１０はトランジスタ４
の動作安定のための抵抗。FIG. 1 shows a voltage drop indicating circuit of the present invention installed in a device in which a battery 1 is a DC power source, a motor 3 is a load, and 2 is a power switch. 4 is a PNP type transistor, 4E, 4
C and 4B indicate the emitter terminal, collector terminal, and base terminal of the transistor 4, respectively. 65 is a constant voltage diode, to which a current is supplied through the resistor 6 to keep the potential of the emitter terminal 4E at a substantially constant value. 7 and 8 are voltage dividing resistors, and the voltage obtained by appropriately dividing the voltage of the battery 1 is applied to the base terminal 4B via a current limiting resistor 9. Therefore, the potential of base terminal 4B is
Varies according to changes in voltage. 10 is transistor 4
resistance for stable operation.
１１は発光ダイオードである。11 is a light emitting diode.
前記の定電圧ダイオード５のツェナー電圧値Ｖ２と抵抗
７，８の値は次のように設定されている。The Zener voltage value V2 of the voltage regulator diode 5 and the values of the resistors 7 and 8 are set as follows.
つまり、電圧低下の検出電圧をＶａ、抵抗７と８の値を
Ｒ，、Ｒ，とすると、
（Ｒ，／ （Ｒ７＋Ｒ，）） −Ｖａ＋０．６＝ＶＺ
という関係式が成りたつ。In other words, if the voltage drop detection voltage is Va and the values of resistors 7 and 8 are R,, R, then (R,/ (R7+R,)) -Va+0.6=VZ
The following relational expression holds true.
°このように構成したため、電池１の電圧がまだ充分に
高いときには、ベース端子４Ｂの電位はエミッタ端子４
Ｅよりも高くなっているため、ベース端子４Ｂには電流
が流れず、従ってトランジスタ４はＯＦＦ状態であって
５発光ダイオード１１は点灯しない。° Because of this configuration, when the voltage of the battery 1 is still sufficiently high, the potential of the base terminal 4B is equal to that of the emitter terminal 4.
Since it is higher than E, no current flows through the base terminal 4B, so the transistor 4 is in the OFF state and the light emitting diode 5 11 does not light up.
ところが、モータ３の負荷が急に大きくなったり、電池
１が消耗して電圧がＶＡまで低下すると、ベース端子４
Ｂに電流が流れてトランジスタ４がＯＮ状態になり発光
ダイオード１１が点灯して電圧低下を知らせる。However, if the load on the motor 3 suddenly increases or the battery 1 is exhausted and the voltage drops to VA, the base terminal 4
A current flows through B, turning on the transistor 4 and lighting the light emitting diode 11 to notify the voltage drop.
このように簡単な構成と簡単な動作で、電圧低下表示回
路が実現でき、その検出電圧も抵抗値７゜８と定電圧ダ
イオード５によって任意に設定でき。With such a simple configuration and simple operation, a voltage drop display circuit can be realized, and its detection voltage can also be arbitrarily set using the resistance value of 7.8 and the constant voltage diode 5.
またその動作電圧も、比較器を用いた従来の方法よりも
かなり低いところまで設定することができる。The operating voltage can also be set to a much lower level than in the conventional method using a comparator.
発明の効果
以上の説明から明らかなように本発明の電圧低下表示回
路は、１つのトランジスタと定電圧ダイオードを組合せ
た、簡単な構成のもので、任意の電圧それも低い電圧値
の検出が可能となり、その応用の範囲はかなり広いもの
があって、その効果は大なるものがある。また、回路構
成が簡単にできるため、従来のものに比べて安価なもの
にでき。Effects of the Invention As is clear from the above explanation, the voltage drop display circuit of the present invention has a simple configuration combining one transistor and a constant voltage diode, and is capable of detecting any voltage, even low voltage values. Therefore, the scope of its application is quite wide, and its effects are great. Also, because the circuit configuration is simple, it can be made cheaper than conventional ones.
信頼性の向上もはかることができる。Reliability can also be improved.
第１図は本発明の電圧低下表示回路の一実施例の回路図
、第２図は従来例の回路図である。
１・・・電池〔直流電源〕、４・・・トランジスタ、５
・・・定電圧ダイオード、６，７，８．９・・・抵抗、
１１・・・発光ダイオード
代理人 森 本 義 弘
第１図
１・・・電池し１流電！Ｊ
３・・・七−タ
ｔｌ・・・ｆ尤ダイオード
第２図FIG. 1 is a circuit diagram of an embodiment of the voltage drop display circuit of the present invention, and FIG. 2 is a circuit diagram of a conventional example. 1...Battery [DC power supply], 4...Transistor, 5
... Constant voltage diode, 6, 7, 8.9... Resistor,
11...Light-emitting diode representative Yoshihiro MorimotoFigure 11...Battery and 1 current! J 3...7-ta tl...f diode Figure 2
Claims (1)
ス端子に印加し、前記トランジスタのエミッタ端子を抵
抗を介して前記直流電源の正極側に接続し、定電圧ダイ
オードのカソード側を前記トランジスタのエミッタ端子
に接続し、前記定電圧ダイオードのアノード側を前記直
流電源の負極側に接続し、前記トランジスタのコレクタ
端子と前記直流電源の負極側との間に発光ダイオードを
介装した電圧低下表示回路。1. Divide the voltage of a DC power supply with a resistor and apply it to the base terminal of a transistor, connect the emitter terminal of the transistor to the positive side of the DC power supply via a resistor, and connect the cathode side of the constant voltage diode to the emitter of the transistor. a voltage drop indicating circuit, which is connected to a terminal, an anode side of the voltage regulator diode is connected to a negative electrode side of the DC power source, and a light emitting diode is interposed between the collector terminal of the transistor and the negative electrode side of the DC power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23415485A JPS6293670A (en) | 1985-10-18 | 1985-10-18 | Voltage drop display method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23415485A JPS6293670A (en) | 1985-10-18 | 1985-10-18 | Voltage drop display method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6293670A true JPS6293670A (en) | 1987-04-30 |
Family
ID=16966493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23415485A Pending JPS6293670A (en) | 1985-10-18 | 1985-10-18 | Voltage drop display method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6293670A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS559438B1 (en) * | 1971-04-06 | 1980-03-10 | ||
| JPS55147365A (en) * | 1979-05-04 | 1980-11-17 | Koito Mfg Co Ltd | Device for warning reduction of capacity of battery |
-
1985
- 1985-10-18 JP JP23415485A patent/JPS6293670A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS559438B1 (en) * | 1971-04-06 | 1980-03-10 | ||
| JPS55147365A (en) * | 1979-05-04 | 1980-11-17 | Koito Mfg Co Ltd | Device for warning reduction of capacity of battery |
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