JPH01202156A - Transistor switch circuit - Google Patents
Transistor switch circuitInfo
- Publication number
- JPH01202156A JPH01202156A JP2434988A JP2434988A JPH01202156A JP H01202156 A JPH01202156 A JP H01202156A JP 2434988 A JP2434988 A JP 2434988A JP 2434988 A JP2434988 A JP 2434988A JP H01202156 A JPH01202156 A JP H01202156A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- switch
- power supply
- voltage
- resistor
- 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
- 230000020169 heat generation Effects 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
Landscapes
- Power Conversion In General (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は乾電池電源と交流変換直流電源とを切替える回
路等に使用するトランジスタスイッチ回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transistor switch circuit used in a circuit for switching between a dry battery power source and an AC-converted DC power source.
従来の技術
従来、この種のトランジスタスイッチ回路は電池電源と
ベースを抵抗で接続し、ベースにバイアス電圧を与えて
いる。そしてこのベースとグランド間にさらにスイッチ
回路を設け、このスイッチをオン・オフすることによっ
てトランジスタのコレクタとエミッタ間をオン・オフし
スイッチ回路として使用している。BACKGROUND OF THE INVENTION Conventionally, in this type of transistor switch circuit, a battery power source and a base are connected through a resistor, and a bias voltage is applied to the base. A switch circuit is further provided between this base and the ground, and by turning this switch on and off, the connection between the collector and emitter of the transistor is turned on and off, and the transistor is used as a switch circuit.
第２図は従来のトランジスタスイッチ回路構成を示して
いる。第２図において２１は乾電池、２２は抵抗、２３
はトランジスタである。２４は商用電源を直流に変換す
る交直変換電源で、トランジスタの負荷側に接続されて
いる。２５は商用電源投入と同期して作動するスイッチ
、２６は負荷回路、２７は商用電源である。FIG. 2 shows a conventional transistor switch circuit configuration. In Figure 2, 21 is a dry battery, 22 is a resistor, 23
is a transistor. Reference numeral 24 denotes an AC/DC conversion power supply that converts commercial power into DC, and is connected to the load side of the transistor. 25 is a switch that operates in synchronization with turning on the commercial power, 26 is a load circuit, and 27 is a commercial power source.
次に上記従来例の動作について説明する。第２図におい
て商用電源が入るとスイッチ２５がオフし、交直変換電
源２４より負荷回路２６に電流が供給される。又商用電
源が切れるとスイッチ２５がオンし乾電池２１より負荷
回路２６に電流が供給されるようになっている。Next, the operation of the above conventional example will be explained. In FIG. 2, when the commercial power is turned on, the switch 25 is turned off, and current is supplied from the AC/DC converter power supply 24 to the load circuit 26. Further, when the commercial power supply is cut off, the switch 25 is turned on and current is supplied from the dry cell battery 21 to the load circuit 26.
このように従来のトランジスタスイッチ回路でも乾電池
と交流変換直流電源の切替えを行うことは出来る。In this way, the conventional transistor switch circuit can also switch between a dry battery and an AC-converted DC power source.
発明が解決しようとする課題
しかしながら、上記従来のトランジスタスイッチ回路で
は、商用電源が入っている時に、乾電池の電圧が低下す
ると、トランジスタのコレクタとエミッタ間に逆電圧が
印加され、負荷側から乾電池側にもれ電流が流れ込み、
乾電池の発熱、漏液の加速等の問題が発生していた。Problems to be Solved by the Invention However, in the above-mentioned conventional transistor switch circuit, when the voltage of the dry battery drops while the commercial power is on, a reverse voltage is applied between the collector and emitter of the transistor, causing a voltage drop from the load side to the dry cell side. Leakage current flows into
Problems such as dry battery heat generation and accelerated leakage occurred.
゛本発明はこのような従来の問題を解決するものであり
、もれ電流が乾電池側に流れ込まない優れたトランジス
タスイッチ回路を提供することを目的とするものである
。The present invention solves these conventional problems and aims to provide an excellent transistor switch circuit in which leakage current does not flow into the dry cell side.
課題を解決するだめの手段
本発明は上記目的を達成するためにトランジスタのベー
スにバイアス電圧を与える抵抗に直列にダイオードを入
れ、トランジスタのオフ状態でベースに流れる電流を完
全に遮断しトランジスタに逆電圧が印加されても、漏れ
電流が乾電池側に流れ込まないようにしたものである。Means for Solving the Problems In order to achieve the above object, the present invention inserts a diode in series with a resistor that applies a bias voltage to the base of a transistor, completely cuts off the current flowing to the base when the transistor is off, and reverses the current flowing to the transistor. This prevents leakage current from flowing into the dry cell side even when voltage is applied.
作用
本発明は上記のような構成によ９次のような効果を有す
る。すなわちトランジスタに逆電圧が印加されても、も
れ電流が流れないため、乾電池が発熱したシ、漏液を加
速するという問題を除去できる。Operation The present invention has the following effects due to the above-described configuration. In other words, even if a reverse voltage is applied to the transistor, no leakage current flows, which eliminates the problem of the dry battery generating heat and accelerating leakage.
実施例
第１図は本発明の一実施例によるトランジスタスイッチ
回路のブロック図である。第１図において、１１は乾電
池、１２は乾電池１１にアノード側が接続されたダイオ
ード、１３はダイオード１２のカソード側に一端が接続
された抵抗、１４はエミッタに乾電池１１が接続されベ
ースに抵抗１３の他端が接続されたＰＮＰ型トランジス
タである。１５はトランジスタ１４のベースとアース間
に接続されたスイッチであシ、交直変換電源１６によっ
て開閉するものである。１７はトランジスタ１４のコレ
クタおよび交直変換電源１６に接続された負荷回路であ
る。Embodiment FIG. 1 is a block diagram of a transistor switch circuit according to an embodiment of the present invention. In FIG. 1, 11 is a dry cell, 12 is a diode whose anode side is connected to the dry cell battery 11, 13 is a resistor whose one end is connected to the cathode side of the diode 12, and 14 is a resistor 13 whose emitter is connected to the dry cell battery 11 and whose base is connected to the dry cell 11. It is a PNP type transistor with the other end connected. A switch 15 is connected between the base of the transistor 14 and the ground, and is opened and closed by an AC/DC converter power supply 16. 17 is a load circuit connected to the collector of the transistor 14 and the AC/DC conversion power supply 16.
次に本実施例の動作について説明する。Next, the operation of this embodiment will be explained.
第１図において商用電源が入ると、スイッチ１５がオフ
し、交直変換電源１６よシ負荷回路１７に電流が供給さ
れる。又、商用電源が切れると、スイッチ１５がオンし
、乾電池１６より負荷回路１７に電流が供給される。In FIG. 1, when the commercial power supply is turned on, the switch 15 is turned off, and current is supplied to the AC/DC conversion power supply 16 and the load circuit 17. Further, when the commercial power supply is turned off, the switch 15 is turned on, and current is supplied from the dry cell battery 16 to the load circuit 17.
乾電池１１の電圧が交直変換電源１６の電圧より低くな
た場合でも、交直変換電源１６の電流は乾電池１１には
流れない。すなわち、交直変換電源１６の電圧は、トラ
ンジスタ１４のコレクタ、ベース、抵抗１３に達しても
ダイオード１２が電圧を阻止するので、乾電池１１には
達しない。従って、乾電池の発熱、漏液の加速等の問題
がなくなる。Even when the voltage of the dry cell battery 11 becomes lower than the voltage of the AC/DC converter power source 16, the current of the AC/DC converter power source 16 does not flow to the dry cell battery 11. That is, even if the voltage of the AC/DC conversion power supply 16 reaches the collector, base, and resistor 13 of the transistor 14, it does not reach the dry battery 11 because the diode 12 blocks the voltage. Therefore, problems such as heat generation and accelerated leakage of dry cells are eliminated.
発明の効果
本発明は上記実施例より明らかなように、トランジスタ
のベースにバイアス電圧を与える抵抗に直列にダイオー
ドを入れ、トランジスタのオフ状態でベースに流れる電
流を完全に遮断するという構成にしたので、トランジス
タに逆電圧が印加されても、漏れ電流が乾電池側に流れ
込まないため乾電池が発熱したり、漏液を加速したシと
いう問題を除去できるという効果を有する。Effects of the Invention As is clear from the above embodiments, the present invention has a structure in which a diode is inserted in series with a resistor that applies a bias voltage to the base of a transistor, and the current flowing to the base is completely cut off when the transistor is off. Even if a reverse voltage is applied to the transistor, leakage current does not flow into the dry cell side, which has the effect of eliminating problems such as heat generation of the dry cell battery and accelerated leakage.
第１図は本発明の一実施例によるトランジスタスイッチ
回路のブロック図、第２図は従来例のブロック図である
。
１１・・・乾電池、１２・・・ダイオード、１３・・・
抵抗、１４・・・ＰＮＰ型、トランジスタ、１５・・・
スイッチ、１６・・・交直変換電源、１７・・・負荷回
路。
代理人の氏名 弁理士 中 尾 敏 男ほか１名第１図
／
第２ ＵｌＪFIG. 1 is a block diagram of a transistor switch circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 11... Dry battery, 12... Diode, 13...
Resistor, 14...PNP type, transistor, 15...
Switch, 16...AC/DC conversion power supply, 17...Load circuit. Name of agent: Patent attorney Toshio Nakao and one other figure 1/2 UlJ
Claims (1)
、このダイオードのカソードと一端が接続された抵抗と
、この抵抗の他端がベースに、上記電池がエミッタに接
続されたＰＮＰ型トランジスタと、このトランジスタの
ベースとアースに開閉制御可能に取り付けられたスイッ
チと、商用電源を入力して直流に変換し、上記スイッチ
の開閉を制御する交直変換電源と、この交直変換電源お
よび上記トランジスタのコレクタに接続された負荷回路
とを備えたトランジスタスイッチ回路。A battery, a diode whose anode is connected to the battery, a resistor whose one end is connected to the cathode of the diode, a PNP transistor whose base is the other end of the resistor and whose emitter is connected to the battery; A switch attached to the base of the transistor and the ground so that opening and closing can be controlled, an AC/DC converting power supply that inputs commercial power, converts it to DC, and controls the opening/closing of the switch, and connects this AC/DC converting power supply to the collector of the transistor. A transistor switch circuit with a load circuit and a
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63024349A JP2754553B2 (en) | 1988-02-03 | 1988-02-03 | Transistor switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63024349A JP2754553B2 (en) | 1988-02-03 | 1988-02-03 | Transistor switch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01202156A true JPH01202156A (en) | 1989-08-15 |
| JP2754553B2 JP2754553B2 (en) | 1998-05-20 |
Family
ID=12135718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63024349A Expired - Fee Related JP2754553B2 (en) | 1988-02-03 | 1988-02-03 | Transistor switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2754553B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147927A (en) * | 1979-05-07 | 1980-11-18 | Tokyo Shibaura Electric Co | Power supply circuit |
| JPS5857289U (en) * | 1981-10-12 | 1983-04-18 | オムロン株式会社 | switching regulator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5857289B2 (en) * | 1976-10-27 | 1983-12-19 | 積水化学工業株式会社 | Manufacturing method of thermoplastic resin bent pipe |
-
1988
- 1988-02-03 JP JP63024349A patent/JP2754553B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147927A (en) * | 1979-05-07 | 1980-11-18 | Tokyo Shibaura Electric Co | Power supply circuit |
| JPS5857289U (en) * | 1981-10-12 | 1983-04-18 | オムロン株式会社 | switching regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2754553B2 (en) | 1998-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |