JPH06335157A - Protective circuit - Google Patents
Protective circuitInfo
- Publication number
- JPH06335157A JPH06335157A JP12161193A JP12161193A JPH06335157A JP H06335157 A JPH06335157 A JP H06335157A JP 12161193 A JP12161193 A JP 12161193A JP 12161193 A JP12161193 A JP 12161193A JP H06335157 A JPH06335157 A JP H06335157A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- connection terminal
- voltage
- output
- 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
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- Protection Of Static Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は保護回路に関し、特に定
電圧電源回路に接続されたトランジスタスイッチング回
路の保護回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection circuit, and more particularly to a protection circuit for a transistor switching circuit connected to a constant voltage power supply circuit.
【０００２】[0002]
【従来の技術】トランジスタによってスイッチングを行
う回路を有する定電圧回路は、図２に示すように、基準
電位が供給される基準電位接続端子ＧＴと、基準電位を
基準に直流電源電圧ＶBBが供給される直流電源接続端子
ＶBBＴと、直流電源電圧ＶBBを入力とし定電圧ＶCCを出
力する定電圧電源回路２と、一端が基準電位接続端子Ｇ
Ｔに接続され他端が電源接続端子ＶBBＴに接続されるコ
ンデンサＣと、ベースが信号入力接続端子ＨＷＩに接続
され、エミッタが基準電位接続端子ＧＴに接続され、コ
レクタが信号出力接続端子ＨＷＯと抵抗Ｒの一端に接続
されたトランジスタＱと、一端が前記抵抗Ｒの他端に接
続され他端が直流電源装置１の基準電位に接続された出
力電源３とから構成されている。2. Description of the Related Art As shown in FIG. 2, a constant voltage circuit having a circuit for switching by a transistor supplies a reference potential connection terminal GT to which a reference potential is supplied and a DC power supply voltage V BB based on the reference potential. DC power supply connection terminal V BB T, constant voltage power supply circuit 2 which inputs DC power supply voltage V BB and outputs constant voltage V CC , and one end of which is reference potential connection terminal G
A capacitor C connected to T and the other end connected to a power supply connection terminal V BB T, a base connected to a signal input connection terminal HWI, an emitter connected to a reference potential connection terminal GT, and a collector connected to a signal output connection terminal HWO. And a transistor Q connected to one end of the resistor R, and an output power supply 3 having one end connected to the other end of the resistor R and the other end connected to the reference potential of the DC power supply device 1.
【０００３】上記従来の回路構成における作用は次のと
おりである。The operation of the above-mentioned conventional circuit configuration is as follows.
【０００４】定電圧電源回路２への電源供給は、先ず、
直流電源装置１の基準電位を基準電位接続端子ＧＴに供
給し、その後電源電圧ＶBBを直流電源接続端子ＶBBＴに
供給する。定電圧電源回路２は、直流電源装置１からの
電源供給により定電圧を出力する。コンデンサＣは直流
電源装置１と定電圧電源回路２で発生する雑音を除去す
るためのものである。抵抗Ｒは出力電源３から常時電圧
が印加されている。To supply power to the constant voltage power supply circuit 2, first,
The reference potential of the DC power supply device 1 is supplied to the reference potential connection terminal GT, and then the power supply voltage V BB is supplied to the DC power supply connection terminal V BB T. The constant voltage power supply circuit 2 outputs a constant voltage by the power supply from the DC power supply device 1. The capacitor C is for removing noise generated in the DC power supply device 1 and the constant voltage power supply circuit 2. A voltage is constantly applied to the resistor R from the output power supply 3.
【０００５】信号入力接続端子ＨＷＩに低レベルの電圧
を入力してトランジスタＱをカットオフさせると、信号
出力接続端子ＨＷＯの出力電圧は、出力電源３の出力電
圧をＶCCO 、抵抗Ｒに流れる電流をＩCCO とすると、Ｖ
CCO −ＩCCO ・Ｒとなる。また、信号入力接続端子ＨＷ
Ｉに高レベルの電圧を入力してトランジスタＱを飽和さ
せると、信号出力接続端子ＨＷＯの出力電圧は、トラン
ジスタＱのコレクタとエミッタ間電圧ＶＣＥとなる。When a low level voltage is input to the signal input connection terminal HWI to cut off the transistor Q, the output voltage of the signal output connection terminal HWO is the output voltage of the output power supply 3 V CCO , and the current flowing through the resistor R. Let I CCO be V
CCO- I CCO · R. Also, the signal input connection terminal HW
When a high level voltage is input to I to saturate the transistor Q, the output voltage of the signal output connection terminal HWO becomes the collector-emitter voltage VCE of the transistor Q.
【０００６】[0006]
【発明が解決しようとする課題】前記従来の定電圧電源
回路に接続されたトランジスタスイッチング回路では、
定電圧電源回路２への電源供給時において、もし直流電
源装置１の基準電位が基準電位接続端子ＧＴに供給され
るより先に、直流電源装置１の電源電圧ＶBBが直流電源
接続端子ＶBBＴに供給された場合には、出力電源３−抵
抗Ｒ−トランジスタＱのコレクタ−トランジスタＱのエ
ミッタ−コンデンサＣ−直流電源装置１のルートに、抵
抗Ｒ、トランジスタＱ及びコンデンサＣが許容している
電流値以上の過渡電流が流れ、抵抗Ｒ、トランジスタＱ
及びコンデンサＣが破壊されるという問題点があった。In the conventional transistor switching circuit connected to the constant voltage power supply circuit,
When power is supplied to the constant voltage power supply circuit 2, the power supply voltage V BB of the DC power supply 1 is supplied to the DC power supply connection terminal V BB before the reference potential of the DC power supply 1 is supplied to the reference potential connection terminal GT. When supplied to T, the resistor R, the transistor Q and the capacitor C are allowed in the route of the output power supply 3-resistor R-the collector of the transistor Q-the emitter of the transistor Q-the capacitor C-the route of the DC power supply device 1. Transient current more than current value flows, resistance R, transistor Q
Also, there is a problem that the capacitor C is destroyed.
【０００７】この問題点を解決するために、例えば長さ
の異なる接続端子により、長い接続端子で先に基準電位
を供給し、その後短い接続端子で電源電圧ＶBBを供給す
るという構造の接続器が使用された。In order to solve this problem, for example, by connecting terminals having different lengths, a reference potential is first supplied at a long connecting terminal and then a power supply voltage V BB is supplied at a short connecting terminal. Was used.
【０００８】しかし、長さの異なる接続端子によって先
に基準電位を供給し、その後電源電圧ＶBBを供給するシ
ーケンス構造は、接続端子の摩耗によって上述の目的を
確保できない場合があるという問題点があった。However, the sequence structure in which the reference potential is first supplied by the connection terminals having different lengths and then the power supply voltage V BB is supplied may have a problem in that the above-mentioned purpose may not be secured due to wear of the connection terminals. there were.
【０００９】またコンデンサＣを削除することも考えら
れるが、それでは、出力電源３−抵抗Ｒ−トランジスタ
Ｑのコレクタ−トランジスタＱのエミッタ−直流電源装
置１のルートに過渡電流は流れないが、直流電源装置１
と定電圧電源回路２で発生する雑音を除去できないとい
う問題点がある。It is also conceivable to remove the capacitor C. In this case, a transient current does not flow in the route of the output power supply 3-resistor R-collector of the transistor Q-emitter of the transistor Q-DC power supply device 1, but the DC power supply is used. Device 1
There is a problem that noise generated in the constant voltage power supply circuit 2 cannot be removed.
【００１０】本発明の目的は、定電圧電源回路に接続さ
れたトランジスタスイッチング回路において、従来技術
にあった電源供給時に回路素子に流れる過渡電流による
回路素子の破壊防止を解決できる保護回路を提供するこ
とにある。An object of the present invention is to provide, in a transistor switching circuit connected to a constant voltage power supply circuit, a protection circuit which can prevent the destruction of the circuit element due to a transient current flowing in the circuit element at the time of supplying power, which is in the prior art. Especially.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明の定電圧電源回路に接続されたトランジスタ
スイッチング回路の保護回路は、基準電位を供給する基
準電位接続端子と、基準電位を基準に直流電源を供給す
る直流電源接続端子とを有する直流電源装置と、前記基
準電位接続端子と直流電源接続端子の間に接続されたコ
ンデンサと、前記コンデンサに並列に接触させて、直流
電源を供給し定電圧を出力する定電圧電源回路と、信号
入力接続端子と信号出力接続端子と、ベースが前記信号
入力接続端子に接続され、エミッタが前記基準電位接続
端子に接続され、コレクタが前記信号出力接続端子に接
続されると共に抵抗を介して出力電源の一端に接続され
るトランジスタスイッチング回路と、他端が前記基準電
位接続端子に接続される出力電源と、前記定電圧電源回
路の出力電圧を検出する電圧検出回路と、前記トランジ
スタのコレクタ側に設けられ、前記電圧検出回路の検出
信号により開閉するスイッチ回路とを具備するものであ
る。In order to achieve the above object, a protection circuit for a transistor switching circuit connected to a constant voltage power supply circuit according to the present invention includes a reference potential connection terminal for supplying a reference potential and a reference potential connection terminal. A DC power supply device having a DC power supply connection terminal for supplying a DC power supply to a reference, a capacitor connected between the reference potential connection terminal and the DC power supply connection terminal, and a DC power supply by contacting the capacitor in parallel. A constant voltage power supply circuit that supplies a constant voltage, a signal input connection terminal and a signal output connection terminal, a base is connected to the signal input connection terminal, an emitter is connected to the reference potential connection terminal, and a collector is the signal. A transistor switching circuit connected to the output connection terminal and connected to one end of the output power supply through a resistor, and the other end connected to the reference potential connection terminal An output power source, a voltage detection circuit for detecting an output voltage of the constant voltage power supply circuit, provided to the collector of said transistor, in which includes a switch circuit for opening and closing by the detection signal of the voltage detection circuit.
【００１２】[0012]
【作用】上記のように構成された保護回路においては、
定電圧電源回路への電源供給時において、直流電源装置
の基準電位が基準電位接続端子ＧＴに供給されないで、
直流電源装置の電源電圧ＶBBが直流電源接続端子ＶBBＴ
に供給された場合に、定電圧電源回路は、定電圧ＶCCを
出力しないため、電圧検出回路は検出信号ＶＳＴをスイ
ッチ回路へ出力しない。これにより、スイッチ回路のス
イッチは開いており、したがってトランジスタＱのコレ
クタは抵抗Ｒを介して出力電源と接続されないので、出
力電源３−抵抗Ｒ−トランジスタＱのコレクタ−トラン
ジスタＱのエミッタ−コンデンサＣ−直流電源装置１の
ルートに過渡電流が流れることがない。In the protection circuit configured as described above,
At the time of supplying power to the constant voltage power supply circuit, the reference potential of the DC power supply device is not supplied to the reference potential connection terminal GT,
The power supply voltage V BB of the DC power supply device is the DC power supply connection terminal V BB T
, The constant voltage power supply circuit does not output the constant voltage V CC , and therefore the voltage detection circuit does not output the detection signal VST to the switch circuit. As a result, the switch of the switch circuit is open, and therefore the collector of the transistor Q is not connected to the output power supply through the resistor R, so that the output power supply 3-resistor R-the collector of the transistor Q-the emitter of the transistor Q-the capacitor C- No transient current flows in the route of the DC power supply 1.
【００１３】[0013]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例の保護回路である。この図
１において図２と同一符号のものは同一内容部分を示
す。The present invention will be described below with reference to the drawings. FIG. 1 shows a protection circuit according to an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 2 indicate the same contents.
【００１４】図１において、直流電源装置１と、定電圧
電源回路２と、基準電位接続端子と直流電源接続端子の
間に接続されたコンデンサＣと、信号入力接続端子及び
信号出力接続端子と、出力電源３及び信号回路のスイッ
チングを行うトランジスタＱから成る回路に、更に、電
圧検出回路４と、スイッチの一端がトランジスタのコレ
クタに接続され、他端が抵抗Ｒを介して出力電源の一
端、及び信号出力端子に接続され、前記電圧検出回路の
検出信号によりスイッチを開閉するスイッチ回路５を設
けた構成となっている。In FIG. 1, a DC power supply device 1, a constant voltage power supply circuit 2, a capacitor C connected between a reference potential connection terminal and a DC power supply connection terminal, a signal input connection terminal and a signal output connection terminal, The output power source 3 and a circuit including a transistor Q for switching the signal circuit are further connected to the voltage detection circuit 4, one end of the switch is connected to the collector of the transistor, and the other end is connected through a resistor R to one end of the output power source, and A switch circuit 5 is provided which is connected to the signal output terminal and opens and closes the switch according to the detection signal of the voltage detection circuit.
【００１５】定電圧電源回路２は、直流電源装置１から
基準電位接続端子ＧＴと直流電源接続端子ＶBBＴを介し
て供給される電源により定電圧ＶCCを出力する。電圧検
出回路４は定電圧電源回路２の出力電圧ＶCCを検出し
て、検出信号ＶＳＴをスイッチ回路５へ出力する。スイ
ッチ回路５は電圧検出回路４の検出信号ＶＳＴによりス
イッチを閉じて、トランジスタＱのコレクタと抵抗Ｒを
介して出力電源３を接続する。The constant voltage power supply circuit 2 outputs a constant voltage V CC from a power supply supplied from the DC power supply device 1 via the reference potential connection terminal GT and the DC power supply connection terminal V BB T. The voltage detection circuit 4 detects the output voltage V CC of the constant voltage power supply circuit 2 and outputs a detection signal VST to the switch circuit 5. The switch circuit 5 closes the switch according to the detection signal VST of the voltage detection circuit 4, and connects the collector of the transistor Q and the output power source 3 via the resistor R.
【００１６】定電圧電源回路２への電源供給時におい
て、直流電源装置１の基準電位が基準電位接続端子ＧＴ
に供給されないで、直流電源装置１の電源電圧ＶBBが直
流電源接続端子ＶBBＴに供給された場合に、定電圧電源
回路２は定電圧ＶCCを出力しないため、電圧検出回路４
は検出信号ＶＳＴをスイッチ回路５へ出力しない。これ
によりスイッチ回路５のスイッチは開いておりトランジ
スタＱのコレクタは、抵抗Ｒを介して出力電源３と接続
されないので、出力電源３−抵抗Ｒ−トランジスタＱの
コレクタ−トランジスタＱのエミッタ−コンデンサＣ−
直流電源装置１のルートに過渡電流は流れない。When power is supplied to the constant voltage power supply circuit 2, the reference potential of the DC power supply device 1 is the reference potential connection terminal GT.
When the power supply voltage V BB of the DC power supply device 1 is supplied to the DC power supply connection terminal V BB T without being supplied to the DC power supply device 1, the constant voltage power supply circuit 2 does not output the constant voltage V CC.
Does not output the detection signal VST to the switch circuit 5. As a result, the switch of the switch circuit 5 is open, and the collector of the transistor Q is not connected to the output power supply 3 via the resistor R. Therefore, the output power supply 3-resistor R-the collector of the transistor Q-the emitter of the transistor Q-the capacitor C-
No transient current flows through the route of the DC power supply 1.
【００１７】基準電位接続端子ＧＴと電源接続端子ＶBB
Ｔに直流電源装置１が接続され基準電位と電源電圧ＶBB
が供給されると定電圧電源回路２は出力電圧ＶCCを出力
し、電圧検出回路４は定電圧電源回路２の出力電圧ＶCC
を検出しスイッチ回路５へ検出信号ＶＳＴを出力し、ス
イッチ回路５は電圧検出回路４の検出信号ＶＳＴにより
スイッチを閉じて、トランジスタＱのコレクタと抵抗Ｒ
を介して出力電源３を接続する。Reference potential connection terminal GT and power supply connection terminal V BB
The DC power supply device 1 is connected to T to connect the reference potential and the power supply voltage V BB.
Is supplied, the constant voltage power supply circuit 2 outputs the output voltage V CC , and the voltage detection circuit 4 outputs the constant voltage power supply circuit 2 output voltage V CC.
Is detected and the detection signal VST is output to the switch circuit 5, and the switch circuit 5 closes the switch by the detection signal VST of the voltage detection circuit 4 to collect the collector of the transistor Q and the resistor R.
The output power supply 3 is connected via.
【００１８】[0018]
【発明の効果】以上説明したように本発明は、定電圧電
源回路の出力電圧を検出し検出信号を出力する電圧検出
回路と、スイッチの一端がトランジスタのコレクタに接
続され他端が抵抗を介して出力電源に接続され検出信号
によりスイッチの開閉を行うスイッチ回路を備えたの
で、基準電位が基準電位接続端子に供給されるより先に
電源電圧が直流電源接続端子に供給された場合にも、出
力電源−抵抗−トランジスタのコレクタ−トランジスタ
のエミッタ−コンデンサＣ−直流電源装置のルートに過
渡電流が流れないので、抵抗、トランジスタ及びコンデ
ンサが過渡電流によって破壊されないという効果を有す
る。As described above, according to the present invention, the voltage detection circuit for detecting the output voltage of the constant voltage power supply circuit and outputting the detection signal, one end of the switch is connected to the collector of the transistor and the other end is connected through the resistor. Since it is equipped with a switch circuit that is connected to the output power supply and opens and closes the switch according to the detection signal, even if the power supply voltage is supplied to the DC power supply connection terminal before the reference potential is supplied to the reference potential connection terminal, Since the transient current does not flow through the route of the output power source-resistor-transistor collector-transistor emitter-capacitor C-DC power supply device, there is an effect that the resistor, the transistor and the capacitor are not destroyed by the transient current.
【００１９】したがって、先に基準電位を供給しその後
電源電圧を供給するシーケンスは不必要という効果を有
する。したがって長さの異なる接続端子も不要になり、
同一種類の接続端子で済むので接続端子の共用化が図れ
そのための経済性が得られるという効果も有する。Therefore, there is an effect that the sequence of supplying the reference potential first and then supplying the power supply voltage is unnecessary. Therefore, connection terminals with different lengths are unnecessary,
Since the same type of connection terminal is sufficient, the connection terminal can be used in common and the economical efficiency can be obtained.
【図１】本発明の保護回路の一実施例のブロック図であ
る。FIG. 1 is a block diagram of an embodiment of a protection circuit of the present invention.
【図２】従来の一実施例のブロック図である。FIG. 2 is a block diagram of a conventional example.
１ 直流電源装置 ２ 定電圧電源回路 ３ 出力電源 ４ 電圧検出回路 ５ スイッチ回路 Ｑ トランジスタ Ｒ 抵抗 Ｃ コンデンサ ＨＷＩ 信号入力接続端子 ＨＷＯ 信号出力接続端子 ＧＴ 基準電位接続端子 ＶBBＴ 直流電源接続端子 ＶＳＴ 検出信号1 DC power supply device 2 Constant voltage power supply circuit 3 Output power supply 4 Voltage detection circuit 5 Switch circuit Q transistor R resistance C capacitor HWI signal input connection terminal HWO signal output connection terminal GT reference potential connection terminal V BB T DC power supply connection terminal VST detection signal
Claims (1)
と、基準電位を基準に直流電源を供給する直流電源接続
端子とを有する直流電源装置と、 前記基準電位接続端子と直流電源接続端子の間に接続さ
れたコンデンサと、 前記コンデンサに並列に接触させて、直流電源を供給し
定電圧を出力する定電圧電源回路と、 信号入力接続端子と信号出力接続端子と、 ベースが前記信号入力接続端子に接続され、エミッタが
前記基準電位接続端子に接続され、コレクタが前記信号
出力接続端子に接続されると共に抵抗を介して出力電源
の一端に接続されるトランジスタスイッチング回路と、 他端が前記基準電位接続端子に接続される出力電源と、 前記定電圧電源回路の出力電圧を検出する電圧検出回路
と、 前記トランジスタのコレクタ側に設けられ、前記電圧検
出回路の検出信号により開閉するスイッチ回路とを具備
するところの定電圧電源回路に接続されたトランジスタ
スイッチング回路の保護回路。1. A DC power supply device having a reference potential connection terminal for supplying a reference potential and a DC power supply connection terminal for supplying a DC power supply with reference to the reference potential, and between the reference potential connection terminal and the DC power supply connection terminal. A constant voltage power supply circuit that outputs a constant voltage by supplying DC power to the capacitor connected in parallel with the capacitor, a signal input connection terminal and a signal output connection terminal, and a base having the signal input connection terminal. A transistor switching circuit having an emitter connected to the reference potential connection terminal, a collector connected to the signal output connection terminal, and a resistor connected to one end of an output power source, and the other end connected to the reference potential. An output power supply connected to the connection terminal, a voltage detection circuit for detecting the output voltage of the constant voltage power supply circuit, and provided on the collector side of the transistor, Protection circuit of a transistor switching circuit connected to the constant voltage power supply circuit where having a switch circuit for opening and closing the detection signal of the serial voltage detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5121611A JP2591425B2 (en) | 1993-05-24 | 1993-05-24 | Protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5121611A JP2591425B2 (en) | 1993-05-24 | 1993-05-24 | Protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06335157A true JPH06335157A (en) | 1994-12-02 |
| JP2591425B2 JP2591425B2 (en) | 1997-03-19 |
Family
ID=14815544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5121611A Expired - Fee Related JP2591425B2 (en) | 1993-05-24 | 1993-05-24 | Protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2591425B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6454735U (en) * | 1987-09-30 | 1989-04-04 | ||
| JPH02125545U (en) * | 1989-02-02 | 1990-10-16 |
-
1993
- 1993-05-24 JP JP5121611A patent/JP2591425B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6454735U (en) * | 1987-09-30 | 1989-04-04 | ||
| JPH02125545U (en) * | 1989-02-02 | 1990-10-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2591425B2 (en) | 1997-03-19 |
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