JPH06242845A - DC stabilized power supply - Google Patents
DC stabilized power supplyInfo
- Publication number
- JPH06242845A JPH06242845A JP2517493A JP2517493A JPH06242845A JP H06242845 A JPH06242845 A JP H06242845A JP 2517493 A JP2517493 A JP 2517493A JP 2517493 A JP2517493 A JP 2517493A JP H06242845 A JPH06242845 A JP H06242845A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- battery
- reset
- power supply
- input power
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電池を入力電圧とする
リセット機能付きの直流安定化電源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stabilized DC power supply device with a reset function that uses a battery as an input voltage.
【０００２】[0002]
【従来の技術】従来の技術について図３を参照して説明
する。図３は、従来の直流安定化電源装置の回路図であ
る。2. Description of the Related Art A conventional technique will be described with reference to FIG. FIG. 3 is a circuit diagram of a conventional DC stabilized power supply device.
【０００３】図３に示すように、従来の直流安定化電源
装置は、出力電圧ＶOを分圧抵抗Ｒ1，Ｒ2によって分圧
した電圧及び基準電圧Ｖref1を誤差増幅器Ｖ1に入力
し、両電圧の差を増幅して、その差がなくなるようにト
ランジスタＱ1のベース電流をトランジスタＱ2により制
御する構成としている。As shown in FIG. 3, in the conventional DC stabilized power supply device, the voltage obtained by dividing the output voltage V O by the voltage dividing resistors R 1 and R 2 and the reference voltage Vref 1 are input to the error amplifier V 1. , And the base current of the transistor Q 1 is controlled by the transistor Q 2 so as to eliminate the difference.
【０００４】また、リセット出力端子Ｖｒは電源投入
時、リセット信号出力部１の出力トランジスタＱ4が抵
抗Ｒ5を通じてオン状態となるためＬＯＷレベルとな
り、電源投入時からコンパレータＣ1が動作開始するま
でシステムを初期状態にする。そして、コンパレータＣ
1が動作開始すると、分圧抵抗Ｒ3，Ｒ4による分圧と基
準電圧Ｖref2とを比較しトランジスタＱ3をオン状態と
し、Ｑ4をオフさせリセット出力をＨＩＧＨレベルにし
て、システム起動開始の信号とする。Further, the reset output terminal Vr becomes LOW level when the power is turned on, because the output transistor Q 4 of the reset signal output section 1 is turned on through the resistor R 5 , and from the time when the power is turned on until the comparator C 1 starts operating. Initialize the system. And the comparator C
When 1 starts operating, the voltage division by the voltage dividing resistors R 3 and R 4 and the reference voltage Vref 2 are compared, the transistor Q 3 is turned on, Q 4 is turned off, the reset output is set to HIGH level, and the system starts to start. Signal.
【０００５】そして、抵抗Ｒ3，Ｒ4にて分圧された電圧
がＶref2より低下するとトランジスタＱ3はオフし、再
び抵抗Ｒ5を通してトランジスタＱ4がオン状態となりリ
セット出力をＬＯＷレベルに落とし、システムの誤動作
を防止する。When the voltage divided by the resistors R 3 and R 4 becomes lower than Vref 2 , the transistor Q 3 turns off, the transistor Q 4 turns on again through the resistor R 5 , and the reset output drops to LOW level. , Prevent malfunction of system.
【０００６】なお、Ｒ6、Ｃはリセット出力用の抵抗及
びコンデンサである。R 6 and C are resistors and capacitors for reset output.
【０００７】[0007]
【発明が解決しようとする課題】ところで、前述した従
来の直流安定化電源装置の回路構成において、入力の電
源が電池である場合、以下のような問題があった。一般
に電池には、それ以下の電圧になると急激に特性が劣化
する放電終止電圧がある。従って、入力電源としての電
池が放電終止電圧を割るような場合には回路にリセット
がかかることが望ましい。By the way, in the circuit configuration of the above-mentioned conventional DC stabilized power supply device, when the input power supply is a battery, there are the following problems. Generally, a battery has a discharge end voltage whose characteristics are rapidly deteriorated at a voltage lower than that. Therefore, it is desirable to reset the circuit when the battery as the input power source falls below the discharge end voltage.
【０００８】ところが、実際は、例えば１セル当たり
１.２Ｖのニッカド電池（放電終止電圧は１.０Ｖ）を６
ケ使用した場合、入力電圧Ｖinが７.２Ｖ、放電終止電
圧が６.０Ｖであるのに対して、リセット検出電圧は出
力電圧ＶOを５.０Ｖとする時に通常４.７５Ｖと固定的
に設定される。However, in practice, for example, it is possible to install a 1.2 volt NiCd battery (with a discharge end voltage of 1.0 V) per cell.
When used, the input voltage Vin is 7.2V and the discharge end voltage is 6.0V, whereas the reset detection voltage is fixed at 4.75V normally when the output voltage V O is 5.0V. Is set.
【０００９】つまり、リセットがかかる時の電池の電圧
は、放電終止電圧である６.０Ｖを割ることになり、過
放電によって電池の寿命が著しく短くなってしまう。That is, the voltage of the battery at the time of resetting falls below the discharge end voltage of 6.0 V, and the battery life is shortened remarkably due to overdischarge.
【００１０】図４はこの状態を示す、入力電圧−リセッ
ト信号波形図である。立ち上がった入力電圧Ｖin1の電
圧が低下する際、電池放電終止電圧（６Ｖ）のａ点でリ
セットがかかるのが望ましいが、リセット検出電圧は
４.７５Ｖで固定されているので、実際にリセットがか
かるのはｂ点となる。FIG. 4 is an input voltage-reset signal waveform diagram showing this state. When the voltage of the rising input voltage Vin 1 drops, it is desirable to reset at the point a of the battery discharge end voltage (6V), but since the reset detection voltage is fixed at 4.75V, it is actually reset. This is point b.
【００１１】従って、前述のようにリセット動作に至る
過程で電池は放電終止電圧を割ってしまい、特性が非常
に劣化する。Therefore, in the process of reaching the reset operation as described above, the battery breaks down the discharge end voltage, and the characteristics are greatly deteriorated.
【００１２】そこで、本発明の目的は、リセット検出電
圧の大きさを回路構成に応じて任意に設定でき、入力電
源として電池を使用した場合でも電池の著しい特性劣化
を招くことのない直流安定化電源装置を実現することに
ある。Therefore, an object of the present invention is to set the magnitude of the reset detection voltage arbitrarily according to the circuit configuration, and to stabilize the direct current without causing significant deterioration of the characteristics of the battery even when the battery is used as the input power source. It is to realize a power supply device.
【００１３】[0013]
【課題を解決するための手段】前記目的を達成するため
に本発明は、電池を入力電源とするリセット機能付の直
流安定化電源装置において、入力電源部に対して外部接
続される複数の抵抗からなる外付け抵抗部と、該外付け
抵抗部の分圧と基準電圧とを比較しリセット状態を検出
するコンパレータを含むリセット信号出力部と、を有し
てなることを特徴とする。In order to achieve the above object, the present invention relates to a DC stabilized power supply device with a reset function, which uses a battery as an input power supply, and a plurality of resistors externally connected to the input power supply unit. And a reset signal output unit including a comparator for detecting a reset state by comparing the divided voltage of the external resistor unit with a reference voltage.
【００１４】[0014]
【作用】本発明の直流安定化電源装置は、前述のように
入力電源部に対して外部接続される複数の抵抗からなる
外付け抵抗部と、該外付け抵抗部の分圧と基準電圧とを
比較しリセット状態を検出する構成であるので、リセッ
ト検出の電圧レベルを外付け抵抗部によって任意に設定
できる。つまり、リセット検出の電圧レベルを電池の放
電終止電圧と同一に（あるいは若干高めに）設定でき
る。As described above, the DC stabilized power supply device of the present invention includes an external resistance portion composed of a plurality of resistors externally connected to the input power supply portion, a voltage division of the external resistance portion, and a reference voltage. The reset detection voltage level can be arbitrarily set by the external resistor section. That is, the reset detection voltage level can be set to be the same as (or slightly higher than) the discharge end voltage of the battery.
【００１５】従って、従来は入力電源として電池を使用
する際、リセット検出電圧が電池の放電終止電圧よりも
低いレベルで一定に固定されていたために、リセット動
作に至る過程で電池特性が急激に劣化するという問題が
あったが、本発明によれば、放電終止電圧になった時
（あるいは放電終止電圧に至るまでに）リセットをかけ
ることができるので、上記問題点を解消でき、高信頼性
の直流安定化電源装置を実現できる。Therefore, conventionally, when the battery is used as the input power source, the reset detection voltage is fixed at a level lower than the discharge end voltage of the battery, so that the battery characteristics are rapidly deteriorated in the process of the reset operation. However, according to the present invention, since the reset can be applied when the discharge cutoff voltage is reached (or before the discharge cutoff voltage is reached), the above problems can be solved and high reliability can be achieved. A stabilized DC power supply can be realized.
【００１６】[0016]
【実施例】本発明の一実施例について、図１を参照して
説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
【００１７】図１は本実施例による直流安定化電源装置
の回路図である。なお、図３に示す従来例と同一機能部
分には同一記号を付している。ここでは、主に図３の従
来例と異なる点について説明する。FIG. 1 is a circuit diagram of a DC stabilized power supply device according to this embodiment. The same functional parts as those of the conventional example shown in FIG. Here, the difference from the conventional example of FIG. 3 will be mainly described.
【００１８】図１に示すように、本実施例による安定化
電源回路においては、コンパレータＣ1のＶref2との比
較電圧の入力端子Ｖradjに、Ｖin−ＶGND間に対する外付
け抵抗部１０（抵抗Ｒ10及びＲ11)の分圧を入力してい
る。つまり、リセット検出電圧は、外付け抵抗部１０の
抵抗Ｒ10及び抵抗Ｒ11の大きさを変えることによって任
意に調整できる。As shown in FIG. 1, in the stabilized power supply circuit according to the present embodiment, an external resistance portion 10 (resistor between the Vin and V GND is connected to the input terminal Vradj for the comparison voltage of the comparator C 1 with Vref 2). We are entering the partial pressure of R 10 and R 11). That is, the reset detection voltage can be arbitrarily adjusted by changing the sizes of the resistors R 10 and R 11 of the external resistor unit 10.
【００１９】従って、入力電源として電池を使用する場
合に、リセット検出電圧を電池の放電終止電圧と同一に
（あるいは放電終止電圧よりも若干高く）設定すること
により、放電終止電圧になった時（あるいは放電終止電
圧に至るまでに）リセットをかけることができるので、
電池の入力電圧が放電終止電圧よりも低下することを避
けられ、従来のように電池の入力電圧が放電終止電圧を
割って電池特性が急激に劣化するといった事態を防止で
きる。Therefore, when a battery is used as the input power source, when the reset detection voltage is set to be equal to (or slightly higher than) the discharge end voltage of the battery, when the discharge end voltage is reached ( Or reset can be applied until the discharge end voltage is reached.
It is possible to prevent the input voltage of the battery from becoming lower than the end-of-discharge voltage, and it is possible to prevent a situation where the input voltage of the battery falls below the end-of-discharge voltage and the battery characteristics are rapidly deteriorated as in the conventional case.
【００２０】図２は、この状態を示す入力電圧−リセッ
ト信号波形図である。図２に示すように、立ち上がった
入力電圧Ｖin1の電圧が低下する際、電池放電終止電圧
（６Ｖ）のａ点でリセットがかかるので、従来のよう
に、リセット時において電池電圧が放電終止電圧を割
り、電池の特性劣化が生じるという事はなく、高信頼性
の安定化電源回路を実現できる。FIG. 2 is an input voltage-reset signal waveform diagram showing this state. As shown in FIG. 2, when the voltage of the input voltage Vin 1 that has risen decreases, resetting is performed at point a of the battery discharge end voltage (6 V). It is possible to realize a highly reliable stabilized power supply circuit without causing deterioration of battery characteristics.
【００２１】[0021]
【発明の効果】以上説明したように本発明によれば、入
力電源として電池を使用する際、リセット検出電圧が電
池の放電終止電圧よりも低いために、リセット時に電池
特性が急激に劣化するということのない高信頼性の安定
化電源回路を実現できる。As described above, according to the present invention, when a battery is used as an input power source, the reset detection voltage is lower than the discharge end voltage of the battery, so that the battery characteristics are rapidly deteriorated at the time of reset. It is possible to realize a highly reliable stabilized power supply circuit.
【図１】本発明の一実施例による直流安定化電源装置の
回路図である。FIG. 1 is a circuit diagram of a stabilized DC power supply device according to an embodiment of the present invention.
【図２】図１の回路における入力電圧−リセット信号波
形図である。FIG. 2 is an input voltage-reset signal waveform diagram in the circuit of FIG.
【図３】従来例による直流安定化電源装置の回路図であ
る。FIG. 3 is a circuit diagram of a DC stabilized power supply device according to a conventional example.
【図４】図３の回路における入力電圧−リセット信号波
形図である。FIG. 4 is an input voltage-reset signal waveform diagram in the circuit of FIG.
１ リセット信号出力部 １０ 外付け抵抗部 Ｖin 入力電源部 Ｃ1 コンパレータ1 Reset signal output part 10 External resistor part V in Input power supply part C 1 Comparator
Claims (1)
流安定化電源装置において、 入力電源部に対して外部接続される複数の抵抗からなる
外付け抵抗部と、該外付け抵抗部の分圧と基準電圧とを
比較しリセット状態を検出するコンパレータを含むリセ
ット信号出力部と、を有してなることを特徴とする直流
安定化電源装置。1. A stabilized direct current power supply device with a reset function, which uses a battery as an input power source, comprising an external resistor portion composed of a plurality of resistors externally connected to the input power source portion, and a portion of the external resistor portion. A stabilized DC power supply device, comprising: a reset signal output unit including a comparator that compares a voltage and a reference voltage to detect a reset state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02517493A JP3148443B2 (en) | 1993-02-15 | 1993-02-15 | DC stabilized power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02517493A JP3148443B2 (en) | 1993-02-15 | 1993-02-15 | DC stabilized power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06242845A true JPH06242845A (en) | 1994-09-02 |
| JP3148443B2 JP3148443B2 (en) | 2001-03-19 |
Family
ID=12158650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02517493A Expired - Fee Related JP3148443B2 (en) | 1993-02-15 | 1993-02-15 | DC stabilized power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3148443B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7512821B2 (en) | 2002-10-02 | 2009-03-31 | Ricoh Company, Ltd. | Power supply system and method for supplying power to CPU providing power saving mode |
| JP2010160720A (en) * | 2009-01-09 | 2010-07-22 | Denso Corp | Power supply circuit device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3119216U (en) | 2005-12-02 | 2006-02-16 | 株式会社ビジョンメガネ | Eyeglass case with stand function |
-
1993
- 1993-02-15 JP JP02517493A patent/JP3148443B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7512821B2 (en) | 2002-10-02 | 2009-03-31 | Ricoh Company, Ltd. | Power supply system and method for supplying power to CPU providing power saving mode |
| JP2010160720A (en) * | 2009-01-09 | 2010-07-22 | Denso Corp | Power supply circuit device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3148443B2 (en) | 2001-03-19 |
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