JPS5922113A - Power source voltage detecting circuit - Google Patents
Power source voltage detecting circuitInfo
- Publication number
- JPS5922113A JPS5922113A JP57131373A JP13137382A JPS5922113A JP S5922113 A JPS5922113 A JP S5922113A JP 57131373 A JP57131373 A JP 57131373A JP 13137382 A JP13137382 A JP 13137382A JP S5922113 A JPS5922113 A JP S5922113A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output
- circuit
- power supply
- supply voltage
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Protection Of Static Devices (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
【発明の詳細な説明】
何）技術分野
本発明は、電源電圧の検知回路に係り、特に、ポータプ
ルＶＴＲ等のように電源として電池を使用する機器にお
いて、電池の消耗を検知する同回路に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a power supply voltage detection circuit, and more particularly to a circuit for detecting battery consumption in devices that use batteries as a power source, such as portable VTRs.
（ロ）従来技術
一般に、電源として電池を使用する機器においては、電
池が消耗すると正常な動作ができないため、電池の消耗
を検知し、これを使用者に知らせると共に電源電圧を遮
断し動作を停止させなければならない。ところが、例え
ば、ポータプルＶＴＲ等においては、録画している際中
に、電池の消耗を検知したとき即座に電源電圧を遮断し
たのでは、テープがヘッドに巻きついたままで停止して
しまうため、電池の消耗を検知した後所定時間が経過し
てから電源電圧を遮断し、その所定時間内にＶＴＲをス
トップモードとしアンローディング状態として、テープ
がヘラ＋゛に巻きついたまま停止してしまうのを防ぐ必
要がある、
従来、上述の如き所定時間を得るために、電池の消耗を
検知した検知信号を遅延させるコンデンサ及び抵抗より
成る遅延回路を用いていた。従って、この検知回路をＩ
Ｃ化する場合には、遅延用の外付はコンデンサが必要で
あり、このコンデンサを外付けするためのビンも必要で
あった。又、通常、電源電圧の検知回路においては、入
力される電源電圧を平滑保持するための平滑保持回路が
必要であり、このため、ＩＣ化する場合には、平滑保持
用コンデンサをも外付けしなければならなかった。(b) Prior art Generally, devices that use batteries as a power source cannot operate normally when the battery is exhausted, so they detect the battery exhaustion, notify the user of this, and cut off the power supply voltage to stop the operation. I have to let it happen. However, for example, in portable VTRs, if the power supply voltage is immediately cut off when the battery is detected to be low during recording, the tape will remain wrapped around the head and the battery will stop. After a predetermined time has elapsed after detecting the consumption of the tape, the power supply voltage is cut off, and within that predetermined time, the VTR is placed in stop mode and unloaded to prevent the tape from stopping while being wrapped around the spatula. Conventionally, in order to obtain the above-mentioned predetermined time, a delay circuit consisting of a capacitor and a resistor has been used to delay a detection signal that detects battery exhaustion. Therefore, this detection circuit is
When converting to C, an external delay capacitor was required, and a bin was also required for externally attaching this capacitor. In addition, normally, a power supply voltage detection circuit requires a smoothing circuit to keep the input power supply voltage smooth, so when implementing an IC, an external smoothing capacitor is also required. I had to.
（ハ）従来技術の欠点
従来技術では、遅延回路としての充放電回路と平滑保持
回路としての充放電回路が別々に設けられていたため、
遅延用コンデンサと平滑保持用コンデンサが外付はコン
デンサとして必要であり、しかも、このため、ピン数が
増加するという欠点があった、に）発明の目的
本発明は、遅延用コンデンサと平滑保持用コンデンサと
を兼用することにより、外付はコンデンサを減らした新
規な電源電圧検知回路を提供するものである。(c) Disadvantages of the conventional technology In the conventional technology, the charging/discharging circuit as a delay circuit and the charging/discharging circuit as a smoothing holding circuit were provided separately.
The delay capacitor and the smoothing capacitor are required as external capacitors, and this has the disadvantage of increasing the number of pins.Purpose of the InventionThe present invention provides a delay capacitor and a smoothing capacitor. By using it as a capacitor, a new power supply voltage detection circuit with fewer external capacitors is provided.
（ホ）実施例
第１図は、電源として電池を使用したポータプルＶＴＲ
に本発明を適用した場合の一実施例を示すブロック図で
あり、（１）は電源電圧札の１１時の電圧降下に対して
出力電圧Ｗが急激に変化しないようにし、且つ、電源電
圧に含まれるノイズの影響をな（すため、電源電圧Ｅ。(E) Embodiment Figure 1 shows a portable VTR that uses a battery as a power source.
FIG. 2 is a block diagram showing an embodiment in which the present invention is applied to a power supply voltage tag, and (1) is a block diagram in which the output voltage W is prevented from changing suddenly in response to a voltage drop at 11 o'clock on a power supply voltage tag, and the power supply voltage is In order to eliminate the influence of included noise, the power supply voltage E.
を平滑保持する平滑保持回路であり、電源電圧Ｅ。を一
方の端子に入力する差動増幅器（２）と、逆流防止用の
ダイオード（３）と、抵抗（４）及びコンデンサ（５）
から成る充放電回路（６）とより構成され、充放電回路
（６）の出力電圧騙は差動増幅器（２）の他方の端子に
帰還されている。又、（力（８）（９）（１０）は、定
電圧Ｖｒ を抵抗（１，＋１（＋ ２１（Ｊ ３１によ
り抵抗分割して得られる基準電圧Ｖ４、Ｖ２、Ｖ３を各
々一方の端子に入力し、他方の端子に充放電回路（６）
の出力電圧■。を入力する比較器、０４）は充放電回路
（６）の出力に抵抗０５）を介して接続され、比較器（
９）の出力Ｃ２に応じて充放電回路（６）のコンデンサ
（５）の電荷を放電させるためのスイッチングトランジ
スタ、０６）は差動増幅器（２）とダイオード（３）と
の間に接続され、比較器（９）の出力Ｃ２に応じて充放
電回路（６）への入力電圧を遮断するスイッチングトラ
ンジスタ、（１７）は基準電圧ＶＴ と電源′亀圧几を
比較する復起用比較器、０町ま復起用比較器ａ′７）の
出力ＣＴ に応じてスイッチングトランジスタ０４）及
び（１６）を制御するスイッチングトランジスタ、更に
、０９（２０）（２＋＋は電源電圧の降下状態即ち電池
の消耗状態を指示するための表示素子、（２２）（２３
）（２４）は比較器（７）（８）（９１の出力Ｃ，Ｃ，
、Ｃ７に応じて各々表示素子（１！Ｉｔ（２０ｊｆ３＋
１を駆動する表示駆動回路、（２５）は比較器（９）の
出力Ｃ２に応じてＶＴＲをストップモードとしアンロー
ディング状態にするテープローディング駆動回路、（２
６）はリレー等により構成され比較器００）の出力Ｃ１
に応じて電源電圧を遮断する電源電圧遮断回路である１
、尚 基準電圧は、■〉ＶＴ） Ｖ２） Ｖ、に設定さ
れている。This is a smoothing circuit that maintains the power supply voltage E. A differential amplifier (2) that inputs the signal into one terminal, a diode (3) for backflow prevention, a resistor (4), and a capacitor (5)
The output voltage of the charging/discharging circuit (6) is fed back to the other terminal of the differential amplifier (2). In addition, (forces (8), (9), and (10)) are obtained by dividing the constant voltage Vr by the resistance (1, +1 (+21 input, and connect the charging/discharging circuit (6) to the other terminal.
■ Output voltage. A comparator (04) that inputs is connected to the output of the charge/discharge circuit (6) via a resistor (05),
A switching transistor 06) for discharging the charge of the capacitor (5) of the charging/discharging circuit (6) according to the output C2 of 9) is connected between the differential amplifier (2) and the diode (3), A switching transistor cuts off the input voltage to the charging/discharging circuit (6) according to the output C2 of the comparator (9), and (17) is a recovery comparator that compares the reference voltage VT and the power supply voltage. A switching transistor controls switching transistors 04) and (16) according to the output CT of the recovery comparator a'7), and 09 (20) (2++) indicates a drop state of the power supply voltage, that is, a state of battery consumption. Display elements for (22) (23
) (24) are the outputs C, C,
, C7, each display element (1!It(20jf3+
(25) is a tape loading drive circuit which puts the VTR into a stop mode and an unloading state according to the output C2 of the comparator (9);
6) is composed of relays, etc., and the output C1 of the comparator 00)
1, which is a power supply voltage cutoff circuit that cuts off the power supply voltage according to the
, The reference voltage is set to ■〉VT) V2) V.
次に、本実施例の動作を第２図を参照しながら説明する
。Next, the operation of this embodiment will be explained with reference to FIG.
先ず、電池が消耗しておらず、電源型１圧＆が所定レベ
ル以上であるときは、光放電回路（６）の出力電圧■。First, when the battery is not exhausted and the power supply type 1 voltage & is above a predetermined level, the output voltage ■ of the photodischarge circuit (6).
も基準電圧７１以上あるので、比較器（力の出力Ｃ８の
みがｌ−Ｈｊレベルとなり、表示素子０１珍のみが点灯
し、表示素子（２Ｆｌ！及び（２１）は消灯しているー
ところが、電池が消耗し始め電、源電、圧Ｅ。が降下し
てくると、出力電圧Ｖ。も第２図（イ）に示すように徐
々に降下して行き、基準電圧■、より低くなってしまう
。すると、比較器（力の出力Ｃ６は「Ｌ」レベルとなり
（第２図（ロ））、比較器（８）の出力Ｃ１がＪ Ｉ−
（Ｊレベルとなるので（第２図（ハ））、表示素子０唱
ま消口し 代わって表示素子（イ）が点灯する。このよ
うに、表示素子（λ））の点灯により、電池が消耗した
ので雷。Since the reference voltage is higher than 71, only the comparator (force output C8 is at the l-Hj level, only the display element 01 is lit, and the display elements (2Fl! and (21) are off). However, the battery is When the power source, source power, and voltage E start to decrease, the output voltage V gradually decreases as shown in FIG. 2 (a), and becomes lower than the reference voltage (2). Then, the comparator (force output C6) becomes "L" level (Fig. 2 (b)), and the output C1 of the comparator (8) becomes J I-
(Since it becomes J level (Fig. 2 (c)), the display element (A) turns on instead of 0. In this way, by lighting the display element (λ)), the battery drains. Lightning because I was exhausted.
池の交換をすべきであることを使用者に指示するが、こ
の状態では未だ録画は可能である。The user is instructed that the pond should be replaced, but recording is still possible in this state.
ところが、使用者が電池を交換せず、そのまま録画し続
けると、出力電圧Ｖ。はさらに降下していき、録画が不
可能な電圧まで下がってしまう。しかしながら、本実施
例では、出力電圧■。かさらに降下し、基準電圧■２以
下になってしまうと、比較器（９）の出力Ｃ２が「ｌ（
」レベルとなるため（第２図に））、表示素子（２１）
が点灯すると共に、テープローディング駆動回路（ハ）
が起動され、ＶＴＲはストップモードになる。さらに、
比較器（９）の出力Ｃ７が「■（」レベルになると、ス
イッチングトランジスタα４）及び０６）はオンするの
で、充放電回路（６）への入力は遮断され、コンデンサ
（５）に蓄えられた電荷が抵抗０５）及び（４）とコン
デンサ（５）により定まる時定数に従って放電され始め
、出力電圧騙は第２図（イ）の如く降下して行く。ＶＴ
Ｒは比較器（９）の出力Ｃ７により既にストップモード
にされているため この放電期間内に、アンローディン
グ状態となりテープはケースに収納される。However, if the user continues to record without replacing the battery, the output voltage will drop to V. As the voltage continues to drop, the voltage drops to a point where recording is no longer possible. However, in this embodiment, the output voltage is ■. When the voltage drops further and becomes less than the reference voltage ■2, the output C2 of the comparator (9) becomes “l(
” level (see Figure 2)), the display element (21)
lights up and the tape loading drive circuit (c)
is activated, and the VTR enters stop mode. moreover,
When the output C7 of the comparator (9) reaches the "■ (" level), the switching transistors α4) and 06) are turned on, so the input to the charge/discharge circuit (6) is cut off and the voltage stored in the capacitor (5) is turned on. The charge begins to be discharged according to the time constant determined by the resistors 05) and (4) and the capacitor (5), and the output voltage drops as shown in FIG. 2(a). VT
Since R has already been placed in the stop mode by the output C7 of the comparator (9), it enters the unloading state during this discharge period and the tape is stored in the case.
そして、出力電圧■が基準電圧Ｖ２以下となった後、所
定時間（Ｔ期間）が経過すると、出力電圧ｖｏは基準電
圧〃以下となるため、比較器００）の出力Ｃ３がｒＨＪ
レベルとなり（第２図（ホ））、この出力Ｃ３により電
源電圧が遮断される。即ち、電源電圧が所定レベル以下
になると、先ずＶＴＲがストイブモードとされ、所定期
間後、電源電圧が遮断される。Then, after a predetermined period of time (T period) has elapsed after the output voltage ■ becomes equal to or less than the reference voltage V2, the output voltage vo becomes equal to or less than the reference voltage, so that the output C3 of the comparator 00) becomes rHJ
level (FIG. 2 (E)), and the power supply voltage is cut off by this output C3. That is, when the power supply voltage falls below a predetermined level, the VTR is first put into a stave mode, and after a predetermined period of time, the power supply voltage is cut off.
ところで、この後、使用者が新しい電池と交換したとし
ても、スイッチングトランジスタ０４）及び０６）がオ
ンしたままでは、電源電圧Ｅ。が正常なレベルに戻って
も、出力電圧翼としては電源電圧Ｅ。By the way, even if the user replaces the battery with a new one after this, if the switching transistors 04) and 06) remain on, the power supply voltage E. Even if the voltage returns to normal level, the power supply voltage E remains as the output voltage blade.
に応じた電圧が得られないので、本実施例では、電源電
圧Ｅ。が基準電圧■２より高い基準電圧ＶＴを超えたこ
とを検出する比較器（１７）及びスイッチングトランジ
スタＯＱを用いてスイッチングトランジスタ０４）及び
０６）を初期状態に復起させている、即ち、電源電圧Ｅ
。が基準電圧ＶＴ以上になると、比較器ａ′７）の出力
ＣＴはｒ Ｉ−Ｉ Ｊレベルになり、スイッチングトラ
ンジス２０秒はオンする。このため、スイッチングトラ
ンジスタ０４）及び０６）のベース電極は略接地電位と
なりオフする。従って、抵抗Ｑ５１を介しての放電路は
断たれ、ダイオード（３）を介して差動増幅器（２）の
出力が充放電回路（６）に入力されるようになり、出力
電圧篤として電源電圧Ｅ。に応じた電圧が得られるよう
に回路が復起する、
尚、平滑保持回路（１）としては、差動増幅器（２）を
必ずしも使用する必要はなく 電源電圧Ｅ。を直接ダイ
オード（３）に入力してもよい
（へ）効果
本発明による電源電圧検知回路は、上述の如（、平滑保
持用コンデンサと遅延用コンデンサを兼用できるような
構成としたので、外付はコンデンサ及びピン数を削減で
き、従って、ＩＣ化においては実用的価値は非常に高い
。Since a voltage corresponding to E cannot be obtained, in this embodiment, the power supply voltage E is used. The switching transistors 04) and 06) are restored to their initial states using the comparator (17) and the switching transistor OQ, which detects that the voltage exceeds the reference voltage VT which is higher than the reference voltage (2). E
. When becomes equal to or higher than the reference voltage VT, the output CT of the comparator a'7) becomes r I-I J level, and the switching transistor is turned on for 20 seconds. Therefore, the base electrodes of the switching transistors 04) and 06) become approximately at ground potential and are turned off. Therefore, the discharge path via the resistor Q51 is cut off, and the output of the differential amplifier (2) is input to the charge/discharge circuit (6) via the diode (3), and the output voltage is set to the power supply voltage. E. The circuit restarts to obtain a voltage corresponding to the power supply voltage E. Note that it is not necessary to use the differential amplifier (2) as the smoothing holding circuit (1). may be directly input to the diode (3).The power supply voltage detection circuit according to the present invention has a structure that can serve as both a smoothing capacitor and a delay capacitor as described above. can reduce the number of capacitors and pins, and therefore has very high practical value in IC implementation.
第１図は本発明による電源電圧検知回路の実施例を示す
ブロック図、第２図は本実施例の各部の波形を示す波形
図である、
主な図番の説明
（狙・・・平滑保持回路、 （２）・・・差動増幅器、
（３）・・・ダイオード、 （４）ａ（ト）・・・抵
抗、 （５）・・・コンデンサ、（６）・・・充放電回
路、 （力〜（１０）・・・比較器、 （１４１（１６
１（＋ ８＋・・・スイッチングトランジスタ、 ０７
）・・・復起用比較器、θ！Ｉｔ（２０） （２＋）・
・・表示素子、 （２５）・・・テープローディング駆
動回路、 し６）・・・電源電圧遮断回路。
−１
−１１′Fig. 1 is a block diagram showing an embodiment of the power supply voltage detection circuit according to the present invention, and Fig. 2 is a waveform diagram showing waveforms of each part of this embodiment. circuit, (2)...differential amplifier,
(3)...Diode, (4)a(g)...Resistor, (5)...Capacitor, (6)...Charge/discharge circuit, (Power~(10)...Comparator, (141 (16
1(+8+...Switching transistor, 07
)...Recovery comparator, θ! It(20) (2+)・
...display element, (25)...tape loading drive circuit, 6)...power supply voltage cutoff circuit. -1 -11'
Claims (1)
の出力段を構成する充放電回路と、第１及び第２の基準
電圧を各々一方の端子に入力し他方の端子に前記充放電
回路の出力を共通して入力する第１及び第２の比較器と
、該第１の比較器の出力に応じて前記充放電回路の電荷
を放電させる放電制御回路と、前記第１の比較器の出力
に応じて前記充放電回路への入力電圧を遮断する遮断回
路とを有し、前記第１の比較器より出力が発生した後、
所定時間経過後に前記第２の比較器より出力が得られる
ようにしたことを特徴とする電源電圧検知回路。(1) A charging/discharging circuit that constitutes the output stage of a smoothing circuit that maintains smoothness of the input power supply voltage, and a charging/discharging circuit that inputs the first and second reference voltages to one terminal and connects the other terminal to the charging/discharging circuit. a discharge control circuit that discharges the electric charge of the charging/discharging circuit according to the output of the first comparator; and a cutoff circuit that cuts off the input voltage to the charging/discharging circuit according to the output, and after the output is generated from the first comparator,
A power supply voltage detection circuit characterized in that an output is obtained from the second comparator after a predetermined period of time has elapsed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57131373A JPS5922113A (en) | 1982-07-27 | 1982-07-27 | Power source voltage detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57131373A JPS5922113A (en) | 1982-07-27 | 1982-07-27 | Power source voltage detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5922113A true JPS5922113A (en) | 1984-02-04 |
Family
ID=15056417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57131373A Pending JPS5922113A (en) | 1982-07-27 | 1982-07-27 | Power source voltage detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5922113A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8996100B2 (en) | 2002-03-29 | 2015-03-31 | Koninklijke Philips N.V. | Monitoring system comprising electrodes with projections |
-
1982
- 1982-07-27 JP JP57131373A patent/JPS5922113A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8996100B2 (en) | 2002-03-29 | 2015-03-31 | Koninklijke Philips N.V. | Monitoring system comprising electrodes with projections |
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