JPH05336655A - Power supply control circuit - Google Patents
Power supply control circuitInfo
- Publication number
- JPH05336655A JPH05336655A JP4138126A JP13812692A JPH05336655A JP H05336655 A JPH05336655 A JP H05336655A JP 4138126 A JP4138126 A JP 4138126A JP 13812692 A JP13812692 A JP 13812692A JP H05336655 A JPH05336655 A JP H05336655A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- power
- battery
- circuit
- turned
- 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
- Control Of Electrical Variables (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はポータブルターミナルに
供給する電源を制御する電源制御回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control circuit for controlling a power supply supplied to a portable terminal.
【0002】[0002]
【従来の技術】従来の電源制御回路は、ポータブルター
ミナルの回路部への電源供給を制御するスイッチング素
子(Tr,FET等)とそのスイッチング素子を制御す
る制御用LSI,及び制御用LSI各動作の基準となる
基準電圧生成部とから構成されている。また、電源とし
て電池を使用する為、電池消耗時の電圧低下時のポータ
ブルターミナル0回路部の誤動作を回避する目的で制御
用LSIには、電池電圧低下時の電源供給禁止機能,動
作時に電池電圧が低下した場合のソフトウェアによる電
池電圧監視信号としての電源アラーム信号生成機能が装
備されている。2. Description of the Related Art A conventional power supply control circuit includes a switching element (Tr, FET, etc.) for controlling power supply to a circuit portion of a portable terminal, a control LSI for controlling the switching element, and a control LSI for each operation. It is composed of a reference voltage generation unit serving as a reference. Also, since the battery is used as the power source, the control LSI has a power supply prohibition function when the battery voltage drops, and a battery voltage when the battery voltage drops, for the purpose of avoiding malfunction of the portable terminal 0 circuit part when the voltage drops when the battery is exhausted. It is equipped with a function to generate a power supply alarm signal as a battery voltage monitoring signal by software when the voltage drops.
【0003】図2は従来の電源制御回路の一例のブロッ
ク図である。従来例において、11はNi−Cd電池、
12は基準電圧生成IC、13は電源制御LSI、14
は電源SW、15は13内部の電源ON/OFF制御ブ
ロック、16は13内部の電源アラーム生成ブロック、
17は電源スイッチングトランジスタ、18はポータブ
ルターミナル論理回路部、19はLCDパネル部であ
る。18及び19などポータブルターミナルの各ユニッ
トデバイスへの11からの電源の供給は13のLSIに
よって制御されている。13は12の基準電圧生成IC
の生成する基準電圧をベースにして全ての電源制御を実
行する。14の電源SWがONされると、その際のLO
Wレベルパルス信号が13に入力され、13は17のト
ランジスタをONさせて18および19へ11からの電
源を供給する。13内部の15のブロック部は、その際
17のコレクタ出力電圧(18,19への供給電圧)を
12からの基準電圧をベースに監視し、コレクタ電圧値
がある電圧レベル以下の場合は、18および19の低電
圧時の異常動作を避ける為17のトランジスタをOFF
させて電源供給を停止させる。即ち11の電池電圧レベ
ルがある電圧レベル以下の場合は、ポータブルターミナ
ル本体の電源が入らない様に制御されることになる。ま
た13内部の16のブロック部は14のSW ONによ
り18および19に電源が供給された後、11の電池が
消耗して電圧レベルが下がってきた場合、12の発生す
る基準電圧をベースに17のコレクタ出力電圧を監視し
てある電圧レベル以下になると電源アラーム信号を発生
する機能を有する。発生する電源アラーム信号は、その
監視電圧レベルの段階に応じて何種類か容易されてい
る。(図2ではALM1とALM2の2種類を記載)本
アラーム信号をソフトウェアにて監視し、アラーム信号
発生電圧レベル毎に本体Logic回路系の動作を制限
もしくは動作を中止させることにより、低電源電圧レベ
ル時の本体Logic回路系の誤動作を未然防止するこ
とが可能となっている。FIG. 2 is a block diagram of an example of a conventional power supply control circuit. In the conventional example, 11 is a Ni-Cd battery,
12 is a reference voltage generation IC, 13 is a power supply control LSI, 14
Is a power switch, 15 is a power ON / OFF control block inside 13, 16 is a power alarm generation block inside 13,
Reference numeral 17 is a power supply switching transistor, 18 is a portable terminal logic circuit section, and 19 is an LCD panel section. Supply of power from 11 to each unit device of the portable terminal such as 18 and 19 is controlled by 13 LSIs. 13 is a reference voltage generation IC of 12.
All power supply control is executed based on the reference voltage generated by. When the power supply SW of 14 is turned on, LO at that time
The W level pulse signal is input to 13, and 13 turns on the transistor 17 and supplies the power from 11 to 18 and 19. At that time, 15 block parts inside 13 monitor the collector output voltage of 17 (supply voltage to 18, 19) on the basis of the reference voltage from 12, and when the collector voltage value is below a certain voltage level, Turn off the 17th transistor to avoid abnormal operation of 19th and 19th low voltage
To stop the power supply. That is, when the battery voltage level of 11 is below a certain voltage level, the portable terminal body is controlled so as not to be turned on. In addition, 16 blocks in 13 are powered by SW ON 14 to supply power to 18 and 19, and then when the battery of 11 is exhausted and the voltage level is lowered, 17 blocks based on the reference voltage of 12 are generated. It has a function of generating a power supply alarm signal when the collector output voltage of is monitored below a certain voltage level. There are several types of generated power supply alarm signals depending on the level of the monitored voltage level. (In Fig. 2, two types, ALM1 and ALM2, are shown.) This alarm signal is monitored by software, and the low power supply voltage level is set by limiting or stopping the operation of the main body logic circuit system for each alarm signal generation voltage level. It is possible to prevent the malfunction of the main body Logic circuit system at that time.
【0004】このように従来例では、12の基準電圧生
成ICが11の電池電源に直接接続されている為ポータ
ブルターミナル本体が電源OFF状態でも常時12にて
電流が消費され電池11の消耗を早めてしまう。As described above, in the conventional example, since the 12 reference voltage generating ICs are directly connected to the battery power source of 11, the current is constantly consumed at 12 even when the portable terminal main body is in a power-off state, and the consumption of the battery 11 is accelerated. Will end up.
【0005】[0005]
【発明が解決しようとする課題】この従来の電源制御回
路では、制御用LSIの動作ベースとなる基準電圧生成
部において電池電源が接続状態の時は常時電流が消費さ
れている為本体の電源がOFF状態でも電池が常時消耗
され、本体の実運用時間が短縮されてしまうという問題
がある。In this conventional power supply control circuit, the current is constantly consumed when the battery power supply is connected in the reference voltage generation section which is the operation base of the control LSI, so that the power supply of the main body is Even in the OFF state, the battery is always exhausted and the actual operation time of the main body is shortened.
【0006】[0006]
【課題を解決するための手段】本発明の電源制御回路
は、電池により動作するポータブルターミナルの電源制
御回路において、制御用の基準電圧生成回路に対し前記
電池からの電源を前記ポータブルターミナルの電源スイ
ッチにより供給する電源供給回路とを有し、前記電源供
給回路を低消費電力型のデバイスで構成することを特徴
とする。The power supply control circuit of the present invention is a power supply control circuit for a portable terminal which operates on a battery, wherein a power supply from the battery is supplied to a reference voltage generation circuit for control. And a power supply circuit which supplies the power source according to the present invention, and the power supply circuit is configured by a low power consumption type device.
【0007】[0007]
【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ブロック図である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention.
【0008】本実施例において、21はNi−Cdの電
池、22は電源スイッチ(SW)、23はラッチ回路、
24はバッファIC、25は基準電圧生成IC、26は
電源制御LSI、27は電源制御部、28は電源アラー
ム生成ブロック、29は電源スイッチング用のトランジ
スタ、30はポータブルターミナルの論理回路、31は
LCDパネルである。In this embodiment, 21 is a Ni-Cd battery, 22 is a power switch (SW), 23 is a latch circuit,
Reference numeral 24 is a buffer IC, 25 is a reference voltage generation IC, 26 is a power supply control LSI, 27 is a power supply control unit, 28 is a power supply alarm generation block, 29 is a power supply switching transistor, 30 is a portable terminal logic circuit, and 31 is an LCD. It is a panel.
【0009】電源SW22がONされると電源制御LS
I26によりトランジスタ29がONとなり論理回路3
0及びLCDパネル部31に電源が供給される。電池2
1の電源電圧レベルが低い場合の本体ロジック(Log
ic)回路部等30,31の誤動作保護の為の電源制御
部27の制御による電源ON禁止機能,及び本体動作中
に電池21の電池消耗によりトランジスタ29コレクタ
出力電圧が低下してきた場合の本体Logic回路部等
30,31の誤動作保護の為のアラーム生成部28の制
御による電源アラーム信号生成機能の一連の各部の動作
は上述した従来の電源制御回路と同等である。When the power source SW22 is turned on, the power source control LS
Transistor 29 is turned on by I26 and logic circuit 3
0 and the LCD panel unit 31 are supplied with power. Battery 2
1 logic when the power supply voltage level of 1 is low (Log
ic) A power-on prohibiting function under the control of the power supply control unit 27 for protecting the malfunction of the circuit units 30 and 31, and a main body Logic when the output voltage of the collector of the transistor 29 decreases due to the exhaustion of the battery 21 during the main body operation. The operation of each part of the series of power supply alarm signal generation functions under the control of the alarm generation part 28 for protecting the malfunction of the circuit parts 30 and 31 is the same as that of the conventional power supply control circuit described above.
【0010】本実施例の基準電圧生成ICへの電源供給
の方法では、電源SW22がONされた場合、そのON
信号は電源制御LSI26に入力されて本体電源制御起
動のトリガ信号となるが同時にON信号はラッチ回路2
3に入力される。ラッチ回路23は電源SW22がON
されてから次にOFFさせられるまでの間ON信号をラ
ッチしてHIGHレベルの信号を継続出力する機能を有
する。ラッチ回路23から出力されたHIGHレベルの
信号はバッファIC24に入力され基準電圧生成IC2
5はラッチ回路23のHIGHレベル信号が出力される
間、基準電圧生成IC25に電源を供給する。According to the method for supplying power to the reference voltage generating IC of this embodiment, when the power SW 22 is turned on, it is turned on.
The signal is input to the power supply control LSI 26 and becomes a trigger signal for starting the main body power supply control, but at the same time, the ON signal is the latch circuit 2.
Input to 3. The power supply SW22 of the latch circuit 23 is ON
It has a function of latching the ON signal and continuously outputting the HIGH level signal from the time it is turned on until the time it is turned off next time. The HIGH level signal output from the latch circuit 23 is input to the buffer IC 24 and is input to the reference voltage generation IC 2
5 supplies power to the reference voltage generation IC 25 while the HIGH level signal of the latch circuit 23 is output.
【0011】このようにすると、電源SW22がONさ
れてポータブルターミナル本体の電源がON状態にある
場合のみ基準電圧生成IC25に電源が供給されるの
で、従来例の問題点であった基準電圧生成IC25で常
時電流が消費されることがなくなる。また、論理回路3
0及び電源制御LSI26は内部構成がC−MOSデバ
イス構成となっている為、非動作時(ポータブルターミ
ナル本体電源OFF状態)の消費電流はμAオーダで非
常に小さいので、電池を電源とするポータブルターミナ
ルにおいてその実運用時間を長くすることができる。In this way, the reference voltage generation IC 25 is supplied only when the power supply SW22 is turned on and the portable terminal main body is in the power-on state, so the reference voltage generation IC 25, which has been a problem in the conventional example. Therefore, the current is not always consumed. Also, the logic circuit 3
0 and the power supply control LSI 26 have a C-MOS device internal structure, the current consumption when not in operation (portable terminal main body power OFF state) is very small on the order of μA. Therefore, a portable terminal powered by a battery is used. In, the actual operation time can be lengthened.
【0012】[0012]
【発明の効果】以上説明したように本発明は、電源制御
回路において常時電流を消費していた基準電圧生成回路
部では、ポータブルターミナル本体の電源ON時のみ電
池電源を供給することにより、本体電源OFF時の消費
電流が極めて小さいものとなり、電源である電池の負荷
が減少し、本体の実運用時間が延長されるという効果を
有する。As described above, according to the present invention, in the reference voltage generating circuit section which constantly consumes current in the power supply control circuit, the battery power is supplied only when the power supply of the portable terminal main body is turned on. The current consumption when turned off is extremely small, the load of the battery as the power source is reduced, and the actual operation time of the main body is extended.
【図1】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図2】従来の電源制御回路の一例のブロック図であ
る。FIG. 2 is a block diagram of an example of a conventional power supply control circuit.
21 電池 22 電源SW 23 ラッチ回路 24 バッファIC 25 基準電圧生成IC 26 電源制御LSI 27 電源制御部 28 電源アラーム生成部 29 トランジスタ 30 論理回路部 31 LCDパネル 21 battery 22 power supply SW 23 latch circuit 24 buffer IC 25 reference voltage generation IC 26 power supply control LSI 27 power supply control unit 28 power supply alarm generation unit 29 transistor 30 logic circuit unit 31 LCD panel
Claims (1)
ルの電源制御回路において、制御用の基準電圧生成回路
に対し前記電池からの電源を前記ポータブルターミナル
の電源スイッチにより供給する電源供給回路とを有し、
前記電源供給回路を低消費電力型のデバイスで構成する
ことを特徴とする電源制御回路。1. A power supply control circuit for a portable terminal operated by a battery, comprising a power supply circuit for supplying power from the battery to a control reference voltage generation circuit by a power switch of the portable terminal,
A power supply control circuit comprising the power supply circuit as a low power consumption device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4138126A JP3061943B2 (en) | 1992-05-29 | 1992-05-29 | Power control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4138126A JP3061943B2 (en) | 1992-05-29 | 1992-05-29 | Power control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05336655A true JPH05336655A (en) | 1993-12-17 |
JP3061943B2 JP3061943B2 (en) | 2000-07-10 |
Family
ID=15214586
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4138126A Expired - Fee Related JP3061943B2 (en) | 1992-05-29 | 1992-05-29 | Power control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3061943B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6711719B2 (en) * | 2001-08-13 | 2004-03-23 | International Business Machines Corporation | Method and apparatus for reducing power consumption in VLSI circuit designs |
CN112260337A (en) * | 2020-09-23 | 2021-01-22 | 中国电子科技集团公司第五十二研究所 | Low-power-consumption control circuit of lithium battery |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102207742B (en) * | 2010-03-30 | 2014-01-15 | 鸿富锦精密工业(深圳)有限公司 | Voltage control device |
-
1992
- 1992-05-29 JP JP4138126A patent/JP3061943B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6711719B2 (en) * | 2001-08-13 | 2004-03-23 | International Business Machines Corporation | Method and apparatus for reducing power consumption in VLSI circuit designs |
CN112260337A (en) * | 2020-09-23 | 2021-01-22 | 中国电子科技集团公司第五十二研究所 | Low-power-consumption control circuit of lithium battery |
CN112260337B (en) * | 2020-09-23 | 2022-07-12 | 中国电子科技集团公司第五十二研究所 | Low-power-consumption control circuit of lithium battery |
Also Published As
Publication number | Publication date |
---|---|
JP3061943B2 (en) | 2000-07-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000404 |
|
LAPS | Cancellation because of no payment of annual fees |