JPH01173211A - Backup circuit for power unit of memory - Google Patents

Backup circuit for power unit of memory

Info

Publication number
JPH01173211A
JPH01173211A JP62334662A JP33466287A JPH01173211A JP H01173211 A JPH01173211 A JP H01173211A JP 62334662 A JP62334662 A JP 62334662A JP 33466287 A JP33466287 A JP 33466287A JP H01173211 A JPH01173211 A JP H01173211A
Authority
JP
Japan
Prior art keywords
voltage
power supply
backup
diode
regulator
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
Application number
JP62334662A
Other languages
Japanese (ja)
Inventor
Koji Hirata
浩二 平田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba TEC Corp
Original Assignee
Tokyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Electric Co Ltd filed Critical Tokyo Electric Co Ltd
Priority to JP62334662A priority Critical patent/JPH01173211A/en
Publication of JPH01173211A publication Critical patent/JPH01173211A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To extend the backup time by providing a regulator and a diode between a backup power source and a memory and minimizing the backup voltage without reducing the capacity to suppress the discharge current. CONSTITUTION:When a power switch 12 is turned on, 6V voltage is generated from a power supply circuit 11 and is stabilized to about 5.3V by a three- terminal regulator 13 but the output is about 6V because of the existence of a diode 15 of about 0.7V forward voltage, and a cathode potential P1 of a diode 14 is 5.3V. The generated voltage of a battery 16 is stabilized to about 5V by a micro power regulator 17 and is outputted, and a cathode potential P2 of a Shottky diode 18 is about 4.6V. Consequently, about 5.3V of the potential P1 is supplied to a DRAM 1 because of P1>P2 and the storage operation is possible. When the switch 12 is turned off, P1<P2 is true and 4.6V of the potential P2 is supplied to a RAM 1, and the storage operation of the RAM 1 is held because this voltage is within the allowable range of the RAM 1.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、ダイナミックRAM (D−RAM)などの
電源バックアップを必要とするメモリの電源バックアッ
プ回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power backup circuit for a memory that requires power backup, such as a dynamic RAM (D-RAM).

[従来の技術] 従来のD−RAMの電源バックアップ回路を第3図に示
す。同図に示すようにD−RAM1の電源端子にダイオ
ード2および電源スイッチ3を介して電源回路4が接続
されるとともに、ダイオード5を介してバックアップ用
電源としてのバッテリ6が接続されている。そして、電
源電圧4からの発生電圧を約6ボルト、バッテリ6の発
生電圧を約5.5ボルトとしており、両ダイオード2お
よび5の順方向電圧降下は約0.7ボルトとなっている
。したがって、電源スィッチ3のON時にはダイオード
2のカソード電圧P1は約5.3ボルト、ダイオード5
のカソード電圧P2は約4.8ボルトとなるので、電源
回路側の電圧がD−RAM1に供給されてD−RAM1
の記憶動作が可能となる。これに対し、電源スィッチ3
がOFFするとダイオード5のカソード電圧P2の方が
ダイオード2のカソード電圧P1よりも高くなるので、
バッテリ側の電圧が[)−RAM1に供給されてD−R
AM1の記憶動作が維持される。
[Prior Art] A conventional D-RAM power backup circuit is shown in FIG. As shown in the figure, a power supply circuit 4 is connected to the power terminal of the D-RAM 1 through a diode 2 and a power switch 3, and a battery 6 as a backup power source is connected through a diode 5. The voltage generated from the power supply voltage 4 is approximately 6 volts, the voltage generated by the battery 6 is approximately 5.5 volts, and the forward voltage drop across both diodes 2 and 5 is approximately 0.7 volts. Therefore, when the power switch 3 is turned on, the cathode voltage P1 of the diode 2 is approximately 5.3 volts, and the diode 5
Since the cathode voltage P2 of is approximately 4.8 volts, the voltage on the power supply circuit side is supplied to D-RAM1 and
memory operations are possible. On the other hand, power switch 3
When OFF, the cathode voltage P2 of diode 5 becomes higher than the cathode voltage P1 of diode 2, so
The voltage on the battery side is supplied to [)-RAM1 and D-R
Memory operation of AM1 is maintained.

[発明が解決しようとする問題点] しかるに、上記従来の電源バックアップ回路においては
次のような問題があった。すなわち、D−RAM1の電
源電圧許容範囲は通常+5ボルト±10%(4,5〜5
.5ボルト)であり、バックアップ時には許容範囲の最
小値近傍でも十分である。それにもかかわらず、従来回
路においてはバックアップ電源電圧を約4.8ボルトす
なわち約+5ボルドー5%としていた。このため、従来
回路においては無駄な電圧供給を行なっていることにな
り、電源電圧が高いとD−RAM1の電源電流が多く流
れてバッテリ6の放電量が多くなるため、バックアップ
時間が短かった。バッテリ6の発生電圧を約5.2ボル
トとしてD−RAMIの電源電圧を許容範囲の最小値近
傍とすることによりバッテリ6の放電電流を抑制するこ
とは可能であるが、この場合はバッテリ6の容量が小さ
いのでバックアップ時間を延長できるものではない。
[Problems to be Solved by the Invention] However, the above conventional power supply backup circuit has the following problems. In other words, the allowable power supply voltage range for D-RAM1 is normally +5 volts ±10% (4,5 to 5
.. 5 volts), and even near the minimum value of the allowable range is sufficient during backup. Nevertheless, in conventional circuits, the backup power supply voltage was approximately 4.8 volts, or approximately +5 Bordeaux 5%. For this reason, in the conventional circuit, a wasteful voltage supply is performed, and when the power supply voltage is high, a large power supply current flows through the D-RAM 1, and the amount of discharge from the battery 6 increases, resulting in a short backup time. It is possible to suppress the discharge current of the battery 6 by setting the voltage generated by the battery 6 to approximately 5.2 volts and setting the power supply voltage of the D-RAMI to near the minimum value of the allowable range. Since the capacity is small, the backup time cannot be extended.

そこで本発明は、バックアップ用電源の容量を小さくす
ることなくメモリのバックアップ電源電圧を許容範囲の
最小値に近付けて放電電流を抑制し得、バックアップ時
間の延長をはかり得るメモリの電源バックアップ回路を
提供しようとするものである。
Therefore, the present invention provides a memory power supply backup circuit that can bring the memory backup power supply voltage close to the minimum value of the allowable range without reducing the capacity of the backup power supply, suppress the discharge current, and extend the backup time. This is what I am trying to do.

[問題点を解決するための手段] 本発明は、バックアップ用電源と、このバックアップ用
電源の正極に接続され電源電圧を所定範囲に安定化させ
るレギュレータと、このレギューレータの出力端子にア
ノードを接続しかつメモリの電源端子にカソードを接続
してなるダイオードとからなるメモリの電源バックアッ
プ回路である。
[Means for Solving the Problems] The present invention includes a backup power source, a regulator connected to the positive terminal of the backup power source to stabilize the power supply voltage within a predetermined range, and an anode connected to the output terminal of the regulator. This is a memory power backup circuit consisting of a diode whose cathode is connected to the memory power supply terminal.

[作用] このような手段を講じたメモリのバックアップ回路であ
れば、バックアップ用電源の発生電圧はレギュレータに
よって安定化され、このレギュレータの出力電圧がダイ
オードによる順方向電圧降下により低められてメモリの
電源端子に供給される。したがって、所要のレギュレー
タおよびダイオードを選択することによりバックアップ
電源の容量を小さくすることなくメモリへの電源バック
アップ電圧を許容範囲の最小値近傍とすることが可能で
ある。
[Function] In a memory backup circuit that takes such measures, the voltage generated by the backup power supply is stabilized by the regulator, and the output voltage of this regulator is lowered by the forward voltage drop caused by the diode, thereby increasing the memory power supply. Supplied to the terminal. Therefore, by selecting the required regulator and diode, it is possible to bring the power supply backup voltage to the memory close to the minimum value of the allowable range without reducing the capacity of the backup power supply.

[実施例] 以下、本発明のバックアップ回路をD−RAM1に適用
した一実施例を図面を参照しながら説明する。
[Embodiment] Hereinafter, an embodiment in which a backup circuit of the present invention is applied to a D-RAM 1 will be described with reference to the drawings.

第1図は本実施例の構成を示す回路図である。FIG. 1 is a circuit diagram showing the configuration of this embodiment.

同図に示すように、電源回路11の出力側に電源スィッ
チ12を介して3端子レギユレータ13が接続され、こ
のレギュレータ13の出力側にダイオード14のアノー
ドが接続され、ダイオード14のカソードにD−RAl
’lの電源端子が接続されている。そして、3端子レギ
ユレータ13のグラウンド端子にはダイオード14と同
等の順方向電圧降下を生じるダイオード15が介在され
ている。
As shown in the figure, a three-terminal regulator 13 is connected to the output side of the power supply circuit 11 via a power switch 12, an anode of a diode 14 is connected to the output side of the regulator 13, and a D- RAl
'l power terminal is connected. A diode 15 that produces a forward voltage drop equivalent to that of the diode 14 is interposed at the ground terminal of the three-terminal regulator 13.

また、バックアップ用電源としてのバッテリ15の正極
にマイクロバ・ワーレ1ギュレータ16が接続され、こ
のレギュレータ16の出力側にショットキーダイオード
17のアノードが接続され、ショットキーダイオード1
7のカソードに前記D−RAM1の電源端子が接続され
ている。
Further, a microbar regulator 16 is connected to the positive electrode of a battery 15 serving as a backup power source, and the anode of a Schottky diode 17 is connected to the output side of this regulator 16.
The power supply terminal of the D-RAM 1 is connected to the cathode of 7.

そして、本実施例では電源回路11の発生電圧を約6ボ
ルトどし、バッテリ16の発生電圧を約7ボルトとする
。また、3@子レギユレータ13は電源回路110発生
電圧を約5.3ボルトに安定化させるものとし、マイク
ロパワーレギュレータ17はバッテリ16の発生電圧を
約5ボルトに安定化させるものとする。なお、ダイオー
ド14゜15は約0.7ボルトの順方向電圧降下を生じ
るものであり、ショットキーダイオード18は約0.4
ボルトの順方向電圧降下を生じるものである。
In this embodiment, the voltage generated by the power supply circuit 11 is approximately 6 volts, and the voltage generated by the battery 16 is approximately 7 volts. Further, the 3@child regulator 13 is assumed to stabilize the voltage generated by the power supply circuit 110 to about 5.3 volts, and the micropower regulator 17 is assumed to stabilize the voltage generated by the battery 16 to about 5 volts. Note that the diodes 14 and 15 cause a forward voltage drop of approximately 0.7 volts, and the Schottky diode 18 causes a forward voltage drop of approximately 0.4 volts.
This produces a forward voltage drop of volts.

このような構成の本実施例の回路においては、電源スイ
ッチ12がONされている間は電源回路11の発生電圧
6ボルトが3端子レギユレータ13に供給される。そし
て、このレギュレータ13の作用により出力電圧が約5
.3ボルトに安定化されるが、ここでレギュレータ13
のグラウンド端子に順方向電圧降下分が約0.7ボルト
のダイオード15が介在されているので、レギュレータ
15の出力電圧は約6.0ボルト(5,3十0.7)と
なる。しかして、ダイオード14のカソード電位P1は
順方向電圧降下によって5.3ボルトとなる。
In the circuit of this embodiment having such a configuration, a voltage of 6 volts generated by the power supply circuit 11 is supplied to the three-terminal regulator 13 while the power switch 12 is turned on. Then, due to the action of this regulator 13, the output voltage is approximately 5
.. It is stabilized at 3 volts, but here regulator 13
Since a diode 15 with a forward voltage drop of about 0.7 volts is interposed at the ground terminal of the regulator 15, the output voltage of the regulator 15 is about 6.0 volts (5.30.7). Therefore, the cathode potential P1 of the diode 14 becomes 5.3 volts due to the forward voltage drop.

また、バッテリ16の発生電圧はマイクロパワーレギュ
レータ17に供給され、ここで約5ボルト(4,975
〜5.025ボルト)に安定化されてショットキーダイ
オード18へ出力される。
In addition, the voltage generated by the battery 16 is supplied to the micropower regulator 17, where it is approximately 5 volts (4,975 volts).
~5.025 volts) and output to the Schottky diode 18.

しかしてショットキーダイオード18のカソード電位P
2は約4.6ボルト(4,555〜4.625ボルト)
となる。
Therefore, the cathode potential P of the Schottky diode 18
2 is approximately 4.6 volts (4,555 to 4.625 volts)
becomes.

したがって、電源スィッチ12のON時にはPl>P2
となるのでD−RAMIの電源端子には電源回路側の電
源電圧的5.3ボルトが供給され、D−RAM1の記憶
動作が可能となる。一方、電源スィッチ12がOFFさ
れると、Pl<P2となった時点でバッテリ側の電源電
圧的4.6ボルトがD−RAM1の電源端子に供給され
、このときの電源電圧はD−RAM1の許容範囲以内で
あるのでD−RAM1の記憶動作が維持される。
Therefore, when the power switch 12 is turned on, Pl>P2
Therefore, the power supply voltage of 5.3 volts from the power supply circuit side is supplied to the power supply terminal of the D-RAMI, and the storage operation of the D-RAM1 becomes possible. On the other hand, when the power switch 12 is turned off, the power supply voltage of 4.6 volts on the battery side is supplied to the power supply terminal of the D-RAM1 when Pl<P2. Since it is within the permissible range, the storage operation of the D-RAM 1 is maintained.

すなわち、ダイオード14とショットキーダイオード1
8とは電源スィッチ12のON時とOFF時すなわち電
源バックアップ時とでD−RAM1の電源電圧を切換え
るための論理和回路を構成している。
That is, diode 14 and Schottky diode 1
8 constitutes an OR circuit for switching the power supply voltage of the D-RAM 1 when the power switch 12 is ON and OFF, that is, during power backup.

このように、本実施例の回路によればバッテリ16の容
量を従来のバッテリ6よりも大きくした状態で、バッテ
リ16による電源バックアップ時に従来の電源電圧的4
,8ボルトよりも小さい電源電圧的4.6ボルトをD−
RAM1に供給できる。第2図にD−RAM1における
リフレッシュ時の電?I電圧(横軸)と電源電流(縦軸
)との特性を示す。同図から明らかなように、電源電圧
が小さいと電源電流は少なくなり、バッテリ7の放電電
流も少なくなる。
As described above, according to the circuit of this embodiment, when the capacity of the battery 16 is made larger than that of the conventional battery 6, when the battery 16 is used for power backup, the conventional power supply voltage is 4.
, 8 volts less than the power supply voltage of 4.6 volts D-
It can be supplied to RAM1. Figure 2 shows the power consumption during refresh in D-RAM1. The characteristics of I voltage (horizontal axis) and power supply current (vertical axis) are shown. As is clear from the figure, when the power supply voltage is low, the power supply current decreases, and the discharge current of the battery 7 also decreases.

換言すれば、マイクロパワーレギュレータ17およびシ
ョットキーダイオード18として所要の値のものを選択
することにより、バッテリ16の容量を小さくすること
なくD−RAM1への電源バックアップ電圧を許容範囲
の最小値に近付けてバッテリ16の放電電流を抑制する
ことができる。
In other words, by selecting the required values for the micropower regulator 17 and the Schottky diode 18, the power backup voltage to the D-RAM 1 can be brought close to the minimum value of the allowable range without reducing the capacity of the battery 16. Therefore, the discharge current of the battery 16 can be suppressed.

その結果、バッテリ16によるバックアップ時間を従来
よりも延長できるという効果を奏する。
As a result, the backup time by the battery 16 can be extended more than before.

なお、前記実施例ではD−RAMIの電源バックアップ
回路として説明したが、それ以外の電源バックアップが
必要なメモリに適用できるのは言うまでもない。
Although the above embodiment has been described as a power backup circuit for D-RAMI, it goes without saying that it can be applied to other memories that require power backup.

[発明の効果] 以上詳述したように、本発明によれば、バックアップ用
電源の容量を小さくすることなくメモリのバックアップ
電源電圧を許容範囲の最小値に近付けて放電電流を抑制
し得、バックアップ時間の延長をはかり得るメモリの電
源バックアップ回路を提供できる。
[Effects of the Invention] As detailed above, according to the present invention, it is possible to suppress the discharge current by bringing the backup power supply voltage of the memory close to the minimum value of the allowable range without reducing the capacity of the backup power supply. It is possible to provide a memory power backup circuit that can extend the time.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の構成を示す回路図、第2図
はD−RAMのリフレッシュ時電源電圧−電源電流特性
図、第3図は従来の構成を示す回路図である。 1・・・D−RAM、11・・・電源回路、12・・・
電源スィッチ、13・・・3@子レギユレータ、14゜
15・・・ダイオード、16・・・バッテリ、17・・
・マイクロパワーレギュレータ、18・・・ショットキ
ーダイオード。
FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a power supply voltage-power supply current characteristic diagram during refreshing of a D-RAM, and FIG. 3 is a circuit diagram showing a conventional configuration. 1...D-RAM, 11...power supply circuit, 12...
Power switch, 13...3@child regulator, 14゜15...diode, 16...battery, 17...
・Micro power regulator, 18... Schottky diode.

Claims (1)

【特許請求の範囲】[Claims] バックアップ用電源と、このバックアップ用電源の正極
に接続され電源電圧を所定範囲に安定化させるレギュレ
ータと、このレギューレータの出力端子にアノードを接
続しかつメモリの電源端子にカソードを接続してなるダ
イオードとからなることを特徴とするメモリの電源バッ
クアップ回路。
A backup power supply, a regulator connected to the positive terminal of the backup power supply to stabilize the power supply voltage within a predetermined range, and a diode having an anode connected to the output terminal of the regulator and a cathode connected to the memory power supply terminal. A memory power backup circuit comprising:
JP62334662A 1987-12-28 1987-12-28 Backup circuit for power unit of memory Pending JPH01173211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62334662A JPH01173211A (en) 1987-12-28 1987-12-28 Backup circuit for power unit of memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62334662A JPH01173211A (en) 1987-12-28 1987-12-28 Backup circuit for power unit of memory

Publications (1)

Publication Number Publication Date
JPH01173211A true JPH01173211A (en) 1989-07-07

Family

ID=18279861

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62334662A Pending JPH01173211A (en) 1987-12-28 1987-12-28 Backup circuit for power unit of memory

Country Status (1)

Country Link
JP (1) JPH01173211A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012071864A1 (en) * 2010-12-03 2012-06-07 珠海天威技术开发有限公司 Chip for consumption material and container for consumption material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61103226A (en) * 1984-10-26 1986-05-21 Nec Corp Instantaneous power supply input type ram back-up circuit
JPS6351535B2 (en) * 1982-06-30 1988-10-14 Matsushita Electric Ind Co Ltd

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6351535B2 (en) * 1982-06-30 1988-10-14 Matsushita Electric Ind Co Ltd
JPS61103226A (en) * 1984-10-26 1986-05-21 Nec Corp Instantaneous power supply input type ram back-up circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012071864A1 (en) * 2010-12-03 2012-06-07 珠海天威技术开发有限公司 Chip for consumption material and container for consumption material

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