JPS5897721A - Power supply circuit - Google Patents
Power supply circuitInfo
- Publication number
- JPS5897721A JPS5897721A JP56195934A JP19593481A JPS5897721A JP S5897721 A JPS5897721 A JP S5897721A JP 56195934 A JP56195934 A JP 56195934A JP 19593481 A JP19593481 A JP 19593481A JP S5897721 A JPS5897721 A JP S5897721A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- battery
- voltage
- load
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Direct Current Feeding And Distribution (AREA)
- Power Sources (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は主電源の他に補助電源を有する電源回路に係り
、補助電源が不用意に必要以上に消費されるのを極力防
止できる優れた電源回路を提供することを目的とするも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply circuit having an auxiliary power supply in addition to the main power supply, and an object of the present invention is to provide an excellent power supply circuit that can prevent the auxiliary power supply from being inadvertently consumed more than necessary. This is the purpose.
一般にマイクロコンビーータ等を内蔵した機器等におい
ては主電源用の電池等を交換する際にマイクロコンピュ
ータ等に記憶された情報が消滅しないようにするために
、別に補助電源を設けておく必要がある。したがって、
従来よりこの種の機器に使用する電源回路は第１図に示
すように構成することが多い。第１図において、１は主
電源用の電池、２，３は定電圧回路を構成する抵抗及び
定電圧ダイオード、４，６はスイッチング用ダイオード
、６は補助電源用の電池、７は抵抗、８はマイクロコン
ビーータ等の負荷回路、９は負荷回路８の動作を動作状
態、保持状態に切換える切換スイッチである。Generally, in devices with a built-in microcomputer, etc., it is necessary to provide a separate auxiliary power source to prevent the information stored in the microcomputer from disappearing when replacing the main power battery, etc. be. therefore,
Conventionally, power supply circuits used in this type of equipment have often been configured as shown in FIG. In Figure 1, 1 is a battery for the main power supply, 2 and 3 are resistors and constant voltage diodes that constitute a constant voltage circuit, 4 and 6 are switching diodes, 6 is a battery for auxiliary power supply, 7 is a resistor, and 8 9 is a load circuit such as a microconbeater, and 9 is a changeover switch for switching the operation of the load circuit 8 between an operating state and a holding state.
第１図に示す従来の電源回路において主電源用の電池１
が充分な電源供給能力を有する場合には定電圧ダイオー
ド３によって抵抗２と定電圧ダイオード３との接続点に
一定の電圧が現われダイオード４がオンし、上記一定の
電圧が負荷回路８に印加される。主電源用の電池１が電
源供給能力を有しないようになったり、そのために主電
源用の電池を取除いた場合にはダイオード６がオンし補
助電源用の電池６から負荷回路８に所定の電圧が印加さ
れる。In the conventional power supply circuit shown in Fig. 1, a battery 1 for main power supply is used.
has sufficient power supply capability, a constant voltage appears at the connection point between the resistor 2 and the constant voltage diode 3 by the constant voltage diode 3, the diode 4 is turned on, and the constant voltage is applied to the load circuit 8. Ru. If the main power battery 1 no longer has the power supply capacity or if the main power battery is removed, the diode 6 turns on and the auxiliary power battery 6 connects the load circuit 8 to a specified level. A voltage is applied.
ところで、この場合、従来の電源回路では切換３１、−
、
スイッチ９０オン、オフ状態すなわち負荷回路８の動作
状態、保持状態に関係なく、補助電源用電池６から負荷
回路８に電源が供給されるため、誤まって切換スイッチ
９をオフ状態にし、負荷回路８を動作状態にした状態で
主電源用の電池１を取除くと補助電源用電池６の消耗が
著しく早くなり負荷回路８に記憶された情報が誤まって
消滅してしまうことがあるなどきわめて不都合なもので
あった。By the way, in this case, in the conventional power supply circuit, the switching 31, -
Since power is supplied from the auxiliary power battery 6 to the load circuit 8 regardless of the on/off state of the switch 90, that is, the operating state or holding state of the load circuit 8, the changeover switch 9 may be mistakenly turned off and the load If the main power supply battery 1 is removed while the circuit 8 is in operation, the auxiliary power supply battery 6 will wear out significantly faster, and the information stored in the load circuit 8 may be erased by mistake. It was extremely inconvenient.
本発明は以上のような従来の欠点を除去するものであり
、主電源から補助電源に切換えられる際には、その以前
に強制的に負荷回路が保持状態に切換えられるように構
成したものアある。The present invention eliminates the above-mentioned conventional drawbacks, and is configured such that the load circuit is forcibly switched to the holding state before switching from the main power source to the auxiliary power source. .
以下、本発明の電源回路について一実施例の図面ととも
に説明する。第２図は本発明の電源回路における一実施
例の電気的峙線図であり、図中、１０は主電源用の電池
、１１．１２は定電圧回路を構成する抵抗及び定電圧ダ
イオード、１３．１４は第１のトランジスタ１６のベー
スバイアス用抵抗、１６は第１のトランジスタ１６のベ
ースと第２のトランジスタ１７のベースとの間に接続さ
れたダイオード、１８は第２のトランジスタ１７のコレ
クタ、アース間に接続された抵抗、１９はマイクロコン
ピュータ等の負荷回路、２０は負荷回路１９の動作状態
、保持状態切換用端子と上記第２のトランジスタ１７の
コレクタとの間に接続された抵抗、２１は上記端子とア
ースとの間に接続された動作状態、保持状態切換用のス
イッチ、２２は負荷回路１９の電源端子と抵抗１１との
間に接続されたダイオード、２３は補助電源用の電池、
２４は補助電源用電池２３と負荷回路１９の電源端子と
の間に接続された第３のトランジスタ、２６は第３のト
ランジスタ２４のベースに接続されたダイオード、２６
はダイオード２６とアースとの間に接続された抵抗であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply circuit according to the present invention will be described below with reference to drawings of an embodiment. FIG. 2 is an electrical line diagram of one embodiment of the power supply circuit of the present invention, in which 10 is a battery for the main power supply, 11.12 is a resistor and a constant voltage diode constituting a constant voltage circuit, and 13 .14 is a base bias resistor of the first transistor 16; 16 is a diode connected between the base of the first transistor 16 and the base of the second transistor 17; 18 is the collector of the second transistor 17; A resistor 19 is connected between the ground, a load circuit such as a microcomputer, 20 is a resistor connected between the operating state of the load circuit 19, the holding state switching terminal, and the collector of the second transistor 17, and 21 22 is a diode connected between the power supply terminal of the load circuit 19 and the resistor 11; 23 is a battery for auxiliary power supply;
24 is a third transistor connected between the auxiliary power battery 23 and the power supply terminal of the load circuit 19; 26 is a diode connected to the base of the third transistor 24;
is a resistor connected between diode 26 and ground.
上記実施例において主電源用の電池１ｏが充分電源供給
能力を有する場合には抵抗１１と定電圧ダイオード１２
との接続点に定電圧ダイオード１２によって決定される
一定の電圧が現われ、これがダイオード２２を介して負
荷回路１９の電源端子に印加される。そして、この場合
には抵抗１３の電圧降下も所定の値を維持しており第１
．第２のトランジスタ１５．１７が共にオンの状態にあ
る。In the above embodiment, if the main power supply battery 1o has sufficient power supply capacity, the resistor 11 and the constant voltage diode 12
A constant voltage determined by the constant voltage diode 12 appears at the connection point with the constant voltage diode 12, and this voltage is applied to the power supply terminal of the load circuit 19 via the diode 22. In this case, the voltage drop across the resistor 13 also maintains a predetermined value, and the first
．． The second transistors 15, 17 are both in the on state.
したがって、第３のトランジスタ２４はオフの状態にあ
り補助電源用電池２３は完全に切離されている。そして
、第２のトランジスタ１７がオンの状態にあることから
、スイッチ２１がオフの状態では負荷回路１９が動作状
態になり、オンした場合には保持状態に切換えられる。Therefore, the third transistor 24 is in an off state and the auxiliary power supply battery 23 is completely disconnected. Since the second transistor 17 is in an on state, the load circuit 19 is in an operating state when the switch 21 is off, and is switched to a holding state when it is on.
今、主電源用電池１０の電圧が低下して主電源用電池１
０の電源供給能力が不足し、あるいはそのために主電源
用電池１ｏを触除いたとする。この場合には抵抗１１と
定電圧ダイオード１２との接続点における電源が極端に
低下するため、抵抗１３による電圧降下も少なくなり、
トランジスタ１５．１７が共にオフすることになる。し
たがって、この状態ではトランジスタ２４がオンし、補
助電源用電池２３の電圧がトランジスタ２４を介して負
荷回路１９の電源端子に印加されることになる。そして
、この場合にはトランジスタ１７が ・オフすること
からスイッチ２１のオン、オフ状態に関係なく負荷回路
１９の動作状態、保持状態切換用端子のレベルはローレ
ベルになり５実質的にスイッチ２１がオンされたと同じ
状態になる。すなわち、この状態では、負荷回゛路１９
が強制的に保持状態になることになり、補助電源用電池
２３の消耗が著しく少なくなる。Now, the voltage of the main power battery 10 has decreased and the main power battery 1
Suppose that the main power supply battery 1o is removed due to insufficient power supply capacity of the main power supply battery 1o. In this case, the power supply at the connection point between the resistor 11 and the voltage regulator diode 12 is extremely reduced, so the voltage drop due to the resistor 13 is also reduced.
Transistors 15 and 17 will both be turned off. Therefore, in this state, the transistor 24 is turned on, and the voltage of the auxiliary power supply battery 23 is applied to the power supply terminal of the load circuit 19 via the transistor 24. In this case, since the transistor 17 is turned off, the operating state of the load circuit 19 and the level of the holding state switching terminal become low level regardless of whether the switch 21 is on or off. It will be in the same state as when it is turned on. That is, in this state, the load circuit 19
is forced into the holding state, and the consumption of the auxiliary power battery 23 is significantly reduced.
以上、実施例より明らかなように、本発明の電源回路は
、主電源と補助電源とを有し主電源の電圧がある一定の
電圧以下になったとき動作するスイッチング回路によっ
てマイクロコンピータ等の負荷回路を強制的に保持状態
に切換えこの状態で補助電源より上記負荷回路に電源が
供給されるように構成したものであり、補助電源を用い
るときには必ず負荷回路が強制的に保持状態になり、し
たがって、補助電源が早期に消耗するようなことは全て
なく、小さな容量の補助電源でも充分にその役目を果た
し得るなど実用上きわめて有利なものである。As is clear from the above embodiments, the power supply circuit of the present invention has a main power supply and an auxiliary power supply, and uses a switching circuit that operates when the voltage of the main power supply drops below a certain voltage to power a load such as a microcomputer. The circuit is forcibly switched to the holding state, and in this state power is supplied from the auxiliary power supply to the above load circuit.When using the auxiliary power supply, the load circuit is always forced to the holding state, and therefore The auxiliary power supply does not run out prematurely, and even a small capacity auxiliary power supply can fulfill its role, which is extremely advantageous in practice.
７、−７
第１図は従来の電源回路の電気的結線図、第２図は本発
明の電源回路の一実施例の電気的結線図である。
１ｏ・・・・・・主電源用電池、１１ 、１３ 、１４
．１ Ｂ。
２０．２８・・・・・・抵抗、１２・・・・・・定電圧
ダイオード、１５．１７，２４・・・・・・トランジス
タ、１６，２２゜２６・・・−・・ダイオード、１９・
・・・・・負荷回路、２１・・・・・・・動作状態、保
持状態切換用スイッーチ、２３・・・・・・補助電源用
電池。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名特開
昭５８−９７７２１＜３）7, -7 FIG. 1 is an electrical wiring diagram of a conventional power supply circuit, and FIG. 2 is an electrical wiring diagram of an embodiment of the power supply circuit of the present invention. 1o...Battery for main power supply, 11, 13, 14
．． 1B. 20.28... Resistor, 12... Constant voltage diode, 15.17, 24... Transistor, 16,22゜26...- Diode, 19.
. . . Load circuit, 21 . . . Switch for switching operating state and holding state, 23 . . . Battery for auxiliary power supply. Name of agent: Patent attorney Toshio Nakao and one other person JP-A-58-97721<3)
Claims (1)
められた一定電圧以下に低下したとき動作するスイッチ
ング回路によってマイクロコンピュータ等の負荷回路を
強制的に動作状態から保持状態に切換えると共に上記負
荷回路に主電源からの電圧に代えて補助電源からの電圧
が印加されるように構成した電源回路。It has a main power supply and an auxiliary power supply, and uses a switching circuit that operates when the voltage from the main power supply drops below a predetermined constant voltage to forcibly switch a load circuit such as a microcomputer from an operating state to a holding state. A power supply circuit configured such that a voltage from an auxiliary power supply is applied to the load circuit in place of the voltage from the main power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56195934A JPS5897721A (en) | 1981-12-04 | 1981-12-04 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56195934A JPS5897721A (en) | 1981-12-04 | 1981-12-04 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5897721A true JPS5897721A (en) | 1983-06-10 |
Family
ID=16349398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56195934A Pending JPS5897721A (en) | 1981-12-04 | 1981-12-04 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5897721A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5915132U (en) * | 1982-07-19 | 1984-01-30 | 三洋電機株式会社 | Discharge prevention device |
| JPH0277816A (en) * | 1988-05-06 | 1990-03-16 | Digital Equip Corp <Dec> | Pass-through energy-boosting circuit |
-
1981
- 1981-12-04 JP JP56195934A patent/JPS5897721A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5915132U (en) * | 1982-07-19 | 1984-01-30 | 三洋電機株式会社 | Discharge prevention device |
| JPH0277816A (en) * | 1988-05-06 | 1990-03-16 | Digital Equip Corp <Dec> | Pass-through energy-boosting circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5475332A (en) | Power source circuit | |
| WO2001013492A1 (en) | A switch circuit | |
| JPS5897721A (en) | Power supply circuit | |
| US5852377A (en) | Reset circuit for ensuring proper reset when used with decaying power supplies | |
| JPS6353567B2 (en) | ||
| JPS60183945A (en) | Backup circuit | |
| JPS5897719A (en) | Power supply circuit | |
| JP3412026B2 (en) | Power supply selection device for AC / DC dual-purpose electronic equipment | |
| JPH10257691A (en) | Power supply circuit for incorporating encoder | |
| JPH1049257A (en) | Information processor | |
| JPS63288309A (en) | Power source switching control circuit for electronic apparatus | |
| JPH0124656Y2 (en) | ||
| JPS626753Y2 (en) | ||
| KR910005012Y1 (en) | Power selection circuit | |
| KR950002023B1 (en) | Circuit for backup cmos memory | |
| JPH0620181Y2 (en) | Reset device | |
| KR930002027Y1 (en) | Circuit for back-up battery | |
| JPS6023370B2 (en) | power circuit | |
| JPS6234359Y2 (en) | ||
| JPS6348133A (en) | Electric source circuit for memory backup | |
| JPH02114191A (en) | Power source switch circuit | |
| JPS59127540A (en) | Backup power source circuit | |
| JPS63133841A (en) | Electric source circuit | |
| JPS59121418A (en) | Back-up power supply circuit for ic memory | |
| JPH04242032A (en) | Power supply cut detection circuit |