JPH05276688A - Load circuit for secondary cell - Google Patents
Load circuit for secondary cellInfo
- Publication number
- JPH05276688A JPH05276688A JP4065946A JP6594692A JPH05276688A JP H05276688 A JPH05276688 A JP H05276688A JP 4065946 A JP4065946 A JP 4065946A JP 6594692 A JP6594692 A JP 6594692A JP H05276688 A JPH05276688 A JP H05276688A
- Authority
- JP
- Japan
- Prior art keywords
- load
- secondary battery
- transistor
- circuit
- output
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、交流電源から直流電圧
を得るＡＣアダプタ、２次電池によって駆動される負荷
を備えた電子機器の電源回路に係わり、前記２次電池の
負荷回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit of an electronic device equipped with an AC adapter for obtaining a DC voltage from an AC power supply and a load driven by a secondary battery, and more particularly to a load circuit for the secondary battery.
【０００２】[0002]
【従来の技術】一般に種々の電子機器における負荷に対
して電流を供給する場合、商用交流電源を整流して直流
電圧を供給するか、あるいはバッテリ（特に２次電池）
から直流電圧を供給する電源回路が多用されており、そ
の一例として特開平２−１５９９３７号があげられ、こ
れは情報機器の無停電電源等に効果が大きいが、電源回
路におけるＡＣアダプタ、充電回路及び２次電池につい
ての構成は何ら示されていない。2. Description of the Related Art Generally, when a current is supplied to a load in various electronic devices, a commercial AC power source is rectified to supply a DC voltage, or a battery (particularly a secondary battery) is supplied.
A power supply circuit for supplying a direct current voltage is often used from JP-A-2-159937, and this is effective for an uninterruptible power supply of information equipment, but an AC adapter and a charging circuit in the power supply circuit. And no configuration for secondary batteries is shown.
【０００３】そこで従来は図４に示すようにＡＣアダプ
タから供給された電力は、電源スイッチをオンのときＤ
Ｃ−ＤＣコンバータを通じて負荷に供給されると同時に
充電回路を通じて２次電流に充電電流を供給する。この
場合、ダイオード（Ｄ1）は充電回路を経由しないでＡ
Ｃアダプタから無制限の電流が流れるのを防止してい
る。図４におけるダイオード（Ｄ2）はＡＣアダプタが
交流電源に接続されていないときに、２次電池の電力が
ＡＣアダプタ側で消費されるのを防止するためのもので
ある。Therefore, conventionally, as shown in FIG. 4, the electric power supplied from the AC adapter is D when the power switch is turned on.
The charging current is supplied to the load through the C-DC converter and at the same time the charging current is supplied to the secondary current through the charging circuit. In this case, the diode (D 1 ) does not go through the charging circuit
It prevents the unlimited current from flowing from the C adapter. The diode (D 2 ) in FIG. 4 is for preventing the power of the secondary battery from being consumed on the AC adapter side when the AC adapter is not connected to the AC power supply.
【０００４】[0004]
【発明が解決しようとする課題】前述の従来技術によれ
ば、前記ダイオード（Ｄ1）の順方向電圧の降下分が電
力損失となり、２次電池の使用可能時間を短くしてい
る。そこで本発明は、上記ダイオード（Ｄ1）における
電力損失を減少させ、２次電池の使用可能時間を長くで
きるようになした新規な構成を提案する。According to the above-mentioned prior art, the drop in the forward voltage of the diode (D 1 ) causes a power loss and shortens the usable time of the secondary battery. Therefore, the present invention proposes a novel configuration in which the power loss in the diode (D 1 ) is reduced and the usable time of the secondary battery can be lengthened.
【０００５】[0005]
【課題を解決するための手段】本発明は、ＡＣアダプ
タ、２次電池及び負荷を備えた電子機器において、ＡＣ
アダプタの出力側に前記充電回路を接続し、前記２次電
池、電源スイッチ及び負荷に直列にトランジスタの入出
力電極を接続し、前記トランジスタの制御電極に制御電
圧を印加する構成である。The present invention relates to an electronic device equipped with an AC adapter, a secondary battery, and a load.
The charging circuit is connected to the output side of the adapter, the input / output electrodes of the transistor are connected in series to the secondary battery, the power switch and the load, and a control voltage is applied to the control electrode of the transistor.
【０００６】[0006]
【作用】本発明の２次電池の負荷回路では、２次電池の
駆動電流路にトランジスタの入出力電極を直列に接続し
電源スイッチをオンにしたときの電力損失が軽減され
る。In the load circuit of the secondary battery of the present invention, the power loss when the input / output electrodes of the transistors are connected in series to the drive current path of the secondary battery and the power switch is turned on is reduced.
【０００７】[0007]
【実施例】図面に従って本発明を説明すると、図１は本
発明の２次電池の負荷回路を示す回路図、図２は他の実
施例を示す回路図、図３は図２の同回路を説明するため
のフローチャートを示す。1 is a circuit diagram showing a load circuit of a secondary battery of the present invention, FIG. 2 is a circuit diagram showing another embodiment, and FIG. 3 is a circuit diagram showing the same circuit of FIG. The flowchart for demonstrating is shown.
【０００８】図面において、（１）は交流電源に接続さ
れる電源プラグ、（２）はＡＣアダプタ、（３）は充電
回路、（４）は逆流阻止用ダイオード、（５）（６）は
分圧抵抗、（７）は２次電池、（８）は電源スイッチ、
（９）は負荷、（１０）は比較器、（１１）（１２）
（１３）はＭＯＳトランジスタ、（１４）は基準電圧設
定用のツェナーダイオード（１５）及び抵抗（１６）よ
り成る基準電圧回路、（１７）はＤＣ−ＤＣコンバー
タ、（１８）は前記ＭＯＳトランジスタの制御電極の電
圧を制御する制御回路を示す。In the drawings, (1) is a power plug connected to an AC power source, (2) is an AC adapter, (3) is a charging circuit, (4) is a reverse current blocking diode, and (5) and (6) are demultiplexers. Piezoresistor, (7) secondary battery, (8) power switch,
(9) is a load, (10) is a comparator, (11) and (12)
(13) is a MOS transistor, (14) is a reference voltage circuit including a Zener diode (15) and a resistor (16) for setting a reference voltage, (17) is a DC-DC converter, and (18) is control of the MOS transistor. 3 shows a control circuit for controlling the voltage of electrodes.
【０００９】次に図１の動作について説明すると、分圧
抵抗（５）（６）はＡＣアダプタ（２）から直流電圧が
供給されているか否かを検出するための構成、一方抵抗
（１６）及びツェナーダイオード（１５）は比較器（１
０）に対して基準電圧を供給する基準回路である。The operation of FIG. 1 will now be described. The voltage dividing resistors (5) and (6) are configured to detect whether or not a DC voltage is supplied from the AC adapter (2), and the resistor (16) is provided. And the Zener diode (15) is a comparator (1
0) is a reference circuit that supplies a reference voltage.
【００１０】先ずＡＣアダプタ（２）より直流電圧をダ
イオード（４）及び充電回路（３）に供給した場合、抵
抗（５）（６）で分圧された電圧が比較器（１０）の＋
端子に加わり、図示の状態では、比較器（１０）は出力
せず、ＭＯＳトランジスタ（１１）はオフとなっている
ので、２次電池（７）は充電回路（３）の出力により充
電され、この状態で電源スイッチ（８）をオンにする
と、前記比較器（１０）は出力せず、ＤＣ−ＤＣコンバ
ータ（１８）を介して負荷（９）に直流電圧を供給す
る。First, when a DC voltage is supplied from the AC adapter (2) to the diode (4) and the charging circuit (3), the voltage divided by the resistors (5) and (6) is + of the comparator (10).
In the state shown in the figure, the comparator (10) does not output and the MOS transistor (11) is off, so that the secondary battery (7) is charged by the output of the charging circuit (3). When the power switch (8) is turned on in this state, the comparator (10) does not output and supplies a DC voltage to the load (9) via the DC-DC converter (18).
【００１１】次にＡＣアダプタ（２）を交流電源から断
つと、ダイオード（４）はオフになると共に充電回路
（３）も不動作となって分圧抵抗（５）（６）の分圧点
の電位はアース電位に等しくなり、電源スイッチ（８）
をオンにするとＭＯＳトランジスタ（１１）はオンにな
り、２次電池（７）から該ＭＯＳトランジスタ（１１）
のドレイン・ソース路を通してＤＣ−ＤＣコンバータ
（１８）に直流電圧が供給され、負荷（９）はＤＣ−Ｄ
Ｃコンバータ（１８）の出力で駆動される。従って負荷
（９）を２次電池（７）で駆動する場合、ＭＯＳトラン
ジスタ（１１）がオンになって負荷電流が供給され、従
来のダイオードを使用した例に比べて、１０〜２０％に
電力損失を軽減できる。Next, when the AC adapter (2) is disconnected from the AC power source, the diode (4) is turned off and the charging circuit (3) is deactivated, and the voltage dividing points of the voltage dividing resistors (5) and (6) are turned off. The potential of is equal to the ground potential and the power switch (8)
When the MOS transistor (11) is turned on, the MOS transistor (11) is turned on and the MOS transistor (11) is turned on from the secondary battery (7).
DC voltage is supplied to the DC-DC converter (18) through the drain-source path of the
It is driven by the output of the C converter (18). Therefore, when the load (9) is driven by the secondary battery (7), the MOS transistor (11) is turned on and the load current is supplied, and the power consumption is 10 to 20% compared to the example using the conventional diode. You can reduce the loss.
【００１２】図２は本発明の他の実施例で、充電回路の
出力側にもＭＯＳトランジスタを用いて、２次電池の充
電時における従来のダイオードによる電力損失を軽減す
る構成となっており、充電回路（３）から制御回路（１
７）を介して制御信号を出力させて、ＭＯＳトランジス
タ（１１）のゲート電極を制御するものである。FIG. 2 shows another embodiment of the present invention, in which a MOS transistor is also used on the output side of the charging circuit to reduce the power loss due to the conventional diode when charging the secondary battery. From the charging circuit (3) to the control circuit (1
A control signal is output via 7) to control the gate electrode of the MOS transistor (11).
【００１３】図２の例では、ＡＣアダプタ（２）から２
次電池（７）に充電電流を供給すると共に２次電池
（７）で負荷（９）を駆動する場合、２次電池の充電路
と負荷電流路の各々にＭＯＳトランジスタを設けてあ
り、この場合の電力損失は従来のダイオード（Ｄ1及び
Ｄ2）に比べて１０〜２０％に軽減できる。図２の例で
は図３に示す通り、ＭＯＳトランジスタ（１１）（１
２）及び（１３）のオンによって２次電池の充電電流及
び負荷電流を２次電池（７）から供給するときに各ＭＯ
Ｓトランジスタのオンにより、抵抗値を最少限に軽減で
きるので、上述の様に電力損失は軽減される。図中ＭＯ
Ｓトランジスタのドレイン・ソース間に示した破線はＭ
ＯＳの寄生ダイオードを示す。In the example of FIG. 2, from the AC adapter (2) to 2
When the charging current is supplied to the secondary battery (7) and the load (9) is driven by the secondary battery (7), a MOS transistor is provided in each of the charging path and the load current path of the secondary battery. Power loss can be reduced to 10 to 20% compared to the conventional diodes (D 1 and D 2 ). In the example of FIG. 2, as shown in FIG. 3, the MOS transistors (11) (1
When the charging current and load current of the secondary battery are supplied from the secondary battery (7) by turning on 2) and (13), each MO
Since the resistance value can be reduced to the minimum by turning on the S transistor, the power loss is reduced as described above. MO in the figure
The broken line shown between the drain and source of the S transistor is M
The parasitic diode of OS is shown.
【００１４】[0014]
【発明の効果】本発明の２次電池の負荷回路によれば、
２次電池からの負荷電流供給時、電力損失を従来に比べ
て軽減でき、更に充電回路の電力損失も軽減できるの
で、電子機器の電源回路に使用すれば本発明回路のその
効果は極めて大きい。According to the load circuit of the secondary battery of the present invention,
When the load current is supplied from the secondary battery, the power loss can be reduced as compared with the conventional one, and the power loss of the charging circuit can be reduced. Therefore, the effect of the circuit of the present invention is extremely large when used in the power supply circuit of electronic equipment.
【図１】本発明の２次電池の負荷回路を示す回路図であ
る。FIG. 1 is a circuit diagram showing a load circuit of a secondary battery of the present invention.
【図２】本発明の２次電池の負荷回路を示す回路図であ
る。FIG. 2 is a circuit diagram showing a load circuit of a secondary battery of the present invention.
【図３】図２の回路の説明のためのフローチャートを示
す。FIG. 3 shows a flowchart for explaining the circuit of FIG.
【図４】従来の２次電池の負荷回路を示す回路図であ
る。FIG. 4 is a circuit diagram showing a load circuit of a conventional secondary battery.
（２） ＡＣアダプタ （３） 充電回路 （７） ２次電池 （８） 電源スイッチ （９） 負荷 （１１）（１２）（１３） ＭＯＳトランジスタ （１７） 制御回路 (2) AC adapter (3) Charging circuit (7) Secondary battery (8) Power switch (9) Load (11) (12) (13) MOS transistor (17) Control circuit
Claims (3)
ダプタ、２次電池及び負荷より成る電子機器において、
前記ＡＣアダプタの出力側に充電回路を接続し、前記２
次電池、電源スイッチ及び負荷に直列にトランジスタの
入出力電極、、直列に電源スイッチ及び負荷を接続し、
前記トランジスタの制御電極に制御電圧を印加して該制
御トランジスタをオンにすることを特徴とした２次電池
の負荷回路。1. An electronic device comprising an AC adapter for converting an AC power source into a DC voltage, a secondary battery and a load,
Connect a charging circuit to the output side of the AC adapter,
Connect the input / output electrodes of the transistor in series with the secondary battery, power switch and load, and connect the power switch and load in series,
A load circuit for a secondary battery, wherein a control voltage is applied to a control electrode of the transistor to turn on the control transistor.
タより構成され、前記ＡＣアダプタの出力側に直列に該
ＭＯＳ型トランジスタのドレイン・ソース路及び２次電
池を直列に接続し、前記ＭＯＳ型トランジスタのゲート
電極に制御電圧を印加することを特徴とした請求項１記
載の２次電池の負荷回路。2. The transistor is composed of a MOS type transistor, the drain / source path of the MOS type transistor and a secondary battery are connected in series to the output side of the AC adapter, and the gate electrode of the MOS type transistor is connected. The load circuit for the secondary battery according to claim 1, wherein a control voltage is applied to the load circuit.
ダプタ、２次電池及び負荷より成る電子機器において、
前記ＡＣアダプタの出力側に、ＭＯＳ型の第１トランジ
スタの入出力電極と電源スイッチと負荷とを直列に接続
し、前記ＡＣアダプタの出力側に接続された充電回路の
出力側を前記第１トランジスタの制御電極及び第２のト
ランジスタの入力及び制御電極に接続し、前記第１トラ
ンジスタの出力電極に２次電池を接続することを特徴と
した２次電池の負荷回路。3. An electronic device comprising an AC adapter for converting an AC power source into a DC voltage, a secondary battery and a load,
An input / output electrode of a MOS type first transistor, a power switch and a load are connected in series to the output side of the AC adapter, and the output side of a charging circuit connected to the output side of the AC adapter is connected to the first transistor. And a control electrode and an input and control electrode of a second transistor, and a secondary battery connected to the output electrode of the first transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4065946A JPH05276688A (en) | 1992-03-24 | 1992-03-24 | Load circuit for secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4065946A JPH05276688A (en) | 1992-03-24 | 1992-03-24 | Load circuit for secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05276688A true JPH05276688A (en) | 1993-10-22 |
Family
ID=13301651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4065946A Pending JPH05276688A (en) | 1992-03-24 | 1992-03-24 | Load circuit for secondary cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05276688A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005029675A1 (en) * | 2003-09-18 | 2005-03-31 | Hitachi, Ltd. | Backup circuit |
| CN100413176C (en) * | 2006-10-11 | 2008-08-20 | 何岳明 | Switching circuit of AC/DC bi service electric tool |
| WO2012067171A1 (en) * | 2010-11-18 | 2012-05-24 | 株式会社 日立メディコ | Mobile x-ray apparatus |
| US9252750B2 (en) | 2013-05-21 | 2016-02-02 | Renesas Electronics Corporation | Semiconductor integrated circuit and operating method thereof |
| WO2022145271A1 (en) * | 2020-12-28 | 2022-07-07 | パナソニックＩｐマネジメント株式会社 | Backup power supply control system, backup power supply system, and mobile body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0315234A (en) * | 1989-06-09 | 1991-01-23 | Matsushita Electric Ind Co Ltd | Power source switching circuit |
-
1992
- 1992-03-24 JP JP4065946A patent/JPH05276688A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0315234A (en) * | 1989-06-09 | 1991-01-23 | Matsushita Electric Ind Co Ltd | Power source switching circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005029675A1 (en) * | 2003-09-18 | 2005-03-31 | Hitachi, Ltd. | Backup circuit |
| US7376040B2 (en) | 2003-09-18 | 2008-05-20 | Hitachi, Ltd. | Backup circuit for holding information in a storage circuit when power cut-off occurs |
| CN100413176C (en) * | 2006-10-11 | 2008-08-20 | 何岳明 | Switching circuit of AC/DC bi service electric tool |
| WO2012067171A1 (en) * | 2010-11-18 | 2012-05-24 | 株式会社 日立メディコ | Mobile x-ray apparatus |
| JPWO2012067171A1 (en) * | 2010-11-18 | 2014-05-12 | 株式会社日立メディコ | Mobile X-ray device |
| US9131592B2 (en) | 2010-11-18 | 2015-09-08 | Hitachi Medical Corporation | Mobile X-ray apparatus |
| US9252750B2 (en) | 2013-05-21 | 2016-02-02 | Renesas Electronics Corporation | Semiconductor integrated circuit and operating method thereof |
| WO2022145271A1 (en) * | 2020-12-28 | 2022-07-07 | パナソニックＩｐマネジメント株式会社 | Backup power supply control system, backup power supply system, and mobile body |
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