JP2001296928A - Power source circuit - Google Patents
Power source circuitInfo
- Publication number
- JP2001296928A JP2001296928A JP2000113509A JP2000113509A JP2001296928A JP 2001296928 A JP2001296928 A JP 2001296928A JP 2000113509 A JP2000113509 A JP 2000113509A JP 2000113509 A JP2000113509 A JP 2000113509A JP 2001296928 A JP2001296928 A JP 2001296928A
- Authority
- JP
- Japan
- Prior art keywords
- storage element
- battery
- power supply
- path
- switch
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、機器の負荷変動に伴う電
池の電圧変動を吸収する蓄電素子を備えた電源回路に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit provided with a power storage element for absorbing a voltage change of a battery accompanying a load change of a device.
【０００２】[0002]
【従来技術およびその問題点】近年では、電子機器内部
に流れる電流変化（負荷変動）に伴う電池の電圧変動を
抑制するため、電池に蓄電素子を並列接続した電池装置
が提案されている。この用途の蓄電素子としては、等価
直列抵抗（ＥＳＲ）が低くかつ蓄積容量が大きいものが
適しており、主に電気二重層コンデンサを使用してい
る。しかし、過電流保護回路を備えた電池、例えば、い
わゆるリチウムイオン電池を使用している場合には、電
気二重層コンデンサの充電時に所定の過電流検出値以上
の電流が流れてしまい、その結果、過電流保護回路が遮
断動作して電池の出力が遮断されてしまう場合がある。
その場合、使用者は過電流保護回路が遮断動作したこと
を認識することができないため、電池残量がない、また
は機器の故障か、と誤認識してしまう。2. Description of the Related Art In recent years, a battery device in which an electric storage element is connected in parallel with a battery has been proposed in order to suppress a voltage change of the battery due to a change in current (load change) flowing in an electronic device. As an electric storage element for this purpose, an element having a low equivalent series resistance (ESR) and a large storage capacity is suitable, and an electric double layer capacitor is mainly used. However, when a battery provided with an overcurrent protection circuit, for example, a so-called lithium ion battery is used, a current equal to or greater than a predetermined overcurrent detection value flows when the electric double layer capacitor is charged, and as a result, There is a case where the overcurrent protection circuit is turned off and the output of the battery is cut off.
In this case, since the user cannot recognize that the overcurrent protection circuit has been shut off, the user may erroneously recognize that there is no remaining battery or that the device has failed.
【０００３】[0003]
【発明の目的】本発明は、電池が備えた保護回路の遮断
動作を回避して蓄電素子を充電することができる電源回
路を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply circuit capable of charging a power storage element while avoiding an interruption operation of a protection circuit provided in a battery.
【０００４】[0004]
【発明の概要】本発明は、所定の過電流検出値以上の電
流が規定時間以上連続して出力されたことを検知すると
該出力を遮断する保護回路を備えた電池に接続される電
源回路において、蓄電素子と、前記電池と蓄電素子とを
接続する第１経路に設けた第１スイッチ手段と、前記蓄
電素子の端子電圧が所定のしきい値未満のときは、前記
保護回路が遮断動作しないように前記第１スイッチ手段
をスイッチングさせて前記第１経路で前記蓄電素子を間
欠充電し、前記蓄電素子の端子電圧が前記所定のしきい
値以上であるときには、前記第１経路を迂回する第２経
路で前記電池と前記蓄電素子とを接続して前記蓄電素子
を連続充電する充電制御手段とを備えたことに特徴を有
する。この構成によれば、蓄電素子の充電時に保護回路
が遮断動作することがなく、電池残量がない・機器が故
障したなどの誤認識を使用者に与えることもなくなる。
しかも間欠充電と連続充電を切換えるので、間欠充電だ
けで蓄電素子を充電するよりも、第１スイッチ手段のス
イッチングに伴うスイッチングノイズの発生を最小限に
抑えることができ、また充電時間の短縮を図ることがで
きる。前記蓄電素子の間欠充電における前記スイッチン
グ素子のオン時間は、前記保護回路の規定時間未満であ
るか、または前記蓄電素子の充電に伴い減少する前記電
池の出力が前記過電流検出値を超えない時間であると好
ましい。この構成によれば、保護回路が遮断動作しない
範囲で最大の電流出力で蓄電素子を間欠充電できるの
で、充電時間の短縮化が図れる。SUMMARY OF THE INVENTION The present invention relates to a power supply circuit connected to a battery provided with a protection circuit for shutting off output when a current equal to or greater than a predetermined overcurrent detection value is continuously output for a specified time or more. A power storage element, first switch means provided on a first path connecting the battery and the power storage element, and when a terminal voltage of the power storage element is less than a predetermined threshold value, the protection circuit does not perform a shut-off operation. As described above, the first switch means is switched to intermittently charge the power storage element in the first path, and when the terminal voltage of the power storage element is equal to or higher than the predetermined threshold, the first path bypasses the first path. The battery is characterized by including charge control means for connecting the battery and the power storage element by two routes to continuously charge the power storage element. According to this configuration, the protection circuit does not perform the shut-off operation when the storage element is charged, and does not give the user erroneous recognition that there is no remaining battery or that the device has failed.
In addition, since the switching between the intermittent charging and the continuous charging is performed, the generation of switching noise due to the switching of the first switch means can be minimized and the charging time can be reduced, as compared with the case where the electric storage element is charged only by the intermittent charging. be able to. The on-time of the switching element during the intermittent charging of the storage element is less than a specified time of the protection circuit, or a time during which the output of the battery, which decreases with the charging of the storage element, does not exceed the overcurrent detection value. Is preferable. According to this configuration, the power storage element can be intermittently charged with the maximum current output within a range in which the protection circuit does not perform the cutoff operation, so that the charging time can be reduced.
【０００５】[0005]
【発明の実施の形態】以下、図面に基づいて本発明を説
明する。図１は、本発明を適用した電源回路の主要構成
をブロックで示す図である。本電源回路１００は、保護
回路２１０を備えた電池２００と、負荷３００との間に
配設される。電池２００から出力された電源電流Ｉは、
電源回路１００を介して駆動電流ＩLとされ、負荷３０
０に供給される。保護回路２１０は、所定の過電流検出
値以上の電源電流Ｉが規定時間以上連続して出力された
ことを検知すると、電池２００の出力を遮断する回路で
ある。保護回路を備えた電池としては、携帯機器に多く
利用されるリチウムイオン電池等がある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of a power supply circuit to which the present invention is applied. The power supply circuit 100 is provided between a battery 200 having a protection circuit 210 and a load 300. The power supply current I output from the battery 200 is
The drive current I L is supplied via the power supply circuit 100 and the load 30
0 is supplied. The protection circuit 210 is a circuit that shuts off the output of the battery 200 when it detects that the power supply current I equal to or greater than the predetermined overcurrent detection value has been output continuously for a specified time or more. As a battery provided with a protection circuit, there is a lithium ion battery or the like often used in portable devices.
【０００６】電源回路１００には、電池２００に対して
並列に接続される蓄電素子１０が備えられている。蓄電
素子１０は、電流制限部２０を介し電池２００によって
充電され、電池２００の補助電源として機能する。本実
施形態では蓄電素子１０として電気二重層コンデンサを
使用する。電流制限部２０は、数１０ｍΩ程度の低い抵
抗値を持つ抵抗２１と、電池２００と蓄電素子１０を接
続する第１経路に設けた第１スイッチング素子ＳＷ１
と、抵抗２１を介して電池２００と蓄電素子１０を接続
する第２経路に設けた第２スイッチＳＷ２を有する。第
１スイッチング素子ＳＷ１は、充電制御回路３０の制御
下で、スイッチングコントローラ４０を介してスイッチ
ングされる。一方、第２スイッチＳＷ２のオン／オフ
は、充電制御回路３０によって制御される。[0006] The power supply circuit 100 includes a power storage element 10 connected in parallel to the battery 200. The storage element 10 is charged by the battery 200 via the current limiting unit 20 and functions as an auxiliary power supply for the battery 200. In this embodiment, an electric double layer capacitor is used as the storage element 10. The current limiting unit 20 includes a resistor 21 having a low resistance value of about several tens of mΩ and a first switching element SW1 provided on a first path connecting the battery 200 and the storage element 10.
And a second switch SW2 provided on a second path connecting the battery 200 and the storage element 10 via the resistor 21. The first switching element SW1 is switched via the switching controller 40 under the control of the charge control circuit 30. On the other hand, ON / OFF of the second switch SW2 is controlled by the charge control circuit 30.
【０００７】充電制御回路３０は、蓄電素子１０の端子
電圧Ｖｃを検出する電圧検出部３０ａと、蓄電素子１０
の間欠充電が必要か否かの判断基準となる基準電圧Ｖre
fなど各種の制御用データを格納してあるメモリ部３０
ｂと、メモリ部３０ｂから読み出した基準電圧Ｖrefと
電圧検出部３０ａが検出した端子電圧Ｖｃとを比較する
比較部３０ｃと、比較部３０ｃの比較結果に応じてスイ
ッチングコントローラ４０を制御するとともに第２スイ
ッチＳＷ２のオン／オフを制御する制御部３０ｄとを備
えている。マイコン３０にはＤＣ／ＤＣ変換器３５及び
バックアップ用電池５０が接続されている。このマイコ
ン３０は、電池２００が電源回路１００に接続されてい
る状態では、ＤＣ／ＤＣ変換器３５を介して電池２００
の出力を一定電圧にして入力して動作し、電池２００が
電源回路１００に接続されていない状態では、バックア
ップ用電池５０から電力供給を受けて動作する。The charge control circuit 30 includes a voltage detector 30a for detecting a terminal voltage Vc of the storage element 10,
Reference voltage Vre which is a criterion for determining whether or not intermittent charging is necessary
memory unit 30 storing various control data such as f
b, a comparison unit 30c that compares the reference voltage Vref read from the memory unit 30b with the terminal voltage Vc detected by the voltage detection unit 30a, and controls the switching controller 40 in accordance with the comparison result of the comparison unit 30c. A control unit 30d for controlling ON / OFF of the switch SW2. The microcomputer 30 is connected with a DC / DC converter 35 and a backup battery 50. When the battery 200 is connected to the power supply circuit 100, the microcomputer 30 controls the battery 200 via the DC / DC converter 35.
When the battery 200 is not connected to the power supply circuit 100, it operates by receiving power supply from the backup battery 50.
【０００８】以下では、充電制御回路３０の一例として
マイコンを使用した場合に、充電制御回路（マイコン）
３０が実行する充電制御処理について、図２に示される
フローチャートを参照し、詳細に説明する。この処理
は、電池２００が電源回路１００に接続される度に入
る。In the following, when a microcomputer is used as an example of the charge control circuit 30, the charge control circuit (microcomputer)
The charge control process executed by 30 will be described in detail with reference to the flowchart shown in FIG. This process is started each time the battery 200 is connected to the power supply circuit 100.
【０００９】この処理に入ると先ず、蓄電素子１０の端
子電圧Ｖｃを検出し（Ｓ１１）、メモリ部３０ｂから基
準電圧Ｖrefを読み出して、検出した端子電圧Ｖｃが基
準電圧Ｖref以上であるかどうかをチェックする（Ｓ１
３）。基準電圧Ｖrefは、電池２００と蓄電素子１０を
直接接続しても電源電流Ｉが過電流検出値を超えなくな
るしきい電圧値であり、また蓄電素子１０の間欠充電が
必要か否かの判断基準となる電圧値でもある。In this process, first, the terminal voltage Vc of the storage element 10 is detected (S11), the reference voltage Vref is read from the memory unit 30b, and it is determined whether the detected terminal voltage Vc is higher than the reference voltage Vref. Check (S1
3). The reference voltage Vref is a threshold voltage value at which the power supply current I does not exceed the overcurrent detection value even when the battery 200 and the storage element 10 are directly connected, and a criterion for determining whether intermittent charging of the storage element 10 is necessary. Is also the voltage value
【００１０】蓄電素子１０の端子電圧Ｖｃが基準電圧Ｖ
ref以上でなかったときは（Ｓ１３；Ｎ）、第１スイッ
チング素子ＳＷ１のスイッチングを開始し（Ｓ１５）、
端子電圧Ｖｃが基準電圧Ｖref以上となるまで、図１に
示す第１経路で蓄電素子１０の間欠充電を続ける。な
お、第１スイッチング素子ＳＷ１のオン時間は保護回路
２１０の規定時間未満である。蓄電素子１０の端子電圧
Ｖｃが基準電圧Ｖref以上であったときは（Ｓ１３；
Ｙ）、第２スイッチＳＷ２をオンするとともに、第１ス
イッチング素子ＳＷ１をオフしてスイッチングを停止す
る（Ｓ１７、Ｓ１９）。すると、蓄電素子１０の間欠充
電が停止されるとともに充電経路が第１経路から第２経
路に切換わる。これにより、電池２００から出力された
電源電流Ｉは、第１スイッチング素子ＳＷ１をバイパス
して抵抗２１及び蓄電素子１０に流れ込み、蓄電素子１
０の連続充電が実行される。The terminal voltage Vc of the storage element 10 is equal to the reference voltage V
If not more than ref (S13; N), the switching of the first switching element SW1 is started (S15),
Until the terminal voltage Vc becomes equal to or higher than the reference voltage Vref, the intermittent charging of the power storage element 10 is continued along the first path shown in FIG. Note that the ON time of the first switching element SW1 is shorter than the specified time of the protection circuit 210. When the terminal voltage Vc of the storage element 10 is higher than the reference voltage Vref (S13;
Y) The second switch SW2 is turned on, and the first switching element SW1 is turned off to stop switching (S17, S19). Then, the intermittent charging of power storage element 10 is stopped, and the charging path is switched from the first path to the second path. As a result, the power supply current I output from the battery 200 bypasses the first switching element SW1, flows into the resistor 21 and the power storage element 10, and
Continuous charging of 0 is performed.
【００１１】続いて、蓄電素子１０の端子電圧Ｖｃを検
出し（Ｓ２１）、端子電圧Ｖｃが基準電圧Ｖref以上か
どうかをチェックする（Ｓ２３）。蓄電素子１０の端子
電圧Ｖｃが基準電圧Ｖref以上であったときは（Ｓ２
３；Ｙ）、Ｓ２１へ戻り、定期的に端子電圧Ｖｃをチェ
ックする。一方、蓄電素子１０の端子電圧Ｖｃが基準電
圧Ｖref未満であったときは（Ｓ２３；Ｎ）、第２スイ
ッチＳＷ２をオフし、Ｓ１１へ戻る（Ｓ２５）。これに
より、蓄電素子１０の連続充電が停止されて充電経路が
第２経路から第１経路に切換わり、戻ったＳ１５で蓄電
素子１０の間欠充電が開始される。Then, the terminal voltage Vc of the storage element 10 is detected (S21), and it is checked whether the terminal voltage Vc is higher than the reference voltage Vref (S23). When the terminal voltage Vc of the storage element 10 is higher than the reference voltage Vref (S2
3; Y), returning to S21, periodically checking the terminal voltage Vc. On the other hand, when the terminal voltage Vc of the storage element 10 is lower than the reference voltage Vref (S23; N), the second switch SW2 is turned off, and the process returns to S11 (S25). As a result, the continuous charging of the power storage element 10 is stopped, the charging path is switched from the second path to the first path, and the intermittent charging of the power storage element 10 is started in step S15.
【００１２】以上では、説明簡単のため、充電制御回路
３０としてマイコンを使用し、ソフトウェア的に制御す
る場合について説明したが、充電制御回路３０を電圧検
出器、ＦＥＴなど複数の電子部品で構成して蓄電素子１
０の充電をハードウェア的に制御することは勿論可能で
ある。以下に、充電制御回路３０をハードウェア構成し
た一実施の形態について、図３を参照して具体的に説明
する。In the above, for the sake of simplicity, a case has been described in which a microcomputer is used as the charge control circuit 30 and control is performed by software. However, the charge control circuit 30 is constituted by a plurality of electronic components such as a voltage detector and an FET. Storage element 1
It is of course possible to control the charging of 0 by hardware. Hereinafter, an embodiment in which the charge control circuit 30 is configured by hardware will be specifically described with reference to FIG.
【００１３】図３に示す電源回路１００は、第１スイッ
チング素子ＳＷ１として第１ＭＯＳＦＥＴ１１０を、第
２スイッチＳＷ２及び抵抗２１として第２ＭＯＳＦＥＴ
１２０を、スイッチングコントローラ４０としてＤＣ／
ＤＣコントロールＩＣ１３０を、充電制御回路３０とし
て電圧検出器１５０及びデジタルトランジスタ１６０を
設けている。The power supply circuit 100 shown in FIG. 3 includes a first MOSFET 110 as a first switching element SW1 and a second MOSFET as a second switch SW2 and a resistor 21.
DC / DC 120 as the switching controller 40
The DC control IC 130 includes a voltage detector 150 and a digital transistor 160 as the charge control circuit 30.
【００１４】ＤＣ／ＤＣコントロールＩＣ１３０は、電
源端子が電源ラインとして電池２００に接続され、ＤＣ
／ＤＣコントロールＩＣ１３０のオン／オフを制御する
ＳＤ（シャットダウン）端子がデジタルトランジスタ１
６０のコレクタに接続されている。ＤＣ／ＤＣコントロ
ールＩＣ１３０は、デジタルトランジスタ１６０のオン
／オフ状態を検出して第１ＭＯＳＦＥＴ１１０のスイッ
チング動作を制御する。即ち、ＤＣ／ＤＣコントロール
ＩＣ１３０は、デジタルトランジスタ１６０のオン状態
では第１ＭＯＦＥＴ１１０をオフし、デジタルトランジ
スタ１６０のオフ状態では第１ＭＯＳＦＥＴ１１０をス
イッチングさせる。但し、第１ＭＯＳＦＥＴ１１０のス
イッチング動作において、第１ＭＯＳＦＥＴ１１０のオ
ン時間は保護回路２１０の規定時間未満である。The DC / DC control IC 130 has a power supply terminal connected to the battery 200 as a power supply line,
An SD (shutdown) terminal for controlling on / off of the / DC control IC 130 is a digital transistor 1
It is connected to 60 collectors. The DC / DC control IC 130 detects the ON / OFF state of the digital transistor 160 and controls the switching operation of the first MOSFET 110. That is, the DC / DC control IC 130 turns off the first MOSFET 110 when the digital transistor 160 is on, and switches the first MOSFET 110 when the digital transistor 160 is off. However, in the switching operation of the first MOSFET 110, the ON time of the first MOSFET 110 is shorter than the specified time of the protection circuit 210.
【００１５】電圧検出器１５０は、蓄電素子１０の端子
電圧Ｖｃに応じてデジタルトランジスタ１６０をオン／
オフする。電圧検出器１５０の反転入力側には基準電圧
Ｖrefが入力される。一方、電圧検出器１５０の非反転
入力側には、分圧回路Ｋが接続されている。分圧回路Ｋ
は、直列接続された抵抗Ｒ１と抵抗Ｒ２（ブリーダ抵
抗）で構成され、蓄電素子１０の端子電圧Ｖｃを抵抗Ｒ
１と抵抗Ｒ２で分圧し、分圧電圧Ｖｋとして出力する。
電圧検出器１５０は、分圧電圧Ｖｋと基準電圧Ｖrefを
比較する。分圧電圧Ｖｋが基準電圧Ｖref未満である場
合は、電圧検出器１５０からロウレベルの電圧が出力さ
れ、デジタルトランジスタ１６０をオフする。デジタル
トランジスタ１６０のオフ状態では、第２ＭＯＳＦＥＴ
１２０のソース電圧ＶS１とゲート電圧ＶG１が同電位に
保持されるため、第２ＭＯＳＦＥＴ１２０がオフ状態と
なって第２経路に電流が流れない一方、ＤＣ／ＤＣコン
トロールＩＣ１３０によって第１ＭＯＳＦＥＴ１１０の
スイッチングが開始され、第１経路で蓄電素子１０の間
欠充電が行われる。分圧電圧Ｖｋが基準電圧Ｖref以上
である場合は、電圧検出器１５０からハイレベルの電圧
が出力され、デジタルトランジスタ１６０をオンする。
デジタルトランジスタ１６０のオン状態では、第２ＭＯ
ＳＦＥＴ１２０のゲート電圧ＶG１がグランド電位とな
る。すると、第２ＭＯＳＦＥＴ１２０のゲート・ソース
間電圧が最大となって第２ＭＯＳＦＥＴ１２０がオン状
態となる一方、ＤＣ／ＤＣコントロールＩＣ１３０のＳ
Ｄ端子がグランド電位となってＤＣ／ＤＣコントロール
ＩＣ１３０が第１ＭＯＳＦＥＴ１１０のスイッチングを
停止し、第１ＭＯＳＦＥＴ１１０がオフ状態なる。これ
により、第１経路には電流が流れず、第２経路で蓄電素
子１０の連続充電が行われる。Voltage detector 150 turns on / off digital transistor 160 in accordance with terminal voltage Vc of power storage element 10.
Turn off. The reference voltage Vref is input to the inverting input side of the voltage detector 150. On the other hand, a voltage dividing circuit K is connected to the non-inverting input side of the voltage detector 150. Voltage dividing circuit K
Is composed of a resistor R1 and a resistor R2 (bleeder resistor) connected in series, and the terminal voltage Vc of the storage element 10 is
1 and a resistor R2, and output as a divided voltage Vk.
The voltage detector 150 compares the divided voltage Vk with the reference voltage Vref. When the divided voltage Vk is lower than the reference voltage Vref, a low-level voltage is output from the voltage detector 150, and the digital transistor 160 is turned off. When the digital transistor 160 is off, the second MOSFET
Since the source voltage V S1 and the gate voltage V G1 of the second MOSFET 120 are maintained at the same potential, the second MOSFET 120 is turned off and no current flows in the second path, while the switching of the first MOSFET 110 is performed by the DC / DC control IC 130. Is started, and the intermittent charging of the storage element 10 is performed in the first path. When the divided voltage Vk is equal to or higher than the reference voltage Vref, a high-level voltage is output from the voltage detector 150, and the digital transistor 160 is turned on.
When the digital transistor 160 is on, the second MO
The gate voltage V G1 of the SFET 120 becomes the ground potential. Then, the gate-source voltage of the second MOSFET 120 is maximized and the second MOSFET 120 is turned on, while the S / C of the DC / DC control IC 130 is turned on.
The D terminal becomes the ground potential, the DC / DC control IC 130 stops the switching of the first MOSFET 110, and the first MOSFET 110 is turned off. Thus, no current flows through the first path, and the electric storage element 10 is continuously charged through the second path.
【００１６】本実施形態では、蓄電素子１０の間欠充電
における第１スイッチング素子ＳＷ１（第１ＭＯＳＦＥ
Ｔ１１０）のオン時間を保護回路２１０の規定時間未満
としたが、これに限定されず、保護回路２１０が遮断動
作しないように第１スイッチング素子ＳＷ１（第１ＭＯ
ＳＦＥＴ１１０）のオン時間およびオフ時間を設定すれ
ばよい。例えば、電池２００と蓄電素子１０を接続して
から電源電流Ｉが保護回路２１０の過電流検出値を超え
るまでの時間ｔを予め調べ、第１スイッチング素子ＳＷ
１（第１ＭＯＳＦＥＴ１１０）オン時間を時間ｔ未満に
設定することもできる。なお電池２００から出力される
電源電流Ｉは蓄電素子１０の端子電圧Ｖｃに応じて変化
するので、時間ｔは一定でなくてもよく、例えば、充電
時間の経過または端子電圧Ｖｃの上昇に従ってオン時間
を長くするように構成してもよい。また本実施形態で
は、第２スイッチＳＷ２として第２ＭＯＳＦＥＴ１２０
を設けているので、第２ＭＯＳＦＥＴ１２０のオン抵抗
が抵抗２１となっているが、抵抗２１は０Ωであっても
よい。In the present embodiment, the first switching element SW1 (first MOSFET
Although the ON time of T110) is set to be shorter than the specified time of the protection circuit 210, the invention is not limited thereto.
The ON time and the OFF time of the SFET 110) may be set. For example, a time t from when the battery 200 is connected to the storage element 10 until the power supply current I exceeds the overcurrent detection value of the protection circuit 210 is checked in advance, and the first switching element SW
The ON time of the first (first MOSFET 110) can be set to less than the time t. Since power supply current I output from battery 200 changes according to terminal voltage Vc of power storage element 10, time t may not be constant. For example, on-time does not change as charging time elapses or terminal voltage Vc increases. May be configured to be longer. Further, in the present embodiment, the second MOSFET 120 is used as the second switch SW2.
Is provided, the on-resistance of the second MOSFET 120 is the resistance 21, but the resistance 21 may be 0Ω.
【００１７】以上のように本電源回路１００は、蓄電素
子１０の端子電圧Ｖｃが所定のしきい値未満である場合
には保護回路２１０が遮断動作しないように第１経路で
蓄電素子１０を間欠充電し、蓄電素子１０を連続充電し
ても保護回路２１０が遮断動作しない、蓄電素子１０の
端子電圧Ｖｃがしきい値以上である場合には間欠充電を
停止して第２経路で蓄電素子１０を連続充電するので、
蓄電素子１０の充電時に、電池２００の残量が十分ある
のに保護回路２１０が遮断動作することが無く、電池残
量がない・機器が故障したなどの誤認識を使用者に与え
ることもなくなる。しかも本電源回路１００は間欠充電
と連続充電を切換えるので、間欠充電だけで蓄電素子１
０を充電するよりも、第１スイッチング素子ＳＷ１のス
イッチングに伴うスイッチングノイズの発生を最小限に
抑えることができ、また充電時間の短縮を図ることがで
きる。さらに間欠充電をすることによって、保護回路２
１０の遮断動作を回避するための複雑な回路を設けなく
て済み、連続充電をすることによって、負荷３００が消
費する電流変動に柔軟に対応できる。As described above, when the terminal voltage Vc of the power storage element 10 is lower than the predetermined threshold, the power supply circuit 100 intermittently stores the power storage element 10 in the first path so that the protection circuit 210 does not perform the shut-off operation. Even if the battery is charged and the storage element 10 is continuously charged, the protection circuit 210 does not shut off. If the terminal voltage Vc of the storage element 10 is equal to or higher than the threshold value, the intermittent charging is stopped and the storage element 10 is Continuously charge
When the storage element 10 is charged, the protection circuit 210 does not shut off even though the battery 200 has sufficient remaining power, and does not give the user erroneous recognition that there is no remaining battery power or a device has failed. . In addition, the power supply circuit 100 switches between intermittent charging and continuous charging.
Rather than charging 0, generation of switching noise due to switching of the first switching element SW1 can be minimized, and charging time can be reduced. Furthermore, by performing intermittent charging, the protection circuit 2
There is no need to provide a complicated circuit for avoiding the breaking operation of the power supply 10, and the continuous charging allows a flexible response to the current fluctuation consumed by the load 300.
【００１８】以上の説明では、蓄電素子１０として電気
二重層コンデンサを使用しているが、これに限定されな
いのは勿論である。また本電源回路１００は、電子スチ
ルカメラなど負荷変動の大きい機器の電池に接続される
と、より効果を発揮する。In the above description, the electric storage device 10 is an electric double layer capacitor, but it is a matter of course that the present invention is not limited to this. Further, the power supply circuit 100 is more effective when connected to a battery of a device having a large load variation such as an electronic still camera.
【００１９】[0019]
【発明の効果】本発明によれば、蓄電素子の端子電圧が
所定のしきい値未満のときは、保護回路が遮断動作しな
いように第１スイッチ手段をスイッチングさせて第１経
路で蓄電素子を間欠充電し、蓄電素子の端子電圧が所定
のしきい値以上であるときには第１経路を迂回する第２
経路で蓄電素子を連続充電するので、蓄電素子の充電時
に保護回路が遮断動作することがなく、電池残量がない
・機器が故障したなどの誤認識を使用者に与えることも
なくなる。しかも間欠充電と連続充電を切換えるので、
間欠充電だけで蓄電素子を充電するよりも、第１スイッ
チ手段のスイッチングに伴うスイッチングノイズの発生
を最小限に抑えることができ、また充電時間の短縮を図
ることができる。According to the present invention, when the terminal voltage of the storage element is lower than the predetermined threshold value, the first switch is switched so that the protection circuit does not perform the shut-off operation, and the storage element is switched along the first path. When the intermittent charging is performed and the terminal voltage of the storage element is equal to or higher than a predetermined threshold,
Since the storage element is continuously charged through the path, the protection circuit does not shut off when the storage element is charged, and the user is not erroneously recognized that there is no remaining battery power or the device has failed. Moreover, since it switches between intermittent charging and continuous charging,
Rather than charging the storage element only by intermittent charging, it is possible to minimize the occurrence of switching noise due to the switching of the first switch means, and to shorten the charging time.
【図１】 本発明を適用した電源回路の概要をブロック
で示す図である。FIG. 1 is a block diagram showing an outline of a power supply circuit to which the present invention is applied.
【図２】 同電源回路の充電制御処理に関するフローチ
ャートである。FIG. 2 is a flowchart relating to a charge control process of the power supply circuit.
【図３】 同電源回路の一実施例を示す回路図である。FIG. 3 is a circuit diagram showing one embodiment of the power supply circuit.
１００ 電源回路 １０ 蓄電素子 ２０ 電流制限部 ２１ 抵抗 ３０ 充電制御回路 ４０ スイッチングコントローラ ５０ バックアップ用電池 １１０ 第１ＭＯＳＦＥＴ １２０ 第２ＭＯＳＦＥＴ １３０ ＤＣ／ＤＣコントロールＩＣ １４０ コンデンサ １５０ 電圧検出器 １６０ デジタルトランジスタ ２００ 電池 ２１０ 保護回路 ３００ 負荷 ＳＷ１ 第１スイッチング素子 ＳＷ２ 第２スイッチ REFERENCE SIGNS LIST 100 power supply circuit 10 power storage element 20 current limiting unit 21 resistor 30 charging control circuit 40 switching controller 50 backup battery 110 first MOSFET 120 second MOSFET 130 DC / DC control IC 140 capacitor 150 voltage detector 160 digital transistor 200 battery 210 protection circuit 300 Load SW1 First switching element SW2 Second switch
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5G003 AA04 BA01 CA14 CA18 CC07 DA06 GA01 GC05 5H030 AA08 AS06 BB21 FF44 5H410 BB04 CC02 DD02 EA11 EA37 EB01 FF03 FF25 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G003 AA04 BA01 CA14 CA18 CC07 DA06 GA01 GC05 5H030 AA08 AS06 BB21 FF44 5H410 BB04 CC02 DD02 EA11 EA37 EB01 FF03 FF25
Claims (4)
間以上連続して出力されたことを検知すると該出力を遮
断する保護回路を備えた電池に接続される電源回路にお
いて、 蓄電素子と、 前記電池と前記蓄電素子を接続する第１経路に設けた第
１スイッチ手段と、 前記蓄電素子の端子電圧が所定のしきい値未満のとき
は、前記保護回路が遮断動作しないように前記第１スイ
ッチ手段をスイッチングさせて前記第１経路で前記蓄電
素子を間欠充電し、前記蓄電素子の端子電圧が前記所定
のしきい値以上であるときには、前記第１経路を迂回す
る第２経路で前記電池と前記蓄電素子とを接続して前記
蓄電素子を連続充電する充電制御手段と、を備えたこと
を特徴とする電源回路。1. A power supply circuit connected to a battery provided with a protection circuit for shutting off output when a current equal to or greater than a predetermined overcurrent detection value is continuously output for a specified time or more. A first switch provided in a first path connecting the battery and the power storage element; and a second switch configured to prevent the protection circuit from shutting off when a terminal voltage of the power storage element is lower than a predetermined threshold value. One switch means is switched to intermittently charge the power storage element on the first path, and when the terminal voltage of the power storage element is equal to or higher than the predetermined threshold, the second path bypasses the first path. A power supply circuit, comprising: charge control means for connecting a battery and the power storage element to continuously charge the power storage element.
第２経路には第２スイッチ手段が設けられ、 前記充電制御手段は、前記蓄電素子の端子電圧が所定の
しきい値未満である場合は、前記第２スイッチ手段をオ
フした状態で前記第１スイッチ手段を前記保護回路が遮
断動作しないようにオン／オフさせて前記第１経路で前
記蓄電素子を間欠充電し、前記蓄電素子の端子電圧が前
記しきい値以上である場合には前記第１スイッチ手段を
オフした状態で前記第２スイッチ手段をオンさせて前記
第２経路で前記蓄電素子を充電する電源回路。2. The power supply circuit according to claim 1, wherein a second switch is provided in the second path, and the charge controller is configured to determine that a terminal voltage of the power storage element is lower than a predetermined threshold. Turning on / off the first switch means so that the protection circuit does not shut off while the second switch means is off, intermittently charging the power storage element on the first path, and connecting the terminal of the power storage element A power supply circuit that, when the voltage is equal to or higher than the threshold, turns on the second switch in a state where the first switch is turned off, and charges the power storage element through the second path;
て、前記蓄電素子の間欠充電における前記第１スイッチ
手段のオン時間は、前記保護回路の規定時間未満である
電源回路。3. The power supply circuit according to claim 1, wherein an on-time of said first switch means during intermittent charging of said storage element is shorter than a prescribed time of said protection circuit.
て、前記蓄電素子の間欠充電における前記第１スイッチ
手段のオン時間は、前記蓄電素子の充電に伴い減少する
前記電池の出力が前記過電流検出値を超えない時間であ
る電源回路。4. The power supply circuit according to claim 1, wherein the on-time of the first switch means in the intermittent charging of the storage element decreases as the output of the battery decreases with the charging of the storage element. Power supply circuit that is a time that does not exceed the detection value.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000113509A JP4043688B2 (en) | 2000-04-14 | 2000-04-14 | Power circuit |
| US09/828,940 US6798175B2 (en) | 2000-04-11 | 2001-04-10 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000113509A JP4043688B2 (en) | 2000-04-14 | 2000-04-14 | Power circuit |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2001296928A true JP2001296928A (en) | 2001-10-26 |
| JP2001296928A5 JP2001296928A5 (en) | 2005-06-16 |
| JP4043688B2 JP4043688B2 (en) | 2008-02-06 |
Family
ID=18625458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000113509A Expired - Fee Related JP4043688B2 (en) | 2000-04-11 | 2000-04-14 | Power circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4043688B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007236012A (en) * | 2005-03-18 | 2007-09-13 | Ricoh Co Ltd | Power supply switch circuit |
| JP2011193598A (en) * | 2010-03-12 | 2011-09-29 | Mitsubishi Motors Corp | Control method and controller of dc/dc converter |
| JP2012182857A (en) * | 2011-02-10 | 2012-09-20 | Shin Kobe Electric Mach Co Ltd | Dc power supply |
| JP2017508432A (en) * | 2014-02-26 | 2017-03-23 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Battery system and method for driving battery system |
| WO2017187867A1 (en) * | 2016-04-27 | 2017-11-02 | 株式会社オートネットワーク技術研究所 | Power supply device |
| CN110940937A (en) * | 2014-11-04 | 2020-03-31 | 意法半导体股份有限公司 | Detection circuit, related active discharge circuit, integrated circuit and method |
-
2000
- 2000-04-14 JP JP2000113509A patent/JP4043688B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007236012A (en) * | 2005-03-18 | 2007-09-13 | Ricoh Co Ltd | Power supply switch circuit |
| JP2011193598A (en) * | 2010-03-12 | 2011-09-29 | Mitsubishi Motors Corp | Control method and controller of dc/dc converter |
| JP2012182857A (en) * | 2011-02-10 | 2012-09-20 | Shin Kobe Electric Mach Co Ltd | Dc power supply |
| JP2017508432A (en) * | 2014-02-26 | 2017-03-23 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Battery system and method for driving battery system |
| CN110940937A (en) * | 2014-11-04 | 2020-03-31 | 意法半导体股份有限公司 | Detection circuit, related active discharge circuit, integrated circuit and method |
| WO2017187867A1 (en) * | 2016-04-27 | 2017-11-02 | 株式会社オートネットワーク技術研究所 | Power supply device |
| JP2017200306A (en) * | 2016-04-27 | 2017-11-02 | 株式会社オートネットワーク技術研究所 | Power supply |
| US20190097277A1 (en) * | 2016-04-27 | 2019-03-28 | Autonetworks Technologies, Ltd. | Power source device |
| US10749217B2 (en) | 2016-04-27 | 2020-08-18 | Autonetworks Technologies, Ltd. | Power source device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4043688B2 (en) | 2008-02-06 |
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