JP3427341B2 - Charge control circuit - Google Patents
Charge control circuitInfo
- Publication number
- JP3427341B2 JP3427341B2 JP08234897A JP8234897A JP3427341B2 JP 3427341 B2 JP3427341 B2 JP 3427341B2 JP 08234897 A JP08234897 A JP 08234897A JP 8234897 A JP8234897 A JP 8234897A JP 3427341 B2 JP3427341 B2 JP 3427341B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- lithium
- ion battery
- charging
- 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.)
- Expired - Lifetime
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 32
- 229910001416 lithium ion Inorganic materials 0.000 claims description 32
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 1
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
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は初期充電電流を所
定範囲内に押さえる充電制御回路に係わり、特に、電話
機に好適な充電制御回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge control circuit for suppressing an initial charge current within a predetermined range, and more particularly to a charge control circuit suitable for a telephone.
【０００２】[0002]
【従来の技術】リチウムイオン電池は保存によって０Ｖ
近くまで低下する場合がある。電池電圧が低下した電池
を急速充電すると、保護回路のＦＥＴ（電界効果トラン
ジスタ）が発熱する可能性があるので、電池電圧が低下
している場合を考慮して充電電流を所定範囲内に押さえ
る予備充電を行い、電池電圧が３Ｖ以上となったら急速
充電を行う充電システムが必要である。2. Description of the Prior Art Lithium-ion batteries are stored at 0 V
It may drop to near. If a battery with a low battery voltage is rapidly charged, the FET (field effect transistor) of the protection circuit may generate heat. Therefore, consider a case where the battery voltage is low and keep the charging current within the specified range. It is necessary to have a charging system that charges the battery and performs rapid charging when the battery voltage becomes 3 V or higher.
【０００３】従来の電話機に用いられていた充電システ
ムの例を図３に示す。電話機２４には電話機回路１０と
リチウムイオン電池２が備えられている。充電器２１は
定電圧・定電流回路１、予備充電回路３、充電回路４お
よびマイクロコンピュータ１１を備えている。An example of a charging system used in a conventional telephone is shown in FIG. The telephone 24 is provided with the telephone circuit 10 and the lithium-ion battery 2. The charger 21 includes a constant voltage / constant current circuit 1, a preliminary charging circuit 3, a charging circuit 4 and a microcomputer 11.
【０００４】定電圧・定電流回路１から供給される電流
は予備充電回路３または充電回路４を介してリチウムイ
オン電池２に供給されリチウムイオン電池２が充電され
る。マイクロコンピュータ１１はリチウムイオン電池２
の電圧を検出し、所定電圧となるまでは充電回路４から
の電流供給を停止させ、予備充電回路３から所定範囲内
に押さえられた電流を供給させる。The current supplied from the constant voltage / constant current circuit 1 is supplied to the lithium ion battery 2 via the preliminary charging circuit 3 or the charging circuit 4 to charge the lithium ion battery 2. The microcomputer 11 is a lithium-ion battery 2
Is detected, the current supply from the charging circuit 4 is stopped until the voltage reaches a predetermined voltage, and the current held within the predetermined range is supplied from the preliminary charging circuit 3.
【０００５】リチウムイオン電池２の電圧が所定電圧以
上になると、マイクロコンピュータ１１は予備充電回路
３からの電流供給を停止させ、充電回路４から電流を供
給させて急速充電を行わせる。そして、リチウムイオン
電池２の電圧が必要充電電圧となると充電回路４からの
電流供給を停止させる。予備充電回路３からの電流供給
が一定の期間継続してもリチウムイオン電池２の電圧が
所定電圧に達しないときは充電を停止して電池保護を行
う。When the voltage of the lithium-ion battery 2 exceeds a predetermined voltage, the microcomputer 11 stops the current supply from the preliminary charging circuit 3 and supplies the current from the charging circuit 4 to perform quick charging. Then, when the voltage of the lithium-ion battery 2 reaches the required charging voltage, the current supply from the charging circuit 4 is stopped. If the voltage of the lithium-ion battery 2 does not reach the predetermined voltage even if the current supply from the pre-charging circuit 3 continues for a certain period, charging is stopped to protect the battery.
【０００６】このような充電システムでは、充電器２１
にマイクロコンピュータを備え充電制御を行うため構成
が複雑となり、充電器２１の製造コストが高くなるとい
う問題があった。In such a charging system, the charger 21
In addition, there is a problem in that the structure is complicated because a microcomputer is provided and charging control is performed, and the manufacturing cost of the charger 21 increases.
【０００７】そこで、電話機本体内に備えられたマイク
ロコンピュータにより充電制御を行うシステムが用いら
れていた。そのような充電制御システムの例を図４に示
す。図に示す充電器２２は定電圧・定電流回路１を備え
ており、電話機２５に電流を供給する。電話機２５には
電話機回路１０、リチウムイオン電池２、充電回路１３
およびマイクロコンピュータ１２を備えている。Therefore, a system in which charging control is performed by a microcomputer provided in the telephone body has been used. An example of such a charging control system is shown in FIG. The charger 22 shown in the figure includes a constant voltage / constant current circuit 1, and supplies current to the telephone 25. The telephone 25 includes a telephone circuit 10, a lithium-ion battery 2, and a charging circuit 13.
And a microcomputer 12.
【０００８】マイクロコンピュータ１２はリチウムイオ
ン電池２の電圧を検出し、所定電圧となるまでは充電回
路１３から所定範囲内に押さえられた電流を供給させ、
所定電圧以上となると充電回路１３から大電流を供給さ
せて急速充電を行わせる。そして、リチウムイオン電池
２の電圧が必要充電電圧となると充電回路１３からの電
流供給を停止させる。The microcomputer 12 detects the voltage of the lithium-ion battery 2 and causes the charging circuit 13 to supply a current suppressed within a predetermined range until the voltage reaches a predetermined voltage.
When the voltage becomes equal to or higher than the predetermined voltage, a large current is supplied from the charging circuit 13 to perform quick charging. Then, when the voltage of the lithium-ion battery 2 reaches the required charging voltage, the current supply from the charging circuit 13 is stopped.
【０００９】[0009]
【発明が解決しようとする課題】上記した図４に示す従
来の充電制御システムでは、マイクロコンピュータ１２
の電源がリチウムイオン電池２となっているため、リチ
ウムイオン電池２の電圧がマイクロコンピュータ１２の
作動電圧以下に低下している場合は、充電制御が不可能
となるという問題があった。In the conventional charging control system shown in FIG. 4, the microcomputer 12 is used.
Since the power source is the lithium ion battery 2, there is a problem that the charge control becomes impossible when the voltage of the lithium ion battery 2 is lower than the operating voltage of the microcomputer 12.
【００１０】この発明は上記した点に鑑みてなされたも
のであって、その目的とするところは、充電器の製造コ
ストを安くし、しかも、リチウムイオン電池の電圧が電
話機本体に備えられたマイクロコンピュータの作動電圧
以下に低下した場合も制御可能な充電制御回路を提供す
ることにある。The present invention has been made in view of the above points, and it is an object of the present invention to reduce the manufacturing cost of a charger, and further, the voltage of a lithium-ion battery is provided in a telephone body. Another object of the present invention is to provide a charge control circuit that can control even when the voltage drops below the operating voltage of a computer.
【００１１】[0011]
【課題を解決するための手段】この発明の充電制御回路
は、電話機回路と、リチウムイオン電池と、マイクロコ
ンピュータと、充電回路と、予備充電回路と、充電器を
電源としてマイクロコンピュータ動作電圧以下で動作可
能なタイマーＩＣとを電話機本体に備え、電話機本体に
充電器が接続されると、前記タイマーＩＣがタイマー動
作を開始して前記予備充電回路により所定範囲内に制限
された電流でリチウムイオン電池の初期充電を行い、リ
チウムイオン電池が所定電圧に充電されると、前記マイ
クロコンピュータが作動して前記充電回路を制御し急速
充電を行わせることによりマイクロコンピュータ動作不
可能な電圧に低下したリチウムイオン電池を充電するよ
うに構成したものである。A charging control circuit of the present invention uses a telephone circuit, a lithium-ion battery, a microcomputer, a charging circuit, a precharging circuit, and a charger as a power source at a voltage lower than a microcomputer operating voltage. An operable timer IC is provided in the main body of the telephone, and when a charger is connected to the main body of the telephone, the timer IC starts the timer operation, and the lithium-ion battery is supplied with a current limited within a predetermined range by the preliminary charging circuit. When the lithium-ion battery is charged to a predetermined voltage after the initial charging of, the microcomputer operates to control the charging circuit to perform the rapid charging, thereby reducing the voltage to a voltage at which the microcomputer cannot operate. It is configured to charge a battery.
【００１２】また、前記充電制御回路において、前記予
備充電回路からの電流供給が前記タイマーＩＣで設定さ
れた期間継続しても前記リチウムイオン電池の電圧が所
定電圧に達しないときは前記予備充電回路の電流供給を
停止させるように構成したものである。Further, in the charge control circuit, if the voltage of the lithium ion battery does not reach a predetermined voltage even if the current supply from the precharge circuit continues for a period set by the timer IC, the precharge circuit. The current supply is stopped.
【００１３】[0013]
【発明の実施の形態】この発明の実施例である電話機の
充電制御回路の例を図面に基づいて説明する。図１はこ
の発明の実施例である電話機の充電制御回路を示すブロ
ック図である。図に示す充電器２０は定電圧・定電流回
路１を備えており、電話機２３に電流を供給する。電話
機２３には電話機回路１０、リチウムイオン電池２、マ
イクロコンピュータ５、充電回路４、予備充電回路３お
よびタイマーＩＣ６を備えている。BEST MODE FOR CARRYING OUT THE INVENTION An example of a charging control circuit of a telephone which is an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a charging control circuit of a telephone which is an embodiment of the present invention. The charger 20 shown in the figure includes a constant voltage / constant current circuit 1 and supplies a current to the telephone 23. The telephone 23 includes a telephone circuit 10, a lithium-ion battery 2, a microcomputer 5, a charging circuit 4, a preliminary charging circuit 3 and a timer IC 6.
【００１４】定電圧・定電流回路１は図２に示す電流・
電圧特性を有する。すなわち、負荷の電圧がＶ0 （４．
１Ｖ）に達するまでは定電流回路として一定電流（２０
０ｍＩ）を供給し、負荷の電圧がＶ0 （４．１Ｖ）に達
すると定電圧回路として動作する。The constant voltage / constant current circuit 1 has the current
It has voltage characteristics. That is, the load voltage is V 0 (4.
A constant current (20V)
0 mI) is supplied and when the load voltage reaches V 0 (4.1 V), it operates as a constant voltage circuit.
【００１５】定電圧・定電流回路１から供給される電流
は予備充電回路３または充電回路４を介してリチウムイ
オン電池２に供給されリチウムイオン電池２が充電され
る。タイマーＩＣ６は充電器２０により電源が供給され
るがマイクロコンピュータ５の作動電圧（３Ｖ）以下で
作動する。タイマーＩＣ６は充電器２０が接続されたこ
とを充電器２０の出力電圧で検出しタイマー動作を開始
して所定期間予備充電回路を制御して所定範囲内の電流
をリチウムイオン電池２に供給させて予備充電させる。The current supplied from the constant voltage / constant current circuit 1 is supplied to the lithium ion battery 2 via the preliminary charging circuit 3 or the charging circuit 4 to charge the lithium ion battery 2. The timer IC 6 is powered by the charger 20, but operates at an operating voltage (3 V) or less of the microcomputer 5. The timer IC 6 detects that the charger 20 is connected from the output voltage of the charger 20 and starts a timer operation to control the preliminary charging circuit for a predetermined period to supply a current within a predetermined range to the lithium ion battery 2. Pre-charge.
【００１６】マイクロコンピュータ５はリチウムイオン
電池２の電圧を検出し、所定電圧に達すると作動するよ
うになり、タイマーＩＣ６の作動を停止さて予備充電回
路３の電流供給を停止させると共に充電回路４を制御し
て急速充電させる。そして、リチウムイオン電池２の電
圧が必要充電電圧となると充電回路４からの電流供給を
停止させる。The microcomputer 5 detects the voltage of the lithium-ion battery 2 and is activated when it reaches a predetermined voltage. The timer IC 6 is deactivated to stop the current supply of the preliminary charging circuit 3 and the charging circuit 4 is activated. Control to charge quickly. Then, when the voltage of the lithium-ion battery 2 reaches the required charging voltage, the current supply from the charging circuit 4 is stopped.
【００１７】予備充電回路３からの電流供給がタイマー
ＩＣ６で設定された期間継続してもリチウムイオン電池
２の電圧が所定電圧に達しないときはマイクロコンピュ
ータ５はタイマーＩＣ６に指令して予備充電回路３の電
流供給を停止させて電池保護をする。If the voltage of the lithium-ion battery 2 does not reach the predetermined voltage even if the current supply from the pre-charging circuit 3 continues for the period set by the timer IC 6, the microcomputer 5 instructs the timer IC 6 to pre-charging circuit. The current supply of 3 is stopped to protect the battery.
【００１８】[0018]
【発明の効果】この発明の充電制御回路によれば、充電
器の製造コストを安くし、しかも、リチウムイオン電池
の電圧が電話機本体に備えられたマイクロコンピュータ
の作動電圧以下に低下した場合も充電制御可能となる。According to the charge control circuit of the present invention, the manufacturing cost of the charger is reduced, and even when the voltage of the lithium-ion battery drops below the operating voltage of the microcomputer provided in the telephone body, it is charged. It becomes controllable.
【図１】この発明の実施例である電話機の充電制御回路
を示すブロック図である。FIG. 1 is a block diagram showing a charging control circuit of a telephone which is an embodiment of the present invention.
【図２】同充電制御回路に用いられる定電圧・定電流回
路の電圧・電流の変化を示すタイムチャートである。FIG. 2 is a time chart showing changes in voltage / current of a constant voltage / constant current circuit used in the charge control circuit.
【図３】従来の電話機の充電制御回路の例を示すブロッ
ク図である。FIG. 3 is a block diagram showing an example of a charge control circuit of a conventional telephone.
【図４】従来の電話機の充電制御回路の他の例を示すブ
ロック図である。FIG. 4 is a block diagram showing another example of a conventional charging control circuit of a telephone.
１ 定電圧・定電流回路 ２ リチウムイオン電池 ３ 予備充電回路 ４ 充電回路 ５ マイクロコンピュータ ６ タイマーＩＣ １０ 電話機回路 １１、１２ マイクロコンピュータ １３ 充電回路 ２０、２１、２２ 充電器 ２３、２４、２５ 電話機 1 constant voltage / current circuit 2 Lithium-ion battery 3 Pre-charging circuit 4 charging circuit 5 Microcomputer 6 timer IC 10 Telephone circuit 11, 12 Microcomputer 13 Charging circuit 20, 21, 22 charger 23, 24, 25 telephones
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−37699（ＪＰ，Ａ) 特開 平７−59270（ＪＰ，Ａ) 特開 平１−291639（ＪＰ，Ａ) 特開 平９−163623（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02J 7/10 H01M 10/40 - 10/44 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-37699 (JP, A) JP-A-7-59270 (JP, A) JP-A-1-291639 (JP, A) JP-A-9- 163623 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H02J 7/10 H01M 10/40-10/44
Claims (2)
マイクロコンピュータと、充電回路と、予備充電回路
と、充電器を電源としてマイクロコンピュータ動作電圧
以下で動作可能なタイマーＩＣとを電話機本体に備え、
電話機本体に充電器が接続されると、前記タイマーＩＣ
がタイマー動作を開始して前記予備充電回路により所定
範囲内に制限された電流でリチウムイオン電池の初期充
電を行い、リチウムイオン電池が所定電圧に充電される
と、前記マイクロコンピュータが作動して前記充電回路
を制御し急速充電を行わせることによりマイクロコンピ
ュータ動作不可能な電圧に低下したリチウムイオン電池
を充電するように構成した充電制御回路。1. A telephone circuit, a lithium-ion battery,
The telephone body is provided with a microcomputer, a charging circuit, a pre-charging circuit, and a timer IC that can operate at a microcomputer operating voltage or less using a charger as a power source,
When the charger is connected to the phone body, the timer IC
Starts a timer operation to initially charge the lithium-ion battery with a current limited within a predetermined range by the preliminary charging circuit, and when the lithium-ion battery is charged to a predetermined voltage, the microcomputer operates and the A charge control circuit configured to charge a lithium-ion battery that has dropped to a voltage at which a microcomputer cannot operate by controlling the charging circuit to perform rapid charging.
タイマーＩＣで設定された期間継続しても前記リチウム
イオン電池の電圧が所定電圧に達しないときは前記予備
充電回路の電流供給を停止させるように構成した請求項
１の充電制御回路。2. The current supply from the preliminary charging circuit is stopped when the voltage of the lithium ion battery does not reach a predetermined voltage even if the current supply from the preliminary charging circuit continues for a period set by the timer IC. The charge control circuit according to claim 1, configured as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08234897A JP3427341B2 (en) | 1997-03-14 | 1997-03-14 | Charge control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08234897A JP3427341B2 (en) | 1997-03-14 | 1997-03-14 | Charge control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10257687A JPH10257687A (en) | 1998-09-25 |
| JP3427341B2 true JP3427341B2 (en) | 2003-07-14 |
Family
ID=13772073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08234897A Expired - Lifetime JP3427341B2 (en) | 1997-03-14 | 1997-03-14 | Charge control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3427341B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013172529A (en) * | 2012-02-20 | 2013-09-02 | Nec Access Technica Ltd | Charger and charging method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6824920B1 (en) | 1997-06-03 | 2004-11-30 | Matsushita Electric Industrial Co., Ltd. | Non-aqueous electrolyte secondary battery comprising composite particles |
| US6653019B1 (en) | 1998-06-03 | 2003-11-25 | Matsushita Electric Industrial Co., Ltd. | Non-aqueous electrolyte secondary cell |
| US6821675B1 (en) | 1998-06-03 | 2004-11-23 | Matsushita Electric Industrial Co., Ltd. | Non-Aqueous electrolyte secondary battery comprising composite particles |
| US6506520B1 (en) * | 1998-12-02 | 2003-01-14 | Matsushita Electric Industrial Co., Ltd. | Non-aqueous electrolyte secondary battery |
| EP1052712B1 (en) | 1998-12-02 | 2010-02-24 | Panasonic Corporation | Non-aqueous electrolyte secondary cell |
| SE514722C2 (en) * | 1999-01-27 | 2001-04-09 | Ericsson Telefon Ab L M | Method and apparatus for charging a battery-powered device |
| JP5162188B2 (en) * | 2007-08-31 | 2013-03-13 | 京セラ株式会社 | Mobile communication terminal, startup method, and boot program |
-
1997
- 1997-03-14 JP JP08234897A patent/JP3427341B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013172529A (en) * | 2012-02-20 | 2013-09-02 | Nec Access Technica Ltd | Charger and charging method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10257687A (en) | 1998-09-25 |
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