JP4597162B2 - Charge control circuit and equipment - Google Patents

Charge control circuit and equipment Download PDF

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JP4597162B2
JP4597162B2 JP2007131095A JP2007131095A JP4597162B2 JP 4597162 B2 JP4597162 B2 JP 4597162B2 JP 2007131095 A JP2007131095 A JP 2007131095A JP 2007131095 A JP2007131095 A JP 2007131095A JP 4597162 B2 JP4597162 B2 JP 4597162B2
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control circuit
secondary battery
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JP2008289265A (en
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修司 石倉
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Mitsubishi Electric Corp
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    • 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
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    • Y02E60/10—Energy storage using batteries

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Description

本発明は、携帯電話等の機器に内蔵された二次電池の充電を行う充電制御技術に関する。 The present invention relates to a charge control technique for charging a secondary battery built in a device such as a mobile phone.

従来から、携帯電話等の携帯機器には、内蔵された二次電池の充電を外部から供給された電力で行う充電制御回路が備えられている。   2. Description of the Related Art Conventionally, a mobile device such as a mobile phone has been provided with a charge control circuit that charges a built-in secondary battery with power supplied from the outside.

図５は、従来の充電制御回路の概略構成を示すブロック図である。充電制御回路１は、二次電池３に充電電流Ｉ３を供給する回路である。図５に於いて、充電制御回路１は、外部電源２〜二次電池３間に挿入された充電スイッチ４と、充電電圧を検出し充電スイッチ４を制御する定電圧定電流制御回路５と、逆流防止素子６と、充電電流検出用抵抗７と、その端子間電圧によって充電電流Ｉ３を検出する充電電流検出回路８とから構成されている。そして、充電制御回路１は、二次電池３と充電電流検出用抵抗７との間の節点より電力を取り出して、取り出した電力を装置各部へ供給している。又、装置本体と二次電池３とは、コネクタを介して接続されている。   FIG. 5 is a block diagram showing a schematic configuration of a conventional charge control circuit. The charging control circuit 1 is a circuit that supplies a charging current I3 to the secondary battery 3. In FIG. 5, the charge control circuit 1 includes a charge switch 4 inserted between the external power source 2 and the secondary battery 3, a constant voltage constant current control circuit 5 that detects the charge voltage and controls the charge switch 4, The circuit includes a backflow prevention element 6, a charging current detection resistor 7, and a charging current detection circuit 8 that detects the charging current I3 based on the voltage across the terminals. The charging control circuit 1 extracts power from a node between the secondary battery 3 and the charging current detection resistor 7 and supplies the extracted power to each part of the apparatus. Further, the apparatus main body and the secondary battery 3 are connected via a connector.

上記構成において、外部電源２から電力が供給されると、定電圧定電流制御回路５により充電スイッチ４がオンされ、充電電流Ｉ３が流れる。その充電電流Ｉ３により生じた充電電流検出用抵抗７の端子間電圧を充電電流検出回路８で検出し、定電圧定電流制御回路５により、充電スイッチ４が制御され定電流充電制御を行う。次に、電池電圧が規定値に達すると、定電圧定電流制御回路５により充電スイッチ４が制御されて定電圧充電制御に切換る。その後、徐々に充電電流Ｉ３が減少し規定値以下になると、定電圧定電流制御回路５により充電スイッチ４がオフされ、充電が完了する。充電中及び非充電中に関係なく、装置各部への電力供給は、二次電池３と充電電流検出用抵抗７との間より取り出されている（例えば、特許文献１参照。）。   In the above configuration, when power is supplied from the external power supply 2, the charging switch 4 is turned on by the constant voltage / constant current control circuit 5, and the charging current I3 flows. The voltage between the terminals of the charging current detecting resistor 7 generated by the charging current I3 is detected by the charging current detecting circuit 8, and the constant voltage / constant current control circuit 5 controls the charging switch 4 to perform constant current charging control. Next, when the battery voltage reaches a specified value, the constant voltage / constant current control circuit 5 controls the charge switch 4 to switch to constant voltage charge control. After that, when the charging current I3 gradually decreases and becomes a specified value or less, the charging switch 4 is turned off by the constant voltage / constant current control circuit 5 and the charging is completed. Regardless of charging or non-charging, power supply to each part of the apparatus is taken out between the secondary battery 3 and the charging current detection resistor 7 (see, for example, Patent Document 1).

図６は、図５の充電制御回路に加えて、装置各部〜二次電池３間に挿入された装置電流検出用抵抗９と、その端子間電圧によって装置電流Ｉ２を検出する装置電流検出回路１０とで構成されている。   6 shows, in addition to the charging control circuit of FIG. 5, a device current detection resistor 9 inserted between each part of the device and the secondary battery 3, and a device current detection circuit 10 for detecting the device current I2 by the voltage between the terminals. It consists of and.

上記構成において、充電電流Ｉ３と装置各部で消費される装置電流Ｉ２とを検出し、（充電電流Ｉ３−装置電流Ｉ２）より、二次電池３へ流れる充電電流Ｉ１を算出している（例えば、特許文献２参照）。   In the above configuration, the charging current I3 and the device current I2 consumed by each part of the device are detected, and the charging current I1 flowing to the secondary battery 3 is calculated from (charging current I3−device current I2) (for example, Patent Document 2).

特開２００５−２７８３０２号公報JP-A-2005-278302 特開２００６−２５４５６０号公報JP 2006-254560 A

図５の従来の充電制御回路では、上記の様に装置各部への電力を二次電池と充電電流検出用抵抗との間より取り出しているため、充電電流検出回路で検出される充電電流は、装置各部で消費される装置電流を含んでおり、二次電池へ流れる電流を正確に検出することが出来ない。そのため、装置電流が大きい場合には、充電電流が規定値以下にならず、充電が完了しないという問題点があった。   In the conventional charge control circuit of FIG. 5, since the power to each part of the apparatus is taken out between the secondary battery and the charge current detection resistor as described above, the charge current detected by the charge current detection circuit is The device current consumed by each part of the device is included, and the current flowing to the secondary battery cannot be accurately detected. For this reason, when the apparatus current is large, the charging current does not fall below a specified value, and charging is not completed.

又、図６に示す従来の充電制御回路では、上記の通り装置各部〜二次電池間に装置電流検出用抵抗が挿入されているため、二次電池へ流れる充電電流を正確に検出することが出来るが、非充電時には、装置電流検出用抵抗により電圧ロスが発生してしまう。そのため、二次電池の消耗が早くなってしまうという問題点があった。   In the conventional charge control circuit shown in FIG. 6, since the device current detection resistor is inserted between each part of the device and the secondary battery as described above, the charging current flowing to the secondary battery can be accurately detected. However, a voltage loss occurs due to the device current detection resistor during non-charging. For this reason, there is a problem that the secondary battery is consumed quickly.

そこで、本発明は、斯かる技術状況に鑑みて、装置各部で電流が消費されている場合でも、二次電池へ流れる充電電流を正確に検出することが出来、且つ、非充電時には、二次電池から電圧ロス無く電力を装置各部へ供給することが可能な充電制御回路を提供することを、その目的としている。   Therefore, in view of such a technical situation, the present invention can accurately detect the charging current flowing to the secondary battery even when current is consumed in each part of the device, and at the time of non-charging, An object of the present invention is to provide a charge control circuit capable of supplying power from a battery to each part of the apparatus without voltage loss.

この発明の主題は、機器に内蔵された二次電池に充電電流を供給するための充電制御回路であって、前記機器の外部電源にその一端が接続された充電スイッチと、前記充電スイッチの他端に接続された第１端子、及び、コネクタを介して前記二次電池に接続されると共に前記機器の装置各部に装置電流を供給するための信号線の一端が接続された前記充電制御回路用基板上の第１節点に接続された第２端子を有する逆流防止素子と、前記装置各部で消費される装置電流Ｉ２に加えて定電流Ｉ４を発生させる定電流負荷回路と、前記第１節点に接続された第１入力端子及び前記コネクタを介して前記第１節点に接続される前記二次電池側の第２節点に接続される第２入力端子を有しており、前記装置電流Ｉ２のみを流したときの前記第１接点と前記第２接点との間の電位差ΔＶ２と、前記装置電流Ｉ２と前記定電流Ｉ４とを流したときの前記第１接点と前記第２接点との間の電位差ΔＶ２４とを検出し、前記電位差ΔＶ２、前記電位差ΔＶ２４及び前記定電流Ｉ４の値に基づいて前記第１節点と前記第２節点間のロスを充電電流検出用抵抗として検出するロス検出回路と、前記第１節点に接続された第１入力端子、前記第２節点に接続される第２入力端子及び前記ロス検出回路の出力端子に接続された第３入力端子を有しており、前記ロス検出回路が検出した前記第１節点と前記第２節点間の前記ロスを使用して前記第１節点と前記第２節点間に流れる前記二次電池の前記充電電流を検出する充電電流検出回路と、前記第１節点に接続された第１入力端子、前記充電電流検出回路の出力端子に接続された第２入力端子及び前記充電スイッチの制御端子に接続された出力端子を有しており、前記ロス検出回路による前記第１節点と前記第２節点間の前記ロスの検出後に、前記充電スイッチをオン状態に制御して前記逆流防止素子を介して前記第１節点と前記第２節点間に前記二次電池の前記充電電流を流し、前記充電電流検出回路で検出された前記充電電流の値に基づき前記充電スイッチを制御して定電流充電制御を行うと共に、前記第１節点の充電電圧が第１規定値以上となったか否かを判定して前記第１節点の前記充電電圧が前記第１規定値に達したときには前記充電スイッチを制御して定電圧充電制御を行い、定電圧充電制御後に前記充電電流検出回路で検出された前記充電電流の値が第２規定値以下になったときには前記充電スイッチをオフ状態に制御する定電圧定電流制御回路とを備えたことを特徴とする。

The subject of the present invention is a charge control circuit for supplying a charging current to a secondary battery incorporated in a device , the charge switch having one end connected to an external power source of the device , and other than the charge switch the first terminal is connected to the end, and, for the charge control circuit to which one end of the signal line is connected for supplying the device current to each part of the device the device is connected to the secondary battery via a connector A backflow prevention element having a second terminal connected to the first node on the substrate; a constant current load circuit for generating a constant current I4 in addition to the device current I2 consumed by each part of the device; and the first node A second input terminal connected to the second node on the secondary battery side connected to the first node through the connector and the first input terminal connected ; The first contact when flowing The potential difference ΔV2 between the second contact and the potential difference ΔV24 between the first contact and the second contact when the device current I2 and the constant current I4 are supplied are detected, and the potential difference ΔV2 is detected. A loss detection circuit for detecting a loss between the first node and the second node as a charging current detection resistor based on the potential difference ΔV24 and the value of the constant current I4; and a first node connected to the first node. An input terminal; a second input terminal connected to the second node; and a third input terminal connected to the output terminal of the loss detection circuit; the first node detected by the loss detection circuit; A charging current detection circuit for detecting the charging current of the secondary battery flowing between the first node and the second node using the loss between the second nodes; a first connected to the first node; Input terminal, output terminal of the charging current detection circuit A second input terminal connected to a child and an output terminal connected to the control terminal of the charging switch, and after the loss detection between the first node and the second node by the loss detection circuit, The charging current of the secondary battery is caused to flow between the first node and the second node through the backflow prevention element by controlling the charging switch to an on state, and the charging detected by the charging current detection circuit Based on the current value, the charging switch is controlled to perform a constant current charging control, and it is determined whether the charging voltage at the first node is equal to or higher than a first specified value, and the charging voltage at the first node is determined. When the battery reaches the first specified value, the charging switch is controlled to perform constant voltage charging control, and the value of the charging current detected by the charging current detection circuit after the constant voltage charging control is less than or equal to the second specified value. When it becomes Characterized in that a constant-voltage constant-current control circuit for controlling turns off the electric switch.

以下、この発明の主題の様々な具体化を、添付図面を基に、その効果・利点と共に、詳述する。   Hereinafter, various embodiments of the subject of the present invention will be described in detail along with the effects and advantages thereof with reference to the accompanying drawings.

本発明の主題によれば、充電時には、二次電池へ流れる充電電流のみを検出することが出来るため、装置各部で消費される装置電流が如何なる場合であっても、充電を完了することが可能となる。しかも、非充電時には、二次電池から電圧ロス無く電力を装置各部へ供給することが出来る。   According to the subject of the present invention, only the charging current flowing to the secondary battery can be detected during charging, so that charging can be completed regardless of the device current consumed by each part of the device. It becomes. In addition, at the time of non-charging, power can be supplied from the secondary battery to each part of the device without voltage loss.

（実施の形態１）
図１は、本発明の実施の形態１に係る充電制御回路を備えた携帯電話の構成を示すブロック図である。 (Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a mobile phone including a charge control circuit according to Embodiment 1 of the present invention.

図１に示す通り、携帯電話は、主に各構成部の制御を行う制御部１３と、基地局との間で無線信号の通信を行う無線部１４と、変復調処理を行うベースバンド部１５と、音声信号のＡ／Ｄ変換又はＤ／Ａ変換を行う音声信号処理部１６と、アドレス帳やメロディなどの各種データを記憶する記憶部１７と、日時やユーザ操作情報等を表示する表示部１８と、ダイヤルなどのユーザ操作を入力する操作部１９と、各構成部に電力を供給する電源部２０と、リチウムイオン等から成る二次電池３と、二次電池３の充電制御を行う充電部（充電制御回路）２１と、二次電池３を充電するために電力を供給する外部電源２とで構成される。   As shown in FIG. 1, the mobile phone mainly includes a control unit 13 that controls each component, a radio unit 14 that performs radio signal communication with a base station, and a baseband unit 15 that performs modulation / demodulation processing. A voice signal processing unit 16 that performs A / D conversion or D / A conversion of a voice signal, a storage unit 17 that stores various data such as an address book and a melody, and a display unit 18 that displays date and time, user operation information, and the like. An operation unit 19 for inputting a user operation such as a dial, a power supply unit 20 for supplying power to each component, a secondary battery 3 made of lithium ions, and a charging unit for controlling charging of the secondary battery 3 (Charge control circuit) 21 and an external power source 2 that supplies electric power to charge the secondary battery 3.

次に、本実施の形態に係る充電制御回路の動作を、図２及び図３を参照しながら、説明する。   Next, the operation of the charge control circuit according to the present embodiment will be described with reference to FIGS.

図２は、充電制御回路１の概略構成を示すブロック図である。充電制御回路１は、二次電池３に充電電流Ｉ１を供給する回路である。同回路１は、外部電源２〜二次電池３間に挿入された充電スイッチ４と、充電電圧を検出して充電スイッチ４を制御する定電圧定電流制御回路５と、逆流防止素子６と、二次電池３へ流れる充電電流Ｉ１を検出する充電電流検出回路８と、その間に接続用コネクタ等を介した第１節点Ａ−第２節点Ｂ間のロスを検出するロス検出回路１１と、ロス検出のための定電流負荷回路１２とから構成されており、Ａ点と逆流防止素子６との間より取り出した電力を装置各部へ供給している。又、装置本体と二次電池３とは、コネクタを介して接続されている。   FIG. 2 is a block diagram illustrating a schematic configuration of the charge control circuit 1. The charging control circuit 1 is a circuit that supplies a charging current I1 to the secondary battery 3. The circuit 1 includes a charging switch 4 inserted between the external power source 2 and the secondary battery 3, a constant voltage constant current control circuit 5 that detects the charging voltage and controls the charging switch 4, a backflow prevention element 6, A charging current detection circuit 8 for detecting a charging current I1 flowing to the secondary battery 3; a loss detection circuit 11 for detecting a loss between the first node A and the second node B via a connection connector or the like; It comprises a constant current load circuit 12 for detection, and supplies power extracted from between the point A and the backflow prevention element 6 to each part of the apparatus. Further, the apparatus main body and the secondary battery 3 are connected via a connector.

図２の充電制御回路１では、既述の通り、図５の従来例回路とは違い、装置各部へ供給すべき電力をＡ点と逆流防止素子６との間より取り出しているため、二次電池３へ流れる充電電流Ｉ１を正確に検出することが可能となる。   In the charge control circuit 1 of FIG. 2, unlike the conventional circuit of FIG. 5, the power to be supplied to each part of the apparatus is taken out between the point A and the backflow prevention element 6 as described above. The charging current I1 flowing to the battery 3 can be accurately detected.

図３は、図２の充電制御回路１に於ける充電の制御を示すフローチャートである。   FIG. 3 is a flowchart showing charge control in the charge control circuit 1 of FIG.

先ず、充電制御回路１に外部電源２が接続される前、若しくは、外部電源２が接続された後に、装置本体〜二次電池３間（Ａ点〜Ｂ点間）のロス測定を行う（ステップＳ１）。ロス測定に関しては、装置各部で消費される装置電流Ｉ２のみで、装置本体〜二次電池３間（Ａ点〜Ｂ点間）の電位差ΔＶ２を、ロス検出回路１１で検出する（ステップＳ１１）。その後に、定電流負荷回路１２より定電流Ｉ４を発生させ、（装置電流Ｉ２＋定電流Ｉ４）での動作時の装置本体〜二次電池３間（Ａ点〜Ｂ点間）の電位差ΔＶ２４を、ロス検出回路１１で検出する（ステップＳ１２）。更に、ロス検出回路１１は、上記検出結果を基に、装置本体〜二次電池３間（Ａ点〜Ｂ点間）のロスを、（ΔＶ２４−ΔＶ２）÷Ｉ４の式より算出する（ステップＳ１３）。この算出されたロスを「充電電流検出用抵抗」として使用する。   First, before the external power supply 2 is connected to the charging control circuit 1 or after the external power supply 2 is connected, loss measurement between the apparatus main body and the secondary battery 3 (between points A and B) is performed (step). S1). Regarding the loss measurement, the loss detection circuit 11 detects the potential difference ΔV2 between the device main body and the secondary battery 3 (between points A and B) only by the device current I2 consumed by each part of the device (step S11). After that, a constant current I4 is generated from the constant current load circuit 12, and a potential difference ΔV24 between the device main body and the secondary battery 3 (between points A and B) during operation in (device current I2 + constant current I4) is Detection is performed by the loss detection circuit 11 (step S12). Further, the loss detection circuit 11 calculates the loss between the device main body and the secondary battery 3 (between points A and B) based on the above detection result by the equation (ΔV24−ΔV2) ÷ I4 (step S13). ). This calculated loss is used as a “charging current detection resistor”.

次に、定電圧定電流制御回路５により充電スイッチ４がオンされ、二次電池３へ流れる充電電流Ｉ１が流れる。そして、上記ロスを使用して、二次電池３へ流れる充電電流Ｉ１を充電電流検出回路８で検出し、その検出結果に基づき定電圧定電流制御回路５は充電スイッチ４を制御して定電流充電制御を行う（ステップＳ２）。   Next, the charging switch 4 is turned on by the constant voltage / constant current control circuit 5, and the charging current I <b> 1 flowing to the secondary battery 3 flows. Then, using the loss, the charging current I1 flowing to the secondary battery 3 is detected by the charging current detection circuit 8, and the constant voltage constant current control circuit 5 controls the charging switch 4 based on the detection result to control the constant current. Charge control is performed (step S2).

次に、Ａ点に接続されている定電圧定電流制御回路５は二次電池３の充電電圧の判定を行い、電池電圧が規定値（第１規定値）に達すると（ステップＳ３）、定電圧定電流制御回路５は充電スイッチ４を制御して、定電流充電制御から定電圧充電制御に切換る（ステップＳ４）。   Next, the constant voltage constant current control circuit 5 connected to the point A determines the charging voltage of the secondary battery 3, and when the battery voltage reaches a specified value (first specified value) (step S3), The voltage constant current control circuit 5 controls the charge switch 4 to switch from constant current charge control to constant voltage charge control (step S4).

その後、徐々に充電電流Ｉ１が減少し、充電電流Ｉ１が規定値（第２規定値）以下になるのを充電電流検出回路８が検出すると（ステップＳ５）、充電電流検出回路８はその判定結果を定電圧定電流制御回路５に送信し、当該判定結果を受信した定電圧定電流制御回路５は充電スイッチ４をオフに制御し、充電が完了する（ステップＳ６）。   Thereafter, when the charging current detection circuit 8 detects that the charging current I1 gradually decreases and the charging current I1 becomes equal to or less than the specified value (second specified value) (step S5), the charging current detection circuit 8 determines the result of the determination. Is transmitted to the constant voltage / constant current control circuit 5, and the constant voltage / constant current control circuit 5 having received the determination result controls the charging switch 4 to be turned off, and the charging is completed (step S6).

以上の様に、図５の回路とは異なり、逆流防止素子６に一端が接続された充電電流検出用抵抗７を用いておらず、その代わりに必ず発生する装置本体〜二次電池３間（Ａ点〜Ｂ点間）の基板パターン及びコネクタ接触の抵抗を充電電流検出用抵抗として使用するため、充電時に於いては、二次電池３へ流れる充電電流Ｉ１を正確に検出することが可能となり、装置各部に流れる装置電流Ｉ２の如何に拘らず、確実に二次電池３の充電動作を完了させることが出来る。しかも、図２の充電制御回路は、図６の回路とは異なり、装置電流検出用抵抗９を用いることなく、単にＡ点と逆流防止素子６の一端との間から信号線によって装置各部へ供給すべき電力を取り出しているため、非充電時に於いては、二次電池３から電圧ロス無く電力を装置各部へ供給することが出来る。   As described above, unlike the circuit of FIG. 5, the charging current detection resistor 7 having one end connected to the backflow prevention element 6 is not used, but instead it is always generated between the device main body and the secondary battery 3 ( Since the resistance of the board pattern and connector contact (between points A and B) is used as the resistance for detecting the charging current, the charging current I1 flowing to the secondary battery 3 can be accurately detected during charging. Regardless of the device current I2 flowing through each part of the device, the charging operation of the secondary battery 3 can be completed reliably. In addition, unlike the circuit of FIG. 6, the charge control circuit of FIG. 2 is simply supplied to each part of the device by a signal line from between the point A and one end of the backflow prevention element 6 without using the device current detection resistor 9. Since the power to be taken out is taken out, power can be supplied from the secondary battery 3 to each part of the apparatus without voltage loss during non-charging.

（実施の形態２）
実施の形態１では、充電時には、装置各部で消費される装置電流Ｉ２に影響を受けることなく、二次電池３へ流れる充電電流Ｉ１を正確に検出し、且つ、非充電時には、二次電池３から電圧ロスなく電力を装置各部へ供給出来る充電制御回路について説明した。 (Embodiment 2)
In Embodiment 1, the charging current I1 flowing to the secondary battery 3 is accurately detected without being affected by the device current I2 consumed by each part of the device during charging, and the secondary battery 3 is not charged during charging. A charge control circuit that can supply power to each part of the apparatus without voltage loss has been described.

更に、本実施の形態では、図２の回路を援用した上で（但し、ロス検出回路１１の他の出力端は、定電圧定電流制御回路５に接続される。）、図４の充電の制御を示すフローチャートに示す様に、Ａ点〜Ｂ点間のロスの測定（ステップＳ１）と定電流充電（ステップＳ３）との間に、（１）ロス検出回路１１がＡ点〜Ｂ点間のロスが規定値（第３規定値）を越えているか否かを判定するロス判定（ステップＳ７）と、（２）Ａ点〜Ｂ点間のロスが上記規定値を越えているときには、ロス検出回路１１の判定結果を受けて定電圧定電流制御回路５が充電スイッチ４をオフに制御して充電を停止してしまい、その充電停止を受けて携帯電話の表示部１８に充電停止の警告を表示する「充電停止及び警告」（ステップＳ８）とを追加する。   Further, in the present embodiment, the circuit of FIG. 2 is used (however, the other output terminal of the loss detection circuit 11 is connected to the constant voltage / constant current control circuit 5), and the charging of FIG. As shown in the flowchart showing the control, between the measurement of the loss between the points A and B (step S1) and the constant current charging (step S3), (1) the loss detection circuit 11 is between the points A and B. Loss determination (step S7) for determining whether or not the loss of the current exceeds the specified value (third specified value), and (2) If the loss between points A and B exceeds the specified value, the loss In response to the determination result of the detection circuit 11, the constant voltage / constant current control circuit 5 controls the charging switch 4 to be turned off to stop charging. Upon receiving the charging stop, the display unit 18 of the mobile phone is informed of the charging stop. "Charge stop and warning" (step S8) is added.

この場合には、ロス検出回路１１が予め設定しておいたロス値と比較することで、装置本体〜二次電池３間（Ａ点〜Ｂ点間）に異物やコネクタの腐食などで生じるロスを検出することが出来る。この接続チェック機能を有することで、ロス増大による二次電池３の不要な消耗を防ぐことが可能となる。   In this case, the loss detection circuit 11 compares the loss value set in advance with a loss caused by foreign matter or corrosion of the connector between the device body and the secondary battery 3 (between points A and B). Can be detected. By having this connection check function, it is possible to prevent unnecessary consumption of the secondary battery 3 due to increased loss.

（付記）
以上、本発明の実施の形態を詳細に開示し記述したが、以上の記述は本発明の適用可能な局面を例示したものであって、本発明はこれに限定されるものではない。即ち、記述した局面に対する様々な修正や変形例を、この発明の範囲から逸脱することの無い範囲内で考えることが可能である。 (Appendix)
While the embodiments of the present invention have been disclosed and described in detail above, the above description exemplifies aspects to which the present invention can be applied, and the present invention is not limited thereto. In other words, various modifications and variations to the described aspects can be considered without departing from the scope of the present invention.

本発明に係る充電制御回路は、携帯電話等の携帯機器に内蔵された二次電池の充電制御に適用して好適である。   The charge control circuit according to the present invention is suitable for application to charge control of a secondary battery built in a portable device such as a mobile phone.

本発明の実施の形態１に係る充電制御回路を備えた携帯電話の構成を示すブロック図である。It is a block diagram which shows the structure of the mobile telephone provided with the charge control circuit which concerns on Embodiment 1 of this invention. 実施の形態１及び２に於ける充電制御回路の構成を示す図である。FIG. 3 is a diagram showing a configuration of a charge control circuit in the first and second embodiments. 実施の形態１に於ける充電制御動作を示すフローチャートである。3 is a flowchart showing a charge control operation in the first embodiment. 実施の形態２に於ける充電制御動作を示すフローチャートである。6 is a flowchart showing a charge control operation in the second embodiment. 従来の充電制御回路の構成を示すブロック図である。It is a block diagram which shows the structure of the conventional charge control circuit. 他の従来の充電制御回路の構成を示すブロック図である。It is a block diagram which shows the structure of the other conventional charge control circuit.

符号の説明Explanation of symbols

１ 充電制御回路、２ 外部電源、３ 二次電池、４ 充電スイッチ、５ 定電圧定電流制御回路、６ 逆流防止素子、７ 充電電流検出用抵抗、８ 充電電流検出回路、９ 装置電流検出用抵抗、１０ 装置電流検出回路、１１ ロス検出回路、１２ 定電流負荷回路、１３ 制御部、１４ 無線部、１５ ベースバンド部、１６ 音声信号処理部、１７ 記憶部、１８ 表示部、１９ 操作部、２０ 電源部、２１ 充電部（充電制御回路）。   DESCRIPTION OF SYMBOLS 1 Charge control circuit, 2 External power supply, 3 Secondary battery, 4 Charge switch, 5 Constant voltage constant current control circuit, 6 Backflow prevention element, 7 Charge current detection resistor, 8 Charge current detection circuit, 9 Device current detection resistor DESCRIPTION OF SYMBOLS 10 Device current detection circuit, 11 Loss detection circuit, 12 Constant current load circuit, 13 Control part, 14 Radio | wireless part, 15 Baseband part, 16 Audio | voice signal processing part, 17 Memory | storage part, 18 Display part, 19 Operation part, 20 Power supply part, 21 Charging part (charge control circuit).

Claims (3)

機器に内蔵された二次電池に充電電流を供給するための充電制御回路であって、
前記機器の外部電源にその一端が接続された充電スイッチと、
前記充電スイッチの他端に接続された第１端子、及び、コネクタを介して前記二次電池に接続されると共に前記機器の装置各部に装置電流を供給するための信号線の一端が接続された前記充電制御回路用基板上の第１節点に接続された第２端子を有する逆流防止素子と、
前記装置各部で消費される装置電流Ｉ２に加えて定電流Ｉ４を発生させる定電流負荷回路と、
前記第１節点に接続された第１入力端子及び前記コネクタを介して前記第１節点に接続される前記二次電池側の第２節点に接続される第２入力端子を有しており、前記装置電流Ｉ２のみを流したときの前記第１接点と前記第２接点との間の電位差ΔＶ２と、前記装置電流Ｉ２と前記定電流Ｉ４とを流したときの前記第１接点と前記第２接点との間の電位差ΔＶ２４とを検出し、前記電位差ΔＶ２、前記電位差ΔＶ２４及び前記定電流Ｉ４の値に基づいて前記第１節点と前記第２節点間のロスを充電電流検出用抵抗として検出するロス検出回路と、
前記第１節点に接続された第１入力端子、前記第２節点に接続される第２入力端子及び前記ロス検出回路の出力端子に接続された第３入力端子を有しており、前記ロス検出回路が検出した前記第１節点と前記第２節点間の前記ロスを使用して前記第１節点と前記第２節点間に流れる前記二次電池の前記充電電流を検出する充電電流検出回路と、
前記第１節点に接続された第１入力端子、前記充電電流検出回路の出力端子に接続された第２入力端子及び前記充電スイッチの制御端子に接続された出力端子を有しており、前記ロス検出回路による前記第１節点と前記第２節点間の前記ロスの検出後に、前記充電スイッチをオン状態に制御して前記逆流防止素子を介して前記第１節点と前記第２節点間に前記二次電池の前記充電電流を流し、前記充電電流検出回路で検出された前記充電電流の値に基づき前記充電スイッチを制御して定電流充電制御を行うと共に、前記第１節点の充電電圧が第１規定値以上となったか否かを判定して前記第１節点の前記充電電圧が前記第１規定値に達したときには前記充電スイッチを制御して定電圧充電制御を行い、定電圧充電制御後に前記充電電流検出回路で検出された前記充電電流の値が第２規定値以下になったときには前記充電スイッチをオフ状態に制御する定電圧定電流制御回路とを備えたことを特徴とする、
充電制御回路。 A charge control circuit for supplying a charging current to a secondary battery built in the device ,
A charging switch having one end connected to an external power source of the apparatus,
The first terminal connected to the other end of the charging switch, and one end of the signal line for supplying the device current to each part of the device the device is connected to the secondary battery through the connector is connected A backflow prevention element having a second terminal connected to a first node on the charge control circuit board;
A constant current load circuit for generating a constant current I4 in addition to a device current I2 consumed in each part of the device;
A first input terminal connected to the first node and a second input terminal connected to the second node on the secondary battery side connected to the first node via the connector ; A potential difference ΔV2 between the first contact and the second contact when only the device current I2 flows, and the first contact and the second contact when the device current I2 and the constant current I4 flow. A potential difference ΔV24 between the first node and the second node is detected as a charging current detection resistor based on the potential difference ΔV2, the potential difference ΔV24, and the constant current I4. A detection circuit;
A first input terminal connected to the first node; a second input terminal connected to the second node; and a third input terminal connected to an output terminal of the loss detection circuit; A charging current detection circuit for detecting the charging current of the secondary battery flowing between the first node and the second node using the loss between the first node and the second node detected by a circuit;
A first input terminal connected to the first node; a second input terminal connected to the output terminal of the charging current detection circuit; and an output terminal connected to a control terminal of the charge switch; After detecting the loss between the first node and the second node by a detection circuit, the charging switch is controlled to be in an on state, and the second node is connected between the first node and the second node via the backflow prevention element. The charging current of the secondary battery is allowed to flow, the charging switch is controlled based on the value of the charging current detected by the charging current detection circuit to perform constant current charging control, and the charging voltage at the first node is first. When the charging voltage at the first node reaches the first specified value by determining whether or not it is equal to or higher than a specified value, the charging switch is controlled to perform constant voltage charging control, and after the constant voltage charging control, Charge current detection times Characterized in that a constant-voltage constant-current control circuit for controlling the charging switch in an OFF state when the value of the charging current in detected is equal to or less than a second predetermined value,
Charge control circuit. 請求項１記載の充電制御回路であって、
前記ロス検出回路は、前記第１節点と前記第２節点間の前記ロスが第３規定値以上であるか否かを判定し、前記ロスが前記第３規定値以上であるときには、前記定電圧定電流制御回路に対して充電停止を指示することを特徴とする、
充電制御回路。 The charge control circuit according to claim 1,
The loss detection circuit determines whether or not the loss between the first node and the second node is equal to or greater than a third specified value, and when the loss is equal to or greater than the third specified value, the constant voltage Instructing the constant current control circuit to stop charging,
Charge control circuit. 二次電池と、
前記二次電池に充電電流を供給するための請求項１又は２に記載の前記充電制御回路とを具備することを特徴とする、
機器。 A secondary battery,
The charging control circuit according to claim 1 or 2 for supplying a charging current to the secondary battery.
Equipment .
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61213780A (en) * 1985-03-20 1986-09-22 Automob Antipollut & Saf Res Center Apparatus for diagnosis of battery
JPH06339220A (en) * 1993-05-26 1994-12-06 Sony Tektronix Corp Overcurrent cut-off device
JPH0811634A (en) * 1994-06-28 1996-01-16 Showa Alum Corp Opening/closing structure of lid at casing
JPH08114634A (en) * 1994-10-18 1996-05-07 Nissin Electric Co Ltd Contact resistance measuring device
JP2005168102A (en) * 2003-11-28 2005-06-23 Rohm Co Ltd Charger and portable electronic device equipped therewith

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61213780A (en) * 1985-03-20 1986-09-22 Automob Antipollut & Saf Res Center Apparatus for diagnosis of battery
JPH06339220A (en) * 1993-05-26 1994-12-06 Sony Tektronix Corp Overcurrent cut-off device
JPH0811634A (en) * 1994-06-28 1996-01-16 Showa Alum Corp Opening/closing structure of lid at casing
JPH08114634A (en) * 1994-10-18 1996-05-07 Nissin Electric Co Ltd Contact resistance measuring device
JP2005168102A (en) * 2003-11-28 2005-06-23 Rohm Co Ltd Charger and portable electronic device equipped therewith

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