JP5407234B2 - Charge control device - Google Patents

Charge control device Download PDF

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JP5407234B2
JP5407234B2 JP2008230775A JP2008230775A JP5407234B2 JP 5407234 B2 JP5407234 B2 JP 5407234B2 JP 2008230775 A JP2008230775 A JP 2008230775A JP 2008230775 A JP2008230775 A JP 2008230775A JP 5407234 B2 JP5407234 B2 JP 5407234B2
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charging
charge
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control
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JP2010068579A (en
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良和 板倉
義行 中玉利
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Panasonic Corp
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Description

本発明は充電制御装置に関し、定電流制御及び定電圧制御機能を備えて、リチウムイオン電池等の二次電池を充電するための充電制御装置に関する。   The present invention relates to a charge control device, and more particularly, to a charge control device for charging a secondary battery such as a lithium ion battery having constant current control and constant voltage control functions.

従来の二次電池の充電方法を特開平０９−１４７９２１号から引用した図５に示す。図５において、ＤＣ／ＤＣコンバータ機構の主回路１と、電池３が組み合わさり、２つの誤差増幅器６と誤差増幅器１２があり、出力電圧設定９、サーミスタ１９とマイクロプロセッサー２２で構成され、これらを主要回路とし充電制御装置を構成している。従来の技術は、二次電池に定電流で充電し、その充電進行に伴う充電電圧値がある設定電圧値に達した時点で、定電圧で充電する二次電池の充電制御方法であって充電開始時の電池温度に応じて、前記定電圧で充電する電圧値を選択設定するものである。   A conventional method for charging a secondary battery is shown in FIG. In FIG. 5, the main circuit 1 of the DC / DC converter mechanism and the battery 3 are combined, and there are two error amplifiers 6 and an error amplifier 12, which are composed of an output voltage setting 9, a thermistor 19 and a microprocessor 22. A charge control device is configured as a main circuit. The conventional technology is a charge control method for a secondary battery in which a secondary battery is charged with a constant current and charged with a constant voltage when the charge voltage value associated with the progress of the charge reaches a set voltage value. The voltage value to be charged with the constant voltage is selectively set according to the battery temperature at the start.

また、図４は二次電池に対し定電流制御及び定電圧制御を行う充電制御装置において、充電中に電池温度に応じて充電制御電圧を切り替る機能を有し、かつ充電電流が終了電流に達した場合は、実用充電完了判定を行い、補充電としてさらにフロート充電を継続する一般的な充電制御装置の電気回路ブロック図である。   FIG. 4 is a charge control device that performs constant current control and constant voltage control on the secondary battery, and has a function of switching the charge control voltage according to the battery temperature during charging, and the charge current is changed to the end current. When it has reached, it is an electric circuit block diagram of a general charge control device that performs practical charge completion determination and continues float charge as auxiliary charge.

また、図８は前記図４で示した一般的な充電制御装置における充電フロー図であり、急速充電中は温度によって充電制御電圧を切り替え、充電電流が充電終了電流設定値に達すると実用充電完了判定を行い、フロート充電に移行し、その後充電完了となる。
特開平９−１４７９２１号公報 FIG. 8 is a charge flow chart in the general charge control device shown in FIG. 4. During the quick charge, the charge control voltage is switched depending on the temperature, and when the charge current reaches the charge end current set value, the practical charge is completed. A determination is made, the process proceeds to float charging, and then charging is completed.
JP-A-9-147721

しかしながら、従来の充電制御方法で、かつ充電中に電池温度を検出し、その温度に応じて充電制御電圧を切り替る充電制御装置においては、電池を充電中、満充電状態近くまで充電され、かつ電池温度が変化し充電制御電圧が切り替り、電池電圧が充電制御電圧を超える条件下になった場合は、電流は瞬時に低下し終了電流に到達するため、充電は一旦休止し実用充電完了判定を行う。   However, in the charge control device that detects the battery temperature during charging and switches the charging control voltage according to the temperature in the conventional charge control method, the battery is charged to near full charge while charging the battery, and When the battery temperature changes, the charge control voltage switches, and the battery voltage exceeds the charge control voltage, the current decreases instantaneously and reaches the end current. I do.

実用充電完了判定の後にフロート充電を継続する機能を有する充電制御装置においては、前記フロート充電中のときは充電制御装置に内接された充電用スイッチがＯＮになっているため電池電圧が充電制御電圧を超える条件下では電池から充電制御回路へ電流が流れ込み逆流現象が発生し、充電制御装置の劣化や破壊または電池の容量抜けが起こる可能性があるという課題を有していた。   In the charge control device having the function of continuing the float charge after the completion of the practical charge determination, the battery voltage is charge controlled because the charging switch inscribed in the charge control device is ON during the float charge. Under conditions where the voltage exceeds the voltage, a current flows from the battery to the charge control circuit and a reverse flow phenomenon occurs, which may cause deterioration or destruction of the charge control device or battery capacity loss.

前記従来の課題を解決するために本発明は、電池パックの温度状態により充電電圧の設定値を切り替る充充電制御装置において、充電電流を一定に制御するための定電流制御用コンパレータ（ＣＣ）と、充電電圧を一定に制御するための定電圧制御用コンパレータ（ＣＶ）と、前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力するＯＲ回路と、前記ＯＲ回路からの信号を受け動作する帰還回路と、前記電池パックから充電回路への逆流を検出する電池逆流検出回路と、前記電池に内設されたサーミスタ抵抗により温度を検出する電池温度検出回路と、前記電池逆流検出回路および前記電池温度検出回路からの信号を受け充電制御を行う制御ロジックと、前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り換る充電スイチとからなり、当該充電制御装置により前記電池パックを充電中、前記電池パックの温度の変化によって充電電圧値が切り換り充電電流が充電終了電流まで低下したとき、前記制御ロジックは一旦充電を休止して実用充電完了判定を行った後、前記電池逆流検出回路で検出した逆流がない場合は前記充電スイッチをＯＮにしてフロート充電を行い、前記電池逆流検出回路で検出した逆流がある場合は前記充電スイッチをＯＦＦにするものである。
The present invention to solve the conventional problems is the charge charge control device that switches the set value of the charge current pressure by the temperature state of the battery pack, the constant current control comparator for controlling the charging current constant (CC ) and a constant voltage control comparator for controlling the charging voltage constant (CV), oR for outputting a signal by the operation of the constant current control comparator (CC) and the constant voltage control comparator (CV) circuit and a feedback circuit which operates receiving a signal from the OR circuit, wherein the battery reverse current detector circuit for detecting a backflow into the charging circuit from the battery pack, a battery for detecting the temperature by the thermistor resistor is provided inside the battery A temperature detection circuit, a control logic for performing charge control in response to a signal from the battery backflow detection circuit and the battery temperature detection circuit, and from the control logic Receiving consists of a換Ru charging Suichi Turn ON-OFF of charging items, charging the battery pack by the charging control device, wherein the temperature change of the battery pack off the charge current pressure value換Ri charging current when dropped to the end of charging current, the control logic after Tsu row practical charging completion determination paused charging once float charge when there is no back flow detected by the battery reverse current detector circuit in the oN the charging switch When there is a backflow detected by the battery backflow detection circuit, the charging switch is turned off .

また、電池パックの温度状態により充電電圧の設定値を切り替る充電制御装置において、充電電流を一定に制御するための定電流制御用コンパレータ（ＣＣ）と、充電電圧を一定に制御するための定電圧制御用コンパレータ（ＣＶ）と、前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力するＯＲ回路と、前記ＯＲ回路からの信号を受け動作する帰還回路と、前記電池パックに内設されたサーミスタ抵抗により温度を検出する電池温度検出回路と、前記温度により充電電圧を切り換える充電電圧設定部と、前記充電電圧設定部および前記電池温度検出回路からの信号を受け充電制御を行う制御ロジックと、前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り替る充電スイッチとからなり、当該充電制御装置により前記電池パックを充電中、前記電池パックの温度変化によって前記充電電圧設定部が充電電圧値を切り換え、充電電流が充電終了電流まで低下したとき、前記制御ロジックは一旦充電を休止して実用充電完了判定を行った後、前記電池パックの電圧値が温度変化によって切り換った充電電圧値を超えない場合は前記充電スイッチをＯＮにしてフロート充電を行い、前記電池パックの電圧値が温度変化によって切り換った充電電圧値を超える場合は前記充電スイッチをＯＦＦにするものである。
Further, in the charge control device that switches the set value of the charge voltage depending on the temperature state of the battery pack, a constant current control comparator (CC) for controlling the charge current to be constant and a constant for controlling the charge voltage to be constant. A voltage control comparator (CV), an OR circuit that outputs a signal by the operations of the constant current control comparator (CC) and the constant voltage control comparator (CV), and a feedback that receives a signal from the OR circuit and operates. A circuit, a battery temperature detection circuit for detecting a temperature by a thermistor resistance provided in the battery pack, a charging voltage setting unit for switching a charging voltage according to the temperature, the charging voltage setting unit, and the battery temperature detection circuit A control logic that controls charging by receiving a signal, and a charging logic that switches ON / OFF charging by receiving a signal from the control logic. Consists of a pitch, during charging the battery pack by the charging control device, wherein the charging voltage setting unit For switching charge current pressure value with temperature change of the battery pack, lowering the charging current until the charging termination current when, after the control logic has Tsu row practical charging completion determination paused charging once, when the voltage value of the battery pack does not exceed the charging voltage value Tsu conversion cut by temperature changes ON the charging switch Float charging is performed, and when the voltage value of the battery pack exceeds the charging voltage value switched by temperature change, the charging switch is turned off .

また、電池パックの温度状態により充電電圧の設定値を切り替る充電制御装置において、充電電流を一定に制御するための定電流制御用コンパレータ（ＣＣ）と、充電電圧を一定に制御するための定電圧制御用コンパレータ（ＣＶ）と、前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力するＯＲ回路と、前記ＯＲ回路からの信号を受け動作する帰還回路と、前記電池パックに内設されたサーミスタ抵抗により温度を検出する電池温度検出回路と、前記定電圧制御用コンパレータ（ＣＶ）から前記電池パックの電圧値が前記充電電圧を超えた反転動作であるか検出する反転出力検出回路と、前記充電電圧設定部および前記電池温度検出回路からの信号を受け充電制御を行う制御ロジックと、前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り替る充電スイッチとからなり、
当該充電制御装置により前記電池パックを充電中、前記電池パックの温度変化によって充電電圧値が切り換り充電電流が充電終了電流まで低下したとき、前記制御ロジックは一旦充電を休止して実用充電完了判定を行った後、前記反転出力検出回路の出力が反転動作でない場合は前記充電スイッチをＯＮにしてフロート充電を行い、前記反転出力検出回路の出力が反転動作である場合は前記充電スイッチをＯＦＦにするものである。 In addition, in the charge control device that switches the set value of the charge voltage depending on the temperature state of the battery pack, a constant current control comparator (CC) for controlling the charge current constant, and a constant for controlling the charge voltage constant. A voltage control comparator (CV), an OR circuit that outputs a signal by the operations of the constant current control comparator (CC) and the constant voltage control comparator (CV), and a feedback that receives a signal from the OR circuit and operates. A reversal operation in which the voltage value of the battery pack exceeds the charging voltage from the circuit, a battery temperature detection circuit for detecting the temperature by a thermistor resistance provided in the battery pack, and the constant voltage control comparator (CV) An inverted output detection circuit for detecting whether there is a signal, and a control signal for performing charge control upon receiving signals from the charge voltage setting unit and the battery temperature detection circuit. And click, composed of a charging switch for switching the ON-OFF of the charge receiving a signal from said control logic,
While charging the battery pack by the charge control device, when the charge voltage value is switched due to the temperature change of the battery pack and the charge current is reduced to the charge end current, the control logic pauses the charge and completes the practical charge. After performing the determination, if the output of the inverting output detection circuit is not inverting, the charging switch is turned on to perform float charging. If the output of the inverting output detecting circuit is inverting, the charging switch is turned off. It is to make.

本発明によると充電制御装置は、定電流制御用コンパレータ（ＣＣ）及び定電圧制御用コンパレータ（ＣＶ）によって電池を充電制御する際に、充電制御電圧に達した場合は一旦充電を休止し、その後、フロート充電を行うような一般的な充電制御機能を有し、かつ電池温度の状態によって充電制御電圧値を切り換える機能を有する充電制御装置である。電池を充電中、電池温度の変化によって充電制御電圧値が切り換り、電池電圧が充電制御電圧を超える条件下では充電電流は瞬時に低下し、充電は一旦休止し、実用充電完了判定を行うが、フロート充電へ移行した際には電池から充電制御回路へ電流が逆流することを防止している。   According to the present invention, when the battery is controlled to be charged by the constant current control comparator (CC) and the constant voltage control comparator (CV), if the charge control voltage is reached, the charge control device temporarily stops charging, and then The charge control device has a general charge control function for performing float charge and a function of switching a charge control voltage value according to the state of the battery temperature. While the battery is being charged, the charge control voltage value changes due to changes in the battery temperature, and under conditions where the battery voltage exceeds the charge control voltage, the charging current instantaneously drops, charging is paused, and a practical charge completion determination is made. However, the current is prevented from flowing backward from the battery to the charge control circuit when the float charging is performed.

実用充電完了判定時に電池電圧が充電制御電圧を超える条件下では、電池電圧の値および充電制御電圧設定の値を比較し、ロジック回路へ信号を送ることで、充電用スイッチのＯＮ−ＯＦＦを制御しフロート充電を終了させることで、電池から充電制御回路へ電流が逆流することを防止している。   Under the condition that the battery voltage exceeds the charge control voltage when determining the completion of practical charge, the battery voltage value and the charge control voltage setting value are compared, and a signal is sent to the logic circuit to control ON / OFF of the charging switch. By terminating the float charging, the current is prevented from flowing backward from the battery to the charge control circuit.

また、定電圧制御用コンパレータ（ＣＶ）は充電制御電圧設定の機能を兼ね備えた構成とし、実用充電完了判定時に定電圧制御用コンパレータ（ＣＶ）の出力が反転していることを検知できるように構成した場合は、高精度に電池電圧と充電制御電圧の比較を行うことが可能となる。電池から充電制御回路へ電流が逆流することは、充電制御回路の劣化や故障、または充電中にもかかわらず電池の容量が低下するといった現象を招く可能性があり、本発明はそれらを防ぐことに対し有効である。   The constant voltage control comparator (CV) also has a function of setting the charge control voltage, and is configured to detect that the output of the constant voltage control comparator (CV) is inverted when determining the completion of the practical charge. In this case, the battery voltage and the charge control voltage can be compared with high accuracy. The reverse flow of current from the battery to the charge control circuit may cause a phenomenon such as deterioration or failure of the charge control circuit, or a decrease in battery capacity despite being charged, and the present invention prevents them. It is effective against.

以下本発明を実施するための最良の形態について、図面を参照しながら説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

（実施の形態１）
図１は本発明の実施の形態１である充電制御装置の電気回路ブロック図を示している。図１に示すように、定電流制御用コンパレータ（ＣＣ）１０１は充電電流を一定に制御するための回路であり、定電圧制御用コンパレータ（ＣＶ）１０２は電池の充電電圧を一定に制御するための回路であり、ＯＲ回路１０３は前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力する回路であり、帰還回路１０４は前記ＯＲ回路からの信号を受け動作する回路であり、電池逆流検出回路１０５は電池から充電回路への逆流を検出する回路であり、電池温度検出回路１０６は電池パックに内設されたサーミスタ抵抗により温度を検出する回路であり、制御ロジック１０７は前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）および前記電池逆流防止判定回路および前記温度検出回路からの信号を受け充電制御を行う回路であり、充電スイッチ１０８は前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り換るスイッチであり、リチウムイオン電池等を定電流制御及び定電圧制御により充電を行い、かつ電池を充電中に、電池温度によって充電制御電圧が選択設定される充電制御装置である。 (Embodiment 1)
FIG. 1 shows an electric circuit block diagram of a charging control apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the constant current control comparator (CC) 101 is a circuit for controlling the charging current to be constant, and the constant voltage control comparator (CV) 102 is for controlling the charging voltage of the battery to be constant. The OR circuit 103 is a circuit that outputs a signal by the operation of the constant current control comparator (CC) and the constant voltage control comparator (CV), and the feedback circuit 104 receives the signal from the OR circuit. The battery backflow detection circuit 105 is a circuit that detects the backflow from the battery to the charging circuit, and the battery temperature detection circuit 106 is a circuit that detects the temperature using a thermistor resistance provided in the battery pack. The control logic 107 includes the constant current control comparator (CC), the constant voltage control comparator (CV), and the battery backflow prevention. A circuit that performs charge control by receiving signals from the determination circuit and the temperature detection circuit, and a charge switch 108 is a switch that switches on and off of charge in response to a signal from the control logic, such as a lithium ion battery. This is a charge control device in which charging is performed by constant current control and constant voltage control, and the charging control voltage is selectively set according to the battery temperature during charging of the battery.

充電中の電池が設定された充電制御電圧に達し、定電圧制御用コンパレータ（ＣＶ）１０２によって定電圧制御されている状態で、電池温度の変化により充電制御電圧が下がった場合には充電電流は設定されている終了電流まで低下するため、一旦充電を休止し実用充電完了判定を行う。   When the battery being charged reaches the set charge control voltage and is under constant voltage control by the constant voltage control comparator (CV) 102, if the charge control voltage decreases due to a change in battery temperature, the charge current is In order to decrease to the set end current, charging is temporarily stopped and a practical charging completion determination is performed.

実用充電完了判定において、電池電圧条件を満たしフロート充電に移行した場合、充電スイッチ１０８は再びＯＮ状態になり電池電圧が充電制御電圧を超える条件下においては、電池から充電制御回路へ電流が逆流する。この逆流する電流を電池逆流検出回路１０５により検出し、制御ロジック１０７を介し、充電スイッチ１０８をＯＦＦに切り替えることでフロート充電を終了させている。   When the battery voltage condition is satisfied and the shift to the float charge is made in the determination of the completion of the practical charge, the charge switch 108 is turned on again, and the current flows backward from the battery to the charge control circuit under the condition that the battery voltage exceeds the charge control voltage. . The battery backflow detection circuit 105 detects this backflowing current, and the charge switch 108 is turned off via the control logic 107 to end the float charging.

図６は実施の形態１で示した充電制御装置における充電フロー図であり、急速充電中は温度によって充電制御電圧を切り替え、充電電流が充電終了電流設定値に達すると実用充電完了判定を行い、電池から充電装置への逆流の発生有無を判定し、フロート充電に移行またはフロート充電を飛ばすように構成し、その後充電完了となる。   FIG. 6 is a charge flow diagram in the charge control device shown in the first embodiment. During the quick charge, the charge control voltage is switched depending on the temperature, and when the charge current reaches the charge end current set value, the practical charge completion determination is performed. It is determined whether or not the backflow from the battery to the charging device has occurred, and is configured to shift to the float charge or skip the float charge, and then the charge is completed.

また、図２は本発明の実施の形態２である充電制御装置の電気回路ブロック図を示している。図２に示すように、コンパレータ（ＶＣ）２０５はバッファ回路を介した電池電圧値と電池温度によって選択設定された充電制御電圧値を比較し制御ロジック２０７に信号を送るものである。前記実施の形態１で示した動作と同様に充電中の電池が設定された充電制御電圧に達し、定電圧制御用コンパレータ（ＣＶ）２０２によって定電圧制御されている状態で、電池温度の変化により充電制御電圧が下がった場合には充電電流は設定されている終了電流まで低下するため、一旦充電を休止し実用充電完了判定を行う。   FIG. 2 shows an electric circuit block diagram of the charging control apparatus according to the second embodiment of the present invention. As shown in FIG. 2, the comparator (VC) 205 compares the battery voltage value via the buffer circuit with the charge control voltage value selected and set according to the battery temperature, and sends a signal to the control logic 207. Similar to the operation described in the first embodiment, the battery being charged reaches the set charge control voltage and is controlled by the constant voltage control comparator (CV) 202. When the charging control voltage is lowered, the charging current is reduced to the set end current. Therefore, the charging is temporarily stopped and the practical charging completion determination is performed.

実用充電完了判定において、電池電圧条件を満たしフロート充電に移行した場合、充電スイッチ２０８は再びＯＮ状態になり電池電圧が充電制御電圧を超える条件下においては、前記コンパレータ（ＶＣ）２０５により制御ロジックへ信号を送り充電スイッチ２０８をＯＦＦに切り替えることでフロート充電を終了させている。   In the determination of the completion of practical charging, when the battery voltage condition is satisfied and the flow shifts to the float charging, the charging switch 208 is turned on again, and under the condition that the battery voltage exceeds the charging control voltage, the comparator (VC) 205 returns to the control logic. The float charging is terminated by sending a signal and switching the charging switch 208 to OFF.

また、図３は本発明の実施の形態３である充電制御装置の電気回路ブロック図を示している。図３に示すように、定電圧制御回路／充電制御電圧設定回路３０２は、充電制御電圧設定を行っており、反転出力検出回路３０５は前記の定電圧制御回路／充電制御電圧設定回路３０２の出力の反転した動作を検出するものである。   FIG. 3 shows an electric circuit block diagram of the charging control apparatus according to the third embodiment of the present invention. As shown in FIG. 3, the constant voltage control circuit / charge control voltage setting circuit 302 performs the charge control voltage setting, and the inverted output detection circuit 305 outputs the output of the constant voltage control circuit / charge control voltage setting circuit 302. This is to detect an inverted operation of the.

前記実施の形態１で示した動作と同様に充電中の電池が設定された充電制御電圧に達し、設定された終了電流を検出した場合は、一旦充電を休止し実用充電完了判定を行う。このとき、出力電流は停止しているため電池電圧は充電制御電圧より低い関係にあり前記の定電圧制御回路／充電制御電圧設定回路３０２は動作していない。   Similar to the operation described in the first embodiment, when the battery being charged reaches the set charge control voltage and detects the set end current, the charging is temporarily stopped and the completion of the practical charge is determined. At this time, since the output current is stopped, the battery voltage is lower than the charge control voltage, and the constant voltage control circuit / charge control voltage setting circuit 302 is not operating.

また、充電中、電池温度の変化により充電制御電圧が下がった場合には充電電流は設定されている終了電流まで低下するため、一旦充電を休止し実用充電完了判定を行う。   In addition, when the charging control voltage is lowered due to a change in battery temperature during charging, the charging current is reduced to the set end current.

実用充電完了判定において、電池電圧が充電制御電圧を超える条件下においては、前記の定電圧制御回路／充電制御電圧設定回路３０２の動作は反転するため、その動作を反転出力検出回路３０５によって検出し制御ロジック３０７に信号を送り、充電スイッチ３０８をＯＦＦに切り替えることでフロート充電を終了させている。   When the battery voltage exceeds the charge control voltage in the practical charge completion determination, the operation of the constant voltage control circuit / charge control voltage setting circuit 302 is inverted, and the operation is detected by the inverted output detection circuit 305. Float charging is terminated by sending a signal to the control logic 307 and switching the charging switch 308 to OFF.

図７は実施の形態２または３で示した充電制御装置における充電フロー図であり、急速充電中は温度によって充電制御電圧を切り替え、充電電流が充電終了電流設定値に達すると実用充電完了判定を行い、充電制御電圧と電池電圧を比較し、フロート充電に移行またはフロート充電を飛ばすように構成し、その後充電完了となる。   FIG. 7 is a charge flow chart in the charge control device shown in the second or third embodiment. During the quick charge, the charge control voltage is switched depending on the temperature, and when the charge current reaches the charge end current set value, the practical charge completion determination is made. The charge control voltage and the battery voltage are compared, and the configuration is such that the shift to the float charge or the float charge is skipped, and then the charge is completed.

本発明にかかる充電制御装置によれば、二次電池に対し定電流充電制御及び定電圧充電制御を行い、充電中に電池温度に応じて充電制御電圧を切り替る機能を有し、かつ充電電流が終了電流に達した場合は、実用充電完了判定を行い、補充電としてさらにフロート充電を継続する充電制御装置において、電池電圧が充電制御電圧を超える条件下でフロート充電中に電池から充電制御回路へ電流が逆流することを防止している。   The charge control device according to the present invention has a function of performing constant current charge control and constant voltage charge control on the secondary battery, switching the charge control voltage according to the battery temperature during charging, and charging current. When the battery reaches the end current, the charge control device that determines the completion of the practical charge and continues the float charge as a supplementary charge, the charge control circuit from the battery during the float charge under the condition that the battery voltage exceeds the charge control voltage This prevents the current from flowing backward.

また、実用充電完了検出時に電池電圧の値および充電制御電圧設定の値を比較し、ロジック回路を制御することでフロート充電を終了させることで、電池から充電制御回路へ電流が逆流することを防止している。   In addition, the battery voltage value and the charge control voltage setting value are compared when the completion of practical charge is detected, and the float charge is terminated by controlling the logic circuit, preventing current from flowing backward from the battery to the charge control circuit. doing.

さらに、１つのコンパレータが定電圧制御回路と充電制御電圧設定の機能を兼ね備えた回路構成とし、実用充電完了判定時に定電圧制御回路の出力が反転していることを検知するように構成した場合は、大幅な回路変更や回路追加を伴うことなく高精度に電池電圧と充電制御電圧の比較を行い、電池から充電制御回路への逆流を防ぐことが可能となる。   In addition, when one comparator has a circuit configuration that has both a constant voltage control circuit and a charge control voltage setting function, and when it is configured to detect that the output of the constant voltage control circuit is inverted when a practical charge completion determination is made, The battery voltage and the charge control voltage can be compared with high accuracy without significant circuit change or circuit addition, and backflow from the battery to the charge control circuit can be prevented.

すなわち、充電中において電池から充電制御回路への逆流を防ぐことは、充電制御回路の劣化や故障、または充電中にもかかわらず電池の容量が低下するといった現象を防ぐことができ、製品の安全性およびユーザーの利便性を向上させることができる。   In other words, preventing reverse flow from the battery to the charging control circuit during charging can prevent the deterioration or failure of the charging control circuit, or the phenomenon that the capacity of the battery decreases even during charging. And user convenience can be improved.

本発明の実施の形態１を示す電気回路ブロック図Electrical circuit block diagram showing Embodiment 1 of the present invention 本発明の実施の形態２を示す電気回路ブロック図Electric circuit block diagram showing Embodiment 2 of the present invention 本発明の実施の形態３を示す電気回路ブロック図Electric circuit block diagram showing Embodiment 3 of the present invention 従来技術の実施の形態を示す電気回路ブロック図Electric circuit block diagram showing an embodiment of the prior art 従来技術の特開平０９‐１４７９２１から引用した電気回路ブロック図Electric circuit block diagram cited from the prior art Japanese Patent Laid-Open No. 09-147922 本発明の実施の形態１を示す充電フロー図Charging flow chart showing Embodiment 1 of the present invention 本発明の実施の形態２または形態３を示す充電フロー図Charging flow chart showing Embodiment 2 or Embodiment 3 of the present invention 従来技術の実施の形態を示す充電フロー図Charge flow diagram showing an embodiment of the prior art

符号の説明Explanation of symbols

１ ＤＣ／ＤＣコンバータ機構の主回路
３ 電池
６ 誤差増幅器
９ 出力電圧設定
１２ 誤差増幅器
１９ サーミスタ
２２ マイクロプロセッサー
１０１ 定電流制御用コンパレータ（ＣＣ）
１０２ 定電圧制御用コンパレータ（ＣＶ）
１０３ ＯＲ回路
１０４ 帰還回路
１０５ 電池逆流検出回路
１０６ 電池温度検出回路
１０７ 制御ロジック
１０８ 充電スイッチ
２０１ 定電流制御用コンパレータ（ＣＣ）
２０２ 定電圧制御用コンパレータ（ＣＶ）
２０３ ＯＲ回路
２０４ 帰還回路
２０５ コンパレータ（ＶＣ）
２０６ 電池温度検出回路
２０７ 制御ロジック
２０８ 充電スイッチ
３０１ 定電流制御用コンパレータ（ＣＣ）
３０２ 定電圧制御回路／充電制御電圧設定回路
３０３ ＯＲ回路
３０４ 帰還回路
３０５ 反転出力検出回路
３０６ 電池温度検出回路
３０７ 制御ロジック
３０８ 充電スイッチ
４０１ 定電流制御用コンパレータ（ＣＣ）
４０２ 定電圧制御用コンパレータ（ＣＶ）
４０３ ＯＲ回路
４０４ 帰還回路
４０５ 充電制御電圧設定
４０６ 電池温度検出回路
４０７ 制御ロジック
４０８ 充電スイッチ DESCRIPTION OF SYMBOLS 1 Main circuit of DC / DC converter mechanism 3 Battery 6 Error amplifier 9 Output voltage setting 12 Error amplifier 19 Thermistor 22 Microprocessor 101 Constant current control comparator (CC)
102 Comparator for constant voltage control (CV)
DESCRIPTION OF SYMBOLS 103 OR circuit 104 Feedback circuit 105 Battery backflow detection circuit 106 Battery temperature detection circuit 107 Control logic 108 Charge switch 201 Comparator for constant current control (CC)
202 Constant voltage control comparator (CV)
203 OR circuit 204 Feedback circuit 205 Comparator (VC)
206 Battery Temperature Detection Circuit 207 Control Logic 208 Charge Switch 301 Constant Current Control Comparator (CC)
302 Constant Voltage Control Circuit / Charge Control Voltage Setting Circuit 303 OR Circuit 304 Feedback Circuit 305 Inverted Output Detection Circuit 306 Battery Temperature Detection Circuit 307 Control Logic 308 Charge Switch 401 Constant Current Control Comparator (CC)
402 Constant voltage control comparator (CV)
403 OR circuit 404 feedback circuit 405 charge control voltage setting 406 battery temperature detection circuit 407 control logic 408 charge switch

Claims (3)

電池パックの温度状態により充電電圧の設定値を切り替る充電制御装置において、
充電電流を一定に制御するための定電流制御用コンパレータ（ＣＣ）と、
充電電圧を一定に制御するための定電圧制御用コンパレータ（ＣＶ）と、
前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力するＯＲ回路と、
前記ＯＲ回路からの信号を受け動作する帰還回路と、
前記電池パックから充電制御回路への逆流を検出する電池逆流検出回路と、
前記電池パックに内設されたサーミスタ抵抗により温度を検出する電池温度検出回路と、
前記電池逆流検出回路および前記電池温度検出回路からの信号を受け充電制御を行う制御ロジックと、
前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り替る充電スイッチとからなり、
当該充電制御装置により前記電池パックを充電中、前記電池パックの温度変化によって充電電圧値が切り換り充電電流が充電終了電流まで低下したとき、
前記制御ロジックは一旦充電を休止して実用充電完了判定を行った後、前記電池逆流検出回路で検出した逆流がない場合は前記充電スイッチをＯＮにしてフロート充電を行い、前記電池逆流検出回路で検出した逆流がある場合は前記充電スイッチをＯＦＦにすることを特徴とする充電制御装置。 In charging control device that switches the set value of the charge current pressure by the temperature state of the battery pack,
A constant current control comparator (CC) for controlling the charging current to be constant;
And constant voltage control comparator for controlling the charging voltage constant (CV),
An OR circuit that outputs signals by the operations of the constant current control comparator (CC) and the constant voltage control comparator (CV);
A feedback circuit that operates in response to a signal from the OR circuit;
A battery reverse current detector circuit for detecting a backflow into the charge control circuit from the battery pack,
A battery temperature detecting circuit for detecting the temperature by the thermistor resistor is provided inside the battery pack,
A control logic for controlling charging by receiving signals from the battery backflow detection circuit and the battery temperature detection circuit;
Consists of a charging switch for switching the ON-OFF of the charging receiving a signal from said control logic,
The charging of the battery pack, when the temperature change of the previous SL batteries pack off the charge current pressure value換Ri charge current drops to charge termination current by the charge control device,
After the control logic has Tsu row practical charging completion determination paused charging once, if there is no back flow detected by the battery reverse current detector circuit performs float charge in the ON the charging switch, the battery reverse current detector circuit When there is a backflow detected in step (b), the charging switch is turned off . 電池パックの温度状態により充電電圧の設定値を切り替る充電制御装置において、
充電電流を一定に制御するための定電流制御用コンパレータ（ＣＣ）と、
充電電圧を一定に制御するための定電圧制御用コンパレータ（ＣＶ）と、
前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力するＯＲ回路と、
前記ＯＲ回路からの信号を受け動作する帰還回路と、
前記電池パックに内設されたサーミスタ抵抗により温度を検出する電池温度検出回路と、
前記温度により充電電圧を切り換える充電電圧設定部と、
前記充電電圧設定部および前記電池温度検出回路からの信号を受け充電制御を行う制御ロジックと、
前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り替る充電スイッチとからなり、
当該充電制御装置により前記電池パックを充電中、前記電池パックの温度変化によって前記充電電圧設定部が充電電圧値を切り換え、充電電流が充電終了電流まで低下したとき、
前記制御ロジックは一旦充電を休止して実用充電完了判定を行った後、前記電池パックの電圧値が温度変化によって切り換った充電電圧値を超えない場合は前記充電スイッチをＯＮにしてフロート充電を行い、前記電池パックの電圧値が温度変化によって切り換った充電電圧値を超える場合は前記充電スイッチをＯＦＦにすることを特徴とする充電制御装置。 In the charging control device that switches the setting value of the charging voltage depending on the temperature state of the battery pack,
A constant current control comparator (CC) for controlling the charging current to be constant;
A constant voltage control comparator (CV) for controlling the charging voltage to be constant;
An OR circuit that outputs signals by the operations of the constant current control comparator (CC) and the constant voltage control comparator (CV);
A feedback circuit that operates in response to a signal from the OR circuit;
A battery temperature detection circuit for detecting a temperature by a thermistor resistance provided in the battery pack;
A charging voltage setting unit that switches the charging voltage according to the temperature;
A control logic for performing charge control in response to signals from the charge voltage setting unit and the battery temperature detection circuit;
It consists of a charge switch that receives a signal from the control logic and switches charging ON-OFF,
Wherein by the charge control device in charging a battery pack, prior Symbol batteries the charging voltage setting unit by temperature change For switching charge current pressure value of the pack, when the charging current drops to the end of charging current,
After the control logic has Tsu row practical charging completion determination paused charging once, when the voltage value of the battery pack does not exceed the charging voltage value Tsu cut conversion by temperature changes in the ON the charging switch float was charged, the battery pack voltage value charging controller you characterized in that the OFF the charging switch when it exceeds the charging voltage value Tsu conversion cut by temperature change. 電池パックの温度状態により充電電圧の設定値を切り替る充電制御装置において、
充電電流を一定に制御するための定電流制御用コンパレータ（ＣＣ）と、
充電電圧を一定に制御するための定電圧制御用コンパレータ（ＣＶ）と、
前記定電流制御用コンパレータ（ＣＣ）および前記定電圧制御用コンパレータ（ＣＶ）の動作によって信号を出力するＯＲ回路と、
前記ＯＲ回路からの信号を受け動作する帰還回路と、
前記電池パックに内設されたサーミスタ抵抗により温度を検出する電池温度検出回路と、
前記定電圧制御用コンパレータ（ＣＶ）から前記電池パックの電圧値が前記充電電圧を超えた反転動作であるか検出する反転出力検出回路と、
前記充電電圧設定部および前記電池温度検出回路からの信号を受け充電制御を行う制御ロジックと、
前記制御ロジックからの信号を受け充電のＯＮ−ＯＦＦを切り替る充電スイッチとからなり、
当該充電制御装置により前記電池パックを充電中、前記電池パックの温度変化によって充電電圧値が切り換り充電電流が充電終了電流まで低下したとき、
前記制御ロジックは一旦充電を休止して実用充電完了判定を行った後、前記反転出力検出回路の出力が反転動作でない場合は前記充電スイッチをＯＮにしてフロート充電を行い、前記反転出力検出回路の出力が反転動作である場合は前記充電スイッチをＯＦＦにすることを特徴とする充電制御装置。
 In the charging control device that switches the setting value of the charging voltage depending on the temperature state of the battery pack,
A constant current control comparator (CC) for controlling the charging current to be constant;
A constant voltage control comparator (CV) for controlling the charging voltage to be constant;
An OR circuit that outputs signals by the operations of the constant current control comparator (CC) and the constant voltage control comparator (CV);
A feedback circuit that operates in response to a signal from the OR circuit;
A battery temperature detection circuit for detecting a temperature by a thermistor resistance provided in the battery pack;
An inversion output detection circuit for detecting whether the voltage value of the battery pack is an inversion operation exceeding the charge voltage from the constant voltage control comparator (CV);
A control logic for performing charge control in response to signals from the charge voltage setting unit and the battery temperature detection circuit;
It consists of a charge switch that receives a signal from the control logic and switches charging ON-OFF,
The charging of the battery pack, when the by temperature change of the battery pack off the charge current pressure value換Ri charge current drops to charge termination current by the charge control device,
After the control logic has Tsu row practical charging completion determination paused charging once when the output of the inverting output detection circuit is not inverted operation performs float charge in the ON the charging switch, the inverting output detection circuit output charging controller you wherein if a reverse operation is possible to OFF the charging switch.
JP2008230775A 2008-09-09 2008-09-09 Charge control device Expired - Fee Related JP5407234B2 (en)

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