TWI473389B - Charger circuit and charging control method - Google Patents
Charger circuit and charging control method Download PDFInfo
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本發明係有關一種充電器電路及充電控制方法,特別是指一種感測電池電量的充電器電路及充電控制方法。The invention relates to a charger circuit and a charging control method, in particular to a charger circuit and a charging control method for sensing battery power.
請參考第1圖,其示出一種先前技術之充電器電路1之示意圖。其中,電源供應器11將輸入端的輸入電壓轉換為輸出端的輸出電壓,而輸出端則經由電流供應電路12提供電流對電池電路14充電。Please refer to FIG. 1, which shows a schematic diagram of a prior art charger circuit 1. Among them, the power supply 11 converts the input voltage of the input terminal into the output voltage of the output terminal, and the output terminal supplies the current to the battery circuit 14 via the current supply circuit 12.
電源供應電路11和電流供應電路12由控制電路16控制,當電壓偵測電路15偵測電池電路14的電壓尚未達到預設電壓時,控制電路16控制電流供應電路12以固定電流對電池電路14充電,亦即調節控制的標的以電流為主,稱為恆流模式;而當電壓偵測電路15偵測電池電路14的電壓達到預設電壓時,調節控制的標的改以電壓為主,電流供應電路12對電池電路14的充電電流逐漸下降,直到電池電壓到達預設電壓目標,稱為恆壓模式。The power supply circuit 11 and the current supply circuit 12 are controlled by the control circuit 16. When the voltage detecting circuit 15 detects that the voltage of the battery circuit 14 has not reached the preset voltage, the control circuit 16 controls the current supply circuit 12 to fix the current to the battery circuit 14. Charging, that is, the standard of the regulation control is mainly current, which is called constant current mode; and when the voltage detecting circuit 15 detects that the voltage of the battery circuit 14 reaches the preset voltage, the standard of the adjustment control is changed to voltage, current The charging current of the supply circuit 12 to the battery circuit 14 gradually decreases until the battery voltage reaches a preset voltage target, which is referred to as a constant voltage mode.
然而,此種利用量測電池電壓,在恆流模式後轉換為恆壓模式的充電器電路1,所需要的充電時間相對較長。其原因請參閱第4A與第4B圖,在時間點t1,電壓偵測電路15偵測電池電路14的電壓達到預設電壓V1,開始切換為恆壓模式,因此,充電電流開始逐漸下降。然而,由於電池內部寄生電阻的效應,當偵測電壓到達預設電壓V1時,電池內部電壓事實上並未真正到達預設電壓V1,但已切換為恆壓模式,在此期間充電電流在下降,這使得充電的過程相對較長。However, such a use of measuring the battery voltage, after switching to the constant voltage mode of the charger circuit 1 in the constant current mode, requires a relatively long charging time. For the reason, please refer to FIG. 4A and FIG. 4B. At time t1, the voltage detecting circuit 15 detects that the voltage of the battery circuit 14 reaches the preset voltage V1 and starts switching to the constant voltage mode. Therefore, the charging current starts to gradually decrease. However, due to the effect of the internal parasitic resistance of the battery, when the detection voltage reaches the preset voltage V1, the internal voltage of the battery does not actually reach the preset voltage V1, but has been switched to the constant voltage mode, during which the charging current is decreasing. This makes the charging process relatively long.
一種先前技術為縮短充電時間,因此會對電池內部的寄生電阻加以偵測,如第5圖先前技術之充電控制流程圖所示,在此先前技術中,首先選擇第一階段恆流模式對電池充電,當電池電壓達到預設電壓V1時,量測電池內部的寄生電阻,也就是電池內部電阻RBAT;接著,根據偵測到的電池內部電阻RBAT,將電池電壓的目標設定,自預設電壓V1調高至預設電壓V2,且V2=V1+IA*RBAT,其中,IA為電池電壓達到預設電壓V1後,選擇第二恆流模式之充電電流IBAT;接著,當電池電壓達到預設電壓V2時,再將電池電壓的目標設定調回至V1。此種先前技術是採用兩階段的恆流模式對電池充電,也就是在電池電壓達到預設電壓V1以前,選擇第一階段的恆流模式,而在電池電壓達到預設電壓V1以後到預設電壓V2之間,選擇第二階段的恆流模式,最後再將電池電壓的目標設定調回至V1,以恆壓模式維持電池電壓。One prior art is to shorten the charging time, and thus to detect the parasitic resistance inside the battery, as shown in the charging control flow chart of the prior art of FIG. 5, in the prior art, first select the first stage constant current mode for the battery. Charging, when the battery voltage reaches the preset voltage V1, measure the internal parasitic resistance of the battery, that is, the internal resistance of the battery RBAT; then, according to the detected internal resistance RBAT of the battery, set the target of the battery voltage, from the preset voltage V1 is raised to a preset voltage V2, and V2=V1+IA*RBAT, wherein, after the battery voltage reaches the preset voltage V1, the charging current IBAT of the second constant current mode is selected; then, when the battery voltage reaches the preset When the voltage is V2, the target setting of the battery voltage is adjusted back to V1. This prior art uses a two-stage constant current mode to charge the battery, that is, to select the first-stage constant current mode before the battery voltage reaches the preset voltage V1, and to preset after the battery voltage reaches the preset voltage V1. Between the voltages V2, the second-stage constant current mode is selected, and finally the target setting of the battery voltage is adjusted back to V1 to maintain the battery voltage in the constant voltage mode.
此種先前技術的缺點是,若量測的電阻誤差太大,會在第二恆流模式中,設定錯誤的充電電流IBAT,而導致充電器電路的損壞與安全性的問題,有鑑於此,本發明即針對上述先前技術之不足,提出一種充電器電路及充電控制方法,可根據充電電池的電量與實際需求選擇充電模式,以節省充電時間,並可避免充電器電路的損壞與安全性的問題。A disadvantage of this prior art is that if the measured resistance error is too large, the wrong charging current IBAT is set in the second constant current mode, which causes damage and safety of the charger circuit, and in view of this, The present invention is directed to the deficiencies of the prior art described above, and provides a charger circuit and a charging control method, which can select a charging mode according to the power consumption of the rechargeable battery and actual needs, thereby saving charging time and avoiding damage and safety of the charger circuit. problem.
本發明目的之一在提供一種充電器電路。One of the objects of the present invention is to provide a charger circuit.
本發明另一目的在提供一種充電控制方法。Another object of the present invention is to provide a charging control method.
為達上述之目的,就其中一觀點言,本發明提供了一種 充電器電路,包含:一電源供應電路,用以將一輸入電壓轉換為一輸出電壓於一輸出端;一電流供應電路,耦接於該輸出端與一電池電路之間,以對該電池電路充電;一計量與電壓偵測電路,與該電池電路耦接,產生相關於該電池電壓之電壓偵測訊號,以及相關於該電池電量之電量感測訊號;以及一控制電路,根據該電壓偵測訊號和電量感測訊號,以產生控制訊號控制該電源供應電路和電流供應電路,其控制方式包含:當該電池電壓到達一預設電壓時,根據該電量感測訊號,以決定以恆流模式或以恆壓模式對該電池電路充電,在該恆流模式中充電之電流為第一固定電流值,在該恆壓模式中以電池電壓為調節目標。For the purposes of the above, in one aspect, the present invention provides a The charger circuit includes: a power supply circuit for converting an input voltage into an output voltage at an output; a current supply circuit coupled between the output terminal and a battery circuit to the battery circuit Charging; a metering and voltage detecting circuit coupled to the battery circuit to generate a voltage detecting signal related to the battery voltage, and a power sensing signal related to the battery power; and a control circuit according to the voltage detecting The signal signal and the power sensing signal are used to generate a control signal to control the power supply circuit and the current supply circuit. The control method includes: when the battery voltage reaches a predetermined voltage, sensing the signal according to the power to determine a constant current The battery circuit is charged in a mode or in a constant voltage mode, and the current charged in the constant current mode is a first fixed current value in which the battery voltage is adjusted.
在一種較佳的實施型態中,該計量與電壓偵測電路包括一伏打計量器(Voltaic Gauge)。In a preferred embodiment, the metering and voltage detecting circuit comprises a Voltaic Gauge.
本發明也提供了一種充電控制方法,包含:將一輸入電壓轉換為一輸出電壓於一輸出端;自該輸出端對一電池充電;偵測該電池電壓,當該偵測值到達一預設電壓時,量測該電池之電量,以產生一電量感測訊號,以決定以恆流模式或以恆壓模式對該電池電路,在該恆流模式中充電之電流為第一固定電流值,在該恆壓模式中以電池電壓為調節目標。The invention also provides a charging control method, comprising: converting an input voltage into an output voltage at an output; charging a battery from the output; detecting the battery voltage, when the detected value reaches a preset At the time of voltage, measuring the amount of the battery to generate a power sensing signal to determine the current in the constant current mode or in the constant voltage mode, and the current charged in the constant current mode is the first fixed current value. In this constant voltage mode, the battery voltage is used as an adjustment target.
在一種較佳的實施型態中,該方法更包含:當該電池電壓小於該預設電壓時,以第二固定電流值對該電池電路充電,其中該第二固定電流值等於或不等於該第一固定電流值。In a preferred embodiment, the method further includes charging the battery circuit with a second fixed current value when the battery voltage is less than the predetermined voltage, wherein the second fixed current value is equal to or not equal to the The first fixed current value.
在一種較佳的實施型態中,當該電池電壓到達該預設電壓時,該控制方法包含:(1)當該電量感測訊號小於一第一預設電量時,以該恆流模式對該電池電路充電,其中充電之電流為該第一固 定電流值,直到該電量感測訊號到達一第二預設電量;以及(2)當該電量感測訊號大於該第二預設電量時,以該恆壓模式對該電池電路充電,以調節該電池電壓於一目標電壓;其中,該第二預設電量大於該第一預設電量。In a preferred embodiment, when the battery voltage reaches the preset voltage, the control method includes: (1) when the power sensing signal is less than a first preset power, in the constant current mode pair The battery circuit is charged, wherein the charging current is the first solid Constant current value until the power sensing signal reaches a second preset power; and (2) when the power sensing signal is greater than the second preset power, charging the battery circuit in the constant voltage mode to adjust The battery voltage is at a target voltage; wherein the second predetermined power is greater than the first predetermined power.
在一種較佳的實施型態中,可於步驟(1)中,將電池電壓的調節目標暫時設定於一暫時目標值,該暫時目標值高於該預設電壓。In a preferred embodiment, in step (1), the adjustment target of the battery voltage is temporarily set to a temporary target value, and the temporary target value is higher than the preset voltage.
如令該預設電壓V1、該暫時目標值為V2、該目標電壓為V3,則在一種較佳的實施型態中,V1V3V2。If the preset voltage V1, the temporary target value is V2, and the target voltage is V3, in a preferred embodiment, V1 V3 V2.
底下藉由具體實施例詳加說明,當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。The purpose, technical content, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments.
請參閱第3圖,其顯示本發明一個實施例之充電器電路2的示意圖。本實施例之充電器電路2用以對電池電路24充電,其包含電源供應電路21、電流供應電路22、電壓偵測電路15、計量器25、與控制電路26。其中,控制電路26控制電源供應電路21與電流供應電路22,以將輸入端電壓轉換為輸出端電壓,並對電池電路23充電。計量器25與電池電路23耦接,當電池電壓到達預設電壓V1時,量測電池之電量,以產生電量感測訊號。電壓偵測電路15用以偵測電池電壓,若計量器25也可提供電池電壓的資訊,則電壓偵測電路15可以省略,或視為計量器25包含電壓偵測電路15。控制電路26根據電池電壓資訊及電量感測訊號,以產生控制訊號並選擇模 式;其根據以下狀況,調整該控制訊號:(1)當電量感測訊號小於預設電量X%時,控制訊號以恆流模式控制電源供應電路21與電流供應電路22,直到電量感測訊號到達預設電量Y%;以及(2)當電量感測訊號大於預設電量Y%時,控制訊號以恆壓模式控制電源供應電路21與電流供應電路22,以調節電池電壓於預設電壓V1;其中,預設電量Y%大於預設電量X%。Referring to Figure 3, there is shown a schematic diagram of a charger circuit 2 in accordance with one embodiment of the present invention. The charger circuit 2 of this embodiment is used to charge the battery circuit 24, and includes a power supply circuit 21, a current supply circuit 22, a voltage detection circuit 15, a meter 25, and a control circuit 26. The control circuit 26 controls the power supply circuit 21 and the current supply circuit 22 to convert the input terminal voltage into an output terminal voltage and charge the battery circuit 23. The meter 25 is coupled to the battery circuit 23, and when the battery voltage reaches the preset voltage V1, measures the amount of power of the battery to generate a power sensing signal. The voltage detecting circuit 15 is for detecting the battery voltage. If the meter 25 can also provide the battery voltage information, the voltage detecting circuit 15 can be omitted, or the meter 25 can be regarded as including the voltage detecting circuit 15. The control circuit 26 generates a control signal and selects a mode according to the battery voltage information and the power sensing signal. The control signal is adjusted according to the following conditions: (1) When the power sensing signal is less than the preset power X%, the control signal controls the power supply circuit 21 and the current supply circuit 22 in a constant current mode until the power sensing signal The preset power amount Y% is reached; and (2) when the power sensing signal is greater than the preset power amount Y%, the control signal controls the power supply circuit 21 and the current supply circuit 22 in the constant voltage mode to adjust the battery voltage to the preset voltage V1. Wherein, the preset power amount Y% is greater than the preset power amount X%.
其中,X與Y例如但不限於分別介於50~90之間與70~99之間,只要Y>X即可。另外,在恆流模式中,充電電流實質上調節於一固定電流;而在恆壓模式中,電池電壓實質上調節於一固定電壓,例如但不限於預設電壓V1(亦可為V1正負一差異值)。又,電源供應電路21例如可以為如第2A-2J圖所示之同步或非同步之降壓型、升壓型、反壓型、或升降壓型功率轉換電路。Wherein, X and Y are, for example but not limited to, between 50 and 90 and between 70 and 99, respectively, as long as Y>X. In addition, in the constant current mode, the charging current is substantially adjusted to a fixed current; and in the constant voltage mode, the battery voltage is substantially adjusted to a fixed voltage, such as but not limited to the preset voltage V1 (may also be a positive or negative V1) Difference value). Further, the power supply circuit 21 may be, for example, a synchronous or non-synchronous step-down, step-up, back-pressure, or step-up/down type power conversion circuit as shown in Figs. 2A-2J.
請參閱第4A-4C圖,其顯示先前技術與根據本發明的實施例所產生之充電電流與電池電壓波形的示意圖。根據本發明的實施例,當偵測電池電壓尚未達到預設電壓V1時,以恆流模式充電。當偵測電池電壓達到預設電壓V1(實際的電池電壓尚未達到預設電壓V1)時,量測電池之電量,當電量感測訊號小於預設電量X%時,仍選擇恆流模式,持續以固定的電流對電池充電,直到電量感測訊號到達預設電量Y%,此時電池電壓會略微上升超過預設電壓V1,因迴路設定以電流為主要控制標的,故超過預設電壓V1亦無妨,但如為安全起見顧慮電路中電流和電壓的回授控制產生衝突,則可暫時將電池電壓的調節目標設在高於預設電壓V1的任何預設電壓V2,目 的並非以預設電壓V2為調節的目標,而是讓電路能以恆流模式操作。當電量感測訊號大於預設電量Y%時,才選擇恆壓模式,此時可將電池電壓的目標值設於預設電壓V3,V1V3V2,其中預設電壓V3例如可以等於預設電壓V1(第4C圖以此為例,但不受此限),亦可以為不低於預設電壓V1之其他電壓,而電池電壓將被調節於此目標值。Please refer to FIGS. 4A-4C, which show schematic diagrams of prior art and charge current and battery voltage waveforms generated in accordance with embodiments of the present invention. According to an embodiment of the invention, when the detected battery voltage has not reached the preset voltage V1, it is charged in the constant current mode. When the detected battery voltage reaches the preset voltage V1 (the actual battery voltage has not reached the preset voltage V1), the battery power is measured. When the power sensing signal is less than the preset power X%, the constant current mode is still selected. Charge the battery with a fixed current until the power sensing signal reaches the preset power Y%. At this time, the battery voltage will rise slightly above the preset voltage V1. Because the circuit is set to the current as the main control target, the preset voltage V1 is also exceeded. No problem, but if it is safe to worry about the conflict between the current and voltage feedback control in the circuit, the battery voltage can be temporarily set to any preset voltage V2 higher than the preset voltage V1, not intended to be preset. Voltage V2 is the target of regulation, but allows the circuit to operate in constant current mode. When the power sensing signal is greater than the preset power Y%, the constant voltage mode is selected. At this time, the target value of the battery voltage can be set to the preset voltage V3, V1. V3 V2, wherein the preset voltage V3 can be equal to, for example, the preset voltage V1 (the 4C figure is taken as an example, but is not limited thereto), and may be other voltages not lower than the preset voltage V1, and the battery voltage will be adjusted. This target value.
比較第4A圖中,本發明與先前技術的充電電流波形可以看出,根據本發明之實施例的充電電流較晚下降,但較早停止充電(假設當充電電流低於臨界值時,代表充電完成),因此,相較於先前技術,本發明較早完成充電,也就是說本發明的充電時間較短。此外,由於本發明的充電模式中,恆流模式只需設置一種固定的充電電流,因此電路的製造成本較低。另外,本發明避免了內部電阻的計算錯誤,降低電路損壞(及安全性)的風險。以上皆是本發明優於先前技術之處。Comparing Fig. 4A, the present invention and the prior art charging current waveform can be seen that the charging current according to the embodiment of the present invention is relatively late, but stops charging earlier (assuming charging current is lower than the critical value, representing charging) This is done, therefore, the present invention completes charging earlier than the prior art, that is, the charging time of the present invention is shorter. In addition, since the constant current mode only needs to set a fixed charging current in the charging mode of the present invention, the manufacturing cost of the circuit is low. In addition, the present invention avoids calculation errors of internal resistance and reduces the risk of circuit damage (and safety). All of the above are advantages of the present invention over the prior art.
須說明的是,本發明係根據電池電量作為控制充電模式的主要參數,計量器例如但不限於為伏打計量器(Voltaic Gauge),其為一種根據電池電壓或/與充電電流對照所得的一種電量指標,相關於電池中所儲存的電量,其為本技術領域中,具有通常技術者所熟知,在此不予贅述。It should be noted that the present invention is based on the battery power as a main parameter for controlling the charging mode, and the meter is, for example but not limited to, a Voltaic Gauge, which is a kind based on battery voltage or/and charging current. The power indicator, which is related to the amount of power stored in the battery, is well known to those of ordinary skill in the art and will not be described herein.
第6圖顯示根據本發明的一個實施例之充電控制流程圖,如圖所示,首先選擇恆流模式對電池充電,當電池電壓達到預設電壓V1時,量測電池的電量;接著,根據偵測到的電池電量,當電量少於X%,則繼續保持恆流模式之充電電流,且在必要時,可將電池電壓的目標設定,自預設電壓V1調高至預設電壓V2;接著,當電池電量達到Y%時,再將電池電壓的目標設定降低至V3。參閱第4A圖與第6圖,此種根據 本發明之充電方式,是採用一階段的恆流模式對電池充電,也就是在電池電壓達到預設電壓V1以前,至電池電量達到Y%之間,保持同一階段的恆流模式,最後再將電池電壓的目標設定調至V3,其中V3>=V1,在電池電量達到Y%後,以恆壓模式維持電池電壓至V3。但以上所述僅是其中一個實施方式,參閱第4A圖,在偵測到電池電壓到達預設電壓V1之前與之後,亦即在時間t1之前與之後,本發明這兩階段模式中的充電電流設定值不必須相同,亦可為不同。Figure 6 is a flow chart showing the charging control according to an embodiment of the present invention. As shown in the figure, the constant current mode is first selected to charge the battery, and when the battery voltage reaches the preset voltage V1, the battery is measured; subsequently, according to The detected battery power, when the power is less than X%, continue to maintain the constant current mode charging current, and if necessary, the battery voltage target can be set, from the preset voltage V1 to the preset voltage V2 Then, when the battery reaches Y%, the target voltage of the battery is lowered to V3. See Figures 4A and 6 for such a basis. The charging method of the invention adopts a one-stage constant current mode to charge the battery, that is, before the battery voltage reaches the preset voltage V1, until the battery power reaches Y%, maintaining the same stage of the constant current mode, and finally The target setting of the battery voltage is adjusted to V3, where V3>=V1, after the battery reaches Y%, the battery voltage is maintained to V3 in constant voltage mode. However, the above description is only one of the embodiments. Referring to FIG. 4A, the charging current in the two-stage mode of the present invention is detected before and after detecting that the battery voltage reaches the preset voltage V1, that is, before and after the time t1. The set values do not have to be the same or they can be different.
以上已針對較佳實施例來說明本發明,唯以上所述者,僅係為使熟悉本技術者易於了解本發明的內容而已,並非用來限定本發明之權利範圍。在本發明之相同精神下,熟悉本技術者可以思及各種等效變化。例如,在所示各實施例電路中,可插入不影響訊號主要意義的元件,如其他開關等;凡此種種,皆可根據本發明的教示類推而得,因此,本發明的範圍應涵蓋上述及其他所有等效變化。此外,本發明的任一實施型態不必須達成所有的目的或優點,因此,請求專利範圍任一項也不應以此為限。The present invention has been described with reference to the preferred embodiments thereof, and the present invention is not intended to limit the scope of the present invention. In the same spirit of the invention, various equivalent changes can be conceived by those skilled in the art. For example, in the circuits of the various embodiments shown, elements that do not affect the main meaning of the signal, such as other switches, etc., can be inserted; all of these can be derived in accordance with the teachings of the present invention, and thus the scope of the present invention should encompass the above. And all other equivalent changes. In addition, any embodiment of the present invention is not required to achieve all of the objects or advantages, and therefore, any one of the claims is not limited thereto.
1,2‧‧‧充電器電路1,2‧‧‧Charger circuit
11,21‧‧‧電源供應電路11,21‧‧‧Power supply circuit
12,22‧‧‧電流供應電路12,22‧‧‧ Current supply circuit
14,24‧‧‧電池電路14,24‧‧‧Battery Circuit
15‧‧‧電壓偵測電路15‧‧‧Voltage detection circuit
16,26‧‧‧控制電路16,26‧‧‧Control circuit
25‧‧‧計量器25‧‧‧meter
第1圖顯示一種先前技術之充電器電路1之示意圖。Figure 1 shows a schematic diagram of a prior art charger circuit 1.
第2A-2J圖顯示同步或非同步之降壓型、升壓型、反壓型、或升降壓型功率轉換電路。Figure 2A-2J shows a synchronous or non-synchronous buck, boost, back-pressure, or buck-boost power conversion circuit.
第3圖顯示本發明一個實施例。Figure 3 shows an embodiment of the invention.
第4A-4C圖顯示先前技術與根據本發明的實施例所產生之充電電流與電池電壓波形的示意圖4A-4C are schematic views showing the prior art and the charging current and battery voltage waveforms generated in accordance with an embodiment of the present invention.
第5圖顯示先前技術之充電控制流程圖。Figure 5 shows a prior art charge control flow chart.
第6圖顯示根據本發明之充電控制流程圖。Figure 6 shows a flow chart of the charging control in accordance with the present invention.
2‧‧‧充電器電路2‧‧‧Charger circuit
15‧‧‧電壓偵測電路15‧‧‧Voltage detection circuit
21‧‧‧電源供應器21‧‧‧Power supply
22‧‧‧電流供應電路22‧‧‧ Current supply circuit
24‧‧‧電池電路24‧‧‧Battery Circuit
25‧‧‧計量器25‧‧‧meter
26‧‧‧控制電路26‧‧‧Control circuit
Claims (9)
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TWI473389B true TWI473389B (en) | 2015-02-11 |
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CN105634050B (en) * | 2014-11-28 | 2020-12-18 | 鸿富锦精密电子(郑州)有限公司 | Charging system and control method thereof |
Citations (5)
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TW362301B (en) * | 1998-01-29 | 1999-06-21 | Chartec Lab As | Method and apparatus for charging a rechargeable battery |
JP2000324714A (en) * | 1999-05-14 | 2000-11-24 | Murata Mfg Co Ltd | Charging controller |
TW200518372A (en) * | 2003-11-28 | 2005-06-01 | Rohm Co Ltd | Charging device and portable electronic equipment comprising same |
CN1691461A (en) * | 2004-04-23 | 2005-11-02 | 索尼株式会社 | Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack |
CN101087032A (en) * | 2006-06-06 | 2007-12-12 | 株式会社理光 | Charging circuit, method of controlling operation of charging circuit, and power supply unit |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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TW362301B (en) * | 1998-01-29 | 1999-06-21 | Chartec Lab As | Method and apparatus for charging a rechargeable battery |
JP2000324714A (en) * | 1999-05-14 | 2000-11-24 | Murata Mfg Co Ltd | Charging controller |
TW200518372A (en) * | 2003-11-28 | 2005-06-01 | Rohm Co Ltd | Charging device and portable electronic equipment comprising same |
CN1691461A (en) * | 2004-04-23 | 2005-11-02 | 索尼株式会社 | Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack |
CN101087032A (en) * | 2006-06-06 | 2007-12-12 | 株式会社理光 | Charging circuit, method of controlling operation of charging circuit, and power supply unit |
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