TWI223487B - Power control device and the operating method thereof - Google Patents
Power control device and the operating method thereof Download PDFInfo
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- 238000011017 operating method Methods 0.000 title claims abstract 5
- 238000001514 detection method Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 15
- 239000004973 liquid crystal related substance Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 229910052987 metal hydride Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910005813 NiMH Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
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Abstract
Description
1223487 五、發明說明（1) 發明所屬之技術領域 本發明是有關於一種電源控制，且特別是有關於一種 以電池為電源的電源控制裝置及其運作方法。 先前技術 對於以電池為電源的可攜式電子裝置（如數位相機、 數位攝影機、或者是個人數位助理器）而言，電池電力存 量的偵測是非常重要的。先前的方法是直接量測電池正負 極兩端的電壓並檢查是否高於預設之截止電壓，作為判斷 電池電力是否足夠的依據。 但是對於不同種類的電池而言，其電池所屬的内阻特 性有所差異。以鹼性電池及鎳氫電池為例，鹼性電池之電 池内阻值係大於鎳氫電池之電池内阻。請參照第1圖，其 繪示的是驗性電池及鎳氫電池的放電曲線圖。由第1圖可 知，當可攜式電子裝置中的某一耗電元件啟動時，因為鹼 性電池之電池内阻值r 1係大於鎳氫電池之電池内阻值r 2， 所以在以驗性電池為電源的裝置中所造成的電池壓降會大 於使用錄氫電池所造成的電池壓降。若使用先前的方法在 耗電元件未開啟的狀況下直接量測電池電壓時，對於使用 鹼性電池的可攜式裝置而言，雖然電池電壓是高於截止電 壓，但在開啟耗電元件的情況下，電池電壓因内阻的存在 將會造成壓降，有可能落至截止電壓以下，此時若未能即 •時警示使用者電池電力已不足且必須即時更換電池，則耗 電元件啟動時，此裝置將因電力不足而有誤動作之虞。但 對於使用鎳氫電池的可攜式裝置而言，雖然在耗電元件未1223487 V. Description of the invention (1) Technical field to which the invention belongs The present invention relates to a power supply control, and more particularly, to a power supply control device using a battery as a power source and an operation method thereof. Prior art For battery-powered portable electronic devices (such as digital cameras, digital video cameras, or personal digital assistants), the detection of battery power is very important. The previous method is to directly measure the voltage across the positive and negative terminals of the battery and check whether it is higher than the preset cut-off voltage as a basis for judging whether the battery power is sufficient. However, for different types of batteries, the internal resistance characteristics of the batteries are different. Taking alkaline batteries and nickel-metal hydride batteries as examples, the internal resistance of alkaline batteries is greater than the internal resistance of nickel-metal hydride batteries. Please refer to Figure 1, which shows the discharge curves of the batteries and NiMH batteries. As can be seen from Figure 1, when a certain power-consuming component in a portable electronic device is started, because the internal resistance value r 1 of the alkaline battery is greater than the internal resistance value r 2 of the nickel-metal hydride battery, The battery voltage drop in a device with a battery as the power source will be greater than the battery voltage drop caused by the use of a hydrogen recording battery. If the previous method is used to directly measure the battery voltage when the power consumption element is not turned on, for portable devices using alkaline batteries, although the battery voltage is higher than the cut-off voltage, In the case, the battery voltage will cause a voltage drop due to the existence of internal resistance, and may fall below the cut-off voltage. At this time, if the user is not immediately notified that the battery power is insufficient and the battery must be replaced immediately, the power-consuming component starts. At this time, the device may malfunction due to insufficient power. However, for portable devices using nickel-metal hydride batteries,
11242twf.ptd 第5頁 1223487 五、發明說明（2) 開啟時所測得的電池電壓低於上述使用鹼性電池所測得的 電壓，但因内阻較低，故耗電元件開啟時所造成的電池壓 降較小，此時所量測得到的電池電壓甚而高於截止電壓， 亦即電池電力仍然足夠，此時裝置無須警示使用者。 因此，以習知的方法直接量測電池電壓將無法正確判斷電 池電力是否足夠。如此一來，使用者可能會因為無法得知 正確的電池電力存量，在電力不足時未能即時更換電池而 導致裝置誤動作。因此，如何能準確的偵測出電池的電力 存量而使使用者得知，是研究人員急需解決的問題之一。 發明内容 有鑑於此，本發明係提出一種電源控制裝置及其運 作方法。本發明是藉由電源控制裝置中的電池内阻檢測負 $電路，而得知可攜式電子裝置中的電池之電池内阻值。 藉此，可計算出可攜式電子裝置中的耗電元件在運作時， 在電池的正負極二端所造成的壓降，而能準確地偵測出電 池的電力存量。 為達成上述及其他目的，本發明提出一種電源控制裝 置。此電源控制裝置係適用於以電池作為電源的可攜式電 子裝置。此可攜式電子裝置係具有例如是閃光燈充電電 路、液晶顯示器背光驅動電路、鏡頭馬達驅動電路、或揚 聲器放大電路的耗電元件，但是熟習者此技藝當知，並不 •以此為限。此電源控制裝置包括電池内阻檢測負載電路、 類比至數位轉換器、以及中央處理單元。其申，電池内阻 檢測負載電路係耦接至電池及中央處理單元，用以檢測電11242twf.ptd Page 5 1223487 V. Description of the invention (2) The battery voltage measured when the battery is turned on is lower than the voltage measured using the alkaline battery described above, but the internal resistance is low, so the power consumption component is turned on. The voltage drop of the battery is small. At this time, the measured battery voltage is even higher than the cut-off voltage, that is, the battery power is still sufficient. At this time, the device does not need to warn the user. Therefore, directly measuring the battery voltage with conventional methods will not accurately determine whether the battery power is sufficient. As a result, the user may fail to know the correct battery power level and fail to replace the battery immediately when the power is low, which may cause the device to malfunction. Therefore, how to accurately detect the power of the battery and let the user know is one of the problems that researchers need to solve urgently. SUMMARY OF THE INVENTION In view of this, the present invention proposes a power supply control device and an operation method thereof. In the present invention, the internal resistance value of a battery in a portable electronic device is obtained by detecting the negative $ circuit of the internal resistance of the battery in the power control device. In this way, the voltage drop caused by the positive and negative terminals of the battery during the operation of the power-consuming components in the portable electronic device can be calculated, and the power reserve of the battery can be accurately detected. To achieve the above and other objects, the present invention provides a power control device. This power control device is suitable for a portable electronic device using a battery as a power source. This portable electronic device has a power consumption element such as a flash charging circuit, a liquid crystal display backlight driving circuit, a lens motor driving circuit, or a speaker amplifier circuit, but those skilled in the art know this technology and are not limited to this. The power control device includes a battery internal resistance detection load circuit, an analog-to-digital converter, and a central processing unit. In its application, the battery internal resistance detection load circuit is coupled to the battery and the central processing unit to detect the electrical
11242twf.ptd 第6頁 1223487 五、發明說明（3) 池的電池内阻。類比至數位轉換器係耦接至電池及中央處 理單元，用以將電池的類比電壓做類比至數位轉換，而輸 出數位電壓。而中央處理單元係耦接至電池内阻檢測負載 電路及數位至類比轉換器，用以控制電池内阻檢測負載電 路的關閉與開啟。當關閉電池内阻檢測負載電路而量測電 池時，中央處理單元會經由類比至數位轉換器而取得第一 電池電壓，而當開啟電池内阻檢測負載電路而量測電池 時，中央處理單元會經該由類比至數位轉換器而取得第二 電池電壓，依據第一電池電壓及第二電池電壓，可計算求 得電池中的電池内阻之電池内阻值。其中，依據第一電池 電壓、電池内阻值、以及耗電元件的耗電電流^能計算求 得電池的壓降電壓。當第一電池電壓減去壓降電壓係低於 預定截止電壓時，會警示可攜式電子裝置的使用者，並且 關閉可攜式電子裝置的電源。 在本發明的實施例中，電池内阻檢測負載電路包括電 阻及電晶體。其中，電阻具有第一端及第二端，其中電阻 的第一端係耦接至電池的一端。而電晶體具有第一源/汲 極、閘極、以及第二源/汲極，其中電晶體的第一源/汲極 係耦接至電阻的第二端，電晶體的閘極係耦接至中央處理 單元，而電晶體的第二源/汲極係耦接至電池的另一端。 在本發明的較佳實施例中，預定截止電壓可以調整。 在本發明的較佳實施例中，當第一電池電壓減去壓降 電壓係高於預定截止電壓時，則可攜式電子裝置會正常運 作，而不會發出「電池電壓不足的警示」。11242twf.ptd Page 6 1223487 V. Description of the Invention (3) Battery internal resistance of the battery. The analog-to-digital converter is coupled to the battery and the central processing unit, and performs analog-to-digital conversion on the battery's analog voltage and outputs the digital voltage. The central processing unit is coupled to the battery internal resistance detection load circuit and a digital-to-analog converter for controlling the closing and opening of the battery internal resistance detection load circuit. When the battery internal resistance detection load circuit is closed to measure the battery, the central processing unit obtains the first battery voltage through an analog-to-digital converter, and when the battery internal resistance detection load circuit is turned on to measure the battery, the central processing unit will measure the battery. The second battery voltage is obtained through the analog-to-digital converter. According to the first battery voltage and the second battery voltage, the battery internal resistance value of the battery internal resistance in the battery can be calculated. Among them, the voltage drop voltage of the battery can be calculated according to the first battery voltage, the battery internal resistance value, and the power consumption current of the power consuming element. When the first battery voltage minus the voltage drop voltage is lower than the predetermined cut-off voltage, the user of the portable electronic device is warned and the power of the portable electronic device is turned off. In the embodiment of the present invention, the battery internal resistance detection load circuit includes a resistor and a transistor. The resistor has a first terminal and a second terminal, and the first terminal of the resistor is coupled to one terminal of the battery. The transistor has a first source / drain, a gate, and a second source / drain. The first source / drain of the transistor is coupled to the second end of the resistor, and the gate of the transistor is coupled. To the central processing unit, and the second source / drain of the transistor is coupled to the other end of the battery. In a preferred embodiment of the present invention, the predetermined cut-off voltage can be adjusted. In a preferred embodiment of the present invention, when the first battery voltage minus the voltage drop voltage is higher than a predetermined cut-off voltage, the portable electronic device will operate normally without issuing a "warning of insufficient battery voltage".
11242twf.ptd 第7頁 1223487 五、發明說明（4) 在本發明的實施例中，此可攜式電子裝置可例如是數 位相機、數位攝影機、或者是個人數位助理器，帶是熟習 此項技藝者當知，並不以此為限。 本發明還提出一種電源控制裝置之運作方法。此運 作方法係適用於以電池作為電源的可攜式電子裝置。此可 攜式電子裝置係具有例如是閃光燈充電電路、液晶顯示器 背光驅動電路、鏡頭馬達驅動電路、或揚聲器放大電路的 耗電元件，但是熟習者此技藝當知，並不以此為限。此電 源控制裝置包括電池内阻檢測負載電路。在此運作方法 中，首先會關閉電池内阻檢測負載電路，並量測電池而得 到第一電池電壓。接著，會開啟電池内阻檢測負載電路， 並量測電池而得到第二電池電壓。接下來，會依據第一電 $電壓及第二電池電壓，而計算求得電池中的電池内阻之 電池内阻值。之後，會依據第一電池電壓、電池内阻值、 以及耗電元件的耗電電流，而計算求得電池的壓降電壓。 最後，當第一電池電壓減去壓降電壓係低於預定截止電壓 時，會警示可攜式電子裝置的使用者，並且關閉可攜式電 子裝置的電源。 綜上所述，本發明是藉由電源控制裝置中的電池内阻 檢測負載電路，而得知可攜式電子裝置中的電池之電池内 阻值。藉此，可計算出可攜式電子裝置中的耗電元件在運 ’作時，在電池的正負極二端所造成的壓降，而能準確地偵 測出電池的電力存量。 為讓本發明之上述和其他目的、特徵和優點，能更加11242twf.ptd Page 7 1223487 V. Description of the invention (4) In the embodiment of the present invention, the portable electronic device may be, for example, a digital camera, a digital video camera, or a personal digital assistant, and is familiar with the art Those who know it do not limit it. The invention also provides a method for operating the power control device. This method of operation is suitable for portable electronic devices that use batteries as a power source. The portable electronic device has a power consumption element such as a flash charging circuit, a liquid crystal display backlight driving circuit, a lens motor driving circuit, or a speaker amplifier circuit, but the skilled person knows this technology and is not limited thereto. The power control device includes a battery internal resistance detection load circuit. In this operation method, the battery internal resistance detection load circuit is closed first, and the battery is measured to obtain the first battery voltage. Then, the battery internal resistance detection load circuit is turned on, and the battery is measured to obtain a second battery voltage. Next, the battery internal resistance value of the battery internal resistance in the battery is calculated based on the first voltage and the second battery voltage. After that, the voltage drop of the battery is calculated and calculated according to the first battery voltage, the battery internal resistance value, and the power consumption current of the power consuming element. Finally, when the voltage of the first battery minus the voltage drop voltage is lower than the predetermined cut-off voltage, the user of the portable electronic device is warned and the power of the portable electronic device is turned off. In summary, in the present invention, the internal resistance of the battery in the portable electronic device is obtained by detecting the load circuit through the internal resistance of the battery in the power control device. With this, it is possible to calculate the voltage drop caused by the power consuming components in the portable electronic device at the positive and negative terminals of the battery, and to accurately detect the battery's power reserve. In order to make the above and other objects, features and advantages of the present invention,
11242twf.ptd 第8頁 1223487 五、發明說明（5) 明顯易懂，下文特舉較佳實施例，並配合所附圖示，做詳 細說明如下： 實施方式： 請參照第2圖，其繪示的是根據本發明一較佳實施例 之電源控制裝置的電路概圖。此電源控制裝置係適用於以 電池為電源的可攜式電子裝置（例如是數位相機、數位攝 影機（DSC)、或者是個人數位助理器（PDA))。一般而言， 可攜式電子裝置會具有耗電元件，如數位攝影機中的閃光 燈驅動電路、液晶顯示器（L C D )背光驅動電路、以及鏡頭 馬達驅動電路；或者是個人數位助理器中的液晶顯示器背 光驅動電路及揚聲器放大電路，但是熟習者此技藝當知，< 並不以此為限。由第2圖可知，電源控制裝置2 0包括電池 内阻檢測負載電路2 0 2、類比至數位轉換器2 0 4、以及中央 處理單元2 0 6。接下來將說明電源控制裝置2 0之各部分的 功能。 電池内阻檢測負載電路2 0 2係用以檢測電池的電池内 阻。在此較佳實施例中，電池内阻檢測負載電路2 0 2包括 電阻RD 2 0 8及電晶體QD 210。其中，電阻RD 2 0 8的一端係耦 接至電池2 1 2的一端，而電阻RD 2 0 8的另一端係耦接至電晶 體QD 2 1 0的第一源/汲極。電晶體QD 2 1 0的閘極係耦接至中 央處理單元2 0 6 ，而電晶體QD 210的第二源/汲極係耦接至 •電池2 1 2的另一端。 類比至數位轉換器2 0 4係用以將電池2 1 2的類比電壓做 類比至數位轉換，而輸出數位電壓至中央處理單元206。11242twf.ptd Page 8 1223487 V. Description of the invention (5) Obviously easy to understand. The following is a detailed description of the preferred embodiment and the accompanying drawings, as follows: Implementation: Please refer to Figure 2, which shows It is a schematic circuit diagram of a power control device according to a preferred embodiment of the present invention. The power control device is suitable for a battery-powered portable electronic device (such as a digital camera, a digital video camera (DSC), or a personal digital assistant (PDA)). Generally speaking, portable electronic devices have power-consuming components, such as a flash drive circuit in a digital camera, a liquid crystal display (LCD) backlight drive circuit, and a lens motor drive circuit; or a liquid crystal display backlight in a personal digital assistant. Drive circuit and speaker amplifier circuit, but those skilled in the art should know that < is not limited to this. It can be seen from FIG. 2 that the power control device 20 includes a battery internal resistance detection load circuit 2 2, an analog-to-digital converter 2 0 4, and a central processing unit 2 0 6. The function of each part of the power control device 20 will be described next. Battery internal resistance detection load circuit 2 0 2 is used to detect the internal resistance of the battery. In this preferred embodiment, the battery internal resistance detection load circuit 202 includes a resistor RD208 and a transistor QD210. One end of the resistor RD 208 is coupled to one end of the battery 2 12, and the other end of the resistor RD 208 is coupled to the first source / drain of the transistor QD 2 1 0. The gate of the transistor QD 2 1 0 is coupled to the central processing unit 2 06, and the second source / drain of the transistor QD 210 is coupled to the other end of the battery 2 1 2. The analog-to-digital converter 204 is used to perform analog-to-digital conversion on the analog voltage of the battery 2 12 and output the digital voltage to the central processing unit 206.
11242twf.ptd 第9頁 1223487 五、發明說明（6) 而中央處理單元2 0 6係用以控制電池内阻檢測負載電 路2 0 2的關閉與開啟。在計算電池2 1 2之電池内阻2 1 4的電 池内阻值R s時，首先中央處理單元2 0 6會關閉電晶體2 1 0且 開關2 1 6會開路（亦即，未加上耗電元件2 1 8 )，接著會量測 電池2 1 2，然後中央處理單元2 0 6會經由類比至數位轉換器 204而取得電池電壓VDGFF。接下來，中央處理單元2 0 6會開 啟電晶體2 1 0且開關2 1 6仍為開路，接著會量測電池2 1 2 ， 然後中央處理單元2 0 6會經由類比至數位轉換器2 0 4而取得 電池電壓VDGN。此時，流經電池内阻檢測負載電路202的電 流為ID，電晶體2 1 0導通時的跨壓為V t ，而電池電壓VDGFF與 電池電壓V_之間的關係係如底下的式（1 )所示： < VD0FF - VD0N = IDxRs=[( VD0N - Vt)/ RD] x Rs ---(1) 之後，藉由式（1 )可計算求得Rs =[(VD°FF-V_)/(V_-V t) ] x RD。然後，當開關2 1 6短路時，可依據所計算求得之 電池内阻2 1 4的電池内阻值Rs，而求得耗電元件2 1 8耗電 時，在電池2 1 2的正負極二端所造成的壓降電壓VdrQP。在此 係假設的耗電電流為IL，IL通常可從耗電元件2 1 8的規格書 中得知。接著，可求得Vdr。p = V’F -( IL X Rs)二 VD0FF -{ IL X [(vD0FF - VD0N) / ( VD0N - Vt)]} o 之後，當電池電壓VDC)FF減去壓降電壓亦即，耗電 元件2 1 8耗電時，電池2 1 2所出現的電壓）低於預定截止電 •壓Vth時，會警示可攜式電子裝置的使用者，並且關閉可攜 式電子裝置的電源。當電池電壓VDGFF減去壓降電壓Vdr°p高於 預定截止電壓Vth時，則可攜式電子裝置會繼續正常運作，11242twf.ptd Page 9 1223487 V. Description of the invention (6) The central processing unit 206 is used to control the internal resistance of the battery to detect the load circuit 202 being turned on and off. When calculating the battery internal resistance value R s of the battery internal resistance 2 1 4 of the battery 2 1 2, first the central processing unit 2 0 6 will turn off the transistor 2 1 0 and the switch 2 1 6 will be open (ie, without adding The power consuming element 2 1 8), then the battery 2 1 2 is measured, and then the central processing unit 2 06 obtains the battery voltage VDGFF through the analog-to-digital converter 204. Next, the central processing unit 2 06 will turn on the transistor 2 1 0 and the switch 2 1 6 is still open. Then the battery 2 1 2 will be measured, and then the central processing unit 2 6 will pass the analog to digital converter 2 0 4 to obtain the battery voltage VDGN. At this time, the current flowing through the battery internal resistance detection load circuit 202 is ID, the voltage across the transistor 2 10 when it is turned on is V t, and the relationship between the battery voltage VDGFF and the battery voltage V_ is as follows ( 1) As shown below: < VD0FF-VD0N = IDxRs = [(VD0N-Vt) / RD] x Rs --- (1), then Rs = [(VD ° FF- V _) / (V_-V t)] x RD. Then, when the switch 2 1 6 is short-circuited, the battery internal resistance value Rs of the battery internal resistance 2 1 4 obtained according to the calculation can be obtained, and when the power consumption element 2 1 8 consumes power, the positive value of the battery 2 1 2 The voltage drop VdrQP caused by the negative terminal. It is assumed here that the power consumption current is IL, and IL can usually be obtained from the specifications of the power consumption element 2 1 8. Then, Vdr can be obtained. p = V'F-(IL X Rs) two VD0FF-{IL X [(vD0FF-VD0N) / (VD0N-Vt)]} o After that, when the battery voltage VDC) FF minus the voltage drop voltage, that is, power consumption When the component 2 1 8 consumes power, the voltage appearing on the battery 2 1 2) is lower than the predetermined cut-off voltage Vth, which warns the user of the portable electronic device and turns off the power of the portable electronic device. When the battery voltage VDGFF minus the voltage drop voltage Vdr ° p is higher than the predetermined cut-off voltage Vth, the portable electronic device will continue to operate normally,
11242twf.ptd 第10頁 1223487 五、發明說明（7) 而不會發出「電池電壓不足的警示」。其中，預定截止電 壓Vth可視需要而予以調整。接下來請參照第3圖，其繪示 的是根據本發明一較佳實施例之電源控制裝置，在可攜式 電子裝置上所顯示的電池之電力存量的示意圖。由第3圖 可知，當VDQFF - VdrQp <= Vth時，係表示電池212已經沒電； 當¥^〇。。” — ^叫<=(^«+0.2伏特）時，係表示電池212快 要沒電；而當VDGFF - VdrQp > (VTHO. 2伏特）時，係表示電池 2 1 2的電力充足。 另外，要說明的是，電池2 1 2的電壓通常需要經由分 壓電路2 2 0做分壓，然後經由類比至數位轉換器2 0 4而供應 至中央處理單元206。再者，也需要電壓調整器222及電壓I 調整器2 2 4，以使中央處理單元2 0 6及耗電元件2 1 8能得到 所需要的電壓。 ^ 為了更清楚起見，接下來將說明本發明之電源控制 裝置之運作方法。請參照第4圖，其繪示的是根據本發明 一較佳實施例之電源控制裝置之運作方法的流程圖。底下 將配合第2圖來做說明。 在此運作方法中，首先，中央處理單元2 0 6會關閉電 池内阻檢測負載電路2 0 2 (亦即，關閉電晶體2 1 0 )(如步驟 S4 0 2 )，並量測電池212 ，然後中央處理單元2 0 6會經由類 比至數位轉換器2 0 4而取得電池電MV_F(如步驟S4 0 4 )。 接著，中央處理單元2 0 6會開啟電池内阻檢測負載電^ 路2 0 2 (亦即，開啟電晶體210)(如步驟S4 0 6 )，並量測電池 2 1 2 ，然後中央處理單元2 0 6會經由類比至數位轉換器2 0 411242twf.ptd Page 10 1223487 V. Description of the invention (7) It will not issue the “warning of low battery voltage”. Among them, the predetermined cut-off voltage Vth can be adjusted as needed. Next, please refer to FIG. 3, which shows a schematic diagram of the power reserve of a battery displayed on a portable electronic device of a power control device according to a preferred embodiment of the present invention. It can be seen from FIG. 3 that when VDQFF-VdrQp < = Vth, it means that the battery 212 has run out; when ¥ ^ 〇. . ”— When ^ is called < = (^« + 0.2 Volts), it means that the battery 212 is about to run out of power; when VDGFF-VdrQp > (VTHO. 2 Volts), it means that the battery 2 1 2 has sufficient power. It should be noted that the voltage of the battery 2 1 2 usually needs to be divided by the voltage dividing circuit 2 2 0 and then supplied to the central processing unit 206 through the analog-to-digital converter 2 0 4. Furthermore, the voltage is also required The regulator 222 and the voltage I regulator 2 2 4 so that the central processing unit 206 and the power consumption element 2 1 8 can obtain the required voltage. ^ For the sake of clarity, the power control of the present invention will be described below. The operation method of the device. Please refer to FIG. 4, which shows a flowchart of the operation method of the power control device according to a preferred embodiment of the present invention. The following description will be made in conjunction with FIG. 2. In this operation method First, the central processing unit 206 will close the battery internal resistance detection load circuit 2 0 2 (that is, the transistor 2 1 0 is closed) (as in step S4 0 2), and measure the battery 212, and then the central processing unit 2 0 6 will get the battery voltage MV_F via the analog to digital converter 2 0 4 ( (Step S4 0 4). Then, the central processing unit 2 06 will turn on the battery internal resistance to detect the load circuit 2 0 2 (ie, turn on the transistor 210) (eg, step S4 0 6), and measure the battery 2 1 2, then the central processing unit 2 0 6 will pass the analog to digital converter 2 0 4
11242twf.ptd 第11頁 1223487 五、發明說明（8) 而取得電池電壓¥_(如步驟S4 0 8 )。 接下來，會藉由式（1 )而計算求得電池2 1 2中的電池 内阻214 之電池内阻值Rs =[( VD0FF - VD0N)/ ( VD0N - Vt)] x RD(如步驟S41 0)。 接下來，藉由取欲動作的耗電元件2 1 8之耗電電流 I L，而計算求得耗電元件2 1 8在電池2 1 2的二端所造成的壓 降電壓Vdrop = VD_ -(ILxRs)= V_F -{ILx[( VD°FF - V_)/ (V_ - Vt) ] }(如步驟S412)。 之後，會判斷電池電壓VD_減去壓降電壓Vdl*Qp(亦即， 耗電元件2 1 8耗電時，電池2 1 2所出現的電壓）是否低於預 定截止電壓Vth (如步驟S414)。 < 如果電池電壓VDGFF減去壓降電壓低於預定截止電 壓Vth ，則會警示可攜式電子裝置的使用者，並且關閉可攜 式電子裝置的電源（如步驟S416)。 而如果電池電壓VDGFF減去壓降電壓VdI^高於預定截止 電壓Vth ，則可攜式電子裝置會繼續正常運作，而不會發 出「電池電壓不足的警示」（如步驟S41 8)。 綜上所述，本發明是藉由電源控制裝置中的電池内 阻檢測負載電路，而得知可攜式電子裝置中的電池之電池 内阻值。藉此，可計算出可攜式電子裝置中的耗電元件在 運作時，在電池的正負極二端所造成的壓降，而能準確地 偵測出電池的電力存量。 雖然本發明已以較佳實施例揭露於上，然其並非用 以限定本發明，任何熟習此技藝者，在不脫離本發明之精11242twf.ptd Page 11 1223487 V. Description of the invention (8) The battery voltage ¥ _ is obtained (as in step S4 0 8). Next, the battery internal resistance Rs = [(VD0FF-VD0N) / (VD0N-Vt)] x RD in the battery internal resistance 214 of the battery 2 1 2 will be calculated by using formula (1) (as in step S41). 0). Next, the voltage drop voltage Vdrop = VD_-(caused by the power consuming element 2 1 8 at the two terminals of the battery 2 1 2 is calculated by taking the power consumption current IL of the power consuming element 2 1 8 to be operated. ILxRs) = V_F-{ILx [(VD ° FF-V _) / (V_-Vt)]} (as in step S412). After that, it is determined whether the battery voltage VD_ minus the voltage drop voltage Vdl * Qp (that is, the voltage appearing in the battery 2 1 2 when the power consumption element 2 1 8 consumes power) is lower than a predetermined cut-off voltage Vth (as in step S414 ). < If the battery voltage VDGFF minus the voltage drop voltage is lower than the predetermined cut-off voltage Vth, the user of the portable electronic device will be warned and the power of the portable electronic device will be turned off (step S416). If the battery voltage VDGFF minus the voltage drop voltage VdI ^ is higher than the predetermined cut-off voltage Vth, the portable electronic device will continue to operate normally without issuing a "battery voltage warning" (eg, step S41 8). In summary, the present invention knows the battery internal resistance value of the battery in the portable electronic device by detecting the load circuit in the power control device. In this way, the voltage drop caused by the power-consuming components in the portable electronic device at the positive and negative terminals of the battery during operation can be calculated, and the power reserve of the battery can be accurately detected. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art will not depart from the essence of the present invention.
11242twf.ptd 第12頁 122348711242twf.ptd Page 12 1223487
11242twf.ptd 第13頁 1223487 圖式簡單說明 第1圖繪示的是鹼性電池及鎳氫電池的放電曲線圖； 第2圖繪示的是根據本發明一較佳實施例之電源控制 裝置的電路概圖； 第3圖繪示的是根據本發明一較佳實施例之電源控制 裝置，在可攜式電子裝置上所顯示的電池之電力存量的示 意圖；以及 第4圖繪示的是根據本發明一較佳實施例之電源控制 裝置之運作方法的流程圖。 圖式標示說明： 2 0 :電源控制裝置 2 0 2 :電池内阻檢測負載電路 2 0 4 :類比至數位轉換器 206 :中央處理單元 208 :電阻 2 1 0 :電晶體 2 1 2 ··電池 2 1 4 :電池内阻 2 1 6 :開關 2 1 8 :耗電元件 2 2 0 :分壓電路 222 ，224 :電壓調整器 • S 4 0 2 - S 4 1 8 :本發明一較佳實施例的施行步驟11242twf.ptd Page 13 1223487 Brief description of the diagrams Figure 1 shows the discharge curves of alkaline and nickel-metal hydride batteries; Figure 2 shows the power control device according to a preferred embodiment of the present invention. A schematic circuit diagram; FIG. 3 shows a schematic diagram of the power reserve of a battery displayed on a portable electronic device of a power control device according to a preferred embodiment of the present invention; and FIG. 4 shows a diagram based on A flowchart of a method for operating a power control device according to a preferred embodiment of the present invention. Description of the graphical symbols: 2 0: power control device 2 0 2: battery internal resistance detection load circuit 2 0 4: analog to digital converter 206: central processing unit 208: resistor 2 1 0: transistor 2 1 2 ·· battery 2 1 4: Battery internal resistance 2 1 6: Switch 2 1 8: Power consuming element 2 2 0: Voltage dividing circuit 222, 224: Voltage regulator • S 4 0 2-S 4 1 8: One of the best of the present invention Implementation steps of the embodiment
11242twf.ptd 第14頁11242twf.ptd Page 14
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7602156B2 (en) | 2005-11-01 | 2009-10-13 | Asustek Computer Inc. | Boost converter |
| TWI398028B (en) * | 2007-07-20 | 2013-06-01 | Hon Hai Prec Ind Co Ltd | Apparatus and method for measuring internal resistance of battery |
| TWI664434B (en) * | 2014-06-05 | 2019-07-01 | 美國密西根州立大學 | Electronic device with supervisor circuit for detecting resistance parameter of an energy storage device |
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2003
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7602156B2 (en) | 2005-11-01 | 2009-10-13 | Asustek Computer Inc. | Boost converter |
| TWI398028B (en) * | 2007-07-20 | 2013-06-01 | Hon Hai Prec Ind Co Ltd | Apparatus and method for measuring internal resistance of battery |
| TWI664434B (en) * | 2014-06-05 | 2019-07-01 | 美國密西根州立大學 | Electronic device with supervisor circuit for detecting resistance parameter of an energy storage device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200427173A (en) | 2004-12-01 |
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