201109903 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種電源供應電路，特別係指一種能使得筆 記型電腦更換電池時不斷電工作的電源供應電路。 [先前技術] [0002] 各類電子產品’例如筆記型電腦（Not ebook Computer )在使用時均需要直流電做為電子產品的電源。通常的 筆記型電腦設計中對電源供應分為兩部分，一是電源適 配器，二是筆記本電池。電源適配器的主要作用是在有 110V-220V交流電提攀的固定場所為筆記型電腦提供電 源和為筆記本電池充電，但是其只能在提供交流電的固 定場所使用。為避免上述用電的局限，造成使用範圍、 電線的牵絆而影響使用的方便性’常用的辦法就是採用 電池供電的方式。 [0003] 近年來’以筆記型電腦為例’由於電腦技術的突飛猛進 '： . . .... ； ： ’也使得中央處理單元（CPU)與視頻圖形陣列（Video Graphics Array，VGA)的故能得以不斷提升，隨著功 能的不斷完善，也促使人們對其周邊元件越來越重視。 隨著對電池材料的改進’其使用壽命延長’使用電池更 加成為許多經常外出的人士所喜愛的一種供電方式。在 傳統的筆記本設計中’通常只採用一個主電池給系統供 電’當未接電源適配器且主電池電量極低的時候，使用 者可根據系統的提示而拔出該主電池更換另一塊備用的 電池。然而，使用者更換該主電池只有在關機後才能進 行，且電池更換後需要重新開機’因而給使用者帶來不 098129616 表單編號A0101 第4頁/共19頁 0982050810-0 201109903 [0004] [0005] Ο ❹ [0006] 便；另外，有一些使用者會帶電誤拔下筆記型電腦的主 電池，有可能損壞用戶正在操作的資料，造成用戶重要 的資訊和資料丟失。 【發明内容】 有鑒於此，有必要提供一種能使得筆記型電腦更換電池 時不斷電工作的電源供應電路。 一種筆記型電腦電源供應電路，包括一主電池及一備用 電池，所述主電池及備用電池各具有第一、第二輸出端 子，該主電池的第一輸出端子的長度小於第二輪出端子 的長度，該主電池的第一輸出端子與第二輸出端子上連 接有第一控制電路，該備用電池的第一、第二輸出端子 與主電池的第一輸出端子上連接有第二控制電路，主·電 池通過第一控制電路向筆記型電腦供電，備用電池通過 第二控制電路與筆記型電腦斷開，當將主電池與筆記型 電腦斷開連接時，主電池的第一輸出端子相對第二輸出 端子更早與筆記型電腦之間斷開連接並形成一短暫的時 間差，在該時間差内，主電池通過第一控制電路與筆記 型電腦斷開，而備用電池通過第二控制電路向筆記型電 腦供電，從而在瞬間内完成由主電池向筆記型電腦供電 切換成由備用電池向筆記型電腦供電的轉換。 與習知技術相比，該筆記型電腦電源供應電路包括連接 於該主電池的第一輸出端子與第二輸出端子之間的第一 控制電路及備用電池的第一、第二輸出端子與主電池的 第一輸出端子之間的第二控制電路，且由於主電池的第 一輸出端子的長度小於第二輸出端子的長度，當將主電 098129616 表單編號Α0101 第5頁/共19頁 0982050810-0 201109903 池拔出時，主電池的第一輸出端子相對第二輸出端子較 早與筆記型電腦斷開而形成一短暫的時間差，於該時間 差内，第一、第二控制電路切換控制狀態，而完成由主 電池向筆記型電腦供電到備用電池向筆記型電腦供電的 切換，該切換過程不需要關閉主機即可完成，使用方便 【實施方式】 [0007] 以下參照附圖，對本發明筆記型電腦電源供應電路予以 進一步說明。 · ❹ [0008] 請參閱圖1，本發明實施例中筆記型電腦電源供應電路用 於對一筆記型電腦的耗電系統10，如主板供電，包括一 交流電源20、一充電電路30、一嵌入式控制器40、一主 電池50、一第一控制電路60、一備用電池70及一第二控 制電路80。 [0009] 請參閱圖2及圖3，所述主電池50及備用電池70分別包括 複數電連接端子。本實施例中，主電池50及備用電池70 分別包括七個電連接端子。其中，第一和第二端子均與 地極連接。第四和第五端子為讀取資訊端，其可用於筆 記型電腦通過嵌入式控制器40讀取電池的容量、類型、 剩餘電量等相關資訊。第三端子為備用端，其用於擴展 功能時使用。第六、第七端子51(71) 、52 ( 72 )為輸 出端，其用於向筆記型電腦的主板10輸出電源。所述主 電池50和備用電池70還分別包括兩個固定端子，即第八 和第九端子，其主要用於將主電池50及備用電池70分別 連接於筆記型電腦内的相應位置。本實施例中，主電池 098129616 表單編號A0101 第6頁/共19頁 0982050810-0 201109903 5〇可拆卸地插設於主板10上的第一電池槽（圖未示）内 ’而備用電池70固定地裝設於主板10上的第二電池槽（ 圖未示）内。所述第一、第二電池槽内分別包括複數端 子，以分別與主電池50及備用電池70上的端子相對應。 Ο [0010] 當所述主電池50及備用電池70分別安裝於筆記型電腦的 第一、第二電池槽内時’其七個電連接端子分別與該第 一、第二電池槽内的端子相互接觸而電性連接，其兩個 固定端子的外表面設有銅箔，固定端子將電池、7〇分 別固定於對應電池槽内的同時與地極連接。其中，該主 電池50的第七端子52比第六端子51稍短，備用電池7〇的 第六、第七蜂子71、72連接形成一第一結點73。 ❹ 第一控制電路60包括與主電池50的第六端子5丨電連接的 第一、第二場效應管、Q2、與主電池5〇的第七端子52 電連接的第三場效應管Q3、一第一電阻ri及一第二電阻 R2。該第一、第二場效應管Ql、Q2均為P溝道增強型M0S 場效應管。該第一場效應管Q1的汲極通過一電感Li與主 電池50的第六端子51電連接。_第一場效應管qi的源極與 第二場效應管Q2的源極電連接。第二場效應管Q2的没極 作為主電池50通過該第一控制電路60向主板10供電的電 源輸出端61。該第三場效應管Q3為N溝道增強型MOS場效 應管。第三場效應管Q3的閘極與主電池50的第七端子52 電連接。第一電阻R1的一端與第三場效應管Q3的閘極電 連接，另一端與地極連接。該第三場效應管Q3的源極與 地極連接。第三場效應管Q3的沒極與第一場效應管Q1的 閘極電連接’於該第三場效應管Q3的没極與第一場效應 098129616 表單編號A0101 第7頁/共19頁 0982050810-0 201109903 極之間形成-第二結，該第二電_一 遠板1。上的一電幽電連接，另一端與第二結賴 接。該觸«可以為備用電池7G的輸出經過降愿處 較大小的電源。第二場效應管Q2的閘極與充電 電路30電連接，當筆記型電腦通過—電源適配器（圖未 不）與交流電㈣連接時，嵌人式控制㈣可通過讀取 主電池5_的_電量等資絲控難充電電路30是否 對主電池50充電。 [0011] 第-控_電路8G包括與第―結點7錄連接的第四、第五 場效應_、Q5、與·池5〇的第七端子52f連接的第 六、第七場效應管Q6、Q7、-第三電阻R3和一第四電阻 R4。所述第四·、第五場效應管Q4、Q5均為p溝道增強型 M0S場效應管。該第四場效應管q4的汲極通過一電感[2與 第一結點73電連接。該第四場效應管〇4的源極與第五場 效應管Q5的源極電連接。第五場效應管卯的汲極作為備 用電池70通過該第二控制電路80向主板1〇供電的電源輸 出端81 ^該第五場效應管Q5的閘極與充電電路3〇電連接 ’當該筆記型電腦通過電源適配器與交流電源2 〇連接時 ’嵌入式控制器40可通過讀取備用電池7〇内的剩餘電量 等資訊而控制該充電電路30是否對備用電池7〇充電。所 述第六、第七場效應管Q6、Q7為N溝道增強型MOS場效應 管。第六場效應管Q6的閘極與主電池50的第七端子52電 連接。第六場效應管Q6的源極與地極連接。第六場效應 管Q6的汲極與第七場效應管Q7的閘極電連接，並於第六 場效應管Q6的汲極與第七場效應管Q7的閘極之間形成第 098129616 表單編號Α0101 第8頁/共19頁 0982050810-0 201109903 三結點82。第三電阻R3的一端與電源VDD電連接，另一端 與第三結點82電連接。該第七場效應管Q7的源極與地極 連接，汲極與第四場效應管Q4的閘極電連接。該第七場 效應管Q7的汲極與第四場效應管Q4的閘極之間形成第四 結點83。第四電阻R4的一端電源VDD電連接，另一端與第 四結點83電連接。 [0012] ❹ 〇 [0013] 當所述主電池50與備用電池70對應地安裝於筆記型電腦 内的第一、第二電池槽内時，該主電池50的第七端子52 處形成高電位，從而使得第一控制電路60中第三場效應 管Q3的閘極為高電位，柵-源電壓大於第三場效應管Q3的 開啟電壓。故，該第三場效應管Q3開啟。同時，電源VDD 通過第二電阻R2、第三場效應管Q3的汲極與源極與地極 之間形成回路，從而使得第一場效應管Q1的閘極相對汲 極為低電位，第一場效應管Q1開啟。由於第一、第二場 效應管Ql、Q2共源極，此時，主電池50可通過第六端子 51、第一、第二場效應管Ql、Q2與電源輸出端61之間形 成通路，主電池50可向筆記型電腦供電。 同時，由於該主電池50的第七端子52處形成高電位，使 得該第二控制電路80中的第六場效應管Q6的閘極也形成 為高電位，柵-源電壓大於第六場效應管Q6的開啟電壓， 故，該第六場效應管Q6開啟。同時，電源VDD通過第三電 阻R3、第六場效應管〇6的汲極與源極與地極之間形成回 路，從而使得該第七場效應管Q7的閘極為低電位，第七 場效應管Q7的柵-源電壓小於開啟電壓，因而第七場效應 管Q7截止。此時，連接於第四結點83的電源VDD與第四電 098129616 表單編號A0101 第9頁/共19頁 0982050810-0 201109903 阻R4使彳于第四場效應管Q4的閘極相對汲極為高電位第 四場效應管Q4截止。此時，備用電池7〇的第六、第七端 子71 ' 72由於第四場效應管Q4的截止而與電源輸出端“ 之間為開路，備用電池70不能向筆記型電腦供電。 [0014] 當主電池50的電量不足時，系統將發出警示資訊告知使 用者，此時使用者可將主電池5〇直接從筆記型電腦的第 一電池槽内拔出。當使用者將主電池5〇從筆記型電腦的 第一電池槽内拔出時，由於主電池5〇的第七端子52比第 六端子51短，該第七端子52相對第六端子51較早與筆記 型電腦之間斷開連接’形成—短暫的時間差。於該時間 差内，主電池50的第七端子52從高電位轉換成低電位， 而第六端子51仍與電池槽内的對廖端子維持電連接而保 持高電位。由於主電池50的第七端子52為低電位，使得 第一控制電路60中第三場效應管Q3的栅-源電壓小於第三 場效應管Q3的開啟電壓，第三場效應管q3截止。其中， 連接於第三場效應管Q3的閘極與地極之間的第一電阻以 ，晶 # ；.-φ...二..:： 可保證第三場效應管Q3及時截止。由於第三場效應管Q3 截止，連接於第二結點62的電源VDD及第二電阻R2使得第 一場效應管Q1的閘極相對汲極為高電位，因而第一場效 應管Q1截止。該第一場效應管Q1的截止使得主電池5〇的 第六端子51與電源輸出端61之間為開路，主電池50不再 向筆記型電腦供電。 於該時間差内’由於主電池50的第七端子52為低電位， 使得第二控制電路80中第六場效應管Q6小於第六場效應 管Q6的開啟電壓，因而第六場效應管Q6截止。同時，連 098129616 表單編號A0101 第10頁/共19頁 0982050810-0 [0015] 201109903 Ο [0016] [0017] 〇 接於第三結點82的VDD電源及第三電阻R3使得第七場效應 管Q7的柵-源電壓大於第七場效應管Q7的開啟電壓，因而 第七場效應管Q7開啟。由於第七場效應管Q7開啟，電源 VDD通過第四電阻R4、第七場效應管〇7的汲極、源極與地 極之間形成回路，從而使得第四場效應管Q4的閘極相對 汲極為低電位，第四場效應管Q4開啟。由於第四、第五 場效應管Q4、Q5共源極，此時，備用電池70可通過第六 、第七端子71、72、第四、第五場效應管Q4、Q5與電源 輸出端81之間形成通路，備用電池70向筆記型電腦供電 ，從而及時完成由主電池50向筆記型電腦供電切換成由 備用電池70向筆記型電腦供電的轉換。 t| 1 liiil 'll 可以理解的，如果使用者另外備有可更換的主電池，可 以在備用電池70電量不足的情況下，直接將該可更換的 主電池直接插入第二電池槽内即可。 終上所述，本發明筆記型電腦電源供用電路可使得筆記 型電腦在主電池50電量不足的情況下，不需要關機，而 直接通過拔除主電池50的瞬間完成由主電池50向筆記型 電腦供電切換到由備用電池70向筆記型電腦供電的轉換 。故，該筆記型電腦電源供應電路可在主電池50電量極 低而更換備用電池70的時候使筆記型電腦不間斷工作， 避免使用者需要關機才能更換電池的問題，或帶電誤拔 電池造成用戶重要資訊和資料的丟失，具有使用方便的 優點。 綜上所述，本發明符合發明專利之要件，爰依法提出專 利申請。惟以上所述者僅為本發明之較佳實施例，舉凡 098129616 表單編號A0101 第11頁/共19頁 0982050810-0 [0018] 201109903 熟悉本案技藝之人士，在爰依本發明精神所作之等效修 飾或變化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 [0019] [0020] [0021] 圖1是本發明實施例中筆記型電腦電源供應電路的功能方 塊圖。 圖2是本發明實施例中主電池通過第一控制電路對筆記型 電腦供電的電路示意圖。 圖3是本發明實施例中備用電池通過第二控制電路對筆記 型電腦供電的電路示意圖。 【主要元件符號說明】 [0022] 耗電系統 10 交流·電源 20 充電電路 30 嵌入式控制器 40 主電池 50 第六端子 51 第七端子 52 第一控制電路 60 電源輸出端 61 第二結點 62 備用電池 70 第六端子 71 第七端子 72 第一結點 73 第二控制電路 80 電源輸出端 81 第三結點 82 第四結點 83 場效應管 Ql 、 Q2 、 Q3 、Q4 、 Q5 、 Q6、Q7 電感 LI、L2 電阻 Rl ' R2 、 R3 、R4 表單編號A0101 第12頁/共19頁 0982050810-0 098129616 201109903 --201109903 VI. Description of the Invention: [Technical Field] The present invention relates to a power supply circuit, and more particularly to a power supply circuit capable of continuously operating a pen type computer when replacing a battery. [Prior Art] [0002] Various electronic products such as a notebook computer (Not ebook Computer) require DC power as a power source for electronic products. In the typical notebook design, the power supply is divided into two parts, one is the power adapter, and the other is the laptop battery. The main function of the power adapter is to supply power to the notebook and to charge the laptop battery in a fixed location with 110V-220V AC climbing, but it can only be used in a fixed location where AC power is supplied. In order to avoid the above-mentioned limitations of power consumption, the use range and the tie of the wires affect the convenience of use. A common method is to use a battery-powered method. [0003] In recent years, 'taking a notebook computer as an example' due to the rapid advancement of computer technology ': . . . ; : ' Also makes the central processing unit (CPU) and video graphics array (Video Graphics Array, VGA) It can be continuously improved, and with the continuous improvement of functions, it also prompts people to pay more and more attention to its peripheral components. With the improvement in battery materials, the use of batteries has become a favorite mode of supply for many people who are often out. In the traditional notebook design, 'usually only one main battery is used to power the system'. When the power adapter is not connected and the main battery is extremely low, the user can pull out the main battery and replace another spare battery according to the prompt of the system. . However, the user can replace the main battery only after the power is turned off, and the battery needs to be restarted after the replacement. Therefore, the user is not brought 098129616. Form No. A0101 Page 4 / 19 pages 0982050810-0 201109903 [0004] [0005 ] Ο ❹ [0006]; In addition, some users will accidentally pull out the main battery of the notebook, which may damage the data that the user is operating, resulting in the loss of important information and data of the user. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a power supply circuit that enables a notebook computer to continuously operate while replacing a battery. A notebook computer power supply circuit includes a main battery and a backup battery, each of the main battery and the backup battery has first and second output terminals, and a length of the first output terminal of the main battery is smaller than a second round output terminal a first control circuit is connected to the first output terminal and the second output terminal of the main battery, and the second control circuit is connected to the first output terminal of the backup battery and the first output terminal of the main battery The main battery supplies power to the notebook computer through the first control circuit, and the backup battery is disconnected from the notebook computer through the second control circuit. When the main battery is disconnected from the notebook computer, the first output terminal of the main battery is opposite. The second output terminal is disconnected from the notebook earlier and forms a short time difference, during which the main battery is disconnected from the notebook through the first control circuit, and the backup battery passes the second control circuit to the note. The computer is powered, so that the power from the main battery to the notebook is switched to power from the backup battery to the notebook in an instant. Conversion. Compared with the prior art, the notebook computer power supply circuit includes a first control circuit connected between the first output terminal and the second output terminal of the main battery, and first and second output terminals and a main battery of the backup battery. a second control circuit between the first output terminals of the battery, and since the length of the first output terminal of the main battery is less than the length of the second output terminal, when the main power 098129616 is numbered Α0101, page 5/19 pages 0982050810- 0 201109903 When the pool is pulled out, the first output terminal of the main battery is disconnected from the notebook computer earlier than the second output terminal to form a short time difference. During the time difference, the first and second control circuits switch the control state. The switching from the power supply of the main battery to the notebook computer to the power supply of the backup battery to the notebook computer is completed, and the switching process can be completed without shutting down the host computer, which is convenient to use. [Embodiment] [0007] The notebook type of the present invention will be described below with reference to the accompanying drawings. The computer power supply circuit is further explained. 0008 [0008] Please refer to FIG. 1 , in the embodiment of the present invention, a notebook computer power supply circuit is used for powering a power consumption system 10 of a notebook computer, such as a motherboard, including an AC power source 20, a charging circuit 30, and a The embedded controller 40, a main battery 50, a first control circuit 60, a backup battery 70 and a second control circuit 80. Referring to FIG. 2 and FIG. 3, the main battery 50 and the backup battery 70 respectively include a plurality of electrical connection terminals. In this embodiment, the main battery 50 and the backup battery 70 respectively include seven electrical connection terminals. Wherein the first and second terminals are both connected to the ground. The fourth and fifth terminals are read information terminals, which can be used by the notebook computer to read information about the capacity, type, and remaining power of the battery through the embedded controller 40. The third terminal is the spare terminal, which is used when extending the function. The sixth and seventh terminals 51 (71) and 52 (72) are output terminals for outputting power to the main board 10 of the notebook computer. The main battery 50 and the backup battery 70 also respectively include two fixed terminals, namely eighth and ninth terminals, which are mainly used to connect the main battery 50 and the backup battery 70 to respective positions in the notebook computer. In this embodiment, the main battery 098129616 form number A0101 page 6 / 19 pages 0982050810-0 201109903 5 〇 detachably inserted in the first battery slot (not shown) on the main board 10 and the backup battery 70 is fixed The ground is mounted in a second battery slot (not shown) on the main board 10. The first and second battery slots respectively include a plurality of terminals corresponding to the terminals on the main battery 50 and the backup battery 70, respectively. [0010] When the main battery 50 and the backup battery 70 are respectively installed in the first and second battery slots of the notebook computer, the seven electrical connection terminals thereof and the terminals in the first and second battery slots respectively They are electrically connected to each other, and the outer surfaces of the two fixed terminals are provided with copper foil, and the fixed terminals are connected to the ground while the battery and the 7 〇 are respectively fixed in the corresponding battery slots. The seventh terminal 52 of the main battery 50 is slightly shorter than the sixth terminal 51, and the sixth and seventh bets 71 and 72 of the backup battery 7 are connected to form a first node 73. The first control circuit 60 includes first and second field effect transistors electrically connected to the sixth terminal 5丨 of the main battery 50, Q2, and a third field effect transistor Q3 electrically connected to the seventh terminal 52 of the main battery 5〇. a first resistor ri and a second resistor R2. The first and second field effect transistors Q1 and Q2 are both P-channel enhancement type MOSFETs. The drain of the first field effect transistor Q1 is electrically connected to the sixth terminal 51 of the main battery 50 via an inductor Li. The source of the first field effect transistor qi is electrically connected to the source of the second field effect transistor Q2. The pole of the second field effect transistor Q2 serves as a power source output terminal 61 through which the main battery 50 supplies power to the main board 10 via the first control circuit 60. The third field effect transistor Q3 is an N-channel enhancement type MOS field effect transistor. The gate of the third field effect transistor Q3 is electrically connected to the seventh terminal 52 of the main battery 50. One end of the first resistor R1 is electrically connected to the gate of the third field effect transistor Q3, and the other end is connected to the ground. The source of the third field effect transistor Q3 is connected to the ground. The pole of the third field effect transistor Q3 is electrically connected to the gate of the first field effect transistor Q1 'the pole of the third field effect transistor Q3 and the first field effect 098129616 Form No. A0101 Page 7 / 19 pages 0992050810 -0 201109903 Formed between the poles - the second junction, the second pole - a far board 1. One of the electric power connections is connected, and the other end is connected to the second one. The touch «can be the output of the backup battery 7G through the lower power supply. The gate of the second field effect transistor Q2 is electrically connected to the charging circuit 30. When the notebook computer is connected to the alternating current (four) through the power adapter (not shown), the embedded control (4) can read the main battery 5__ Whether or not the power source or the like control charging circuit 30 charges the main battery 50. [0011] The first control circuit 8G includes fourth and fifth field effects _, Q5 connected to the first node 7, and sixth and seventh field effect transistors connected to the seventh terminal 52f of the pool 5 [ Q6, Q7, - third resistor R3 and a fourth resistor R4. The fourth and fifth field effect transistors Q4 and Q5 are both p-channel enhancement type MOSFETs. The drain of the fourth field effect transistor q4 is electrically connected to the first node 73 through an inductor [2]. The source of the fourth field effect transistor 4 is electrically connected to the source of the fifth field effect transistor Q5. The drain of the fifth field effect transistor is used as the power supply output terminal 81 of the backup battery 70 to the main board 1 through the second control circuit 80. The gate of the fifth field effect transistor Q5 is electrically connected to the charging circuit 3'. When the notebook computer is connected to the AC power source 2 through the power adapter, the embedded controller 40 can control whether the charging circuit 30 charges the backup battery 7 by reading information such as the remaining power in the backup battery 7?. The sixth and seventh field effect transistors Q6 and Q7 are N-channel enhancement type MOS field effect transistors. The gate of the sixth field effect transistor Q6 is electrically connected to the seventh terminal 52 of the main battery 50. The source of the sixth field effect transistor Q6 is connected to the ground. The drain of the sixth field effect transistor Q6 is electrically connected to the gate of the seventh field effect transistor Q7, and forms the 098129616 form number between the drain of the sixth field effect transistor Q6 and the gate of the seventh field effect transistor Q7. Α0101 Page 8 of 19 0982050810-0 201109903 Three nodes 82. One end of the third resistor R3 is electrically connected to the power source VDD, and the other end is electrically connected to the third node 82. The source of the seventh field effect transistor Q7 is connected to the ground, and the drain is electrically connected to the gate of the fourth field effect transistor Q4. A fourth node 83 is formed between the drain of the seventh field effect transistor Q7 and the gate of the fourth field effect transistor Q4. One end of the fourth resistor R4 is electrically connected to the power supply VDD, and the other end is electrically connected to the fourth node 83. [0012] When the main battery 50 is mounted in the first and second battery slots in the notebook computer correspondingly to the backup battery 70, a high potential is formed at the seventh terminal 52 of the main battery 50. Therefore, the gate of the third field effect transistor Q3 in the first control circuit 60 is extremely high, and the gate-source voltage is greater than the turn-on voltage of the third field effect transistor Q3. Therefore, the third field effect transistor Q3 is turned on. At the same time, the power supply VDD forms a loop between the drain of the second FET R2, the third FET Q3 and the source and the ground, so that the gate of the first FET Q1 is extremely low relative to the 汲, the first field The effect tube Q1 is turned on. Since the first and second FETs Q1 and Q2 have a common source, at this time, the main battery 50 can form a path between the sixth terminal 51 and the first and second FETs Q1 and Q2 and the power output terminal 61. The main battery 50 can supply power to the notebook. At the same time, since the high potential is formed at the seventh terminal 52 of the main battery 50, the gate of the sixth FET Q6 in the second control circuit 80 is also formed at a high potential, and the gate-source voltage is greater than the sixth field effect. The turn-on voltage of the tube Q6 is such that the sixth field effect transistor Q6 is turned on. At the same time, the power supply VDD forms a loop between the drain of the third field effect transistor 〇6 and the source and the ground through the third resistor R3, so that the gate of the seventh field effect transistor Q7 is extremely low, and the seventh field effect The gate-source voltage of the tube Q7 is less than the turn-on voltage, and thus the seventh field effect transistor Q7 is turned off. At this time, the power supply VDD connected to the fourth node 83 and the fourth power 098129616 Form No. A0101 Page 9 / 19 pages 0982050810-0 201109903 The resistance R4 makes the gate of the fourth field effect transistor Q4 relatively high. The potential fourth field effect transistor Q4 is turned off. At this time, the sixth and seventh terminals 71'72 of the backup battery 7''' are disconnected from the power supply output terminal due to the end of the fourth FET Q4, and the backup battery 70 cannot supply power to the notebook computer. [0014] When the power of the main battery 50 is insufficient, the system will send a warning message to inform the user, at this time, the user can pull the main battery 5 〇 directly from the first battery slot of the notebook computer. When the user turns the main battery 5 〇 When the first terminal 52 of the main battery 5 is shorter than the sixth terminal 51, the seventh terminal 52 is disconnected from the notebook computer earlier than the sixth terminal 51. The connection 'forms' is a short time difference. During this time difference, the seventh terminal 52 of the main battery 50 is switched from a high potential to a low potential, and the sixth terminal 51 remains electrically connected to the pair of terminals in the battery cell to maintain a high potential. Since the seventh terminal 52 of the main battery 50 is at a low potential, the gate-source voltage of the third FET Q3 in the first control circuit 60 is smaller than the turn-on voltage of the third FET Q3, and the third FET q3 is turned off. Among them, connected to the third The first resistance between the gate and the ground of the effect transistor Q3 is, crystal #;.-φ...2..:: to ensure that the third field effect transistor Q3 is turned off in time. Since the third field effect transistor Q3 is cut off The power supply VDD and the second resistor R2 connected to the second node 62 make the gate of the first FET Q1 extremely high with respect to 汲, and thus the first FET Q1 is turned off. The first FET Q1 is cut off. The main battery 50 is opened between the sixth terminal 51 and the power output terminal 61, and the main battery 50 is no longer supplied with power to the notebook computer. Within this time difference, 'because the seventh terminal 52 of the main battery 50 is low, The sixth FET Q6 in the second control circuit 80 is smaller than the turn-on voltage of the sixth FET Q6, and thus the sixth FET Q6 is turned off. At the same time, even 098129616 Form No. A0101 Page 10/19 pages 0982050810-0 [ [0017] The VDD power supply connected to the third node 82 and the third resistor R3 are such that the gate-source voltage of the seventh FET Q7 is greater than the turn-on voltage of the seventh FET Q7. The seventh field effect transistor Q7 is turned on. Since the seventh field effect transistor Q7 is turned on, the power supply VDD is turned on. The fourth resistor R4, the drain of the seventh field effect transistor 、7, and the source and the ground form a loop, so that the gate of the fourth field effect transistor Q4 is extremely low relative to the 汲, and the fourth FET Q4 is turned on. Since the fourth and fifth field effect transistors Q4 and Q5 have a common source, at this time, the backup battery 70 can pass through the sixth and seventh terminals 71, 72, the fourth and fifth field effect transistors Q4 and Q5, and the power output terminal. A path is formed between 81, and the backup battery 70 supplies power to the notebook computer, thereby switching from the main battery 50 to the notebook computer in time to switch from the backup battery 70 to the notebook computer. t| 1 liiil 'll It is understandable that if the user has a replaceable main battery, the replaceable main battery can be directly inserted into the second battery slot when the backup battery 70 is low. . Finally, the notebook computer power supply circuit of the present invention can make the notebook computer do not need to be turned off in the case that the main battery 50 is insufficient in power, and directly complete the main battery 50 to the notebook computer by simply unplugging the main battery 50. The power supply is switched to the conversion of the backup battery 70 to the notebook. Therefore, the notebook computer power supply circuit can make the notebook computer work uninterrupted when the main battery 50 is extremely low and replace the backup battery 70, avoiding the problem that the user needs to shut down to replace the battery, or the user is mistakenly electrified by the battery. The loss of important information and materials has the advantage of being easy to use. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, such as 098,129,616, Form No. A0101, Page 11 of 19, 0982050810-0 [0018] 201109903 Those skilled in the art, equivalent in the spirit of the present invention Modifications or variations are intended to be included within the scope of the claims below. BRIEF DESCRIPTION OF THE DRAWINGS [0020] FIG. 1 is a functional block diagram of a notebook computer power supply circuit in an embodiment of the present invention. 2 is a schematic diagram of a circuit for supplying power to a notebook computer through a first control circuit in the embodiment of the present invention. Fig. 3 is a circuit diagram showing the circuit for supplying power to the notebook computer through the second control circuit in the embodiment of the present invention. [Main component symbol description] [0022] Power consumption system 10 AC power supply 20 Charging circuit 30 Embedded controller 40 Main battery 50 Sixth terminal 51 Seventh terminal 52 First control circuit 60 Power output terminal 61 Second node 62 Backup battery 70 sixth terminal 71 seventh terminal 72 first node 73 second control circuit 80 power output terminal 81 third node 82 fourth node 83 field effect transistors Ql, Q2, Q3, Q4, Q5, Q6, Q7 Inductor LI, L2 Resistor Rl ' R2 , R3 , R4 Form No. A0101 Page 12 / Total 19 Page 0992050810-0 098129616 201109903 --
I電源 VDDI power supply VDD
098129616 表單編號A0101 第13頁/共19頁 0982050810-0098129616 Form No. A0101 Page 13 of 19 0982050810-0