201224486 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種偵測可充電電池電量的檢測裝置，特別 是涉及一種在電池充電過程中精確地偵測可充電電池實 際充電電量的檢測裝置。 【先前技術】201224486 VI. Description of the Invention: [Technical Field] The present invention relates to a detecting device for detecting the amount of rechargeable battery, and more particularly to an accurate detecting of the actual charging amount of a rechargeable battery during battery charging. Detection device. [Prior Art]
[0002] 隨著現在掌上型電子裝置的蓬勃發展，例如手機，其通 常需要電池來作為電子裝置所需電力的主要來源，故對 電池進行充電便成為用戶必須要做的工作，因此，如何 對可充電電池進行有效性充電成為一項相當重要的技術 。一般而言，在電池充電過程中，是通過偵測電池電量 來判斷電池充電完成情況。然而，由於電池中有内阻， 在充電過程中該内阻對應於充電電流會產生一電壓降AV ，電壓偵測裝置偵測到的電池電壓V實際為該電壓降 與真正的電池電壓VB之和，因此在測定上往往受到電池 内阻的干擾而影響其精確性，也就是說高估可充電電池 電量值。因此，電壓偵測裝置往往在電池電量未充滿時 即給出了充滿提示，導致用戶在電池尚未充滿電量就停 止充電，這樣增加了電池的充放電次數，而電池充放電 次數的增多，會縮短電池的迴圈使用壽命。 【發明内容】 [0003] 有鑒於此，有必要提供一種可精確偵測可充電電池實際 充電量的檢測裝置。 [0004] 一種可充電電池電量檢測裝置，包括可充電電池、電源 管理晶片及外電源介面，該外電源介面連接於電源管理 099141989 表單編號A0101 第4頁/共16頁 0992072910-0 201224486 晶片及控制電路，用於接入外部電源從而給電源管理晶 片及控制電路提供電源，該電源管理晶片具有一充電端 及一電壓偵測端，該可充電電池電量檢測裝置還包括： [0005] 一充電開關，連接於電源管理晶片的充電端及可充電電 池，用於控制該電源管理晶片對可充電電池進行充電或 停止充電； [0006] —電壓偵測開關，連接於電源管理晶片的電壓偵測端及 可充電電池，用於控制電源管理晶片偵測或停止偵測可 充電電池的電壓；以及 [0007] —控制電路，該控制電路具有一調變信號輸出端，該調 變信號輸出端與充電開關及電壓偵測開關均連接，用於 輸出週期性變化的調變信號以控制充電開關及電壓偵測 開關的通斷； [0008] 其中，當該控制電路輸出第一調變信號時，該充電開關 導通而該電壓偵測開關截止，電源管理晶片對該可充電 電池進行充電，並暫停偵測可充電電池的電壓；當該控 制電路輸出第二調變信號時，該充電開關截止而該電壓 偵測開關導通，該電源管理晶片暫停對可充電電池進行 充電，並偵測該可充電電池的電壓。 [0009] 本發明的可充電電池電量檢測裝置，通過控制電路控制 電源管理晶片間歇性地給可充電電池充電，並在充電暫 停的時候偵測可充電電池的電壓，可充電電池的内阻由 於沒有充電電流流過而不產生壓降，因此偵測到的可充 電電池的電壓為其實際電壓，從而可以準確地得出可充 099141989 表單編號A0101 第5頁/共16頁 0992072910-0 201224486 電電池的電量資訊以判斷可充電電池充電的完成情況， 延長可充電電池的迴圈使用壽命。 【實施方式】 [0010] [0011] [0012] 請參閱圖1，該可充電電池電量檢測裝置100包括一外電 源介面10、一電源管理晶片20、一充電開關22、一電壓 "ί貞測開關3 2、 一控制電路4 0以及一可充電電池5 〇。 其中，該外電源介面1 〇連接於電源管理晶片2 〇及控制電 路40，用於接入外部電源從而提供給電源管理晶片2〇及 控制電路40所需的電源。該電源管理晶月2〇具有一充電 端21及一電壓偵測端31，該電源管理晶片2〇通過充電端 21給可充電電池50充電，通過電壓偵測端31偵測可充電 電池50的電壓，並對偵測到的可充電電池5〇的電壓進行 處理並判斷該可充電電池50是否充滿電。 該充電開關22—端與電源管理晶片2〇的充電端21連接， 另一為與可充電電池5〇連接，用於控制讓電源管理晶片 20對可充電電池5〇進行充電或停也充；電。該電壓偵測開 關32一端與電源管理晶片20的電壓摘測端31連接，另一 端與可充電電池5〇連接，用於控制電源管理晶片2〇偵測 或停止偵測可充電電池50的電壓。[0002] With the rapid development of handheld electronic devices, such as mobile phones, which usually require batteries as the main source of power required for electronic devices, charging the battery becomes a work that the user must do, and therefore, how to The efficient charging of rechargeable batteries has become a very important technology. Generally speaking, during battery charging, the battery charge is judged by detecting the battery charge. However, due to the internal resistance in the battery, the internal resistance corresponds to the charging current during the charging process, and a voltage drop AV is generated. The battery voltage V detected by the voltage detecting device is actually the voltage drop and the true battery voltage VB. And, therefore, the measurement is often affected by the internal resistance of the battery and affects its accuracy, that is, overestimating the value of the rechargeable battery. Therefore, the voltage detecting device often gives a full prompt when the battery is not fully charged, so that the user stops charging when the battery is not fully charged, which increases the number of times of charging and discharging of the battery, and the number of times of charging and discharging the battery is shortened. Battery life of the loop. SUMMARY OF THE INVENTION [0003] In view of the above, it is necessary to provide a detecting device that can accurately detect the actual amount of charge of a rechargeable battery. [0004] A rechargeable battery power detecting device comprising a rechargeable battery, a power management chip and an external power supply interface, the external power supply interface being connected to the power management 099141989 Form No. A0101 Page 4 / 16 pages 0992072910-0 201224486 Wafer and Control The circuit is configured to be connected to an external power source to provide power to the power management chip and the control circuit. The power management chip has a charging end and a voltage detecting end. The rechargeable battery power detecting device further includes: [0005] a charging switch a charging end connected to the power management chip and a rechargeable battery for controlling the power management chip to charge or stop charging the rechargeable battery; [0006] - a voltage detecting switch connected to the voltage detecting end of the power management chip And a rechargeable battery for controlling the power management chip to detect or stop detecting the voltage of the rechargeable battery; and [0007] a control circuit having a modulated signal output, the modulated signal output and charging The switch and the voltage detecting switch are connected for outputting a periodically changing modulation signal to control charging on Turning on and off the voltage detecting switch; [0008] wherein, when the control circuit outputs the first modulated signal, the charging switch is turned on and the voltage detecting switch is turned off, and the power management chip charges the rechargeable battery. And suspending detecting the voltage of the rechargeable battery; when the control circuit outputs the second modulation signal, the charging switch is turned off and the voltage detecting switch is turned on, and the power management chip pauses charging the rechargeable battery, and detects the The voltage of the rechargeable battery. [0009] The rechargeable battery power detecting device of the present invention controls the power management chip to charge the rechargeable battery intermittently through the control circuit, and detects the voltage of the rechargeable battery when the charging is suspended, and the internal resistance of the rechargeable battery is No charging current flows without generating a voltage drop, so the detected voltage of the rechargeable battery is its actual voltage, so that it can be accurately obtained. 099141989 Form No. A0101 Page 5 / Total 16 Page 0992072910-0 201224486 The battery power information to determine the completion of the rechargeable battery charging, extend the life of the rechargeable battery. [0012] Referring to FIG. 1, the rechargeable battery power detecting device 100 includes an external power supply interface 10, a power management chip 20, a charging switch 22, and a voltage " The measuring switch 3 2, a control circuit 40 and a rechargeable battery 5 〇. The external power interface 1 is connected to the power management chip 2 and the control circuit 40 for accessing an external power source to supply power to the power management chip 2 and the control circuit 40. The power management chip 2 has a charging terminal 21 and a voltage detecting terminal 31. The power management chip 2 charges the rechargeable battery 50 through the charging terminal 21, and detects the rechargeable battery 50 through the voltage detecting terminal 31. The voltage is processed and the detected voltage of the rechargeable battery 5 〇 is processed to determine whether the rechargeable battery 50 is fully charged. The charging switch 22 is connected to the charging end 21 of the power management chip 2A, and the other is connected to the rechargeable battery 5A for controlling the power management chip 20 to charge or stop charging the rechargeable battery 5; Electricity. The voltage detecting switch 32 is connected at one end to the voltage detecting end 31 of the power management chip 20, and the other end is connected to the rechargeable battery 5A for controlling the power management chip 2 to detect or stop detecting the voltage of the rechargeable battery 50. .
[0013] 該控制電路40具有一調變信號輸出端41，該調變信號輸 出端41與充電開關22及電壓偵測開關32均連接，用於輸 099141989 出週期性變化的調變信號以控制充電 開關22及電壓偵測 開關32的通斷’從而使得電源管理晶片2〇以脈衝的方式 以穩定的電流間隔性地給可充電電池50充電，並於充電 暫停期間偵測可充電電池5 0的電壓。 表單編號Α0101 第6頁/共16頁 0992072910-0 201224486 _衫施方式巾’在-，若該㈣電路4{)的調變 信號輪出端41輸出一第一調變信號至該充電開關22及電 壓偵測開關32，則充電開關22導通而該電壓债測開關32 截止，電源管理晶片20通過充電端21給可充電電池5〇充 電，同時，電源管理晶片2〇暫停偵測可充電電池5〇的電 壓。若該控制電路40的調變信號輸出端41輸出一第二調 變k號至該充電開關22及電壓偵測開關32 ,則電壓偵測 開關32導通而該充電開關截止，電源管理晶片2〇通過電 壓偵測端31偵測可充電電池50的電壓，同時，電源管理 晶片20暫停給可充電電池50充電。 [0015] 〇 請參閱圖2，為可充電電池電量檢測裝置1〇〇的具體電路 。其中’該控制電路4〇包括二丨j犁（pWM)控制 器4 01以及一開關部件4 〇 2。本實施方式中，該{>^控制 器401包括一電源端4011及一脈衝脈衝信號輸出端4〇 j 2 ，該電源端4011與外電源介面1|)痒接，該雜衝信號輸出 端4012輸出週期性的脈衝信號，使控制電路的調變信 號輸出端41輸出週期性變吟的的^變信號，從而控制充 電過程及偵測電壓過程的交替進行。 [0016] 該開關部件402、充電開關22以及電壓偵測開關32均包括 一控制端與第一及第二導通端，本實施方式中，當該開 關部件402以及電壓偵測開關32的控制端為高電平時，該 開關部件402以及充電開關22處於導通狀態，否則截止； 當該充電開關22的控制端為低電平時，該充電開關22處 於導通狀態，否則截止。 [0017] 本實施方式中，該充電開關22採用PMOS管Q1，該電壓偵 099141989 表單編號 A0101 第 7 頁/共 16 頁 0992072910-0 201224486 測開關32和開關部件4〇2分別採用nm〇s管Q2、Q3。充電 開關22、電壓偵測開關32以及開關部件4〇2的控制端對應 M0S管的柵極，第一導通端對應肘⑽管的源極，第二導通 端對應M0S管的漏極。 [0018] 下面對可充電電池電量檢測裝置1 〇 〇的連接結構以及工作 狀態進行說明。 [0019] 设關此管03的柵極為G，通過一電阻ri連接到p龍控制器 401的脈衝信號輸出端4012，以接收來自pwM控制器401 的脈衝信號’設接地點為S ’ q 3的栅極g還通過電阻R 2與 接地點S連接’ Q3的源極直接與該接地點δ連接；q3的漏 極為D，通過電阻R3連接到外電源介面1〇，Q3的漏極])還 通過穩壓管D1與Q1的栅極及Q2的柵極連接。⑽⑽管⑽的 漏極連接到電源管理晶片2〇的電壓偵測端31 ;源極連接 到可充電電池50。1>臟管以的漏極連接到電源管理晶片 20的充電端21 ; Q1的源極_接到可充電電池5〇。 [0020] 在上述的連接方式下，當控制器4Ϊ) 1輸出高電平信號 時，NM0S管Q3的栅極G處於高電平，關⑽管叩導通導 致PM0S管Q1及腿0S管Q2的柵極通過導通的隨〇8營如短 接到地而處於低電平，即如前所述控制電路4()的調變信 號輸出端41輸出一第一調變信號，從而抑⑽管以導通， 電源管理晶片20通過充電端21給可充電電池5〇充電， NM0S管Q2載止，電源管理晶片2{)暫停㈣可充電電池⑽ 的電壓。[0013] The control circuit 40 has a modulation signal output terminal 41, and the modulation signal output terminal 41 is connected to the charging switch 22 and the voltage detection switch 32 for outputting a periodically changing modulation signal to control 099141989. The charging switch 22 and the voltage detecting switch 32 are turned on and off to enable the power management chip 2 to charge the rechargeable battery 50 in a pulsed manner at a steady current interval, and detect the rechargeable battery 50 during the charging pause. Voltage. Form No. 1010101 Page 6 of 16 0992072910-0 201224486 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ And the voltage detecting switch 32, the charging switch 22 is turned on and the voltage debt detecting switch 32 is turned off, the power management chip 20 charges the rechargeable battery 5 through the charging terminal 21, and the power management chip 2 〇 pauses detecting the rechargeable battery 5 〇 voltage. If the modulation signal output terminal 41 of the control circuit 40 outputs a second modulation k number to the charging switch 22 and the voltage detecting switch 32, the voltage detecting switch 32 is turned on and the charging switch is turned off, and the power management chip 2〇 The voltage of the rechargeable battery 50 is detected by the voltage detecting terminal 31, while the power management chip 20 suspends charging of the rechargeable battery 50. [0015] 〇 Referring to FIG. 2, it is a specific circuit of the rechargeable battery power detecting device 1〇〇. Wherein the control circuit 4 includes a two-pile plow (pWM) controller 410 and a switching component 4 〇 2. In this embodiment, the controller 401 includes a power terminal 4011 and a pulse signal output terminal 4〇j 2 , and the power terminal 4011 is connected to the external power interface 1 |), and the signal output terminal is The 4012 outputs a periodic pulse signal, so that the modulated signal output terminal 41 of the control circuit outputs a periodically changing signal, thereby controlling the alternate process of the charging process and the detecting voltage process. The switch component 402, the charging switch 22, and the voltage detecting switch 32 each include a control terminal and first and second conductive terminals. In this embodiment, the switching component 402 and the control terminal of the voltage detecting switch 32 are provided. When the level is high, the switch component 402 and the charging switch 22 are in an on state, otherwise turned off; when the control terminal of the charging switch 22 is at a low level, the charging switch 22 is in an on state, otherwise it is turned off. [0017] In this embodiment, the charging switch 22 uses a PMOS transistor Q1, and the voltage detection 099141989 Form No. A0101 Page 7 of 16 0992072910-0 201224486 The measuring switch 32 and the switching component 4〇2 respectively adopt an nm〇s tube Q2, Q3. The control terminal of the charging switch 22, the voltage detecting switch 32 and the switching component 4〇2 corresponds to the gate of the MOSFET, the first conducting end corresponds to the source of the elbow (10) tube, and the second conducting end corresponds to the drain of the MOS tube. [0018] Next, the connection structure and operation state of the rechargeable battery power detecting device 1 will be described. [0019] The gate of the tube 03 is set to G, and is connected to the pulse signal output terminal 4012 of the p-long controller 401 through a resistor ri to receive the pulse signal from the pwM controller 401, and the grounding point is S 'q 3 The gate g is also connected to the ground point S through the resistor R 2 'The source of Q3 is directly connected to the ground point δ; the drain of q3 is D, and is connected to the external power supply interface 1〇, the drain of Q3 through the resistor R3] It is also connected to the gate of Q1 and the gate of Q2 through the Zener diode D1. (10) (10) The drain of the tube (10) is connected to the voltage detecting terminal 31 of the power management chip 2; the source is connected to the rechargeable battery 50. 1> the drain of the dirty tube is connected to the charging terminal 21 of the power management chip 20; Q1 The source _ is connected to the rechargeable battery 5 〇. [0020] In the above connection mode, when the controller 4Ϊ) 1 outputs a high level signal, the gate G of the NM0S tube Q3 is at a high level, and the (10) tube is turned on to cause the PM0S tube Q1 and the leg 0S tube Q2. The gate is at a low level by being turned on to the battalion if it is shorted to the ground, that is, the modulated signal output terminal 41 of the control circuit 4() outputs a first modulated signal, thereby suppressing (10) Turning on, the power management chip 20 charges the rechargeable battery 5 through the charging terminal 21, the NM0S tube Q2 is loaded, and the power management chip 2 {) suspends (4) the voltage of the rechargeable battery (10).
[0021] 當PWM控制器4〇1輸出低電平信號時，NM0S管Q3的柵極G 099141989 表單編號A0101 第8頁/共16頁 0992072910-0 201224486 ❹ [0022] 處於低電平，誦S_載止，此時PMOS歸及酬S管 Q2的純均通過穩壓管D1及電阻r3與外電源介面1〇相連 而獲知個南電平’即如前所述控制電路4〇的調變信號 輸出端41輪出-第二調變信就，從而削^管以截止電 源管理晶片20暫停輸出充電電流給可充電電池5〇充電， NMOS s Q2導通，電源管理晶片2〇通過電壓偵測端“開始 Μ可充電電池50的電壓。這時，由於沒有充電電流流 過，在可充電電池50的内阻上不產生壓降，因此偵測到 的可充電電池的電壓為其實際電壓。 在整個充電過程中，電源管理晶片20還反復地將偵測到 的可充電電池5G的電壓與—預設電壓值相雜，以判斷 對可充電電池5G進行充電或不充電^當電源管理晶片2〇 伯測到可充電電池50的電壓達到預設電壓值時，電源管 理晶片20麟可充電電池5Q的充電完成，並關及鎖定 充電端21，停止通過充電·輸出充電電流給可充電電 池50充電。 〇 [0023] 該充電開關22、電·積測開關32以及開關部件4〇2還可為 三極管，其控制端分別對應三極管的基極，第一導通端 分別對應二極管的發射極’第二導通端分別對應三極管 的集電極，且電壓偵測開關32和開關部件4〇2為卿型三 極管’充電開關22為PNP型三極管。 [0024] 本發明的可充電電池電量檢測裝置1〇〇，通過控制電路4〇 控制電源管理晶片20間歇性地給可充電電池5〇充電，並 在充電暫停的時候偵測可充電電池5〇的電壓，可充電電 池5 0的内阻由於沒有充電電流流過而不產生壓降，因此 099141989 0992072910-0 表單編號A0101 第9頁/共16頁 201224486 偵測到的可充電電池的電壓為其實際電壓，從而可以準 確地得出電池的電量資訊以判斷可充電電池5 0充電的完 成情況，延長可充電電池的迴圈使用壽命。 [0025] 本技術領域的普通技術人員應當認識到，以上的實施方 式僅是用來說明本發明，而並非用作為對本發明的限定 ，只要在本發明的實質精神範圍之内，對以上實施例所 作的適當改變和變化都落在本發明要求保護的範圍之内 〇 【圖式簡單說明】 [0026] 圖1為本發明中一實施例中可充電電池電量檢測裝置的架 構圖。 [0027] 圖2為圖1中的可充電電池電量檢測裝置的具體電路圖。 【主要元件符號說明】 [0028] 可充電電池電量檢測裝置：100 [0029] 外電源介面：10 [0030] 電源管理晶片：20 [0031] 充電端：21 [0032] 充電開關：2 2 [0033] 電壓偵測端：31 [0034] 電壓偵測開關：32 [0035] 控制電路：40 [0036] PWM控制器·· 401 099141989 表單編號A0101 第10頁/共16頁 0992072910-0 201224486 4012 LUU37j 電源端：4 0 11 [0038] 脈衝信號輸出端： ' [0039] 開關部件：402 41 [0040] 調變信號輸出端 [0041] 可充電電池：50 Ο 099141989 表單編號A0101 第11頁/共16頁 0992072910-0[0021] When the PWM controller 4〇1 outputs a low level signal, the gate of the NM0S transistor Q3 is G 099141989 Form No. A0101 Page 8 / Total 16 Page 0992072910-0 201224486 ❹ [0022] At a low level, 诵S _Loading, at this time, the pure charge of the PMOS returning S tube Q2 is connected to the external power supply interface 1〇 through the Zener diode D1 and the resistor r3 to obtain a south level, that is, the modulation of the control circuit 4〇 as described above. The signal output terminal 41 rotates the second modulation signal, thereby cutting the tube to cut off the power supply management chip 20 to suspend the output charging current to charge the rechargeable battery 5, the NMOS s Q2 is turned on, and the power management chip 2 〇 passes the voltage detection The terminal "starts to charge the voltage of the rechargeable battery 50. At this time, since no charging current flows, no voltage drop occurs on the internal resistance of the rechargeable battery 50, so the detected voltage of the rechargeable battery is its actual voltage. During the entire charging process, the power management chip 20 repeatedly repeatedly compares the detected voltage of the rechargeable battery 5G with the preset voltage value to determine whether to charge or not charge the rechargeable battery 5G. 〇伯 detected that the voltage of the rechargeable battery 50 reached When the voltage value is set, the charging of the power management chip 20 the rechargeable battery 5Q is completed, and the charging terminal 21 is turned off and locked, and the charging battery 50 is stopped from being charged by the charging/output charging current. [0023] The charging switch 22, the electric The integrated measuring switch 32 and the switching component 4〇2 may also be a triode whose control end respectively corresponds to the base of the triode, and the first conducting end respectively corresponds to the emitter of the diode, and the second conducting end respectively corresponds to the collector of the triode, and the voltage The detecting switch 32 and the switching member 4〇2 are the Qing type transistor 'the charging switch 22 is a PNP type triode. [0024] The rechargeable battery power detecting device 1 of the present invention controls the power management wafer 20 intermittently through the control circuit 4 The rechargeable battery is charged 5 ,, and the voltage of the rechargeable battery 5 侦测 is detected when the charging is suspended. The internal resistance of the rechargeable battery 50 does not generate a voltage drop because no charging current flows, so 099141989 0992072910- 0 Form No. A0101 Page 9 of 16201224486 The detected voltage of the rechargeable battery is its actual voltage, so that the battery power can be accurately obtained. The life of the loop of the rechargeable battery is prolonged by judging the completion of charging of the rechargeable battery 50. [0025] Those skilled in the art will recognize that the above embodiments are merely illustrative of the invention, and not The present invention is intended to be limited to the scope of the present invention as long as it is within the spirit and scope of the invention. 1 is a block diagram of a rechargeable battery power detecting device in an embodiment of the present invention. 2 is a specific circuit diagram of the rechargeable battery power detecting device of FIG. 1. [Main component symbol description] [0028] Rechargeable battery power detecting device: 100 [0029] External power supply interface: 10 [0030] Power management chip: 20 [0031] Charging terminal: 21 [0032] Charging switch: 2 2 [0033 Voltage detection terminal: 31 [0034] Voltage detection switch: 32 [0035] Control circuit: 40 [0036] PWM controller · · 401 099141989 Form number A0101 Page 10 / Total 16 page 0992072910-0 201224486 4012 LUU37j Power supply Terminal: 4 0 11 [0038] Pulse signal output: ' [0039] Switch unit: 402 41 [0040] Modulated signal output [0041] Rechargeable battery: 50 Ο 099141989 Form No. A0101 Page 11 of 16 0992072910-0