200915642 九、發明說明： ， 【發明所屬之技術領域】 本發明涉及一種電池保護電路，特別涉及一種 貝現電池過溫自動保護的電路。 【先前技術】 目前，電子設備如手機、電子玩具等已經非常 普遍，在給電子設備如手機充電時，當電池充久了 >星度會上升到一較高的程度，容易燒壞電池，而電 子玩具等耗電大的電子設備在工作過程中，很容易 由於溫度過高而使得電池發生爆漿而損壞電路 板，甚至會爆炸而產生危險。因此有必要對電池在 充放電過程中進行過溫保護。 中國大陸知識產權局2006年11月22日公主 的一份公告號為“CN2840470Y”，名稱為“、I二 檢測控制電路”的專利文件中，揭露了—種溫度： 、 測控制電路，能夠實現電池充放電情況下的過溫保 護。該溫度檢測控制電路通過一熱敏電阻檢測溫度 值，將該溫度值轉換成電壓值，然後通過一智慧晶 片的測溫引腳測量該電壓值，由智慧晶片對該電壓 值與一基準電壓作一個判定比較，輸出—控制電平 實現保護控制。然而，電池在充電及放電的情況下 允許的最大溫度是有區別的，一般放電情況下允許 的取大溫度要高於充電情況下允許的最大溫度。該 專利所揭露的技術方案在充電情況下和放電情況 7 200915642 下，是在到達同一溫度時進行過溫保護控制，沒有 提供一個根據充放電情況調整保護的臨界溫度的 電路，這樣，若將臨界溫度設置為充電情況下允許 的最大溫度，則放電情況下，當電池溫度達到該臨 界溫度則電池放電被切斷，然而此時電池還可處於 正常工作狀態，造成了不必要的動作。而且，該溫 度檢測採用智慧晶片^成本比較而。 【發明内容】 有鑒於此，提供一種電池過溫保護電路，能夠 對電池充放電不同情況下的過溫進行相應的保護 及報警。 一種電池過溫保護電路，包括一連接埠、一充 電模組、一溫度檢測模組、一基準電壓提供電路、 一比較模組、一控制模組以及一電池路徑開關。 其中連接埠用於接入市電適配器為電池充電 提供電源、一充電模組用於對電池進行充電，該充 電模組包括一充電控制引腳、一充電電流輸入引 腳、一充電電流輸出引腳。該溫度檢測模組，用於 將電池的溫度值轉換成一溫度電壓，該基準電壓提 供電路，用於提供電池處於充電狀態以及放電狀態 下不同的基準電壓值。該比較模組，包括一正相輸 入端、一反相輸入端以及一輸出端，用於將該溫度 檢測單元轉換成的溫度電壓與基準電壓進行比 較，並輸出過溫保護信號。該控制模組，有一控制 8 200915642 端與比較模組的輸出端相連，用於接收該過溫保護 • 信號，控制充電模組停止工作。該電池路徑開關位 . 於電池的供電路徑通路中，有一控制端與比較模組 的輸出端相連，用於接收該過溫保護信號，切斷電 池供電路徑。 該電池過溫保護電路還包括一報警電路，用於 響應該過溫保護信號，從而發出報警信號。其中， 充電情況下允許的最大溫度低於放電情況下允許 的最大溫度。在放電情況下，當溫度高於放電時允 許的最大溫度時，電池路徑開關截止，從而電池的 供電路徑被切斷，並由報警電路發出報警信號，在 充電情況下，當溫度高於充電時允許的最大溫度 時，控制模組控制充電模組停止對電池充電，並由 報警電路發出報警信號。 這樣，通過本發明能夠對電池充放電情況下過 溫時進行保護及報警，而且對電池在充電情況下過 溫保護的最大溫度低於電池放電情況下過溫保護 的最大溫度，符合一般放電時允許的最大溫度高於 充電時允許的最大溫度的情況。而且，不需要專門 的智慧晶片對溫度轉換成的電壓作一個比較判 定，降低了成本。 【實施方式】 請參閱圖1 ^為電池過溫保護電路的模組架構 圖。該電池過溫保護電路1包括一充電模組10、 200915642 一控制模組30、一溫度檢測模組4〇、一比較模組 5〇、一基準電壓提供電路60、一連接埠8〇以及一 電池路徑開關90。 該充電模組10用於對電池20充電。該連接璋 80用於接入市電適配器。該溫度檢測模組4〇用於 私測電池20的溫度並輸出一反映該電池2〇溫度的 電壓信號（以下稱為溫度電壓）。基準電壓提供電 路60用於提供兩種基準電壓，一種為電池充電情 況下的基準電壓Vrefl，另一種為電池放電情況下 的基準電壓Vref2。該電池路徑開關90位於電池的 供電路徑通路中。該比較模組50用於比較溫度檢 測模組40輸出的溫度電壓與基準電壓的大小，該 比較模組5G有-輸出端（圖中未示出）與電池路 徑開關9G的控制端（圖中未示出）以及控制模組 30的控制端（圖中未示出）連接。 當接入連接埠80的市電適配器通過充電模組 1〇對電池2G充電時，比較模組％通過比較該溫 度電壓與基準電壓域的大小從而判斷溫度是否 上升到充電允許的最大溫度，當判斷溫度上升到充 電允許的最大溫度時’則輸出一過溫保護信號。該 控制模組3G在接㈣過溫㈣信號後控制充電模 、-且10V止對電池20充電。該比較模組5〇還可連 接tr報警電路70 ’該報警電路70接收到過溫保 濩Uu後發出報警信號，該報警的方式可以為聲音 200915642 報警或閃燈等方式。 在放電情況下，當比較模組50通過比較該溫 度電壓與基準電壓Vref2的大小從而判斷溫度是否 上升到放電允許的最大溫度，發現溫度上升到放電 允許的最大溫度時，比較模組50輸出一過溫保護 信號，該電池路徑開關90收到該過溫保護信號後 截止，從而切斷電池20的供電路徑，同時報警電 路70發出報警信號。 請參閱圖2，為電池過溫保護電路第一實施方 式的具體電路圖。該充電模組10有一充電控制引 腳101、一充電電流輸入引腳102、一充電電流輸 出引腳103，該充電模組10可具體為浚特公司 (Linear Technology Corporation)的 LT1571 系列充 電晶片，其中，充電電流輸入引腳102對應LT1571 晶片的Vcc引腳，充電電流輸出引腳103對應 LT1571晶片的Bat引腳，充電控制引腳101對應 LT1571晶片的Vc引腳。充電電流輸入引腳102與 連接埠80的電壓正極端連接，充電電流輸出引腳 103與電池20的正極連接，充電控制引腳101為 低電平時，該充電模組10停止對電池20充電。 在本實施方式中，比較模組50為一比較器， 有一正相輸入端B、一反相輸入端A以及一輸出端 (圖中未不出）。該控制扭組30為'一南電平導通開 關，電池路徑開關90為一低電平導通開關，該控 11 200915642 制模組30和電池路徑開關90均有一控制端、一第 一導通端以及一第二導通端。該控制模組30和電 池路徑開關90可以為MOS管或三極管，本實施方 式中控制模組30以一 NMOS型電晶體（NMOS 管）Q3為例進行說明，電池路徑開關90以一 PMOS 管Q4為例進行說明，其中NMOS管Q3和PMOS 管Q4的栅極、源極、漏極分別對應控制模組30 和電池路徑開關90的控制端、第一導通端、第二 導通端。該NMOS管Q3的栅極與比較模組50的 輸出端連接，源極直接與接地點F連接，漏極與充 電模組10的充電控制引腳101連接，NMOS管Q3 的源極與漏極之間跨接有一電阻R10。該電池路徑 開關90的栅極與比較模組50的輸出端連接，源極 與電池20的正極P連接，漏極與一電壓輸出端100 連接。該電壓輸出端100為市電適配器、電池20 等電源在放電情況下的公共電壓輸出端。其中，當 電池放電或市電適配器接入連接埠80時，均通過 該電壓輸出端100輸出電壓後通過DC/DC轉換器 (圖中未不出）轉換成設備需要的電壓後為設備供 電。 電勢點Η的電壓可通過電池20或市電適配器 提供，本實施方式中設該電壓為VI。當連接埠80 接入市電適配器對電池充電時，由市電適配器電壓 通過一 DC/DC轉換器（圖中未示出）轉換得到該 12 200915642 電壓VI，當電池放電過程中，由電池電壓通過一 • DC/DC轉換器（圖中未示出）轉換得到該電壓VI， • 該電勢點Η不論充電放電還是在過溫保護動作後 都會有一電壓VI存在。 該基準電壓提供電路60用於提供充電情況下 的基準電壓Vrefl以及放電情況下的基準電壓 Vref2。該基準電壓提供電路60由第一開關部件 601、第二開關部件602、一分壓電路以及數個電 阻組成。該第一、第二開關部件601、602分別包 括一控制端與第一、第二導通端（圖中未示出）， 且第一開關部件601為高電平導通開關，第二開關 部件602為低電平導通開關。本實施方式中該第一 開關部件601、第二開關部件602分別採用NMOS 管Ql、PMOS管Q2作為示範進行說明，其第一、 第二開關部件601和602的控制端對應MOS管的 栅極，第一導通端對應MOS管的源極，第二導通 端對應MOS管的漏極。該分壓電路包括順序串聯 於電勢點Η與接地點E之間的第一、第二與第三 分壓電阻R6、R7、R8，電阻R7與電阻R8之間的 節點連接到比較模組50的正相輸入端Β用以提供 基準電壓Vref。 設該NMOS管Q1的柵極為C，漏極為D，則 柵極C通過一電阻R1與連接埠80的電壓正極端 連接，該柵極C還通過一電阻R2與接地點E連接； 13 200915642 漏極D通過一電阻R3與電壓VI連接，該NMOS 管Q1的源極直接與接地點E連接。該PMOS管 Q2的柵極通過一電阻R4與NMOS管Q1的漏極相 連，該PMOS管Q2的源極直接與電勢點Η連接， PMOS管Q2的漏極連接至電阻R6與電阻R7之間 的節點。 當充電情況下，即連接埠80接入市電適配器 時，本實施方式中，市電適配器的輸出電壓為 12V，該連接埠80的電壓正極端獲得一高電平。 則NMOS管Q1的栅極C也獲得一高電平，從而 NMOS管Q1導通，因此，Q1的漏極D被拉低成 低電平。該低電平通過電阻R4施加于PMOS管 Q2的柵極並導通該PMOS管Q2，從而旁路PMOS 管Q2漏極與源極之間的第一分壓電阻R6，此時 Vrefl=Vl*R8/(R8 + R7)。 在電池20放電情況下，即電池20為設備供 電，連接埠80未接入市電適配器時，NMOS管Q1 的栅極C通過電阻R2導通到地而處於低電平，從 而NMOS管Q1截止，從而PMOS管Q2的柵極通 過電阻R3、R4與電勢點Η短接而獲得一高電平， 從而 PMOS 管 Q2 也截止，則此時 Vref2=Vl*R8/(R8 + R7+R6)<Vrefl。從而在充電情況 下的基準電壓Vrefl高於放電情況下的基準電壓 Vref2 。 14 200915642 該溫度檢測模組40由熱敏電阻R9以及一分壓 電阻R5串聯組成，該溫度檢測模組40位於電勢點 Η以及一接地點E之間，其中，熱敏電阻R9位於 靠近接地點Ε的一端。在本實施方式中，該熱敏電 阻R9為一負溫度係數電阻，位於電池20内，該熱 敏電阻R9比較模組的遠地端與比較模組50的反相 輸入端Α連接，該熱敏電阻R9的遠地端Α的電壓 即為溫度檢測模組40將溫度值轉換成的溫度電 壓，本實施方式中，該溫度電壓在正常情況下大於 基準電壓Vref，可由分壓電路以及溫度檢測模組中 電阻的電阻值的設定選取來確定。 在本實施方式中’報警電路70為一面電平觸 發的報警電路，該報警電路70為習知電路，故不 多加闡述。 在充電情況下，比較模組50的基準電壓Vren 等於V1*R8/(R8 + R7)，隨著電池20的溫度上升， 溫度電壓下降，當溫度電壓下降到小於基準電壓 Vref 1時，比較模組50輸出一高電平信號即為過溫 保護信號，NMOS管Q3的栅極接收到該過溫保護 信號而處於高電平，從而NMOS管Q3導通，充電 模組10的充電控制引腳101通過該導通的NMOS 管Q3短接到地而處於低電平，從而充電模組10 停止對電池充電。同時，報警電路70收到該高電 平信號後發出報警信號。 15 200915642 在放電情況下，比較 叫丞平电壓Vref 1 等於V1*r8/(r8+r7+R6)，隨著電池20的溫户上 升，溫度電壓下降，當溫度電壓下降到小於基ς電 壓vref2時，比較模組50輸出—高電平信號即為 過溫保護信號，電池路徑開關90收到該高電平信 號後截止，切斷電池的供電路徑，同時，報警電路 70收到該過溫保護信號後發出報警信號。 由於該熱敏電阻R9為一負溫度係數電阻，電 阻值與溫度成反比，則溫度檢測模組4〇轉換的2 度電壓與溫度成反比，又由於充電情況下的基準電 壓Vrefl高於放電情況下的基準電壓加2,則二 著溫度的升高，相對於放電情況下，該溫度電壓^ 充電情況下要早一些低於基準電壓。實現了在電池 充放電過溫保護中，放電情況下允許的最高溫度高 於充電情況下允許的最高溫度，並在充放電時進: 過溫保護並報警，這符合電池過溫保護的原理，因 為電池放電情況下’電池允許的最大溫度比充電产 況下要高。 @ 該第一、第二開關部件601、6〇2、控制模組 30以及電池路徑開關9〇還可為三極管，該第—、 第二開關部件601、6〇2、控制模組3〇以及電池路 徑開關90的控制端對應三極管的基極，第—導通 端對應二極警的發射極，第二導通端對應三極管的 集電極，且第—開關部件601和控制模組30為Npn 16 200915642 里一極g第一開關部件602和電池路徑開關9〇 為PNP型三極管。 中本貝知方式中的過溫保護電路在過溫保 護後，充電或放電狀態可恢復。當溫度降下來，使 得溫度電壓高於基準電壓時，比較模組50輸出-低電平信號，則充電情況下，控制模組3〇接收到 該低電平截止，充電模組1G重新處於工作狀離， =電情況下，該電池路㈣關9G接㈣該低電平 信號導通’從而導通放電路徑，則電池2()可對外 供電。 明參閱圖3，為電池過溫保護電路第二實施方 式的具體電路圖。與第—實施方式相比，第二實施 方式中，該第二開關部# 6〇2，為—高電平導通開 關，具體可為NMOS管或NPN三極管。則在充電 情況下’由於第一開關部# 6〇1導通，則第二開關 部件602'的控制端通過電阻R4與接地點e短接而 拉低為低電平，從而第二開關部件6〇2，截止，從而 在充電情況下的基準電壓 vrefl=vl*R8/(R8+R7+R6)。而在放電情況下，由 於第-開關部# 6G1截止’則第二開關部件6〇2, 的控制端通過電阻R3與電勢點H連接而被拉高為 高電平，從而第二開關部件6〇1導通旁路第一分壓 電阻R6 ’則在放電情況下的基準電壓 vref2=vl*R8/(R8+R7)>Vrefl。在本實施方式中， 17 200915642 溫度電壓在正常情況下低於基準電壓，可由分壓電 路以及溫度檢測模組中電阻的電阻值設定選取來 確定。 在本實施方式中，該熱敏電阻R9，為一正溫度 係數電阻，熱敏電阻R9,的遠地端與比較模組5〇 的反相輸入端連接。該電池路徑開關90'為一高電 平導通開關，具體可為NMOS管或ΝΡΝ=極管。 該控制模組30為一低電平導通開關，具體可為 PMOS管或ΡΝΡ三極管。 由於熱敏電阻R9’為一正溫度係數電阻，則當 溫度上升時，溫度電壓增大。當在充電情況下溫度 電壓大於基準電壓Vrefl時，比較模組5〇輸出— 低電平的過溫保護信號，則控制模組3〇接收到該 低電平過溫保護信號而導通，則充電模組1〇的充 電控制引腳101處於低電平，充電模組1〇停止董子 %池20充電，本實施方式中，報警電路70為一低 電平觸發的報警電路’則報警電路7〇接收該低電 平的過溫保護電路後進行報警。 在放電情況下，當溫度電壓大於基準電蜃200915642 IX. Description of the Invention: [Technical Field] The present invention relates to a battery protection circuit, and more particularly to a circuit for over-temperature automatic protection of a battery. [Prior Art] At present, electronic devices such as mobile phones and electronic toys have become very common. When charging electronic devices such as mobile phones, when the battery is charged for a long time, the star will rise to a high level, and it is easy to burn the battery. In the working process, electronic devices such as electronic toys, which are high in power consumption, can easily cause the battery to burst and damage the circuit board due to excessive temperature, and may even explode and cause danger. Therefore, it is necessary to protect the battery from overheating during charging and discharging. The Intellectual Property Office of the Chinese Mainland Intellectual Property Office issued a notice on November 22, 2006, entitled "CN2840470Y", the patent document entitled "I, II Detection Control Circuit", which revealed a temperature: measurement control circuit that can be realized. Over temperature protection in case of battery charge and discharge. The temperature detecting control circuit detects the temperature value through a thermistor, converts the temperature value into a voltage value, and then measures the voltage value through a temperature measuring pin of the smart chip, and the voltage value and the reference voltage are made by the smart chip. One decision compares the output-control level to achieve protection control. However, the maximum allowable temperature of the battery in the case of charging and discharging is different. In general, the maximum allowable temperature for discharging is higher than the maximum temperature allowed for charging. The technical solution disclosed in the patent under the charging condition and the discharging condition 7 200915642 is to perform over-temperature protection control when reaching the same temperature, and does not provide a circuit for adjusting the critical temperature of protection according to the charging and discharging condition, so that if the criticality is The temperature is set to the maximum temperature allowed under charging conditions. In the case of discharge, when the battery temperature reaches the critical temperature, the battery discharge is cut off, but at this time, the battery can also be in a normal working state, causing unnecessary action. Moreover, the temperature detection uses a smart wafer ^ cost comparison. SUMMARY OF THE INVENTION In view of the above, a battery over-temperature protection circuit is provided, which can protect and alarm an over-temperature under different conditions of charge and discharge of a battery. A battery over-temperature protection circuit includes a connection port, a charging module, a temperature detecting module, a reference voltage supply circuit, a comparison module, a control module and a battery path switch. The connection port is used for accessing the mains adapter to provide power for charging the battery, and a charging module is used for charging the battery. The charging module includes a charging control pin, a charging current input pin, and a charging current output pin. . The temperature detecting module is configured to convert a temperature value of the battery into a temperature voltage, and the reference voltage providing circuit is configured to provide different reference voltage values when the battery is in a charging state and a discharging state. The comparison module includes a positive phase input terminal, an inverting input terminal and an output terminal for comparing a temperature voltage converted by the temperature detecting unit with a reference voltage, and outputting an over temperature protection signal. The control module has a control terminal 8 200915642 connected to the output end of the comparison module for receiving the over temperature protection signal and controlling the charging module to stop working. The battery path switch position. In the power supply path of the battery, a control end is connected to the output end of the comparison module for receiving the over-temperature protection signal and cutting off the power supply path of the battery. The battery over-temperature protection circuit further includes an alarm circuit for responding to the over-temperature protection signal to generate an alarm signal. Among them, the maximum temperature allowed under charging is lower than the maximum temperature allowed under discharge. In the case of discharge, when the temperature is higher than the maximum temperature allowed during discharge, the battery path switch is turned off, so that the power supply path of the battery is cut off, and an alarm signal is issued by the alarm circuit. When the temperature is higher than the charging state under charging, When the maximum temperature is allowed, the control module controls the charging module to stop charging the battery, and an alarm signal is sent by the alarm circuit. In this way, the present invention can protect and alarm when the battery is overheated under the condition of charging and discharging, and the maximum temperature of the over-temperature protection for the battery under charging condition is lower than the maximum temperature of the over-temperature protection under the battery discharge condition, which is in accordance with the general discharge time. The maximum allowable temperature is higher than the maximum temperature allowed during charging. Moreover, there is no need for a dedicated smart chip to make a comparative determination of the temperature converted into a voltage, which reduces the cost. [Embodiment] Please refer to Figure 1 for the module architecture diagram of the battery over-temperature protection circuit. The battery over-temperature protection circuit 1 includes a charging module 10, 200915642, a control module 30, a temperature detecting module 4A, a comparison module 5A, a reference voltage supply circuit 60, a connection port 8〇, and a Battery path switch 90. The charging module 10 is used to charge the battery 20. This port 80 is used to access the mains adapter. The temperature detecting module 4 is configured to privately measure the temperature of the battery 20 and output a voltage signal (hereinafter referred to as a temperature voltage) reflecting the temperature of the battery 2 . The reference voltage supply circuit 60 is for supplying two reference voltages, one is a reference voltage Vref1 in the case of battery charging, and the other is a reference voltage Vref2 in the case of battery discharge. The battery path switch 90 is located in the power path of the battery. The comparison module 50 is configured to compare the temperature of the temperature and the reference voltage output by the temperature detecting module 40. The comparison module 5G has an output end (not shown) and a control end of the battery path switch 9G (in the figure). Not shown) and the control terminal (not shown) of the control module 30 is connected. When the mains adapter of the access port 80 charges the battery 2G through the charging module 1 , the comparison module % determines whether the temperature rises to the maximum temperature allowed by the charging by comparing the temperature voltage with the magnitude of the reference voltage domain. When the temperature rises to the maximum temperature allowed for charging, an over-temperature protection signal is output. The control module 3G controls the charging mode after the (four) over temperature (four) signal, and charges the battery 20 at 10V. The comparison module 5〇 can also be connected to the tr alarm circuit 70'. The alarm circuit 70 receives an over-temperature protection 濩Uu and sends an alarm signal, which can be sound 0915642 alarm or flashing. In the case of discharge, when the comparison module 50 compares the temperature voltage with the reference voltage Vref2 to determine whether the temperature rises to the maximum allowable temperature of the discharge, and finds that the temperature rises to the maximum allowable temperature of the discharge, the comparison module 50 outputs a The over-temperature protection signal, the battery path switch 90 is turned off after receiving the over-temperature protection signal, thereby cutting off the power supply path of the battery 20, and the alarm circuit 70 issues an alarm signal. Please refer to FIG. 2 , which is a specific circuit diagram of the first embodiment of the battery over temperature protection circuit. The charging module 10 has a charging control pin 101, a charging current input pin 102, and a charging current output pin 103. The charging module 10 can be specifically a LT1571 series charging chip of Linear Technology Corporation. The charging current input pin 102 corresponds to the Vcc pin of the LT1571 chip, the charging current output pin 103 corresponds to the Bat pin of the LT1571 chip, and the charging control pin 101 corresponds to the Vc pin of the LT1571 chip. The charging current input pin 102 is connected to the positive terminal of the voltage of the port 80, the charging current output pin 103 is connected to the positive terminal of the battery 20, and when the charging control pin 101 is low, the charging module 10 stops charging the battery 20. In the present embodiment, the comparison module 50 is a comparator having a positive phase input terminal B, an inverting input terminal A, and an output terminal (not shown). The control twist group 30 is a 'one south level conduction switch, and the battery path switch 90 is a low level conduction switch. The control 11 200915642 system module 30 and the battery path switch 90 have a control end and a first conduction end. a second conductive end. The control module 30 and the battery path switch 90 can be a MOS transistor or a triode. In the present embodiment, the control module 30 is described by taking an NMOS transistor (NMOS transistor) Q3 as an example. The battery path switch 90 is a PMOS transistor Q4. For example, the gate, the source, and the drain of the NMOS transistor Q3 and the PMOS transistor Q4 correspond to the control terminal, the first conductive terminal, and the second conductive terminal of the control module 30 and the battery path switch 90, respectively. The gate of the NMOS transistor Q3 is connected to the output end of the comparison module 50, the source is directly connected to the ground point F, the drain is connected to the charge control pin 101 of the charging module 10, and the source and the drain of the NMOS transistor Q3 are connected. There is a resistor R10 across. The battery path switch 90 has a gate connected to the output of the comparator module 50, a source connected to the anode P of the battery 20, and a drain connected to a voltage output terminal 100. The voltage output terminal 100 is a common voltage output terminal of a power supply such as a mains adapter and a battery 20 in a discharged state. Wherein, when the battery is discharged or the commercial power adapter is connected to the port 埠80, the voltage is outputted through the voltage output terminal 100, and then converted into the voltage required by the device through the DC/DC converter (not shown) to supply power to the device. The voltage at the potential point can be supplied by the battery 20 or the commercial power adapter. In the present embodiment, the voltage is VI. When the port 接入80 is connected to the mains adapter to charge the battery, the voltage of the mains adapter is converted by a DC/DC converter (not shown) to obtain the 12200915642 voltage VI. When the battery is discharged, the battery voltage is passed through • The DC/DC converter (not shown) converts this voltage VI. • This potential point 有一 has a voltage VI present regardless of the charge discharge or after the overtemperature protection action. The reference voltage supply circuit 60 is for supplying the reference voltage Vref1 in the case of charging and the reference voltage Vref2 in the case of discharging. The reference voltage supply circuit 60 is composed of a first switching part 601, a second switching part 602, a voltage dividing circuit, and a plurality of resistors. The first and second switching components 601 and 602 respectively include a control terminal and first and second conduction terminals (not shown), and the first switching component 601 is a high-level conduction switch, and the second switching component 602 is A low level switch. In the embodiment, the first switch component 601 and the second switch component 602 are respectively exemplified by an NMOS transistor Q1 and a PMOS transistor Q2, and the control ends of the first and second switch components 601 and 602 correspond to the gate of the MOS transistor. The first conduction end corresponds to the source of the MOS tube, and the second conduction end corresponds to the drain of the MOS tube. The voltage dividing circuit comprises first, second and third voltage dividing resistors R6, R7, R8 sequentially connected in series between the potential point Η and the grounding point E, and the node between the resistor R7 and the resistor R8 is connected to the comparison module The positive phase input terminal 50 of 50 is used to provide a reference voltage Vref. The gate of the NMOS transistor Q1 is C, and the drain is D. The gate C is connected to the positive terminal of the voltage of the connection port 80 through a resistor R1. The gate C is also connected to the ground point E through a resistor R2. 13 200915642 Leakage The pole D is connected to the voltage VI through a resistor R3, and the source of the NMOS transistor Q1 is directly connected to the ground point E. The gate of the PMOS transistor Q2 is connected to the drain of the NMOS transistor Q1 through a resistor R4. The source of the PMOS transistor Q2 is directly connected to the potential point ,, and the drain of the PMOS transistor Q2 is connected between the resistor R6 and the resistor R7. node. In the case of charging, that is, when the connection port 80 is connected to the commercial power adapter, in the present embodiment, the output voltage of the commercial power adapter is 12V, and the positive terminal of the voltage of the connection port 80 obtains a high level. Then, the gate C of the NMOS transistor Q1 also obtains a high level, so that the NMOS transistor Q1 is turned on, and therefore, the drain D of Q1 is pulled low to a low level. The low level is applied to the gate of the PMOS transistor Q2 through the resistor R4 and turns on the PMOS transistor Q2, thereby bypassing the first voltage dividing resistor R6 between the drain and the source of the PMOS transistor Q2. At this time, Vrefl=Vl*R8 /(R8 + R7). In the case that the battery 20 is discharged, that is, the battery 20 supplies power to the device, and when the connection port 80 is not connected to the commercial power adapter, the gate C of the NMOS transistor Q1 is turned to the ground through the resistor R2, and the NMOS transistor Q1 is turned off, thereby The gate of the PMOS transistor Q2 is short-circuited with the potential point 通过 through the resistors R3 and R4 to obtain a high level, so that the PMOS transistor Q2 is also turned off, then Vref2=Vl*R8/(R8 + R7+R6)<Vrefl . Therefore, the reference voltage Vref1 in the case of charging is higher than the reference voltage Vref2 in the case of discharging. 14 200915642 The temperature detecting module 40 is composed of a thermistor R9 and a voltage dividing resistor R5 connected in series. The temperature detecting module 40 is located between the potential point Η and a grounding point E, wherein the thermistor R9 is located near the grounding point. One end of the cockroach. In the present embodiment, the thermistor R9 is a negative temperature coefficient resistor located in the battery 20, and the remote end of the thermistor R9 comparison module is connected to the inverting input terminal 比较 of the comparison module 50. The voltage at the remote end of the resistor R9 is the temperature voltage that the temperature detecting module 40 converts the temperature value into. In the present embodiment, the temperature voltage is greater than the reference voltage Vref under normal conditions, and can be divided by a voltage dividing circuit and a temperature detecting module. The setting of the resistance value of the resistor in the group is selected to determine. In the present embodiment, the alarm circuit 70 is an alarm circuit that is triggered by one level. The alarm circuit 70 is a conventional circuit, and therefore will not be described. In the case of charging, the reference voltage Vren of the comparison module 50 is equal to V1*R8/(R8 + R7), and as the temperature of the battery 20 rises, the temperature voltage drops, and when the temperature voltage drops below the reference voltage Vref1, the comparison mode The group 50 outputs a high level signal which is an over temperature protection signal. The gate of the NMOS transistor Q3 receives the over temperature protection signal and is at a high level, so that the NMOS transistor Q3 is turned on, and the charging control pin 101 of the charging module 10 The NMOS transistor Q3 that is turned on is shorted to ground and is at a low level, so that the charging module 10 stops charging the battery. At the same time, the alarm circuit 70 sends an alarm signal after receiving the high level signal. 15 200915642 In the case of discharge, the comparison voltage Vref 1 is equal to V1*r8/(r8+r7+R6). As the temperature of the battery 20 rises, the temperature voltage drops, and when the temperature voltage drops below the base voltage vref2 When the output module 50 outputs a high-level signal, it is an over-temperature protection signal. After receiving the high-level signal, the battery path switch 90 is turned off to cut off the power supply path of the battery. At the same time, the alarm circuit 70 receives the over-temperature. An alarm signal is issued after the signal is protected. Since the thermistor R9 is a negative temperature coefficient resistor and the resistance value is inversely proportional to the temperature, the temperature of the temperature detecting module 4〇 is inversely proportional to the temperature, and the reference voltage Vrefl is higher than the discharging condition due to the charging condition. When the lower reference voltage is increased by 2, the temperature rises. Compared with the discharge condition, the temperature voltage is lower than the reference voltage earlier in the charging situation. In the battery charge and discharge over temperature protection, the maximum temperature allowed under the discharge condition is higher than the maximum temperature allowed under the charging condition, and enters during the charge and discharge: over temperature protection and alarm, which is in line with the principle of battery over temperature protection, Because the battery is discharged, the maximum temperature allowed by the battery is higher than that under the charging condition. @ The first and second switch parts 601, 6〇2, the control module 30, and the battery path switch 9A may also be a triode, the first and second switch parts 601, 6〇2, the control module 3〇, and The control end of the battery path switch 90 corresponds to the base of the triode, the first conduction end corresponds to the emitter of the two-pole alarm, the second conduction end corresponds to the collector of the triode, and the first switch component 601 and the control module 30 are Npn 16 200915642 The first pole member 602 and the battery path switch 9 are PNP type transistors. The over-temperature protection circuit in the Nakamoto method can be restored after the over-temperature protection. When the temperature is lowered, so that the temperature voltage is higher than the reference voltage, the comparison module 50 outputs a low-level signal, and in the case of charging, the control module 3 receives the low-level cutoff, and the charging module 1G is in operation again. Displacement, = under the electric condition, the battery circuit (four) off 9G connection (four) the low-level signal conducts 'and thus conducts the discharge path, then the battery 2 () can supply external power. Referring to FIG. 3, it is a specific circuit diagram of the second embodiment of the battery over-temperature protection circuit. Compared with the first embodiment, in the second embodiment, the second switch portion #6〇2 is a high-level turn-on switch, and specifically may be an NMOS transistor or an NPN transistor. Then, in the case of charging, since the first switch portion #6〇1 is turned on, the control terminal of the second switch member 602' is short-circuited to the ground point e by the resistor R4 to be pulled low, so that the second switch member 6 〇2, cutoff, and thus the reference voltage vrefl=vl*R8/(R8+R7+R6) in the case of charging. In the case of discharge, since the first switch portion #6G1 is turned off, the control terminal of the second switch member 6〇2 is pulled high to the potential point H through the resistor R3, so that the second switch member 6 〇1 turns on the bypass first voltage dividing resistor R6', then the reference voltage vref2=vl*R8/(R8+R7)>Vrefl in the case of discharge. In the present embodiment, 17 200915642 temperature voltage is lower than the reference voltage under normal conditions, and can be determined by setting the resistance value of the resistor in the voltage dividing circuit and the temperature detecting module. In the present embodiment, the thermistor R9 is a positive temperature coefficient resistor, and the distal end of the thermistor R9 is connected to the inverting input terminal of the comparison module 5A. The battery path switch 90' is a high level conduction switch, specifically an NMOS tube or a ΝΡΝ= pole tube. The control module 30 is a low-level conduction switch, which may specifically be a PMOS transistor or a triode transistor. Since the thermistor R9' is a positive temperature coefficient resistor, the temperature voltage increases as the temperature rises. When the temperature voltage is greater than the reference voltage Vref1 under the charging condition, the comparison module 5 outputs an over-temperature protection signal of a low level, and the control module 3 receives the low-level over-temperature protection signal and is turned on, then charging The charging control pin 101 of the module 1 is at a low level, and the charging module 1 stops the charging of the Dongzi% pool 20. In the present embodiment, the alarm circuit 70 is a low-level triggered alarm circuit, then the alarm circuit 7进行After receiving the low level over-temperature protection circuit, an alarm is issued. In the case of discharge, when the temperature voltage is greater than the reference voltage
Vref2日守’比較模組5〇輸出一低電平的過溫保護信 唬，則電池路徑開關9〇接收到該低電平過溫保蠖 信號而截止，切斷電池2〇的供電路徑，同時報警 電路70接收到該低電平過溫保護信號而發出報邀 信號。 § 18 200915642 由於，在本實施方式中，充電情況下基準電壓 Vreflc放電情況下基準電壓Vref2，則充電情況 下，溫度電壓更早大於基準電壓。仍然實現了在電 池充放電過溫保護中，充電情況下允許的最高溫度 低於放電情況下允許的最高溫度，在充放電時進行 過溫保護並報警。同樣，本實施方式也可以在過溫 保護後恢復充電或放電狀態。 本發明不受以上具體實施方式的限制，可根據 本發明的技術方案和實際情況確定的具體的實施 方式。 通過本發明，實現了電池充電以及放電過程的 過溫保護，在充電情況下允許的最大溫度低於放電 情況下的最大溫度。在充電情況下，當溫度高於充 電時允許的最大溫度時，控制充電模組停止對電池 充電，同時由報警電路發出報警信號。在放電情況 下，當溫度高於放電所允許的最大溫度時，電池的 供電路徑被切斷，電池停止對外供電，同時由報警 電路發出報警信號。此外，過溫保護後可恢復充電 或放電狀態。 【圖式簡單說明】 圖1是電池過溫保護電路的方塊圖。 圖2是電池過溫保護電路弟一實施方式的具體 電路圖。 圖3是電池過溫保護電路第二實施方式的具體 19 200915642Vref2 守守' comparison module 5 〇 output a low level over-temperature protection signal, the battery path switch 9 〇 receives the low-level over-temperature protection signal and cuts off, cut off the battery 2 供电 power supply path, At the same time, the alarm circuit 70 receives the low level over-temperature protection signal and sends an invitation signal. § 18 200915642 Therefore, in the present embodiment, in the case of charging, the reference voltage Vref1 is discharged in the case of charging, and in the case of charging, the temperature voltage is earlier than the reference voltage. In the battery charge and discharge over temperature protection, the maximum temperature allowed under the charging condition is lower than the maximum temperature allowed under the discharge condition, and the over temperature protection is performed during the charge and discharge and the alarm is issued. Also, in the present embodiment, the charging or discharging state can be restored after the over temperature protection. The present invention is not limited by the above specific embodiments, and may be embodied in accordance with the technical solutions of the present invention and the actual embodiments. With the present invention, over-temperature protection of the battery charging and discharging process is achieved, and the maximum temperature allowed in the case of charging is lower than the maximum temperature in the case of discharging. In the case of charging, when the temperature is higher than the maximum temperature allowed during charging, the control charging module stops charging the battery, and an alarm signal is issued by the alarm circuit. In the case of discharge, when the temperature is higher than the maximum temperature allowed by the discharge, the power supply path of the battery is cut off, the battery stops supplying power to the outside, and an alarm signal is issued by the alarm circuit. In addition, the overcharge protection can restore the charging or discharging state. [Simple diagram of the diagram] Figure 1 is a block diagram of the battery over-temperature protection circuit. Fig. 2 is a detailed circuit diagram of an embodiment of a battery over-temperature protection circuit. 3 is a specific embodiment of a battery over temperature protection circuit. 19 200915642
電路圖。 【主要元件符號說明】 電池過溫保護電路 1 充電模組 10 電池 20 控制模組 30 溫度檢測模組 40 比較模組 50 基準電壓提供模組 60 報警電路 70 連接埠 80 電池路徑開關 90 電壓輸出端 100 充電控制引腳 101 充電電流輸入引腳 102 充電電流輸出引腳 103 第一開關部件 601 第二開關部件 602 第二開關部件 602’ 電阻 R1/R2/R3/R4/R5/R6/R7/R8/R10 熱敏電阻 R9 熱敏電阻 R9' 反相輸入端 A 正相輸入端 B 20 200915642 拇極 C 漏極 D 接地點 E/F 電勢點 Η NMOS 管 Ql/ Q3 PMOS 管 Q2/ Q4 電壓 VI 基準電壓 Vref 21Circuit diagram. [Main component symbol description] Battery over temperature protection circuit 1 Charging module 10 Battery 20 Control module 30 Temperature detection module 40 Comparison module 50 Reference voltage supply module 60 Alarm circuit 70 Connection 埠80 Battery path switch 90 Voltage output terminal 100 charging control pin 101 charging current input pin 102 charging current output pin 103 first switching part 601 second switching part 602 second switching part 602' resistance R1/R2/R3/R4/R5/R6/R7/R8 /R10 Thermistor R9 Thermistor R9' Inverting input A Positive input B 20 200915642 Thumb P C Drain Ground E/F Potential Η NMOS Q1 / Q3 PMOS Q2 / Q4 Voltage VI Reference Voltage Vref 21