1335707 099年07月30日接正替換頁 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明係關於一種通用串行總線充電電路及採用該電路 的電視電源電路。 【先前技術】 [0002] 隨著電子技術的發展，數位相機、手機、個人數位助理. (Personal Digital Assistant，PDA)等消費性電子 產品的使用越來越廣泛，電池尤其是可充電電池，由於 其能夠提供穩定的工作電壓而成為消費性電子產品的一 個重要組成部份。然而，由於消費性電子產品功能的逐 漸增多，其單位時間内的用電量逐漸增大，電池充電的 次數亦逐漸增多，人們對電池充電器的使用越來越頻繁 。同時，隨著消費性電子產品記憶體容量的不斷增加， 通用串行總線（Universal Serial Bus, USB)作為消 費性電子產品與個人電腦資料交換的媒介，其使用也越 來越頻繁。由於不同的電子產品都有各自的充電器和通 用串行總線，在生活中（特別是在旅行中）人們攜帶充電 器和通用串行總線的數量越來越多，給生活帶來諸多不 便。 [0003] 為了解決上述問題，目前通常使用通用串行總線實現數 據交換和電池充電的功能。請參閱圖1，係一種先前技術 ‘ 個人電腦之通用串行總線介面示意圖。該通用串行總線 ： 介面10包括依次水平排列的第一、第二、第三及第四連 接頭11、12、13、14,其中該第二連接頭12為該通用串 行總線傳送資料的正連接頭，該第三連接頭13為該通用 096113952 表單編號A0101 第4頁/共25頁 0993275208-0 1335707 [0004] [0005] [0006] [0007] 096113952 099年07月30日修正替换頁 串行總線傳送資料的負連接頭，消費性電子產品通過該 第二、第三連接頭12、13與個人電腦實現數據交換功能 。該第一連接頭11為一電源端，該第四連接頭14接地， 該第一、第四連接頭11、14分別與該通用串行總線相應 的電源端和接地端電連接，個人電腦提供一穩定的直流 電壓（該直流電壓通常為5V)於該通用串行總線介面10之 第一連接頭11，該直流電壓通過該通用串行總線為電池 充電。 然，由於個人電腦之通用串行總線介面10之第一連接頭 的電壓為一恆定值，使用該通用串行總線介面1 0為電池 充電是一恆壓充電的過程。在恆壓充電開始時，會產生 一較大的瞬間充電電流，該充電電流容易使電池損壞， 縮短了充電電池的壽命。 【發明内容】 有鑑於此，提供一種可減小電池開始充電時瞬間充電電 ' _ 流的通用串行總線充電電路:實為必要。 同時提供一種採用上述通用串行總線充電電路的電視電 源電路亦為必要。 一種通用串行總線充電電路，其包括：一輸入端；一 雙極電晶體；一整流濾波電感；一電流反饋電路；一電 壓反饋電路；一脈寬調變電路；及一輸出端；其中，該 雙極電晶體射極電連接該輸入端，其集極依次經過該整 流濾波電感、該電流反饋電路電連接該輸出端，該脈寬 調變電路提供一恆定的基準電壓，該電壓反饋電路電連 接於該輸出端與地之間，該電流反饋電路根據流經該整 表單編號Α0101 第5頁/共25頁 0993275208-0 1335707 ___· 099年07月30日隹正替换頁 流濾波電感之電流大小輸出反饋電壓至該脈寬調變電路 ，該電壓反饋電路根據輸出端之電壓輸出反饋電壓至該 脈寬調變電路，該脈寬調變電路依據該電壓反饋電路之 反饋電壓與該基準電壓之電壓大小決定以該電流反饋電 路之電流反饋還是該電壓反饋電路之電壓反饋來調整該 脈寬調變電路加載在該雙極電晶體基極上的脈衝電壓’ 當該電壓反饋電路之反饋電壓小於該基準電壓時，該脈 衝調變電路之電流反饋起控制作用並根據電流反饋增大 加載至雙極電晶體基極之脈衝電壓寬度，當該電壓反饋 電路之反饋電壓大於或等於該恆定基準電壓時，該脈衝 調變電路之電壓反饋起控制作用 [0008] —種電視電源電路，其包括一交直流轉換電路、一通用 串行總線充電電路及一通用串行總線介面，該通用串行 總線充電電路包括一雙極電晶體、一整流濾波電感、一 電流反饋電路、一電壓反饋電路及一脈寬調變電路，該 脈寬調變電路提供一恆定的基準電壓，該交直流轉換電 路將高頻交流電轉換為直流，轉換後之直流電壓加載至 該雙極電晶體的射極，並依次經過該雙極電晶體的集極 、該整流濾波電感及該電流反饋電路輸出到該通用串行 總線介面，該電壓反饋電路將該輸出端輸出的電壓反饋 至該脈寬調變電路，該電流反饋電路根據流經該整流濾 3 波電感之電流大小輸出反饋電壓至該脈寬調變電路，該 ： 脈寬調變電路依據該電壓反饋電路之反饋電壓與該基準 電壓之電壓大小決定以該電流反饋電路之電流反饋還是 該電壓反饋電路之電壓反饋來調整該脈寬調變電路加載 096113952 表單編號A0101 第6頁/共25頁 0993275208-0 1335707 099年07月30日修正替換頁 在該雙極電晶體基極上的脈衝電壓，從而調整加載在該 通用串行總線介面上的電壓，當該電壓反饋電路之反饋 電壓小於該基準電壓時，該脈衝調變電路之電流反饋起 控制作用並根據電流反饋增大加載至雙極電晶體基極之 脈衝電壓寬度，當該電壓反饋電路之反饋電壓大於或等 於該恆定基準電壓時，該脈衝調變電路之電壓反饋起控 制作用。 [0009] 與先前技術相比，本發明通用串行總線充電電路在開始 充電時，電流反饋起控制作用，充電電流逐漸增大到一 預定電流值，並以該預定電流進行恆流充電，當該電池 恆流充電到一預定電壓後，電塵反饋起控制作用，該通 U+: 用串行總線充電電路以該預；進行恆壓充電。由於 開始充電時，該充電電流逐漸增大，因此不會產生大的 瞬間充電電流，電池不會因充電開始時大的瞬間充電電 流而損壞。且由於電池先進行恆.流充電，再進行恆壓充 電，該電池充電更加充分有利於增加電池的壽命。採 用該通用串行總線充電電路的.電視電源電路，通過該通 用串行總線充電電路來控制加載在該通用串行總線介面 上的電壓，該電視電源電路具有恆流恆壓充電的功能， 電池不會因充電開始時大的瞬間充電電流而損壞，且該 電視電源電路對電池充電更加充分，有利於增加電池的 壽命。 【實施方式】 [0010] 請參閱圖2，係本發明通用串行總線充電電路示意圖。該 通用串行總線充電電路20包括一輸入端21、一雙極電晶 096113952 表單編號A0101 第7頁/共25頁 0993275208-0 1335707 099年07月30日接正替換頁 體22、一整流濾波電感23、一電流反饋電路24、一電壓 反饋電路25、一脈寬調變電路26、一充電指示電路27、 一輸出端28、第一、第二二極體291、293、一第一偏 置電阻295、一第二偏置電阻297及一第一分壓電阻299 [0011] 該輸出端28電連接一通用串行總線介面之電源連接頭（圖 未示）。 [0012] 該充電指示電路27包括一限流電阻271及一發光二極體 273。該發光二極體273負極接地，正極電連接該限流電 阻271 —端。 [0013] 該電壓反饋電路25包括依次串接在該輸出端28與地之間 的第一、第二、第三電壓反饋電阻251、253、255。該 第一、第三電壓反饋電阻251、255的電阻取值依次為6k q、10k q。該第二電壓反饋電阻253為一可變電阻， 其總電阻值為lkQ，可用於調整該第三電壓反饋電阻 255兩端的反饋電壓。 [0014] 該電流反饋電路24包括一第二分壓電阻241及第一、第二 、第三、第四電流反饋電阻242、243、244、245。該第 二分壓電阻241阻值為200 ，該第一、第二、第三、第四 電流反饋電阻242、243、244、245電阻值依次為590 D、20kg、590q、20kQ。該第一分壓電阻 241 一端藉由該整流濾波電感23電連接該雙極電晶體22之集 極，其另一端電連接該輸出端28。該第一電流反饋電阻 096113952 表單編號A0101 第8頁/共25頁 0993275208-0 1335707 099年07月30日修正 242—端藉由該第一分壓電壓24〗電連接該輪出端28，其 另一端藉由該第二電流反饋電阻243接地。 [0015] 該腋寬調變電路26包括一反饋電壓同相輸入端261、一反 饋電壓反相輸入端262、一恆定電壓輸出端263、一電源 輸入端264、一脈衝電壓輸出端265、一反饋電流同相輪 入端266及一反饋電流反相輸入端267。該反饋電壓同相 輸入端261藉由該第三電壓反饋電阻255接地，該反饋電 壓反相輪入端262藉由該第一分壓電阻299電連接該限流 電阻271另一端。該恆定電壓輸出端263亦電連接該限流 電阻271另一端，同時藉由該第四電流反饋電阻245電連 接該反饋電流反相輸入端267。該電源輸入端264電連接 該輸入端21，該脈衝電壓輸敎端马轉‘5讀由該第二偏置電阻 297電連接該雙極電晶體22的基極。該反饋電流同相輸入 端266藉由該第二電流反饋電阻243接地，該反饋電流反 相輸入端267藉由該第三電流反罈電阻244電連接該輸出 端28。 » , [0016] 該雙極電晶體22為一PNP型雙和 1 電晷體，其射極電連接該 輸入端21 ’該射極同時藉由該第一偏置電阻295電連接該 雙極電晶體22之基極。該第一偏置電阻295為該雙極電晶 體22提供一基極偏置電壓，該基極偏置電壓使該雙極電 晶體22處於開關狀態。 [0017] 該第一二極體291正極接地，負極電連接該輸入端，當 該輸入端21的電壓反相輸入時，該第一二極體291用於保 護該通用串行總線充電電路20。該第二二極體293為一續 流一極體，其正極接地，負極電連接該雙極電晶體22之 096113952 表單編號A0101 第9頁/共25頁 0993275208-0 1335707 099年07月30日核正替换頁 集極。 [0018] 該脈寬調變電路26具有電流反饋和電壓反饋的功能，在 同一時間，其中一種反饋起控制作用。該脈寬調變電路 26之電壓反饋的原理為：該反饋電壓反相輸入端262提供 一基準電壓，當該反饋電壓同相輸入端261之電壓大於該 基準電壓時，該脈衝電壓輸出端265輸出電壓的脈衝寬度 變小；當該反饋電壓同相輸入端261之電壓小於該基準電 壓時，該脈衝電壓輸出端265輸出電壓的脈衝寬度增大； 當該反饋電壓同相輸入端261之電壓等於該基準電壓時， 該脈衝電壓輸出端265輸出電壓的脈衝寬度不變。 [0019] 該脈寬調變電路26之電流反饋的原理為：當該反饋電流 同相輸入端266之電壓大於該反饋電流反相輸入端267之 電壓時，該脈衝電壓輸出端265輸出電壓的脈衝寬度變小 :當該反饋電流同相輸入端266之電壓小於該反饋電流反 相輸入端267之電壓時，該脈衝電壓輸出端265輸出電壓 的脈衝寬度增大；當該反饋電流同相輸入端266之電壓等 於該反饋電流反相輸入端267之電壓時，該脈衝電壓輸出 端265輸出電壓的脈衝寬度不變。 [0020] 當該第三電壓反饋電阻255兩端之反饋電壓（即該反饋電 壓同相輸入端261之電壓）大於或等於該反饋電壓反相輸 入端262之基準電壓時，該脈寬調變電路26之電壓反饋起 控制作用；當該第三電壓反饋電阻255兩端之反饋電壓小 於該反饋電壓反相輸入端262之基準電壓時，該脈寬調變 電路26之電流反饋起控制作用。上述電壓反饋與電流反 饋的控制轉換過程由該脈寬調變電路26之内部電路完成 096113952 表單編號 A0101 第 10 頁/共 25 頁 0993275208-0 1335707 |099_請日紐 _頁 [0021] 電池充電時，該通用串行總線充電電路20的工作原理如 下： [0022] 當待充電的電池電連接到該輸出端28進行充電時，該輸 入端21提供一穩定的直流電壓（該直流電壓的範圍為16 V 到25 V，通常為19V)，該直流電壓加載至該脈寬調變電 路26之電源輸入端264，該脈寬調變電路26開始工作並於 該恆定電壓輸出端263輸出一穩定的5V電壓，該5V電壓加 載至該充電指示電路27兩端，電流流過該發光二極體273 而使該發光二極體273發光，從而指示該通用串行總線充 電電路20開始充電。該恆定電壓輸出崎263輸出的5V電壓 同時藉由該第一分壓電阻299向該反饋:電壓反相輸入端 262提供一基準電壓（若該輸出端28輸出穩定的5V電壓， 則該基準電壓通常為3. 3V)。 [0023] 該輸出端28輸出之電壓由該第三電壓反饋電阻2 5 5兩端之 電壓反饋至該脈寬調變電路26之皮被％壓同相輸入端261 ，該反饋電壓小於該反饋電壓反相輸入端262之基準電壓 ，該脈寬調變電路26之電流反饋起控制作用。該輸出端 28之輸出電流在該第二分壓電阻241兩端產生一壓降，其 中，該第二分壓電阻241連接該整流濾波電感23 —端的電 壓藉由該第一、第二電流反饋電阻242、243反饋至該反 饋電流同相輸入端266，該第二分壓電阻241連接該輸出 端28 —端的電壓藉由該第三、第四電流反饋電阻244、 245反饋至該反饋電流反相輸入端267。該反饋電流同相 輸入端266電壓小於該反饋電流反相輸入端267電壓，該 096113952 表單編號A0101 第11頁/共25頁 0993275208-0 1335707 099年07月30 B後正替換頁 脈衝電壓輸出端265輸出電壓的脈衝寬度增大，該雙極電 晶體22導通時間增長，該輸出端28輸出電流增大。當該 輸出電流增大至一預設值時，該輸出端28輸出恆定電流 ，即該電池實現恆流充電。該預設電流值I可通過以下式 子得到： [0024]1335707 Replacement page on July 30, 2010. VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to a universal serial bus charging circuit and a television power supply circuit using the same. [Previous Technology] [0002] With the development of electronic technology, consumer electronic products such as digital cameras, mobile phones, and personal digital assistants (PDAs) are increasingly used, and batteries, especially rechargeable batteries, It provides a stable operating voltage and is an important part of consumer electronics. However, due to the increasing function of consumer electronic products, the power consumption per unit time is gradually increasing, and the number of battery charging is gradually increasing, and the use of battery chargers is becoming more and more frequent. At the same time, as the memory capacity of consumer electronics continues to increase, the Universal Serial Bus (USB) is used as a medium for data exchange between consumer electronics and personal computers. Since different electronic products have their own chargers and a universal serial bus, the number of people carrying chargers and universal serial buses in their lives (especially during travel) is increasing, which brings a lot of inconvenience to life. In order to solve the above problems, the functions of data exchange and battery charging are currently commonly implemented using a universal serial bus. Please refer to FIG. 1, which is a schematic diagram of a prior art ‘personal computer universal serial bus interface. The universal serial bus: the interface 10 includes first, second, third and fourth connectors 11 , 12 , 13 , 14 arranged in a horizontal order, wherein the second connector 12 transmits data for the universal serial bus Positive connector, the third connector 13 is the general 096113952 Form No. A0101 Page 4 / Total 25 Page 0993275208-0 1335707 [0004] [0005] [0006] [0007] 096113952 Correction replacement page on July 30, 099 The serial bus transmits the negative connector of the data, and the consumer electronic product realizes the data exchange function with the personal computer through the second and third connectors 12 and 13. The first connector 11 is a power terminal, the fourth connector 14 is grounded, and the first and fourth connectors 11 and 14 are respectively electrically connected to the corresponding power terminal and the ground terminal of the universal serial bus, and the personal computer provides A stable DC voltage (typically 5V) is applied to the first connector 11 of the universal serial bus interface 10, and the DC voltage charges the battery through the universal serial bus. However, since the voltage of the first connector of the universal serial bus interface 10 of the personal computer is a constant value, charging the battery using the universal serial bus interface 10 is a constant voltage charging process. At the beginning of constant voltage charging, a large instantaneous charging current is generated, which easily damages the battery and shortens the life of the rechargeable battery. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a universal serial bus charging circuit that can reduce the instantaneous charging current when the battery starts charging. It is also necessary to provide a television power supply circuit using the above-described universal serial bus charging circuit. A universal serial bus charging circuit comprising: an input terminal; a bipolar transistor; a rectifying and filtering inductor; a current feedback circuit; a voltage feedback circuit; a pulse width modulation circuit; and an output terminal; The bipolar transistor emitter is electrically connected to the input end, and the collector thereof is sequentially connected to the output end through the rectifying and filtering inductor, and the pulse width modulation circuit provides a constant reference voltage, the voltage The feedback circuit is electrically connected between the output terminal and the ground, and the current feedback circuit replaces the page flow filter according to the flow through the whole form number Α0101, page 5/25 pages, 0993275208-0 1335707 ___· 099, July 30 The current of the inductor outputs a feedback voltage to the pulse width modulation circuit, and the voltage feedback circuit outputs a feedback voltage to the pulse width modulation circuit according to the voltage of the output terminal, and the pulse width modulation circuit is configured according to the voltage feedback circuit The magnitude of the voltage of the feedback voltage and the reference voltage is determined by the current feedback of the current feedback circuit or the voltage feedback of the voltage feedback circuit to adjust the pulse width modulation circuit to be loaded in the The pulse voltage on the base of the polar transistor' When the feedback voltage of the voltage feedback circuit is less than the reference voltage, the current feedback of the pulse modulation circuit controls and increases to the base of the bipolar transistor according to the current feedback. Pulse voltage width, when the feedback voltage of the voltage feedback circuit is greater than or equal to the constant reference voltage, the voltage feedback of the pulse modulation circuit plays a control role [0008] is a television power supply circuit, which includes an AC/DC conversion circuit, A universal serial bus charging circuit and a universal serial bus interface, the universal serial bus charging circuit comprises a bipolar transistor, a rectifying filter inductor, a current feedback circuit, a voltage feedback circuit and a pulse width modulation The pulse width modulation circuit provides a constant reference voltage, the AC/DC conversion circuit converts the high frequency alternating current into a direct current, and the converted direct current voltage is applied to the emitter of the bipolar transistor, and sequentially passes through the pair a collector of the polar crystal, the rectifying filter inductor, and the current feedback circuit output to the universal serial bus interface, the voltage feedback The circuit outputs the voltage outputted from the output terminal to the pulse width modulation circuit, and the current feedback circuit outputs a feedback voltage to the pulse width modulation circuit according to the magnitude of the current flowing through the rectifying filter 3 wave inductor, wherein: the pulse width The modulation circuit determines whether the current feedback of the current feedback circuit or the voltage feedback of the voltage feedback circuit adjusts the pulse width modulation circuit according to the feedback voltage of the voltage feedback circuit and the voltage of the reference voltage. 096113952 Form No. A0101 Page 6 of 25 Page 0993275208-0 1335707 Revised on July 30, 099, the replacement page is pulsed on the base of the bipolar transistor, thereby adjusting the voltage applied to the universal serial bus interface when the voltage is fed back. When the feedback voltage of the circuit is less than the reference voltage, the current feedback of the pulse modulation circuit controls and increases the pulse voltage width applied to the base of the bipolar transistor according to the current feedback. When the feedback voltage of the voltage feedback circuit is greater than When the constant reference voltage is equal to or equal to, the voltage feedback of the pulse modulation circuit plays a controlling role. Compared with the prior art, when the universal serial bus charging circuit of the present invention starts charging, the current feedback plays a control role, the charging current gradually increases to a predetermined current value, and the constant current is charged with the predetermined current. After the battery is continuously charged to a predetermined voltage, the electric dust feedback plays a control role, and the pass U+: uses a serial bus charging circuit to perform the pre-charge; and performs constant voltage charging. Since the charging current is gradually increased when charging is started, a large instantaneous charging current is not generated, and the battery is not damaged by a large instantaneous charging current at the start of charging. Moreover, since the battery is first subjected to constant current charging and then subjected to constant voltage charging, the battery charging is more sufficient to increase the life of the battery. The television power supply circuit adopting the universal serial bus charging circuit controls the voltage loaded on the universal serial bus interface through the universal serial bus charging circuit, and the television power supply circuit has the function of constant current constant voltage charging, the battery It will not be damaged by the large instantaneous charging current at the beginning of charging, and the TV power circuit can fully charge the battery, which is beneficial to increase the battery life. [Embodiment] [0010] Please refer to FIG. 2, which is a schematic diagram of a universal serial bus charging circuit of the present invention. The universal serial bus charging circuit 20 includes an input terminal 21, a bipolar transistor 096113952, a form number A0101, a page 7 of 25 pages 0993275208-0 1335707, and a reversing filter 22, a rectification filter The inductor 23, a current feedback circuit 24, a voltage feedback circuit 25, a pulse width modulation circuit 26, a charge indicating circuit 27, an output terminal 28, first and second diodes 291, 293, a first The bias resistor 295, a second bias resistor 297 and a first voltage divider resistor 299 [0011] The output terminal 28 is electrically connected to a power connector (not shown) of a universal serial bus interface. [0012] The charge indicating circuit 27 includes a current limiting resistor 271 and a light emitting diode 273. The negative electrode of the light-emitting diode 273 is grounded, and the positive electrode is electrically connected to the end of the current limiting resistor 271. [0013] The voltage feedback circuit 25 includes first, second, and third voltage feedback resistors 251, 253, 255 connected in series between the output terminal 28 and ground. The resistance values of the first and third voltage feedback resistors 251 and 255 are 6k q and 10k q, respectively. The second voltage feedback resistor 253 is a variable resistor having a total resistance value of lkQ, which can be used to adjust the feedback voltage across the third voltage feedback resistor 255. [0014] The current feedback circuit 24 includes a second voltage dividing resistor 241 and first, second, third, and fourth current feedback resistors 242, 243, 244, and 245. The resistance of the second voltage dividing resistor 241 is 200, and the resistance values of the first, second, third, and fourth current feedback resistors 242, 243, 244, and 245 are 590 D, 20 kg, 590q, and 20 kQ, respectively. One end of the first voltage dividing resistor 241 is electrically connected to the collector of the bipolar transistor 22 through the rectifying filter inductor 23, and the other end thereof is electrically connected to the output terminal 28. The first current feedback resistor 096113952 Form No. A0101 Page 8 / Total 25 Page 0993275208-0 1335707 The correction of the 242-end by the first partial voltage 24 is electrically connected to the wheel end 28, The other end is grounded by the second current feedback resistor 243. [0015] The 腋 wide modulation circuit 26 includes a feedback voltage non-inverting input terminal 261, a feedback voltage inverting input terminal 262, a constant voltage output terminal 263, a power input terminal 264, a pulse voltage output terminal 265, and a The feedback current is coupled to the in-phase input terminal 266 and a feedback current inverting input terminal 267. The feedback voltage non-inverting input terminal 261 is grounded via the third voltage feedback resistor 255, and the feedback voltage inverting wheel terminal 262 is electrically connected to the other end of the current limiting resistor 271 via the first voltage dividing resistor 299. The constant voltage output terminal 263 is also electrically connected to the other end of the current limiting resistor 271 while the feedback current inverting input terminal 267 is electrically connected by the fourth current feedback resistor 245. The power input terminal 264 is electrically coupled to the input terminal 21, and the pulse voltage input terminal is electrically coupled to the base of the bipolar transistor 22 by the second bias resistor 297. The feedback current non-inverting input terminal 266 is grounded via the second current feedback resistor 243, and the feedback current inverting input terminal 267 is electrically coupled to the output terminal 28 via the third current inverting resistor 244. [0016] The bipolar transistor 22 is a PNP type double and 1 electric body, and its emitter is electrically connected to the input end 21'. The emitter is electrically connected to the bipolar by the first bias resistor 295. The base of the transistor 22. The first bias resistor 295 provides a base bias voltage to the bipolar transistor 22 that causes the bipolar transistor 22 to be in a switching state. [0017] The first diode 291 is positively grounded, and the negative electrode is electrically connected to the input terminal. When the voltage of the input terminal 21 is inverted, the first diode 291 is used to protect the universal serial bus charging circuit 20 . The second diode 293 is a freewheeling body, the anode of which is grounded, and the anode is electrically connected to the 096113952 of the bipolar transistor 22. Form No. A0101 Page 9 / Total 25 Page 0993275208-0 1335707 July 30, 2017 The kernel is replacing the page set. [0018] The pulse width modulation circuit 26 has a function of current feedback and voltage feedback, and at the same time, one of the feedbacks serves as a control. The principle of the voltage feedback of the pulse width modulation circuit 26 is that the feedback voltage inverting input terminal 262 provides a reference voltage. When the voltage of the feedback voltage non-inverting input terminal 261 is greater than the reference voltage, the pulse voltage output terminal 265 The pulse width of the output voltage becomes smaller; when the voltage of the feedback voltage non-inverting input terminal 261 is less than the reference voltage, the pulse width of the output voltage of the pulse voltage output terminal 265 increases; when the voltage of the feedback voltage non-inverting input terminal 261 is equal to the At the reference voltage, the pulse width of the output voltage of the pulse voltage output terminal 265 does not change. [0019] The principle of the current feedback of the pulse width modulation circuit 26 is: when the voltage of the feedback current non-inverting input terminal 266 is greater than the voltage of the feedback current inverting input terminal 267, the pulse voltage output terminal 265 outputs a voltage. The pulse width becomes smaller: when the voltage of the feedback current non-inverting input terminal 266 is less than the voltage of the feedback current inverting input terminal 267, the pulse width of the output voltage of the pulse voltage output terminal 265 increases; when the feedback current is non-inverting input terminal 266 When the voltage is equal to the voltage of the feedback current inverting input terminal 267, the pulse width of the output voltage of the pulse voltage output terminal 265 does not change. [0020] when the feedback voltage across the third voltage feedback resistor 255 (ie, the voltage of the feedback voltage non-inverting input terminal 261) is greater than or equal to the reference voltage of the feedback voltage inverting input terminal 262, the pulse width modulation The voltage feedback of the circuit 26 plays a controlling role; when the feedback voltage across the third voltage feedback resistor 255 is less than the reference voltage of the feedback voltage inverting input terminal 262, the current feedback of the pulse width modulation circuit 26 controls . The above-mentioned voltage feedback and current feedback control conversion process is completed by the internal circuit of the pulse width modulation circuit 26 096113952 Form No. A0101 Page 10 / Total 25 Page 0993275208-0 1335707 | 099_ 请日纽_Page [0021] Battery When charging, the universal serial bus charging circuit 20 operates as follows: [0022] When the battery to be charged is electrically connected to the output terminal 28 for charging, the input terminal 21 provides a stable DC voltage (the DC voltage The range is 16 V to 25 V, typically 19 V), and the DC voltage is applied to the power input 264 of the pulse width modulation circuit 26, and the pulse width modulation circuit 26 begins to operate and is at the constant voltage output 263. A stable 5V voltage is output, and the 5V voltage is applied to the two ends of the charging indicating circuit 27, and a current flows through the LED 273 to cause the LED 273 to emit light, thereby indicating that the universal serial bus charging circuit 20 starts. Charging. The constant voltage output is outputted by the 5V voltage of the 263, and the reference voltage is supplied to the feedback: voltage inverting input terminal 262 by the first voltage dividing resistor 299. (If the output terminal 28 outputs a stable 5V voltage, the reference voltage is Usually 3. 3V). [0023] The voltage outputted by the output terminal 28 is fed back to the skin-to-phase non-inverting input terminal 261 of the pulse width modulation circuit 26 by the voltage across the third voltage feedback resistor 25. The feedback voltage is less than the feedback. The reference voltage of the voltage inverting input terminal 262, the current feedback of the pulse width modulation circuit 26 controls. The output current of the output terminal 28 generates a voltage drop across the second voltage dividing resistor 241, wherein the second voltage dividing resistor 241 is connected to the voltage of the rectifier filter inductor 23 at the terminal end by the first and second current feedback. The resistors 242 and 243 are fed back to the feedback current non-inverting input terminal 266. The voltage of the second voltage dividing resistor 241 connected to the output terminal 28 is fed back to the feedback current by the third and fourth current feedback resistors 244 and 245. Input 267. The feedback current non-inverting input 266 voltage is less than the feedback current inverting input 267 voltage, the 096113952 form number A0101 page 11 / total 25 page 0993275208-0 1335707 099 July 30 B after the replacement page pulse voltage output 265 The pulse width of the output voltage is increased, the on-time of the bipolar transistor 22 is increased, and the output current of the output terminal 28 is increased. When the output current increases to a predetermined value, the output terminal 28 outputs a constant current, i.e., the battery achieves constant current charging. The preset current value I can be obtained by the following equation: [0024]
木 R1 [0025] 其中，為該輸出端28之輸出電壓值（該電壓通常為5V)， R、Rl、R2分別為該第二分壓電阻241、該第一電流反饋 電阻242、該第二電流反饋電阻243的電阻值。 [0026] 該電池進行恆流充電，該電池兩端的電壓逐漸升高，即 該輸出端28輸出之電壓逐漸升高。當該輸出端28輸出的 電壓達到一預定電壓值時，該第三電壓反饋電阻255兩端 之反饋電壓等於該反饋電壓反相輸入端262之基準電壓， 該脈寬調變電路26之電壓反饋開始起控制作用。該預定 電壓值.可通過以下式子得到： [0027] [0028] 其中，為輸出端28之輸出電壓（值該電壓通常為5V)， R3、R4、R5分別為該第一、第二、第三電壓反饋電阻 251、253、255的電阻值。 [0029]Wood R1 [0025] wherein, the output voltage value of the output terminal 28 (the voltage is usually 5V), R, R1, R2 are the second voltage dividing resistor 241, the first current feedback resistor 242, the second The resistance value of the current feedback resistor 243. [0026] The battery is subjected to constant current charging, and the voltage across the battery is gradually increased, that is, the voltage outputted from the output terminal 28 is gradually increased. When the voltage outputted by the output terminal 28 reaches a predetermined voltage value, the feedback voltage across the third voltage feedback resistor 255 is equal to the reference voltage of the feedback voltage inverting input terminal 262, and the voltage of the pulse width modulation circuit 26 Feedback begins to take control. The predetermined voltage value can be obtained by the following equation: [0028] where is the output voltage of the output terminal 28 (the value is usually 5V), and R3, R4, and R5 are the first and second, respectively. The resistance value of the third voltage feedback resistors 251, 253, 255. [0029]
該反饋電壓同相輸入端261之電壓（即該第三電壓反饋電 096113952 表單編號Α0101 第12頁/共25頁 0993275208-0 1335707 - 099年07月30日梭正替換頁 一 阻255兩端之反饋電壓）等於該基準電壓，該脈衝電壓輸 - 出端265輸出電壓的脈衝寬度不變，該輸出端28輸出電壓 不變，該電池實現恆壓充電。 [0030] 與先前技術相比，本發明通用串行總線充電電路20在開 始充電時，充電電流逐漸增大到一預定電流值，並以該 預定電流進行恆流充電，當該電池恆流充電到一預定電 壓後，又以該預定電壓進行恆壓充電。由於開始充電時 ，該充電電流逐漸增大，因此不會產生大的瞬間充電電 流，該電池不會因充電開始時大的瞬間充電電流而損壞 。同時，由於該電池先進行恆流充電，再進行恆壓充電 ，該電池充電更加充分，提高了荈電奏每次充電後的使 用時間，在充電電池可充電次數一定的廣況下，提高了 該電池的壽命。 [0031] 請參閱圖3，係一種採用圖2所示通用串行總線充電電路 的電視電源電路示意圖。該電視電源電路30包括一交直 流轉換電路31、一逆變器33、一通用串行總線充電電路 20及一通用串行總線介面37。該交:直流轉換電路31包括 一第一、第二電壓輸出端313、315。 [0032] 高頻交流電壓輸入該交直流轉換電路31，經該交直流轉 換電路31轉換後，由該第一電壓輸出端313提供一第一直 流電壓至該逆變器33。當充電電池電連接到該通用串行 ' 總線介面37並開始充電時，該交直流轉換電路31由該第 二電壓輸出端31 5提供一第二直流電壓，該第二直流電壓 加載到該通用串行總線充電電路20以使該通用串行總線 充電電路20開始工作，該通用串行總線充電電路20提供 096113952 表單編號A0101 第13頁/共25頁 0993275208-0 1335707 099年07月30日後正替換頁 充電電壓至該通用串行總線介面3 7，使該通用串行總線 介面37對該電池先進行恆流充電，再進恆壓充電。 [0033] 與先前技術相比，本發明的電視電源電路30包括一通用 串行總線充電電路2 0及一通用串行總線介面3 7，當充電 電池電連接到該電視電源電路3 0的通用串行總線介面3 7 時，該通用串行總線充電電路20控制該通用串行總線介 面37對該電池先進行恆流充電，再進恆壓充電，從而使 該電視電源電路30具有恆流恆壓充電功能。同時，由於 電視機的價格相對個人電腦便宜，且電視在普通家庭中 已得到廣泛的普及，因此將該通用串行總線充電電路20 及該通用串行總線介面37設置於電視機的電源電路上， 並通過該通用串行總線介面37對電池充電，會給使用該 通用串行總線介面37進行電池充電的使用者提供極大的 方便。 [0034] 綜上所述，本發明確已符合發明之要件，爰依法提出專 利申請。惟，以上該者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟習本案技 藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 [0035] 圖1係一種先前技術個人電腦之通用串行總線介面之截面 示意圖。 [0036] 圖2係本發明通用串行總線充電電路示意圖。 [0037] 圖3係一種採用圖2通用串行總線充電電路的電視電源電 096113952 表單編號A0101 第14頁/共25頁 0993275208-0 1335707 099年07月30日修正替換頁 路示意圖。 【主要元件符號說明】 [0038] 通用串行總線充電電路：2 0 [0039] 輸入端：21 [0040] 雙極電晶體：22 [0041] 整流濾波電感：23 [0042] 電流反饋電路：24 [0043] 第二分壓電阻：241 [0044] 第一電流反饋電阻： 242 [0045] 第二電流反饋電阻： 243 [0046] 第三電流反饋電阻： 244 [0047] 第四電流反饋電阻： 245 [0048] 電壓反饋電路：25 [0049] 第一電壓反饋電阻： 251 [0050] 第二電壓反饋電阻： 253 [0051] 第三電壓反饋電阻： 255 [0052] 脈寬調變電路：26 [0053] 反饋電壓同相輸入端 ：261 [0054] 反饋電壓反相輸入端 ：262 [0055] 恆定電壓輸出端：263 表單編號A0101 第15頁/共25頁 096113952 0993275208-0 1335707 099年07月30日梭正替換頁 [0056] 電源輸入端：264 [0057] 脈衝電壓輸出端：265 [0058] 反饋電流同相輸入端：266 [0059] 反饋電流反相輸入：267 [0060] 充電指示電路：27 [0061] 限流電阻：271 [0062] 發光二極體：273 [0063] 輸出端：28 [0064] 第一二極體：291 [0065}第二二極體：293 [0066] 第一偏置電阻：295 [0067] 第二偏置電阻：297 [0068] 第一分壓電阻：299 [0069] 電視電源電路：30 [0070] 交直流轉換電路：31 [0071] 第一電壓輸出端：313 [0072] 第二電壓輸出端：315 [0073] 逆變器：3 3 [0074] 通用串行總線介面：37 096113952 表單編號A0101 第16頁/共25頁 0993275208-0The feedback voltage is the voltage of the non-inverting input terminal 261 (ie, the third voltage feedback power 096113952 form number Α0101 page 12 / total 25 page 0993275208-0 1335707 - 0799 July 30th shuttle replacement page one resistance 255 end feedback The voltage is equal to the reference voltage, the pulse width of the output voltage of the pulse voltage output terminal 265 is constant, the output voltage of the output terminal 28 is constant, and the battery realizes constant voltage charging. [0030] Compared with the prior art, the universal serial bus charging circuit 20 of the present invention gradually increases the charging current to a predetermined current value when starting charging, and performs constant current charging with the predetermined current when the battery is constant current charged. After a predetermined voltage, constant voltage charging is performed at the predetermined voltage. Since the charging current is gradually increased at the start of charging, a large instantaneous charging current is not generated, and the battery is not damaged by a large instantaneous charging current at the start of charging. At the same time, since the battery is first subjected to constant current charging and then subjected to constant voltage charging, the battery is more fully charged, and the use time of the cymbal after each charging is improved, and the charging time of the rechargeable battery is increased under a certain degree. The life of the battery. [0031] Please refer to FIG. 3, which is a schematic diagram of a television power supply circuit using the universal serial bus charging circuit shown in FIG. 2. The television power supply circuit 30 includes an AC/DC converter circuit 31, an inverter 33, a universal serial bus charging circuit 20, and a universal serial bus interface 37. The intersection: DC conversion circuit 31 includes a first and second voltage output terminals 313, 315. [0032] The high-frequency AC voltage is input to the AC-DC conversion circuit 31, and after the AC-DC conversion circuit 31 is converted, a first DC voltage is supplied from the first voltage output terminal 313 to the inverter 33. When the rechargeable battery is electrically connected to the universal serial 'bus interface 37 and begins to charge, the AC/DC converting circuit 31 provides a second DC voltage from the second voltage output terminal 3 5, and the second DC voltage is applied to the universal Serial bus charging circuit 20 to start operation of the universal serial bus charging circuit 20, the universal serial bus charging circuit 20 provides 096113952 Form No. A0101 Page 13 / Total 25 Page 0993275208-0 1335707 After July 30, 2003 The page charging voltage is replaced by the universal serial bus interface 307, so that the universal serial bus interface 37 first charges the battery with constant current and then performs constant voltage charging. [0033] Compared with the prior art, the television power supply circuit 30 of the present invention includes a universal serial bus charging circuit 20 and a universal serial bus interface 373, and is commonly used when the rechargeable battery is electrically connected to the television power supply circuit 30. When the serial bus interface is 3 7 , the universal serial bus charging circuit 20 controls the universal serial bus interface 37 to perform constant current charging on the battery, and then enters constant voltage charging, so that the television power supply circuit 30 has a constant current constant. Pressure charging function. Meanwhile, since the price of the television is cheaper than that of the personal computer, and the television has been widely spread in the ordinary home, the universal serial bus charging circuit 20 and the universal serial bus interface 37 are disposed on the power supply circuit of the television. Charging the battery through the universal serial bus interface 37 provides great convenience to the user who uses the universal serial bus interface 37 for battery charging. [0034] In summary, the present invention has indeed met the requirements of the invention, and the patent application is filed according to law. However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It is covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0035] FIG. 1 is a schematic cross-sectional view of a universal serial bus interface of a prior art personal computer. 2 is a schematic diagram of a universal serial bus charging circuit of the present invention. 3 is a television power supply using the universal serial bus charging circuit of FIG. 2 096113952 Form No. A0101 Page 14 of 25 0993275208-0 1335707 Revised replacement page schematic on July 30, 099. [Main component symbol description] [0038] Universal serial bus charging circuit: 2 0 [0039] Input: 21 [0040] Bipolar transistor: 22 [0041] Rectifier filter inductor: 23 [0042] Current feedback circuit: 24 [0043] Second voltage dividing resistor: 241 [0044] First current feedback resistor: 242 [0045] Second current feedback resistor: 243 [0046] Third current feedback resistor: 244 [0047] Fourth current feedback resistor: 245 [0048] Voltage feedback circuit: 25 [0049] First voltage feedback resistor: 251 [0050] Second voltage feedback resistor: 253 [0051] Third voltage feedback resistor: 255 [0052] Pulse width modulation circuit: 26 [ 0053] Feedback voltage non-inverting input: 261 [0054] Feedback voltage inverting input: 262 [0055] Constant voltage output: 263 Form No. A0101 Page 15 of 25 096113952 0993275208-0 1335707 July 30, 2017 Shuttle Positive Replacement Page [0056] Power Input: 264 [0057] Pulse Voltage Output: 265 [0058] Feedback Current Non-inverting Input: 266 [0059] Feedback Current Inverting Input: 267 [0060] Charging Indication Circuit: 27 [ 0061] Current limiting resistor: 271 [006] 2] Light Emitting Diode: 273 [0063] Output: 28 [0064] First Diode: 291 [0065] Second Diode: 293 [0066] First Bias Resistor: 295 [0067] Second Bias resistor: 297 [0068] First voltage divider resistor: 299 [0069] TV power supply circuit: 30 [0070] AC/DC converter circuit: 31 [0071] First voltage output terminal: 313 [0072] Second voltage output terminal :315 [0073] Inverter: 3 3 [0074] Universal Serial Bus Interface: 37 096113952 Form No. A0101 Page 16 of 25 0993275208-0