WO2011029334A1 - 一种移动终端供电单元及移动终端供电切换方法 - Google Patents

一种移动终端供电单元及移动终端供电切换方法 Download PDF

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Publication number
WO2011029334A1
WO2011029334A1 PCT/CN2010/074500 CN2010074500W WO2011029334A1 WO 2011029334 A1 WO2011029334 A1 WO 2011029334A1 CN 2010074500 W CN2010074500 W CN 2010074500W WO 2011029334 A1 WO2011029334 A1 WO 2011029334A1
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Prior art keywords
power supply
mobile terminal
power
module
battery
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PCT/CN2010/074500
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English (en)
French (fr)
Inventor
苏海波
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惠州Tcl移动通信有限公司
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Application filed by 惠州Tcl移动通信有限公司 filed Critical 惠州Tcl移动通信有限公司
Priority to ES10814936.0T priority Critical patent/ES2551231T3/es
Priority to US13/203,954 priority patent/US8649827B2/en
Priority to EP10814936.0A priority patent/EP2477306B1/en
Publication of WO2011029334A1 publication Critical patent/WO2011029334A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present invention relates to the field of electronic technologies, and in particular, to a power supply unit for a mobile terminal and a power supply switching method for the mobile terminal.
  • the traditional mobile phone In today's social life, mobile phones have become an indispensable communication tool in people's lives, which brings great convenience to people's lives.
  • the traditional mobile phone generally supplies power to the mobile phone by the battery.
  • the mobile phone battery supplies power to the mobile phone while charging, thereby shortening the service life of the battery and increasing the peripheral cost of the mobile phone. It does not meet the requirements of the "China Mobile TD Family Mobile Phone Specification".
  • the terminal In the case of external power supply, the terminal uses the power supply, and the battery only charges and does not supply power to the terminal.
  • An object of the present invention is to provide a power supply unit for a mobile terminal and a power supply switching method for the mobile terminal.
  • the terminal When the external power supply of the terminal is charged, the terminal can be powered by the power source, and the battery is only charged without powering the terminal.
  • a power supply unit for a mobile terminal comprising a battery, further comprising: a power conversion module, a charging management module, and a power switching module; the charging management module and the power conversion module each include a power input port for connecting an external power supply
  • the charging management module is connected to the battery, and is configured to charge the battery when the external power source is connected;
  • the power conversion module is connected to the power switching module, and is configured to convert the external power supply voltage into a power supply voltage required by the mobile terminal.
  • controlling the on/off state of the power switching module so that the power switching module is in an on state when no external power source is connected, the battery supplies power to the mobile terminal, and when the external power source is connected, the power switching module is disconnected
  • the power conversion module outputs a supply voltage.
  • the mobile terminal power supply unit further includes a system power supply module connected to the output end of the power conversion module for charging and storing energy in a gap of the radio frequency of the mobile terminal, and at the mobile terminal Discharge when radio frequency is emitted.
  • the mobile terminal power supply unit wherein the power conversion module includes: an integrated chip of the type POWER-DC20C-TPS62040DRC, configured to convert an external power supply voltage into a power supply voltage required by the mobile terminal;
  • the power supply switching unit of the mobile terminal wherein the power switching module includes: a second resistor, a third resistor, and a field effect transistor; the second resistor and the third resistor are connected in series to form a voltage sampling circuit, and the third resistor One end is connected to the power conversion module, and a voltage dividing point of the voltage sampling circuit is connected to a gate of the FET, and a source of the FET is connected to the battery.
  • the mobile terminal power supply unit wherein a sum of resistances of the second resistor and the third resistor is 1.2 K ⁇ to 1.5 K ⁇ .
  • the mobile terminal power supply unit wherein the system power supply module includes a first capacitor and a second capacitor connected in parallel.
  • the mobile terminal power supply unit wherein the first capacitor and the second capacitor are tantalum capacitors.
  • a mobile terminal power supply switching method implemented by a mobile terminal power supply unit comprising the following steps:
  • step B Detect whether an external power source is connected to the mobile terminal; if yes, perform step B; otherwise, the battery is powered by the battery;
  • step B comprises:
  • the invention provides a power supply unit for a mobile terminal and a power supply switching method for the mobile terminal, which adopts a power conversion module to convert an external power supply voltage into a power supply voltage required by the terminal, and the power switching module switches a power supply mode between the battery and the power conversion module.
  • the terminal has external power supply access, the terminal is powered by an external power supply, and the battery is only charged without powering the terminal, which satisfies the requirements of the "China Mobile TD Family Mobile Phone Specification", and is also suitable for power supply switching of the 3G mobile phone.
  • FIG. 1 is a block diagram of a power supply unit of a mobile terminal of the present invention
  • FIG. 2 is a circuit diagram of an embodiment of a power supply unit of a mobile terminal according to the present invention.
  • FIG. 3 is a flow chart of a method for switching power supply of a mobile terminal according to the present invention.
  • the terminal uses the power supply, and the battery only charges and does not supply power to the terminal.
  • the present invention provides a power supply unit for a mobile terminal, as shown in FIG. 1 and FIG. 2, including:
  • the battery 150 is used to supply power to the mobile terminal.
  • the charging management module 120 and the power conversion module 110 each include a power input port for connecting an external power source (a 5V DC power source input through a charger or a computer USB interface).
  • the charging management module 120 is connected to the battery 150 for charging the battery 150 when the mobile terminal accesses an external power source.
  • the power conversion module 110 is connected to the power switching module 130 for converting an external power supply voltage into a power supply voltage required by the mobile terminal, and controlling an on/off state of the power switching module 130.
  • the power conversion module 110 places the power switching module 130 in an on state, and the battery is powered by the mobile terminal, and when the external power source accesses the mobile terminal, the power conversion module 110 The power switching module 130 is turned off, and the power conversion voltage is output by the power conversion module.
  • the power conversion module 110 includes an integrated chip U1202 for converting an external power supply voltage into a power supply voltage required by the mobile terminal.
  • the model of the chip U1202 is a POWER-DC20C-TPS62040DRC.
  • the 5V DC power supply voltage is input from the first, second, third, fourth and sixth pin terminals of the chip U1202.
  • the chip U1202 converts the 5V DC voltage into the 4.2V voltage required for the mobile terminal power supply, and then the fifth chip from the U1202 chip. , 7 and 8 pin output.
  • the first pin of the chip U1202 is connected in series with the first resistor R1214, and then connected to the power input port.
  • the input terminals of the fourth pin and the sixth pin of the chip are connected to the first filter circuit 160, and then to the power input port. Connected, the second and third pins of the chip are directly connected to the power input port.
  • the fifth pin of the chip is connected to a voltage dividing point of the first voltage sampling circuit 190. One end of the first voltage sampling circuit is connected to the output port of the power supply unit of the mobile terminal, and the other end is grounded.
  • the 9th, 10th, and 11th pins of the chip U1202 are grounded, the 7th pin of the chip U1202 is connected to the 8th pin of the chip, and the output end of the 8th pin of the chip is connected in series with an inductor L1201 and then supplied with the mobile terminal.
  • the output port of the unit is connected.
  • a second filter 170 is also coupled to the output of the power conversion module 110.
  • the signal output of the second filter circuit 170 is connected to the output port of the mobile terminal power supply unit through the first diode D7.
  • the first filter circuit 160 and the second filter circuit 170 are formed by at least two capacitors in parallel.
  • the first filter circuit 160 and the second filter are provided.
  • four capacitors can be used in parallel.
  • the first voltage sampling circuit 190 is composed of at least two resistors in series.
  • the power supply unit of the mobile terminal provided by the present invention has no limitation on the number of resistors connected in series. For example, three resistors may be connected in series and then connected in series with the fourth resistor R1215.
  • the connection point is a voltage dividing point. When the external power input voltage is 5V, the voltage output from the voltage dividing point of the first voltage sampling circuit 190 is 4.2V, that is, the voltage at the output end of the chip U1202 is 4.2V.
  • the power switching module 130 includes a second resistor R30, a third resistor R15, and a field effect transistor Q202.
  • the second resistor R30 and the third resistor R15 are connected in series to form a second voltage sampling circuit 191.
  • One end of the third resistor is connected to the power conversion module 110, and a voltage dividing point of the second voltage sampling circuit 191 is connected to a gate of the field effect Q202 tube, a source of the FET and the The battery is connected and the drain of the FET is grounded.
  • the field effect transistor Q202 is a P-channel field effect transistor, the model number is: PDN304P, and the VGS switching threshold of the field effect transistor is -0.8V or more.
  • the FET Q202 mainly functions as a switch. When no external power source is connected to the mobile terminal, the power conversion module outputs a low level, and the FET is placed in an on state. The terminal is powered by the battery, and when the mobile terminal has an external power supply, the power conversion module outputs a high level, and the FET is in an off state, and the mobile terminal is powered by an external power supply.
  • the sum of the resistances of the second resistor and the third resistor is 1.2K ⁇ to 1.5. K ⁇ .
  • the resistance of the second resistor R15 is 1.2K ⁇
  • the resistance of the third R30 is 200 ⁇ , so that the power switching module 130 smoothly switches the power supply mode while ensuring the second resistor R15 (the gate of the Q202). Divided into a voltage of 3.6V.
  • the power supply unit of the mobile terminal further includes a system power supply module.
  • the system power supply module 140 is connected to the output end of the power conversion module 110 for charging and storing energy in the gap emitted by the mobile terminal, and discharging the mobile terminal when the mobile terminal transmits the radio frequency.
  • the system power supply module 140 includes a first capacitor C33 and a second capacitor C1555 connected in parallel.
  • the positive ends of the first capacitor C33 and the second capacitor C1555 are connected to the output port of the mobile terminal power supply unit, and the negative terminals of the first capacitor C33 and the second capacitor C1555 are grounded.
  • the instantaneous peak current of the transmission time slot will suddenly rise, and the power conversion module may have insufficient power supply.
  • the first capacitor C33 and the second capacitor C1555 may be immediately connected to the terminal. The discharge is supplemented, and the first capacitor and the second capacitor are immediately charged and stored in the time slot in which the radio frequency is not transmitted, and the power supply is prepared for the next transmission time slot.
  • the first capacitor C33 and the second capacitor C1555 both use tantalum capacitors. Because tantalum capacitors have the advantages of small size, large capacity, low leakage current and long service life. It should be noted that other capacitors having charging and discharging effects, such as ceramic capacitors or electrolytic capacitors, can also be used in the present invention.
  • the circuit of the charging management module 120 is as shown in FIG. 2 .
  • Chip U56 and third filter circuit 180 The model of the chip U56 is: S13441DV-T1, which functions as a switch in the present embodiment for controlling the battery charging signal.
  • the third filter circuit 180 is configured to filter electromagnetic interference of the battery power supply network to ensure the stability of the battery power supply system.
  • the negative terminal of the battery 150 is connected in series with the fifth resistor VR6, and then grounded.
  • the positive terminal of the battery is connected to the third filter circuit 180, and then connected to the signal output terminals of the first, second, fifth, and sixth pins of the chip U56.
  • a sixth resistor R655 is further connected in series between the third filter circuit 180 and the chip U56.
  • the third pin of the chip U56 is connected in series with the seventh resistor R656, and is connected to the power input port through the second diode D15.
  • the current is rectified by the second diode D15, and after receiving the charging signal, the chip U56 is placed in a conducting state, so that the 5V power source charges the battery through the chip U56, when the battery is When the charging capacity is saturated, the chip U56 is turned off.
  • the third filter circuit 180 is a circuit in which a plurality of capacitors and an eighth resistor VR50 are connected in parallel, wherein the number of capacitors connected in parallel may be four.
  • the power conversion module 110 when there is no external power source (a 5V power source inserted by a charger or a USB) to access the terminal, the power conversion module 110 does not operate, and therefore, the voltage output from the power conversion module 110 is a low level, and the P-channel FET The gate G of Q202 is at a low level, and the FET Q202 is turned on. At this time, the battery 150 supplies power to the terminal system through Q202.
  • a 5V power source inserted by a charger or a USB a 5V power source inserted by a charger or a USB
  • the power conversion module When a 5V external power supply (a 5V power supply inserted by a charger or a USB) is connected to the mobile terminal, the power conversion module starts working, and the chip U1202 in the power conversion module converts the voltage of 5V into a voltage of 4.2V, and passes The output port supplies power to the terminal.
  • the voltage of the power switching module is 4.2V, and then the voltage is sampled and processed by the second resistor R30 and the third resistor R15, and the power supply to the gate G of the effect transistor Q202 is 3.6V, which makes the voltage Mobile terminal at 3.3V ⁇
  • the FET Q202 is not turned on within the voltage range of 4.2V.
  • the battery stops supplying power to the terminal, but the circuit portion of the charge management module 120 is still in operation.
  • the chip U56 is placed in a conducting state, so that the 5V power source charges the battery.
  • the chip U56 is automatically turned off, and the charging management module stops working. Still powered by an external power source.
  • the power supply current of the power conversion module 110 is generally less than 1A, while the TD/GSM dual-mode mobile phone RF operates in a time division mode, and the instantaneous peak current of the transmission time slot sometimes reaches 2A or even higher, so the power conversion module may have insufficient power supply.
  • the tantalum capacitor of the system power supply module performs discharge correction on the terminal, and the tantalum capacitor immediately performs charging and energy storage in the RF transmission gap, and prepares for power supply for the next transmission time slot.
  • This satisfies the requirement that when the terminal has an external power supply, the terminal is powered by an external power supply, the battery is only charged and does not supply power to the terminal, and is also suitable for power supply switching of the 3G mobile phone.
  • the power conversion module 110 When the terminal is powered by an external power supply and the battery is only charged without powering the terminal, if the external power supply is disconnected, the power conversion module 110 will immediately stop working. In this case, the FET Q202 cannot be turned on in time, and the battery will not be immediately available to the system. Powering the power supply module means that the terminal will be powered off. Therefore, the sum of the resistance values of the second resistor R30 and the third resistor R15 is 1.2K ⁇ -1.5.
  • the capacitor storage voltage in the second filter circuit 170 in the power conversion module and the gate G junction capacitance of the FET Q202 can be quickly discharged to the ground when the external power source is disconnected, so that the field effect transistor
  • the gate G voltage of Q202 drops rapidly and reaches the state where Q202 is re-opened, so that the battery can quickly supply power to the system power supply module, realizing the battery to quickly recover the power supply to the terminal system when the charger is pulled out, and the terminal still works smoothly.
  • the present invention provides a mobile terminal power supply switching method implemented by using a mobile terminal power supply unit, as shown in FIG. 3, including the following steps:
  • the power conversion module detects whether there is an external power supply to access the mobile terminal; if yes, step 300 is performed, otherwise, step 200 is performed;
  • the battery is stopped to supply power to the mobile terminal, and the power conversion module converts the power supply mode, activates the external power supply to supply power to the mobile terminal, and charges the battery;
  • the system power supply module is activated to discharge the mobile terminal.
  • the present invention provides a power supply unit of a mobile terminal, by using a power conversion module to convert an external power supply voltage into a power supply voltage required by the terminal, and the power switching module switches the power supply mode between the battery and the power conversion module, thereby realizing that there is an external connection.
  • the terminal When the power is connected, the terminal is powered by an external power supply.
  • the battery is only charged and does not supply power to the terminal, which satisfies the requirements of the "China Mobile TD Family Mobile Phone Specification", and is also suitable for power supply switching of 3G mobile phones.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)

Description

一种移动终端供电单元及移动终端供电切换方法
技术领域
本发明涉及电子技术领域，特别涉及一种移动终端供电单元及移动终端供电切换方法。
背景技术
在当今社会生活当中，手机已经成为了人们生活中不可缺少的通信工具，它给人们的生活带来了极大的方便。传统的手机一般由电池给手机供电，当手机外接电源充电时，手机电池在充电的同时，还给手机供电，这样便减短了电池的使用寿命，使手机的外设成本增加。且不符合《中国移动TD家庭手机规范》要求，在外接电源的情况下，终端使用电源供电，电池只充电不对终端供电。
因而，现有技术还有待改进和提高。
发明内容
本发明的目的在于提供一种移动终端供电单元及移动终端供电切换方法，当终端外接电源充电时，终端能够使用电源供电，电池只充电不对终端供电。
为了达到上述目的，本发明采取了以下技术方案：
一种移动终端供电单元，包括电池，其特征在于，还包括：电源转换模块、充电管理模块、电源切换模块；所述充电管理模块和电源转换模块均包括一电源输入端口，用于连接外接电源；所述充电管理模块与电池连接，用于在外接电源接入时对电池充电；所述电源转换模块与所述电源切换模块连接，用于将外接电源电压转换成移动终端所需供电电压，以及控制所述电源切换模块的通断状态，使电源切换模块在没有外接电源接入时为导通状态，电池对移动终端供电，而在外接电源接入时，使所述电源切换模块断开，所述电源转换模块输出供电电压。
所述的移动终端供电单元，其中，还包括系统供电模块，该系统供电模块并接在所述电源转换模块的输出端，用于在移动终端射频发射的间隙进行充电储能，而在移动终端射频发射时放电。
所述的移动终端供电单元，其中，所述电源转换模块包括：型号为POWER-DC20C-TPS62040DRC的集成芯片，用于将外接电源电压转换成移动终端所需供电电压；
所述的移动终端供电单元，其中，所述电源切换模块包括：第二电阻、第三电阻和场效应管；所述第二电阻和第三电阻串联构成电压采样电路，所述第三电阻的一端与所述电源转换模块连接，所述电压采样电路的分压点连接所述场效应管的栅极，所述场效应管的源极与所述电池连接。
所述的移动终端供电单元，其中，所述第二电阻和第三电阻的阻值之和为1.2KΩ～1.5 KΩ。
所述的移动终端供电单元，其中，所述系统供电模块包括并联的第一电容和第二电容。
所述的移动终端供电单元，其中，所述第一电容和第二电容均为钽电容。
一种采用移动终端供电单元实现的移动终端供电切换方法，其中，所述方法包括以下步骤：
A、检测是否有外接电源接入移动终端；如果有，则执行步骤B，否则，由电池给移动终端供电；
B、停止电池对移动终端的供电，由外接电源给移动终端供电，并对电池充电；
所述的方法，其中，所述步骤B包括：
B1、当外接电源供电电流不足时，启动系统供电模块对移动终端进行放电补充。本发明提供一种移动终端供电单元及移动终端供电切换方法，采用了电源转换模块将外接电源电压转换成终端所需供电电压，并且电源切换模块对电池和电源转换模块之间的供电模式进行切换，实现了当终端有外接电源接入时，终端由外接电源供电，电池只充电不对终端供电，满足了《中国移动TD家庭手机规范》要求，而且还适合3G手机的供电切换。
附图说明
图1是本发明移动终端供电单元方框图；
图2是本发明移动终端供电单元实施例的电路示意图；
图3是本发明移动终端供电切换方法流程图。
具体实施方式
为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实例对本发明进一步详细说明。
根据《中国移动TD家庭手机规范》要求，在外接电源的情况下，终端使用电源供电，电池只充电不对终端供电。为了满足上述要求，本发明提供一种移动终端供电单元，如图1，图2所示，包括：
电源转换模块110、充电管理模块120、电源切换模块130、系统供电模块140和电池150。所述电池150用于给移动终端供电，所述充电管理模块120和电源转换模块110均包括一电源输入端口，用于连接外接电源（通过充电器或者电脑USB接口输入的5V直流电源）。所述充电管理模块120与所述电池150连接，用于在移动终端接入外接电源时对电池150充电。所述电源转换模块110与所述电源切换模块130连接，用于将外接电源电压转换成移动终端所需的供电电压，以及控制所述电源切换模块130的通断状态。在没有外接电源接入移动终端时，所述电源转换模块110使电源切换模块130置于导通状态，由电池对移动终端供电，而在外接电源接入移动终端时，所述电源转换模块110使所述电源切换模块130关断，由所述电源转换模块输出供电电压。
如图2所示，所述电源转换模块110包括一集成芯片U1202，用于将外接电源电压转换为移动终端所需供电电压，芯片U1202的型号为；POWER-DC20C-TPS62040DRC。5V的直流电源电压从芯片U1202的第1、2、3、4和6引脚端输入，芯片U1202将5V的直流电压转换成移动终端供电所需的4.2V电压，然后从芯片U1202的第5、7和8引脚端输出。
所述芯片U1202的第1引脚串联第一电阻R1214，然后与电源输入端口连接，所述芯片的第4引脚和第6引脚的输入端连接第一滤波电路160，然后与电源输入端口连接，所述芯片的第2引脚和第3引脚直接与电源输入端口连接。所述芯片的第5引脚与第一电压采样电路190的分压点连接，第一电压采样电路的一端与移动终端供电单元的输出端口连接，另一端接地。芯片U1202的第9、10、11引脚接地，芯片U1202的第7引脚与芯片的第8引脚连接，并且芯片的第8引脚的输出端串联一电感L1201后与所述移动终端供电单元的输出端口连接。
在电源转换模块110的输出端还连接有第二滤波170。所述第二滤波电路170的信号输出通过第一二极管D7与移动终端供电单元的输出端口连接。
如图2所示，本实施例中，第一滤波电路160和第二滤波电路170至少由两个电容并联构成，在本发明提供的移动终端供电单元中，第一滤波电路160和第二滤波电路170的电容使用数据没有限制，比如可以采用4个电容并联。所述第一电压采样电路190至少由两个电阻串联构成，但本发明提供的移动终端供电单元，电阻串联的数量没有限制，比如，可以采用三个电阻串联后再与第四电阻R1215串联，其连接点为分压点，当外接电源输入电压为5V时，第一电压采样电路190分压点输出的电压为4.2V，即：芯片U1202输出端的电压为4.2V。
本发明提供的移动终端供电单元，如图2所示，所述电源切换模块130包括：第二电阻R30、第三电阻R15和场效应管Q202。所述第二电阻R30和第三电阻R15串联构成第二电压采样电路191。所述第三电阻的一端与所述电源转换模块110连接，所述第二电压采样电路191的分压点连接所述场效应Q202管的栅极，所述场效应管的源极与所述电池连接，场效应管的漏极接地。
本实施例中，场效应管Q202为P沟道场效应管，型号为：PDN304P，场效应管的VGS开关门限为-0.8V以上。所述场效应管Q202在本实施例中主要起切换开关作用，当没有外接电源接入移动终端时，电源转换模块输出为低电平，所述场效应管置于导通状态，此时移动终端由电池供电，而当移动终端有外接电源接入时，所述电源转换模块输出为高电平，所述场效应管处于关断状态，此时移动终端由外接电源供电。
而且，当外接电源断电的瞬间，为了使所述电源切换模块130平滑切换移动终端供电单元的供电模式，所述第二电阻和第三电阻的阻值之和为1.2KΩ～1.5 KΩ。以便保证充电器拔出时网络部分电容及Q202的栅极结电容能迅速对地放电。本实施例中，所述第二电阻R15的阻值为1.2KΩ，第三R30的阻值为200Ω，使电源切换模块130平滑切换供电模式的同时确保第二电阻R15上（Q202的栅极）分到3.6V的电压。
为了解决移动终端供电单元供电不足的问题，如图2所示，移动终端供电单元还包括系统供电模块。所述系统供电模块140并接在所述电源转换模块110的输出端，用于在移动终端发射的间隙进行充电储能，而在移动终端射频发射时对移动终端放电。
所述系统供电模块140包括并联的第一电容C33和第二电容C1555。所述第一电容C33和第二电容C1555的正极端连接移动终端供电单元的输出端口，所述第一电容C33和第二电容C1555的负极端接地。
当移动终端射频工作在时分模式，发射时隙瞬时峰值电流会突然升高，这时电源转换模块会出现供电不足的情况，此时，所述第一电容C33和第二电容C1555可以即时对终端进行放电补充，在射频不发射的时隙所述第一电容和第二电容立即进行充电储能补充，为下一次发射时隙做好供电准备。
本实施例中，第一电容C33和第二电容C1555均采用钽电容。因为钽电容具有器体积小、容量大、漏电流低、使用寿命长等优点。应当说明的是，本发明还可以采用其它具有充电和放电作用的电容，比如，陶瓷电容或者电解电容。
所述充电管理模块120的电路，如图2所示。芯片U56和第三滤波电路180。所述芯片U56的型号为：S13441DV-T1，在本实施例中起开关作用，用于对电池充电信号的控制。所述第三滤波电路180，用于滤除电池供电网络的电磁干扰，确保电池供电系统稳定。
所述电池150的负极端串联第五电阻VR6，然后接地，电池的正极端连接第三滤波电路180连接后，与芯片U56的第1、2、5、6引脚的信号输出端连接。在第三滤波电路180和芯片U56之间还串联有第六电阻R655，所述芯片U56的第3引脚串联第七电阻R656后，通过第二二极管D15与电源输入端口连接。
当有5V的外接电源接入移动终端时，电流通过第二二极管D15整流，芯片U56接收到充电信号后，置于导通状态，使5V的电源通过芯片U56对电池充电，当电池的充电电量饱和时，芯片U56关断。
本实施例中，第三滤波电路180为数个电容和第八电阻VR50并联构成的电路，其中，并联的电容数量可以为4个。
为了更好的了解本发明，以下以TD/GSM双模手机为例，对本发明的工作原理进行详细说明。
如图2，当没有外接电源（由充电器或USB插入的5V电源）接入终端时，电源转换模块110不工作，因此，电源转换模块110输出的电压为低电平，P沟道场效应管Q202的栅极G为低电平，所述场效应管Q202打开，此时，电池150通过Q202对终端系统供电。
当有5V的外接电源（由充电器或USB插入的5V电源）接入移动终端时，所述电源转换模块启动工作，电源转换模块中的芯片U1202将5V的电压转换为4.2V的电压，通过输出端口给终端供电，同时，电源切换模块的电压为4.2V，然后经过第二电阻R30、第三电阻R15电压采样处理，分到效应管Q202的栅极G的电源为3.6V，该电压使得移动终端在3.3V ~ 4.2V的电压范围内都不会把场效应管Q202打开，因此，电池停止了对终端供电，但充电管理模块120的电路部分仍然处于工作状态。具体为：当有外接电源接入移动终端时，芯片U56置于导通状态，使5V的电源给电池充电，当电池充电的电量饱和时，芯片U56自动关断，充电管理模块停止工作，终端仍然由外接电源供电。但电源转换模块110的供电电流一般都小于1A，而TD/GSM双模手机射频工作在时分模式，发射时隙瞬时峰值电流有时可达2A甚至更高，因此电源转换模块会有供电不足的问题，此时系统供电模块的钽电容对终端进行放电补正，在射频发射间隙该钽电容立即进行充电储能，为下一次发射时隙做好供电准备。这样便满足了当终端有外接电源接入时，终端由外接电源供电，电池只充电不对终端供电的要求，而且还适合3G手机的供电切换。
在终端使用外接电源供电，电池只充电不对终端供电的情况下，此时如果断开外接电源，电源转换模块110会马上停止工作，如此时场效应管Q202不能及时打开，电池将不能立即对系统供电模块供电，意味着终端将断电。因此本发明采用第二电阻R30和第三电阻R15的阻值之和为1.2KΩ～1.5 KΩ，能使电源转换模块中的第二滤波电路170中的电容储能电压及场效应管Q202的栅极G结电容储能在外接电源断开的时能迅速对地放电，使场效应管Q202的栅极G电压迅速下降到达Q202重新打开的状态，使得电池迅速实现对系统供电模块供电，实现了充电器拔出时电池迅速恢复对终端系统供电，终端依然正常工作的平滑切换。
本发明对应提供一种采用移动终端供电单元实现的移动终端供电切换方法，如图3所示，包括以下步骤：
100、电源转换模块检测是否有外接电源接入移动终端；如果有，则执行步骤300，否则，执行步骤200；
200、启动电池给移动终端供电；
300、当有外接电源接入移动终端时，停止电池给移动终端供电，电源转换模块将供电模式转换，启动外接电源给移动终端供电，并对电池充电；
400、当外接电源供电电流不足时，启动系统供电模块对移动终端进行放电补充。
基于上述方法，本发明提供移动终端供电单元，通过采用电源转换模块将外接电源电压转换成终端所需供电电压，电源切换模块对电池和电源转换模块之间的供电模式切换，实现了当有外接电源接入时，终端由外接电源供电，电池只充电不对终端供电，满足了《中国移动TD家庭手机规范》要求，而且还适合3G手机的供电切换。
可以理解的是，对本领域普通技术人员来说，可以根据本发明的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本发明所附的权利要求的保护范围。

Claims (9)

  1. 一种移动终端供电单元，包括电池，其特征在于，还包括：电源转换模块、充电管理模块、电源切换模块；所述充电管理模块和电源转换模块均包括一电源输入端口，用于连接外接电源；
    所述充电管理模块与电池连接，用于在外接电源接入时对电池充电；所述电源转换模块与所述电源切换模块连接，用于将外接电源电压转换成移动终端所需供电电压，以及控制所述电源切换模块的通断状态，使电源切换模块在没有外接电源接入时为导通状态，电池对移动终端供电，而在外接电源接入时，使所述电源切换模块断开，所述电源转换模块输出供电电压。
  2. 根据权利要求1所述的移动终端供电单元，其特征在于，还包括系统供电模块，该系统供电模块并接在所述电源转换模块的输出端，用于在移动终端射频发射的间隙进行充电储能，而在移动终端射频发射时放电。
  3. 根据权利要求1所述的移动终端供电单元，其特征在于，所述电源转换模块包括：型号为POWER-DC20C-TPS62040DRC的集成芯片，用于将外接电源电压转换成移动终端所需供电电压。
  4. 根据权利要求1所述的移动终端供电单元，其特征在于，所述电源切换模块包括：第二电阻、第三电阻和场效应管；所述第二电阻和第三电阻串联构成电压采样电路，所述第三电阻的一端与所述电源转换模块连接，所述电压采样电路的分压点连接所述场效应管的栅极，所述场效应管的源极与所述电池连接。
  5. 根据权利要求4所述的移动终端供电单元，其特征在于，所述第二电阻和第三电阻的阻值之和为1.2KΩ～1.5 KΩ。
  6. 根据权利要求1所述的移动终端供电单元，其特征在于，所述系统供电模块包括并联的第一电容和第二电容。
  7. 根据权利要求6所述的移动终端供电单元，其特征在于，所述第一电容和第二电容均为钽电容。
  8. 一种采用权利要求1所述移动终端供电单元实现的移动终端供电切换方法，其特征在于，所述方法包括以下步骤：
    A、检测是否有外接电源接入移动终端；如果有，则执行步骤B，否则，由电池给移动终端供电；
    B、停止电池对移动终端的供电，由外接电源给移动终端供电，并对电池充电。
  9. 根据权利要求8所述的方法，其特征在于，所述步骤B包括：
    B1、当外接电源供电电流不足时，启动系统供电模块对移动终端进行放电补充。
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