WO2016095346A1 - 用于移动终端的充电电路和移动终端 - Google Patents

用于移动终端的充电电路和移动终端 Download PDF

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Publication number
WO2016095346A1
WO2016095346A1 PCT/CN2015/073985 CN2015073985W WO2016095346A1 WO 2016095346 A1 WO2016095346 A1 WO 2016095346A1 CN 2015073985 W CN2015073985 W CN 2015073985W WO 2016095346 A1 WO2016095346 A1 WO 2016095346A1
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reference voltage
comparator
power
mobile terminal
output
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PCT/CN2015/073985
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English (en)
French (fr)
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艾真
蒋发标
茅永进
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中兴通讯股份有限公司
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Publication of WO2016095346A1 publication Critical patent/WO2016095346A1/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

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  • the utility model relates to a charging technology in the field of mobile devices, in particular to a charging circuit and a mobile terminal for a mobile terminal.
  • Mobile terminals usually use a two-stage charger, so there are two ways to cancel the charging: the first is to directly disconnect the charger from the terminal device; the second is to directly disconnect the charger from the mains socket. If it is the second method, since the capacitor energy storage device on the charger of the charger is kept connected to the motherboard of the mobile terminal, the capacitor energy storage device will continue to supply the charging voltage to the motherboard, so the charging voltage detected by the motherboard of the mobile terminal is The slowdown is slow, which causes the mobile terminal to not respond promptly to the action of canceling the charging.
  • the utility model provides a charging circuit and a mobile terminal, which aim to achieve the effect of quick response to the action of canceling charging.
  • the utility model provides a charging circuit for a mobile terminal, comprising: an access terminal for receiving external electric energy generated by an external charger, a power supply chip for receiving the external electric energy to output modulated electric energy, and a reference voltage for generating a reference voltage a device, and a comparator for comparing the reference voltage with a charging voltage of the external power and outputting a comparison result at a high level or a low level; wherein an input end of the power chip, and the Corresponding ports of the comparator are connected to the access terminal, and a reference voltage output terminal of the reference voltage device is connected to a corresponding port of the comparator.
  • the non-inverting input of the comparator is grounded via the first resistor and the second resistor in sequence,
  • the common ends of the first resistor and the second resistor are both connected to the access terminal, and the inverting input terminal of the comparator is connected to the output terminal of the reference voltage device.
  • the mobile terminal provided by the utility model comprises a charging circuit for accessing external electric energy, a battery for storing electric energy and an operating system main board for consuming electric energy; and the electric energy output by the external charger is respectively output to the charging circuit The battery and the operating system motherboard;
  • the charging circuit includes an access terminal for receiving external power generated by an external charger, a power chip for receiving the external power to output modulated power, a reference voltage device for generating a reference voltage, and a comparator that compares a reference voltage with a charging voltage of the external power and outputs a comparison result at a high level or a low level; wherein an input end of the power chip and a corresponding port of the comparator are both Connected to the access terminal, the reference voltage output end of the reference voltage device is connected to the corresponding port of the comparator;
  • An output end of the power chip is respectively connected to a corresponding port of the operating system motherboard and a corresponding port of the battery, and a comparison result output end of the comparator is connected to a corresponding port of the operating system motherboard.
  • the non-inverting input of the comparator is grounded via a first resistor and a second resistor in sequence, a common end of the first resistor and the second resistor is connected to the access terminal, and the comparator is reversed
  • the input is connected to the output of the reference voltage device.
  • the mobile terminal further includes an expansion interface for loading and controlling the high power device, the expansion interface and the access end of the charging circuit, the output end of the power chip, and the corresponding port of the operating system motherboard connection.
  • the comparator detects that the reference voltage is lower than the charging voltage of the external electric energy, it outputs a high level, otherwise outputs a low level; the operating system main board detects the high level, and the control station The high-power device operates at a high load, otherwise the high-power device is controlled to operate at a low load.
  • the access terminal is connected to the expansion interface via a diode, the power chip
  • the output terminal outputs the stepped modulated power, and the output end of the power chip is connected to the expansion interface via a booster circuit.
  • the mobile terminal further comprises a high power device connected to the expansion interface.
  • the charging circuit and the mobile terminal provided by the utility model increase the comparator and the reference voltage device, and the comparator compares the charging voltage of the access terminal with the reference voltage provided by the reference voltage device.
  • the comparator issues a trigger level to inform the charging voltage that the reference voltage is lower than the reference voltage. Therefore, the mobile terminal provided by the utility model has the condition that the charging voltage is lower than the reference voltage in time, and the level is sent to feedback.
  • the mobile terminal provided by the utility model sends a trigger level through the operating system motherboard to receive the comparator, so that the operating system motherboard can respond accordingly according to the feedback of the comparator.
  • FIG. 1 is a schematic block diagram of an embodiment of a mobile terminal of the present invention
  • FIG. 2 is a circuit diagram of the mobile terminal shown in FIG. 1;
  • FIG. 3 is a schematic diagram of an external charger connected to the mobile terminal shown in FIG. 1.
  • the utility model provides a charging circuit for a mobile terminal and a mobile terminal using the same.
  • the present embodiment will be described in detail by taking a mobile terminal using the above charging circuit as an example.
  • the embodiment provides a mobile terminal 100, which includes a charging circuit 1 for accessing external electrical energy, a battery 2 for storing electrical energy, and a power supply 2 for storing electrical energy.
  • a charging circuit 1 for accessing external electrical energy
  • a battery 2 for storing electrical energy
  • a power supply 2 for storing electrical energy.
  • An operating system motherboard 3 the electrical energy output by the external charger passes through the charging circuit 1 is output to the battery 2 and the operating system motherboard 3, respectively.
  • the charging circuit 1 includes an access terminal 11 for receiving external power generated by an external charger, a power chip 12 for receiving the external power to output modulated power, a reference voltage device 13 for generating a reference voltage, and a comparator 14 that compares the reference voltage with a charging voltage of the external power and outputs a comparison result at a high level or a low level; wherein an input end of the power chip 12 and the comparator Corresponding ports of 14 are connected to the access terminal 11, and a reference voltage output of the reference voltage device 13 is connected to a corresponding port of the comparator 14.
  • An output end of the power chip 12 is respectively connected to a corresponding port of the operating system motherboard 3 and a corresponding port of the battery 2, and a comparison result output end 143 of the comparator 14 is corresponding to the operating system motherboard 3. Port connection.
  • the mobile terminal 100 provided in this embodiment increases the comparator 14 and the reference voltage device 13, and the comparator 14 compares the charging voltage and the reference voltage device of the access terminal 11 at all times. 13 provides the reference voltage. When the charging is cancelled and the charging voltage is lower than the reference voltage, the comparator 14 issues a trigger level to inform that the charging voltage is lower than the reference voltage. Therefore, the mobile terminal provided in this embodiment has the condition that the charging voltage is lower than the reference voltage in time, and the level is sent to feedback. The mobile terminal provided in this embodiment sends a trigger level through the comparator 14 of the operating system motherboard 3, so that the operating system motherboard 3 can respond accordingly according to the feedback of the comparator 14.
  • the non-inverting input end 141 of the comparator 14 is grounded via the first resistor 15 and the second resistor 16 in sequence, and the common end of the first resistor 15 and the second resistor 16 is connected to the access terminal 11
  • the inverting input 142 of the comparator 14 is connected to the output of the reference voltage device 13.
  • the charging voltage accessed by the access terminal 11 is generally higher than the voltage normally allowed by the comparator 14, and thus can be divided by the first resistor 15, thereby reducing the voltage applied to the comparator 14 to conform to the comparator 14. Specifications.
  • the reference voltage provided by the reference voltage device 13 matches the voltage after the step-down.
  • the mobile terminal 100 further includes an expansion interface 17 for loading and controlling the high power device 4, the expansion interface 17 and the access end 11 of the charging circuit 1 and the output end of the power chip 12
  • an expansion interface 17 for loading and controlling the high power device 4, the expansion interface 17 and the access end 11 of the charging circuit 1 and the output end of the power chip 12
  • the corresponding port connection of the operating system motherboard 3 is described.
  • the high-power device 4 is directly powered by the access terminal; when the access terminal 11 is separated from the external charger, the battery 2 is switched to the power supply.
  • the high power device 4 can be an internal component of the mobile terminal 100, and can of course also be an external device.
  • the comparator 14 detects that the reference voltage is lower than the charging voltage of the external power, it outputs a high level, otherwise outputs a low level; the operating system main board 3 detects the high level.
  • the high-power device 4 is controlled to operate at a high load, otherwise the high-power device 4 is controlled to operate at a low load.
  • the non-inverting input terminal 141 and the inverting input terminal 142 of the comparator 14 can also be reversely connected to the reference voltage device 13 and the access terminal 11, respectively, so that when the operating system mainboard 3 detects a low level, the control station The high power device 4 is operated at a high load, otherwise the high power device 4 is controlled to operate at a low load.
  • the access terminal 11 is connected to the expansion interface 17 via a diode 19, so that the power of the battery 2 is transmitted to the access terminal 11 after the access terminal 11 is powered off.
  • the output end of the power chip 12 outputs the stepped modulated electric energy, and the output end of the power chip 12 is connected to the expansion interface 17 via the boosting circuit 18.
  • the rated voltage of the high-power device 4 is 12V, and the rated power is 25W; the output voltage of the external charger 5 is 12V, and the output power is 48W as an example for detailed description.
  • the mobile terminal will have certain technical problems when starting the above-mentioned high-power device 4. Specifically, the mobile terminal usually adopts a low-power consumption platform, and the system is powered by the battery 2 of 4.3V, and the capacity of the battery 2 is about 3000 mhA. Since the mobile terminal 100 has mobility, there is a case where the battery 2 is separately powered. Due to the size and safety level of the mobile terminal, the battery 2 can achieve a maximum capacity of 4.35V/6300mAh. Even if the battery is fully charged, it can only provide about 24w of instantaneous power when the battery 2 is fully charged. Therefore, when the battery 2 is powered separately, it does not have At the same time, it is capable of operating the high power device 4 and the operating system motherboard 3 at normal power.
  • the battery 2 When the normal power operation of the high-power device 4 and the operating system motherboard 3 occurs, the battery 2 will enter the over-current protection state due to the excessive current, thereby causing the mobile terminal to be powered off. Therefore, it is critical to avoid the battery 2 from simultaneously charging the high power device 4 and the operating system motherboard 3 for normal power operation.
  • the existing mobile terminal cannot solve the above problem. Specifically, the existing mobile terminal uses the power chip 12 to detect the voltage Vin_12V provided by the access terminal 11, and when the power chip 12 can only detect the voltage Vin_12V drops to less than 4V (this When the 4V is determined according to the rated output voltage of the battery 2, the corresponding signal INT1 is issued to the operating system motherboard 3. If the external charger 5 is separated from the external outlet, the voltage Vin_12V supplied from the access terminal 11 will slowly drop due to the action of the capacitive energy storage device 51 of the external charger 5.
  • the operating system motherboard 3 When it takes 15ms or more to drop from 12V to 4V, the operating system motherboard 3 will receive the signal INT1 after 15ms, and the software processing time of the operating system motherboard 3 is 2ms ⁇ 3ms, so the overall reaction time of the operating system motherboard 3 will be More than 17ms. At this point, the mobile terminal has completely switched to the battery 2 to supply power, and the battery 2 will enter the overcurrent protection state due to the excessive current, thereby causing the mobile terminal to lose power.
  • the mobile terminal provided in this embodiment can solve the above problem, and the details are as follows:
  • the access terminal 11 outputs the voltage VIN_12V of the access 12V to the high-power device 4 and the power chip 12, and the high-power device 4 will work at full power when receiving the voltage VIN_12V, and the power chip 12 will work normally when receiving the voltage VIN_12V, and compare
  • the non-inverting input 141 of the receiver 14 receives the voltage VIN_12V for comparison use.
  • the power chip 12 steps down the voltage VIN_12V to 5V and outputs the voltage VPH_PWR to the operating system motherboard 3 to supply power to the operating system motherboard 3.
  • the power chip 12 also outputs power to the battery 2 to charge the battery 2.
  • a driving voltage supply is supplied to the comparator 14 and the reference voltage device 13 so that the reference voltage device 13 can
  • the reference voltage is 11V (this 11V is dependent on the magnitude of voltage Vin_12V).
  • the comparator 14 can compare the magnitudes of the reference voltage and the voltage Vin_12V and output the comparison result to the operating system main board 3. It should be noted that the voltage VIN_12V and the reference voltage should be reduced by an equal multiple, and then input to the comparator 14 for comparison, in order to comply with the specifications of the comparator 14.
  • the comparator 14 detects that the voltage Vin_12V provided by the access terminal 11 is less than the reference voltage provided by the reference voltage device 13 and only takes 1 ms to 2 ms, and the comparator 14 sets the interrupt signal INT2 within 1 ms to 2 ms (high level). ) to the operating system motherboard 3.
  • the high power device 4 can be controlled to reduce the operating power to operate at a low load.
  • the time from when the access terminal 11 is powered off to when the operating system motherboard 3 receives the power-off information takes only 1 ms to 2 ms, and the software processing time of the operating system motherboard 3 is 2 ms to 3 ms, thereby operating the operating system motherboard.
  • the overall reaction time of 3 will be within 5ms. Therefore, the operating system motherboard 3 can react quickly, and control the high-power device 4 to operate at a low load, for example, reduce the power of the high-power device 4 to 5w.
  • the power chip 12 When the voltage Vin_12V provided by the access terminal 11 is lowered to be lower than the output voltage of the battery 2 by 4.3V, the power chip 12 is completely switched to the battery 2 for output, and the power outputted by the battery 2 is output to the high-power device through the boosting circuit 18. 4. Since the high-power device 4 is already running at a low load before the power is fully switched to the battery 2, the battery 2 can stably drive the high-power device 4 and the operating system motherboard 3 without overcurrent protection.

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  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

一种用于移动终端的充电电路(1)和移动终端(100)，其中，充电电路(1)包括用于接收外部充电器产生的外部电能的接入端(11)、用于接收外部电能以输出调制电能的电源芯片(12)、用于产生参考电压的参考电压设备(13)，以及用于将参考电压与外部电能的充电电压进行比较并以高电平或低电平来输出比较结果的比较器(14)，其中，电源芯片(12)的输入端、以及比较器(14)的相应端口均与接入端(11)连接，参考电压设备(13)的参考电压输出端与比较器(14)的相应端口连接。

Description

用于移动终端的充电电路和移动终端 技术领域
本实用新型涉及移动设备领域的充电技术，尤其涉及用于移动终端的充电电路和移动终端。
背景技术
移动终端通常采用两段式充电器，因此取消充电的方式有两种：第一种是直接断开充电器与终端设备的连接；第二种是直接断开充电器与市电插座的连接。如果是第二种方法，由于充电器的变压器上的电容储能设备与移动终端的主板保持连接，则电容储能设备将继续为主板提供充电电压，因此移动终端的主板检测到的充电电压的下降速度较为缓慢，导致移动终端不能对取消充电的动作做出及时的响应。
发明内容
本实用新型提供一种充电电路和移动终端，旨在达到对取消充电的动作进行快速响应的效果。
本实用新型提供用于移动终端的充电电路包括用于接收外部充电器产生的外部电能的接入端、用于接收所述外部电能以输出调制电能的电源芯片、用于产生参考电压的参考电压设备，以及用于将所述参考电压与所述外部电能的充电电压进行比较并以高电平或低电平来输出比较结果的比较器；其中，所述电源芯片的输入端、以及所述比较器的相应端口均与所述接入端连接，所述参考电压设备的参考电压输出端与所述比较器的相应端口连接。
优选地，所述比较器的同向输入端依次经由第一电阻和第二电阻接地， 所述第一电阻和第二电阻的公共端均与所述接入端连接，所述比较器的反向输入端与所述参考电压设备的输出端连接。
本实用新型提供的移动终端包括用于接入外部电能的充电电路，用于储存电能的电池和用于消耗电能的操作系统主板；所述外部充电器输出的电能经所述充电电路分别输出给所述电池和所述操作系统主板；
所述充电电路包括用于接收外部充电器产生的外部电能的接入端、用于接收所述外部电能以输出调制电能的电源芯片、用于产生参考电压的参考电压设备、以及用于将所述参考电压与所述外部电能的充电电压进行比较并以高电平或低电平来输出比较结果的比较器；其中，所述电源芯片的输入端和所述比较器的相应端口均与所述接入端连接，所述参考电压设备的参考电压输出端与所述比较器的相应端口连接；
所述电源芯片的输出端分别与所述操作系统主板的相应端口、以及所述电池的相应端口连接，所述比较器的比较结果输出端与所述操作系统主板的相应端口连接。
优选地，所述比较器的同向输入端依次经由第一电阻和第二电阻接地，所述第一电阻和第二电阻的公共端与所述接入端的连接，所述比较器的反向输入端与所述参考电压设备的输出端连接。
优选地，所述移动终端还包括用于负载并控制大功率设备的扩展接口，所述扩展接口与所述充电电路的接入端、所述电源芯片的输出端所述操作系统主板的相应端口连接。
优选地，当所述比较器检测到所述参考电压低于所述外部电能的充电电压时输出高电平，否则输出低电平；所述操作系统主板检测到所述高电平则控制所述大功率设备高负载运行，否则控制所述大功率设备低负载运行。
优选地，所述接入端经由二极管连接所述扩展接口，所述电源芯片的 输出端输出降压后的调制电能，所述电源芯片的输出端经由升压电路与所述扩展接口连接。
优选地，所述移动终端还包括与所述扩展接口连接的大功率设备。
本实用新型所提供的充电电路和移动终端，通过增加比较器和参考电压设备，并且比较器对比接入端的充电电压与参考电压设备提供的参考电压。当取消充电而充电电压低于参考电压时，则比较器则发出触发电平，以告知充电电压低于参考电压。因此本实用新型所提供的移动终端具有及时发现充电电压低于参考电压的情况，并发出电平以反馈。本实用新型所提供的移动终端，再通过操作系统主板接收比较器则发出触发电平，从而操作系统主板可以及时的根据比较器的反馈而做出相应的反应。
附图说明
图1为本实用新型移动终端一实施例的模块示意图；
图2为与图1所示移动终端的电路示意图；
图3为与图1所示移动终端连接的外部充电器的示意图。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。
本实用新型提供了一种用于移动终端的充电电路和采用该充电电路的移动终端。为了能够更清楚的介绍用于移动终端的充电电路的技术特征和有益效果，本实施例以采用了上述充电电路的一移动终端为例子来详细说明。
请结合参看图1和图2，本实施例提供了一种移动终端100，所述移动终端100包括用于接入外部电能的充电电路1，用于储存电能的电池2和用于消耗电能的操作系统主板3；所述外部充电器输出的电能经所述充电电路 1分别输出给所述电池2和所述操作系统主板3。
所述充电电路1包括用于接收外部充电器产生的外部电能的接入端11、用于接收所述外部电能以输出调制电能的电源芯片12、用于产生参考电压的参考电压设备13和用于将所述参考电压与所述外部电能的充电电压进行比较并以高电平或低电平来输出比较结果的比较器14；其中，所述电源芯片12的输入端、以及所述比较器14的相应端口均与所述接入端11连接，所述参考电压设备13的参考电压输出端与所述比较器14的相应端口连接。
所述电源芯片12的输出端分别与所述操作系统主板3的相应端口、以及所述电池2的相应端口连接，所述比较器14的比较结果输出端143与所述操作系统主板3的相应端口连接。
为了解决背景技术中所提及的技术问题，本实施例所提供的移动终端100，通过增加比较器14和参考电压设备13，并且比较器14时刻对比接入端11的充电电压与参考电压设备13提供的参考电压。当取消充电而充电电压低于参考电压时，则比较器14则发出触发电平，以告知充电电压低于参考电压。因此本实施例所提供的移动终端具有及时发现充电电压低于参考电压的情况，并发出电平以反馈。本实施例所提供的移动终端，再通过操作系统主板3接收比较器14则发出触发电平，从而操作系统主板3可以及时的根据比较器14的反馈而做出相应的反应。
优选地，所述比较器14的同向输入端141依次经由第一电阻15和第二电阻16接地，所述第一电阻15和第二电阻16的公共端与所述接入端11的连接，所述比较器14的反向输入端142与所述参考电压设备13的输出端连接。接入端11接入的充电电压一般会高于比较器14通常所允许加载的电压，因此可以通过第一电阻15来分压，从而降低加载在比较器14上的电压，以符合比较器14的规格。相应的，参考电压设备13所提供的参考电压与降压后的电压相匹配。
优选地，所述移动终端100还包括用于负载并控制大功率设备4的扩展接口17，所述扩展接口17与所述充电电路1的接入端11、所述电源芯片12的输出端所述操作系统主板3的相应端口连接。当接入端11与外部充电器连接时，则由接入端直接对大功率设备4供电；当接入端11与外部充电器分离后，则切换至电池2供电。大功率设备4可以为移动终端100的内部元件，当然也可以是外接的设备。
优选地，当所述比较器14检测到所述参考电压低于所述外部电能的充电电压时输出高电平，否则输出低电平；所述操作系统主板3检测到所述高电平则控制所述大功率设备4高负载运行，否则控制所述大功率设备4低负载运行。当然，还可以将比较器14的同向输入端141和反向输入端142分别与参考电压设备13和接入端11反接，从而当所述操作系统主板3检测到低电平则控制所述大功率设备4高负载运行，否则控制所述大功率设备4低负载运行。
优选地，所述接入端11经由二极管19连接所述扩展接口17，从而避免接入端11断电后，电池2的电能传输至接入端11。所述电源芯片12的输出端输出降压后的调制电能，所述电源芯片12的输出端经由升压电路18与所述扩展接口17连接。
请结合参看图3，现以大功率设备4的额定电压为12V，额定功率为25W；外部充电器5的输出电压为12V，输出功率为48W为例来详细说明。
移动终端在启动上述大功率设备4时将存在一定的技术问题，具体地：移动终端通常采用低功耗的平台，系统用4.3V的电池2供电，电池2的容量在3000mhA左右。因为移动终端100具有可移动性，则必然存在电池2单独供电的情况。受到移动终端的外型尺寸和安全等级限制，电池2最多做到4.35V/6300mAh的容量，即使是1cc放电，在电池2满电的时候也只能提供24w左右的瞬间功率。所以，在单独电池2供电的时候，是不具有 同时负担大功率设备4和操作系统主板3正常功率运行的能力的。当出现了同时负担大功率设备4和操作系统主板3正常功率运行的情况，则电池2将因为电流过大而进入过流保护状态，进而使得移动终端掉电关机。因此，避免电池2同时负担大功率设备4和操作系统主板3正常功率运行是关键。
但是现有的移动终端不能解决上述问题，具体地，现有的移动终端采用电源芯片12检测接入端11提供的电压Vin_12V，当电源芯片12仅能在检测到电压Vin_12V下降至小于4V(该4V根据电池2的额定输出电压而定)时，才会发出相应的信号INT1至操作系统主板3。如果在外部充电器5与外部插座分离时，由于外部充电器5的电容储能设备51的作用，将使得接入端11提供的电压Vin_12V缓慢下降。而从12V掉到4V需要15ms以上，则操作系统主板3将在15ms之后才接收到信号INT1，再加上操作系统主板3的软件处理时间2ms～3ms，从而操作系统主板3的总体反应时间将超过17ms。此时移动终端已经完全切换到电池2供电了，电池2会因为电流过大而进入过流保护状态，从而导致移动终端掉电。
本实施例所提供的移动终端，可以解决上述问题，具体如下：
当接入端11与外部充电器5连接，并接收充电器输出的电能时：
则接入端11将接入12V的电压VIN_12V输出至大功率设备4和电源芯片12，大功率设备4接收到电压VIN_12V时将全功率工作，电源芯片12接收到电压VIN_12V时将正常工作，比较器14的同向输入端141接收电压VIN_12V以作比较使用。
电源芯片12将电压VIN_12V降压至5V后输出电压VPH_PWR至操作系统主板3，以对操作系统主板3供电；电源芯片12还对电池2输出电能以对电池2充电。
操作系统主板3接收到电源芯片12提供的电能而运行时，将提供驱动电压supply至比较器14和参考电压设备13，以使得参考电压设备13能提 供参考电压至比较器14，优选地，参考电压为11V(该11V根据电压Vin_12V的大小而定)。比较器14能比较参考电压和电压Vin_12V的大小并输出比较结果至操作系统主板3。应当说明的是，电压VIN_12V与参考电压都应当进行同等倍数的降低后，才输入比较器14进行比较，为的是符合比较器14的规格。
当接入端11与外部充电器5断开时，或接入端11与外部充电器5连接但外部充电器5与市电插座断开时，由于此时接入端11提供的电压Vin_12V将快速降低，例如从12V降低至11V的时间仅需1ms～2ms。从而比较器14检测到接入端11提供的电压Vin_12V小于参考电压设备13提供的参考电压的时间也仅需1ms～2ms，则比较器14在1ms～2ms之内将中断信号INT2(高电平)至操作系统主板3。当操作系统主板3接收到中断信号INT2，则可以控制大功率设备4降低工作功率从而低负载运行。从而可以看出，从接入端11断电到操作系统主板3接收到该断电信息的时间仅需1ms～2ms，再加上操作系统主板3的软件处理时间2ms～3ms，从而操作系统主板3的总体反应时间将在5ms以内。因此，操作系统主板3可以快速的进行反应，而控制大功率设备4低负载运行，例如降低大功率设备4的功率至5w。
电源芯片12在接入端11提供的电压Vin_12V降低至低于电池2的输出电压4.3V时，即完全切换至电池2进行输出，电池2输出的电能经升压电路18后输出至大功率设备4。由于当完全切换为电池2提供电能前，大功率设备4则已经低负载运行，则电池2能够稳定的驱动大功率设备4及操作系统主板3运行，而不会出现过流保护的现象。
以上仅为本实用新型的优选实施例，并非因此限制本实用新型的专利范围，凡是利用本实用新型说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本实用新 型的专利保护范围内。

Claims (8)

  1. 一种用于移动终端的充电电路，所述充电电路包括用于接收外部充电器产生的外部电能的接入端、用于接收所述外部电能以输出调制电能的电源芯片、用于产生参考电压的参考电压设备，以及用于将所述参考电压与所述外部电能的充电电压进行比较并以高电平或低电平来输出比较结果的比较器；其中，所述电源芯片的输入端、以及所述比较器的相应端口均与所述接入端连接，所述参考电压设备的参考电压输出端与所述比较器的相应端口连接。
  2. 如权利要求1所述的用于移动终端的充电电路，其中，所述比较器的同向输入端依次经由第一电阻和第二电阻接地，所述第一电阻和第二电阻的公共端均与所述接入端连接，所述比较器的反向输入端与所述参考电压设备的输出端连接。
  3. 一种移动终端，所述移动终端包括用于接入外部电能的充电电路，用于储存电能的电池和用于消耗电能的操作系统主板；所述外部充电器输出的电能经所述充电电路分别输出给所述电池和所述操作系统主板；
    所述充电电路包括用于接收外部充电器产生的外部电能的接入端、用于接收所述外部电能以输出调制电能的电源芯片、用于产生参考电压的参考电压设备，以及用于将所述参考电压与所述外部电能的充电电压进行比较并以高电平或低电平来输出比较结果的比较器；其中，所述电源芯片的输入端、以及所述比较器的相应端口均与所述接入端连接，所述参考电压设备的参考电压输出端与所述比较器的相应端口连接；
    所述电源芯片的输出端分别与所述操作系统主板的相应端口、以及所述电池的相应端口连接，所述比较器的比较结果输出端与所述操作系统主板的相应端口连接。
  4. 如权利要求3所述的移动终端，其中，所述比较器的同向输入端依 次经由第一电阻和第二电阻接地，所述第一电阻和第二电阻的公共端均与所述接入端连接，所述比较器的反向输入端与所述参考电压设备的输出端连接。
  5. 如权利要求4所述的移动终端，其中，所述移动终端还包括用于负载并控制大功率设备的扩展接口，所述扩展接口与所述充电电路的接入端、所述电源芯片的输出端所述操作系统主板的相应端口连接。
  6. 如权利要求5所述的移动终端，其中，当所述比较器检测到所述参考电压低于所述外部电能的充电电压时输出高电平，否则输出低电平；所述操作系统主板检测到所述高电平则控制所述大功率设备高负载运行，否则控制所述大功率设备低负载运行。
  7. 如权利要求6所述的移动终端，其中，所述接入端经由二极管连接所述扩展接口，所述电源芯片的输出端输出降压后的调制电能，所述电源芯片的输出端经由升压电路与所述扩展接口连接。
  8. 如权利要求5、6或7所述的移动终端，其中，所述移动终端还包括与所述扩展接口连接的大功率设备。
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