WO2019109361A1 - Charging circuit and electronic device - Google Patents

Charging circuit and electronic device Download PDF

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Publication number
WO2019109361A1
WO2019109361A1 PCT/CN2017/115341 CN2017115341W WO2019109361A1 WO 2019109361 A1 WO2019109361 A1 WO 2019109361A1 CN 2017115341 W CN2017115341 W CN 2017115341W WO 2019109361 A1 WO2019109361 A1 WO 2019109361A1
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WO
WIPO (PCT)
Prior art keywords
charging
signal
unit
electrically connected
power input
Prior art date
Application number
PCT/CN2017/115341
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French (fr)
Chinese (zh)
Inventor
郭启明
刘兴慧
Original Assignee
深圳市柔宇科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市柔宇科技有限公司 filed Critical 深圳市柔宇科技有限公司
Priority to CN201780097169.5A priority Critical patent/CN111386642A/en
Priority to PCT/CN2017/115341 priority patent/WO2019109361A1/en
Publication of WO2019109361A1 publication Critical patent/WO2019109361A1/en

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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

Definitions

  • the present invention relates to a charging circuit applied to an electronic device, and more particularly to a charging circuit capable of preventing battery backflow during rapid charging.
  • the electronic device performs charging through the charging circuit.
  • the usual solution when performing fast charging is to directly supply the charging power (charging current, charging voltage) received outside the word to the rechargeable battery through the switching unit in the charging circuit, that is, relative
  • the current supplied to the rechargeable battery after being converted by the power management chip for the charging power source is improved.
  • the electronic device can generally select to perform fast charging or normal charging according to the user's needs, that is, The fast charging or normal charging is selected by setting a corresponding control circuit according to an instruction input by the user.
  • the external power supply is disconnected from the control circuit during the fast charging process, that is, the electronic device is electrically disconnected from the external power supply
  • the voltage and current of the rechargeable battery are poured back to the connection interface through the switch unit, so that The voltage of the connection interface is always maintained at a certain potential, so that the control unit in the electronic device cannot accurately know whether the external power supply is disconnected at this time, resulting in misjudgment or false triggering, thereby making the working stability of the electronic device poor.
  • the embodiment of the invention discloses a charging circuit with high stability.
  • an electronic device including the aforementioned charging circuit is provided.
  • the invention discloses a charging circuit, comprising: a power input end, a switch module, an energy storage unit and a control unit.
  • the power input terminal is configured to receive a charging power source, and the charging power source includes a charging voltage and a charging current.
  • the switch module is electrically connected between the power input end and the energy storage unit.
  • Control unit The switch module is electrically connected, and when the control unit receives the fast charging signal, and the power input receives the charging power, the first control signal is outputted by the switch module.
  • the switch module includes a first switch unit, a second switch unit, and a first comparison unit, wherein when the power input terminal receives the charging power source, the first comparison unit outputs a first comparison signal to the a second opening unit, the second switching unit outputs an on signal to the first switching unit under control of the first control signal and the first comparison signal, and the first switching unit is responsive to the conduction signal In an on state, the power input terminal is electrically connected to the energy storage unit, and the charging power source is transmitted to the energy storage unit to perform fast charging.
  • the first comparison unit When the power input terminal stops receiving the charging power source, the first comparison unit outputs a second comparison signal to the second open unit, and the second switch unit outputs a cutoff signal to the second comparison signal control to a first switching unit, wherein the first switching unit is in an off state in response to the off signal, so that the power input end is electrically disconnected from the energy storage unit, and the power signal of the energy storage unit is prevented from being poured to The power input terminal.
  • the invention also discloses an electronic device comprising the foregoing charging circuit and a connection interface, the connection interface comprises a first power supply pin, the first power supply pin is electrically connected to the power input end, and when the connection interface is inserted Receiving an external power supply and receiving the charging voltage, the power input receiving the charging power; when the connection interface is disconnected from the external power supply, the power input stops receiving the charging power supply.
  • the charging circuit can quickly control the first power supply terminal and the energy storage unit through the first comparison unit in the switch module, and can quickly control the first power supply and the connection interface to be controlled by the second switch unit.
  • the switch unit is in an off state, thereby preventing the voltage of the energy storage unit from being inverted to the power input end, so that the control unit cannot accurately know the accurate state of the power input end, thereby effectively improving the working stability of the charging circuit and the electronic device.
  • 1 is a circuit block diagram of a charging circuit in an electronic device
  • FIG. 2 is a schematic diagram of a specific circuit structure of the switch module shown in FIG. 1;
  • FIG. 3 is a schematic diagram showing a specific circuit structure of the plug detecting circuit shown in FIG. 1.
  • the electronic device 100 includes a charging circuit 10 and a connection interface 101 , wherein the charging circuit 10 is electrically connected to the connection interface 101 , and the connection interface 101 is used for plugging or unplugging with an external power supply (not shown).
  • the connection interface 101 is plugged into an external power supply (not shown)
  • the external power supply is electrically connected to the charging circuit 10, and the external power supply supplies the charging power to the charging circuit 10 through the connection interface 101; when the connection interface 101 and When the external power supply (not shown) is disconnected, the external power supply is electrically disconnected from the charging circuit, and the connection interface 101 stops supplying the charging power to the charging circuit 10.
  • the charging power source includes a charging voltage and a charging current.
  • connection interface 101 includes a first power pin Vbus, a first data pin D1 and a second data pin D2, and a ground pin G1, wherein the first power pin Vbus cooperates with the ground pin G1 to transmit a charging voltage.
  • the first data pin D1 and the second data pin D2 cooperate to perform data transmission.
  • the connection interface 101 is a Universal Serial Bus (USB).
  • the charging circuit 10 includes a power input terminal Vin, a switch module 11, a charge management unit 12, an energy storage unit 13, a control unit 14, and a plug detection circuit 15.
  • the power input terminal Vin is electrically connected to a power pin Vbus for receiving a charging power source, and the charging power source includes a charging voltage and a charging current.
  • the switch module 11 is electrically connected between the power input terminal Vin and the charging end 131 of the energy storage unit 13, and the charging management unit 12 is electrically connected to the power input terminal Vin and the charging end 131 of the energy storage unit 13, that is, The switch module 11 and the charge management unit 12 are connected in parallel with each other and electrically connected between the power input terminal Vin and the energy storage unit 13 for transmitting the charging power to the energy storage unit 13.
  • the switch module 11 is configured to directly supply the charging voltage and the charging current to the energy storage unit 14 to perform fast charging for the energy storage unit 13 .
  • the charging management unit 12 is configured to process the charging voltage and the charging current into a first charging voltage and a first charging current and then provide the same to the energy storage unit 13 , wherein the first charging current is smaller than the charging current to perform for the energy storage unit 13 Ordinary charging.
  • the energy storage unit 13 receives the charging power source or the converted first charging voltage and the first charging current from the charging terminal 131.
  • the energy storage unit 13 is a lithium battery or a rechargeable battery such as nickel cadmium, nickel hydrogen, lithium ion, lead storage, or iron lithium.
  • the switch module 11 and the charge management unit 12 are also electrically connected to the control unit 14 at the same time, and both are not in operation under the control of the control unit 14, that is, the charging power source is not simultaneously transmitted to the energy storage unit 13.
  • the switch module 11 When the switch module 11 is in the working state, that is, when the open module 11 is in the on state, the charging voltage and the charging current are directly supplied to the energy storage unit 14 to perform fast charging; when the charging management unit 12 is in the working state, The charging voltage and the charging current are converted into a first charging voltage and a first charging current and then supplied to the energy storage unit 13 to perform normal charging. It should be noted that when the switch module 11 stops working and is not in the working state, it indicates that it is in the off state.
  • the plug-in detection circuit 15 is electrically connected to the power input terminal Vin and the control unit 14, and detects the connection of the connection interface 101 and the external power supply by detecting the voltage of the power input terminal Vin, that is, detecting the connection interface 101 and the external power supply.
  • the power supply is plugged or unplugged, and then the corresponding detection signal is output to the control unit 15 according to the detection condition.
  • the plug detecting circuit 15 When the voltage of the power input terminal Vin indicates that the detection connection interface 101 is in the plugged state, that is, the power input terminal Vin receives the charging power, the plug detecting circuit 15 outputs the first detection signal to the control unit 14, Correspondingly, the control unit 14 outputs the first control signal according to the first detection signal and the fast charging signal.
  • the electronic device 100 generates the fast charging signal in response to a preset operation by the user.
  • the plug detection circuit 15 When the voltage of the power input terminal Vin indicates that the detection connection interface 101 and the external power supply are in the disconnected state, that is, the power input terminal Vin stops receiving the charging power, and the power input terminal Vin and the energy storage unit 14 are electrically disconnected. Then, the plug detection circuit 15 outputs the second detection signal to the control unit 14, and correspondingly, the control unit 14 outputs the second control signal to the switch module 11, further ensuring that the switch module 11 is in an off state. It can be understood that the detection signal includes a first detection signal and a second detection signal.
  • the control unit 14 also receives a fast charging signal or a normal charging signal that the user inputs by operating the electronic device 100.
  • a fast charging signal or a normal charging signal that the user inputs by operating the electronic device 100.
  • the control unit 14 When the control unit 14 receives the fast charging signal, the control unit 14 outputs a first control signal to the switch module 11, and the switch module 11 controls the first control signal to be in an active state and performs fast charging;
  • the detection signal provided by the plug detecting circuit 15 indicates that the detecting connection interface 101 and the external power supply are in the disconnected state, that is, when the power input terminal Vin stops receiving the charging power
  • the control unit 14 outputs the second control signal to
  • the switch module 11 and the switch module 11 are in an off state under the control of the second control signal and stop working, and the power input terminal Vin and the charging terminal 131 are electrically disconnected, thereby accurately preventing the power signal (voltage) of the energy storage unit 13
  • the current is transmitted through the switch module 11 to the first power pin Vbus in the connection interface 101 connected to the power input terminal Vin to avoid erroneous determination caused by the inability to accurately detect the voltage state of the first power pin Vbus.
  • FIG. 2 is a schematic diagram of a specific circuit structure of the charging circuit shown in FIG. 1 .
  • the switch module 11 includes a first switch unit 110 , a second switch unit 112 , and a first comparison unit 114 .
  • the first comparison unit 114 is electrically connected to the power input terminal Vin and the charging terminal 131 for determining the magnitude of the voltage of the power input terminal Vin and the charging terminal 131, and outputting a corresponding comparison signal according to the determination result to identify the power source. Whether the input terminal Vin receives the charging voltage, that is, it is recognized that the external power supply is in the plugged state with the connection interface 101 and provides the charging power or the external power supply and the connection interface 101 are in the disconnected state and the charging power supply is stopped.
  • the first comparison unit 114 outputs a first comparison signal.
  • the comparison signal includes a first comparison signal and a second comparison signal.
  • the second switching unit 112 is electrically connected to the first switching unit 110, the first comparing unit 114 and the control unit 14 for correspondingly outputting an on signal according to the comparison signal output by the first comparing unit 114 and the control signal output by the control unit 14. Or the off signal is sent to the first switching unit 110 to control the first open unit 110 to be in an on state or an off state.
  • the second switching unit 112 receives the first comparison signal output by the first comparison unit 114 and the control unit 14 outputs a first control signal, where the The second switching unit 112 outputs an on signal to the first switching unit 110 to control the first switching unit 110 to be in an on state; and when the second switching unit 112 receives the second output from the first comparison unit 114 When comparing the signals, the second switching unit 112 outputs the cutoff signal to the first switching unit 110 to control the first switching unit 110 to be in an off state.
  • the first open unit 110 is in an on state, indicating that the switch module 11 is in an on state, and the first open unit 110 is in an off state, indicating that the switch module 11 is in an off state as a whole.
  • the first switch unit 110 includes a first connection end 1101, a second connection end 1102, and a first control end 1103.
  • the first connection end 1101 is electrically connected to the power input terminal Vin
  • the second connection end 1102 is electrically connected to the charging end 131
  • the first control end 1103 is electrically connected to the second switch unit 112 for receiving the conduction signal. Or cut off the signal.
  • the first switching unit includes a first field effect transistor Q1, a second field effect transistor Q2, a first parasitic body diode BD1 and a second parasitic body diode BD2.
  • the drain D of the first field effect transistor Q1 is electrically connected to the first connection end 1101, and the source S of the first field effect transistor Q1 is electrically connected to the source S of the second field effect transistor Q2, and the first field effect transistor Q1
  • the gate G is electrically connected to the first control end 1103, the drain D of the second field effect transistor Q2 is electrically connected to the second connection end 1102, and the gate G of the second field effect transistor Q2 is electrically connected to the first control end 1103.
  • the first field effect transistor Q1 and the second field effect transistor Q2 are connected in series in a source-to-source manner to form a back-to-back field effect transistor switch.
  • An anode (not shown) of the first parasitic body diode BD1 is electrically connected to the drain D of the first field effect transistor Q1, and a cathode (not labeled) of the first parasitic body diode BD1 is electrically connected to the source of the first field effect transistor Q1.
  • the anode (not shown) of the second parasitic body diode BD2 is electrically connected to the drain D of the second field effect transistor Q2, and the cathode (not labeled) of the second parasitic body diode BD2 is electrically connected to the second field effect.
  • the first comparison unit 114 includes an operational amplification comparator AMP including an in-phase terminal IN+, an inverting terminal IN-, and a comparison output terminal OUT1.
  • the non-inverting terminal IN+ is electrically connected to the power input terminal Vin
  • the inverting terminal IN- is electrically connected to the charging terminal 131.
  • the operational amplification comparator AMP is configured to compare the voltage of the power input terminal Vin with the energy storage unit and output the first comparison signal or the second comparison signal from the comparison output terminal OUT1 according to the comparison result.
  • the power driving terminal (not shown) of the operational amplification comparator AMP receives the driving voltage V+ to drive the operational amplifier AMP to operate normally, and additionally, the grounding of the operational amplifier AMP
  • the reference terminal (not shown) is connected to the ground.
  • the second switch unit 112 includes a first conductive end 1121, a second conductive end 1122, a first switch control end 1123 and a second switch control end 1124.
  • the first conductive end 1121 is electrically connected to the first control end 1103 of the first switch unit 110 for outputting the turn-on signal or the cut-off signal to the first switch unit 110.
  • the second conductive end 1122 is electrically connected to the ground GND.
  • the first switch control terminal 1121 is electrically connected to the control unit 14 for receiving the first control signal or the second control signal.
  • the second switch control terminal 1122 is electrically connected to the comparison output terminal OUT1 for receiving the first comparison signal or the second comparison signal.
  • the second switching unit 112 further includes a first transistor T1 and a second transistor T2.
  • the base b of the first transistor T1 is electrically connected to the first switch control end 1123, and the collector c of the first transistor T1 is electrically connected to the first conductive end 1121; the emitter e of the first transistor T1 is electrically connected to the second The collector c of the transistor T2, the base b of the second transistor T2 is electrically connected to the second switch control terminal 1124; the emitter E of the second transistor T2 is electrically connected to the second conductive terminal 1122.
  • the first transistor T1 and the second transistor T2 are NPN type transistors.
  • the first control signal is a high level signal
  • the first comparison signal is a high level signal
  • the second comparison signal is a low level signal.
  • FIG. 3 is a schematic diagram of a specific circuit structure of the plug detection circuit 15 shown in FIG. 1 .
  • the plug detecting circuit 15 includes a detecting output terminal 151, a first voltage dividing resistor R1 and a second voltage dividing resistor R2.
  • the first voltage dividing resistor R1 is electrically connected between the power input terminal Vin and the detecting output terminal 151
  • the second voltage dividing resistor R2 is electrically connected between the detecting output terminal 151 and the grounding terminal GND
  • the detecting output terminal 151 is electrically connected to the control unit.
  • the plug detecting circuit 15 outputs the second detection signal or the second detection signal to the control unit 14 through the detection output terminal 151.
  • the plug detecting circuit 15 when the voltage of the power input terminal Vin indicates that the detection connection interface 101 is in the plugged state with the external power supply, that is, the power input terminal Vin receives the charging power, the plug detecting circuit 15 outputs the output from the detecting output terminal 151.
  • the voltage of the charging voltage in the charging power source is proportional to the first detecting signal, wherein the ratio is R2/(R1+2); when the voltage of the power input terminal Vin indicates that the detecting connection interface 101 is disconnected from the external power supply
  • a second detection signal of the potential wherein The ground reference GND has the same reference potential of 0V.
  • the plug detection circuit 15 can further notify the control unit 14 to reset the second switch unit after the external power supply and the connection interface 101 are detached, in addition to accurately notifying the control unit 14 when the external power supply is plugged into the connection interface 101. 112, it is convenient to accurately know that the next external power supply and the connection interface 101 are plugged into the power supply.
  • the plug detecting circuit 15 When the external power supply is plugged into the connection interface 101 and the charging power is supplied, the plug detecting circuit 15 outputs the first detection signal from the detection output 151 to the control unit 14, and at the same time, the control unit 14 receives the fast charging signal. The control unit 14 outputs the first control signal to the first switch control terminal 1123 of the second switching unit 112 such that the first transistor T1 of the second switching unit 112 is in an on state.
  • the maximum voltage after completion of charging in the energy storage unit 13 is also smaller than the charging voltage in the charging power source.
  • the maximum voltage of the rechargeable battery in the energy storage unit 13 is 4.35 V
  • the charging voltage is 5 V.
  • the voltage of the non-inverting terminal IN+ in the first comparing unit 114 is greater than the voltage of the inverting terminal IN-, thereby operating the amplification comparator AMP from
  • the comparison output terminal OUT1 outputs a high potential first comparison signal to the second switching control terminal 1124 of the second switching unit 112, thereby causing the second switching transistor T2 to be in an on state.
  • the first transistor T1 and the second transistor T2 of the second switching unit 112 are both in an on state, and therefore, the conduction signal corresponding to the ground GND reference voltage is transmitted to the first conductive end 1121 through the second conductive end 1122. And transmitting to the first switching unit 110 through the first control end 1103 electrically connected to the first conductive end 1121.
  • the first FET Q1 and the second FET Q2 in the first switching unit 110 are both in an on state under the control of the low-potential conduction signal, that is, the switch module 11 is in a conductive state as a whole. Therefore, the power input terminal Vin is electrically connected to the charging terminal 131 of the energy storage unit 13. At this point, the charging power provided by the external power supply is transmitted to the energy storage unit 13 through the switch module 11 for performing fast charging.
  • the power input terminal Vin is quickly powered off due to the evacuation voltage of the external power supply, and the charging terminal 131 is maintained at
  • the voltage state of the energy storage unit 13 is such that the voltage of the charging terminal 131 is started to be inverted to the power input terminal Vin through the switch module 11 which is still in the on state at this time.
  • the voltage of the charging terminal 131 is greater than the voltage of the power input terminal Vin
  • the voltage of the non-inverting terminal IN+ in the operational amplifier AMP is smaller than the voltage of the inverting terminal IN-
  • the operational amplification comparator AMP outputs a low potential second from the comparison output terminal OUT1. Comparing the signal to the second switch control terminal 1124 of the second switching unit 112, so that the second switching transistor T2 is in an off state, whereby the conduction signal at the low potential stops transmitting to the first switching unit 110, that is, corresponding The off signal is output to the first control terminal 1103 of the first switching unit 110.
  • the first field effect transistor Q1 and the second field effect transistor Q2 in the first switching unit 110 are in an off state under the control of the on signal without a low potential, that is, the corresponding switch module 11 is in the off state as a whole, thereby
  • the power input terminal Vin is electrically disconnected from the charging terminal 131 of the energy storage unit 13, and thus the energy storage unit 13 stops the rapid charging.
  • the switch module 11 When the switch module 11 is in the off state, the power input terminal Vin is completely disconnected from the charging terminal 131, and the voltage of the power input terminal Vin is directly reduced to a reference voltage of 0V.
  • the plug detecting circuit 15 self-detects the output.
  • the terminal 151 outputs a falling detection edge second detection signal from the high potential to the low potential to the control unit 14, wherein the second detection signal further indicates that the external power supply is disconnected from the connection interface 101, and the control unit 14 outputs according to the second detection signal.
  • the second control signal is sent to the first switch control terminal 1123 of the second switch unit 112, so that the first transistor T1 of the second switch unit 112 is in an off state, thereby accurately resetting the second switch unit 112, so as to accurately know the next external
  • the power supply and the connection interface 101 are plugged into the power supply.
  • the charging circuit 10 can quickly pass the second switch after the external power supply and the connection interface 101 are disconnected by comparing the power supply input terminal Vin with the energy storage unit 14 by the first comparison unit in the switch module.
  • the unit 112 controls the first switching unit 110 to be in an off state, thereby preventing the voltage of the energy storage unit 13 from being reversed to the power input terminal Vin, so that the control unit 14 cannot accurately know the accurate state of the power input terminal Vin, and effectively improve the charging circuit 10 and the electronic device. 100 working stability.
  • the charging circuit 10 is notified by the dual detection of the power supply input by the control unit 14 and the first comparison unit 114, that is, the software detection control executed by the control unit 14 and the hardware analog circuit detection control executed by the first comparison unit 114, so that The control of the on and off of the switch module 11 is more accurate, preventing false triggering.
  • the inverted analog electronic components in the energy storage unit 13 are accurately prevented, for example, the operational amplifier AMP of the first comparison unit 110 and the two transistors of the first switching unit 112
  • the components are small and the volume is small, which ensures that the charging circuit 10 is small in volume and simple in control, further ensuring the stability of the operation of the charging circuit 10.

Abstract

A charging circuit and an electronic device. In the charging circuit, when a control unit (14) receives a quick charging signal and a power input end (Vin) receives the charging power, a switch module (11) is controlled to be in a conducted state, so that the power input end (Vin) and an energy storage unit (13) are electrically conducting, and the charging power is transmitted to the energy storage unit (13) through the power input end (Vin) to execute quick charging. When the power input end (Vin) stops receiving the charging power, the switching module (11) is in a cut off state, so the power input end (Vin) and the energy storage unit (13) are electrically disconnected, preventing a power signal of the energy storage unit (13) from flowing backwards to the power input end (Vin).

Description

充电电路与电子装置Charging circuit and electronic device 技术领域Technical field
本发明涉及一种应用于电子装置的充电电路，具体涉及一种快速充电时能够防止电池倒灌的充电电路。The present invention relates to a charging circuit applied to an electronic device, and more particularly to a charging circuit capable of preventing battery backflow during rapid charging.
背景技术Background technique
随着智能电子产品的广泛应用，智能电子产品的耗电量随着使用时间或者运行的程序逐渐增大。除增加智能电子产品电池容量外，针对电池进行快速充电以减小充电时间成为目前较为广泛的电池耗电增加的解决方案。With the widespread use of smart electronic products, the power consumption of smart electronic products has gradually increased with time of use or running programs. In addition to increasing the battery capacity of smart electronic products, fast charging of batteries to reduce charging time has become a solution to the current increase in battery power consumption.
电子装置通过充电电路执行充电，执行快速充电时通常的解决方案为通过充电电路中的开关单元直接将字外部接收到的充电电源(充电电流、充电电压)提供到充电电池中，也即是相对于通过电源管理芯片针对充电电源转换后提供到充电电池的电流进行了提高。现有技术中，当电子装置与外部供电电源通过连接接口插接并且电性连接后，为了方便使用者进行选择，电子设备通常可以依据用户需求来选择执行快充充电或者普通充电，也即是通过设置相应的控制电路依据用户输入的指令来选择执行快速充电或者普通充电。The electronic device performs charging through the charging circuit. The usual solution when performing fast charging is to directly supply the charging power (charging current, charging voltage) received outside the word to the rechargeable battery through the switching unit in the charging circuit, that is, relative The current supplied to the rechargeable battery after being converted by the power management chip for the charging power source is improved. In the prior art, after the electronic device and the external power supply are plugged in and connected through the connection interface, in order to facilitate the user to select, the electronic device can generally select to perform fast charging or normal charging according to the user's needs, that is, The fast charging or normal charging is selected by setting a corresponding control circuit according to an instruction input by the user.
那么，若执行快速充电过程中控制电路若外部供电电源被拔离，也即是电子装置与外部供电电源电性断开，那么充电电池的电压、电流就会通过开关单元倒灌至连接接口，使得连接接口的电压一直保持一定电位，从而使得电子装置中的控制单元无法准确获知此时外部供电电源是否拔离，导致出现误判断或者误触发，从而使得电子装置的工作稳定性较差。Then, if the external power supply is disconnected from the control circuit during the fast charging process, that is, the electronic device is electrically disconnected from the external power supply, the voltage and current of the rechargeable battery are poured back to the connection interface through the switch unit, so that The voltage of the connection interface is always maintained at a certain potential, so that the control unit in the electronic device cannot accurately know whether the external power supply is disconnected at this time, resulting in misjudgment or false triggering, thereby making the working stability of the electronic device poor.
发明内容Summary of the invention
本发明实施例公开了一种稳定性较高的充电电路。The embodiment of the invention discloses a charging circuit with high stability.
进一步，提供一种包括前述充电电路的电子装置。Further, an electronic device including the aforementioned charging circuit is provided.
本发明公开一种充电电路，包括：电源输入端、开关模组、储能单元以及控制单元。电源输入端用于接收充电电源，所述充电电源包括充电电压与充电电流。所述开关模组电性连接所述电源输入端与储能单元之间。所述控制单元 电性连接所述开关模组，当所述控制单元接收到快速充电信号后，并且所述电源输入端接收到所述充电电源时输出第一控制信号所述开关模组。所述开关模组包括第一开关单元、第二开关单元与第一比较单元，其中，当所述电源输入端接收到所述充电电源时，所述第一比较单元输出第一比较信号至所述第二开单元，所述第二开关单元在所述第一控制信号与所述第一比较信号控制下输出导通信号至第一开关单元，所述第一开关单元响应所述导通信号处于导通状态，以使所述电源输入端与所述储能单元处于电性导通，所述充电电源传输至所述储能单元执行快速充电。当电源输入端停止接收所述充电电源时，所述第一比较单元输出第二比较信号至所述第二开单元，所述第二开关单元在所述第二比较信号控制下输出截止信号至第一开关单元，所述第一开关单元响应所述截止信号处于截止状态，以使所述电源输入端与所述储能单元处于电性断开，防止所述储能单元的电源信号倒灌至所述电源输入端。The invention discloses a charging circuit, comprising: a power input end, a switch module, an energy storage unit and a control unit. The power input terminal is configured to receive a charging power source, and the charging power source includes a charging voltage and a charging current. The switch module is electrically connected between the power input end and the energy storage unit. Control unit The switch module is electrically connected, and when the control unit receives the fast charging signal, and the power input receives the charging power, the first control signal is outputted by the switch module. The switch module includes a first switch unit, a second switch unit, and a first comparison unit, wherein when the power input terminal receives the charging power source, the first comparison unit outputs a first comparison signal to the a second opening unit, the second switching unit outputs an on signal to the first switching unit under control of the first control signal and the first comparison signal, and the first switching unit is responsive to the conduction signal In an on state, the power input terminal is electrically connected to the energy storage unit, and the charging power source is transmitted to the energy storage unit to perform fast charging. When the power input terminal stops receiving the charging power source, the first comparison unit outputs a second comparison signal to the second open unit, and the second switch unit outputs a cutoff signal to the second comparison signal control to a first switching unit, wherein the first switching unit is in an off state in response to the off signal, so that the power input end is electrically disconnected from the energy storage unit, and the power signal of the energy storage unit is prevented from being poured to The power input terminal.
本发明还公开一种包括前述充电电路与连接接口的电子装置，所述连接接口包括第一电源引脚，所述第一电源引脚电性连接所述电源输入端，当所述连接接口插接外部供电电源并且接收到所述充电电压时，所述电源输入端接收到所述充电电源；当所述连接接口拔离所述外部供电电源时，所述电源输入端停止接收到所述充电电源。The invention also discloses an electronic device comprising the foregoing charging circuit and a connection interface, the connection interface comprises a first power supply pin, the first power supply pin is electrically connected to the power input end, and when the connection interface is inserted Receiving an external power supply and receiving the charging voltage, the power input receiving the charging power; when the connection interface is disconnected from the external power supply, the power input stops receiving the charging power supply.
相较于现有技术，充电电路通过开关模组中第一比较单元针对电源输入端与储能单元的比较，能够迅速地在外部供电电源与连接接口拔离后通过第二开关单元控制第一开关单元处于截止状态，从而防止储能单元的电压倒灌至电源输入端导致控制单元无法准确获知电源输入端的准确状态，有效提高充电电路与电子装置的工作稳定性。Compared with the prior art, the charging circuit can quickly control the first power supply terminal and the energy storage unit through the first comparison unit in the switch module, and can quickly control the first power supply and the connection interface to be controlled by the second switch unit. The switch unit is in an off state, thereby preventing the voltage of the energy storage unit from being inverted to the power input end, so that the control unit cannot accurately know the accurate state of the power input end, thereby effectively improving the working stability of the charging circuit and the electronic device.
附图说明DRAWINGS
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.
图1为电子装置中充电电路的电路框图； 1 is a circuit block diagram of a charging circuit in an electronic device;
图2为如图1所示开关模组的具体电路结构示意图；2 is a schematic diagram of a specific circuit structure of the switch module shown in FIG. 1;
图3为如图1所示插拔检测电路的具体电路结构示意图。FIG. 3 is a schematic diagram showing a specific circuit structure of the plug detecting circuit shown in FIG. 1.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
下面结合附图具体说明充电电路与电子装置的电路结构与工作过程。The circuit structure and working process of the charging circuit and the electronic device will be specifically described below with reference to the accompanying drawings.
如图1所示，电子装置100包括充电电路10与连接接口101，其中，充电电路10与连接接口101电性连接，连接接口101用于与外部供电电源(图未示)插接或者拔离，当连接接口101与外部供电电源(图未示)插接时，外部供电电源与充电电路10电性连接，并且外部供电电源通过连接接口101提供充电电源至充电电路10；当连接接口101与外部供电电源(图未示)拔离时，外部供电电源与充电电路电性断开，连接接口101停止提供充电电源至充电电路10。其中，充电电源包括充电电压与充电电流。As shown in FIG. 1 , the electronic device 100 includes a charging circuit 10 and a connection interface 101 , wherein the charging circuit 10 is electrically connected to the connection interface 101 , and the connection interface 101 is used for plugging or unplugging with an external power supply (not shown). When the connection interface 101 is plugged into an external power supply (not shown), the external power supply is electrically connected to the charging circuit 10, and the external power supply supplies the charging power to the charging circuit 10 through the connection interface 101; when the connection interface 101 and When the external power supply (not shown) is disconnected, the external power supply is electrically disconnected from the charging circuit, and the connection interface 101 stops supplying the charging power to the charging circuit 10. The charging power source includes a charging voltage and a charging current.
具体地，连接接口101包括第一电源引脚Vbus、第一数据引脚D1与第二数据引脚D2以及接地引脚G1，其中，第一电源引脚Vbus与接地引脚G1配合传输充电电压，第一数据引脚D1与第二数据引脚D2相互配合执行数据传输。本实施例中，连接接口101为通用串行总线接口(Universal Serial Bus，USB)。Specifically, the connection interface 101 includes a first power pin Vbus, a first data pin D1 and a second data pin D2, and a ground pin G1, wherein the first power pin Vbus cooperates with the ground pin G1 to transmit a charging voltage. The first data pin D1 and the second data pin D2 cooperate to perform data transmission. In this embodiment, the connection interface 101 is a Universal Serial Bus (USB).
充电电路10包括电源输入端Vin、开关模组11、充电管理单元12、储能单元13、控制单元14以及插拔检测电路15。The charging circuit 10 includes a power input terminal Vin, a switch module 11, a charge management unit 12, an energy storage unit 13, a control unit 14, and a plug detection circuit 15.
其中，电源输入端Vin电性连接一电源引脚Vbus，用于接收充电电源，所述充电电源包括充电电压与充电电流。The power input terminal Vin is electrically connected to a power pin Vbus for receiving a charging power source, and the charging power source includes a charging voltage and a charging current.
开关模组11电性连接电源输入端Vin与储能单元13的充电端131之间，同时，充电管理单元12电性连接所述电源输入端Vin与储能单元13的充电端131，也即是开关模组11与充电管理单元12相互并联并且电性连接在电源输入端Vin与储能单元13之间，均用于将充电电源传输至储能单元13。其中，开关模组11用于直接将充电电压与充电电流提供至储能单元14，以针对储能单元13执行快速充 电；充电管理单元12用于针对充电电压与充电电流转换处理为第一充电电压与第一充电电流然后提供至储能单元13，其中第一充电电流小于充电电流，以针对储能单元13执行普通充电。储能单元13自充电端131接收充电电源或者经转换处理后的第一充电电压与第一充电电流。本实施例中，储能单元13为锂电池或者镍镉、镍氢、锂离子、铅蓄、铁锂等可充电电池。The switch module 11 is electrically connected between the power input terminal Vin and the charging end 131 of the energy storage unit 13, and the charging management unit 12 is electrically connected to the power input terminal Vin and the charging end 131 of the energy storage unit 13, that is, The switch module 11 and the charge management unit 12 are connected in parallel with each other and electrically connected between the power input terminal Vin and the energy storage unit 13 for transmitting the charging power to the energy storage unit 13. The switch module 11 is configured to directly supply the charging voltage and the charging current to the energy storage unit 14 to perform fast charging for the energy storage unit 13 . The charging management unit 12 is configured to process the charging voltage and the charging current into a first charging voltage and a first charging current and then provide the same to the energy storage unit 13 , wherein the first charging current is smaller than the charging current to perform for the energy storage unit 13 Ordinary charging. The energy storage unit 13 receives the charging power source or the converted first charging voltage and the first charging current from the charging terminal 131. In this embodiment, the energy storage unit 13 is a lithium battery or a rechargeable battery such as nickel cadmium, nickel hydrogen, lithium ion, lead storage, or iron lithium.
开关模组11与充电管理单元12还同时电性连接控制单元14，并且二者在控制单元14控制下不同时处于工作状态，也即是不同时将充电电源传输至储能单元13。当开关模组11处于工作状态时，也即是开模组11处于导通状态时，直接将充电电压与充电电流提供至储能单元14执行快速充电；当充电管理单元12处于工作状态时，将充电电压与充电电流转换处理为第一充电电压与第一充电电流然后提供至储能单元13执行普通充电。其中，需要说明的是，当开关模组11停止工作并且未处于工作状态则表示其处于截止状态。The switch module 11 and the charge management unit 12 are also electrically connected to the control unit 14 at the same time, and both are not in operation under the control of the control unit 14, that is, the charging power source is not simultaneously transmitted to the energy storage unit 13. When the switch module 11 is in the working state, that is, when the open module 11 is in the on state, the charging voltage and the charging current are directly supplied to the energy storage unit 14 to perform fast charging; when the charging management unit 12 is in the working state, The charging voltage and the charging current are converted into a first charging voltage and a first charging current and then supplied to the energy storage unit 13 to perform normal charging. It should be noted that when the switch module 11 stops working and is not in the working state, it indicates that it is in the off state.
插拔检测电路15电性连接电源输入端Vin与控制单元14，通过检测电源输入端Vin的电压来达到检测连接接口101与外部供电电源的插接情况，也即是检测连接接口101与外部供电电源插接或者拔离，然后依据检测情况输出对应的检测信号至控制单元15。The plug-in detection circuit 15 is electrically connected to the power input terminal Vin and the control unit 14, and detects the connection of the connection interface 101 and the external power supply by detecting the voltage of the power input terminal Vin, that is, detecting the connection interface 101 and the external power supply. The power supply is plugged or unplugged, and then the corresponding detection signal is output to the control unit 15 according to the detection condition.
当电源输入端Vin的电压表示检测连接接口101与外部供电电源处于插接状态，也即是电源输入端Vin接收到所述充电电源，插拔检测电路15输出第一检测信号至控制单元14，对应地，控制单元14依据第一检测信号与快速充电信号输出所述第一控制信号。其中，电子装置100响应用户预设的操作生成该快速充电信号。When the voltage of the power input terminal Vin indicates that the detection connection interface 101 is in the plugged state, that is, the power input terminal Vin receives the charging power, the plug detecting circuit 15 outputs the first detection signal to the control unit 14, Correspondingly, the control unit 14 outputs the first control signal according to the first detection signal and the fast charging signal. The electronic device 100 generates the fast charging signal in response to a preset operation by the user.
当电源输入端Vin的电压表示检测连接接口101与外部供电电源处于拔离状态，也即是电源输入端Vin停止接收所述充电电源，并且电源输入端Vin与储能单元14处于电性断开后，插拔检测电路15输出第二检测信号至控制单元14，对应地，控制单元14输出所述第二控制信号至开关模组11，进一步保证开关模组11处于截止状态。可以理解，检测信号包括第一检测信号与第二检测信号。When the voltage of the power input terminal Vin indicates that the detection connection interface 101 and the external power supply are in the disconnected state, that is, the power input terminal Vin stops receiving the charging power, and the power input terminal Vin and the energy storage unit 14 are electrically disconnected. Then, the plug detection circuit 15 outputs the second detection signal to the control unit 14, and correspondingly, the control unit 14 outputs the second control signal to the switch module 11, further ensuring that the switch module 11 is in an off state. It can be understood that the detection signal includes a first detection signal and a second detection signal.
控制单元14同时还接收用户通过操作电子装置100而输入的快速充电信号或者普通充电信号。当插拔检测电路15提供的检测信号表示检测连接接口101与外部供电电源处于插接状态，也即是此时电源输入端Vin接收到充电电源 时，并且控制单元14接收到快速充电信号时，控制单元14输出第一控制信号至开关模组11，开关模组11在所述第一控制信号控制处于工作状态并且执行快速充电；在此过程中，当插拔检测电路15提供的检测信号表示检测连接接口101与外部供电电源处于拔离状态，也即是电源输入端Vin停止接收所述充电电源时，控制单元14输出第二控制信号至开关模组11，开关模组11在所述第二控制信号控制下处于截止状态并且停止工作，电源输入端Vin与充电端131电性断开，从而准确防止储能单元13的电源信号(电压、电流)通过开关模组11倒灌传输至与电源输入端Vin连接的连接接口101中第一电源引脚Vbus，避免由于无法准确检测第一电源引脚Vbus的电压状态而引起的误判断。The control unit 14 also receives a fast charging signal or a normal charging signal that the user inputs by operating the electronic device 100. When the detection signal provided by the plug detecting circuit 15 indicates that the detecting connection interface 101 is in the plugged state with the external power supply, that is, the power input terminal Vin receives the charging power supply at this time. When the control unit 14 receives the fast charging signal, the control unit 14 outputs a first control signal to the switch module 11, and the switch module 11 controls the first control signal to be in an active state and performs fast charging; When the detection signal provided by the plug detecting circuit 15 indicates that the detecting connection interface 101 and the external power supply are in the disconnected state, that is, when the power input terminal Vin stops receiving the charging power, the control unit 14 outputs the second control signal to The switch module 11 and the switch module 11 are in an off state under the control of the second control signal and stop working, and the power input terminal Vin and the charging terminal 131 are electrically disconnected, thereby accurately preventing the power signal (voltage) of the energy storage unit 13 The current is transmitted through the switch module 11 to the first power pin Vbus in the connection interface 101 connected to the power input terminal Vin to avoid erroneous determination caused by the inability to accurately detect the voltage state of the first power pin Vbus.
具体地，请参阅图2，其中，图2为图1所示充电电路的具体电路结构示意图。Specifically, please refer to FIG. 2 , wherein FIG. 2 is a schematic diagram of a specific circuit structure of the charging circuit shown in FIG. 1 .
如图2所示，所述开关模组11包括第一开关单元110、第二开关单元112与第一比较单元114。As shown in FIG. 2 , the switch module 11 includes a first switch unit 110 , a second switch unit 112 , and a first comparison unit 114 .
第一比较单元114电性连接电源输入端Vin与所述充电端131，用于判定所述电源输入端Vin与充电端131的电压的大小，并且依据判定结果输出对应的比较信号，以识别电源输入端Vin是否接收到充电电压，也即是识别外部供电电源与连接接口101处于插接状态并且提供充电电源或者外部供电电源与连接接口101处于拔离状态并且停止提供充电电源。其中，当所述电源输入端Vin的电压大于充电端131的电压时，表示外部供电电源与连接接口101处于插接状态，并且通过电源输入端Vin输入充电电源，从而为充电电路10提供充电电压，第一比较单元114输出第一比较信号；当所述电源输入端Vin的电压小于充电端131的电压时，表示外部供电电源与连接接口101处于拔离状态，电源输入端Vin停止接收充电电压，也即是停止向充电电路10提供充电电源，第一比较单元114输出第二比较信号。所述比较信号包括第一比较信号与第二比较信号。The first comparison unit 114 is electrically connected to the power input terminal Vin and the charging terminal 131 for determining the magnitude of the voltage of the power input terminal Vin and the charging terminal 131, and outputting a corresponding comparison signal according to the determination result to identify the power source. Whether the input terminal Vin receives the charging voltage, that is, it is recognized that the external power supply is in the plugged state with the connection interface 101 and provides the charging power or the external power supply and the connection interface 101 are in the disconnected state and the charging power supply is stopped. Wherein, when the voltage of the power input terminal Vin is greater than the voltage of the charging terminal 131, it indicates that the external power supply and the connection interface 101 are in a plugged state, and the charging power is input through the power input terminal Vin, thereby providing a charging voltage for the charging circuit 10. The first comparison unit 114 outputs a first comparison signal. When the voltage of the power input terminal Vin is lower than the voltage of the charging terminal 131, it indicates that the external power supply and the connection interface 101 are in the disconnected state, and the power input terminal Vin stops receiving the charging voltage. That is, the charging power supply to the charging circuit 10 is stopped, and the first comparison unit 114 outputs the second comparison signal. The comparison signal includes a first comparison signal and a second comparison signal.
第二开关单元112电性连接第一开关单元110、第一比较单元114与控制单元14，用于依据第一比较单元114输出的比较信号与控制单元14输出的控制信号来对应输出导通信号或者截止信号至第一开关单元110，以控制第一开单元110处于导通状态或者截止状态。其中，第二开关单元112接收到所述第一比较单元114输出的第一比较信号以及所述控制单元14输出第一控制信号，所述第 二开关单元112输出导通信号至所述第一开关单元110，以控制第一开关单元110处于导通状态；当所述第二开关单元112接收到所述第一比较单元114输出的第二比较信号时，所述第二开关单元112输出所述截止信号至所述第一开关单元110，以控制第一开关单元110处于截止状态。The second switching unit 112 is electrically connected to the first switching unit 110, the first comparing unit 114 and the control unit 14 for correspondingly outputting an on signal according to the comparison signal output by the first comparing unit 114 and the control signal output by the control unit 14. Or the off signal is sent to the first switching unit 110 to control the first open unit 110 to be in an on state or an off state. The second switching unit 112 receives the first comparison signal output by the first comparison unit 114 and the control unit 14 outputs a first control signal, where the The second switching unit 112 outputs an on signal to the first switching unit 110 to control the first switching unit 110 to be in an on state; and when the second switching unit 112 receives the second output from the first comparison unit 114 When comparing the signals, the second switching unit 112 outputs the cutoff signal to the first switching unit 110 to control the first switching unit 110 to be in an off state.
其中，第一开单元110处于导通状态表示开关模组11整体处于导通状态，第一开单元110处于截止状态表示开关模组11整体处于截止状态。The first open unit 110 is in an on state, indicating that the switch module 11 is in an on state, and the first open unit 110 is in an off state, indicating that the switch module 11 is in an off state as a whole.
第一开关单元110包括第一连接端1101、第二连接端1102与第一控制端1103。其中，第一连接端1101电性连接电源输入端Vin，第二连接端1102电性连接所述充电端131，第一控制端1103电性连接第二开关单元112用于接收所述导通信号或者截止信号。其中，第一开关单元包括第一场效应管Q1、第二场效应管Q2，第一寄生体二极管BD1与第二寄生体二极管BD2。The first switch unit 110 includes a first connection end 1101, a second connection end 1102, and a first control end 1103. The first connection end 1101 is electrically connected to the power input terminal Vin, the second connection end 1102 is electrically connected to the charging end 131, and the first control end 1103 is electrically connected to the second switch unit 112 for receiving the conduction signal. Or cut off the signal. The first switching unit includes a first field effect transistor Q1, a second field effect transistor Q2, a first parasitic body diode BD1 and a second parasitic body diode BD2.
第一场效应管Q1的漏极D电性连接第一连接端1101，第一场效应管Q1的源极S电性连接第二场效应管Q2的源极S，第一场效应管Q1的栅极G电性连接第一控制端1103，第二场效应管Q2的漏极D电性连接第二连接端1102，第二场效应管Q2的栅极G电性连接第一控制端1103。本实施例中，第一场效应管Q1与第二场效应管Q2采用源极对源极的方式串联，从而构成背靠背场效应晶体管开关。The drain D of the first field effect transistor Q1 is electrically connected to the first connection end 1101, and the source S of the first field effect transistor Q1 is electrically connected to the source S of the second field effect transistor Q2, and the first field effect transistor Q1 The gate G is electrically connected to the first control end 1103, the drain D of the second field effect transistor Q2 is electrically connected to the second connection end 1102, and the gate G of the second field effect transistor Q2 is electrically connected to the first control end 1103. In this embodiment, the first field effect transistor Q1 and the second field effect transistor Q2 are connected in series in a source-to-source manner to form a back-to-back field effect transistor switch.
第一寄生体二极管BD1的阳极(未标示)电性连接第一场效应管Q1的漏极D，第一寄生体二极管BD1的阴极(未标示)电性连接第一场效应管Q1的源极S。同理，第二寄生体二极管BD2的阳极(未标示)电性连接第二场效应管Q2的漏极D，第二寄生体二极管BD2的阴极(未标示)电性连接所述第二场效应管Q2的源极S。An anode (not shown) of the first parasitic body diode BD1 is electrically connected to the drain D of the first field effect transistor Q1, and a cathode (not labeled) of the first parasitic body diode BD1 is electrically connected to the source of the first field effect transistor Q1. S. Similarly, the anode (not shown) of the second parasitic body diode BD2 is electrically connected to the drain D of the second field effect transistor Q2, and the cathode (not labeled) of the second parasitic body diode BD2 is electrically connected to the second field effect. The source S of the tube Q2.
第一比较单元114包括运算放大比较器AMP，运算放大比较器AMP包括同相端IN+、反相端IN-与比较输出端OUT1。同相端IN+电性连接电源输入端Vin，反相端IN-电性连接所述充电端131。运算放大比较器AMP用于比较电源输入端Vin与所述储能单元的电压并且依据比较结果自比较输出端OUT1对应输出所述第一比较信号或者第二比较信号。The first comparison unit 114 includes an operational amplification comparator AMP including an in-phase terminal IN+, an inverting terminal IN-, and a comparison output terminal OUT1. The non-inverting terminal IN+ is electrically connected to the power input terminal Vin, and the inverting terminal IN- is electrically connected to the charging terminal 131. The operational amplification comparator AMP is configured to compare the voltage of the power input terminal Vin with the energy storage unit and output the first comparison signal or the second comparison signal from the comparison output terminal OUT1 according to the comparison result.
本实施例中，运算放大比较器AMP的电源驱动端(未标示)接收驱动电压V+，以驱动运算放大器AMP正常工作，另外，运算放大比较器AMP的接地 参考端(未标示)连接至接地端。In this embodiment, the power driving terminal (not shown) of the operational amplification comparator AMP receives the driving voltage V+ to drive the operational amplifier AMP to operate normally, and additionally, the grounding of the operational amplifier AMP The reference terminal (not shown) is connected to the ground.
第二开关单元112包括第一导电端1121、第二导电端1122、第一开关控制端1123与第二开关控制端1124。第一导电端1121电性连接第一开关单元110的第一控制端1103，以用于输出所述导通信号或者所述截止信号至第一开关单元110。第二导电端1122电性连接接地端GND。The second switch unit 112 includes a first conductive end 1121, a second conductive end 1122, a first switch control end 1123 and a second switch control end 1124. The first conductive end 1121 is electrically connected to the first control end 1103 of the first switch unit 110 for outputting the turn-on signal or the cut-off signal to the first switch unit 110. The second conductive end 1122 is electrically connected to the ground GND.
第一开关控制端1121电性连接控制单元14用于接收所述第一控制信号或者第二控制信号。第二开关控制端1122电性连接比较输出端OUT1，用于接收所述第一比较信号或者第二比较信号。The first switch control terminal 1121 is electrically connected to the control unit 14 for receiving the first control signal or the second control signal. The second switch control terminal 1122 is electrically connected to the comparison output terminal OUT1 for receiving the first comparison signal or the second comparison signal.
第二开关单元112还包括第一晶体管T1与第二晶体管T2。第一晶体管T1的基极b电性连接第一开关控制端1123，第一晶体管T1的集电极c电性连接所述第一导电端1121；第一晶体管T1的发射极e电性连接第二晶体管T2的集电极c，第二晶体管T2的基极b电性连接第二开关控制端1124；第二晶体管T2的发射极E电性连接所述第二导电端1122。The second switching unit 112 further includes a first transistor T1 and a second transistor T2. The base b of the first transistor T1 is electrically connected to the first switch control end 1123, and the collector c of the first transistor T1 is electrically connected to the first conductive end 1121; the emitter e of the first transistor T1 is electrically connected to the second The collector c of the transistor T2, the base b of the second transistor T2 is electrically connected to the second switch control terminal 1124; the emitter E of the second transistor T2 is electrically connected to the second conductive terminal 1122.
本实施例中，第一晶体管T1与第二晶体管T2为NPN型晶体管。对应地，第一控制信号为高电平信号，所述第一比较信号为高电平信号，所述第二比较信号为低电平信号。In this embodiment, the first transistor T1 and the second transistor T2 are NPN type transistors. Correspondingly, the first control signal is a high level signal, the first comparison signal is a high level signal, and the second comparison signal is a low level signal.
请参阅图3，其为如图1所示插拔检测电路15的具体电路结构示意图。Please refer to FIG. 3 , which is a schematic diagram of a specific circuit structure of the plug detection circuit 15 shown in FIG. 1 .
插拔检测电路15包括检测输出端151、第一分压电阻R1与第二分压电阻R2。第一分压电阻R1电性连接电源输入端Vin与检测输出端151之间，第二分压电阻R2电性连接检测输出端151与接地端GND之间，检测输出端151电性连接控制单元14。插拔检测电路15通过检测输出端151输出所述第二检测信号或者所述第二检测信号至控制单元14。The plug detecting circuit 15 includes a detecting output terminal 151, a first voltage dividing resistor R1 and a second voltage dividing resistor R2. The first voltage dividing resistor R1 is electrically connected between the power input terminal Vin and the detecting output terminal 151, the second voltage dividing resistor R2 is electrically connected between the detecting output terminal 151 and the grounding terminal GND, and the detecting output terminal 151 is electrically connected to the control unit. 14. The plug detecting circuit 15 outputs the second detection signal or the second detection signal to the control unit 14 through the detection output terminal 151.
具体地，当电源输入端Vin的电压表示检测连接接口101与外部供电电源处于插接状态，也即是电源输入端Vin接收到所述充电电源，插拔检测电路15自检测输出端151输出与充电电源中充电电压呈比例值的电压作为第一检测信号，其中，所述比例值为R2/(R1+2)；当电源输入端Vin的电压表示检测连接接口101与外部供电电源处于拔离状态，也即是电源输入端Vin停止接收所述充电电源，并且电源输入端Vin与储能单元14处于电性断开后，插拔检测电路15自检测输出端151输出与接地端GND相同参考电位的第二检测信号，其中，与接 地端GND相同参考电位为0V。Specifically, when the voltage of the power input terminal Vin indicates that the detection connection interface 101 is in the plugged state with the external power supply, that is, the power input terminal Vin receives the charging power, the plug detecting circuit 15 outputs the output from the detecting output terminal 151. The voltage of the charging voltage in the charging power source is proportional to the first detecting signal, wherein the ratio is R2/(R1+2); when the voltage of the power input terminal Vin indicates that the detecting connection interface 101 is disconnected from the external power supply The state, that is, the power input terminal Vin stops receiving the charging power, and after the power input terminal Vin and the energy storage unit 14 are electrically disconnected, the plug detecting circuit 15 outputs the same reference from the detecting output terminal 151 as the ground GND. a second detection signal of the potential, wherein The ground reference GND has the same reference potential of 0V.
其中，插拔检测电路15除了在外部供电电源与连接接口101插接时准确通知控制单元14外，还能够在外部供电电源与连接接口101拔离后，进一步辅助控制单元14复位第二开关单元112，便于准确获知下一次外部供电电源与连接接口101插接供电。The plug detection circuit 15 can further notify the control unit 14 to reset the second switch unit after the external power supply and the connection interface 101 are detached, in addition to accurately notifying the control unit 14 when the external power supply is plugged into the connection interface 101. 112, it is convenient to accurately know that the next external power supply and the connection interface 101 are plugged into the power supply.
下面结合图1-3，具体说明充电电路的工作过程。The working process of the charging circuit will be specifically described below with reference to FIGS. 1-3.
当外部供电电源插接于连接接口101并且提供充电电源时，插拔检测电路15自检测输出端151输出第一检测信号至控制单元14，与此同时，控制单元14接收到快速充电信号，则控制单元14输出第一控制信号至第二开关单元112的第一开关控制端1123，从而使得第二开关单元112中的第一晶体管T1处于导通状态。When the external power supply is plugged into the connection interface 101 and the charging power is supplied, the plug detecting circuit 15 outputs the first detection signal from the detection output 151 to the control unit 14, and at the same time, the control unit 14 receives the fast charging signal. The control unit 14 outputs the first control signal to the first switch control terminal 1123 of the second switching unit 112 such that the first transistor T1 of the second switching unit 112 is in an on state.
储能单元13中充电完成后的最大电压也小于充电电源中的充电电压，例如，储能单元13中的充电电池的最大电压为4.35V，而充电电压为5V。The maximum voltage after completion of charging in the energy storage unit 13 is also smaller than the charging voltage in the charging power source. For example, the maximum voltage of the rechargeable battery in the energy storage unit 13 is 4.35 V, and the charging voltage is 5 V.
由此，在当外部供电电源插接于连接接口101并且提供充电电源过程中，第一比较单元114中同相端IN+的电压大于反相端IN-的电压，由此，运算放大比较器AMP自比较输出端OUT1输出高电位的第一比较信号至第二开关单元112的第二开关控制端1124，从而使得第二开关晶体管T2处于导通状态。Therefore, in the process of plugging the external power supply into the connection interface 101 and providing the charging power, the voltage of the non-inverting terminal IN+ in the first comparing unit 114 is greater than the voltage of the inverting terminal IN-, thereby operating the amplification comparator AMP from The comparison output terminal OUT1 outputs a high potential first comparison signal to the second switching control terminal 1124 of the second switching unit 112, thereby causing the second switching transistor T2 to be in an on state.
此时，第二开关单元112中的第一晶体管T1与第二晶体管T2均处于导通状态，因此，对应接地端GND参考电压的导通信号通过第二导电端1122传输至第一导电端1121，并且通过与第一导电端1121电性连接的第一控制端1103传输至第一开关单元110。At this time, the first transistor T1 and the second transistor T2 of the second switching unit 112 are both in an on state, and therefore, the conduction signal corresponding to the ground GND reference voltage is transmitted to the first conductive end 1121 through the second conductive end 1122. And transmitting to the first switching unit 110 through the first control end 1103 electrically connected to the first conductive end 1121.
第一开关单元110中的第一场效应管Q1与第二场效应管Q2在低电位的导通信号控制下均处于导通状态，也即是对应使得开关模组11整体处于导通状态，从而使得电源输入端Vin与储能单元13的充电端131电性连接，至此，外部供电电源提供的充电电源通过开关模组11传输至储能单元13为其执行快速充电。The first FET Q1 and the second FET Q2 in the first switching unit 110 are both in an on state under the control of the low-potential conduction signal, that is, the switch module 11 is in a conductive state as a whole. Therefore, the power input terminal Vin is electrically connected to the charging terminal 131 of the energy storage unit 13. At this point, the charging power provided by the external power supply is transmitted to the energy storage unit 13 through the switch module 11 for performing fast charging.
在储能单元13执行快速充电过程中，若外部供电电源自连接接口101拔离从而停止供充电电源时，电源输入端Vin由于外部供电电源的撤离电压迅速掉电，而充电端131还维持在储能单元13的电压状态，那么充电端131的电压通过此时还处于导通状态的开关模组11开始向电源输入端Vin倒灌。 During the fast charging process of the energy storage unit 13, if the external power supply is disconnected from the connection interface 101 to stop the charging power supply, the power input terminal Vin is quickly powered off due to the evacuation voltage of the external power supply, and the charging terminal 131 is maintained at The voltage state of the energy storage unit 13 is such that the voltage of the charging terminal 131 is started to be inverted to the power input terminal Vin through the switch module 11 which is still in the on state at this time.
由于充电端131的电压大于电源输入端Vin的电压，运算放大比较器AMP中同相端IN+的电压小于反相端IN-的电压，运算放大比较器AMP自比较输出端OUT1输出低电位的第二比较信号至第二开关单元112的第二开关控制端1124，从而使得第二开关晶体管T2处于截止状态，由此，处于低电位的导通信号停止传输至第一开关单元110，也即是对应输出截至信号至所述第一开关单元110的第一控制端1103。Since the voltage of the charging terminal 131 is greater than the voltage of the power input terminal Vin, the voltage of the non-inverting terminal IN+ in the operational amplifier AMP is smaller than the voltage of the inverting terminal IN-, and the operational amplification comparator AMP outputs a low potential second from the comparison output terminal OUT1. Comparing the signal to the second switch control terminal 1124 of the second switching unit 112, so that the second switching transistor T2 is in an off state, whereby the conduction signal at the low potential stops transmitting to the first switching unit 110, that is, corresponding The off signal is output to the first control terminal 1103 of the first switching unit 110.
第一开关单元110中的第一场效应管Q1与第二场效应管Q2在没有低电位的导通信号控制下均处于截至状态，也即是对应使得开关模组11整体处于截至状态，从而使得电源输入端Vin与储能单元13的充电端131电性断开，至此，储能单元13停止快速充电。The first field effect transistor Q1 and the second field effect transistor Q2 in the first switching unit 110 are in an off state under the control of the on signal without a low potential, that is, the corresponding switch module 11 is in the off state as a whole, thereby The power input terminal Vin is electrically disconnected from the charging terminal 131 of the energy storage unit 13, and thus the energy storage unit 13 stops the rapid charging.
当开关模组11处于截至状态后，电源输入端Vin完全与充电端131电性断开，电源输入端Vin的电压将直接下降为0V的参考电压，对应地，插拔检测电路15自检测输出端151输出自高电位降低为低电位的下降沿第二检测信号至控制单元14，其中，第二检测信号则进一步表示外部供电电源自连接接口101拔离，控制单元14依据第二检测信号输出第二控制信号至第二开关单元112的第一开关控制端1123，从而使得第二开关单元112中的第一晶体管T1处于截止状态，从而准确复位第二开关单元112，便于准确获知下一次外部供电电源与连接接口101插接供电。When the switch module 11 is in the off state, the power input terminal Vin is completely disconnected from the charging terminal 131, and the voltage of the power input terminal Vin is directly reduced to a reference voltage of 0V. Correspondingly, the plug detecting circuit 15 self-detects the output. The terminal 151 outputs a falling detection edge second detection signal from the high potential to the low potential to the control unit 14, wherein the second detection signal further indicates that the external power supply is disconnected from the connection interface 101, and the control unit 14 outputs according to the second detection signal. The second control signal is sent to the first switch control terminal 1123 of the second switch unit 112, so that the first transistor T1 of the second switch unit 112 is in an off state, thereby accurately resetting the second switch unit 112, so as to accurately know the next external The power supply and the connection interface 101 are plugged into the power supply.
相较于现有技术，充电电路10通过开关模组中第一比较单元针对电源输入端Vin与储能单元14的比较，能够迅速地在外部供电电源与连接接口101拔离后通过第二开关单元112控制第一开关单元110处于截止状态，从而防止储能单元13的电压倒灌至电源输入端Vin，导致控制单元14无法准确获知电源输入端Vin的准确状态，有效提高充电电路10与电子装置100的工作稳定性。Compared with the prior art, the charging circuit 10 can quickly pass the second switch after the external power supply and the connection interface 101 are disconnected by comparing the power supply input terminal Vin with the energy storage unit 14 by the first comparison unit in the switch module. The unit 112 controls the first switching unit 110 to be in an off state, thereby preventing the voltage of the energy storage unit 13 from being reversed to the power input terminal Vin, so that the control unit 14 cannot accurately know the accurate state of the power input terminal Vin, and effectively improve the charging circuit 10 and the electronic device. 100 working stability.
进一步，充电电路10通过控制单元14与第一比较单元114针对电源输入端的双重检测，通知，也即是控制单元14执行的软件检测控制以及第一比较单元114执行的硬件模拟电路检测控制，使得开关模组11的导通与截止的控制更加准确，防止误触发。Further, the charging circuit 10 is notified by the dual detection of the power supply input by the control unit 14 and the first comparison unit 114, that is, the software detection control executed by the control unit 14 and the hardware analog circuit detection control executed by the first comparison unit 114, so that The control of the on and off of the switch module 11 is more accurate, preventing false triggering.
另外，开关模组11中准确防止储能单元13中的倒灌的模拟电子元器件，例如第一比较单元110的运算放大器AMP、第一开关单元112中的2个晶体管的 元件较少且体积均较小，保证了充电电路10体积较小并且控制方式简单，进一步保证了充电电路10工作的稳定性。In addition, in the switch module 11 , the inverted analog electronic components in the energy storage unit 13 are accurately prevented, for example, the operational amplifier AMP of the first comparison unit 110 and the two transistors of the first switching unit 112 The components are small and the volume is small, which ensures that the charging circuit 10 is small in volume and simple in control, further ensuring the stability of the operation of the charging circuit 10.
本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。 The principles and embodiments of the present invention are described herein with reference to specific examples. The description of the above embodiments is only for the purpose of understanding the core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, There is a change in the scope of the present invention and the scope of the application, and the contents of the present specification should not be construed as limiting the invention.

Claims (11)

  1. 一种充电电路，包括：A charging circuit comprising:
    电源输入端，用于接收充电电源，所述充电电源包括充电电压与充电电流；a power input end, configured to receive a charging power source, where the charging power source includes a charging voltage and a charging current;
    开关模组，电性连接所述电源输入端与储能单元之间；a switch module electrically connected between the power input end and the energy storage unit;
    控制单元，电性连接所述开关模组；当所述控制单元接收到快速充电信号后，并且所述电源输入端接收到所述充电电源时输出第一控制信号至所述开关模组，其特征在于，a control unit electrically connected to the switch module; when the control unit receives the fast charge signal, and the power input terminal receives the charging power source, outputs a first control signal to the switch module, Characterized by
    所述开关模组包括第一开关单元、第二开关单元与第一比较单元，其中，The switch module includes a first switch unit, a second switch unit, and a first comparison unit, where
    当所述电源输入端接收到所述充电电源时，所述第一比较单元输出第一比较信号至所述第二开单元，所述第二开关单元在所述第一控制信号与所述第一比较信号控制下输出导通信号至第一开关单元，所述第一开关单元响应所述导通信号处于导通状态，以使所述电源输入端与所述储能单元电性导通，所述充电电源传输至所述储能单元执行快速充电；When the power input terminal receives the charging power source, the first comparing unit outputs a first comparison signal to the second opening unit, and the second switching unit is in the first control signal and the first a comparison signal control output conduction signal to the first switching unit, the first switching unit is in an on state in response to the conduction signal, so that the power input end is electrically connected to the energy storage unit, Transmitting the charging power source to the energy storage unit to perform fast charging;
    当电源输入端停止接收所述充电电源时，所述第一比较单元输出第二比较信号至所述第二开单元，所述第二开关单元在所述第二比较信号控制下输出截止信号至第一开关单元，所述第一开关单元响应所述截止信号处于截止状态，以使所述电源输入端与所述储能单元处于电性断开。When the power input terminal stops receiving the charging power source, the first comparison unit outputs a second comparison signal to the second open unit, and the second switch unit outputs a cutoff signal to the second comparison signal control to a first switching unit, wherein the first switching unit is in an off state in response to the off signal to electrically disconnect the power input terminal from the energy storage unit.
  2. 根据权利要求1所述的充电电路，其特征在于，The charging circuit of claim 1 wherein:
    所述第一开关单元电性连接所述电源输入端与所述储能单元的充电端；The first switch unit is electrically connected to the power input end and the charging end of the energy storage unit;
    所述第一比较单元电性连接所述电源输入端与所述充电端，用于判定所述电源输入端与所述充电端的电压的大小，以识别所述电源输入端是否接收到所述充电电压，当所述电源输入端的电压大于所述充电端的电压时，表示所述电源输入端接收到充电电源，所述第一比较单元输出第一比较信号；当所述电源输入端的电压小于所述充电端的电压时，表示电源输入端停止接收所述充电电源，所述第一比较单元输出第二比较信号；The first comparison unit is electrically connected to the power input end and the charging end, and is configured to determine a magnitude of a voltage of the power input end and the charging end to identify whether the power input end receives the charging a voltage, when the voltage of the power input terminal is greater than the voltage of the charging terminal, indicating that the power input terminal receives the charging power source, the first comparing unit outputs a first comparison signal; when the voltage of the power input terminal is less than the When the voltage of the charging terminal indicates that the power input terminal stops receiving the charging power source, the first comparing unit outputs a second comparison signal;
    所述第二开关单元电性连接所述第一开关单元、所述第一比较单元与所述控制单元，当所述第二开关单元接收到所述第一比较单元输出的第一比较信号以及所述控制单元输出第一控制信号，所述第二开关单元输出导通信号至所述第一开关单元，当所述第二开关单元接收到所述第一比较单元输出的第二比较 信号时，所述第二开关单元输出所述截止信号至所述第一开关单元。The second switch unit is electrically connected to the first switch unit, the first comparison unit, and the control unit, and when the second switch unit receives the first comparison signal output by the first comparison unit, The control unit outputs a first control signal, the second switching unit outputs a conduction signal to the first switching unit, and when the second switching unit receives a second comparison of the output of the first comparison unit The signal is output by the second switching unit to the first switching unit.
  3. 根据权利要求2所述的充电电路，其特征在于，所述第一比较单元包括运算放大比较器，所述运算放大比较器包括同相端、反相端与比较输出端，所述同相端电性连接所述电源输入端，所述反相端电性连接所述充电端，所述运算放大比较器比较所述电源输入端与所述储能单元的电压并且依据比较结果对应输出所述第一比较信号或者第二比较信号。The charging circuit according to claim 2, wherein said first comparing unit comprises an operational amplification comparator, said operational amplification comparator comprising an in-phase terminal, an inverting terminal and a comparison output terminal, said in-phase terminal electrical Connecting the power input end, the inverting end is electrically connected to the charging end, and the operational amplification comparator compares the voltage of the power input end with the energy storage unit and outputs the first according to the comparison result. Compare the signal or the second comparison signal.
  4. 根据权利要求3所述的充电电路，其特征在于，所述第二开关单元包括第一导电端、第二导电端、第一开关控制端与第二开关控制端，所述第一导电端电性连接所述第一开关单元以用于输出所述导通信号或者所述截止信号至所述第一开关单元，所述第二导电端电性连接接地端；所述第一开关控制端电性连接所述控制单元用于接收所述第一控制信号，所述第二开关控制端电性连接所述比较输出端，用于接收所述第一比较信号或者第二比较信号，The charging circuit according to claim 3, wherein the second switching unit comprises a first conductive end, a second conductive end, a first switch control end and a second switch control end, wherein the first conductive end is electrically The first switch unit is connected to the output signal or the cutoff signal to the first switch unit, and the second conductive end is electrically connected to the ground end; the first switch control terminal is electrically connected The control unit is configured to receive the first control signal, and the second switch control terminal is electrically connected to the comparison output for receiving the first comparison signal or the second comparison signal,
    所述第二开关单元还包括第一晶体管与第二晶体管，所述第一晶体管的基极电性连接所述第一开关控制端，所述第一晶体管的集电极电性连接所述第一导电端；所述第一晶体管的发射极电性连接所述第二晶体管的集电极，所述第二晶体管的基极电性连接所述第二开关控制端；所述第二晶体管的发射极电性连接所述第二导电端。The second switching unit further includes a first transistor and a second transistor, wherein a base of the first transistor is electrically connected to the first switch control end, and a collector of the first transistor is electrically connected to the first a conductive end; an emitter of the first transistor is electrically connected to a collector of the second transistor, a base of the second transistor is electrically connected to the second switch control end; and an emitter of the second transistor Electrically connecting the second conductive end.
  5. 根据权利要求4所述的充电电路，其特征在于，所述第一晶体管与所述第二晶体管为NPN型晶体管，所述第一控制信号为高电平信号，所述第一比较信号为高电平信号，所述第二比较信号为低电平信号。The charging circuit according to claim 4, wherein the first transistor and the second transistor are NPN transistors, the first control signal is a high level signal, and the first comparison signal is high a level signal, the second comparison signal being a low level signal.
  6. 根据权利要求4所述的充电电路，其特征在于，所述充电电路还包括插拔检测电路，所述插拔检测电路电性连接于所述电源输入端与所述控制单元之间，用于检测所述电源输入端是否接收所述充电电源，当所述电源输入端接收到所述充电电源，所述插拔检测电路输出第一检测信号至所述控制单元，所述控制单元依据所述第一检测信号与快速充电信号输出所述第一控制信号；当所述电源输入端停止接收所述充电电源，且所述电源输入端与所述储能单元处于电性断开后，所述插拔检测电路输出第二检测信号至所述控制单元，所述控制单元输出所述第二控制信号至所述第二开关单元，以控制所述第二开关单元输出所述截止信号。 The charging circuit of claim 4, wherein the charging circuit further comprises a plug detecting circuit, the plug detecting circuit electrically connected between the power input end and the control unit, Detecting whether the power input terminal receives the charging power source, and when the power input terminal receives the charging power source, the plug detecting circuit outputs a first detection signal to the control unit, and the control unit is configured according to the The first detection signal and the fast charging signal output the first control signal; when the power input terminal stops receiving the charging power source, and the power input end is electrically disconnected from the energy storage unit, The plug detection circuit outputs a second detection signal to the control unit, and the control unit outputs the second control signal to the second switching unit to control the second switching unit to output the cutoff signal.
  7. 据权利要求6所述的充电电路，其特征在于，所述插拔检测电路包括检测输出端、第一分压电阻与第二分压电阻，所述第一分压电阻电性连接所述电源输入端与所述检测输出端之间，所述第二分压电阻电性连接所述检测输出端与所述接地端之间，所述检测输出端电性连接所述第一开关控制端，用于输出所述第二检测信号与所述第二检测信号至所述控制单元。The charging circuit according to claim 6, wherein the plug detecting circuit comprises a detecting output terminal, a first voltage dividing resistor and a second voltage dividing resistor, and the first voltage dividing resistor is electrically connected to the power source. Between the input end and the detection output end, the second voltage dividing resistor is electrically connected between the detection output end and the ground end, and the detection output end is electrically connected to the first switch control end, And configured to output the second detection signal and the second detection signal to the control unit.
  8. 根据权利要求1-7所述的充电电路，其特征在于，所述第一开关单元包括第一连接端、第二连接端与第一控制端，所述第一连接端电性连接所述电源输入端，所述第二连接端电性连接所述充电端，所述第一控制端电性连接所述第二开关单元用于接收所述导通信号或者截止信号，其中，所述第一开关单元包括第一场效应管、第二场效应管，第一寄生体二极管与第二寄生体二极管，The charging circuit according to any one of claims 1-7, wherein the first switching unit comprises a first connecting end, a second connecting end and a first control end, wherein the first connecting end is electrically connected to the power supply An input end, the second connection end is electrically connected to the charging end, and the first control end is electrically connected to the second switching unit for receiving the on signal or the off signal, wherein the first The switching unit includes a first field effect transistor, a second field effect transistor, a first parasitic body diode and a second parasitic body diode,
    所述第一场效应管的漏极电性连接所述第一连接端，所述第一场效应管的源极电性连接所述第二场效应管的源极，所述第一场效应管的栅极电性连接所述第一控制端，所述第二场效应管的漏极电性连接所述第二连接端，所述第二场效应管的栅极电性连接所述第一控制端；The drain of the first FET is electrically connected to the first connection end, and the source of the first FET is electrically connected to the source of the second FET, the first field effect a gate of the tube is electrically connected to the first control end, a drain of the second field effect transistor is electrically connected to the second connection end, and a gate of the second field effect transistor is electrically connected to the first a control terminal;
    第一寄生体二极管的阳极电性连接所述第一场效应管的漏极，第一寄生体二极管的阴极电性连接所述第一场效应管的源极；An anode of the first parasitic body diode is electrically connected to a drain of the first field effect transistor, and a cathode of the first parasitic body diode is electrically connected to a source of the first field effect transistor;
    第二寄生体二极管的阳极电性连接所述第二场效应管的漏极，第二寄生体二极管的阴极电性连接所述第二场效应管的源极。The anode of the second parasitic diode is electrically connected to the drain of the second field effect transistor, and the cathode of the second parasitic diode is electrically connected to the source of the second field effect transistor.
  9. 根据权利要求8所述的充电电路，其特征在于，所述第一场效应管与所述第二场效应管为P型金属氧化物场效应晶体管，所述导通信号为低电平信号，所述截止信号为高电位信号。The charging circuit according to claim 8, wherein the first FET and the second FET are P-type metal oxide field effect transistors, and the turn-on signal is a low-level signal. The cutoff signal is a high potential signal.
  10. 根据权利要求9所述的充电电路，其特征在于，所述充电电路还包括充电管理单元，所述充电管理单元电性连接所述电源输入端、所述控制单元以及所述储能单元，当所述电源输入端接收到所述充电电源并且所述控制单元接收到普通充电信号后，所述控制单元控制所述开关模组处于截止状态以停止将所述充电电压提供至所述储能单元，并且控制所述充电管理单元将所述充电电源转换为第一充电电压与第一充电电流提供至所述储能单元执行普通充电，所述第一充电电流小于所述充电电流。The charging circuit according to claim 9, wherein the charging circuit further comprises a charging management unit, wherein the charging management unit is electrically connected to the power input terminal, the control unit, and the energy storage unit. After the power input terminal receives the charging power source and the control unit receives the normal charging signal, the control unit controls the switch module to be in an off state to stop providing the charging voltage to the energy storage unit. And controlling the charging management unit to convert the charging power source into a first charging voltage and providing a first charging current to the energy storage unit to perform normal charging, the first charging current being less than the charging current.
  11. 一种电子装置，其特征在于，包括根据权利要求10所述的充电电路与 连接接口，所述连接接口包括第一电源引脚，所述第一电源引脚电性连接所述电源输入端，当所述连接接口插接外部供电电源并且接收到所述充电电压时，所述电源输入端接收到所述充电电源；当所述连接接口拔离所述外部供电电源时，所述电源输入端停止接收到所述充电电源。 An electronic device comprising the charging circuit according to claim 10 a connection interface, the connection interface includes a first power pin, the first power pin is electrically connected to the power input, and when the connection interface is plugged into an external power supply and receives the charging voltage, The power input terminal receives the charging power source; when the connection interface is disconnected from the external power supply, the power input terminal stops receiving the charging power source.
PCT/CN2017/115341 2017-12-08 2017-12-08 Charging circuit and electronic device WO2019109361A1 (en)

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JPH08317656A (en) * 1995-05-19 1996-11-29 Nippondenso Co Ltd Rectifying circuit
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CN104092388A (en) * 2014-06-17 2014-10-08 昆山弗尔赛能源有限公司 Synchronous rectifying BOOST circuit with reverse current prevention
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