WO2016192005A1 - 充电电路和移动终端 - Google Patents

充电电路和移动终端 Download PDF

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Publication number
WO2016192005A1
WO2016192005A1 PCT/CN2015/080478 CN2015080478W WO2016192005A1 WO 2016192005 A1 WO2016192005 A1 WO 2016192005A1 CN 2015080478 W CN2015080478 W CN 2015080478W WO 2016192005 A1 WO2016192005 A1 WO 2016192005A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
charging
capacitive coupling
battery
capacitor
Prior art date
Application number
PCT/CN2015/080478
Other languages
English (en)
French (fr)
Inventor
张加亮
Original Assignee
广东欧珀移动通信有限公司
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
Priority to MX2017004677A priority Critical patent/MX360571B/es
Priority to HUE15889425A priority patent/HUE042107T2/hu
Application filed by 广东欧珀移动通信有限公司 filed Critical 广东欧珀移动通信有限公司
Priority to PCT/CN2015/080478 priority patent/WO2016192005A1/zh
Priority to CN201910194446.5A priority patent/CN109888895B/zh
Priority to MA40183A priority patent/MA40183B1/fr
Priority to AU2015397723A priority patent/AU2015397723B2/en
Priority to DK15889425.3T priority patent/DK3139463T3/en
Priority to BR112017010237-4A priority patent/BR112017010237B1/pt
Priority to CA2963509A priority patent/CA2963509C/en
Priority to MYPI2017701982A priority patent/MY182687A/en
Priority to PT15889425T priority patent/PT3139463T/pt
Priority to ES15889425T priority patent/ES2710331T3/es
Priority to US15/306,093 priority patent/US9960623B2/en
Priority to JP2017516508A priority patent/JP6559778B2/ja
Priority to PL15889425T priority patent/PL3139463T3/pl
Priority to KR1020177009193A priority patent/KR102051943B1/ko
Priority to EP15889425.3A priority patent/EP3139463B1/en
Priority to CN201580004529.3A priority patent/CN105940589A/zh
Priority to SG11201702426WA priority patent/SG11201702426WA/en
Priority to TW105117065A priority patent/TW201703386A/zh
Publication of WO2016192005A1 publication Critical patent/WO2016192005A1/zh
Priority to PH12017500721A priority patent/PH12017500721A1/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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0277—Details of the structure or mounting of specific components for a printed circuit board assembly
    • H02J2007/10—
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

Definitions

  • Embodiments of the present invention relate to the field of mobile terminals, and, more particularly, to a charging circuit and a mobile terminal.
  • FIG. 1 shows a circuit diagram of a charging circuit used in a conventional mobile terminal.
  • This circuit diagram is called BUCK circuit and mainly includes: MOS tube, control circuit, diode, inductor and battery.
  • the control circuit controls the turn-on and turn-off of the MOS transistor to generate a varying square wave current that flows from the MOS tube to the inductor and is regulated by the inductor to flow to the battery.
  • the main problem in the prior art, or the risk, is that the MOS tube may be broken down, causing current to pass directly through the inductor, current and voltage check circuit and battery, which will cause the battery to exceed the limit voltage, resulting in catastrophic consequences.
  • the cause of damage to the MOS tube can be:
  • the MOS tube is misdirected, and the voltage applied across the MOS tube exceeds the maximum withstand voltage, electrostatic breakdown or surge of the MOS tube;
  • MOS has many problems, and in order to avoid the above problems and improve the reliability of the MOS tube, the existing solution is to increase the resistance of the MOS transistor's on-resistance (RDSON) to improve the withstand voltage of the MOS tube.
  • RDSON MOS transistor's on-resistance
  • high on-resistance may cause problems such as easy heating of the charging circuit and low energy transmission efficiency.
  • Embodiments of the present invention provide a charging circuit and a mobile terminal to improve reliability of a charging circuit in a mobile terminal.
  • a charging circuit located between a charging interface of a mobile terminal and a battery, comprising: a first circuit connected to the charging interface, wherein the first circuit Receiving, by the charging interface, direct current for charging, and converting direct current provided by the charging interface into alternating current; a second circuit connected to the battery, wherein the second circuit receives the output of the first circuit And alternating current, and converting the alternating current outputted by the first circuit into direct current to charge the battery; and a capacitive coupling element between the first circuit and the second circuit to disconnect the first circuit and a DC path between the second circuits, wherein the capacitive coupling element is configured to couple an alternating current output by the first circuit to the second circuit when the first circuit is operating normally When the first circuit cannot generate an alternating current due to a fault, the direct current output from the first circuit is blocked.
  • the first circuit is specifically configured to: charge and discharge a capacitor in the capacitive coupling component by controlling a switch tube inside the first circuit, Converting the DC power provided by the charging interface into an alternating current.
  • the first circuit in another implementation of the first aspect, includes a bridge arm circuit and a control circuit for controlling the bridge arm circuit, where The control circuit controls the bridge arm circuit to alternately implement charging and discharging of the capacitor.
  • the capacitor in the capacitive coupling component is one of the following capacitors: a capacitor formed by a printed circuit board PCB, And a capacitor formed by a flexible printed circuit FPC board.
  • the size, shape or thickness of the capacitor in the capacitive coupling element is designed based on the structure of the charging circuit of.
  • the first circuit in another implementation of the first aspect, includes a bridge arm circuit including a plurality of metal oxide semiconductor field effects Transistor MOSFET.
  • the second circuit comprises a rectifier circuit and a filter circuit.
  • a mobile terminal comprising a charging interface and a battery, wherein a charging circuit as described in any one of the first aspect or the above-described implementations is provided between the charging interface and the battery.
  • the charging interface is a universal serial bus USB interface.
  • the mobile terminal supports a normal charging mode and a fast charging mode, wherein the charging current of the fast charging mode is greater than the charging current of the normal charging mode.
  • the DC path of the charging line is separated by the capacitive coupling element, that is, there is no DC path on the charging circuit, then, when the first circuit fails, the DC output of the charging interface is not directly output. To the second circuit and the battery, the reliability of the charging circuit is improved.
  • FIG. 1 is a circuit diagram of a charging circuit in the prior art.
  • FIG. 2 is a schematic block diagram of a charging circuit of an embodiment of the present invention.
  • FIG. 3 is a diagram showing an example of a charging circuit of an embodiment of the present invention.
  • FIG. 4 is a diagram showing an example of a charging circuit of an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a mobile terminal according to an embodiment of the present invention.
  • FIG. 2 is a schematic block diagram of a charging circuit of an embodiment of the present invention.
  • the charging circuit 30 of FIG. 2 is disposed between the charging interface 10 of the mobile terminal and the battery 20, and the charging circuit 30 includes:
  • the first circuit 31 is connected to the charging interface 10, wherein the first circuit 31 receives DC power for charging through the charging interface 10, and converts the DC power provided by the charging interface 10 into AC power;
  • a second circuit 32 connected to the battery 20, wherein the second circuit 32 receives the alternating current output by the first circuit 31, and converts the alternating current output by the first circuit 31 into direct current, for the battery 20 charging;
  • a capacitive coupling element 33 between the first circuit 31 and the second circuit 32 to open a DC path between the first circuit 31 and the second circuit 32, wherein the capacitive coupling The component 33 is configured to couple the alternating current outputted by the first circuit 31 to the second circuit 32 when the first circuit 31 operates normally, and block when the first circuit 31 cannot generate an alternating current due to a fault.
  • the direct current output by the first circuit 31 is configured to couple the alternating current outputted by the first circuit 31 to the second circuit 32 when the first circuit 31 operates normally, and block when the first circuit 31 cannot generate an alternating current due to a fault.
  • the DC path of the charging line is separated by the capacitive coupling element, that is, there is no DC path on the charging circuit, then, when the first circuit fails, the DC output of the charging interface is not directly output. To the second circuit and the battery, the reliability of the charging circuit is improved.
  • the charging interface 10 may be a Universal Serial Bus (USB) interface, which may be a normal USB interface or a micro USB interface.
  • USB Universal Serial Bus
  • the battery 20 described above may be a lithium battery.
  • the second circuit 32 described above may function to adjust the current output by the first circuit 31 to a charging current suitable for charging the battery 20.
  • the second circuit 32 may include a rectifying circuit, a filtering circuit, or a voltage stabilizing circuit.
  • the rectifying circuit may be a diode rectifying circuit or a triode rectifying circuit, and specifically refers to a rectifying method of the prior art, which will not be described in detail herein.
  • the second circuit 32 can be used to adjust the alternating current of the first circuit 31 coupled to the second circuit 32 through the capacitive coupling element 33 to a direct current suitable for charging the battery 20.
  • the first circuit 31 converts the DC power provided by the charging interface 10 into an AC power by charging and discharging the capacitor in the capacitive coupling element 33 through the first circuit 31, that is, the first circuit 31 passes certain control logic.
  • the capacitor in the capacitive coupling element 33 is charged and discharged.
  • the control frequency of the control logic reaches a certain level, from the perspective of the capacitor, the output from the first circuit 31 is alternating current, and the capacitor has an alternating current and a blocking direct current. The function of the alternating current is transmitted to the second circuit 32 through the capacitor.
  • the first circuit 31 is specifically configured to: charge and discharge a capacitor in the capacitive coupling component 33 by controlling a switch tube inside the first circuit 31, and charge the capacitor
  • the DC power provided by the interface 10 is converted into an alternating current.
  • a switch tube (such as a MOS tube) is disposed inside the first circuit, and the switch tube is prone to breakdown.
  • the first circuit cannot convert the direct current into an alternating current through the switch tube, resulting in The DC input from the charging interface is directly applied to the subsequent device or battery of the charging circuit
  • a capacitive coupling element is disposed between the first circuit and the second circuit, and the capacitive coupling element disconnects the DC path of the charging circuit, and conducts AC and DC. That is to say, even if the switching tube in the first circuit is broken down or fails, the direct current input from the charging interface cannot flow to the second circuit or the battery, thereby improving the safety of the charging circuit of the mobile terminal.
  • the capacitive coupling element has good isolation performance, the on-resistance of the switching transistor in the first circuit can be made very low (without increasing the on-resistance to increase the MOS tube withstand voltage as in the prior art, Thereby increasing the reliability of the circuit), which reduces heat generation and loss, and improves the energy transfer efficiency of the entire charging circuit.
  • the specific form of the first circuit 31, the number of capacitors in the capacitive coupling element 33, and the connection form of the capacitances in the first circuit 31 and the capacitive coupling element 33 are not specifically limited.
  • the first circuit 31 may be a half bridge circuit or a full bridge circuit; the capacitive coupling element 33 may include one capacitor or two capacitors.
  • the specific form and connection relationship of the above circuits and components enables the first circuit 31 to transfer energy to the second circuit 32 through the capacitive coupling element. The detailed description will be made below in conjunction with specific embodiments.
  • the first circuit 31 may include a bridge arm circuit and a control circuit for controlling the bridge arm circuit, wherein the control circuit controls the bridge arm circuit to implement the Charge and discharge of the capacitor.
  • the first circuit 31 may include a half bridge circuit, and the capacitive coupling element 33 includes a capacitor.
  • the first circuit 31 and the second circuit 32 are common.
  • the first circuit 31 is connected to one end of the capacitor and the ground, and the other end of the capacitor. Grounded through the second circuit and the battery.
  • the first circuit 31 realizes charging of the capacitor and discharging of the capacitor to the ground by controlling the half bridge circuit.
  • the first circuit 31 may comprise a full bridge circuit
  • the capacitive coupling element 33 may comprise two capacitors, the full bridge circuit being respectively connected to the two capacitors, the first circuit 31 alternately changing the two capacitors by controlling the full bridge circuit The direction of the voltage.
  • control circuit can be powered in various ways, for example, can be powered by a charging current or by a power source inside the mobile terminal.
  • the capacitor in the capacitive coupling component is one of the following capacitors: a capacitor formed by a printed circuit board (PCB), and a flexible printed circuit (FPC).
  • PCB printed circuit board
  • FPC flexible printed circuit
  • the capacitance of the board is designed based on the structure of the mobile terminal.
  • the capacitance formed by the PCB board can be made by using the PCB board and the copper foil above.
  • the capacitor formed by the FPC board can be a capacitor specially designed by FPC.
  • the advantages of the capacitance of the PCB board and the capacitance of the FPC board are: it can be designed into any shape, any size, any thickness, and can be freely designed according to the structure and shape of the terminal such as a mobile phone.
  • the first circuit 31 may include a bridge arm circuit including a plurality of metal oxide semiconductor field effect transistor MOSFETs.
  • the second circuit may include a rectifier circuit and a filter circuit.
  • the first circuit 31 can include a control circuit 311 and a half bridge circuit 312, wherein the half bridge circuit 312 can include a switch tube T1 and a switch tube T2.
  • the capacitive coupling element 33 can include a capacitor C1.
  • the control circuit 311 can alternately control the operation of the switching tube T1 and the switching tube T2 to realize charging and discharging of the capacitor C1, thereby converting the direct current into alternating current, and flowing through the capacitor C1 to the second circuit 32 and the battery 20.
  • the control circuit 311 can first control the switch tube T1 to be turned on, and the switch tube T2 is turned off. At this time, the DC power input from the charging interface 10 charges the capacitor C1 through the switch tube T1; The circuit 311 can control the switch tube T1 to be turned off, and the switch tube T2 is turned on. Since the first circuit 31 and the second circuit 32 are common, the capacitor C1 is discharged to the ground. The control circuit 311 repeatedly controls the operation of the half bridge circuit as described above to form an alternating current that can pass through the capacitor C1.
  • the capacitor C1 prevents the direct current output from the charging interface 10 from flowing directly to the second circuit 32 and the battery, thereby improving the reliability of the charging circuit.
  • the first circuit 31 can include a control circuit 313 and a full bridge circuit 314, wherein the full bridge circuit 314 can include a switch tube T1, a switch tube T2, a switch tube T3, and a switch tube T4.
  • the capacitive coupling element 33 includes a capacitor C1 and a capacitor C2.
  • the control circuit 313 can first control the operation of the switch tube T1 and the switch tube T4, and then control the switch tube T2 and the switch tube T4 to alternately change the direction of the voltage in the capacitor C1 and the capacitor C2, thereby converting the direct current into The alternating current flows through the capacitor C1 and the capacitor C2 to the second circuit 32 and the battery 20.
  • the control circuit 311 can first control the switch tube T1 and the switch tube T4 to be turned on, and the switch tube T2 and the switch tube T3 are disconnected. At this time, the charging interface 10 inputs the straight The galvanic current will form a loop through the switch tube T1, the capacitor C2, the capacitor C1, and the switch tube T4 to the ground; then, the control circuit 311 can control the switch tube T1 and the switch tube T4 to be disconnected, and the switch tube T2 and the switch tube T3 are turned on.
  • the control circuit 311 repeatedly controls the operation of the full-bridge circuit as described above, and forms an alternating current that can pass through the capacitor C1 and the capacitor C2.
  • the capacitor C1 and the capacitor C2 prevent the direct current output from the charging interface 10 from flowing directly to the second circuit 32 and the battery, thereby improving the reliability of the charging circuit.
  • FIG. 5 is a schematic block diagram of a mobile terminal according to an embodiment of the present invention.
  • the mobile terminal 50 includes a charging interface 51, a battery 52, and a charging circuit 53, wherein the charging circuit 53 can adopt any one of the above-described charging circuits 30.
  • the DC path of the charging line is separated by the capacitive coupling element, that is, there is no DC path on the charging circuit, then, when the first circuit fails, the DC output of the charging interface is not directly output. To the second circuit and the battery, the reliability of the charging circuit is improved.
  • the charging interface 51 is a USB interface.
  • the mobile terminal 50 supports a normal charging mode and a fast charging mode, wherein the charging current of the fast charging mode is greater than the charging current of the normal charging mode.
  • the mobile terminal using the embodiment of the present invention can well solve the problem that the line is unreliable due to MOS breakdown during fast charging. .
  • the embodiment of the invention further provides a charging circuit, the charging circuit is configured to receive direct current and charge the battery, and the charging circuit comprises:
  • a first circuit connected to the input end of the direct current, converting the direct current provided by the charging interface into alternating current
  • a second circuit connected to the battery, wherein the second circuit receives the alternating current output by the first circuit, and converts the alternating current output by the first circuit into direct current to charge the battery;
  • a capacitive coupling element between the first circuit and the second circuit to open a DC path between the first circuit and the second circuit, wherein the capacitive coupling element is used in
  • the first circuit operates normally, the alternating current outputted by the first circuit is coupled to the second circuit, and when the first circuit is unable to generate alternating current due to a fault, the direct current output by the first circuit is blocked.
  • the DC path of the charging line is disconnected by the capacitive coupling element, that is, the input DC power cannot directly flow to the battery, and then, when the first circuit fails, the DC output of the charging interface is capacitively coupled. The component is blocked and will not cause damage to the battery.
  • the first circuit is specifically configured to: charge and discharge a capacitor in the capacitive coupling component by controlling a switch tube inside the first circuit, and provide the charging interface DC power is converted into alternating current.
  • the first circuit includes a bridge arm circuit and a control circuit for controlling the bridge arm circuit, wherein the control circuit controls the bridge arm circuit to alternately implement charging of the capacitor Discharge.
  • the capacitor in the capacitive coupling element is one of the following capacitors: a capacitor formed by the printed circuit board PCB, and a capacitor formed by the flexible printed circuit FPC board.
  • the first circuit comprises a bridge arm circuit
  • the bridge arm circuit comprises a plurality of metal oxide semiconductor field effect transistor MOSFETs.
  • the second circuit comprises a rectifier circuit and a filter circuit.
  • the charging circuit is used for a mobile terminal.
  • the size, shape or thickness of the capacitance in the capacitive coupling element is designed based on the structure of the mobile terminal.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division, and may be implemented in actual implementation.
  • multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Engineering & Computer Science (AREA)
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Abstract

一种充电电路（30）和移动终端，包括：第一电路（31），与充电接口（10）相连，其中，第一电路（31）通过充电接口（10）接收用于充电的直流电，并将充电接口（10）提供的直流电转换成交流电；第二电路（32），与电池（20）相连，其中，第二电路（32）接收第一电路（31）输出的交流电，并将第一电路（31）输出的交流电转换成直流电，为电池（20）充电；电容耦合元件（33），位于第一电路（31）和第二电路（32）之间。通过电容耦合元件（33）将充电线路的直流通路隔开，也就是说，充电电路（30）上不存在直流通路，那么，在第一电路（31）失效时，充电接口（10）输出的直流电就不会直接输出至第二电路（32）和电池（20）上，提高了充电电路（30）的可靠性。

Description

充电电路和移动终端 技术领域
本发明实施例涉及移动终端领域，并且更具体地，涉及一种充电电路和移动终端。
背景技术
移动终端的使用越来越普及，移动终端的充电问题成为移动终端提供商重点关注的问题。
图1示出了现有的移动终端所使用的充电电路的电路图。该电路图称为BUCK电路，主要包括：MOS管，控制电路，二极管，电感和电池。充电时，控制电路控制MOS管的导通与关断，产生变化的方波电流，该方波电流从MOS管流到电感，经电感稳压后流到电池。
现有技术存在的主要问题，或者说风险在于，MOS管可能会被击穿，造成电流直接通过电感，电流电压检查电路及电池，这样会造成电池超过极限电压，导致灾难性的后果。
造成MOS管损坏的原因可以是：
1、MOS管误导通，施加在MOS管两端的电压超过了MOS管的最大可承受电压、静电击穿或浪涌；
2、MOS管品质不良，或整机制造工艺问题；
3、其他缺陷等。
正因为MOS存在较多问题，也为了避免上述问题，提高MOS管的可靠性，现有的解决方案是：增加MOS管的导通电阻(RDSON)的阻值，以提高MOS管的耐压性，但导通电阻很高会导致充电电路容易发热，能量传输效率低等问题。
发明内容
本发明实施例提供一种充电电路和移动终端，以提高移动终端内的充电电路的可靠性。
第一方面，提供一种充电电路，所述充电电路位于移动终端的充电接口和电池之间，包括：第一电路，与所述充电接口相连，其中，所述第一电路 通过所述充电接口接收用于充电的直流电，并将所述充电接口提供的直流电转换成交流电；第二电路，与所述电池相连，其中，所述第二电路接收所述第一电路输出的交流电，并将所述第一电路输出的交流电转换成直流电，为所述电池充电；电容耦合元件，位于所述第一电路和所述第二电路之间，以断开所述第一电路和所述第二电路之间的直流通路，其中，所述电容耦合元件用于在所述第一电路正常工作时，将所述第一电路输出的交流电耦合至所述第二电路，在所述第一电路因故障而无法生成交流电时，阻挡所述第一电路输出的直流电。
结合第一方面，在第一方面的一种实现方式中，所述第一电路具体用于：通过控制所述第一电路内部的开关管，对所述电容耦合元件中的电容进行充放电，将所述充电接口提供的直流电转换成交流电。
结合第一方面或其上述实现方式的任一种，在第一方面的另一种实现方式中，所述第一电路包括桥臂电路和用于控制所述桥臂电路的控制电路，其中，所述控制电路控制所述桥臂电路交替实现所述电容的充放电。
结合第一方面或其上述实现方式的任一种，在第一方面的另一种实现方式中，所述电容耦合元件中的电容为以下电容中的一种：印刷电路板PCB构成的电容，以及柔性印刷电路FPC板构成的电容。
结合第一方面或其上述实现方式的任一种，在第一方面的另一种实现方式中，所述电容耦合元件中的电容的尺寸、形状或厚度是基于所述充电电路的结构而设计的。
结合第一方面或其上述实现方式的任一种，在第一方面的另一种实现方式中，所述第一电路包括桥臂电路，所述桥臂电路包括多个金属氧化层半导体场效应晶体管MOSFET。
结合第一方面或其上述实现方式的任一种，在第一方面的另一种实现方式中，所述第二电路包括整流电路和滤波电路。
第二方面，提供一种移动终端，包括充电接口和电池，其中，在所述充电接口和所述电池之间设置有如第一方面或其上述实现方式的任一种中描述的充电电路。
结合第二方面，在第二方面的一种实现方式中，所述充电接口为通用串行总线USB接口。
结合第二方面或其上述实现方式的任一种，在第二方面的另一种实现方 式中，所述移动终端支持普通充电模式和快速充电模式，其中，所述快速充电模式的充电电流大于所述普通充电模式的充电电流。
本发明实施例中，通过电容耦合元件将充电线路的直流通路隔开，也就是说，充电电路上不存在直流通路，那么，在第一电路失效时，充电接口输出的直流电就不会直接输出至第二电路和电池上，提高了充电电路的可靠性。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述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的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术中的充电电路的电路图。
图2是本发明实施例的充电电路的示意性框图。
图3是本发明实施例的充电电路的示例图。
图4是本发明实施例的充电电路的示例图。
图5是本发明实施例的移动终端的示意性框图。
具体实施方式
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，所描述的实施例是本发明的一部分实施例，而不是全部实施例。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的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
图2是本发明实施例的充电电路的示意性框图。图2的充电电路30设置在移动终端的充电接口10和电池20之间，所述充电电路30包括：
第一电路31，与所述充电接口10相连，其中，所述第一电路31通过所述充电接口10接收用于充电的直流电，并将所述充电接口10提供的直流电转换成交流电；
第二电路32，与所述电池20相连，其中，所述第二电路32接收所述第一电路31输出的交流电，并将所述第一电路31输出的交流电转换成直流电，为所述电池20充电；
电容耦合元件33，位于所述第一电路31和所述第二电路32之间，以断开所述第一电路31和所述第二电路32之间的直流通路，其中，所述电容耦合元件33用于在所述第一电路31正常工作时，将所述第一电路31输出的交流电耦合至所述第二电路32，在所述第一电路31因故障而无法生成交流电时，阻挡所述第一电路31输出的直流电。
本发明实施例中，通过电容耦合元件将充电线路的直流通路隔开，也就是说，充电电路上不存在直流通路，那么，在第一电路失效时，充电接口输出的直流电就不会直接输出至第二电路和电池上，提高了充电电路的可靠性。
应理解，所述充电接口10可以为通用串行总线(Universal Serial Bus，USB)接口，该USB接口可以是普通的USB接口，或micro USB接口。此外，还应理解，上述电池20可以是锂电池。
应理解，上述第二电路32的作用可以是将第一电路31输出的电流调整成适合为电池20充电的充电电流。第二电路32可以包括整流电路、滤波电路或稳压电路等，该整流电路可以是二极管整流电路或三极管整流电路，具体参照现有技术的整流方式，此处不再详述。
应理解，所述第二电路32可用于将所述第一电路31通过所述电容耦合元件33耦合至第二电路32的交流电调整成适于为所述电池20充电的直流电。
需要说明的是，第一电路31将充电接口10提供的直流电转换成交流电可以是通过第一电路31对电容耦合元件33中的电容进行充放电实现的，即第一电路31通过一定的控制逻辑实现对电容耦合元件33中的电容进行充放电，当该控制逻辑的控制频率达到一定程度时，从电容的角度来看，从第一电路31输出的是交流电，而电容具有通交流、阻直流的功能，该交流电就会通过电容传至第二电路32。
可选地，作为一个实施例，所述第一电路31具体用于：通过控制所述第一电路31内部的开关管，对所述电容耦合元件33中的电容进行充放电，将所述充电接口10提供的直流电转换成交流电。
本发明实施例中，第一电路内部设置有开关管(如MOS管)，开关管容易发生击穿，当开关管发生击穿时，第一电路就无法通过开关管将直流转换成交流，导致充电接口输入的直流电直接施加到充电电路的后续器件或电池 上，但是，本发明实施例在第一电路和第二电路之间设置了电容耦合元件，该电容耦合元件将充电电路的直流通路断开，通交流、阻直流。也就是说，即使第一电路中的开关管被击穿或失效，充电接口输入的直流电也无法流到第二电路或电池处，从而提高了移动终端充电电路的安全性。
此外，由于电容耦合元件具有很好的隔离性能，第一电路中的开关管的导通电阻就可以做的很低(无需像现有技术那样通过增加导通电阻来增加MOS管耐压性，从而增加电路的可靠性)，这样会减少发热和损耗，提高整个充电电路的能量传递效率。
应注意，本发明实施例对第一电路31的具体形式，电容耦合元件33中的电容的数量，以及第一电路31和电容耦合元件33中的电容的连接形式不作具体限定。例如，第一电路31可以是半桥电路，也可以是全桥电路；电容耦合元件33可以包括一个电容，也可以包括两个电容。实际上，只要以上电路和元件的具体形式和连接关系能够实现第一电路31通过电容耦合元件将能量传递至第二电路32即可。下文会结合具体的实施例进行详细描述。
可选地，作为一个实施例，所述第一电路31可包括桥臂电路和用于控制所述桥臂电路的控制电路，其中，所述控制电路控制所述桥臂电路动作，实现所述电容的充放电。例如，第一电路31可包括半桥电路，电容耦合元件33包括一个电容，第一电路31和第二电路32共地，该第一电路31分别与电容的一端和地相连，电容的另一端通过第二电路和电池接地。第一电路31通过控制半桥电路，实现电容的充电以及电容对地的放电。或者，第一电路31可以包括全桥电路，电容耦合元件33可以包括两个电容，该全桥电路分别与该两个电容相连，第一电路31通过控制全桥电路，交替改变两个电容的电压的方向。
需要说明的是，控制电路的取电方式可以有多种，例如，可以由充电电流供电，也可以由移动终端内部的电源供电。
可选地，作为一个实施例，所述电容耦合元件中的电容为以下电容中的一种：印刷电路板(Printed Circuit Board，PCB)构成的电容，以及柔性印刷电路(Flexible Printed Circuit，FPC)板构成的电容。可选地，作为一个实施例，所述电容耦合元件中的电容的尺寸、形状或厚度是基于所述移动终端的结构而设计的。
具体地，PCB板构成的电容可以是利用PCB板材以及上面的铜箔特意 构成的电容；FPC板构成的电容可以是利用FPC特意设计构成的电容。PCB板构成的电容及FPC板构成的电容的好处主要有：可以设计成任意形状，任意大小，任意厚度，可以根据手机等终端的结构及形状随意设计。
可选地，作为一个实施例，所述第一电路31可包括桥臂电路，所述桥臂电路包括多个金属氧化层半导体场效应晶体管MOSFET。
可选地，作为一个实施例，所述第二电路可包括整流电路和滤波电路。
下面结合具体例子，更加详细地描述本发明实施例。应注意，图3至图4的例子仅仅是为了帮助本领域技术人员理解本发明实施例，而非要将本发明实施例限于所例示的具体数值或具体场景。本领域技术人员根据所给出的图3至图4的例子，显然可以进行各种等价的修改或变化，这样的修改或变化也落入本发明实施例的范围内。
举例说明，参见图3，第一电路31可包括控制电路311和半桥电路312，其中，半桥电路312可包括开关管T1和开关管T2。电容耦合元件33可包括电容C1。在充电的过程中，控制电路311可交替控制开关管T1和开关管T2动作，实现对电容C1的充放电，从而将直流电转换为交流电，经过电容C1流至第二电路32和电池20。
具体而言，在充电的过程中，控制电路311可以先控制开关管T1导通，开关管T2断开，此时，充电接口10输入的直流电会经过开关管T1对电容C1充电；然后，控制电路311可以控制开关管T1断开，开关管T2导通，由于第一电路31和第二电路32共地，电容C1会对地放电。控制电路311按照上述方式反复控制半桥电路动作，就会形成能够经过电容C1的交流电。
如果半桥电路312中的开关管被击穿，电容C1会阻止充电接口10输出的直流电直接流到第二电路32和电池，从而提高了充电电路的可靠性。
再举一例，参见图4。第一电路31可包括控制电路313和全桥电路314，其中，全桥电路314可包括开关管T1、开关管T2、开关管T3和开关管T4。电容耦合元件33包括电容C1和电容C2。在充电的过程中，控制电路313可先控制开关管T1和开关管T4动作，再控制开关管T2和开关管T4动作，交替改变电容C1和电容C2中的电压的方向，从而将直流电转换为交流电，经过电容C1和电容C2流至第二电路32和电池20。
具体而言，在充电的过程中，控制电路311可以先控制开关管T1和开关管T4导通，开关管T2和开关管T3断开，此时，充电接口10输入的直 流电会经过开关管T1、电容C2、电容C1、开关管T4到地形成回路；然后，控制电路311可以控制开关管T1和开关管T4断开，开关管T2和开关管T3导通，此时，充电接口10输入的直流电会经过开关管T3、电容C1、电容C2、开关管T2到地形成回路。控制电路311按照上述方式反复控制全桥电路动作，就会形成能够经过电容C1和电容C2的交流电。
如果全桥电路314中的开关管被击穿，电容C1和电容C2会阻止充电接口10输出的直流电直接流到第二电路32和电池，从而提高了充电电路的可靠性。
图5是本发明实施例提供的一种移动终端的示意性框图。移动终端50包括充电接口51、电池52、以及充电电路53，其中，所述充电电路53可以采用上述充电电路30的任意一种实现方式。
本发明实施例中，通过电容耦合元件将充电线路的直流通路隔开，也就是说，充电电路上不存在直流通路，那么，在第一电路失效时，充电接口输出的直流电就不会直接输出至第二电路和电池上，提高了充电电路的可靠性。
可选地，作为一个实施例，所述充电接口51为USB接口。
可选地，作为一个实施例，所述移动终端50支持普通充电模式和快速充电模式，其中，所述快速充电模式的充电电流大于所述普通充电模式的充电电流。
应理解，MOS管被击穿的现象在支持快速充电的移动终端中尤文严重，因此，采用本发明实施例的移动终端可以很好的解决快速充电时的MOS击穿导致的线路不可靠的问题。
本发明实施例还提供一种充电电路，所述充电电路用于接收直流电，为电池充电，所述充电电路包括：
第一电路，与所述直流电的输入端相连，将所述充电接口提供的直流电转换成交流电；
第二电路，与所述电池相连，其中，所述第二电路接收所述第一电路输出的交流电，并将所述第一电路输出的交流电转换成直流电，为所述电池充电；
电容耦合元件，位于所述第一电路和所述第二电路之间，以断开所述第一电路和所述第二电路之间的直流通路，其中，所述电容耦合元件用于在所 述第一电路正常工作时，将所述第一电路输出的交流电耦合至所述第二电路，在所述第一电路因故障而无法生成交流电时，阻挡所述第一电路输出的直流电。
本发明实施例中，通过电容耦合元件将充电线路的直流通路断开，也就是说，输入的直流电无法直接流向电池，那么，在第一电路失效时，充电接口输出的直流电就会被电容耦合元件阻挡下来，不会对电池造成损害。
可选地，作为一个实施例，所述第一电路具体用于：通过控制所述第一电路内部的开关管，对所述电容耦合元件中的电容进行充放电，将所述充电接口提供的直流电转换成交流电。
可选地，作为一个实施例，所述第一电路包括桥臂电路和用于控制所述桥臂电路的控制电路，其中，所述控制电路控制所述桥臂电路交替实现所述电容的充放电。
可选地，作为一个实施例，所述电容耦合元件中的电容为以下电容中的一种：印刷电路板PCB构成的电容，以及柔性印刷电路FPC板构成的电容。
可选地，作为一个实施例，所述第一电路包括桥臂电路，所述桥臂电路包括多个金属氧化层半导体场效应晶体管MOSFET。
可选地，作为一个实施例，所述第二电路包括整流电路和滤波电路。
可选地，作为一个实施例，所述充电电路用于移动终端。此外，可选地，作为一个实施例，所述电容耦合元件中的电容的尺寸、形状或厚度是基于所述移动终端的结构而设计的。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可 以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应所述以权利要求的保护范围为准。

Claims (10)

  1. 一种充电电路，其特征在于，所述充电电路位于移动终端的充电接口和电池之间，包括：
    第一电路，与所述充电接口相连，其中，所述第一电路通过所述充电接口接收用于充电的直流电，并将所述充电接口提供的直流电转换成交流电；
    第二电路，与所述电池相连，其中，所述第二电路接收所述第一电路输出的交流电，并将所述第一电路输出的交流电转换成直流电，为所述电池充电；
    电容耦合元件，位于所述第一电路和所述第二电路之间，以断开所述第一电路和所述第二电路之间的直流通路，其中，所述电容耦合元件用于在所述第一电路正常工作时，将所述第一电路输出的交流电耦合至所述第二电路，在所述第一电路因故障而无法生成交流电时，阻挡所述第一电路输出的直流电。
  2. 如权利要求1所述的充电电路，其特征在于，所述第一电路具体用于：通过控制所述第一电路内部的开关管，对所述电容耦合元件中的电容进行充放电，将所述充电接口提供的直流电转换成交流电。
  3. 如权利要求2所述的充电电路，其特征在于，所述第一电路包括桥臂电路和用于控制所述桥臂电路的控制电路，其中，所述控制电路控制所述桥臂电路交替实现所述电容的充放电。
  4. 如权利要求1-3中任一项所述的充电电路，其特征在于，所述电容耦合元件中的电容为以下电容中的一种：印刷电路板PCB构成的电容，以及柔性印刷电路FPC板构成的电容。
  5. 如权利要求1-4中任一项所述的充电电路，其特征在于，所述电容耦合元件中的电容的尺寸、形状或厚度是基于所述充电电路的结构而设计的。
  6. 如权利要求1-5中任一项所述的充电电路，其特征在于，所述第一电路包括桥臂电路，所述桥臂电路包括多个金属氧化层半导体场效应晶体管MOSFET。
  7. 如权利要求1-6中任一项所述的充电电路，其特征在于，所述第二电路包括整流电路和滤波电路。
  8. 一种移动终端，包括充电接口和电池，其中，在所述充电接口和所 述电池之间设置有如权利要求1-7中任一项所述的充电电路。
  9. 如权利要求8所述的移动终端，其特征在于，所述充电接口为通用串行总线USB接口。
  10. 如权利要求8或9所述的移动终端，其特征在于，所述移动终端支持普通充电模式和快速充电模式，其中，所述快速充电模式的充电电流大于所述普通充电模式的充电电流。
PCT/CN2015/080478 2015-06-01 2015-06-01 充电电路和移动终端 WO2016192005A1 (zh)

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