WO2020062481A1 - 无线充电接收装置、充电系统及终端 - Google Patents

无线充电接收装置、充电系统及终端 Download PDF

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Publication number
WO2020062481A1
WO2020062481A1 PCT/CN2018/115420 CN2018115420W WO2020062481A1 WO 2020062481 A1 WO2020062481 A1 WO 2020062481A1 CN 2018115420 W CN2018115420 W CN 2018115420W WO 2020062481 A1 WO2020062481 A1 WO 2020062481A1
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WIPO (PCT)
Prior art keywords
current
conversion chip
capacitor conversion
chip
power source
Prior art date
Application number
PCT/CN2018/115420
Other languages
English (en)
French (fr)
Inventor
马强
Original Assignee
北京小米移动软件有限公司
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 北京小米移动软件有限公司 filed Critical 北京小米移动软件有限公司
Priority to RU2019127409A priority Critical patent/RU2733214C1/ru
Priority to KR1020197019707A priority patent/KR102207502B1/ko
Priority to JP2019537374A priority patent/JP6949121B2/ja
Publication of WO2020062481A1 publication Critical patent/WO2020062481A1/zh

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    • H02J7/025—
    • 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
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • 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
    • 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
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps

Definitions

  • the present disclosure relates to the field of terminals, and in particular, to a wireless charging receiving device, a charging system, and a terminal.
  • a wireless charging receiving device is provided inside the terminal, and a coil is provided inside the wireless charging receiving device and the wireless charging transmitting device.
  • An electromagnetic field is generated when the current in the wireless charging transmitting device flows through the charging coil, and when the coil of the wireless charging receiving device is close to the electromagnetic field, a current is generated inside the wireless charging receiving device, so that the terminal is charged by converting between the current and the electromagnetic field.
  • the input voltage of the battery of the terminal is small, such as 4V.
  • the output voltage of the wireless charging transmitting device is usually high, and the step-down conversion circuit provided inside the wireless charging receiving device and the wireless charging transmitting device ( BUCK circuit) to complete the voltage conversion.
  • the present disclosure provides a wireless charging receiving device, a charging system, and a terminal.
  • a wireless charging receiving device including: a receiving coil, a receiving chip, and a switched capacitor conversion chip; and a receiving coil for coupling an alternating magnetic field of a transmitting coil of a wireless charging transmitting device to obtain AC power supply; the input end of the receiving chip is coupled to the receiving coil, and the output end of the receiving chip is coupled to the input end of the switched-capacitor conversion chip for converting AC power to a first DC power supply; the output end of the switched-capacitor conversion chip Coupled to the battery for outputting a second DC power source based on the first DC power source and charging the battery based on the second DC power source, the voltage of the second DC power source is lower than the voltage of the first DC power source, and the second DC power source The current is higher than that of the first DC power source.
  • the switched-capacitor conversion chip includes a first-stage switched-capacitor conversion chip and a second-stage switched-capacitor conversion chip;
  • the wireless charging receiving device further includes: a power management chip PMIC; The input terminal is coupled to the receiving chip, the output terminal of the first-stage switched capacitor conversion chip is coupled to the input terminal of the second-stage switched capacitor conversion chip and power management chip, and the output of the second-stage switched capacitor conversion chip and power management chip.
  • the terminals are all coupled to the battery;
  • the first-stage switched capacitor conversion chip is used to output the third DC power based on the first DC power, the voltage of the third DC power is lower than the voltage of the first DC power, and the third DC power Current is higher than the current of the first DC power supply;
  • the second-stage switched capacitor conversion chip is used to output the second DC power based on the third DC power, and charge the battery with the first current based on the second DC power, and the second
  • the voltage of the DC power source is lower than the voltage of the third DC power source, and the current of the second DC power source is higher than the current of the third DC power source;
  • the management chip is configured to charge the battery with the second current based on the second DC power source, and the second current is less than the first current.
  • the switched-capacitor conversion chip is further configured to detect a path current and control the switched-capacitor conversion chip to enter a current-limiting mode when the path current is greater than or equal to a sum of a current threshold and a first current offset.
  • the first current offset is greater than or greater than 0 and less than the current threshold.
  • the switched-capacitor conversion chip is used to enter a current-limiting mode, and specifically includes at least one of the following: increasing the on-resistance of the internal switching tube of the switched-capacitor conversion chip; or, turning off The internal switching tube in the switched capacitor conversion chip that charges the charging capacitor; or, the charging capacitor is connected in parallel to the output of the switched capacitor conversion chip to discharge; or, the charging time of the charging capacitor in the switched capacitor conversion chip is reduced.
  • the switched capacitor conversion chip is further configured to control the switched capacitor conversion chip to exit the current limiting mode when the path current is less than the difference between the current threshold and the second current offset, and the second current offset Greater than or greater than 0 and less than the current threshold.
  • the path current includes any one of the following: the input current of the switched capacitor conversion chip, the output current of the switched capacitor conversion chip, and the current on the internal switch tube in the switched capacitor conversion chip.
  • the switched capacitor conversion chip is further configured to adjust the current threshold according to a first control instruction of the terminal processor.
  • the switched capacitor conversion chip is further configured to be in a through state according to a second control instruction of the terminal processor.
  • a terminal including: the wireless charging receiving device according to any one of the first aspects.
  • the terminal further includes: a processor; a switched-capacitor conversion chip, further configured to detect a path current, and control the switch when the path current is greater than or equal to a sum of a current threshold and a first current offset.
  • the capacitor conversion chip enters the current limiting mode, and the first current offset is greater than or equal to 0 and less than the current threshold;
  • the processor is configured to output a first control instruction for adjusting the current threshold according to the current desired path current;
  • the switched capacitor The conversion chip is further configured to adjust the current threshold according to the first control instruction.
  • the processor is further configured to: according to the on-resistance of the internal switching tube of the switched-capacitor conversion chip, the on-state of the internal switching tube of the capacitor-conversion chip, or the charging of the charging capacitor in the switched-capacitor conversion chip The time is controlled to reduce the output voltage of the receiving chip of the wireless charging receiving device.
  • the processor is further configured to output a second control instruction for controlling the switched-capacitor conversion chip to be in a through state when entering a constant voltage charging stage; the switched-capacitor conversion chip is further configured to The two control instructions are in a through state.
  • a charging system including: a wireless charging transmitting device, a battery, and the wireless charging receiving device according to any one of the above-mentioned first aspects.
  • the charging system further includes: a processor; a switched-capacitor conversion chip, further configured to detect a path current, and control when the path current is greater than or equal to a sum of a current threshold and a first current offset
  • the switched-capacitor conversion chip enters a current-limiting mode, and the first current offset is greater than or equal to 0 and less than the current threshold
  • the processor is configured to output a first control instruction for adjusting the current threshold according to the current desired path current
  • the switch The capacitance conversion chip is further configured to adjust a current threshold according to a first control instruction.
  • the processor is further configured to: according to the on-resistance of the internal switch of the switched-capacitor conversion chip, the on-state of the internal switch of the capacitor-converted chip, or the charging of the charging capacitor in the switched-capacitor conversion chip The time is controlled to reduce the output voltage of the receiving chip of the wireless charging receiving device.
  • the processor is further configured to output a second control instruction for controlling the switched-capacitor conversion chip to be in a through state when entering a constant voltage charging stage; the switched-capacitor conversion chip is further configured to The two control instructions are in a through state.
  • the wireless charging transmitting device includes: a charger, a transmitting chip, and a transmitting coil; an input terminal of the transmitting chip is coupled to the charger, an output terminal of the transmitting chip is coupled to the transmitting coil; It communicates with the charger based on the control protocol, controls the voltage of the DC power output by the charger, and converts the DC power into AC power; the transmitting coil is used to convert the AC power into a magnetic field.
  • the wireless charging receiving device, charging system and terminal obtained by the present disclosure obtain an alternating current power source through a receiving coil coupled to an alternating magnetic field of a transmitting coil of the wireless charging transmitting device, and the receiving chip converts the alternating current power source into a first direct current power source, and switches the capacitor.
  • the conversion chip outputs a second DC power source based on the first DC power source, and charges the battery based on the second DC power source.
  • the voltage of the second DC power source is lower than the voltage of the first DC power source, and the current of the second DC power source is higher than that of the first DC power source.
  • the current of a DC power supply realizes the use of a switched capacitor conversion chip with extremely high conversion efficiency, thereby improving the charging power and charging efficiency.
  • the higher the output voltage of the wireless charging transmitting device the more significantly the charging efficiency is improved.
  • Fig. 1 is a block diagram of a wireless charging receiving device according to an exemplary embodiment.
  • Fig. 2A and Fig. 2B are schematic diagrams illustrating a conversion process of a switched capacitor conversion chip according to an exemplary embodiment.
  • Fig. 3 is a block diagram of a wireless charging receiving device according to another exemplary embodiment.
  • Fig. 4 is a block diagram of a wireless charging receiving device according to another exemplary embodiment.
  • Fig. 5A and Fig. 5B are waveform diagrams according to an exemplary embodiment.
  • Fig. 6 and Fig. 7 are schematic diagrams of a wireless charging receiving device according to an exemplary embodiment.
  • Fig. 8 is a block diagram showing a terminal 800 according to an exemplary embodiment.
  • Fig. 9 is a schematic diagram illustrating battery charging according to an exemplary embodiment.
  • Fig. 10 is a schematic diagram showing a charging system according to an exemplary embodiment.
  • Fig. 1 is a block diagram of a wireless charging receiving device according to an exemplary embodiment.
  • the wireless charging receiving device 10 in this embodiment may include a receiving coil 11, a receiving chip 12, and a switched capacitor conversion chip 13; the receiving coil 11 is used to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitting device, AC power is obtained; the input terminal of the receiving chip 12 is coupled to the receiving coil 11, and the output terminal of the receiving chip 12 is coupled to the input terminal of the switched capacitor conversion chip 13 for converting the AC power to the first DC power source; the switched capacitor The output of the conversion chip 13 is coupled to the battery for outputting the second DC power based on the first DC power and charging the battery based on the second DC power.
  • the voltage of the second DC power is lower than the voltage of the first DC power.
  • the current of the second DC power source is higher than that of the first DC power source.
  • the receiving coil 11 is coupled to the alternating magnetic field of the transmitting coil of the wireless charging transmitting device to obtain an AC power source
  • the receiving chip 12 converts the AC power source into a first DC power source
  • the switched capacitor conversion chip 13 outputs based on the first DC power source
  • the second DC power source charges the battery based on the second DC power source.
  • the voltage of the second DC power source is lower than the voltage of the first DC power source, and the current of the second DC power source is higher than the current of the first DC power source.
  • the coupling may specifically include a direct connection and an indirect connection.
  • the coil 11 may be any type of coil that can be coupled to an alternating magnetic field to obtain an AC power source.
  • the receiving chip 12 may specifically be any chip capable of obtaining a DC power source by rectifying the AC power source.
  • the switched capacitor conversion chip 13 outputs a second DC power source based on the first DC power source, that is, the switched capacitor conversion chip reduces the voltage of the first DC power source output from the receiving chip and increases the current of the first DC power source. It can be considered that the switched capacitor conversion chip is in a working state.
  • the switched capacitor conversion chip can be configured with an external pin of the switched capacitor conversion chip in a through state or an open circuit state. Further, it can be configured with other chips, such as a power management integrated circuit (PMIC), a processor, or a microcontroller.
  • PMIC power management integrated circuit
  • the control capacitor conversion chip is in a working state.
  • the specific manner in which other chips control the switched-capacitor conversion chip to work is not limited in this disclosure. For example, other chips may send an instruction to the switched-capacitor conversion chip to control the switched-capacity conversion chip to work through the I 2 C protocol.
  • the switched-capacitor conversion chip 13 is a chip that controls the charging and discharging of the capacitor through a switch to achieve voltage reduction and current increase.
  • the switched capacitor conversion chip may be a 1 / n switched capacitor conversion chip, and n may be 1.5, 2, or 3, and so on.
  • the switching process of the switched capacitor conversion chip 13 can be divided into a first phase ⁇ 1 and a second phase ⁇ 2, two phases.
  • first phase ⁇ 1 as shown in FIG. 2A, the internal switching tubes S1, S3, S5, and S7 are turned on, the capacitor CF1 is charged, and the capacitor CF2 is discharged, and the current flow can be shown as an arrow in FIG. 2A.
  • second phase ⁇ 2 as shown in FIG. 2B, the internal switching tubes S2, S4, S6, and S8 are turned on, the capacitor CF1 is discharged, the capacitor CF2 is charged, and the current flow can be shown as an arrow in FIG. 2B.
  • the conversion efficiency of the switched-capacitor conversion chip 13 is extremely high, which can reach 98%, while the conversion efficiency of the BUCK circuit is low, and the greater the difference between the input voltage and the output voltage of the BUCK circuit, the more severe the heating and the conversion efficiency The lower. Therefore, reducing the voltage and increasing the current through the switched-capacitor conversion chip can improve the charging efficiency compared with the step-down using the BUCK circuit.
  • the output voltage of the wireless charging transmitting device differs greatly from the input voltage of the battery, and the efficiency of the BUCK circuit is lower. Therefore, under high-power charging, the role of the switched-capacitor conversion chip to improve the charging efficiency is more obvious.
  • the wireless charging receiving device obtained in this embodiment obtains an AC power source through a receiving coil coupled to an alternating magnetic field of a transmitting coil of the wireless charging transmitting device, and the receiving chip converts the AC power source into a first DC power source.
  • the switched capacitor conversion chip is based on the first A DC power source outputs a second DC power source and charges the battery based on the second DC power source.
  • the voltage of the second DC power source is lower than the voltage of the first DC power source, and the current of the second DC power source is higher than the first DC power source.
  • Current the use of a switched capacitor conversion chip with extremely high conversion efficiency is achieved, thereby improving the charging power and charging efficiency.
  • the higher the output voltage of the wireless charging transmitting device the more significantly the charging efficiency is improved.
  • Fig. 3 is a block diagram of a wireless charging receiving device according to another exemplary embodiment.
  • the switched capacitor conversion chip 13 includes a first-stage switched-capacitor conversion chip 131 and a second-stage switched-capacitor conversion chip 132; the wireless charging receiving device further includes: power management Chip PMIC14, such as BUCK circuit.
  • the input terminal of the first-stage switched capacitor conversion chip 131 is coupled to the receiving chip 12, and the output terminal of the first-stage switched capacitor conversion chip 131 is coupled to the input terminals of the second-stage switched capacitor conversion chip 132 and PMIC14, respectively.
  • the output terminals of the secondary switched capacitor conversion chip 132 and the PMIC 14 are both coupled to the battery.
  • the first-stage switched capacitor conversion chip 131 is configured to output a second DC power source based on the third DC power source and charge the battery with the first current based on the second DC power source.
  • the voltage of the second DC power source is lower than that of the third DC power source.
  • Voltage, and the current of the second DC power source is higher than the current of the third DC power source (ie, reducing the voltage of the first DC power source output by the receiving chip 12 and increasing the current of the first DC power source);
  • the second-stage switch The capacitor conversion chip 132 is configured to output a second DC power source based on the third DC power source and charge the battery with the first current based on the second DC power source.
  • the voltage of the second DC power source is lower than the voltage of the third DC power source.
  • the current of the two DC power sources is higher than the current of the third DC power source (that is, after reducing the voltage of the third DC power source output by the first-stage switched capacitor conversion chip 131 and increasing the current of the third DC power source, the battery is charged. ); PMIC14, for charging the battery with a second current based on a second DC power source, and the second current is less than the first current.
  • charging the battery with the first current can be understood as constant current charging
  • charging the battery with the second current can be understood as constant voltage charging.
  • the PMIC 14 when high-power charging is required, the PMIC 14 does not work, the second-stage switched-capacitor conversion chip 132 works, and high-power charging is achieved through the second-stage switched-capacitor conversion chip 132.
  • PMIC14 works, and the second-stage switched capacitor conversion chip 132 does not work, and low-power charging is achieved through PMIC14.
  • the PMIC and the second-stage switched capacitor conversion chip 132 may be controlled to work or not work by the processor of the terminal.
  • the first-stage switched-capacitor conversion chip + the second-stage switched-capacitor conversion chip can be used to implement the constant-current charging stage; the first-stage switched-capacitor conversion chip + PMIC can be used to implement the constant-voltage charging stage.
  • the PMIC can be used as a charging chip. It should be noted that, when charging with low power, such as less than 5W, the switched capacitor conversion chip may be in a through state, for example, the first-stage switched capacitor conversion chip is in a through state, and the second-stage switched capacitor conversion chip is in an open state.
  • the wireless charging receiving device can also provide power to the software and hardware systems of the terminal.
  • the load dl of the software and hardware system usually fluctuates, which may cause a sudden change in I OUT ⁇ I, thereby causing a change in I REC (for example, when a two-stage switched capacitor conversion chip is included and When the stage switched capacitor conversion chip is a 1/2 switched capacitor conversion chip, the change amount of I REC is 1 / 4 ⁇ I).
  • the change of I REC is large, it will cause problems that affect the communication of the wireless charging system, for example, it can cause Communication to the wireless charging system was lost.
  • 51 indicates a waveform of I OUT
  • 52 indicates a waveform of V REC caused by I OUT fluctuation.
  • the transmitting chip in the wireless charging transmitting device needs to communicate with the receiving chip in the wireless charging receiving device in real time, and a large amplitude ripple is superimposed on V REC .
  • V REC causes the current I OUT to fluctuate frequently with communication, which easily causes the problem of overcharge. For example, suppose that the V REC overshoot reaches nearly 400mV, and the ripple on the output V OUT will be 100mV through a 2-stage 1/2 switched capacitor conversion chip. If the battery internal resistance is 100m ohm, the instantaneous fluctuation of I OUT is 1 Ampere (A).
  • the switched capacitor conversion chip 13 is further configured to detect a path current, and when the path current is greater than or equal to a sum of a current threshold and a first current offset, the switched capacitor conversion chip 13 is controlled to enter a current limiting mode, and the first current offset The amount is greater than or equal to 0 and less than the current threshold.
  • the current limiting mode refers to limiting the current of the switched-capacitor conversion chip.
  • the switched capacitor can limit the input current, output current, and / or current of the internal switch tube of the switched-capacitor conversion chip.
  • the switched capacitor enters the current-limiting mode, which can reduce the path current, thereby avoiding the aforementioned problems that appear as a sudden change in the path current.
  • the path current when the path current is greater than or equal to the sum of the current threshold and the first current offset, it can indicate that the path current is abnormal, which may affect the wireless charging system communication or cause overcharge; when the path current is less than the current threshold and the second When the current offset is different, it can indicate that the path current is normal, and it will not affect the communication of the wireless charging system or cause overcharging.
  • the path current may include any one of the following: an input current of the switched capacitor conversion chip 13, an output current of the switched capacitor conversion chip 13, and a current on an internal switch tube in the switched capacitor conversion chip 13.
  • any one of the first-stage switched-capacitor conversion chip and the second-stage switched-capacitor conversion chip may be used to switch capacitors.
  • the conversion chip detects a path current and controls itself to enter a current limiting mode when the path current is greater than or equal to a sum of a current threshold and a first current offset.
  • the path current input may include any one of the following: the input current (I REC ) of the first-stage switched capacitor conversion chip 131, the first The output current (I BUS ) of the first-stage switched-capacitor conversion chip 131, the main current I OUT output by the second-stage switched-capacitor conversion chip 132 in parallel with the PMIC, and the current on the internal switch tube in the first-stage switched-capacitor conversion chip 131.
  • the path current input may include any one of the following: the input current of the first-stage switched capacitor conversion chip 131, and the output current of the first-stage switched capacitor conversion chip 131
  • the second-stage switched-capacitor conversion chip 132 outputs the mains current I OUT in parallel with the PMIC, and the current on the internal switch tube in the second-stage switched-capacitor conversion chip 132.
  • the switched capacitor conversion chip 131 is further configured to control the switched capacitor conversion chip to exit the current limiting mode when the path current is less than the difference between the current threshold and the second current offset, and the second current offset is greater than Or equal to 0 and less than the current threshold. It should be noted that exiting the current-limiting mode here is opposite to the above-mentioned entering the current-limiting mode.
  • the first current offset may be equal to the second current offset.
  • the switched-capacitor conversion chip 13 may enter the current-limiting mode by increasing the on-resistance of the internal switch tube of the switched-capacitor conversion chip.
  • the switched capacitor conversion chip in order to improve the charging efficiency, is in a working process, and the on-resistance of the internal switch is usually the minimum value.
  • the switched capacitor conversion The chip immediately increases the on-resistance of each internal switch to enter the current limiting mode, thereby reducing the path current.
  • the switched capacitor conversion chip when the path current is less than the difference between the current threshold value and the second current bias amount, the switched capacitor conversion chip immediately reduces the on-resistance of each internal switching tube to a minimum value to exit the current limiting mode, thereby increasing the path Current.
  • the current threshold of I REC can be set to 1.1A.
  • the switched capacitor chip When the software and hardware system load (or V REC ) fluctuates, causing I REC to be greater than or equal to 1.1A, the switched capacitor chip immediately responds within several switching cycles. Enter the current-limiting mode to reduce the on-resistance of each internal switch, and its response time is generally within tens of microseconds. When the fluctuation of the load (or V REC ) of the software and hardware system disappears, the switched capacitor conversion chip exits the current limiting mode, and the on-resistance of its internal switch is restored to the lowest value.
  • the internal switch tube may be a metal-oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET).
  • MOSFET Metal-oxide semiconductor field effect transistor
  • this disclosure may not limit the adjustment range of the on-resistance of the switch tube inside the switched capacitor conversion chip.
  • it may be a fixed amplitude, or the adjustment amplitude may be determined according to the difference between the path current and the current threshold.
  • the switched-capacitor conversion chip 13 may enter the current-limiting mode by disconnecting the internal switching tube in the switched-capacitor conversion chip that charges the charging capacitor, or by connecting the charging capacitor to the output of the switched-capacitor conversion chip in parallel.
  • the charging capacitor may specifically be CF1 and CF2 in FIGS. 2A and 2B.
  • disconnecting the internal switch tube that charges the charging capacitor in the switched capacitor conversion chip can specifically disconnect S1 and S3; the output of connecting the charging capacitor in parallel to the switched capacitor conversion chip can specifically disconnect S1 and S1.
  • S3 also turns on S6 and S8.
  • disconnecting the internal switch tube that charges the charging capacitor in the switched capacitor conversion chip can specifically disconnect S2 and S4; connecting the charging capacitor in parallel to the switched capacitor conversion chip can specifically disconnect S2 and S2.
  • S4 also turns on S5 and S7. Specifically, when the path current is greater than or equal to the sum of the current threshold and the first current offset, the switched capacitor conversion chip immediately disconnects the internal switch tube for charging the charging capacitor in the switched capacitor conversion chip, or connects the charging capacitor to the switch in parallel. The output of the capacitor conversion chip is discharged to enter the current limiting mode, thereby reducing the path current.
  • the switched capacitor conversion chip resumes the normal capacitor charging and discharging switching process (for example, the two phases ⁇ 1 and ⁇ 2 in Figure 2A and Figure 2B respectively correspond to The repeated switching process of the internal switch tube will continue to exit the current limiting mode, thereby increasing the path current.
  • the switched-capacitor switching chip can be switched off by performing a cycle skip control on the switched-capacitor conversion chip.
  • An internal switching tube in the conversion chip that charges the charging capacitor; or, the charging capacitor is connected in parallel to the output of the switching capacitor conversion chip to discharge.
  • I OUT exceeds the current threshold value shown by the dotted line
  • a corresponding clock control period that is, the clock period shown by the dotted line
  • the switch capacitor switching chip to charge the charging capacitor is turned off.
  • An internal switch; or, a charging capacitor is connected in parallel to the output of the switched capacitor conversion chip to discharge.
  • the switched capacitor conversion chip resumes the normal capacitor charging and discharging switching process in the corresponding clock control cycle.
  • the first current bias amount and the second current bias amount are both 0 as an example.
  • the switched capacitor conversion chip 13 may enter the current-limiting mode by reducing the charging time of the charging capacitor in the switched capacitor conversion chip.
  • the charging capacitors can be specifically CF1 and CF2 in FIG. 2A and FIG. 2B, and reducing the charging time of the charging capacitor in the switched capacitor conversion chip can specifically reduce the charging time of CF1 and CF2.
  • the switched-capacitor conversion chip immediately reduces the charging time of the charging capacitor in the switched-capacitor conversion chip to enter the current limiting mode, thereby reducing the path. Current.
  • the switched capacitor conversion chip restores the normal charging time of the charging capacitor to exit the current limiting mode, thereby increasing the path current.
  • the switching capacitor conversion chip can be reduced by reducing the duty cycle of the clock.
  • Charging time of the medium charging capacitor As shown in FIG. 7, when I OUT exceeds the current threshold shown by the dotted line, the clock duty cycle corresponding to the clock control cycle is reduced, that is, the charging time is reduced and the discharging time is increased. Further, when I OUT does not exceed the current threshold shown by the dotted line, the clock duty cycle corresponding to the clock control period is restored.
  • the first current bias amount and the second current bias amount are both 0 as an example.
  • the switched capacitor conversion chip 13 is further configured to adjust a current threshold according to a first control instruction of the terminal processor.
  • the desired path current may be different at different charging stages of the battery.
  • the current threshold may be adjusted accordingly. Specifically, when the desired path current is larger, the current threshold may be larger; when the desired path current is smaller, the current threshold may be smaller.
  • the switched capacitor conversion chip 13 may also be in a through state according to a second control instruction of the terminal processor. Specifically, when it is in a constant voltage charging state, it is not necessary to increase the current, so the switched capacitor conversion chip can be controlled to be in a through state.
  • the switched-capacitor conversion chip in the through state may specifically be that S1, S2, S5, and S6 are all turned on, and S3, S4, S7, and S8 are all turned off.
  • VOUT can be equal to VIN and IOUT can be equal to IIN.
  • the switched-capacitor conversion chip 13 includes a first-stage switched-capacitor conversion chip 131 and a second-stage switched-capacitor conversion chip 132
  • the first-stage switched-capacitor conversion chip 131 may be specifically controlled to be in a through state.
  • the above-mentioned detection of the output current of the charging path by the switched capacitor conversion chip and entering the current limiting mode according to the output current of the charging path can achieve a higher response speed.
  • the first-stage switched capacitor conversion chip outputs a third DC power source based on the first DC power source, the voltage of the third DC power source is lower than the voltage of the first DC power source, and the third DC power source The current is higher than the current of the first DC power supply.
  • the second-stage switched capacitor conversion chip outputs the second DC power based on the third DC power supply, and charges the battery with the first current based on the second DC power supply.
  • the voltage is lower than the voltage of the third DC power source, and the current of the second DC power source is higher than the current of the third DC power source.
  • the PMIC is based on the second DC power source to charge the battery with the second current, and the second current is less than the first current.
  • Fig. 8 is a block diagram showing a terminal 800 according to an exemplary embodiment.
  • the terminal 800 may be a mobile phone, a computer, a digital broadcasting device, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.
  • the terminal 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, And communication component 816.
  • the processing component 802 generally controls overall operations of the terminal 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations.
  • the processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the method described above.
  • the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components.
  • the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.
  • the memory 804 is configured to store various types of data to support operations at the terminal 800. Examples of these data include instructions for any application or method for operating on the terminal 800, contact data, phone book data, messages, pictures, videos, and the like.
  • the memory 804 may be implemented by any type of volatile or non-volatile storage devices, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), Programming read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read-only memory
  • EPROM Programming read-only memory
  • PROM programmable read-only memory
  • ROM read-only memory
  • magnetic memory flash memory
  • flash memory magnetic disk or optical disk.
  • the power supply component 806 provides power to various components of the terminal 800.
  • the power component 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the terminal 800.
  • the multimedia component 808 includes a screen that provides an output interface between the terminal 800 and a user.
  • the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user.
  • the touch panel includes one or more touch sensors to sense touch, swipe, and gestures on the touch panel. The touch sensor can not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.
  • the multimedia component 808 includes a front camera and / or a rear camera. When the terminal 800 is in an operation mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.
  • the audio component 810 is configured to output and / or input audio signals.
  • the audio component 810 includes a microphone (MIC).
  • the microphone When the terminal 800 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive an external audio signal.
  • the received audio signal may be further stored in the memory 804 or transmitted via the communication component 816.
  • the audio component 810 further includes a speaker for outputting audio signals.
  • the I / O interface 812 provides an interface between the processing component 802 and a peripheral interface module.
  • the peripheral interface module may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
  • the sensor component 814 includes one or more sensors for providing terminal 800 with various aspects of status assessment.
  • the sensor component 814 can detect the on / off state of the terminal 800, and the relative positioning of the components, such as the display and keypad of the terminal 800.
  • the sensor component 814 can also detect the terminal 800 or a component of the terminal 800's position change. The presence or absence of the user's contact with the terminal 800, the orientation or acceleration / deceleration of the terminal 800, and the temperature change of the terminal 800.
  • the sensor component 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact.
  • the sensor component 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor component 814 may further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • the communication component 816 is configured to facilitate wired or wireless communication between the terminal 800 and other devices.
  • the terminal 800 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof.
  • the communication component 816 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel.
  • the communication component 816 further includes a near field communication (NFC) module to facilitate short-range communication.
  • the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra wideband
  • Bluetooth Bluetooth
  • the terminal 800 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable Gate array (FPGA), controller, microcontroller, microprocessor or other electronic components.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGA field programmable Gate array
  • controller microcontroller, microprocessor or other electronic components.
  • a non-transitory computer-readable storage medium including instructions such as a memory 804 including instructions, is also provided.
  • the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
  • the terminal 800 may include a wireless charging receiving device.
  • the wireless charging receiving device includes a receiving coil, a receiving chip, and a switched capacitor conversion chip.
  • the receiving coil is used to couple the alternating magnetic field of the transmitting coil of the wireless charging transmitting device to obtain an AC power source.
  • the input terminal of the receiving chip is coupled with the receiving coil, the output terminal of the receiving chip is coupled with the input terminal of the switched capacitor conversion chip for converting the AC power to the first DC power source; the output terminal of the switched capacitor conversion chip is connected to the battery Coupling for outputting a second DC power source based on the first DC power source and charging the battery based on the second DC power source, the voltage of the second DC power source is lower than the voltage of the first DC power source, and the current of the second DC power source Higher current than the first DC power supply.
  • the switched-capacitor conversion chip includes a first-stage switched-capacitor conversion chip and a second-stage switched-capacitor conversion chip;
  • the wireless charging receiving device further includes: a power management chip PMIC; The input terminal is coupled to the receiving chip, the output terminal of the first-stage switched capacitor conversion chip is coupled to the input terminal of the second-stage switched capacitor conversion chip and power management chip, and the output of the second-stage switched capacitor conversion chip and power management chip.
  • the terminals are all coupled to the battery;
  • the first-stage switched capacitor conversion chip is used to output the third DC power based on the first DC power, the voltage of the third DC power is lower than the voltage of the first DC power, and the third DC power Current is higher than the current of the first DC power supply;
  • the second-stage switched capacitor conversion chip is used to output the second DC power based on the third DC power, and charge the battery with the first current based on the second DC power, and the second
  • the voltage of the DC power source is lower than the voltage of the third DC power source, and the current of the second DC power source is higher than the current of the third DC power source;
  • the management chip is configured to charge the battery with the second current based on the second DC power source, and the second current is less than the first current.
  • the switched-capacitor conversion chip is further configured to detect a path current and control the switched-capacitor conversion chip to enter a current-limiting mode when the path current is greater than or equal to a sum of a current threshold and a first current offset.
  • the first current offset is greater than or equal to 0 and less than the current threshold.
  • the switched-capacitor conversion chip is used to enter a current-limiting mode, and specifically includes at least one of the following: increasing the on-resistance of the internal switching tube of the switched-capacitor conversion chip; or, turning off The internal switching tube in the switched capacitor conversion chip that charges the charging capacitor; or, the charging capacitor is connected in parallel to the output of the switched capacitor conversion chip to discharge; or, the charging time of the charging capacitor in the switched capacitor conversion chip is reduced.
  • the switched-capacitor conversion chip is further configured to control the switched-capacitor conversion chip to exit the current-limiting mode when the path current is less than the difference between the current threshold and the second current offset, and the second current offset Greater than or greater than 0 and less than the current threshold.
  • the path current includes any one of the following: the input current of the switched capacitor conversion chip, the output current of the switched capacitor conversion chip, and the current on the internal switch tube in the switched capacitor conversion chip.
  • the switched capacitor conversion chip is further configured to adjust the current threshold according to a first control instruction of the terminal processor.
  • the processor can detect the path current (such as I REC , I BUS, or I OUT ) and voltage (V REC , V BUS, or V OUT ) in real time, and charge the wireless in real time.
  • path current such as I REC , I BUS, or I OUT
  • V REC , V BUS, or V OUT voltage
  • Each module in the transmitting device and the wireless charging receiving device for example, a switched capacitor conversion chip
  • the current power is the largest, the efficiency is the highest, and the charging is more stable.
  • the processor can control the charger to increase the output voltage to make charging. The current remains at its maximum.
  • the processor can control the charger to reduce the voltage output, or control the switch chip to work in a through state to improve the overall charging efficiency.
  • the processor is further configured to output a first control instruction for adjusting the current threshold according to the current desired path current; the switched capacitor conversion chip is further configured to adjust the current threshold according to the first control instruction.
  • the battery charging is generally divided into a constant voltage charging phase and a constant current charging phase, and the path current is different in different time periods.
  • the processor may be based on the current desired path current. Adjust the current threshold.
  • the processor is further configured to output a second control instruction for controlling the switched-capacitor conversion chip to be in a through state when entering a constant voltage charging stage; the switched-capacitor conversion chip is further configured to The two control instructions are in a through state.
  • the processor may send a trigger signal to the switched capacitor conversion chip to trigger the switched capacitor conversion chip in a through state, and the switched capacitor forwarding chip may be in a through state according to the trigger signal.
  • the processor when the switched-capacitor conversion chip enters a current-limiting mode by increasing the on-resistance of the internal switching tube of the switched-capacitor conversion chip, the processor is further used to The on-resistance of the internal switch tube is controlled to reduce the output voltage of the receiving chip. Specifically, the processor may determine whether the on-resistance of the internal switching tube of the switched capacitor conversion chip is too large according to the output voltage of the receiving chip and the on-resistance of the internal switching tube of the switched capacitor conversion chip.
  • the output voltage of the receiving chip can be controlled to be reduced, for example, the output voltage of the receiving chip can be reduced by 20 mv. Further, as the output voltage V REC of the receiving chip is reduced, I REC is also reduced. In order to achieve the same charging power, the switched capacitor conversion chip can reduce the on-resistance of its internal switching tube.
  • the processor when the switched capacitor conversion chip is switched off by disconnecting the internal switching tube that charges the charging capacitor in the switched capacitor conversion chip or by paralleling the charging capacitor to the output of the switched capacitor conversion chip to discharge,
  • the processor When entering the current limiting mode, the processor is further configured to control and reduce the output voltage of the receiving chip of the wireless charging receiving device according to the conduction state of the internal switching tube of the capacitor conversion chip. Specifically, the processor may determine whether the switched capacitor conversion chip should exit the current limiting mode according to the output voltage of the receiving chip and the conduction state of the internal switch tube of the capacitor conversion chip.
  • the output voltage of the receiving chip can be controlled to be reduced, for example, the output voltage of the receiving chip can be reduced by 20 mv. Further, since the output voltage V REC of the receiving chip is reduced, I REC is also reduced. In order to achieve the same charging power, the switched capacitor conversion chip can exit the current limiting mode.
  • the processor when the switched-capacitor conversion chip enters a current-limiting mode by reducing the charging time of the charging capacitor in the switched-capacitor conversion chip, the processor is further configured to charge the chip according to the switched-capacitor conversion chip.
  • the charging time of the capacitor is controlled to reduce the output voltage of the receiving chip of the wireless charging receiving device.
  • the processor may determine whether the switched-capacitor conversion chip should exit the current-limit mode according to the output voltage of the receiving chip and the charging time of the charging capacitor in the switched-capacitor conversion chip.
  • the output voltage of the receiving chip can be controlled to be reduced, for example, the output voltage of the receiving chip can be reduced by 20 mv. Further, since the output voltage V REC of the receiving chip is reduced, I REC is also reduced. In order to achieve the same charging power, the switched capacitor conversion chip can exit the current limiting mode.
  • the present disclosure also provides a charging system, including a wireless charging transmitting device, a battery, and a wireless charging receiving device.
  • the wireless charging receiving device includes a receiving coil, a receiving chip, and a switched capacitor conversion chip.
  • the receiving coil is used to couple a wireless charging transmitter.
  • the alternating magnetic field of the transmitting coil of the device obtains AC power; the input end of the receiving chip is coupled to the receiving coil, and the output end of the receiving chip is coupled to the input end of the switched capacitor conversion chip, which is used to convert the AC power to the first direct current.
  • the output terminal of the switched capacitor conversion chip is coupled to the battery for outputting the second DC power based on the first DC power and charging the battery based on the second DC power.
  • the voltage of the second DC power is lower than the first Voltage of the power source, and the current of the second DC power source is higher than the current of the first DC power source.
  • the switched-capacitor conversion chip includes a first-stage switched-capacitor conversion chip and a second-stage switched-capacitor conversion chip;
  • the wireless charging receiving device further includes: a power management chip PMIC; The input terminal is coupled to the receiving chip, the output terminal of the first-stage switched capacitor conversion chip is coupled to the input terminal of the second-stage switched capacitor conversion chip and power management chip, and the output of the second-stage switched capacitor conversion chip and power management chip.
  • the terminals are all coupled to the battery;
  • the first-stage switched capacitor conversion chip is used to output the third DC power based on the first DC power, the voltage of the third DC power is lower than the voltage of the first DC power, and the third DC power Current is higher than the current of the first DC power supply;
  • the second-stage switched capacitor conversion chip is used to output the second DC power based on the third DC power, and charge the battery with the first current based on the second DC power, and the second
  • the voltage of the DC power source is lower than the voltage of the third DC power source, and the current of the second DC power source is higher than the current of the third DC power source;
  • the management chip is configured to charge the battery with the second current based on the second DC power source, and the second current is less than the first current.
  • the switched-capacitor conversion chip is further configured to detect a path current and control the switched-capacitor conversion chip to enter a current-limiting mode when the path current is greater than or equal to a sum of a current threshold and a first current offset.
  • the first current offset is greater than or greater than 0 and less than the current threshold.
  • the switched-capacitor conversion chip is used to enter a current-limiting mode, and specifically includes at least one of the following: increasing the on-resistance of the internal switching tube of the switched-capacitor conversion chip; or, turning off The internal switching tube in the switched capacitor conversion chip that charges the charging capacitor; or, the charging capacitor is connected in parallel to the output of the switched capacitor conversion chip to discharge; or, the charging time of the charging capacitor in the switched capacitor conversion chip is reduced.
  • the switched capacitor conversion chip is further configured to control the switched capacitor conversion chip to exit the current limiting mode when the path current is less than the difference between the current threshold and the second current offset, and the second current offset Greater than or greater than 0 and less than the current threshold.
  • the path current includes any one of the following: the input current of the switched capacitor conversion chip, the output current of the switched capacitor conversion chip, and the current on the internal switch tube in the switched capacitor conversion chip.
  • the switched capacitor conversion chip is further configured to detect a path current, and enter a current limiting mode when the path current is greater than or equal to a sum of a current threshold and a first current offset, and the first current is biased.
  • the shift is greater than or greater than 0 and less than the current threshold.
  • the charging system further includes: a processor; the processor is configured to output a first control instruction for adjusting a current threshold according to a currently desired path current; the switched capacitor conversion chip is further configured to The first control instruction of the terminal processor adjusts the current threshold.
  • the processor is further configured to: according to the on-resistance of the internal switching tube of the switched-capacitor conversion chip, the on-state of the internal switching tube of the capacitor-conversion chip, or the charging of the charging capacitor in the switched-capacitor conversion chip The time is controlled to reduce the output voltage of the receiving chip of the wireless charging receiving device.
  • the processor is further configured to output a second control instruction for controlling the switched-capacitor conversion chip in a through state when entering a constant-voltage charging stage; the switched-capacitor conversion chip is further configured to The second control instruction of the processor is in a through state.
  • the wireless charging transmitting device in the charging system includes: a charger 15, a transmitting chip 16, and a transmitting coil 17; The input end is coupled to the charger 15 and the output end of the transmitting chip 16 is coupled to the transmitting coil 17; the transmitting chip 16 is used to communicate with the charger 15 based on a control protocol, to control the voltage of the DC power source output by the charger 15, and The DC power is converted into an AC power; the transmitting coil 17 is used to convert the AC power into a magnetic field.
  • the charger 71 is directly coupled to the transmitting chip 72, and the BUCK circuit is omitted in the wireless charging transmitting device, which can avoid the power consumption caused by the BUCK circuit, thereby further improving the charging efficiency.
  • control protocol may be Power Delivery (PD), Qualcomm (Quick Charge) (QC) 4.0, and Super Charge Protocol (SCP) protocols.
  • the transmitting chip 16 directly communicates with the charger 15 through protocols such as PD, QC4.0, SCP, etc.
  • the output voltage adjustment accuracy can reach 20mV, and the output voltage can be more than 3V-20V, which can precisely adjust the power required by the back end.
  • the output voltage of the transmitting chip is higher than the BUCK circuit, the current on the coil can be reduced, thereby reducing the heating of the coil.
  • the capacitor connected in series with the transmitting coil and the capacitor connected in series with the receiving coil may both be resonance capacitors for improving the charging power.
  • the transmitting chip directly communicates with the charger through PD / QC4.0 / SCP and other protocols, and adjusts the output voltage V DC of the charger to about 20 volts (V);
  • the transmitting chip converts the DC voltage output by the charger into an AC voltage and supplies it to the transmitting coil
  • the receiving coil outputs the AC voltage to the receiving chip by coupling the energy of the transmitting coil, and the current on the receiving coil is about 1A (A);
  • the receiving chip rectifies the AC voltage to output a DC voltage V REC of about 19V and a path current I REC of about 1.1A, that is, an output power of 20W;
  • V REC is reduced by half by the first stage 1/2 switched capacitor conversion chip to output V BUS of about 9V and the path current I BUS of about 2.2A;
  • V BUS is stepped down by the second stage 1/2 switched capacitor conversion chip to output V OUT of about 4V and the path current I OUT of about 4.4A;
  • V BUS can be used as auxiliary charging via PMIC, to achieve input and output current limiting, trickle, low power charging and other functions.

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Abstract

本公开是关于一种无线充电接收装置、充电系统及终端。该无线充电接收装置，包括：接收线圈、接收芯片和开关电容转换芯片；接收线圈，用于耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源；接收芯片的输入端与接收线圈耦接，接收芯片的输出端与开关电容转换芯片的输入端耦接，用于将交流电源转换为第一直流电源；开关电容转换芯片的输出端与电池耦接，用于基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流。本公开提高了充电功率和充电效率。

Description

无线充电接收装置、充电系统及终端 技术领域
本公开涉及终端领域，尤其涉及一种无线充电接收装置、充电系统及终端。
背景技术
随着终端的广泛使用，无线充电技术成为终端进行充电的一种重要形式。
相关技术中，终端内部设置有无线充电接收装置，无线充电接收装置和无线充电发射装置内部均设置有线圈。无线充电发射装置中的电流流过充电线圈时会产生电磁场，无线充电接收装置的线圈靠近电磁场时，会在无线充电接收装置内部产生电流，从而利用电流和电磁场之间的转换对终端进行充电。终端的电池的输入电压较小，例如4V，为了提高充电功率和效率，无线充电发射装置的输出电压通常较高，并通过无线充电接收装置和无线充电发射装置内部设置的降压式变换电路(BUCK电路)完成电压转换。
发明内容
为克服相关技术中存在的问题，本公开提供一种无线充电接收装置、充电系统及终端。
根据本公开实施例的第一方面，提供一种无线充电接收装置，包括：接收线圈、接收芯片和开关电容转换芯片；接收线圈，用于耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源；接收芯片的输入端与接收线圈耦接，接收芯片的输出端与开关电容转换芯片的输入端耦接，用于将交流电源转换为第一直流电源；开关电容转换芯片的输出端与电池耦接，用于基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流。
在一种可能实现的设计中，开关电容转换芯片包括第一级开关电容转换芯片和第二级开关电容转换芯片；无线充电接收装置还包括：电源管理芯片PMIC；第一级开关电容转换芯片的输入端与接收芯片耦接，第一级开关电容转换芯片的输出端分别与第二级开关电容转换芯片和电源管理芯片的输入端耦接，第二级开关电容转换芯片和电源管理芯片的输出端均与电池耦接；第一级开关电容转换芯片，用于基于第一直流电源输出第三直流电源，第三直流电源的电压低于第一直流电源的电压，且第三直流电源的电流高于第一直流电源的电流；第二级开关电容转换芯片，用于基于第三直流电源输出第二直流电源，并基于第二直流电源以第一电流为电池进行充电，第二直流电源的电压低于第三直流电源的电压，且第二直流电源的电流高于第三直流电源的电流；电源管理芯片，用于基于第二直流电源以第二电流为电池进行充电，且第二电流小于第一电流。
在一种可能实现的设计中，开关电容转换芯片，还用于检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，控制开关电容转换芯片进入限流模式，第一电流偏移量大于或大于0，且小于电流阈值。
在一种可能实现的设计中，开关电容转换芯片，用于进入限流模式，具体包括下述中的至少一种：增大开关电容转换芯片的内部开关管的导通电阻；或者，断开开关电容转换芯片中给充电电容充电的内部开关管；或者，将充电电容并联到开关电容转换芯片的输出上进行放电；或者，减小开关电容转换芯片中充电电容的充电时间。
在一种可能实现的设计中，开关电容转换芯片，还用于在通路电流小于电流阈值与第二电流偏移量之差时，控制开关电容转换芯片退出限流模式，第二电流偏移量大于或大于0，且小于电流阈值。
在一种可能实现的设计中，通路电流包括下述中的任意一种：开关电容转换芯片的输入电流，开关电容转换芯片的输出电流，开关电容转换芯片中内部开关管上的电流。
在一种可能实现的设计中，开关电容转换芯片，还用于根据终端处理器的第一控制指令调节电流阈值。
在一种可能实现的设计中，开关电容转换芯片，还用于根据终端处理器的第二控制指令处于直通状态。
根据本公开实施例的第二方面，提供一种终端，其特征在于，包括：上述第一方面任一项的无线充电接收装置。
在一种可能实现的设计中，终端还包括：处理器；开关电容转换芯片，还用于检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，控制开关电容转换芯片进入限流模式，第一电流偏移量大于或等于0，且小于电流阈值；处理器，用于根据当前期望的通路电流，输出用于调节电流阈值的第一控制指令；开关电容转换芯片，还用于根据第一控制指令调节电流阈值。
在一种可能实现的设计中，处理器，还用于根据开关电容转换芯片的内部开关管的导通电阻、电容转换芯片的内部开关管的导通状态或者开关电容转换芯片中充电电容的充电时间，控制降低无线充电接收装置的接收芯片的输出电压。
在一种可能实现的设计中，处理器，还用于在进入恒压充电阶段时，输出用于控制开关电容转换芯片处于直通状态的第二控制指令；开关电容转换芯片，还用于根据第二控制指令处于直通状态。
根据本公开实施例的第三方面，提供一种充电系统，包括：无线充电发射装置、电池以及上述第一方面任一项的无线充电接收装置。
在一种可能实现的设计中，充电系统还包括：处理器；开关电容转换芯片，还用于检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，控制开关电容转换芯片进入限流模式，第一电流偏移量大于或等于0，且小于电流阈值；处理器，用于根据当 前期望的通路电流，输出用于调节电流阈值的第一控制指令；开关电容转换芯片，还用于根据第一控制指令调节电流阈值。
在一种可能实现的设计中，处理器，还用于根据开关电容转换芯片的内部开关管的导通电阻、电容转换芯片的内部开关管的导通状态或者开关电容转换芯片中充电电容的充电时间，控制降低无线充电接收装置的接收芯片的输出电压。
在一种可能实现的设计中，处理器，还用于在进入恒压充电阶段时，输出用于控制开关电容转换芯片处于直通状态的第二控制指令；开关电容转换芯片，还用于根据第二控制指令处于直通状态。
在一种可能实现的设计中，无线充电发射装置包括：充电器、发射芯片和发射线圈；发射芯片的输入端与充电器耦接，发射芯片的输出端与发射线圈耦接；发射芯片，用于基于控制协议与充电器通信，控制充电器输出的直流电源的电压，并将直流电源转换为交流电源；发射线圈，用于将交流电源转换成交变磁场。
本公开提供的无线充电接收装置、充电系统及终端，通过接收线圈耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源，接收芯片将该交流电源转换为第一直流电源，开关电容转换芯片基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流，实现了使用转换效率极高的开关电容转换芯片，从而提高了充电功率和充电效率。并且，无线充电发射装置的输出电压越高，充电效率提高的越明显。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。
图1是根据一示例性实施例示出的一种无线充电接收装置的框图。
图2A和图2B是根据一示例性实施例示出的一种开关电容转换芯片的转换过程示意图。
图3是根据另一示例性实施例示出的一种无线充电接收装置的框图。
图4是根据又一示例性实施例示出的一种无线充电接收装置的框图。
图5A和图5B是根据一示例性实施例示出的一种波形图。
图6和图7根据一示例性实施例示出的一种无线充电接收装置的示意图。
图8是根据一示例性实施例示出的终端800的框图。
图9是根据一示例性实施例示出的电池充电的示意图。
图10是根据一示例性实施例示出的充电系统的示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本发明相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本发明的一些方面相一致的装置和方法的例子。
图1是根据一示例性实施例示出的一种无线充电接收装置的框图。如图1所示，本实施例的无线充电接收装置10可以包括接收线圈11、接收芯片12和开关电容转换芯片13；接收线圈11，用于耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源；接收芯片12的输入端与接收线圈11耦接，接收芯片12的输出端与开关电容转换芯片13的输入端耦接，用于将交流电源转换为第一直流电源；开关电容转换芯片13的输出端与电池耦接，用于基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流。
具体的，接收线圈11耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源，接收芯片12将该交流电源转换为第一直流电源，开关电容转换芯片13基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流。
其中，耦接具体可以包括直接连接和间接连接。
其中，线圈11具体可以为可以耦合交变磁场，得到交流电源的任意类型线圈。
其中，接收芯片12具体可以能够通过对交流电源进行整流，得到直流电源的任意芯片。
其中，开关电容转换芯片13基于第一直流电源输出第二直流电源，即开关电容转换芯片降低接收芯片输出的第一直流电源的电压，并升高第一直流电源的电流，此时，可以认为开关电容转换芯片处于工作状态。通常，可以通过开关电容转换芯片的外部引脚配置开关电容转换芯片处于直通状态或开路状态，进一步的，可以通过其他芯片，例如电源管理芯片(Power Management Integrated Circuit，PMIC)、处理器或者单片机等控制电容转换芯片处于工作状态。对于其他芯片控制开关电容转换芯片处于工作状态的具体方式，本公开不作限定，例如，其他芯片可以通过I 2C协议，向开关电容转换芯片发送用于控制开关电容转换芯片处于工作状态的指令。
其中，开关电容转换芯片13是通过开关控制电容充放电，实现降电压及升电流的芯片。可选的，开关电容转换芯片可以为1/n开关电容转换芯片，n可以是1.5、2或3等。
其中，开关电容转换芯片13的转换过程可以分为第一阶段Φ1和第二阶段Φ2，两个阶段。对于第一阶段Φ1，如图2A所示，内部开关管S1、S3、S5和S7导通，电容CF1充电，电容CF2放电，电流流向可以如图2A中的箭头所示。对于第二阶段Φ2，如图2B所示，内部开关管S2、S4、S6和S8导通，电容CF1放电，电容CF2充电，电流流向可以如图2B中的箭头所示。如此反复开关，可以实现VOUT＝1/nVIN，IOUT＝n*IIN的输出。需要说明 的是，图2A和图2B中，C1P、C1N、GND、C2P、C2N、VOUT和VIN均为PIN脚，CB为电容。
需要说明的是，开关电容转换芯片13的转换效率极高，可以达到98％，而BUCK电路的转换效率较低，且BUCK电路在输入电压与输出电压相差越大时，发热越严重，转换效率越低。因此，通过开关电容转换芯片实现降电压升电流，与通过BUCK电路实现降压相比，可以提高充电效率。并且，为了实现大功率充电，无线充电发射装置的输出电压与电池的输入电压相差更大，BUCK电路的效率更低，因此在大功率充电下，开关电容转换芯片提高充电效率的作用更加明显。
本实施例提供的无线充电接收装置，通过接收线圈耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源，接收芯片将该交流电源转换为第一直流电源，开关电容转换芯片基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流，实现了使用转换效率极高的开关电容转换芯片，从而提高了充电功率及充电效率。并且，无线充电发射装置的输出电压越高，充电效率提高的越明显。
图3是根据另一示例性实施例示出的一种无线充电接收装置的框图。如图3所示，在图1所示实施例的基础上，开关电容转换芯片13包括第一级开关电容转换芯片131和第二级开关电容转换芯片132；无线充电接收装置还包括：电源管理芯片PMIC14，例如BUCK电路。其中，第一级开关电容转换芯片131的输入端与接收芯片12耦接，第一级开关电容转换芯片131的输出端分别与第二级开关电容转换芯片132和PMIC14的输入端耦接，第二级开关电容转换芯片132和PMIC14的输出端均与电池耦接。第一级开关电容转换芯片131，用于基于第三直流电源输出第二直流电源，并基于第二直流电源以第一电流为电池进行充电，第二直流电源的电压低于第三直流电源的电压，且第二直流电源的电流高于第三直流电源的电流(即，降低接收芯片12输出的第一直流电源的电压，并升高第一直流电源的电流)；第二级开关电容转换芯片132，用于基于第三直流电源输出第二直流电源，并基于第二直流电源以第一电流为电池进行充电，第二直流电源的电压低于第三直流电源的电压，且第二直流电源的电流高于第三直流电源的电流(即，在降低第一级开关电容转换芯片131输出的第三直流电源的电压，并升高第三直流电源的电流后，为电池进行充电)；PMIC14，用于基于第二直流电源以第二电流为电池进行充电，且第二电流小于第一电流。这里，以第一电流为电池充电可以理解为恒流充电，以第二电流为电池充电可以理解为恒压充电。
具体的，在需要进行大功率充电时，PMIC14不工作，第二级开关电容转换芯片132工作，通过第二级开关电容转换芯片132实现大功率充电。在需要进行小功率充电时，PMIC14工作，第二级开关电容转换芯片132不工作，通过PMIC14实现小功率充电。可选的，可以通过终端的处理器控制PMIC和第二级开关电容转换芯片132工作或者不工作。具体的，可以由第一级开关电容转换芯片+第二级开关电容转换芯片，实现恒流充电阶段；可以由第一 级开关电容转换芯片+PMIC，实现恒压充电阶段。这里，PMIC可以作为充电芯片。需要说明的是，当小功率充电时，如小于5W，开关电容转换芯片可以处于直通状态，例如第一级开关电容转换芯片处于直通状态，第二级开关电容转换芯片处于开路状态。
如图4所示，无线充电接收装置除了为电池充电，还可以为终端的软硬件系统提供电源。当终端通过无线充电接收装置对电池充电时，软硬件系统的负载dl通常会有波动，可能引起I OUT突然变化ΔI，从而引起I REC变化(例如，当包括两级开关电容转换芯片且每一级开关电容转换芯片为1/2开关电容转换芯片时，I REC的变化量有1/4ΔI)，当I REC变化较大时，就会导致影响到无线充电系统的通信的问题，例如可以引起无线充电系统的通信断开。例如，如图5A所示，51表示I OUT的波形，52表示I OUT波动造成V REC波动的波形。
另外，如图5B所示，在进行无线充电时，无线充电发射装置中的发射芯片需要与无线充电接收装置中的接收芯片实时通信，并且会在V REC上叠加幅值很大的纹波，造成电流I OUT随着通信频繁波动，容易造成过充的问题。例如，假设V REC上冲达到近400mV，经2级1/2开关电容转换芯片，表现在输出V OUT上的纹波就有100mV，如果电池内阻是100m欧，I OUT的瞬间波动就是1安培(A)。
可以看出，上述由于软硬件系统负载的波动以及V REC的波动所引起的问题均可以表现在通路电流的变化，因此，为了解决上述两个问题，提高充电过程的稳定性，可选的，开关电容转换芯片13，还用于检测通路电流，并在该通路电流大于或等于电流阈值与第一电流偏移量之和时，控制开关电容转换芯片13进入限流模式，第一电流偏移量大于或等于0且小于电流阈值。这里，限流模式是指限制开关电容转换芯片的电流，具体的，可以限制开关电容转换芯片的输入电流、输出电流和/或内部开关管的电流。开关电容进入限流模式，可以减小通路电流，从而避免表现为通路电流发生突变的上述问题。
具体的，当通路电流大于或等于电流阈值与第一电流偏移量之和时，可以表示通路电流异常，可能会影响无线充电系统的通信或造成过充；当通路电流小于电流阈值与第二电流偏移量之差时，可以表示通路电流正常，不会影响无线充电系统的通信或造成过充。
可选的，通路电流可以包括下述中的任意一种：开关电容转换芯片13的输入电流，开关电容转换芯片13的输出电流，开关电容转换芯片13中内部开关管上的电流。
可选的，当开关电容转换芯片包括第一级开关电容转换芯片和第二级开关电容转换芯片时，可以由第一级开关电容转换芯片和第二级开关电容转换芯片中的任意一个开关电容转换芯片检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，控制自身进入限流模式。
进一步可选的，当由第一级开关电容转换芯片检测通路电流时，通路电流输入可以包括下述中的任意一种：第一级开关电容转换芯片131的输入电流(I REC)，第一级开关电容转换芯片131的输出电流(I BUS)，第二级开关电容转换芯片132与PMIC并联输出的干路电流I OUT、第一级开关电容转换芯片131中内部开关管上的电流。当由第二级开关电容转换芯片检测通 路电流时，通路电流输入可以包括下述中的任意一种：第一级开关电容转换芯片131的输入电流，第一级开关电容转换芯片131的输出电流，第二级开关电容转换芯片132与PMIC并联输出的干路电流I OUT、第二级开关电容转换芯片132中内部开关管上的电流。
可选的，开关电容转换芯片131，还用于在该通路电流小于该电流阈值与第二电流偏移量之差时，控制该开关电容转换芯片退出限流模式，第二电流偏移量大于或等于0且小于电流阈值。需要说明的是，这里退出限流模式与上述进入限流模式相对。
可选的，第一电流偏移量可以等于第二电流偏移量。通过第一电流偏移量和第二电流偏移量，且第一电流偏移量和第二电流偏移量均大于0，可以避免在电流阈值处反复在进入限流模式和退出限流模式间切换。
可选的，开关电容转换芯片13可以通过增大开关电容转换芯片的内部开关管的导通电阻进入限流模式。可选的，为了提高充电效率，开关电容转换芯片在工作工程中，内部开关管的导通电阻通常为最小值，当通路电流大于或等于电流阈值与第一电流偏移量时，开关电容转换芯片立即增大各内部开关管的导通电阻，以进入限流模式，从而减小通路电流。进一步的，当通路电流小于电流阈值与第二电流偏置量之差时，开关电容转换芯片立即将各内部开关管的导通电阻减小至最小值，以退出限流模式，从而增大通路电流。例如，可以设定I REC的电流阈值为1.1A，当软硬件系统负载(或V REC)波动，导致I REC大于或等于1.1A时，开关电容芯片在几个开关周期内立即做出反馈，进入限流模式，降低各个内部开关管的导通电阻，其响应时间一般在几十微妙内。当软硬件系统负载(或V REC)波动消失时，开关电容转换芯片退出限流模式，其内部开关管的导通电阻恢复最低值。
可选的，内部开关管具体可以为金属-氧化物半导体场效应晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor，MOSFET)。
需要说明的是，对于开关电容转换芯片内部开关管的导通电阻的调节幅度，本公开可以不作限定。可选的，可以为固定幅度，或者也可以根据通路电流与电流阈值的差异程度，确定调节幅度。
可选的，开关电容转换芯片13可以通过断开开关电容转换芯片中给充电电容充电的内部开关管，或者将充电电容并联到开关电容转换芯片的输出上进行放电进入限流模式。这里，充电电容具体可以为图2A和图2B中的CF1和CF2。当处于第一阶段Φ1时，断开开关电容转换芯片中给充电电容充电的内部开关管具体可以为断开S1和S3；将充电电容并联到开关电容转换芯片的输出具体可以为断开S1和S3并导通S6和S8。当处于第二阶段Φ2时，断开开关电容转换芯片中给充电电容充电的内部开关管具体可以为断开S2和S4；将充电电容并联到开关电容转换芯片的输出具体可以为断开S2和S4并导通S5和S7。具体的，当通路电流大于或等于电流阈值与第一电流偏移量之和时，开关电容转换芯片立即断开开关电容转换芯片中给充电电容充电的内部开关管，或者将充电电容并联到开关电容转换芯片的输出上进行放电，以进入限流模式，从而减小通路电流。进一步的，当通路电流小于电流阈值与 第二电流偏置量之差时，开关电容转换芯片恢复正常的电容充放电开关过程(例如，图2A和图2B中Φ1和Φ2两个阶段分别对应的内部开关管的反复开关过程)又会继续，以退出限流模式，从而增大通路电流。
可选的，由于开关电容转换芯片的内部开关管，是由时钟按照一定的频率，一定的逻辑时序进行开、关的，因此通过对开关电容转换芯片进行跳周期控制，可以实现断开开关电容转换芯片中给充电电容充电的内部开关管；或者，将充电电容并联到开关电容转换芯片的输出上进行放电。具体的，如图6所示，当I OUT超过虚线所示的电流阈值时，在对应的时钟控制周期(即，虚线所示的时钟周期)，断开开关电容转换芯片中给充电电容充电的内部开关管；或者，将充电电容并联到开关电容转换芯片的输出上进行放电。进一步的，当I OUT未超过虚线所示的电流阈值时，在对应的时钟控制周期，开关电容转换芯片恢复正常的电容充放电开关过程。需要说明的是，图6中以第一电流偏置量和第二电流偏置量均为0为例。
可选的，开关电容转换芯片13可以通过减小开关电容转换芯片中充电电容的充电时间进入限流模式。这里，充电电容具体可以为图2A和图2B中的CF1和CF2，断减小开关电容转换芯片中充电电容的充电时间具体可以为减小CF1和CF2的充电时间。具体的，当通路电流大于或等于电流阈值与第一电流偏移量之和时，开关电容转换芯片立即减小开关电容转换芯片中充电电容的充电时间，以进入限流模式，从而减小通路电流。进一步的，当通路电流小于电流阈值与第二电流偏置量之差时，开关电容转换芯片恢复正常的充电电容的充电时间，以退出限流模式，从而增大通路电流。
可选的，由于开关电容转换芯片的内部开关管，是由时钟按照一定的频率，一定的逻辑时序进行开、关的，因此通过减小时钟的占空比，可以实现减小开关电容转换芯片中充电电容的充电时间。具体的，如图7所示，当I OUT超过虚线所示的电流阈值时，减小对应时钟控制周期的时钟占空比，即减小充电时间，增大放电时间。进一步的，当I OUT未超过虚线所示的电流阈值时，恢复对应时钟控制周期的时钟占空比。需要说明的是，图7中以第一电流偏置量和第二电流偏置量均为0为例。
可选的，开关电容转换芯片13，还用于根据终端处理器的第一控制指令调整电流阈值。具体的，在电池的不同充电阶段，期望的通路电流可以不同，为了实现更精确的控制，可以依此调整电流阈值。具体的，当期望的通路电流越大时，电流阈值可以越大；当期望的通路电流越小时，电流阈值可以越小。
可选的，开关电容转换芯片13，还可以根据终端处理器的第二控制指令处于直通状态。具体的，当处于恒压充电状态时，不需要增大电流，因此可以控制开关电容转换芯片处于直通状态。对于图2A和图2B所示的1/2开关电容转换芯片，开关电容转换芯片处于直通状态具体可以为S1、S2、S5和S6均导通，S3、S4、S7和S8均断开。当开关电容转换芯片处于直通状态时，VOUT可以等于VIN，IOUT可以等于IIN。需要说明的是，当开关电容转换芯片13包括第一级开关电容转换芯片131和第二级开关电容转换芯片132时，具体可以 控制第一级开关电容转换芯片131处于直通状态。
另外，上述通过开关电容转换芯片检测充电通路的输出电流，并根据充电通路的输出电流进入限流模式，可以实现较高的响应速度。
本实施例提供的无线充电接收装置，第一级开关电容转换芯片基于第一直流电源输出第三直流电源，第三直流电源的电压低于第一直流电源的电压，且第三直流电源的电流高于第一直流电源的电流，第二级开关电容转换芯片基于第三直流电源输出第二直流电源，并基于第二直流电源以第一电流为电池进行充电，第二直流电源的电压低于第三直流电源的电压，且第二直流电源的电流高于第三直流电源的电流，PMIC基于第二直流电源以第二电流为电池进行充电，且第二电流小于第一电流，在提高大功率充电的充电效率的基础上，进一步可以实现小功率充电。
图8是根据一示例性实施例示出的终端800的框图。例如，终端800可以是移动电话，计算机，数字广播设备，消息收发设备，游戏控制台，平板设备，医疗设备，健身设备，个人数字助理等。
参照图8，终端800可以包括以下一个或多个组件：处理组件802，存储器804，电源组件806，多媒体组件808，音频组件810，输入/输出(I/O)的接口812，传感器组件814，以及通信组件816。
处理组件802通常控制终端800的整体操作，诸如与显示，电话呼叫，数据通信，相机操作和记录操作相关联的操作。处理组件802可以包括一个或多个处理器820来执行指令，以完成上述的方法的全部或部分步骤。此外，处理组件802可以包括一个或多个模块，便于处理组件802和其他组件之间的交互。例如，处理组件802可以包括多媒体模块，以方便多媒体组件808和处理组件802之间的交互。
存储器804被配置为存储各种类型的数据以支持在终端800的操作。这些数据的示例包括用于在终端800上操作的任何应用程序或方法的指令，联系人数据，电话簿数据，消息，图片，视频等。存储器804可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
电源组件806为终端800的各种组件提供电力。电源组件806可以包括电源管理系统，一个或多个电源，及其他与为终端800生成、管理和分配电力相关联的组件。
多媒体组件808包括在该终端800和用户之间的提供一个输出接口的屏幕。在一些实施例中，屏幕可以包括液晶显示器(LCD)和触摸面板(TP)。如果屏幕包括触摸面板，屏幕可以被实现为触摸屏，以接收来自用户的输入信号。触摸面板包括一个或多个触摸传感器以感测触摸、滑动和触摸面板上的手势。该触摸传感器可以不仅感测触摸或滑动动作的边界，而且还检测与该触摸或滑动操作相关的持续时间和压力。在一些实施例中，多媒体组件808 包括一个前置摄像头和/或后置摄像头。当终端800处于操作模式，如拍摄模式或视频模式时，前置摄像头和/或后置摄像头可以接收外部的多媒体数据。每个前置摄像头和后置摄像头可以是一个固定的光学透镜系统或具有焦距和光学变焦能力。
音频组件810被配置为输出和/或输入音频信号。例如，音频组件810包括一个麦克风(MIC)，当终端800处于操作模式，如呼叫模式、记录模式和语音识别模式时，麦克风被配置为接收外部音频信号。所接收的音频信号可以被进一步存储在存储器804或经由通信组件816发送。在一些实施例中，音频组件810还包括一个扬声器，用于输出音频信号。
I/O接口812为处理组件802和外围接口模块之间提供接口，上述外围接口模块可以是键盘，点击轮，按钮等。这些按钮可包括但不限于：主页按钮、音量按钮、启动按钮和锁定按钮。
传感器组件814包括一个或多个传感器，用于为终端800提供各个方面的状态评估。例如，传感器组件814可以检测到终端800的打开/关闭状态，组件的相对定位，例如该组件为终端800的显示器和小键盘，传感器组件814还可以检测终端800或终端800一个组件的位置改变，用户与终端800接触的存在或不存在，终端800方位或加速/减速和终端800的温度变化。传感器组件814可以包括接近传感器，被配置用来在没有任何的物理接触时检测附近物体的存在。传感器组件814还可以包括光传感器，如CMOS或CCD图像传感器，用于在成像应用中使用。在一些实施例中，该传感器组件814还可以包括加速度传感器，陀螺仪传感器，磁传感器，压力传感器或温度传感器。
通信组件816被配置为便于终端800和其他设备之间有线或无线方式的通信。终端800可以接入基于通信标准的无线网络，如WiFi，2G或3G，或它们的组合。在一个示例性实施例中，通信组件816经由广播信道接收来自外部广播管理系统的广播信号或广播相关信息。在一个示例性实施例中，该通信组件816还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其他技术来实现。
在示例性实施例中，终端800可以被一个或多个应用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、控制器、微控制器、微处理器或其他电子元件实现。
在示例性实施例中，还提供了一种包括指令的非临时性计算机可读存储介质，例如包括指令的存储器804。例如，该非临时性计算机可读存储介质可以是ROM、随机存取存储器(RAM)、CD-ROM、磁带、软盘和光数据存储设备等。
其中，终端800可以包括无线充电接收装置，该无线充电接收装置包括：接收线圈、接收芯片和开关电容转换芯片；接收线圈，用于耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源；接收芯片的输入端与接收线圈耦接，接收芯片的输出端与开关电容转换芯片的输入端耦接，用于将交流电源转换为第一直流电源；开关电容转换芯片的输出端与电池耦 接，用于基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流。
在一种可能实现的设计中，开关电容转换芯片包括第一级开关电容转换芯片和第二级开关电容转换芯片；无线充电接收装置还包括：电源管理芯片PMIC；第一级开关电容转换芯片的输入端与接收芯片耦接，第一级开关电容转换芯片的输出端分别与第二级开关电容转换芯片和电源管理芯片的输入端耦接，第二级开关电容转换芯片和电源管理芯片的输出端均与电池耦接；第一级开关电容转换芯片，用于基于第一直流电源输出第三直流电源，第三直流电源的电压低于第一直流电源的电压，且第三直流电源的电流高于第一直流电源的电流；第二级开关电容转换芯片，用于基于第三直流电源输出第二直流电源，并基于第二直流电源以第一电流为电池进行充电，第二直流电源的电压低于第三直流电源的电压，且第二直流电源的电流高于第三直流电源的电流；电源管理芯片，用于基于第二直流电源以第二电流为电池进行充电，且第二电流小于第一电流。
在一种可能实现的设计中，开关电容转换芯片，还用于检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，控制开关电容转换芯片进入限流模式，第一电流偏移量大于或等于0，且小于电流阈值。
在一种可能实现的设计中，开关电容转换芯片，用于进入限流模式，具体包括下述中的至少一种：增大开关电容转换芯片的内部开关管的导通电阻；或者，断开开关电容转换芯片中给充电电容充电的内部开关管；或者，将充电电容并联到开关电容转换芯片的输出上进行放电；或者，减小开关电容转换芯片中充电电容的充电时间。
在一种可能实现的设计中，开关电容转换芯片，还用于在通路电流小于电流阈值与第二电流偏置量之差时，控制开关电容转换芯片退出限流模式，第二电流偏移量大于或大于0，且小于电流阈值。
在一种可能实现的设计中，通路电流包括下述中的任意一种：开关电容转换芯片的输入电流，开关电容转换芯片的输出电流，开关电容转换芯片中内部开关管上的电流。
在一种可能实现的设计中，开关电容转换芯片，还用于根据终端处理器的第一控制指令调节电流阈值。
可选的，为了提高充电效率，优化功率传输状态，处理器可以实时检测通路电流(例如I REC、I BUS或I OUT)及电压(V REC、V BUS或V OUT)，并实时对无线充电发射装置和无线充电接收装置中的各个模块(例如，开关电容转换芯片)进行控制，使得当前功率最大，效率最高，充电更稳定。
具体的，当电池处于恒流充电阶段时，电池电压会逐渐升高，这样进入电池的电流就会逐渐降低，此时处理器检测到通路电流降低后，可以控制充电器提高输出电压，使得充电电流保持最大状态。当电池进入恒压充电阶段时，电池电流逐渐减小，此时处理器可以控制充电器将电压输出降低，或控制开关芯片工作在直通状态提高了整体充电效率。
在一种可能实现的设计中，处理器，还用于根据当前期望的通路电流，输出用于调节电流阈值的第一控制指令；开关电容转换芯片，还用于根据第一控制指令调节电流阈值。
具体的，如图9所示，电池充电通常分为恒压充电阶段和恒流充电阶段，并且，在不同时间段通路电流不同，为了实现更精确的控制，处理器可以根据当前期望的通路电流调节电流阈值。
在一种可能实现的设计中，处理器，还用于在进入恒压充电阶段时，输出用于控制开关电容转换芯片处于直通状态的第二控制指令；开关电容转换芯片，还用于根据第二控制指令处于直通状态。具体的，处理器可以向开关电容转换芯片发送用于触发开关电容转换芯片处于直通状态的触发信号，开关电容转发芯片可以根据该触发信号处于直通状态。
在一种可能实现的设计中，当开关电容转换芯片，通过增大开关电容转换芯片的内部开关管的导通电阻的方式，进入限流模式时，处理器，还用于根据开关电容转换芯片的内部开关管的导通电阻，控制降低接收芯片的输出电压。具体的，处理器可以根据接收芯片的输出电压以及开关电容转换芯片的内部开关管的导通电阻，判断开关电容转换芯片的内部开关管的导通电阻是否过大。当开关电容转换芯片的内部开关管的导通电阻过大时，可以控制降低接收芯片的输出电压，例如将接收芯片的输出电压降低20mv。进一步的，由于降低接收芯片的输出电压V REC，因此I REC也降低，为了实现相同的充电功率，因此开关电容转换芯片可以降低其内部开关管的导通电阻。
在一种可能实现的设计中，当开关电容转换芯片，通过断开开关电容转换芯片中给充电电容充电的内部开关管或者，将充电电容并联到开关电容转换芯片的输出上进行放电的方式，进入限流模式时，处理器，还用于根据电容转换芯片的内部开关管的导通状态，控制降低无线充电接收装置的接收芯片的输出电压。具体的，处理器可以根据接收芯片的输出电压以及电容转换芯片的内部开关管的导通状态，判断开关电容转换芯片是否应该退出限流模式。当开关电容转换芯片应该退出限流模式时，可以控制降低接收芯片的输出电压，例如将接收芯片的输出电压降低20mv。进一步的，由于降低接收芯片的输出电压V REC，因此I REC也降低，为了实现相同的充电功率，因此开关电容转换芯片可以退出限流模式。
在一种可能实现的设计中，当开关电容转换芯片，通过减小开关电容转换芯片中充电电容的充电时间的方式，进入限流模式时，处理器，还用于根据开关电容转换芯片中充电电容的充电时间，控制降低无线充电接收装置的接收芯片的输出电压。具体的，处理器可以根据接收芯片的输出电压以及开关电容转换芯片中充电电容的充电时间，判断开关电容转换芯片是否应该退出限流模式。当开关电容转换芯片应该退出限流模式时，可以控制降低接收芯片的输出电压，例如将接收芯片的输出电压降低20mv。进一步的，由于降低接收芯片的输出电压V REC，因此I REC也降低，为了实现相同的充电功率，因此开关电容转换芯片可以退出限流模式。
本公开还提供一种充电系统，包括无线充电发射装置、电池以及无线充电接收装置；其 中，无线充电接收装置包括：接收线圈、接收芯片和开关电容转换芯片；接收线圈，用于耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源；接收芯片的输入端与接收线圈耦接，接收芯片的输出端与开关电容转换芯片的输入端耦接，用于将交流电源转换为第一直流电源；开关电容转换芯片的输出端与电池耦接，用于基于第一直流电源输出第二直流电源，并基于第二直流电源为电池充电，第二直流电源的电压低于第一直流电源的电压，且第二直流电源的电流高于第一直流电源的电流。
在一种可能实现的设计中，开关电容转换芯片包括第一级开关电容转换芯片和第二级开关电容转换芯片；无线充电接收装置还包括：电源管理芯片PMIC；第一级开关电容转换芯片的输入端与接收芯片耦接，第一级开关电容转换芯片的输出端分别与第二级开关电容转换芯片和电源管理芯片的输入端耦接，第二级开关电容转换芯片和电源管理芯片的输出端均与电池耦接；第一级开关电容转换芯片，用于基于第一直流电源输出第三直流电源，第三直流电源的电压低于第一直流电源的电压，且第三直流电源的电流高于第一直流电源的电流；第二级开关电容转换芯片，用于基于第三直流电源输出第二直流电源，并基于第二直流电源以第一电流为电池进行充电，第二直流电源的电压低于第三直流电源的电压，且第二直流电源的电流高于第三直流电源的电流；电源管理芯片，用于基于第二直流电源以第二电流为电池进行充电，且第二电流小于第一电流。
在一种可能实现的设计中，开关电容转换芯片，还用于检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，控制开关电容转换芯片进入限流模式，第一电流偏移量大于或大于0，且小于电流阈值。
在一种可能实现的设计中，开关电容转换芯片，用于进入限流模式，具体包括下述中的至少一种：增大开关电容转换芯片的内部开关管的导通电阻；或者，断开开关电容转换芯片中给充电电容充电的内部开关管；或者，将充电电容并联到开关电容转换芯片的输出上进行放电；或者，减小开关电容转换芯片中充电电容的充电时间。
在一种可能实现的设计中，开关电容转换芯片，还用于在通路电流小于电流阈值与第二电流偏移量之差时，控制开关电容转换芯片退出限流模式，第二电流偏移量大于或大于0，且小于电流阈值。
在一种可能实现的设计中，通路电流包括下述中的任意一种：开关电容转换芯片的输入电流，开关电容转换芯片的输出电流，开关电容转换芯片中内部开关管上的电流。
在一种可能实现的设计中，开关电容转换芯片，还用于检测通路电流，并在通路电流大于或等于电流阈值与第一电流偏移量之和时，进入限流模式，第一电流偏移量大于或大于0，且小于电流阈值。
在一种可能实现的设计中，充电系统还包括：处理器；处理器，用于根据当前期望的通路电流，输出用于调节电流阈值的第一控制指令；开关电容转换芯片，还用于根据终端处理器的第一控制指令调节电流阈值。
在一种可能实现的设计中，处理器，还用于根据开关电容转换芯片的内部开关管的导通电阻、电容转换芯片的内部开关管的导通状态或者开关电容转换芯片中充电电容的充电时间，控制降低无线充电接收装置的接收芯片的输出电压。
在一种可能实现的设计中，处理器，还用于在进入恒压充电阶段时，输出用于控制开关电容转换芯片处于直通状态的第二控制指令；开关电容转换芯片，还用于根据终端处理器的第二控制指令处于直通状态。
以无线充电接收装置如图4所示为例，如图10所示，可选的，该充电系统中的无线充电发射装置包括：充电器15、发射芯片16和发射线圈17；发射芯片16的输入端与充电器15耦接，发射芯片16的输出端与发射线圈17耦接；发射芯片16，用于基于控制协议与充电器15通信，控制充电器15输出的直流电源的电压，并将直流电源转换为交流电源；发射线圈17，用于将交流电源转换成交变磁场。这里，通过充电器71直接与发射芯片72耦接，在无线充电发射装置中省去了BUCK电路，可以避免由于BUCK电路带来的功耗，从而进一步提高充电效率。
可选的，控制协议可以为功率传输(Power Delivery，PD)、高通(Quick Charge，QC)4.0、超级充电协议(Super Charge Protocol，SCP)协议。发射芯片16通过PD、QC4.0、SCP等协议，直接与充电器15进行通信，输出电压调节精度可以达到20mV，输出电压3V～20V以上，可以精准调节后端所需的功率。另外，由于发射芯片的输出电压较BUCK电路高，可以减小线圈上的电流，从而减小线圈发热。
需要说明的是，图10中，与发射线圈串联的电容以及与接收线圈串联的电容，均可以为谐振电容，用于提高充电功率。
以充电功率为20瓦(W)，开关电容转换芯片为1/2开关电容转换芯片为例，工作过程如下：
(1)、发射芯片通过PD/QC4.0/SCP等协议直接与充电器进行通信，调节充电器的输出电压V DC大约20伏(V)；
(2)、发射芯片将充电器输出的直流电压变换成交流电压，供给发射线圈；
(3)、接收线圈通过耦合发射线圈的能量，将交流电压输出给接收芯片，接收线圈上的电流大约为1安(A)；
(4)、接收芯片将交流电压整流后输出直流电压V REC，大约19V，通路电流I REC约1.1A，即输出功率为20W；
(5)、V REC经第一级1/2开关电容转换芯片降压一半输出V BUS约9V，通路电流I BUS约为2.2A；
(6)、V BUS经第二级1/2开关电容转换芯片降压一半输出V OUT约4V，通路电流I OUT约为4.4A；
(7)、V BUS经PMIC可以作为辅助充电，实现输入输出限流，涓流、小功率充电等功能。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精神由权利要求书指出。
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求书来限制。

Claims (17)

  1. 一种无线充电接收装置，其特征在于，包括：接收线圈、接收芯片和开关电容转换芯片；所述接收线圈，用于耦合无线充电发射装置的发射线圈的交变磁场，得到交流电源；
    所述接收芯片的输入端与所述接收线圈耦接，所述接收芯片的输出端与所述开关电容转换芯片的输入端耦接，用于将所述交流电源转换为第一直流电源；
    所述开关电容转换芯片的输出端与电池耦接，用于基于所述第一直流电源输出第二直流电源，并基于所述第二直流电源为所述电池充电，所述第二直流电源的电压低于所述第一直流电源的电压，且所述第二直流电源的电流高于所述第一直流电源的电流。
  2. 根据权利要求1所述的无线充电接收装置，其特征在于，所述开关电容转换芯片包括第一级开关电容转换芯片和第二级开关电容转换芯片；所述无线充电接收装置还包括：电源管理芯片PMIC；
    所述第一级开关电容转换芯片的输入端与所述接收芯片耦接，所述第一级开关电容转换芯片的输出端分别与所述第二级开关电容转换芯片和所述电源管理芯片的输入端耦接，所述第二级开关电容转换芯片和所述电源管理芯片的输出端均与所述电池耦接；
    所述第一级开关电容转换芯片，用于基于所述第一直流电源输出第三直流电源，所述第三直流电源的电压低于所述第一直流电源的电压，且所述第三直流电源的电流高于所述第一直流电源的电流；
    所述第二级开关电容转换芯片，用于基于所述第三直流电源输出第二直流电源，并基于所述第二直流电源以第一电流为所述电池进行充电，所述第二直流电源的电压低于所述第三直流电源的电压，且所述第二直流电源的电流高于所述第三直流电源的电流；
    所述电源管理芯片，用于基于所述第二直流电源以第二电流为所述电池进行充电，且所述第二电流小于所述第一电流。
  3. 根据权利要求1或2所述的无线充电接收装置，其特征在于，所述开关电容转换芯片，还用于检测通路电流，并在所述通路电流大于或等于电流阈值与第一电流偏移量之和时，控制所述开关电容转换芯片进入限流模式，所述第一电流偏移量大于或大于0，且小于所述电流阈值。
  4. 根据权利要求3所述的无线充电接收装置，其特征在于，所述开关电容转换芯片，用于控制所述开关电容转换芯片进入限流模式，具体包括下述中的至少一种：
    增大开关电容转换芯片的内部开关管的导通电阻；或者，断开开关电容转换芯片中给充电电容充电的内部开关管；或者，将充电电容并联到开关电容转换芯片的输出上进行放电；或者，减小开关电容转换芯片中充电电容的充电时间。
  5. 根据权利要求3所述的无线充电接收装置，其特征在于，所述开关电容转换芯片，还用于在所述通路电流小于所述电流阈值与第二电流偏移量之差时，控制所述开关电容转换 芯片退出限流模式，所述第二电流偏移量大于或大于0，且小于所述电流阈值。
  6. 根据权利要求3所述的无线充电接收装置，其特征在于，所述通路电流包括下述中的任意一种：
    所述开关电容转换芯片的输入电流，所述开关电容转换芯片的输出电流，所述开关电容转换芯片中内部开关管上的电流。
  7. 根据权利要求3所述的无线充电接收装置，其特征在于，所述开关电容转换芯片，还用于根据终端处理器的第一控制指令调节所述电流阈值。
  8. 根据权利要求7所述的无线充电接收装置，其特征在于，所述开关电容转换芯片，还用于根据所述处理器的第二控制指令处于直通状态。
  9. 一种终端，其特征在于，包括：权利要求1-8中任一项所述的无线充电接收装置。
  10. 根据权利要求9所述的终端，其特征在于，所述终端还包括：处理器；
    所述开关电容转换芯片，还用于检测通路电流，并在所述通路电流大于或等于电流阈值与第一电流偏移量之和时，控制所述开关电容转换芯片进入限流模式，所述第一电流偏移量大于或等于0，且小于所述电流阈值；
    所述处理器，用于根据当前期望的通路电流，输出用于调节所述电流阈值的第一控制指令；
    所述开关电容转换芯片，还用于根据所述第一控制指令调节所述电流阈值。
  11. 根据权利要求10所述的终端，其特征在于，所述处理器，还用于根据所述开关电容转换芯片的内部开关管的导通电阻、所述电容转换芯片的内部开关管的导通状态或者所述开关电容转换芯片中充电电容的充电时间，控制降低所述无线充电接收装置的接收芯片的输出电压。
  12. 根据权利要求10所述的终端，其特征在于，所述处理器，还用于在进入恒压充电阶段时，输出用于控制所述开关电容转换芯片处于直通状态的第二控制指令；
    所述开关电容转换芯片，还用于根据所述第二控制指令处于直通状态。
  13. 一种充电系统，其特征在于，包括：无线充电发射装置、电池以及权利要求1-8中任一项所述的无线充电接收装置。
  14. 根据权利要求13所述的充电系统，其特征在于，所述充电系统还包括：处理器；
    所述开关电容转换芯片，还用于检测通路电流，并在所述通路电流大于或等于电流阈值与第一电流偏移量之和时，控制所述开关电容转换芯片进入限流模式，所述第一电流偏移量大于或等于0，且小于所述电流阈值；
    所述处理器，用于根据当前期望的通路电流，输出用于调节所述电流阈值的第一控制指令；
    所述开关电容转换芯片，还用于根据所述第一控制指令调节所述电流阈值。
  15. 根据权利要求14所述的充电系统，其特征在于，所述处理器，还用于根据所述开关电容转换芯片的内部开关管的导通电阻、所述电容转换芯片的内部开关管的导通状态或者所述开关电容转换芯片中充电电容的充电时间，控制降低所述无线充电接收装置的接收芯片的输出电压。
  16. 根据权利要求15所述的充电系统，其特征在于，所述处理器，还用于在进入恒压充电阶段时，输出用于控制所述开关电容转换芯片处于直通状态的第二控制指令；
    所述开关电容转换芯片，还用于根据所述第二控制指令处于直通状态。
  17. 根据权利要求13所述的充电系统，其特征在于，所述无线充电发射装置包括：充电器、发射芯片和发射线圈；所述发射芯片的输入端与所述充电器耦接，所述发射芯片的输出端与所述发射线圈耦接；
    所述发射芯片，用于基于控制协议与所述充电器通信，控制所述充电器输出的直流电源的电压，并将所述直流电源转换为交流电源；
    所述发射线圈，用于将所述交流电源转换成交变磁场。
PCT/CN2018/115420 2018-09-28 2018-11-14 无线充电接收装置、充电系统及终端 WO2020062481A1 (zh)

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