WO2023115793A1 - 一种用于无线充电系统倍压启动自适应保护电路及方法 - Google Patents

一种用于无线充电系统倍压启动自适应保护电路及方法 Download PDF

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WO2023115793A1
WO2023115793A1 PCT/CN2022/092586 CN2022092586W WO2023115793A1 WO 2023115793 A1 WO2023115793 A1 WO 2023115793A1 CN 2022092586 W CN2022092586 W CN 2022092586W WO 2023115793 A1 WO2023115793 A1 WO 2023115793A1
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voltage
circuit
resistor
wireless charging
charging system
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PCT/CN2022/092586
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English (en)
French (fr)
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侯森林
王建平
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成都市易冲半导体有限公司
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Priority to US18/003,628 priority Critical patent/US20240039274A1/en
Priority to KR1020237004028A priority patent/KR20230098129A/ko
Publication of WO2023115793A1 publication Critical patent/WO2023115793A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection

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  • the present invention relates to the technical field of wireless charging, in particular to an adaptive protection circuit and method for voltage doubling startup of a wireless charging system.
  • a low-inductance coil is selected to reduce the coil impedance, thereby improving the current flow capacity and achieving the purpose of increasing power.
  • the reduction of the coil inductance will lead to a decrease in the coupling voltage, resulting in a decrease in the degree of freedom of charging.
  • the double-voltage start-up method can be used to ensure that the chip can be turned on normally.
  • the voltage doubling startup method can solve the low-voltage startup problem, but it will also bring another problem. In the voltage doubling mode, quickly picking and placing the receiving end (RX) will raise the input voltage (vrect) of the receiving end to a high level, which may burn out the receiving end. terminal risk.
  • the purpose of the present invention is to provide an adaptive protection circuit and method for wireless charging system voltage doubling startup, to solve the problem of quickly picking and placing the receiving end when the wireless charging system is starting to double the voltage, which will raise the input voltage of the receiving end to a high level, thus causing burnout The issue of risk on the receiving end.
  • An adaptive protection method for voltage doubling startup of a wireless charging system is to control the voltage doubling logic control module of the voltage doubling startup circuit by detecting the input voltage vrect of the receiving end of the wireless charging system to send a signal to exit the doubling voltage mode.
  • the self-adaptive protection circuit for wireless charging system voltage doubling startup that implements the method includes clamping circuit 1, clamping circuit 2, clamping circuit 3, resistor R1, resistor R2, resistor R3, switch tube NM1, switch Tube NM2, Schmitt trigger and NOT gate circuit;
  • the input voltage vrect of the receiving end of the wireless charging system is sequentially connected to the common ground terminal VSS through clamping circuit 1, clamping circuit 2, clamping circuit 3, resistor R1 and resistor R2; between clamping circuit 1 and clamping circuit 2
  • the electrical connection point of the resistor R1 is connected to the drain of the switch tube NM2; the electrical connection point between the resistor R1 and the resistor R2 is connected to the source of the switch tube NM2 on the one hand, and connected to the gate of the switch tube NM1 on the other hand; the switch tube
  • the source of NM1 is connected to the common ground terminal VSS;
  • the drain of the switch tube NM1 is connected to one end of the resistor R3 on the one hand, and the input end of the Schmitt trigger on the other hand;
  • the other end of the resistor R3 is connected to the Schmitt trigger and non-
  • the power supply terminal of the gate circuit; the output terminal of the Schmitt trigger is connected to the voltage doubler logic control module of the voltage doubler
  • the working method for the wireless charging system voltage doubling startup adaptive protection circuit includes:
  • vc1 is the clamping voltage of clamping circuit 1
  • vc2 is the clamping voltage of clamping circuit 2
  • vc3 is the clamping voltage of clamping circuit 3
  • V0 is the input A low-voltage power supply generated by the voltage vrect supplies power for the Schmitt trigger and the NOT gate circuit.
  • the drain of the switching tube NM1 is pulled up to the low-voltage power supply V0 through the resistor R3; the input terminal of the facility Mitte trigger is point A;
  • the present invention provides an adaptive protection circuit for voltage doubling startup of a wireless charging system, including clamping circuit 1, clamping circuit 2, clamping circuit 3, resistor R1, resistor R2, resistor R3, switch tube NM1 , switching tube NM2, Schmitt trigger and NOT gate circuit;
  • the input voltage vrect of the receiving end of the wireless charging system is sequentially connected to the common ground terminal VSS through clamping circuit 1, clamping circuit 2, clamping circuit 3, resistor R1 and resistor R2; between clamping circuit 1 and clamping circuit 2
  • the electrical connection point of the resistor R1 is connected to the drain of the switch tube NM2; the electrical connection point between the resistor R1 and the resistor R2 is connected to the source of the switch tube NM2 on the one hand, and connected to the gate of the switch tube NM1 on the other hand; the switch tube
  • the source of NM1 is connected to the common ground terminal VSS;
  • the drain of the switch tube NM1 is connected to one end of the resistor R3 on the one hand, and the input end of the Schmitt trigger on the other hand;
  • the other end of the resistor R3 is connected to the Schmitt trigger and non-
  • the power supply terminal of the gate circuit; the output terminal of the Schmitt trigger is connected to the voltage doubler logic control module of the voltage doubler
  • the present invention also provides a receiving end of a wireless charging system.
  • the receiving end includes a voltage doubling startup circuit and the above-mentioned self-adaptive protection circuit for a wireless charging system voltage doubling startup.
  • the present invention also provides a wireless charging system, including a transmitting end and the above-mentioned receiving end.
  • the present invention controls the voltage doubler logic control module of the voltage doubler startup circuit by detecting the input voltage vrect of the receiving end of the wireless charging system to issue a signal to exit the voltage doubler mode, which can prevent the input voltage vrect from rising too high in the doubler voltage mode and damage the wireless charging system the receiving end.
  • the present invention can also automatically fall back to the voltage doubler mode after the input voltage vrect decreases.
  • the circuit of the present invention is simple, hysteresis is adjustable, and the response speed is fast, and the protection ability for the receiving end is strong, especially in the scene where the receiving end is quickly picked and placed in the double voltage mode, the protection effect is obvious.
  • Figure 1 is a structural diagram of a wireless charging system.
  • Figure 2 is a structural diagram of the voltage doubler startup circuit.
  • FIG. 3 is a structural diagram of an adaptive protection circuit for voltage doubling startup in a wireless charging system according to an embodiment of the present invention.
  • the wireless charging system shown in Figure 1 includes a transmitting end and a receiving end; the energy of the transmitting end and the receiving end is transmitted by a coil, and the two coils of the transmitting end and the receiving end are approximately loosely coupled transformers, and the voltage of the receiving end depends on the voltage of the transmitting end, Coupling coefficient, and the inductance of the coils at the transmitter and receiver.
  • a low-inductance coil is selected to reduce the coil impedance, thereby improving the current flow capacity and achieving the purpose of increasing power.
  • the reduction of the coil inductance will lead to a decrease in the coupling voltage, resulting in a decrease in the degree of freedom of charging. When the coupling is poor, the normal start-up voltage of the chip cannot be satisfied.
  • the double-voltage start-up circuit shown in Figure 2 can be used to realize the double-voltage start-up to ensure that the chip can be turned on normally.
  • the voltage doubler starting circuit includes a voltage doubler logic control module, a switch tube Q1, a switch tube Q2, a switch tube Q3, a switch tube Q4, a capacitor C and an inductance L; the switch tube Q1, the switch tube Q2, the switch tube Q3 and the switch tube Q4
  • the rectifier circuit SR is formed; the voltage doubler logic control module can control the switch tube Q2 or the switch tube Q4 to be turned on all the time, so that the rectifier circuit SR works in the voltage doubler mode; in the voltage doubler mode, the input voltage vrect will be higher than that of the full bridge mode (switch Tube Q2 and switching tube Q4 are turned on alternately) and the voltage is twice as high, so quickly picking and placing the receiving end (RX) will raise the input voltage (vrect) of
  • this embodiment proposes an adaptive protection circuit and method for voltage doubling startup of a wireless charging system.
  • the method is to control the voltage doubling logic of the voltage doubling startup circuit by detecting the input voltage vrect of the receiving end of the wireless charging system
  • the control module sends out a signal to exit the voltage doubler mode.
  • this embodiment implements an adaptive protection circuit for voltage doubling startup of a wireless charging system, including clamping circuit 1, clamping circuit 2, clamping circuit 3, resistor R1, Resistor R2, resistor R3, switch tube NM1, switch tube NM2, Schmitt trigger and NOT gate circuit;
  • the input voltage vrect of the receiving end of the wireless charging system is sequentially connected to the common ground terminal VSS through clamping circuit 1, clamping circuit 2, clamping circuit 3, resistor R1 and resistor R2; between clamping circuit 1 and clamping circuit 2
  • the electrical connection point of the resistor R1 is connected to the drain of the switch tube NM2; the electrical connection point between the resistor R1 and the resistor R2 is connected to the source of the switch tube NM2 on the one hand, and connected to the gate of the switch tube NM1 on the other hand; the switch tube
  • the source of NM1 is connected to the common ground terminal VSS;
  • the drain of the switch tube NM1 is connected to one end of the resistor R3 on the one hand, and the input end of the Schmitt trigger on the other hand;
  • the other end of the resistor R3 is connected to the Schmitt trigger and non-
  • the power supply terminal of the gate circuit; the output terminal of the Schmitt trigger is connected to the voltage doubler logic control module of the voltage doubler
  • the above-mentioned working method for the wireless charging system voltage doubling startup adaptive protection circuit includes:
  • vc1 is the clamping voltage of clamping circuit 1
  • vc2 is the clamping voltage of clamping circuit 2
  • vc3 is the clamping voltage of clamping circuit 3
  • V0 is the input A low-voltage power supply generated by the voltage vrect supplies power for the Schmitt trigger and the NOT gate circuit.
  • the drain of the switching tube NM1 is pulled up to the low-voltage power supply V0 through the resistor R3; the input terminal of the facility Mitte trigger is point A;
  • a receiving end of a wireless charging system can also be implemented.
  • the self-adaptive protection circuit is activated when the wireless charging system doubles the voltage.
  • a wireless charging system can also be realized, and the wireless charging system includes a transmitting end and a receiving end as described in Embodiment 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

提供一种用于无线充电系统倍压启动自适应保护电路及方法，通过检测无线充电系统的接收端的输入电压vrect来控制倍压启动电路的倍压逻辑控制模块发出退出倍压模式信号，能够防止倍压模式下输入电压vrect上升很高损坏无线充电系统的接收端。

Description

一种用于无线充电系统倍压启动自适应保护电路及方法
相关申请的交叉引用
本申请要求2021年12月22日提交的中国申请号为2021115782603、名称为“一种用于无线充电系统倍压启动自适应保护电路及方法”的优先权，本公开参考引用了前述申请的全部内容。
技术领域
本发明涉及无线充电技术领域，具体而言，涉及一种用于无线充电系统倍压启动自适应保护电路及方法。
背景技术
随着无线充电功率的持续提升，充电电流持续增加。为了降低线圈带来的损耗，选择低感量的线圈来减小线圈阻抗，从而提升通流能力，达到提高功率的目的。但是线圈感量的降低，会导致耦合的电压变小，导致充电自由度变小，耦合较差时，无法满足芯片正常启动的电压。为了解决低感量线圈低压启动问题，可以采用倍压启动方式，保证芯片可以正常开机。倍压启动方式可以解决低压启动问题，但是也会带来另一个问题，在倍压模式下，快速拿放接收端(RX)会把接收端的输入电压(vrect)抬升很高，有烧坏接收端的风险。
发明内容
本发明旨在提供一种用于无线充电系统倍压启动自适应保护电路及方法，以解决无线充电系统倍压启动时快速拿放接收端会把接收端的输入电压抬升很高，从而有烧坏接收端的风险的问题。
本发明提供的一种用于无线充电系统倍压启动自适应保护方法为通过检测无线充电系统的接收端的输入电压vrect来控制倍压启动电路的倍压逻辑控制模块发出退出倍压模式信号。
进一步的，实现所述方法的用于无线充电系统倍压启动自适应保护电路包括钳位电路一、钳位电路二、钳位电路三、电阻R1、电阻R2、电阻R3、开关管NM1、开关管NM2、施密特触发器和非门电路；
所述无线充电系统的接收端的输入电压vrect依次经钳位电路一、钳位电路二、钳位电路三、电阻R1和电阻R2连接公共接地端VSS；钳位电路一和钳位电路二之间的电性连接点连接至开关管NM2的漏极；电阻R1和电阻R2之间的电性连接点一方面连接至开关管NM2的源极，另一方面连接开关管NM1的栅极；开关管NM1的源极连接公共接地端VSS；开关管NM1的漏极一方面连接电阻R3的一端，另一方面连接施密特触发器的输入端；电阻R3的另一端连接施密特触发器和非门电路的供电端；施密特触发器的输出端经非门电路连接倍压启动电路的倍压逻辑控制模块；施密特触发器与非门电路之间的电性连接点连接开关管NM2的栅极。
所述用于无线充电系统倍压启动自适应保护电路的工作方法包括：
无线充电系统的接收端的输入电压vrect经过钳位电路一、钳位电路二和钳位电路三后，在开关管NM1的栅极产生一个开关管NM1的开关控制电压vgate＝(vrect-vc1-vc2-vc3)×R2/(R1+R2)；其中，vc1为钳位电路一的钳位电压，vc2为钳位电路二的钳位电压，vc3为钳位电路三的钳位电压；V0为输入电压vrect产生的一个低压电源，为施密特触发器和非门电路供电，开关管NM1的漏极经电阻R3上拉到低压电源V0；设施密特触发器的输入端为A点；
当输入电压vrect升高直至开关控制电压vgate能够打开开关管NM1以后，A点电压会被拉低，并经过施密特触发器和非门电路以后，非门电路的输出信号vrect_start_ov为高电平，将高电平的输出信号vrect_start_ov输入倍压逻辑控制模块，以控制倍压逻辑控制模块发出退出倍压模式信号；
当输出信号vrect_start_ov变为高电平以后，开关控制电压vgate＝vrect-vc1，且当vrect-vc1>V0-Vth2时，其中Vth2为开关管NM2的 阈值电压，开关控制电压vgate会被钳位到V0-Vth2；随着输入电压vrect降低，开关控制电压vgate也会降低，直到开关管NM1关闭，A点电压被电阻R3上拉到V0，输出信号vrect_start_ov由高电平变为低电平，进而控制倍压逻辑控制模块发出进入倍压模式信号。
由此，本发明提供的一种用于无线充电系统倍压启动自适应保护电路，包括钳位电路一、钳位电路二、钳位电路三、电阻R1、电阻R2、电阻R3、开关管NM1、开关管NM2、施密特触发器和非门电路；
所述无线充电系统的接收端的输入电压vrect依次经钳位电路一、钳位电路二、钳位电路三、电阻R1和电阻R2连接公共接地端VSS；钳位电路一和钳位电路二之间的电性连接点连接至开关管NM2的漏极；电阻R1和电阻R2之间的电性连接点一方面连接至开关管NM2的源极，另一方面连接开关管NM1的栅极；开关管NM1的源极连接公共接地端VSS；开关管NM1的漏极一方面连接电阻R3的一端，另一方面连接施密特触发器的输入端；电阻R3的另一端连接施密特触发器和非门电路的供电端；施密特触发器的输出端经非门电路连接倍压启动电路的倍压逻辑控制模块；施密特触发器与非门电路之间的电性连接点连接开关管NM2的栅极。
本发明还提供一种无线充电系统的接收端，所述接收端包括倍压启动电路以及上述的用于无线充电系统倍压启动自适应保护电路。
本发明还提供一种无线充电系统，包括发射端以及上述的接收端。
综上所述，由于采用了上述技术方案，本发明的有益效果是：
1、本发明通过检测无线充电系统的接收端的输入电压vrect来控制倍压启动电路的倍压逻辑控制模块发出退出倍压模式信号，能够防止倍压模式下输入电压vrect上升很高损坏无线充电系统的接收端。
2、本发明还能够在输入电压vrect降低以后又自动回退到倍压模式。
3、本发明电路简易、迟滞可调、响应速度快，对接收端保护能力强，尤其在倍压模式下快速拿放接收端场景下保护效果明显。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例中的附图作简单地介绍，应当理解，以下附图仅示出了本发明的某些实施例，因此不应被看作是对范围的限定，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相关的附图。
图1为无线充电系统的结构图。
图2为倍压启动电路的结构图。
图3为本发明实施例的用于无线充电系统倍压启动自适应保护电路的结构图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，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一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本发明的实施例的详细描述并非旨在限制要求保护的本发明的范围，而是仅仅表示本发明的选定实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示的无线充电系统包括发射端和接收端；发射端与接收端的能量靠线圈来传输，发射端与接收端的两个线圈近似为松耦合变压器，接收端的电压取决于发射端电压、耦合系数、以及发射端和接收端的线圈的感量大小。为了降低线圈带来的损耗，选择低感量的线圈来减小线圈阻抗，从而提升通流能力，达到提高功率的目的。但是线圈感量的降低，会导致 耦合的电压变小，导致充电自由度变小，耦合较差时，无法满足芯片正常启动的电压。
为了解决低感量线圈低压启动问题，可以采用如图2所示的倍压启动电路来实现倍压启动，保证芯片可以正常开机。该倍压启动电路包括倍压逻辑控制模块、开关管Q1、开关管Q2、开关管Q3、开关管Q4、电容C和电感L；由开关管Q1、开关管Q2、开关管Q3和开关管Q4组成整流器电路SR；倍压逻辑控制模块可以控制开关管Q2或开关管Q4一直导通，从而让整流器电路SR工作与倍压模式；在倍压模式下，输入电压vrect会比全桥模式(开关管Q2和开关管Q4交替导通)下电压高一倍，因此快速拿放接收端(RX)会把接收端的输入电压(vrect)抬升很高，有烧坏接收端的风险。
实施例1
针对上述问题，本实施例提出一种用于无线充电系统倍压启动自适应保护电路及方法，所述方法为通过检测无线充电系统的接收端的输入电压vrect来控制倍压启动电路的倍压逻辑控制模块发出退出倍压模式信号。为了实现该方法，如图3所示，本实施例实现了一种用于无线充电系统倍压启动自适应保护电路，包括钳位电路一、钳位电路二、钳位电路三、电阻R1、电阻R2、电阻R3、开关管NM1、开关管NM2、施密特触发器和非门电路；
所述无线充电系统的接收端的输入电压vrect依次经钳位电路一、钳位电路二、钳位电路三、电阻R1和电阻R2连接公共接地端VSS；钳位电路一和钳位电路二之间的电性连接点连接至开关管NM2的漏极；电阻R1和电阻R2之间的电性连接点一方面连接至开关管NM2的源极，另一方面连接开关管NM1的栅极；开关管NM1的源极连接公共接地端VSS；开关管NM1的漏极一方面连接电阻R3的一端，另一方面连接施密特触发器的输入端；电阻R3的另一端连接施密特触发器和非门电路的供电端；施密特触发器的输出端经非门电路连接倍压启动电路的倍压逻辑控制模块；施密特 触发器与非门电路之间的电性连接点连接开关管NM2的栅极。
上述用于无线充电系统倍压启动自适应保护电路的工作方法包括：
无线充电系统的接收端的输入电压vrect经过钳位电路一、钳位电路二和钳位电路三后，在开关管NM1的栅极产生一个开关管NM1的开关控制电压vgate＝(vrect-vc1-vc2-vc3)×R2/(R1+R2)；其中，vc1为钳位电路一的钳位电压，vc2为钳位电路二的钳位电压，vc3为钳位电路三的钳位电压；V0为输入电压vrect产生的一个低压电源，为施密特触发器和非门电路供电，开关管NM1的漏极经电阻R3上拉到低压电源V0；设施密特触发器的输入端为A点；
当输入电压vrect升高直至开关控制电压vgate能够打开开关管NM1以后，A点电压会被拉低，并经过施密特触发器和非门电路以后，非门电路的输出信号vrect_start_ov为高电平，将高电平的输出信号vrect_start_ov输入倍压逻辑控制模块，以控制倍压逻辑控制模块发出退出倍压模式信号，从而防止输入电压vrect升到更高损坏无线充电系统的接收端(RX)；
当输出信号vrect_start_ov变为高电平以后，开关控制电压vgate＝vrect-vc1，且当vrect-vc1>V0-Vth2时，其中Vth2为开关管NM2的阈值电压，开关控制电压vgate会被钳位到V0-Vth2；随着输入电压vrect降低，开关控制电压vgate也会降低，直到开关管NM1关闭，A点电压被电阻R3上拉到V0，输出信号vrect_start_ov由高电平变为低电平，进而控制倍压逻辑控制模块发出进入倍压模式信号，让整流器电路SR工作与倍压模式。
实施例2
基于实施例1所述的用于无线充电系统倍压启动自适应保护电路，还可以实现一种无线充电系统的接收端，所述接收端包括倍压启动电路以及如实施例1所述的用于无线充电系统倍压启动自适应保护电路。
实施例3
基于实施例2所述的无线充电系统的接收端，还可以实现一种无线充电系统，所述无线充电系统包括发射端以及如实施例2所述的接收端。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (6)

  1. 一种用于无线充电系统倍压启动自适应保护方法，其特征在于，所述方法为通过检测无线充电系统的接收端的输入电压vrect来控制倍压启动电路的倍压逻辑控制模块发出退出倍压模式信号。
  2. 根据权利要求1所述的用于无线充电系统倍压启动自适应保护方法，其特征在于，实现所述方法的用于无线充电系统倍压启动自适应保护电路包括钳位电路一、钳位电路二、钳位电路三、电阻R1、电阻R2、电阻R3、开关管NM1、开关管NM2、施密特触发器和非门电路；
    所述无线充电系统的接收端的输入电压vrect依次经钳位电路一、钳位电路二、钳位电路三、电阻R1和电阻R2连接公共接地端VSS；钳位电路一和钳位电路二之间的电性连接点连接至开关管NM2的漏极；电阻R1和电阻R2之间的电性连接点一方面连接至开关管NM2的源极，另一方面连接开关管NM1的栅极；开关管NM1的源极连接公共接地端VSS；开关管NM1的漏极一方面连接电阻R3的一端，另一方面连接施密特触发器的输入端；电阻R3的另一端连接施密特触发器和非门电路的供电端；施密特触发器的输出端经非门电路连接倍压启动电路的倍压逻辑控制模块；施密特触发器与非门电路之间的电性连接点连接开关管NM2的栅极。
  3. 根据权利要求1所述的用于无线充电系统倍压启动自适应保护方法，其特征在于，所述用于无线充电系统倍压启动自适应保护电路的工作方法包括：
    无线充电系统的接收端的输入电压vrect经过钳位电路一、钳位电路二和钳位电路三后，在开关管NM1的栅极产生一个开关管NM1的开关控制电压vgate＝(vrect-vc1-vc2-vc3)×R2/(R1+R2)；其中，vc1为钳位电路一的钳位电压，vc2为钳位电路二的钳位电压，vc3为钳位电路三的钳位电压；V0为输入电压vrect产生的一个低压电源，为施密特触发器和非门电路供电， 开关管NM1的漏极经电阻R3上拉到低压电源V0；设施密特触发器的输入端为A点；
    当输入电压vrect升高直至开关控制电压vgate能够打开开关管NM1以后，A点电压会被拉低，并经过施密特触发器和非门电路以后，非门电路的输出信号vrect_start_ov为高电平，将高电平的输出信号vrect_start_ov输入倍压逻辑控制模块，以控制倍压逻辑控制模块发出退出倍压模式信号；
    当输出信号vrect_start_ov变为高电平以后，开关控制电压vgate＝vrect-vc1，且当vrect-vc1>V0-Vth2时，其中Vth2为开关管NM2的阈值电压，开关控制电压vgate会被钳位到V0-Vth2；随着输入电压vrect降低，开关控制电压vgate也会降低，直到开关管NM1关闭，A点电压被电阻R3上拉到V0，输出信号vrect_start_ov由高电平变为低电平，进而控制倍压逻辑控制模块发出进入倍压模式信号。
  4. 一种用于无线充电系统倍压启动自适应保护电路，其特征在于，包括钳位电路一、钳位电路二、钳位电路三、电阻R1、电阻R2、电阻R3、开关管NM1、开关管NM2、施密特触发器和非门电路；
    所述无线充电系统的接收端的输入电压vrect依次经钳位电路一、钳位电路二、钳位电路三、电阻R1和电阻R2连接公共接地端VSS；钳位电路一和钳位电路二之间的电性连接点连接至开关管NM2的漏极；电阻R1和电阻R2之间的电性连接点一方面连接至开关管NM2的源极，另一方面连接开关管NM1的栅极；开关管NM1的源极连接公共接地端VSS；开关管NM1的漏极一方面连接电阻R3的一端，另一方面连接施密特触发器的输入端；电阻R3的另一端连接施密特触发器和非门电路的供电端；施密特触发器的输出端经非门电路连接倍压启动电路的倍压逻辑控制模块；施密特触发器与非门电路之间的电性连接点连接开关管NM2的栅极。
  5. 一种无线充电系统的接收端，其特征在于，所述接收端包括倍压启动电路以及如权利要求4所述的用于无线充电系统倍压启动自适应保护电路。
  6. 一种无线充电系统，其特征在于，包括发射端以及如权利要求5所述的接收端。
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