WO2021017404A1 - 无线充电的接收端电路及具有无线充电功能的电子设备 - Google Patents

无线充电的接收端电路及具有无线充电功能的电子设备 Download PDF

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Publication number
WO2021017404A1
WO2021017404A1 PCT/CN2019/129818 CN2019129818W WO2021017404A1 WO 2021017404 A1 WO2021017404 A1 WO 2021017404A1 CN 2019129818 W CN2019129818 W CN 2019129818W WO 2021017404 A1 WO2021017404 A1 WO 2021017404A1
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Prior art keywords
circuit
receiving end
load
adjustment signal
wireless charging
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English (en)
French (fr)
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张伟
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Goertek Inc
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Goertek Inc
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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

Definitions

  • the present invention relates to wireless charging technology. More specifically, the present invention relates to a receiving end circuit for wireless charging and an electronic device with wireless charging function.
  • wireless charging technology is expanding to the field of miniaturized consumer electronics products, such as TWS (True Wireless Stereo) headphones, smart watches, bracelets, etc.
  • TWS Truste Wireless Stereo
  • the wireless charging technology is based on the principle of electromagnetic induction. Taking a mobile phone with wireless charging function as an example, the electromagnetic induction between the resonant circuit in the wireless charging tray and the resonant circuit in the mobile phone is used to transfer energy to realize wireless charging of the mobile phone.
  • the receiving end circuit generally includes a resonant circuit, a rectifier circuit, and a receiving end control chip.
  • the resonant circuit generates an alternating current according to the induced magnetic field of the transmitting end circuit, and after rectification into a direct current, the receiving end controls the chip Output to the back-end circuit.
  • the receiving end chip (RX IC) is generally used to realize the charging power adjustment function. Specifically, the receiving end control chip transmits related communication signals to the transmitting end circuit by adjusting its resonance circuit. To adjust the energy power output by the transmitter circuit to the receiver circuit.
  • the receiver control chip whose model is IDT P9221 and model is CPS EC4026.
  • the receiving end control chip In the wireless charging process of electronic products, if the charging current is relatively small, the communication signal output by the control chip of the receiving end will be relatively weak, and the communication functions of the receiving end and the transmitting end will be affected. In order to cope with this situation, according to the existing wireless charging specifications, the receiving end control chip will increase the load inside the chip to enhance the communication signal. At this time, the receiving end control chip will quickly heat up, and the receiving end will not be used to control the stable operation of the chip.
  • the purpose of the present invention is to provide a new wireless charging receiver circuit scheme.
  • a receiving end circuit for wireless charging including a resonance circuit, a rectifier circuit, an adjustable load circuit, and a receiving end control chip;
  • the resonant circuit is used to generate an alternating current according to the induced magnetic field generated by the transmitting end circuit of the wireless charging; after the alternating current generated by the resonant circuit is converted into a direct current by the rectifier circuit, it is sent to the back end via the receiving end control chip Circuit output
  • the receiving end control chip is used to control the resonance circuit to transmit an energy adjustment signal to the transmitting end circuit, so as to adjust the output power of the transmitting end circuit to the receiving end circuit;
  • the adjustable load circuit is connected between the two output terminals of the rectifier circuit, and the adjustable load circuit is configured to perform load adjustment according to a load adjustment signal.
  • the load regulation signal includes a first regulation signal and a second regulation signal
  • the first regulation signal corresponds to a state where the wireless charging current is less than a preset current threshold
  • the second regulation signal corresponds to A state where the wireless charging current is greater than or equal to the preset current threshold
  • the adjustable load circuit is configured to increase the load when the load adjustment signal is a first adjustment signal, and to decrease the load when the load adjustment signal is a second adjustment signal.
  • the receiving end control chip is provided with a chip load adjustment module, and the receiving end control chip is configured to turn off the chip load adjustment module; or, the receiving end control chip is not provided with a chip load Adjustment module.
  • the load regulation signal comes from the receiving end control chip or comes from a back-end circuit.
  • the adjustable load circuit includes a controlled switch and a resistor connected in series; the controlled switch is configured to be turned on when the load regulation signal is the first regulation signal, and when the Disconnect when the load regulation signal is the second regulation signal.
  • the controlled switch includes a first MOS tube, and the gate of the first MOS tube is used to access the load regulation signal.
  • the thermal resistance of the resistor is smaller than the thermal resistance of the receiving end control chip.
  • the adjustable load circuit includes a second MOS tube, and the gate of the MOS tube is used to access the load regulation signal;
  • the second MOS transistor is configured to work in the variable resistance area when the load adjustment signal is the first adjustment signal, and to turn off when the load adjustment signal is the second adjustment signal.
  • the thermal resistance of the second MOS tube is smaller than the thermal resistance of the receiving end control chip.
  • an electronic device with a wireless charging function comprising the receiving end circuit as described in any of the preceding items.
  • an adjustable load circuit is provided outside the receiving end control chip, which can be used to avoid increasing the load inside the receiving end control chip, thereby ensuring the stability of the communication between the receiving end and the transmitting end.
  • reducing the temperature of the receiving end control chip is beneficial to the stable operation of the receiving end control chip.
  • Figure 1 shows a wireless charging receiver circuit provided by the first embodiment of the present invention
  • Figure 2 shows a wireless charging receiver circuit provided by a second embodiment of the present invention
  • Figure 3 shows a wireless charging receiver circuit provided by a third embodiment of the present invention
  • Fig. 4 shows a wireless charging receiving end circuit provided by a fourth embodiment of the present invention.
  • the wireless charging system involved in the embodiment of the present invention includes a transmitting terminal and a receiving terminal.
  • the transmitting terminal may be a wireless charging transmitter, such as a wireless charging pad.
  • the receiving end may be an electronic product with a wireless charging function, for example, a TWS headset with a wireless charging function, a smart watch, a bracelet, a mobile phone, etc.
  • Fig. 1 shows a wireless charging receiver circuit provided by the first embodiment of the present invention.
  • the receiving end circuit of the wireless charging includes a resonance circuit 100, a rectifying circuit 200, an adjustable load circuit 300, and a receiving end control chip 400.
  • the resonant circuit 100 is used to generate an alternating current according to the induced magnetic field generated by the transmitting end circuit of the wireless charging.
  • the alternating current generated by the resonance circuit 100 is converted into a direct current by the rectifier circuit 200, and the direct current output by the rectifier circuit 200 is output to the back-end circuit through the receiving end control chip 400.
  • the receiving end control chip 400 is used for controlling the resonance circuit 100 to transmit an energy adjustment signal to the transmitting end circuit, so as to adjust the output power of the transmitting end circuit to the receiving end circuit.
  • the adjustable load circuit 300 is connected between the rectifier circuit 200 and the receiving end control chip 400, and the adjustable load circuit 300 is configured to perform load adjustment according to the load adjustment signal.
  • the load regulation signal includes a first regulation signal and a second regulation signal.
  • the first adjustment signal corresponds to a state where the wireless charging current is less than a preset current threshold, which is referred to as a light load state hereinafter.
  • the second adjustment signal corresponds to a state where the wireless charging current is greater than or equal to a preset current threshold, which is referred to as a heavy load state hereinafter.
  • the adjustable load circuit 300 is configured to increase the load when the load adjustment signal is the first adjustment signal, and decrease the load when the load adjustment signal is the second adjustment signal.
  • the adjustable load adjustment circuit 300 When the electronic device being wirelessly charged is in a light-load state, the adjustable load adjustment circuit 300 increases the load under the control of the first adjustment signal to enhance the communication signal transmitted by the receiving end and maintain the stability of the communication between the receiving end and the transmitting end. It is no longer necessary to increase the load inside the wireless receiving control chip. When the electronic device being wirelessly charged is in a heavy load state, the adjustable load adjusting circuit 300 reduces the load under the control of the second adjusting signal, so as to avoid the influence on the wireless charging efficiency as much as possible.
  • the receiving end control chip 400 may no longer need to adjust the load of the chip itself.
  • the receiving end control chip 400 may be configured to turn off its chip load regulation module, that is, turn off its chip load regulation function.
  • Those skilled in the art can use multiple ways to turn off the chip load adjustment function, for example, it can be implemented by software or hardware or a combination of software and hardware, which is not specifically limited here.
  • the receiving end control chip 400 does not have a chip load adjustment module, that is, the receiving end control chip 400 omits the chip load adjustment module and does not provide the chip load adjustment function.
  • the load regulation signal may come from the receiving end control chip 400 or from the back-end circuit.
  • the current output from the output terminal of the resonance circuit 100, or the current output from the output terminal of the rectifier circuit 200, or the magnitude of the charging current provided by the receiving terminal control chip 400 to the back-end circuit can be detected. It is compared with the preset current threshold, and the corresponding load regulation signal is generated according to the comparison result.
  • Those skilled in the art can also obtain the value of the wireless charging current in other ways, and can set the preset current threshold according to the actual situation, which will not be described here.
  • an adjustable load circuit 300 is provided outside the receiving end control chip 400, which can be used to avoid increasing the load inside the receiving end control chip 400, thereby ensuring the efficiency of the receiving end and the transmitting end.
  • reducing the temperature of the receiving end control chip 400 is beneficial to the stable operation of the receiving end control chip 400.
  • the receiver circuit for wireless charging provided by the second embodiment of the present invention is described.
  • the resonance circuit 100 includes an inductor L1 and a capacitor C1 connected in series.
  • the rectifier circuit 200 adopts a bridge rectifier circuit, and includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor C3.
  • the capacitor C3 mainly plays a role in stabilizing.
  • the rectifier circuit 200 may also adopt other types or rectifier circuits of other circuit structures, which are not described here.
  • the voltage input pin IN of the receiving end control chip 400 is connected to the output end of the rectifier circuit 200, the ground pin GND is grounded, and the voltage output pin Out is connected to the back-end circuit.
  • the Vout port is schematically used to indicate the connection port of the back-end circuit, and the voltage output pin Out of the receiving end control chip 400 is connected to the Vout port of the back-end circuit.
  • the AC current generated by the resonance circuit 100 is converted into a DC current by the rectifier circuit 200, it can be further rectified by the receiving end control chip 400, and then output to the back-end circuit.
  • a capacitor C2 and a controlled switch S1 are also provided.
  • the capacitor C2 and the controlled switch S1 are connected in series to form a detection unit.
  • the controlled switch S1 is turned on and closed by the receiving end control chip 400.
  • the receiving end control chip 400 When the receiving end control chip 400 is powered on, the controlled switch S1 is turned off, and the capacitor C2 is connected.
  • the receiving end control chip 400 When the receiving end control chip 400 is powered off, the controlled switch S1 is turned on and the capacitor C2 is connected.
  • the wireless charging transmitter can detect whether a matching receiver is placed, thereby realizing the wireless charging function. How to implement the detection process specifically belongs to the well-known technology in the art, and will not be described here too much.
  • the adjustable load circuit 300 is connected between the two output terminals of the rectifier circuit 200.
  • the adjustable load circuit 300 includes a resistor R1 and a controlled switch S2 connected in series. One output terminal of the rectifier circuit 200 is grounded, one end of the resistor R1 is connected to the other output terminal of the rectifier circuit 200, and the controlled switch S2 is connected between the resistor R1 and the grounded output terminal of the rectifier circuit 200.
  • the controlled switch S2 is configured to be turned on or off according to the load regulation signal. Specifically, the controlled switch S2 is configured to be turned on when the load adjustment signal is the first adjustment signal, and turned off when the load adjustment signal is the second adjustment signal.
  • a resistor with a small thermal resistance should be selected as far as possible within the resistance range of the load to be increased.
  • the thermal resistance of the resistor R1 is smaller than the thermal resistance of the receiving end control chip 400.
  • the resistor R1 can be selected as follows: first, without the adjustable load circuit 300, calculate the heat generated by the load that the receiving end control chip 400 needs to increase under the light load state, Counted as the first heat. Then, when the adjustable load circuit 300 is provided, the heat generated by the resistor R1 in the light-load state is calculated as the second heat. The resistor R1 is selected so that the second heat is less than the first heat. The resistor R1 selected in this way will make the overall temperature rise of the electronic product during the wireless charging process lower than that of the traditional way.
  • FIG. 3 illustrate the third embodiment of the receiving end circuit for wireless charging.
  • the difference between the third embodiment and the second embodiment is that the controlled switch S2 is implemented by the first MOS transistor M1.
  • the gate of the first MOS transistor M1 is used to connect the load regulation signal, the drain is connected to the resistor R1, and the source is grounded.
  • the load adjustment signal is the first adjustment signal
  • the first MOS transistor M1 is turned on, and when the load adjustment signal is the second adjustment signal, the first MOS transistor M1 is turned off. It can be seen that the first MOS transistor M1 is used in the third embodiment to function as the controlled switch S1 in the second embodiment.
  • the first MOS transistor M1 in the third embodiment is an N-type MOS transistor.
  • a P-type MOS transistor can also be selected.
  • an adjustable load circuit 300 is provided outside the receiving end control chip 400, which can be used to avoid increasing the load inside the receiving end control chip 400, thereby ensuring the efficiency of the receiving end and the transmitting end.
  • reducing the temperature of the receiving end control chip 400 is beneficial to the stable operation of the receiving end control chip 400.
  • the adjustable load circuit 300 of the fourth embodiment includes a second MOS transistor M2.
  • the gate of the second MOS transistor M2 is used to connect the load regulation signal, the drain is connected to the voltage input pin IN of the receiving end control chip 400, and the source is grounded.
  • the second MOS transistor M2 is configured to work in the variable resistance area when the load adjustment signal is the first adjustment signal, and play a similar role to the resistor R1 in the second embodiment and the third embodiment.
  • the load regulation signal is the second regulation signal
  • the second MOS transistor M2 is turned off.
  • the second MOS transistor M2 in the fourth embodiment is an N-type MOS transistor.
  • a P-type MOS transistor can also be selected.
  • a resistor with a small thermal resistance should be selected as far as possible within the resistance range of the load to be increased.
  • the thermal resistance of the second MOS tube M2 is smaller than the thermal resistance of the receiving end control chip 400.
  • the second MOS transistor M2 can be selected in the following manner: First, when the adjustable load circuit 300 is not provided, calculate the load that the receiving end control chip 400 needs to increase in the light load state. The calories are counted as the first calories. Then, when the adjustable load circuit 300 is provided, the heat generated by the second MOS tube M2 in the light-load state is calculated as the third heat. The second MOS tube M2 is selected so that the third heat is smaller than the first heat. The second MOS tube M2 selected in this way will cause the overall temperature rise of the electronic product during the wireless charging process to be lower than that of the traditional way.
  • an adjustable load circuit 300 is provided outside the receiving end control chip 400, which can be used to avoid increasing the load inside the receiving end control chip 400, thereby ensuring the efficiency of the receiving end and the transmitting end.
  • reducing the temperature of the receiving end control chip 400 is beneficial to the stable operation of the receiving end control chip 400.
  • An embodiment of the present invention also provides an electronic device with a wireless charging function, and the electronic device includes any one of the wireless charging receiving end circuits in the foregoing embodiments.
  • the electronic device includes a control module and any wireless charging receiving end circuit in the foregoing embodiments.
  • the control module is configured to output a load regulation signal to the receiving end circuit of the wireless charging.
  • the control module can be implemented by a processor, such as a central processing unit CPU or a microprocessor MCU.
  • the electronic device may be an electronic product with a wireless charging function, for example, for example, a TWS headset, a smart watch, a bracelet, a mobile phone and the like with a wireless charging function.
  • a wireless charging function for example, for example, a TWS headset, a smart watch, a bracelet, a mobile phone and the like with a wireless charging function.
  • the receiving end control chip and control module mentioned in the embodiment of the present invention may include hardware circuits and software programs.
  • each control function can be realized by instructions in related circuits. How the instructions implement specific functions is a well-known technology in the art, and will not be discussed here.
  • the electronic device, the receiving end control chip, and the control module mentioned in the embodiments of the present invention may include a computer-readable storage medium on which a computer program is stored. When the computer program is executed, the response function is realized. Function is a well-known technology in the field, so I won't discuss it here.
  • the computer-readable storage medium may be a tangible device that can hold and store instructions used by the instruction execution device.
  • the computer readable storage medium may be, for example, but not limited to, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), static random access memory ( SRAM).

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

一种无线充电的接收端电路和一种具有无线充电功能的电子设备。所述接收端电路包括谐振电路（100）、整流电路（200）、可调节负载电路（300）、以及接收端控制芯片（400）；谐振电路（100）用于根据无线充电的发射端电路产生的感应磁场产生交流电流；谐振电路（100）产生的交流电流通过整流电路（200）转化为直流电流后，经由接收端控制芯片（400）向后端电路输出；可调节负载电路（300）连接在整流电路（200）的两个输出端之间，被配置为根据负载调节信号进行负载调整。

Description

无线充电的接收端电路及具有无线充电功能的电子设备 技术领域
本发明涉及无线充电技术，更具体地，本发明涉及无线充电的接收端电路以及具有无线充电功能的电子设备。
背景技术
目前，无线充电技术更多的向小型化消费电子产品领域扩展，比如TWS(真正无线立体声，True Wireless Stereo)耳机，智能手表，手环等。
无线充电技术基于电磁感应原理实现。以具有无线充电功能的手机为例，是利用无线充电盘内的谐振电路和手机内的谐振电路之间的电磁感应进行能量的传递，实现对手机的无线充电。
具有无线充电功能的电子产品，接收端电路一般包括谐振电路、整流电路、以及接收端控制芯片，谐振电路根据发射端电路的感应磁场产生交流电流，经整流为直流电流后，由接收端控制芯片向后端电路输出。
在对电子产品进行充电的整个过程中，需要根据电子产品的负载情况来调整充电功率。在具有无线充电功能的电子产品中，一般是利用接收端芯片(RX IC)来实现充电功率调整功能，具体的，接收端控制芯片通过调节其谐振电路来向发射端电路传递相关的通信信号，以调节发射端电路对接收端电路输出的能量功率。例如型号为IDT P9221和型号为CPS EC4026的接收端控制芯片。
在电子产品的无线充电过程中，充电电流比较小时，接收端控制芯片输出的通信信号会比较弱，接收端和发射端的通信功能会受到影响。为了应对这种情况，根据现有的无线充电规范标准，接收端控制芯片会在芯片内部增加负载以增强通信信号，此时接收端控制芯片会快速升温，不利用接收端控制芯片的稳定工作。
发明内容
本发明的目的在于提供一种新的无线充电的接收端电路方案。
根据本发明的第一方面，提供了一种无线充电的接收端电路，包括谐振电路、整流电路、可调节负载电路、以及接收端控制芯片；
所述谐振电路用于根据无线充电的发射端电路产生的感应磁场产生交流电流；所述谐振电路产生的交流电流通过所述整流电路转化为直流电流后，经由所述接收端控制芯片向后端电路输出；
所述接收端控制芯片用于控制所述谐振电路向所述发射端电路传递能量调节信号，以调节所述发射端电路对所述接收端电路输出能量的功率；
所述可调节负载电路连接在所述整流电路的两个输出端之间，所述可调节负载电路被配置为根据负载调节信号进行负载调整。
可选地或优选地，所述负载调节信号包括第一调节信号和第二调节信号，所述第一调节信号对应于无线充电电流小于预设电流阈值的状态，所述第二调节信号对应于无线充电电流大于等于所述预设电流阈值的状态；
所述可调节负载电路被配置为当所述负载调节信号为第一调节信号时增加负载，以及当所述负载调节信号为第二调节信号时降低负载。
可选地或优选地，所述接收端控制芯片设有芯片负载调节模块，所述接收端控制芯片被配置为关闭所述芯片负载调节模块；或者，所述接收端控制芯片不设有芯片负载调节模块。
可选地或优选地，所述负载调节信号来自于所述接收端控制芯片或者来自于后端电路。
可选地或优选地，所述可调节负载电路包括串联在一起的受控开关和电阻；所述受控开关被配置为当所述负载调节信号为第一调节信号时导通，当所述负载调节信号为第二调节信号时断开。
可选地或优选地，所述受控开关包括第一MOS管，所述第一MOS管的栅极用于接入所述负载调节信号。
可选地或优选地，所述电阻的热阻小于所述接收端控制芯片的热阻。
可选地或优选地，所述可调节负载电路包括第二MOS管，所述MOS管的栅极用于接入所述负载调节信号；
所述第二MOS管被配置为当所述负载调节信号为第一调节信号时工 作在可变电阻区，当所述负载调节信号为第二调节信号时截止。
可选地或优选地，所述第二MOS管的热阻小于所述接收端控制芯片的热阻。
根据本发明的第二方面，提供了一种具有无线充电功能的电子设备，所述电子设备包括如前任一项所述的接收端电路。
本发明实施例提供的无线充电的接收端电路，在接收端控制芯片外部设置可调节负载电路，可以用于避免在接收端控制芯片内部增加负载，从而在保证接收端和发射端的通信稳定性的基础上，降低接收端控制芯片的温度，有利于接收端控制芯片的稳定工作。
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例中所需要使用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示出了本发明第一实施例提供的无线充电的接收端电路；
图2示出了本发明第二实施例提供的无线充电的接收端电路；
图3示出了本发明第三实施例提供的无线充电的接收端电路；
图4示出了本发明第四实施例提供的无线充电的接收端电路。
具体实施方式
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨 论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
本发明实施例涉及的无线充电系统包括发射端和接收端，发射端可以是无线充电发射器，例如无线充电盘。接收端可以是具有无线充电功能的电子产品，例如，带无线充电功能的TWS耳机、智能手表，手环、手机等。
<第一实施例>
图1示出了本发明第一实施例提供的无线充电的接收端电路。该无线充电的接收端电路包括谐振电路100、整流电路200、可调节负载电路300、以及接收端控制芯片400。
谐振电路100用于根据无线充电的发射端电路产生的感应磁场产生交流电流。谐振电路100产生的交流电流通过整流电路200转化为直流电流，整流电路200输出的直流电流经由接收端控制芯片400向后端电路输出。接收端控制芯片400用于控制谐振电路100向发射端电路传递能量调节信号，以调节发射端电路对接收端电路输出能量的功率。
可调节负载电路300连接在整流电路200和接收端控制芯片400之间，可调节负载电路300被配置为根据负载调节信号进行负载调整。
负载调节信号包括第一调节信号和第二调节信号。第一调节信号对应于无线充电电流小于预设电流阈值的状态，下文称之为轻载状态。第二调节信号对应于无线充电电流大于等于预设电流阈值的状态，下文称之为重载状态。
可调节负载电路300被配置为当负载调节信号为第一调节信号时增加负载，当负载调节信号为第二调节信号时降低负载。
当正在无线充电的电子设备处于轻载状态时，可调节负载调节电路 300在第一调节信号的控制下增加负载，以增强接收端发射的通信信号，保持接收端和发射端通信的稳定性，可以不再需要在无线接收控制芯片的内部增加负载。当正在无线充电的电子设备处于重载状态时，可调节负载调节电路300在第二调节信号的控制下降低负载，以尽量避免对无线充电效率的影响。
根据上述实施例的方案，接收端控制芯片400可以不再需要调节芯片自身的负载。接收端控制芯片400可以被配置为关闭其芯片负载调节模块，即关闭其芯片负载调节功能。本领域技术人员可以采用多种方式实现关闭芯片负载调节功能，例如可以采用软件或者硬件或者软硬件结合的方式实现，这里不做具体限定。或者，接收端控制芯片400不设有芯片负载调节模块，即接收端控制芯片400省略芯片负载调节模块，不设置芯片负载调节功能。
负载调节信号可以来自于接收端控制芯片400或者来自于后端电路。在一个具体的例子中，可以侦测谐振电路100输出端输出的电流、或者侦测整流电路200输出端输出的电流、或者侦测接收端控制芯片400向后端电路提供的充电电流的大小，跟预设的电流阈值进行比较，根据比较结果生成对应的负载调节信号。本领域技术人员还可以通过其它方式获取到无线充电电流的数值，并且可以根据实际情况自行设定预设电流阈值，这里不再过多描述。
本发明实施例提供的无线充电的接收端电路，在接收端控制芯片400的外部设置可调节负载电路300，可以用于避免在接收端控制芯片400内部增加负载，从而在保证接收端和发射端的通信稳定性的基础上，降低接收端控制芯片400的温度，有利于接收端控制芯片400的稳定工作。
<第二实施例>
参见图2所示，说明本发明第二实施例提供的无线充电的接收端电路。
谐振电路100包括串联的电感L1和电容C1。
整流电路200采用桥式整流电路，包括二极管D1、二极管D2、二极管D3、二极管D4、以及电容C3。电容C3主要起稳压作用。整流电路200 还可以采用其它类型或者其它电路结构的整流电路，这里不再过多描述。
接收端控制芯片400的电压输入引脚IN与整流电路200的输出端连接，接地引脚GND接地，电压输出引脚Out与后端电路连接。图2中示意性的用Vout端口表示后端电路的连接端口，接收端控制芯片400的电压输出引脚Out与后端电路的Vout端口连接。
谐振电路100产生的交流电流通过整流电路200转化为直流电流后，可以经由接收端控制芯片400进一步整流，然后向后端电路输出。
在谐振电路100的两个输出端之间，还设有电容C2和受控开关S1。电容C2和受控开关S1之间为串联，构成侦测单元。受控开关S1由接收端控制芯片400控制导通和闭合。当接收端控制芯片400上电时，受控开关S1断开，电容C2接出。当接收端控制芯片400下电时，受控开关S1导通，电容C2接入。利用侦测单元，无线充电的发射端可以检测到是否放置了匹配的接收端，从而实现无线充电功能。具体如何实现检测过程，属于本领域公知技术，这里不再过多描述。
参见图2所示，可调节负载电路300连接在整流电路200的两个输出端之间。可调节负载电路300包括串联在一起的电阻R1和受控开关S2。整流电路200的一个输出端接地，电阻R1的一端与整流电路200的另一个输出端连接，受控开关S2连接在电阻R1和整流电路200的接地的输出端之间。
受控开关S2被配置为根据负载调节信号导通或者断开。具体的，受控开关S2被配置为当负载调节信号为第一调节信号时导通，当负载调节信号为第二调节信号时断开。
对于电阻R1来说，应该在满足需要增加的负载的阻值范围内尽量选择热阻小的电阻。在一个具体的例子中，电阻R1的热阻小于接收端控制芯片400的热阻。
在另一个具体的例子中，可以按照如下方式来来选择电阻R1：首先在没有设置可调节负载电路300的情况下，计算轻载状态下接收端控制芯片400需要增加的负载会产生的热量，计为第一热量。然后在设有可调节负载电路300的情况下，计算轻载状态下电阻R1会产生的热量，计为第二 热量。对电阻R1进行选型，使得第二热量小于第一热量。按照这种方式选择出的电阻R1，会使得电子产品在无线充电过程中的总体升温会比传统方式低。
<第三实施例>
参见图3所示说明无线充电的接收端电路的第三实施例。第三实施例和第二实施例的不同之处在于，受控开关S2采用第一MOS管M1实现。
在第三实施例中，第一MOS管M1的栅极用于接入负载调节信号，漏极与电阻R1连接，源极接地。当负载调节信号为第一调节信号时，第一MOS管M1导通，当负载调节信号为第二调节信号时，第一MOS管M1截止。可以看出，第三实施例中利用第一MOS管M1起到第二实施例中的受控开关S1的作用。
第三实施例中的第一MOS管M1为N型MOS管，当然，在其它实施例中，也可以选择P型MOS管。
本发明实施例提供的无线充电的接收端电路，在接收端控制芯片400的外部设置可调节负载电路300，可以用于避免在接收端控制芯片400内部增加负载，从而在保证接收端和发射端的通信稳定性的基础上，降低接收端控制芯片400的温度，有利于接收端控制芯片400的稳定工作。
<第四实施例>
参见图4所示说明无线充电的接收端电路的第四实施例。第四实施例的可调节负载电路300包括第二MOS管M2。
在第四实施例中，第二MOS管M2的栅极用于接入负载调节信号，漏极与接收端控制芯片400的电压输入引脚IN连接，源极接地。
第二MOS管M2被配置为当负载调节信号为第一调节信号时工作在可变电阻区，起到第二实施例、第三实施例中的电阻R1的类似作用。当负载调节信号为第二调节信号时，第二MOS管M2截止。
第四实施例中的第二MOS管M2为N型MOS管，当然，在其它实施例中，也可以选择P型MOS管。
对于第二MOS管M2来说，应该在满足需要增加的负载的阻值范围内尽量选择热阻小的电阻。在一个具体的例子中，第二MOS管M2的热阻小于接收端控制芯片400的热阻。
在另一个具体的例子中，可以按照如下方式来来选择第二MOS管M2：首先在没有设置可调节负载电路300的情况下，计算轻载状态下接收端控制芯片400需要增加的负载会产生的热量，计为第一热量。然后在设有可调节负载电路300的情况下，计算轻载状态下第二MOS管M2会产生的热量，计为第三热量。对第二MOS管M2进行选型，使得第三热量小于第一热量。按照这种方式选择出的第二MOS管M2，会使得电子产品在无线充电过程中的总体升温会比传统方式低。
本发明实施例提供的无线充电的接收端电路，在接收端控制芯片400的外部设置可调节负载电路300，可以用于避免在接收端控制芯片400内部增加负载，从而在保证接收端和发射端的通信稳定性的基础上，降低接收端控制芯片400的温度，有利于接收端控制芯片400的稳定工作。
<电子设备>
本发明实施例还提供一种具有无线充电功能的电子设备，该电子设备包括上述实施例中的任意一种无线充电的接收端电路。
在一个具体的例子中，该电子设备包括控制模块和上述实施例中的任意一种无线充电的接收端电路。控制模块被配置为向无线充电的接收端电路输出负载调节信号。控制模块可以采用处理器实现，例如中央处理器CPU或者微型处理器MCU。
在一个例子中，电子设备可以是带无线充电功能的电子产品，例如，例如，带无线充电功能的TWS耳机、智能手表，手环、手机等。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处，相关之处参见其它实施例的部分说明即可。
本发明实施例中提到的接收端控制芯片和控制模块，可以包括硬件电 路和软件程序。本发明实施例中提到的接收端控制芯片和控制模块，各项控制功能可以由相关电路中的指令实现，指令如何实现具体的功能是本领域公知技术，这里不再过多论述。
本发明实施例中提到的电子设备、接收端控制芯片和控制模块，可以包括计算机可读存储介质，其上存储有计算机程序，当计算机程序被执行时实现响应的功能，指令如何实现具体的功能是本领域公知技术，这里不再过多论述。计算机可读存储介质可以是可以保持和存储由指令执行设备使用的指令的有形设备。计算机可读存储介质例如可以是――但不限于――随机存取存储器(RAM)、只读存储器(ROM)、可擦式可编程只读存储器(EPROM或闪存)、静态随机存取存储器(SRAM)。
以上已经描述了本发明的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在最好地解释各实施例的原理、实际应用或对市场中的技术改进，或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。本发明的范围由所附权利要求来限定。

Claims (10)

  1. 一种无线充电的接收端电路，其特征在于，包括谐振电路、整流电路、可调节负载电路、以及接收端控制芯片；
    所述谐振电路用于根据无线充电的发射端电路产生的感应磁场产生交流电流；所述谐振电路产生的交流电流通过所述整流电路转化为直流电流后，经由所述接收端控制芯片向后端电路输出；
    所述接收端控制芯片用于控制所述谐振电路向所述发射端电路传递能量调节信号，以调节所述发射端电路对所述接收端电路输出能量的功率；
    所述可调节负载电路连接在所述整流电路的两个输出端之间，所述可调节负载电路被配置为根据负载调节信号进行负载调整。
  2. 根据权利要求1所述的接收端电路，所述负载调节信号包括第一调节信号和第二调节信号，所述第一调节信号对应于无线充电电流小于预设电流阈值的状态，所述第二调节信号对应于无线充电电流大于等于所述预设电流阈值的状态；
    所述可调节负载电路被配置为当所述负载调节信号为第一调节信号时增加负载，以及当所述负载调节信号为第二调节信号时降低负载。
  3. 根据权利要求1所述的接收端电路，其特征在于，所述接收端控制芯片设有芯片负载调节模块，所述接收端控制芯片被配置为关闭所述芯片负载调节模块；或者，所述接收端控制芯片不设有芯片负载调节模块。
  4. 根据权利要求1所述的接收端电路，其特征在于，所述负载调节信号来自于所述接收端控制芯片或者来自于后端电路。
  5. 根据权利要求2所述的接收端电路，其特征在于，所述可调节负载电路包括串联在一起的受控开关和电阻；所述受控开关被配置为当所述负 载调节信号为第一调节信号时导通，当所述负载调节信号为第二调节信号时断开。
  6. 根据权利要求5所述的接收端电路，其特征在于，所述受控开关包括第一MOS管，所述第一MOS管的栅极用于接入所述负载调节信号。
  7. 根据权利要求5所述的接收端电路，其特征在于，所述电阻的热阻小于所述接收端控制芯片的热阻。
  8. 根据权利要求2所述的接收端电路，其特征在于，所述可调节负载电路包括第二MOS管，所述MOS管的栅极用于接入所述负载调节信号；
    所述第二MOS管被配置为当所述负载调节信号为第一调节信号时工作在可变电阻区，当所述负载调节信号为第二调节信号时截止。
  9. 根据权利要求8所述的接收端电路，其特征在于，所述第二MOS管的热阻小于所述接收端控制芯片的热阻。
  10. 一种具有无线充电功能的电子设备，其特征在于，包括根据权利要求1-9任一项所述的接收端电路。
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