CN220066962U - Wireless charging receiving circuit, wireless charging system and electronic equipment - Google Patents

Abstract

The utility model provides a wireless charging receiving circuit, a wireless charging system and electronic equipment. The wireless charging receiving circuit comprises a battery, a resonance receiving circuit, a rectifying circuit, a grounding end, a voltage stabilizing capacitor and a switching circuit. The resonance receiving circuit is connected with the battery and is used for receiving electromagnetic signals of the wireless charging transmitting circuit and converting the electromagnetic signals into alternating voltage. The input end of the rectifying circuit is connected with the resonance receiving circuit, and the output end of the rectifying circuit is connected with the battery and used for rectifying the alternating current voltage output by the resonance receiving circuit into direct current voltage. The voltage stabilizing capacitor is connected between the output end of the rectifying circuit and the grounding end. The switching circuit and the voltage stabilizing capacitor are connected in series between the output end of the rectifying circuit and the grounding end; when the wireless charging receiving circuit is in a communication state, the switch circuit is disconnected; when the wireless charging receiving circuit is in an electric energy transmission state, the switch circuit is conducted. Therefore, the capacitor howling of the voltage stabilizing capacitor in a communication state can be reduced, and the cost is low.

Description

Wireless charging receiving circuit, wireless charging system and electronic equipment

Technical Field

The present utility model relates to the field of wireless charging technologies, and in particular, to a wireless charging receiving circuit, a wireless charging system, and an electronic device.

Background

With the development of wireless charging technology, more and more electronic devices increase wireless charging functions.

However, the deformation of the voltage-stabilizing capacitor on the wireless charging circuit board can lead to the vibration of the circuit board, and if the vibration frequency of the circuit board is in the audible range of the human ear, the user can hear the capacitor whistle, so that the use experience of the user is affected.

Disclosure of Invention

The utility model provides a wireless charging receiving circuit, a wireless charging system and electronic equipment, which can reduce capacitance squeal.

One aspect of the present utility model provides a wireless charging reception circuit including:

a battery;

the resonance receiving circuit is connected with the battery and is used for receiving electromagnetic signals of the wireless charging transmitting circuit and converting the electromagnetic signals into alternating voltage;

the input end of the rectifying circuit is connected with the resonance receiving circuit, the output end of the rectifying circuit is connected with the battery, and the rectifying circuit is used for rectifying the alternating voltage output by the resonance receiving circuit into direct voltage;

a grounding end;

the voltage stabilizing capacitor is connected between the output end of the rectifying circuit and the grounding end;

the switching circuit is connected in series with the voltage stabilizing capacitor and is arranged between the output end of the rectifying circuit and the grounding end; when the wireless charging receiving circuit is in a communication state, the switching circuit is in a first state, and the switching circuit disconnects a loop from the output end of the rectifying circuit to the grounding end; when the wireless charging receiving circuit is in an electric energy transmission state, the switching circuit is in a second state, and the switching circuit is communicated with a loop from the output end of the rectifying circuit to the grounding end.

The wireless charging receiving circuit provided by the embodiment of the utility model comprises the switch circuit which is connected in series with the voltage stabilizing capacitor between the output end of the rectifying circuit and the grounding end, and the switch circuit is used for controlling the on-off of the voltage stabilizing capacitor and the rectifying circuit or the voltage stabilizing capacitor and the grounding end, so that capacitor howling caused by the change of electric fields at two ends of the voltage stabilizing capacitor when the wireless charging receiving circuit is in a communication state can be avoided or reduced to a certain extent, the possibility that a user hears board vibration noise is reduced, the user experience is improved, and the cost is lower.

Further, the switch circuit is connected between the voltage stabilizing capacitor and the grounding end; when the switch circuit is in the first state, the voltage stabilizing capacitor is disconnected from the grounding end; when the switch circuit is in the second state, the voltage stabilizing capacitor is communicated with the grounding end.

Further, the switch circuit is connected between the voltage stabilizing capacitor and the rectifying circuit; when the switching circuit is in the first state, the voltage stabilizing capacitor is disconnected from the rectifying circuit; when the switch circuit is in the second state, the voltage stabilizing capacitor is communicated with the rectifying circuit.

Further, the switching circuit includes a first end and a second end, and the switching circuit is in the first state when the first end and the second end are disconnected; when the first end and the second end are communicated, the switch circuit is in the second state; the first end is connected between the output end of the rectifying circuit and the battery, and the second end is connected with the voltage stabilizing capacitor.

Further, the switching circuit includes a first end and a second end, and the switching circuit is in the first state when the first end and the second end are disconnected; when the first end and the second end are communicated, the switch circuit is in the second state; the first end is connected with the output end of the rectifying circuit, the second end is connected with the voltage stabilizing capacitor, and the second end is connected with the battery; when the switch circuit is in the first state, the battery is disconnected from the rectifying circuit; when the switch circuit is in the second state, the battery is connected with the rectifying circuit.

Further, the circuit also comprises a dummy load connected with the switch circuit; the switch circuit comprises a third end, the third end is connected with the dummy load, the first end is switched between the second end and the third end, and when the wireless charging receiving circuit is in the communication state, the first end is communicated with the third end, so that the dummy load is communicated with the rectifying circuit.

Further, the wireless charging system further comprises a controller connected with the switching circuit, wherein the controller is used for controlling the state of the switching circuit according to the state of the wireless charging receiving circuit.

Further, the wireless charging receiving circuit further comprises a voltage conversion circuit connected between the output end of the rectifying circuit and the battery, and the voltage conversion circuit is used for converting the direct-current voltage output by the rectifying circuit into the voltage required by the battery, and the voltage stabilizing capacitor and the switching circuit are connected between the output end of the rectifying circuit and the voltage conversion circuit; and/or

The wireless charging receiving circuit further comprises an impedance adjusting circuit, wherein the impedance adjusting circuit is connected between the resonant receiving circuit and the grounding end and is used for adjusting the equivalent impedance of the resonant receiving circuit.

Another aspect of the present utility model provides an electronic device, comprising:

a load;

a PCB board; a kind of electronic device with high-pressure air-conditioning system

The wireless charging receiving circuit according to any one of the above claims, wherein the battery is connected with the load to supply power to the load, and at least part of components of the wireless charging receiving circuit are arranged on the PCB, and the voltage stabilizing capacitor is arranged on the PCB.

Yet another aspect of the present utility model provides a wireless charging system, comprising:

the wireless charging reception circuit according to any one of the above;

the wireless charging transmitting circuit comprises a resonant transmitting circuit, and the resonant transmitting circuit is coupled with the resonant receiving circuit.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present utility model;

FIG. 2 is a system block diagram of an embodiment of a wireless charging system of the present utility model;

FIG. 3 is a system block diagram illustrating an embodiment of a wireless charging receiver circuit of the wireless charging system shown in FIG. 2;

FIG. 4 is a system block diagram of another embodiment of a wireless charging receive circuit of the wireless charging system of FIG. 2;

FIG. 5 is a system block diagram of an embodiment of the wireless charging receiving circuit shown in FIG. 4;

FIG. 6 is a system block diagram illustrating a further embodiment of a wireless charging receive circuit of the wireless charging system of FIG. 2;

fig. 7 is a system block diagram of an embodiment of the wireless charging receiving circuit shown in fig. 6.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "several" means at least two. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

The wireless charging receiving circuit comprises a battery, a resonance receiving circuit, a rectifying circuit, a grounding end, a voltage stabilizing capacitor and a switching circuit. The resonance receiving circuit is connected with the battery and is used for receiving electromagnetic signals of the wireless charging transmitting circuit and converting the electromagnetic signals into alternating voltage. The input end of the rectifying circuit is connected with the resonance receiving circuit, the output end of the rectifying circuit is connected with the battery, and the rectifying circuit is used for rectifying the alternating current voltage output by the resonance receiving circuit into direct current voltage. The voltage stabilizing capacitor is connected between the output end of the rectifying circuit and the grounding end. The switching circuit and the voltage stabilizing capacitor are connected in series between the output end of the rectifying circuit and the grounding end; when the wireless charging receiving circuit is in a communication state, the switching circuit is in a first state, and the switching circuit disconnects a loop from the output end of the rectifying circuit to the grounding end; when the wireless charging receiving circuit is in an electric energy transmission state, the switching circuit is in a second state, and the switching circuit is communicated with a loop from the output end of the rectifying circuit to the grounding end.

The wireless charging receiving circuit provided by the embodiment of the utility model comprises the switch circuit which is connected in series with the voltage stabilizing capacitor between the output end of the rectifying circuit and the grounding end, and the switch circuit is used for controlling the on-off of the voltage stabilizing capacitor and the rectifying circuit or the voltage stabilizing capacitor and the grounding end, so that capacitor howling caused by the change of electric fields at two ends of the voltage stabilizing capacitor when the wireless charging receiving circuit is in a communication state can be avoided or reduced to a certain extent, the possibility that a user hears board vibration noise is reduced, the user experience is improved, and the cost is lower.

The electronic equipment provided by the embodiment of the utility model comprises a load, a PCB and a wireless charging receiving circuit. The battery is connected with the load to supply power to the load, and at least part of components of the wireless charging receiving circuit are arranged on the PCB, wherein the voltage stabilizing capacitor is arranged on the PCB.

The wireless charging system comprises a wireless charging receiving circuit and a wireless charging transmitting circuit. The wireless charging transmitting circuit comprises a resonant transmitting circuit, and the resonant transmitting circuit is coupled with a resonant receiving circuit.

The wireless charging receiving circuit, the wireless charging system and the electronic device according to the present utility model will be described in detail with reference to the accompanying drawings. The features of the examples and embodiments described below may be combined with each other without conflict.

Fig. 1 is a schematic structural diagram of an embodiment of an electronic device 1 according to the present utility model. The electronic device 1 of the embodiment of the present utility model may be a terminal device having a wireless charging function, including but not limited to a handheld device, a wearable device, a computer device, and a vehicle-mounted device. The handheld device may include a mobile phone and a tablet computer. The electronic device 1 of the embodiment of the utility model comprises a load 30, a PCB board 40 and a wireless charging receiving circuit 10. In some embodiments, wireless charge receiving circuit 10 includes battery 100 and regulated capacitor C1. It will be appreciated that the type and number of the batteries 100 according to the embodiments of the present utility model are not limited, and the batteries 100 may include lithium batteries 100, and the batteries 100 may be one or two or more. In some embodiments, the battery 100 is removable, facilitating a user to quickly replace the underfumed battery 100. In other embodiments, the battery 100 is fixedly arranged in the electronic device 1, and the battery is directly charged without being detached and replaced. The battery 100 is connected to the load 30 to supply power to the load 30. The load 30 may include a screen, speaker, camera, or other electrical components of the electronic device 1. In some embodiments, at least some components of the wireless charging receiving circuit 10 are disposed on the PCB board 40. The voltage stabilizing capacitor C1 is disposed on the PCB 40, and the battery 100 may be independently disposed outside the PCB 40. In some embodiments, the stabilizing capacitor C1 is soldered to the PCB 40. In some embodiments, regulated capacitance C1 comprises a ceramic capacitance, which is relatively low cost. In other embodiments, the stabilizing capacitor C1 comprises a tantalum capacitor or other noise reduction capacitor, which may attenuate plate vibration noise to some extent. Alternatively, the number of the stabilizing capacitors C1 may be one, or may be two or more, which is not limited by the present utility model. The voltage stabilizing capacitor C1 can improve the effect of stabilizing voltage by increasing capacitance under the wireless charging application scene of low frequency large ripple.

Fig. 2 is a system block diagram of an embodiment of the wireless charging system 2 according to the present utility model. The wireless charging system 2 of the embodiment of the present utility model includes a wireless charging receiving circuit 10 and a wireless charging transmitting circuit 20. The wireless charging transmitting circuit 20 includes a resonant transmitting circuit 21, and the resonant transmitting circuit 21 is coupled with a resonant receiving circuit 200. In some embodiments, as shown in fig. 2, the resonant transmitting circuit 21 includes a transmitting coil L2 and a second capacitor C3 connected in series. In some embodiments, the wireless charging transmitting circuit 20 further includes a dc power source terminal Vin, a dc-to-ac conversion circuit 22, and a control circuit 23. Alternatively, the dc to ac conversion circuit 22 may include a full power bridge, or an inverter. The control circuit 23 may include an MCU (Micro Controller Unit, micro control unit) or may include a transmitting end chip. Specifically, the dc power source terminal Vin is connected to the dc-ac conversion circuit 22, the dc-ac conversion circuit 22 is connected to the resonant transmitting circuit 21, and the control circuit 23 is connected to the dc-ac conversion circuit 22 to perform protocol identification in the communication state of the wireless charging transmitting circuit 20. The dc-ac conversion circuit 22 converts the dc voltage of the dc power source terminal Vin into an ac voltage, and generates an electromagnetic signal through the resonant transmitting circuit 21, and the resonant receiving circuit 200 receives the electromagnetic signal to achieve the purpose of charging the battery 100. In some embodiments, the wireless charging transmitting circuit 20 is disposed inside the wireless charging transmitting device, and when the electronic device 1 of the above embodiment approaches or clings to the wireless charging transmitting device, the electronic device 1 can realize wireless charging. In some embodiments, the transmitting coil L2 may be close to the charging contact surface of the wireless charging transmitting device to improve the efficiency of wireless charging.

In the related art, when an electronic device or a wireless charging receiving circuit is in a communication state, namely, in a charging protocol identification stage, a variable electric field is applied to two ends of a voltage stabilizing capacitor, and the voltage stabilizing capacitor is deformed to generate mechanical vibration, so that a PCB (printed circuit board) vibrates along with the mechanical vibration to cause board vibration noise. The wireless charging receiving circuit 10 of the embodiment of the present utility model includes a battery 100, a resonance receiving circuit 200, a rectifying circuit 300, a ground terminal GND, a voltage stabilizing capacitor C1, and a switching circuit 400. The resonant receiving circuit 200 is connected to the battery 100, and the resonant receiving circuit 200 is configured to receive an electromagnetic signal of the wireless charging transmitting circuit 20 and convert the electromagnetic signal into an ac voltage. An input terminal of the rectifying circuit 300 is connected to the resonance receiving circuit 200, an output terminal of the rectifying circuit 300 is connected to the battery 100, and the rectifying circuit 300 is configured to rectify the ac voltage output from the resonance receiving circuit 200 into the dc voltage. The stabilizing capacitor C1 is connected between the output terminal of the rectifying circuit 300 and the ground GND. The switching circuit 400 and the stabilizing capacitor C1 are connected in series between the output terminal of the rectifying circuit 300 and the ground GND. When the wireless charging receiving circuit 10 is in the communication state, the switch circuit 400 is in the first state, and the switch circuit 400 disconnects the loop from the output end of the rectifying circuit 300 to the ground end GND; when the wireless charging receiving circuit 10 is in the power transmission state, the switch circuit 400 is in the second state, and the switch circuit 400 is connected to the circuit from the output end of the rectifying circuit 300 to the ground end GND. The wireless charging receiving circuit 10 of the embodiment of the utility model includes the switch circuit 400 connected in series with the voltage stabilizing capacitor C1 between the output end of the rectifying circuit 300 and the ground end GND, and the switch circuit 400 controls the on-off of the voltage stabilizing capacitor C1 and the rectifying circuit 300 or the voltage stabilizing capacitor C1 and the ground end GND, so that the capacitor howling caused by the electric field change at two ends of the voltage stabilizing capacitor C1 when the wireless charging receiving circuit 10 is in a communication state can be avoided or reduced to a certain extent, thereby reducing the possibility that a user hears the board vibration noise, improving the user experience and having lower cost.

When the electronic device 1 or the wireless charging receiving circuit 10 having the wireless charging function is close to or attached to the wireless charging transmitting device, the wireless charging transmitting circuit 20 and the wireless charging receiving circuit 10 include a communication state and a power transmission state. When the wireless charging transmitting circuit 20 and the wireless charging receiving circuit 10 are in a communication state, charging protocol identification is required, and at the moment, capacitance howling is easy to hear by the human ear; after the handshake is completed, the wireless charging transmitting circuit 20 and the wireless charging receiving circuit 10 enter a power transmission state to complete the purpose of charging the battery 100. In some embodiments, the resonant receiving circuit 200 includes a receiving coil L1 and a first capacitor C2 connected in series. The receiving coil L1 may receive the electromagnetic signal output from the transmitting coil L2. In some embodiments, the switching circuit 400 includes a first end 410 and a second end 420, and the switching circuit 400 is in a first state when the first end 410 and the second end 420 are open. When the first terminal 410 and the second terminal 420 are conductive, the switch circuit 400 is in the second state. Alternatively, the switching circuit 400 may include an electronically controlled switch, such as a single pole double throw switch, relay, contactor, triode.

In the related art, the ceramic capacitor has a piezoelectric effect, so that the ceramic capacitor can be replaced by a tantalum capacitor or other noise reduction capacitors, however, the tantalum capacitor has higher price and serious heating; if the number of the voltage stabilizing capacitors is large, the cost of the wireless charging receiving circuit is high. The wireless charging receiving circuit 10 of the embodiment of the utility model adopts the switch circuit 400 to control the on-off of the voltage stabilizing capacitor C1 and the rectifying circuit 300 or the voltage stabilizing capacitor C1 and the ground end GND, so that the circuit structure is simple, the production is convenient, and the cost is lower compared with the scheme for replacing the voltage stabilizing capacitor C1.

Fig. 3 is a system block diagram of an embodiment of the wireless charging receiving circuit 10 of the wireless charging system 2 shown in fig. 2. In some embodiments, the wireless charging receiving circuit 10 includes a controller 600 connected to the switching circuit 400, and the controller 600 may control the state of the switching circuit 400 according to the state of the wireless charging receiving circuit 10. When the wireless charging receiving circuit 10 is in the communication state, the controller 600 controls the switch circuit 400 to be in the first state; when the wireless charge receiving circuit 10 is in the power transmission state, the controller 600 controls the switching circuit 400 to be in the second state. It will be appreciated that the controller 600 may implement the identification function when the wireless charging receiving circuit 10 is in a communication state. The identification function may include a charging protocol identification, a charging device identification, and a foreign object detection identification. Optionally, the controller 600 may include a receiving end chip, and may also include an MCU (Micro Controller Unit, micro control unit). In some embodiments, the rectifying circuit 300 may be integrated within the controller 600. In some embodiments, the switching circuit 400 may be integrated within the controller 600.

In some embodiments, the wireless charging receiving circuit 10 includes a voltage conversion circuit 700 connected between the output terminal of the rectifying circuit 300 and the battery 100, for converting the dc voltage output by the rectifying circuit 300 into the voltage required by the battery 100, and the voltage stabilizing capacitor C1 and the switching circuit 400 are connected between the output terminal of the rectifying circuit 300 and the voltage conversion circuit 700. In some embodiments, the voltage conversion circuit 700 may include a charging IC. In some embodiments, the voltage conversion circuit 700 may include an LDO (Low Drop Output, low dropout linear regulator). In other embodiments, the voltage conversion circuit 700 may include a DC/DC converter. The DC/DC converter may include a buck-type DC/DC converter.

In some embodiments, the wireless charging receiving circuit 10 includes an impedance adjusting circuit 800, the impedance adjusting circuit 800 is connected between the resonant receiving circuit 200 and the ground GND, and the impedance adjusting circuit 800 is used to adjust the equivalent impedance of the resonant receiving circuit 200. It will be appreciated that the different equivalent impedances at the receiving end will affect the voltage and current of the resonant unit at the transmitting end, and the impedance adjusting circuit 800 can adjust the equivalent impedance of the resonant receiving circuit 200 by switching the capacitance to ground.

Referring to fig. 2, in the present embodiment, the switch circuit 400 is connected between the voltage stabilizing capacitor C1 and the ground GND. When the wireless charging receiving circuit 10 is in the communication state, the switch circuit 400 is in the first state, the voltage stabilizing capacitor C1 is disconnected from the ground GND, and the voltage stabilizing capacitor C1 cannot be charged or discharged, so that the capacitor howling can be avoided or reduced. When the wireless charging receiving circuit 10 is in the power transmission state, the switch circuit 400 is in the second state, the voltage stabilizing capacitor C1 is connected to the ground GND, and the voltage stabilizing capacitor C1 can normally perform voltage stabilization. It will be appreciated that in this embodiment, the first state of the switching circuit 400 may include the switching circuit 400 being off, and the second state of the switching circuit 400 may include the switching circuit 400 being on.

Referring to fig. 3, the wireless charging receiving circuit 10 may further include a controller 600 connected to the switching circuit 400, a voltage conversion circuit 700 connected between the output terminal of the rectifying circuit 300 and the battery 100, and an impedance adjustment circuit 800 connected between the resonant receiving circuit 200 and the ground terminal GND, which are not described herein.

In some embodiments, the switching circuit 400 is connected between the voltage stabilizing capacitor C1 and the rectifying circuit 300. When the wireless charging receiving circuit 10 is in the communication state, the switch circuit 400 is in the first state, the voltage stabilizing capacitor C1 is disconnected from the rectifying circuit 300, and the voltage stabilizing capacitor C1 cannot be charged or discharged, so that the capacitor howling can be avoided or reduced. When the wireless charging receiving circuit 10 is in the power transmission state, the switch circuit 400 is in the second state, the voltage stabilizing capacitor C1 is connected to the rectifying circuit 300, and the voltage stabilizing capacitor C1 can normally perform voltage stabilization.

Fig. 4 is a system block diagram of another embodiment of the wireless charging receiving circuit 10 of the wireless charging system 2 shown in fig. 2. Based on the above embodiment, the first terminal 410 of the switching circuit 400 is connected between the output terminal of the rectifying circuit 300 and the battery 100, and the second terminal 420 of the switching circuit 400 is connected to the stabilizing capacitor C1. One end of a switch of the switching circuit 400 is connected between the output terminal of the rectifying circuit 300 and the battery 100, and the other end is connected to the stabilizing capacitor C1. It will be appreciated that in this embodiment, the first state of the switching circuit 400 may include the switching circuit 400 being off, and the second state of the switching circuit 400 may include the switching circuit 400 being on.

Fig. 5 is a system block diagram of an embodiment of the wireless charging receiving circuit 10 shown in fig. 4. Based on the above embodiment, as shown in fig. 5, the wireless charging receiving circuit 10 may further include a controller 600 connected to the switching circuit 400, a voltage conversion circuit 700 connected between the output terminal of the rectifying circuit 300 and the battery 100, and an impedance adjustment circuit 800 connected between the resonant receiving circuit 200 and the ground terminal GND, which are not described again.

Fig. 6 is a system block diagram of a further embodiment of the wireless charging receiving circuit 10 of the wireless charging system 2 shown in fig. 2. In the present embodiment, a first end 410 of the switching circuit 400 is connected to the output terminal of the rectifying circuit 300, a second end 420 of the switching circuit 400 is connected to the stabilizing capacitor C1, and the second end 420 is connected to the battery 100. One end of a switch of the switching circuit 400 is connected to an output terminal of the rectifying circuit 300, and the other end is connected to the stabilizing capacitor C1 and to the battery 100. When the wireless charging receiving circuit 10 is in the communication state, the switch circuit 400 is in the first state, the battery 100 is disconnected from the rectifying circuit 300, and the voltage stabilizing capacitor C1 is disconnected from the rectifying circuit 300, so that the voltage stabilizing capacitor C1 cannot be charged or discharged, and the capacitor howling can be avoided or reduced. When the wireless charging receiving circuit 10 is in the power transmission state, the switch circuit 400 is in the second state, the battery 100 is connected with the rectifying circuit 300, and the voltage stabilizing capacitor C1 is connected with the rectifying circuit 300, so that the voltage stabilizing capacitor C1 can normally stabilize voltage.

Fig. 7 is a system block diagram of an embodiment of the wireless charging receiving circuit 10 shown in fig. 6. Based on the above embodiment, as shown in fig. 7, the wireless charging receiving circuit 10 may further include a controller 600 connected to the switching circuit 400, a voltage conversion circuit 700 connected between the output terminal of the rectifying circuit 300 and the battery 100, and an impedance adjustment circuit 800 connected between the resonant receiving circuit 200 and the ground terminal GND, which are not described again.

With continued reference to fig. 7, the wireless charging receiving circuit 10 includes a dummy load 500 connected to the switching circuit 400 on the basis of the above-described embodiment. In some embodiments, as shown in fig. 7, the switching circuit 400 includes a third terminal 430, and the first terminal 410 of the switching circuit 400 may be switched between the second terminal 420 and the third terminal 430. Specifically, the third terminal 430 is connected to the dummy load 500, and when the wireless charging receiving circuit 10 is in a communication state, the first terminal 410 is connected to the third terminal 430, so that the dummy load 500 is connected to the rectifying circuit 300. Alternatively, the dummy load 500 may include a resistive load, a capacitive load, or an inductive load, and the type and parameters of the dummy load 500 may be determined according to the specific load of the subsequent stage of the rectifying circuit 300, which is not limited by the present utility model. When the wireless charging receiving circuit 10 is in the communication state, the switch circuit 400 is in the first state, the rectifying circuit 300 is connected to the dummy load 500, and the rectifying circuit 300 is disconnected from the voltage converting circuit 700 and the loads such as the battery 100. At this time, the dummy load 500 may replace the load such as the voltage conversion circuit 700 and the battery 100 at the subsequent stage in the communication state of the wireless charging receiving circuit 10, so as to successfully complete the charging protocol identification. When the wireless charging receiving circuit 10 is in the power transmission state, the switching circuit 400 is in the second state, the rectifying circuit 300 is disconnected from the dummy load 500, and the rectifying circuit 300 is connected to the voltage converting circuit 700 and the load such as the battery 100 of the subsequent stage to realize the power transmission. In some embodiments, the switching circuit 400 includes a single pole double throw switch. When the wireless charging receiving circuit 10 is in a communication state, the single-pole double-throw switch is switched to connect the dummy load 500 with the rectifying circuit 300, and to disconnect the rectifying circuit 300 from the load such as the voltage converting circuit 700 and the battery 100 at the subsequent stage; when the wireless charging receiving circuit 10 is in the power transmission state, the single pole double throw switch switches off the dummy load 500 and the rectifying circuit 300, and connects the rectifying circuit 300 and the load such as the voltage converting circuit 700 and the battery 100 at the subsequent stage. In other embodiments, the switching circuit 400 includes a first switch and a second switch in parallel. The first switch includes a first end 410 and a second end 420, and the second switch includes a first end 410 and a third end 430. The first switch is connected between the output terminal of the rectifying circuit 300 and the battery 100, and the second switch is connected between the output terminal of the rectifying circuit 300 and the dummy load 500. When the first switch is turned off and the second switch is turned on, the switching circuit 400 is in the first state, and the rectifying circuit 300 is connected to the voltage converting circuit 700 of the subsequent stage and the load such as the battery 100; when the first switch is closed and the second switch is opened, the switching circuit 400 is in the second state, and the dummy load 500 is in communication with the rectifying circuit 300. In some embodiments, the first switch and the second switch are interlocked so as to prevent the first switch and the second switch from being simultaneously opened or simultaneously closed. In some embodiments, the controller 600 controls the states of the first switch and the second switch.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.

Claims (10)

1. A wireless charging receiving circuit, comprising:

a battery;

the resonance receiving circuit is connected with the battery and is used for receiving electromagnetic signals of the wireless charging transmitting circuit and converting the electromagnetic signals into alternating voltage;

the input end of the rectifying circuit is connected with the resonance receiving circuit, the output end of the rectifying circuit is connected with the battery, and the rectifying circuit is used for rectifying the alternating voltage output by the resonance receiving circuit into direct voltage;

a grounding end;

the voltage stabilizing capacitor is connected between the output end of the rectifying circuit and the grounding end;

the switching circuit is connected in series with the voltage stabilizing capacitor and is arranged between the output end of the rectifying circuit and the grounding end; when the wireless charging receiving circuit is in a communication state, the switching circuit is in a first state, and the switching circuit disconnects a loop from the output end of the rectifying circuit to the grounding end; when the wireless charging receiving circuit is in an electric energy transmission state, the switching circuit is in a second state, and the switching circuit is communicated with a loop from the output end of the rectifying circuit to the grounding end.

2. The wireless charging receiving circuit of claim 1, wherein the switching circuit is connected between the regulated capacitor and the ground terminal; when the switch circuit is in the first state, the voltage stabilizing capacitor is disconnected from the grounding end; when the switch circuit is in the second state, the voltage stabilizing capacitor is communicated with the grounding end.

3. The wireless charging receiving circuit of claim 1, wherein the switching circuit is connected between the regulated capacitor and the rectifying circuit; when the switching circuit is in the first state, the voltage stabilizing capacitor is disconnected from the rectifying circuit; when the switch circuit is in the second state, the voltage stabilizing capacitor is communicated with the rectifying circuit.

4. The wireless charging receiving circuit of claim 3, wherein the switching circuit comprises a first end and a second end, the switching circuit being in the first state when the first end and the second end are disconnected; when the first end and the second end are communicated, the switch circuit is in the second state; the first end is connected between the output end of the rectifying circuit and the battery, and the second end is connected with the voltage stabilizing capacitor.

5. The wireless charging receiving circuit of claim 3, wherein the switching circuit comprises a first end and a second end, the switching circuit being in the first state when the first end and the second end are disconnected; when the first end and the second end are communicated, the switch circuit is in the second state; the first end is connected with the output end of the rectifying circuit, the second end is connected with the voltage stabilizing capacitor, and the second end is connected with the battery; when the switch circuit is in the first state, the battery is disconnected from the rectifying circuit; when the switch circuit is in the second state, the battery is connected with the rectifying circuit.

6. The wireless charging receive circuit of claim 5, further comprising a dummy load connected to the switching circuit; the switch circuit comprises a third end, the third end is connected with the dummy load, the first end is switched between the second end and the third end, and when the wireless charging receiving circuit is in the communication state, the first end is communicated with the third end, so that the dummy load is communicated with the rectifying circuit.

7. The wireless charging receiving circuit of claim 1, further comprising a controller coupled to the switching circuit, the controller configured to control a state of the switching circuit based on a state of the wireless charging receiving circuit.

8. The wireless charging receiving circuit according to claim 1, further comprising a voltage conversion circuit connected between an output terminal of the rectifying circuit and the battery for converting the dc voltage output from the rectifying circuit into a voltage required by the battery, the voltage stabilizing capacitor and the switching circuit being connected between the output terminal of the rectifying circuit and the voltage conversion circuit; and/or

The wireless charging receiving circuit further comprises an impedance adjusting circuit, wherein the impedance adjusting circuit is connected between the resonant receiving circuit and the grounding end and is used for adjusting the equivalent impedance of the resonant receiving circuit.

9. An electronic device, comprising:

a load;

a PCB board; a kind of electronic device with high-pressure air-conditioning system

The wireless charging receiving circuit according to any one of claims 1-8, wherein the battery is connected with the load to supply power to the load, and at least part of components of the wireless charging receiving circuit are arranged on the PCB, and the voltage stabilizing capacitor is arranged on the PCB.

10. A wireless charging system, comprising:

the wireless charging receiving circuit of any one of claims 1-8;

the wireless charging transmitting circuit comprises a resonant transmitting circuit, and the resonant transmitting circuit is coupled with the resonant receiving circuit.