CN113224823A

CN113224823A - Bidirectional wireless charging transceiver circuit and electronic equipment

Info

Publication number: CN113224823A
Application number: CN202110644283.3A
Authority: CN
Inventors: 毛方玉; 路延; 马许愿
Original assignee: University of Macau
Current assignee: University of Macau
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-08-06

Abstract

The application provides a bidirectional wireless charging transceiver circuit and electronic equipment, wherein the bidirectional wireless charging transceiver circuit comprises a controller, a resonant cavity and a rectifying unit; the controller is used for determining the current mode according to the mode signal. The user can select the current mode of the bidirectional wireless charging transceiver circuit through the mode signal, the current mode can be a receiving mode or a transmitting mode, namely, the bidirectional wireless charging transceiver circuit can be used as a transmitting end or a receiving end and can be multiplexed. Under the condition that the current mode is a receiving mode, the resonant cavity is used for receiving energy transmitted by transmitting equipment and generating resonant current; the controller is further used for sending a driving signal to the rectifying unit when the direction of the resonant current is a preset direction so as to drive the rectifying unit to rectify and regulate the resonant current, and the battery is charged through the rectified and regulated resonant current. The problem that when the resonant cavity does not receive energy, the rectifying unit is started, and the battery can be discharged is avoided.

Description

Bidirectional wireless charging transceiver circuit and electronic equipment

Technical Field

The application relates to the field of charging, in particular to a bidirectional wireless charging transceiver circuit and an electronic device.

Background

With the development and scientific progress of society, the living standard of people is remarkably improved, and more electronic devices are widely applied to the lives of people. The electronic device is, for example, a mobile phone, a tablet, a smart watch, a wireless headset, or the like. The electronic equipment is characterized by consuming electric energy to provide corresponding functions or services so as to meet the requirements of people. When the electric energy is consumed, the electronic device needs to be charged.

The prior art adopts wired charging technology more, and wired charging technology receives restrictions such as charging wire, charging socket and charging head, and it is inconvenient to use. How to develop a charging technology capable of flexibly transmitting electric energy becomes a difficult problem to be solved urgently by technical personnel in the field.

Disclosure of Invention

An object of the present application is to provide a bidirectional wireless charging transceiver circuit and an electronic device, so as to at least partially improve the above problems.

In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:

in a first aspect, an embodiment of the present application provides a bidirectional wireless charging transceiver circuit, where the bidirectional wireless charging transceiver circuit includes a controller, a resonant cavity, and a rectifying unit;

the first end of the resonant cavity is connected with the first end of the rectifying unit, the second end of the resonant cavity is connected with the second end of the rectifying unit, the third end and the fourth end of the rectifying unit are respectively connected with the anode and the cathode of the battery, and the controller is connected with the rectifying unit;

the controller is used for determining a current mode according to a mode signal, wherein the current mode comprises a transmitting mode and a receiving mode, and the mode signal comprises a transmitting starting signal corresponding to the transmitting mode and a receiving starting signal corresponding to the receiving mode;

under the condition that the current mode is the emission mode, the controller is used for sending a driving signal to the rectifying unit so as to drive the rectifying unit to rectify and regulate the discharge current released by the battery, and the rectified and regulated discharge current is input into the resonant cavity;

the resonant cavity is used for transmitting energy to corresponding receiving equipment after discharge current flows in;

under the condition that the current mode is a receiving mode, the resonant cavity is used for receiving energy transmitted by transmitting equipment and generating resonant current;

the controller is further configured to send a driving signal to the rectifying unit when the direction of the resonant current is a preset direction, so as to drive the rectifying unit to rectify and regulate the resonant current, and charge the battery through the rectified and regulated resonant current.

Optionally, the rectifying unit includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, an inductor, and a first capacitor;

a first pole of the first switching tube and a first pole of the second switching tube are connected to a point to serve as a first end of the rectifying unit, and a first pole of the third switching tube and a first pole of the fourth switching tube are connected to a point to serve as a second end of the rectifying unit;

the second pole of the first switch tube and the second pole of the fourth switch tube are both connected to the ground;

a second pole of the second switching tube and a second pole of the third switching tube are connected to a point, a pole of the first capacitor is connected between the second pole of the second switching tube and the second pole of the third switching tube, and one end of the inductor is connected to a second end of the rectifying unit;

the other end of the inductor is used as a third end of the rectifying unit, and a fourth end of the rectifying unit is a grounding end;

the other pole of the first capacitor is connected to the third end of the rectifying unit or the ground;

a third pole of the first switching tube, a third pole of the second switching tube, a third pole of the third switching tube and a third pole of the fourth switching tube are all connected with the controller;

the controller is configured to send a driving signal to the third pole of the first switch tube, the third pole of the second switch tube, the third pole of the third switch tube, and the third pole of the fourth switch tube according to a current working condition, so as to switch a working phase of the rectifying unit, where the current working condition is any one of receiving working conditions corresponding to the receiving mode.

Optionally, the bidirectional wireless charging transceiver circuit further includes a first comparator, a second comparator and a selector, an inverting input terminal of the first comparator is connected to the first end of the resonant cavity, a non-inverting input terminal of the first comparator is grounded, an output terminal of the first comparator is connected to the first input terminal of the selector, an output terminal of the selector is connected to the controller, a non-inverting input terminal of the second comparator is connected to the second end of the resonant cavity, a non-inverting input terminal of the second comparator is grounded, and an output terminal of the second comparator is connected to the controller;

the second comparator is configured to acquire a second level signal of a second end of the resonant cavity, where a second output signal is 0 when the second level signal is greater than 0, and the second output signal is a high level when the second level signal is less than 0, where the second output signal is an output signal of the second comparator;

the first comparator is used for acquiring a first level signal of a first end of the resonant cavity, when the first level signal is greater than 0, a first output signal is 0, and when the first level signal is less than 0, the first output signal is at a high level, wherein the first output signal is an output signal of the first comparator;

the selector is used for forwarding the first output signal to the controller under the condition that the mode signal is a receiving starting signal;

the controller is used for switching the current working condition according to the first output signal, the second output signal and the resonant current.

Optionally, the receiving conditions include a first receiving condition, a second receiving condition, and a third receiving condition;

the first receiving working condition is that the controller outputs high-level signals to a third pole of the second switching tube and a third pole of the fourth switching tube so as to enable the second switching tube and the fourth switching tube to be conducted, and outputs low-level signals to the third pole of the first switching tube and the third pole of the third switching tube so as to enable the first switching tube and the third switching tube to be disconnected;

the second receiving condition is that the controller outputs a low level signal to a third pole of the second switching tube and a third pole of the fourth switching tube so as to disconnect the second switching tube and the fourth switching tube, and outputs a high level signal to the third pole of the first switching tube and the third pole of the third switching tube so as to connect the first switching tube and the third switching tube;

the third receiving working condition comprises a first interval, a second interval and a third interval;

the first interval is that the controller outputs a high-level signal to a third pole of the fourth switching tube to turn on the fourth switching tube, and outputs a low-level signal to the third pole of the first switching tube, the third pole of the second switching tube and the third pole of the third switching tube to turn off the first switching tube, the second switching tube and the third switching tube;

the second interval is that the controller outputs a high-level signal to a third pole of the first switch tube and a third pole of the fourth switch tube to enable the first switch tube and the fourth switch tube to be conducted, and outputs a low-level signal to the third pole of the second switch tube and the third pole of the third switch tube to enable the second switch tube and the third switch tube to be disconnected;

the third section is configured such that the controller outputs a high level signal to a third pole of the first switching tube to turn on the first switching tube, and outputs a low level signal to a third pole of the second switching tube, a third pole of the third switching tube, and a third pole of the fourth switching tube to turn off the second switching tube, the third switching tube, and the fourth switching tube;

under the condition that the current working condition is the first receiving working condition, when the resonant current is changed from a negative direction to a positive direction, the controller is used for switching the first interval to a new current working condition; when the first output signal changes from 0 to high level, the controller is used for switching the second interval to a new current working condition; and when the high level of the second output signal is changed into 0, the controller is used for switching the third interval to a new current working condition, and after the first pole level of the third switching tube is higher than the second pole level of the third switching tube, the controller is used for switching the second receiving working condition to the new current working condition.

Optionally, the receiving conditions further include a fourth receiving condition;

the fourth receiving condition is that the controller outputs a high level signal to a third pole of the first switch tube and a third pole of the fourth switch tube to enable the first switch tube and the fourth switch tube to be conducted, and outputs a low level signal to a third pole of the second switch tube and a third pole of the third switch tube to enable the second switch tube and the third switch tube to be disconnected;

under the condition that the current working condition is the second receiving working condition, when the resonant current is changed from the positive direction to the negative direction, the controller is used for switching the fourth receiving working condition to a new current working condition; and after a preset time interval, the controller is used for switching the first receiving working condition to a new current working condition, wherein the preset time interval is integral multiple of the resonant current conversion period.

Optionally, the output end of the first comparator is further connected to the controller, and the selector is configured to forward the received clock signal to the controller when the mode signal is a transmission start signal;

the controller is used for switching the current working condition according to the first output signal, the second output signal and the discharging current after receiving the clock signal.

Optionally, the rectifying unit further includes a second capacitor, and two poles of the second capacitor are respectively connected to the third terminal and the fourth terminal of the rectifying unit.

Optionally, the resonant cavity includes a resonant coil and a resonant capacitor, one end of the resonant coil is connected to one pole of the resonant capacitor, and the other end of the resonant coil and the other pole of the resonant capacitor are respectively used as the first end and the second end of the resonant cavity.

In a second aspect, an embodiment of the present application provides an electronic device, which includes the above bidirectional wireless charging transceiver circuit.

Compared with the prior art, the bidirectional wireless charging transceiver circuit and the electronic device provided by the embodiment of the application comprise a controller, a resonant cavity and a rectifying unit; the controller is used for determining the current mode according to the mode signal. The user can select the current mode of the bidirectional wireless charging transceiver circuit through the mode signal, the current mode can be a receiving mode or a transmitting mode, namely, the bidirectional wireless charging transceiver circuit can be used as a transmitting end or a receiving end and can be multiplexed. Under the condition that the current mode is the emission mode, the controller is used for sending a driving signal to the rectifying unit so as to drive the rectifying unit to rectify and regulate the discharging current released by the battery, and inputting the rectified and regulated discharging current into the resonant cavity; the resonant cavity is used for transmitting energy to corresponding receiving equipment after the discharge current flows in; under the condition that the current mode is a receiving mode, the resonant cavity is used for receiving energy transmitted by transmitting equipment and generating resonant current; the controller is further used for sending a driving signal to the rectifying unit when the direction of the resonant current is a preset direction so as to drive the rectifying unit to rectify and regulate the resonant current, and the battery is charged through the rectified and regulated resonant current. When the direction of the resonant current is a preset direction, the resonant cavity receives energy, a driving signal can be sent to the rectifying unit to drive the rectifying unit to rectify and regulate the resonant current, and the battery is charged through the rectified and regulated resonant current. The problem that when the resonant cavity does not receive energy, the rectifying unit is started, and the battery can be discharged is avoided.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.

Fig. 1a is a schematic connection diagram of a wireless fast charging receiving scheme according to an embodiment of the present application;

fig. 1b is a schematic structural diagram of an improved receiving end according to an embodiment of the present application;

fig. 2 is a schematic connection diagram of a bidirectional wireless charging transceiver circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic connection diagram of a bidirectional wireless charging transceiver circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic connection diagram of a first receiving condition provided in the embodiment of the present application;

fig. 5 is a schematic connection diagram of a second receiving condition provided in the embodiment of the present application;

fig. 6 is a schematic connection diagram of a third receiving condition provided in the embodiment of the present application;

FIG. 7 is a schematic diagram illustrating current level variation in a receiving mode according to an embodiment of the present disclosure;

fig. 8 is a connection diagram of a first transmission condition provided in an embodiment of the present application;

FIG. 9 is a schematic connection diagram for a second transmit condition provided by an embodiment of the present application;

FIG. 10 is a schematic connection diagram for a third transmit operating mode provided by an embodiment of the present application;

fig. 11 is a schematic diagram of a current level variation in a transmitting mode according to an embodiment of the present application.

In the figure: 10-a bidirectional wireless charging transceiver circuit; 101-a controller; 102-a rectifying unit; 103-resonant cavity.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

With the development of wireless charging technology, in order to further improve the flexibility of power transmission, bidirectional wireless charging technology is proposed and developed. By multiplexing large-volume power devices at the transmitting end and the receiving end, the bidirectional wireless charging technology can realize wireless charging of equipment by the equipment with convenience and low cost. In wireless fast-charging applications, in order to reduce the power loss of the parasitic resistance of the power device and the interconnection wiring thereof, the transmitting and receiving resonant coil needs to be driven by a high-voltage alternating voltage to reduce the transmitting and receiving current. Fig. 1a shows a wireless fast charging reception scheme. A high efficiency switched capacitor DC-DC converter is used to provide 2: a pressure reduction ratio of 1. However, the switched capacitor circuit cannot achieve accurate voltage control. In order to accurately control the output voltage of the rectifier, a receiving terminal structure as shown in fig. 1b is proposed. In this structure, the reception resonant coil is multiplexed as a power inductor. By setting the conversion ratio of the switched capacitor converter to 1: 1 and 2: 1, voltage control can be realized. However, this scheme introduces charge sharing losses between capacitors, reducing charging efficiency. In addition to this, an additional charger is introduced into the structure in order to provide a continuous charging current, resulting in further reduction of charging efficiency and increased cost.

In order to overcome the above problem, an embodiment of the present application provides a bidirectional wireless charging transceiver circuit. Referring to fig. 2, fig. 2 is a schematic connection diagram of a bidirectional wireless charging transceiver circuit according to an embodiment of the present disclosure. As shown in fig. 2, the bidirectional wireless charging transceiver circuit 10 includes a controller 101, a resonant cavity 103, and a rectifying unit 102.

The first end of the resonant cavity 103 is connected with the first end of the rectifying unit 102, the second end of the resonant cavity 103 is connected with the second end of the rectifying unit 102, the third end and the fourth end of the rectifying unit 102 are respectively connected with the anode and the cathode of the battery, and the controller 101 is connected with the rectifying unit 102.

The controller 101 is configured to determine a current Mode according to a Mode signal, where the current Mode includes a transmitting Mode and a receiving Mode, the Mode signal includes a transmitting start signal corresponding to the transmitting Mode and a receiving start signal corresponding to the receiving Mode, and the Mode signal is, for example, the Mode signal in fig. 3.

In the case that the current mode is the transmission mode, the controller 101 is configured to send a driving signal to the rectifying unit 102 to drive the rectifying unit to rectify and regulate the discharge current discharged by the battery, and input the rectified and regulated discharge current into the resonant cavity 103.

Specifically, when the current mode of the bidirectional wireless charging transceiving circuit 10 is the transmission mode, the circuit connection diagram thereof is shown on the left side of fig. 2. The rectifying unit 102 starts to work when receiving the driving signal, keeps conducting with the battery, the battery sends out discharging current, and the discharging current enters the resonant cavity 103 after the direct current to alternating current conversion and the voltage regulation are carried out through the rectifying unit 102.

The resonant cavity 103 is used for transmitting energy to a corresponding receiving device after the discharge current flows in.

Alternatively, the resonant cavity 103 may generate a magnetic field due to the characteristics of electromagnetic induction after the discharge current flows, so as to transmit energy to the corresponding receiving device.

In the case where the current mode is a receiving mode, the resonant cavity 103 is used to receive energy emitted by the emitting device and generate a resonant current. Specifically, when the current mode of the bidirectional wireless charging transceiver circuit 10 is the receiving mode, the circuit connection diagram is shown on the right side of fig. 2.

The controller 101 is further configured to send a driving signal to the rectifying unit 102 when the direction of the resonant current is a preset direction, so as to drive the rectifying unit 102 to rectify and regulate the resonant current, and charge the battery through the rectified and regulated resonant current.

Alternatively, the preset direction is that the resonance current flows from the first end to the second end of the resonant cavity 103 (positive direction) or that the resonance current flows from the second end to the first end of the resonant cavity 103 (negative direction), and may be set according to a specific connection relationship.

When the direction of the resonant current is a preset direction (for example, a positive direction), which indicates that the resonant cavity 103 is receiving energy, a driving signal may be sent to the rectifying unit 102 to drive the rectifying unit 102 to rectify and regulate the resonant current, and the battery is charged by rectifying and regulating the resonant current. It is avoided that when the resonant cavity 103 does not receive energy, the rectifying unit 102 is turned on, and the battery is discharged.

In a possible implementation manner, a user may select a current mode of the bidirectional wireless charging transceiver circuit through the mode signal, where the current mode may be a receiving mode or a transmitting mode, that is, the bidirectional wireless charging transceiver circuit may be used as a transmitting end or a receiving end, and may be multiplexed.

In summary, the embodiment of the present application provides a bidirectional wireless charging transceiver circuit, which includes a controller, a resonant cavity, and a rectifying unit; the controller is used for determining the current mode according to the mode signal. The user can select the current mode of the bidirectional wireless charging transceiver circuit through the mode signal, the current mode can be a receiving mode or a transmitting mode, namely, the bidirectional wireless charging transceiver circuit can be used as a transmitting end or a receiving end and can be multiplexed. Under the condition that the current mode is the emission mode, the controller is used for sending a driving signal to the rectifying unit so as to drive the rectifying unit to rectify and regulate the discharging current released by the battery, and inputting the rectified and regulated discharging current into the resonant cavity; the resonant cavity is used for transmitting energy to corresponding receiving equipment after the discharge current flows in; under the condition that the current mode is a receiving mode, the resonant cavity is used for receiving energy transmitted by transmitting equipment and generating resonant current; the controller is further used for sending a driving signal to the rectifying unit when the direction of the resonant current is a preset direction so as to drive the rectifying unit to rectify and regulate the resonant current, and the battery is charged through the rectified and regulated resonant current. When the direction of the resonant current is a preset direction, the resonant cavity receives energy, a driving signal can be sent to the rectifying unit to drive the rectifying unit to rectify and regulate the resonant current, and the battery is charged through the rectified and regulated resonant current. The problem that when the resonant cavity does not receive energy, the rectifying unit is started, and the battery can be discharged is avoided.

As for the structure of the rectifying unit 102, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 3, in which the rectifying unit 102 includes a first switching tube S₁A second switch tube S₂A third switch tube S₃And a fourth switching tube S₄Inductor L₁And a first capacitor C_FLY。

First switch tube S₁First pole and second switch tube S₂Is connected to a point as a first end of the rectifying unit 102, and a third switching tube S₃First pole and fourth switching tube S₄Is connected to a point as a second terminal of the rectifying unit 102.

First switch tube S₁Second and fourth switching tubes S₄Are all connected to ground.

A second switch tube S₂Second pole and third switching tube S₃Is connected to a point, a first capacitor C_FLYToPole connected to the second switch tube S₂Second pole and third switching tube S₃Between the second poles of (1), an inductance L₁Is connected to the second terminal of the rectifying unit 102.

Inductor L₁The other end of the rectifying unit 102 is used as a third end of the rectifying unit 102, and the fourth end of the rectifying unit 102 is a ground end.

A first capacitor C_FLYAnd the other pole of the rectifier unit 102 is connected to the third terminal of the rectifier unit or ground.

First switch tube S₁Third pole, second switch tube S₂Third pole, third switch tube S₃Third and fourth switching tubes S₄Are connected to the controller 101.

The controller 101 is used for switching the first switch tube S according to the current working condition₁Third pole, second switch tube S₂Third pole, third switch tube S₃Third and fourth switching tubes S₄The third pole of the switching unit transmits a driving signal to switch the working phase of the rectifying unit 102, wherein the current working condition is any one of the receiving working conditions corresponding to the receiving mode.

With regard to the switching of the receiving condition, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 3, and the bidirectional wireless charging transceiver circuit 10 further includes a first comparator CMP₁A second comparator and a selector U₁First comparator CMP₁Is connected to the first end of the resonant cavity, a first comparator CMP₁The non-inverting input terminal of (1) is grounded, and a first comparator CMP₁And the selector U₁Is connected to a selector U₁Is connected with the controller 101, the inverting input terminal of the second comparator is connected with the second terminal of the resonant cavity 103, the non-inverting input terminal of the second comparator is grounded, and the output terminal of the second comparator is connected with the controller 101.

The second comparator is used for collecting a second level signal (V in FIG. 3) of the second end of the resonant cavity 103_AC1) When the second level signal is greater than 0, the second output signal is 0, and when the second level signal is less than 0, the second output signal is at high level, wherein the first output signal is at high levelThe two output signals are output signals of the second comparator.

First comparator CMP₁For collecting a first level signal (V in FIG. 3) at a first end of the cavity 103_AC2) When the first level signal is greater than 0, the first output signal is 0, and when the first level signal is less than 0, the first output signal is high level, wherein the first output signal is the first comparator CMP₁The output signal of (1).

In the case that the mode signal is a reception start signal, the selector U₁For forwarding the first output signal to the controller 101.

The controller 101 is configured to switch the current operating condition according to the first output signal, the second output signal, and the resonant current.

In a possible implementation, the first level signal is in a floating state and the first comparator CMP is in a floating state during the initial stage of switching to the receiving mode₁The corresponding first output signal is 0, the selector U₁The first output signal is forwarded to the controller 101 as 0. When the circuit in the receiving mode is close to the transmitting end, a periodic resonant current is generated in the cavity 103, and thus the level of the first end of the cavity 103 is affected, i.e. the level of the first level signal is affected. When the first level signal is smaller than 0, the resonant current flows from the first end to the second end (i.e. the predetermined direction) of the resonant cavity 103, and the first output signal is at a high level. That is, the first output signal received by the controller 101 changes from 0 to high level, and at this time, the receiving condition starts to be executed, and a driving signal is sent to the rectifying unit 102 to drive it to operate.

On the basis of the foregoing, regarding the receiving condition, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 4 to 7, where the receiving condition includes a first receiving condition

Second receiving condition

And a third receiving condition

First switch tube S₁Of the third pole as V in FIG. 3_G1A second switch tube S₂Of the third pole as V in FIG. 3_G2A third switching tube S₃Of the third pole as V in FIG. 3_G3Fourth switch tube S₄Of the third pole as V in FIG. 3_G4。

The first receiving condition is that the controller 101 switches to the second switch tube S₂Third and fourth switching tubes S₄The third pole of the switch outputs a high level signal to make the second switch tube S₂And a fourth switching tube S₄Is conducted to the first switch tube S₁Third pole and third switch tube S₃The third pole of the switch outputs a low level signal to make the first switch tube S₁And a third switching tube S₃And (5) disconnecting.

The second receiving condition is that the controller 101 switches to the second switch tube S₂Third and fourth switching tubes S₄The third pole of the switch outputs a low level signal to make the second switch tube S₂And a fourth switching tube S₄Is disconnected and is supplied to the first switch tube S₁Third pole and third switch tube S₃The third pole of the switch outputs a high level signal to make the first switch tube S₁And a third switching tube S₃And conducting.

The third receiving condition includes a first interval (corresponding to t in fig. 7)₂) The second interval corresponds to t in FIG. 7₂To t₃In between) and the third section corresponds to (t) in fig. 7₃)。

The first interval is from the controller 101 to the fourth switch tube S₄The third pole outputs high level signal to make the fourth switch tube S₄Is conducted to the first switch tube S₁Third pole, second switch tube S₂Third pole and third switch tube S₃The third pole of the switch outputs a low level signal to make the first switch tube S₁A second switch tube S₂And a third switch S₃The tube is disconnected.

The second interval is from the controller 101 to the first switch tube S₁Third pole and third poleFour-switch tube S₄The third pole of the switch outputs a high level signal to make the first switch tube S₁And a fourth switching tube S₄Is conducted to the second switch tube S₂Third pole and third switch tube S₃The third pole of the switch outputs a low level signal to make the second switch tube S₂And a third switching tube S₃And (5) disconnecting.

The third interval is from the controller 101 to the first switch tube S₁The third pole of the switch outputs a high level signal to make the first switch tube S₁The switch tube is conducted to the second switch tube S₂Third pole, third switch tube S₃Third and fourth switching tubes S₄The third pole of the switch outputs a low level signal to make the second switch tube S₂A third switch tube S₃And a fourth switching tube S₄And (5) disconnecting.

Under the condition that the current working condition is the first receiving working condition, when the resonant current is changed from the negative direction to the positive direction, the controller 101 is used for switching the first interval to a new current working condition; when the first output signal changes from 0 to high level, the controller 101 is configured to switch the second interval to a new current operating condition.

When the second output signal has a high level changed to 0, the controller 101 is configured to switch the third interval to a new current operating condition, and switch the transistor S on the third switch₃The first pole level of the first switch tube is higher than that of the third switch tube S₃After the second pole level, the controller 101 is configured to switch the second receiving condition to a new current condition.

Specifically, when the first output signal changes from 0 to high level, it means that the first level signal changes from greater than 0 to less than 0, and possibly, the first level signal approaches 0 at this time. I.e. the first switch tube S₁Is grounded, i.e. the level is 0, and a first switch tube S₁The other end of the first level signal is the first end of the resonant cavity, and the level of the first level signal is the first switch tube S₁At the level of the other end of the first switching tube S₁The pressure difference between the two ends of the first switch tube S is close to 0₁Switching to a conducting state from a first interval to a second interval to realize a first switch tube S₁Zero voltage switching of (2).

Due to the inductive current I_LIn the presence of, and I_L>I_RX(resonant Current), S₃Turn-on at zero voltage becomes difficult. To realize S₃The third receiving condition is executed after the first receiving condition. By using a power inductor L of smaller inductance value₁，I_LCan be reduced to I_RXThe following. When S is₄After shutdown, I_RX-I_LThe level V of the second end of the resonant cavity 103_AC1(second level signal) to a high voltage. In the third switch tube S₃The first pole level of the first switch tube is higher than that of the third switch tube S₃After the second pole level, the controller 101 is configured to switch the second receiving condition to a new current condition. S₃It can be turned on at zero voltage.

In particular, may be at S₃The two poles of the first comparator are respectively connected with two input ends of a third comparator, and when the output signal of the third comparator is 0 or 1, the third comparator represents a third switching tube S₃Is higher than the second pole level.

Non-inverting input terminal of third comparator and third switch tube S₃The reverse input end of the third comparator is respectively connected with the third switch tube S₃The second pole connection, or vice versa, may be specifically set according to the scene.

It should be noted that the power inductor L₁The value of (a) is related to the resonant frequency and needs to satisfy the inductive current I_LCan be smaller than I at this time when the value of (A) is minimum_RX(resonant current), so that the power inductance L₁Is less than a particular threshold.

Please refer to fig. 4-7, wherein phi₁In (I)_RXIn a negative half-cycle while giving C_FLYAnd charging of the battery, L₁The intermediate stored energy is reduced and the battery is charged. At phi₂In (I)_RXIn a positive half cycle and charging the battery, C_FLYBy passing a current I_DISTo L₁Energy is transferred. At phi₃In (I)_RXFree-running in resonant coils, L₁The intermediate stored energy is reduced and the battery is charged. AC voltage V at the receiving end_AC1And V_AC2Is approximately equal to V_{DCH_RX}. Further, the voltage conversion ratio A_RX＝V_{BAT_RX}/V_{DCH_RX}. When V is constant under the condition of constant rated power for charging battery_{DCH_RX}When increased, helps to reduce I_RXThereby reducing the consumption. A. the_RXFrom S₃Is determined. In the combination of FIG. 7-the illustrated combination of reception conditions, S₃Duty ratio of D<0.5, therefore, A_RX<0.5。

Optionally, let the inductance L₁A voltage drop of Δ V across_L1And then:

ΔV_L1＝V_AC1-V_{BAT_RX} (1)；

when S is₃When the LED is conducted;

ΔV_L1＝V_{DCH_RX}-V_{BAT_RX} (2)；

at this time, the inductance L₁Current, I_L1Rise, the rise amplitude is:

wherein, T_S3Is S₃The switching period of (a);

when S is₃Is turned off and S₄When the LED is conducted;

ΔV_L1＝-V_{BAT_RX}and Δ V_L1<0；

At this time, I_L1And (3) decreasing, wherein the decreasing amplitude is as follows:

when the circuit is operating in a steady state;

ΔI_{L1_ON}＝ΔI_{L1_OFF} (5)；

from equations (3), (4) and (5), it can be deduced that:

namely A_RX＝D。

To make V_{DCH_RX}In addition, the embodiment of the present application further provides a possible implementation manner, please continue to refer to fig. 7, and as shown by the combination two in fig. 7, the receiving condition further includes a fourth receiving condition.

The fourth receiving condition is that the controller 101 turns to the first switch tube S₁Third and fourth switching tubes S₄The third pole of the switch outputs a high level signal to make the first switch tube S₁And a fourth switching tube S₄Is conducted to the second switch tube S₂Third pole and third switch tube S₃The third pole of the switch outputs a low level signal to make the second switch tube S₂And a third switching tube S₃And (5) disconnecting.

Under the condition that the current working condition is the second receiving working condition, when the resonant current is changed from the positive direction to the negative direction, the controller 101 is used for switching the fourth receiving working condition to a new current working condition; after a preset time interval, the controller 101 is configured to switch the first receiving condition to a new current condition, where the preset time interval is an integer multiple of the resonant current conversion period.

In particular, in the fourth receiving condition, the third switch tube S₃Open, the third switch tube S₃The duty cycle D of (a) is significantly reduced, as shown in fig. 7 by the combination two, D<0.25, therefore, A_RX<0.25, i.e. V_{DCH_RX}＞4V_{BAT_RX}. When V is_{DCH_RX}Increasing, i.e. decreasing, decreasing I_RXThereby reducing the consumption.

On the basis, the second switch tube S is used for switching the current working condition from the fourth receiving working condition to the first receiving working condition₂The embodiment of the present application also provides a possible implementation manner, please refer to the following.

After the fourth receiving working condition is taken as the current working condition and lasts for a preset time interval, the first switching tube S is switched off₁In the second switch tube S₂Is higher than the second switch tube S₂Of the second pole (V)_{DCH_RX}) Then, the second switch tube S is connected₂Is conducted to realize the second switch tube S₂The zero voltage of (2) is on. A second switch tube S₂The first pole level of (2) is changed as shown in the combination of two and t in FIG. 7₁Middle V_AC2As shown.

Similarly, the fourth switch tube S is switched from the second receiving working condition to the first receiving working condition in the process of the current working condition₄The embodiment of the present application also provides a possible implementation manner, please refer to the following.

At the initial moment of switching, the third switching tube S is firstly turned off₃In the fourth switch tube S₄Is lower than the fourth switch tube S₄Is grounded, the fourth switch tube S is turned on₄Is conducted to realize the fourth switch tube S₄The zero voltage of (2) is on. Fourth switch tube S₄The first pole level of (1) is changed as shown by t in the combination of (1) in FIG. 7₁Middle V_AC1As shown.

It should be noted that the controller 101 may obtain the second switching tubes S through the corresponding comparators respectively₂Two-pole level and a fourth switching tube S₄The relationship between the levels of the two poles is not described herein.

In one possible implementation, the first comparator CMP₁Is also connected directly to the controller 101 (i.e. without the selector U)₁) In the case where the mode signal is a transmission start signal, the selector U₁For forwarding the received clock signal (CLK) to the controller 101.

The controller 101 is configured to receive the clock signal and then output a discharge current (I) according to the first output signal, the second output signal and the clock signal_TX) And switching the current working condition.

The emission conditions include a first emission condition (beta)₁) Second emission regime (beta)₂) And a third emission regime (β)₃) Possibly, a fourth emission regime (β) is also included₄) Please refer to fig. 8 to 11.

The first transmission condition is that the controller 101 is switched to the second switch tube S₂Third pole ofAnd a fourth switching tube S₄The third pole of the switch outputs a high level signal to make the second switch tube S₂And a fourth switching tube S₄Is conducted to the first switch tube S₁Third pole and third switch tube S₃The third pole of the switch outputs a low level signal to turn off the first switch tube S1 and the third switch tube S3.

As shown in FIG. 11, in the first transmission condition, the first level signal (V)_AC2High) is approximately equal to V_{DCH_TX}Comparator U with negative discharge current direction₁The first output signal is 0, and the second level signal (V) is_AC1Low) is approximately equal to 0.

The second transmitting condition is that the controller 101 transmits the signal to the second switch tube S₂Third and fourth switching tubes S₄The third pole of the switch outputs a low level signal to make the second switch tube S₂And a fourth switching tube S₄Is disconnected and is supplied to the first switch tube S₁Third pole and third switch tube S₃The third pole of the switch outputs a high level signal to make the first switch tube S₁And a third switching tube S₃And conducting.

As shown in FIG. 11, in the second transmission condition, the first level signal (V)_AC2Low level) is approximately equal to 0, the discharge current direction is positive, and the comparator U₁The first output signal is 0, and the second level signal (V) is_AC1High) is approximately equal to V_{DCH_TX}。

The third transmitting working condition and the fourth transmitting working condition are the same and are both from the controller 101 to the first switch tube S₁Third and fourth switching tubes S₄The third pole of the switch outputs a high level signal to make the first switch tube S₁And a fourth switching tube S₄Is conducted to the second switch tube S₂Third pole and third switch tube S₃The third pole of the switch outputs a low level signal to make the second switch tube S₂And a third switching tube S₃And (5) disconnecting. It should be noted that the third and fourth emission conditions are performed for different durations.

Taking the current working condition as the second transmitting working condition as an example, when the third switch tube S₃First pole ofFlat (V)_AC1Second level signal) is lower than the third switch tube S₃Second pole level (V)_{DCH_TX}) Then, the third switch tube S₃Is turned off when the third switch tube S₃First pole level (V) of_AC1Second level signal) is equal to 0, the fourth switch tube S is switched on₄And conducting, namely switching the current working condition from the second transmission working condition to the third transmission working condition. Wherein, the third switch tube S₃First pole level (V) of_AC1Second level signal) as t in fig. 11₆As shown.

As shown in the first combination in fig. 11, when the current operating mode is the third emission operating mode, the first switch tube S is turned to the high level when the CLK becomes the high level₁Off, the second switching tube S₂First pole level (V) of_AC2The first level signal) starts to rise. In the second switch tube S₂First pole level (V) of_AC2First level signal) approximately equal to the second switch tube S₂Second pole level (V)_{DCH_TX}) Then, the second switch tube S is connected₂And conducting, namely switching the current working condition from the third transmission working condition to the first transmission working condition. Wherein, the second switch tube S₂First pole level (V) of_AC2First level signal) as t in fig. 11₄As shown.

Referring to fig. 11, when the current operating mode is the first transmitting operating mode, when the CLK becomes low, the second switch tube S is turned on₂Turn off, first switch tube S₁First pole level (V) of_AC2The first level signal) starts to fall. In the first switch tube S₁First pole level (V) of_AC2First level signal) is approximately equal to the first switch tube S₁At the second level (0, ground), the fourth switch tube S is turned on₄Turning off the first switch tube S₁And conducting, namely switching the current working condition from the first transmission working condition to the second transmission working condition. Wherein, the first switch tube S₁First pole level (V) of_AC2First level signal) as t in fig. 11₅As shown.

In addition, the fourth switching tube S₄After shutdown, V_AC1Will quickly rise to high levelAnd is approximately equal to V_{DCH_TX}Then, the third switch tube S₃And conducting.

As described above with reference to the reception mode, due to the inductor current I_LIn the presence of, and I_L>I_TX(discharge Current), S₄Turn-on at zero voltage becomes difficult. To realize S₄The third transmission operating mode needs to be executed after the second transmission operating mode. By using a power inductor L of smaller inductance value₁，I_LCan be reduced to I_TXThe following. When S is₃After being turned off, when the fourth switch tube S₄First pole level (V) of_AC1Second level signal) is continuously reduced until the second level signal is lower than 0, and in a fourth switch tube S₄Is approximately equal to the fourth switching tube S₄After the second pole level (0, ground), the controller 101 is used to switch the fourth switch S₄Conduction, S₄It can be turned on at zero voltage.

With continued reference to the reception mode, to lower the third switch S₃Occupancy ratio of (a). Voltage conversion ratio of emission mode, A_TX＝V_{DCH_TX}/V_{BAT_TX}In fig. 11, combination one is greater than 2, and in combination two is greater than 4.

Specifically, referring to the combination two in fig. 11, after the third occurrence condition, the fourth emission condition is switched in, and when the discharge current changes from the positive direction to the negative direction, the controller 101 is configured to switch the fourth emission condition to the new current condition; after a preset time interval, the controller 101 is configured to switch the first transmission operating condition to a new current operating condition, where the preset time interval is an integer multiple of the discharge current conversion period.

With continued reference to fig. 3, in one possible implementation, the rectifying unit 102 further includes a second capacitor C₀A second capacitor C₀Are connected to the third terminal and the fourth terminal of the rectifying unit 102, respectively.

Second capacitor C₀And the method is used for filtering and eliminating interference.

On the basis of fig. 2, for the structure of the resonant cavity 103, the embodiment of the present application further provides a possible implementation mannerWith continued reference to FIG. 3, the resonant cavity 103 includes a resonant coil (L)_TXAnd L_RXCorresponding to a transmission mode and a reception mode, respectively) and a resonance capacitance C_RESOne end of the resonance coil is connected with one pole of the resonance capacitor, and the other end of the resonance coil and the other pole of the resonance capacitor are respectively used as a first end and a second end of the resonance cavity.

In fig. 3, two poles of the resonant capacitor are respectively connected with one end of the resonant coil and the inductor L₁Is connected to one end of the resonant coil, and in one possible implementation, the two ends of the resonant coil are respectively connected to one pole of the resonant capacitor and the inductor L₁Is connected to one end of the first and second connecting members, and is not limited herein.

It should be noted that the fourth switch tube S is considered to flow through₄Has a large current value, and is used for ensuring the fourth switching tube S₄Life and safety of, a fourth switching tube S₄Using gallium nitride transistors, S₁～S₃Mos tubes were used.

In one possible implementation, S₁And S₄Is an NMOS structure or the like, S₂And S₃Either a PMOS structure or a similar structure.

The embodiment of the present application further provides an electronic device, and it should be noted that the electronic device includes the bidirectional wireless charging transceiver circuit 10 as described above. The electronic device provided in this embodiment can perform the function of the bidirectional wireless charging transceiver circuit 10, so as to achieve the corresponding technical effect. For the sake of brevity, the corresponding contents in the above embodiments may be referred to where not mentioned in this embodiment.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A bidirectional wireless charging transceiver circuit is characterized by comprising a controller, a resonant cavity and a rectifying unit;

2. The bidirectional wireless charging transceiver circuit of claim 1, wherein the rectifying unit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, an inductor, and a first capacitor;

3. The bidirectional wireless charging transceiver circuit of claim 2, further comprising a first comparator, a second comparator and a selector, wherein an inverting input of the first comparator is connected to the first end of the resonant cavity, a non-inverting input of the first comparator is connected to ground, an output of the first comparator is connected to the first input of the selector, an output of the selector is connected to the controller, a non-inverting input of the second comparator is connected to the second end of the resonant cavity, a non-inverting input of the second comparator is connected to ground, and an output of the second comparator is connected to the controller;

4. The bidirectional wireless charging transceiver circuit of claim 3, wherein the reception conditions include a first reception condition, a second reception condition, and a third reception condition;

5. The bi-directional wireless charging transceiver circuit of claim 4, wherein the receive conditions further include a fourth receive condition;

6. The bi-directional wireless charging transceiver circuit of claim 3, wherein the output terminal of the first comparator is further connected to the controller, and the selector is configured to forward the received clock signal to the controller if the mode signal is a transmission start signal;

7. The bi-directional wireless charging transceiver circuit of claim 2, wherein the rectifying unit further comprises a second capacitor, and two poles of the second capacitor are respectively connected to the third terminal and the fourth terminal of the rectifying unit.

8. The bidirectional wireless charging transceiver circuit of claim 1, wherein the resonant cavity comprises a resonant coil and a resonant capacitor, one end of the resonant coil is connected to one pole of the resonant capacitor, and the other end of the resonant coil and the other pole of the resonant capacitor are respectively used as the first end and the second end of the resonant cavity.

9. An electronic device, characterized in that the electronic device comprises a bidirectional wireless charging transceiver circuit according to any one of claims 1-8.