CN115842419A

CN115842419A - Wireless charging receiving end circuit, system and chip

Info

Publication number: CN115842419A
Application number: CN202111098528.3A
Authority: CN
Inventors: �田�浩; 陈锐; 郑毅成; 张俊; 徐鑫勇
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2023-03-24
Also published as: WO2023040507A1

Abstract

The embodiment of the application discloses a wireless charging receiving end circuit, a wireless charging receiving end system and a wireless charging receiving end chip, which are used for setting constant working current and controlling the working state through a constant current module. The method in the embodiment of the application comprises the following steps: the device comprises a resonant coil module, a rectification filter module, a constant voltage module and a constant current module; the rectification filtering module is respectively connected with the resonance coil module and the constant voltage module, and the constant voltage module is connected with the constant current module; the constant current module is used for outputting constant current.

Description

Wireless charging receiving end circuit, system and chip

Technical Field

The application relates to the field of wireless charging, in particular to a wireless charging receiving end circuit, a wireless charging receiving end system and a wireless charging receiving end chip.

Background

Fig. 1 is a schematic diagram of a wireless charging receiving end circuit in an implementation manner. The receiving end circuit comprises a receiving coil, a compensation capacitor, a synchronous rectifier tube and a linear voltage stabilizing circuit (MLDO) tube capable of stabilizing voltage, and the rear end of the receiving end circuit is connected with a charger (charger) to charge the battery. Among them, the wireless charging Integrated Circuit (IC) includes a rectifying and LDO voltage-stabilizing output part, which is generally Integrated. However, the wireless charging IC can set the operating voltage to control the operating state, and cannot set the operating current to control the operating state.

Disclosure of Invention

The embodiment of the application provides a wireless charging receiving end circuit, a wireless charging receiving end system and a wireless charging receiving end chip, which are used for setting constant working current and controlling the working state through a constant current module.

The present application provides in a first aspect a wireless charging receiving-end circuit, which may include: the device comprises a resonant coil module, a rectification filter module, a constant voltage module and a constant current module;

the rectification filtering module is respectively connected with the resonance coil module and the constant voltage module, and the constant voltage module is connected with the constant current module;

and the constant current module is used for outputting constant current.

A second aspect of the present application provides a wireless charging system, which may include the wireless charging receiving-end circuit of the first aspect.

A third aspect of the present application provides a wireless charging chip, which may include the wireless charging receiving-end circuit of the first aspect.

According to the technical scheme, the embodiment of the application has the following advantages:

in this embodiment of the present application, the wireless charging receiving terminal circuit may include: the device comprises a resonance coil module, a rectification filter module, a constant voltage module and a constant current module; the rectification filtering module is respectively connected with the resonance coil module and the constant voltage module, and the constant voltage module is connected with the constant current module; the constant current module is used for outputting constant current. Namely, the constant working current can be set through the constant current module, and the working state is controlled.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the embodiments and the drawings used in the description of the prior art, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the drawings.

Fig. 1 is a schematic diagram of a wireless charging receiving end circuit in an implementation manner;

fig. 2A is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure;

fig. 2B is another schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure;

fig. 2C is another schematic diagram of a wireless charging receiving circuit according to an embodiment of the present disclosure;

fig. 2D is another schematic diagram of a wireless charging receiving circuit according to an embodiment of the disclosure;

fig. 2E is another schematic diagram of a wireless charging receiving end circuit according to an embodiment of the disclosure;

fig. 2F is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present application;

fig. 2G is another schematic diagram of a wireless charging receiving circuit according to an embodiment of the present disclosure;

fig. 3A is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure;

fig. 3B is another schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure;

fig. 3C is another schematic diagram of a wireless charging receiving circuit according to an embodiment of the present disclosure;

fig. 3D is another schematic diagram of a wireless charging receiving end circuit according to an embodiment of the disclosure;

fig. 3E is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present application;

fig. 3F is a schematic diagram of a rectifying and filtering module in a wireless charging receiving end circuit according to an embodiment of the present disclosure;

fig. 3G is another schematic diagram of a rectifying and filtering module in a wireless charging receiving end circuit according to an embodiment of the present disclosure;

fig. 4A is a schematic diagram of an embodiment of a wireless charging system according to the present application;

fig. 4B is a schematic diagram of another embodiment of the wireless charging system in the embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The embodiments in the present application shall fall within the protection scope of the present application.

In the embodiment of the application, a Constant Current (CC) function is added on the basis that a wireless charging IC includes a rectifying and filtering function, and further, an Over Current Protection (OCP) function and an Over Voltage Protection (OVP) function can be added, because wireless charging is compared with wired charging, the mobile terminal can change charging power due to movement, and additional functions are added to ensure charging stability, and all positions of the functions in the whole charging loop belong to the protection range of the application.

The following describes the technical solution of the present application by way of an embodiment, and as shown in fig. 2A, the technical solution is a schematic diagram of a wireless charging receiving-end circuit in the embodiment of the present application. The wireless charging receiving end circuit may include: the device comprises a resonant coil module 21, a rectifying and filtering module 22, a constant voltage module 23 and a constant current module 24;

the rectifying and filtering module 22 is respectively connected with the resonant coil module 21 and the constant voltage module 23, and the constant voltage module 23 is connected with the constant current module 24;

and the constant current module 24 is used for outputting constant current.

In this embodiment of the present application, the wireless charging receiving terminal circuit may include: the device comprises a resonant coil module 21, a rectifying and filtering module 22, a constant voltage module 23 and a constant current module 24; compared with the prior art, the constant current module 24 is added, namely, the constant working current can be set through the constant current module 24 to control the working state. The wireless charging receiving end circuit can directly charge the battery or supply power to other equipment.

Optionally, the constant current module 24 includes a switching circuit 241 and a control module 242;

and a control module 242 for controlling the switching circuit 241 to output the constant current.

For example, as shown in fig. 2B, another schematic diagram of a wireless charging receiving end circuit in the embodiment of the present application is shown. In the embodiment of the present application, the constant current module 24 may include a switching circuit 241 and a control module 242; the switching circuit 241 is controlled by the control module 242 to output the constant current. The wireless charging receiving end circuit can directly charge the battery or supply power to other equipment.

Optionally, the switching circuit 241 includes:

the NMOS switching circuit comprises a first NMOS switch Q1 and a second NMOS switch Q2, wherein the source electrode of the first NMOS switch Q1 is connected with the source electrode of the second NMOS switch Q1; or the like, or, alternatively,

gallium nitride switch Q7.

It should be noted that the first NMOS switch Q1 and the second NMOS switch Q2 may be two NMOS switches B2B, in order to connect the left and right ends of Q1 and Q2; it may also be a GaN to implement the charging process.

For example, as shown in fig. 2C, another schematic diagram of a wireless charging receiving end circuit in the embodiment of the present application is shown. In fig. 2C, the switching circuit 241 includes: a first NMOS switch Q1 and a second NMOS switch Q2. It is understood that the first NMOS switch Q1 and the second NMOS switch Q2 are isolation NMOS switches, which are kept connected when charging, and are kept disconnected when not charging.

For example, as shown in fig. 2D, another schematic diagram of a wireless charging receiving end circuit in the embodiment of the present application is shown. In fig. 2D, the switching circuit 241 includes: a gallium nitride switch Q7. It is understood that the isolation NMOS switch formed by the first NMOS switch Q1 and the second NMOS switch Q2 may be replaced by a gallium nitride switch.

Optionally, the control module 242 is further configured to perform at least one of the following:

controlling the switching circuit 241 to perform current-limiting feedback according to the first control signal;

according to the second control signal, the switch circuit 241 is controlled to perform overvoltage protection;

and according to a third control signal, controlling the switch circuit 241 to perform overcurrent protection.

Optionally, the first control signal, the second control signal, and the third control signal are generated by the same controller, or generated by different controllers.

Optionally, the control module 242 may further include at least one of a current limit feedback module 2421, an overvoltage protection module 2422, and an overcurrent protection module 2423.

Optionally, the current-limiting feedback module 2421 is connected to the gates of the first NMOS switch Q1 and the second NMOS switch Q2;

a first end of the overvoltage protection module 2422 is connected with the drain of the first NMOS switch Q1, and a second end of the overvoltage protection module 2422 is connected with the gate of the first NMOS switch Q1;

a first end of the over-current protection module 2423 is connected to the drain of the second NMOS switch Q2, and a second end of the over-current protection module 2423 is connected to the gate of the second NMOS switch Q2.

For example, as shown in fig. 2E, fig. 2F and fig. 2G, another schematic diagram of a wireless charging receiving end circuit in the embodiment of the present application is shown. It is understood that the current limit Feedback (FB) module 2421, the overvoltage protection module 2422, and the overcurrent protection module 2423 may be implemented by generating different control signals by the same controller, or by generating respective control signals by different controllers, which is not limited herein. The current limit feedback may also be referred to as current sample feedback.

In the embodiment of the present application, an optional implementation manner for the constant current module 24 is provided, which may include a first NMOS switch Q1, a second NMOS switch Q2, and a control module 242; or a gallium nitride switch Q7 and a control module 242. The control module 242 may further include at least one of a current limiting feedback module 2421, an overvoltage protection module 2422, and an overcurrent protection module 2423, among others. By controlling the switching of the first NMOS switch Q1 and the second NMOS switch Q2, the current limit Feedback (FB) module 2421 can output a stable current, which does not fluctuate when the wireless charging receiving end dynamically changes, and provides a Constant Current (CC) function; the overvoltage protection module 2422 can provide overvoltage protection and the overcurrent protection module 2423 can provide overcurrent protection.

Namely, Q1 and Q2, current sampling feedback and OCP/OVP functions are added to the IC end, and the functions or similar protection functions can be added at any position in the IC. When boosting/reducing voltage, the transmitting end is also required to be matched.

The current limiting feedback module 2421 controls the voltage to the load (battery) by controlling the first NMOS switch Q1 and the second NMOS switch Q2 to adjust in the variable resistance region, where the control output voltage is the sum of the voltages on the load (battery) and Q1& Q2, and by changing the impedance of Q1& Q2 to implement the voltage division change, so as to control the voltage to the load (battery), thereby implementing the desired operating current, and this voltage sampling, current sampling, and calculation, etc. can be written in the control Core (Digital Core) of the control module 242.

An overvoltage protection module 2422, if the protection is hardware protection, the standard voltage and the sampling voltage can be compared through a hardware voltage comparator, and when the overvoltage value is reached, the voltage comparator is turned over to protect; if the protection is software protection, the voltage is sampled, and the IC protection is controlled after the digital core calculation.

The overcurrent protection module 2423 can compare the standard current with the sampling current through a hardware current comparator if the current is hardware protection, and the current comparator is turned over to protect when the overcurrent value is reached; if the protection is software protection, the current is sampled, and the IC protection is controlled after the calculation of the digital core.

That is, it can be understood that the current limiting feedback module 2421, the overvoltage protection module 2422 and the overcurrent protection module 2423 can all implement their respective functions through digital core control. The digital core is herein understood to be a controller.

Optionally, the resonant coil module 21, the rectifying and filtering module 22, and the constant voltage module 23 are integrated on the first chip.

Optionally, the switch circuit 241 is integrated on the first chip or the second chip.

Optionally, the control module 242 is integrated on the first chip, the second chip, or a third chip.

Fig. 3A is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure. In fig. 3A, the resonance coil module 21, the rectifying and smoothing module 22, and the constant voltage module 23 and the constant current module 24 are integrated in the first chip.

Fig. 3B is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure. In fig. 3B, the resonant coil module 21, the rectifying-filtering module 22, and the constant voltage module 23, and the switching circuit 241 in the constant current module 24 are integrated on a first chip (e.g., IC-1), and the control module 242 in the constant current module 24 is integrated on a second chip.

Fig. 3C is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure. In fig. 3C, the resonance coil module 21, the rectifying and smoothing module 22, and the constant voltage module 23, and the control module 242 in the constant current module 24 are integrated on a first chip (e.g., IC-1), and the switching circuit 241 in the constant current module 24 is integrated on a second chip (e.g., IC-2).

Fig. 3D is another schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure. In fig. 3D, the resonance coil module 21, the rectifying and smoothing module 22, and the constant voltage module 23 are integrated on a first chip (e.g., IC-1), and the constant current module 24 is integrated on a second chip (e.g., IC-2).

Fig. 3E is a schematic diagram of a wireless charging receiving end circuit according to an embodiment of the present disclosure. In fig. 3E, the resonance coil module 21, the rectifying-smoothing module 22, and the constant voltage module 23 are integrated on a first chip (e.g., IC-1), the switching circuit 241 in the constant current module 24 is integrated on a second chip (e.g., IC-2), and the control module 242 in the constant current module 24 is integrated on a third chip (e.g., IC-3).

It should be noted that the control module 242 may control the switching circuit 241 to perform current limiting feedback according to the first control signal; or, according to the second control signal, the switch circuit 241 is controlled to perform overvoltage protection; or, the switch circuit 241 is controlled to perform the overcurrent protection according to the third control signal. The first control signal, the second control signal, and the third control signal may be generated by the same controller, or may be generated by different controllers. If the controller is generated by different controllers, the several different controllers may be integrated on the same chip or different chips, and are not limited in this respect. If the space on the same chip is limited, different chips can be matched with each other to realize corresponding functions.

Optionally, the rectifying and filtering module 22 includes a full bridge rectifying and filtering circuit or a half bridge rectifying and filtering circuit.

Optionally, the rectifying and filtering module 22 includes a full-bridge rectifying and filtering circuit, the full-bridge rectifying and filtering circuit includes a third NMOS switch Q3, a fourth NMOS switch Q4, a fifth NMOS switch Q5, and a sixth NMOS switch Q6, and the third NMOS switch Q3, the fourth NMOS switch Q4, the fifth NMOS switch Q5, and the sixth NMOS switch Q6 respectively include a diode;

the source of the third NMOS switch Q3 is connected to the drain of the fifth NMOS switch Q5;

the source of the fourth NMOS switch Q4 is connected to the drain of the sixth NMOS switch Q6;

the drain electrode of the third NMOS switch Q3 and the drain electrode of the fourth NMOS switch Q4 are connected with the constant voltage module 23;

the source of the fifth NMOS switch Q5 and the source of the sixth NMOS switch Q6 are grounded.

Optionally, the resonant coil module 21 includes a receiving end coil and a capacitor connected to one end of the receiving end coil; the capacitor is connected with the source electrode of the first NMOS switch Q1 and the drain electrode of the third NMOS switch Q3; the other end of the receiving end coil is connected with the source electrode of the second NMOS switch Q2 and the drain electrode of the fourth NMOS switch Q4.

Illustratively, in fig. 2E, 2F and 2G, the rectifying and filtering module is a full bridge rectifying and filtering circuit. After a receiving end coil in the resonant coil module 21 obtains electric energy from a wireless charging transmitting end through magnetic field coupling, the full-bridge rectifier filter circuit converts alternating current into direct current, and the electric energy is transmitted outwards through a forward voltage output end Vrect. If the user's demand is a voltage stabilization charging, a stable voltage may be output through the constant voltage module 23; or, if the user's demand is a steady current charging, a steady current may be output through the constant current module 24.

Optionally, the rectifying and filtering module 22 includes a half-bridge rectifying and filtering circuit, and the half-bridge rectifying and filtering circuit includes:

the full-bridge rectifier filter circuit is provided with a circuit for deleting the third NMOS switch Q3 and the short-circuiting the fifth NMOS switch Q5; or the like, or, alternatively,

and the full-bridge rectifying and filtering circuit deletes the fourth NMOS switch Q4 and a circuit for short-circuiting the sixth NMOS switch Q6.

It is understood that the rectifying and filtering section may be made in a half-bridge scheme. For example, the Q3 short circuit Q5 shown in fig. 2D may be eliminated, as shown in fig. 3F, which is a schematic diagram of a rectifying and filtering module in the wireless charging receiving-end circuit in the embodiment of the present invention. Alternatively, the Q4 short circuit Q6 shown in fig. 2D is eliminated, and as shown in fig. 3G, it is another schematic diagram of the rectification filtering module in the wireless charging receiving-end circuit in the embodiment of the present application. Compared with a full-bridge scheme, the half-bridge scheme can improve the output voltage and the output gain.

In the embodiment of the application, the wireless charging system is additionally provided with the CC current limiting function which can be used for directly charging the battery, has the OCP/OVP protection function, and realizes that the wireless charging directly charges the battery or other equipment supplies power by a series of protection modes.

As shown in fig. 4A, a schematic diagram of an embodiment of a wireless charging system in an embodiment of the present application may include: as shown in fig. 2A to 2G or any one of fig. 3A to 3G, the wireless charging receiving circuit is described above.

As shown in fig. 4B, which is a schematic view of another embodiment of the wireless charging system in the embodiment of the present application, the method may include: a wireless charging transmitter circuit, and a wireless charging receiver circuit as described above with reference to fig. 2A-2G or any one of fig. 3A-3G.

An embodiment of the present application further provides a wireless charging chip, which may include the wireless charging receiving end circuit described in fig. 2A to fig. 2G or any one of fig. 3A to fig. 3G.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A wireless charging receiving-end circuit, comprising:

the device comprises a resonance coil module, a rectification filter module, a constant voltage module and a constant current module;

the constant current module is used for outputting constant current.

2. The wireless charging receiving-end circuit according to claim 1, wherein the constant current module includes a switching circuit and a control module;

and the control module is used for controlling the switch circuit and outputting the constant current.

3. The wireless charging reception-end circuit according to claim 2, wherein the switching circuit comprises:

the source electrode of the first NMOS switch is connected with the source electrode of the second NMOS switch; or the like, or a combination thereof,

a gallium nitride switch.

4. The wireless charging receiving end circuit according to any one of claims 1 to 3, wherein the control module is further configured to perform at least one of:

controlling the switch circuit to perform current limiting feedback according to a first control signal;

controlling the switch circuit to perform overvoltage protection according to a second control signal;

and controlling the switch circuit to perform overcurrent protection according to a third control signal.

5. The wireless charging receiving end circuit of claim 4, wherein the first control signal, the second control signal, and the third control signal are generated by a same controller, or are generated by different controllers.

6. The wireless charging receiving end circuit of claim 5, wherein the resonant coil module, the rectifying and filtering module, and the constant voltage module are integrated on a first chip.

7. The wireless charging receiving end circuit of claim 6, wherein the switch circuit is integrated on the first chip or the second chip.

8. The wireless charging receiving end circuit of claim 7, wherein the control module is integrated on the first chip, the second chip, or a third chip.

9. The wireless charging receiving-end circuit according to any one of claims 1 to 3, wherein the rectifying and filtering module comprises a full-bridge rectifying and filtering circuit or a half-bridge rectifying and filtering circuit.

10. A wireless charging system comprising the wireless charging receiving-end circuit according to any one of claims 1 to 9.

11. A wireless charging chip comprising the wireless charging receiving-end circuit according to any one of claims 1 to 9.