Charging circuit, charging circuit control method and electronic device

Abstract

The present invention relates to a charging circuit, a control method for a charging circuit and an electronic device. The charging circuit includes a wireless power receiving unit, a fast charging path unit and a slow charging path unit connected in parallel between the wireless power receiving unit and a charging output port, and an anti-backflow regulation unit. The anti-backflow regulation unit is connected to the fast charging path unit and the slow charging path unit, respectively. The wireless power receiving unit is used to receive an energy signal transmitted by an external coil and generate a corresponding induced voltage signal. When the induced voltage signal is less than a first preset voltage threshold, the slow charging path unit is turned on to charge the load. When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than a second preset voltage threshold, the anti-backflow regulation unit is started. When the induced voltage signal is greater than the second preset voltage threshold, the fast charging path unit is turned on to charge the load. The second preset voltage threshold is greater than the first preset voltage threshold. The above-mentioned charging circuit improves the charging experience as a whole.

Description

Technical Field

[0001] The present invention relates to the field of circuits, and in particular to a charging circuit, a control method for a charging circuit, and an electronic device. Background Art

[0002] With the development of wireless charging technology, the current wireless charging power is gradually increasing, there are more devices and the logic control is complex. The fast charging in wireless charging generally uses a two-stage step-down circuit to reduce the voltage to 5V to charge the battery. Fast charging and ordinary charging will be charged through different paths. When entering fast charging, it is necessary to follow the fast charging path to achieve the purpose of fast charging.

[0003] Among them, the buck circuit in the above-mentioned fast charging path generally has the function of UCP (Undercurrent Protection) to achieve the purpose of preventing backflow. On the one hand, the energy output by the wireless receiving IC is affected by the position of the coil, especially when the coil position is biased, the output energy is low, resulting in too low current, the UCP function of the buck circuit of the anti-backflow regulation unit is activated, and the buck circuit of the anti-backflow regulation unit is self-closed. On the other hand, when the fast charging is started, the output voltage of the wireless charging is pulled down, the energy is reduced, and the critical point of the UCP protection current value of the buck circuit of the anti-backflow regulation unit is reached, thereby shutting down the buck circuit and interrupting the entire charging process. Summary of the invention

[0004] In view of this, the present invention provides a charging circuit, a control method for a charging circuit and an electronic device. The charging circuit is provided with a wireless power receiving unit, a fast charging path unit and a slow charging path unit connected in parallel between the wireless power receiving unit and the charging output port, and an anti-backflow regulation unit. The anti-backflow regulation unit is respectively connected to the fast charging path unit and the slow charging path unit, so that when the induced voltage signal is less than a first preset voltage threshold, the slow charging path unit is turned on to charge the load, and when the induced voltage signal is greater than or equal to the first preset voltage threshold and less than a second preset voltage threshold, the anti-backflow regulation unit is started to prevent the anti-backflow function corresponding to the fast charging path unit from being started. When the induced voltage signal is greater than the second preset voltage threshold, the fast charging path unit is turned on to charge the load, thereby avoiding the disadvantages of the wireless power receiving unit receiving too low energy or the fast charging path unit being interrupted due to the activation of the corresponding anti-backflow function when the fast charging path unit is just turned on, thereby achieving the purpose of stably turning on the fast charging path unit, and optimizing the charging process and charging experience as a whole.

[0005] A charging circuit includes a wireless power receiving unit, a fast charging path unit and a slow charging path unit connected in parallel between the wireless power receiving unit and a charging output port, and an anti-backflow regulating unit, wherein the anti-backflow regulating unit is connected to the fast charging path unit and the slow charging path unit respectively;

[0006] The wireless power receiving unit is used to receive the energy signal transmitted by the external coil, generate the corresponding induced voltage signal and send it to the fast charging path unit and the slow charging path unit respectively;

[0007] When the induced voltage signal is less than the first preset voltage threshold, the slow charging path unit is turned on to charge the load;

[0008] When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow adjustment unit is activated;

[0009] When the induced voltage signal is greater than a second preset voltage threshold, the fast charging path unit is turned on to charge the load, and the second preset voltage threshold is greater than the first preset voltage threshold.

[0010] In one embodiment, the fast charging path unit includes a first buck module and a second buck module connected in sequence, the slow charging path unit includes a load switch and a charging module connected in sequence, one end of the anti-backflow regulating unit is respectively connected to the first buck module and the second buck module, and the other end of the anti-backflow regulating unit is respectively connected to the load switch and the charging module;

[0011] When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the first step-down module, the anti-backflow regulation unit and the charging module are used to form a series conduction loop to charge the load, and the charging module is also used to shut down after a predetermined time after the fast charging path unit is turned on.

[0012] In one embodiment, the backflow prevention regulating unit adopts a diode or a MOS tube.

[0013] In one embodiment, the maximum current output value of the anti-backflow regulating unit is no more than 1000 mA.

[0014] In one embodiment, the first step-down module uses a switched capacitor DC-DC converter.

[0015] In one embodiment, the second step-down module uses a switched capacitor DC-DC converter.

[0016] In one embodiment, the load switch is a diode or a MOS tube.

[0017] In one embodiment, the charging module adopts a step-down circuit.

[0018] In addition, a control method for a charging circuit is also provided. The control method is applied to the above charging circuit, and the control method includes:

[0019] The wireless power receiving unit receives the energy signal transmitted by the external coil, generates a corresponding induced voltage signal and sends it to the fast charging path unit and the slow charging path unit respectively;

[0020] When the induced voltage signal is less than a first preset voltage threshold, controlling the slow charging path unit to be turned on to charge the load;

[0021] When the induced voltage signal is greater than or equal to a first preset voltage threshold and less than a second preset voltage threshold, the anti-backflow regulating unit is controlled to start;

[0022] When the induced voltage signal is greater than a second preset voltage threshold, the fast charging path unit is controlled to be turned on to charge the load, and the second preset voltage threshold is greater than the first preset voltage threshold.

[0023] In addition, an electronic device is provided, wherein the electronic device is provided with the charging circuit.

[0024] The above-mentioned charging circuit is provided with a wireless power receiving unit, a fast charging path unit and a slow charging path unit connected in parallel between the wireless power receiving unit and the charging output port, and an anti-backflow regulation unit. The anti-backflow regulation unit is respectively connected to the fast charging path unit and the slow charging path unit, so that when the induced voltage signal is less than the first preset voltage threshold, the slow charging path unit is turned on to charge the load, and when the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow regulation unit is started to prevent the anti-backflow function of the components in the fast charging path unit from being activated. When the induced voltage signal is greater than the second preset voltage threshold, the fast charging path unit is turned on to charge the load, avoiding the disadvantages of the wireless power receiving unit receiving too low energy or the fast charging path unit being interrupted due to the activation of the corresponding anti-backflow function when it is just turned on, thereby achieving the purpose of stably turning on the fast charging path unit, and improving and optimizing the charging process and charging experience as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope of protection of the present invention. In each of the drawings, similar components are numbered similarly.

[0026] Figure 1 is a structural block diagram of a charging circuit provided in an embodiment;

[0027] Figure 2 is a structural block diagram of a charging circuit provided in another embodiment;

[0028] Figure 3The figure is a flow chart of a control method of a charging circuit in an embodiment. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] In the following, various embodiments of the present disclosure will be described more fully. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives that fall within the spirit and scope of the various embodiments of the present disclosure.

[0032] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0033] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0034] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present invention belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present invention.

[0035] like Figure 1As shown, a charging circuit 100 is provided, which includes a wireless power receiving unit 110, a fast charging path unit 130 and a slow charging path unit 140 connected in parallel between the wireless power receiving unit 110 and a charging output port 120, and an anti-backflow regulation unit 150, and the anti-backflow regulation unit 150 is respectively connected to the fast charging path unit 130 and the slow charging path unit 140.

[0036] The wireless power receiving unit 110 is used to receive the energy signal transmitted by the external coil, generate a corresponding induced voltage signal and send it to the fast charging path unit 130 and the slow charging path unit 140 respectively.

[0037] When the induced voltage signal is less than the first preset voltage threshold, the slow charging path unit 140 is turned on to charge the load.

[0038] When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the backflow prevention adjustment unit 150 is activated.

[0039] When the induced voltage signal is greater than a second preset voltage threshold, the fast charging path unit 130 is turned on to charge the load, and the second preset voltage threshold is greater than the first preset voltage threshold.

[0040] Among them, when the position of the external coil is offset, the energy output of the wireless power receiving unit 110 is affected, and the corresponding output energy is low. At this time, when the fast charging path unit 130 is started, the anti-backflow function corresponding to the fast charging path unit 130 itself is often started, causing the corresponding circuit components in the fast charging path unit 130 to shut down themselves, so that the charging process is often terminated.

[0041] During the operation of the above-mentioned charging circuit 100, when the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow regulation unit 150 is started to prevent the corresponding circuit components in the fast charging path unit 130 from being turned off due to the activation of the anti-backflow function corresponding to the fast charging path unit 130. When the induced voltage signal is greater than the second preset voltage threshold, the fast charging path unit 130 is turned on to charge the load, so that the fast charging path unit 130 is turned on only when the induced voltage signal is in a stable output state greater than the second preset voltage threshold, thereby avoiding the disadvantages of too low energy received by the wireless power receiving unit 110 or charging interruption caused by the activation of the corresponding anti-backflow function when the fast charging path unit 130 is just turned on, thereby achieving the purpose of stably turning on the fast charging path unit 130, and improving and optimizing the charging process and charging experience as a whole.

[0042] In one embodiment, Figure 2As shown, the fast charging path unit 130 includes a first step-down module 132 and a second step-down module 134 connected in sequence, the slow charging path unit 140 includes a load switch 142 and a charging module 144 connected in sequence, one end of the anti-backflow regulation unit 150 is respectively connected to the first step-down module 132 and the second step-down module 134, and the other end of the anti-backflow regulation unit 150 is respectively connected to the load switch 142 and the charging module 144.

[0043] The wireless power receiving unit 110 is used to receive the energy signal transmitted by the external coil, generate a corresponding induced voltage signal and send it to the first buck module 132 .

[0044] Among them, when the position of the external coil is offset, the energy output of the wireless power receiving unit 110 is affected, and the output energy is low at this time. When the output induced voltage signal of the wireless power receiving unit 110 is less than the first preset voltage threshold, the load switch 142 is closed, the charging module 144 is turned on, and the entire slow charging path unit 140 is turned on to charge the load.

[0045] The first step-down module 132 is used to initially step down the induced voltage signal and generate a primary step-down signal. When the primary step-down signal is equal to the preset starting voltage threshold of the second step-down module 134, the corresponding induced voltage signal must be equal to a certain voltage value. Here, it is assumed that the corresponding induced voltage signal at this time is the second preset voltage threshold.

[0046] When the induced voltage signal is greater than the first preset voltage threshold and less than the second preset voltage threshold (at this time the corresponding primary step-down signal must be less than the preset starting voltage threshold of the second step-down module 134), the fast charging path unit 130 corresponding to the second step-down module 134 is still in a disconnected state. At this time, the anti-backflow regulation unit 150 is further started, and the first step-down module 132, the anti-backflow regulation unit 150 and the charging module 144 form a conductive loop to charge the load.

[0047] Further, when the induced voltage signal is greater than the second preset voltage threshold, the second buck module 134 is started to turn on the fast charging path unit 130 to charge the load, and the charging module 144 is turned off after a predetermined time after the fast charging path unit 130 is turned on.

[0048] Among them, when the above-mentioned second step-down module 134 is just started and turned on, the output voltage of the wireless power receiving unit 110 is instantly pulled down. At this time, the output energy is reduced, and the second step-down module 134 will self-shut down due to the overcurrent protection mechanism turning on the anti-backflow function. At this time, the anti-backflow regulation unit 150 is further started, and the first step-down module 132, the anti-backflow regulation unit 150 and the charging module 144 form a conduction loop to charge the load, which can avoid the shortcoming of the second step-down module 134 self-shutdown due to the overcurrent protection mechanism turning on the anti-backflow function. The charging module 144 can only be turned off after the fast charging path unit 130 is turned on (that is, the second step-down module 134 is turned on) for a predetermined time, so that the output of the fast charging path unit 130 can be further stabilized, further improving the output stability of the above-mentioned charging circuit 100, and further improving and optimizing the charging process and charging experience as a whole.

[0049] In one embodiment, the predetermined time is 1 second.

[0050] The above-mentioned charging circuit 100 is provided with an anti-backflow regulating unit 150, so that when the induced voltage signal is less than the first preset voltage threshold, the load switch 142 is closed to turn on the slow charging path unit 140, thereby charging the load, and then further when the induced voltage signal is greater than the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow regulating unit 150 is further started, the first step-down module 132 and the anti-backflow regulating unit 150 form a conduction loop to charge the load, and when the induced voltage signal is greater than the second preset voltage threshold, the second step-down module 134 is started to turn on the fast charging path unit 130 to charge the load, and the charging module 144 is turned off after a predetermined time after the fast charging path unit 130 is turned on, thereby avoiding the disadvantages of the wireless power receiving unit 110 receiving too low energy or the fast charging path unit 130 being interrupted due to the activation of the corresponding anti-backflow function when it is just turned on, and achieving the purpose of stably turning on the fast charging path unit 130, thereby improving and optimizing the charging process and charging experience as a whole.

[0051] In one embodiment, the backflow prevention regulating unit 150 is a diode or a MOS tube.

[0052] When the anti-backflow regulating unit 150 uses a diode, the anode of the diode is connected to the first buck module 132 and the second buck module 134 respectively, and the cathode of the diode is connected to the load switch 142 and the charging module 144 respectively.

[0053] In one embodiment, the maximum current output value of the anti-backflow regulating unit 150 is not greater than 1000 mA.

[0054] In one embodiment, the maximum current output value of the anti-backflow regulating unit 150 is 300 mA.

[0055] In one embodiment, the first buck module 132 uses a switched capacitor DC-DC converter.

[0056] In one embodiment, the second step-down module 134 uses a switched capacitor DC-DC converter.

[0057] The structures of the first buck module 132 and the second buck module 134 may be the same or different.

[0058] In one embodiment, the load switch 142 is a diode or a MOS tube.

[0059] In one embodiment, the wireless power receiving unit 110 is a wireless power receiving unit, and the charging module 144 uses a step-down circuit.

[0060] In addition, if Figure 3 As shown, a control method for a charging circuit is also provided. The control method is applied to the above-mentioned charging circuit 100, and the control method includes:

[0061] Step S210, receiving the energy signal transmitted by the external coil through the wireless power receiving unit, generating a corresponding induced voltage signal and sending it to the fast charging path unit and the slow charging path unit respectively.

[0062] Step S220, when the induced voltage signal is less than the first preset voltage threshold, the slow charging path unit is controlled to be turned on to charge the load.

[0063] Step S230: When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow regulating unit is controlled to start.

[0064] Step S240, when the induced voltage signal is greater than a second preset voltage threshold, the fast charging path unit is controlled to be turned on to charge the load, and the second preset voltage threshold is greater than the first preset voltage threshold.

[0065] In addition, an electronic device is also provided. The electronic device is provided with the charging circuit 100 described above.

[0066] In one embodiment, the electronic device is a mobile terminal.

[0067] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow chart, and the combination of boxes in the structure diagram and / or the flow chart, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0068] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0069] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0070] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A charging circuit, characterized in that: The charging circuit includes a wireless power receiving unit, a fast charging path unit and a slow charging path unit connected in parallel between the wireless power receiving unit and the charging output port, and the charging circuit also includes an anti-backflow adjustment unit; The fast charging path unit includes a first step-down module and a second step-down module connected in sequence, the slow charging path unit includes a load switch and a charging module connected in sequence, one end of the anti-backflow regulating unit is respectively connected to the first step-down module and the second step-down module, and the other end of the anti-backflow regulating unit is respectively connected to the load switch and the charging module; The wireless power receiving unit is used to receive the energy signal transmitted by the external coil, generate a corresponding induced voltage signal and send it to the fast charging path unit and the slow charging path unit respectively; When the induced voltage signal is less than a first preset voltage threshold, the slow charging path unit is turned on to charge the load; When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow regulation unit is started, and the first step-down module, the anti-backflow regulation unit and the charging module are used to form a series conduction loop to charge the load; When the induced voltage signal is greater than the second preset voltage threshold, the fast charging path unit is turned on to charge the load, and the second preset voltage threshold is greater than the first preset voltage threshold.

2. The charging circuit according to claim 1, characterized in that: The charging module is also used to shut down after a predetermined time after the fast charging path unit is turned on.

3. The charging circuit according to claim 1, characterized in that: The anti-backflow regulating unit adopts a diode or a MOS tube.

4. The charging circuit according to claim 1, characterized in that: The maximum current output value of the anti-backflow adjustment unit is no more than 1000mA.

5. The charging circuit according to claim 2, characterized in that: The first step-down module adopts a switched capacitor DC-DC converter.

6. The charging circuit according to claim 2, characterized in that: The second step-down module adopts a switched capacitor DC-DC converter.

7. The charging circuit according to claim 2, characterized in that: The load switch adopts a diode or a MOS tube.

8. The charging circuit according to claim 2, characterized in that: The charging module adopts a step-down circuit.

9. A method for controlling a charging circuit, characterized in that: The control method is applied to the charging circuit according to any one of claims 1 to 8, and the control method includes: The wireless power receiving unit receives the energy signal transmitted by the external coil to generate a corresponding induced voltage signal and sends it to the fast charging path unit and the slow charging path unit respectively; When the induced voltage signal is less than a first preset voltage threshold, controlling the slow charging path unit to be turned on to charge the load; When the induced voltage signal is greater than or equal to the first preset voltage threshold and less than the second preset voltage threshold, the anti-backflow regulating unit is controlled to start, so that the first step-down module, the anti-backflow regulating unit and the charging module are used to form a series conduction loop to charge the load; When the induced voltage signal is greater than the second preset voltage threshold, the fast charging path unit is controlled to be turned on to charge the load, and the second preset voltage threshold is greater than the first preset voltage threshold.

10. An electronic device, characterized in that: The electronic device is provided with the charging circuit according to any one of claims 1 to 8.

Images