Charging circuit, electronic device and charging method

Abstract

The embodiment of the present application relates to a charging circuit, an electronic device and a charging method, so as to improve the charging power while reducing the preparation cost. The charging circuit includes a conversion module and a charging module group, the input end of the conversion module is respectively connected to the wired power output end and the wireless power output end, and the output end of the conversion module is electrically connected to the input end of the charging module group; when performing wired charging, the conversion module is configured to access the direct current of the wired power output end through the input end, and provide the connected direct current to the charging module group after voltage reduction conversion; and when performing wireless charging, the conversion module is configured to access the direct current of the wireless power output end through the input end, and provide the connected direct current to the charging module group after voltage stabilization conversion; the charging module group is configured to adjust the direct current converted by the conversion module, and provide the adjusted direct current to the rechargeable battery.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of charging technology, and specifically to a charging circuit, an electronic device, and a charging method. Background Art

[0002] With the increasing popularity of wireless charging for portable devices, many portable devices now support both wired charging and wireless charging. In the traditional "wired charging + wireless charging" solution, the wired charging line is directly connected to the charger, and the coil in the wireless charging line is connected to the charger through a rectifier and a step-down Buck converter circuit in turn. The charger converts the wired and wireless charging currents and provides them to the battery. In actual applications, the above traditional "wired charging solution + wireless charging" solution has a low charging power.

[0003] In order to solve the above problems, the prior art usually adopts a solution of connecting multiple Chargers in parallel on the basis of the traditional charging circuit, but the current of the wired charging line will increase accordingly, and it is necessary to customize high-current wires, which increases the cost; or, on the basis of connecting multiple Chargers in parallel, a charge pump Charge Pump is added to the wired charging line to perform two-stage voltage reduction, thereby reducing the current of the wired charging line. Although the wired charging line of this solution can use ordinary wires, the cost will still increase due to the additional addition of the Charge Pump. Summary of the invention

[0004] In order to solve the problems existing in the prior art, at least one embodiment of the present application provides a charging circuit, an electronic device and a charging method, so as to improve the charging power while reducing the preparation cost.

[0005] In a first aspect, the present application provides a charging circuit, comprising a conversion module and a charging module group, wherein the input end of the conversion module is respectively connected to the wired power output end and the wireless power output end, and the output end of the conversion module is electrically connected to the input end of the charging module group;

[0006] When performing wired charging, the conversion module is configured to access the direct current of the output end of the wired power supply through the input end, and provide the connected direct current to the charging module group after performing voltage reduction conversion; and when performing wireless charging, the conversion module is configured to access the direct current of the output end of the wireless power supply through the input end, and provide the connected direct current to the charging module group after performing voltage stabilization conversion;

[0007] The charging module group is configured to adjust the direct current converted by the conversion module and provide the adjusted direct current to the rechargeable battery.

[0008] In a second aspect, the present application provides an electronic device, comprising the charging circuit as described above.

[0009] In a third aspect, the present application provides a charging method, using the charging circuit as described above, comprising:

[0010] When wired charging is performed, the conversion module performs voltage reduction conversion on the DC power connected to the input end and then provides it to the charging module group;

[0011] When wireless charging is performed, the conversion module performs voltage stabilization conversion on the direct current connected to the input end and then provides it to the charging module group;

[0012] The direct current converted by the conversion module is adjusted by the charging module, and the adjusted direct current is provided to the rechargeable battery.

[0013] In the embodiment of the present application, the conversion module is reused for wired charging and wireless charging. The conversion module performs voltage reduction during wired charging, and performs voltage stabilization during wireless charging. While increasing the charging power, both wired and wireless charging lines can use ordinary wires, and there is no need to add an additional voltage reduction IC, such as a Charge Pump, thereby reducing the preparation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 A schematic diagram of a charging circuit provided in an embodiment of the present application;

[0016] Figure 2 A schematic diagram of the structure of the conversion module provided in the embodiment of the present application;

[0017] Figure 3 A schematic diagram of the structure of the switch submodule provided in an embodiment of the present application;

[0018] Figure 4 A schematic diagram of the structure of a first output submodule, a second output submodule and a voltage stabilizing module provided in an embodiment of the present application;

[0019] Figure 5 A schematic diagram of the connection between the first input module, the second input module and the filter module provided in an embodiment of the present application;

[0020] Figure 6A schematic diagram of the structure of a first input module, a second input module and a filter module provided in an embodiment of the present application;

[0021] Figure 7 A schematic diagram of a more specific charging circuit provided in an embodiment of the present application;

[0022] Figure 8 A flowchart of a charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] It should be noted that, in this document, relational terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0025] In order to solve the problem of increased cost when increasing the charging power in the "wired charging + wireless charging" solution in the prior art, the present application provides a charging circuit, an electronic device and a charging method. The charging circuit provided in the present application can be set in a terminal device or an auxiliary device of the terminal. The terminal device may include a mobile phone, a laptop computer, a tablet computer, a smart wearable device and a camera, etc. The auxiliary device may include a power adapter of the terminal device, so that the terminal with "wired charging + wireless charging" capability can increase the charging power at a lower cost.

[0026] like Figure 1 As shown, an embodiment of the present invention provides a charging circuit, comprising a conversion module 1 and a charging module group 2, wherein the input end of the conversion module 1 is respectively connected to the wired power output end and the wireless power output end, and the output end of the conversion module 1 is electrically connected to the input end of the charging module group 2;

[0027] When performing wired charging, the conversion module 1 is configured to access the DC power of the output end of the wired power supply through the input end, and provide the DC power to the charging module group 2 after performing voltage reduction conversion; and when performing wireless charging, the conversion module 1 is configured to access the DC power of the output end of the wireless power supply through the input end, and provide the DC power to the charging module group 2 after performing voltage stabilization conversion;

[0028] The charging module group 2 is configured to adjust the direct current converted by the conversion module 1 and provide the adjusted direct current to the rechargeable battery.

[0029] In the embodiment of the present application, the wired charging and wireless charging multiplexing conversion module 1 is used. During wired charging, the conversion module 1 performs voltage reduction, and during wireless charging, the conversion module 1 performs voltage stabilization. While increasing the charging power, both wired and wireless charging lines can use ordinary wires, and there is no need to add an additional step-down IC, such as a Charge Pump, thereby reducing the preparation cost.

[0030] The conversion module 1 may include a control submodule 11, a switch submodule 12, a first output submodule 13, a second output submodule 14 and a voltage stabilization submodule 15. Figure 2 As shown, the control submodule 11 is electrically connected to the control end of the switch submodule 12, and the input end of the switch submodule 12 serves as the input end of the conversion module 1; one end of the first output submodule 13 and the second output submodule 14 connected in parallel is electrically connected to the output end of the switch submodule 12, and the other end of the parallel connection is electrically connected to the input end of the voltage stabilizing submodule 15; the control submodule 11 is configured to control the output of the switch submodule 12 according to the direct current of wired charging or wireless charging received by the switch submodule 12; the first output submodule 13 is configured to turn on the switch submodule 12 and the voltage stabilizing submodule 15 by itself during wired charging; the second output submodule 14 is configured to turn on the switch submodule 12 and the voltage stabilizing submodule 15 by itself during wireless charging; the voltage stabilizing submodule 15 is configured to form a step-down charge pump with the switch submodule 12 and the first output submodule 13 during wired charging, and to form a Buck converter with the switch submodule 12 and the second output submodule 14 during wireless charging.

[0031] According to the submodules included in the conversion module 1, in the embodiment of the present application, the charging circuit can control the switch submodule 12 through the control submodule 11, and control the output of the switch submodule 12 according to the direct current of wired charging or wireless charging received by the switch submodule 12, so as to realize the selective output of the switch submodule 12 according to the different access of wired charging or wireless charging. During wired charging, the switch submodule 12 and the first output submodule 13 constitute a buck charge pump to step down the voltage of wired charging; during wireless charging, the switch submodule 12 and the second output submodule 14 constitute a Buck converter to stabilize the voltage of wireless charging.

[0032] In possible implementations of the present application, Figure 3As shown, the switch submodule 12 may include a first switch 121, a second switch 122, a third switch 123, a fourth switch 124 and a first capacitor Cfly; the control ends of the first switch 121, the second switch 122, the third switch 123 and the fourth switch 124 are electrically connected to the control submodule 11; the input end of the first switch 121 serves as the input end of the switch submodule 12, and the output end of the first switch 121 is electrically connected to the input end of the second switch 122 and one end of the first capacitor Cfly; the output end of the second switch 122 is electrically connected to the input end of the third switch 123 and serves as the output end of the switch submodule 12; the output end of the third switch 123 is electrically connected to the input end of the fourth switch 124 and the first capacitor C fly The output end of the fourth switch 124 is electrically connected to the common negative terminal. In the embodiment of the present application, the switches included in the switch submodule 12 can have different combinations of on and off according to the control of the control submodule 11, so that the switch submodule 12 has different outputs according to actual control to adapt to wired charging and wireless charging, and forms a step-down charge pump or Buck converter with the first output submodule 13 or the second output submodule 14.

[0033] In possible implementations of the present application, Figure 4 As shown, the first output submodule 13 includes a first output switch 131, and the second output submodule 14 includes an inductor 141 and a second output switch 142; one end of the first output switch 131 is electrically connected to the output end of the switch submodule 12, and the other end is electrically connected to the input end of the voltage stabilizing submodule 15; one end of the inductor 141 is electrically connected to the output end of the switch submodule 12, and the other end is electrically connected to one end of the second output switch 142, and the other end of the second output switch 142 is electrically connected to the input end of the voltage stabilizing submodule 15. In the embodiment of the present application, different output circuits are formed according to the on and off state control of the first output switch 131 and the second output switch 142, so that wired charging and wireless charging can be output in different circuits, and the first output submodule 13 and the switch submodule 12 form a step-down charge pump during wired charging, and the second output submodule 14 and the switch submodule 12 form a Buck converter during wireless charging. The voltage stabilizing submodule 15 may include a voltage stabilizing capacitor C1 , one end of the voltage stabilizing capacitor C1 serves as an input end of the voltage stabilizing submodule 15 , and the other end of the voltage stabilizing capacitor C1 is electrically connected to the common negative end.

[0034] In possible implementations of the present application, Figure 5As shown, the charging circuit may also include a first input module 3, a second input module 4 and a filter module 5; one end of the first input module 3 is used to receive the DC power input by wired charging, and the other end is electrically connected to the input end of the filter module 5 and the input end of the conversion module 1; one end of the second input module 4 is used to receive the DC power input by wireless charging, and the other end is electrically connected to the input end of the filter module 5 and the input end of the conversion module 1; the output end of the filter module 5 is electrically connected to the common negative end; the first input module 3 is configured to conduct itself during wired charging, and provide the received DC power of wired charging to the filter module 5; the second input module 4 is configured to receive the AC power transmitted by the wireless adapter, convert the AC power into DC power and provide it to the filter module 5; the filter module 5 is configured to filter the DC power provided by the first input module 3 or the second input module 4, and provide the filtered DC power to the conversion module 1. In the embodiment of the present application, the charging circuit can provide access to wired charging and wireless charging based on the first input module 3 and the second input module 4. It should be noted that in actual applications, wired charging and wireless charging may be connected at the same time. According to the embodiment of the present application, the charging circuit can be allowed to select wired charging and wireless charging based on the actual environment or other circuits can be used. For example, if it is judged to be safe, wired charging and wireless charging can be allowed to proceed at the same time; for another example, wired charging is given priority and wireless charging is stopped; for another example, wired charging is given priority and wired charging is stopped; for another example, the time for wired charging and wireless charging is allocated; they are not described one by one here. The charging module group 2 included in the charging circuit can be used to make the above judgment or selection, or other circuits outside the charging circuit, which are still within the scope of protection of the present application.

[0035] In possible implementations of the present application, Figure 6 As shown, the first input module 3 includes a first input switch 31, one end of the first input switch 31 receives the direct current input of the wired charging, and the other end is electrically connected to the input end of the filter module 5 and the input end of the conversion module 1; the second input module 4 includes a wireless charging coil 41 and a rectifier circuit 42, the input end of the rectifier circuit 42 is connected to the wireless charging coil 41, and the output end of the rectifier circuit 42 is electrically connected to the input end of the filter module 5 and the input end of the conversion module 1; the filter module 5 includes a filter capacitor C2, one end of the filter capacitor is used as the input end of the filter module, and the other end is used as the output end of the voltage stabilizing submodule 15.

[0036] In possible implementations of the present application, Figure 4As shown, the charging module group 2 includes at least one charging module 21, and the charging module 21 includes a charge pump or a charging integrated circuit chip. For example, the charging module group 2 may include only one charging module 21; or include two or more charging modules 21 connected in parallel. It should be noted that the charging module 21 can be used to control the first input switch 31 in the first input module 3, the first output switch 131 in the first output submodule 13, and the second output switch 142 in the second output submodule 14. Of course, in this case, the charging module 21 has corresponding capabilities, for example, the charging module 21 has an additional control circuit, or the charging module 21 is a charging integrated circuit chip with control capabilities. In practical applications, the charging module 21 can be a charge pump and a Buck converter, and can be composed of additional circuits, which are not described one by one here.

[0037] In the embodiments of the present application, the first switch 121, the second switch 122, the third switch 123 and the fourth switch 124, as well as other switches, may be insulated gate bipolar transistors IGBTs (Insulated Gate Bipolar Transistor), insulated gate field effect transistors MOSs (Metal-Oxide-Semiconductor), or other types of switches that can implement the embodiments of the present application, but the present application is not limited thereto.

[0038] Based on the idea of ​​this application, combined with Figures 1 to 6 Take a more specific charging circuit as an example. Figure 7 The charging circuit includes:

[0039] Switches Q1, Q2, Q3 and Q4 (a first switch 121, a second switch 122, a third switch 123 and a fourth switch 124), and a capacitor Cfly constitute a switch submodule 12;

[0040] The switch SW1 (first output switch 131 ) constitutes the first output submodule 13 ;

[0041] The inductor L and the switch SW2 (the inductor 141 and the second output switch 142 ) form a second output submodule 14 ;

[0042] Capacitor C1 is a voltage stabilizing capacitor of the voltage stabilizing module 15;

[0043] Charge1 and Charge2 (charging module 21 ) constitute charging module group 2 .

[0044] Switch SW3 (first input switch 31), constituting the first input module 3;

[0045] A second input module 4 consisting of a coil RX and a rectifier circuit; and,

[0046] The filter module 5 is composed of capacitor C2.

[0047] according to Figure 7 In the charging circuit shown, when wired charging is performed, switches SW1 and SW3 are turned on, switch SW2 is turned off, and switches Q1, Q2, Q3, Q4, capacitor Cfly and capacitor C1 form a step-down Charge Pump. The DC power of wired charging is filtered by capacitor C1, stepped down by the step-down charge pump, and then provided to the battery by Charger1 and Charger2. For example, the resistance of switches SW1 and SW3 when turned on is 15mΩ to 20mΩ respectively. Assuming that Charge1 and Charge1 output 4V / 8A to charge the battery, the output current of Charge Pump is 4A, and the loss of switch SW1 is P Sw1 =I 2 *R SW1 =4A*4A*15mΩ=0.24W, the Charge Pump output power is The Charge Pump input current is 2A, and the switch SW3 loss is P SW3 =I 2 *R SW3 =2A*2A*20mΩ=0.08W, the input system power of the wired charging line is Therefore, the system efficiency is Therefore, while ensuring the power during wired charging, the current on the wires of the wired charging line is kept at a low level, which can be achieved by using ordinary wires, effectively reducing costs.

[0048] During wireless charging, switches SW1 and SW3 are disconnected, switch SW2 is turned on, and switches Q1, Q2, Q3, Q4, capacitor Cfly, inductor L, and capacitor C1 form a Buck converter. For example, when switch SW2 is turned on, the resistance is 15mΩ. Assuming that the battery is charged at 4V / 4A, the output current of the Buck converter is 2A, and the power loss of switch SW2 is P SW2 =I 2 *R SW1 =2A*2A*15mΩ=0.06W, output power of Buck converter The working efficiency of the Buck converter in the wireless charging state can reach about 95.5%, so the power output of the rectifier circuit is Its DC step-down efficiency The efficiency of synchronous rectifier bridge plus DC filtering is generally around 96%-98%. Here we take the middle value of 97%. The output power required by the wireless RX coil is Because it is the same as wired charging, it is also a high voltage and low current mode, so the wireless coil RX DC loss is small, and the wireless coil RX comprehensive loss can be controlled at about 2%, so the wireless coil RX receiving power is good. The efficiency of the wireless coil receiving power to the battery is Therefore, based on Figure 7 The charging circuit shown can ensure high charging efficiency during wireless charging.

[0049] The embodiment of the present application also provides an electronic device, including the charging circuit as described above. The electronic device may include a mobile phone, a laptop computer, a tablet computer, a smart wearable device, a camera, etc., and the auxiliary device may include a power adapter of the terminal device.

[0050] The present application also provides a charging method, using the charging circuit as described above. Figure 8 As shown, including:

[0051] 801, when performing wired charging, the conversion module steps down the direct current connected to the input end and provides it to the charging module group.

[0052] 802, when wireless charging is performed, the conversion module performs voltage stabilization conversion on the direct current connected to the input end and provides the converted direct current to the charging module group.

[0053] 803, adjusting the direct current converted by the conversion module through the charging module group, and providing the adjusted direct current to the rechargeable battery.

[0054] Obviously, the charging circuit provided in the embodiment of the present application, the wired charging and wireless charging multiplexing conversion module, the conversion module performs voltage reduction during wired charging, and the conversion module performs voltage stabilization during wireless charging. While improving the charging power, both wired and wireless charging lines can use ordinary wires, and there is no need to add an additional step-down IC, such as a ChargePump, thereby reducing the preparation cost.

[0055] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0056] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present application and to form different embodiments.

[0057] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A charging circuit, characterized in that: It includes a conversion module and a charging module group, wherein the input end of the conversion module is respectively connected to the wired power output end and the wireless power output end, and the output end of the conversion module is electrically connected to the input end of the charging module group; When performing wired charging, the conversion module is configured to access the direct current of the output end of the wired power supply through the input end, and provide the connected direct current to the charging module group after performing voltage reduction conversion; and when performing wireless charging, the conversion module is configured to access the direct current of the output end of the wireless power supply through the input end, and provide the connected direct current to the charging module group after performing voltage stabilization conversion; The charging module group is configured to adjust the direct current converted by the conversion module and provide the adjusted direct current to the rechargeable battery; The conversion module includes a control submodule, a switch submodule, a first output submodule, a second output submodule and a voltage stabilization submodule; The control submodule is electrically connected to the control end of the switch submodule, and the input end of the switch submodule serves as the input end of the conversion module; one end of the first output submodule and the second output submodule connected in parallel is electrically connected to the output end of the switch submodule, and the other end of the parallel connection is electrically connected to the input end of the voltage stabilizing submodule; The control submodule is configured to control the output of the switch submodule according to the direct current of wired charging or wireless charging received by the switch submodule; The first output submodule is configured to conduct the switch submodule and the voltage stabilizing submodule by itself during wired charging; the second output submodule is configured to conduct the switch submodule and the voltage stabilizing submodule by itself during wireless charging; The voltage stabilizing submodule is configured to form a step-down charge pump with the switch submodule and the first output submodule during wired charging, and to form a Buck converter with the switch submodule and the second output submodule during wireless charging; The first output submodule includes a first output switch, and the second output submodule includes an inductor and a second output switch; one end of the first output switch is electrically connected to the output end of the switch submodule, and the other end is electrically connected to the input end of the voltage stabilizing submodule; one end of the inductor is electrically connected to the output end of the switch submodule, and the other end is electrically connected to one end of the second output switch, and the other end of the second output switch is electrically connected to the input end of the voltage stabilizing submodule; The voltage stabilizing submodule includes a voltage stabilizing capacitor, one end of the voltage stabilizing capacitor serves as an input end of the voltage stabilizing submodule, and the other end is electrically connected to a common negative end.

2. The charging circuit according to claim 1, characterized in that: The switch submodule includes a first switch, a second switch, a third switch, a fourth switch and a first capacitor; The control ends of the first switch, the second switch, the third switch and the fourth switch are electrically connected to the control submodule; The input end of the first switch serves as the input end of the switch submodule, and the output end of the first switch is electrically connected to the input end of the second switch and one end of the first capacitor; The output end of the second switch is electrically connected to the input end of the third switch and serves as the output end of the switch submodule; The output end of the third switch is electrically connected to the input end of the fourth switch and the other end of the first capacitor; The output terminal of the fourth switch is electrically connected to the common negative terminal.

3. The charging circuit according to claim 1, characterized in that: The charging circuit also includes a first input module, a second input module and a filter module; One end of the first input module is used to receive direct current input by wired charging, and the other end is electrically connected to the input end of the filter module and the input end of the conversion module; One end of the second input module is used to receive the direct current input by the wireless charging, and the other end is electrically connected to the input end of the filtering module and the input end of the conversion module; The output end of the filter module is electrically connected to the common negative end; The first input module is configured to be turned on during wired charging, and provide the received direct current of wired charging to the filtering module; The second input module is configured to receive the alternating current transmitted by the wireless adapter, convert the alternating current into direct current, and then provide it to the filtering module; The filtering module is configured to filter the direct current provided by the first input module or the second input module, and provide the filtered direct current to the conversion module.

4. The charging circuit according to claim 3, characterized in that: The first input module includes a first input switch, one end of which receives the direct current input by the wired charging, and the other end of which is electrically connected to the input end of the filter module and the input end of the conversion module; The second input module includes a wireless charging coil and a rectifier circuit, the input end of the rectifier circuit is connected to the wireless charging coil, and the output end of the rectifier circuit is electrically connected to the input end of the filter module and the input end of the conversion module; The filtering module comprises a filtering capacitor, one end of the filtering capacitor serves as an input end of the filtering module, and the other end of the filtering capacitor serves as an output end of the voltage stabilizing submodule.

5. The charging circuit according to claim 1, characterized in that: The charging module group includes at least one charging module, and the charging module includes a charge pump or a charging integrated circuit chip.

6. An electronic device, characterized in that: The charging circuit comprises the charging circuit as claimed in any one of claims 1 to 5.

7. A charging method, using the charging circuit according to any one of claims 1 to 5, characterized in that: include: When wired charging is performed, the conversion module performs voltage reduction conversion on the DC power connected to the input end and then provides it to the charging module group; When wireless charging is performed, the conversion module performs voltage stabilization conversion on the direct current connected to the input end and then provides it to the charging module group; The direct current converted by the conversion module is adjusted by the charging module, and the adjusted direct current is provided to the rechargeable battery.

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