Wireless charging circuit and terminal equipment

Abstract

The utility model relates to the field of power electronic devices, in particular to a wireless charging circuit and terminal equipment. The circuit comprises a first power switch, a second power switch, a third power switch, a fourth power switch, a voltage conversion module, an energy storage module and a wireless coil module, the input end of the first power switch is used for receiving target power; the output end of the first power switch is connected with the wireless coil module; the input end of the second power switch is connected with the input end of the first power switch, and the output end of the second power switch is connected with the voltage conversion module; the input end of the third power switch is connected with the energy storage module; the output end of the third power switch is connected with the voltage conversion module; the input end of the fourth power switch is connected with the wireless coil module; the output end of the fourth power switch is connected with the energy storage module; the voltage conversion module is connected with the wireless coil module. The wireless charging circuit is used for improving the situation that an existing wireless charging circuit is single in function.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronic devices, especially to a wireless charging circuit and terminal equipment. BACKGROUND

[0002] Wireless charging technology is a kind of technology that transmits electric energy for electronic equipment by non-contact mode, it not only improves the convenience of users, also reduces the use of traditional charging cable, reduces the risk of physical interface damage, therefore, the wireless charging circuit formed by using wireless charging technology is widely used in terminal equipment such as smart phone, smart watch, tablet computer etc. However, the existing wireless charging circuit is only used for receiving wireless electric energy (i.e. wireless charging), it is difficult to be used for wireless reverse charging, therefore, there is the problem of single function. SUMMARY

[0003] The utility model embodiment discloses a wireless charging circuit and terminal equipment for improving the single function of the existing wireless charging circuit.

[0004] The utility model embodiment provides a wireless charging circuit, it includes: first power switch, second power switch, third power switch, fourth power switch, voltage conversion module, energy storage module, wireless coil module;

[0005] The input of first power switch is used for receiving target power supply;The output of first power switch is connected with wireless coil module;

[0006] The input of second power switch is connected with the input of first power switch, and the output of second power switch is connected with voltage conversion module;

[0007] The input of third power switch is connected with energy storage module;The output of third power switch is connected with voltage conversion module;

[0008] The input of fourth power switch is connected with wireless coil module;

[0009] The output of fourth power switch is connected with energy storage module;

[0010] Voltage conversion module is connected with wireless coil module.

[0011] Optionally, it further includes: universal serial bus, load switch, central processing unit;

[0012] The universal serial bus is connected with load switch, is used for connecting with power supply equipment, and receives target power supply transmitted by power supply equipment;

[0013] The central processor is connected with the load switch and the fourth power switch respectively.

[0014] The load switch is connected with the energy storage module, the first power switch, the second power switch, the third power switch and the fourth power switch respectively.

[0015] Optionally, the central processor is provided with a first general input and output interface, a second general input and output interface and a third general input and output interface.

[0016] The first general input and output interface and the third general input and output interface are connected with the load switch respectively.

[0017] The second general input and output interface is connected with the fourth power switch respectively.

[0018] Optionally, the enable terminals of the fourth power switch are connected with the central processor and the load switch respectively.

[0019] Optionally, the enable terminal of the first power switch is connected with the load switch.

[0020] Optionally, the enable terminal of the second power switch is connected with the load switch.

[0021] Optionally, the enable terminal of the third power switch is connected with the load switch.

[0022] Optionally, the energy storage module comprises an electric energy management chip and a battery.

[0023] The electric energy management chip is connected with the load switch, the third power switch and the battery respectively.

[0024] The utility model also provides a terminal equipment, including the circuit as described above.

[0025] From the above technical scheme, the utility model embodiment has following advantages:

[0026] The utility model discloses an embodiment provides a wireless charging circuit, include: first power switch, second power switch, third power switch, fourth power switch, voltage conversion module, energy storage module, wireless coil module, the input of first power switch is used for receiving target power supply, the output of first power switch is connected with wireless coil module, the input of second power switch is connected with the input of first power switch, and the output of second power switch is connected with voltage conversion module, the input of third power switch is connected with energy storage module, the output of third power switch is connected with voltage conversion module, the input of fourth power switch is connected with wireless coil module, the output of fourth power switch is connected with energy storage module, voltage conversion module is connected with wireless coil module.

[0027] In the utility model, the input of fourth power switch is connected with wireless coil module, and the output of fourth power switch module is connected with energy storage module, and the electric energy receiving channel is formed, based on the connection between the output of first power switch, the output of second power switch, the output of third power switch, voltage conversion module, wireless coil module, the electric energy transmitting channel is formed, therefore, in actual use, through setting the on-off state of each power switch, the corresponding channel is started, and is used for carrying out electric energy receiving or electric energy transmitting, and in the embodiment, the input of first power switch and the input of second power switch can be used to receive the target power supply provided by external equipment, and the input of third power switch is used to receive the electric energy provided by energy storage module, thereby providing a variety of electric energy sources for realizing wireless reverse charging, and enriching the use scene of wireless charging circuit.

[0028] Therefore, the wireless charging circuit provided in the embodiment provides a hardware basis for realizing wireless charging and wireless reverse charging, improves the compatibility of the wireless charging circuit, enriches the function of the wireless charging circuit, and avoids the single function of the existing wireless charging circuit. ACCURACY

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0030] Fig. 1 It is the structural schematic diagram of a wireless charging circuit provided in the embodiment of the utility model;

[0031] Figure 2 is another structure schematic view of the wireless charging circuit provided in the embodiment of the present application;

[0032] Figure 3 is a principle schematic view of the wireless charging circuit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0033] The present application provides a wireless charging circuit and terminal device, which is used for improving the single function of the existing wireless charging circuit.

[0034] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0035] In the description of the present application, it should be noted that the terms "front", "back", "up", "down", "two ends", "center", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The relationship terms such as "first", "second" and the like are only used to distinguish one entity from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities.

[0036] Unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] Please refer to Figs. 1-2The utility model embodiment provides a wireless charging circuit one embodiment, including: first power switch 1, second power switch 2, third power switch 3, fourth power switch 4, voltage conversion module 5, energy storage module 6, wireless coil module 7, the input of first power switch 1 is used to receive target power supply, the output of first power switch 1 is connected with wireless coil module 7, the input of second power switch 2 is connected with the input of first power switch 1, and the output of second power switch 2 is connected with voltage conversion module 5, the input of third power switch 3 is connected with energy storage module 6, the output of third power switch 3 is connected with voltage conversion module 5, the input of fourth power switch 4 is connected with wireless coil module 7, the output of fourth power switch 4 is connected with energy storage module 6, voltage conversion module 5 is connected with wireless coil module 7.

[0038] Need to explain, in the embodiment, wireless charging refers to that wireless charging circuit receives the electric energy transmitted by other wireless power transmission equipment and charges energy storage module 6 itself.Wireless reverse charging refers to that wireless charging circuit emits electric energy to external power receiving equipment to charge power receiving equipment.Power receiving equipment refers to equipment that can be used to receive and store the electric energy transmitted by wireless charging circuit.Target power supply refers to the power supply provided by power supply equipment.Power supply equipment refers to equipment that can be used to provide electric energy for wireless charging circuit except energy storage module 6 in wireless charging circuit.Voltage conversion module 5 is used to convert the received voltage into target voltage.Target voltage refers to the voltage required by power receiving equipment.Wireless coil module 7 is used for wireless electric energy transmission.

[0039] When power supply equipment is connected in conduction with the input of first power switch 1 and the input of second power switch 2, then it can be used to provide power supply source for first power switch 1 and second power switch 2.The output of first power switch 1 is connected with wireless coil module 7, the output of second power switch 2 is connected with voltage conversion module 5, voltage conversion module 5 is connected with wireless coil module 7, based on this, the electric transmission channel one from the input of first power switch 1 to the output of first power switch 1 to wireless coil transmission module is constructed, and the electric transmission channel two from the input of second power switch 2 to the output of second power switch 2 to voltage conversion module 5 to wireless coil module 7 is constructed.Therefore, when applied to wireless reverse charging scene, can pass through the conduction first power switch 1, start electric transmission channel one, make wireless coil module 7 emit electric energy to power receiving equipment, or pass through the conduction second power switch 2, start electric transmission channel two, make wireless coil module 7 emit electric energy to power receiving equipment.

[0040] In the embodiment, the input end of the third power switch 3 is connected with the energy storage module 6, the output end of the third power switch 3 is connected with the voltage conversion module 5, and the voltage conversion module 5 is connected with the wireless coil module 7. Based on the connection relationship, a power transmission channel three is constructed from the energy storage module 6 to the input end of the third power switch 3 to the output end of the third power switch 3 to the voltage conversion module 5 to the wireless coil module 7. Therefore, when applied to the wireless reverse charging scene, the third power switch 3 can be turned on, the power transmission channel three is enabled, and the wireless coil module 7 can emit electric energy to the powered device.

[0041] Therefore, the embodiment utilizes the first power switch 1, the second power switch 2, and the third power switch 3 to construct three electric energy transmission channels. When applied to the wireless reverse charging scene, one of the first power switch 1, the second power switch 2, and the third power switch 3 can be selected to be turned on according to the actual charging demand, and wireless electric energy transmission is performed. In an example, the power supply device can be set to have priority over the energy storage module 6 for power supply. When the power supply device is connected, the power supply device is selected as the electric energy source for wireless reverse charging. Based on this, the required power switch to be turned on can be selected according to the voltage of the target power source and the size of the target voltage. For example, when the voltage of the target power source is sufficient to meet the demand of the target voltage, the first power switch 1 can be turned on. When the voltage of the target power source is insufficient to meet the demand of the target voltage, the second power switch 2 can be turned on. When the power supply device is not connected, the third power switch 3 can be turned on, and the electric energy of the energy storage module 6 is used for wireless electric energy transmission.

[0042] In the embodiment, the fourth power switch 4 is used to turn on or turn off the power receiving channel. The input end of the fourth power switch 4 is connected with the wireless coil module 7, and the output end of the fourth power switch 4 is connected with the energy storage module 6. Based on the connection relationship, a power receiving channel is constructed from the wireless coil module 7 to the fourth power switch 4 to the energy storage module 6. When applied to the wireless charging scene, the fourth power switch 4 is turned on, the wireless coil module 7 transmits electric energy to the energy storage module 6 through the power receiving channel, and the energy storage module 6 is charged.

[0043] It can be understood that when applied to the wireless reverse charging scene, the fourth power switch 4 should be turned off to prevent forming a loop. When applied to the wireless charging scene, the first power switch 1, the second power switch 2, and the third power switch 3 should be turned off.

[0044] Therefore, the wireless charging circuit provided by the embodiment provides a hardware basis for realizing wireless charging and wireless reverse charging, improves the compatibility of the wireless charging circuit, provides multiple electric energy transmission channels for realizing wireless reverse charging, enriches the functions and use scenarios of the wireless charging circuit, and avoids the problem that the wireless charging circuit in the prior art is only used for receiving wireless electric energy and is difficult to have wireless reverse charging.

[0045] In one specific embodiment, further comprising: a universal serial bus 8, a load switch 9, a central processing unit 10;

[0046] The universal serial bus 8 is connected with the load switch 9, for connecting with a power supply device, and receiving a target power transmitted by the power supply device;

[0047] The central processing unit 10 is connected with the load switch 9 and the fourth power switch 4 respectively;

[0048] The load switch 9 is connected with the energy storage module 6, the first power switch 1, the second power switch 2, the third power switch 3 and the fourth power switch 4 respectively.

[0049] It should be noted that in the embodiment, one end of the universal serial bus 8 is used for wired connection with the power supply device, and receives the electric energy transmitted by the power supply device. The other end of the universal serial bus 8 is connected with the load switch 9. The load switch 9 is connected with the energy storage module 6, the first power switch 1, the second power switch 2, the third power switch 3 and the fourth power switch 4 respectively, based on which, the embodiment constructs a power transmission channel one from the universal serial bus 8 to the load switch 9 to the first power switch 1 to the wireless coil module 7, a power transmission channel two from the universal serial bus 8 to the load switch 9 to the second power switch 2 to the voltage conversion module 5 to the wireless coil module 7, and a power transmission channel three from the universal serial bus 8 to the load switch 9 to the energy storage module 6. Meanwhile, based on the connection relationship between the energy storage module 6 and the third power switch 3, a power transmission channel four from the energy storage module 6 to the third power switch 3 to the voltage conversion module 5 to the wireless coil module 7 is constructed. Moreover, the fourth power switch 4 is connected to the connection position of the load switch 9 and the wireless coil module 7, based on which a power receiving channel from the wireless coil module 7 to the fourth power switch 4 to the energy storage module 6 is constructed.

[0050] Based on the above-constructed power transmission channels and power receiving channels, the embodiment provides that the wireless charging circuit can be applied to a wireless charging scene, a wireless reverse charging scene and a wired charging scene.

[0051] Specifically, when applied to the wired charging scene, the power supply device is wiredly connected with the universal serial bus 8, and the fourth power switch 4 is turned off, at this time, the power supply device can be used to charge the energy storage module 6 and / or provide electric energy for wireless reverse charging. For example, the power supply device transmits electric energy to the universal serial bus 8, and transmits the electric energy to the energy storage module 6 through the universal serial bus 8 and the load switch 9, at this time, if the first power switch 1 or the second power switch 2 is turned on, the power supply device can transmit the electric energy to the wireless coil module 7, thereby providing electric energy for wireless reverse charging of the wireless coil module 7.

[0052] When the power supply device is not connected, the third power switch 3 can be turned on to enable the fourth power transmission channel to provide a power source for the wireless coil to perform wireless reverse charging.

[0053] Since the wireless coil module 7 can be used to receive the wireless power transmitted by other wireless power transmission devices, when applied to a wireless charging scene, the fourth power switch 4 can be turned on, and the first power switch 1, the second power switch 2, and the third power switch 3 can be turned off to enable the power receiving channel, so that the wireless coil module 7 can transmit the power transmitted by the wireless power transmission device to the energy storage module 6 to charge the energy storage module 6.

[0054] Therefore, the wireless charging circuit provided by the embodiment provides a hardware basis for realizing wireless charging, wireless reverse charging, and wired charging, improves the compatibility of the wireless charging circuit, and provides multiple power transmission channels for realizing wireless reverse charging, enriches the functions and use scenarios of the wireless charging circuit, and avoids the problem that the wireless charging circuit in the prior art can only be used to receive wireless power and cannot realize wireless reverse charging.

[0055] In one example, when the fourth power switch 4 needs to be turned on or turned off, based on the connection relationship between the central processor 10 and the fourth power switch 4, the central processor 10 can output a closing signal or an opening signal to the fourth power switch 4 to turn on or turn off the fourth power switch 4. Alternatively, based on the connection relationship between the load switch 9 and the fourth power switch 4, the load switch 9 can output a closing signal or an opening signal to the fourth power switch 4 to turn on or turn off the fourth power switch 4.

[0056] In one example, based on the connection relationship between the load switch 9 and the enable terminals of the first power switch 1, the second power switch 2, and the third power switch 3, when the first power switch 1 needs to be turned on or turned off, the load switch 9 can output a closing signal or an opening signal to the first power switch 1 to turn on or turn off the first power switch 1, and the same applies to the second power switch 2 and the third power switch 3.

[0057] In one specific embodiment, the central processor 10 is provided with a first general-purpose input / output interface, a second general-purpose input / output interface, and a third general-purpose input / output interface.

[0058] The first general-purpose input / output interface and the third general-purpose input / output interface are connected to the load switch 9, respectively.

[0059] The second general-purpose input / output interface is connected to the fourth power switch 4, respectively.

[0060] In one specific embodiment, the enable terminals of the fourth power switch 4 are connected to the central processor 10 and the load switch 9, respectively.

[0061] In a specific embodiment, the enable terminal of the first power switch 1 is connected with the load switch 9.

[0062] In a specific embodiment, the enable terminal of the second power switch 2 is connected with the load switch 9.

[0063] In a specific embodiment, the enable terminal of the third power switch 3 is connected with the load switch 9.

[0064] It should be noted that the central processing unit 10 is provided with a first general-purpose input / output interface GPIO_0, a second general-purpose input / output interface GPIO_1, and a third general-purpose input / output interface GPIO_2. The first general-purpose input / output interface GPIO_0 is connected with the Flag pin of the load switch 9, the second general-purpose input / output interface GPIO_1 and the RXN pin of the load switch 9 are respectively connected with the enable terminal of the fourth power switch 4. The third general-purpose input / output interface GPIO_2 is connected with the RXN pin of the load switch 9.

[0065] The enable terminal of the first power switch 1, the enable terminal of the second power switch 2, and the enable terminal of the third power switch 3 are respectively connected with the RXN pin of the load switch 9 (not shown in the figure).

[0066] In a specific embodiment, the energy storage module 6 includes an electric energy management chip 61 and a battery 62.

[0067] The electric energy management chip 61 is respectively connected with the load switch 9, the third power switch 3, and the battery 62.

[0068] It should be noted that the input terminal of the third power switch 3 is connected with the electric energy management chip 61

[0069] In a specific embodiment, the universal serial interface 8 includes a tpye-c interface.

[0070] In an application example, the use of the wireless charging circuit provided in the embodiment will be further described in combination with a specific use scenario.

[0071] As shown in FIG. 3, Switch is a load switch, Power Switch A, Power Switch B, Power Switch C, Power Switch D represent the first power switch, the second power switch, the third power switch, the fourth power switch respectively, Charge IC represents the power management chip, BOOST represents the voltage conversion module, Vbus path represents the power transmission channel of the power supply device. RX PATH represents the power receiving channel, TX PATH1 represents the first power transmission channel, TX PATH2 represents the second power transmission channel, TX PATH3 represents the third power transmission channel. VSYS represents the voltage of the energy storage module. WLC represents the wireless coil module. EN represents the enable terminal. IN represents the input terminal, and OUT represents the output terminal.

[0072] When applied to a wireless charging scene, the CPU can be used to open Power Switch A, Power Switch B, Power Switch C to turn off TX PATH1, TX PATH2, TX PATH3, and disconnect the load switch from the external power supply device, close Power Switch D, so that the wireless coil module can normally use RX PATH to wirelessly charge the energy storage module.

[0073] When applied to a wireless reverse charging scene, Vbus path, TX PATH1, TX PATH2 can be used for wireless reverse charging, or TX PATH3 can be used for wireless reverse charging. Among them, when the power supply device is connected to the universal serial interface, TX PATH1 or TX PATH2 can be used for wireless reverse charging. When the power supply device is not connected, TX PATH3 can be used for wireless reverse charging. The channel selection can be made according to actual needs. For example, when the voltage VBUS of the power supply device is greater than 6.5V, Power Switch A is turned on, TX PATH1 is enabled, and the wireless coil module uses VBUS for wireless reverse charging. When the voltage VBUS of the power supply device is less than 6.5V, Power Switch B is turned on, and the voltage conversion module is boosted to output, so that the wireless coil module uses the boosted voltage for wireless reverse charging.

[0074] In another application scenario, the central processor and the load switch can also be functionally configured, so that the load switch has the function of switching the OTG mode and the charging mode. When the device connected to the universal serial interface is a device Device used for data transmission, the central processor outputs an I / O signal to control the load switch to start the OTG mode, and closes RX PATH, TX PATH1, TX PATH2, TX PATH3.

[0075] The utility model also provides a kind of terminal equipment, including the wireless charging circuit as described above.

[0076] Need to be explained, the terminal equipment in the embodiment can be the equipment of supporting wireless power transmission, such as mobile phone, tablet computer etc.

[0077] The above detailed introduction is provided to the wireless charging circuit and terminal equipment of the utility model

[0078] For the general skilled person in the art, according to the idea of the embodiment of the utility model, there will be changes in specific implementation mode and application range, and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A wireless charging circuit, comprising: Comprising: a first power switch, a second power switch, a third power switch, a fourth power switch, a voltage conversion module, an energy storage module, a wireless coil module; an input end of the first power switch is configured to receive a target power supply; an output end of the first power switch is connected with the wireless coil module; an input end of the second power switch is connected with an input end of the first power switch, and an output end of the second power switch is connected with the voltage conversion module; an input end of the third power switch is connected with the energy storage module; an output end of the third power switch is connected with the voltage conversion module; an input end of the fourth power switch is connected with the wireless coil module; an output end of the fourth power switch is connected with the energy storage module; the voltage conversion module is connected with the wireless coil module.

2. The circuit of claim 1, wherein, Further comprising: a universal serial bus, a load switch, a central processing unit; the universal serial bus is connected with the load switch, configured to be connected with a power supply device and receive a target power supply transmitted by the power supply device; the central processing unit is connected with the load switch and the fourth power switch respectively; the load switch is connected with the energy storage module, the first power switch, the second power switch, the third power switch and the fourth power switch respectively.

3. The circuit of claim 2, wherein, the central processing unit is provided with a first universal input / output interface, a second universal input / output interface and a third universal input / output interface; the first universal input / output interface and the third universal input / output interface are connected with the load switch respectively; the second universal input / output interface is connected with the fourth power switch respectively.

4. The circuit of claim 2, wherein, an enable end of the fourth power switch is connected with the central processing unit and the load switch respectively.

5. The circuit of claim 2, wherein, an enable end of the first power switch is connected with the load switch.

6. The circuit of claim 2, wherein, an enable end of the second power switch is connected with the load switch.

7. The circuit of claim 2, wherein, an enable end of the third power switch is connected with the load switch.

8. The circuit of claim 2, wherein, the energy storage module comprises an electric energy management chip and a battery; the electric energy management chip is connected with the load switch, the third power switch and the battery respectively.

9. A terminal device, comprising: comprise the circuit as claimed in any one of claims 1-8.

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