Wireless charging circuit and power bank
By designing a wireless charging circuit and a power bank, dynamically adjusting the output power and matching the charging protocol, the charging problem of smartwatches in scenarios without power outlets was solved, achieving efficient and safe wireless charging and improving the user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN BASEUS TECH CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-26
Smart Images
Figure CN224289364U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power supply technology, and in particular to a wireless charging circuit and a mobile power supply. Background Technology
[0002] With the widespread adoption of smart wearable devices, smartwatches have become increasingly popular among consumers due to their rich features and convenient user experience. However, smartwatches have limited battery life, often leaving users frustrated by low power when out and about. Currently, charging smartwatches primarily relies on the original magnetic charging cable, which requires connection to a specific power outlet, making it extremely inconvenient in outdoor environments without power outlets. While some universal power banks exist, most cannot directly charge smartwatches. Even those that support wireless charging are not optimized for smartwatch charging, resulting in low charging efficiency and poor compatibility, failing to meet users' needs for charging their smartwatches anytime, anywhere, and causing considerable inconvenience. Utility Model Content
[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a wireless charging circuit and a power bank, which provides a convenient and fast wireless charging method for devices such as smartwatches, can improve wireless charging efficiency, ensure the safety and stability of the power bank in different usage scenarios, and enhance the user experience.
[0004] A wireless charging circuit according to a first aspect of the present invention includes a power management module, a buck-boost module, a wireless charging module, and a control module. The power management module is electrically connected to both the buck-boost module and the control module. The buck-boost module is also electrically connected to both the wireless charging module and the control module. The control module includes a power regulation unit and a voltage sampling unit. The power regulation unit is electrically connected to the wireless charging module, and the voltage sampling unit is electrically connected to a battery. The control module is configured to: when the voltage sampling unit detects that the battery operating voltage is in a first voltage range, the power regulation unit outputs a first power regulation signal to control the wireless charging module to output a first power; when the voltage sampling unit detects that the battery operating voltage is in a second voltage range, the power regulation unit outputs a second power regulation signal to control the wireless charging module to output a second power.
[0005] According to some embodiments of the present invention, a charging interface module is also included. The charging interface module is electrically connected to the power management module. The control module is configured such that when the power management module detects that the charging interface module is connected to the device to be charged, the power adjustment unit outputs a third power adjustment signal to control the wireless charging module to output a third power.
[0006] According to some embodiments of the present invention, the control module further includes a charging indicator unit, which is electrically connected to the wireless charging module. The control module is configured to: when the charging indicator unit receives a first status signal output by the wireless charging module, control the power management module to stop outputting power; when the charging indicator unit receives a second status signal output by the wireless charging module, control the power management module to continuously output power.
[0007] According to some embodiments of this utility model, it further includes a protocol switching module, which is electrically connected to the wireless charging module and the wireless charging transmitting coil respectively. The wireless charging module is electrically connected to the wireless charging transmitting coil. The wireless charging module controls the protocol switching module to switch the resonant frequency to match the operating frequency of the wireless charging transmitting coil.
[0008] According to some embodiments of the present invention, the protocol switching module includes a first resonant unit and a second resonant unit, and the wireless charging transmitting coil is electrically connected to the first resonant unit and the second resonant unit respectively.
[0009] According to some embodiments of the present invention, the power management module includes a battery voltage input terminal and a battery connection unit, wherein the input terminal of the battery connection unit is electrically connected to the battery voltage input terminal, and the output terminal of the battery connection unit is configured as a battery connection terminal.
[0010] According to some embodiments of this utility model, it also includes a power consumption detection module, which is electrically connected to the battery connection terminal and the wireless charging module respectively.
[0011] According to some embodiments of this utility model, it further includes a battery protection module, which includes a positive terminal and a negative terminal. The positive terminal is electrically connected to the positive terminal of the battery and the battery voltage input terminal, respectively, and the negative terminal is electrically connected to the negative terminal of the battery.
[0012] According to some embodiments of the present invention, it further includes a display module and a button module, wherein the button module is electrically connected to the power management module and the control module respectively, and the display module is electrically connected to the power management module and the control module respectively.
[0013] According to a second aspect of the present invention, a portable power bank includes a housing, a battery, a wireless charging transmitting coil, a circuit board, and the wireless charging circuit described in the first aspect. The surface of the housing is provided with a wireless charging area, the shape of which matches the outline of the device to be charged. The wireless charging circuit is disposed on the circuit board. The battery, the wireless charging transmitting coil, and the circuit board are disposed within the cavity of the housing, and the wireless charging transmitting coil is disposed below the wireless charging area.
[0014] The wireless charging circuit and power bank provided according to the embodiments of this utility model have at least the following beneficial effects:
[0015] In this embodiment of the wireless charging circuit, there are a power management module, a buck-boost module, a wireless charging module, and a control module. The power management module is electrically connected to both the buck-boost module and the control module. The buck-boost module is also electrically connected to both the wireless charging module and the control module. The control module includes a power regulation unit and a voltage sampling unit. The power regulation unit is electrically connected to the wireless charging module, and the voltage sampling unit is electrically connected to the battery. The control module is configured such that: when the voltage sampling unit detects that the battery operating voltage is in a first voltage range, the power regulation unit outputs a first power regulation signal to control the wireless charging module to output a first power; when the voltage sampling unit detects that the battery operating voltage is in a second voltage range, the power regulation unit outputs a second power regulation signal to control the wireless charging module to output a second power. This embodiment of the wireless charging circuit and power bank obtains power from a connected battery through the power management module and regulates the voltage through the buck-boost module. The regulated voltage is then transmitted to the wireless charging module, which uses electromagnetic induction to transfer power to the device being charged. This provides a convenient and fast wireless charging method for devices such as smartwatches in outdoor environments where there are no power outlets, improving wireless charging efficiency and addressing the battery anxiety issue of smartwatches. Meanwhile, the voltage sampling unit of the control module continuously monitors the battery voltage, and the power adjustment unit dynamically adjusts the output power according to the device requirements, realizing the voltage segmented power limiting function, ensuring the safety and stability of the power bank in different usage scenarios, and improving the user experience.
[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description
[0017] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.
[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0019] Figure 1 This is a functional block diagram of the wireless charging circuit according to an embodiment of the present utility model;
[0020] Figure 2 This is a circuit diagram of the power management module according to an embodiment of the present invention;
[0021] Figure 3 This is a circuit diagram of the control module according to an embodiment of the present invention;
[0022] Figure 4 This is a circuit diagram of the buck-boost module according to an embodiment of the present invention;
[0023] Figure 5 This is a circuit diagram of the wireless charging module according to an embodiment of the present utility model;
[0024] Figure 6 This is a circuit diagram of the power regulation unit according to an embodiment of the present invention;
[0025] Figure 7 This is a circuit diagram of the charging indicator unit according to an embodiment of the present utility model;
[0026] Figure 8 This is a circuit diagram of the temperature detection unit according to an embodiment of the present invention;
[0027] Figure 9 This is a circuit diagram of the electrostatic protection unit according to an embodiment of the present invention;
[0028] Figure 10 This is a circuit diagram of the protocol switching module according to an embodiment of the present invention;
[0029] Figure 11 This is a circuit diagram of the battery connection unit according to an embodiment of the present invention;
[0030] Figure 12 This is a circuit diagram of the power consumption detection module according to an embodiment of the present invention;
[0031] Figure 13 This is a circuit diagram of the battery protection module according to an embodiment of the present invention;
[0032] Figure 14 This is a circuit diagram of the button module according to an embodiment of the present utility model;
[0033] Figure 15 This is a circuit diagram of the display module according to an embodiment of the present utility model;
[0034] Figure 16 This is a circuit diagram of the decoding module according to an embodiment of the present invention. Detailed Implementation
[0035] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0037] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0039] With the widespread adoption of smart wearable devices, smartwatches have become increasingly popular among consumers due to their rich features and convenient user experience. However, smartwatches have limited battery life, often leaving users frustrated by low power when out and about. Currently, charging smartwatches primarily relies on the original magnetic charging cable, which requires connection to a specific power outlet, making it extremely inconvenient in outdoor environments without power outlets. While some universal power banks exist, most cannot directly charge smartwatches. Even those that support wireless charging are not optimized for smartwatch charging, resulting in low charging efficiency and poor compatibility, failing to meet users' needs for charging their smartwatches anytime, anywhere, and causing considerable inconvenience.
[0040] Based on this, the present invention provides a wireless charging circuit and a power bank, which provide a convenient and fast wireless charging method for devices such as smartwatches, improve wireless charging efficiency, ensure the safety and stability of the power bank in different usage scenarios, and enhance the user experience.
[0041] The embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0042] Reference Figure 1 The first aspect of this utility model provides a wireless charging circuit, including a power management module, a buck-boost module, a wireless charging module, and a control module. The power management module is electrically connected to both the buck-boost module and the control module. The buck-boost module is also electrically connected to both the wireless charging module and the control module. The control module includes a power regulation unit and a voltage sampling unit. The power regulation unit is electrically connected to the wireless charging module, and the voltage sampling unit is electrically connected to a battery. The control module is configured to: when the voltage sampling unit detects that the battery operating voltage is within a first voltage range, the power regulation unit outputs a first power regulation signal to control the wireless charging module to output a first power; when the voltage sampling unit detects that the battery operating voltage is within a second voltage range, the power regulation unit outputs a second power regulation signal to control the wireless charging module to output a second power.
[0043] In some embodiments, such as Figure 2 and Figure 3As shown, the power management module includes resistor 10, resistor R23, capacitors C9, C57, C59, and C61, inductor L5, and chip U8 (IP5316). The control module includes resistors R102, R103, R104, R106, R108, R110, R115, and R119, capacitors C69 and C70, diodes E2 and E3, and the main control chip U9 (RX6156M). The voltage sampling unit includes... Resistors R98 and R101, capacitor C64, and one end of inductor L5 are connected to pin 9 of chip U8 and the other end to one end of resistor R10, with the connection point to the battery being VBAT. One end of capacitor C59 and one end of resistor R98 are connected to connection point VBAT. The other end of resistor R98 is connected to one end of resistor R101 and one end of resistor C64, with the connection point being BAT_Det. Pin 18 of chip U9 is connected to connection point BAT_Det. The other ends of resistor R101 and resistor C64 are grounded. Simultaneously, the other end of resistor R10 is connected to pin 8 of chip U8 and one end of capacitor C61. Pin 6 of chip U8 is connected to one end of resistor R23, with the connection point being IRQ. The other ends of resistor R23, capacitor C61, and capacitor C59 are grounded. Furthermore, pin 10 of chip U8 is connected to one end of capacitor C9, with the connection point being VOUT, for providing power output. One end of capacitor C57 is connected to connection point VOUT, and the other ends of capacitors C9 and C57 are respectively connected to ground. Pin 9 of chip U9 is connected to one end of resistor R108, and the other end of resistor R108 is connected to connection point VOUT. Pin 13 of chip U9 is connected to one end of resistor R106, and the other end of resistor R106 is connected to one end of resistor R103, with the connection point being SDA. Pin 5 of chip U8 is connected to connection point SDA. Simultaneously, pin 14 of chip U9 is connected to one end of resistor R104, and the other end of resistor R104 is connected to one end of resistor R102, with the connection point being SCL. Pin 4 of chip U8 is connected to connection point SCL, and the other end of resistor R102 is connected to the other end of resistor R103. Pin 16 of chip U9 is connected to connection point IRQ.
[0044] In some embodiments, such as Figure 3 and Figure 4As shown, the step-up / step-down module includes resistors R2, R3, R6, R9, R11, R100, and R107, capacitors C7, C8, C10, C12, C62, C63, and C68, inductors L1 and L6, diode D9, and chip U2. Pin 1 of chip U2 is connected to one end of inductor L6, one end of resistor R100, and the anode of diode D9, respectively. The other end of inductor L6 is connected to one end of capacitor C10, one end of capacitor C63, and pin 3 of inductor L1, respectively. Pin 2 of inductor L1 is connected to connection point VOUT. Pins 1 and 4 of inductor L1, as well as the other ends of capacitors C10 and C63, are connected to ground, respectively. Furthermore, pin 2 of chip U2 is connected to ground; pin 3 of chip U2 is connected to one end of resistor R2, one end of resistor R3, and one end of resistor R6 respectively; the other end of resistor R6 is connected to one end of resistor R9 and one end of capacitor C68 respectively; the other end of resistor R9 is connected to pin 20 of chip U11; the other end of capacitor C68 is connected to ground; pin 4 of chip U2 is connected to one end of resistor R107; the other end of resistor R107 is connected to the connection point of pin 9 of chip U9 and resistor R108; one end of resistor R11 is connected to pin 5 of chip U2, and the other end is connected to ground; pin 6 of chip U2 is connected to the other end of resistor R2, one end of capacitor C7, one end of capacitor C8, one end of capacitor C12, and the cathode of diode D9 respectively; the other ends of capacitor C7, capacitor C8, and capacitor C12 are connected to ground; one end of capacitor C62 is connected to the other end of resistor R100, and the other end is connected to ground.
[0045] In some embodiments, such as Figure 5 and Figure 6 As shown, the wireless charging module includes chip U11, model number SC96015A. The power adjustment unit includes resistors R109 and R144. Pin 10 of the main control chip U9 is connected to one end of resistor R109, and the other end of resistor R109 is connected to pin 2 of chip U11. The connection point is GP4. One end of resistor R144 is connected to connection point A, and the other end is connected to ground.
[0046] In some embodiments, such as Figure 3 and Figure 8 As shown, the control module also includes a temperature detection unit, which includes a resistor R99, a capacitor C65, and a thermistor NTC1. One end of the resistor R99 is connected to pin 5 of the chip U9, and the other end is connected to one end of the thermistor NTC1. One end of the capacitor C65 is connected to the connection point of the resistor R99 and the thermistor NTC1, as well as pin 17 of the chip U9. The other end of the capacitor C65 and the other end of the thermistor NTC1 are connected to ground.
[0047] In some embodiments, such as Figure 2 and Figure 9 As shown, the power management module also includes an electrostatic discharge (ESD) protection unit to prevent ESD damage to the circuit. The ESD protection unit includes a resistor R29, a capacitor C66, and a diode E1. Pin 3 of the chip U8 is connected to one end of the resistor R29, and the other end of the resistor R29 is connected to the anode of the diode E1 and one end of the capacitor C66, respectively. The cathode of the diode E1 and the other end of the capacitor C66 are connected to ground.
[0048] In some embodiments, such as Figure 3 As shown, one end of resistor R110 is connected to connection point VBAT, and the other end is connected to one end of capacitor C69, with the connection point being VDD. Pin 6 of chip U9 and one end of capacitor C70 are connected to connection point VDD, while the other ends of capacitors C69 and C70 are connected to ground. Simultaneously, pin 7 of chip U9 is connected to one end of resistor R119, and the other end of resistor R119 is connected to the anode of diode E2. Pin 8 of chip U9 is connected to one end of resistor R115, and the other end of resistor R115 is connected to the anode of diode E3. The cathodes of diodes E2 and E3 are connected to ground.
[0049] Understandably, the battery voltage is input to pin 9 of chip U8 via connection point VBAT, inductor L5, and resistor R10. Resistors R98 and R101 form a voltage divider circuit, dividing the battery voltage at connection point VBAT and inputting it to pin 18 of chip U9 (connection point BAT_Det). Simultaneously, capacitor C64 filters out high-frequency noise in the voltage divider circuit, ensuring a stable voltage signal input to chip U9. Further, chip U9 determines the battery's operating voltage range based on the voltage signal at connection point BAT_Det. When the battery operating voltage is in the first voltage range, for example, 3.8V-4.25V, chip U9 outputs a first power adjustment signal (high-level signal) through pin 10, which is transmitted to pin 2 of chip U11 (connection point GP4) via resistor R109. This controls the wireless charging module to output a first power, for example, 5W, maintaining the wireless charging output power at the set fast charging power of 5W. Additionally, when the battery operating voltage is in the second voltage range, for example, the second voltage range can be 3.0V-3.8V, chip U9 outputs a second power regulation signal (low-level signal), which is also transmitted to pin 2 of chip U11 through resistor R109 to control the wireless charging module to output a second power, for example, to control the second power output of the wireless charging module to be 2.5W, automatically reducing the wireless charging output power to 2.5W to ensure the efficiency and safety of the charging process.
[0050] The wireless charging circuit provided by this utility model obtains electrical energy from a connected battery power source through a power management module, and adjusts the voltage through a buck-boost module. The adjusted voltage is then delivered to the wireless charging module, which uses electromagnetic induction to transmit electrical energy to the device being charged. This provides a convenient and fast wireless charging method for devices such as smartwatches in outdoor or other scenarios without power outlets, improving wireless charging efficiency and addressing battery anxiety for smartwatches. Simultaneously, the voltage sampling unit of the control module continuously monitors the battery voltage, and the power adjustment unit dynamically adjusts the output power according to device needs, achieving voltage-segmented power limiting. This ensures the safety and stability of the power bank in different usage scenarios, enhancing the user experience.
[0051] In some embodiments of the present invention, the wireless charging circuit also includes a charging interface module, which is electrically connected to the power management module. The control module is configured such that when the power management module detects that the charging interface module is connected to the device to be charged, the power adjustment unit outputs a third power adjustment signal to control the wireless charging module to output a third power.
[0052] In some embodiments, such as Figure 2 and Figure 3 As shown, the charging interface module includes a USB-C interface JK1, and the power management module includes resistors R8 and R21, capacitors C58 and C60, and diode D4. Pin 1 of the USB-C interface JK1 is connected to the cathode of diode D4 at connection point VBUS1, which provides external power input to the circuit. One end of resistor R8, one end of capacitor C58, and pin 1 of chip U8 are connected to connection point VBUS1. Further, the other end of resistor R8 is connected to one end of capacitor C60, and pin 5 of the USB-C interface JK1 is connected to one end of resistor R21. The other end of resistor R21, the anode of diode D4, the other end of capacitor C60, the other end of capacitor C58, and pin 11 of chip U8 are connected to ground. Further, the control module includes resistor R105 and capacitor C67. One end of resistor R105 is connected to the connection point VBUS2 between resistor R21 and diode D4, and the other end is connected to pin 2 of chip U9 and one end of capacitor C67. The other end of capacitor C67 is connected to ground.
[0053] Understandably, the power management module detects whether a device is connected via pin 1 (CC_IN) of the USB-C interface JK1. When a device connection is detected, the power regulation unit of the control module outputs a third power regulation signal, which in turn controls the wireless charging module to output a third power. Furthermore, when a device connection is detected, the power regulation unit of the control module outputs a third power regulation signal, which in turn controls the wireless charging module to output a third power. For example, the output power of the wireless charging module can be reduced to 1W or lower, without affecting the wired charging of the device connected to the USB-C interface. This achieves stable and continuous output from the wireless charging module, simultaneously meeting the charging needs of both wired and wireless charging devices.
[0054] In some embodiments of the wireless charging circuit provided by this utility model, the control module further includes a charging indicator unit, which is electrically connected to the wireless charging module. The control module is configured to: when the charging indicator unit receives a first status signal output by the wireless charging module, control the power management module to stop outputting power; when the charging indicator unit receives a second status signal output by the wireless charging module, control the power management module to continuously output power.
[0055] In some embodiments, such as Figure 3 and Figure 7 As shown, the charging indicator unit includes resistors R120 and R125. Pin 11 of the main control chip U9 is connected to one end of resistor R120, and the other end of resistor R120 is connected to pin 4 of chip U11, with the connection point being GP5. One end of resistor R125 is connected to connection point A, and the other end is connected to ground. It can be understood that when the wireless charging module completes charging and outputs a first status signal (such as a low-level signal) to the GP5 connection point of the charging indicator unit, the main control chip U9 detects this signal through resistor R120 and then controls the power management module to stop supplying power, indicating that the device is fully charged. If the wireless charging module is still charging and outputs a second status signal (such as a high-level signal) to the charging indicator unit, the main control chip U9 detects this signal through resistor R120 and controls the power management module to continue supplying power, ensuring that the charging process is not affected.
[0056] In some embodiments of the wireless charging circuit provided by this utility model, a protocol switching module is also included. The protocol switching module is electrically connected to both the wireless charging module and the wireless charging transmitting coil. The wireless charging module is electrically connected to the wireless charging transmitting coil. The wireless charging module controls the protocol switching module to switch the resonant frequency to match the operating frequency of the wireless charging transmitting coil. It can be understood that the wireless charging module achieves dynamic adjustment of the resonant frequency through the protocol switching module, ensuring matching with the operating frequency of the wireless charging transmitting coil. This not only improves the efficiency and compatibility of wireless charging but also ensures that the device can charge stably and efficiently under different charging protocols.
[0057] In some embodiments, such as Figure 5 As shown, the wireless charging module also includes resistors R18, R19, R27, R28, R30, R31, R32, and R127, capacitors C6, C75, C76, C77, C78, C85, C86, and C87, a diode D10, and an inductor L8. One end of capacitor C85 is connected to pin 14 of chip U11, and the other end is connected to one end of resistor R31 and one end of capacitor C87. The other end of capacitor C87 is connected to ground. The other end of resistor R31 is connected to one end of resistor R30, one end of resistor R32, and one end of capacitor C86. The other end of resistor R30 is connected to the cathode of diode D10. The other end of capacitor C86 and the other end of resistor R32 are connected to ground. The anode of diode D10 is connected to the wireless charging transmitting coil VCOIL.
[0058] Furthermore, such as Figure 5 As shown, pin 15 of chip U11 is connected to one end of resistor R27 and one end of resistor R28 respectively. The other end of resistor R28 is connected to ground, and the other end of resistor R27 is connected to the wireless charging transmitter coil VCOIL.
[0059] Furthermore, such as Figure 5 As shown, pin 16 of chip U11 is connected to one end of resistor R19 and one end of capacitor C78, respectively. The other end of resistor R19 is connected to one end of capacitor C76. Pin 17 of chip U11 is connected to the other end of capacitor C78. Pin 18 of chip U11 is connected to one end of capacitor C77, one end of resistor R18, and one end of inductor L8, respectively. The other end of resistor R18 is connected to one end of capacitor C75. The other end of inductor L8 and one end of resistor R127 are connected to the wireless charging transmitter coil VCOIL. One end of resistor R127 is connected to one end of capacitor C6. Pin 19 of chip U11 is connected to the other end of capacitor C77. The other ends of capacitors C6, C75, and C76 are connected to ground.
[0060] Understandably, chip U11 is connected to the line charging transmitter coil VCOIL via pins 14 and 15 respectively. By receiving voltage and current signals from VCOIL, it can monitor the charging status of the device in real time. Specifically, when the device is fully charged, it will feed back a current signal. If chip U11 detects that the feedback current signal has not changed after multiple detections, it will determine that the device is fully charged and thus reduce the output current. When the device is fully charged, it will feed back a voltage signal. If chip U11 detects that the device is fully charged, it will reduce the output power.
[0061] In some embodiments, such as Figure 5 and Figure 10 As shown, the protocol switching module includes resistors R12, R13, R14, R15, R16, and R17; capacitors C3, C4, and C91; diodes D1 and Q2; transistors Q1 and Q2; and a field-effect transistor (FET) Q14. FET Q14 is a dual NMOS transistor, model VS3622. Pin D1 of FET Q14 is connected to pin 16 of chip U11. Pins S1 and S2 of FET Q14 are connected to one end of capacitor C3, one end of diode D11, and one end of resistor R12, respectively. Pins G1 and G2 of FET Q14 are connected to the other end of capacitor C3, the other end of diode D11, the other end of resistor R12, and resistor R15, respectively. One end of resistor R15 is connected to the collector of transistor Q1. One end of resistor R16, one end of capacitor C91, one end of capacitor C4, and the cathode of diode D1 are connected to the emitter of transistor Q1. The other end of capacitor C4 is connected to pin 16 of chip U11. The anode of diode D1 is connected to the connection point VDD. The other end of resistor R16, the other end of capacitor C91, and one end of resistor R17 are connected to the base of transistor Q1. The other end of resistor R17 is connected to the collector of transistor Q2. One end of resistor R13 and one end of resistor R14 are connected to the base of transistor Q2. The other end of resistor R13 is connected to pin 21 of chip U11. The other end of resistor R14 is connected to the emitter of transistor Q2 and ground. It should be noted that the protocol switching module ensures that the wireless charging module is compatible with multiple charging protocols. The wireless charging module controls the protocol switching module to adjust the resonant frequency through pins 16 (SW1) and 21 (SC1) of chip U11 to match the operating frequency of the wireless charging transmitting coil, thereby improving the efficiency of wireless charging.
[0062] Reference Figure 10 In some embodiments of the present invention, the wireless charging circuit includes a protocol switching module comprising a first resonant unit and a second resonant unit, and a wireless charging transmitting coil is electrically connected to the first resonant unit and the second resonant unit respectively.
[0063] In some embodiments, such as Figure 10 As shown, the first resonant unit includes capacitors C5 and C11. One end of capacitor C5 and one end of capacitor C11 are connected to pin D1 of the field-effect transistor Q14, and the other ends of capacitors C5 and C11 are connected to the wireless charging transmitting coil VCOIL. Further, the second resonant unit includes capacitors C88 and C89. One end of capacitor C88 and one end of capacitor C89 are connected to pin D2 of the field-effect transistor Q14, and the other ends of capacitors C88 and C89 are connected to the wireless charging transmitting coil VCOIL. It can be understood that the wireless charging module adjusts the resonant frequency through the protocol switching module controlled by chip U11, switching different resonant capacitors in the first and second resonant units to match the operating frequency of the wireless charging transmitting coil and improve the efficiency of wireless charging.
[0064] In some embodiments of the present invention, the power management module includes a battery voltage input terminal and a battery connection unit. The input terminal of the battery connection unit is electrically connected to the battery voltage input terminal, and the output terminal of the battery connection unit is configured as the battery connection terminal.
[0065] In some embodiments, such as Figure 2 and Figure 11 As shown, connection point VBAT is the battery voltage input terminal. The battery connection unit includes resistor R124. One end of resistor R124, which is the input terminal of the battery connection unit, is connected to connection point VBAT. The other end of resistor R124, which is the output terminal of the battery connection unit, is configured as battery connection terminal BATT to provide power input to other modules of the circuit.
[0066] In some embodiments of the present invention, the wireless charging circuit also includes a power consumption detection module, which is electrically connected to the battery connection terminal and the wireless charging module respectively.
[0067] In some embodiments, such as Figure 5 , Figure 11 and Figure 12As shown, the power consumption detection module includes resistor R126, capacitors C71 and C72, diode D7, inductor L7, and chip U10, which is model IP2501. Specifically, pins 1 and 5 of chip U10 are connected to one end of capacitor C72 and the anode of diode D7, with the connection point at VCC 5V. The cathode of diode D7 is connected to pins 1 and 5 of chip U10, meaning the output of the power consumption detection module is VCC 12V. Further, pin 2 of chip U10 is connected to ground, pin 3 of chip U10 is connected to one end of resistor R126, and pin 4 of chip U10 is connected to the other end of resistor R126, one end of capacitor C71, one end of inductor L7, and the battery connection terminal BATT. The other end of capacitor C71 is connected to ground.
[0068] Understandably, the battery voltage is input to input pin 4 of chip U10 via BATT, and chip U10 outputs power to VCC12V via output pin 1 to provide power input for the wireless charging module. At the same time, capacitors C71 and C72 are used to filter out high-frequency noise in the power supply to ensure that chip U10 receives a stable power supply.
[0069] In some embodiments of the present invention, the wireless charging circuit also includes a battery protection module. The battery protection module includes a positive terminal and a negative terminal. The positive terminal is electrically connected to the positive terminal of the battery and the battery voltage input terminal, respectively, and the negative terminal is electrically connected to the negative terminal of the battery.
[0070] In some embodiments, such as Figure 13 As shown, the battery protection module also includes a resistor R130, a capacitor C92, and a chip U13, model XB4957I. Specifically, pin 1 of chip U13 is connected to one end of resistor R130 and one end of capacitor C92, respectively. The other end of resistor R130 is connected to the positive terminal, thus connecting to the positive terminal of the battery. Further, pin 2 of chip U13 is connected to the other end of capacitor C92 and the negative terminal, respectively, thus connecting to the negative terminal of the battery. Pins 3 and 4 of chip U13 are connected to ground.
[0071] Understandably, capacitor C92 is used to filter out high-frequency noise in the power supply, ensuring a stable power supply for chip U13. Chip U13 then monitors the battery voltage in real time, ensuring the battery operates within a safe voltage range. Specifically, when the battery voltage reaches the overcharge threshold (e.g., 4.3V ± 50mV), the protection circuit inside chip U13 is triggered, cutting off the charging path to prevent overcharging. Conversely, when the battery voltage drops to the over-discharge threshold (e.g., 2.8V ± 100mV), the protection circuit inside chip U13 is triggered, cutting off the discharge path to prevent over-discharge, thereby extending battery life and improving circuit reliability.
[0072] In some embodiments of the present invention, the wireless charging circuit further includes a display module and a button module. The button module is electrically connected to the power management module and the control module, respectively, and the display module is electrically connected to the power management module and the control module, respectively.
[0073] Understandably, the button module is electrically connected to the power management module and the control module respectively to realize the control function of the power bank. It is used for power switch and for switching charging modes. Users can perform different operations to switch charging modes according to actual needs. For example, a short press can activate wireless charging, a long press can turn off wireless charging, and a double press can turn off power output.
[0074] In some embodiments, such as Figure 2 , Figure 3 and Figure 14 As shown, the button module includes resistors R7, R20, and R26, button SW1, and field-effect transistor Q3. Specifically, the drain of field-effect transistor Q3, one end of resistor R7, and one end of resistor R20 are connected to pin 7 of chip U8, at connection point KEY, enabling electrical connection between the button module and the power management module. The state of the output signal (high or low level) is controlled by button KEY, sending control signals to the power management module. The gate of field-effect transistor Q3 and one end of resistor R26 are connected to pin 4 of chip U9, at connection point SW, enabling electrical connection between the button module and the control module, sending control signals to the control module. The other end of resistor R7 is connected to pin 1 of button SW1. Pin 2 of button SW1, the other end of resistor R20, the source of field-effect transistor Q3, and the other end of resistor R26 are connected to ground.
[0075] Understandably, the display module is equipped with LED display strips of different colors, which can display information such as the remaining power of the power bank, the current charging status (such as charging, fully charged, etc.), and charging current and voltage in real time.
[0076] In some embodiments, such as Figure 2 , Figure 3 and Figure 15As shown, the display module includes resistors R111, R112, R113, R116, R117, R118, R121, R122, R123, LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, transistors Q4, Q12, and Q13. Specifically, pin 1 of transistor Q4 is connected to one end of resistor R116 and one end of resistor R121, respectively. The other end of resistor R116 is connected to pin 1 of chip U9. The other end of resistor R121 is connected to pin 2 of transistor Q4 and ground. Pin 3 of transistor Q4 is connected to one end of resistor R111. The other end of resistor R111 is connected to the cathodes of LED1, LED4, and LED7, respectively. The anodes of LED1, LED4, and LED7 are connected to pin 10 of chip U8, forming the first LED group. Then, the display module is electrically connected to the power management module through connection point VOUT.
[0077] Furthermore, pin 1 of transistor Q12 is connected to one end of resistor R117 and one end of resistor R122 respectively. The other end of resistor R117 is connected to pin 20 of chip U9. The other end of resistor R122 is connected to pin 2 of transistor Q12 and ground. Pin 3 of transistor Q12 is connected to one end of resistor R112. The other end of resistor R112 is connected to the cathodes of LED2, LED5, and LED8 respectively. The anodes of LED2, LED5, and LED8 are connected to connection point VOUT to form the second LED group.
[0078] Furthermore, pin 1 of transistor Q13 is connected to one end of resistor R118 and one end of resistor R123 respectively. The other end of resistor R118 is connected to pin 19 of chip U9. The other end of resistor R123 is connected to pin 2 of transistor Q13 and ground. Pin 3 of transistor Q13 is connected to one end of resistor R113. The other end of resistor R113 is connected to the cathodes of LED3, LED6 and LED9 respectively. The anodes of LED3, LED6 and LED9 are connected to connection point VOUT to form the third LED group.
[0079] It should be noted that VOUT provides power to the LED light group of the display module. The control module sends control signals (such as high-level and low-level signals) through chip U9 to control the LED light group to turn on and off, thereby displaying the remaining power of the power bank, the current charging status (such as charging, fully charged, etc.), and information such as charging current and voltage.
[0080] In some embodiments of the wireless charging circuit provided by this utility model, a decoding module is also included, which is electrically connected to the wireless charging module. Specifically, as shown... Figure 5 and Figure 16 As shown, the decoding module includes resistor R4, resistor R129, capacitor C90, and chip U12. Chip U12 is model 9903A3. Pin 1 of chip U12 is connected to one end of capacitor C90 and connection point VDD, respectively, and the other end of capacitor C90 is connected to ground. Further, pin 2 of chip U12 is connected to ground, pin 3 of chip U12 is connected to one end of resistor R129 and pin 22 of chip U11, pin 4 of chip U12 is connected to one end of resistor R4 and pin 23 of chip U11, and the other ends of resistor R4 and resistor R129 are connected to connection point VDD.
[0081] It is understandable that capacitor C90 filters out power supply noise to provide a stable power supply for chip U12. Chip U12 communicates with chip U11 via I2C through clock line SCL_1 and data line SDA_1. Resistors R129 and R4 are used as pull-up resistors to ensure that clock line SCL_1 and data line SDA_1 remain at a high level when there is no signal transmission, preventing communication errors caused by floating state.
[0082] The second aspect of this utility model provides a mobile power supply, including a housing, a battery, a wireless charging transmitting coil, a circuit board, and a wireless charging circuit according to the first aspect embodiment. The surface of the housing is provided with a wireless charging area, the shape of which matches the outline of the device to be charged. The wireless charging circuit is disposed on the circuit board, and the battery, the wireless charging transmitting coil, and the circuit board are disposed in the inner cavity of the housing. The wireless charging transmitting coil is disposed below the wireless charging area.
[0083] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A wireless charging circuit, characterized in that, The device includes a power management module, a buck-boost module, a wireless charging module, and a control module. The power management module is electrically connected to both the buck-boost module and the control module. The buck-boost module is also electrically connected to both the wireless charging module and the control module. The control module includes a power regulation unit and a voltage sampling unit. The power regulation unit is electrically connected to the wireless charging module, and the voltage sampling unit is electrically connected to the battery. The control module is configured to: when the voltage sampling unit detects that the battery operating voltage is in a first voltage range, the power regulation unit outputs a first power regulation signal to control the wireless charging module to output a first power; when the voltage sampling unit detects that the battery operating voltage is in a second voltage range, the power regulation unit outputs a second power regulation signal to control the wireless charging module to output a second power.
2. The wireless charging circuit according to claim 1, characterized in that, It also includes a charging interface module, which is electrically connected to the power management module. The control module is configured such that when the power management module detects that the charging interface module is connected to the device to be charged, the power adjustment unit outputs a third power adjustment signal to control the wireless charging module to output a third power.
3. The wireless charging circuit according to claim 1, characterized in that, The control module further includes a charging indicator unit, which is electrically connected to the wireless charging module. The control module is configured to: when the charging indicator unit receives a first status signal output by the wireless charging module, control the power management module to stop outputting power; when the charging indicator unit receives a second status signal output by the wireless charging module, control the power management module to continuously output power.
4. The wireless charging circuit according to claim 1, characterized in that, It also includes a protocol switching module, which is electrically connected to the wireless charging module and the wireless charging transmitting coil respectively. The wireless charging module is electrically connected to the wireless charging transmitting coil. The wireless charging module controls the protocol switching module to switch the resonant frequency to match the operating frequency of the wireless charging transmitting coil.
5. The wireless charging circuit according to claim 4, characterized in that, The protocol switching module includes a first resonant unit and a second resonant unit, and the wireless charging transmitting coil is electrically connected to the first resonant unit and the second resonant unit respectively.
6. The wireless charging circuit according to claim 1, characterized in that, The power management module includes a battery voltage input terminal and a battery connection unit. The input terminal of the battery connection unit is electrically connected to the battery voltage input terminal, and the output terminal of the battery connection unit is configured as a battery connection terminal.
7. The wireless charging circuit according to claim 6, characterized in that, It also includes a power consumption detection module, which is electrically connected to both the battery connection terminal and the wireless charging module.
8. The wireless charging circuit according to claim 6, characterized in that, It also includes a battery protection module, which includes a positive terminal and a negative terminal. The positive terminal is electrically connected to the positive terminal of the battery and the battery voltage input terminal, respectively, and the negative terminal is electrically connected to the negative terminal of the battery.
9. The wireless charging circuit according to claim 1, characterized in that, It also includes a display module and a button module, wherein the button module is electrically connected to the power management module and the control module respectively, and the display module is electrically connected to the power management module and the control module respectively.
10. A portable power bank, characterized in that, The device includes a housing, a battery, a wireless charging transmitting coil, a circuit board, and a wireless charging circuit as described in any one of claims 1 to 9, wherein the surface of the housing is provided with a wireless charging area, the shape of the wireless charging area matches the outline of the device to be charged, the wireless charging circuit is disposed on the circuit board, the battery, the wireless charging transmitting coil and the circuit board are disposed in the inner cavity of the housing, and the wireless charging transmitting coil is disposed below the wireless charging area.