A power self-regulating charging circuit
By designing a power self-regulating charging circuit, the problems of single charging mode and non-adjustable power in existing charging devices are solved, realizing flexible switching and power adjustment between wired and wireless charging, and improving charging efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN AOHAI TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-31
AI Technical Summary
Most existing charging devices can only support a single charging method and lack power self-adjustment function, resulting in low charging efficiency and potential damage to the device.
Design a power self-regulating charging circuit, including a charging input unit, a switch control unit, a DC step-down unit, a power distribution unit, and wired and wireless charging units. The power distribution unit rationally distributes electrical energy to achieve flexible switching and power adjustment between wired and wireless charging.
It supports both wired and wireless charging simultaneously, and can flexibly adjust the charging power according to needs, improving the flexibility and applicability of charging, avoiding energy waste, protecting equipment, and improving charging efficiency and safety.
Smart Images
Figure CN224583060U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of charging circuit technology, and in particular to a power self-regulating charging circuit. Background Technology
[0002] With the continuous development of electronic devices, people's needs for charging methods are becoming increasingly diversified. Currently, most charging devices on the market can only support a single charging method, that is, either wired charging or wireless charging only, which cannot simultaneously meet users' charging needs in different scenarios. In addition, existing charging circuits often lack power self-regulation functions, and cannot reasonably allocate power according to the actual needs of the charging device, resulting in low charging efficiency, and may even damage the device due to excessive or insufficient power. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the single charging method and the inability to achieve power self-adjustment, and to provide a charging circuit with power self-adjustment.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model provides a power self-regulating charging circuit, including: a charging input unit, a first switch control unit, a second switch control unit, a first DC buck unit, a second DC buck unit, a power distribution unit, a wired charging unit, and a wireless charging unit; the charging input unit is connected to the first switch control unit, the second switch control unit, the first DC buck unit, the second DC buck unit, and the power distribution unit; the power distribution unit is also connected to the first switch control unit, the second switch control unit, the first DC buck unit, and the second DC buck unit; the first DC buck unit is also connected to the first switch control unit and the wired charging unit; the second DC buck unit is also connected to the second switch control unit and the wireless charging unit.
[0005] In one embodiment, the power distribution unit includes a PD controller U1 and a power distribution IC chip U5 connected to the PD controller U1. The input terminal of the PD controller U1 is connected to the charging input unit, and the output terminal is connected to the power distribution IC chip U5, the first DC buck unit, and the second DC buck unit. The power distribution IC chip U5 is also connected to the first switch control unit, the second switch control unit, the first DC buck unit, and the second DC buck unit.
[0006] In one embodiment, the power distribution IC chip U5 has an input voltage pin, a power supply pin, a communication and control pin, a feedback pin, and a voltage output pin; the PD controller U1 is connected to the input voltage pin and the communication and control pin; the first DC buck unit and the second DC buck unit are both connected to the power supply pin, the communication and control pin, and the feedback pin; the first switch control unit and the second switch control unit are both connected to the voltage output pin.
[0007] In one embodiment, both the first DC buck unit and the second DC buck unit include a DC conversion module and a fast charging module; the DC conversion module is connected to the power supply pin, the communication and control pin, the feedback pin, and the PD controller U1; the power distribution IC chip U5 is further provided with a communication and configuration pin and a data transmission pin, and the fast charging module is connected to the communication and configuration pin and the data transmission pin; the DC conversion module and the fast charging module are connected together to the wired charging unit or the wireless charging unit.
[0008] In one embodiment, the first DC step-down unit is further connected to an information display unit.
[0009] In one embodiment, the wireless charging unit includes a filtering module, an MCU main control chip U3, a PWM drive module, a demodulation module, an H-bridge resonant module, and a wireless output module; the second DC buck unit, the filtering module, the MCU main control chip U3, the PWM drive module, the H-bridge resonant module, and the wireless output module are connected in sequence, and the MCU main control chip U3 and the wireless output module are also connected to the demodulation module.
[0010] In one embodiment, the wireless charging unit further includes a boost module; the second DC buck unit is connected to the filter module through the boost module.
[0011] In one embodiment, the MCU main control chip U3 is provided with a pin 24 for outputting a BOOST-PWM signal, and the pin 24 is connected to the feedback pin 17 provided by the boost module.
[0012] In one embodiment, the wireless charging unit further includes an input module, the input terminal of which is connected to the second DC buck unit, and the output terminal is connected to the boost module and / or the MCU main control chip U3.
[0013] In one embodiment, the MCU main control chip U3 is also connected to an authentication module.
[0014] The advantages of this self-regulating power charging circuit compared to existing technologies are as follows: It uses a charging input unit as the energy inlet to provide power to subsequent units. The power distribution unit plays a core role in allocating power rationally and controlling the operating states of the first and second DC step-down units, thereby supplying power to the wired and wireless charging units. When only wired output is needed, the power distribution unit disables the second switch control unit and the second DC step-down unit, allowing the first switch control unit and the first DC step-down unit to output at the maximum power of the wired charging unit. Similarly, if only wireless output is needed, the wireless charging unit can output at its maximum power. When both wired and wireless output are required simultaneously, the power distribution unit allows both wired and wireless charging units to output power simultaneously. This design supports both wired and wireless charging methods, meeting diverse user charging needs. Furthermore, it allows for flexible adjustment and allocation of charging power based on actual requirements, greatly improving charging flexibility and applicability, avoiding energy waste, better protecting charging equipment, and enhancing charging efficiency and safety.
[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A block diagram of the power self-regulating charging circuit provided by this utility model; Figure 2 The circuit schematic diagram of the charging input unit provided by this utility model; Figure 3 Circuit diagram of the first switch control unit and the first DC step-down unit provided by this utility model; Figure 4 The circuit diagram of the second switch control unit and the second DC step-down unit provided by this utility model; Figure 5 The circuit schematic diagram of the power distribution unit provided by this utility model; Figure 6 The circuit schematic diagram of the MCU main control chip U3, the filter module, the PWM drive module, the demodulation module and the crystal oscillator module provided by this utility model; Figure 7Circuit schematic diagram of the H-bridge resonant module and wireless output module provided by this utility model; Figure 8 The circuit schematic diagram of the boost module provided by this utility model; Figure 9 Circuit schematic diagram of the wireless output module provided by this utility model; Figure 10 The circuit diagram of the authentication module provided by this utility model.
[0018] Figure Labels 1. Charging input unit; 2. First switch control unit; 3. Second switch control unit; 4. First DC buck unit; 41. DC conversion module; 42. Fast charging module; 5. Second DC buck unit; 6. Power distribution unit; 7. Wired charging unit; 8. Wireless charging unit; 81. Filtering module; 82. PWM drive module; 83. Demodulation module; 84. H-bridge resonant module; 85. Wireless output module; 86. Boost module; 87. Input module; 88. Authentication module; 881. Power supply submodule; 882. SE IC submodule; 883. NTC submodule; 89. Crystal oscillator module; 9. Information display unit. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0026] See Figures 1 to 10As shown, this utility model provides a specific embodiment of a power self-regulating charging circuit, including: a charging input unit 1, a first switch control unit 2, a second switch control unit 3, a first DC step-down unit 4, a second DC step-down unit 5, a power distribution unit 6, a wired charging unit 7, and a wireless charging unit 8; the charging input unit 1 is connected to the first switch control unit 2, the second switch control unit 3, the first DC step-down unit 4, the second DC step-down unit 5, and the power distribution unit 6, and the power distribution unit 6 is also connected to the first switch control unit 2, the second switch control unit 3, the first DC step-down unit 4, and the second DC step-down unit 5; the first DC step-down unit 4 is also connected to the first switch control unit 2 and the wired charging unit 7; the second DC step-down unit 5 is also connected to the second switch control unit 3 and the wireless charging unit 8.
[0027] Specifically, the charging input unit 1 serves as the energy entry point for the entire circuit, providing power input to subsequent units. The power distribution unit 6 plays a core role in energy allocation, controlling the operating states of the first DC step-down unit 4 and the second DC step-down unit 5 through the rational distribution of power, thereby enabling power supply to the wired charging unit 7 and the wireless charging unit 8. The first switch control unit 2 and the second switch control unit 3 are used to control the on / off state of the circuit and the direction of current flow, ensuring stable circuit operation. During operation, the charging input unit 1 receives power input from an external power source and transmits it to the power distribution unit 6, the first switch control unit 2, the second switch control unit 3, the first DC step-down unit 4, and the second DC step-down unit 5. The power distribution unit 6 distributes power according to preset rules or real-time requirements, providing appropriate voltage and power to the first DC step-down unit 4 and the second DC step-down unit 5 respectively. The first DC step-down unit 4 steps down the received power and transmits it to the wired charging unit 7 via the first switch control unit 2 for wired charging of the device. Similarly, the second DC step-down unit 5 steps down the power and transmits it to the wireless charging unit 8 via the second switch control unit 3 for wireless charging. When only wired output is needed, the power distribution unit 6 de-energizes both the second switch control unit 3 and the second DC step-down unit 5, and allows the first switch control unit 2 and the first DC step-down unit 4 to output at the maximum output power of the wired charging unit 7; conversely, it allows the wireless charging unit 8 to output at maximum power. When both wired and wireless output are required simultaneously, the power distribution unit 6 allows both the wired charging unit 7 and the wireless charging unit 8 to output power simultaneously. The technical advantage of this embodiment is that, through the collaborative work of each unit, a complete power self-regulating charging circuit architecture is constructed, which can simultaneously support both wired and wireless charging methods, and can adjust and distribute the charging power according to actual needs, improving the flexibility and applicability of charging. Understandably, the number of wired charging units 7 can be designed in multiple ways as needed, and the number of the first switch control unit 2 and the first DC step-down unit 4 can be set accordingly.
[0028] For example, when the charging circuit has only one wired output and one wireless output, and the maximum output power of the wired charging unit 7 is 100W and the maximum output power of the wireless charging unit 8 is 30W; if only the wired charging unit 7 is used for power output, its output power is 100W; if only the wireless charging unit 8 is used, its output power is 30W; when both wired and wireless are used simultaneously, the output power of the wired charging unit 7 is 70W, and the output power of the wireless charging unit 8 is 30W, with a maximum simultaneous output power of 100W. The higher the power of the input adapter, the higher the wired output power can be.
[0029] For example, when the charging circuit has two wired outputs and one wireless output, and the maximum output power of the wired charging unit 7 is 100W and the maximum output power of the wireless charging unit 8 is 30W; if only the wired charging unit 7 is outputting power, the combined output power of the two wired charging units 7 is 100W, and the output power of the wireless charging unit 8 is 0; if only one wired charging unit 7 is outputting power, the output power of the wireless charging unit 8 is 30W; and when the wired charging unit 7 and the wireless charging unit 7 are outputting power simultaneously, the output power of the wireless charging unit 8 is 30W, the combined output power of the two wired charging units 7 is 60W (excluding a power loss of 10W), and the maximum output power of all three outputs simultaneously is 100W.
[0030] In one specific embodiment, the power distribution unit 6 includes a PD controller U1 and a power distribution IC chip U5 connected to the PD controller U1. The input terminal of the PD controller U1 is connected to the charging input unit 1, and the output terminal is connected to the power distribution IC chip U5, the first DC buck unit 4, and the second DC buck unit 5. The power distribution IC chip U5 is also connected to the first switch control unit 2, the second switch control unit 3, the first DC buck unit 4, and the second DC buck unit 5.
[0031] Specifically, the PD controller U1 (Power Delivery Controller) is the key control component for the entire power distribution process. Its design principle is based on the PD protocol, enabling it to communicate with the external power supply to obtain its power delivery capacity information. Based on the circuit's needs, it sends control commands to the power distribution IC chip U5 to achieve precise power allocation. Under the control of the PD controller U1, the power distribution IC chip U5 executes the power distribution task, rationally allocating electrical energy to the first DC buck unit 4 and the second DC buck unit 5. During operation, the input terminal of the PD controller U1 is connected to the charging input unit 1 to receive electrical energy from the external power supply. It also communicates with the power supply via the PD protocol to obtain parameters such as the power supply's output voltage and current. Then, the PD controller U1 sends control signals to the power distribution IC chip U5 according to the preset power distribution strategy or the device's charging requirements. Upon receiving the signal, the power distribution IC chip U5, through its connections with the first DC buck unit 4, the second DC buck unit 5, the first switch control unit 2, and the second switch control unit 3, distributes the electrical energy to the corresponding units as required. The technical effect of this embodiment is to achieve precise power allocation based on the PD protocol, which can better match the needs of different power supplies and devices, and improve the compatibility and power utilization efficiency of the charging circuit. It is understood that the power allocation IC chip U5 can be selected from different models and specifications, based on actual power allocation requirements and cost budgets.
[0032] In one specific embodiment, the power distribution IC chip U5 has an input voltage pin (pin 1), a power supply pin (pins 31 and 32), a communication and control pin (pins 9 to 22), a feedback pin (pins 5 and 8), and a voltage output pin (pins 25, 26, 28, and 30); the PD controller U1 is connected to the input voltage pin and the communication and control pin; the first DC step-down unit 4 and the second DC step-down unit 5 are both connected to the power supply pin, the communication and control pin, and the feedback pin; the first switch control unit 2 and the second switch control unit 3 are both connected to the voltage output pin.
[0033] Specifically, the connection method of these pins determines the signal transmission and energy interaction between the power distribution IC chip U5 and other units. The design principle is to achieve communication and control functions between the power distribution IC chip U5 and the PD controller U1, the first DC buck unit 4, the second DC buck unit 5, the first switch control unit 2, and the second switch control unit 3 through the specific connections of these pins. The input voltage pin is used to receive the voltage signal from the charging input unit 1, providing operating power to the power distribution IC chip U5. There are two power supply pins, used to connect the first DC buck unit 4 and the second DC buck unit 5 respectively. The first DC buck unit 4 and the second DC buck unit 5 input electrical energy to the power distribution IC chip U5 through the two power supply pins. This allows the power distribution IC chip U5 to rationally distribute electrical energy based on the electrical energy input from the power supply pins and the control signals received from the input voltage pins. The communication and control pins are used to communicate with the PD controller U1, the first DC buck unit 4, and the second DC buck unit 5, transmitting control signals and status information. The feedback pins receive feedback signals from the first DC buck unit 4 and the second DC buck unit 5, allowing the power distribution IC chip U5 to monitor and adjust power distribution in real time. The voltage output pins output control voltage to the first switch control unit 2 and the second switch control unit 3, controlling the circuit's on / off state and current magnitude. During operation, the voltage signals from the charging input unit 1 and the first DC buck unit 4 and the second DC buck unit 5 are transmitted to the power distribution IC chip U5. Based on these signals and the instructions from the PD controller U1, the power distribution IC chip U5 outputs appropriate voltages to the first switch control unit 2 and the second switch control unit 3 through the voltage output pins, controlling the circuit's operating state. The technical advantage of this embodiment is that it clarifies the connection relationship and signal transmission method between the power distribution IC chip U5 and other units, ensuring the accuracy and stability of power distribution and improving the reliability of the charging circuit. In one specific embodiment, both the first DC buck unit 4 and the second DC buck unit 5 include a DC conversion module 41 and a fast charging module 42; the DC conversion module 41 is connected to the power supply pin, the communication and control pin, the feedback pin, and the PD controller U1; the power distribution IC chip U5 is also provided with a communication and configuration pin and a data transmission pin, and the fast charging module 42 is connected to the communication and configuration pin and the data transmission pin; the DC conversion module 41 and the fast charging module 42 are connected together to the wired charging unit 7 or the wireless charging unit 8.
[0034] Specifically, the DC conversion module 41 is designed to convert the input voltage into a stable voltage suitable for charging the device. Through its connection with the power distribution IC chip U5, it receives power, communication, control, and feedback signals to precisely regulate the output voltage. The fast charging module 42, based on a fast charging protocol, connects to the communication and configuration pins and data transmission pins of the power distribution IC chip U5 to achieve fast charging functionality. During operation, the DC conversion module 41 receives electrical energy from the power pins of the power distribution IC chip U5 and adjusts its operating state according to the signals from the communication and control pins and feedback pins, converting the input voltage into a stable output voltage. The fast charging module 42 receives configuration information from the power distribution IC chip U5 through the communication and configuration pins and transmits fast charging protocol data through the data transmission pins to achieve fast charging functionality. The DC conversion module 41 and the fast charging module 42 work together to transmit the processed electrical energy to the wired charging unit 7 or the wireless charging unit 8 to charge the device. The technical effect of this embodiment is to achieve efficient voltage conversion and fast charging functions, meeting the charging needs of different devices in different scenarios, improving charging speed and user experience.
[0035] In one specific embodiment, the DC conversion module 41 in the first DC buck unit 4 includes a DC conversion chip U2, a resistor R3, a switch Q1, a switch Q2, a capacitor C13, a resistor R5, an inductor L1, a resistor R7, a capacitor C22, a resistor R30, and a switch Q5; the VCC pin 4 of the DC conversion chip U2 is connected to the VDD pin 1 of the PD controller U1; the FB pin 16 of the DC conversion chip U2 is connected to one end of the capacitor C25 and the resistor R12, the other end of the capacitor C25 is connected to the CMPv-A pin 3 of the power distribution IC chip U5 through the resistor R13, and the other end of the resistor R12 is connected to the FB-A pin 5 of the power distribution IC chip U5; the VIN pin 12 of the DC conversion chip U2 is connected to the charging input unit 1, the HG pin 11 is connected to the gate of the switch Q1 through the resistor R3, the drain of the switch Q1 is connected to the charging input unit 1, and the source of the switch Q1 is connected to the DC conversion chip U2. The LX pin 10 of chip U2 is also connected to the BST pin 9 via capacitor C13, and is also connected to one end of inductor L1 and the drain of switching transistor Q2; the gate of switching transistor Q2 is connected to the LG pin 8 of DC conversion chip U2 via resistor R5, and the source is grounded; the other end of inductor L1, VOS2 pin 14 and VOUT pin 15 of DC conversion chip U2 are both connected to the VIN-A power supply pin 32 of power distribution IC chip U5 via resistor R14; the other end of inductor L1 is also connected to one end of resistor R7, capacitor C22 and resistor R30, and is connected to the source of switching transistor Q5; the other ends of resistor R7 and capacitor C22 are interconnected and connected to one end of capacitor C25 and resistor R12; the other end of resistor R30 is connected to pin 30 of power distribution IC chip U5 and the gate of switching transistor Q5, and the drain of switching transistor Q5 is connected to the power input terminal of wired charging unit 7 and the first switch control unit 2.
[0036] Specifically, switching transistors Q1, Q2, and Q5 are all N-channel enhancement-mode MOSFETs. The VCC pin 4 of the DC-DC converter chip U2 is connected to the VDD pin 1 of the PD controller U1. The PD controller U1 provides a stable power supply to the DC-DC converter chip U2 and simultaneously transmits control signals to adjust the operating state of the DC-DC converter chip U2, thereby adjusting the output power. The VIN pin 12 of the DC-DC converter chip U2 is connected to the charging input unit 1, obtaining power from it to provide an energy source for subsequent DC-DC conversion. The FB pin 16 of the DC-DC converter chip U2 is connected to the CMPv-A pin 3 and FB-A pin 5 of the power distribution IC chip U5 through capacitor C25 and resistors R12 and R13. The FB pin 16 is used to detect the output voltage and transmit the feedback signal of the output voltage to the power distribution IC chip U5. Based on the received feedback signal, the power distribution IC chip U5 determines whether the output voltage meets the requirements and adjusts the operation of the DC-DC converter chip U2 through corresponding control signals to achieve output voltage stability. The HG pin 11 of the DC converter chip U2 is connected to the gate of the switching transistor Q1 through resistor R3, and the LG pin 8 is connected to the gate of the switching transistor Q2 through resistor R5. The DC converter chip U2 controls the signals on the HG and LG pins to alternately turn the switching transistors Q1 and Q2 on and off. When Q1 is on and Q2 is off, the electrical energy from the charging input unit 1 charges and stores energy in the inductor L1 through the switching transistor Q1; when Q1 is off and Q2 is on, the inductor L1 releases energy and continues to power subsequent circuits. Capacitor C13 acts as a bootstrap capacitor, providing a suitable drive voltage to the gate of the switching transistor Q1. Inductor L1 and capacitor C22 form an LC filter circuit to filter the pulsating voltage generated by the switching transistors, resulting in a smooth DC output voltage. The other end of inductor L1 is connected to the VIN-A power pin 32 of the power distribution IC chip U5 via resistor R14, transferring the converted and filtered power to the power distribution IC chip U5. It is also connected to resistor R7, capacitor C22, resistor R30, and the source of the switching transistor Q5. Resistor R30 transmits the control signal from pin 30 of the power distribution IC chip U5 to the gate of the switching transistor Q5, controlling its on / off state. When the switching transistor Q5 is on, it transfers the processed power to the power input terminal of the wired charging unit 7 and the first switch control unit 2, supplying power to the wired charging device.
[0037] Through the coordinated operation of the feedback circuit and DC conversion chip U2, the output voltage can be precisely adjusted according to the charging requirements of the device and the power supply capacity of the external power source, ensuring a suitable voltage for the wired charging unit 7, improving charging efficiency and device safety. The use of switching transistors Q1 and Q2 enables the DC conversion module 41 to achieve efficient power conversion and reduce energy loss. The N-channel enhancement-mode MOSFET features low on-resistance and fast switching speed, allowing for rapid on- and off-state operation, achieving rapid power transmission and conversion. The filtering and energy storage circuit composed of capacitors C13 and C22 and inductor L1 effectively removes noise from the electrical energy, ensuring the stability and purity of the output voltage, providing a stable and reliable power supply for the wired charging unit 7, and helping to extend the device's lifespan. The DC conversion module 41, through its connection with the PD controller U1 and power distribution IC chip U5, can flexibly adjust its operating mode and output voltage according to different charging scenarios and device requirements. For example, when the device's battery is low, the output power is increased to accelerate charging; when the device is nearing full charge, the output power is reduced to protect the battery. Meanwhile, the power distribution IC chip U5 controls the switching transistor Q5, enabling the output of the DC conversion module 41 to flexibly connect to the wired charging unit 7 and the first switching control unit 2, achieving reasonable power distribution. Capacitor C13 is connected to the source of the switching transistor Q1 and pin 9 of the DC conversion chip U2, acting as a filter to remove high-frequency noise from the electrical energy, making the output power more stable. Inductor L1, as an energy storage element, stores energy when the switching transistor Q1 is on and releases energy when it is off, maintaining a stable output voltage. Capacitor C22, in conjunction with resistor R7, further filters the output voltage, ensuring that the voltage output to the wired charging unit 7 is stable and pure.
[0038] In one specific embodiment, the fast charging module 42 in the first DC step-down unit 4 includes resistors R61, R62, R63, and R8, diodes D3, D4, and D5; one end of resistors R61, R62, and R63 is connected to the DP-A pin 20, DM-A pin 21, and CC1-A pin 22 of the power distribution IC chip U5, respectively; the other end of resistors R61, R62, and R63 is connected to the cathodes of diodes D3, D4, and D5, respectively, and is also connected to the wired charging unit 7; the anodes of diodes D3, D4, and D5 are all grounded through resistor R8; the two ends of resistor R8 are also connected to the CSP-A pin 14 and CSN-A pin 13 of the power distribution IC chip U5, respectively.
[0039] Specifically, pins DP-A 20, DM-A 21, and CC1-A 22 of the power distribution IC chip U5 are connected to the wired charging unit 7 via resistors R61, R62, and R63, respectively. These pins are typically used to transmit signals related to the fast charging protocol. The resistors limit current and match impedance, ensuring stable and accurate signal transmission between the power distribution IC chip and the wired charging unit 7 to identify the connection of the fast charging device and the interaction of related protocols. The cathodes of diodes D3, D4, and D5 are connected to the other ends of resistors R61, R62, and R63, respectively, while the anodes are grounded through resistor R8. When abnormal voltages occur, such as transient overvoltages, the diodes conduct, clamping the voltage within a certain range to prevent excessive voltage from damaging the subsequent wired charging unit 7 or other related circuit components, thus protecting the circuit. Simultaneously, resistor R8 also limits current, preventing excessive current from flowing through the diodes. The two ends of resistor R8 are connected to pins CSP-A 14 and CSN-A 13 of the power distribution IC chip U5, respectively; these two pins are used for current detection. By measuring the voltage difference across resistor R8, the power distribution IC chip U5 can calculate the current in the fast charging module 42, thereby enabling the monitoring and control of the charging current and ensuring the safety and stability of the charging process.
[0040] Connecting the signal pins between the power distribution IC chip and the wired charging unit 7 via a resistor facilitates accurate transmission of fast charging protocol signals, enabling the charging circuit to better support various devices that support different fast charging protocols, thus improving the circuit's versatility and applicability. The protection circuit composed of diodes and resistors effectively suppresses transient overvoltages, protecting sensitive components from voltage surges and improving the overall reliability and stability of the charging circuit, reducing the risk of malfunctions and damage caused by abnormal voltage. By using resistor R8 in conjunction with the current detection pin of the power distribution IC chip, the current in the fast charging module 42 can be accurately monitored. This allows the charging circuit to intelligently adjust according to the actual current, such as implementing overcurrent protection and precisely allocating power according to device requirements, further enhancing charging safety and efficiency.
[0041] It is understandable that the structure and principle of the first DC step-down unit 4 and the second DC step-down unit 5 are basically the same, so they will not be described again in the following text.
[0042] In one specific embodiment, the first DC step-down unit 4 is also connected to an information display unit 9.
[0043] Specifically, the information display unit 9 includes a sampling resistor, a sampling control chip, and a display connected in sequence. The sampling resistor is also connected to the output terminal of the first DC step-down unit 4. Through the combination of the sampling resistor, control chip, and display, the information display unit 9 can sample the electrical parameters at the output terminal of the first DC step-down unit 4 in real time. After processing by the chip, the electrical performance data such as power, voltage, and current are displayed intuitively on the display. It can also display information such as charging protocol, charging symbol, and brand logo, allowing users to clearly understand the device's working status and charging progress, improving ease of use and interactive experience, and enhancing product usability and brand recognition. It is understood that in this embodiment, the connection method between the sampling resistor and the sampling control chip used in the information display unit 9 is a common current sampling scheme in the prior art, and its specific working principle will not be elaborated here.
[0044] In one specific embodiment, the first switch control unit 2 includes a switch transistor Q6, a switch transistor Q7, resistors R31, R32, R33, and R34; the charging input unit 1 is connected to the source of the switch transistor Q6 and also to one end of the resistor R31; the drain of the switch transistor Q6 is connected to the output terminal of the first DC step-down unit 4; the other end of the resistor R31 is connected to the gate of the switch transistor Q6 and one end of the resistor R32; the other end of the resistor R32 is connected to the drain of the switch transistor Q7; the gate of the switch transistor Q7 is connected to one end of the resistors R33 and R34; the other end of the resistor R33 is connected to the voltage output pin of the power distribution IC chip U5; the other end of the resistor R34 is grounded together with the source of the switch transistor Q7.
[0045] Specifically, switch Q6 is a P-channel insulated-gate field-effect transistor (IGFET), and switch Q7 is an N-channel enhancement-mode field-effect transistor (EMF). The core design of this first switch control unit 2 lies in utilizing the switching characteristics of the EMF and the voltage division and current limiting functions of resistors to achieve precise control over circuit on / off and current flow. The P-channel IMF is chosen as switch Q6 because it can easily achieve conduction and cutoff by controlling the gate potential when the source is connected to a high potential, making it suitable for controlling the connection between the power supply and the load. The N-channel EMF, as switch Q7, conducts when a suitable positive voltage is applied to the gate, and can be used to control the gate potential of switch Q6, thereby controlling the on / off state of the entire circuit. Resistors R31, R32, R33, and R34 serve as voltage dividers and current limiters, ensuring that the EMF operates in a safe and stable state, while accurately controlling the conduction and cutoff of the EMF based on the output signal of the power distribution IC chip U5. The charging input unit 1 delivers electrical energy to the source of the switching transistor Q6 and is also connected to one end of the resistor R31. The power distribution IC chip U5 outputs a control signal through its voltage output pin, which is transmitted to the gate of the switching transistor Q7 via resistor R33. When the power distribution IC chip U5 outputs a suitable high-level signal, the switching transistor Q7 is turned on. At this time, the gate of the switching transistor Q6 is grounded through resistor R32 and the turned-on switching transistor Q7, making the gate potential of the switching transistor Q6 lower than the source potential. The switching transistor Q6 is turned on, and the electrical energy of the charging input unit 1 is transmitted to the output of the first DC buck unit 4 through the switching transistor Q6, supplying power to the subsequent wired charging unit 7. When the power distribution IC chip U5 outputs a low-level signal, the switching transistor Q7 is turned off. The gate of the switching transistor Q6 is connected to the voltage of the charging input unit 1 through resistor R31, making the gate potential of the switching transistor Q6 close to the source potential. The switching transistor Q6 is turned off, cutting off the connection between the charging input unit 1 and the output of the first DC buck unit 4. The control signal output by the power distribution IC chip U5 precisely controls the on / off state of switching transistors Q6 and Q7, thereby achieving precise control over the circuit connection between the charging input unit 1 and the output of the first DC step-down unit 4. This allows the charging circuit to be flexibly turned on or off according to actual needs, improving charging safety and efficiency. Resistors R31, R32, R33, and R34 act as voltage dividers and current limiters, preventing excessive current and voltage from damaging switching transistors Q6 and Q7. Simultaneously, the characteristics of the field-effect transistors (FETs) enable them to respond quickly during on / off states, reacting promptly to abnormal conditions in the circuit and further protecting the safety of the entire charging circuit. This switch control unit operates according to the output signal of the power distribution IC chip U5, working in conjunction with the power distribution unit 6 to achieve reasonable distribution of charging power.When more power is needed for the wired charging unit 7, the power distribution IC chip U5 outputs a suitable signal to turn on the switching transistor Q6; when charging is not needed, the switching transistor Q6 is turned off, thus realizing flexible adjustment and distribution of power.
[0046] Furthermore, the structure of the second switch control unit 3 is basically the same as that of the first switch control unit 2. The connection structure between the second switch control unit 3 and the charging input unit 1, the second DC step-down unit 5 and the power distribution IC chip U5 is also basically the same as that between the first switch control unit 2 and the charging input unit 1, the second DC step-down unit 5 and the power distribution IC chip U5. Therefore, it will not be described again below.
[0047] In one specific embodiment, the wireless charging unit 8 includes a filtering module 81, an MCU main control chip U3, a PWM drive module 82, a demodulation module 83, an H-bridge resonant module 84, and a wireless output module 85; the second DC buck unit 5, the filtering module 81, the MCU main control chip U3, the PWM drive module 82, the H-bridge resonant module 84, and the wireless output module 85 are connected in sequence, and the MCU main control chip U3 and the wireless output module 85 are also connected to the demodulation module 83.
[0048] Specifically, wireless power transmission and control are achieved through the coordinated operation of various modules. The filtering module 81 filters the input power, removing noise and improving power quality. The MCU main control chip U3, as the core control unit, is responsible for controlling and managing the entire wireless charging process, adjusting charging parameters and monitoring status through communication with other modules. The PWM drive module 82 generates a pulse width modulation signal according to the instructions of the MCU main control chip U3, driving the H-bridge resonant module 84. The H-bridge resonant module 84 converts the power into a high-frequency AC signal and transmits it as an electromagnetic field through the wireless output module 85. The demodulation module 83 receives the signal fed back from the wireless output module 85 and converts it into a signal recognizable by the MCU main control chip U3 for control and adjustment. During operation, the power output from the second DC step-down unit 5 is first filtered by the filtering module 81 before being transmitted to the MCU main control chip U3. The MCU main control chip U3, according to a preset program or external instructions, controls the PWM drive module 82 to generate a suitable pulse width modulation signal, driving the H-bridge resonant module 84. The H-bridge resonant module 84 converts electrical energy into a high-frequency AC signal, which is then transmitted through the wireless output module 85 to wirelessly charge the receiving device. Simultaneously, the wireless output module 85 feeds back charging status and other information to the demodulation module 83. The demodulation module 83 processes the signal and transmits it to the MCU main control chip U3, which adjusts the charging parameters based on the feedback information. The technical effect of this embodiment is that it achieves complete wireless charging functionality, enabling stable and efficient wireless charging of devices and improving charging convenience.
[0049] In one specific embodiment, the wireless charging unit 8 further includes a boost module 86; the second DC buck unit 5 is connected to the filter module 81 through the boost module 86.
[0050] Specifically, the second DC buck unit 5 is connected to the filter module 81 via a boost module 86. Its design principle is that in some cases, the voltage output by the second DC buck unit 5 may not meet the needs of the wireless charging unit 8. The boost module 86 increases the voltage to ensure normal wireless charging. During operation, the electrical energy output by the second DC buck unit 5 first enters the boost module 86. The boost module 86, according to the control signal from the MCU main control chip U3, increases the voltage to a suitable level and then transmits it to the filter module 81. The technical effect of this embodiment is to solve the problem of insufficient voltage that may occur during wireless charging, improve the adaptability of the wireless charging unit 8 to different input voltages, and ensure the stability and reliability of wireless charging.
[0051] In one specific embodiment, the MCU main control chip U3 is provided with a pin 24 for outputting a BOOST-PWM signal, and the pin 24 is connected to the feedback pin 17 provided by the boost module 86.
[0052] Specifically, through this connection method, the MCU main control chip U3 can monitor the operating status of the boost module 86 in real time and adjust the output voltage of the boost module 86 as needed. The MCU main control chip U3 outputs a BOOST-PWM signal through pin 24 to control the operation of the boost module 86. The boost module 86 feeds back its output voltage and other status information to the MCU main control chip U3 through feedback pin 17. The MCU main control chip U3 adjusts parameters such as the duty cycle of the BOOST-PWM signal based on the feedback information, thereby achieving precise regulation of the output voltage of the boost module 86. During operation, when the wireless charging unit 8 requires a higher voltage, the MCU main control chip U3 outputs a suitable BOOST-PWM signal through pin 24 to drive the boost module 86 to work. The boost module 86 increases its output voltage and feeds back the voltage information to the MCU main control chip U3 through feedback pin 17. Based on the feedback information, the MCU main control chip U3 determines whether the output voltage meets the requirements. If not, it adjusts the BOOST-PWM signal until the output voltage meets the requirements. The technical effect of this embodiment is that it achieves precise control of the output voltage of the boost module 86, improves the working stability and efficiency of the wireless charging unit 8, and ensures the accuracy and reliability of the voltage during the wireless charging process.
[0053] In one specific embodiment, the wireless charging unit 8 further includes an input module 87, the input terminal of which is connected to the second DC buck unit 5, and the output terminal is connected to the boost module 86 and / or the MCU main control chip U3.
[0054] Specifically, the input module 87, as a key component of the wireless charging unit 8, plays a crucial role in connecting the upstream and downstream components. Its input terminal connects to the second DC buck unit 5, receiving the stepped-down power. Since the power output from the second DC buck unit 5 may contain fluctuations and noise, the main function of the input module 87 is to preprocess this power, ensuring a more stable and suitable supply to the subsequent boost module 86 and / or MCU main control chip U3. Simultaneously, the input module 87 can also rationally allocate and adjust the power according to the different needs of the boost module 86 and MCU main control chip U3, ensuring the efficient and stable operation of the entire wireless charging unit 8. When the second DC buck unit 5 outputs power, the input module 87 first detects and analyzes it to determine if the voltage, current, and other parameters meet the requirements. If fluctuations or noise are present, the input module 87 filters the power to remove noise, making the power purer and more stable. Then, the input module 87 allocates the power according to the real-time needs of the boost module 86 and MCU main control chip U3. If the boost module 86 requires more power to increase the voltage to meet the power requirements of wireless charging, the input module 87 will supply more power to the boost module 86. Similarly, if the MCU main control chip U3 needs power for data processing, control, and monitoring, the input module 87 will provide appropriate power accordingly. Throughout the process, the input module 87 monitors the power status and the changing needs of each module in real time, dynamically adjusting the power distribution and output. By filtering and preprocessing the power output from the second DC buck unit 5, the input module 87 can effectively reduce power fluctuations and noise, providing a more stable power supply for the boost module 86 and the MCU main control chip U3, thereby improving the stability and reliability of the entire wireless charging unit 8. Simultaneously, the input module 87 can flexibly adjust the power distribution and output according to the different needs of the boost module 86 and the MCU main control chip U3, enabling each module to operate under suitable power conditions and enhancing the adaptability of the wireless charging unit 8 to different devices and application scenarios. In addition, proper power distribution and adjustment can avoid power waste, improve power utilization efficiency, and thus reduce the overall energy consumption of the wireless charging system.
[0055] In one specific embodiment, the input module 87 includes a connector J1, a bidirectional breakdown diode D1, a bidirectional breakdown diode D2, a bidirectional breakdown diode D3, a bidirectional breakdown diode D4, a bidirectional breakdown diode D5, a resistor R6, a resistor R7, a resistor R9, a resistor R11, a resistor R12, and a resistor R13. Connector J1 is connected to the output of the second DC step-down unit 5. The VBUS pin of connector J1 is connected to the power input of the boost module 86 and / or the MCU main control chip U3, and is grounded through bidirectional breakdown diode D1. The CC1 pin of connector J1 is grounded through bidirectional breakdown diode D2 and resistor R12 connected in parallel with bidirectional breakdown diode D2, and is also connected to the MCU main control chip U3 through resistor R6. The CC2 pin of connector J1 is grounded through bidirectional breakdown diode D3 and resistor R13 connected in parallel with bidirectional breakdown diode D3, and is connected to the MCU main control chip U3 through resistor R7. The DP pin of connector J1 is grounded through bidirectional breakdown diode D4 and is connected to the MCU main control chip U3 through resistor R9. The DN pin of connector J1 is grounded through bidirectional breakdown diode D5 and is connected to the MCU main control chip U3 through resistor R11.
[0056] The design principle of input module 87 is mainly based on signal transmission, protection, and interactive control with other modules. Connector J1 serves as the interface for connecting to the second DC buck unit 5, providing both power and signal input. The bidirectional breakdown diode is used for overvoltage protection; when the voltage exceeds its breakdown voltage, the diode conducts, releasing excess voltage to ground and preventing damage to subsequent circuits. The resistor serves as a current limiter and voltage divider, protecting the MCU main control chip U3 from excessive current surges and adjusting the signal to meet the input requirements of the MCU main control chip U3. Through this design, input module 87 can stably transmit power and signals from the second DC buck unit 5 to the boost module 86 and / or the MCU main control chip U3, while ensuring the safety and stability of the entire circuit. When the second DC buck unit 5 outputs power and signals, connector J1 receives these inputs. For power transmission, the VBUS pin of connector J1 directly transmits power to the power input terminal of boost module 86 and / or MCU main control chip U3, providing them with the energy required for operation. During this process, bidirectional breakdown diode D1 constantly monitors the voltage of the VBUS pin. If an overvoltage condition occurs, D1 will quickly conduct, guiding the excess voltage to ground and protecting subsequent circuits. For signal transmission, the CC1, CC2, DP, and DN pins each undertake different signal transmission tasks. Taking the CC1 pin as an example, it is grounded through bidirectional breakdown diode D2 and resistor R12, and simultaneously connected to the MCU main control chip U3 through resistor R6. When the CC1 pin receives a signal, resistor R12 adjusts the signal, bidirectional breakdown diode D2 provides overvoltage protection, and resistor R6 limits the current, ultimately transmitting the appropriate signal to the MCU main control chip U3. The operation of other pins is similar, achieving safe signal transmission and processing through the cooperation of corresponding bidirectional breakdown diodes and resistors. The presence of bidirectional breakdown diodes enables input module 87 to effectively handle overvoltage conditions. When voltage spikes or abnormal overvoltages occur, the diode quickly conducts, releasing excess voltage to ground. This prevents damage to the boost module 86 and the MCU main control chip U3 caused by excessive voltage, improving the reliability and stability of the entire circuit. Resistors serve to limit current and divide voltage. By appropriately selecting the resistor value, the input signal can be adjusted to a suitable range, meeting the input requirements of the MCU main control chip U3, ensuring accurate signal recognition and processing. The design of the input module 87 can adapt to different input signals and power requirements, exhibiting good compatibility. Simultaneously, through stable transmission and processing of power and signals, the normal operation of the boost module 86 and the MCU main control chip U3 is ensured, improving the performance and stability of the entire wireless charging unit 8.
[0057] In one specific embodiment, the MCU main control chip U3 is also connected to an authentication module 88.
[0058] Specifically, the design principle of connecting the MCU main control chip U3 to the authentication module 88 is to improve the security of wireless charging and prevent unauthorized devices from accessing the charging system. The authentication module 88, through communication with the MCU main control chip U3, authenticates the devices receiving wireless charging. Only authenticated devices can charge, thus ensuring the security of the charging system. During operation, when a device accesses the wireless charging system, the MCU main control chip U3 controls the authentication module 88 to authenticate the device. The authentication module 88 communicates with the device to obtain its identity information and compares it with preset information for legitimate devices. If the device authentication is successful, the authentication module 88 sends a charging permission signal to the MCU main control chip U3, and the MCU main control chip U3 controls the wireless charging unit 8 to start charging the device; if the authentication fails, the MCU main control chip U3 controls the wireless charging unit 8 to stop charging. The technical effect of this embodiment is to enhance the security of the wireless charging system, effectively prevent unauthorized devices from accessing the charging system, and protect the user's device and data security.
[0059] In one specific embodiment, the authentication module 88 includes a power supply submodule 881, an SE IC submodule 882, and an NTC submodule 883. The power supply submodule 881 is connected to the SE IC submodule 882 to provide a stable operating voltage for the SE IC submodule 882. The SE IC submodule 882 is connected to the MCU main control chip U3 and realizes data interaction through communication protocols such as I2C, so that the MCU main control chip U3 can send authentication commands to the SE IC submodule 882 and receive authentication results. The NTC submodule 883 is connected to the MCU main control chip U3 to transmit the detected temperature signal to the MCU main control chip U3 so that the MCU main control chip U3 can obtain temperature information for system temperature monitoring and control strategy adjustment.
[0060] The authentication module 88, through the collaborative work of its submodules, brings significant advantages to the wireless charging system in terms of power supply stability, security verification, and temperature monitoring, effectively improving the system's reliability, security, and intelligence. The power supply submodule 881 provides a stable operating voltage to the SE IC submodule 882 (Security Element IC submodule), ensuring its continuous and stable operation. Stable power supply is fundamental for the SE IC submodule 882 to perform authentication tasks, avoiding authentication errors or system failures caused by voltage fluctuations, ensuring the accuracy and stability of the entire authentication process, and thus providing strong support for the reliable operation of the wireless charging system. The SE IC submodule 882 interacts with the MCU main control chip U3 via communication protocols such as I2C, enabling the MCU main control chip U3 to send authentication commands to the SE IC submodule 882 and receive authentication results promptly. This mechanism enables strict identity verification of devices connected to the wireless charging system; only authenticated devices can charge normally, effectively preventing unauthorized device access, protecting user equipment and data security, and improving the security and protection capabilities of the wireless charging system. The NTC submodule 883 (Negative Temperature Coefficient submodule) transmits the detected temperature signal to the MCU main control chip U3, enabling U3 to acquire temperature information in real time. This function is crucial for the wireless charging system. The MCU main control chip U3 can adjust the system control strategy promptly based on temperature conditions, such as reducing charging power or pausing charging when the temperature is too high, avoiding safety hazards caused by overheating, extending device lifespan, and enhancing system reliability and stability. The power supply submodule 881, SE IC submodule 882, and NTC submodule 883 work together to form a fully functional authentication module 88. Stable power supply provides the foundation for authentication and temperature monitoring; authentication ensures the safety of the charging device, while temperature monitoring ensures the system operates in a suitable temperature environment. The three modules work together to comprehensively improve the performance of the wireless charging system, providing users with a safer, more reliable, and more efficient charging experience.
[0061] In one specific embodiment, the MCU main control chip U3 is also connected to a crystal oscillator module 89.
[0062] Specifically, the design principle of connecting the MCU main control chip U3 to the crystal oscillator module 89 is to provide a stable clock signal for the MCU main control chip U3, ensuring its normal operation. The clock signal generated by the crystal oscillator module 89 is the basis for the MCU main control chip U3 to perform data processing, communication, and control operations. A stable clock signal ensures that the MCU main control chip U3 accurately executes various instructions, improving the working stability and reliability of the entire wireless charging unit 8. During operation, the crystal oscillator module 89 continuously generates a stable clock signal and transmits it to the MCU main control chip U3. The MCU main control chip U3 performs internal timing control and data processing based on this clock signal, coordinating the work between various modules. For example, when controlling the PWM drive module 82 to generate a pulse width modulation signal, the MCU main control chip U3 precisely controls the frequency and duty cycle of the signal according to the clock signal; when communicating with other modules, it also relies on the clock signal for synchronous data transmission. The technical effect of this embodiment is to improve the working stability and reliability of the MCU main control chip U3, thereby ensuring the normal operation of the entire wireless charging unit 8 and ensuring the stability and accuracy of the wireless charging process.
[0063] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.
Claims
1. A power self-regulating charging circuit, characterized by, include: The system includes a charging input unit, a first switch control unit, a second switch control unit, a first DC step-down unit, a second DC step-down unit, a power distribution unit, a wired charging unit, and a wireless charging unit. The charging input unit is connected to the first switch control unit, the second switch control unit, the first DC step-down unit, the second DC step-down unit, and the power distribution unit. The power distribution unit is also connected to the first switch control unit, the second switch control unit, the first DC step-down unit, and the second DC step-down unit. The first DC step-down unit is also connected to the first switch control unit and the wired charging unit. The second DC step-down unit is also connected to the second switch control unit and the wireless charging unit.
2. The power self-adjusting charging circuit of claim 1, wherein, The power distribution unit includes a PD controller U1 and a power distribution IC chip U5 connected to the PD controller U1. The input terminal of the PD controller U1 is connected to the charging input unit, and the output terminal is connected to the power distribution IC chip U5, the first DC buck unit, and the second DC buck unit. The power distribution IC chip U5 is also connected to the first switch control unit, the second switch control unit, the first DC buck unit, and the second DC buck unit.
3. The power self-adjusting charging circuit of claim 2, wherein, The power distribution IC chip U5 has an input voltage pin, a power supply pin, a communication and control pin, a feedback pin, and a voltage output pin; the PD controller U1 is connected to the input voltage pin and the communication and control pin; the first DC buck unit and the second DC buck unit are both connected to the power supply pin, the communication and control pin, and the feedback pin; the first switch control unit and the second switch control unit are both connected to the voltage output pin.
4. The power self-adjusting charging circuit of claim 3, wherein, Both the first DC step-down unit and the second DC step-down unit include a DC conversion module and a fast charging module; the DC conversion module is connected to the power supply pin, the communication and control pin, the feedback pin, and the PD controller U1; the power distribution IC chip U5 is also provided with a communication and configuration pin and a data transmission pin, and the fast charging module is connected to the communication and configuration pin and the data transmission pin; the DC conversion module and the fast charging module are connected together to the wired charging unit or the wireless charging unit.
5. The power self-adjusting charging circuit of claim 1, wherein, The first DC step-down unit is also connected to an information display unit.
6. The power self-adjusting charging circuit of claim 1, wherein, The wireless charging unit includes a filtering module, an MCU main control chip U3, a PWM drive module, a demodulation module, an H-bridge resonant module, and a wireless output module; the second DC buck unit, the filtering module, the MCU main control chip U3, the PWM drive module, the H-bridge resonant module, and the wireless output module are connected in sequence, and the MCU main control chip U3 and the wireless output module are also connected to the demodulation module.
7. The power self-adjusting charging circuit of claim 6, wherein, The wireless charging unit also includes a boost module; the second DC buck unit is connected to the filter module through the boost module.
8. The power self-adjusting charging circuit of claim 7, wherein, The MCU main control chip U3 has a pin 24 for outputting BOOST-PWM signals, and the pin 24 is connected to the feedback pin 17 of the boost module.
9. The power self-adjusting charging circuit of claim 6, wherein, The wireless charging unit also includes an input module, the input terminal of which is connected to the second DC buck unit, and the output terminal is connected to the boost module and / or the MCU main control chip U3.
10. The power self-adjusting charging circuit of claim 6, wherein, The MCU main control chip U3 is also connected to an authentication module.