Operating circuit for separating the power supply of a communication component

Abstract

The application discloses an operating circuit of a power supply assembly of a separated communication, comprising a base circuit and a cup body circuit, the base circuit and the cup body circuit are connected separably through a coupling assembly; the base circuit is provided with an MCU U1, a power supply control module, a handshake signal output end; the cup body circuit is provided with an MCU U7, a charging chip U5, a charging control module, a handshake signal receiving end and a sharp current suppression module, the sharp current suppression module is a capacitor C21 connected in parallel between a G electrode and an S electrode of a MOS tube Q8, the capacitor C21 and a resistor R6 increase the equivalent capacitor between the G electrode and the S electrode of the MOS tube Q8, and sharp current generated in a charging process is suppressed. In the application, through a bidirectional handshake communication mechanism of the base circuit and the cup body circuit, the accuracy of connection and the reliability of communication are guaranteed; through the sharp current suppression module between the G electrode and the S electrode of the MOS tube in the cup body circuit, damage of elements by sharp charging current is effectively avoided, and the safety and stability of the charging process are improved.

Description

Technical Field

[0001] This application relates to the field of home appliance technology, specifically to an operating circuit for a power supply component with separate communication. Background Technology

[0002] Currently, in household appliances such as electric kettles or electric cups, the base and the kettle (cup) body are mostly designed separately. The base is used to connect to an external power source, and the kettle (cup) body is connected to the base and then heated. After heating, the kettle (cup) body can be removed to pour or fill water, which improves the convenience and safety of use.

[0003] When using a kettle (cup) with a charging function, after connecting the kettle (cup) to the base, a spike current is easily generated when power is turned on, which can cause component failure and affect the normal operation of the circuit. Utility Model Content

[0004] This application provides an operating circuit for a power supply component for separate communication, which aims to at least improve the technical problems existing in the prior art.

[0005] In accordance with the above objectives, this application provides an operating circuit for a power supply component for separate communication, characterized in that it includes a base circuit and a cup circuit, wherein the base circuit and the cup circuit are detachably connected by a coupling component. The base circuit includes an MCU U1, a power supply control module, and a handshake signal output terminal. The signal output pin of the MCU U1 is electrically connected to the handshake signal output terminal. The handshake signal output terminal communicates with the cup body circuit via a coupling component. The power supply control module is used to output a stable power supply to the cup body circuit. The cup body circuit includes an MCU U7, a charging chip U5, a charging control module, and a peak current suppression module. The signal receiving pin of the MCU U7 is electrically connected to the handshake signal terminal of the coupling component. The LED1 pin of the charging chip U5 is electrically connected to the charge full pin of the MCU U7. The charging control module includes a MOSFET Q8 and a control resistor R86. The gate of the MOSFET Q8 is electrically connected to the MCU_PMOS2 pin of the MCU U7 via the resistor R86. Its source is electrically connected to the BAT terminal, and its drain is electrically connected to the VBUS terminal. The peak current suppression module is a capacitor C21 connected in parallel between the gate and source of the MOSFET Q8. The capacitor C21 and the resistor R86 suppress the peak current generated during charging by increasing the equivalent capacitance between the gate and source of the MOSFET Q8.

[0006] This application has the following beneficial effects: the bidirectional handshake communication mechanism between the base circuit and the cup body circuit ensures the accuracy of device connection and the reliability of communication; the RC equivalent circuit peak current suppression module between the GS terminals of the MOS transistor in the cup body circuit effectively avoids damage to components caused by charging peak current, further improving the safety and stability of the charging process and extending the service life of the device.

[0007] Furthermore, the MCU U1 sends an MCU_SIGN handshake signal to the cup body circuit through the handshake signal output terminal, and the MCU U7 receives the signal through the handshake signal receiver terminal and feeds back a response signal, thereby realizing bidirectional handshake communication between the cup body circuit and the base circuit.

[0008] Furthermore, the MCU U1 and the MCU U7 communicate via the TXD / RXD pin or the SDA / SCL pin.

[0009] Furthermore, the capacitance value of capacitor C21 in the peak current suppression module is ≤10μF, and the withstand voltage is not less than 50V.

[0010] Furthermore, the power supply control module of the base circuit includes a MOSFET Q20 and a control resistor. The gate of the MOSFET Q20 is electrically connected to the MCU_PMOS1 pin of the MCU U1 via the control resistor, the source is grounded, and the drain is electrically connected to the VCC-OUT terminal of the base circuit. The VCC-OUT terminal supplies power to the cup circuit via a coupling component.

[0011] Furthermore, the FPC interface is a surface mount header, and the cup body circuit and the base circuit achieve bidirectional transmission of VCC, GND, MCU_SIGN, and HT_ON signals through the FPC interface.

[0012] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the MCU U1 circuit of the base circuit of the operating circuit of the power supply component for separate communication provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the power supply control module circuit of the base circuit of the operating circuit of a power supply component for separate communication provided in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of the MCU U7 circuit of the operating circuit of a power supply component for separate communication provided in an exemplary embodiment of this application; Figure 4This is a schematic diagram of the charging chip U5 in the cup body circuit of the operating circuit of a power supply component for separate communication provided in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the charging control module and spike current suppression module circuit of the cup body circuit of the operating circuit of the power supply component for separate communication provided in an exemplary embodiment of this application. Figure 6 This is a schematic diagram of the voltage detection module circuit of the cup body circuit of the operating circuit of a power supply component for separate communication provided in an exemplary embodiment of this application; Figure 7 This is a schematic diagram of the coupling component circuit of the cup body circuit of the operating circuit of a power supply component for separate communication provided in an exemplary embodiment of this application. Detailed Implementation

[0014] To better illustrate this utility model, a further detailed description of this utility model is provided below with reference to the accompanying drawings.

[0015] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0016] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0017] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0018] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0019] As attached Figure 1-7 As shown, this application provides an operating circuit for a power supply component for separate communication through the following technical solution, which includes a base circuit and a cup circuit, wherein the base circuit and the cup circuit are detachably connected through a coupling component; The base circuit includes an MCU U1, a power supply control module, and a handshake signal output terminal. The signal output pin of the MCU U1 is electrically connected to the handshake signal output terminal. The handshake signal output terminal communicates with the cup body circuit via a coupling component. The power supply control module is used to output a stable power supply to the cup body circuit. The cup body circuit includes an MCU U7, a charging chip U5, a charging control module, and a peak current suppression module. The signal receiving pin of the MCU U7 is electrically connected to the handshake signal terminal of the coupling component. The LED1 pin of the charging chip U5 is electrically connected to the charge full pin of the MCU U7. The charging control module includes a MOSFET Q8 and a control resistor R86. The gate of the MOSFET Q8 is electrically connected to the MCU_PMOS2 pin of the MCU U7 via the resistor R86. Its source is electrically connected to the BAT terminal, and its drain is electrically connected to the VBUS terminal. The peak current suppression module is a capacitor C21 connected in parallel between the gate and source of the MOSFET Q8. The capacitor C21 and the resistor R86 suppress the peak current generated during charging by increasing the equivalent capacitance between the gate and source of the MOSFET Q8.

[0020] When the cup is correctly placed on the base, the cup circuit and the base circuit are tightly connected via the FPC interface, completing the physical connection of signals such as VCC, GND, MCU_SIGN, and HT_ON. Subsequently, the MCU U1 of the base circuit periodically sends a specifically coded MCU_SIGN handshake signal to the cup circuit via the FPC interface through its handshake signal output terminal. The MCU U7 of the cup circuit receives this signal through its signal receiving pin. If the signal is valid, it sends a confirmation signal back to MCU U1 via the same link. After receiving the confirmation signal, MCU U1 determines that the cup circuit is correctly connected, completing bidirectional handshake communication. After successful handshake communication, MCU U1 controls the MCU_PMOS1 pin to output a high-level signal, which is transmitted to the gate (G) of MOSFET Q20 via the control resistor of the power supply control module, turning on Q20. The VCC-OUT terminal of the base circuit supplies stable power to the cup circuit through the VCC power supply signal terminal of the coupling component. After detecting voltage input at the VBUS terminal, the MCU U7 of the cup circuit controls the input voltage of Q8, preparing to enter the charging state. After the charging chip U5 is started, the VBUS power supply of the cup circuit charges the lithium battery through the charging circuit. Each time charging is started, the switching smoothness of the MOSFET is increased to achieve the pre-charging condition of the capacitor at the D-level output terminal, suppressing the switching spike current and protecting the components. At the same time, the MCU U7 monitors the input voltage of the VBUS terminal through the V-chk terminal of the voltage detection module and monitors the lithium battery temperature through the NTC pin of the charging chip U5. If the voltage is abnormal or the temperature is too high, the MCU U7 immediately controls the MCU_PMOS2 pin to output a low level, turning off the MOSFET Q8, cutting off the charging circuit, and shutting down the charging chip U5 to achieve charging protection. In addition, the MCU U1 of the base circuit monitors its own input voltage through the 24V voltage detection module. If an abnormality occurs, it can shut down the power supply control module in time to stop supplying power to the cup circuit. When the lithium battery is fully charged, the LED1 pin of the charging chip U5 detects that the voltage at the BAT terminal has reached the preset value through the feedback resistor network and sends a charging completion signal to the MCU U7. After receiving the signal, the MCU U7 controls the MCU_PMOS2 pin to output a low level, turning off the MOSFET Q8, and simultaneously turns off the charging chip U5 through the MCU_EN pin, stopping the charging process. Subsequently, the MCU U7 sends a charging completion signal back to the MCU U1 through the handshake signal terminal. The MCU U1 then controls the MOSFET Q20 of the power supply control module to turn off, stopping the power supply to the cup body circuit, and the entire charging process ends.

[0021] Specifically, such as Figure 1-2As shown, the base circuit serves as the power supply hub and communication initiator of the entire system. Its core components include MCU U1, handshake signal output terminal, and power supply control module. MCU U1 is the control core of the base circuit, responsible for logic judgment, handshake signal generation, and power supply control command output. Its pins cover multiple functions such as interrupt, analog signal acquisition, and digital signal transmission, providing the hardware foundation for multi-dimensional control of the circuit. The signal output pins of MCU U1 are directly electrically connected to the handshake signal output terminal. This handshake signal output terminal establishes a communication link with the cup body circuit through a coupling component, and can periodically send a handshake signal with a specific code to confirm the connection status of the cup body circuit.

[0022] The power supply control module is used to output a stable power supply to the cup body circuit. It mainly includes a MOSFET Q20 and a control resistor. The gate (G) of MOSFET Q20 is electrically connected to the MCU_PMOS1 pin of MCU U1 via the control resistor, the source (S) is grounded, and the drain (D) is electrically connected to the VCC-OUT terminal of the base circuit. The VCC-OUT terminal is electrically connected to the cup body circuit through a coupling component. When MCU U1 outputs a high-level control signal, the control resistor limits the gate drive current of MOSFET Q20 to prevent Q20 from being damaged by a sudden large current. At the same time, it turns on Q20, and the VCC-OUT terminal supplies operating power to the cup body circuit. The specific number of this control resistor is not explicitly marked in the current base circuit schematic, but this does not affect its function. In actual applications, a resistor with a matching resistance value can be selected according to the gate drive current requirements.

[0023] The coupling components consist of a pin and a coupler. The pin (not shown in the figure) can achieve physical connection and disconnection, while the coupler (not shown in the figure) can work with the pin to achieve the corresponding electrical connection.

[0024] Corresponding to the base circuit, such as Figure 3-7 As shown, the cup body circuit is responsible for receiving power and handshake signals from the base circuit to achieve safe charging of the lithium battery. It also protects the charging components through a peak current suppression mechanism. Its core components include MCUU7, charging chip U5, charging control module, peak current suppression module, and voltage detection module. MCU U7, model SC95R503X28U, is the control core of the cup body circuit. Packaged in TSSOP28, its pins cover analog signal acquisition, PWM output, and communication functions. It can communicate bidirectionally with MCU U1 in the base circuit and control the operating status of each module in the cup body circuit. The signal receiving pin of MCU U7 is electrically connected to the handshake signal terminal of the FPC interface. It can receive and parse the handshake signal sent by MCU U1 and simultaneously feed back an acknowledgment signal, forming a stable bidirectional handshake communication link. If a valid handshake signal is not received, MCUU7 can prevent the charging module from starting, avoiding invalid power supply.

[0025] The charging chip U5 is used to achieve efficient charging and protection of lithium batteries. The model number of the charging chip U5 is IP2366. Its VBUS input pin is the main power input, which is controlled by MCU U7 to start or stop via MOSFET Q8. The LED1 pin is electrically connected to the BAT terminal of the cup body circuit through a feedback resistor network. This feedback resistor network includes resistors R14, R15, and R94, all in 0603 packages. Resistors R14 and R15 have a resistance of 1MΩ, and resistor R94 has a resistance of 1KΩ. The algorithm detects the battery voltage divider characteristics to ensure constant voltage characteristics during charging. The charging chip U5 uses an H-bridge buck-boost circuit composed of inductor L1 and Q3, Q6, Q7, and Q9 to achieve voltage regulation output across a wide input voltage range, meeting the charging characteristics of lithium batteries with a wide input range of 5V to 24V. Internally, it integrates characteristic charging control, effectively detecting the lithium battery status and adjusting the current and voltage to effectively guide the lithium battery into trickle, constant current, and constant voltage characteristics, improving charging efficiency.

[0026] The charging control module controls the on / off state of the charging circuit in the cup body circuit. It includes a MOSFET Q8 and a control resistor R86. The control resistor R86 has a resistance of 10KΩ, is packaged in a 0603, and is electrically connected at one end to the MCU_PMOS2 pin of MCU U7, and at the other end to the gate (G) of MOSFET Q8. The source (S) of MOSFET Q8 is grounded, and the drain (D) is electrically connected to the VBUS terminal of the cup body circuit. When MCU U7 outputs a high-level signal, the control resistor R86 limits the gate current of MOSFET Q8, causing Q8 to conduct and allowing power to enter the charging circuit from the VBUS terminal. When charging is complete or an abnormality occurs, MCU U7 outputs a low-level signal, Q8 is turned off, and the charging circuit is disconnected.

[0027] The peak current suppression module, consisting of capacitor C21, is used to prevent peak current from impacting components during charging. C21 is connected in parallel between the gate (G) and source (S) terminals of MOSFET Q8. The capacitance of C21 is ≤10μF, the package type is 0603-X7R, and the withstand voltage is not less than 50V, exhibiting both good temperature stability and voltage tolerance. When MOSFET Q8 turns on, its gate voltage rises rapidly, and parasitic capacitance and stray inductance in the circuit can easily generate peak current. Increasing the parasitic capacitance between the gate and source terminals delays the MOSFET's turn-on time, mitigating the short circuit caused by the instantaneous charging of the D-stage capacitor network due to the MOSFET's instantaneous turn-on. This pre-charging effect suppresses the amplitude of the peak current, protecting MOSFET Q8 and surrounding components from damage.

[0028] The voltage detection module is used to monitor the input voltage of the cup body circuit. It includes a resistor R53 and a voltage detection terminal V-chk. The resistor R53 has a resistance of 1KΩ, is packaged in a 0603 package, and is electrically connected at one end to the VBUS terminal of the cup body circuit and at the other end to the voltage detection terminal V-chk. The voltage detection terminal V-chk is electrically connected to the AIN pin of the MCU U7. The MCU U7 acquires the voltage signal of the voltage detection terminal V-chk through the AIN pin and judges in real time whether the input voltage of the VBUS terminal is normal. If an abnormal voltage occurs, it can control the charging control module to shut down in time to ensure the safety of the charging circuit. In addition, the FPC interface serves as a bridge connecting the base circuit and the cup body circuit, transmitting signals including VCC power supply signal, GND ground signal, MCU_SIGN handshake signal, and HT_ON load control signal. Among them, the VCC power supply signal provides operating power to the cup body circuit, the GND ground signal ensures circuit potential stability, the MCU_SIGN handshake signal enables bidirectional communication, and the HT_ON load control signal can be used to control the operation of the load (such as the heating element) in the cup body. The coordinated transmission of multiple signals ensures the stable operation of the entire system.

[0029] Compared with the prior art, this utility model ensures the accuracy of device connection and the reliability of communication through a two-way handshake communication mechanism between the base circuit and the cup body circuit; through the peak current suppression module between the GS and G terminals of the MOS transistor in the cup body circuit, it effectively avoids damage to components by charging peak current, further improving the safety and stability of the charging process and extending the service life of the device.

[0030] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An operating circuit for a power supply component for separate communication, characterized in that, It includes a base circuit and a cup body circuit, which are detachably connected via a coupling component; The base circuit includes an MCU U1, a power supply control module, and a handshake signal output terminal. The signal output pin of the MCU U1 is electrically connected to the handshake signal output terminal. The handshake signal output terminal communicates with the cup body circuit via a coupling component. The power supply control module is used to output a stable power supply to the cup body circuit. The cup body circuit includes an MCU U7, a charging chip U5, a charging control module, and a peak current suppression module. The signal receiving pin of the MCU U7 is electrically connected to the handshake signal terminal of the coupling component. The LED1 pin of the charging chip U5 is electrically connected to the charge full pin of the MCU U7. The charging control module includes a MOSFET Q8 and a control resistor R86. The gate of the MOSFET Q8 is electrically connected to the MCU_PMOS2 pin of the MCU U7 via the resistor R86. Its source is electrically connected to the BAT terminal, and its drain is electrically connected to the VBUS terminal. The peak current suppression module is a capacitor C21 connected in parallel between the gate and source of the MOSFET Q8. The capacitor C21 and the resistor R86 suppress the peak current generated during charging by increasing the equivalent capacitance between the gate and source of the MOSFET Q8.

2. The operating circuit according to claim 1, characterized in that, The MCU U1 sends an MCU_SIGN handshake signal to the cup body circuit through the handshake signal output terminal, and the MCU U7 receives the signal through the handshake signal receiver terminal and feeds back a response signal, thereby realizing bidirectional handshake communication between the cup body circuit and the base circuit.

3. The operating circuit according to claim 1, characterized in that, The MCU U1 and the MCU U7 communicate with each other via the TXD / RXD pin or the SDA / SCL pin.

4. The operating circuit according to claim 1, characterized in that, The capacitor C21 of the peak current suppression module has a capacitance range of ≤10μF and a withstand voltage of not less than 50V.

5. The operating circuit according to claim 1, characterized in that, The power supply control module of the base circuit includes a MOSFET Q20 and a control resistor. The gate of the MOSFET Q20 is electrically connected to the MCU_PMOS1 pin of the MCU U1 via the control resistor, the source is grounded, and the drain is electrically connected to the VCC-OUT terminal of the base circuit. The VCC-OUT terminal supplies power to the cup circuit via a coupling component.

6. The operating circuit according to claim 1, characterized in that, The FPC interface is a surface mount header, and the cup body circuit and the base circuit realize bidirectional transmission of VCC, GND, MCU_SIGN, and HT_ON signals through the FPC interface.

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