Control method of wireless charging function

Abstract

The invention provides a control method of a wireless charging function. The control method comprises the following steps that a wireless charging controller of a wireless charging receiving end carries out initialization operation; waiting for a detection signal sent by the wireless charging transmitting end; when the wireless charging transmitting end and the wireless charging receiving end detect an energy field, the wireless charging transmitting end and the wireless charging receiving end start to communicate according to a wireless charging protocol; the wireless charging transmitting end begins to transmit electric energy to the wireless charging receiving end; a main charging management chip of the wireless charging receiving end continuously reads charging parameters through an I2C bus, and monitors whether a stable charging event occurs or not in real time; when the state is a stable charging event, the main charging management chip starts wireless charging; a wireless charging controller of the wireless charging receiving end adjusts a corresponding charging parameter according to a charging power protocol; and the main charging management chip of the wireless charging receiving end obtains the charging state and monitors the actual charging current value in real time until the charging is completed. The beneficial effects are that charging parameters can be dynamically adjusted and safety incidents can be avoided.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, and more specifically to a control method for wireless charging functionality. Background Technology

[0002] For smartphones, wireless charging has gradually become a standard feature in many flagship and mid-to-high-end models. Currently, mainstream smartphone wireless charging technology is primarily based on the physical principle of electromagnetic induction. Almost all smartphones on the market use this technology. Its working principle utilizes Faraday's law of electromagnetic induction: a high-frequency alternating current is passed through the charger coil to generate a magnetic field. The phone's coil senses this change in the magnetic field and generates a current, which is then rectified and regulated to become direct current for charging. Simply put, it combines the phone and the charging dock into a small "transformer."

[0003] While existing wireless charging technologies can achieve charging, they cannot monitor the charging status in real time and dynamically adjust charging parameters to optimize charging efficiency and reduce heat generation. At the same time, they cannot monitor the charging process for safety, which poses safety hazards and fails to meet user needs, thus hindering the improvement of product competitiveness. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides a control method for wireless charging.

[0005] The present invention provides a control method for a wireless charging function, comprising the following steps: Step S1: The wireless charging controller of the wireless charging receiver performs initialization operations. Step S2: After the initialization operation is completed, the wireless charging controller enters the low-power listening mode and waits for the detection signal sent by the wireless charging transmitter. Step S3: When the wireless charging transmitter attempts digital communication, once the wireless charging transmitter and the wireless charging receiver detect the energy field, they begin to communicate according to the wireless charging protocol. The wireless charging receiver parses the data packets sent by the wireless charging transmitter, and the handshake between the wireless charging transmitter and the wireless charging receiver is successful. Step S4: After the wireless charging transmitter and the wireless charging receiver successfully handshake, the wireless charging transmitter begins to transmit power to the wireless charging receiver, and the main charging management chip of the wireless charging receiver takes over the charging process. Step S5: The main charging management chip of the wireless charging receiver continuously reads the charging parameters through the I2C bus and monitors in real time whether the charging is stable. Step S6: When the wireless charging transmitter and the wireless charging receiver successfully handshake and the status is stable charging event, the wireless charging controller of the wireless charging receiver notifies the main charging management chip to start wireless charging. Step S7: The wireless charging controller of the wireless charging receiver automatically determines the charging power protocol of the wireless charging transmitter and adjusts the corresponding charging parameters according to the charging power protocol. Step S8: The main charging management chip of the wireless charging receiver obtains the charging status from the status register through the I2C bus and monitors the actual charging current value in real time to determine whether the current value is lower than the cutoff current. Step S9: When the charging status obtained by the status register is "charging complete" and the current value is lower than the cutoff current, the charging is complete.

[0006] The present invention is further improved in that the initialization operation in step S1 includes initializing the I2C interface, requesting GPIO interrupt, creating the power subsystem, creating the debug node, and updating the firmware.

[0007] The present invention is further improved in that, in step S5, the reading of charging parameters includes the coil voltage value and the coil current value.

[0008] The present invention is further improved, and the specific steps for real-time monitoring of whether a stable charging event is occurring in step S5 are as follows: Step A1: Determine if the coil voltage is overvoltage, determine if the coil current is overcurrent, and determine if there are any metallic foreign objects. Step A2: When an overvoltage, overcurrent, or metal foreign object is detected in the coil, the wireless charging controller of the wireless charging receiver sends a stop charging data packet to the wireless charging transmitter, or the wireless charging controller of the wireless charging receiver directly cuts off the internal power output.

[0009] In a further improvement to this invention, in step S6, after wireless charging is started, the wireless charging controller of the wireless charging receiver will start a timed cycle. Every second, it will send a command to the main charging management chip via the I2C bus to increase the IBUS current setting value by 100mA until the IBUS current reaches 1A.

[0010] In a further improvement to this invention, in step S6, after wireless charging is started, the wireless charging controller of the wireless charging receiver dynamically adjusts the wireless charging current value when the LCD screen is on or off. When the screen goes from on to off, the wireless charging current value increases by 100mA; when the screen goes from off to on, the wireless charging current value decreases by 100mA.

[0011] The present invention is further improved in step S6. After wireless charging is started, the wireless charging scene mode is determined. In the power-off state, the wireless charging current value increases by 100mA every second until the IBUS current reaches 1A. In the power-on state, the wireless charging current value increases by 100mA every 3 seconds until the IBUS current reaches 500mA, and then increases by 100mA every second until the IBUS current reaches 1A. In the power-on process, the wireless charging current value first increases by 100mA every second until the power-on state is recognized, and then the wireless charging current value increases by 100mA every 3 seconds until the IBUS current reaches 1A.

[0012] The present invention is further improved in that, in step S7, the charging power protocol includes a basic power protocol and an enhanced power protocol. When it is determined to be a basic power protocol, the wireless charging controller of the wireless charging receiver adjusts the current value flowing into the battery to 1A and sets the corresponding cut-off charging current according to this protocol. When it is determined to be an enhanced power protocol, the wireless charging controller of the wireless charging receiver adjusts the current value flowing into the battery to 2A and sets the corresponding cut-off charging current according to this protocol.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a control method for wireless charging function, which can effectively solve the problem that the charging technology in the prior art cannot monitor the charging status and safety in real time. By using this method, the wireless charging transmitter and the wireless charging receiver communicate in real time. At the same time, during the charging process, the wireless charging receiver continuously reads the charging parameters, listens in real time to whether the charging event is stable, dynamically adjusts the charging parameters and avoids the occurrence of safety events, which can meet the user's needs and improve the competitiveness of the product. Attached Figure Description

[0014] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a flowchart of a control method for a wireless charging function according to the present invention. Detailed Implementation

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0019] This invention provides a control method for wireless charging function, such as... Figure 1 As shown, this method is used in the above system. The detailed implementation method for controlling the wireless charging function in this example is as follows: 1. The wireless charging controller at the wireless charging receiver performs initialization operations.

[0020] Initialization operations include initializing the I2C interface, requesting GPIO interrupts, creating the power subsystem, creating debug nodes, and updating firmware.

[0021] The initialization settings facilitate subsequent I2C read / write operations and request GPIO interrupts. When in contact with the transmitter disk, an interrupt will be generated, thus initiating the next handshake operation with the transmitter.

[0022] Create a power subsystem to broadcast charging status events to the wireless charging controller at the wireless charging receiver, and create a debug node to facilitate subsequent debugging.

[0023] Upgrading the firmware (updating the GPIO and register settings of the main charging management chip) is achieved through an I2C loader.

[0024] 2. After initialization, the wireless charging controller enters low-power monitoring mode and waits for the detection signal sent by the wireless charging transmitter.

[0025] 3. When the wireless charging transmitter attempts digital communication, once the wireless charging transmitter and the wireless charging receiver detect the energy field, they begin to communicate according to the wireless charging protocol. The wireless charging receiver parses the data packets sent by the wireless charging transmitter, and the handshake between the wireless charging transmitter and the wireless charging receiver is successful.

[0026] Once both the wireless charging transmitter and receiver have confirmed the energy field, they will begin formal communication according to the WPC Qi protocol standard specifications.

[0027] The wireless charging receiver receives FSK (Frequency Shift Keying) modulation commands sent by the wireless charging transmitter, and at the same time, the wireless charging receiver uses ASK (Amplitude Shift Keying) modulation to send control error, signal strength packets and other data to the wireless charging transmitter.

[0028] Only after the receiving end correctly acquires and processes these data packets will the main charging management chip of the wireless charging receiver activate the MLDO (Power Management Module), ultimately achieving a successful handshake between the wireless charging transmitter and the wireless charging receiver.

[0029] The wireless charging transmitter is responsible for sending Ping signals to detect the wireless charging receiver, transmitting commands via FSK modulation, and maintaining the stability of the energy field.

[0030] The wireless charging receiver is responsible for parsing FSK modulation commands and sending ASK response data.

[0031] 4. After the wireless charging transmitter and the wireless charging receiver successfully handshake, the wireless charging transmitter begins to transmit power to the wireless charging receiver, and the main charging management chip of the wireless charging receiver takes over the charging process.

[0032] 5. The main charging management chip of the wireless charging receiver continuously reads charging parameters through the I2C bus and monitors in real time whether the charging is stable.

[0033] The wireless charging transmitter is primarily responsible for providing energy, while the wireless charging receiver manages the reception and use of that energy. This setup enables intelligent management of the charging process, preventing damage to the device due to abnormal voltage or current.

[0034] The charging parameters to be read include the coil voltage and coil current values.

[0035] By analyzing this real-time data, the system can determine whether it is currently in a normal charging state. Once an anomaly is detected, the corresponding error handling mechanism will be triggered, and charging will be terminated if necessary.

[0036] The specific steps for real-time monitoring of whether a stable charging event is occurring are as follows: (1) Determine whether the coil voltage is overvoltage, whether the coil current is overcurrent, and whether there are any metallic foreign objects. (2) When the coil voltage is found to be overvoltage, the coil current is overcurrent, or there is a metal foreign object, the wireless charging controller of the wireless charging receiver sends a stop charging data packet to the wireless charging transmitter or the wireless charging controller of the wireless charging receiver directly cuts off the internal power output.

[0037] By determining whether a stable charging event is occurring, contingency plans can be prepared for potential errors and charging termination.

[0038] Metal foreign object detection can prevent metal foreign objects from causing charging loss or affecting the heat generation during the charging process, thus avoiding potential safety hazards during charging.

[0039] 6. When the wireless charging transmitter and the wireless charging receiver successfully handshake and the status is stable charging event, the wireless charging controller of the wireless charging receiver notifies the main charging management chip to start wireless charging.

[0040] After wireless charging is started, the wireless charging controller at the wireless charging receiver will start a timed cycle. Every second, it will send a command to the main charging management chip via the I2C bus to increase the IBUS current setting value by 100mA until the IBUS current reaches 1A.

[0041] For example: 0mA → 100mA → 200mA → 300mA... and so on, gradually increasing.

[0042] When the IBUS current reaches the preset 1A upper limit, it stops increasing and enters a stable normal charging state.

[0043] The gradual current regulation strategy employed in the wireless charging receiver aims to ensure a smooth and safe charging process, avoiding current surges. A direct jump from 0A to 1A could trigger the system's overcurrent protection, causing charging interruption. Gradual current increases effectively prevent this problem while protecting the system. This provides a buffer and adaptation period for the phone's internal power management circuitry and battery, preventing voltage drops or component damage due to excessive instantaneous load, thus improving charging safety.

[0044] Meanwhile, after wireless charging is activated, the wireless charging controller at the wireless charging receiver dynamically adjusts the wireless charging current value when the LCD screen is on or off. When the screen goes from on to off, the wireless charging current value increases by 100mA; when the screen goes from off to on, the wireless charging current value decreases by 100mA.

[0045] Meanwhile, after wireless charging is started, the wireless charging scenario mode is determined. In the power-off state, the wireless charging current value increases by 100mA every second until the IBUS current reaches 1A. In the power-on state, the wireless charging current value increases by 100mA every 3 seconds until the IBUS current reaches 500mA, and then increases by 100mA every second until the IBUS current reaches 1A. During the power-on process, the wireless charging current value first increases by 100mA every second until the power-on state is recognized, and then increases by 100mA every 3 seconds until the IBUS current reaches 1A.

[0046] Meanwhile, after wireless charging is started, the temperature sensor built into the wireless charging controller of the wireless charging receiver monitors the temperature changes in real time during the charging process. When the temperature reaches 45℃, the system will automatically limit the charging current to 500mA to avoid damage to the battery or charger due to overheating.

[0047] When the temperature rises further to 55°C, the system will issue a high-temperature warning and stop charging to prevent the battery from overheating. If the temperature exceeds 60°C, the system will force a shutdown, completely cutting off the power supply to ensure device safety.

[0048] Real-time monitoring of charging temperature changes, and multi-level current limiting and shutdown protection, prevent the risk of chemical reactions or fires caused by high temperatures in the battery.

[0049] 7. The wireless charging controller at the wireless charging receiver automatically determines the charging power protocol of the wireless charging transmitter and adjusts the corresponding charging parameters according to the charging power protocol.

[0050] By automatically adjusting various key parameters of the charger, safe and efficient charging can be achieved.

[0051] The types of charging power protocols include basic power protocols and enhanced power protocols. When the protocol is determined to be a basic power protocol, the wireless charging controller at the wireless charging receiver adjusts the current flowing into the battery to 1A and sets the corresponding cutoff charging current according to the protocol. When the protocol is determined to be an enhanced power protocol, the wireless charging controller at the wireless charging receiver adjusts the current flowing into the battery to 2A and sets the corresponding cutoff charging current according to the protocol.

[0052] The wireless charging receiver system gradually increases the IBUS current input from the charger according to preset steps and time intervals to avoid sudden current surges that could damage the device.

[0053] Basic power protocols typically refer to standard 5W wireless charging; enhanced power protocols support higher power, such as 10W or 15W.

[0054] 8. The main charging management chip of the wireless charging receiver obtains the charging status from the status register through the I2C bus and monitors the actual charging current value in real time to determine whether the current value is lower than the cutoff current.

[0055] 9. When the charging status obtained by the status register is "charging complete" and the current value is lower than the cutoff current, the charging is complete.

[0056] As can be seen from the above, the present invention provides a control method for wireless charging function, which can effectively solve the problem that existing charging technologies cannot monitor the charging status and safety in real time. By using this method, the wireless charging transmitter and the wireless charging receiver communicate in real time. At the same time, during the charging process, the wireless charging receiver continuously reads the charging parameters, listens in real time to whether the charging is stable, dynamically adjusts the charging parameters and avoids the occurrence of safety events, which can meet the user's needs and improve the competitiveness of the product.

[0057] The specific embodiments described above are preferred embodiments of the present invention and are not intended to limit the specific scope of the present invention. The scope of the present invention includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A control method of a wireless charging function, characterized by, The method comprises the following steps: Step S1: the wireless charging controller of the wireless charging receiving end performs initialization operation; Step S2: after the initialization operation is completed, the wireless charging controller enters a low-power listening mode and waits for a detection signal sent by the wireless charging transmitting end; Step S3: when the wireless charging transmitting end attempts digital communication, the wireless charging transmitting end and the wireless charging receiving end start communication according to the wireless charging protocol as soon as the energy field is detected, the wireless charging receiving end analyzes the data packet sent by the wireless charging transmitting end, and the handshake between the wireless charging transmitting end and the wireless charging receiving end is successful; Step S4: after the handshake between the wireless charging transmitting end and the wireless charging receiving end is successful, the wireless charging transmitting end starts to transmit electric energy to the wireless charging receiving end, and the main charging management chip of the wireless charging receiving end takes over the charging process; Step S5: the main charging management chip of the wireless charging receiving end constantly reads the charging parameters through the I2C bus and real-time monitors whether the stable charging event is in progress; Step S6: when the handshake between the wireless charging transmitting end and the wireless charging receiving end is successful and the state is in the stable charging event, the wireless charging controller of the wireless charging receiving end informs the main charging management chip to start wireless charging; Step S7: the wireless charging controller of the wireless charging receiving end automatically judges the charging power protocol of the wireless charging transmitting end and adjusts the corresponding charging parameters according to the charging power protocol; Step S8: the main charging management chip of the wireless charging receiving end obtains the charging state from the state register through the I2C bus and real-time monitors the actual charging current value to judge whether the current value is lower than the cutoff current; Step S9: when the charging state obtained by the state register is charging completion and the current value is lower than the cutoff current, the charging is completed. 2.The control method of a wireless charging function according to claim 1, characterized in that: The initialization operation in the step S1 comprises initializing the I2C interface, applying the GPIO interrupt, creating the power supply subsystem, creating the debugging node and the firmware update. 3.The control method of a wireless charging function according to claim 1, characterized in that: For the step S5, the reading of the charging parameters comprises the coil voltage value and the coil current value. 4.The control method of a wireless charging function according to claim 3, characterized in that: The specific steps of the real-time monitoring of whether the stable charging event is in progress in the step S5 are as follows: Step A1: judging whether the coil voltage value is overvoltage, judging whether the coil current value is overcurrent and judging whether there is metal foreign matter; Step A2: when the coil voltage value is found to be overvoltage, the coil current value is found to be overcurrent or there is metal foreign matter, the wireless charging controller of the wireless charging receiving end sends a stop charging data packet to the wireless charging transmitting end or directly cuts off the internal power supply output. 5.The control method of a wireless charging function according to claim 1, characterized in that: In the step S6, after the wireless charging is started, the wireless charging controller of the wireless charging receiving end starts a timing cycle, and every 1 second, the setting value of the IBUS current is increased by 100 mA through the I2C bus to the main charging management chip until the IBUS current reaches 1 A. 6.The control method of a wireless charging function according to claim 1, characterized in that: In the step S6, after the wireless charging is started, for the LCD screen on and off, the wireless charging controller of the wireless charging receiving end dynamically adjusts the wireless charging current value, and when the screen is turned on to off, the wireless charging current value is increased by 100 mA; and when the screen is turned off to on, the wireless charging current value is decreased by 100 mA. 7.The control method of a wireless charging function according to claim 1, characterized in that: In the step S6, after starting the wireless charging, it is judged the wireless charging scene mode. In the power-off state, the wireless charging current value is increased by 100 mA every 1 second until the IBUS current reaches 1 A. In the power-on state, the wireless charging current value is increased by 100 mA every 3 seconds until the IBUS current reaches 500 mA, and then increased by 100 mA every 1 second until the IBUS current reaches 1 A. In the power-on process state, the wireless charging current value is first increased by 100 mA every 1 second until the power-on state is recognized, and then increased by 100 mA every 3 seconds until the IBUS current reaches 1 A.

8. The control method of a wireless charging function according to any one of claims 1-7, characterized in that: In the step S7, the kind of the charging power protocol includes a basic power protocol and an enhanced power protocol. When the basic power protocol is judged, the wireless charging controller of the wireless charging receiving end adjusts the current value flowing into the battery to 1 A, and sets the corresponding cut-off charging current according to the protocol. When the enhanced power protocol is judged, the wireless charging controller of the wireless charging receiving end adjusts the current value flowing into the battery to 2 A, and sets the corresponding cut-off charging current according to the protocol.

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