Wireless charging circuit, wireless charging chip and electronic equipment

Abstract

The utility model provides a wireless charging circuit, a wireless charging chip and electronic equipment. The wireless charging circuit comprises a power supply circuit. And the wake-up circuit is connected with the power supply circuit and sends a wake-up signal to the power supply circuit under the condition that a wake-up condition is met. Through the wireless charging circuit provided by the invention, the power consumption of wireless charging receiving end detection can be reduced, and the applicability to a scene in which a battery is used for wireless charging can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless charging, and in particular, to a wireless charging circuit, a wireless charging chip, and an electronic device. Background Art

[0002] The Qi wireless charging communication protocol is a "wireless charging" standard launched by the Wireless Power Consortium (WPC). The protocol defines four stages: Selection, Ping, Identification & Configuration, and Power Transfer.

[0003] In related technologies, the wireless charging transmitter needs to periodically send signals to detect the receiver. The transmitter being in a standby detection state for a long time will cause more power consumption. Therefore, there are also higher requirements for the power consumption of the wireless charging receiver detection in such scenarios. However, the power consumption of the current wireless charging receiver detection needs to be further reduced. Summary of the Utility Model

[0004] To overcome the problems existing in related technologies, the present disclosure provides a wireless charging circuit, a wireless charging chip, and an electronic device.

[0005] According to a first aspect of an embodiment of the present disclosure, a wireless charging circuit is provided, including a power supply circuit; a wake-up circuit connected to the power supply circuit and sending a wake-up signal to the power supply circuit when a wake-up condition is satisfied.

[0006] In one implementation, the wake-up circuit includes a wake-up detection circuit, a drive circuit, and a resonance circuit; wherein the wake-up detection circuit is connected to the power supply circuit, the drive circuit, and the resonance circuit; the drive circuit is connected to the resonance circuit.

[0007] In one implementation, the wake-up detection circuit includes: a first pin, a first sub-circuit, a detection module, and a control module; the first pin is connected to the power supply circuit, and the first pin is respectively connected to the first sub-circuit, the detection module, and the control module; wherein the first sub-circuit includes a bandgap reference BG.

[0008] In one implementation, the driving circuit includes: a driving controller, a switch control circuit, and a first bias power supply; wherein, the switch control circuit includes a first transistor, a second transistor, a third transistor, and a fourth transistor; the input ends of the first transistor and the third transistor are connected to the first bias power supply; the control ends of the first transistor, the second transistor, the third transistor, and the fourth transistor are connected to the driving controller; the output end of the first transistor is connected to the input end of the second transistor, and the output end of the third transistor is connected to the input end of the fourth transistor; the output ends of the second transistor and the fourth transistor are grounded.

[0009] In one implementation, the resonant circuit includes a capacitor and an inductor, wherein one end of the capacitor is connected to the driving circuit, and the other end is connected to the inductor and the wake-up detection circuit; the inductor is connected to the driving circuit.

[0010] In one implementation, one end of the capacitor is connected to the output end of the third transistor or the input end of the fourth transistor; the other end of the capacitor is connected to the inductor and the detection module; the inductor is connected to the output end of the first transistor or the input end of the second transistor.

[0011] In one implementation, the power supply circuit includes a power input end and a voltage regulator connected to the power input end.

[0012] In one implementation, the circuit further includes a second bias power supply, and the second bias power supply is connected to the voltage regulator and the first pin.

[0013] According to a second aspect of the embodiments of the present disclosure, there is provided a wireless charging chip, including the wireless charging circuit described in the first aspect or any one of the implementations of the first aspect.

[0014] According to a third aspect of the embodiments of the present disclosure, there is provided an electronic device, including: a wireless charging chip, including the wireless charging circuit described in the first aspect or any one of the implementations of the first aspect.

[0015] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: separating the circuit for waking up the wireless charging receiving end from the power supply circuit of the wireless charging transmitting end, the wake-up circuit can independently detect the receiving end without starting the entire wireless charging circuit, and the power supply circuit enters the working state only after receiving the wake-up signal sent by the detection circuit, thereby reducing the power consumption of the receiving end detection in wireless charging.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Brief Description of the Drawings

[0017] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0018] Figure 1 is a schematic diagram showing the communication principle of wireless charging according to an exemplary embodiment.

[0019] Figure 2 is a schematic diagram showing the communication process of wireless charging according to an exemplary embodiment.

[0020] Figure 3 is a timing diagram of a signal for ping detection according to an exemplary embodiment.

[0021] Figure 4 is a timing diagram of another signal for ping detection according to an exemplary embodiment.

[0022] Figure 5 is a schematic diagram showing the architecture of a wireless charging circuit chip according to an exemplary embodiment.

[0023] Figure 6 is a schematic diagram showing the process of detecting the receiving end of an analog ping signal according to an exemplary embodiment.

[0024] Figure 7 is a schematic diagram showing the structure of a wireless charging circuit according to an exemplary embodiment.

[0025] Figure 8 is a schematic diagram showing the structure of a wake-up circuit in a wireless charging circuit according to an exemplary embodiment.

[0026] Figure 9 is a schematic diagram showing the structure of a wake-up detection circuit in a wireless charging circuit according to an exemplary embodiment.

[0027] Figure 10 is a schematic diagram showing the structure of a drive circuit in a wireless charging circuit according to an exemplary embodiment.

[0028] Figure 11 is a schematic diagram showing the structure of a resonant circuit in a wireless charging circuit according to an exemplary embodiment.

[0029] Figure 12 is a schematic diagram showing the structure of a power supply circuit in a wireless charging circuit according to an exemplary embodiment.

[0030] Figure 13It is a schematic structural diagram of a wireless charging circuit shown according to an exemplary embodiment.

[0031] Figure 14 It is a schematic diagram of an electronic device shown according to an exemplary embodiment.

[0032] Figure 15 It is a block diagram of a device for wireless charging shown according to an exemplary embodiment. Detailed implementation manners

[0033] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure.

[0034] The technical solution of the present disclosure is applied to the wireless charging technology scenario. The wireless charging system in this scenario includes a wireless charging transmitter and a wireless charging receiver. Among them, the wireless charging transmitter is used to charge a wireless charging receiver device with wireless charging function. For example, the wireless charging transmitter device can be a wireless charging mobile power supply, a wireless charging board, a wireless charger, etc., and can also be a mobile terminal device with reverse charging function that uses a battery for wireless charging.

[0035] Wireless Charging Technology refers to the technology that realizes non-contact power transmission through air medium by means of electromagnetic induction, electromagnetic resonance, radio frequency, microwave, laser, etc. instead of through wires. Compared with traditional wired charging, wireless charging technology has higher convenience because it does not require wiring.

[0036] In the following embodiments of the present disclosure, the electromagnetic induction technology is mainly used as an example for illustration, but it is not a further limitation to the present disclosure.

[0037] For the convenience of understanding, the communication principle and communication process of wireless charging technology are specifically described below.

[0038] Figure 1 It is a schematic diagram showing the communication principle of wireless charging according to an exemplary embodiment. As Figure 1 shown, the wireless charging communication system mainly includes a wireless charging transmitter and a wireless charging receiver. The communication principle of wireless charging is mainly that the wireless charging receiver provides communication information to the wireless charging transmitter through the AC load modulation method, and the wireless charging transmitter then demodulates the corresponding communication information. For example, see Figure 1, the wireless charging receiver sends information to the wireless charging transmitter through the communication module. The communication information may include an energy demand packet, a received energy packet, a received rated power packet, a charging instruction packet, etc. The wireless charging transmitter receives the information through the communication module, generates a system instruction through the control module, and then the wireless charging transmitter transfers energy to the power receiving module of the wireless charging receiver through the power conversion module according to the system instruction. The wireless charging receiver receives the energy signal, performs load modulation through the control module, and transfers the modulation information to the wireless charging transmitter. The wireless charging transmitter demodulates the communication signal from the energy signal to complete the subsequent overall system control. Among them, there are certain connections between the above-mentioned modules to achieve the control of the entire wireless charging communication system, which will not be described one by one in the embodiments of the present disclosure.

[0039] Figure 2 is a schematic diagram showing the communication process of wireless charging according to an exemplary embodiment. As Figure 2 shown, the Qi wireless charging communication protocol is the "wireless charging" standard launched by the Wireless Power Consortium (WPC). The protocol defines four stages: Selection, Ping, Identification & Configuration, and Power Transfer.

[0040] It should be noted that there are two situations in the ping stage. In one situation, the signal detected by the ping is as Figure 3 shown, Figure 3 is a timing diagram of a ping detection signal shown according to an exemplary embodiment. The wireless charging transmitter sends a digital ping signal, and t1 represents the duration of the digital ping signal. The mobile terminal responds with a signal strength indication packet within a specified time, and t2 represents the duration of the signal strength packet. Among them, the specified time can be preset, and t2 is less than the specified time, that is, the wireless charging transmitter receives the signal strength indication packet within the specified time and enters the next stage. In the other situation, the signal detected by the ping is as Figure 4 shown, Figure 4 is a timing diagram of another ping detection signal shown according to an exemplary embodiment. The wireless charging transmitter sends a digital ping signal, and t1 represents the duration of the digital ping signal. The mobile terminal does not respond with a signal strength indication packet within the specified time, and t3 represents the duration of waiting to receive the signal strength packet until the reception is terminated. Among them, t3 is greater than or equal to the specified time, that is, the wireless charging transmitter does not receive the signal strength indication packet within the specified time, then it will not enter the next stage, and after a period of time, the wireless charging transmitter resends the digital ping signal.

[0041] Based on the above, it can be known that the wireless charging transmitter will regularly send digital ping signals to perform a handshaking operation with the wireless charging receiver, so as to enter the next charging stage. In this process, if the wireless charging transmitter does not receive a signal strength indication packet within the specified time, it will not enter the next stage, and after a period of time, the wireless charging transmitter will resend the digital ping signal. Since the process of sending digital ping signals always consumes energy, especially in battery-powered application scenarios, it will greatly increase the power consumption of the wireless charging transmitter.

[0042] In related solutions, an analog ping signal is used, and the presence of a receiver is determined by starting detection at regular intervals through software.

[0043] Figure 5 is a schematic diagram of a wireless charging circuit chip architecture shown according to an exemplary embodiment. As Figure 5 shown, in medium and low power application scenarios, the wireless charging transmitter mostly uses a highly integrated SOC (System on Chip) to implement. The SOC integrates modules such as a chip power supply unit, a microcontroller unit (MCU), and a power stage.

[0044] Among them, the chip power supply unit provides power supply for the entire wireless transmission system to ensure that each component operates at a normal working voltage. The MCU microcontroller unit is used to control and manage the various functions of the wireless charging transmitter system. The power stage is the part responsible for actual energy transmission and can be used to adjust the transmission power, etc.

[0045] Figure 6 is a schematic diagram of a process for detecting a receiver using an analog ping signal shown according to an exemplary embodiment. As Figure 6 shown, the MCU controls the power stage to periodically detect the analog ping signal of the wireless charging receiver. When the detected parameter changes or the number of times of sending the analog ping signal exceeds the set threshold, the MCU controls the power stage to perform a digital ping detection. If the receiver is detected through the digital ping signal, the wireless charging transmitter enters the power transmission mode.

[0046] The method of using an analog ping signal can reduce the power consumption of detecting the receiver to a certain extent. However, in actual applications, especially in medium and low power application scenarios, the power consumption of detecting the wireless charging receiver still needs to be further reduced.

[0047] In view of this, an embodiment of the present disclosure proposes a wireless charging circuit.

[0048] It should be understood that the present disclosure is not limited to the exact structures described in the embodiments and shown in the drawings, and various modifications and changes can be made without departing from its scope.

[0049] Figure 7 is a schematic diagram of the structure of a wireless charging circuit shown according to an exemplary embodiment. As Figure 7 shown, the wireless charging circuit 100 includes a power supply circuit 101 and a wake-up circuit 102.

[0050] Among them, the power supply circuit 101 can provide power supply for the entire wireless transmission system. It may include a microcontroller unit and a power stage module.

[0051] The wake-up circuit 102 is connected to the power supply circuit 101 and is used to send a wake-up signal to the power supply circuit when the wake-up condition is met.

[0052] Among them, the wake-up signal is used to send a wake-up signal to the power supply circuit when the wake-up circuit detects that the wireless charging receiver is in place, so as to wake up the power supply circuit, enable the power supply circuit to provide power supply for the microcontroller unit and the power stage module, and further switch the microcontroller unit and the power stage module from a state of stopping working or having a power consumption lower than the threshold to a working state.

[0053] In the embodiment of the present disclosure, when the wake-up circuit 102 detects that the wireless charging receiver is in place, it can send a wake-up signal to the power supply circuit 101. Among them, the wake-up signal is used to prompt the power supply circuit 101 to supply power to the microcontroller unit and the power stage module.

[0054] In the embodiment of the present disclosure, when the power supply circuit 101 receives the wake-up signal sent by the wake-up circuit 102, it supplies power to the microcontroller unit and the power stage module, so that the microcontroller unit and the power stage module are switched from a state of stopping working or having a power consumption lower than the threshold to a working state. It can be understood that the microcontroller unit and the power stage module can be switched from a state of stopping working or having a power consumption lower than the threshold to a working state based on the received wake-up signal.

[0055] In the implementation of the present disclosure, when detecting the wireless charging receiver in standby, only the wake-up circuit 102 can be set to be in a working state, so as to reduce the power consumption of wireless charging receiver detection and improve the applicability to the scenario of wireless charging using a battery.

[0056] In the embodiments of the present disclosure, the circuit for waking up the wireless charging receiver is separated from the power supply circuit of the wireless charging transmitter. The detection circuit can independently detect the receiver without starting the entire wireless charging circuit. The power supply circuit enters the working state only after receiving the wake-up signal sent by the detection circuit, thereby reducing the power consumption of the receiver detection in wireless charging.

[0057] Figure 8 FIG. is a schematic diagram of the structure of a wake-up circuit in a wireless charging circuit according to an exemplary embodiment. As Figure 8 shown, the wake-up circuit 102 includes a wake-up detection circuit 103, a drive circuit 104, and a resonance circuit 105.

[0058] Among them, the wake-up detection circuit 103 is connected to the power supply circuit 101, the drive circuit 104, and the resonance circuit 105.

[0059] Among them, the drive circuit is connected to the resonance circuit.

[0060] In the embodiments of the present disclosure, the wake-up detection circuit can be used to detect whether the wireless charging receiver is in place.

[0061] Among them, Figure 9 FIG. is a schematic diagram of the structure of a wake-up detection circuit in a wireless charging circuit according to an exemplary embodiment. As Figure 9 shown, the wake-up detection circuit 103 includes a first pin, a first sub-circuit, a detection module, and a control module.

[0062] Among them, the first pin is connected to the power supply circuit 101, and the first pin is respectively connected to the first sub-circuit, the detection module, and the control module.

[0063] Among them, the first sub-circuit includes a bandgap reference BG.

[0064] In the embodiments of the present disclosure, the detection module can be used to periodically detect the Q-value parameter. The control module can be used to calculate the Q-value according to the Q-value parameter detected by the detection module and perform in-place detection on the wireless charging receiver according to the Q-value.

[0065] In the embodiments of the present disclosure, the detection module calculates the Q-value parameter by detecting the oscillation attenuation of the resonant capacitor voltage of the transmitter resonant cavity and sends the Q-value parameter to the control module.

[0066] In the embodiments of the present disclosure, the control module calculates the Q-value according to the Q-value parameter and determines whether there is a wireless charging receiver according to the magnitude of the quality factor Q-value and sends a wake-up signal to the power supply circuit 101.

[0067] In the embodiments of the present disclosure, the detection module is responsible for detecting the resonant circuit and obtaining information related to the Q value, while the control module decides whether to wake up the power supply circuit to enter the power transmission state according to the Q value. Through such a detection and control process, lower detection power consumption at the receiving end and higher system efficiency can be achieved, improving the performance and user experience of the wireless charging system.

[0068] Among them, Figure 10 is a schematic diagram of the structure of a drive circuit in a wireless charging circuit shown according to an exemplary embodiment. As Figure 10 shown, the drive circuit 104 includes a drive controller, a switch control circuit, and a first bias power supply.

[0069] Among them, the switch control circuit includes a first transistor, a second transistor, a third transistor, and a fourth transistor.

[0070] Among them, the input end of the first transistor and the input end of the third transistor are connected to the first bias power supply; the control ends of the first transistor, the second transistor, the third transistor, and the fourth transistor are connected to the drive controller; the output end of the first transistor is connected to the input end of the second transistor, and the output end of the third transistor is connected to the input end of the fourth transistor; the output ends of the second transistor and the fourth transistor are grounded.

[0071] In the embodiments of the present disclosure, the first bias power supply is used to charge the resonant circuit 105.

[0072] In the embodiments of the present disclosure, the drive controller is used to drive the switch control circuit to conduct every set time. And send a charging signal to the resonant circuit 105 to charge the resonant circuit and generate LC resonance.

[0073] Among them, the switch control circuit may include a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor connected to both ends of the resonant circuit. Among them, in the embodiments of the present disclosure, N-channel MOS (metal-oxide semiconductor, MOS) is used for illustration, and the type and model of the transistor are not limited.

[0074] The drive control circuit controls the on and off of the switching tubes Q1 to Q4 through the switch control circuit to charge the resonant capacitor Cp and generate LC resonance. For example, the detection module initiates a detection every 500 ms, the switch control circuit turns on the Q2 tube, and at the same time enables a bias power supply to charge the resonant capacitor Cp of the transmitter resonator. When the voltage of Cp reaches 2.5V, the charging circuit is turned off, and the Q4 tube is turned on after 2 ms to generate LC resonance.

[0075] In one embodiment, the control module is connected to the power supply circuit 101 and the detection module. The Q value is calculated based on the Q value parameters, and the Q value parameters include the time width of the pulse signal T_measure generated according to the resonant point voltage and the resonant frequency. If at least one of the Q value, the time width, and the resonant frequency is greater than a set threshold, it is determined that there is a wireless charging receiver end, and a wake-up signal is sent to the LDO in the power supply circuit 101.

[0076] The control module calculates the Q value according to the Q value parameters sent by the detection module. If at least one of the Q value, the pulse time width, and the resonant frequency is greater than a set threshold, a wake-up signal is generated to wake up the LDO, thereby waking up the power supply circuit 101 to enter the power transmission state.

[0077] To achieve a more accurate determination, it can also be compared with the Q value and Q value parameters in the initial state. If at least one of the changes in the quality factor Q, the pulse time width, and the resonant frequency compared with the initial state is greater than a set threshold, a wake-up signal is generated to wake up the LDO, thereby waking up the power supply circuit 101 to enter the power transmission state.

[0078] For example, if the change in the Q value exceeds a preset value, or the change in the length of ΔT exceeds a preset value, or the change in the frequency exceeds a preset value, the Q value control circuit will generate a wake-up signal to wake up the LDO, and the power supply circuit 101 enters the normal working mode.

[0079] Among them, Figure 11 is a schematic diagram of the structure of the resonant circuit in a wireless charging circuit shown according to an exemplary embodiment. As Figure 11 shown, the resonant circuit 105 includes a capacitor and an inductor.

[0080] Among them, one end of the capacitor is connected to the drive circuit, and the other end is connected to the inductor and the wake-up detection circuit.

[0081] Among them, the inductor is connected to the drive circuit.

[0082] In the implementation of the present disclosure, the resonant circuit can be located at the wireless charging transmitter end.

[0083] Furthermore, in combination with the wake-up detection circuit and the drive control circuit, one end of the capacitor is connected to the output end of the third transistor or the input end of the fourth transistor; the other end of the capacitor is connected to the inductor and the detection module; the inductor is connected to the output end of the first transistor or the input end of the second transistor.

[0084] In the embodiment of the present disclosure, it can be understood that the capacitor and the inductor in the resonant circuit are connected in series.

[0085] Among them, the resonant circuit may include an inductor Lp and a resonant capacitor Cp. The phase midpoint of the resonant circuit is connected to the detection circuit and is used to output the resonant point voltage VATNK to the detection circuit.

[0086] In the resonant circuit of the wireless charging circuit in the embodiments of the present disclosure, the inductor and the capacitor are key components for forming a resonant oscillation. The resonant circuit is one of the core parts for realizing efficient wireless energy transmission.

[0087] Among them, the inductor is usually composed of a coil and stores energy by generating a magnetic field on the wire. In the resonant circuit at the transmitting end, the inductor is usually referred to as a resonant coil or a transmitting coil. The main function of the resonant coil is to convert the DC power supply voltage at the transmitting end into an alternating current. When a DC power supply is applied to the resonant coil, it can generate a changing magnetic field, causing a resonant current to flow in the coil.

[0088] The capacitor is usually an element composed of two electrodes separated by a dielectric between two conductors. In the resonant circuit at the transmitting end, the capacitor is usually referred to as a resonant capacitor. The main function of the resonant capacitor is to jointly form a resonant circuit with the resonant coil. When current flows in the resonant coil, the resonant capacitor stores electrical energy. Then, the electrical energy of the resonant capacitor and the magnetic field of the resonant coil are repeatedly converted with each other to form a resonant oscillation.

[0089] In the embodiments of the present disclosure, the resonant point voltage VTANK usually refers to the midpoint voltage in the resonant circuit. When the resonant circuit is in a resonance state, at the resonant frequency, the energy between the inductor Lp and the capacitor Cp exchanges back and forth, forming a resonant oscillation. In this state, the voltage of the resonant circuit will have a phase change, and near the resonant frequency, the voltage presents a maximum value.

[0090] The resonant point voltage is an important indicator for energy transmission and exchange in the resonant circuit. Detecting the change of the resonant point voltage can provide information related to the characteristics of the resonant circuit, and thus be used to determine the presence of the receiving end.

[0091] In the embodiments of the present disclosure, the detection module is connected to the midpoint of the capacitor and the inductor in the resonant circuit, so as to be able to acquire the resonant point voltage signal of the resonant circuit, determine the Q-value parameter based on the oscillation attenuation amplitude and frequency of the resonant point voltage, and transmit the Q-value parameter to the control module.

[0092] In the embodiments of the present disclosure, the detection module is connected to the midpoint of the capacitor and the inductor in the resonant circuit. It can be understood that the detection module is connected to the phase midpoint of the resonant circuit and is used to detect the oscillation attenuation amplitude and frequency of the resonant point voltage VTANK, and transmit the Q-value parameter to the control module.

[0093] For example, the oscillation attenuation amplitude of the resonant point voltage VTANK is detected by the detection module. If the voltage is less than VHIGH within a single period according to the comparison with two set voltage thresholds, a rising edge of T_measure is generated. If the voltage is less than VLOW within a single period, a falling edge of T_measure is generated. At the same time, the quality factor Q value detection circuit generates a square wave signal of the same frequency based on the zero crossing point of the resonant waveform and sends it to the Q value control circuit.

[0094] In an embodiment of the present disclosure, the wireless charging circuit further includes a second bias power supply.

[0095] Wherein, the second bias power supply is connected to the voltage regulator and the first pin, and can be used to supply power to the wake-up circuit when the power supply circuit is awakened.

[0096] Figure 12 It is a schematic diagram of the structure of a power supply circuit in a wireless charging circuit shown according to an exemplary embodiment. As Figure 12 shown, the power supply circuit 101 includes a power input terminal and a voltage regulator.

[0097] In an embodiment of the present disclosure, the power supply circuit 101 may include a power input terminal and a low dropout regulator (LDO).

[0098] Wherein, the low dropout regulator is connected to the power input terminal, and can adjust the signal input to the power input terminal based on the low dropout regulator to obtain a stable signal.

[0099] In an embodiment of the present disclosure, the signal passing through the low dropout regulator is used as the control signal for the microcontroller unit (MCU) and the power stage module, so as to be able to control power transmission and manage the system state.

[0100] In an embodiment of the present disclosure, the wireless charging circuit further includes a second bias power supply. Wherein, the second bias power supply is connected to the voltage regulator and the first pin, and is used to supply power to the voltage regulator and the first pin.

[0101] In the embodiments of the present disclosure, the above-mentioned wireless charging circuit will be described below in conjunction with examples.

[0102] Figure 13 It is a schematic diagram of the structure of a wireless charging circuit shown according to an exemplary embodiment.

[0103] Among them, the power supply circuit provides power supply for the entire wireless charging circuit to ensure that each component operates under normal working voltage. The wake-up circuit is used to power the wake-up power supply circuit, make the power supply circuit work properly, and separate from the power supply circuit. Thus, the wake-up circuit can perform the detection of the receiving end independently without starting the entire wireless charging circuit. In this way, when the wireless charging circuit detects the receiving end, the power supply circuit can maintain a powered-off state, avoiding unnecessary power consumption, and thus significantly reducing the standby power consumption of the system.

[0104] Among them, the wireless charging circuit further includes an MCU microcontroller unit for controlling and managing each function of the wireless charging circuit. The power stage is the part responsible for actual energy transfer and can be used to adjust the transfer power.

[0105] In the embodiment of the present disclosure, the power supply unit includes a power input terminal VDD and an LDO.

[0106] In the embodiment of the present disclosure, the first pin in the wake-up detection circuit can be Raw5, the first sub-circuit can be BG, the detection module can be the Q_DET module, and the control module can be the Q_CTRL module.

[0107] In the embodiment of the present disclosure, after the wireless charging transmitter is connected to the power supply VIN, a regulated voltage Valways can be generated through the Raw5 pin and supply power to BG (bandgap) at the same time.

[0108] In wireless charging, BG is a circuit used to generate a stable reference voltage. Its function is to provide a constant voltage to the transmitter system of wireless charging to ensure the normal operation of wireless charging. BG can use two resistors with different temperature coefficients to offset the influence of temperature on the voltage, thereby generating a constant voltage independent of temperature.

[0109] In the embodiment of the present disclosure, Valways provides an input voltage for the Q_DET module and the Q_CTRL module, thereby performing Q-value detection and related control, and then detecting the wireless charging receiving end. At this time, the power supply circuit does not work, and the microcontroller unit and the power stage are both in a non-operating state with extremely low power consumption.

[0110] In the embodiment of the present disclosure, the wake-up detection circuit controls the on and off of the switching transistors Q1 to Q4 through a drive controller to charge the resonant capacitor Cp and generate LC resonance. For example, the Q_DET module initiates a detection every 500 ms. The switch control circuit turns on Q2 and Q3, and at the same time enables a bias power supply to charge the resonant capacitor Cp of the transmitter resonator cavity. When the voltage of Cp reaches 2.5V, the charging circuit is turned off, Q3 is turned off, and Q4 is turned on after 2 ms to generate LC resonance.

[0111] The Q_DET module detects the oscillation attenuation amplitude of the resonant point VTANK voltage and sends the relevant detection parameters to the Q_CTRL module. For example, by comparing with two set voltage thresholds, if the voltage is less than VHIGH within a single period, a rising edge of T_measure is generated; if the voltage is less than VLOW within a single period, a falling edge of T_measure is generated. At the same time, the Q_DET module generates a square wave signal with the same frequency according to the zero-crossing point of the resonant waveform and sends it to the Q_CTRL module.

[0112] The control module calculates the Q value according to the detection parameters sent by the detection module. If at least one of the Q value, pulse width, and resonant frequency is greater than the set threshold, a wake-up signal is generated to wake up the LDO, thereby waking up the main power supply circuit to enter the power transmission state.

[0113] To achieve more accurate determination, it is also possible to compare with the Q value and Q value parameters in the initial state. If at least one of the changes in the quality factor Q, pulse width, and resonant frequency compared with the initial state is greater than the set threshold, a wake-up signal is generated to wake up the LDO, thereby waking up the power supply circuit to enter the power transmission state.

[0114] For example, the Q_CTRL module calculates the magnitude of the Q value through the pulse width generated by T_measure and the frequency of the fr square wave signal. If the change in the Q value exceeds the preset value or the change in the length of ΔT exceeds the preset value or the change in the resonant frequency exceeds the preset value, the Q_CTRL will generate a wake-up signal to wake up the LDO, and the chip enters the working mode.

[0115] Among them, the Q value can be calculated by the following formula:

[0116]

[0117] Based on the same concept, the embodiments of the present disclosure also provide a wireless charging chip and a wireless charging device.

[0118] It can be understood that, in order to implement the above functions, a wireless charging chip and a wireless charging device provided by the embodiments of the present disclosure include the corresponding hardware structures and / or software modules for executing each function. Combining the units and algorithm steps of the examples disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described function, but such implementation should not be considered to exceed the scope of the technical solution of the embodiments of the present disclosure.

[0119] Figure 14It is a schematic diagram of an electronic device shown according to an exemplary embodiment. Referring to Figure 14 , the electronic device 200 includes a wireless charging chip 201.

[0120] The wireless charging chip 201 includes the above-mentioned wireless charging circuit;

[0121] The specific manner of the above wireless charging circuit has been described in detail in the embodiments related to the circuit, and will not be elaborated here.

[0122] Figure 15 It is a block diagram of a device 300 for wireless charging shown according to an exemplary embodiment. For example, the device 300 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0123] Referring to Figure 15 , the device 300 may include one or more of the following components: a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 312, a sensor component 314, and a communication component 316.

[0124] The processing component 302 generally controls the overall operation of the device 300, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to complete all or part of the steps of the above-mentioned receiver detection. In addition, the processing component 302 may include one or more modules to facilitate the interaction between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0125] The memory 304 is configured to store various types of data to support the operation of the device 300. Examples of these data include any application programs or instructions for receiver detection to operate on the device 300, contact data, phone book data, messages, pictures, videos, etc. The memory 304 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0126] The power component 306 provides power for various components of the device 300. The power component 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 300.

[0127] The multimedia component 308 includes a screen that provides an output interface between the device 300 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can not only sense the boundaries of the touch or swipe actions, but also detect the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 308 includes a front camera and / or a rear camera. When the device 300 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0128] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes a microphone (MIC) that is configured to receive external audio signals when the device 300 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 further includes a speaker for outputting audio signals.

[0129] The I / O interface 312 provides an interface between the processing component 302 and a peripheral interface module, which can be a keyboard, a click wheel, buttons, etc. These buttons can include, but are not limited to: a home button, a volume button, a power button, and a lock button.

[0130] The sensor assembly 314 includes one or more sensors for providing a status assessment of various aspects of the device 300. For example, the sensor assembly 314 can detect the on / off state of the device 300, the relative positioning of components, such as the display and keypad of the device 300. The sensor assembly 314 can also detect a change in the position of the device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration / deceleration of the device 300, and the temperature change of the device 300. The sensor assembly 314 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 314 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0131] The communication component 316 is configured to facilitate communication between the device 300 and other devices in a wired or wireless manner. The device 300 can access a wireless network based on communication standards, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 316 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0132] In an exemplary embodiment, the device 300 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-mentioned receiver detection.

[0133] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions, such as the memory 304 including instructions, is also provided. The above instructions can be executed by the processor 320 of the device 300 to complete the above-mentioned receiver detection. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0134] It can be understood that in this disclosure, "a plurality of" means two or more, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The singular forms of "a", "the", and "said" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0135] It can be further understood that the terms "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or degree of importance. In fact, the expressions such as "first" and "second" can be used interchangeably completely. For example, without departing from the scope of this disclosure, the first information can also be called the second information, and similarly, the second information can also be called the first information.

[0136] It can be further understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0137] It can be further understood that unless otherwise specified, "connection" includes direct connection without other components between the two, and also includes indirect connection with other elements between the two.

[0138] It can be further understood that although the operations are described in a specific order in the drawings in the embodiments of this disclosure, it should not be understood as requiring these operations to be performed in the specific order shown or in a serial order, or requiring all the operations shown to obtain the desired result. In a specific environment, multitasking and parallel processing may be beneficial.

[0139] Those skilled in the art will readily think of other embodiments of this disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure, which follow the general principles of this disclosure and include the common general knowledge or conventional technical means in this technical field not disclosed in this disclosure.

[0140] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A wireless charging circuit, characterized in that: include: Power supply circuit; The wake-up circuit is connected to the power supply circuit and sends a wake-up signal to the power supply circuit when a wake-up condition is met.

2. The wireless charging circuit according to claim 1, characterized in that: The wake-up circuit includes a wake-up detection circuit, a driving circuit and a resonant circuit; Wherein, the wake-up detection circuit is connected to the power supply circuit, the drive circuit and the resonant circuit; and the drive circuit is connected to the resonant circuit.

3. The wireless charging circuit according to claim 2, characterized in that: The wake-up detection circuit comprises: A first pin, a first subcircuit, a detection module and a control module; the first pin is connected to the power supply circuit, and the first pin is respectively connected to the first subcircuit, the detection module and the control module; wherein the first subcircuit includes a bandgap reference BG.

4. The wireless charging circuit according to claim 2, characterized in that: The driving circuit includes: a driving controller, a switch control circuit and a first bias power supply; Wherein, the switch control circuit includes a first transistor, a second transistor, a third transistor and a fourth transistor; The input end of the first transistor and the input end of the third transistor are connected to the first bias power supply; the control end of the first transistor, the control end of the second transistor, the control end of the third transistor and the control end of the fourth transistor are connected to the driving controller; the output end of the first transistor is connected to the input end of the second transistor, and the output end of the third transistor is connected to the input end of the fourth transistor; the output end of the second transistor and the output end of the fourth transistor are grounded.

5. The wireless charging circuit according to claim 2, characterized in that: The resonant circuit includes a capacitor and an inductor, wherein one end of the capacitor is connected to the driving circuit, and the other end is connected to the inductor and the wake-up detection circuit; the inductor is connected to the driving circuit.

6. The wireless charging circuit according to claim 5, characterized in that: The wireless charging circuit includes a driving circuit, the driving circuit includes a switch control circuit, the switch control circuit includes a first transistor, a second transistor, a third transistor and a fourth transistor, and the wake-up detection circuit includes a detection module; One end of the capacitor is connected to the output end of the third transistor, or the input end of the fourth transistor; the other end of the capacitor is connected to the inductor and the detection module; the inductor is connected to the output end of the first transistor, or the input end of the second transistor.

7. The wireless charging circuit according to claim 1, characterized in that: The power supply circuit includes a power input terminal and a voltage stabilizer connected to the power input terminal.

8. The wireless charging circuit according to any one of claims 1 to 7, characterized in that: The power supply circuit includes a voltage stabilizer, the wake-up circuit includes a wake-up detection circuit, and the wake-up detection circuit includes a first pin; The wireless charging circuit further includes a second bias power supply, and the second bias power supply is connected to the regulator and the first pin.

9. A wireless charging chip, characterized in that: The wireless charging circuit comprises the wireless charging circuit as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: include: A wireless charging chip, comprising the wireless charging circuit according to any one of claims 1 to 8.

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