Rectification and boosting circuit, wireless charging receiving module, chip and electronic equipment

Abstract

The present application discloses a rectifier boost circuit, a wireless charging receiving module, a chip and an electronic device, and relates to the field of wireless charging technology. The rectifier boost circuit includes a rectifier bridge module and a boost module; the rectifier bridge module is used to convert the external AC voltage into a DC voltage and obtain an output voltage, and start the control chip when the output voltage is greater than or equal to a preset value; the boost module is used to conduct when the output voltage is less than a preset value, and the rectifier bridge module works in a half-bridge mode to allow the resonance module to store energy, so as to increase the output voltage of the rectifier bridge module to facilitate the start of the control chip. Based on the solution of the present application, when the placement position of the device to be charged in the wireless charger is not standardized, the input voltage of the rectifier bridge module can be increased by the boost module, thereby enhancing the rectifier output voltage, so that the device to be charged that is not placed in a standardized manner can also be wirelessly charged, effectively improving the user's freedom of wireless charging and improving the user's wireless charging experience.

Description

Technical Field

[0001] The present application relates to the field of wireless charging technology, and in particular to a rectifier and boost circuit, a wireless charging receiving module, a chip and an electronic device. Background Art

[0002] Wireless charging technology is a technology that can realize the charging process between the power supply end and the charging end without connecting wires. With the advancement of science and technology, wireless charging technology has become more and more mature and widely used in a variety of smart terminal products, such as mobile phones, computers and electric vehicles.

[0003] When wireless charging technology is applied to mobile phones, wireless charging is generally performed by electromagnetically coupling the transmitting coil in the wireless charger with the receiving coil in the mobile phone. However, when the user places the mobile phone in an irregular position on the wireless charger, that is, when the center of the receiving coil in the mobile phone is far away from the center of the transmitting coil in the wireless charger, the coupling voltage is small and wireless charging is often not possible, which causes the user to adjust the position of the mobile phone on the wireless charger multiple times, and the user's freedom of wireless charging is low, affecting the user's charging experience.

[0004] Therefore, a new solution is urgently needed to solve the above problems. Summary of the invention

[0005] The present application provides a rectifier boost circuit, a wireless charging receiving module, a chip and an electronic device. The boost module increases the input voltage of the rectifier bridge module, thereby enhancing the rectifier output voltage, so that wireless charging can be achieved even for devices to be charged that are not placed in a standardized manner, effectively improving the user's freedom of wireless charging and enhancing the user's wireless charging experience.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, a rectifier boost circuit is provided, which is applied to a resonance module and a control chip without a fixed power supply, and the rectifier boost circuit includes a rectifier bridge module and a boost module; the rectifier bridge module is electrically connected to the resonance module and the control chip, respectively, and is configured to convert an external AC voltage into a DC voltage and obtain an output voltage, and start the control chip when the output voltage is greater than or equal to a preset value; the boost module is electrically connected to the rectifier bridge module and the control chip, respectively, and is configured to be turned on when the output voltage is less than the preset value, and the rectifier bridge module operates in a half-bridge mode to store energy in the resonance module, so as to increase the output voltage of the rectifier bridge module to facilitate starting the control chip.

[0008] In the embodiment of the present application, when the device to be charged attempts to perform wireless charging with the wireless charger, when the output voltage of the rectifier bridge module in the device to be charged is greater than or equal to the preset value, it indicates that the device to be charged is in the chargeable range of the wireless charger, and the device to be charged starts the control chip to establish a wireless charging connection with the wireless charger. When the output voltage of the rectifier bridge module in the device to be charged is less than the preset value, it indicates that the device to be charged is not in the chargeable range of the wireless charger, the boost module is turned on, the rectifier bridge module works in half-bridge mode, and the resonance module stores energy, thereby increasing the input voltage and output voltage of the rectifier module, which is more conducive to the device to be charged starting the control chip and establishing a wireless charging connection with the wireless charger, so that the device to be charged that is not placed in a standardized manner can also be wirelessly charged, effectively improving the user's freedom of wireless charging and improving the user's wireless charging experience.

[0009] It should be noted that in order to ensure the low power consumption performance of the control chip in the device to be charged in the standby state, the control chip generally adopts a control chip without a fixed power supply.

[0010] It should be noted that the first inductor is generally a receiving charging coil in the device to be charged.

[0011] It should be noted that the rectifier bridge module generally uses a rectifier bridge composed of four MOS tubes.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the boost module is further configured to be disconnected when the output voltage is greater than or equal to the preset value, so that the rectifier bridge module operates in a full-bridge mode to restore rectification efficiency.

[0013] In this implementation, after the device to be charged has established a wireless charging connection with the wireless charger, the boost module is disconnected, allowing the rectifier bridge module to operate in full-bridge mode, thereby restoring the full-bridge rectification efficiency of the rectifier bridge module to increase the wireless charging power.

[0014] In combination with the first aspect, in some implementations of the first aspect, the rectifier bridge module includes a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube; the source of the first MOS tube and the drain of the fourth MOS tube are both electrically connected to one end of the resonance module, the drain of the first MOS tube and the drain of the second MOS tube are both electrically connected to one end of the boost module, the source of the second MOS tube and the drain of the third MOS tube are both electrically connected to the other end of the boost module, and the source of the third MOS tube is electrically connected to the source of the fourth MOS tube.

[0015] In this implementation, a rectifier bridge module is formed by the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube, which is used to rectify the external input AC voltage, thereby converting the AC voltage into a DC voltage to facilitate charging the charging device.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the boost module includes a fifth MOS tube and a buck device; the source of the fifth MOS tube is electrically connected to the drain of the second MOS tube through the buck device, and the drain of the fifth MOS tube is electrically connected to the source of the second MOS tube.

[0017] In this implementation, when the output voltage of the rectifier module is less than a preset value, the fifth MOS tube is turned on, so that the rectifier module works in half-bridge mode, so that the resonant module stores energy according to the AC voltage, and the output voltage of the rectifier module continues to increase. When the output voltage of the rectifier module is greater than or equal to the preset value, the control chip is started. The buck device is used for voltage division, and when the gate-source voltage of the fifth MOS tube is greater than the gate-source disconnection voltage, the fifth MOS tube is disconnected, so that the rectifier bridge module works in full-bridge mode to restore the rectification efficiency.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the voltage-reducing device includes a first resistor; the first resistor is connected between the source of the fifth MOS tube and the drain of the second MOS tube, and the gate of the fifth MOS tube is electrically connected to the drain of the second MOS tube.

[0019] In this implementation, the voltage-reducing device may select the first resistor, and the first resistor plays a voltage-dividing role to assist in increasing the gate-source voltage of the fifth MOS tube.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the step-down device includes a first diode; an anode of the first diode is electrically connected to a drain of the second MOS tube, and a cathode of the first diode is electrically connected to a source of the fifth MOS tube.

[0021] In this implementation, the voltage-reducing device may select the first diode, and the first diode plays a voltage-dividing role to assist in increasing the gate-source voltage of the fifth MOS tube.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the boost module includes a fifth MOS tube and a voltage measurement and control chip; the source of the fifth MOS tube is electrically connected to the drain of the second MOS tube, the drain of the fifth MOS tube is electrically connected to the source of the second MOS tube, and the voltage measurement and control chip is electrically connected to the gate of the fifth MOS tube and the source of the fifth MOS tube, respectively.

[0023] In this implementation, when the output voltage of the rectifier module is less than a preset value, the fifth MOS tube is turned on, so that the rectifier module works in half-bridge mode, so that the resonance module stores energy according to the AC voltage, and the output voltage of the rectifier module continues to increase. When the output voltage of the rectifier module is greater than or equal to the preset value, the control chip is started. The control chip controls the output voltage of the rectifier module through the voltage measurement and control chip. When the output voltage of the rectifier module is greater than the preset value, the fifth MOS tube is disconnected, so that the rectifier bridge module works in full-bridge mode to restore the rectification efficiency.

[0024] In combination with the first aspect, in some implementations of the first aspect, the fifth MOS transistor includes a P-channel depletion-type MOS transistor.

[0025] In this implementation, the fifth MOS tube can be a P-channel depletion-type MOS tube, and since the P-channel depletion-type MOS tube is turned on when the gate-source voltage is 0 or negative, the fifth MOS tube is turned on when it is not powered on, and is disconnected when the gate-source voltage is greater than the gate-source disconnection voltage, so that the fifth MOS tube is disconnected when the output voltage of the rectifier module is greater than a preset value, thereby restoring the full-bridge rectification efficiency of the rectifier module.

[0026] In combination with the first aspect, in some implementations of the first aspect, the resonance module includes a first inductor and a first capacitor; one end of the first inductor is electrically connected to one end of the first capacitor, and the other end of the first inductor and the other end of the first capacitor are respectively electrically connected to the rectifier bridge module.

[0027] In this implementation, the first inductor is used as a receiving coil to sense electromagnetic energy in space. The first inductor and the first capacitor cooperate to form a resonant circuit to convert the electromagnetic energy into an AC voltage for use in a subsequent rectification and boosting circuit.

[0028] In the second aspect, a wireless charging receiving module is provided, comprising a resonance module, a control chip without a fixed power supply, and the rectification and boosting circuit; the rectification and boosting circuit is electrically connected to the resonance module and the control chip, respectively; the resonance module is configured to convert electromagnetic energy in space into AC voltage; the control chip is configured to control the wireless charging process of the wireless charging receiving end.

[0029] In an embodiment of the present application, when the device to be charged attempts to perform wireless charging with the wireless charger, the resonance module is used to convert the electromagnetic energy in the space into an AC voltage, the rectification and boost circuit is used to rectify the AC voltage into a DC voltage, and the control chip is used to start according to the DC voltage, thereby enabling wireless charging between the device to be charged and the wireless charger.

[0030] In a third aspect, a wireless charging receiving chip is provided, comprising the wireless charging receiving module.

[0031] In the embodiment of the present application, the wireless charging receiving chip is used to attempt to start the wireless charging process when the device to be charged is close to the wireless charger, so that the wireless charger can wirelessly charge the device to be charged.

[0032] In a fourth aspect, an electronic device is provided, comprising the wireless charging receiving chip.

[0033] In the embodiment of the present application, the electronic device may be a device to be charged, for example. The wireless charging receiving chip is used to attempt to start a wireless charging process when the device to be charged is close to the wireless charger, so that the wireless charger can wirelessly charge the device to be charged. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a wireless charging scenario applicable to an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0036] Figure 3 This is a schematic diagram of the structure of a wireless charging receiving module provided in an embodiment of the present application;

[0037] Figure 4 This is a schematic diagram of a structure in which a wireless charging receiving module provided in an embodiment of the present application is not placed in a standard manner;

[0038] Figure 5 A schematic diagram of the structure of a rectifier and boost circuit provided in an embodiment of the present application;

[0039] Figure 6 A circuit diagram of a rectifier and boost circuit provided in an embodiment of the present application;

[0040] Figure 7 A circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application;

[0041] Figure 8 A circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application;

[0042] Fig. 9 A circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application;

[0043] Fig.10 A circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application;

[0044] Fig.11 A circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application;

[0045] Fig.12A waveform diagram of a rectifier and boost circuit provided in an embodiment of the present application;

[0046] Fig.13 A circuit diagram of a wireless charging receiving module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0048] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0049] In order to facilitate the understanding of the embodiments of the present application, the relevant concepts involved in the embodiments of the present application are first briefly described.

[0050] 1. Wireless charging technology (IC). In the field of electronic technology, wireless charging technology originates from wireless power transmission technology and can be divided into two types: low-power wireless charging and high-power wireless charging. Among them, low-power wireless charging generally adopts electromagnetic induction, for example, the Qi method for charging mobile phones. High-power wireless charging generally adopts resonance, that is, the power supply equipment (such as the charger) transmits energy to the power-consuming device, and the power-consuming device uses the received energy to charge the battery and for its own operation. Since the charger and the power-consuming device transmit energy through the magnetic field, there is no need for wires to connect the two, so the charger and the power-consuming device can be made without exposed conductive contacts. For example, most electric vehicles are generally charged in this way. However, a small number of electric vehicles are charged by electromagnetic induction.

[0051] 2. Electromagnetic coupling. In the field of electronic technology, electromagnetic coupling is also called mutual inductance coupling. It is a phenomenon that the current change of one circuit affects the other circuit due to the mutual inductance between two circuits. Specifically, there is a close coordination and mutual influence between the input and output of two or more circuit elements or electrical networks, and energy is transmitted from one side to the other through interaction. In general, coupling refers to a measure of mutual dependence of two entities on each other.

[0052] 3. Wireless charging transmitter (TX). In the field of electronic technology, the wireless charging transmitter can be a wireless charging transmitter, including an MCU, a power full bridge, and an LC resonant circuit composed of an inductor and a capacitor, where the inductor is the transmitter coil. The input end of the wireless charging transmitter is a DC voltage, which generates an AC voltage (AC Voltage) through the power full bridge, i.e. a square wave. The square wave is loaded at both ends of the LC resonant circuit to generate an AC current (AC Current), which generates a magnetic field through the coil, thereby radiating magnetic field energy into space.

[0053] 4. Wireless charging receiver (RX). In the field of electronic technology, the wireless charging receiver can be a mobile phone with wireless charging function, etc., including MCU, rectifier bridge, low dropout regulator (LDO), charger chip, battery, and LC resonant circuit, where the inductor is the receiving coil. The wireless charging receiving coil senses the energy of the spatial magnetic field and generates AC current in the receiving LC resonant circuit. The AC current is converted into DC voltage through the rectifier bridge, and the DC voltage is then charged to the battery through the low dropout regulator and the electrical chip.

[0054] 5. Voltage doubler rectifier circuit. In the field of electronic technology, voltage doubler rectifier circuit refers to a circuit that can use a rectifier diode and capacitor with a higher withstand voltage to rectify a lower AC voltage into a higher DC voltage. For example, in some places where high voltage and low current are required, voltage doubler rectifier circuits are often used. Voltage doubler rectifier circuits are generally divided into double voltage, triple voltage and multiple voltage rectifier circuits according to how many times the output voltage is the input voltage.

[0055] 6. Packet Internet Groper (ping). In the field of electronic technology, the Internet packet groper is a program that tests the network connection. It often uses the "ping" command to check whether the network is smooth or the network connection speed, which can facilitate the analysis and determination of network failures. The specific working principle is: using the uniqueness of the machine IP address on the network, send a data packet to the target IP address, and then ask the other party to return a data packet of the same size to determine whether the two network machines are connected and what the delay is. For example, during the wireless charging process, when the wireless charging transmitter (TX) detects the wireless charging receiver (RX), the wireless charging transmitter (TX) will send a signal with enough energy (Digital Ping) to start the communication function of the wireless charging receiver (RX). The wireless charging receiver (RX) responds to the signal strength indication packet. After receiving the signal strength packet, the wireless charging transmitter (TX) will maintain the power signal and allow the system to enter the next stage.

[0056] The above is a brief introduction to the nouns involved in the embodiments of the present application, which will not be repeated below.

[0057] Figure 1 A schematic diagram of a wireless charging scenario applicable to an embodiment of the present application.

[0058] like Figure 1 As shown, the user can use the wireless charging device 200 to wirelessly charge the electronic device 100. The embodiment of the present application does not specifically limit the type of the electronic device 100. In some embodiments, the electronic device 100 can be a mobile phone, a wearable device (such as a smart bracelet, a smart watch, a headset, etc.), a tablet computer, a laptop computer, a handheld computer, a notebook computer, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a cellular phone, a personal digital assistant (personal digital assistant, PDA), augmented reality (augmented reality, AR) \ virtual reality (virtual reality, VR) devices and other IOT (internet of things, Internet of Things) devices, and can also be a television, a large screen, a printer, a projector and other devices. In some embodiments, the wireless charging device 200 can be a mobile phone wireless charger, an electric car charging pile, etc.

[0059] For ease of understanding, the following embodiments are described illustratively by taking the electronic device 100 as a mobile phone as an example.

[0060] Figure 2 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0061] like Figure 2 As shown, the electronic device 100 may include a central processing unit (CPU) 10, a wireless charging receiving module 20, and a battery 30, etc. These devices may be coupled via various interconnection buses or other electrical connection methods. Exemplarily, the wireless charging receiving module 20 is electrically connected to the central processing module 10 and the battery 30, respectively.

[0062] It should be noted that a wireless charging transmitting module may be provided in the wireless charging device 200 to transmit magnetic field energy to the wireless charging receiving module 20 .

[0063] The central processing module 10 is one of the main devices of a personal computer and is a core component in a personal computer. Its main function is to interpret computer instructions and process data in computer software. The CPU is responsible for reading instructions for all operations in a personal computer and is the core component that decodes and executes instructions. A program is a sequence of instructions, and executing a program is to execute instructions one by one according to the instruction sequence. Once the program is loaded into the main memory, the CPU can automatically complete the task of reading instructions from the main memory and executing instructions. At the same time, the function of an instruction is often realized by a series of operations performed by components in a personal computer. The CPU will generate corresponding operation control signals according to the function of the instruction and send them to the corresponding components, thereby controlling these components to act according to the requirements of the instruction.

[0064] Exemplarily, the central processing module 10 may include an arithmetic logic unit, a register unit, an operator, and a control unit. The arithmetic logic unit may perform fixed-point or floating-point arithmetic operations, shift operations, and logic operations, and may also perform address operations and conversions. The register unit includes a general register, a special register, and a control register. The control unit is mainly responsible for decoding instructions and issuing control signals for each operation to be performed to complete each instruction.

[0065] The wireless charging receiving module 20 is a charging module set inside the electronic device 100. The wireless charging receiving module 20 is generally used in conjunction with the wireless charging transmitting module in the wireless charging device. The wireless charging device is generally continuously connected to an external power source, and as a wireless charging device, it provides an energy source for wireless charging for the electronic device 100. In order to reduce power consumption, the wireless charging receiving module 20 generally does not have a permanent power supply inside, and the wireless charging process cannot be actively started. The wireless charging transmitting module is generally connected to an external power supply, converts the external DC power supply into AC voltage, and converts the AC voltage into magnetic field energy, which is continuously radiated to the external space. When the wireless charging receiving module 20 is close to a certain range of the wireless charging transmitting module, the wireless charging receiving module 20 couples to a certain magnetic field energy from space and converts it into AC voltage and DC voltage in turn. When the DC voltage is greater than the preset value, the control chip in the wireless charging receiving module 20 starts, establishes a wireless connection with the wireless charging transmitting module, and wirelessly charges the wireless charging receiving module 20 through the wireless charging transmitting module.

[0066] Exemplarily, the wireless charging receiving module 20 may be a wireless charging receiving chip in a mobile phone with a wireless charging function, or a wireless charging receiving chip in an electric car with a wireless charging function.

[0067] The battery 30 is mainly used to store electric energy and provide electric energy for the operation of the electronic device 100. For example, the battery in a personal mobile phone can be used to store the electric energy obtained by the wireless charging receiving module 20 and can also be used to provide electric energy during the use of the personal mobile phone.

[0068] It should be understood that the above is only an example of the structure of the electronic device 100, and the electronic device 100 may also include other subsystems or devices, which can be configured and modified as needed, and the embodiments of the present application do not impose any limitations on this.

[0069] Figure 3 The present invention is a schematic diagram of the structure of a wireless charging receiving module provided in an embodiment of the present application.

[0070] like Figure 3 As shown, the wireless charging receiving module 20 may include a receiving resonant circuit 201, a rectifier bridge 202 and a controller 203. The rectifier bridge 202 is electrically connected to the receiving resonant circuit 201 and the controller 203 respectively. The receiving resonant circuit 201 is used to convert the magnetic field energy in the space into an AC voltage. The rectifier bridge 202 is used to convert the AC voltage into a DC voltage for use by the electronic device 100 and storage in the battery 30. The controller 203 is used to control the operation of the rectifier bridge 202.

[0071] During the wireless charging process, the wireless charging receiving module 20 cooperates with the wireless charging transmitting module to perform wireless charging operations, and within a certain range, the wireless charging receiving module 20 receives the magnetic field energy radiated by the wireless charging transmitting module. Exemplarily, the wireless charging transmitting module may generally include a power full bridge and a transmitting resonant circuit, the power full bridge is electrically connected to the transmitting resonant circuit, the power full bridge is used to convert the DC voltage of the external power supply into an AC voltage, and the transmitting resonant circuit is used to convert the AC voltage into magnetic field energy and radiate it into space.

[0072] The wireless charging transmitting module is generally fixedly connected to an external power supply, and the wireless charging receiving module 20 is generally arranged inside the smart mobile terminal. When the wireless charging receiving module 20 and the wireless charging transmitting module inside the smart mobile terminal are not placed in a standard manner and are far apart, the wireless charging receiving module 20 is often unable to receive the magnetic field energy of the wireless charging transmitting module, or the magnetic field energy received from the wireless charging transmitting module is relatively small, resulting in a wireless charging connection being unable to be established between the wireless charging receiving module 20 and the wireless charging transmitting module.

[0073] In view of this, an embodiment of the present application provides a rectifier boost circuit, which increases the input voltage of the wireless charging receiving module 20, thereby enhancing the coupling voltage of the wireless charging receiving module 20, so that even devices to be charged that are not placed in a standardized manner can also be wirelessly charged, effectively improving the user's freedom of wireless charging and enhancing the user's wireless charging experience.

[0074] Combine the following Figure 4 , firstly, the problem that the wireless charging receiving module 20 and the wireless charging transmitting module are not placed properly, resulting in the inability to establish wireless charging, is introduced in detail.

[0075] Figure 4 This is a schematic diagram of a structure in which the wireless charging receiving module provided in an embodiment of the present application is not placed in a standardized manner.

[0076] like Figure 4As shown, in an embodiment provided by the present application, when wireless charging is required, it is generally required that the center of the receiving coil of the wireless charging receiving module 20 corresponds to the center of the transmitting coil of the wireless charging transmitting module, or is within a certain range, so that the wireless charging receiving module 20 can receive a rectified output voltage greater than or equal to the ping process, thereby establishing a wireless charging connection with the wireless charging transmitting module. When the center of the receiving coil of the wireless charging receiving module 20 is far away from the center of the transmitting coil of the wireless charging transmitting module, the wireless charging receiving module 20 cannot couple to the magnetic field energy of the wireless charging transmitting module, thereby failing to establish a wireless charging connection with the wireless charging transmitting module. For example, when a mobile phone is not placed properly in a wireless charger, the center of the receiving coil of the wireless charging receiving module 20 inside the mobile phone is far away from the center of the transmitting coil of the wireless charging transmitting module of the wireless charger, the mobile phone cannot establish a connection with the wireless charger, and the wireless charger cannot wirelessly charge the mobile phone.

[0077] Therefore, in order to solve the problem that the mobile phone and the wireless charger are not placed properly and wireless charging cannot be achieved in the embodiments of the present application, the present application provides a rectifier boost circuit, which increases the input voltage of the rectifier bridge module in the mobile phone, thereby enhancing the rectifier output voltage, so that wireless charging can also be achieved for devices to be charged that are not placed properly, effectively improving the user's freedom of wireless charging and enhancing the user's wireless charging experience.

[0078] Combine the following Figures 5 to 12 , and then a solution for enhancing the rectifier output voltage of the wireless charging receiving module is introduced in detail.

[0079] Figure 5 A schematic diagram of the structure of a rectifier and boost circuit provided in an embodiment of the present application.

[0080] like Figure 5 As shown, the embodiment of the present application provides a rectifier boost circuit 50, including a rectifier bridge module 501 and a boost module 502, which is applied between a resonance module 503 and a control chip 504 without a fixed power supply. Among them, the resonance module 503 is used to convert the magnetic field energy of the external space into an AC voltage, and the rectifier bridge module 501 is electrically connected to the resonance module 503 and the control chip 504 respectively, and is used to convert the external AC voltage into a DC voltage and obtain an output voltage. When the output voltage is greater than or equal to a preset value, the control chip 504 is started, so that the wireless charging receiving module 20 starts the wireless charging process with the wireless charging transmitting module.

[0081] The boost module 502 is electrically connected to the rectifier bridge module 501 and the control chip 504 respectively, and is used to be turned on when the output voltage is less than a preset value, and the rectifier bridge module 501 works in a half-bridge mode to allow the resonance module 503 to store energy, so as to increase the output voltage of the rectifier bridge module 501 to facilitate starting the control chip 504, so that the wireless charging receiving module 20 starts the wireless charging process with the wireless charging transmitting module. The boost module 502 is also used to be disconnected when the output voltage is greater than or equal to a preset value, so that the rectifier bridge module 501 works in a full-bridge mode to restore the rectification efficiency.

[0082] In an embodiment of the present application, for example, during the wireless charging process, when the user places the mobile phone in the standard position of the wireless charger, the AC voltage that can be obtained at the input end of the rectifier bridge module 501 is relatively high, so that the output voltage after rectification by the rectifier bridge module 501 is also relatively high. When the output voltage is greater than or equal to the preset value, the control chip 504 is started by the output voltage, so that the control chip 504 can exchange information with the wireless charging transmitter module, thereby realizing the wireless charging process.

[0083] When the user places the mobile phone in an irregular position on the wireless charger, the AC voltage that can be obtained at the input end of the rectifier bridge module 501 is low, so that the output voltage after rectification by the rectifier bridge module 501 is also low. When the output voltage is less than the preset value, the control chip 504 cannot be started. At this time, the boost module 502 is turned on, so that the rectifier bridge module 501 works in half-bridge mode, so that the resonance module 503 starts to store energy according to the signal characteristics of the AC voltage, increases the input voltage of the rectifier bridge module 501, and obtains the increased output voltage after rectification by the rectifier bridge module 501. When the increased output voltage is greater than or equal to the preset value, the control chip 504 is started by the increased output voltage, so that the control chip 504 can exchange information with the wireless charging transmitter module, thereby realizing the wireless charging process.

[0084] Exemplarily, the preset value may be a startup voltage value of the control chip 504 .

[0085] In another embodiment provided by the present application, when the control chip 504 is started according to the increased output voltage, that is, when the output voltage of the rectifier bridge module 501 is greater than or equal to the preset value, the boost module 502 is disconnected, so that the rectifier bridge module 501 works in full-bridge mode, thereby restoring the full-bridge rectification efficiency of the rectifier bridge module 501. Therefore, when the user places the mobile phone in an irregular position on the wireless charger and the control chip 504 is not started, according to the rectifier boost circuit provided by the present application, the output voltage of the rectifier bridge module 501 can be increased, which is more conducive to starting the control chip 504, so that the mobile phone placed irregularly can also achieve wireless charging, effectively improving the user's freedom of wireless charging and improving the user's wireless charging experience.

[0086] It should be noted that the rectifier boost circuit of the present application is always in the default on state before the mobile phone starts wireless charging, that is, the boost module 502 in the rectifier boost circuit is always in the default on state, so that the resonance module 503 is in the voltage doubling rectification mode by default. When the mobile phone is close to the wireless charger, the voltage doubling rectification mode obtained by the boost module 502 and the resonance module 503 effectively improves the output voltage of the rectifier bridge module 501 after rectification, which is more conducive to starting the control chip 504, so that the control chip 504 starts the wireless charging program, so that the mobile phone and the wireless charger establish a wireless charging connection.

[0087] At the same time, when the mobile phone has established a wireless charging connection with the wireless charger, the boost module 502 can be actively controlled to disconnect, so that the resonance module 503 exits the voltage doubling rectification mode and the rectifier bridge module 501 enters the full-bridge rectification mode, thereby effectively improving the rectification efficiency of the rectifier bridge module 501 during the wireless charging process.

[0088] Figure 6 A circuit diagram of a rectifier and boost circuit provided in an embodiment of the present application.

[0089] like Figure 6 As shown, in an embodiment provided in the present application, the resonance module 503 includes a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is electrically connected to one end of the first capacitor C1, and the other end of the first inductor L1 and the other end of the first capacitor C1 are electrically connected to the rectifier bridge module 501 respectively.

[0090] In the embodiment of the present application, the first inductor L1 and the first capacitor C1 form a resonant circuit for converting magnetic field energy in space into an AC voltage. Exemplarily, the first inductor L1 is a wireless charging receiving coil in the wireless charging receiving module 20 .

[0091] It should be noted that the series resonant frequency obtained by connecting the first inductor L1 and the first capacitor C1 in series needs to be greater than or equal to the operating frequency of the rectifier bridge module 501 , so that the rectifier bridge module 501 can operate according to the higher frequency AC voltage of the resonance module 503 .

[0092] In another embodiment of the present application, the resonance module 503 may further include a second capacitor C2, one end of the second capacitor C2 is electrically connected to the other end of the first capacitor C1, and the other end of the second capacitor C2 is electrically connected to the other end of the first inductor L1.

[0093] In the embodiment of the present application, the second capacitor C2 is used to cooperate with the first inductor L1 and the first capacitor C1 to form a resonant circuit, which is used to filter the AC voltage obtained by the resonant circuit.

[0094] At the same time, it should be noted that the second capacitor C2 is connected in parallel with the series circuit consisting of the first inductor L1 and the first capacitor C1, so that the obtained parallel resonant frequency is much lower than the operating frequency of the rectifier bridge module 501, preventing the AC voltage obtained by the resonant circuit from flowing through the second capacitor C2.

[0095] like Figure 6 As shown, in an embodiment provided by the present application, the rectifier bridge module 501 includes a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3 and a fourth MOS tube Q4. The source of the first MOS tube Q1 and the drain of the fourth MOS tube Q4 are both electrically connected to one end of the resonance module 503, the drain of the first MOS tube Q1 and the drain of the second MOS tube Q2 are both electrically connected to one end of the boost module 502, the source of the second MOS tube Q2 and the drain of the third MOS tube Q3 are both electrically connected to the other end of the boost module 502, and the source of the third MOS tube Q3 is electrically connected to the source of the fourth MOS tube Q4.

[0096] In the embodiment of the present application, the first MOS transistor Q1 , the second MOS transistor Q2 , the third MOS transistor Q3 and the fourth MOS transistor Q4 constitute a rectifier bridge module 501 for performing full-bridge rectification on the input AC signal to obtain a rectified DC voltage for starting the control chip 504 .

[0097] It should be noted that, in order to have lower on-resistance, the first MOS transistor Q1 , the second MOS transistor Q2 , the third MOS transistor Q3 and the fourth MOS transistor Q4 are generally enhanced MOS transistors, for example, enhanced NMOS transistors.

[0098] like Figure 6 As shown, in an embodiment provided in the present application, the boost module 502 includes a fifth MOS tube Q5 and a buck device 5021; the source of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2 through the buck device 5021, the drain of the fifth MOS tube Q5 is electrically connected to the source of the second MOS tube Q2, and the gate of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2.

[0099] It should be noted that the fifth MOS tube Q5 generally adopts a P-channel depletion type MOS tube, so that when the gate-source voltage Vgs of the fifth MOS tube Q5 is zero or negative, the channel between the gate and the drain already exists and is turned on. When the gate-source voltage Vgs of the fifth MOS tube Q5 is greater than or equal to the gate-source disconnection voltage Vgs (off), the communication between the gate and the drain can be completely disconnected. In other words, when the mobile phone is not placed in the wireless charger or the wireless charging connection is not established with the wireless charger, the fifth MOS tube Q5 in the wireless charging receiving module 20 is in the on state, and when the mobile phone is placed in a certain range of the wireless charger and the output voltage of the rectifier bridge module 501 is greater than the preset value (i.e., the starting voltage of the control chip 504), the fifth MOS tube is disconnected, so that the rectifier bridge module 501 restores the full-bridge rectification efficiency.

[0100] In the embodiment of the present application, when the fifth MOS tube Q5 is turned on, the output voltage Vrect of the rectifier bridge module 501 returns to the resonance module 503 via the fifth MOS tube Q5 and the buck device 5021, thereby storing energy for the resonance module 503 according to the positive and negative cycles of the AC voltage, increasing the input voltage of the rectifier bridge module 501, and then increasing the output voltage Vrect of the rectifier bridge module 501, so as to start the control chip 504.

[0101] It should be noted that the fifth MOS tube Q5 can be controlled by the control chip 504. When the output voltage Vrect of the rectifier bridge module 501 is less than the preset value, the fifth MOS tube Q5 is turned on by default. When the output voltage Vrect of the rectifier bridge module 501 is greater than or equal to the preset value, the fifth MOS tube Q5 is disconnected. Therefore, when the output voltage Vrect of the rectifier bridge module 501 does not reach the preset value, the resonance module 503 can be a voltage doubling rectifier circuit to increase the output voltage Vrect of the rectifier bridge module 501. When the output voltage Vrect of the rectifier bridge module 501 reaches the preset value, the rectifier bridge module 501 can enter the full-bridge rectification mode again to achieve high-efficiency rectification, and increase the transmission power of wireless charging through a larger current.

[0102] Figure 7 This is a circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application.

[0103] like Figure 7 As shown, in one embodiment provided in the present application, illustratively, the output voltage of the first inductor L1 in the resonance module 503 is When the sine wave is in the positive half cycle (i.e., the AC1-AC2 of the rectifier bridge module 501 is positive), the first inductor L1 is positive at the top and negative at the bottom. The positive output AC voltage of the first inductor L1 (i.e., the wireless charging receiving coil) flows back to the negative electrode of the first inductor L1 after passing through the first capacitor C1, the first MOS tube Q1 and the boost module 502 (i.e., the buck device 5021 and the fifth MOS tube Q5). At this time, the rectifier bridge module 501 is in the half-bridge rectification mode, and the first inductor L1 charges the first capacitor C1, so that the first capacitor C1 obtains the first voltage drop U1.

[0104] It should be noted that, under ideal conditions, the first pressure drop U1 is close to the original pressure drop U0.

[0105] Figure 8 This is a circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application.

[0106] like Figure 8 As shown, in an embodiment provided by the present application, exemplarily, when the sine wave is in the negative half cycle (i.e., the AC1-AC2 of the rectifier bridge module 501 is a negative cycle), the first inductor L1 is negative at the top and positive at the bottom. The positive output AC voltage of the first inductor L1 (i.e., the wireless charging receiving coil) flows back to the negative electrode of the first inductor L1 after passing through the second MOS tube Q2 and the boost module 502 (i.e., the fifth MOS tube Q5 and the buck device 5021), the third capacitor C3, the fourth MOS tube Q4 and the first capacitor C1. At this time, the rectifier bridge module 501 is in the half-bridge rectification mode, and the voltage of the first inductor L1 and the voltage of the first capacitor C1 are in the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltage across the first inductor L1 and the voltage across the first capacitor C1, i.e., U1+U0, that is, the voltage doubling rectification of the rectifier bridge module 501 is realized.

[0107] When the output voltage of the rectifier bridge module 501 is greater than or equal to the preset value, the control chip 504 starts. In response to the ping signal of the wireless charging transmitter module, the control chip 504 controls the gate-source voltage Vgs of the fifth MOS tube Q5 to turn off the fifth MOS tube, so that the rectifier bridge module 501 composed of the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3 and the fourth MOS tube Q4 enters the full-bridge rectification mode, and the resonance module 503 exits the voltage doubler rectification mode, so that the wireless charging receiving module 20 enters the high-power wireless charging state.

[0108] It should be noted that the preset value may be a startup voltage threshold of the control chip 504 .

[0109] Fig. 9 This is a circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application.

[0110] like Fig. 9 As shown, in an embodiment provided in the present application, illustratively, the rectifier boost circuit 50 includes a rectifier bridge module 501 and a boost module 502. The boost module 502 includes a fifth MOS tube Q5 and a buck device 5021. The buck device 5021 may include a first resistor R1, and the first resistor R1 is connected between the source of the fifth MOS tube Q1 and the drain of the second MOS tube Q5. The source of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2 through the first resistor R1, the drain of the fifth MOS tube Q5 is electrically connected to the source of the second MOS tube Q2, and the gate of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2.

[0111] In the embodiment of the present application, the fifth MOS tube Q5 and the first resistor R1 are connected in series and then in parallel with the second MOS tube Q2. When the user places the mobile phone in the wireless charger improperly, the output voltage of the rectifier bridge module 501 is less than the start-up voltage of the control chip 504. At this time, since the fifth MOS tube Q5 is turned on by default, when the AC voltage output by the first inductor L1 (i.e., the wireless charging receiving coil) of the resonance module 503 is in the positive half cycle, the AC voltage flows from the positive electrode of the first inductor L1 through the first capacitor C1, the first MOS tube Q1, the first resistor R1 and the fifth MOS tube Q5, and then flows back to the negative electrode of the first inductor L1. In this process, the first inductor L1 charges the first capacitor C1, so that the first capacitor C1 obtains the first voltage drop U1.

[0112] When the AC voltage output by the first inductor L1 of the resonance module 503 is in the negative half cycle, the AC voltage flows from the positive electrode of the first inductor L1 through the second MOS transistor Q2, the fifth MOS transistor, the first resistor R1, the third capacitor C3, the fourth MOS transistor Q4 and the first capacitor C1, and then flows back to the negative electrode of the first inductor L1. At this time, the voltage of the first inductor L1 and the voltage of the first capacitor C1 have the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltage across the first inductor L1 and the voltage across the first capacitor C1, that is, U1+U0, thereby realizing the voltage doubling rectification of the rectifier bridge module 501, so that the output voltage of the rectifier bridge module 501 is also approximately doubled, which is more conducive to turning on the control chip 504.

[0113] Further, when the control chip 504 in the user's mobile phone has been turned on and a wireless connection has been established with the wireless charger, the output voltage Vrect of the rectifier bridge module 501 is relatively large, which increases the gate voltage of the fifth MOS tube, and the first resistor R1 will cause a voltage drop on the source voltage of the fifth MOS tube, thereby increasing the gate-source voltage of the fifth MOS tube. When the gate-source voltage Vgs of the fifth MOS tube is greater than or equal to the gate-source disconnection voltage Vgs (off), the fifth MOS tube Q5 is automatically turned off, so that the fifth MOS tube Q5 is turned on when the mobile phone has not established a wireless charging connection with the wireless charger, so that the resonance module 503 forms a voltage doubling rectification circuit, increases the output voltage of the rectifier bridge module 501, and starts the control chip 504 as much as possible. When the mobile phone has established a wireless charging connection with the wireless charger and then disconnects, the resonance module 503 exits the voltage doubling rectification circuit, and then the rectifier bridge module 501 resumes the full-bridge rectification mode, and the wireless charging process is performed with a relatively high-power rectification voltage.

[0114] Compared with the traditional rectifier bridge module 501, the boost module 502 can start the control chip 504 inside the mobile phone even when the user's mobile phone and the wireless charger are not placed properly, which effectively increases the user's freedom to wirelessly charge the mobile phone and improves the user experience.

[0115] Fig.10 This is a circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application.

[0116] like Fig.10 As shown, in an embodiment provided by the present application, illustratively, the rectifier boost circuit 50 includes a rectifier bridge module 501 and a boost module 502. The boost module 502 includes a fifth MOS tube Q5 and a buck device 5021. The buck device 5021 includes a first diode D1, the anode of the first diode D1 is electrically connected to the drain of the second MOS tube Q2, and the cathode of the first diode D1 is electrically connected to the source of the fifth MOS tube Q5. The source of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2 through the first diode D1, the drain of the fifth MOS tube Q5 is electrically connected to the source of the second MOS tube Q2, and the gate of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2.

[0117] In the embodiment of the present application, the fifth MOS tube Q5 and the first diode D1 are connected in series and then in parallel with the second MOS tube Q2. When the user places the mobile phone in the wireless charger improperly, the output voltage of the rectifier bridge module 501 is less than the start-up voltage of the control chip 504. At this time, since the fifth MOS tube Q5 is turned on by default, when the AC voltage output by the first inductor L1 (i.e., the wireless charging receiving coil) of the resonance module 503 is in the positive half cycle, the AC voltage flows from the positive electrode of the first inductor L1 through the first capacitor C1, the first MOS tube Q1, the first diode D1 and the fifth MOS tube Q5 and then flows back to the negative electrode of the first inductor L1. In this process, the first inductor L1 charges the first capacitor C1, so that the first capacitor C1 obtains the first voltage drop U1.

[0118] When the AC voltage output by the first inductor L1 of the resonance module 503 is in the negative half cycle, the AC voltage flows from the positive electrode of the first inductor L1 through the second MOS transistor Q2, the fifth MOS transistor, the first diode D1, the third capacitor C3, the fourth MOS transistor Q4 and the first capacitor C1, and then flows back to the negative electrode of the first inductor L1. At this time, the voltage of the first inductor L1 and the voltage of the first capacitor C1 have the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltage across the first inductor L1 and the voltage across the first capacitor C1, that is, U1+U0, thereby realizing the voltage doubling rectification of the rectifier bridge module 501, so that the output voltage of the rectifier bridge module 501 is also approximately doubled, which is more conducive to starting the control chip 504.

[0119] Further, when the control chip 504 in the user's mobile phone has been turned on and a wireless connection has been established with the wireless charger, the output voltage Vrect of the rectifier bridge module 501 is relatively large, which increases the gate voltage of the fifth MOS tube, and the first diode D1 will cause a voltage drop on the source voltage of the fifth MOS tube, thereby increasing the gate-source voltage of the fifth MOS tube. When the gate-source voltage Vgs of the fifth MOS tube is greater than or equal to the gate-source disconnection voltage Vgs (off), the fifth MOS tube Q5 is automatically turned off, so that the fifth MOS tube Q5 is turned on when the mobile phone has not established a wireless charging connection with the wireless charger, so that the resonance module 503 forms a voltage doubling rectification circuit, increases the output voltage of the rectifier bridge module 501, and starts the control chip 504 as much as possible. When the mobile phone has established a wireless charging connection with the wireless charger and then disconnects, the resonance module 503 exits the voltage doubling rectification circuit, and then the rectifier bridge module 501 resumes the full-bridge rectification mode, and the wireless charging process is performed with a relatively high-power rectification voltage.

[0120] Compared with the traditional rectifier bridge module 501, the boost module 502 can start the control chip 504 inside the mobile phone even when the user's mobile phone and the wireless charger are not placed properly, which effectively increases the user's freedom to wirelessly charge the mobile phone and improves the user experience.

[0121] Fig.11 This is a circuit diagram of a rectifier and boost circuit provided in yet another embodiment of the present application.

[0122] like Fig.11 As shown, in one embodiment provided in the present application, the rectifier boost circuit 50 includes a rectifier bridge module 501 and a boost module 502. The boost module 502 includes a fifth MOS tube Q5 and a buck device 5021. The boost module 502 includes a fifth MOS tube Q5 and a voltage measurement and control chip U2; the source of the fifth MOS tube Q5 is electrically connected to the drain of the second MOS tube Q2, the drain of the fifth MOS tube Q5 is electrically connected to the source of the second MOS tube Q2, and the voltage measurement and control chip U2 is electrically connected to the gate of the fifth MOS tube Q5 and the source of the fifth MOS tube Q5, respectively.

[0123] In the embodiment of the present application, when the user places the mobile phone in the wireless charger improperly, the output voltage of the rectifier bridge module 501 is less than the start-up voltage of the control chip 504. At this time, since the fifth MOS tube Q5 is turned on by default, when the AC voltage output by the first inductor L1 (i.e., the wireless charging receiving coil) of the resonance module 503 is in the positive half cycle, the AC voltage flows from the positive electrode of the first inductor L1 through the first capacitor C1, the first MOS tube Q1 and the fifth MOS tube Q5 and then flows back to the negative electrode of the first inductor L1. In this process, the first inductor L1 charges the first capacitor C1, so that the first capacitor C1 obtains the first voltage drop U1.

[0124] When the AC voltage output by the first inductor L1 of the resonance module 503 is in the negative half cycle, the AC voltage flows from the positive electrode of the first inductor L1 through the second MOS tube Q2, the fifth MOS tube, the third capacitor C3, the fourth MOS tube Q4 and the first capacitor C1, and then flows back to the negative electrode of the first inductor L1. At this time, the voltage of the first inductor L1 and the voltage of the first capacitor C1 have the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltage across the first inductor L1 and the voltage across the first capacitor C1, that is, U1+U0, thereby realizing the voltage doubling rectification of the rectifier bridge module 501, so that the output voltage of the rectifier bridge module 501 is also approximately doubled, which is more conducive to starting the control chip 504.

[0125] Furthermore, when the control chip 504 in the user's mobile phone has been turned on and a wireless connection has been established with the wireless charger, when the voltage measurement and control chip U2 detects that the output voltage of the rectifier bridge module 501 is greater than the preset value, the voltage measurement and control chip U2 controls the fifth MOS tube Q5 to be disconnected, so that the fifth MOS tube Q5 is turned on when the mobile phone has not established a wireless charging connection with the wireless charger, so that the resonance module 503 forms a voltage doubling rectifier circuit, increases the output voltage of the rectifier bridge module 501, and starts the control chip 504 as much as possible. When the mobile phone is disconnected after establishing a wireless charging connection with the wireless charger, the resonance module 503 exits the voltage doubling rectifier circuit, and then the rectifier bridge module 501 restores the full-bridge rectifier mode, and performs the wireless charging process with a higher power rectifier voltage. Compared with the traditional rectifier bridge module 501, the boost module 502 can start the control chip 504 inside the mobile phone even when the user's mobile phone and the wireless charger are not placed properly, which effectively improves the user's freedom to wirelessly charge the mobile phone and improves the user experience.

[0126] Fig.12 This is a waveform diagram of a rectifier and boost circuit provided in an embodiment of the present application.

[0127] like Fig.12 As shown, exemplarily, when the wireless charging receiving module 20 does not adopt the rectifier boost circuit provided in the embodiment of the present application, the maximum value of the original voltage output by the rectifier bridge module 501 after rectification is about 7V. When the wireless charging receiving module 20 adopts the rectifier boost circuit (Q5+D1 scheme) provided in one embodiment of the present application, the maximum value of the output voltage of the rectifier bridge module 501 after rectification is about 9V. When the wireless charging receiving module 20 adopts the rectifier boost circuit (Q5+R1 scheme) provided in another embodiment of the present application, the maximum value of the output voltage of the rectifier bridge module 501 after rectification is about 9V. When the wireless charging receiving module 20 adopts the rectifier boost circuit (Q5+U2 scheme) provided in another embodiment of the present application, the maximum value of the output voltage of the rectifier bridge module 501 after rectification is about 9V. Therefore, it can be seen from the waveform diagram that the output voltage of the rectifier bridge module 501 after rectification can be significantly improved by adopting the rectifier boost circuit of the present application.

[0128] In addition, after many experimental tests, it was found that when a mobile phone is placed improperly on a wireless charger and attempted to be charged wirelessly, the use of the rectifier boost circuit of the present application can effectively increase the offset angle of the mobile phone's wireless charging receiving coil relative to the wireless charging transmitting coil of the wireless charger, thereby effectively improving the freedom of the mobile phone for wireless charging and enhancing the user experience.

[0129] Fig.13 A circuit diagram of a wireless charging receiving module provided in an embodiment of the present application.

[0130] like Fig.13 As shown, the embodiment of the present application provides a wireless charging receiving module 20, including a resonance module 503, a control chip 504 without a fixed power supply, and a rectifier boost circuit 50; the rectifier boost circuit 50 is electrically connected to the resonance module 503 and the control chip 504 respectively. The resonance module 503 is used to convert electromagnetic energy in space into AC voltage; the rectifier boost circuit 50 is used to convert AC voltage into DC voltage, and increase the DC voltage when the DC voltage is less than a preset value, and the control chip 504 is used to control the wireless charging process of the wireless charging receiving end.

[0131] In the embodiment of the present application, when the user places the mobile phone on the wireless charger, the resonance module 503 converts the magnetic field energy generated by the wireless charger in space into an AC voltage, the rectification and boosting circuit 50 is turned on by default, so that the resonance module 503 enters a voltage doubling rectification state, and the rectifier bridge module 501 rectifies in a half-bridge mode, thereby converting the AC voltage into a DC voltage and increasing the DC voltage to start the control chip 504. After the control chip 504 is started, the rectification and boosting circuit 50 is disconnected, so that the rectifier bridge module 501 rectifies in a full-bridge mode, and restores a higher rectification efficiency, so that the charging device that is not placed in a standard manner can also achieve wireless charging, which greatly improves the user's freedom of wireless charging and improves the user's wireless charging experience.

[0132] Furthermore, the wireless charging receiving module 20 also includes a low dropout regulator (LDO), a fourth capacitor C4 and a load, one end of the low dropout regulator is electrically connected to one end of the rectifier bridge module 501, the other end of the low dropout regulator is electrically connected to the fourth capacitor C4 and one end of the load respectively, and the other end of the fourth capacitor C4 and the other end of the load are both electrically connected to the other end of the rectifier bridge module 501.

[0133] In the embodiment of the present application, the low voltage dropout regulator is used to stabilize the output voltage of the rectifier boost circuit 50, and the fourth capacitor C4 is used to filter the output voltage of the rectifier boost circuit 50. The load can be a battery or a power-consuming device for storing or receiving the output voltage of the rectifier boost circuit 50.

[0134] The embodiment of the present application also provides a wireless charging chip, including the wireless charging receiving module 20 as described above, and the wireless charging receiving module 20 includes the above-mentioned rectifier boost circuit 50. When the device to be charged is not placed in a standard position on the wireless charger, the input voltage of the rectifier bridge module can be increased by the boost module, thereby enhancing the rectifier output voltage, so that the device to be charged that is not placed in a standard position can also be wirelessly charged, effectively improving the user's freedom of wireless charging and improving the user's wireless charging experience.

[0135] The embodiment of the present application also provides an electronic device, including the wireless charging receiving module 20 as described above, and the wireless charging receiving module 20 includes the above-mentioned rectifier boost circuit 50. When the device to be charged is not placed in a standard position on the wireless charger, the input voltage of the rectifier bridge module can be increased by the boost module, thereby enhancing the rectifier output voltage, so that the device to be charged that is not placed in a standard position can also be wirelessly charged, effectively improving the user's freedom of wireless charging and improving the user's wireless charging experience.

[0136] It should be understood that the above is only an example of the structure of the electronic device 100, and the electronic device 100 may also include other subsystems or devices, which can be configured and modified as needed, and the embodiments of the present application do not impose any limitations on this.

[0137] The beneficial effects that can be achieved by the electronic device provided in the above-mentioned embodiment of the present application can refer to the beneficial effects corresponding to the modules provided above, which will not be repeated here.

[0138] It should be understood that the above is only to help those skilled in the art to better understand the embodiments of the present application, rather than to limit the scope of the embodiments of the present application. According to the above examples given, those skilled in the art can obviously make various equivalent modifications or changes. For example, some steps in each embodiment of the above detection method may be unnecessary, or some steps may be newly added. Or a combination of any two or any multiple embodiments of the above. Such modifications, changes or combined solutions also fall within the scope of the embodiments of the present application. In addition, the coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0139] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0140] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0141] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced to each other. For the sake of brevity, they will not be repeated here.

[0142] It should also be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0143] It should also be understood that in the embodiments of the present application, "pre-setting" and "pre-definition" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including an electronic device), and the present application does not limit its specific implementation method.

[0144] It should also be understood that the division of the methods, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various methods, categories, situations and embodiments can be combined without contradiction.

[0145] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0146] Finally, it should be noted that the above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims. In short, the above is only a preferred embodiment of the technical solution of the present application, and is not used to limit the protection scope of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rectifier boost circuit, applied to a resonant module and a control chip without a fixed power supply, characterized in that: Including rectifier bridge module and boost module; The rectifier bridge module is electrically connected to the resonance module and the control chip respectively, and is configured to convert an external AC voltage into a DC voltage and obtain an output voltage, and start the control chip when the output voltage is greater than or equal to a preset value; The boost module is electrically connected to the rectifier bridge module and the control chip respectively, and is configured to be turned on when the output voltage is less than the preset value, and the rectifier bridge module works in a half-bridge mode to enable the resonance module to store energy, so as to increase the output voltage of the rectifier bridge module to facilitate starting the control chip; The rectifier bridge module includes a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube; The source of the first MOS tube and the drain of the fourth MOS tube are both electrically connected to one end of the resonance module, the drain of the first MOS tube and the drain of the second MOS tube are both electrically connected to one end of the boost module, the source of the second MOS tube and the drain of the third MOS tube are both electrically connected to the other end of the boost module, and the source of the third MOS tube is electrically connected to the source of the fourth MOS tube; The boost module includes a fifth MOS tube and a voltage-reducing device; The source of the fifth MOS tube is electrically connected to the drain of the second MOS tube through the step-down device, the drain of the fifth MOS tube is electrically connected to the source of the second MOS tube, and the gate of the fifth MOS tube is electrically connected to the drain of the second MOS tube.

2. The rectifier boost circuit according to claim 1, characterized in that: The boost module is further configured to be disconnected when the output voltage is greater than or equal to the preset value, so that the rectifier bridge module operates in a full-bridge mode to restore the rectification efficiency.

3. The rectifier boost circuit according to claim 1, characterized in that: The voltage-reducing device comprises a first resistor; the first resistor is connected between the source of the fifth MOS tube and the drain of the second MOS tube.

4. The rectifier boost circuit according to claim 1, characterized in that: The voltage-reducing device comprises a first diode; an anode of the first diode is electrically connected to a drain of the second MOS tube, and a cathode of the first diode is electrically connected to a source of the fifth MOS tube.

5. The rectifier boost circuit according to any one of claims 1 to 4, characterized in that: The fifth MOS tube comprises a P-channel depletion type MOS tube.

6. The rectifier and boost circuit according to any one of claims 1 to 4, characterized in that: The resonance module includes a first inductor and a first capacitor; One end of the first inductor is electrically connected to one end of the first capacitor, and the other end of the first inductor and the other end of the first capacitor are electrically connected to the rectifier bridge module respectively.

7. A wireless charging receiving module, characterized in that: It comprises a resonance module, a control chip without a fixed power supply, and a rectifier boost circuit according to any one of claims 1 to 6; the rectifier boost circuit is electrically connected to the resonance module and the control chip respectively; The resonance module is configured to convert electromagnetic energy in space into alternating current voltage; The control chip is configured to control the wireless charging process of the wireless charging receiving end.

8. A wireless charging receiving chip, characterized in that: It includes the wireless charging receiving module as claimed in claim 7.

9. An electronic device, characterized in that: Including the wireless charging receiving chip as described in claim 8.

Images