CN117997148A

CN117997148A - Rectifying and boosting circuit, wireless charging receiving module, chip and electronic equipment

Info

Publication number: CN117997148A
Application number: CN202410399225.2A
Authority: CN
Inventors: 黄华; 宋佳祥
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2024-04-03
Filing date: 2024-04-03
Publication date: 2024-05-07

Abstract

The application discloses a rectifying and boosting circuit, a wireless charging receiving module, a chip and electronic equipment, and relates to the technical field of wireless charging, wherein the rectifying and boosting circuit comprises a rectifying bridge module and a boosting module; the rectifier bridge module is used for converting external alternating voltage into direct voltage and obtaining output voltage, and starting the control chip when the output voltage is greater than or equal to a preset value; the boosting module is used for being conducted when the output voltage is smaller than a preset value, the rectifier bridge module works in a half-bridge mode to enable the resonance module to store energy, and therefore the output voltage of the rectifier bridge module is increased to enable the control chip to be started conveniently. Based on the scheme of the application, when the placement position of the equipment to be charged in the wireless charger is not standard, the input voltage of the rectifier bridge module can be increased through the supercharging module, so that the rectification output voltage is enhanced, the equipment to be charged which is not standard can also realize wireless charging, the degree of freedom of wireless charging of a user is effectively improved, and the wireless charging experience of the user is improved.

Description

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

Technical Field

The application relates to the technical field of wireless charging, in particular to a rectifying and boosting circuit, a wireless charging receiving module, a chip and electronic equipment.

Background

The wireless charging technology is a technology capable of realizing a charging process between a power supply end and a charging end without connecting wires. With the advancement of technology, wireless charging technology has become more and more mature, and is widely applied to various intelligent terminal products, such as mobile phones, computers, electric automobiles and the like.

When the wireless charging technology is applied to a mobile phone, the wireless charging is generally performed by adopting a mode of electromagnetic coupling between a transmitting end coil in a wireless charger and a receiving end coil in the mobile phone. However, when the position of the mobile phone placed in the wireless charger by the user is not standard, that is, the center of the receiving end coil in the mobile phone is far away from the center of the transmitting end coil in the wireless charger, the coupling voltage is small, and wireless charging cannot be realized, so that the user needs to adjust the position of the mobile phone in the wireless charger for many times, the degree of freedom of wireless charging of the user is low, and the charging experience of the user is affected.

Therefore, a new solution is needed to solve the above-mentioned problems.

Disclosure of Invention

The application provides a rectifying and boosting circuit, a wireless charging receiving module, a chip and electronic equipment, wherein the input voltage of a rectifying bridge module is increased through the boosting module, so that the rectifying output voltage is enhanced, the wireless charging of the equipment to be charged which is not placed normally can be realized, the degree of freedom of wireless charging of a user is effectively improved, and the wireless charging experience of the user is improved.

In order to achieve the above purpose, the application adopts the following technical scheme:

In a first aspect, a rectifying and boosting circuit is provided, and is applied to a resonance module and a control chip without a fixed power supply, wherein the rectifying and boosting circuit comprises a rectifying bridge module and a boosting module; the rectifier bridge module is respectively and electrically connected with the resonance module and the control chip and is configured to convert external alternating voltage into direct voltage and obtain output voltage, and the control chip is started when the output voltage is greater than or equal to a preset value; the supercharging module is respectively and electrically connected with the rectifier bridge module and the control chip and is configured to be conducted when the output voltage is smaller 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 and enable the control chip to be started conveniently.

In the embodiment of the application, when the equipment to be charged tries to be charged with the wireless charger, the equipment to be charged starts the control chip and establishes wireless charging connection with the wireless charger when the output voltage of the rectifier bridge module in the equipment to be charged is larger than or equal to a preset value. When the output voltage of the rectifier bridge module in the equipment to be charged is smaller than a preset value, the equipment to be charged is not in the chargeable range of the wireless charger, the pressurizing module is conducted, the rectifier bridge module works in a half-bridge mode, and the resonance module stores energy, so that the input voltage and the output voltage of the rectifier module are increased, the starting control chip of the equipment to be charged is more facilitated, wireless charging connection with the wireless charger is established, the equipment to be charged which is not standardized is placed, wireless charging can be realized, the degree of freedom of wireless charging of a user is effectively improved, and the wireless charging experience of the user is improved.

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

It should be noted that the first inductor is typically a receiving charging coil in the device to be charged.

It should be noted that, the rectifier bridge module generally adopts a rectifier bridge composed of four MOS transistors.

With reference to the first aspect, in certain implementation manners of the first aspect, the boost module is further configured to be turned off 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 rectifier efficiency.

In this implementation, after the device to be charged has established a wireless charging connection with the wireless charger, the boost module is disconnected, so that the rectifier bridge module operates in a full-bridge mode, thereby recovering the full-bridge rectification efficiency of the rectifier bridge module, so as to increase the wireless charging power.

With reference to the first aspect, in certain implementation manners of the first aspect, the rectifier bridge module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor; the source electrode of the first MOS tube and the drain electrode of the fourth MOS tube are electrically connected with one end of the resonance module, the drain electrode of the first MOS tube and the drain electrode of the second MOS tube are electrically connected with one end of the pressurizing module, the source electrode of the second MOS tube and the drain electrode of the third MOS tube are electrically connected with the other end of the pressurizing module, and the source electrode of the third MOS tube and the source electrode of the fourth MOS tube are electrically connected.

In the implementation manner, the rectifier bridge module is formed by the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube and is used for rectifying the externally input alternating voltage, so that the alternating voltage is converted into the direct voltage, and the equipment to be charged is conveniently charged.

With reference to the first aspect, in certain implementations of the first aspect, the boosting module includes a fifth MOS transistor and a voltage reduction device; the source electrode of the fifth MOS tube is electrically connected with the drain electrode of the second MOS tube through the voltage reduction device, and the drain electrode of the fifth MOS tube is electrically connected with the source electrode of the second MOS tube.

In the implementation manner, when the output voltage of the rectifying module is smaller than a preset value, the fifth MOS tube is conducted, so that the rectifying module works in a half-bridge mode, the resonant module stores energy according to the alternating voltage, the output voltage of the rectifying module is continuously increased, and when the output voltage of the rectifying module is larger than or equal to the preset value, the control chip is started. The voltage reduction device is used for dividing voltage, and when the gate-source voltage of the fifth MOS tube is larger than the gate-source disconnection voltage, the fifth MOS tube is disconnected, so that the rectifying bridge module works in a full-bridge mode to recover the rectifying efficiency.

With reference to the first aspect, in certain implementations of the first aspect, the voltage step-down device includes a first resistor; the first resistor is connected between the source electrode of the fifth MOS tube and the drain electrode of the second MOS tube, and the grid electrode of the fifth MOS tube is electrically connected with the drain electrode of the second MOS tube.

In this implementation manner, the voltage reduction device may select a first resistor, and perform a voltage division function through the first resistor to assist in raising the gate-source voltage of the fifth MOS transistor.

With reference to the first aspect, in certain implementations of the first aspect, the voltage step-down device includes a first diode; the positive electrode of the first diode is electrically connected with the drain electrode of the second MOS tube, and the negative electrode of the first diode is electrically connected with the source electrode of the fifth MOS tube.

In this implementation manner, the voltage reduction device may select a first diode, and perform a voltage division function through the first diode to assist in raising the gate-source voltage of the fifth MOS transistor.

With reference to the first aspect, in certain implementation manners of the first aspect, the boosting module includes a fifth MOS transistor and a voltage measurement and control chip; the source electrode of the fifth MOS tube is electrically connected with the drain electrode of the second MOS tube, the drain electrode of the fifth MOS tube is electrically connected with the source electrode of the second MOS tube, and the voltage measurement and control chip is respectively and electrically connected with the grid electrode of the fifth MOS tube and the source electrode of the fifth MOS tube.

In the implementation manner, when the output voltage of the rectifying module is smaller than a preset value, the fifth MOS tube is conducted, so that the rectifying module works in a half-bridge mode, the resonant module stores energy according to the alternating voltage, the output voltage of the rectifying module is continuously increased, and when the output voltage of the rectifying module is larger than or equal to the preset value, the control chip is started. The control chip controls the output voltage of the rectifying module to be detected through the voltage measurement and control chip, and when the output voltage of the rectifying module is larger than a preset value, the fifth MOS tube is disconnected, so that the rectifying bridge module works in a full bridge mode to recover the rectifying efficiency.

With reference to the first aspect, in certain implementation manners of the first aspect, the fifth MOS transistor includes a P-channel depletion MOS transistor.

In the implementation manner, the fifth MOS transistor can be a P-channel depletion MOS transistor, and the P-channel depletion MOS transistor is conducted when the gate-source voltage is 0 or negative pressure, so that the fifth MOS transistor is conducted when the fifth MOS transistor is not conducted. When the voltage of the gate source electrode is larger than the gate source electrode disconnection voltage, the fifth MOS tube is disconnected when the output voltage of the rectifying module is larger than a preset value, and the full-bridge rectifying efficiency of the rectifying module is recovered.

With reference to the first aspect, in certain implementations of the first aspect, the resonant module includes a first inductance and a first capacitance; one end of the first inductor is electrically connected with 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 with the rectifier bridge module.

In this implementation, the first inductor is used as a receiving coil and is used for inducing electromagnetic energy in a space, and the first inductor and the first capacitor are matched to form a resonant circuit to convert the electromagnetic energy into alternating voltage for use by a subsequent rectifying and boosting circuit.

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

In the embodiment of the application, when the equipment to be charged tries to be charged with the wireless charger, the resonance module is used for converting electromagnetic energy in the space into alternating voltage, the rectification boosting circuit is used for rectifying the alternating voltage into direct voltage, and the control chip is used for starting according to the direct voltage, so that the equipment to be charged and the wireless charger are charged wirelessly.

In a third aspect, a wireless charging receiving chip is provided, including the wireless charging receiving module.

In the embodiment of the application, the wireless charging receiving chip is used for attempting to start the wireless charging process when the equipment to be charged approaches to the wireless charger, so that the wireless charger can perform wireless charging on the equipment to be charged.

In a fourth aspect, an electronic device is provided that includes the wireless charging receiving chip.

In the embodiment of the application, the electronic device may be a device to be charged by way of example. The wireless charging receiving chip is used for attempting to start a wireless charging process when the equipment to be charged is close to the wireless charger, so that the wireless charger can perform wireless charging on the equipment to be charged.

Drawings

Fig. 1 is a schematic diagram of a scenario of wireless charging applicable to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a wireless charging receiving module according to an embodiment of the present application;

Fig. 4 is a schematic structural diagram of a wireless charging receiving module according to an embodiment of the present application;

Fig. 5 is a schematic structural diagram of a rectifying and boosting circuit according to an embodiment of the present application;

FIG. 6 is a circuit diagram of a rectifying and boosting circuit according to an embodiment of the present application;

FIG. 7 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application;

FIG. 8 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application;

FIG. 9 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application;

FIG. 10 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application;

FIG. 11 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application;

FIG. 12 is a waveform diagram of a rectifying and boosting circuit according to an embodiment of the present application;

Fig. 13 is a circuit diagram of a wireless charging receiving module according to an embodiment of the application.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly and thoroughly described below with reference to the accompanying drawings. Wherein, in the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.

The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In order to facilitate understanding of the embodiments of the present application, related concepts related to the embodiments of the present application will be briefly described.

1. Wireless charging technology (WIRELESS CHARGING technology, IC), in the field of electronic technology, originates from wireless power transmission technology and can be divided into two modes of low-power wireless charging and high-power wireless charging. Among them, the low-power wireless charging generally adopts an electromagnetic induction type, for example, qi mode for charging a mobile phone. High power wireless charging generally employs resonance, i.e., energy is transferred by a power supply (e.g., a charger) to an electrical device that charges a battery with the received energy and provides for its own operation. Because the charger and the electricity utilization device transmit energy by using a magnetic field, the charger and the electricity utilization device are not connected by using wires, and therefore, the charger and the electricity utilization device can be exposed without conductive contacts. For example, most electric vehicles are typically charged in this manner. However, a small portion of electric vehicles are charged by electromagnetic induction.

2. Electromagnetic coupling, also known as mutual inductance coupling, is a phenomenon in which current variation of one circuit affects another circuit due to mutual inductance existing between the two circuits. In particular, there is a close fit and interaction between the inputs and outputs of two or more circuit elements or electrical networks and energy is transferred from one side to the other by interaction, in general coupling means a measure of the mutual dependence of two entities on each other.

3. The wireless charging transmitting Terminal (TX) can be a wireless charging transmitter in the technical field of electronics, and comprises an MCU, a power full bridge and an LC resonant circuit formed by an inductor and a capacitor, wherein the inductor is a transmitting terminal coil. The input end of the wireless charging transmitting end is a direct current Voltage (DC Voltage), and the direct current Voltage generates an alternating current Voltage (AC Voltage), namely a square wave, through a power full bridge. Square wave loading produces an alternating Current (AC Current) across the LC tank, which generates a magnetic field through the coil, radiating the magnetic field energy into space.

4. The wireless charging receiving end (RX) can be a mobile phone with a wireless charging function and the like in the technical field of electronics, and comprises an MCU, a rectifier bridge, a low dropout linear regulator (Low Dropout Regulator, LDO), a charger chip, a battery and an LC resonant circuit, wherein an inductor is a receiving end coil. The wireless charging receiving end coil senses the energy of the space magnetic field, an LC resonant circuit at the receiving end generates alternating current, the alternating current is converted into direct current voltage through a rectifier bridge, and the direct current voltage charges a battery through the low-dropout linear voltage regulator and an electrical chip.

5. The voltage doubling rectifying circuit is a circuit capable of rectifying a lower alternating voltage to a higher direct voltage by using a rectifying diode and a capacitor with higher withstand voltage. For example, in some places where a high voltage and a small current are required, a voltage doubler rectifying circuit is often used. The voltage doubler rectifier circuit generally outputs a voltage that is more or less than the input voltage, the voltage-doubling rectifying circuit is divided into a voltage-doubling rectifying circuit, a voltage-tripling rectifying circuit, a voltage-doubling rectifying circuit and the like.

6. Internet packet explorer (PACKET INTERNET Groper, ping), a program for testing network connection quantity, often uses a "ping" command to check whether a network is unobstructed or the network connection speed, and can facilitate analysis and determination of network failure. The specific working principle is as follows: by utilizing the uniqueness of the machine IP address on the network, a data packet is sent to the target IP address, and the opposite side is required to return a data packet with the same size to determine whether two network machines are connected and communicated or not, and the time delay is what. For example, in the wireless charging process, when the wireless charging transmitting Terminal (TX) detects the wireless charging receiving terminal (RX), the wireless charging transmitting Terminal (TX) may send a signal (DIGITAL PING) with enough energy to start the communication function of the wireless charging receiving terminal (RX). The wireless charging receiving terminal (RX) responds to the signal strength indication packet, and after receiving the signal strength packet, the wireless charging transmitting Terminal (TX) maintains the power signal to enable the system to enter the next stage.

The foregoing is a simplified description of the terminology involved in the embodiments of the present application, and is not described in detail below.

Fig. 1 is a schematic diagram of a wireless charging scenario applicable to an embodiment of the present application.

As shown in fig. 1, a user may wirelessly charge electronic device 100 using wireless charging device 200. The type of the electronic device 100 is not particularly limited in the embodiment of the present application. In some embodiments, the electronic device 100 may be an IOT (internet of things ) device such as a cell phone, a wearable device (e.g., a smart bracelet, a smart watch, a headset, etc.), a tablet computer, a laptop computer (laptop), a handheld computer, a notebook computer, an ultra-mobile personal computer (UMPC), a cellular phone, a Personal Digital Assistant (PDA), an augmented reality (augmented reality, AR), a Virtual Reality (VR) device, etc., or a television, a large screen, a printer, a projector, etc. In some embodiments, wireless charging device 200 may be a cell phone wireless charger, an electric car charging peg, or the like.

For ease of understanding, the following embodiments will be described by taking the electronic device 100 as an example of a mobile phone.

Fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

As shown in fig. 2, the electronic device 100 may include a central processing module 10 (CPU, central processing unit/Processor), a wireless charge-receiving module 20, a battery 30, and the like, which may be coupled by various interconnection buses or other electrical connections. Illustratively, the wireless charge receiving module 20 is electrically connected with the central processing module 10 and the battery 30, respectively.

It should be noted that, a wireless charging transmitting module may be disposed in the wireless charging device 200, so as to transmit magnetic field energy to the wireless charging receiving module 20.

The central processing module 10 is one of the main devices of the personal computer, and is a core accessory in the personal computer. Its function is mainly to interpret computer instructions and process data in computer software. All operations in a personal computer are responsible for reading instructions, the core component of which decodes and executes the instructions. The program is a sequence of instructions, and the execution program executes instructions one by one according to the instruction sequence. Once the program is loaded into main memory, the tasks of reading instructions from main memory and executing instructions can be accomplished automatically by the CPU. Meanwhile, the function of one instruction is often realized by a component in a personal computer performing a series of operations. The CPU generates corresponding operation control signals according to the instruction functions and sends the corresponding operation control signals to corresponding components so as to control the components to act according to the instruction requirements.

Illustratively, the central processing module 10 may include arithmetic logic units, register units, operators, control units, and the like. 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 translations. Register unit, including general purpose registers, special purpose registers, and control registers. The control unit is mainly responsible for decoding the instructions and issuing control signals for each operation to be performed in order to complete each instruction.

The wireless charging receiving module 20 is a charging module arranged inside the electronic device 100, the wireless charging receiving module 20 is generally matched with a wireless charging transmitting module in the wireless charging device, and the wireless charging device is generally continuously connected with an external power supply and is used as an energy source for providing wireless charging for the electronic device 100. In order to reduce power consumption, the wireless charging receiving module 20 is generally not provided with a normal power supply, and cannot actively start the wireless charging process. The wireless charging transmitting module is generally connected with an external power supply, converts an external direct-current power supply into alternating-current voltage, converts the alternating-current voltage into magnetic field energy, and continuously radiates to an external space. When the wireless charging receiving module 20 approaches the wireless charging transmitting module to a certain extent, the wireless charging receiving module 20 is coupled to a certain magnetic field energy from space and sequentially converts into alternating voltage and direct voltage. When the direct current voltage is greater than a preset value, a control chip in the wireless charging receiving module 20 is started to establish wireless connection with the wireless charging transmitting module, so that wireless charging is performed on the wireless charging receiving module 20 through the wireless charging transmitting module.

For example, the wireless charging receiving module 20 may be a wireless charging receiving chip in a mobile phone having a wireless charging function or a wireless charging receiving chip in an electric vehicle having a wireless charging function.

The battery 30 is mainly used to store electric power and to supply electric power for the operation of the electronic device 100. For example, a battery in a personal mobile phone may be used to store the power obtained by the wireless charging receiving module 20, as well as to provide power for the use of the personal mobile phone.

It should be understood that the foregoing is merely an example of the structure of the electronic device 100, and the electronic device 100 may also include other subsystems or devices, and may be specifically configured and modified as needed, which is not limited in any way by the embodiment of the present application.

Fig. 3 is a schematic structural diagram of a wireless charging receiving module according to an embodiment of the application.

As shown in fig. 3, the wireless charging receiving module 20 may include a receiving resonant circuit 201, a rectifying bridge 202 and a controller 203, where the rectifying bridge 202 is electrically connected to the receiving resonant circuit 201 and the controller 203, respectively, the receiving resonant circuit 201 is used for converting magnetic field energy in a space into ac voltage, the rectifying bridge 202 is used for converting the ac voltage into dc voltage for the power supply device 100 to use and store in the battery 30, and the controller 203 is used for controlling the rectifying bridge 202 to work.

In the wireless charging process, the wireless charging receiving module 20 and the wireless charging transmitting module cooperate to perform wireless charging operation, and in a certain range, the wireless charging receiving module 20 receives magnetic field energy radiated by the wireless charging transmitting module. By way of example, a wireless charging transmission module may generally include a power full bridge electrically connected to a transmission resonant tank for converting a direct voltage of an external power source into an alternating voltage, and a transmission resonant tank for converting the alternating voltage into magnetic field energy and radiating it into space.

The wireless charging transmitting module is generally fixedly connected with an external power supply, the wireless charging receiving module 20 is generally arranged inside the intelligent mobile terminal, and when the wireless charging receiving module 20 inside the intelligent mobile terminal is not standard to place with the wireless charging transmitting module and is far away from the wireless charging transmitting module, the wireless charging receiving module 20 cannot receive the magnetic field energy of the wireless charging transmitting module, or the magnetic field energy of the wireless charging transmitting module is received to be small, so that the wireless charging connection between the wireless charging receiving module 20 and the wireless charging transmitting module cannot be established.

In view of this, the embodiment of the application provides a rectifying and boosting circuit, which increases the input voltage of the wireless charging receiving module 20, so as to enhance the coupling voltage of the wireless charging receiving module 20, so that the wireless charging of the device to be charged which is not normally placed can be realized, the degree of freedom of wireless charging of the user is effectively improved, and the wireless charging experience of the user is improved.

In the following, referring to fig. 4, a detailed description will be given of the problem that the wireless charging receiving module 20 and the wireless charging transmitting module are not placed in a standard manner, so that wireless charging cannot be established.

Fig. 4 is a schematic structural diagram of a wireless charging receiving module according to an embodiment of the present application.

As shown in fig. 4, in an embodiment of the present application, when wireless charging is required, it is generally required that the receiving coil center of the wireless charging receiving module 20 corresponds to the transmitting coil center of the wireless charging transmitting module, or the distance is within a certain range, so that the wireless charging receiving module 20 can receive the rectified output voltage greater than or equal to the starting ping process, and thus a wireless charging connection can be established between the wireless charging receiving module and the wireless charging transmitting module. When the receiving coil center of the wireless charging receiving module 20 is far from the transmitting coil center of the wireless charging transmitting module, the wireless charging receiving module 20 cannot be coupled to the magnetic field energy of the wireless charging transmitting module, so that a wireless charging connection cannot be established with the wireless charging transmitting module. For example, when the mobile phone is placed in a wireless charger without specification, 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 be connected with the wireless charger, and the wireless charger cannot realize wireless charging of the mobile phone.

Therefore, in order to solve the problem that the mobile phone and the wireless charger are not placed in a standard manner and wireless charging cannot be achieved in the embodiment of the application, the application provides a rectifying and boosting circuit, and the input voltage of a rectifying bridge module in the mobile phone is increased, so that the rectifying output voltage is enhanced, wireless charging can be achieved by placing the device to be charged in a non-standard manner, the degree of freedom of wireless charging of a user is effectively improved, and the wireless charging experience of the user is improved.

The following describes in detail the scheme of enhancing the rectified output voltage of the wireless charging receiving module with reference to fig. 5 to 12.

Fig. 5 is a schematic structural diagram of a rectifying and boosting circuit according to an embodiment of the present application.

As shown in fig. 5, an embodiment of the present application provides a rectifying and boosting circuit 50, which includes a rectifying bridge module 501 and a boosting module 502, and is applied between a resonance module 503 and a control chip 504 without a fixed power supply. The resonant module 503 is configured to convert magnetic field energy in an external space into an ac voltage, the rectifier bridge module 501 is electrically connected to the resonant module 503 and the control chip 504, respectively, and is configured to convert the external ac voltage into a dc voltage and obtain an output voltage, and 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 a wireless charging process with the wireless charging transmitting module.

The supercharging module 502 is electrically connected with the rectifier bridge module 501 and the control chip 504 respectively, and is used for being conducted when the output voltage is smaller than a preset value, the rectifier bridge module 501 works in a half-bridge mode to enable the resonance module 503 to store energy, so that the output voltage of the rectifier bridge module 501 is increased to enable the control chip 504 to be conveniently started, and the wireless charging receiving module 20 starts to conduct a wireless charging process with the wireless charging transmitting module. The boost module 502 is further configured to be turned off when the output voltage is greater than or equal to a preset value, so that the rectifying bridge module 501 operates in a full bridge mode to restore the rectifying efficiency.

In the embodiment of the present application, for example, in the wireless charging process, when a user places a mobile phone at a standard position of a wireless charger, an ac voltage that can be obtained by an input end of the rectifier bridge module 501 is higher, so that an output voltage rectified by the rectifier bridge module 501 is also higher, and when the output voltage is greater than or equal to a preset value, the control chip 504 is started through the output voltage, so that information interaction between the control chip 504 and the wireless charging transmitting module can be performed, and a wireless charging process is further realized.

When the position of the mobile phone placed on the wireless charger by the user is not standard, the ac voltage obtained by the input end of the rectifier bridge module 501 is lower, so that the output voltage rectified by the rectifier bridge module 501 is also lower, and when the output voltage is smaller than the preset value, the control chip 504 cannot be started. At this time, the boosting module 502 is turned on to make the rectifying bridge module 501 work in a half-bridge mode, so that the resonant module 503 starts to store energy according to the signal characteristic of the ac voltage, and the input voltage of the rectifying bridge module 501 is increased, so that the output voltage after rectification by the rectifying bridge module 501 is obtained after the increase, and when the output voltage after the increase is greater than or equal to a preset value, the control chip 504 is started by the output voltage after the increase, so that the control chip 504 can perform information interaction with the wireless charging transmitting module, and further a wireless charging process is realized.

The preset value may be, for example, a start-up voltage value of the control chip 504.

In another embodiment of the present application, after the control chip 504 is started according to the increased output voltage, that is, when the output voltage of the rectifying bridge module 501 is greater than or equal to the preset value, the pressurizing module 502 is disconnected, so that the rectifying bridge module 501 works in the full-bridge mode, thereby recovering the full-bridge rectifying efficiency of the rectifying bridge module 501. Therefore, when the position of the mobile phone placed on the wireless charger is not standard and the control chip 504 is not started, according to the rectifying and boosting circuit provided by the application, the output voltage of the rectifying bridge module 501 can be increased, so that the control chip 504 is more beneficial to starting, the wireless charging of the mobile phone placed in the non-standard state can be realized, the degree of freedom of the wireless charging of the user is effectively improved, and the wireless charging experience of the user is improved.

It should be noted that, before the wireless charging of the mobile phone is not started, the rectifying and boosting circuit of the present application is always in a default on state, that is, the boosting module 502 in the rectifying and boosting circuit is always in a default on state, so that the resonant module 503 is in a voltage-multiplying rectifying mode by default. When the mobile phone approaches to the wireless charger, the voltage doubling rectification mode obtained by the voltage boosting module 502 and the resonance module 503 effectively improves the output voltage rectified by the rectification bridge module 501, so that the control chip 504 is more favorably started, the control chip 504 starts a wireless charging program, and the mobile phone and the wireless charger are connected in a wireless charging mode.

Meanwhile, when the wireless charging connection is established between the mobile phone and the wireless charger, the pressurizing module 502 can be actively controlled to be disconnected, so that the resonance module 503 exits the voltage doubling rectifying mode, and the rectifying bridge module 501 enters the full-bridge rectifying mode, thereby effectively improving the rectifying efficiency of the rectifying bridge module 501 in the wireless charging process.

Fig. 6 is a circuit diagram of a rectifying and boosting circuit according to an embodiment of the present application.

As shown in fig. 6, in one embodiment provided by the present application, the resonance module 503 includes a first inductance L1 and a first capacitance 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.

In the embodiment of the application, the first inductor L1 and the first capacitor C1 form a resonant circuit for converting magnetic field energy in a space into an ac voltage. Illustratively, the first inductor L1 employs a wireless charging receiving coil in the wireless charging receiving module 20.

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 ac voltage with the higher frequency of the resonant module 503.

In another embodiment of the present application, the resonant module 503 may further include a second capacitor C2, where 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.

In the embodiment of the application, the second capacitor C2 is configured to cooperate with the first inductor L1 and the first capacitor C1 to form a resonant circuit, and is configured to filter an ac voltage obtained by the resonant circuit.

Meanwhile, it should be noted that, the second capacitor C2 is connected in parallel with the series circuit formed by the first inductor L1 and the first capacitor C1, so that the obtained parallel resonant frequency is far smaller than the operating frequency of the rectifier bridge module 501, and the ac voltage obtained by the resonant circuit is prevented from flowing through the second capacitor C2.

As shown in fig. 6, in one embodiment of the present application, the rectifier bridge module 501 includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, and a fourth MOS transistor Q4. The source electrode of the first MOS tube Q1 and the drain electrode of the fourth MOS tube Q4 are electrically connected with one end of the resonance module 503, the drain electrode of the first MOS tube Q1 and the drain electrode of the second MOS tube Q2 are electrically connected with one end of the pressurizing module 502, the source electrode of the second MOS tube Q2 and the drain electrode of the third MOS tube Q3 are electrically connected with the other end of the pressurizing module 502, and the source electrode of the third MOS tube Q3 and the source electrode of the fourth MOS tube Q4 are electrically connected.

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 form a rectifier bridge module 501, which is configured to perform full-bridge rectification on an input ac signal to obtain a rectified dc voltage for starting the control chip 504.

It should be noted that, in order to have a lower on-resistance, the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, and the fourth MOS transistor Q4 generally use enhancement type MOS transistors, for example, enhancement type NMOS transistors.

As shown in fig. 6, in one embodiment provided by the present application, the boosting module 502 includes a fifth MOS transistor Q5 and a voltage reduction device 5021; the source electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2 through the voltage reduction device 5021, the drain electrode of the fifth MOS tube Q5 is electrically connected with the source electrode of the second MOS tube Q2, and the grid electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2.

It should be noted that, the fifth MOS transistor Q5 is a P-channel depletion type MOS transistor, so when the gate-source voltage Vgs of the fifth MOS transistor Q5 is zero or negative, a channel between the gate and the drain already exists and is turned on. When the gate-source voltage Vgs of the fifth MOS transistor Q5 is greater than or equal to the gate-source turn-off voltage Vgs (off), the communication between the gate and the drain can be completely turned off. That is, when the mobile phone is not placed in the wireless charger or is not connected to the wireless charger, the fifth MOS transistor Q5 in the wireless charging receiving module 20 is in a conducting state, and when the mobile phone is placed in a certain range of the wireless charger and the output voltage of the rectifying bridge module 501 is greater than a preset value (i.e. the starting voltage of the control chip 504), the fifth MOS transistor is disconnected, so that the rectifying bridge module 501 recovers the full bridge rectifying efficiency.

In the embodiment of the present application, when the fifth MOS transistor Q5 is turned on, the output voltage Vrect of the rectifier bridge module 501 returns to the resonant module 503 via the fifth MOS transistor Q5 and the voltage reduction device 5021, so as to store energy for the resonant module 503 according to the positive and negative periods of the ac voltage, increase the input voltage of the rectifier bridge module 501, and further increase the output voltage Vrect of the rectifier bridge module 501, so as to start the control chip 504.

It should be noted that, the fifth MOS transistor Q5 may be controlled by the control chip 504, and when the output voltage Vrect of the rectifier bridge module 501 is smaller than a preset value, the fifth MOS transistor 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 transistor Q5 is turned off. Therefore, when the output voltage Vrect of the rectifier bridge module 501 does not reach the preset value, the resonant module 503 is made to be a voltage-doubler rectifier circuit, so that the output voltage Vrect of the rectifier bridge module 501 is increased. When the output voltage Vrect of the rectifier bridge module 501 reaches a preset value, the rectifier bridge module 501 can enter a full-bridge rectifier mode again, so that high-efficiency rectification is realized, and the transmission power of wireless charging is improved through larger current.

Fig. 7 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application.

As shown in fig. 7, in one embodiment provided by the present application, the output voltage of the first inductor L1 in the resonant module 503 is illustrativelyWhen the sine wave is a positive half cycle (i.e., the cycle of AC1-AC2 of the rectifier bridge module 501 is positive), the first inductance L1 is positive from top to 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 transistor Q1, and the boosting module 502 (i.e., the step-down device 5021 and the fifth MOS transistor Q5). At this time, the rectifier bridge module 501 is in a half-bridge rectifier mode, and the first inductor L1 charges the first capacitor C1, so that the first capacitor C1 obtains a first voltage drop U ₁.

It should be noted that, in an ideal situation, the first pressure drop U ₁ is similar to the original pressure drop U ₀.

Fig. 8 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application.

As shown in fig. 8, in one embodiment provided by the present application, the first inductance L1 is illustratively negative on top and positive off top when the sine wave is a negative half cycle (i.e., the cycle of AC1-AC2 of the rectifier bridge module 501 is negative). 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 transistor Q2 and the boosting module 502 (i.e., the fifth MOS transistor Q5 and the voltage reducing device 5021), the third capacitor C3, the fourth MOS transistor Q4 and the first capacitor C1. At this time, the rectifier bridge module 501 is in a half-bridge rectifier 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 voltages of the two ends of the first inductor L1 and the voltages of the two ends of the first capacitor C1, i.e., U ₁+U₀, that is, the voltage-doubler rectification of the rectifier bridge module 501 is implemented.

When the output voltage of the rectifier bridge module 501 is greater than or equal to a preset value, the control chip 504 is started. In response to the ping signal of the wireless charging transmitting module, the control chip 504 controls the gate-source voltage Vgs of the fifth MOS transistor Q5 to cut off the fifth MOS transistor, so that the rectifier bridge module 501 formed by the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q4 enters a full-bridge rectifier mode, and the resonant module 503 exits the voltage-multiplying rectifier mode, so that the wireless charging receiving module 20 enters a high-power wireless charging state.

It should be noted that the preset value may be a start-up voltage threshold of the control chip 504.

Fig. 9 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application.

As shown in fig. 9, in one embodiment provided by the present application, the rectifying and boosting circuit 50 illustratively includes a rectifying bridge module 501 and a boosting module 502. The boosting module 502 includes a fifth MOS transistor Q5 and a voltage step-down device 5021. The voltage dropping device 5021 may include a first resistor R1, where the first resistor R1 is connected between the source of the fifth MOS transistor Q1 and the drain of the second MOS transistor Q5. The source electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2 through the first resistor R1, the drain electrode of the fifth MOS tube Q5 is electrically connected with the source electrode of the second MOS tube Q2, and the grid electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2.

In the embodiment of the present application, after the fifth MOS transistor Q5 and the first resistor R1 are connected in series, they are connected in parallel with the second MOS transistor Q2, and when the user places the mobile phone in the wireless charger in an irregular manner, the output voltage of the rectifier bridge module 501 is smaller than the starting voltage of the control chip 504. At this time, since the fifth MOS transistor 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 resonant module 503 is a positive half period, the ac voltage flows from the positive electrode of the first inductor L1 through the first capacitor C1, the first MOS transistor Q1, the first resistor R1 and the fifth MOS transistor 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 U ₁.

When the ac voltage output by the first inductor L1 of the resonant module 503 is a negative half period, 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 are in the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltages of the two ends of the first inductor L1 and the voltage of the two ends of the first capacitor C1, i.e., U ₁+U₀, thereby implementing voltage doubling rectification of the rectifier bridge module 501, and making the output voltage of the rectifier bridge module 501 also be approximately increased by two times, which is further more beneficial to starting the control chip 504.

Further, after the control chip 504 in the mobile phone of the user is turned on and establishes wireless connection with the wireless charger, since the output voltage Vrect of the rectifying bridge module 501 is larger, the gate voltage of the fifth MOS transistor is increased, and the first resistor R1 will cause a voltage drop to the source voltage of the fifth MOS transistor, so that the gate-source voltage of the fifth MOS transistor is increased, and when the gate-source voltage Vgs of the fifth MOS transistor is greater than or equal to the gate-source off voltage Vgs (off), the fifth MOS transistor Q5 is automatically turned off, so that the fifth MOS transistor Q5 is turned on when the mobile phone is not in wireless charging connection with the wireless charger, the resonant module 503 forms a voltage doubling rectifying circuit, and the output voltage of the rectifying bridge module 501 is increased, so that the control chip 504 is started as much as possible. When the wireless charging connection between the mobile phone and the wireless charger is established, the mobile phone is disconnected, so that the resonance module 503 exits the voltage doubling rectification circuit, and the rectification bridge module 501 is restored to the full-bridge rectification mode, and the wireless charging process is performed by using the rectification voltage with higher power.

Compared with the traditional rectifier bridge module 501, the supercharging module 502 can start the control chip 504 inside the mobile phone when the mobile phone of the user and the wireless charger are placed in an irregular manner, so that the freedom degree of wireless charging of the mobile phone by the user is effectively improved, and the user experience degree is improved.

Fig. 10 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application.

As shown in fig. 10, in one embodiment provided by the present application, the rectifying and boosting circuit 50 illustratively includes a rectifying bridge module 501 and a boosting module 502. The boosting module 502 includes a fifth MOS transistor Q5 and a voltage step-down device 5021. The step-down device 5021 includes a first diode D1, where an anode of the first diode D1 is electrically connected to a drain of the second MOS transistor Q2, and a cathode of the first diode D1 is electrically connected to a source of the fifth MOS transistor Q5. The source electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2 through the first diode D1, the drain electrode of the fifth MOS tube Q5 is electrically connected with the source electrode of the second MOS tube Q2, and the grid electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2.

In the embodiment of the present application, after the fifth MOS transistor Q5 and the first diode D1 are connected in series, they are connected in parallel with the second MOS transistor Q2, and when the user places the mobile phone in the wireless charger in an irregular manner, the output voltage of the rectifier bridge module 501 is smaller than the starting voltage of the control chip 504. At this time, since the fifth MOS transistor 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 resonant module 503 is a positive half period, the ac voltage flows from the positive electrode of the first inductor L1 through the first capacitor C1, the first MOS transistor Q1, the first diode D1 and the fifth MOS transistor 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 U ₁.

When the ac voltage output by the first inductor L1 of the resonant module 503 is a negative half period, 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 are in the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltages of the two ends of the first inductor L1 and the voltage of the two ends of the first capacitor C1, i.e., U ₁+U₀, thereby implementing voltage doubling rectification of the rectifier bridge module 501, and making the output voltage of the rectifier bridge module 501 also be approximately increased by two times, which is further more beneficial to starting the control chip 504.

Further, after the control chip 504 in the mobile phone of the user is turned on and establishes wireless connection with the wireless charger, since the output voltage Vrect of the rectifying bridge module 501 is larger, the gate voltage of the fifth MOS transistor is increased, and the first diode D1 will cause a voltage drop to the source voltage of the fifth MOS transistor, so that the gate-source voltage of the fifth MOS transistor is increased, and when the gate-source voltage Vgs of the fifth MOS transistor is greater than or equal to the gate-source off voltage Vgs (off), the fifth MOS transistor Q5 is automatically turned off, so that the fifth MOS transistor Q5 is turned on when the mobile phone does not establish wireless charging connection with the wireless charger, the resonant module 503 forms a voltage doubling rectifying circuit, and the output voltage of the rectifying bridge module 501 is increased, so that the control chip 504 is started as much as possible. When the wireless charging connection between the mobile phone and the wireless charger is established, the mobile phone is disconnected, so that the resonance module 503 exits the voltage doubling rectification circuit, and the rectification bridge module 501 is restored to the full-bridge rectification mode, and the wireless charging process is performed by using the rectification voltage with higher power.

Fig. 11 is a circuit diagram of a rectifying and boosting circuit according to another embodiment of the present application.

As shown in fig. 11, in one embodiment provided by the present application, the rectifying and boosting circuit 50 includes a rectifying bridge module 501 and a boosting module 502. The boosting module 502 includes a fifth MOS transistor Q5 and a voltage step-down device 5021. The supercharging module 502 comprises a fifth MOS tube Q5 and a voltage measurement and control chip U2; the source electrode of the fifth MOS tube Q5 is electrically connected with the drain electrode of the second MOS tube Q2, the drain electrode of the fifth MOS tube Q5 is electrically connected with the source electrode of the second MOS tube Q2, and the voltage measurement and control chip U2 is electrically connected with the grid electrode of the fifth MOS tube Q5 and the source electrode of the fifth MOS tube Q5 respectively.

In the embodiment of the present application, when the user places the mobile phone in the wireless charger without specification, the output voltage of the rectifier bridge module 501 is smaller than the starting voltage of the control chip 504. At this time, since the fifth MOS transistor 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 resonant module 503 is a positive half period, the ac voltage flows from the positive electrode of the first inductor L1 through the first capacitor C1, the first MOS transistor Q1 and the fifth MOS transistor 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 U ₁.

When the ac voltage output by the first inductor L1 of the resonant module 503 is a 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 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 are in the same direction, so that the input voltage of the rectifier bridge module 501 is the sum of the voltages of the two ends of the first inductor L1 and the voltage of the two ends of the first capacitor C1, i.e., U ₁+U₀, thereby implementing voltage doubling rectification of the rectifier bridge module 501, and making the output voltage of the rectifier bridge module 501 also be approximately increased by two times, which is further more beneficial to starting the control chip 504.

Further, after the control chip 504 in the mobile phone of the user is turned on and establishes wireless connection 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 transistor Q5 to be turned off, so that the fifth MOS transistor Q5 is turned on when the mobile phone does not establish wireless charging connection with the wireless charger, the resonant module 503 forms a voltage doubling rectifier circuit, the output voltage of the rectifier bridge module 501 is increased, and the control chip 504 is started as much as possible. When the wireless charging connection between the mobile phone and the wireless charger is established, the mobile phone is disconnected, so that the resonance module 503 exits the voltage doubling rectification circuit, and the rectification bridge module 501 is restored to the full-bridge rectification mode, and the wireless charging process is performed by using the rectification voltage with higher power. Compared with the traditional rectifier bridge module 501, the supercharging module 502 can start the control chip 504 inside the mobile phone when the mobile phone of the user and the wireless charger are placed in an irregular manner, so that the freedom degree of wireless charging of the mobile phone by the user is effectively improved, and the user experience degree is improved.

Fig. 12 is a waveform diagram of a rectifying and boosting circuit according to an embodiment of the present application.

As shown in fig. 12, when the wireless charging receiving module 20 does not adopt the rectifying and boosting circuit provided by the embodiment of the present application, the maximum value of the original voltage output after rectification by the rectifying bridge module 501 is about 7V. When the wireless charging receiving module 20 adopts the rectifying and boosting circuit (q5+d1 scheme) provided by an embodiment of the present application, the maximum value of the output voltage after rectification by the rectifying bridge module 501 is about 9V. When the wireless charging receiving module 20 adopts the rectifying and boosting circuit (q5+r1 scheme) provided by another embodiment of the present application, the maximum value of the output voltage after rectification by the rectifying bridge module 501 is about 9V. When the wireless charging receiving module 20 adopts the rectifying and boosting circuit (q5+u2 scheme) provided by another embodiment of the present application, the maximum value of the output voltage after rectification by the rectifying bridge module 501 is about 9V. Therefore, as can be seen from the waveform chart, the output voltage rectified by the rectifier bridge module 501 can be obviously improved by adopting the rectifier boosting circuit.

In addition, the rectifying and boosting circuit can be obtained through multiple experimental tests, when the mobile phone is placed in the wireless charger in an irregular manner to try to perform wireless charging, the offset angle of the wireless charging receiving coil of the mobile phone relative to the wireless charging transmitting coil of the wireless charger can be effectively increased, so that the degree of freedom of wireless charging of the mobile phone is effectively improved, and the user experience degree is improved.

As shown in fig. 13, an embodiment of the present application provides a wireless charging receiving module 20, which includes a resonance module 503, a control chip 504 without a fixed power supply, and a rectifying and boosting circuit 50; the rectifying and boosting 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 the space into an ac voltage; the rectifying and boosting circuit 50 is configured to convert the ac voltage into a dc voltage, and increase the dc voltage when the dc voltage is less than a preset value, and the control chip 504 is configured to control a wireless charging process of the wireless charging receiving terminal.

In the embodiment of the present application, when a user places a mobile phone on a wireless charger, the resonance module 503 converts magnetic field energy generated by the wireless charger in space into ac voltage, the rectification boost circuit 50 is turned on by default, so that the resonance module 503 enters a voltage-multiplying rectification state, and the rectification bridge module 501 rectifies in a half-bridge mode, thereby converting the ac voltage into dc voltage and increasing the dc voltage, so as to enable the control chip 504 to be started. After the control chip 504 is started, the rectifying and boosting circuit 50 is disconnected, so that the rectifying bridge module 501 rectifies in a full-bridge mode, and higher rectifying efficiency is recovered, and therefore, the wireless charging of the device to be charged which is not standardized can be realized, the degree of freedom of wireless charging of a user is greatly improved, and the wireless charging experience of the user is improved.

Further, the wireless charging receiving module 20 further includes a low dropout regulator (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, and the other end of the fourth capacitor C4 and the other end of the load are electrically connected to the other end of the rectifier bridge module 501.

In the embodiment of the present application, the low dropout regulator is configured to stabilize the output voltage of the rectifying and boosting circuit 50, and the fourth capacitor C4 is configured to filter the output voltage of the rectifying and boosting circuit 50. The load may be a battery or a power consuming device for storing or receiving the output voltage of the rectified boost circuit 50.

The embodiment of the application also provides a wireless charging chip, which comprises the wireless charging receiving module 20, wherein the wireless charging receiving module 20 comprises the rectifying and boosting circuit 50, and when the placement position of the equipment to be charged in the wireless charger is not standard, the input voltage of the rectifying bridge module can be increased through the boosting module, so that the rectifying output voltage is enhanced, the equipment to be charged which is not standard can also realize wireless charging, the degree of freedom of wireless charging of a user is effectively improved, and the wireless charging experience of the user is improved.

The embodiment of the application also provides electronic equipment, which comprises the wireless charging receiving module 20, wherein the wireless charging receiving module 20 comprises the rectifying and boosting circuit 50, and when the placement position of the equipment to be charged in the wireless charger is not standard, the input voltage of the rectifying bridge module can be increased through the boosting module, so that the rectifying output voltage is enhanced, the equipment to be charged which is not standard can also realize wireless charging, the degree of freedom of wireless charging of a user is effectively improved, and the wireless charging experience of the user is improved.

The beneficial effects achieved by the electronic device provided by the embodiment of the present application can refer to the beneficial effects corresponding to the modules provided above, and are not described herein.

It should be understood that the above description is only intended to assist those skilled in the art in better understanding the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. It will be apparent to those skilled in the art from the foregoing examples that various equivalent modifications or variations can be made, for example, certain steps may not be necessary in the various embodiments of the detection methods described above, or certain steps may be newly added, etc. Or a combination of any two or more of the above. Such modifications, variations, or combinations are also within the scope of embodiments of the present application. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of 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.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

It should also be understood that the foregoing description of embodiments of the present application focuses on highlighting differences between the various embodiments and that the same or similar elements not mentioned may be referred to each other and are not repeated herein for brevity.

It should also be understood that, in various embodiments of the present application, the sequence number of each process does not mean that the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

It should be further understood that, in the embodiments of the present application, the "preset" and "predefined" may be implemented by pre-storing corresponding codes, tables, or other manners that may be used to indicate relevant information in a device (including, for example, an electronic device), and the present application is not limited to the specific implementation manner thereof.

It should also be understood that the manner, the case, the category, and the division of the embodiments in the embodiments of the present application are merely for convenience of description, should not be construed as a particular limitation, and the features in the various manners, the categories, the cases, and the embodiments may be combined without contradiction.

It is also to be understood that in the various embodiments of the application, where no special description or logic conflict exists, the terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments in accordance with their inherent logic relationships.

Finally, it should be noted that: the foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application should be defined by the claims, and the above description is only a preferred embodiment of the technical solution of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The rectification boosting circuit is applied to a resonance module and a control chip without a fixed power supply and is characterized by comprising a rectification bridge module and a boosting module;

the rectifier bridge module is respectively and electrically connected with the resonance module and the control chip and is configured to convert external alternating voltage into direct voltage and obtain output voltage, and the control chip is started when the output voltage is greater than or equal to a preset value;

The supercharging module is respectively and electrically connected with the rectifier bridge module and the control chip and is configured to be conducted when the output voltage is smaller 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 and enable the control chip to be started conveniently.

2. The rectifying and boost circuit of claim 1, wherein said boost module is further configured to turn off when said output voltage is greater than or equal to said preset value, such that said rectifying bridge module operates in full bridge mode to restore rectifying efficiency.

3. The rectifying and boosting circuit according to claim 1, wherein the rectifying bridge module comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor;

The source electrode of the first MOS tube and the drain electrode of the fourth MOS tube are electrically connected with one end of the resonance module, the drain electrode of the first MOS tube and the drain electrode of the second MOS tube are electrically connected with one end of the pressurizing module, the source electrode of the second MOS tube and the drain electrode of the third MOS tube are electrically connected with the other end of the pressurizing module, and the source electrode of the third MOS tube and the source electrode of the fourth MOS tube are electrically connected.

4. The rectifying and boosting circuit according to claim 3, wherein said boosting module comprises a fifth MOS transistor and a voltage reduction device;

the source electrode of the fifth MOS tube is electrically connected with the drain electrode of the second MOS tube through the voltage reduction device, the drain electrode of the fifth MOS tube is electrically connected with the source electrode of the second MOS tube, and the grid electrode of the fifth MOS tube is electrically connected with the drain electrode of the second MOS tube.

5. The rectifying and boosting circuit according to claim 4, wherein said voltage step-down device includes a first resistor; the first resistor is connected between the source electrode of the fifth MOS tube and the drain electrode of the second MOS tube.

6. The rectifying and boosting circuit according to claim 4, wherein said step-down device includes a first diode; the positive electrode of the first diode is electrically connected with the drain electrode of the second MOS tube, and the negative electrode of the first diode is electrically connected with the source electrode of the fifth MOS tube.

7. The rectifying and boosting circuit according to claim 3, wherein said boosting module comprises a fifth MOS transistor and a voltage measurement and control chip;

The source electrode of the fifth MOS tube is electrically connected with the drain electrode of the second MOS tube, the drain electrode of the fifth MOS tube is electrically connected with the source electrode of the second MOS tube, and the voltage measurement and control chip is respectively and electrically connected with the grid electrode of the fifth MOS tube and the source electrode of the fifth MOS tube.

8. The rectifying and boosting circuit according to any one of claims 4 to 7, wherein said fifth MOS transistor comprises a P-channel depletion MOS transistor.

9. The rectifying and boosting circuit according to any one of claims 1 to 7, wherein said resonance module includes a first inductance and a first capacitance;

One end of the first inductor is electrically connected with 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 with the rectifier bridge module.

10. A wireless charging receiving module, comprising a resonance module, a control chip without a fixed power supply, and the rectifying and boosting circuit of any one of claims 1 to 9; the rectification boosting circuit is respectively and electrically connected with the resonance module and the control chip;

the resonance module is configured to convert electromagnetic energy in a space into alternating voltage;

the control chip is configured to control a wireless charging process of the wireless charging receiving end.

11. The wireless charging receiving chip is characterized by comprising the wireless charging receiving module 10.

12. An electronic device comprising the wireless charging receiving chip of claim 11.