Boost control circuit, wireless charging control system and wireless charging device

Abstract

The invention discloses a boost control circuit, a wireless charging control system and a wireless charging device. The boost control circuit is characterized in that a grid electrode of an MOS transistor Q2 is used for receiving a first enable signal; the source is connected with working voltage; the drain electrode is connected with the voltage input end of the boost unit and is connected with the collector electrode of the triode Q1. The base electrode of the triode Q1 is used for receiving a second enable signal; the collector is connected with the enabling control end of the boosting unit; the emitter is grounded; when the first enable signal is at a low level, the MOS tube Q2 is conducted, the voltage input end is connected with a working voltage, and the boost unit enters a wake-up state; when the first enable signal is at a low level and the second enable signal is at a high level, the triode Q1 is conducted, and the enable control end is grounded; the boost unit enters a dormant state from a wake-up state. The awakening mode and the sleep mode are automatically switched according to the charging state of the battery of the to-be-charged device, and the method is suitable for wireless charging of the portable device in a scene without an external power supply.

Description

Technical Field

[0001] The present application relates to the technical field of self-powered wireless charging, and in particular to a boost control circuit, a wireless charging control system, and a wireless charging device. Background Art

[0002] Wireless charging technology enables wireless power transmission through electromagnetic induction, magnetic resonance, or radio frequency (RF) radiation, enabling the powering of electronic devices without requiring a physical connection. It is widely used in electronic products such as smartphones, smartwatches, and wireless headphones.

[0003] However, with technological advancements, existing wireless charging devices have gradually exposed the following technical flaws: Traditional wireless charging devices remain operational even after the device being charged is fully charged. During the charging process, they are unable to dynamically adjust their power consumption strategy based on real-time current changes, resulting in energy waste. Furthermore, traditional wireless charging devices rely on external power supplies and cannot be used without a fixed power source, limiting their application in mobile scenarios. Furthermore, they lack intelligent sleep and wakeup mechanisms, requiring manual operation to switch between sleep and wakeup modes. Traditional wireless charging devices also commonly use microcontroller units (MCUs) as controllers, which are relatively expensive. Taken together, these flaws constitute a multi-dimensional bottleneck that restricts the development of wireless charging technology. Summary of the Invention

[0004] To solve the above technical problems, the present application discloses a boost control circuit, a wireless charging control system, and a wireless charging device that automatically switches between wake-up and sleep modes according to the battery charging status of the device to be charged, and is suitable for wireless charging of portable devices in scenarios without an external power supply. Specifically, the technical solution of the present application is as follows:

[0005] In a first aspect, the present application discloses a boost control circuit for controlling the working state of a boost unit;

[0006] The gate of the MOS transistor Q2 is a first signal input terminal for receiving a first enable signal; the source is connected to the operating voltage; the drain is connected to the voltage input terminal of the boost unit and is also connected to the collector of the transistor Q1;

[0007] The base of the transistor Q1 is a second signal input terminal for receiving a second enable signal; the collector is connected to the enable control terminal of the boost unit; and the emitter is grounded;

[0008] When the first enable signal is at a low level, the MOS tube Q2 is turned on, the voltage input terminal is connected to the working voltage, and the boost unit enters the awake state;

[0009] When the first enable signal is at a low level and the second enable signal is at a high level, the transistor Q1 is turned on, the enable control terminal is grounded, and the boost unit enters a dormant state from the awake state.

[0010] In some embodiments, when the first enable signal is at a high level, the MOS transistor Q2 is turned off; no voltage is input to the voltage input terminal, and the boost unit remains in a dormant state.

[0011] In some embodiments, the boost control circuit further includes a first resistor, a second resistor, and a third resistor;

[0012] One end of the first resistor is connected to the drain of the MOS transistor Q2; the other end is connected to the collector of the transistor Q1;

[0013] One end of the second resistor is connected to the gate of the MOS transistor Q2, and the other end is connected to the source of the MOS transistor Q2;

[0014] One end of the third resistor is connected to the signal source of the second enable signal, and the other end is connected to the base of the transistor Q1.

[0015] In a second aspect, the present application further discloses a wireless charging control system, comprising: a battery, a device detection unit, a boost control unit, a boost unit, a voltage comparison unit, and a D flip-flop;

[0016] Wherein, the boost control unit includes the boost control circuit as described in any one of the above embodiments;

[0017] The battery is used as a mobile power source to provide operating voltage;

[0018] The device detection unit is connected to the boost control unit, and is used to detect whether there is a device to be charged, and output the first enable signal to the boost control unit; the first enable signal is used to control the MOS transistor Q2 to be turned on or off;

[0019] The boost unit generates a driving voltage in the awake state, and the driving voltage is used to drive the wireless transmitting module to generate a sinusoidal signal to wirelessly charge the device to be charged;

[0020] The voltage comparison unit is used to compare the reference voltage with the voltage sampled and amplified by the wireless transmitting unit;

[0021] The D trigger is connected to the voltage comparison unit and the boost control unit, and is used to output the second enable signal to the boost control unit based on the comparison result of the voltage comparison unit; the second enable signal is used to control the transistor Q1 to be turned on or off.

[0022] In some embodiments, when the device detection unit detects the presence of a device to be charged, the device detection unit generates the first enable signal as a low level; the boost control unit receives the first enable signal and controls the boost unit to enter a wake-up state;

[0023] When the device detection unit detects that there is no device to be charged, the device detection unit generates the first enable signal as a high level; the boost control unit receives the first enable signal and controls the boost unit to maintain a dormant state.

[0024] In some embodiments, the wireless charging control system further includes:

[0025] A wireless transmitting unit connected to the boost unit; including the wireless transmitting module; configured to generate a sinusoidal signal of a specified frequency and transmit it to the device to be charged when the boost unit is in an awake state;

[0026] a current detection unit connected to the wireless transmitting unit and the voltage comparison unit; configured to convert the current generated by the wireless transmitting unit into a voltage through a sampling resistor, and amplify the voltage and transmit it to the reverse end of the voltage comparison unit;

[0027] A reference voltage unit is connected to the voltage comparison unit and includes a reference voltage chip; and is used to generate the reference voltage and transmit the reference voltage to the same-direction end of the voltage comparison unit.

[0028] In some embodiments, when the voltage after sampling and amplification by the wireless transmitting unit is less than the reference voltage, the voltage comparison unit outputs a high level; the D trigger generates the second enable signal as a high level; the boost control unit receives the second enable signal and controls the boost unit to enter a sleep state from the wake-up state.

[0029] When the voltage after sampling and amplification by the wireless transmitting unit is not less than the reference voltage, the voltage comparison unit outputs a low level; the D trigger generates the second enable signal as a low level; the boost control unit receives the second enable signal and controls the boost unit to maintain the awake state.

[0030] In some embodiments, the wireless charging control system further includes:

[0031] a charging management unit connected between the battery and a fixed power source, and configured to manage the charging process of the battery;

[0032] An LED display unit, connected to the battery, for monitoring the battery voltage based on a voltage monitoring chip and displaying the remaining power through LED lamp beads;

[0033] The charging management unit is further configured to interrupt current transmission between the battery and the fixed power source after the battery is fully charged.

[0034] In some embodiments, the wireless charging control system further includes:

[0035] The anti-shake unit is connected to the voltage comparison unit and the D trigger; it includes an RC delay circuit; and is used to delay and filter the output signal of the voltage comparison unit.

[0036] In a third aspect, the present application further discloses a wireless charging device, which includes a wireless charging control system as described in any one of the above embodiments.

[0037] Compared with the prior art, this application has at least one of the following beneficial effects:

[0038] 1. The boost control circuit of this application is based on a state machine design. By switching digital logic according to a preset current threshold, wake-up and sleep modes are implemented, thereby achieving low power consumption. Through this application, the boost voltage wake-up and sleep modes can be automatically switched according to the placement and removal of the device to be charged, as well as the charging status of the host battery, enabling the wireless charging device to be autonomously turned on and off. The user can complete the entire charging process without any manual switching operation. This achieves non-sensing operation and optimizes the user experience.

[0039] 2. In terms of power supply, the wireless charging device of this application adopts a built-in power supply design, which gets rid of the dependence on a fixed external power supply, thereby improving the convenience of mobile use and expanding the flexibility of application scenarios.

[0040] 3. In terms of energy efficiency, by optimizing electromagnetic conversion efficiency and introducing an intelligent sleep mechanism, standby power consumption can be reduced compared to traditional solutions, thereby extending device life while saving energy and protecting the environment.

[0041] 4. Adopting an innovative MCU-free control architecture, power regulation and state switching are directly implemented through hardware circuits, which not only simplifies the system complexity but also keeps the overall cost within an acceptable range, creating favorable conditions for large-scale popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0043] Figure 1This is a circuit structure diagram of an embodiment of a boost control circuit of the present application;

[0044] Figure 2 This is a structural diagram of an embodiment of a wireless charging control system of the present application;

[0045] Figure 3 This is a flow chart of the wireless charging control logic in an embodiment of the present application.

[0046] Description of Figure Numbers:

[0047] Q1-transistor; Q2-MOS tube; R1-first resistor; R2-second resistor; R3-third resistor; VIN-voltage input terminal; EN-enable control terminal; VOUT-voltage output terminal; 1-device detection unit; 2-LED display unit; 3-charging management unit; 4-boost control unit; 5-battery; 6-wireless transmission unit; 7-current detection unit; 8-voltage comparison unit; 9-anti-shake unit; 10-D trigger; 11-boost unit; 12-reference voltage unit. DETAILED DESCRIPTION

[0048] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0049] It will be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0050] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0051] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0052] It should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0053] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0055] Wireless charging technology, also known as contactless charging or inductive charging, is based on electromagnetic induction, magnetic resonance, or radio frequency energy transmission. It is a technology that enables the transmission of electrical energy from a power supply device (transmitter) to a powered device (receiver) without physical contact. Wireless charging devices, such as wireless charging docks, are removable charging bases with integrated wireless charging capabilities. They provide a convenient charging experience for devices that support wireless charging standards such as electromagnetic induction, such as smartphones, headphones, and smartwatches. Wireless charging devices generate an electromagnetic field through a built-in transmitting coil, allowing devices placed in the charging area to recharge electronic devices without the need for traditional charging cables.

[0056] In actual applications, traditional wireless charging technology has gradually exposed the following technical defects, which not only reduce energy utilization efficiency but also limit the flexibility of usage scenarios. First, the most prominent problem is the phenomenon of energy waste. When the battery of the receiving device, such as a smartphone, is fully charged, most traditional wireless chargers continue to remain in operation, maintaining the emission of the electromagnetic field. This continuous standby mode leads to unnecessary no-load losses, which will result in considerable energy waste over time. Second, the limitations of the power supply method seriously restrict the usage scenarios. Existing wireless charging devices must be connected to a fixed power outlet to work. This rigid power supply requirement makes them completely unsuitable for outdoor mobile scenarios. Traditional wireless charging solutions are basically ineffective when users are in a car, traveling, or in emergency charging scenarios. This limitation directly undermines the convenience advantage that wireless charging technology should have.

[0057] When it comes to energy efficiency management, traditional devices generally lack dynamic adjustment capabilities. Their operating power is typically set during the initialization phase and remains fixed, unable to dynamically adjust to the changing current demands during the charging process. For example, when the battery enters the trickle charging phase, the system maintains full electromagnetic field output. This power output mode is detrimental to battery health and can arbitrarily shorten battery life. Furthermore, a lack of intelligence is a significant shortcoming. Mainstream products lack intelligent sleep and wake-up mechanisms based on load detection, requiring users to manually plug and unplug the power supply to completely disconnect the power supply. This design not only increases usage complexity and impacts the user experience, but can also cause the device to remain in standby mode for extended periods due to human negligence, resulting in continuous power leakage.

[0058] Finally, hardware architecture limitations drive up costs. Existing solutions generally use a microcontroller unit (MCU) as the core controller, requiring the development of supporting peripheral circuits and specialized firmware. This architecture not only increases costs but also prolongs R&D cycles, significantly hindering technology adoption.

[0059] In view of the above, in order to break through these limitations, the present application discloses a boost control circuit, a wireless charging control system and a wireless charging device, which can automatically switch between wake-up and sleep modes according to the battery charging status of the device to be charged, and is suitable for wireless charging of portable devices in scenarios without external power supply.

[0060] The following is an explanation with reference to the accompanying drawings:

[0061] Figure 1 This is a schematic diagram of the circuit structure of the boost control circuit of this application. Figure 1 As shown, the present application discloses an embodiment of a boost control circuit. In this embodiment, the boost control circuit is used to control the operating state of the boost unit. The boost unit, as a key module of the wireless charging device, plays the role of increasing the input voltage to meet the efficiency and power requirements of wireless energy transmission. The boost control circuit controls the operating state of the boost unit, that is, indirectly controls the opening and closing of the wireless charging device.

[0062] refer to Figure 1 The main components of the boost control circuit include: transistor Q1 and MOS tube Q2.

[0063] The gate (Gate, G) of MOS transistor Q2 is the first signal input terminal, connected to the device detection unit, for receiving the first enable signal. The source (Source, S) is connected to the operating voltage. The drain (Drain, D) is connected to the voltage input terminal VIN of the boost unit and is also connected to the collector of transistor Q1. The base (Base, B) of transistor Q1 is the second signal input terminal, connected to the D flip-flop, for receiving the second enable signal. The collector (C) is connected to the enable control terminal EN of the boost unit. The emitter (Emitter, E) is grounded.

[0064] When the first enable signal is low, MOS transistor Q2 is turned on, the voltage input terminal VIN is connected to the operating voltage, and the boost unit enters the awake state. When the first enable signal is low and the second enable signal is high, transistor Q1 is turned on, the enable control terminal EN is grounded, and the boost unit enters the dormant state from the awake state.

[0065] In this embodiment, the boost control circuit is the main circuit of the boost control unit, wherein the transistor Q1 is an NPN transistor and the MOS transistor Q2 is a PMOS transistor, and the following embodiments will use Q1 and Q2 to replace them respectively.

[0066] In some embodiments, the first enable signal is input by the device detection unit to indicate whether there is a device to be charged on the device. The second enable signal is input by the D trigger to indicate the charging status of the device to be charged.

[0067] In other embodiments, when the first enable signal is at a high level, the MOS transistor Q2 is turned off; no voltage is input to the voltage input terminal VIN, and the boost unit remains in a dormant state.

[0068] Based on the above embodiment, the present application discloses another embodiment of a boost control circuit, which further includes a first resistor R1, a second resistor R2, and a third resistor R3.

[0069] One end of the first resistor R1 is connected to the drain of the MOS transistor Q2; the other end is connected to the collector of the transistor Q1; one end of the second resistor R2 is connected to the gate of the MOS transistor Q2, and the other end is connected to the source of the MOS transistor Q2; one end of the third resistor R3 is connected to the signal source of the second enable signal, and the other end is connected to the base of the transistor Q1. Figure 1 shown.

[0070] The first resistor R1 limits the current flowing through the MOS transistor Q2 and the transistor Q1, preventing overcurrent damage to the devices. For the transistor Q1, the first resistor R1 acts as a collector load resistor; for the MOS transistor Q2, the first resistor R1 can also be used to adjust the drain load characteristics. The second resistor R2 is connected between the gate and source of the MOS transistor Q2, accelerating the discharge of gate charge, preventing static electricity accumulation in the MOS transistor, and improving circuit stability. The third resistor R3 is connected to the base of the transistor Q1 to prevent excessive drive current from flowing in, avoiding damage to the transistor or signal source, and ensuring that the circuit operates within a safe range.

[0071] In some other implementations of this embodiment, a parasitic diode is further provided between the source and drain of the MOS transistor Q2, with the parasitic diode pointing from the source to the drain. The parasitic diode provides a reverse current path. When the MOS transistor Q2 is turned off, the parasitic diode provides a path for the freewheeling current of the inductive load, preventing high-voltage breakdown. Furthermore, the parasitic diode can be briefly turned on to discharge electrostatic pulses and protect the gate of the MOS transistor Q2.

[0072] Based on the same concept, this application also discloses a wireless charging control system. Figure 2 , Figure 2 The wireless charging control system in the embodiment of the present application is shown in the figure. The wireless charging control system includes: a battery 5, a device detection unit 1, a boost control unit 4, a boost unit 11, a voltage comparison unit 8 and a D flip-flop 10;

[0073] The boost control unit includes the boost control circuit in any of the above embodiments.

[0074] Battery 5 serves as the core power source for the device, providing operating voltage. For example, a lithium battery can be connected to an external power source to store electrical energy. After being fully charged, battery 5 can also serve as a mobile power source to power other power-consuming units in the device, such as the device detection unit 1, the boost control unit 4, the voltage comparison unit 8, and the D-type flip-flop 10.

[0075] Device detection unit 1 is connected to the boost control unit and is used to detect the presence of a device to be charged. It then outputs a first enable signal to boost control unit 4; this first enable signal is used to control the conduction or cutoff of MOS transistor Q2. When in the awake state, boost unit 11 generates a drive voltage that drives the wireless transmitter module to generate a sinusoidal signal for wireless charging of the device to be charged.

[0076] Voltage comparison unit 8 is used to compare the reference voltage with the voltage sampled and amplified by the wireless transmission unit. A D-type flip-flop 10 is connected to voltage comparison unit 8 and boost control unit 4 and is used to output a second enable signal to boost control unit 4 based on the comparison result of voltage comparison unit 8. This second enable signal is used to control transistor Q1 to be turned on or off.

[0077] In this embodiment, the device detection unit 1 detects whether a device to be charged exists, that is, determines whether a device to be charged is placed on the charging platform of the wireless charging device. The wireless charging device is a specific application carrier of the wireless charging control system of this application, such as a wireless charging dock. The device to be charged is a device that supports wireless charging standards such as electromagnetic induction, such as mobile phones, watches, headphones, tablets, laptops, etc. The type of device to be charged is not specifically limited in this application.

[0078] Optionally, the device detection unit 1 uses a variety of sensing technologies to determine whether a device to be charged is placed on the charging platform of the wireless charging device. For example, when the device is close to the charging area, the detection unit will sense the presence of a metal object or a receiving coil by emitting a low-power detection signal or monitoring changes in the electrical parameters of the coil. Alternatively, the device detection unit 1 can also assist in detecting physical contact or magnetic alignment by combining a pressure sensor, an infrared proximity sensor, a Hall effect sensor, etc. Once a device to be charged that meets the wireless charging standard is detected, the device detection unit 1 controls the first enable signal to switch from a high level to a low level. The boost control unit 4 receives the first enable signal and controls the boost unit to enter a wake-up state. If no valid device is detected or a foreign object, such as a metal key, is found, the first enable signal remains at a high level. The boost control unit 4 receives the first enable signal and controls the boost unit to remain in a dormant state. Avoid energy waste or safety hazards.

[0079] In other embodiments, the core function of the voltage comparison unit 8 in a wireless charging device is to determine whether the current energy transfer status meets preset requirements by comparing a reference voltage with the actual voltage of the wireless charging coil in real time. When the voltage sampled and amplified by the wireless transmitting unit is lower than the reference value, it indicates that the charging power of the load to be charged is low and may be fully charged or in a trickle charging state. Conversely, when the voltage sampled and amplified by the wireless transmitting unit is higher than or equal to the reference value, it indicates that the device is charging at a higher power. The voltage comparison unit outputs high and low level signals to represent this comparison result, providing key criteria for subsequent control. The D-type flip-flop 10, acting as a digital logic interface, synchronously latches the transient signal output by the voltage comparison unit 8. When the voltage comparison result meets the conditions, such as when the voltage sampled and amplified by the wireless transmitting unit is lower than the reference voltage, the D-type flip-flop, synchronized with the clock signal, outputs a specific enable signal to the boost control unit 4, triggering the boost circuit 11 to adjust the output voltage, thereby dynamically optimizing the wireless charging power.

[0080] Optionally, the value of the reference voltage is established based on different voltage standards, which is not specifically limited in this application.

[0081] The present application discloses another embodiment of a wireless charging control system. Based on the above embodiment, the wireless charging control system further includes: a wireless transmitting unit 6 , a current detection unit 7 and a reference voltage unit 12 .

[0082] The wireless transmitting unit 6 is connected to the boost unit 11. At the same time, the wireless transmitting unit 6 is line-surface coupled with the device to be charged. The wireless transmitting unit 6 includes a wireless transmitting module, which is used to generate a sinusoidal signal of a specified frequency and transmit it to the device to be charged when the boost unit is in the awake state. The current detection unit 7 is connected to the wireless transmitting unit 6 and the voltage comparison unit 8; it is used to convert the current generated by the wireless transmitting unit into a voltage through a sampling resistor, and amplify the voltage and transmit it to the reverse end of the voltage comparison unit 8. The reference voltage unit 12 is connected to the voltage comparison unit 8, which includes a reference voltage chip; it is used to generate a reference voltage and transmit the reference voltage to the same direction end of the voltage comparison unit 8.

[0083] When the voltage after sampling and amplification of the wireless transmitting unit is less than the reference voltage, the voltage comparison unit 8 outputs a high level; the D trigger 10 generates a second enable signal as a high level; the boost control unit 4 receives the second enable signal and controls the boost unit 11 to enter the sleep state from the wake-up state.

[0084] When the voltage comparison unit 8 compares the voltage sampled and amplified by the wireless transmitting unit and is not less than the reference voltage, it outputs a low level; the D flip-flop 10 generates a second enable signal as a low level; the boost control unit 4 receives the second enable signal and controls the boost unit 11 to remain awake.

[0085] This embodiment combines Figure 1 、 Figure 2 To illustrate, the control logic of the boost control unit 4 is as follows:

[0086] When the device to be charged is not inserted, the device detection unit 1 outputs a logic high level, Q2 is turned off, and no voltage is input to the voltage input terminal VIN (Voltage Input) of the boost unit 11. The system does not work, that is, enters sleep mode.

[0087] When the device to be charged is placed in, that is, the device detection unit 1 outputs a logic low level, Q2 is turned on, and the voltage input terminal VIN of the boost unit 11 is connected to the working voltage input VBAT of the boost control unit 4; at the same time, the enable signal of the enable control terminal EN of the boost unit 11 is pulled high, the boost unit 11 starts to work, and the voltage output terminal VOUT outputs a driving voltage. The driving voltage is 5V for example. At this time, the D flip-flop 10 does not work and outputs a logic low level.

[0088] Upon detecting the placement of a device to be charged, the voltage comparison unit 8 determines whether the voltage sampled and amplified by the wireless transmitter output is less than a reference voltage. If the voltage comparison unit 8 outputs a judgment result that the voltage is not less than the reference voltage, the D flip-flop 10 outputs a logic low level, and the system maintains charging, that is, the boost unit 11 remains awake. Conversely, if the voltage comparison unit 8 outputs a judgment result that the voltage is less than the reference voltage, the D flip-flop 10 outputs a logic high level, transistor Q1 is turned on, the enable control terminal EN of the boost unit 11 is pulled low, and the boost unit 11 enters sleep mode, that is, the wireless charging device enters sleep mode.

[0089] Figure 3 This is a schematic diagram of the control logic flow of the wireless charging control system of this embodiment. Figure 2 and Figure 3 Detailed description: In some embodiments, the wireless charging control system executes the following control logic: the device detection unit 1 determines whether the device to be charged is placed in the wireless charging device through the magnetic switch; when it is determined that the device to be charged is placed, the magnetic switch of the device detection unit 1 outputs a logic low level to the boost control unit 4, that is, the first enable signal is a low level; further, the boost control unit 4 wakes up the boost unit 11 after receiving the low level, so that it starts working, and the voltage output terminal VOUT outputs a 5V driving voltage.

[0090] When it is determined that the device to be charged is not placed in the wireless charging device, the magnetic switch of the device detection unit 1 outputs a logic high level to the boost control unit 4; after receiving the high level, the boost control unit 4 turns off the boost unit 11 and does not output the 5V driving voltage, and the wireless charging device enters sleep mode.

[0091] In other embodiments, after the boost unit 11 switches to the wake-up mode, the wireless transmitting unit 6 , the reference voltage unit 12 , the current detecting unit 7 , and the voltage comparing unit 8 start to work.

[0092] When the current detection unit 7 detects that the sinusoidal current signal generated by the wireless transmitting unit 6 is converted into a voltage signal, and the voltage comparison unit 8 determines that the voltage signal is greater than or equal to (i.e., not less than) the reference voltage threshold generated by the reference voltage unit 12, the voltage comparison unit 8 outputs a logic low level at this time; further, the D trigger 10 outputs a low level, and the boost control unit 4 maintains the boost output of the boost unit 11.

[0093] When the current detection unit 7 detects the current signal generated by the wireless transmitting unit 6 and converts it into a voltage signal, and amplifies the voltage signal, and the voltage comparison unit 8 determines that the voltage signal is less than the reference voltage threshold generated by the reference voltage unit 12, the voltage comparison unit 8 outputs a logic high level; further, the D trigger 10 outputs a high level, and the boost control unit 4 turns off the boost unit 11 after receiving the high level, and the wireless charging device enters sleep mode.

[0094] This application provides another embodiment of a wireless charging control system, based on any one of the embodiments of the above system, with reference to Figure 2 , also includes: a charging management unit 3 and an LED display unit 2.

[0095] The charging management unit 3 is connected between the battery 5 and the fixed power source to manage the charging process of the battery 5. The LED display unit 2 is connected to the battery 5 and is used to monitor the battery voltage using the voltage monitoring chip and display the remaining power through LED lights. The charging management unit 3 is also used to interrupt the current flow between the battery and the fixed power source after the battery is fully charged.

[0096] In some embodiments, the present application provides a wireless charging control system further including an anti-shake unit 9 .

[0097] The anti-shake unit 9 is connected to the voltage comparison unit 8 and the D flip-flop 10 , and includes an RC delay circuit for delaying and filtering the output signal of the voltage comparison unit.

[0098] refer to Figure 2 , the following Figure 2 Each unit is described in detail: In this embodiment, the wireless charging control system includes a device detection unit 1, an LED display unit 2, a charging management unit 3, a boost control unit 4, a battery 5, a wireless transmission unit 6, a current detection unit 7, a voltage comparison unit 8, an anti-shake unit 9, a D trigger 10, a boost unit 11, and a reference voltage unit 12.

[0099] The battery 5 is used to supply power to the equipment detection unit 1, LED display unit 2 and other power-consuming units, serving as the core power supply of the device.

[0100] The device detection unit 1 includes an omnipolar low-power magnetic switch, which outputs a low level when a magnetic field is detected, that is, when a device to be charged is placed in the device, and outputs a high level otherwise.

[0101] The LED display unit 2 includes a low-power voltage monitoring chip. When the battery voltage is detected to be lower than a threshold, the LED displays, otherwise it does not display.

[0102] The charging management unit 3 includes a charging management chip for battery charging management, and further includes current setting, charging process and full charge display.

[0103] After receiving the external signal feedback, the boost control unit 4 dynamically switches the logic state to control the working state of the boost unit, ie, the awake state and the dormant state.

[0104] The wireless transmitting unit 6 generates a sinusoidal signal of a fixed frequency through a transmitting coil and transmits it to the device to be charged.

[0105] The current detection unit 7 monitors the current value in the charging circuit in real time; and converts the current signal in the wireless transmitting unit 6 circuit into a voltage signal through a sampling resistor, and amplifies the voltage signal and transmits it to the reverse end of the voltage comparison unit 8.

[0106] The boost unit 11 is used to generate a 5V voltage to power the wireless transmitting unit 6 , the reference voltage unit 12 , the current detection unit 7 , and the voltage comparison unit 8 . This unit is controlled by the boost control unit 4 .

[0107] The reference voltage unit 12 includes a reference voltage chip, and is configured to generate a target reference voltage and transmit the target reference voltage to the non-inverting terminal of the voltage comparison unit 8 .

[0108] The voltage comparison unit 8 outputs a high level when the reference voltage generated by the reference voltage unit is greater than or equal to the voltage after passing through the current detection unit, and outputs a low level otherwise.

[0109] The anti-shake unit 9 includes an RC delay circuit, which delays and filters the signal output by the voltage comparison unit 8 .

[0110] The D flip-flop 10 is used to maintain the logic state output by the voltage comparison unit 8 after the voltage comparison unit 8 is powered off, thereby controlling the working state of the boost unit, ie, the awake state and the sleep state.

[0111] Based on the same concept, the present application also discloses a wireless charging device, which includes a wireless charging control system as in any of the above embodiments.

[0112] The wireless charging device integrates the transmitting coil, control circuit and structural design to transform the wireless charging control system of the present application into a product form that can be directly used by the user. Optionally, the wireless charging device in the present application is a wireless charging dock.

[0113] The boost control circuit, wireless charging control system and wireless charging device of the present application have the same technical concept, and the technical details of the embodiments of the three are applicable to each other. To reduce repetition, they will not be described again.

[0114] Those skilled in the art will clearly understand that, for the sake of convenience and brevity of description, only the division of the above-mentioned program modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program units or modules to complete all or part of the functions described above. The program modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one processing unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software program unit. In addition, the specific names of the program modules are only for the purpose of distinguishing each other and are not used to limit the scope of protection of this application.

[0115] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A boost control circuit for controlling the working state of a boost unit; characterized in that: The gate of the MOS transistor Q2 is the first signal input terminal, which is used to receive the first enable signal; the source is connected to the working voltage; the drain is connected to the voltage input terminal of the boost unit and is also connected to the collector of the transistor Q1; The base of the transistor Q1 is a second signal input terminal for receiving a second enable signal; the collector is connected to the enable control terminal of the boost unit; and the emitter is grounded; When the first enable signal is at a low level, the MOS tube Q2 is turned on, the voltage input terminal is connected to the working voltage, and the boost unit enters the awake state; When the first enable signal is at a low level and the second enable signal is at a high level, the transistor Q1 is turned on, the enable control terminal is grounded, and the boost unit enters a dormant state from the awake state.

2. The boost control circuit according to claim 1, wherein: When the first enable signal is at a high level, the MOS tube Q2 is turned off; there is no voltage input to the voltage input terminal, and the boost unit remains in a dormant state.

3. The boost control circuit according to claim 1, wherein: Also includes a first resistor, a second resistor and a third resistor; One end of the first resistor is connected to the drain of the MOS transistor Q2; the other end is connected to the collector of the transistor Q1; One end of the second resistor is connected to the gate of the MOS transistor Q2, and the other end is connected to the source of the MOS transistor Q2; One end of the third resistor is connected to the signal source of the second enable signal, and the other end is connected to the base of the transistor Q1.

4. A wireless charging control system, characterized in that: include: Battery, equipment detection unit, boost control unit, boost unit, voltage comparison unit and D flip-flop; Wherein, the boost control unit comprises the boost control circuit according to any one of claims 1 to 3; The battery is used as a mobile power source to provide operating voltage; The device detection unit is connected to the boost control unit, and is used to detect whether there is a device to be charged, and output the first enable signal to the boost control unit; the first enable signal is used to control the MOS transistor Q2 to be turned on or off; The boost unit generates a driving voltage in the awake state, and the driving voltage is used to drive the wireless transmitting module to generate a sinusoidal signal to wirelessly charge the device to be charged; The voltage comparison unit is used to compare the reference voltage with the voltage sampled and amplified by the wireless transmitting unit; The D trigger is connected to the voltage comparison unit and the boost control unit, and is used to output the second enable signal to the boost control unit based on the comparison result of the voltage comparison unit; the second enable signal is used to control the transistor Q1 to be turned on or off.

5. A wireless charging control system according to claim 4, characterized in that: When the device detection unit detects the presence of a device to be charged, the device detection unit generates the first enable signal as a low level; the boost control unit receives the first enable signal and controls the boost unit to enter a wake-up state; When the device detection unit detects that there is no device to be charged, the device detection unit generates the first enable signal as a high level; the boost control unit receives the first enable signal and controls the boost unit to maintain a dormant state.

6. A wireless charging control system according to claim 4, characterized in that: Also includes: A wireless transmitting unit connected to the boosting unit; Which includes the wireless transmission module; Used to generate a sinusoidal signal of a specified frequency and transmit it to the device to be charged when the boost unit is in an awake state; a current detection unit connected to the wireless transmitting unit and the voltage comparison unit; Used to convert the current generated by the wireless transmitting unit into a voltage through a sampling resistor, and amplify the voltage and transmit it to the reverse end of the voltage comparison unit; A reference voltage unit is connected to the voltage comparison unit and includes a reference voltage chip; and is used to generate the reference voltage and transmit the reference voltage to the same-direction end of the voltage comparison unit.

7. A wireless charging control system according to claim 6, characterized in that: When the voltage sampled and amplified by the wireless transmitting unit is lower than the reference voltage, the voltage comparison unit outputs a high level; the D flip-flop generates a second enable signal at a high level; the boost control unit receives the second enable signal and controls the boost unit to enter a sleep state from the wake-up state; When the voltage after sampling and amplification by the wireless transmitting unit is not less than the reference voltage, the voltage comparison unit outputs a low level; the D trigger generates the second enable signal as a low level; the boost control unit receives the second enable signal and controls the boost unit to maintain the awake state.

8. A wireless charging control system according to any one of claims 4 to 7, characterized in that: Also includes: a charging management unit connected between the battery and a fixed power source, and configured to manage the charging process of the battery; An LED display unit, connected to the battery, for monitoring the battery voltage based on a voltage monitoring chip and displaying the remaining power through LED lamp beads; The charging management unit is further configured to interrupt current transmission between the battery and the fixed power source after the battery is fully charged.

9. The wireless charging control system according to claim 4, wherein: Also includes: an anti-shake unit, connected to the voltage comparison unit and the D trigger; These include RC delay circuits; Used to delay and filter the output signal of the voltage comparison unit.

10. A wireless charging device, characterized in that: The wireless charging device includes the wireless charging control system according to any one of claims 4 to 9.

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