Wireless charging power supply device and control method of wireless charging power supply device

Abstract

The application relates to a wireless charging power supply device and a control method of a wireless charging power supply device. The wireless charging power supply device comprises a filter circuit and a DC / AC inverter. One side of the filter circuit is used for connecting AC power, and the other side is connected with the DC / AC inverter. The control method of the wireless charging power supply device obtains input AC active power, AC power information and inverter parameters of the DC / AC inverter, calculates an inverter parameter change amount of the DC / AC inverter, controls power switches in the DC / AC inverter to be turned on or turned off according to the inverter parameter change amount, and makes the circuit input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to pure resistance. Therefore, the phase of voltage and current in the wireless charging power supply device is the same, and active power factor correction is realized. The control method makes the wireless charging power supply device still realize power factor correction under the condition that an AC / DC adapter is omitted, reduces the power conversion series, and improves the use convenience.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and in particular to a control method for a wireless charging power supply device and a wireless charging power supply apparatus. Background Technology

[0002] With the promotion and popularization of wireless charging technology for smartphones, the technology is maturing and rapidly developing towards higher efficiency, higher power density, smaller size, and portability. Wireless charging technology is beginning to be applied to various industries, with increasingly higher power outputs.

[0003] Currently, wireless charging applications commonly use AC / DC adapters for power supply, rather than direct AC power. However, AC / DC adapters require two stages: a PFC (Power Factor Correction) power stage and a DC / DC isolation power stage. After the power enters the wireless charger, it typically requires two more stages: DC / DC voltage regulation and DC / AC inversion. This means a total of 3 to 4 power conversion stages are needed. Too many intermediate power conversion stages result in more components, larger size, and power loss at each stage. This not only increases cost and reduces efficiency but also limits further increases in power density, hinders product miniaturization, and makes the product inconvenient to use. Summary of the Invention

[0004] Therefore, it is necessary to provide a control method for wireless charging power supply equipment and wireless charging power supply device to address the inconvenience of using traditional wireless charging solutions.

[0005] In a first aspect, a wireless charging power supply device is provided, including a filter circuit, a DC / AC inverter, a main controller, and a communication module. The input terminal of the filter circuit is connected to AC power, and the output terminal is connected to the input terminal of the DC / AC inverter. The main controller is connected to the input terminal of the filter circuit, the DC / AC inverter, and the communication module.

[0006] The main controller acquires charging feedback information from the wireless power transmission receiver via the communication module, calculates the input AC active power based on the charging feedback information, acquires the AC power information connected to the filter circuit, calculates the inverter parameter changes of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, and controls the power switches in the DC / AC inverter to be turned on or off based on the inverter parameter changes, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity.

[0007] Secondly, a control method for a wireless charging power supply device is provided. The wireless charging power supply device includes a filter circuit and a DC / AC inverter. One side of the filter circuit is connected to AC power, and the other side is connected to the DC / AC inverter. The control method includes the following steps:

[0008] Obtain charging feedback information from the wireless power transmission receiver and calculate the input AC active power based on the charging feedback information;

[0009] Obtain the AC power information connected to the filter circuit;

[0010] Based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, calculate the change in the inverter parameters of the DC / AC inverter;

[0011] The power switch in the DC / AC inverter is turned on or off according to the change in the inverter parameters, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity.

[0012] The control method for the aforementioned wireless charging power supply equipment and device includes a filter circuit, a DC / AC inverter, a main controller, and a communication module. The input terminal of the filter circuit is connected to AC power, and the output terminal is connected to the input terminal of the DC / AC inverter. The main controller is connected to the input terminal of the filter circuit, the DC / AC inverter, and the communication module. The main controller obtains charging feedback information from the wireless power transmission receiver through the communication module and calculates the input AC active power based on the charging feedback information. It also obtains the AC power information connected to the filter circuit, calculates the inverter parameter changes of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, and controls the power switch in the DC / AC inverter to be turned on or off based on the inverter parameter changes, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity. One side of the filter circuit is used to receive AC power, and the other side is connected to a DC / AC inverter. The filter circuit converts the received AC power into DC power and transmits it to the DC / AC inverter. The DC / AC inverter can then couple to the wireless power transmission receiver via a magnetic field to achieve wireless charging. The main controller acquires the input AC active power, the received AC power information, and the inverter parameters of the DC / AC inverter. It calculates the changes in the inverter parameters and controls the power switches in the DC / AC inverter to turn on or off based on these changes. This makes the input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to purely resistive characteristics. Consequently, the voltage and current in the wireless charging power supply device are in phase, and the current waveform follows the voltage waveform, achieving active power factor correction. This wireless charging power supply device allows for power factor correction without an AC / DC adapter, reducing the number of power conversion stages, improving efficiency, reducing heat dissipation costs, and decreasing the number of power devices used, thus lowering costs, reducing size, and improving ease of use. Attached Figure Description

[0013] Figure 1 This is a structural block diagram of a wireless charging power supply device in one embodiment;

[0014] Figure 2 A flowchart of a control method for a wireless charging power supply device in one embodiment;

[0015] Figure 3 This is a schematic diagram illustrating the implementation principle of a control method for a wireless charging power supply device in one embodiment.

[0016] Figure 4 This is a schematic diagram illustrating the implementation principle of the control method for the wireless charging power supply device in another embodiment;

[0017] Figure 5A flowchart of a control method for a wireless charging power supply device in another embodiment;

[0018] Figure 6 A flowchart of a control method for a wireless charging power supply device in yet another embodiment;

[0019] Figure 7 A flowchart of a control method for a wireless charging power supply device in another embodiment;

[0020] Figure 8 A schematic diagram of the equivalent circuit location of a wireless charging power supply device in one embodiment;

[0021] Figure 9 This is an equivalent circuit diagram of a wireless charging power supply device in one embodiment. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following description, in conjunction with embodiments and accompanying drawings, provides a more comprehensive overview of the application. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the application.

[0023] In one embodiment, a wireless charging power supply device is provided, including a filter circuit, a DC / AC inverter, a main controller, and a communication module. The input terminal of the filter circuit is connected to AC power, and the output terminal is connected to the input terminal of the DC / AC inverter. The main controller is connected to the input terminal of the filter circuit, the DC / AC inverter, and the communication module. The main controller obtains charging feedback information from the wireless power transmission receiver through the communication module, calculates the input AC active power based on the charging feedback information, obtains the AC power information connected to the filter circuit, calculates the inverter parameter changes of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, and controls the power switch in the DC / AC inverter to be turned on or off based on the inverter parameter changes, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity.

[0024] Specifically, an AC input interface can be provided on one side of the filter circuit 100 for connecting AC power. The AC input interface can be a 110V / 220VAC AC input interface, and the total voltage range that can be connected is 85VAC-265VAC. After AC power is connected, the filter circuit 100 converts the AC power into DC power for processing by subsequent circuits. In this embodiment, the filter circuit 100 transmits the converted DC power to the DC / AC inverter 200. The structure of the filter circuit 100 is not unique. For example, the filter circuit 100 can be a rectifier filter circuit 120, which can rectify AC power into unidirectional pulsating DC power for processing by subsequent circuits. The structure of the rectifier filter circuit 120 includes, but is not limited to, diodes, rectifier bridges, capacitors, and other components.

[0025] In one embodiment, the filter circuit 100 may include both a rectifier filter circuit 120 and an EMC filter circuit 110. One side of the EMC filter circuit 110 is connected to AC power, and the other side is connected to the rectifier filter circuit 120. The rectifier filter circuit 120 is connected to the DC / AC inverter 200. The EMC filter circuit 110 enables the wireless charging power supply device to meet electromagnetic compatibility regulations regarding radiation and conduction. The structure of the EMC filter circuit 110 includes, but is not limited to, common-mode inductors, differential-mode inductors, X capacitors, and Y capacitors. It is understood that in other embodiments, the filter circuit 100 may also have other structures, as long as those skilled in the art deem it feasible.

[0026] The DC / AC inverter 200 is a resonant inverter that converts high-voltage pulsating direct current into high-frequency alternating current, facilitating magnetic coupling to the receiver of a WPT (Wireless Power Transmission). Furthermore, through the control method of the wireless charging power supply device described in this application, it can also perform PFC (Power Factor Correction) functionality. The structure of the DC / AC inverter 200 is not unique; it can also be a half-bridge resonant inverter (see [link to relevant documentation]). Figure 3 It can also be a full-bridge resonant inverter (see [link]). Figure 4 The DC / AC inverter 200 includes, but is not limited to, devices such as transmitting coils, MOS, GaN, diodes, and capacitors.

[0027] The communication module 300 is used to enable communication between the DC / AC inverter 200 and the wireless power transmission receiver, including but not limited to common near-field wireless communication methods such as NFC, 315MHz, 433MHz, and 2.4GHz. Its main function is to enable communication between the WPT transmitter and receiver to form a closed-loop control and other information exchange. For example, the DC / AC inverter, as the transmitter, informs the receiver (the device being charged, such as a mobile phone) of its load capacity, and the receiver informs the transmitter of information such as output voltage and current.

[0028] The main controller is the core logic control circuit, implemented using a software-programmable digital chip, and is responsible for the logic control of the entire system. The type of main controller is not unique; it can be, for example, a Microcontroller Unit (MCU), a Digital Signal Processor (DSP), or a Field-Programmable Gate Array (FPGA). The main controller can connect to a filter circuit to acquire the AC power information supplied to it. It can also connect to a DC / AC inverter to acquire inverter parameters, calculate parameter changes, and control the power switches in the inverter to turn on or off.

[0029] The main controller first obtains charging feedback information from the wireless power transmission receiver via the communication module, and calculates the input AC active power based on this information. Specifically, the input AC active power is proportional to the WPT transmission output power, and the input AC active power can be obtained by acquiring the WPT output power. The communication module 300 enables communication between the DC / AC inverter 200 and the WPT receiver. Therefore, the main controller can obtain charging feedback information from the WPT receiver, such as the receiver's voltage and current information, through the communication module 300, to calculate the WPT transmission output power, thereby obtaining the input AC active power.

[0030] Then, the main controller acquires the AC power information connected to the filter circuit. This AC power information can be phase angle information or amplitude information, etc. In this embodiment, phase angle information is taken as an example. Phase angle information refers to the instantaneous phase angle of the AC power connected to the filter circuit 100, which can be used as the basis for subsequent calculations and processing. The method of acquiring phase angle information is not unique. For example, it can be acquired directly through specific circuits or devices, or it can be acquired by collecting other parameters of the AC power and then calculating the phase angle information of the AC power connected to the filter circuit 100 using these collected AC power parameters. The specific acquisition method can be selected according to actual needs, as long as it is deemed feasible by those skilled in the art.

[0031] Next, the main controller calculates the change in inverter parameters of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter. The input AC active power and the connected AC power information reflect relevant information about the AC power connected to the filter circuit 100, such as the input AC power, which has already been obtained in previous steps. The change in inverter parameters of the DC / AC inverter 200 reflects relevant information about the DC / AC inverter 200, such as the transmission power. Based on the relationship between the AC power connected to and output by the wireless charging power supply device, the target value of the inverter parameter change can be calculated. The inverter parameter change refers to the difference or ratio between the initial and final values ​​of the inverter parameters within a certain time period; a certain time period can be considered as one switching cycle.

[0032] Then, the main controller controls the power switches in the DC / AC inverter to turn on or off based on the changes in inverter parameters, making the input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to purely resistive characteristics. Specifically, when the input impedance characteristics of the filter circuit 100 and the DC / AC inverter 200 are equivalent to purely resistive characteristics, the filter circuit 100 and the DC / AC inverter 200 can be considered as a single resistor. Therefore, the AC input current waveform naturally tracks the AC input voltage waveform, and PF is close to 1, thus achieving APFC control.

[0033] To prevent harmonic current interference to the power grid caused by reactive power during electronic equipment operation, relevant regulations impose strict requirements on current harmonics in power supplies with a power rating greater than 75W. To meet these regulations and address current harmonic issues, high-power power supplies must possess Power Factor Correction (PFC) functionality. The purpose of PFC is to ensure that the AC input current tracks the AC input voltage waveform, reducing or eliminating reactive power generation. Ideally (PF value equals 1), when the current waveform perfectly tracks the input voltage waveform, the PF value is 1, and no reactive power is generated. This ideal situation is unattainable; typically, a PF value greater than 0.9 is sufficient to meet regulatory requirements.

[0034] A DC / AC inverter 200 typically includes two or more power switches, which are generally switching transistors, such as MOSFETs or bipolar transistors, etc., without limitation. The main controller is connected to the control terminal of the power switch and turns the power switch on or off by sending a high or low level to the control terminal. Furthermore, the main controller can adjust the switching frequency of the power switch by adjusting the number and frequency of high or low level signals sent to the power switch. The DC / AC inverter 200 adopts a resonant half-bridge or resonant full-bridge topology. According to the characteristics of this resonant topology, the amount of power transmitted to the WPT receiver in each switching cycle is reflected in the change of the electrical parameters of the resonant capacitor in each switching cycle. Therefore, by controlling the change in the electrical parameters of the resonant capacitor, the power transmitted to the WPT receiver can be controlled.

[0035] When the power switch is in different switching combinations or at different switching frequencies, the operating state of the resonant capacitor in the DC / AC inverter 200 will also be different. Therefore, the electrical parameters of the resonant capacitor can be adjusted by turning the power switch in the DC / AC inverter 200 on or off, ensuring that the change in the electrical parameters of the resonant capacitor meets the target value. When the resonant capacitor operates at the target value, the input impedance characteristics of the filter circuit 100, the DC / AC inverter 200, and the communication module 300 are equivalent to purely resistive characteristics. This allows the single-stage DC / AC inverter 200 (resonant converter) to perform WPT (wireless power transmission transmitter) transmission while also fulfilling the APFC (Analog-Assisted Current Generation) function, i.e., ensuring that the input current waveform tracks the input voltage waveform as closely as possible to meet regulatory requirements.

[0036] In one embodiment, the AC power information includes phase angle information, and the inverter parameters include the capacitance value of the resonant capacitor in the DC / AC inverter. When the main controller calculates the change in inverter parameters of the DC / AC inverter based on the input AC active power, the AC power information, and the inverter parameters of the DC / AC inverter, it is used to calculate the change in electrical parameters of the resonant capacitor based on the input AC active power, the phase angle information, and the capacitance value of the resonant capacitor in the DC / AC inverter.

[0037] Specifically, phase angle information refers to the instantaneous phase angle of the AC power connected to the filter circuit 100, which can be used as the basis for subsequent calculations and processing. There is no single way to obtain phase angle information. For example, it can be obtained directly through specific circuits or devices, or it can be obtained by collecting other parameters of the AC power and then calculating the phase angle information of the AC power connected to the filter circuit 100 using these collected AC power parameters.

[0038] The inverter parameter changes in the DC / AC inverter include the changes in the electrical parameters of the resonant capacitor. The input AC active power and the connected AC power information reflect relevant information about the AC power connected to the filter circuit 100, such as the input AC power. This information has already been obtained in previous steps. The capacitance value and the changes in the electrical parameters of the resonant capacitor in the DC / AC inverter 200 reflect relevant information about the DC / AC inverter 200, such as the transmit power. The capacitance value of the resonant capacitor can be obtained after determining the structure of the DC / AC inverter 200.

[0039] In one embodiment, when the main controller controls the power switches in the DC / AC inverter to turn on or off based on changes in inverter parameters, making the input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to purely resistive, it is used for:

[0040] Based on the change in the electrical parameters of the resonant capacitor, the power switch in the DC / AC inverter is controlled to turn on or off, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters and operate at the target value of electrical parameters.

[0041] When the resonant capacitor operates at its target electrical parameter value, the input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to purely resistive characteristics. Based on the obtained change in the electrical parameters of the resonant capacitor, the power switch in the DC / AC inverter can be controlled to turn on or off, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters, and the changed resonant capacitor operates at its target electrical parameter value.

[0042] In one embodiment, the main controller can obtain the phase angle information of the connected AC power by tracking and locking the phase of the input voltage connected to the filter circuit through a phase-locked loop (PLL). Specifically, a PLL is a feedback circuit. The function of the PLL is to synchronize the phase of the circuit's clock with that of an external clock. During operation, when the frequency of the output signal is equal to the frequency of the input signal, the output voltage and input voltage maintain a fixed phase difference, i.e., the phases of the output voltage and input voltage are locked. The PLL is also used to connect to AC power and is connected to the main controller. The main controller can obtain the phase angle information of the connected AC power through the output voltage of the PLL; the acquisition process is direct and simple.

[0043] In one embodiment, when the main controller controls the power switch in the DC / AC inverter to turn on or off, causing the electrical parameters of the resonant capacitor to change according to the change in electrical parameters, it is used to:

[0044] The real-time electrical parameters of the resonant capacitor are collected, and the power switches in the DC / AC inverter are turned on or off according to the real-time electrical parameters, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters.

[0045] The main controller is connected to the DC / AC inverter 200, specifically to the resonant capacitor in the DC / AC inverter 200, and is used to collect the real-time electrical parameters of the resonant capacitor, such as real-time voltage or real-time current. It is understood that in other embodiments, the main controller may also collect the real-time electrical parameters of the resonant capacitor at preset time intervals, as long as those skilled in the art deem it feasible.

[0046] After obtaining the real-time electrical parameters of the resonant capacitor, the final adjusted value of the resonant capacitor's electrical parameters can be obtained based on the real-time electrical parameters and their changes. This final value is then used to control the power switch in the DC / AC inverter 200 to turn on or off, causing the resonant capacitor's electrical parameters to change according to the changes in its electrical parameters. Generally, the acquisition of the resonant capacitor's real-time electrical parameters and the control of the power switch in the DC / AC inverter 200 are performed within one switching cycle. The same operation is performed in each switching cycle to ensure more accurate control of the wireless charging power supply device.

[0047] In one embodiment, when the main controller acquires the phase angle information of the AC power supplied to the filter circuit, it is used to:

[0048] The amplitude, instantaneous peak value, zero-crossing point, and phase of the AC power connected to the filter circuit are obtained, and the phase angle information of the connected AC power is calculated based on the amplitude, instantaneous peak value, zero-crossing point, and phase.

[0049] The main controller can also be connected to the filter circuit 100, specifically to the side of the filter circuit 100 connected to the AC power supply. When the filter circuit 100 includes both the rectifier filter circuit 120 and the EMC filter circuit 110, the main controller can be connected to the common terminal of the rectifier filter circuit 120 and the EMC filter circuit 110 to obtain the electrical parameter information of the AC power supply. In this embodiment, the electrical parameter information of the AC power supply includes the amplitude, instantaneous peak value, zero crossing point, and phase of the AC power supply, which serve as the basis for subsequent calculations.

[0050] After obtaining the amplitude, instantaneous peak value, zero-crossing point, and phase of the alternating current, the phase angle information of the connected alternating current can be calculated based on some or all of these parameters. For example, the phase angle information can be obtained directly from the phase of the alternating current, or it can be calculated from the amplitude and zero-crossing point of the alternating current. The specific calculation method can be selected according to actual needs and is not limited here.

[0051] In one embodiment, when the main controller calculates the change in inverter parameters of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, it is used to:

[0052] The instantaneous input AC power is calculated based on the input AC active power and the connected AC power information. The expression for the transmitter output power of the DC / AC inverter is obtained based on the inverter parameters and the change in the inverter parameters. Based on the matching relationship between the transmitter output power and the input AC instantaneous power, the change in inverter parameters is calculated.

[0053] Specifically, the AC power input can be phase angle information. After obtaining the input AC active power and phase angle information, the instantaneous input AC power can be calculated using a formula. To simplify the formula, assuming the initial phase of the input AC is zero, then according to circuit theory, the instantaneous input AC power can be expressed as:

[0054] P ac =2·P RMS sin(θ) 2 (1)

[0055] Among them, P ac For the input AC instantaneous power, P RMS The input AC active power is θ, which is the instantaneous phase angle of the input AC, i.e., the phase angle information.

[0056] The inverter parameters can be the resonant capacitor electrical parameters. The type of resonant capacitor electrical parameters is not unique; for example, it can be the resonant capacitor voltage or the resonant capacitor current. When the resonant capacitor electrical parameter is the resonant capacitor voltage, the expression for the transmitter output power of the DC / AC inverter 200 is:

[0057]

[0058] Among them, P wpt For the transmitter output power of the DC / AC inverter 200, taking one switching cycle as an example, P wpt The transmit power output from DC / AC inverter 200 to WPT receiver is given by C in one switching cycle. C is the capacitance of the resonant capacitor, and ΔU is the change in voltage of the resonant capacitor. Taking one switching cycle as an example, ΔU is the change in voltage of the resonant capacitor within one switching cycle.

[0059] The resonant capacitor voltage is the integral of the resonant capacitor current. The same control effect can be obtained by processing the resonant capacitor current. Therefore, the resonant capacitor electrical parameters can also be the resonant capacitor current. It is only necessary to convert the resonant capacitor voltage in equation (2) into the resonant capacitor current according to the rules.

[0060] Matching can be equal or close. In this embodiment, the APFC function is achieved by making the output power of the DC / AC inverter 200 transmitted to the wireless power transmission receiver equal to the instantaneous input AC power. Based on Pac =P wpt Taking the resonant capacitor voltage as an example, the relationship can be simplified to obtain:

[0061]

[0062] Among them, P RMS Let θ be the input AC active power, θ be the instantaneous phase angle of the input AC, C be the resonant capacitor capacitance, and ΔU be the change in resonant capacitor voltage. The value of ΔU can be obtained according to equation (3). It can be understood that in other embodiments, the target value of the resonant capacitor current can also be calculated based on equations (1)-(3) and the relationship between the resonant capacitor voltage and the resonant capacitor current, which will not be elaborated here.

[0063] In one embodiment, the change in the electrical parameters of the resonant capacitor includes either the change in the resonant capacitor voltage or the change in the resonant capacitor current. The resonant capacitor voltage is the integral of the resonant capacitor current; therefore, processing based on the resonant capacitor current can also achieve the same control effect. Based on equations (1)-(3) and the relationship between the resonant capacitor voltage and the resonant capacitor current, the change in the resonant capacitor current can also be calculated, which will not be elaborated here.

[0064] In one embodiment, the wireless charging power supply device further includes a drive circuit connected between the main controller and the DC / AC inverter. The drive circuit controls the opening and closing of the power switch of the DC / AC inverter 200 (half-bridge or full-bridge). This module can be a standalone circuit or integrated into other modules, such as with the power switch or with the main controller.

[0065] In one embodiment, the filter circuit 100 includes an EMC filter circuit 110 and a rectifier filter circuit 120. One side of the EMC filter circuit 110 is connected to AC power, and the other side is connected to the rectifier filter circuit 120, which is connected to the DC / AC inverter 200. The EMC filter circuit 110 enables the wireless charging power supply device to meet electromagnetic compatibility regulations regarding radiation and conduction. The structure of the EMC filter circuit 110 includes, but is not limited to, common-mode inductors, differential-mode inductors, X capacitors, Y capacitors, etc., while the structure of the rectifier filter circuit 120 includes, but is not limited to, diodes, rectifier bridges, capacitors, etc. It is understood that in other embodiments, the filter circuit 100 may also have other structures, as long as those skilled in the art deem it feasible.

[0066] In one embodiment, the DC / AC inverter 200 is either a half-bridge resonant inverter or a full-bridge resonant inverter. The choice can be made based on the actual situation, provided that it is feasible for those skilled in the art.

[0067] In one embodiment, the wireless charging power supply device further includes an AC power information acquisition module connected between the main controller and the input terminal of the filter circuit, used to acquire AC power information connected to the filter circuit as the basis for subsequent calculations, such as acquiring phase angle information.

[0068] In one embodiment, the wireless charging power supply device further includes a voltage acquisition module and / or a current acquisition module connected between the main controller and the output terminal of the DC / AC inverter. The voltage acquisition module is used to acquire the voltage of the DC / AC inverter, and the current acquisition module is used to acquire the current of the DC / AC inverter. The change in the electrical parameters of the resonant capacitor includes the change in the resonant capacitor voltage or the change in the resonant capacitor current. The voltage acquisition module can acquire the voltage of the DC / AC inverter and send it to the main controller. The main controller controls the power switch in the DC / AC inverter to turn on or off based on the calculated change in the resonant capacitor voltage, thus changing the voltage of the resonant capacitor. Alternatively, the current acquisition module can acquire the current of the DC / AC inverter and send it to the main controller. The main controller controls the power switch in the DC / AC inverter to turn on or off based on the calculated change in the resonant capacitor current, thus changing the current of the resonant capacitor.

[0069] The aforementioned wireless charging power supply device includes a filter circuit, a DC / AC inverter, a main controller, and a communication module. The input terminal of the filter circuit is connected to AC power, and the output terminal is connected to the input terminal of the DC / AC inverter. The main controller is connected to the input terminal of the filter circuit, the DC / AC inverter, and the communication module. The main controller obtains charging feedback information from the wireless power transmission receiver through the communication module and calculates the input AC active power based on the charging feedback information; obtains the AC power information connected to the filter circuit; calculates the inverter parameter changes of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter; and controls the power switch in the DC / AC inverter to be turned on or off based on the inverter parameter changes, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity. One side of the filter circuit is used to receive AC power, and the other side is connected to a DC / AC inverter. The filter circuit converts the received AC power into DC power and transmits it to the DC / AC inverter. The DC / AC inverter can then couple to the wireless power transmission receiver via a magnetic field to achieve wireless charging. The main controller acquires the input AC active power, the received AC power information, and the inverter parameters of the DC / AC inverter. It calculates the changes in the inverter parameters and controls the power switches in the DC / AC inverter to turn on or off based on these changes. This makes the input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to purely resistive characteristics. Consequently, the voltage and current in the wireless charging power supply device are in phase, and the current waveform follows the voltage waveform, achieving active power factor correction. This wireless charging power supply device allows for power factor correction without an AC / DC adapter, reducing the number of power conversion stages, improving efficiency, reducing heat dissipation costs, and decreasing the number of power devices used, thus lowering costs, reducing size, and improving ease of use.

[0070] In one embodiment, a control method for a wireless charging power supply device is provided, the method being used to control the wireless charging power supply device. See also... Figure 1 The wireless charging power supply device includes a filter circuit 100 and a DC / AC inverter 200. One side of the filter circuit 100 is connected to AC power, and the other side is connected to the DC / AC inverter 200. The control method of the wireless charging power supply device can be executed by the main controller; please refer to [link to relevant documentation]. Figure 2 The control method for the wireless charging power supply device includes the following steps:

[0071] Step S200: Obtain charging feedback information from the wireless power transmission receiver and calculate the input AC active power based on the charging feedback information.

[0072] Specifically, the input AC active power is proportional to the WPT transmission output power, and the input AC active power can be obtained by acquiring the WPT output power. The communication module 300 enables communication between the DC / AC inverter 200 and the WPT receiver. Therefore, the main controller can obtain charging feedback information from the WPT receiver, such as the receiver's voltage and current information, through the communication module 300, to calculate the WPT transmission output power and thus obtain the input AC active power.

[0073] Step S400: Obtain the AC power information connected to the filter circuit.

[0074] The AC power information received can be phase angle information or amplitude information, etc. In this embodiment, phase angle information is taken as an example. Phase angle information refers to the instantaneous phase angle of the AC power received by the filter circuit 100, which can be used as the basis for subsequent calculations and processing. There is no single way to obtain phase angle information. For example, it can be obtained directly through a specific circuit or device structure, or it can be obtained by collecting other parameters of the AC power and then calculating the phase angle information of the AC power received by the filter circuit 100 through these collected AC power parameters. The specific method of acquisition can be selected according to actual needs, as long as it is deemed feasible by those skilled in the art.

[0075] Step S600: Calculate the change in inverter parameters of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter.

[0076] The input AC active power and the connected AC power information can reflect relevant information about the AC power connected to the filter circuit 100, such as the input AC power. This information has already been obtained in previous steps. The changes in the inverter parameters of the DC / AC inverter 200 can reflect relevant information about the DC / AC inverter 200, such as the transmission power. Based on the relationship between the AC power connected to and output by the wireless charging power supply device, the target value of the inverter parameter change can be calculated. The inverter parameter change refers to the difference or ratio between the initial and final values ​​of the inverter parameters within a certain time period; a certain time period can be considered as one switching cycle.

[0077] Step S800: Control the power switch in the DC / AC inverter to turn on or off according to the change in inverter parameters, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity.

[0078] When the circuit input impedance characteristics of the filter circuit 100 and the DC / AC inverter 200 are equivalent to pure resistive characteristics, the filter circuit 100 and the DC / AC inverter 200 can be equivalent to a resistor. Therefore, the AC input current waveform naturally tracks the AC input voltage waveform, and PF is close to 1, which means that APFC control can be completed.

[0079] To prevent harmonic current interference to the power grid caused by reactive power during electronic equipment operation, relevant regulations impose strict requirements on current harmonics in power supplies with a power rating greater than 75W. To meet these regulations and address current harmonic issues, high-power power supplies must possess Power Factor Correction (PFC) functionality. The purpose of PFC is to ensure that the AC input current tracks the AC input voltage waveform, reducing or eliminating reactive power generation. Ideally (PF value equals 1), when the current waveform perfectly tracks the input voltage waveform, the PF value is 1, and no reactive power is generated. This ideal situation is unattainable; typically, a PF value greater than 0.9 is sufficient to meet regulatory requirements.

[0080] A DC / AC inverter 200 typically includes two or more power switches, which are generally switching transistors, such as MOSFETs or bipolar transistors, etc., without limitation. The main controller is connected to the control terminal of the power switch and turns the power switch on or off by sending a high or low level to the control terminal. Furthermore, the main controller can adjust the switching frequency of the power switch by adjusting the number and frequency of high or low level signals sent to the power switch. The DC / AC inverter 200 adopts a resonant half-bridge or resonant full-bridge topology. According to the characteristics of this resonant topology, the amount of power transmitted to the WPT receiver in each switching cycle is reflected in the change of the electrical parameters of the resonant capacitor in each switching cycle. Therefore, by controlling the change in the electrical parameters of the resonant capacitor, the power transmitted to the WPT receiver can be controlled.

[0081] When the power switch is in different switching combinations or at different switching frequencies, the operating state of the resonant capacitor in the DC / AC inverter 200 will also be different. Therefore, the electrical parameters of the resonant capacitor can be adjusted by turning the power switch in the DC / AC inverter 200 on or off, ensuring that the change in the electrical parameters of the resonant capacitor meets the target value. When the resonant capacitor operates at the target value, the input impedance characteristics of the filter circuit 100, the DC / AC inverter 200, and the communication module 300 are equivalent to purely resistive characteristics. This allows the single-stage DC / AC inverter 200 (resonant converter) to perform WPT (wireless power transmission transmitter) transmission while also fulfilling the APFC (Analog-Assisted Current Generation) function, i.e., ensuring that the input current waveform tracks the input voltage waveform as closely as possible to meet regulatory requirements.

[0082] In one embodiment, inverter parameters include the capacitance value of the resonant capacitor in the DC / AC inverter; please refer to [link to relevant documentation]. Figure 5Step S400 includes step S410, and step S600 includes step S610.

[0083] Step S410: Obtain the phase angle information of the AC power connected to the filter circuit.

[0084] Phase angle information refers to the instantaneous phase angle of the AC power connected to the filter circuit 100, which can be used as the basis for subsequent calculations and processing. There is no single way to obtain phase angle information. For example, it can be obtained directly through specific circuits or devices, or it can be obtained by collecting other parameters of the AC power and then calculating the phase angle information of the AC power connected to the filter circuit 100 using these collected AC power parameters.

[0085] Step S610: Calculate the change in electrical parameters of the resonant capacitor based on the input AC active power, phase angle information, and the capacitance value of the resonant capacitor in the DC / AC inverter.

[0086] The inverter parameter changes in the DC / AC inverter include the changes in the electrical parameters of the resonant capacitor. The input AC active power and the connected AC power information reflect relevant information about the AC power connected to the filter circuit 100, such as the input AC power. This information has already been obtained in previous steps. The capacitance value and the changes in the electrical parameters of the resonant capacitor in the DC / AC inverter 200 reflect relevant information about the DC / AC inverter 200, such as the transmit power. The capacitance value of the resonant capacitor can be obtained after determining the structure of the DC / AC inverter 200.

[0087] In one embodiment, see Figure 5 Step S800 includes step S810.

[0088] Step S810: Based on the change in the electrical parameters of the resonant capacitor, control the power switch in the DC / AC inverter to turn on or off, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters and operate at the target value of electrical parameters.

[0089] When the resonant capacitor operates at its target electrical parameter value, the input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to purely resistive characteristics. Based on the obtained change in the electrical parameters of the resonant capacitor, the power switch in the DC / AC inverter can be controlled to turn on or off, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters, and the changed resonant capacitor operates at its target electrical parameter value.

[0090] In one embodiment, see Figure 6 Step S410 includes step S411.

[0091] Step S411: The phase angle information of the input voltage connected to the filter circuit is obtained by tracking the phase of the phase-locked loop.

[0092] Specifically, a phase-locked loop (PLL) is a type of feedback circuit. The function of a PLL is to synchronize the phase of the circuit's clock with an external clock. During operation, when the frequency of the output signal equals the frequency of the input signal, the output voltage maintains a fixed phase difference with the input voltage; that is, the phases of the output and input voltages are locked. PLLs are also used to connect to alternating current (AC) and are linked to a main controller. The main controller can obtain the phase angle information of the AC power supply through the PLL's output voltage; the acquisition process is direct and simple.

[0093] In one embodiment, see Figure 7 Step S410 includes steps S412 and S413.

[0094] Step S412: Obtain the amplitude, instantaneous peak value, zero crossing point, and phase of the AC power connected to the filter circuit.

[0095] The main controller can also be connected to the filter circuit 100, specifically to the side of the filter circuit 100 connected to the AC power supply. When the filter circuit 100 includes both the rectifier filter circuit 120 and the EMC filter circuit 110, the main controller can be connected to the common terminal of the rectifier filter circuit 120 and the EMC filter circuit 110 to obtain the electrical parameter information of the AC power supply. In this embodiment, the electrical parameter information of the AC power supply includes the amplitude, instantaneous peak value, zero crossing point, and phase of the AC power supply, which serve as the basis for subsequent calculations.

[0096] Step S413: Calculate the phase angle information of the connected AC power based on the amplitude, instantaneous peak value, zero crossing point and phase.

[0097] After obtaining the amplitude, instantaneous peak value, zero-crossing point, and phase of the alternating current, the phase angle information of the connected alternating current can be calculated based on some or all of these parameters. For example, the phase angle information can be obtained directly from the phase of the alternating current, or it can be calculated from the amplitude and zero-crossing point of the alternating current. The specific calculation method can be selected according to actual needs and is not limited here.

[0098] In one embodiment, see Figure 6 Step S600 includes steps S621 to S623.

[0099] Step S621: Calculate the instantaneous input AC power based on the input AC active power and the connected AC power information.

[0100] Specifically, the AC power input can be phase angle information. After obtaining the input AC active power and phase angle information, the instantaneous input AC power can be calculated using a formula. To simplify the formula, assuming the initial phase of the input AC is zero, then according to circuit theory, the instantaneous input AC power can be expressed as:

[0101] P ac =2·P RMS sin(θ) 2 (1)

[0102] Among them, P ac For the input AC instantaneous power, P RMS The input AC active power is θ, which is the instantaneous phase angle of the input AC, i.e., the phase angle information.

[0103] Step S622: Based on the inverter parameters of the DC / AC inverter and the change in the inverter parameters of the DC / AC inverter, obtain the expression for the output power of the transmitter of the DC / AC inverter.

[0104] Specifically, the inverter parameters can be the resonant capacitor electrical parameters. The type of resonant capacitor electrical parameters is not unique; for example, it can be the resonant capacitor voltage or the resonant capacitor current. When the resonant capacitor electrical parameter is the resonant capacitor voltage, the expression for the transmitter output power of the DC / AC inverter 200 is:

[0105]

[0106] Among them, P wpt For the transmitter output power of the DC / AC inverter 200, taking one switching cycle as an example, P wpt The transmit power output from DC / AC inverter 200 to WPT receiver is given by C in one switching cycle. C is the capacitance of the resonant capacitor, and ΔU is the change in voltage of the resonant capacitor. Taking one switching cycle as an example, ΔU is the change in voltage of the resonant capacitor within one switching cycle.

[0107] The resonant capacitor voltage is the integral of the resonant capacitor current. The same control effect can be obtained by processing the resonant capacitor current. Therefore, the resonant capacitor electrical parameters can also be the resonant capacitor current. It is only necessary to convert the resonant capacitor voltage in equation (2) into the resonant capacitor current according to the rules.

[0108] Step S623: Based on the matching relationship between the output power of the transmitter and the instantaneous AC input power, calculate the change in inverter parameters.

[0109] Specifically, matching can be equal or similar. In this embodiment, APFC function can be achieved by making the output power of the DC / AC inverter 200 transmitted to the wireless power transmission receiver equal to the instantaneous input AC power. Based on P ac =P wpt Taking the resonant capacitor voltage as an example, the relationship can be simplified to obtain:

[0110]

[0111] Among them, P RMS Let θ be the input AC active power, θ be the instantaneous phase angle of the input AC, C be the resonant capacitor capacitance, and ΔU be the change in resonant capacitor voltage. The value of ΔU can be obtained according to equation (3). It can be understood that in other embodiments, the target value of the resonant capacitor current can also be calculated based on equations (1)-(3) and the relationship between the resonant capacitor voltage and the resonant capacitor current, which will not be elaborated here.

[0112] In one embodiment, the change in the electrical parameters of the resonant capacitor includes either the change in the resonant capacitor voltage or the change in the resonant capacitor current. The resonant capacitor voltage is the integral of the resonant capacitor current; therefore, processing based on the resonant capacitor current can also achieve the same control effect. Based on equations (1)-(3) and the relationship between the resonant capacitor voltage and the resonant capacitor current, the change in the resonant capacitor current can also be calculated, which will not be elaborated here.

[0113] In one embodiment, step S810 involves controlling the power switch in the DC / AC inverter to be turned on or off, causing the electrical parameters of the resonant capacitor to change according to the change in electrical parameters, including steps 811 and 812.

[0114] Step 811: Collect the real-time electrical parameters of the resonant capacitor.

[0115] The main controller is connected to the DC / AC inverter 200, specifically to the resonant capacitor in the DC / AC inverter 200, and is used to collect the real-time electrical parameters of the resonant capacitor, such as real-time voltage or real-time current. It is understood that in other embodiments, the main controller may also collect the real-time electrical parameters of the resonant capacitor at preset time intervals, as long as those skilled in the art deem it feasible.

[0116] Step S812: Control the power switch in the DC / AC inverter to turn on or off according to the real-time electrical parameters, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters.

[0117] After obtaining the real-time electrical parameters of the resonant capacitor, the final adjusted value of the resonant capacitor's electrical parameters can be obtained based on the real-time electrical parameters and their changes. This final value is then used to control the power switch in the DC / AC inverter 200 to turn on or off, causing the resonant capacitor's electrical parameters to change according to the changes in its electrical parameters. Generally, the acquisition of the resonant capacitor's real-time electrical parameters and the control of the power switch in the DC / AC inverter 200 are performed within one switching cycle. The same operation is performed in each switching cycle to ensure more accurate control of the wireless charging power supply device.

[0118] The control method for the aforementioned wireless charging power supply device includes a filter circuit and a DC / AC inverter. One side of the filter circuit is connected to AC power, and the other side is connected to the DC / AC inverter. The filter circuit can convert the input AC power into DC power and transmit it to the DC / AC inverter. The DC / AC inverter can couple to the wireless power transmission receiver through a magnetic field to realize wireless charging. The control method of the wireless charging power supply device obtains the input AC active power, the information of the input AC power, and the inverter parameters of the DC / AC inverter, calculates the change in the inverter parameters of the DC / AC inverter, and controls the power switch in the DC / AC inverter to be turned on or off according to the change in inverter parameters. This makes the circuit input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to pure resistivity. Then, the voltage and current in the wireless charging power supply device are in phase, and the current waveform follows the voltage waveform, realizing active power factor correction. This control method enables the wireless charging power supply device to still achieve power factor correction without the need for an AC / DC adapter. It reduces the number of power conversion stages, improves efficiency, helps reduce heat dissipation costs, and reduces the number of power devices used, thus lowering costs, reducing size, and improving the ease of use of the control method for the wireless charging power supply device.

[0119] In one embodiment, a control device for a wireless charging power supply device is provided. The wireless charging power supply device includes a filter circuit 100 and a DC / AC inverter. One side of the filter circuit 100 is connected to AC power, and the other side is connected to the DC / AC inverter 200. The control device for the wireless charging power supply device includes an input AC active power acquisition module, a phase angle information acquisition module, a target value calculation module, and a switching module. The input AC active power acquisition module is used to acquire charging feedback information from the wireless power transmission receiver and calculate the input AC active power based on the charging feedback information. The phase angle information acquisition module is used to acquire the AC power information connected to the filter circuit 100. The target value calculation module is used to calculate the change in inverter parameters of the DC / AC inverter based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter. The switching module is used to control the power switch in the DC / AC inverter to be turned on or off according to the change in inverter parameters, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity.

[0120] The various modules in the control device of the aforementioned wireless charging power supply device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0121] The control device for the aforementioned wireless charging power supply device includes a filter circuit and a DC / AC inverter. One side of the filter circuit is used to connect to AC power, and the other side is connected to the DC / AC inverter. The filter circuit can convert the connected AC power into DC power and transmit it to the DC / AC inverter. The DC / AC inverter can be coupled to the wireless power transmission receiver through a magnetic field to realize wireless charging. The control method of the wireless charging power supply device obtains the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, calculates the change in the inverter parameters of the DC / AC inverter, and controls the power switch in the DC / AC inverter to be turned on or off according to the change in inverter parameters. This makes the circuit input impedance characteristics of the filter circuit and the DC / AC inverter equivalent to pure resistivity. Then, the voltage and current in the wireless charging power supply device are in phase, and the current waveform follows the voltage waveform, realizing active power factor correction. This control method enables the wireless charging power supply device to still achieve power factor correction without the need for an AC / DC adapter. It reduces the number of power conversion stages, improves efficiency, helps reduce heat dissipation costs, and reduces the number of power devices used, thus lowering costs, reducing size, and improving the ease of use of the control method for the wireless charging power supply device.

[0122] In one embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps in the above method embodiments.

[0123] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0124] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0125] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0126] To better understand the above embodiments, a detailed explanation is provided below with reference to a specific embodiment. In one embodiment, the wireless charging power supply device includes a wireless charging power supply unit and a main controller. The wireless charging power supply unit includes a filter circuit 100, a DC / AC inverter 200, and a communication module 300. The filter circuit 100 includes an EMC filter circuit 110 and a rectifier filter circuit 120. The EMC filter circuit 110 receives AC input, and the DC / AC inverter 200 is a half-bridge resonant inverter or a full-bridge resonant inverter.

[0127] Alternating current (AC) is transmitted to the EMC filter circuit 110 via a 110V / 220VAC AC input interface (full voltage range: 85VAC-265VAC). The EMC filter circuit 110 is a filter added to meet electromagnetic compatibility regulations regarding radiation and conduction, and includes, but is not limited to, common-mode inductors, differential-mode inductors, X capacitors, and Y capacitors. The rectifier filter circuit 120 rectifies the AC into unidirectional pulsating DC for easier processing by subsequent circuits, and includes, but is not limited to, diodes, rectifier bridges, and capacitors. The DC / AC inverter 200 is a resonant inverter that resonantly inverts the high-voltage pulsating DC into high-frequency AC for easy magnetic coupling to the WPT receiver, while also performing PFC functionality. The resonant inverter topology can be either a half-bridge or a full-bridge resonant inverter; and includes, but is not limited to, transmitting coils, MOSFETs, GaN diodes, and capacitors. The communication module 300 is a circuit that communicates with the WPT receiver, including but not limited to common near-field wireless communication methods such as NFC, 315MHz, 433MHz, and 2.4GHz. Its main function is to enable communication between the WPT transmitter and receiver to form a closed-loop control and other information exchange, such as the transmitter informing the receiver of the load capacity, and the receiver informing the transmitter of the output voltage, current, and other information.

[0128] The control method of the wireless charging power supply device is implemented through a main controller and a drive circuit. The filter circuit 100, DC / AC inverter 200, and communication module 300 are all connected to the main controller, which is also connected to the DC / AC inverter 200 through the drive circuit. The main controller is the core logic control circuit, implemented by a software-programmable digital chip, responsible for the logic control of the entire system. The main controller can be a chip such as an MCU, DSP, or FPGA. In this embodiment, the main controller samples the input voltage information, collecting information about the input AC current, such as amplitude, peak value, phase, and zero-crossing point. The main controller also samples the resonant capacitor voltage or current information, collecting voltage or current information (including but not all required) of the resonant capacitor in the DC / AC inverter 200. The drive circuit is a module that controls the opening and closing of the power switch of the DC / AC inverter 200 (half-bridge or full-bridge). This module can be an independent circuit or integrated into other modules, such as the power switch or the main controller.

[0129] Based on the input voltage sampling information, the resonant capacitor voltage or current sampling information of the DC / AC resonant inverter, and the feedback information of the communication module 300, the main controller outputs control signals through control logic circuits or software algorithms to drive the power switch of the DC / AC resonant inverter WPT power transmission module to operate at high frequency, thereby realizing single-stage wireless charging power transmission while completing the PFC function.

[0130] The specific principles of the control method for wireless charging power supply devices are briefly described below:

[0131] 1. To implement APFC functionality, the AC input current waveform must track the input voltage waveform. This is based on circuit theory. (I represents current, U represents voltage, and Z = R + jX represents impedance) It can be seen that as long as the circuit impedance is purely resistive, that is, the jX component in impedance Z = R + jX is zero, U and I are in phase, meaning the current waveform follows the voltage waveform, and the PF value equals 1, thus achieving APFC functionality. Therefore, as long as the overall input impedance characteristic of the circuit after AC input is controlled by an algorithm to be equivalent to purely resistive, APFC functionality can be achieved.

[0132] 2. As can be seen from the above, taking the half-bridge topology as an example, see... Figure 8 APFC function can be achieved as long as the control algorithm makes the impedance characteristics of the circuit within the outermost black box equivalent to pure resistivity (that is, the overall input impedance of the subsequent circuit as seen from the AC input port is pure resistivity).

[0133] 3. As described in 1 and 2 above, to implement APFC functionality, a control algorithm is used to... Figure 8 Equivalent to Figure 9 That's all.

[0134] The equivalent diagram can realize the ideal APFC function, such that PF = 1 (in reality, it is impossible for it to be perfectly equal to 1, but only close to 1). Assume that the control method of this wireless charging power supply device can realize such an equivalent diagram, that is, it can realize the ideal APFC function, such that PF = 1 (in reality, it is impossible for it to be perfectly equal to 1, but only close to 1).

[0135] Under the assumption that PF = 1, to simplify the formula, the initial phase of the input AC is defined as zero. Then, according to circuit theory, the instantaneous power of the input AC can be expressed as: P ac =2·P RMS sin(θ) 2 .

[0136] Among them, P ac For the input AC instantaneous power, P RMS The input AC active power is θ, which is the instantaneous phase angle of the input AC, i.e., the phase angle information.

[0137] Therefore, as long as the main controller's control algorithm can realize the expression for the instantaneous power of the AC input, the APFC function can be achieved.

[0138] 4. As described in 1, 2, and 3, the implementation of the APFC function is transformed into: controlling the instantaneous power of the AC input to satisfy equation (1). The instantaneous power of the AC input is the power transmitted to the WPT receiver in each switching cycle of the DC / AC inverter. The DC / AC inverter adopts a resonant half-bridge or resonant full-bridge topology. According to the characteristics of this resonant topology, the amount of power transmitted to the WPT receiver in each switching cycle will be reflected in the voltage change of the resonant capacitor in each switching cycle. Therefore, by controlling the change in the voltage of the resonant capacitor, the purpose of controlling the instantaneous power of the AC input can be achieved.

[0139] 5. As described in 4, the implementation of the APFC function is transformed into the control of the resonant capacitor voltage.

[0140] Define the following variables: resonant capacitor capacitance C, DC / AC voltage change of the resonant capacitor over one switching cycle ΔU, and power transferred to the WPT receiver over one switching cycle P. wpt ,

[0141] According to the relevant formula for capacitor energy in circuit theory, we know that:

[0142] Based on points 1, 2, 3, and 4 above, as long as the control algorithm makes P... ac =P wpt This enables APFC functionality.

[0143] Simplifying the equations, we get:

[0144] P RMS The output power of the WPT is proportional to the voltage of the input AC circuit and can be obtained through the communication module 300; θ is the phase angle information of the input AC circuit and can be obtained by sampling the input AC circuit information; C is the resonant capacitor, which is determined after the circuit is built and is a known quantity; the main controller controls the power switches of the half bridge or full bridge to turn on and off according to the information collected above, i.e. the above relationship, and the voltage of the resonant capacitor, so that the difference ΔU of the resonant capacitor voltage within one switching cycle satisfies the relationship, thus realizing the APFC function.

[0145] 6. Based on the above 1-5, the control logic is reorganized as follows:

[0146] The main controller obtains the output information of the WPT receiver, such as the voltage and current information of the receiver, through the communication module 300, and uses it to calculate the input power P required for the AC input. RMS The system collects AC input voltage information, such as phase angle, amplitude, peak value, and zero-crossing point, to track the phase of the AC input voltage. The main controller collects the resonant capacitor voltage and controls the half-bridge or full-bridge power switches based on this voltage, ensuring that the voltage difference ΔU of the resonant capacitor in each switching cycle satisfies the following relationship:

[0147] If the above relationship is satisfied, the impedance characteristic of the entire circuit is purely resistive, and it can be equivalent to a single resistor.

[0148] Since the impedance of the entire circuit can be equivalent to a resistor, the AC input current waveform naturally tracks the AC input voltage waveform, so PF is close to 1, thus completing APFC control.

[0149] 7. The phase angle information of the AC input voltage can be calculated based on the amplitude, instantaneous peak value, zero crossing point and phase of the input voltage, or the phase of the input voltage can be directly tracked and locked by a phase-locked loop.

[0150] 8. The resonant capacitor voltage is the integral of the resonant capacitor current; therefore, the same control effect can be obtained by processing the resonant capacitor current. The amplitude can be calculated based on information such as amplitude, peak value, phase, and zero-crossing point; it is not necessary to collect all of this information.

[0151] The wireless charging power supply device and the control method of the wireless charging power supply apparatus provided in this application reduce the number of power devices used, lower the cost, reduce the number of power conversion stages, save a lot of power devices and magnetic components, reduce the size, reduce the number of power conversion stages, improve efficiency, and help reduce heat dissipation costs and size. It can be directly powered by AC without intermediate power conversion, making it suitable for high-power wireless charging applications.

[0152] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A wireless charging power supply device, characterized in that, It includes a filter circuit, a DC / AC inverter, a main controller, and a communication module. The input terminal of the filter circuit is connected to AC power, and the output terminal is connected to the input terminal of the DC / AC inverter. The main controller is connected to the input terminal of the filter circuit, the DC / AC inverter, and the communication module. The main controller obtains charging feedback information from the wireless power transmission receiver through the communication module, and calculates the input AC active power based on the charging feedback information. Obtain the AC power information connected to the filter circuit; Based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, the change in inverter parameters of the DC / AC inverter is calculated; based on the change in inverter parameters, the power switch in the DC / AC inverter is turned on or off, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity, thereby achieving active power factor correction.

2. The wireless charging power supply device according to claim 1, characterized in that, The accessed AC power information includes phase angle information, the inverter parameters include the capacitance value of the resonant capacitor in the DC / AC inverter, and the main controller is used for: Based on the input AC active power, the phase angle information, and the capacitance value of the resonant capacitor in the DC / AC inverter, the change in the electrical parameters of the resonant capacitor is calculated; the change in the inverter parameters of the DC / AC inverter includes the change in the electrical parameters of the resonant capacitor.

3. The wireless charging power supply device according to claim 2, characterized in that, The main controller is used for: Based on the change in the electrical parameters of the resonant capacitor, the power switch in the DC / AC inverter is controlled to be turned on or off, so that the electrical parameters of the resonant capacitor change according to the change in electrical parameters and operate at the target electrical parameter value; when the resonant capacitor operates at the target electrical parameter value, the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity.

4. The wireless charging power supply device according to claim 2, characterized in that, The main controller is used for: The amplitude, instantaneous peak value, zero-crossing point, and phase of the AC current connected to the filter circuit are obtained; The phase angle information of the connected AC power is calculated based on the amplitude, the instantaneous peak value, the zero crossing point, and the phase.

5. The wireless charging power supply device according to claim 1, characterized in that, The main controller is used for: The instantaneous input AC power is calculated based on the input AC active power and the connected AC power information; Based on the inverter parameters of the DC / AC inverter and the changes in the inverter parameters of the DC / AC inverter, the expression for the output power of the transmitter of the DC / AC inverter is obtained. Based on the relationship between the output power of the transmitter and the instantaneous input AC power, the change in inverter parameters is calculated.

6. The wireless charging power supply device according to claim 1, characterized in that, The device also includes: A drive circuit connected between the main controller and the DC / AC inverter.

7. The wireless charging power supply device according to claim 1, characterized in that, The filtering circuit includes an EMC filtering circuit and a rectifier filtering circuit. One side of the EMC filtering circuit is connected to AC power, and the other side is connected to the rectifier filtering circuit, which is connected to the DC / AC inverter.

8. The wireless charging power supply device according to claim 1, characterized in that, The device also includes: An AC power information acquisition module connected between the main controller and the input terminal of the filter circuit is used to acquire AC power information connected to the filter circuit.

9. The wireless charging power supply device according to claim 1, characterized in that, The device also includes: A voltage acquisition module and / or a current acquisition module are connected between the main controller and the output terminal of the DC / AC inverter; The voltage acquisition module is used to acquire the voltage of the DC / AC inverter; The current acquisition module is used to acquire the current of the DC / AC inverter.

10. A control method for a wireless charging power supply device, characterized in that, The wireless charging power supply device includes a filter circuit and a DC / AC inverter. One side of the filter circuit is connected to AC power, and the other side is connected to the DC / AC inverter. The control method includes the following steps: Obtain charging feedback information from the wireless power transmission receiver and calculate the input AC active power based on the charging feedback information; Obtain the AC power information connected to the filter circuit; Based on the input AC active power, the connected AC power information, and the inverter parameters of the DC / AC inverter, calculate the change in inverter parameters of the DC / AC inverter; The power switch in the DC / AC inverter is turned on or off according to the change in the inverter parameters, so that the circuit input impedance characteristics of the filter circuit and the DC / AC inverter are equivalent to pure resistivity, thereby achieving active power factor correction.

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