Wireless charging circuit, wireless charging method and computer readable storage medium

Abstract

The present invention discloses a wireless charging circuit, including: a primary circuit and a secondary circuit. The present invention also discloses a wireless charging method and a computer-readable storage medium. The present invention controls the primary full-bridge circuit through a control module, which can improve the frequency accuracy of the primary full-bridge circuit and reduce the frequency operation error range of the primary full-bridge circuit. When charging an electric vehicle, the primary circuit is operated at a preset frequency because the frequency operation error range is small, and the frequency of the primary circuit is captured by a capture module. The operating state of the secondary circuit is controlled according to the acquired primary frequency, so that the frequency of the primary circuit is the same or similar to the frequency of the secondary circuit, thereby improving the charging efficiency and system stability of the wireless charging circuit.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging technology, and in particular to a wireless charging circuit, a wireless charging method and a computer-readable storage medium. Background Art

[0002] Wireless charging technology has been gradually popularized in the field of electric vehicles. In engineering applications, the position between ground equipment and on-board equipment is uncertain depending on the parking state, and the chassis of the vehicle will also change within a certain range depending on the load state in the vehicle. As a result, the horizontal offset distance and vertical distance (ground clearance) between the primary and secondary coils of the wireless charging system will change within a certain range; and during the entire process of car charging, the demand for charging voltage / current changes dynamically, so the wireless charging system needs to adjust the output voltage / current of the output system according to the charging voltage / current value requirements of the car.

[0003] In order to solve the above engineering problems, multi-level control (such as controlled rectification scheme, etc.) is usually adopted on the primary and secondary sides. However, this method needs to ensure that the frequencies of the primary and secondary sides are the same or similar (combined with other algorithms to achieve overall control). Otherwise, it will affect the stability of the system and the charging efficiency of the system.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a wireless charging circuit, a wireless charging method and a computer-readable storage medium, aiming to solve the technical problem that it is difficult to ensure that the frequencies of the primary side and the secondary side are the same or similar when charging an existing automobile, thereby affecting the system stability and the system charging efficiency.

[0006] To achieve the above object, the present invention provides a wireless charging circuit, comprising: a primary circuit and a secondary circuit;

[0007] The primary circuit comprises:

[0008] A primary full-bridge circuit, wherein an input end of the primary full-bridge circuit is electrically connected to a DC power supply;

[0009] A first charging circuit, the first charging circuit is electrically connected to the output end of the primary full-bridge circuit; a control module, the control module is a control chip of the primary full-bridge circuit, and controls the on and off of the switch tube of the primary full-bridge circuit;

[0010] The secondary circuit comprises:

[0011] a second charging circuit;

[0012] a secondary full-bridge circuit, wherein an input end of the secondary full-bridge circuit is electrically connected to the second charging circuit, and the secondary full-bridge circuit is electrically connected to a load;

[0013] A capture module, wherein the capture module is electrically connected to the second charging circuit and / or the secondary full-bridge circuit to obtain a primary frequency of the primary circuit and control the wireless charging circuit according to the primary frequency.

[0014] Further, the primary full-bridge circuit includes a first primary switch unit, a second primary switch unit, a third primary switch unit and a fourth primary switch unit;

[0015] The first primary switch unit and the third primary switch unit are connected in series to form a first branch, the second primary switch unit and the fourth primary switch unit are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to form the primary full-bridge circuit;

[0016] A first connection point between the first primary switch unit and the second primary switch unit, and a second connection point between the third primary switch unit and the fourth primary switch unit, are electrically connected to the DC power supply respectively;

[0017] A third connection point between the first primary switch unit and the third primary switch unit, and a fourth connection point between the second primary switch unit and the fourth primary switch unit, are electrically connected to the first charging circuit, respectively.

[0018] Further, the secondary full-bridge circuit includes a first secondary switch unit, a second secondary switch unit, a third secondary switch unit and a fourth secondary switch unit;

[0019] The first secondary switch unit and the third secondary switch unit are connected in series to form a third branch, the second secondary switch unit and the fourth secondary switch unit are connected in series to form a fourth branch, and the third branch and the fourth branch are connected in parallel to form the secondary full-bridge circuit;

[0020] A fifth connection point between the first secondary switch unit and the second secondary switch unit, and a sixth connection point between the third secondary switch unit and the fourth secondary switch unit, are electrically connected to the load respectively;

[0021] A seventh connection point between the first secondary switch unit and the third secondary switch unit, and an eighth connection point between the second secondary switch unit and the fourth secondary switch unit are electrically connected to the second charging circuit, respectively.

[0022] In addition, to achieve the above object, the present invention further provides a wireless charging method, which is applied to the aforementioned wireless charging circuit, and the wireless charging method comprises the following steps:

[0023] If the primary circuit operates at a preset frequency, the secondary circuit obtains the primary frequency of the primary circuit through the capture module;

[0024] Determining whether the acquired primary frequency is within a preset frequency range;

[0025] If the acquired primary frequency is outside the preset frequency range, a charging protection function corresponding to the wireless charging circuit is started, or the wireless charging circuit is controlled to stop the charging operation.

[0026] Furthermore, before the wireless charging circuit starts charging, if the primary circuit operates at a preset frequency, the secondary circuit acquires the primary frequency of the primary circuit through a capture module, including:

[0027] If the primary circuit operates the preset frequency in a high-precision mode, and the secondary circuit operates in a secondary full-bridge short-circuit operating mode, or an uncontrolled rectification operating mode, or a synchronous rectification operating mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information;

[0028] After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes:

[0029] If the acquired primary frequency is within the preset frequency range, the primary circuit maintains the primary frequency and operates in a high-precision mode during the charging process, and the secondary circuit maintains the acquired primary frequency and operates in a high-precision mode.

[0030] Furthermore, before the wireless charging circuit starts charging and / or during charging, if the primary circuit operates at a preset frequency, the step of acquiring the primary frequency of the primary circuit by the capture module includes:

[0031] The secondary circuit detects the amount of information reflecting the primary frequency through the capture module, and obtains the primary frequency corresponding to the primary circuit in real time based on the amount of information;

[0032] After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

[0033] Furthermore, before the wireless charging circuit starts charging and / or during charging, if the primary circuit operates at a preset frequency, the step of acquiring the primary frequency of the primary circuit by the capture module includes:

[0034] If the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information in real time;

[0035] After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

[0036] Furthermore, before the wireless charging circuit starts charging, if the primary circuit operates at a preset frequency, the step of the secondary circuit acquiring the primary frequency of the primary circuit includes:

[0037] If the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit obtains the primary frequency sent by the primary circuit through wireless communication;

[0038] The secondary circuit operates at the obtained primary frequency.

[0039] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, on which a wireless charging program is stored, and when the wireless charging program is executed by a processor, the steps of the aforementioned wireless charging method are implemented.

[0040] The present invention controls the primary full-bridge circuit through a control module, which can improve the frequency accuracy of the primary full-bridge circuit and reduce the operating error range of the frequency of the primary full-bridge circuit. When charging an electric vehicle, the primary circuit is operated at a preset frequency because the operating error range is small, and the frequency of the primary circuit is captured by a capture module. The operating state of the secondary circuit is controlled according to the acquired primary frequency, so that the frequency of the primary circuit is the same as or close to the frequency of the secondary circuit, thereby improving the charging efficiency and system stability of the wireless charging circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of an embodiment of a wireless charging circuit of the present invention;

[0042] Figure 2 FIG. 1 is a flow chart of a first embodiment of a wireless charging method according to the present invention.

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0045] The present invention provides a wireless charging circuit. Figure 1 , Figure 1 FIG. 1 is a schematic structural diagram of an embodiment of a wireless charging circuit of the present invention.

[0046] In this embodiment, the wireless charging circuit includes a primary circuit and a secondary circuit.

[0047] The primary circuit includes: a primary full-bridge circuit, a first charging circuit and a control module. The primary circuit can be applied to an electric vehicle wireless charging pile, which is connected to a current power supply, converts the current power supply into a DC power supply and is electrically connected to the primary full-bridge circuit.

[0048] The input end of the primary full-bridge circuit is electrically connected to a DC power supply; the first charging circuit is electrically connected to the output end of the primary full-bridge circuit; the control module is electrically connected to the primary full-bridge circuit, and the control module is a control chip of the primary full-bridge circuit, which controls the on and off of the switch tube of the primary full-bridge circuit.

[0049] Furthermore, in one embodiment, the primary full-bridge circuit includes a first primary switch unit Qp1, a second primary switch unit Qp2, a third primary switch unit Qp3 and a fourth primary switch unit Qp4; the first primary switch unit Qp1 and the third primary switch unit Qp3 are connected in series to form a first branch, the second primary switch unit Qp2 and the fourth primary switch unit Qp4 are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to form the primary full-bridge circuit.

[0050] The first connection point of the first primary switch unit Qp1 and the second primary switch unit Qp2, and the second connection point of the third primary switch unit Qp3 and the fourth primary switch unit Qp4 are electrically connected to the DC power supply respectively; preferably, referring to Figure 1 The first connection point is electrically connected to the positive electrode of the DC power supply, and the second connection point is electrically connected to the negative electrode of the DC power supply.

[0051] A third connection point between the first primary switch unit Qp1 and the third primary switch unit Qp3 , and a fourth connection point between the second primary switch unit Qp2 and the fourth primary switch unit Qp4 , are electrically connected to the first charging circuit, respectively.

[0052] Preferably, the first primary switch unit Qp1, the second primary switch unit Qp2, the third primary switch unit Qp3 and the fourth primary switch unit Qp4 can all be MOSFET (Metal-Oxide-Semiconductor Field-EffectTransIstor, metal oxide semiconductor field effect transistor) / MOS tube, such as super junction MOSFET, or SiC-MOSFET, or the first primary switch unit Qp1, the second primary switch unit Qp2, the third primary switch unit Qp3 and the fourth primary switch unit Qp4 can also be other switch tubes such as IGBT tube (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor).

[0053] Further, in another embodiment, the control module is electrically connected to the first primary switch unit Qp1, the second primary switch unit Qp2, the third primary switch unit Qp3 and the fourth primary switch unit Qp4 respectively. The control module can control the first primary switch unit Qp1, the second primary switch unit Qp2, the third primary switch unit Qp3 and the fourth primary switch unit Qp4 according to the fixed switching frequency f0, that is, the first primary switch unit Qp1, the second primary switch unit Qp2, the third primary switch unit Qp3 and the fourth primary switch unit Qp4 are controlled to be turned on and off according to the fixed switching frequency f0.

[0054] The control module in this embodiment can be a high-precision control module, which can be a module integrated inside a high-precision control chip, or can be implemented by a common control chip + other high-precision circuits or high-precision control algorithms, so that the primary circuit is in a high-precision mode: that is, a function with high time accuracy, usually the time accuracy is controlled within a few hundred ps, and only with high time accuracy can high frequency accuracy be achieved. High-precision control chips such as TI's 280x, 2833x and other series chips have an internally integrated HRPWM (High-Resolution Pulse Width Modulator) function, which expands the time accuracy of conventional digital pulse width modulators (PWM), and usually the time step is about 150ps. In the area near the common frequency of wireless charging 85kHz, the step time accuracy means that the frequency accuracy is no more than 2Hz, that is, the frequency of the primary circuit is in the range of 85.002kHz to 84.998kHz.

[0055] Furthermore, in another embodiment, the first charging circuit includes: a first primary capacitor C1, a second primary capacitor Cp, a first primary inductor L1 and a second primary inductor Lp; the first primary inductor L1, the second primary capacitor Cp and the second primary inductor Lp are sequentially connected in series to form a first series circuit, one end of the first series circuit is electrically connected to the third connection point, and the other end is electrically connected to the fourth connection point; one end of the first primary capacitor C1 is electrically connected to the fourth connection point, and the other end is connected to the connection between the first primary inductor L1 and the second primary capacitor Cp.

[0056] In this embodiment, the primary full-bridge circuit converts the direct current Vdc into a high-frequency current at a fixed switching frequency f0, and converts the electrical energy into magnetic energy through the second primary inductor Lp of the loosely coupled transformer.

[0057] The secondary circuit includes: a second charging circuit, a secondary full-bridge circuit, and a capture module. The secondary circuit is adapted to the primary circuit.

[0058] An input end of the secondary full-bridge circuit is electrically connected to the second charging circuit, and the secondary full-bridge circuit is electrically connected to a load R.

[0059] The capture module is electrically connected to the second charging circuit and / or the secondary full-bridge circuit to obtain the primary frequency of the primary circuit, and controls the secondary circuit according to the obtained primary frequency.

[0060] The capture module has a high-resolution frequency or duty cycle measurement function and can perform instantaneous frequency measurement. The capture module can be a high-precision capture module, which can be a module integrated inside a high-precision capture chip, or can be implemented by a common capture chip + other high-precision circuits or high-precision control algorithms. For example, a high-precision capture chip can be TI's 28035, 28069 and other chips, and the internal function name is -HRCAP (High-ResolutionCapture, which can usually measure the external pulse width at a typical resolution within hundreds of picoseconds).

[0061] Furthermore, the secondary full-bridge circuit includes a first secondary switch unit Qs1, a second secondary switch unit Qs2, a third secondary switch unit Qs3 and a fourth secondary switch unit Qs4.

[0062] The first secondary switch unit Qs1 and the third secondary switch unit Qs3 are connected in series to form a third branch, the second secondary switch unit Qs2 and the fourth secondary switch unit Qs4 are connected in series to form a fourth branch, and the third branch and the fourth branch are connected in parallel to form the secondary full-bridge circuit;

[0063] A fifth connection point between the first secondary switch unit Qs1 and the second secondary switch unit Qs2, and a sixth connection point between the third secondary switch unit Qs3 and the fourth secondary switch unit Qs4, are electrically connected to the load, respectively;

[0064] A seventh connection point between the first secondary switch unit Qs1 and the third secondary switch unit Qs3 and an eighth connection point between the second secondary switch unit Qs2 and the fourth secondary switch unit Qs4 are electrically connected to the second charging circuit, respectively.

[0065] The first secondary switch unit Qs1, the second secondary switch unit Qs2, the third secondary switch unit Qs3 and the fourth secondary switch unit Qs4 can all be MOSFET (Metal-Oxide-Semiconductor Field-Effect TransIstor, metal oxide semiconductor field effect transistor) / MOS tubes, such as super junction MOSFET, or SiC-MOSFET, or the first secondary switch unit Qs1, the second secondary switch unit Qs2, the third secondary switch unit Qs3 and the fourth secondary switch unit Qs4 can also be other switch tubes such as IGBT.

[0066] Furthermore, the secondary circuit also includes a third secondary capacitor Co; one end of the third secondary capacitor Co is electrically connected to the fifth connection point, and the other end is electrically connected to the sixth connection point to stabilize the output signal of the secondary full-bridge circuit.

[0067] Further, the second charging circuit includes: a first secondary capacitor C2, a second secondary capacitor Cs, a first secondary inductor L2 and a second secondary inductor Ls; the first secondary inductor L2, the second secondary capacitor Cs and the second secondary inductor Ls are connected in series in sequence to form a second series circuit, one end of the second series circuit is electrically connected to the seventh connection point, and the other end is electrically connected to the eighth connection point; one end of the first secondary capacitor C2 is electrically connected to the eighth connection point, and the other end is connected to the connection between the first secondary inductor L2 and the second secondary capacitor Cs.

[0068] Among them, the first primary capacitor C1, the second primary capacitor Cp, and the first primary inductor L1 together form a system primary compensation network, and the first secondary capacitor C2, the second secondary capacitor Cs, and the first secondary inductor L2 together form a system secondary compensation network. Of course, the compensation network applicable to this embodiment is not limited to this. The compensation network can be a single device form such as a series compensation capacitor or a parallel compensation capacitor, or it can be a combination mode composed of a compensation capacitor and a compensation inductor. For example, in addition to the LCC compensation network in the example, there are other multi-device combination modes such as LCL.

[0069] In addition, the second primary inductor Lp is a primary coil, which is usually placed on the ground in engineering applications; the second secondary inductor Ls is a secondary coil, which is usually placed on the vehicle in engineering applications. The primary coil Lp and the secondary coil Ls form a loosely coupled transformer to achieve energy transmission and reception. The shapes of the two are not limited, and can be circular coils, rectangular coils, D-shaped coils, etc.

[0070] In this embodiment, the secondary circuit is described by taking the full-bridge circuit as an example, which does not mean that there is only this form. In practical applications, other equivalent circuit topologies with two switching tubes and two diodes (for example, the two upper tubes of the full bridge are diodes and the two lower tubes are switching tubes, or one arm of the full bridge is a diode and the other arm is a switching tube, etc.) are still applicable, and the working principle is the same, which will not be repeated here.

[0071] The capture module is used to capture the frequency of the primary circuit through the second charging circuit and / or the secondary full-bridge circuit, and to control the secondary full-bridge circuit according to the acquired frequency. For example, if the acquired frequency is outside the preset frequency range, the charging protection function corresponding to the wireless charging circuit is activated, or the wireless charging circuit is controlled to stop the charging operation; if the acquired frequency is within the preset frequency range, charging continues, so as to ensure that the frequencies of the primary side and the secondary side are the same or similar.

[0072] The wireless charging circuit in this embodiment controls the primary full-bridge circuit through the control module, which can improve the frequency accuracy of the primary full-bridge circuit and reduce the operating error range of the frequency of the primary full-bridge circuit. When charging the electric vehicle, the primary circuit is operated at a preset frequency because the operating error range is small, and the frequency of the primary circuit is captured by the capture module. The operating state of the secondary circuit is controlled according to the acquired frequency of the primary circuit, so that the frequency of the primary circuit is the same as or close to the frequency of the secondary circuit, thereby improving the charging efficiency and system stability of the wireless charging circuit.

[0073] The present invention also provides a wireless charging method, referring to Figure 2 , Figure 2 Schematic diagram of the process of the first embodiment of the method of the present invention.

[0074] The wireless charging method is applied to the above-mentioned wireless charging circuit, and the wireless charging method comprises the following steps:

[0075] Step S100, if the primary circuit operates at a preset frequency, the secondary circuit acquires the primary frequency corresponding to the primary circuit through a capture module;

[0076] In this embodiment, when the electric vehicle is charging, the primary circuit operates at a preset frequency, and the secondary circuit obtains the primary frequency of the primary circuit through a capture module. Specifically, the primary frequency can be obtained by detecting the amount of information reflecting the primary frequency through the second charging circuit and / or the secondary full-bridge circuit.

[0077] Step S200, determining whether the acquired primary frequency is within a preset frequency range;

[0078] Step S300: If the acquired primary frequency is outside the preset frequency range, a charging protection function corresponding to the wireless charging circuit is activated, or the wireless charging circuit is controlled to stop the charging operation.

[0079] In this embodiment, when the primary frequency is obtained, the secondary circuit determines whether the obtained primary frequency is within a preset frequency range. If the obtained primary frequency is outside the preset frequency range, the charging protection function corresponding to the wireless charging circuit is started, or the wireless charging circuit is controlled to stop the charging operation. If the primary frequency is within the preset frequency range, the charging operation continues.

[0080] It should be noted that if the acquired primary frequency is within a preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process, so that the electric vehicle can be charged quickly and efficiently.

[0081] The wireless charging method proposed in this embodiment is as follows: if the primary circuit operates at a preset frequency, the secondary circuit obtains the primary frequency of the primary circuit through a capture module; then determines whether the obtained primary frequency is within a preset frequency range; and then if the obtained primary frequency is outside the preset frequency range, starts a charging protection function corresponding to the wireless charging circuit, or controls the wireless charging circuit to stop the charging operation, determines whether to continue charging according to the obtained primary frequency, and then controls the operation of the secondary circuit according to the obtained primary frequency, ensures that the frequency of the primary circuit is the same as or close to the frequency of the secondary circuit, and improves the charging efficiency and system stability of the wireless charging circuit.

[0082] Based on the first embodiment, a second embodiment of the wireless charging method of the present invention is proposed. In this embodiment, before the wireless charging circuit starts charging, step S100 includes:

[0083] Step S110, if the primary circuit operates the preset frequency in a high-precision mode, and the secondary circuit operates in a secondary full-bridge short-circuit operating mode, or an uncontrolled rectification operating mode, or a synchronous rectification operating mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information;

[0084] In this embodiment, when the primary circuit operates at a preset frequency, if the primary circuit operates at the preset frequency in a high-precision mode, the secondary circuit can operate in a secondary full-bridge short-circuit operating mode, or an uncontrolled rectification operating mode or a synchronous rectification operating mode.

[0085] Among them, the secondary full-bridge short-circuit working mode: that is, the secondary full-bridge short-circuits the corresponding MOS tube through control methods such as adjusting the duty cycle or phase shifting, so that the mid-point voltage Ve of the full bridge is 0.

[0086] Uncontrolled rectifier working mode: that is, turn off all MOS tube drivers on the secondary side of the full bridge, and only the diode works. At this time, the full bridge is equivalent to an uncontrolled rectifier bridge.

[0087] Synchronous rectification working mode: The operation of synchronous rectification is similar to that of uncontrolled rectification, except that in uncontrolled rectification the current flows through the diode, while in synchronous rectification the current flows through the MOS tube itself.

[0088] If the secondary full-bridge circuit operates in a secondary full-bridge short-circuit working mode, or an uncontrolled rectification working mode or a synchronous rectification working mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information. Specifically, when the amount of information is obtained, the waveform frequency of the information is determined, and the waveform frequency is used as the obtained primary frequency.

[0089] The information includes at least one of the input current Ie of the secondary full-bridge circuit, the inductor current Is of the second secondary inductor Ls in the second charging circuit, and the voltage across the second secondary capacitor Cs in the second charging circuit. The frequencies of the input current Ie of the secondary full-bridge circuit, the inductor current Is of the second secondary inductor Ls, and the voltage across the second secondary capacitor Cs include the primary frequency f0, and the capture module can be used to obtain relatively accurate primary frequency information.

[0090] After step S200, the method further includes:

[0091] Step S400: If the acquired primary frequency is within the preset frequency range, the primary circuit maintains the primary frequency and operates in a high-precision mode during the charging process, and the secondary circuit maintains the acquired primary frequency and operates in a high-precision mode.

[0092] In this embodiment, if the acquired primary frequency is within a preset frequency range, the primary circuit maintains the primary frequency in a high-precision mode during the charging process, and the secondary circuit maintains the acquired primary frequency in a high-precision mode, so that the electric vehicle can be charged quickly and efficiently.

[0093] The wireless charging method proposed in this embodiment is as follows: if the primary circuit operates the preset frequency in a high-precision mode, and the secondary circuit operates in a secondary full-bridge short-circuit working mode, or an uncontrolled rectification working mode or a synchronous rectification working mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information; then, if the obtained primary frequency is within a preset frequency range, the primary circuit maintains the primary frequency to operate in a high-precision mode during the charging process, and the secondary circuit maintains the obtained primary frequency to operate in a high-precision mode, and controls the operating state of the secondary circuit according to the obtained primary frequency to ensure that the frequency of the primary circuit is the same as or close to the frequency of the secondary circuit, thereby improving the charging efficiency and system stability of the wireless charging circuit.

[0094] Based on the first embodiment, a third embodiment of the wireless charging method of the present invention is proposed. In this embodiment, before the wireless charging circuit starts charging and / or during charging, step S100 includes:

[0095] Step S120: If the primary circuit runs the preset frequency, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and acquires the primary frequency corresponding to the primary circuit based on the amount of information in real time.

[0096] After step S200, the method further includes:

[0097] Step S500: If the acquired primary frequency is within a preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

[0098] In this embodiment, the primary circuit operates at a preset frequency, and the secondary circuit detects the amount of information reflecting the primary frequency in real time through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information in real time. Specifically, when the amount of information is obtained, the waveform frequency of the information is determined, and the waveform frequency is used as the primary frequency. The amount of information includes at least one of the input current Ie of the secondary full-bridge circuit, the inductor current Is of the second secondary inductor Ls in the second charging circuit, and the voltage across the second secondary capacitor Cs in the second charging circuit. The frequency of the input current Ie of the secondary full-bridge circuit, the inductor current Is of the second secondary inductor Ls, and the voltage across the second secondary capacitor Cs is the primary frequency f0. The capture module can be used to obtain relatively accurate primary frequency information.

[0099] If the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process, so that the primary circuit and the secondary circuit maintain the same or similar frequency operation, so that the electric vehicle can be charged quickly and efficiently.

[0100] The wireless charging method proposed in this embodiment detects the amount of information reflecting the primary frequency through the capture module of the secondary circuit, and obtains the primary frequency corresponding to the primary circuit based on the information in real time. Then, if the acquired primary frequency is within a preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process. By controlling the operating state of the secondary circuit in real time according to the acquired primary frequency, it is possible to ensure in real time that the frequency of the primary circuit is the same as or close to the frequency of the secondary circuit, thereby further improving the charging efficiency and system stability of the wireless charging circuit.

[0101] Based on the first embodiment, a fourth embodiment of the wireless charging method of the present invention is proposed. In this embodiment, before the wireless charging circuit starts charging and / or during charging, step S100 includes:

[0102] Step S130, if the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and acquires the primary frequency corresponding to the primary circuit based on the amount of information in real time;

[0103] After step S200, the method further includes:

[0104] Step S600: If the acquired primary frequency is within a preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

[0105] In this embodiment, when the primary circuit operates at a preset frequency, if the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit detects the amount of information reflecting the primary frequency in real time through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information in real time. Specifically, when the amount of information is obtained, the waveform frequency of the information is determined, and the waveform frequency is used as the primary frequency. The amount of information includes at least one of the input current Ie of the secondary full-bridge circuit, the inductor current Is of the second secondary inductor Ls in the second charging circuit, and the voltage across the second secondary capacitor Cs in the second charging circuit. The frequency of the input current Ie of the secondary full-bridge circuit, the inductor current Is of the second secondary inductor Ls, and the voltage across the second secondary capacitor Cs is the primary frequency f0. The capture module can be used to obtain relatively accurate primary frequency information.

[0106] If the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process, so that the primary circuit and the secondary circuit operate at the same or similar frequencies, so that the electric vehicle can be charged quickly and efficiently.

[0107] The wireless charging method proposed in this embodiment is that if the primary circuit adopts the high-precision mode to operate the preset frequency, the secondary circuit detects the amount of information reflecting the primary frequency through the capture module, and obtains the primary frequency corresponding to the primary circuit based on the information in real time. Then, if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process. By controlling the operating state of the secondary circuit in real time according to the acquired primary frequency, it is possible to ensure in real time that the frequency of the primary circuit is the same as or close to the frequency of the secondary circuit, thereby further improving the charging efficiency and system stability of the wireless charging circuit.

[0108] Based on the first embodiment, a fifth embodiment of the wireless charging method of the present invention is proposed. In this embodiment, before the wireless charging circuit starts charging, step S100 includes:

[0109] Step S140, if the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit acquires the primary frequency sent by the primary circuit through wireless communication;

[0110] Step S150: the secondary circuit operates at the obtained primary frequency.

[0111] In this embodiment, the primary circuit can communicate with the secondary circuit, and the primary circuit sends the primary frequency to the secondary circuit. When the primary frequency is received, the secondary circuit operates according to the obtained primary frequency, so that the primary circuit and the secondary circuit operate at the same frequency.

[0112] The wireless charging method proposed in this embodiment is that if the primary circuit adopts the high-precision mode to operate the preset frequency, the secondary circuit obtains the primary frequency sent by the primary circuit through wireless communication; then the secondary circuit adopts the high-precision mode to operate according to the obtained primary frequency, and through the wireless communication interaction between the primary circuit and the secondary circuit, the secondary circuit operates according to the received primary frequency, thereby ensuring that the frequency of the primary circuit is the same as the frequency of the secondary circuit, further improving the charging efficiency and system stability of the wireless charging circuit.

[0113] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a wireless charging program is stored. When the wireless charging program is executed by a processor, the following operations are implemented:

[0114] If the primary circuit operates at a preset frequency, the secondary circuit obtains the primary frequency of the primary circuit through the capture module;

[0115] Determining whether the acquired primary frequency is within a preset frequency range;

[0116] If the acquired primary frequency is outside the preset frequency range, a charging protection function corresponding to the wireless charging circuit is started, or the wireless charging circuit is controlled to stop the charging operation.

[0117] Furthermore, when the wireless charging program is executed by the processor, the following operations are also implemented:

[0118] If the primary circuit operates the preset frequency in a high-precision mode, and the secondary circuit operates in a secondary full-bridge short-circuit operating mode, or an uncontrolled rectification operating mode, or a synchronous rectification operating mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information;

[0119] After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes:

[0120] If the acquired primary frequency is within the preset frequency range, the primary circuit maintains the primary frequency and operates in a high-precision mode during the charging process, and the secondary circuit maintains the acquired primary frequency and operates in a high-precision mode.

[0121] Furthermore, when the wireless charging program is executed by the processor, the following operations are also implemented:

[0122] If the primary circuit runs the preset frequency, the secondary circuit detects the amount of information reflecting the primary frequency through the capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information in real time;

[0123] After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

[0124] Furthermore, when the wireless charging program is executed by the processor, the following operations are also implemented:

[0125] If the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information in real time;

[0126] After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

[0127] Furthermore, when the wireless charging program is executed by the processor, the following operations are also implemented:

[0128] If the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit acquires the primary frequency sent by the primary circuit through wireless communication;

[0129] The secondary circuit operates at the obtained primary frequency.

[0130] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0131] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0132] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0133] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wireless charging circuit, characterized in that: include: Primary circuit and secondary circuit; The primary circuit comprises: A primary full-bridge circuit, wherein an input end of the primary full-bridge circuit is electrically connected to a DC power supply; a first charging circuit, the first charging circuit being electrically connected to an output end of the primary full-bridge circuit; A control module, which is a control chip of the primary full-bridge circuit and controls the on and off of the switch tube of the primary full-bridge circuit; The secondary circuit comprises: a second charging circuit; a secondary full-bridge circuit, wherein an input end of the secondary full-bridge circuit is electrically connected to the second charging circuit, and the secondary full-bridge circuit is electrically connected to a load; a capture module, the capture module being electrically connected to the second charging circuit and / or the secondary full-bridge circuit to obtain a primary frequency of the primary circuit and controlling the secondary circuit according to the obtained primary frequency; Wherein, the primary full-bridge circuit includes a first primary switch unit, a second primary switch unit, a third primary switch unit and a fourth primary switch unit; the first charging circuit includes: a first primary capacitor C1, a second primary capacitor Cp, a first primary inductor L1 and a second primary inductor Lp; the first primary inductor L1, the second primary capacitor Cp and the second primary inductor Lp are sequentially connected in series to form a first series circuit, one end of the first series circuit is electrically connected to a third connection point between the first primary switch unit and the third primary switch unit, and the other end is electrically connected to a fourth connection point between the second primary switch unit and the fourth primary switch unit; one end of the first primary capacitor C1 is electrically connected to the fourth connection point, and the other end is connected to the connection between the first primary inductor L1 and the second primary capacitor Cp; The secondary full-bridge circuit includes a first secondary switch unit, a second secondary switch unit, a third secondary switch unit and a fourth secondary switch unit; the second charging circuit includes: a first secondary capacitor C2, a second secondary capacitor Cs, a first secondary inductor L2 and a second secondary inductor Ls; the first secondary inductor L2, the second secondary capacitor Cs and the second secondary inductor Ls are sequentially connected in series to form a second series circuit, one end of the second series circuit is electrically connected to the seventh connection point between the first secondary switch unit and the third secondary switch unit, and the other end is electrically connected to the eighth connection point between the second secondary switch unit and the fourth secondary switch unit; one end of the first secondary capacitor C2 is electrically connected to the eighth connection point, and the other end is connected to the connection between the first secondary inductor L2 and the second secondary capacitor Cs.

2. The wireless charging circuit according to claim 1, characterized in that: The first primary switch unit and the third primary switch unit are connected in series to form a first branch, the second primary switch unit and the fourth primary switch unit are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to form the primary full-bridge circuit; A first connection point between the first primary switch unit and the second primary switch unit, and a second connection point between the third primary switch unit and the fourth primary switch unit, are electrically connected to the DC power supply respectively; The third connection point and the fourth connection point are electrically connected to the first charging circuit respectively.

3. The wireless charging circuit according to claim 2, characterized in that: The first secondary switch unit and the third secondary switch unit are connected in series to form a third branch, the second secondary switch unit and the fourth secondary switch unit are connected in series to form a fourth branch, and the third branch and the fourth branch are connected in parallel to form the secondary full-bridge circuit; A fifth connection point between the first secondary switch unit and the second secondary switch unit, and a sixth connection point between the third secondary switch unit and the fourth secondary switch unit, are electrically connected to the load respectively; The seventh connection point and the eighth connection point are electrically connected to the second charging circuit respectively.

4. A wireless charging method, characterized in that: The wireless charging method is applied to the wireless charging circuit according to any one of claims 1 to 3, and the wireless charging method comprises the following steps: If the primary circuit operates at a preset frequency, the secondary circuit obtains the primary frequency of the primary circuit through the capture module; Determining whether the acquired primary frequency is within a preset frequency range; If the acquired primary frequency is outside the preset frequency range, a charging protection function corresponding to the wireless charging circuit is started, or the wireless charging circuit is controlled to stop the charging operation.

5. The wireless charging method according to claim 4, characterized in that: Before the wireless charging circuit starts charging, if the primary circuit operates at a preset frequency, the secondary circuit acquires the primary frequency of the primary circuit through a capture module, including: If the primary circuit operates the preset frequency in a high-precision mode, and the secondary circuit operates in a secondary full-bridge short-circuit operating mode, or an uncontrolled rectification operating mode, or a synchronous rectification operating mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and obtains the primary frequency corresponding to the primary circuit based on the amount of information; After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: If the acquired primary frequency is within the preset frequency range, the primary circuit maintains the primary frequency and operates in a high-precision mode during the charging process.

6. The wireless charging method according to claim 4, characterized in that: Before the wireless charging circuit starts charging and / or during charging, if the primary circuit operates at a preset frequency, the step of acquiring the primary frequency of the primary circuit by a capture module includes: The secondary circuit detects the amount of information reflecting the primary frequency through the capture module, and obtains the primary frequency corresponding to the primary circuit in real time based on the amount of information; After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

7. The wireless charging method according to claim 4, wherein: Before the wireless charging circuit starts charging and / or during charging, if the primary circuit operates at a preset frequency, the step of acquiring the primary frequency of the primary circuit by a capture module includes: If the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit detects the amount of information reflecting the primary frequency through a capture module, and acquires the primary frequency corresponding to the primary circuit based on the amount of information in real time; After the step of determining whether the acquired primary frequency is within the preset frequency range, the method further includes: if the acquired primary frequency is within the preset frequency range, the secondary circuit operates according to the acquired primary frequency during the charging process.

8. The wireless charging method according to claim 4, wherein: Before the wireless charging circuit starts charging, if the primary circuit operates at a preset frequency, the step of the secondary circuit acquiring the primary frequency of the primary circuit includes: If the primary circuit operates the preset frequency in a high-precision mode, the secondary circuit obtains the primary frequency sent by the primary circuit through wireless communication; The secondary circuit operates at the obtained primary frequency.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a wireless charging program, and when the wireless charging program is executed by the processor, the steps of the wireless charging method according to any one of claims 4 to 8 are implemented.

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