Modulation method and device of wireless charging system and wireless charging system

Abstract

The invention provides a modulation method and device of a wireless charging system and the wireless charging system, and relates to the technical field of wireless charging, and the method comprises the steps: responding to the starting of the wireless charging system, controlling a rectification circuit to operate according to a pre-configured rectification logic, and carrying out the rectification processing of the energy obtained through the coupling of a receiving end coil; monitoring the operation state of the lower MOS tube in the operation process of the rectification circuit; if it is monitored that the running state of the lower MOS tube is switched from the on state to the off state, the lower MOS tube is controlled to be turned off in a delayed mode according to a pre-configured delay turn-off parameter. According to the modulation method and device of the wireless charging system and the wireless charging system, delay turn-off of the MOS transistor can be controlled according to the pre-configured delay turn-off parameter, so that communication modulation is realized at the receiving end, additional material cost does not need to be increased in the whole modulation process, the adjustment flexibility of the modulation depth is also improved, and the modulation efficiency is improved. And diversified application requirements can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a modulation method and device of a wireless charging system and a wireless charging system. Background Art

[0002] In the field of wireless charging, in order to ensure the safety and stability of power transmission, a communication mechanism is usually required between the transmitter (Tx) of the wireless charging system and the receiver (Rx) of the wireless system. To this end, in the related art, signal modulation is implemented at the receiver (Rx), that is, a capacitor and a corresponding control switch are connected to the resonant circuit of the receiver. During the wireless charging process, the capacitor is connected or removed by controlling the switch to change the resonant parameters in the resonant circuit, thereby realizing load modulation at the receiver.

[0003] However, this design not only increases the material cost, but also limits the continuous adjustment capability of the modulation depth because the modulation depth is limited by the actual modulation capacitor value, making it difficult to meet the needs of different application scenarios. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a modulation method, device and wireless charging system for a wireless charging system, which can achieve a load modulation effect at the receiving end of the wireless charging system without increasing material costs.

[0005] In a first aspect, an embodiment of the present invention provides a modulation method for a wireless charging system, which is applied to a wireless charging system, wherein the wireless charging system includes a transmitting end and a receiving end, wherein the receiving end includes a receiving end coil and a rectifier circuit connected to the receiving end coil, wherein the rectifier circuit is a circuit based on a MOS tube; the method includes: in response to the start of the wireless charging system, controlling the operation of the rectifier circuit according to a pre-configured rectification logic to rectify the energy coupled by the receiving end coil; monitoring the operation state of the lower MOS tube during the operation of the rectifier circuit; wherein the lower MOS tube is a MOS tube close to the ground end in the rectifier circuit; if it is monitored that the operation state of the lower MOS tube switches from an on state to an off state, controlling the lower MOS tube to be delayed shut down according to a pre-configured delayed shut-down parameter.

[0006] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the above-mentioned delayed shutdown parameter is used to characterize the delay duration of the delayed shutdown of the lower MOS tube; the step of controlling the delayed shutdown of the lower MOS tube according to the pre-configured delayed shutdown parameter includes: in response to the operating state of the lower MOS tube switching from the on state to the off state, controlling the lower MOS tube to maintain the on state; recording the retention time of the on state, and if the retention time reaches the delay time corresponding to the delayed shutdown parameter, controlling the lower MOS tube to shut down.

[0007] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation method of the first aspect, wherein the above method also includes: monitoring the current parameters corresponding to the lower MOS tube in the delayed shutdown stage; generating a modulation signal based on the current parameters, and sending the modulation signal to the transmitting end.

[0008] In combination with the first possible implementation manner of the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the above-mentioned rectification circuit includes a first upper MOS tube, a second upper MOS tube; a first lower MOS tube and a second lower MOS tube; wherein the first end of the first upper MOS tube is connected to a power pin, the second end of the first upper MOS tube is connected to the first end of the first lower MOS tube, and the second end of the first lower MOS tube is grounded; the first end of the second upper MOS tube is connected to the power pin, the second end of the second upper MOS tube is connected to the first end of the second lower MOS tube, and the second end of the second lower MOS tube is grounded; one end of the receiving end coil is connected to the connection path between the first upper MOS tube and the first lower MOS tube, and the other end of the receiving end coil is connected to the connection path between the second upper MOS tube and the second lower MOS tube; the step of controlling the rectification circuit to operate according to a pre-configured rectification logic to rectify the energy coupled by the receiving end coil includes: controlling the first upper MOS tube, the second lower MOS tube and the second upper MOS tube, and the first lower MOS tube to be alternately turned on according to the pre-configured rectification logic to rectify the energy coupled by the receiving end coil.

[0009] In combination with the third possible implementation of the first aspect, an embodiment of the present invention provides a fourth possible implementation of the first aspect, wherein the step of monitoring the operating status of the lower MOS tube during the operation of the rectifier circuit includes: monitoring the operating status of the first lower MOS tube and the second lower MOS tube during the operation of the rectifier circuit.

[0010] In combination with the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the step of controlling the lower MOS tube to maintain the on-state in response to the operation state of the lower MOS tube switching from the on-state to the off-state includes: in response to the operation state of the first lower MOS tube switching from the on-state to the off-state, controlling the first lower MOS tube to maintain the on-state, and controlling the first upper MOS tube to maintain the off-state; and controlling the second upper MOS tube to be turned off and controlling the second lower MOS tube to be turned on; or, in response to the operation state of the second lower MOS tube switching from the on-state to the off-state, controlling the second lower MOS tube to maintain the on-state, and controlling the second upper MOS tube to maintain the off-state; and controlling the first upper MOS tube to be turned off and controlling the first lower MOS tube to be turned on.

[0011] In combination with the third possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the above-mentioned receiving end is further configured with a rectifier drive circuit, and the rectifier drive circuit is provided with a control interface corresponding to each MOS tube; the control interface is connected to the control end of the corresponding MOS tube; the step of controlling the first upper MOS tube, the second lower MOS tube and the second upper MOS tube, and the first lower MOS tube to be alternately turned on according to a pre-configured rectification logic includes: controlling the rectifier drive circuit to generate control signals for the first upper MOS tube, the second lower MOS tube, the second upper MOS tube and the first lower MOS tube according to the rectification logic; and outputting the control signal through the control interface to control the first upper MOS tube, the second lower MOS tube and the second upper MOS tube, and the first lower MOS tube to be alternately turned on.

[0012] In a second aspect, an embodiment of the present invention further provides a modulation device of a wireless charging system, which is applied to a wireless charging system, wherein the wireless charging system includes a transmitting end and a receiving end, wherein the receiving end includes a receiving end coil and a rectifier circuit connected to the receiving end coil, wherein the rectifier circuit is a circuit based on a MOS tube; the device includes: a rectifier module, which is used to respond to the startup of the wireless charging system and control the operation of the rectifier circuit according to a pre-configured rectification logic to rectify the energy coupled by the receiving end coil; a monitoring module, which is used to monitor the operating state of the lower MOS tube during the operation of the rectifier circuit; wherein the lower MOS tube is a MOS tube close to the ground end in the rectifier circuit; and a modulation module, which is used to control the delayed shutdown of the lower MOS tube according to a pre-configured delayed shutdown parameter if it is detected that the operating state of the lower MOS tube switches from an on state to an off state.

[0013] In a third aspect, an embodiment of the present invention further provides a wireless charging system, comprising a transmitting end and a receiving end, wherein a controller of the receiving end is configured with a modulation device of the wireless charging system described in the second aspect; the receiving end also comprises a receiving end coil, and a rectifier circuit connected to the receiving end coil, wherein the rectifier circuit is a circuit based on a MOS tube; and the rectifier circuit is connected to the controller.

[0014] In combination with the third aspect, an embodiment of the present invention provides a first possible implementation manner of the third aspect, wherein the above-mentioned rectifier circuit includes a first upper MOS tube, a second upper MOS tube; a first lower MOS tube and a second lower MOS tube; wherein the first end of the first upper MOS tube is connected to a power pin, the second end of the first upper MOS tube is connected to the first end of the first lower MOS tube, and the second end of the first lower MOS tube is grounded; the first end of the second upper MOS tube is connected to the power pin, the second end of the second upper MOS tube is connected to the first end of the second lower MOS tube, and the second end of the second lower MOS tube is grounded; one end of the receiving end coil is connected to the connection path between the first upper MOS tube and the first lower MOS tube, and the other end of the receiving end coil is connected to the connection path between the second upper MOS tube and the second lower MOS tube; the receiving end is also configured with a rectifier drive circuit, and the rectifier drive circuit is provided with a control interface corresponding to each MOS tube; the control interface is connected to the control end of the corresponding MOS tube.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The modulation method, device and wireless charging system of the wireless charging system provided by the embodiment of the present invention can respond to the start of the wireless charging system, control the operation of the rectification circuit according to the pre-configured rectification logic, so as to rectify the energy obtained by the coupling of the receiving end coil; and monitor the operation state of the lower MOS tube during the operation of the rectification circuit; if it is monitored that the operation state of the lower MOS tube is switched from the on state to the off state, the lower MOS tube is controlled to be delayed to be turned off according to the pre-configured delayed turn-off parameter, and the delayed turn-off mode of the lower MOS tube can generate significant modulation current in the resonant cavity of the receiving end, and these modulation currents cause the resonant cavity current to have a significant phase change, thereby realizing communication modulation at the receiving end. At the same time, at the transmitting end, demodulation can be realized by detecting the phase change of the coil current signal, thereby realizing the communication mechanism between the transmitting end and the receiving end. At the same time, the entire modulation process does not need to increase the material cost, and the adjustment flexibility of the modulation depth is also improved to adapt to diverse application requirements.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a load modulation schematic diagram;

[0021] Figure 2 A schematic diagram of a wireless charging system provided by an embodiment of the present invention;

[0022] Figure 3 A flowchart of a modulation method for a wireless charging system provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a signal trend provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a modulation signal provided by an embodiment of the present invention;

[0025] Figure 6 A structural block diagram of a modulation device of a wireless charging system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] At present, in the field of wireless charging, when the transmitter and receiver of the wireless charging system communicate, their communication mechanism must meet the in-band communication protocol based on capacitive modulation developed by the Wireless Power Consortium (WPC). Figure 1A load modulation schematic diagram is shown, including a transmitter schematic diagram and a receiver schematic diagram of a wireless charging system. Specifically, Figure 1 The transmitting end coil L2 and the receiving end coil L1 are shown in FIG. The transmitting end and the receiving end of the wireless charging system realize energy transfer by means of coil coupling, and the receiving end also includes a rectifier circuit, that is, Figure 1 In the rectifier circuit, the diodes D1, D2, D3 and D4 are composed.

[0028] based on Figure 1 In the circuit diagram shown, the two signals LM1 and LM2 are responsible for controlling the two switch tubes Q1 and Q2 respectively to connect or remove the capacitors C6 and C7 from the resonant circuit, thereby changing the LC resonant parameters in the receiving end and realizing load modulation. In addition, Figure 1 Other components are also shown, such as a load Rload, a load capacitor C2, resonant capacitors C1, C4, and the like.

[0029] However, the above Figure 1 This design method not only increases the material cost, such as capacitors C6, C7, switch tubes Q1 and Q2, and load control circuit, but also limits the continuous adjustment capability of the modulation depth because the modulation depth is limited by the actual modulation capacitor value, making it difficult to meet the needs of different application scenarios. Therefore, in IC design, two pairs of LM control pins are usually reserved, and modulation capacitors of different capacitance values ​​are configured for each pair of LM. The firmware program is used to select a specific LM capacitor pair to adjust the modulation depth. Although this method is feasible, it will occupy more IC pin resources and also increase the material cost.

[0030] Based on this, the modulation method, device and wireless charging system of the wireless charging system provided by the embodiments of the present invention can achieve the load modulation effect of the receiving end while saving material costs.

[0031] To facilitate understanding of this embodiment, a modulation method of a wireless charging system disclosed in an embodiment of the present invention is first introduced in detail.

[0032] The modulation method of the wireless charging system in the embodiment of the present invention is applied to the wireless charging system, which includes a transmitting end and a receiving end, wherein the receiving end includes a receiving end coil and a rectifier circuit connected to the receiving end coil, and the rectifier circuit is a circuit based on a MOS tube;

[0033] For ease of understanding, Figure 2A schematic diagram of a wireless charging system is shown, including a transmitting end and a receiving end, wherein the transmitting end only shows the transmitting end coil L2 and the capacitor C for exemplary illustration, and the receiving end further shows the receiving end coil L1, the resonant capacitors C1 and C2, and the rectifier circuit, the capacitor C3 at the load output end and the load Rload, wherein the rectifier circuit includes a first upper MOS tube M1, a second upper MOS tube M2; a first lower MOS tube M3 and a second lower MOS tube M4.

[0034] A first end of the first upper MOS tube M1 is connected to a power pin VCC, and the power pin VCC is used to supply power to the MOS tube of the rectifier circuit; a second end of the first upper MOS tube is connected to a first end of the first lower MOS tube M3, and a second end of the first lower MOS tube M3 is grounded; a first end of the second upper MOS tube M2 is connected to the power pin VCC, a second end of the second upper MOS tube M2 is connected to a first end of the second lower MOS tube M4, and a second end of the second lower MOS tube M4 is grounded.

[0035] Further, if Figure 2 As shown, one end of the receiving end coil L1 is connected to the connection path between the first upper MOS transistor M1 and the first lower MOS transistor M3, and the other end of the receiving end coil L2 is connected to the connection path between the second upper MOS transistor M2 and the second lower MOS transistor M4.

[0036] In actual use, based on Figure 2 In the wireless charging system shown, the rectifier circuit composed of four MOS tubes is a rectifier bridge circuit, which can rectify the output of the LC resonant network at the receiving end of the wireless charging system; usually, a corresponding control circuit can be configured at the receiving end to control the MOS tube as a controller, and the control circuit usually includes logic circuits such as a logic controller and a comparator, thereby realizing the control of the conduction and shutdown of the four MOS tubes.

[0037] Based on the above Figure 2 The wireless charging system shown, Figure 3 A flow chart of a modulation method of a wireless charging system is also shown. Figure 3 As shown, the following steps are included:

[0038] Step S302, in response to the wireless charging system being started, controlling the operation of the rectifier circuit according to the pre-configured rectifier logic to rectify the energy coupled by the receiving end coil;

[0039] Step S304, monitoring the operating state of the lower MOS tube during the operation of the rectifier circuit;

[0040] The lower MOS tube in the embodiment of the present invention is a MOS tube close to the ground terminal in the rectifier circuit, such as Figure 2The first lower MOS tube M3 and the second lower MOS tube M4.

[0041] Step S306: If it is monitored that the operation state of the lower MOS tube switches from the on state to the off state, the lower MOS tube is controlled to be turned off with delay according to the pre-configured delay turn-off parameter.

[0042] The above-mentioned off state is also called the cut-off state, and, in actual use, in order to realize the rectification logic of the above-mentioned rectification circuit, the above-mentioned Figure 2 The first upper MOS tube M1, the second upper MOS tube M2, the first lower MOS tube M3 and the second lower MOS tube M4 are turned on alternately, that is, the first upper MOS tube and the second lower MOS tube are turned on at the same time, and while the first upper MOS tube and the second lower MOS tube are turned on, the second upper MOS tube and the first lower MOS tube are turned off. Similarly, while the first upper MOS tube and the second lower MOS tube are turned off, the second upper MOS tube and the first lower MOS tube are turned on, and the purpose of rectification is achieved by this logic.

[0043] Therefore, in the above step S302, when the rectification circuit is operated according to the pre-configured rectification logic, the first upper MOS tube, the second lower MOS tube and the second upper MOS tube, the first lower MOS tube need to be controlled to be turned on alternately according to the pre-configured rectification logic to rectify the energy coupled by the receiving end coil. The specific rectification control logic shall be subject to the actual use situation, and the embodiment of the present invention is not limited to this.

[0044] In the normal rectification state, if the receiving end is not modulated, when the wireless charging system is started and the load is charged, the receiving end can rectify the energy coupled by the receiving end coil according to the above step S302 to charge the load.

[0045] In order to ensure the safety and stability of power transmission, a communication mechanism needs to be established between the transmitter and the receiver of the wireless charging system. Therefore, load modulation is required at the receiving end, that is, the transmitter and the receiver communicate during the load charging process at the receiving end.

[0046] In the embodiment of the present invention, the operating state of the lower MOS tube of the rectifier circuit is monitored, and when it is monitored that the operating state of the lower MOS tube switches from the on state to the off state, the lower MOS tube is controlled to be delayed and turned off according to the pre-configured delayed turn-off parameters, thereby realizing the modulation process at the receiving end.

[0047] Specifically, in an embodiment of the present invention, the above-mentioned delayed shutdown parameter is used to characterize the delay time of delayed shutdown of the lower MOS tube; in the above-mentioned step S306, when controlling the delayed shutdown of the lower MOS tube, the lower MOS tube can be controlled to remain in the on state in response to the operation state of the lower MOS tube switching from the on state to the off state; then the holding time of the on state is recorded, and if the holding time reaches the delay time corresponding to the delayed shutdown parameter, the lower MOS tube is controlled to be turned off.

[0048] That is, when the operating state of the lower MOS tube is switched from the on state to the off state according to the rectification logic control, based on the delayed shutdown parameter, the lower MOS tube that needs to be turned off will continue to be turned on until the duration of the on-state reaches the delay duration corresponding to the delayed shutdown parameter, and then the lower MOS tube will be turned off.

[0049] Since the lower MOS tube that needs to be turned off continues to be turned on, at this time, based on the above rectification logic, the other lower MOS tube of the rectification circuit will be turned on, that is, within the delay time corresponding to the delayed shutdown parameter, the two lower MOS tubes of the rectification circuit ( Figure 2 The first lower MOS tube and the second lower MOS tube in the circuit are both turned on, that is, the two lower MOS tubes will be short-circuited for a short time, resulting in an increase in the current flowing through the lower MOS tubes. At this time, load modulation can be achieved by monitoring the current flowing through the lower MOS tubes. Therefore, the embodiment of the present invention also includes the following process:

[0050] Monitor the current parameters corresponding to the lower MOS tube in the delayed shutdown stage; for example, sample and monitor the current flowing through the lower MOS tube, then generate a modulation signal based on the current parameters, and send the modulation signal to the transmitter to achieve communication between the transmitter and the receiver.

[0051] Furthermore, the delay time can also be configured. For example, on the basis of satisfying the modulation signal strength, the delay time can be increased or decreased to achieve flexible control of different modulation depths, thereby causing the resonant current of the resonant cavity at the receiving end to change phase relative to the driving switch voltage at the receiving end. The specific control of the modulation depth is subject to actual use, and the embodiment of the present invention does not limit this.

[0052] In actual use, considering that there are two lower MOS tubes in the above rectifier circuit, that is, Figure 2 Therefore, in the above step S304, the operating states of the first lower MOS tube and the second lower MOS tube are specifically monitored during the operation of the rectifier circuit.

[0053] Furthermore, when the lower MOS tube is controlled to be turned off with delay, in response to the operation state of the first lower MOS tube switching from the on state to the off state, the first lower MOS tube can be controlled to remain in the on state, and the first upper MOS tube can be controlled to remain in the off state, and at the same time, the second upper MOS tube is controlled to be turned off and the second lower MOS tube is controlled to be turned on; or, in response to the operation state of the second lower MOS tube switching from the on state to the off state, the second lower MOS tube is controlled to remain in the on state, and the second upper MOS tube is controlled to remain in the off state; and the first upper MOS tube is controlled to be turned off and the first lower MOS tube is controlled to be turned on.

[0054] That is, based on the rectification logic, while the lower MOS tube is controlled to be turned off with time delay, the upper MOS tube that needs to be turned on is also controlled to be turned on with time delay to avoid short circuit caused by simultaneous conduction of the upper MOS tube and the lower MOS tube in one path.

[0055] For ease of understanding, Figure 2 Based on the schematic diagram of the wireless charging system shown, Figure 4 A signal trend diagram is also shown to illustrate the modulation process.

[0056] Specifically, the energy coupled by the receiving end coil L1 from the transmitting end coil is actually an alternating current signal. Therefore, in the rectifier circuit, the first upper MOS tube M1, the second upper MOS tube M2, the first lower MOS tube M3 and the second lower MOS tube M4 are alternately turned on, that is, when the first upper MOS tube M1 and the second lower MOS tube M4 are turned on, the second upper MOS tube M2 and the first lower MOS tube M3 are turned off. Similarly, when the first upper MOS tube M1 and the second lower MOS tube M4 are turned off, the second upper MOS tube M2 and the first lower MOS tube M3 are turned on.

[0057] Assume that in a signal cycle, in the rectification state, the first upper MOS tube M1 and the second lower MOS tube M4 are turned on first, and at the same time, the second upper MOS tube M2 and the first lower MOS tube M3 are turned off. At this time, the direction of the rectified signal is as follows: Figure 4 When the AC signal coupled from the transmitting end is commutated, in order to realize signal rectification, at this time, according to the rectification logic, the first upper MOS tube M1 and the second lower MOS tube M4 are controlled to be turned off, and at the same time, the second upper MOS tube M2 and the first lower MOS tube M3 are controlled to be turned on.

[0058] However, in the embodiment of the present invention, due to the existence of a modulation mechanism, the operating state of the lower MOS tube will be monitored during the operation of the rectifier circuit, that is, at this time, it will be monitored that the operating state of the second lower MOS tube M4 switches from the on state to the off state. At this time, based on the modulation mechanism, in the embodiment of the present invention, the second lower MOS tube M4 will be controlled to delay turning off, that is, enter the modulation state. In this state, the first lower MOS tube M3 will be normally turned on according to the rectification logic, the first upper MOS tube M1 will be normally turned off according to the rectification logic, and the second upper MOS tube M2 will be delayed to turn on based on the modulation mechanism, that is, the second upper MOS tube M2 remains in the off state. At this time, the first upper MOS tube M1 and the second upper MOS tube M2 will be turned off in the rectifier circuit, and at the same time, the first lower MOS tube M3 and the second lower MOS tube M4 will be turned on. At this time, the receiving end coil L1, the first lower MOS tube M3 and the second lower MOS tube M4 will form a path, such as Figure 4 As shown by the dotted arrows in the figure, that is, a short circuit phenomenon may occur in the two lower MOS tubes, resulting in an increase in the current flowing through the lower MOS tubes, thereby forming a modulation state in the embodiment of the present invention.

[0059] The duration of this modulation state is determined by the delay shutdown parameter.

[0060] When it is monitored that the duration of the modulation state reaches the delay duration corresponding to the above-mentioned delayed shutdown parameter, the normal rectification state is entered, that is, the second lower MOS tube M4 is controlled to be turned off, and at the same time, the second upper MOS tube M2 is controlled to be turned on. At this point, a modulation cycle is completed.

[0061] Similarly, when the next AC signal commutates, the next modulation signal can be obtained repeatedly until the entire charging process is completed.

[0062] Further, for ease of understanding, Figure 5 A schematic diagram of a modulation signal is also shown, such as Figure 5 As shown, specifically shown is the modulation signal monitored at the transmitting end based on the above modulation method of an embodiment of the present invention, such as the current of the transmitting end coil after phase demodulation, and the change of the signal obtained after low-pass filtering over time.

[0063] in, Figure 5 In the figure, signal A1 is the signal after modulation, and signal A2 is the signal before modulation, that is, the signal in the normal rectification state. Figure 5It can be seen that signal A1 has an obvious jump, that is, the modulation method provided in the embodiment of the present invention generates a significant modulation current in the resonant cavity. These modulation currents can cause the resonant cavity current at the transmitting end to have an obvious phase change. Therefore, the above modulation method in the embodiment of the present invention can achieve an equivalent load modulation effect, which not only saves material costs, but also improves the flexibility of adjusting the modulation depth to meet diverse application requirements.

[0064] In addition, the above receiving end is also configured with a rectifier drive circuit, which is provided with a control interface corresponding to each MOS tube, and the control interface is connected to the control end of the corresponding MOS tube, such as, Figure 2 The gates G1, G2, G3, and G4 of each MOS tube have corresponding control interfaces, and the MOS tube is turned on and off by controlling the gates.

[0065] Therefore, based on the above-mentioned rectification drive circuit, when the rectification circuit is controlled to operate according to the pre-configured rectification logic, the rectification drive circuit can be controlled to generate control signals for the first upper MOS tube, the second lower MOS tube, the second upper MOS tube and the first lower MOS tube according to the rectification logic; the control signal is output through the control interface to control the first upper MOS tube, the second lower MOS tube and the second upper MOS tube, and the first lower MOS tube to be alternately turned on, and the process of delaying the shutdown of the above-mentioned lower MOS tube can also be realized by the rectification drive circuit, such as continuously controlling the first lower MOS tube within the delay time, or turning on the second lower MOS tube, etc.

[0066] The specific rectifier drive circuit is also connected to the controller, that is, under the drive of the controller, a control signal is generated according to the rectification logic to control the on state and off state of each MOS tube. The specific rectifier drive circuit shall be based on actual usage, and the embodiment of the present invention does not limit this.

[0067] Further, based on the above embodiment, the embodiment of the present invention further provides a modulation device of a wireless charging system, which is applied to the wireless charging system, wherein the wireless charging system includes a transmitting end and a receiving end, wherein the receiving end includes a receiving end coil, and a rectifier circuit connected to the receiving end coil, wherein the rectifier circuit is a circuit based on a MOS tube;

[0068] like Figure 6 The structure block diagram of a modulation device of a wireless charging system shown in FIG. 1 includes:

[0069] The rectifier module 50 is used to respond to the start of the wireless charging system and control the operation of the rectifier circuit according to the pre-configured rectifier logic to rectify the energy coupled by the receiving end coil;

[0070] The monitoring module 52 is used to monitor the operating state of the lower MOS tube during the operation of the rectifier circuit; wherein the lower MOS tube is the MOS tube close to the ground terminal in the rectifier circuit;

[0071] The modulation module 54 is used to control the lower MOS tube to delay shutdown according to a pre-configured delayed shutdown parameter if it is monitored that the operating state of the lower MOS tube switches from the on state to the off state.

[0072] Furthermore, an embodiment of the present invention also provides a wireless charging system, which includes a transmitting end and a receiving end, and a controller of the receiving end is configured with the modulation device of the wireless charging system mentioned above.

[0073] Specifically, the receiving end also includes a receiving end coil, and a rectifier circuit connected to the receiving end coil, wherein the rectifier circuit is a circuit based on a MOS tube; the rectifier circuit is connected to the controller.

[0074] Further, the wireless charging system provided by the embodiment of the present invention can refer to Figure 2 The schematic diagram shown, that is, the rectifier circuit includes a first upper MOS tube, a second upper MOS tube; a first lower MOS tube and a second lower MOS tube; wherein the first end of the first upper MOS tube is connected to a power pin, the second end of the first upper MOS tube is connected to the first end of the first lower MOS tube, and the second end of the first lower MOS tube is grounded; the first end of the second upper MOS tube is connected to a power pin, the second end of the second upper MOS tube is connected to the first end of the second lower MOS tube, and the second end of the second lower MOS tube is grounded; one end of the receiving end coil is connected to the connection path between the first upper MOS tube and the first lower MOS tube, and the other end of the receiving end coil is connected to the connection path between the second upper MOS tube and the second lower MOS tube; the receiving end is also configured with a rectifier drive circuit, and the rectifier drive circuit is provided with a control interface corresponding to each MOS tube; the control interface is connected to the control end of the corresponding MOS tube.

[0075] The wireless charging system and the modulation device of the wireless charging system provided in the embodiments of the present invention have the same technical features as the modulation method of the wireless charging system provided in the above embodiments, so they can also solve the same technical problems and achieve the same technical effects.

[0076] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the wireless charging system and the modulation device of the wireless charging system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0077] The modulation method, device and computer program product of the wireless charging system provided in the embodiments of the present invention include a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be referred to the method embodiment, which will not be repeated here.

[0078] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0080] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0081] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A modulation method for a wireless charging system, characterized in that: Applied to a wireless charging system, the wireless charging system includes a transmitting end and a receiving end, the receiving end includes a receiving end coil, and a rectifier circuit connected to the receiving end coil, the rectifier circuit is a circuit based on a MOS tube; The method comprises: In response to the wireless charging system being started, controlling the rectification circuit to operate according to a pre-configured rectification logic to rectify the energy coupled by the receiving end coil; Monitoring the operating state of the lower MOS tube during the operation of the rectifier circuit; wherein the lower MOS tube is a MOS tube close to the ground terminal in the rectifier circuit; If it is monitored that the operation state of the lower MOS tube is switched from the on state to the off state, the lower MOS tube is controlled to be turned off with delay according to the pre-configured delayed turn-off parameter.

2. The method according to claim 1, characterized in that The delayed shutdown parameter is used to characterize the delay duration of delayed shutdown of the lower MOS tube; The step of controlling the delayed shutdown of the lower MOS tube according to the pre-configured delayed shutdown parameters comprises: In response to the operation state of the lower MOS tube switching from the on state to the off state, controlling the lower MOS tube to maintain the on state; The holding time of the on state is recorded, and if the holding time reaches the delay time corresponding to the delayed shutdown parameter, the lower MOS tube is controlled to be turned off.

3. The method according to claim 1, characterized in that The method further comprises: Monitoring the current parameter corresponding to the lower MOS tube in the delayed shutdown phase; A modulation signal is generated based on the current parameter, and the modulation signal is sent to the transmitting end.

4. The method according to claim 2, characterized in that: The rectifier circuit includes a first upper MOS tube, a second upper MOS tube, a first lower MOS tube and a second lower MOS tube; Wherein, the first end of the first upper MOS tube is connected to the power pin, the second end of the first upper MOS tube is connected to the first end of the first lower MOS tube, and the second end of the first lower MOS tube is grounded; The first end of the second upper MOS tube is connected to the power pin, the second end of the second upper MOS tube is connected to the first end of the second lower MOS tube, and the second end of the second lower MOS tube is grounded; One end of the receiving end coil is connected to the connection path between the first upper MOS transistor and the first lower MOS transistor, and the other end of the receiving end coil is connected to the connection path between the second upper MOS transistor and the second lower MOS transistor; The step of controlling the operation of the rectification circuit according to the pre-configured rectification logic to rectify the energy coupled by the receiving end coil comprises: The first upper MOS tube, the second lower MOS tube and the second upper MOS tube, the first lower MOS tube are controlled to be turned on alternately according to a pre-configured rectification logic, so as to rectify the energy coupled by the receiving end coil.

5. The method according to claim 4, characterized in that The step of monitoring the operating state of the lower MOS tube during the operation of the rectifier circuit includes: During the operation of the rectifier circuit, the operating states of the first lower MOS tube and the second lower MOS tube are monitored.

6. The method according to claim 5, characterized in that In response to the operation state of the lower MOS tube being switched from the on state to the off state, the step of controlling the lower MOS tube to maintain the on state comprises: In response to the operation state of the first lower MOS tube switching from the on state to the off state, the first lower MOS tube is controlled to maintain the on state, and the first upper MOS tube is controlled to maintain the off state; and, Controlling the second upper MOS tube to turn off and controlling the second lower MOS tube to turn on; or, In response to the operation state of the second lower MOS tube switching from the on state to the off state, the second lower MOS tube is controlled to maintain the on state, and the second upper MOS tube is controlled to maintain the off state; and, The first upper MOS tube is controlled to be turned off and the first lower MOS tube is controlled to be turned on.

7. The method according to claim 4, characterized in that The receiving end is also configured with a rectifier drive circuit, and the rectifier drive circuit is provided with a control interface corresponding to each MOS tube; the control interface is connected to the control end of the corresponding MOS tube; The step of controlling the first upper MOS tube, the second lower MOS tube, and the second upper MOS tube, the first lower MOS tube to be alternately turned on according to a pre-configured rectification logic includes: Controlling the rectification driving circuit to generate control signals for the first upper MOS transistor, the second lower MOS transistor, the second upper MOS transistor, and the first lower MOS transistor according to the rectification logic; The control signal is output through the control interface to control the first upper MOS tube, the second lower MOS tube and the second upper MOS tube, the first lower MOS tube to be alternately turned on.

8. A modulation device for a wireless charging system, characterized in that: Applied to a wireless charging system, the wireless charging system includes a transmitting end and a receiving end, the receiving end includes a receiving end coil, and a rectifier circuit connected to the receiving end coil, the rectifier circuit is a circuit based on a MOS tube; The device comprises: A rectifier module, configured to respond to the start of the wireless charging system and control the operation of the rectifier circuit according to a pre-configured rectifier logic to rectify the energy coupled by the receiving end coil; A monitoring module, used to monitor the operating state of the lower MOS tube during the operation of the rectifier circuit; wherein the lower MOS tube is a MOS tube close to the ground terminal in the rectifier circuit; The modulation module is used to control the delayed shutdown of the lower MOS tube according to the pre-configured delayed shutdown parameters if it is monitored that the operating state of the lower MOS tube switches from the on state to the off state.

9. A wireless charging system, characterized in that: The wireless charging system comprises a transmitting end and a receiving end, and the controller of the receiving end is configured with a modulation device of the wireless charging system according to claim 8; The receiving end further includes a receiving end coil and a rectifier circuit connected to the receiving end coil, wherein the rectifier circuit is a circuit based on a MOS tube; The rectifier circuit is connected to the controller.

10. The wireless charging system according to claim 9, characterized in that: The rectifier circuit includes a first upper MOS tube, a second upper MOS tube, a first lower MOS tube and a second lower MOS tube; Wherein, the first end of the first upper MOS tube is connected to the power pin, the second end of the first upper MOS tube is connected to the first end of the first lower MOS tube, and the second end of the first lower MOS tube is grounded; The first end of the second upper MOS tube is connected to the power pin, the second end of the second upper MOS tube is connected to the first end of the second lower MOS tube, and the second end of the second lower MOS tube is grounded; One end of the receiving end coil is connected to the connection path between the first upper MOS transistor and the first lower MOS transistor, and the other end of the receiving end coil is connected to the connection path between the second upper MOS transistor and the second lower MOS transistor; The receiving end is also configured with a rectifier drive circuit, and the rectifier drive circuit is provided with a control interface corresponding to each MOS tube; the control interface is connected to the control end of the corresponding MOS tube.

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