Wireless electric-energy receiving circuit, wireless charging device, and system

Abstract

Provided in the embodiments of the present application is a wireless electric-energy receiving circuit, which comprises a receiving coil, a matching circuit, a rectifier circuit, a controller, and an output end, wherein the rectifier circuit comprises at least one switching unit; the receiving coil is used for receiving energy and outputting an alternating current; the matching circuit is used for performing matching on the alternating current and then transmitting same to an input end of the rectifier circuit; the rectifier circuit is used for converting the input alternating current into a direct current; and the controller is used for determining a duty cycle of the at least one switching unit on the basis of an output voltage of a voltage output end and controlling the on or off of the at least one switching unit on the basis of the duty cycle, so as to perform voltage adjustment on the output voltage, the duty cycle being independent of the dominant frequency of the wireless electric-energy receiving circuit.

Description

Wireless power receiving circuit, wireless charging device and system Technical Field

[0001] The embodiments of the present application relate to the fields of electronic devices and wireless charging, and more specifically, to a wireless power receiving circuit, a wireless charging device, and a system. Background Art

[0002] The power limits of mobile and portable wireless charging devices such as mobile phones are gradually increasing. Therefore, it is necessary to increase the wireless charging power and shorten the charging time to improve the user charging experience. However, due to the limited heat dissipation capacity of the terminal equipment, in order to support higher wireless charging power, the efficiency of the wireless charging receiver needs to be further improved.

[0003] In the existing technology, the output voltage is adjusted through pulse modulation. However, the modulation frequency of pulse modulation is generated based on the main frequency of wireless charging, and the main frequency needs to be detected, and continuous voltage regulation is not supported.

[0004] Summary of the Invention

[0005] The present application provides a wireless power receiving circuit, a wireless charging device, and a system that can achieve continuous voltage regulation.

[0006] In a first aspect, the present application provides a wireless power receiving circuit, comprising: a receiving coil, a matching circuit, a rectifier circuit, a controller and an output end, the rectifier circuit comprising at least one switching unit; the receiving coil is used to receive energy and output alternating current; the matching circuit is used to match the alternating current and transmit it to the input end of the rectifier circuit; the rectifier circuit is used to convert the input alternating current into direct current; the controller is used to determine the duty cycle of the at least one switching unit according to the output voltage of the voltage output end, and control the opening or closing of the at least one switching unit according to the duty cycle to adjust the output voltage; wherein the duty cycle is independent of the main frequency of the wireless power receiving circuit.

[0007] Since the duty cycle is independent of the main frequency of the wireless power receiving circuit, the duty cycle can be set to not be an integer multiple of the main frequency. Thus, when the output voltage changes continuously, the duty cycle also changes continuously.

[0008] The voltage adjustment may be a voltage boost adjustment.

[0009] Existing implementations require detecting the main frequency for voltage regulation, and the determined duty cycle of the switch is an integer multiple of the main frequency, making continuous voltage regulation impossible. In this application, voltage regulation is achieved without the use of additional voltage stabilization components in the hardware structure, and the duty cycle is independent of the main frequency of the wireless power receiving circuit, thus achieving continuous voltage regulation without detecting the main frequency.

[0010] In a possible implementation, the duty cycle is not an integer multiple of the main frequency.

[0011] In a possible implementation, when the output voltage changes continuously, the duty cycle also changes continuously.

[0012] In a possible implementation, the rectifier circuit further includes: a rectifier bridge, which includes a plurality of diodes; wherein each of the switch units is connected in parallel to one of the diodes.

[0013] In a possible implementation, the at least one switch unit includes only a first switch unit.

[0014] In one possible implementation, the at least one switch unit includes a first switch unit and a second switch unit, and the multiple diodes include a diode located at the upper tube and a diode located at the lower tube; the first switch unit and the second switch unit are both connected in parallel to the diode located at the lower tube; or, the first switch unit and the second switch unit are both connected in parallel to the diode located at the upper tube; or, the first switch unit is connected in parallel to the diode located at the lower tube, the second switch unit is connected in parallel to the diode located at the upper tube, and the first switch unit and the second switch unit are not directly connected.

[0015] It should be understood that the diode and the switch unit can be a two-in-one device, or a combination of a diode and a switch tube.

[0016] In a possible implementation, controlling the at least one switch unit to be turned on or off includes: controlling the first switch unit and the second switch unit to be turned on or off simultaneously.

[0017] In a possible implementation, the rectifier circuit further includes: a rectifier bridge, which includes a plurality of controllable switch tubes including the at least one switch unit.

[0018] In a possible implementation, the at least one switch unit includes only a first switch unit.

[0019] In a possible implementation, the at least one switch unit includes a first switch unit and a second switch unit, wherein:

[0020] The first switch unit and the second switch unit are both controllable switch tubes of the lower tube; or,

[0021] The first switch unit and the second switch unit are both controllable switch tubes of the upper tube; or,

[0022] The first switch unit is a controllable switch tube of the lower tube, the second switch unit is a controllable switch tube of the upper tube, and the first switch unit and the second switch unit are not directly connected.

[0023] In a possible implementation, controlling the at least one switch unit to be turned on or off includes: controlling the first switch unit and the second switch unit to be turned on or off simultaneously.

[0024] In a second aspect, the present application provides a wireless power receiving circuit, comprising: a receiving coil, a detuning circuit, a rectifier circuit, a controller and an output end, the detuning circuit comprising a matching circuit and a grounded target branch, the matching circuit being connected to the target branch, the target branch comprising a detuning capacitor and a switch unit; the receiving coil being used to receive energy and output alternating current; the rectifier circuit being used to convert the input alternating current into direct current; the controller being used to determine the duty cycle of the switch unit according to the output voltage of the voltage output end, and to control the switching unit to be turned on or off according to the duty cycle, so as to adjust the output voltage; wherein the duty cycle is independent of the main frequency of the wireless power receiving circuit.

[0025] This is equivalent to directly connecting a detuned capacitor and a switch tube in series with the matching circuit 505 and the ground, and using the controller 503 to generate a modulation signal S2 independent of the wireless charging main frequency to control the opening and closing of the switch, thereby achieving step-down control.

[0026] The voltage adjustment may be a step-down adjustment.

[0027] In a possible implementation, the duty cycle is not an integer multiple of the main frequency.

[0028] In a possible implementation, when the output voltage changes continuously, the duty cycle also changes continuously.

[0029] In one possible implementation, the matching capacitor includes a first capacitor and a second capacitor, the first capacitor and the second capacitor are located at the first end of the receiving coil, the target branch includes a first branch and a second branch; the first branch includes a first detuning capacitor and a first switching unit, and the second branch includes a second detuning capacitor and a second switching unit; the first branch is connected between a node between the first capacitor and the second capacitor and ground, and the second branch is connected between a node located at the second end of the receiving coil and ground.

[0030] It should be understood that the matching capacitor includes at least a first capacitor, and may be a plurality of capacitors (e.g., a first capacitor and a second capacitor);

[0031] The target branch may include at least a first branch; it may be multiple branches (eg, a first branch and a second branch), generally 1 or 2 branches.

[0032] In a possible implementation, controlling the switch unit to be turned on or off includes controlling the first switch unit and the second switch unit to be turned on or off simultaneously.

[0033] In a third aspect, the present application provides a wireless charging device, comprising a wireless power receiving circuit and an energy storage device as described in any one of the first aspect or the second aspect, wherein the wireless power receiving circuit is used as a receiving end of wireless charging; the wireless power receiving circuit is used to receive electrical energy and transmit the electrical energy to the energy storage device.

[0034] In a fourth aspect, the present application provides a charging system, characterized in that it includes the wireless charging device and the wireless power supply device as described in the fourth aspect.

[0035] In a fifth aspect, the present application provides a wireless charging control method, which is applied to a wireless charging receiving end, wherein the receiving end includes: a receiving coil, a matching circuit, a rectifier circuit, a controller, and an output end, wherein the rectifier circuit includes at least one switch unit;

[0036] The method comprises:

[0037] The output voltage is adjusted by determining a duty cycle of the at least one switching unit according to the output voltage of the voltage output terminal, and controlling the on or off of the at least one switching unit according to the duty cycle; wherein the duty cycle is independent of the main frequency of the wireless power receiving circuit.

[0038] In a possible implementation, the duty cycle is not an integer multiple of the main frequency.

[0039] In a possible implementation, when the output voltage changes continuously, the duty cycle changes continuously at the same time.

[0040] In a sixth aspect, the present application provides a wireless charging control method, which is applied to a wireless charging receiving end, the receiving end comprising: a receiving coil, a detuning circuit, a rectifier circuit, a controller, and an output end, the detuning circuit comprising a matching circuit and a grounded target branch, the matching circuit and the target branch being connected, the target branch comprising a detuning capacitor and a switch unit;

[0041] The method comprises:

[0042] The duty cycle of the switching unit is determined according to the output voltage of the voltage output terminal, and the switching unit is controlled to be turned on or off according to the duty cycle to adjust the output voltage; wherein the duty cycle is independent of the main frequency of the wireless power receiving circuit.

[0043] In a possible implementation, the duty cycle is not an integer multiple of the main frequency.

[0044] In a possible implementation, when the output voltage changes continuously, the duty cycle changes continuously at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a schematic diagram of a wireless charging system applicable to the present application;

[0046] FIG2 is a schematic diagram of several wireless reverse charging scenarios provided by an embodiment of the present application;

[0047] FIG3 is a schematic diagram of another wireless charging system provided in an embodiment of the present application;

[0048] FIG4 is a schematic diagram of the wireless charging principle;

[0049] FIG5 is a schematic structural diagram of a circuit;

[0050] FIG6 is a schematic structural diagram of a circuit;

[0051] FIG7 is a schematic structural diagram of a circuit;

[0052] FIG8 is a schematic diagram of a duty cycle. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0054] It should be noted that, in the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0055] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two, and "at least one" and "one or more" refer to one, two or more. The singular expressions "a", "a", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0056] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0057] In the description of the embodiments of the present application, the terms "up", "down", "left", "right", "inside", "outside", "vertical", "horizontal", etc. indicate orientations or positional relationships that are defined relative to the orientations or positions of the components schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts. They are used for relative descriptions and clarifications, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They may change accordingly according to changes in the orientation of the components placed in the accompanying drawings, and therefore cannot be understood as limitations on the present application. In addition, the "vertical" involved in the present application is not vertical in the strict sense, but is within the allowable error range. The "parallel" is not parallel in the strict sense, but is within the allowable error range.

[0058] In the embodiments of this application, the same reference numerals are used to represent the same components or parts. For identical parts in the embodiments of this application, only one of the parts or parts may be labeled with a reference numeral in the figures as an example. It should be understood that the same reference numerals apply to the other identical parts or parts. In addition, the various parts in the drawings are not drawn to scale, and the sizes and dimensions of the parts shown in the drawings are only exemplary and should not be construed as limiting the present application.

[0059] FIG1 shows a schematic diagram of a wireless charging system applicable to the present application.

[0060] As shown in Figure 1, wireless charging system 100 may include a wireless charging transmitter 110 and a wireless charging receiver 120. Energy coupling enables energy transfer between wireless charging transmitter 110 and wireless charging receiver 120. More specifically, wireless charging transmitter 110, acting as an energy source, can charge wireless charging receiver 120 using the principle of electromagnetic induction.

[0061] In some embodiments, the wireless charging transmitting device 110 as a power supply device may also be referred to as a transmitting end, and the wireless charging receiving device 120 as a power receiving device may also be referred to as a receiving end.

[0062] In the embodiment of the present application, the wireless charging transmitting device 110 or the wireless charging receiving device 120 can be a smart phone, a smart watch, a smart bracelet, a stylus, an earphone, a charging box, a tablet computer, an e-reader, a laptop computer, a camera, a vehicle-mounted device, a wireless charger, a mobile charger (also called a mobile power supply or a mobile power supply), a wearable device (such as smart glasses, smart jewelry, etc.), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a smart home device (such as a smart screen, a smart TV) or a vehicle, etc., which have a wireless charging function.

[0063] As an example and not a limitation, the wireless charging transmitting device 110 is a charging base, and the wireless charging receiving device 120 is a mobile phone; alternatively, the wireless charging transmitting device 110 is a charging box, and the wireless charging receiving device 120 is a wireless headset; alternatively, the wireless charging transmitting device 110 is a smart phone, and the wireless charging receiving device 120 is a smart watch; alternatively, the wireless charging transmitting device 110 is a vehicle, and the wireless charging receiving device 120 is a portable electronic device such as a mobile phone, a tablet computer, and the like.

[0064] In some embodiments, the wireless charging system 100 may further include a charger 130, which is connected to the wireless charging transmitter 110. The charger 130 may be configured to receive AC power and convert it into DC power for output to the wireless charging transmitter 110. Alternatively, the charger 130 may be configured to directly output received AC power to the wireless charging transmitter 110. The wireless charging transmitter 110 is configured to convert received electrical energy into electromagnetic field energy and transmit it to the outside world. The wireless charging receiver 120 is configured to receive electromagnetic field energy and convert it into electrical energy, thereby achieving wireless charging.

[0065] In some embodiments, the wireless charging system 100 may further include an energy device 140, such as a battery. The wireless charging transmitter 110 may be directly connected to the energy device 140 to receive direct current or alternating current provided by the energy device 140 as input.

[0066] In some embodiments, the wireless charging receiving device 120 can also serve as an energy source to charge other devices that support wireless charging. For example, a mobile phone with wireless charging functionality can charge wireless charging-enabled devices such as headphones, watches, or other mobile phones. In other words, the wireless charging receiving device 120 can both receive power from the wireless charging transmitting device 110 and function as a wireless charging transmitting device to charge other wireless charging receiving devices, thus supporting wireless reverse charging. Unlike the power supply method of a wireless charging base, wireless reverse charging relies primarily on the device battery, resulting in relatively low charging power.

[0067] It should be noted that the term "device having a wireless charging function" or similar descriptions used in this application can be understood as meaning that the device has the ability to wirelessly transmit power to other devices and / or the device has the ability to wirelessly receive power transmitted from other devices. In other words, the device can be either a transmitter or a receiver.

[0068] It should be noted that the "device having a wireless reverse charging function" or similar descriptions involved in this application can be understood as the device having the ability to receive power transmitted from other devices wirelessly and the ability to transmit power to other devices wirelessly.

[0069] Figure 2 shows a schematic diagram of several wireless reverse charging scenarios provided by the embodiments of the present application. It is understood that the embodiments of the present application do not limit the specific form of the wireless reverse charging scenarios, and the wireless reverse charging scenarios described in Figure 2 are only a few examples given for ease of understanding.

[0070] As shown in (a) of Figure 2, the wireless reverse charging scenario may include a mobile phone 121 and a watch 151. The mobile phone 121 can act as a receiving end to receive the power during the wireless charging process, or it can act as a transmitting end to wirelessly reverse charge the watch 151 after turning on the wireless reverse charging function. In this case, the watch 151 is the receiving end in the wireless reverse charging process.

[0071] As shown in (b) of Figure 2, the wireless reverse charging scenario may include a mobile phone 122 and an earphone charging box 152. The mobile phone 122 can act as a receiver to receive power during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the earphone charging box 152 after the wireless reverse charging function is turned on. In this case, the earphone charging box 152 is the receiver during the wireless reverse charging process.

[0072] As shown in (c) of Figure 2, the wireless reverse charging scenario may include a first mobile phone 123 and a second mobile phone 153. The first mobile phone 123 can act as a receiver to receive power during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the second mobile phone 153 after turning on the wireless reverse charging function. In this case, the second mobile phone 153 is the receiver during the wireless reverse charging process.

[0073] As shown in (d) of FIG2 , the wireless reverse charging scenario may include a tablet computer 124 and a stylus pen 154. The tablet computer 124 can act as a receiver to receive power during the wireless charging process, or it can act as a transmitter to wirelessly reverse charge the stylus pen 154 after the wireless reverse charging function is enabled. In this case, the stylus pen 154 acts as a receiver during the wireless reverse charging process.

[0074] In (a) to (d) of FIG2 , the watch 151 , the earphone charging box 152 , the second mobile phone 153 , and the stylus 154 may not have the wireless reverse charging function, or the wireless reverse charging function may not be turned on temporarily.

[0075] It should be understood that the embodiments of the present application do not limit the specific types of devices in the wireless reverse charging scenario. For example, the power supply device (i.e., the electronic device that turns on the wireless reverse charging function and wirelessly charges other devices) can be, for example, a mobile phone, a tablet computer, a laptop computer, or other portable electronic device. The power receiving device (i.e., the electronic device that is wirelessly charged by the power supply device) can be, for example, a mobile phone, a bracelet, a watch, a headset, a keyboard, a stylus, an electric toothbrush, or other portable electronic device.

[0076] In addition, it can be understood that the wireless reverse charging scenario is one type of wireless charging scenario. Accordingly, (a) to (d) in Figure 2 are actually specific examples of the wireless charging system 100, the mobile phone 121, the mobile phone 122, the first mobile phone 123, and the tablet computer 124 are specific examples of the wireless charging transmitting device 110 shown in Figure 1, and the watch 151, the earphone charging box 152, the second mobile phone 153, and the stylus 154 are specific examples of the wireless charging receiving device 120 shown in Figure 1.

[0077] Figure 3 shows another wireless charging system 100 provided by an embodiment of the present application. The embodiment shown in Figure 3 is described by taking the wireless charging transmitting device 110 as a glasses case and the wireless charging receiving device 120 as smart glasses as an example.

[0078] The wireless charging transmitter device 110 may include a housing 111 and a wireless power receiving circuit 113. The wireless power receiving circuit 113 may be fixed to the housing 111, for example, to the inner wall of the housing 111. The housing 111 may also be used to accommodate glasses, such as the wireless charging receiving device 120 shown in FIG3 .

[0079] The wireless charging receiving device 120 may include a frame 123, temples 124, and a lens 125. The number of temples 124 may be one or more. In the embodiment shown in FIG3 , the number of temples 124 may be multiple. The lens 125 is fixed to the frame 123.

[0080] One end of the temple 124 can be rotatably connected to one end of the frame 123 via a connecting shaft, so that the temple 124 can switch between an expanded state and a folded state. In some embodiments, one end of the temple 124 can be detachably connected to one end of the frame 123 via a connecting shaft. When the temple 124 is in the expanded state, the temple 124 can be worn on the user's ear. Figure 3 is a schematic diagram of the temple 124 in the folded state. When the temple 124 is in the folded state, the temple 124 is folded relative to the frame 123. In some embodiments, the temple 124 in the folded state is conducive to the smart glasses 100 being stored in a glasses case (such as the wireless charging transmitter device 110 shown in Figure 3, or an ordinary glasses case).

[0081] The temples 124 may be provided with electronic components (not shown), such as a mainboard, a wireless power receiving circuit 122, and a battery. The mainboard may be provided with a voice control module, a gesture recognition module, or an eye tracking module. The battery serves as a power source and can provide electrical energy to the temples 124. The wireless power receiving circuit 122 may include a receiving coil, which can charge the battery via the receiving coil. In some embodiments, the battery may be located at the end of the temple away from the frame, and the wireless power receiving circuit 122 and the mainboard may be located at the end of the temple closer to the frame.

[0082] In some possible scenarios, smart glasses may be augmented reality (AR) smart glasses. When the smart glasses are worn on the user's head, the user can see the image presented by the display unit (not shown) of the smart glasses. That is, the user can not only view the real-world scene through the smart glasses, but also observe the image of the virtual world through the smart glasses. In some embodiments, the user can also use the smart glasses to enable the smart glasses to enhance the observation effect of the real world by displaying virtual images. In other possible scenarios, smart glasses may not be limited to AR smart glasses, and smart glasses may also be other smart glasses, such as VR smart glasses that realize virtual reality (VR) effects or smart glasses that realize mixed reality (MR) effects, smart glasses with audio functions, etc.

[0083] The following describes the principle of wireless charging from the wireless charging transmitting device 110 to the wireless charging receiving device 120 in conjunction with the wireless charging system 100 shown in FIG. 1 , FIG. 2 and FIG. 3 .

[0084] During the process of wireless charging transmitting device 110 wirelessly charging wireless charging receiving device 120 , wireless charging transmitting device 110 and wireless charging receiving device 120 may be close to each other so that the transmitting coil of wireless charging transmitting device 110 may be coupled with the receiving coil of wireless charging receiving device 120 .

[0085] In the embodiment shown in FIG1 , a magnetic component may be provided near the frame of the wireless charging transmitter device 110 . The magnetic component may be used to attach the wireless charging receiver device 120 to the frame of the wireless charging transmitter device 110 , so that the transmitting coil of the wireless charging transmitter device 110 can be stably coupled with the receiving coil of the wireless charging receiver device 120 .

[0086] In the embodiment shown in FIG3 , the wireless charging receiving device 120 can be folded and accommodated in the accommodation cavity of the wireless charging transmitting device 110 , and the wireless power receiving circuit 122 of the wireless charging receiving device 120 can be arranged close to the wireless power receiving circuit 113 of the wireless charging transmitting device 110 , so that the transmitting coil of the wireless charging transmitting device 110 can be stably coupled with the receiving coil of the wireless charging receiving device 120 .

[0087] The wireless power receiving circuit 113 can transmit a changing magnetic field through the transmitting coil. The coil of the wireless power receiving circuit 122 can sense the magnetic field from the wireless power receiving circuit 113 and generate an induced current. The wireless power receiving circuit 122 can transmit the induced current generated by the coil to other components within the wireless power receiving device 120, such as a battery. In this scenario, the coil of the wireless power transmitting device 110 can be the transmitting coil, and the coil of the wireless power receiving device 120 can be the receiving coil.

[0088] In some embodiments, the wireless charging transmitting device 110 can also be a wireless charging receiving device, that is, other devices can wirelessly charge the wireless power receiving circuit 113. The coil of the wireless power receiving circuit 113 can sense the magnetic field from other devices and generate an induced current. The wireless power receiving circuit 113 can transfer the induced current generated by the coil to other devices within the wireless power receiving circuit 113. In this scenario, the coil of the wireless charging transmitting device 110 can be a receiving coil. In other words, the coil of the wireless charging transmitting device 110 can act as both a transmitting coil and a receiving coil. For example, in the embodiment shown in Figure 3, the glasses case can obtain power from the wireless charger through the wireless power receiving circuit 113.

[0089] In other embodiments, the wireless charging receiving device 120 can also be a wireless charging transmitting device, that is, the wireless power receiving circuit 122 can wirelessly charge other devices. The coil of the wireless power receiving circuit 122 can emit a changing magnetic field, allowing the wireless charging receiving device 120 to wirelessly charge other devices. In this scenario, the coil of the wireless charging receiving device 120 can be a transmitting coil. In other words, the coil of the wireless charging receiving device 120 can serve as both a receiving coil and a transmitting coil. For example, in the embodiment shown in Figure 1, a stylus can wirelessly charge other devices via the wireless power receiving circuit 122. For another example, in the embodiment shown in Figure 2, smart glasses can wirelessly charge other devices via the wireless power receiving circuit 12.

[0090] In some embodiments provided herein, the coil may be a ring-shaped winding formed by tightly winding a conductive wire, and the conductive wire may be wrapped with an insulating material.

[0091] Figure 4 shows a schematic diagram of the wireless charging principle. As shown in Figure 4, the wireless charging scenario involves a transmitter 210 (i.e., a power supply device) and a receiver 220 (i.e., a power receiving device). Both the transmitter 210 and the receiver 220 have wireless charging capabilities, which are used to implement the wireless charging process of the transmitter 210 to the receiver 220.

[0092] The transmitter 210 may include a first coil 211, a first chip 212, and a power supply 213. The receiver 220 may include a second coil 221, a second chip 222, and a load 223. The first coil 211 and the second coil 221 are used to implement energy coupling. The first chip 212 and the second chip 222 are used to implement wireless charging control or management. The power supply 213 and the load 223 are used to store electrical energy.

[0093] After the wireless charging area of ​​the transmitter 210 is aligned with the wireless charging area of ​​the receiver 220, the transmitter 210 can wirelessly charge the receiver 220. Specifically, during the wireless charging process, the transmitter 210 can control the power supply 213 to output current to the first coil 211 (i.e., the power output coil) through the first chip 212, so that the first coil 211 can emit a high-frequency magnetic field, that is, convert the electrical signal into a magnetic signal. The high-frequency magnetic field can pass through the second coil 221 (i.e., the power receiving coil), so that an induced current is generated on the second coil 221, that is, the magnetic signal is converted into an electrical signal. The second chip 222 can detect the induced current and input the induced current to the load 223.

[0094] In some embodiments, the first chip 212 may include a transformer module and a transmitter circuit, wherein the transformer module is used to implement voltage conversion and the transmitter circuit is used to convert direct current into alternating current signals. Accordingly, the first coil 211 is used to convert the alternating current signals into magnetic signals and transmit them.

[0095] In some embodiments, the second chip 222 may include a transformer module and a receiving circuit, wherein the second coil 221 is used to convert the magnetic signal into an AC signal, the receiving circuit is used to convert the AC signal into a DC signal, and the transformer module is used to achieve voltage conversion.

[0096] The power limits of mobile and portable wireless charging devices such as mobile phones are gradually increasing. Therefore, it is necessary to increase the wireless charging power and shorten the charging time to improve the user charging experience. However, due to the limited heat dissipation capacity of the terminal equipment, in order to support higher wireless charging power, the efficiency of the wireless charging receiver needs to be further improved.

[0097] In the existing technology, the output voltage is adjusted through pulse modulation. However, the modulation frequency of pulse modulation is generated based on the main frequency of wireless charging, and the main frequency needs to be detected, and continuous voltage regulation is not supported.

[0098] To solve the above problem, referring to FIG5 , an embodiment of the present application provides a wireless power receiving circuit 500 , including: a receiving coil 501 , a matching circuit 505 , a rectifier circuit 504 , a controller 503 , and an output terminal, wherein the rectifier circuit 504 includes at least one switch unit 502 ;

[0099] In the wireless power receiving circuit 500, the receiving coil 501 can be connected to the matching circuit 505 to form an oscillator circuit on the wireless power receiving circuit 500 side. The receiving coil 501 receives power transmitted by the transmitting coil through coil coupling and converts it into alternating current (AC) through the oscillator circuit. The rectifier circuit 504 is connected to the oscillator circuit to receive the AC power output by the oscillator circuit and rectify it to DC power.

[0100] Among them, the rectifier circuit 504 can include an uncontrolled rectifier circuit 504 or a synchronous rectifier circuit 504, the uncontrolled rectifier circuit 504 includes at least one diode, and the synchronous rectifier circuit 504 includes at least one metal oxide semiconductor field effect transistor (metal-oxide-semiconductor field effect transistor, MOSFET), which is not limited to this embodiment of the present application.

[0101] In a possible implementation, the rectifier circuit 504 includes at least one switch unit 502 , which may be a controllable switch unit in a rectifier bridge of the rectifier circuit 504 , or a switch unit connected in parallel to a diode in the rectifier bridge.

[0102] 1. The switch unit may be a switch unit connected in parallel to a diode in a rectifier bridge.

[0103] In one possible implementation, the rectifier circuit 504 includes a rectifier bridge, which includes multiple diodes; wherein each of the switch units is connected in parallel to one of the diodes. For example, the at least one switch unit 502 includes a first switch unit 5021 and a second switch unit 5022, and the multiple diodes include a diode located on an upper tube and a diode located on a lower tube; the first switch unit 5021 and the second switch unit 5022 are both connected in parallel to the diode located on the lower tube. For another example, the at least one switch unit 502 includes a first switch unit 5021 and a second switch unit 5022, and the multiple diodes include a diode located on an upper tube and a diode located on a lower tube; the first switch unit 5021 and the second switch unit 5022 are both connected in parallel to the diode located on the upper tube. For another example, the at least one switch unit 502 includes a first switch unit 5021 and a second switch unit 5022, and the multiple diodes include a diode located on the upper tube and a diode located on the lower tube; the first switch unit 5021 is connected in parallel to the diode located on the lower tube, and the second switch unit 5022 is connected in parallel to the diode located on the upper tube, and there is no direct connection between the first switch unit 5021 and the second switch unit 5022, for example, the first switch unit 5021 is connected in parallel to the diode on the left side of the upper tube, and the first switch unit 5021 is connected in parallel to the diode on the right side of the lower tube, or, the first switch unit 5021 is connected in parallel to the diode on the right side of the upper tube, and the first switch unit 5021 is connected in parallel to the diode on the left side of the lower tube.

[0104] In a possible implementation, the at least one switch unit 502 includes only a first switch unit 5021. For example, the first switch unit 5021 is connected in parallel to the diode on the left side of the upper tube, or the first switch unit 5021 is connected in parallel to the diode on the right side of the upper tube, or the first switch unit 5021 is connected in parallel to the diode on the left side of the lower tube, or the first switch unit 5021 is connected in parallel to the diode on the right side of the lower tube.

[0105] 2. The switch unit may be a controllable switch unit in the rectifier bridge of the rectifier circuit 504 .

[0106] In one possible implementation, the rectifier circuit 504 further includes a rectifier bridge, the rectifier bridge including a plurality of controllable switching transistors including the at least one switching unit 502. For example, the at least one switching unit 502 includes a first switching unit 5021 and a second switching unit 5022, both of which are controllable switching transistors in the upper tube. For another example, the at least one switching unit 502 includes a first switching unit 5021 and a second switching unit 5022, both of which are controllable switching transistors in the lower tube. For another example, the at least one switching unit 502 includes a first switching unit 5021 and a second switching unit 5022, the first switching unit 5021 being the controllable switching transistor on the left side of the lower tube, and the second switching unit 5022 being the controllable switching transistor on the right side of the upper tube, or the first switching unit 5021 being the controllable switching transistor on the left side of the upper tube, and the first switching unit 5021 being the controllable switching transistor on the right side of the lower tube.

[0107] In a possible implementation, the at least one switch unit 502 includes only a first switch unit 5021. For example, the first switch unit 5021 is a controllable switch tube on the left side of the upper tube, or the first switch unit 5021 is a controllable switch tube on the right side of the upper tube, or the first switch unit 5021 is a controllable switch tube on the left side of the lower tube, or the first switch unit 5021 is a controllable switch tube on the right side of the lower tube.

[0108] In one possible implementation, the controller 503 is used to determine the duty cycle of the at least one switching unit 502 based on the output voltage of the voltage output end, and control the opening or closing of the at least one switching unit 502 according to the duty cycle (for example, a modulation signal obtained according to the duty cycle) to adjust the output voltage; wherein the duty cycle is independent of the main frequency of the wireless power receiving circuit 500.

[0109] Since the duty cycle is independent of the main frequency of the wireless power receiving circuit 500 , the duty cycle may not be an integer multiple of the main frequency. Thus, when the output voltage changes continuously, the duty cycle also changes continuously.

[0110] In existing implementations, voltage regulation requires detecting the main frequency, and the determined duty cycle of the switch is an integer multiple of the main frequency, making continuous voltage regulation impossible. In the present application, voltage regulation is achieved without using additional voltage stabilizing components in the hardware structure, and the duty cycle is independent of the main frequency of the wireless power receiving circuit 500. Continuous voltage regulation can be achieved without detecting the main frequency.

[0111] In which, when the number of at least one switch unit 502 is multiple (for example, the above embodiment includes a first switch unit 5021 and a second switch unit 5022), controlling the opening or closing of the at least one switch unit 502 includes: controlling the first switch unit 5021 and the second switch unit 5022 to be opened or closed at the same time.

[0112] It should be understood that when the number of at least one switch unit 502 is one (for example, the above embodiment includes only the first switch unit 5021), the boost regulation range can be up to 2 times, and when the number of at least one switch unit 502 is multiple (for example, the above embodiment includes the first switch unit 5021 and the second switch unit 5022), the boost regulation range can be up to unlimited.

[0113] For example, referring to FIG8 , FIG8 is a schematic diagram of the duty cycle in the modulation signal.

[0114] 6 , an embodiment of the present application further provides a wireless power receiving circuit 500 , including: a receiving coil 501 , a detuning circuit 506 , a rectifier circuit 504 , a controller 503 , and an output terminal. The detuning circuit 506 includes a matching circuit 505 and a grounded target branch. The matching circuit 505 is connected to the target branch. The target branch includes a detuning capacitor and a switch unit 508 .

[0115] In one possible implementation, the matching capacitor includes a first capacitor and a second capacitor, the first capacitor and the second capacitor are located at the first end of the receiving coil 501, and the target branch includes a first branch and a second branch; the first branch includes a first detuning capacitor 5071 and a first switch unit 5081, and the second branch includes a second detuning capacitor 5072 and a second switch unit 5082; the first branch is connected between a node between the first capacitor and the second capacitor and ground, and the second branch is connected between a node located at the second end of the receiving coil 501 and ground.

[0116] The controller 503 is configured to determine a duty cycle of the switch unit according to the output voltage of the voltage output terminal, and control the switching unit to be turned on or off according to the duty cycle to adjust the output voltage; wherein the duty cycle is independent of the main frequency of the wireless power receiving circuit 500.

[0117] This is equivalent to directly connecting a detuned capacitor and a switch tube in series with the matching circuit 505 and the ground, and using the controller 503 to generate a modulation signal S2 independent of the wireless charging main frequency to control the opening and closing of the switch, thereby achieving step-down control.

[0118] Since the duty cycle is independent of the main frequency of the wireless power receiving circuit 500 , the duty cycle may not be an integer multiple of the main frequency. Thus, when the output voltage changes continuously, the duty cycle also changes continuously.

[0119] The embodiments of Figures 5 and 6 above can be combined with each other to achieve the results of buck and boost functions. Referring to Figure 7, specifically, two groups of switches can be added to the original rectifier circuit 504 and matching circuit 505, and a modulation signal S1, S2 independent of the wireless charging operating frequency can be used to achieve voltage regulation. The first group of switches are connected in parallel at both ends of the rectifier diode, and boost control is achieved by controlling the duty cycle d1 of the independent signal S1; the independent signal S1 can also act on the synchronous rectifier switch tube to achieve boost control. The second group of switches are connected in series with a detuned capacitor to ground, and buck control is achieved by controlling the duty cycle d2 of the independent signal S2. Switch devices are connected in parallel to the rectifier diode, and the controller 503 generates a modulation signal S1 independent of the wireless charging main frequency to control the opening and closing of the switch to achieve boost control. The modulation signal can also act directly on the synchronous rectifier switch tube. A detuned capacitor and a switch are directly connected in series between the matching circuit 505 and the ground, and a modulation signal S2 independent of the wireless charging main frequency is generated by the controller 503 to control the on and off of the switch, thereby achieving voltage reduction control.

[0120] The wireless power receiving circuit provided in the embodiments of the present application can be applied to charging equipment, vehicles or portable electronic devices as a receiving end or a transmitting end of electric energy.

[0121] Taking vehicles as an example, with the popularization of vehicles, cars and other vehicles have become an indispensable means of transportation in people's daily lives. However, the development cycle of vehicles is long and the update iteration is slow, making it difficult to meet the diverse and personalized needs of consumers. Consumer electronic products such as mobile phones and watches are convenient for consumers to carry with them. Due to their short life cycle and fast update iteration, they can adapt to rapidly changing scene requirements. Therefore, the ecological integration of the consumer electronics industry and the automotive industry is imperative. In the embodiments of the present application, the wireless power receiving circuit involved above can be applied to vehicles, which is conducive to promoting the practice of installing consumer electronic products in vehicles.

[0122] In some embodiments, the wireless power receiving circuit provided by the embodiments of the present application can be installed in at least one of the following locations: the vehicle's console, seat back, door armrest, center armrest, door interior panel, or trunk. This allows users to conveniently charge in-vehicle ecological devices through the wireless power receiving circuit. In the embodiments of the present application, when the wireless power receiving circuit is installed in a vehicle, it can be electrically connected to the vehicle's power supply circuit, and the energy source for the wireless power receiving circuit is the vehicle. In other words, the wireless power receiving circuit draws energy from the vehicle's power supply circuit and can wirelessly charge other devices.

[0123] In some embodiments, the wireless power receiving circuit provided by the embodiments of the present application can be installed as a pre-installed component in the vehicle. This means that the wireless power receiving circuit is already built into the vehicle as a pre-installed component before the vehicle leaves the factory. This eliminates the need for exposed wires or charging ports to charge onboard ecological devices, improving aesthetics and helping to meet the diverse needs of personalized users.

[0124] In other embodiments, the wireless power receiving circuit provided in the embodiments of the present application is installed in the vehicle via a detachable connection structure, for example, by means of a clamp, a buckle, a thread, a Velcro fastener, or the like. This allows users to conveniently use the wireless power receiving circuit to charge onboard ecological devices at different locations in the vehicle. In some embodiments, the wireless power receiving circuit can be electrically connected to the charging port on the vehicle via a charging connector or by contact.

[0125] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless power receiving circuit, characterized in that, Comprising: A receiving coil, a matching circuit, a rectifying circuit, a controller, and an output terminal, wherein the rectifying circuit includes at least one switching unit; The receiving coil is configured to receive energy and output alternating current; The matching circuit is configured to match the alternating current and then deliver it to the input terminal of the rectifying circuit; The rectifying circuit is configured to convert the input alternating current into direct current; The controller is configured to determine the duty cycle of the at least one switching unit according to the output voltage of the voltage output terminal, and control the turning on or off of the at least one switching unit according to the duty cycle to adjust the output voltage; wherein, the duty cycle has nothing to do with the main frequency of the wireless power receiving circuit.

2. The wireless power receiving circuit according to claim 1, characterized in that The duty cycle is not an integer multiple of the main frequency.

3. The wireless power receiving circuit according to claim 1 or 2, characterized in that, When the output voltage changes continuously, the duty cycle changes continuously at the same time.

4. The wireless power receiving circuit according to any one of claims 1 to 3, characterized in that, The rectifying circuit further includes: a rectifier bridge, the rectifier bridge includes a plurality of diodes; wherein, each switching unit is connected in parallel with one of the diodes.

5. The wireless power receiving circuit according to claim 4, wherein The at least one switching unit only includes a first switching unit.

6. The wireless power receiving circuit according to claim 4, wherein The at least one switching unit includes a first switching unit and a second switching unit, and the plurality of diodes include diodes located on the upper tube and diodes located on the lower tube; The first switching unit and the second switching unit are both connected in parallel with the diode located on the lower tube; or, The first switching unit and the second switching unit are both connected in parallel with the diode located on the upper tube; or, The first switching unit is connected in parallel with the diode located on the lower tube, the second switching unit is connected in parallel with the diode located on the upper tube, and the first switching unit and the second switching unit are not directly connected to each other.

7. The wireless power receiving circuit according to claim 6, wherein, Controlling the turning on or off of the at least one switching unit includes: controlling the first switching unit and the second switching unit to turn on or off simultaneously.

8. The wireless power receiving circuit according to any one of claims 1 to 3, characterized in that, The rectifying circuit further includes: a rectifier bridge, the rectifier bridge includes a plurality of controllable switch tubes including the at least one switching unit.

9. The wireless power receiving circuit according to claim 8, wherein The at least one switching unit only includes a first switching unit.

10. The wireless power receiving circuit according to claim 8 or 9, characterized in that, The at least one switching unit includes a first switching unit and a second switching unit, wherein, The first switching unit and the second switching unit are both controllable switch tubes of the lower tube; or, The first switching unit and the second switching unit are both controllable switch tubes of the upper tube; or, The first switching unit is a controllable switch tube of the lower tube, the second switching unit is a controllable switch tube of the upper tube, and the first switching unit and the second switching unit are not directly connected to each other.

11. The wireless power receiving circuit according to claim 10, wherein Controlling the turning on or off of the at least one switching unit includes: controlling the first switching unit and the second switching unit to turn on or off simultaneously.

12. A wireless power receiving circuit, characterized in that, Comprising: A receiving coil, a detuning circuit, a rectifying circuit, a controller, and an output terminal, the detuning circuit includes a matching circuit and a target branch grounded, the matching circuit is connected to the target branch, and the target branch includes a detuning capacitor and a switching unit; The receiving coil is configured to receive energy and output alternating current; The rectifying circuit is configured to convert the input alternating current into direct current; The controller is configured to determine the duty cycle of the switching unit according to the output voltage of the voltage output terminal, and control the switching-on or switching-off of the switching unit according to the duty cycle to adjust the output voltage; wherein, the duty cycle is independent of the main frequency of the wireless power receiving circuit.

13. The wireless power receiving circuit according to claim 12, characterized in that, The duty cycle is not an integer multiple of the main frequency.

14. The wireless power receiving circuit according to claim 12 or 13, characterized in that, When the output voltage changes continuously, the duty cycle changes continuously at the same time.

15. The wireless power receiving circuit according to any one of claims 12 to 14, characterized in that, The matching capacitor includes a first capacitor and a second capacitor. The first capacitor and the second capacitor are located at the first end of the receiving coil. The target branch includes a first branch and a second branch. The first branch includes a first detuning capacitor and a first switching unit. The second branch includes a second detuning capacitor and a second switching unit. The first branch is connected between the node between the first capacitor and the second capacitor and the ground. The second branch is connected between the node at the second end of the receiving coil and the ground.

16. The wireless power receiving circuit according to claim 15, characterized in that, Controlling the switching-on or switching-off of the switching unit includes: controlling the first switching unit and the second switching unit to switch on or off simultaneously.

17. A wireless charging device, characterized in that, Comprising the wireless power receiving circuit according to any one of claims 1 to 16 and an energy storage device; The wireless power receiving circuit is configured to receive electric energy and transmit the electric energy to the energy storage device.

18. A charging system, characterized in that, Comprising the wireless charging device and the wireless power supply device according to claim 17; The transmitting coil included in the wireless power supply device is configured to transmit energy to the wireless charging device.

19. A control method for wireless charging, characterized in that, Applied to the receiving end of wireless charging, the receiving end includes: a receiving coil, a matching circuit, a rectifying circuit, a controller and an output terminal. The rectifying circuit includes at least one switching unit; The method includes: Determining the duty cycle of the at least one switching unit according to the output voltage of the voltage output terminal, and controlling the switching-on or switching-off of the at least one switching unit according to the duty cycle to adjust the output voltage; wherein, the duty cycle is independent of the main frequency of the wireless power receiving circuit.

20. The method according to claim 19, wherein The duty cycle is not an integer multiple of the main frequency.

21. The method according to claim 19 or 20, characterized in that, When the output voltage changes continuously, the duty cycle changes continuously at the same time.

22. A control method for wireless charging, characterized in that, Applied to the receiving end of wireless charging, the receiving end includes: a receiving coil, a detuning circuit, a rectifying circuit, a controller and an output terminal. The detuning circuit includes a matching circuit and a grounded target branch. The matching circuit is connected to the target branch. The target branch includes a detuning capacitor and a switching unit; The method includes: Determining the duty cycle of the switching unit according to the output voltage of the voltage output terminal, and controlling the switching-on or switching-off of the switching unit according to the duty cycle to adjust the output voltage; wherein, the duty cycle is independent of the main frequency of the wireless power receiving circuit.

23. The method according to claim 22, characterized in that, The duty cycle is not an integer multiple of the main frequency.

24. The method according to claim 22 or 23, characterized in that, When the output voltage changes continuously, the duty cycle changes continuously at the same time.

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