CN117811227A - Wireless power supply circuit, wireless power supply device, and circuit control method - Google Patents

Abstract

The application discloses a wireless power supply circuit, wireless power supply equipment and a circuit control method. The wireless power supply circuit comprises a power supply module, a voltage adjusting module, a switch module, a resonance module and a control module. The voltage adjusting module is connected between the power module and the switch module, the resonance module comprises a resonance capacitor module and a resonance inductor module, and the resonance capacitor module and the resonance inductor module are connected in series and then connected to the switch module; the resonance capacitor module comprises a plurality of resonance capacitors, and when the resonance module is in a working state, at least one resonance capacitor is in a conducting state; the control module is connected with the voltage adjustment module and is configured to control the voltage adjustment module to adjust the output voltage of the power supply module based on the working parameters of the wireless power supply circuit. The wireless power supply circuit can automatically adjust the output voltage based on the working parameters, so that the output voltage can be matched with an external load to be charged.

Description

Wireless power supply circuit, wireless power supply device, and circuit control method

Technical Field

The present application relates to the field of power electronics, and more particularly, to a wireless power supply circuit, a wireless power supply device, and a circuit control method.

Background

In the existing wireless power supply circuit, high-power supply generally adopts a high-voltage and current reduction scheme, so that the loss of a power device is reduced. The low-power supply (such as charging) generally adopts low voltage, so that the corresponding power supply device has small volume and simple circuit.

When a wireless power supply device needs to have high-power supply and low-power supply at the same time, two independent power supply systems are generally required to be designed, and the circuit hardware cost is high. In addition, when the user uses the wireless power supply device, the user needs to subjectively select whether the wireless power supply device is in a high-power supply mode or a low-power supply mode, and certain trouble is caused to the daily use of the user.

Disclosure of Invention

The embodiment of the application provides a wireless power supply circuit, wireless power supply equipment and a circuit control method.

In a first aspect, some embodiments of the present application provide a wireless power supply circuit, comprising: the device comprises a power supply module, a voltage adjusting module, a switch module, a resonance module and a control module. The voltage adjusting module is connected to the power module and used for adjusting the output voltage of the power module. The switch module is connected to the voltage adjusting module. The resonance module comprises a resonance capacitor module and a resonance inductor module, and the resonance capacitor module and the resonance inductor module are connected in series and then connected to the switch module. The resonant capacitor module comprises a plurality of resonant capacitors, at least one resonant capacitor is in a conducting state when the resonant module is in a working state, and working parameters of the wireless power supply circuit are different under the condition that different resonant capacitors are in the conducting state. The control module is connected with the voltage adjustment module and is configured to control the voltage adjustment module to adjust the output voltage of the power supply module based on the working parameters of the wireless power supply circuit.

In a second aspect, some embodiments of the present application further provide a wireless power supply apparatus, including: the wireless power supply circuit is arranged in the shell.

In a third aspect, some embodiments of the present application further provide a circuit control method, where the method is applied to the wireless power supply circuit described above, and the method includes: acquiring working parameters of a wireless power supply circuit, wherein the working parameters comprise at least one of resonant current and working efficiency; determining an operating voltage of the power module based on the operating parameter; the control voltage adjusting module adjusts the output voltage of the power supply module to the working voltage.

The application provides a wireless power supply circuit, wireless power supply equipment and circuit control method, in the wireless power supply circuit, voltage adjustment module is connected in power module for adjust power module's output voltage, and switch module connects between voltage adjustment module and resonance module, and resonance module includes resonance capacitance module and resonance inductance module, and wherein, resonance capacitance module includes a plurality of resonance electric capacity to when resonance module is in operating condition, at least one resonance electric capacity is in the conduction state. Specifically, under the condition that different resonance capacitors are in a conducting state, the working parameters of the wireless power supply circuit are different. The control module is connected to the voltage adjustment module and is configured to adjust the output voltage of the power supply module based on the operating parameter of the wireless power supply circuit. For example, when the working parameter characterizes that the external load to be charged is a low-power load, the control module reduces the output voltage of the power supply module, so that the wireless power supply circuit enters a low-power supply mode. Otherwise, when the working parameter represents that the external load to be charged is a high-power load, the control module increases the output voltage of the power supply module, so that the wireless power supply circuit enters a high-power supply mode. That is, the wireless power supply circuit in the application can automatically adjust the output voltage based on the working parameters, so that the output voltage can be matched with an external load to be charged, and therefore, a user does not need to subjectively judge whether the wireless power supply circuit is in a high-power supply mode or a low-power supply mode, and the using trouble of the user is avoided.

In addition, a plurality of resonance capacitors included in the resonance capacitor module share the same switch module and control module, multiplexing of a high-power supply circuit and a low-power supply circuit is achieved, a circuit structure is simplified, and hardware cost of the wireless power supply circuit is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a wireless power supply device provided in the present application.

Fig. 2 is a schematic diagram of a wireless power supply circuit in the wireless power supply apparatus shown in fig. 1.

Fig. 3 is a schematic diagram of another configuration of a wireless power supply circuit in the wireless power supply apparatus shown in fig. 1.

Fig. 4 is a schematic diagram of still another configuration of a wireless power supply circuit in the wireless power supply apparatus shown in fig. 1.

Fig. 5 is a schematic flow chart of a circuit control method provided in the present application.

Detailed Description

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The wireless power supply circuit, the wireless power supply device and the circuit control method proposed in the present application will be further described with reference to the detailed description and the accompanying drawings.

Referring to fig. 1, the embodiment of the present application provides a wireless power supply circuit 100 and a wireless power supply apparatus 200 configured with the wireless power supply circuit 100. The wireless power supply apparatus 200 may be a wireless charging apparatus (e.g., a wireless charger). In the embodiment of the present application, the wireless power supply apparatus 200 refers to an apparatus having both a high-power supply function and a low-power supply function. The wireless power supply circuit 100 is provided in the wireless power supply apparatus 200 for switching between a high-power supply function and a low-power supply function. Specifically, when the wireless power supply circuit 100 is in a high-power supply function, power is supplied to an external high-power load (e.g., a wireless cleaner). Conversely, when the wireless power supply circuit 100 is in a low power supply function, power is supplied to an external low power load (e.g., a wireless juice extractor cup).

In the embodiment of the present application, the wireless power supply apparatus 200 includes the housing 210, the function panel 230, and the wireless power supply circuit 100 described above. The functional panel 230 is disposed on an outer surface of the housing 210, and is configured to receive a control operation of a user, and the wireless power supply circuit 100 is disposed inside the housing 210 and electrically connected to the functional panel 230, so as to implement a function corresponding to the control operation according to different control operations received by the functional panel 230.

In the present embodiment, the housing 210 includes a first housing 212 and a second housing 214, and the first housing 212 and the second housing 214 are covered with each other to form an accommodating space for the wireless power supply circuit 100, that is, the housing 210 plays a role in protecting and accommodating the components in the wireless power supply circuit 100. The first housing 212 is provided with a fixing structure therein, and the fixing structure is used for fixing a part of the structure (for example, a circuit motherboard) of the wireless power supply circuit 100. Specifically, the securing structure includes, but is not limited to, a securing slot, a clip (e.g., a resilient clip), and the like. The outer surface of the second housing 120 is provided with a mounting groove for mounting the functional panel 230.

The functional panel 230 is mounted to the outer surface of the second housing 120, and in particular, the functional panel 230 may include a plurality of functional switches, for example, a power switch, a power supply timing switch, and the like. In some embodiments, the function switches may also include a high power supply function switch and a low power supply function switch, i.e., the user may manually switch the high power supply function and the low power supply function in the wireless power supply circuit 100 by operating the function panel 230. Specifically, when the function panel 230 receives a control operation of a user, the control operation is converted into a corresponding electrical signal, and the electrical signal is transmitted to the wireless power supply circuit 100 electrically connected to the function panel 230. In a subsequent process, the wireless power supply circuit 100 switches the corresponding function based on the electrical signal, for example, the electrical signal is sent by a low-power supply function switch, and the wireless power supply circuit 100 switches to the low-power supply function.

Referring to fig. 2 to 4, the wireless power supply circuit 100 includes a power module 10, a voltage adjustment module 30, a switch module 50, a resonance module 70, and a control module 90. The voltage adjusting module 30 is connected between the power module 10 and the switch module 50, and is used for adjusting the output voltage of the power module 10. The resonance module 70 is connected to the switching module 50, wherein the switching module 50 is used for closing or opening a branch between the voltage regulation module 30 and the resonance module 70, i.e. for controlling whether the resonance module 70 is in an operating state. In the embodiment of the present application, the resonance module 70 includes a resonance capacitance module 710 and a resonance inductance module 730, and the resonance capacitance module 710 and the resonance inductance module 730 are connected to the switch module 50 in series with each other. Specifically, the resonant capacitor module 710 includes a plurality of resonant capacitors 7110, and when the resonant module 70 is in an operating state, at least one resonant capacitor 7110 is in a conductive state. In this application, the operating parameters of the wireless power supply circuit 100 are different when different resonant capacitors 7110 are in a conductive state. The control module 90 is connected to the voltage adjustment module 30 and configured to adjust the output voltage of the power module 10 based on the operating parameters of the wireless power supply circuit 100.

In an embodiment of the present application, the operating parameter includes at least one of a resonant current and an operating efficiency. When the resonant current is less than or equal to the specified current threshold, or/and the working efficiency is less than or equal to the specified efficiency threshold, the external load to be charged is a low-power load, and the control module 90 reduces the output voltage of the power module 10, so that the wireless power supply circuit 100 enters the low-power supply mode. Otherwise, the external load to be charged is a high-power load, and the control module 90 controls the wireless power supply circuit 100 to enter the high-power supply mode. In particular, the specific implementation of the control module 90 to adjust the output voltage of the power module 10 based on the operating parameters is described in detail in the method embodiments below.

The wireless power supply circuit 100 in the application can automatically adjust the output voltage based on the working parameters, so that the output voltage can be matched with an external load to be charged. Therefore, the user does not need to subjectively judge whether the wireless power supply circuit 100 is in the high-power supply mode or the low-power supply mode, and the trouble of using the wireless power supply circuit by the user is avoided. In addition, the resonant capacitors 7110 included in the resonant capacitor module 710 in the present application share the same switch module 50 and control module 90, so as to implement multiplexing of the high-power supply circuit and the low-power supply circuit, simplify the circuit structure, and reduce the hardware cost of the wireless power supply circuit 100.

Each module in the wireless power supply circuit 100 provided in the embodiment of the present application is described below.

The power module 10 provides power to the resonance module 70. Specifically, the power supply module 10 includes an ac power supply module 120 and a filter circuit module 140. The filter circuit module 140 is connected between the ac power module 120 and the voltage adjustment module 30. In the embodiment of the present application, the ac power module 120 is an ac power output module. Specifically, the ac power module 120 outputs ac power at 220V and 50Hz.

The filtering circuit module 140 is connected to the ac power module 120, and is configured to filter the ac power output by the ac power module 120 and suppress noise interference in the ac power. Specifically, in the embodiment shown in fig. 3, the filter circuit module 140 includes a fuse FU, a varistor RZ, a common-mode inductance L1, a matching capacitor C1, and a matching capacitor C2. The piezoresistor RZ is connected in parallel to two ends of the ac power module 120, and is used for stabilizing the output voltage of the ac power module 120, so as to avoid the occurrence of abnormal and excessively high voltage fluctuation of the output voltage. The fuse FU is connected in series in a loop formed by the ac power module 120 and the varistor RZ, and is used to fuse the branch when the current value of the ac exceeds a predetermined value, thereby protecting the back-end load. The input end of the common-mode inductor L1 is connected in parallel with the two ends of the piezoresistor RZ, and the output end of the common-mode inductor L1 is connected with the voltage adjusting module 30 and is used for inhibiting common-mode interference in output voltage. The matching capacitor C1 and the matching capacitor C2 are respectively connected in parallel with the input end and the output end of the common mode inductor L1, and are used for further improving the suppression effect on common mode interference.

The voltage adjusting module 30 is connected between the power module 10 and the switch module 50 for adjusting the output voltage of the power module 10. In the embodiment shown in fig. 3, the voltage adjustment module 30 is connected between the filtering circuit module 140 and the switching module 50, and is used for adjusting the voltage of the alternating current filtered by the filtering circuit module 140.

In some embodiments, the voltage adjustment module 30 includes a plurality of voltage output modules 310 and a voltage switching module 320. The voltage output modules 310 are connected in parallel to the voltage output terminals of the filter circuit module 140. In this embodiment, each voltage output module 310 can independently adjust the output voltage of the filter circuit module 140, and output the adjusted voltage through the voltage output terminal on the voltage output module 310. Wherein the voltage output by the plurality of voltage output modules 310 is different from each other in magnitude. The voltage switching module 320 is connected between the plurality of voltage output modules 310 and the switching module 50, and is configured to switch output voltages of the plurality of voltage output modules 310, so that at least one voltage output module 310 and the switching module 50 are in a conductive state when the wireless power supply circuit 100 is in an operating state. Therefore, in the present application, in the case that the operation voltage of the power module 10 is determined based on the operation parameters of the wireless power supply circuit 100, the output voltages of the plurality of voltage output modules 310 may be switched by controlling the voltage switching module 320, so that the output voltage of the power module 10 can be matched with the external load to be charged.

In the embodiment shown in fig. 3, the number of the voltage output modules 310 is two, namely, the first voltage output module 3100 and the second voltage output module 3120, wherein the first voltage output by the first voltage output module 3100 is greater than the second voltage output by the second voltage output module 3120.

Specifically, the first voltage output module 3100 is a rectifying circuit, and is configured to rectify the ac power filtered by the filtering circuit sub-module 140, that is, convert the ac power into dc power. The positive voltage output end of the rectifying circuit is connected to the voltage switching module 320, and the negative voltage output end is grounded. Specifically, the rectifying circuit may be implemented by a rectifying bridge, or a dedicated rectifying chip, which is not specifically limited in this application. Here, since the voltage of the ac power outputted from the ac power module 120 is 220V, the first voltage outputted after rectification by the rectification circuit is 310V (i.e., high voltage), and when the voltage switching module 320 turns on the branch between the first voltage output module 3100 and the switching module 50, the wireless power supply circuit 100 is in the high-power supply mode.

The second voltage output module 3120 is a voltage-reducing circuit for reducing the output voltage of the filtering circuit sub-module 140, and in addition, the voltage-reducing circuit in the embodiment of the present application has a rectifying function, that is, the output voltage of the voltage-reducing circuit is dc low voltage, where the voltage output end of the voltage-reducing circuit is connected to the voltage switching module 320. Specifically, the step-down circuit may be a self-excited serial power adapter, a switching power supply, etc., and the specific implementation of the step-down circuit is not limited in this application. Here, the second voltage outputted after being stepped down by the step-down circuit is a voltage value (i.e., a low voltage) of less than 50V, and specifically, the second voltage may be a voltage value of 12V, 24V, or the like according to different implementations of the step-down circuit. When the voltage switching module 320 turns on the branch between the second voltage output module 3120 and the switching module 50, the wireless power supply circuit 100 is in the low power supply mode.

In some embodiments, the voltage output terminal of the second voltage output module 3120 is further connected to the control module 90, that is, the second voltage output module 3120 supplies power to the control module 90 while supplying power to the resonance module 70, so that the output power of the second voltage output module 3120 is effectively utilized. In addition, the wireless power supply circuit 100 does not need to be provided with a device for supplying power to the control module 90, so that the overall structure of the wireless power supply circuit 100 is simpler and more compact.

The voltage switching module 320 includes a plurality of voltage selection terminals 3210 and a voltage connection terminal 3230, the plurality of voltage selection terminals 3210 are connected to the voltage output terminals of the plurality of voltage output modules 310 in a one-to-one correspondence, and the voltage connection terminal 3230 is connected to the switching module 50. In particular, the voltage switching module 320 may be a multiplexing switch. In the embodiment shown in fig. 3, the voltage switching module 320 is a two-way selection switch, and the two-way selection switch includes two voltage selection terminals 3210, where the two voltage selection terminals 3210 are a first voltage selection terminal 3212 and a second voltage selection terminal 3214. Specifically, the first voltage selection terminal 3212 is connected to the positive voltage output terminal of the first voltage output module 3100, and the second voltage selection terminal 3214 is connected to the voltage output terminal of the second voltage output module 3120. That is, when the first voltage selection terminal 3212 is turned on, the wireless power supply circuit 100 is in a high-power supply mode; when the second voltage selection terminal 3214 is turned on, the wireless power supply circuit 100 is in a low-power supply mode. In some embodiments, the voltage switching module 320 further includes a first selection control terminal (not shown), and the voltage switching module 320 is electrically connected to the control module 90 through the first selection control terminal, and switches the branch where the first voltage selection terminal 3212 and the second voltage selection terminal 3214 are located under the control of the control signal sent by the control module 90.

In some embodiments, the voltage adjusting module 30 further includes a first filter capacitor C3, where one end of the first filter capacitor C3 is connected to the voltage connection end 3230 of the voltage switching module 320, and the other end is grounded, so as to further smooth the dc voltages output by the voltage output modules 310, so that the subsequent resonant module 70 is more stable during operation.

In other embodiments, referring to fig. 4, the voltage adjustment module 30 in fig. 4 includes a voltage adjustment module 330, and the voltage adjustment module 330 is connected between the power module 10 and the switch module 50. Specifically, the voltage regulating module 330 is connected between the filter circuit module 140 and the switch module 50, and is used for regulating the output voltage of the filter circuit module 140. In this embodiment, the voltage regulating module 330 further includes a control end 3300, and is connected to the control module 90 through the control end 3300, and dynamically adjusts the output voltage of the filter circuit module 140 under the control of the voltage adjusting signal sent by the control module 90. Specifically, the voltage regulating module 330 may be implemented by a voltage regulating circuit or a voltage regulating chip, which is not limited in this application. According to the voltage regulation method and device, the voltage is regulated through the voltage reduction module, so that the regulated voltage can be changed within a voltage interval range, and the output voltage value is more flexible.

In some embodiments, the voltage adjustment module 30 further includes a rectifying circuit module 340, where the rectifying circuit module 340 is connected between the filtering circuit module 140 and the voltage regulation module 330, and is used for rectifying the output voltage of the filtering circuit module 140, that is, the input voltage of the voltage regulation module 330 is a dc voltage. Specifically, the rectifying circuit module 340 may be implemented by a rectifying bridge, or a dedicated rectifying chip, which is not specifically limited in this application. Accordingly, the voltage regulating module 330 performs a function of regulating the dc voltage, and accordingly, the voltage regulating module 330 may be a step-down chopper circuit (e.g., a BUCK circuit).

In some embodiments, the voltage adjustment module 30 further includes a second filter capacitor C4, where the second filter capacitor C4 is connected in parallel to the voltage output terminal of the voltage regulation module 330, and one end of the second filter capacitor C4 connected to the negative voltage output terminal of the voltage regulation module 330 is grounded. The second filter capacitor C4 is used for further smoothing the dc voltage output by the voltage regulating module 330, so that the subsequent resonant module 70 is more stable during operation.

In the present embodiment, the switching module 50 includes a first switch 520, a second switch 540, a third switch 560, and a fourth switch 580. The first switch 520 and the second switch 540 are connected in series with each other and then connected to the voltage output terminal of the voltage adjustment module 30, and the third switch 560 and the fourth switch 580 are connected in series with each other and then connected to the voltage output terminal of the voltage adjustment module 30. In the embodiment shown in fig. 3, one end of the first switch 520 and the second switch 540 connected in series with each other is connected to the circuit connection end 3230 of the voltage switching module 320, and the other end is grounded. Similarly, one end of the third switch 560 and the fourth switch 580 connected in series with each other is connected to the circuit connection end 3230 of the voltage switching module 320, and the other end is grounded. In the embodiment shown in fig. 4, the first switch 520 and the second switch 540 are connected in series and then connected in parallel to the voltage output terminal of the voltage regulating module 330, where the end of the second switch 540 far from the first switch 520 is grounded. Likewise, the third switch 560 and the fourth switch 580 are connected in series and then connected in parallel to the voltage output terminal of the voltage regulating module 330, wherein the end of the fourth switch 580 far from the third switch 560 is grounded. That is, the switch module 50 in the embodiment of the application is a full-bridge circuit, and has the advantages of high output power and high working efficiency. Specifically, the first switch 520, the second switch 540, the third switch 560 and the fourth switch 580 in the embodiment of the present application are all power switch tubes, where the power switch tubes may be insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBTs), and the specific model of the power switch tubes is not limited in the present application.

In some embodiments, the switch module 50 further includes a first capacitor C5, a second capacitor C6, a third capacitor C7, and a fourth capacitor C8, where the first capacitor C5, the second capacitor C6, the third capacitor C7, and the fourth capacitor C8 are connected in parallel with the first switch 520, the second switch 540, the third switch 560, and the fourth switch 580 in a one-to-one correspondence, that is, the first capacitor C5 is connected in parallel to two sides of the first switch 520, which can play a role of reducing the loss of the first switch 520. Specifically, when the first switch 520 is turned off, the first switch 520 may form a voltage spike, and the parallel connection of the first capacitor C5 may play a better role in inhibiting the voltage spike, so as to ensure the service life of the first switch 520. Likewise, the second capacitor C6, the third capacitor C7 and the fourth capacitor C8 can respectively play a better role in inhibiting voltage spikes formed by the second switch 540, the third switch 560 and the fourth switch 580 when being turned off, so that the service lives of the second switch 540, the third switch 560 and the fourth switch 580 are ensured.

In the embodiment of the present application, the resonance module 70 is connected to the switching module 50, and includes a resonance capacitor module 710, a resonance inductor module 730, and a branch selection module 750 connected in series with each other. The resonant capacitor module 710 includes a plurality of resonant capacitors 7110, where the plurality of resonant capacitors 7110 are connected in parallel between the branch selection module 750 and the resonant inductor module 730, and capacitance values of the plurality of resonant capacitors 7110 are different from each other, that is, when the different resonant capacitors 7110 are in a conducting state, working parameters of the wireless power supply circuit 100 are different, specifically, when the resonant capacitor 7110 with a larger capacitance value is conducting, the power supply of the wireless power supply circuit 100 is larger. Therefore, the wireless power supply circuit 100 in the embodiment of the present application can implement the conversion of the power supply by switching the resonance capacitor 7110.

Referring to fig. 3, the resonant capacitor module 710 in fig. 3 includes two resonant capacitors 7110, namely a first resonant capacitor 7112 and a second resonant capacitor 7114, wherein the capacitance of the first resonant capacitor 7112 is greater than the capacitance of the second resonant capacitor 7114. Specifically, the first resonant capacitor 7112 is a voltage-resistant capacitor, and when the first resonant capacitor 7112 is in a conducting state, the wireless power supply circuit 100 is in a high-power supply mode, and at this time, the first voltage output module 3100 is conducted to supply power to the resonant module 70. When the second resonant capacitor 7114 is in a conductive state, the wireless power supply circuit 100 is in a low-power supply mode, and at this time, the second voltage output module 3120 is conductive to supply power to the resonant module 70.

The resonant inductor module 730 and the resonant capacitor module 710 form a series resonant circuit that provides power to an external load to be charged. Specifically, one end of the resonant capacitor module 710, which is far away from the branch selection module 750, is connected to one end of the resonant inductor module 730, and the other end of the resonant inductor module 730 is connected to a common connection end of the third switch 560 and the fourth switch 580.

In some embodiments, the resonant inductor module 730 includes a resonant inductor 7310, where a common connection terminal is formed at an end of the plurality of resonant capacitors 7110 away from the branch selection module 750 and is connected to one end of the resonant inductor 7310, and another end of the resonant inductor 7310 is connected to a common connection terminal of the third switch 560 and the fourth switch 580. The resonant inductor 7310 in the embodiment of the present application is a common inductor, which reduces the hardware cost of the wireless power supply circuit 100.

Specifically, in the embodiment shown in fig. 3, the end of the first resonant capacitor 7112 and the end of the second resonant capacitor 7114 away from the branch selection module 750 form a common connection terminal connected to one end of the resonant inductor 7310, and the other end of the resonant inductor 7310 is connected to the common connection terminal of the third switch 560 and the fourth switch 580. Here, the resonant inductor 7310 in fig. 3 forms a series resonant circuit with each of the first resonant capacitor 7112 and the second resonant capacitor 7114, and the hardware parameters of the first resonant capacitor 7112, the second resonant capacitor 7114 and the resonant inductor 7310 are not limited in this application.

In other embodiments, the resonant inductor module 730 includes a plurality of resonant inductors 7310, the plurality of resonant inductors 7310 are connected to one end of the plurality of resonant capacitors 7110 away from the branch selection module 750 in a one-to-one correspondence manner, and the end of the plurality of resonant inductors 7310 away from the resonant capacitors 7110 forms a common connection terminal connected to the common connection terminals of the third switch 560 and the fourth switch 580. By arranging the plurality of resonant inductors 7310 in one-to-one correspondence with the resonant capacitors 7110, the working efficiency of each resonant capacitor 7110 and the corresponding resonant inductor 7310 is higher when a series resonant circuit is formed.

Specifically, in the embodiment shown in fig. 4, the resonant inductor module 730 includes two resonant inductors 7310, a first resonant inductor 7312 and a second resonant inductor 7314, respectively. One end of the first resonant inductor 7312 is connected to one end of the first resonant capacitor 7112 away from the branch selection module 750, and forms a series resonant circuit with the first resonant capacitor 7112, and the other end of the first resonant inductor 7312 is connected to a common connection end of the third switch 560 and the fourth switch 580. One end of the second resonant inductor 7314 is connected to an end of the second resonant capacitor 7114 away from the branch selection module 750, and forms a series resonant circuit with the second resonant capacitor 7114, and the other end of the second resonant inductor 7314 is connected to a common connection end of the third switch 560 and the fourth switch 580. Here, since the capacitance value of the first resonant capacitor 7112 is greater than the capacitance value of the second resonant capacitor 7114, the inductance value of the first resonant inductor 7312 is smaller than the inductance value of the second resonant inductor 7314, and the hardware parameters of the first resonant capacitor 7112, the second resonant capacitor 7114, the first resonant inductor 7312 and the second resonant inductor 7314 are not limited in this application.

In the embodiment of the present application, the branch selection module 750 is connected between the switch module 50 and the resonance capacitor module 710, and is configured to switch the plurality of resonance capacitors 7110, so that at least one resonance capacitor 7110 is in a conductive state. Specifically, the branch selection module 750 includes a connection terminal 7500 and a plurality of selection terminals 7520, the plurality of selection terminals 7520 are connected to the plurality of resonance capacitors 7110 in a one-to-one correspondence, the connection terminal 7500 is connected to a common connection terminal of the first switch 520 and the second switch 540, and in particular, the branch selection module 750 may be a multiplexing switch. In the embodiment shown in fig. 3, the branch selection module 750 is a two-way selection switch, and the two-way selection switch includes two selection terminals 7520, and the two selection terminals 7520 are respectively connected to the first resonant capacitor 7112 and one end of the second resonant capacitor 7114 away from the resonant inductor module 730. In some embodiments, the branch selection module 750 further includes a second selection control terminal (not shown), and the branch selection module 750 is electrically connected to the control module 90 through the second selection control terminal, and switches the branch where the first resonant capacitor 7112 and the second resonant capacitor 7114 are located under the control of the control signal sent by the control module 90.

In the embodiment of the present application, the control module 90 may be a control chip, an integrated circuit board, or the like. In one aspect, the control module 90 may be electrically connected to the functional panel 230 for acquiring an electrical signal sent by the functional panel 230. On the other hand, the control module 90 controls the switching module 50 to be turned on or off based on the above-described electrical signal. It should be noted that, in the embodiment of the present application, the switch module 50 is a full-bridge circuit, when the control module 90 controls the switch module 50 to be turned on or turned off, the first switch 520 and the fourth switch 580 are complementarily turned on with the second switch 540 and the third switch 560, that is, when the first switch 520 and the fourth switch 580 are turned on, the second switch 540 and the third switch 560 are turned off; when the second switch 540 and the third switch 560 are closed, the first switch 520 and the fourth switch 580 are open. In yet another aspect, the wireless power supply circuit 100 further includes a parameter detection module (not shown in the figure), and the parameter detection module is electrically connected to the control module 90, for obtaining an operating parameter in the wireless power supply circuit 100. The control module 90 further adjusts the output voltage of the power module 10 and switches the plurality of resonance capacitors 7110 in the resonance capacitor module 710 based on the operating parameters. In particular, a specific implementation of the control module 90 for adjusting the output voltage is described in the method embodiments below.

It should be noted that, the parameter detecting module in the present application includes a first current detecting module, which is connected in series with the resonant inductor module 730, and is configured to obtain a resonant current (i.e. an operating parameter) of the resonant module 70 when in operation. In other embodiments, the parameter detecting module includes a second current detecting module, and the second current detecting module is connected to the voltage output end of the voltage adjusting module 30 and is configured to obtain the output current of the voltage adjusting module 30. The control module 90 may determine the operating efficiency (i.e., operating parameters) of the wireless power supply circuit 100 based on the ratio of the output current to the resonant current. Specifically, the first current detection module and the second current detection module may be implemented by a current detection circuit, respectively, without limitation in the present application.

In some embodiments, the wireless power supply circuit 100 further includes a driving module 80, where an input end of the driving module 80 is connected to the control module 90, and an output end of the driving module 80 is connected to the switch module 50, the second selection control end of the branch selection module 750, the first selection control end of the voltage switching module 320, or the control end 3300 of the voltage regulation module 330, respectively. The driving module 80 is configured to generate a corresponding pulse signal to control the switching module 50 to be turned on or off, switch the plurality of resonant capacitors 7110 in the resonant capacitor module 710, and adjust the output voltage of the power module 10 when receiving the control signal sent by the control module 90. Specifically, the driving module 80 may be a driving chip, an integrated circuit board, or the like, which is not particularly limited in this application.

Referring to fig. 5, fig. 5 schematically illustrates a circuit control method provided in an embodiment of the present application, which is applied to the above-mentioned wireless power supply circuit. Specifically, the method may include the following steps S510 to S530.

Step S510, acquiring an operating parameter of the wireless power supply circuit.

In an embodiment of the present application, the operating parameter includes at least one of a resonant current and an operating efficiency. The resonant current is the current at the resonant module. The control module can determine the magnitude of the resonant current by acquiring the current value detected by the first current detection module connected in series with the resonant inductance module. The working efficiency represents the ratio between the output power of the voltage adjusting module and the resonance power of the resonance module in the wireless power supply circuit, and as the output voltage of the voltage adjusting module is the same as the resonance voltage of the resonance module, the working efficiency can be determined by calculating the ratio between the output current of the voltage adjusting module and the resonance current, wherein the control module can determine the magnitude of the output current by acquiring the current value detected by the second current detecting module connected to the voltage output end of the voltage adjusting module.

In some embodiments, the control module obtains an operating parameter of the wireless power supply circuit in a powered-on state. It should be noted that, before the control module obtains the working parameters of the wireless power supply circuit, the control module needs to control the wireless power supply circuit to be in a high-power supply mode, so as to avoid the situation that the deviation exists in the obtained working parameters and then the wrong power supply mode is determined.

Step S520, determining an operating voltage of the power module based on the operating parameter.

In the embodiment of the application, a working voltage mapping relation is stored in a memory of the control module, and the working voltage mapping relation represents a corresponding relation between working parameters and working voltages. Specifically, the working voltage mapping relationship may be a mapping function or a mapping table, which is not limited in this application. The control module can determine the working voltage of the power supply module corresponding to the working parameters based on the working voltage mapping relation.

Specifically, in some embodiments, the operating parameter includes a resonant current. The larger the resonance current is, the larger the power of the external load to be charged is, at this time, the wireless power supply circuit is switched to the high-power supply mode, otherwise, the wireless power supply circuit is switched to the low-power supply mode, and in particular, step S520 may include steps S5210 to S5230.

In step S5210, if the resonant current is greater than the specified current threshold, the operating voltage of the power module is determined to be the first voltage.

In step S5230, if the resonant current is less than or equal to the specified current threshold, the operating voltage of the power module is determined to be the second voltage.

The appointed current threshold is a default value in the control module, and a researcher can also adjust the appointed current threshold according to the working condition of the wireless power supply device. Specifically, the current threshold is specified as a current value smaller than 0.3A, for example, the current threshold is specified as 0.22A.

In an embodiment of the present application, the second voltage is less than the first voltage. Wherein the specific voltage values of the first voltage and the second voltage are determined by specific hardware parameters of the voltage adjustment module. Illustratively, in some embodiments, the voltage adjustment module includes a first voltage output module and a second voltage output module, where the output voltage of the first voltage output module is 310V and the output voltage of the second voltage output module is 24V, the first voltage may be correspondingly set to 310V and the second voltage is 24V. In other embodiments, the voltage adjustment module includes a voltage adjustment module, where the output voltage of the voltage adjustment module is a voltage interval, and the values of the first voltage and the second voltage may be any two voltage values in the voltage interval, for example, the first voltage is an upper limit value of the output voltage, and the second voltage is a lower limit value of the output voltage.

In some embodiments, the operating parameter includes operating efficiency. The greater the working efficiency, the greater the power of the external load to be charged, and at this time, the wireless power supply circuit is switched to the high-power supply mode, and vice versa, the step S520 may include steps S5250 to S5270.

In step S5250, if the working efficiency is greater than the specified efficiency threshold, the working voltage of the power module is determined to be the first voltage.

In step S5270, if the working efficiency is less than or equal to the specified efficiency threshold, the working voltage of the power module is determined to be the second voltage.

The appointed efficiency threshold is a default value in the control module, and a researcher can also adjust the appointed efficiency threshold according to the working condition of the wireless power supply device. Specifically, the efficiency threshold is specified as a proportional value of less than or equal to 50%, for example, the efficiency threshold is specified as 50%. The specific description of the first voltage and the second voltage may refer to the above embodiments, and will not be repeated here.

In step S530, the control voltage adjustment module adjusts the output voltage of the power module to the operating voltage.

The control module determines a corresponding voltage adjustment strategy according to a specific implementation mode of the voltage adjustment module.

Specifically, in some embodiments, the voltage adjustment module includes a voltage switching module and a plurality of voltage output modules, and step S530 includes steps S5310 to S5330.

Step S5310, determining a target voltage output module of the plurality of voltage output modules based on the operating voltage.

The difference between the output voltage of the target voltage output module and the working voltage is smaller than a preset difference. In the embodiment of the application, the control module determines the target voltage output module based on a hardware parameter table of the pre-stored voltage output module under the condition that the working voltage is determined. Wherein the hardware parameter table characterizes a mapping relation between the type of the voltage output module and the output voltage. The hardware parameter table is shown in table-1.

TABLE-1

Voltage output module	Output voltage
		First voltage output module	310V
Second voltage output module	24V

For example, in the case where the operation voltage is 310V (i.e., the first voltage), the target voltage output module may be determined to be the first voltage output module based on the hardware parameter table.

In step S5330, the control voltage switching module turns on the branch where the target voltage output module is located.

In this embodiment of the present application, the control module sends a control signal to the first selection control end of the voltage switching module, and the voltage switching module conducts the branch where the target voltage output module is located when receiving the control signal, for example, in the embodiment shown in fig. 3, if the target voltage output module is the first voltage output module, the control module controls the voltage switching module to conduct the first voltage selection end, and at this time, the wireless power supply circuit is in a high-power supply mode, and the control module further conducts the branch where the first resonant capacitor is located. If the target voltage output module is the second voltage output module, the control module controls the voltage switching module to conduct the second voltage selection end, at the moment, the wireless power supply circuit is in a low-power supply mode, and the control module conducts the branch where the second resonance capacitor is located.

In other embodiments, the voltage adjustment module includes a voltage adjustment module, and step S530 includes step S5350.

In step S5350, the voltage regulating module is controlled to regulate the output voltage of the power module to the operating voltage.

In this embodiment of the present application, when determining the working voltage, the control module sends a voltage adjustment signal to the control end of the voltage adjustment module, and when receiving the voltage adjustment signal, the voltage adjustment module adjusts the output voltage of the power module to the working voltage. Specifically, taking the voltage regulating module as a BUCK circuit as an example, the BUCK circuit comprises a switching power tube. The control end of the voltage regulating module, namely the control end of the switching power tube, is connected with the control module. Under the condition that the working voltage is determined, the control module generates a corresponding control pulse signal to control the switching power tube to be switched on or off, and then the output voltage is adjusted.

The embodiment of the application provides a circuit control method which is applied to the wireless power supply circuit, and particularly, the method introduces a specific implementation mode that the wireless power supply circuit automatically adjusts output voltage, so that the adjusted output voltage can be matched with an external load to be charged, and a user does not need to subjectively judge whether the wireless power supply circuit is in a high-power supply mode or a low-power supply mode, thereby avoiding the trouble of use of the user.

In this specification, certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the difference in name as a way of distinguishing between components, but rather take the difference in functionality of the components as a criterion for distinguishing. As used throughout the specification and claims, the word "comprise" and "comprises" are to be construed as "including, but not limited to"; by "substantially" is meant that a person skilled in the art can solve the technical problem within a certain error range, essentially achieving the technical effect.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description of the present application, but do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

In this application, the terms "mounted," "connected," "secured," and the like are to be construed broadly, unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect via an intermediate medium, or communication between two elements, or only surface contact. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (12)

1. A wireless power supply circuit, comprising:

a power module;

the voltage adjusting module is connected with the power supply module and used for adjusting the output voltage of the power supply module;

the switch module is connected with the voltage adjusting module;

the resonance module comprises a resonance capacitor module and a resonance inductor module, and the resonance capacitor module and the resonance inductor module are connected in series and then connected to the switch module; the resonant capacitor module comprises a plurality of resonant capacitors, at least one resonant capacitor is in a conducting state when the resonant module is in a working state, and working parameters of the wireless power supply circuit are different under the condition that different resonant capacitors are in the conducting state; and

And the control module is connected with the voltage adjustment module and is configured to control the voltage adjustment module to adjust the output voltage of the power supply module based on the working parameters of the wireless power supply circuit.

2. The wireless power supply circuit of claim 1 wherein said voltage adjustment module comprises a voltage switching module and a plurality of voltage output modules;

the voltage output modules are connected in parallel with the output end of the power supply module;

the voltage switching module comprises a voltage connecting end and a plurality of voltage selecting ends, wherein the voltage selecting ends are connected with the voltage output ends of the voltage output modules in a one-to-one correspondence mode, and the voltage connecting ends are connected with the switch modules.

3. The wireless power supply circuit of claim 1 wherein said voltage regulation module comprises a voltage regulation module connected between said power module and said switch module;

the voltage regulating module comprises a control end and is connected to the control module through the control end, and the control module is configured to: and controlling the voltage regulating module to regulate the output voltage of the power supply module based on the working parameters of the wireless power supply circuit.

4. A wireless power supply circuit according to any one of claims 1 to 3, wherein the switching module comprises a first switch, a second switch, a third switch and a fourth switch, the first switch and the second switch being connected in series with each other and then connected at the voltage output of the voltage regulation module, the third switch and the fourth switch being connected in series with each other and then connected at the voltage output of the voltage regulation module;

the resonance module further comprises a branch selection module, the branch selection module comprises a connection end and a plurality of selection ends, the selection ends are connected to the resonance capacitors in a one-to-one correspondence manner, and the connection end is connected to a common connection end of the first switch and the second switch; the branch selection module is used for controlling at least one resonant capacitor to be in a conducting state when the resonant module is in a working state;

one end, far away from the branch selection module, of the resonant capacitors is connected to one end of the resonant inductance module, and the other end of the resonant inductance module is connected to a common connection end of the third switch and the fourth switch.

5. The wireless power supply circuit of claim 4 wherein said resonant inductor module comprises a resonant inductor, a common connection formed by a plurality of said resonant capacitors at an end remote from said branch selection module being connected to one end of said resonant inductor, and the other end of said resonant inductor being connected to a common connection of said third switch and said fourth switch.

6. The wireless power supply circuit of claim 4, wherein said resonant inductor module comprises a plurality of resonant inductors, said resonant inductors are connected to said resonant capacitors in a one-to-one correspondence at a side of said resonant capacitors remote from said branch selection module, and a common connection terminal is formed at a side of said resonant capacitors remote from said resonant capacitors and connected to a common connection terminal of said third switch and said fourth switch.

7. A wireless power supply apparatus, comprising:

a housing; and

the wireless power supply circuit of any one of claims 1-6 disposed within the housing.

8. A circuit control method, characterized by being applied to the wireless power supply circuit according to any one of claims 1 to 6, comprising:

acquiring working parameters of the wireless power supply circuit, wherein the working parameters comprise at least one of resonant current and working efficiency;

determining an operating voltage of the power module based on the operating parameter;

and controlling the voltage adjusting module to adjust the output voltage of the power supply module to the working voltage.

9. The circuit control method of claim 8, wherein the operating parameter comprises a resonant current, and wherein the determining the operating voltage of the power module based on the operating parameter comprises:

If the resonant current is greater than a specified current threshold, determining that the working voltage of the power supply module is a first voltage;

and if the resonant current is smaller than or equal to the specified current threshold, determining the working voltage of the power supply module as a second voltage, wherein the second voltage is smaller than the first voltage.

10. The circuit control method according to claim 8, wherein the operation parameter includes an operation efficiency, and the determining the operation voltage of the power supply module based on the operation parameter includes:

if the working efficiency is greater than a specified efficiency threshold, determining that the working voltage of the power supply module is a first voltage;

and if the working efficiency is smaller than or equal to the specified efficiency threshold, determining the working voltage of the power supply module to be a second voltage, wherein the second voltage is smaller than the first voltage.

11. The circuit control method according to any one of claims 8 to 10, characterized in that the voltage adjustment module includes a voltage switching module and a plurality of voltage output modules, the controlling the voltage adjustment module to adjust the output voltage of the power supply module to the operating voltage includes:

Determining a target voltage output module in a plurality of voltage output modules based on the working voltage, wherein the difference between the output voltage of the target voltage output module and the working voltage is smaller than a preset difference;

and controlling the voltage switching module to conduct the branch where the target voltage output module is located.

12. The circuit control method according to any one of claims 8 to 10, characterized in that the voltage adjustment module includes a voltage adjustment module that controls the voltage adjustment module to adjust an output voltage of the power supply module to the operating voltage, including:

and controlling the voltage regulating module to regulate the output voltage of the power supply module to the working voltage.