CN114243940A - Wireless charging circuit, control method thereof and electronic equipment - Google Patents
Wireless charging circuit, control method thereof and electronic equipment Download PDFInfo
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- CN114243940A CN114243940A CN202111526344.2A CN202111526344A CN114243940A CN 114243940 A CN114243940 A CN 114243940A CN 202111526344 A CN202111526344 A CN 202111526344A CN 114243940 A CN114243940 A CN 114243940A
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- 239000003990 capacitor Substances 0.000 claims description 82
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- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 11
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- 238000005516 engineering process Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The application provides a wireless charging circuit, a control method thereof and electronic equipment, and relates to the field of wireless charging. In the wireless charging circuit, a primary side module is connected with a primary side inductor, the primary side inductor is coupled with a secondary side inductor, the secondary side inductor, a switching compensation module and a secondary side module are sequentially connected, the primary side module is externally connected with an input voltage, and the secondary side module and the switching compensation module are both connected with a load; the switching compensation module is used for switching a compensation mode according to the voltage of the load; when the voltage of the load is lower than a set threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output; when the voltage of the load is larger than or equal to the threshold value, the switching compensation module is switched to a second compensation mode, and constant voltage output is achieved. In this application, switch compensation module can switch to different compensation modes according to the voltage condition of load, can realize the wireless charging of constant current constant voltage to improve power transmission's output and transmission efficiency.
Description
Technical Field
The invention relates to the field of wireless charging, in particular to a wireless charging circuit, a control method thereof and electronic equipment.
Background
At present, the shortage of global renewable resources and serious environmental pollution are caused, and the development of new energy automobiles without pollution and zero emission becomes a strategic policy of sustainable development of all countries. At present charging technology is basically for filling electric pile and charging, and is comparatively inconvenient, both has mechanical loss problem, has the safety problem again, influences electric automobile's popularization and popularization, and electric automobile wireless charging can not receive electric energy capacity's restriction, reduces the reliance to the battery, promotes the continuation of the journey mileage, and consequently research development electric automobile wireless charging technology is imperative.
At present, a loosely-coupled transformer in a wireless charging circuit has the defects of large leakage inductance and small excitation inductance, so that the reactive power transmitted by the circuit is increased, and the transmission efficiency is reduced.
Disclosure of Invention
The invention aims to provide a wireless charging circuit, a control method thereof and electronic equipment, which can effectively improve the output power and the transmission efficiency of electric energy transmission in the wireless charging circuit.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present application provides a wireless charging circuit, where the wireless charging circuit includes a primary side module, a loosely coupled transformer module, a switching compensation module, and a secondary side module, where the loosely coupled transformer module includes a primary side inductor and a secondary side inductor;
the primary side module is connected with the primary side inductor, the primary side inductor is coupled with the secondary side inductor, the switching compensation module and the secondary side module are sequentially connected, the primary side module is externally connected with an input voltage, and the secondary side module is connected with a load;
the switching compensation module is used for switching a compensation mode according to the voltage of the load;
when the voltage of the load is lower than a set threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output;
and when the voltage of the load is greater than or equal to the threshold value, the switching compensation module is switched to a second compensation mode to realize constant voltage output.
Optionally, the switching compensation module includes a first capacitor, a second capacitor, a first switch component, and a second switch component;
when the switching compensation module is in a first compensation mode, the first switch component and the second switch component are both in a first conduction state, so that the first capacitor is connected with the secondary side inductor in parallel, the second capacitor is disconnected, and constant current output is realized;
when the switching compensation module is in a second compensation mode, the first switch component and the second switch component are both in a second conduction state, so that the second capacitor is connected in parallel with the secondary inductor, and the first capacitor is connected in series between the second capacitor and the secondary inductor to realize constant voltage output.
Optionally, the switching compensation module further includes a controller, one end of the controller is connected to the load, and the other end of the controller is connected to the first switch component and the second switch component, where the first switch component and the second switch component are both single-pole double-throw switches;
one end of the first capacitor is connected with the first end of the secondary inductor, and the other end of the first capacitor is connected with the third end of the first switch component;
one end of the second capacitor is connected between the second end of the first switch component and the second end of the second switch component, and the other end of the second capacitor is connected with the first end of the first switch component, the second end of the secondary inductor and the secondary module;
the third end of the second switch component is connected with the secondary side module;
the controller is used for controlling the conduction and the closing states of the first switch component and the second switch component according to the voltage of the load;
when the voltage of the load is lower than a set threshold value, the controller controls the first end and the third end of the first switch assembly to be conducted, the first end and the third end of the second switch assembly to be conducted, so that the first capacitor and the secondary side inductor are connected in parallel, the second capacitor is disconnected, and constant current output is achieved;
when the voltage of the load is larger than or equal to the threshold value, the controller controls the second end and the third end of the first switch component to be conducted, the second end and the third end of the second switch component to be conducted, so that the second capacitor and the secondary inductor are connected in parallel, and the first capacitor is connected in series between the second capacitor and the secondary inductor to realize constant voltage output.
Optionally, the switching compensation module further includes a controller, the first switch component and the second switch component are both anti-parallel controllable switch tubes, one end of the controller is connected with a load, and the other end of the controller is connected with the first switch component and the second switch component.
Optionally, the primary side module includes an inverter unit and a third capacitor;
the output end of the inversion unit is respectively connected with one end of the third capacitor and the second end of the primary side inductor;
the other end of the third capacitor is connected with the first end of the primary side inductor;
the input end of the inversion unit is externally connected with direct current.
In a second aspect, the present application provides a method for controlling a wireless charging circuit, where the method is applied to the wireless charging circuit, and includes:
setting a threshold value;
acquiring the voltage of the load;
obtaining a comparison result according to the threshold and the voltage of the load;
when the voltage of the load is lower than the threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output;
and when the voltage of the load is higher than or equal to the threshold value, the switching compensation module is switched to a second compensation mode to realize constant voltage output.
Optionally, when the voltage of the load is lower than the threshold, the switching compensation module switches to a first compensation mode to realize constant current output; when the voltage of the load is higher than or equal to the threshold value, the switching compensation module is switched to a second compensation mode, and the step of realizing constant voltage output comprises the following steps:
when the switching compensation module is in a first compensation mode, the first switch assembly and the second switch assembly are controlled to be in a first conduction state, so that the first capacitor is connected with the secondary side inductor in parallel, the second capacitor is disconnected, and constant current output is realized;
when the switching compensation module is in a second compensation mode, the first switch assembly and the second switch assembly are controlled to be in a second conduction state, so that the second capacitor is connected with the secondary inductor in parallel, and the first capacitor is connected between the second capacitor and the secondary inductor in series to realize constant voltage output.
Optionally, the first switch assembly and the second switch assembly are both single-pole double-throw switches.
Optionally, the first switch component and the second switch component are both anti-parallel controllable switch tubes.
In a third aspect, the present application provides an electronic device including the wireless charging circuit.
Compared with the prior art, the invention has the following beneficial effects:
the application provides a wireless charging circuit, a control method thereof and electronic equipment, wherein the wireless charging circuit comprises a primary side module, a loose coupling transformer module, a switching compensation module and a secondary side module, wherein the loose coupling transformer module comprises a primary side inductor and a secondary side inductor; the primary side module is connected with the primary side inductor, the primary side inductor is coupled with the secondary side inductor, the switching compensation module and the secondary side module are sequentially connected, the primary side module is externally connected with an input voltage, and the secondary side module and the switching compensation module are connected with a load; the switching compensation module is used for switching a compensation mode according to the voltage of the load; when the voltage of the load is lower than a set threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output; when the voltage of the load is larger than or equal to the threshold value, the switching compensation module is switched to a second compensation mode, and constant voltage output is achieved. In this application, switch compensation module can switch to different compensation modes according to the voltage condition of load, can realize the wireless charging of constant current constant voltage to improve power transmission's output and transmission efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a wireless charging circuit according to an embodiment of the present disclosure;
fig. 2 is a second schematic structural diagram of a wireless charging circuit according to an embodiment of the present disclosure;
fig. 3 is a third schematic structural diagram of a wireless charging circuit according to an embodiment of the present disclosure;
fig. 4 is a fourth schematic structural diagram of a wireless charging circuit according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a control method of a wireless charging circuit according to an embodiment of the present disclosure.
Icon: 100-a wireless charging circuit; 10-a primary side module; 20-a handover compensation module; 30-secondary side module; l1-primary side inductance; l2 — secondary inductance; c1 — first capacitance; c2 — second capacitance; 210-a first switch assembly; 220-a second switching assembly; 230-a controller; 110-an inverter unit; 120-a first rectifying unit; 310-a second rectifying unit; 320-a filtering unit; c3-third capacitance.
Detailed Description
As described in the background art, at present, a loosely coupled transformer in a wireless charging circuit has the disadvantages of large leakage inductance and small excitation inductance, so that the reactive power transmitted by the circuit is increased, and the transmission efficiency is reduced.
The problems existing in the prior art are all the results obtained after the inventor practices and researches, so that the discovery process of the problems and the solution proposed by the embodiment of the invention in the following for the problems are all the contributions of the inventor in the invention process.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, the present application provides a wireless charging circuit 100, where the wireless charging circuit 100 includes a primary side module 10, a loosely coupled transformer module, a switching compensation module 20, and a secondary side module 30, and the loosely coupled transformer module includes a primary side inductor L1 and a secondary side inductor L2.
The primary side module 10 is connected with a primary side inductor L1, the primary side inductor L1 is coupled with a secondary side inductor L2, the secondary side inductor L2, the switching compensation module 20 and the secondary side module 30 are sequentially connected, the primary side module 10 is externally connected with an input voltage, and the secondary side module 30 is connected with a load.
The switching compensation module 20 is configured to switch the compensation mode according to the voltage of the load, and when the voltage of the load is lower than a set threshold, the switching compensation module 20 switches to the first compensation mode to implement constant current output; when the voltage of the load is greater than or equal to the threshold, the switching compensation module 20 switches to the second compensation mode to realize constant voltage output.
In this embodiment, the switching compensation module 20 is connected to the secondary inductor L2, and the switching compensation module 20 can switch the compensation mode according to the voltage of the load, so that under the condition of different load voltages, the leakage inductance and the excitation inductance can be compensated, the wireless power transmission of constant voltage and constant current is realized, and the output power and the transmission efficiency of the power transmission in the wireless charging circuit can be effectively improved.
It should be noted that, in this embodiment, the first compensation mode is an S-P compensation mode, in which the circuit realizes a constant current output, and the second compensation mode is an S-SP compensation mode, in which the circuit realizes a constant voltage output. Since the circuit structures and implementation principles of S-P compensation and S-SP compensation are prior art, they are not described in detail in this application.
It should be noted that, in this embodiment, the switching compensation module 20 may implement the collection of the load voltage and the switching of the compensation mode through an internal controller, or may implement the above functions through an external overall controller, which is not limited explicitly herein.
Referring to fig. 2, in another alternative embodiment, the switching compensation module 20 includes a first capacitor C1, a second capacitor C2, a first switch element 210, and a second switch element 220.
It should be noted that in this embodiment, one end of the first capacitor C1 is connected to the first end of the secondary inductor L2 and the first end of the second switch element 220, the other end of the first capacitor C1 is connected to the third end of the first switch element 210, one end of the second capacitor C2 is connected between the second end of the first switch element 210 and the second end of the second switch element 220, the other end of the second capacitor C2 is connected to the first end of the first switch element 210, the second end of the secondary inductor L2 and the primary side module 10, and the third end of the second switch tube is also connected to the secondary side module 30.
When the switching compensation module 20 is in the first compensation mode, the first switch element 210 and the second switch element 220 are both in the first on state, so that the first capacitor C1 is connected in parallel with the secondary inductor L2, and the second capacitor C2 is turned off, i.e., an S-P compensation mode is formed, thereby realizing constant current output.
When the switching compensation module 20 is in the second compensation mode, the first switch element 210 and the second switch element 220 are both in the second conduction state, so that the second capacitor C2 is connected in parallel with the secondary inductor L2, and the first capacitor C1 is connected in series between the second capacitor C2 and the secondary inductor L2, thereby forming an S-SP compensation mode to achieve constant voltage output.
It should be noted that, in this embodiment, the first on state refers to a conductive state capable of making the first capacitor C1 and the second capacitor C2 form an S-P compensation, and the second on state refers to a conductive state capable of making the first capacitor C1 and the second capacitor C2 form an S-SP compensation.
Similarly, in this embodiment, the collection of the load voltage and the control of the conducting states of the first switch component 210 and the second switch component 220 may be realized by switching a controller built in the compensation module 20, or the above functions may be realized by an external general controller, which is not limited herein.
Referring to fig. 3, in another possible implementation, the switching compensation module 20 further includes a controller 230, one end of the controller 230 is connected to the load, and the other end of the controller 230 is connected to the first switch element 210 and the second switch element 220, wherein the first switch element 210 and the second switch element 220 are both single-pole double-throw switches;
one end of the first capacitor C1 is connected to the first end of the secondary inductor L2, and the other end of the first capacitor C1 is connected to the third end of the first switch module 210; one end of the second capacitor C2 is connected between the second end of the first switch element 210 and the second end of the second switch element 220, and the other end of the second capacitor C2 is connected to the first end of the first switch element 210, the second end of the secondary inductor L2, and the secondary module 30; the third terminal of the second switch component 220 is connected with the secondary side module 30; the controller 230 is configured to control the on and off states of the first and second switching elements 210 and 220 according to the voltage of the load;
when the voltage of the load is lower than the set threshold, the controller 230 controls the first terminal and the third terminal of the first switching element 210 to be conducted, and the first terminal and the third terminal of the second switching element 220 to be conducted, so that the first capacitor C1 is connected in parallel with the secondary inductor L2, and the second capacitor C2 is disconnected, thereby realizing constant current output;
when the voltage of the load is greater than or equal to the threshold, the controller 230 controls the second terminal and the third terminal of the first switching element 210 to be conducted, and the second terminal and the third terminal of the second switching element 220 to be conducted, so that the second capacitor C2 is connected in parallel with the secondary inductor L2, and the first capacitor C1 is connected in series between the second capacitor C2 and the secondary inductor L2, thereby realizing constant voltage output.
In this embodiment, the switching compensation module 20 is provided with a controller 230, the controller 230 can collect the voltage of the load, and simultaneously control the conduction states of the first switch component 210 and the second switch component 220 according to the voltage, and the first switch component 210 and the second switch component 220 adopt single-pole double-throw switches, which are simple in structure and reliable in performance.
In another alternative embodiment, the switching compensation module 20 further includes a controller 230, the first switch component 210 and the second switch component 220 are anti-parallel controllable switch tubes, one end of the controller 230 is connected to a load, and the other end of the controller 230 is connected to the first switch component 210 and the second switch component 220.
In this embodiment, the first switch component 210 and the second switch component 220 both employ anti-parallel controllable switch tubes, which can be implemented by IGBT tubes or MOS tubes, and since the anti-parallel controllable switch tubes belong to the prior art, the specific structure thereof is not described herein.
Referring to fig. 4, in another alternative embodiment, the primary side module 10 includes an inverter unit 110 and a third capacitor C3, an output terminal of the inverter unit 110 is connected to one end of the third capacitor C3 and a second end of the primary side inductor L1, the other end of the third capacitor C3 is connected to a first end of the primary side inductor L1, and an input terminal of the inverter unit 110 is externally connected to a direct current.
Optionally, the inverter unit 110 is a full-bridge inverter circuit.
In another alternative embodiment, the primary module 10 further includes a first rectifying unit 120, an output end of the first rectifying unit 120 is connected to the inverting unit 110, and an input end of the first rectifying unit 120 is externally connected to the alternating current.
Optionally, the secondary side module 30 includes a second rectifying unit 310, an input end of the second rectifying unit 310 is connected to the switching compensation module 20, and an output end of the second rectifying unit 310 is connected to the load.
Optionally, the secondary side module 30 further includes a filtering unit 320, an input end of the filtering unit 320 is connected to an output end of the second rectifying unit 310, and an output end of the filtering unit 320 is connected to a load.
Referring to fig. 5, an embodiment of the present invention further provides a control method of a wireless charging circuit, applied to the wireless charging circuit 100, the method including:
step 201: a threshold value is set.
Step 202: the voltage of the load is obtained.
Step 203: and obtaining a comparison result according to the threshold value and the voltage of the load.
Step 204: when the voltage of the load is lower than the threshold, the switching compensation module 20 switches to the first compensation mode to realize constant current output.
Step 205: when the voltage of the load is higher than or equal to the threshold, the switching compensation module 20 switches to the second compensation mode to realize constant voltage output.
In another alternative embodiment, the step 204 includes:
when the switching compensation module 20 is in the first compensation mode, the first switching element 210 and the second switching element 220 are both controlled to be in the first conduction state, so that the first capacitor C1 is connected in parallel with the secondary inductor L2, and the second capacitor C2 is disconnected, thereby implementing constant current output.
The step 205 includes:
when the switching compensation module 20 is in the second compensation mode, the first switching element 210 and the second switching element 220 are both controlled to be in the second conduction state, so that the second capacitor C2 is connected in parallel with the secondary inductor L2, and the first capacitor C1 is connected in series between the second capacitor C2 and the secondary inductor L2, thereby realizing constant voltage output.
Optionally, the first switch assembly 210 and the second switch assembly 220 are both single pole double throw switches.
Optionally, the first switching component 210 and the second switching component 220 are both anti-parallel controllable switching tubes.
The embodiment of the present application further provides an electronic device, which includes the wireless charging circuit 100.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A wireless charging circuit is characterized by comprising a primary side module, a loose coupling transformer module, a switching compensation module and a secondary side module, wherein the loose coupling transformer module comprises a primary side inductor and a secondary side inductor;
the primary side module is connected with the primary side inductor, the primary side inductor is coupled with the secondary side inductor, the switching compensation module and the secondary side module are sequentially connected, the primary side module is externally connected with an input voltage, and the secondary side module is connected with a load;
the switching compensation module is used for switching a compensation mode according to the voltage of the load;
when the voltage of the load is lower than a set threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output;
and when the voltage of the load is greater than or equal to the threshold value, the switching compensation module is switched to a second compensation mode to realize constant voltage output.
2. The wireless charging circuit of claim 1, wherein the switching compensation module comprises a first capacitor, a second capacitor, a first switch component, and a second switch component;
when the switching compensation module is in a first compensation mode, the first switch component and the second switch component are both in a first conduction state, so that the first capacitor is connected with the secondary side inductor in parallel, the second capacitor is disconnected, and constant current output is realized;
when the switching compensation module is in a second compensation mode, the first switch component and the second switch component are both in a second conduction state, so that the second capacitor is connected in parallel with the secondary inductor, and the first capacitor is connected in series between the second capacitor and the secondary inductor to realize constant voltage output.
3. The wireless charging circuit of claim 2, wherein the switching compensation module further comprises a controller, one end of the controller is connected to the load, and the other end of the controller is connected to the first switch assembly and the second switch assembly, wherein the first switch assembly and the second switch assembly are both single-pole double-throw switches;
one end of the first capacitor is connected with the first end of the secondary inductor, and the other end of the first capacitor is connected with the third end of the first switch component;
one end of the second capacitor is connected between the second end of the first switch component and the second end of the second switch component, and the other end of the second capacitor is connected with the first end of the first switch component, the second end of the secondary inductor and the secondary module;
the third end of the second switch component is connected with the secondary side module;
the controller is used for controlling the conduction and the closing states of the first switch component and the second switch component according to the voltage of the load;
when the voltage of the load is lower than a set threshold value, the controller controls the first end and the third end of the first switch assembly to be conducted, the first end and the third end of the second switch assembly to be conducted, so that the first capacitor and the secondary side inductor are connected in parallel, the second capacitor is disconnected, and constant current output is achieved;
when the voltage of the load is larger than or equal to the threshold value, the controller controls the second end and the third end of the first switch component to be conducted, the second end and the third end of the second switch component to be conducted, so that the second capacitor and the secondary inductor are connected in parallel, and the first capacitor is connected in series between the second capacitor and the secondary inductor to realize constant voltage output.
4. The wireless charging circuit of claim 2, wherein the switching compensation module further comprises a controller, the first switch component and the second switch component are anti-parallel controllable switch tubes, one end of the controller is connected to a load, and the other end of the controller is connected to the first switch component and the second switch component.
5. The wireless charging circuit of claim 1, wherein the primary side module comprises an inverter unit and a third capacitor;
the output end of the inversion unit is respectively connected with one end of the third capacitor and the second end of the primary side inductor;
the other end of the third capacitor is connected with the first end of the primary side inductor;
the input end of the inversion unit is externally connected with direct current.
6. A control method for a wireless charging circuit, the method being applied to the wireless charging circuit of any one of claims 1 to 5, the method comprising:
setting a threshold value;
acquiring the voltage of the load;
obtaining a comparison result according to the threshold and the voltage of the load;
when the voltage of the load is lower than the threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output;
and when the voltage of the load is higher than or equal to the threshold value, the switching compensation module is switched to a second compensation mode to realize constant voltage output.
7. The control method of the wireless charging circuit according to claim 6, wherein the switching compensation module comprises a first capacitor, a second capacitor, a first switch component and a second switch component;
when the voltage of the load is lower than the threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output; when the voltage of the load is higher than or equal to the threshold value, the switching compensation module is switched to a second compensation mode, and the step of realizing constant voltage output comprises the following steps:
when the switching compensation module is in a first compensation mode, the first switch assembly and the second switch assembly are controlled to be in a first conduction state, so that the first capacitor is connected with the secondary side inductor in parallel, the second capacitor is disconnected, and constant current output is realized;
when the switching compensation module is in a second compensation mode, the first switch assembly and the second switch assembly are controlled to be in a second conduction state, so that the second capacitor is connected with the secondary inductor in parallel, and the first capacitor is connected between the second capacitor and the secondary inductor in series to realize constant voltage output.
8. The method of claim 7, wherein the first switch assembly and the second switch assembly are single-pole double-throw switches.
9. The method for controlling the wireless charging circuit according to claim 7, wherein the first switch component and the second switch component are both anti-parallel controllable switch tubes.
10. An electronic device comprising the wireless charging circuit of any one of claims 1-5.
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| CN202111526344.2A CN114243940A (en) | 2021-12-14 | 2021-12-14 | Wireless charging circuit, control method thereof and electronic equipment |
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| CN202111526344.2A CN114243940A (en) | 2021-12-14 | 2021-12-14 | Wireless charging circuit, control method thereof and electronic equipment |
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| CN105429313A (en) * | 2015-12-11 | 2016-03-23 | 中国矿业大学 | Wireless electric energy transmission system with switchable resonance compensation topology and control method thereof |
| CN109301904A (en) * | 2018-11-02 | 2019-02-01 | 东南大学 | A kind of battery wireless charging system of high-order combined type compensation network |
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