CN114123537B - Wireless charging transmitter, wireless charging receiver and wireless charging system - Google Patents
Wireless charging transmitter, wireless charging receiver and wireless charging system Download PDFInfo
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- CN114123537B CN114123537B CN202110038596.4A CN202110038596A CN114123537B CN 114123537 B CN114123537 B CN 114123537B CN 202110038596 A CN202110038596 A CN 202110038596A CN 114123537 B CN114123537 B CN 114123537B
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Classifications
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- 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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- 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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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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
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0044—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction specially adapted for holding portable devices containing batteries
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the application provides a wireless charging transmitter, a wireless charging receiver and a wireless charging system, relates to the technical field of charging, and aims to solve the problem of low wireless charging speed. The wireless charging transmitter comprises a first voltage conversion circuit, a first inverter circuit, a first transmitting coil, a second inverter circuit and a second transmitting coil. The first charging branch circuit where the first transmitting coil is located in the wireless charging system has a first voltage transmission gain k1, and the second charging branch circuit where the second transmitting coil is located has a second voltage transmission gain k2, where k1 is different from k 2. Under the condition that only one voltage conversion circuit is arranged in the wireless charging transmitter, the first output voltage V o1 of the first charging branch circuit is the same as the second output voltage V o2 of the second charging branch circuit, and the output currents provided by the battery by the first charging branch circuit where the first transmitting coil is located and the output currents provided by the second charging branch circuit where the second transmitting coil is located can be accurately controlled.
Description
The present application claims priority from the national intellectual property agency, application number 202010873200.3, chinese patent application entitled "a dual coil wireless charging system," filed on 26, 08, 2020, the entire contents of which are incorporated herein by reference.
Technical Field
The present application relates to the field of charging technologies, and in particular, to a wireless charging transmitter, a wireless charging receiver, and a wireless charging system.
Background
Wireless charging technology (WIRELESS CHARGING technology, WCT) may utilize magnetic fields as conductive media to enable wireless transmission of electrical energy. The wireless charging equipment can have the advantages of no constraint of a charging cable, no setting of a plug interface and the like, so that the use environment of a user is more concise and comfortable, and the mobile terminal is beneficial to realizing the totally-enclosed waterproof design. However, wireless charging is currently slower than wired charging.
Disclosure of Invention
The application provides a wireless charging transmitter, a wireless charging receiver and a wireless charging system, which are used for solving the problem of low wireless charging speed.
In order to achieve the above purpose, the application adopts the following technical scheme:
In one aspect of the application, a wireless charging transmitter is provided. The wireless charging transmitter is used for outputting an alternating magnetic field to the wireless charging receiver. The wireless charging transmitter comprises a first voltage conversion circuit, a first inverter circuit, a first transmitting coil, a second inverter circuit and a second transmitting coil. The first voltage conversion circuit is electrically connected with the adapter and is used for converting direct current output by the adapter into direct current. The first inverter circuit is electrically connected with the first voltage conversion circuit and is used for converting direct current output by the first voltage conversion circuit into a first square wave signal. The first transmitting coil is electrically connected with the first inverter circuit and is used for converting the first square wave signal into a first alternating magnetic field. The ratio of the first output voltage V o1 output to the battery in the wireless charging receiver to the input voltage V in1 of the first inverter circuit is the first voltage transmission gain k1. In addition, the second inverter circuit is electrically connected with the adapter and is used for converting direct current output by the adapter into a second square wave signal. The second transmitting coil is electrically connected with the second inverter circuit and is used for converting the second square wave signal into a second alternating magnetic field. The ratio of the second output voltage V o2 output to the battery to the input voltage V in2 of the second inverter circuit is the second voltage transmission gain k2. The first voltage transmission gain k1 is different from the second voltage transmission gain k2, and the first output voltage V o1 and the second output voltage V o2 are the same.
In this way, in the wireless charging transmitter, the first voltage conversion circuit, the first inverter circuit, and the first transmitting coil may form a transmitting end of the first charging branch of the wireless charging system. In addition, the second inverter circuit and the second transmitting coil may constitute a transmitting end of a second charging branch of the wireless charging system. When the two charging branches charge the battery at the same time, compared with a wireless charging system with only one charging branch, the scheme of the application provides more electric quantity for the battery in the same time, thereby effectively improving the charging efficiency of the battery and enabling the charging speed of wireless charging to be equivalent to that of wired charging. On the other hand, the wireless charging transmitter is only provided with the first voltage conversion circuit in the first charging branch circuit, and the second inverter circuit in the second charging branch circuit can be directly and electrically connected with the adapter, so that the structure of the wireless charging transmitter can be effectively simplified. On the other hand, when the battery is about to be fully charged or the coil in the first charging branch or the second charging branch generates heat, the output currents of the two charging branches need to be precisely controlled so as to reduce the current output by the first charging branch or the second charging branch to the battery. Because the first charging branch circuit and the second charging branch circuit are connected in parallel and then supply power to the battery, in order to avoid that the output ends of the first charging branch circuit and the second charging branch circuit which are connected in parallel cannot generate impact current, the current output by the first charging branch circuit or the second charging branch circuit changes along with the charging branch circuit with higher output voltage, and the first output voltage V o1 provided by the first charging branch circuit to the battery and the second output voltage V o2 provided by the second charging branch circuit to the battery need to be the same. In this case, in the process of adjusting the current output by the charging branch, since there is a difference between the voltage output by the first transmitting coil and the voltage output by the second transmitting coil, the values of the first voltage transmission gain k1 and the second voltage transmission gain k2 may be set to be different, so that the first output voltage V o1 and the second output voltage V o2 are the same under the respective actions of the transmission gains. And the output currents respectively provided by the first charging branch and the second charging branch to the battery can be accurately controlled.
Optionally, the first voltage conversion circuit is a boost circuit, and the first voltage transmission gain k1 is smaller than the second voltage transmission gain k2. In this way, since the first voltage transmission gain k1 is smaller than the second voltage transmission gain k2, the transformer formed by the first transmitting coil and the first receiving coil in the first charging branch can have a step-down function, and the voltage output from the first voltage conversion circuit as the step-up circuit can be step-down so that the first output voltage V o1 and the second output voltage V o2 are the same.
Optionally, in the wireless charging receiver, the number of turns of the first receiving coil for receiving the first alternating magnetic field is smaller than the number of turns of the first transmitting coil. At this time, the inductance of the first receiving coil is smaller than the inductance of the first transmitting coil, and the first voltage transmission gain k1 may be smaller than 1. In the wireless charging receiver, the number of turns of the second receiving coil for receiving the second alternating magnetic field is greater than or equal to the number of turns of the second transmitting coil. At this time, the inductance of the second receiving coil may be greater than or equal to the inductance of the second transmitting coil, so that the second voltage transmission gain k2 may be greater than or equal to 1.
Optionally, the first voltage conversion circuit is a step-down circuit, and the first voltage transmission gain k1 is greater than the second voltage transmission gain k2. In this way, since the first voltage transmission gain k1 is larger than the second voltage transmission gain k2, the transformer formed by the first transmitting coil and the first receiving coil in the first charging branch may have a boosting function, and the voltage output from the first voltage conversion circuit as the step-down circuit may be boosted so that the first output voltage V o1 and the second output voltage V o2 are the same.
Optionally, in the wireless charging receiver, the number of turns of the first receiving coil for receiving the first alternating magnetic field is larger than the number of turns of the first transmitting coil. At this time, the inductance of the first receiving coil is greater than the inductance of the first transmitting coil, and the first voltage transmission gain k1 may be greater than 1. In the wireless charging receiver, the number of turns of the second receiving coil for receiving the second alternating magnetic field is smaller than or equal to the number of turns of the second transmitting coil. At this time, the inductance of the second receiving coil may be less than or equal to the inductance of the second transmitting coil, so that the second voltage transmission gain k2 may be less than or equal to 1.
Optionally, the wireless charging transmitter further comprises a first matching capacitor and a second matching capacitor. The first matching capacitor is connected in series with the first transmitting coil and forms a first series resonance network with the first transmitting coil. In the process of charging and discharging the first matching capacitor and the first transmitting coil by the first inverter circuit, the first transmitting coil can be enabled to convert the first square wave signal into the first alternating magnetic field. The second matching capacitor is connected in series with the second transmitting coil and forms a second series resonance network with the second transmitting coil. In the process of charging and discharging the second matching capacitor and the second transmitting coil by the second inverter circuit, the second transmitting coil can be enabled to convert the second square wave signal into a second alternating magnetic field. Wherein the operating frequency of the first series resonant network is different from the operating frequency of the second series resonant network.
Optionally, the wireless charging transmitter further comprises a first magnetic bar. When the working frequency of the first series resonance network is smaller than that of the second series resonance network, the first transmitting coil is a round coil, and the second transmitting coil is a magnetic rod coil wound on the first magnetic rod. When the working frequency of the first series resonance network is greater than that of the second series resonance network, the first transmitting coil is a magnetic rod coil wound on the first magnetic rod, and the second transmitting coil is a circular coil. The size of the magnetic rod coil is smaller than that of the round coil, the magnetic rod coil can work at a higher working frequency, the magnetic rod coil has higher energy density, the provided charging power is larger, and the wireless charging speed is improved.
Optionally, the wireless charging transmitter further comprises a first transmit controller, a second transmit controller, and a first wireless transceiver. The first emission controller is electrically connected with the first voltage conversion circuit and the first inverter circuit, and is used for inputting a first Pulse Width Modulation (PWM) signal to the first voltage conversion circuit so as to control the output voltage of the first voltage conversion circuit, and is used for inputting a second PWM signal to the first inverter circuit so as to control the frequency of the first square wave signal. The second emission controller is electrically connected with the second inverter circuit and is used for inputting a third PWM signal to the second inverter circuit so as to control the frequency of the second square wave signal.
Alternatively, 0 < |k1-k2| is less than or equal to 0.3. When |k1-k2| > 0.3, the difference between the first voltage transmission gain k1 and the second voltage transmission gain k2 is larger, and the voltage at the input end and the voltage at the output end of the first voltage conversion circuit are both larger, so that the conversion efficiency of the first voltage conversion circuit is reduced.
In another aspect of the application, a wireless charging receiver is provided. The wireless charging receiver comprises a battery, a first receiving coil, a first receiving controller, a second receiving coil and a second receiving controller. The first receiving coil is used for receiving a first alternating magnetic field output by a first transmitting coil in the wireless charging transmitter and converting the first alternating magnetic field into alternating current. The first receiving controller is electrically connected with the first receiving coil and the battery, and is used for converting alternating current generated by the first receiving coil into direct current and outputting the direct current to the battery. The ratio of the first output voltage V o1 output by the first receiving controller to the battery and the input voltage V in1 of the first inverter circuit electrically connected to the first transmitting coil in the wireless charging transmitter is the first voltage transmission gain k1. The second receiving coil is used for receiving a second alternating magnetic field output by the second transmitting coil in the wireless charging transmitter and converting the second alternating magnetic field into alternating current. And the second receiving controller is electrically connected with the second receiving coil and the battery, and is used for converting alternating current generated by the second receiving coil into direct current and outputting the direct current to the battery. The ratio of the second output voltage V o2 output by the second receiving controller to the battery and the input voltage V in2 of the second inverter circuit electrically connected to the second transmitting coil in the wireless charging transmitter is the second voltage transmission gain k2. The first voltage transmission gain k1 is different from the second voltage transmission gain k2, and the first output voltage V o1 and the second output voltage V o2 are the same.
In this way, in the wireless charging receiver, the first receiving coil and the first receiving controller may form a receiving end of the first charging branch of the wireless charging system. In addition, the second receiving coil and the second receiving controller may form a receiving end of a second charging branch of the wireless charging system. When the two charging branches charge the battery at the same time, compared with a wireless charging system with only one charging branch, the scheme of the application provides more electric quantity for the battery in the same time, thereby effectively improving the charging efficiency of the battery and enabling the charging speed of wireless charging to be equivalent to that of wired charging. On the other hand, when the battery is about to be fully charged or the coil in the first charging branch or the second charging branch generates heat, the output currents of the two charging branches need to be precisely controlled so as to reduce the current output by the first charging branch or the second charging branch to the battery. Because the first charging branch circuit and the second charging branch circuit are connected in parallel and then supply power to the battery, in order to avoid that the output ends of the first charging branch circuit and the second charging branch circuit which are connected in parallel cannot generate impact current, the current output by the first charging branch circuit or the second charging branch circuit changes along with the charging branch circuit with higher output voltage, and the first output voltage V o1 provided by the first charging branch circuit to the battery and the second output voltage V o2 provided by the second charging branch circuit to the battery need to be the same. In this case, in the process of adjusting the current output by the charging branch, since there is a difference between the voltage output by the first transmitting coil and the voltage output by the second transmitting coil, the values of the first voltage transmission gain k1 and the second voltage transmission gain k2 may be set to be different, so that under the respective actions of the transmission gains, the first output voltage V o1 and the second output voltage V o2 are the same, and further, the output currents provided by the first charging branch and the second charging branch to the battery by the respective methods may be accurately controlled.
Optionally, the first voltage transmission gain k1 is smaller than the second voltage transmission gain k2. The number of turns of the first receiving coil is smaller than the number of turns of the first transmitting coil. The number of turns of the second receiving coil is greater than or equal to the number of turns of the second transmitting coil. The technical effects of the number of turns of the first receiving coil and the number of turns of the second receiving coil are the same as those described above, and are not repeated here.
Optionally, the first voltage transmission gain k1 is greater than the second voltage transmission gain k2. The number of turns of the first receiving coil is greater than the number of turns of the first transmitting coil. The number of turns of the second receiving coil is less than or equal to the number of turns of the second transmitting coil. The technical effects of the number of turns of the first receiving coil and the number of turns of the second receiving coil are the same as those described above, and are not repeated here.
Optionally, the wireless charging receiver further comprises a second magnetic bar. The first receiving coil is a round coil, and the second receiving coil is a magnetic rod coil wound on the second magnetic rod. Or the first receiving coil is a magnetic rod coil wound on the second magnetic rod, and the second receiving coil is a circular coil. The technical effects of the magnetic rod coil are the same as those described above, and are not repeated here.
Optionally, the wireless charging receiver further includes a first thermistor, a second thermistor, and a charging manager. The first thermistor is used for sensing a first temperature T 1 of the first receiving coil. The second thermistor is used for sensing a second temperature T 2 of the second receiving coil. In the case where the wireless charging receiver further includes a charging manager, the charging manager may be electrically connected to the first thermistor and the second thermistor. The charge manager may be configured to generate a power request based on the first temperature T 1 and the second temperature T 2. The power request is used to regulate the charging power output by the wireless charging transmitter. Specifically, the charging manager may calculate the first current error and the second current error according to a preset charging strategy. The preset charging strategy includes a first mapping relationship between the first temperature T 1 and the first target current I G1, and a second mapping relationship between the second temperature T 2 and the second target current I G2. The first receiving controller is used for calculating a first current error and a second current error according to a preset charging strategy, and comprises the following steps: the first receiving controller is specifically configured to obtain a first target current I G1 according to a first temperature T 1 and a first mapping relationship, and calculate an absolute value of a difference between a first output current I 1 and a first target current I G1, so as to obtain a first current error; the first receiving controller is further specifically configured to obtain a second target current I G2 according to the second temperature T 2 and the second mapping relationship, and calculate an absolute value of a difference between the second output current I 2 and the second target current I G2, to obtain a second current error. In this way, when the temperature of the receiving end coil in any one of the first charging branch and the second charging branch is higher, the wireless charging system can obtain a target current matched with a temperature target value according to the preset charging strategy and the temperature target value of the expected cooling and generate a power request, and then the wireless charging transmitter can adjust the output voltage of the adapter and the first voltage conversion circuit according to the power request by sending the power request to the wireless charging transmitter, so that the purpose of adjusting the charging power output by the wireless charging transmitter is achieved. In addition, the switching frequencies of the MOS transistors in the first inverter circuit and the second inverter circuit can be regulated in a combined mode, so that the first output current I 1 output by the first charging branch circuit is the same as or is close to the first target current I G1, and the second output current I 2 output by the second charging branch circuit is the same as or is close to the second target current I G2. Therefore, the temperature of one path of charging branch with smaller output current can be reduced to the target temperature by reasonably distributing the first output current I 1 and the second output current I 2, and finally the purpose of reducing the temperature of the receiving end coil is achieved.
Optionally, the wireless charging receiver further includes a second voltage conversion circuit, a first isolation switch, and a second isolation switch. The second voltage conversion circuit is electrically connected with the battery, the first receiving controller and the second receiving controller and is used for converting the voltage output by at least one of the first receiving controller and the second receiving controller into the charging voltage of the battery. When the direct current voltage output by the first receiving controller is too large to be directly supplied to the battery, the second voltage conversion circuit can reduce the voltage output by the first receiving controller to the charging voltage of the battery. In addition, the first isolating switch is electrically connected with the first receiving controller and the second voltage converting circuit. The first receiving controller is used for controlling the opening and the closing of the first isolating switch. The second isolating switch is electrically connected with the second receiving controller and the second voltage conversion circuit. The second receiving controller is used for controlling the opening and the closing of the second isolating switch. The first charging branch and the second charging branch can work independently by controlling the opening and the closing of the first isolating switch and the second isolating switch.
Alternatively, 0 < |k1-k2| is less than or equal to 0.3. The technical effects of this range are the same as those described above, and are not repeated here.
In another aspect of the application, a wireless charging system is provided. The wireless charging system comprises an adapter, any one of the wireless charging transmitters described above and any one of the wireless charging receivers described above. The adapter is electrically connected with a first voltage conversion circuit and a second inverter circuit in the wireless charging transmitter. The technical effects of the wireless charging system are the same as those of the wireless charging transmitter and the wireless charging receiver provided in the foregoing embodiments, and will not be described herein.
Drawings
Fig. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a wireless charging system according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating an arrangement of the first transmitting coil, the second transmitting coil, the first receiving coil and the second receiving coil in FIG. 2;
FIG. 4A is a schematic diagram illustrating another arrangement of the first transmitting coil and the second transmitting coil in FIG. 2;
FIG. 4B is a schematic diagram illustrating another arrangement of the first receiving coil and the second receiving coil in FIG. 2;
FIG. 4C is a schematic structural diagram of the first magnetic rod and the magnetic rod coil wound on the first magnetic rod in FIG. 4A;
FIG. 4D is a schematic diagram of a configuration in which the wireless receiver shown in FIG. 4B is disposed on the wireless charging transmitter shown in FIG. 4A;
Fig. 5 is a schematic circuit diagram of another wireless charging system according to an embodiment of the present application;
Fig. 6 is a schematic circuit diagram of a wireless charging system according to the related art;
Fig. 7A is a schematic diagram of a curve of an operating frequency and a voltage transmission gain of a first charging branch according to an embodiment of the present application;
fig. 7B is a schematic diagram of another operating frequency versus voltage transmission gain of the first charging branch according to an embodiment of the present application;
FIG. 8A is a schematic diagram illustrating an operating frequency versus voltage transmission gain of a second charging branch according to an embodiment of the present application;
FIG. 8B is a schematic diagram illustrating another operating frequency versus voltage transmission gain of the second charging branch according to an embodiment of the present application;
fig. 9 is a flowchart of a charging method of a wireless charging system according to an embodiment of the present application;
fig. 10 is a schematic circuit diagram of another wireless charging system according to an embodiment of the present application;
FIG. 11 is a flow chart of a method of S102 in FIG. 9;
FIG. 12 is a flowchart of another method of S102 in FIG. 9;
Fig. 13 is a schematic circuit diagram of another wireless charging system according to an embodiment of the present application;
Fig. 14 is a flowchart of a method of S104 in fig. 9.
Reference numerals:
01-a wireless charging system; 10-a wireless charging transmitter; a 20-wireless charging receiver; a 101-adaptor; 102-a first voltage conversion circuit; 111-a first inverter circuit; 112-a second inverter circuit; 121-a first transmitting coil; 122-a second transmit coil; 201-a first receiving controller; 202-a second receiving controller; 221-a first receiving coil; 222-a second receiving coil; 210-a second voltage conversion circuit; 200-battery; 40-circular coils; 41-a first magnetic bar; 50-magnetic rod coils; 42-a second magnetic bar; 51-groove; 52-warping section; 53-magnetic structure; 31-a first charging branch; 32-a second charging branch; 61-a first emission controller; 62-a second emission controller; 71-a first wireless transceiver; 72-a second wireless transceiver; 73-a charge manager; 231-a first isolation switch; 232-a second disconnector; 81-a first thermistor; 82-a second thermistor.
Detailed Description
The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.
Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.
Furthermore, in the present application, directional terms "upper", "lower", etc. may be defined as including, but not limited to, the orientation in which the components are schematically disposed with respect to each other in the drawings, and it should be understood that these directional terms may be relative concepts, which are used for the description and clarity with respect thereto, and which may be correspondingly varied depending upon the orientation in which the components are disposed with respect to the drawings in the drawings.
In the present application, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. Furthermore, the term "electrically connected" may be a direct electrical connection or an indirect electrical connection via an intermediary.
Embodiments of the present application provide a wireless charging system 01, as shown in fig. 1, the wireless charging system 01 may include a wireless charging Transmitter (TX) 10 and a wireless charging Receiver (RX) 20. The wireless charging transmitter 10 is configured to output an alternating magnetic field to the wireless charging receiver 20 for power transmission.
In some embodiments of the present application, the wireless charging receiver 20 may include a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a smart wearable product (e.g., a smart watch, a smart bracelet), a Virtual Reality (VR) terminal device, an augmented reality (REALITY AR) terminal device, and so on, which have a wireless charging function. The wireless charging receiver 20 may be an electronic product such as a wireless charging electric vehicle, a wireless charging household small-sized electric appliance (e.g., a soymilk machine, a sweeping robot), or an unmanned aerial vehicle. The specific form of the wireless charging receiver 20 described above is not particularly limited in the embodiments of the present application. For convenience of explanation, the wireless charging receiver 20 is exemplified as a mobile phone as shown in fig. 1.
In this case, the wireless charging transmitter 10 may be a charging base as shown in fig. 1. Wireless data communication between the wireless charging transmitter 10 and the wireless charging receiver 20 may be achieved by in-band communication, such as amplitude-shift keying (ASK) modulation. Or wireless data communication may be implemented between the wireless charging transmitter 10 and the wireless charging receiver 20 through an out-of-band communication manner, such as bluetooth (bluetooth), wireless-broadband (WiFi), zigbee (Zigbee), radio Frequency Identification (RFID) technology, long range (long range) wireless technology, and Near Field Communication (NFC) technology.
As shown in fig. 2, the wireless charging transmitter 10 provided by the present application may include an adapter 101, a first voltage conversion circuit 102, a first inverter circuit 111, a first transmitting coil 121, a second inverter circuit 112, and a second transmitting coil 122. Wherein the adapter 101 is capable of converting 220V ac power to dc power (e.g., 5V or 20V, etc.) as required by the charging power. In an embodiment of the present application, the output voltage of adapter 101 may be adjustable as desired within a range of voltages (e.g., 5V-20V).
Further, a first voltage conversion circuit 102 is electrically connected to the adapter 101, and the first voltage conversion circuit 102 is configured to convert direct current output from the adapter 101 into direct current. In this case, the first voltage conversion circuit 102 may be a direct current to direct current (direct current to direct current, DC/DC) voltage converter. For example, the first voltage conversion circuit 102 may be a boost circuit to boost the input dc voltage and output the boosted dc voltage. Alternatively, the first voltage conversion circuit 102 may be a step-down circuit to step down the input dc voltage and output the dc voltage.
The first inverter circuit 111 is electrically connected to the first voltage conversion circuit 102. The first inverter circuit 111 is configured to convert the dc power output from the first voltage conversion circuit 102 into a first square wave signal V hb1. The first inverter circuit 111 may be a full bridge circuit or a half bridge circuit, for example. The first inverter circuit 111 includes a plurality of metal oxide semiconductor (metal oxide semiconductor, MOS) transistors therein. In this case, when the on and off durations of the MOS transistors (i.e., the switching frequency of the MOS transistors) in the first inverter circuit 111 are controlled, the frequency and the duty ratio of the first square wave signal V hb1 output by the first inverter circuit 111 may be controlled. The first square wave signal V hb1 has a plurality of switching periods T, and the switching periods T and the switching frequency F of the MOS transistor in the first inverter circuit 111 satisfy: f=1/T.
In addition, the wireless charging transmitter 10 further includes a first matching capacitor C1 connected in series with the first transmitting coil 121. The first matching capacitor C1 may form a first series resonant network with the first transmitting coil 121. The first transmitting coil 121 is electrically connected to the first inverter circuit 111 through the first matching capacitor C1. In the process of charging and discharging the first matching capacitor C1 and the first transmitting coil 121 by the first inverter circuit 111, the first transmitting coil 121 may be enabled to convert the first square wave signal V hb1 into the first alternating magnetic field. In this case, the operating frequency of the first series resonant network is the same as the switching frequency F of the MOS transistor in the first inverter circuit 111.
Further, a second inverter circuit 112 in the wireless charging transmitter 10 is electrically connected to the adapter 101, and the second inverter circuit 112 is configured to convert the direct current output from the adapter 101 into a second square wave signal V hb2. The second inverter circuit 112 has the same operation principle as the first inverter circuit 111, and will not be described here. Similarly, the wireless charging transmitter 10 may also include a second matching capacitor C2 in series with the second transmitting coil 122. The second matching capacitor C2 may form a second series resonant network with the second transmitting coil 122. The second transmitting coil 122 is electrically connected to the second inverter circuit 112 through the second matching capacitor C2. The second transmitting coil 122 is used for converting the second square wave signal V hb2 into a second alternating magnetic field. The operating frequency of the second series resonant network is the same as the switching frequency F of the MOS transistor in the second inverter circuit 112.
On this basis, as shown in fig. 2, the wireless charging receiver 20 may include a battery 200, a first receiving coil 221, a second receiving coil 222, a first receiving controller 201, and a second receiving controller 202. The first receiving coil 221 is configured to receive the first alternating magnetic field output by the first transmitting coil 121, and convert the first alternating magnetic field into alternating current. Similarly, the first receiving coil 221 may be connected in series with the matching capacitor C3 to form a series resonant network. The first receiving controller 201 is electrically connected to the first receiving coil 221 and the battery 200. The first receiving controller 201 is used for converting the alternating current generated by the first receiving coil 221 into direct current and outputting the direct current to the battery 200 to charge the battery 200.
For example, the first receiving controller 201 may include a rectifier. In some embodiments of the present application, the wireless charging receiver 20 may include a second voltage conversion circuit 210 when the direct current voltage output from the first receiving controller 201 is too large to be directly supplied to the battery 200. The second voltage conversion circuit 210 is electrically connected to the battery 200 and the first receiving controller 201, so that the first receiving controller 201 can be indirectly electrically connected to the battery 200 through the second voltage conversion circuit 210. The second voltage conversion circuit 210 is configured to reduce the voltage (e.g., about 10V) output from the first receiving controller 201 to the charging voltage V bat (e.g., about 4V) of the battery 200.
The second voltage conversion circuit 210 may be, for example, a DC/DC voltage converter, such as a buck (buck) circuit, or a switched capacitor (switched capacitor, SC) circuit. The ratio of the input voltage to the output voltage of the buck circuit can be flexibly adjusted. The ratio of the input voltage to the output voltage of the SC circuit is an integer, but the SC circuit can bear higher input-output voltage difference and has higher voltage conversion efficiency. The present application is not limited to the type of the second voltage converting circuit 210.
In addition, the second receiving controller 202 is electrically connected to the second receiving coil 222, and the second voltage conversion circuit 210 is also electrically connected to the second receiving controller 202 and the battery 200. Accordingly, the second receiving controller 202 may be indirectly electrically connected to the battery 200 through the second voltage conversion circuit 210. The second receiving controller 202 is configured to convert the ac power generated by the second receiving coil 222 into dc power, and output the dc power to the battery 200 to charge the battery 200. Similarly, the second receiving coil 222 may be connected in series with the matching capacitor C4 to form a series resonant network. Further, the second receiving controller 202 may include a rectifier.
The first transmitting coil 121 and the first receiving coil 221 corresponding to the position thereof are the same in type, and the second transmitting coil 122 and the second receiving coil 222 corresponding to the position thereof are the same in type. By way of example, the first transmitting coil 121 and the first receiving coil 221 may each be a circular coil 40 as shown in fig. 3, and the second transmitting coil 122 and the second receiving coil 222 may each be a circular coil 40 as shown in fig. 3. In this case, the operating frequency of the first series resonant network with the first transmitting coil 121, the series resonant network with the first receiving coil 221, and the second series resonant network with the second transmitting coil 122, the series resonant network with the second receiving coil 222 may be below 210 KHz. At this time, the wireless charging system 01 may use a wireless charging standard (Qi) protocol for the circular coil 40 during the charging process.
Or, as yet another example, the first transmitting coil 121 shown in fig. 2 may be a circular coil 40 provided in the wireless charging transmitter 10 as shown in fig. 4A. At this time, the first receiving coil 221 corresponding to the position of the first transmitting coil 121 may be a circular coil 40 provided in the wireless charging receiver 20 as shown in fig. 4B. Further, as shown in fig. 4A, the wireless charging transmitter 10 may further include a first magnetic bar 41. At this time, the second transmitting coil 122 shown in fig. 2 may be the bar magnet coil 50 wound on the first bar magnet 41 as shown in fig. 4A.
For example, as shown in fig. 4C, a groove 51 is provided on the first magnetic rod 41, and the magnetic rod coil 50 may be wound at a position where the groove 51 is located. Since the first magnetic rod 41 is generally small in size, the magnetic rod coil 50 wound around the first magnetic rod 41 is short in length, small in resistance, and concentrated in magnetic flux density, as compared with the circular coil 40. Therefore, the magnetic rod coil 50 has higher energy density, provides larger charging power, and is beneficial to improving the wireless charging speed.
In addition, as shown in fig. 4B, the wireless charging receiver 20 may further include a second magnetic rod 42, and the second receiving coil 222 corresponding to the position of the second transmitting coil 122 may be a magnetic rod coil 50 wound on the second magnetic rod 42. In this way, compared with the scheme that all coils adopt the circular coils, the application adopts the magnetic rod coil 50 with smaller size as part of coils, which is beneficial to reducing the size of products.
In this case, the second series resonant network having the second transmitting coil 122 is different from the first series resonant network having the first transmitting coil 121 in the operating frequency, and the magnetic rod coil having a smaller size is used in the second series resonant network, so that it is possible to have a higher operating frequency, for example, the operating frequency of the second series resonant network may be in the range of 330Khz to 350 Khz.
Alternatively and as yet another example, the first transmitting coil 121 may be a bar magnet coil 50 wound on the first bar magnet 41, and the second transmitting coil 122 may be provided in the circular coil 40 in the wireless charging transmitter 10, as shown in fig. 4A. At this time, as shown in fig. 4B, the first receiving coil 221 corresponding to the position of the first transmitting coil 121 may be a magnetic rod coil 50 wound on the second magnetic rod 42, and the second receiving coil 222 corresponding to the position of the second transmitting coil 122 may be a circular coil 40 provided in the wireless charging receiver 20. In this case, the first series resonant network having the first transmitting coil 121 is different from the second series resonant network having the second transmitting coil 122 in the operating frequency, and the first series resonant network employs a bar magnet coil having a smaller size, so that it is possible to have a higher operating frequency, for example, the operating frequency of the first series resonant network may be about 330KHz to 350 KHz.
As can be seen from the above, the size of the circular coil 40 is larger than the size of the magnetic rod coil 50, so that when the wireless charging receiver 20 is a mobile phone, as shown in fig. 4D, the back surface of the mobile phone has a large cloth space, so that the circular coil 40 in the wireless charging receiver 20 can be disposed on the back surface (the surface on the side opposite to the display surface) of the mobile phone and in contact with the housing of the mobile phone. In addition, the lower part of the mobile phone has a smaller piece of cloth space, so the magnetic rod coil 50 in the wireless charging receiver 20 can be arranged below the mobile phone.
In this case, as shown in fig. 4D, when the cellular phone as the wireless charging receiver 20 is located on the charging base as the wireless charging transmitter 10, the circular coil 40 on the wireless charging transmitter 10 corresponds to the position of the circular coil 40 in the wireless charging receiver 20, so that power transmission between the wireless charging transmitter 10 and the wireless charging receiver 20 can be performed through the circular coil 40 and the circular coil 40 to form one charging branch for charging the wireless charging receiver 20. In addition, the positions of the magnetic rod coil 50 on the wireless charging transmitter 10 and the magnetic rod coil 50 in the wireless charging receiver 20 correspond, so that power transmission can be performed between the wireless charging transmitter 10 and the wireless charging receiver 20 through the magnetic rod coil 50 and the magnetic rod coil 50 to form another charging branch for charging the wireless charging receiver 20.
In some embodiments of the present application, in order to enable accurate positioning of the magnetic rod coil 50 on the wireless charging transmitter 10 and the magnetic rod coil 50 in the wireless charging receiver 20, a magnetic attraction structure 53 as shown in fig. 4B may be provided in the wireless charging transmitter 10 and the wireless charging receiver 20, respectively. For example, the magnetic attraction structure 53 may be a magnetic bar structure made of a magnetic material. Or in other embodiments of the present application, some structure for assisting in positioning may be provided in the wireless charging transmitter 10. For example, the portion of the wireless charging transmitter 10 that carries the wireless charging receiver 20 may be warped upward, forming a warpage 52 as shown in fig. 4B. The warpage portion 52 can limit the wireless charging receiver 20, so as to avoid the wireless charging receiver 20 from sliding down, and the magnetic rod coil 50 on the wireless charging transmitter 10 and the magnetic rod coil 50 in the wireless charging receiver 20 cannot be aligned accurately.
As can be seen from the above, two charging branches are provided between the wireless charging transmitter 10 and the wireless charging receiver 20, and the two charging branches are described below. Specifically, in the wireless charging system 01 configured by the wireless charging transmitter 10 and the wireless charging receiver 20, as shown in fig. 5, the first voltage conversion circuit 102, the first inverter circuit 111, the first transmitting coil 121, the first receiving coil 221, and the first receiving controller 201 may configure the first charging branch 31 of the wireless charging system 01. In addition, the second inverter circuit 112, the second transmitting coil 122, the second receiving coil 222 and the second receiving controller 202 may form a second charging branch 32 of the wireless charging system 01.
In this way, the wireless charging system 01 provided by the embodiment of the present application may have the two charging branches (the first charging branch 31 and the second charging branch 32), and when the two charging branches charge the battery 200 at the same time, compared with the wireless charging system 01 having only one charging branch, the scheme of the present application provides more electric quantity to the battery 200 in the same time, so that the charging efficiency of the battery 200 can be effectively improved, and the charging speed of wireless charging is equivalent to the speed of wired charging.
In order to enable the first charging branch 31 and the second charging branch 32 to supply power to the battery 200 at the same time, the first receiving controller 201 in the first charging branch 31 and the second receiving controller 202 in the second charging branch 32 may be connected in parallel to supply power to the battery 200. Since the two voltage sources cannot be directly connected in parallel, at least one of the first receiving controller 201 and the second receiving controller 202 may be equivalent to a current source. In this case, the battery 200 is charged with the total current formed by combining the currents output from the first receiving controller 201 and the second receiving controller 202 connected in parallel. For example, when the first charging branch 31 and the second charging branch 32 charge the battery 200 at the same time, the charging current I 3 received by the battery 200 is the sum of the first output current I 1 output by the first receiving controller 201 and the second output current I 2 output by the second receiving controller 202, i.e., I 3＝I1+I2.
Based on this, in the process of charging the battery 200 by the first charging branch 31 and the second charging branch 32, the magnitude of the current output by each charging branch needs to be flexibly and accurately adjusted according to the needs of the user. For example, when the battery 200 is fully charged, the output currents of the two charging branches need to be precisely controlled to reduce the currents output from the first charging branch 31 and the second charging branch 32 to the battery 200, so that the charging power supplied to the battery 200 can be reduced when the battery 200 is fully charged. Or in order to avoid the heat generation of the charging coils in the charging branches, which results in the influence of product performance, the output current (the first output current I 1 or the second output current I 2) of the charging branches with the heat generation phenomenon needs to be reduced, so as to achieve the purposes of reducing the temperature of the charging branches and limiting the temperature of the charging branches.
In this case, since the first receiving controller 201 and the second receiving controller 202 supply power to the battery 200 in parallel, in order to avoid that the output ends of the first charging branch 31 and the second charging branch 32 connected in parallel do not generate an impact current, the current output by the first charging branch 31 and the second charging branch 32 is caused to vary following one charging branch with a higher output voltage. Thereby realizing accurate control of the magnitudes of the first output current I 1 and the second output current I 2, the first output voltage V o1 output by the first receiving controller 201 is the same as the second output voltage V o2 output by the second receiving controller 202.
The first output voltage V o1 output by the first receiving controller 201 is the same as the second output voltage V o2 output by the second receiving controller 202, and the first output voltage V o1 is the same as or approximately the same as the second output voltage V o2 on the premise that no impact current is generated at the output ends of the first charging branch 31 and the second charging branch 32 connected in parallel.
On this basis, when the first output current I 1 output by the first charging branch 31 or the second output current I 2 output by the second charging branch 32 needs to be adjusted, the voltage output by the first transmitting coil 121 as the transmitting end of the first charging branch 31 or the voltage output by the second transmitting coil 122 as the transmitting end of the second charging branch 32 needs to be adjusted to meet the requirement that the first charging branch 31 outputs the first output current I 1 or the second output current I 2 output by the second charging branch 32.
In addition, in the embodiment of the present application, as shown in fig. 5, the wireless charging transmitter 10 may be provided with the first voltage conversion circuit 102 only in the first charging branch 31, and the second inverter circuit 112 in the second charging branch 32 may be directly electrically connected to the adapter 101. In this way, the present application can effectively simplify the structure of the wireless charging transmitter 10, relative to the scheme in which the DC/DC voltage converter is provided before the inverter circuit in each of the first charging branch 31 and the second charging branch 32 in the wireless charging system 01 shown in fig. 6.
Based on this, as shown in fig. 5, in the process of adjusting the voltage output from the first transmitting coil 121 or the voltage output from the second transmitting coil 122, there is a difference between the input voltage V in1 of the first inverter circuit 111 and the input voltage V in2 of the second inverter circuit 112. At this time, in order for the first output voltage V o1 output by the first reception controller 201 to be the same as the second output voltage V o2 output by the second reception controller 202, it is required that the first voltage transmission gain k1 of the first charging branch 31 be different from the second voltage transmission gain k2 of the second charging branch 32.
For example, 0 < |k1-k2| is less than or equal to 0.3. When |k1-k2| > 0.3, the difference between the first voltage transmission gain k1 and the second voltage transmission gain k2 is larger, and the voltage at the input end and the voltage at the output end of the first voltage conversion circuit 102 are both larger, resulting in a decrease in the conversion efficiency of the first voltage conversion circuit 102. For example, |k1-k2| may be 0.1, 0.2, or 0.3.
In the first charging branch 31, the ratio of the first output voltage V o1 output by the first receiving controller 201 to the battery 200 and the input voltage V in1 of the first inverter circuit 111 is the first voltage transmission gain k1 of the first charging branch 31. That is, k1=v o1/Vin1. In the second charging branch 32, the ratio of the second output voltage V o2 output from the second receiving controller 202 to the battery 200 and the input voltage V in2 of the second inverter circuit 112 is the second voltage transmission gain k2 of the second charging branch 32. I.e. k2=v o2/Vin2.
The following describes in detail the setting process of the first voltage transmission gain k1 of the first charging branch 31 and the second voltage transmission gain k2 of the second charging branch 32, and the control process of the wireless charging transmitter 10 and the wireless charging receiver 20 in the wireless charging system 01, with reference to the circuit configuration shown in fig. 5.
Example one
In this example, the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 are the circular coils 40 (as shown in fig. 4D), and the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 are the bar magnet coils 50 (as shown in fig. 4D). In this case, the operating frequency of the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 (e.g., in the range of 330 KHz-350 KHz) is higher than the operating frequency of the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 (e.g., 210KHz or less).
Further, in this example, the first voltage conversion circuit 102 in fig. 5 may be a boost (boost) circuit, and the first voltage transmission gain k1 of the first charging branch 31 is smaller than the second voltage transmission gain k2 of the second charging branch 32, that is, k1 < k2. In this case, the number of turns Nb1 of the first receiving coil 221 may be smaller than the number of turns Na1 of the first transmitting coil 121, i.e., nb1 < Na1. At this time, the transformer constituted by the first transmitting coil 121 and the first receiving coil 221, which are circular coils, has a ratio of output voltage to input voltage smaller than 1, so that k1 < 1. In addition, the number of turns Nb2 of the second receiving coil 222 is greater than or equal to the number of turns Na2 of the second transmitting coil 122, i.e., nb2 is equal to or greater than Na2. At this time, the second transmitting coil 122 and the second receiving coil 222, which are magnetic rod coils, are formed such that the ratio of the output voltage to the input voltage of the transformer is greater than or equal to 1, so that k2 is greater than or equal to 1.
The following describes how the output voltage of the first transmitting coil 121, which is the transmitting end of the first charging branch 31, is adjusted in order to satisfy k1 < 1 for the first voltage transmission gain k1 of the first charging branch 31 and to satisfy the first output current I 1 output by the first charging branch 31.
As is clear from the above, the first transmitting coil 121 and the first receiving coil 221, which are the circular coils 40 (shown in fig. 4D), are large in size, and therefore, the allowable degree of positional displacement of the first transmitting coil 121 and the first receiving coil 221 is large (for example, the allowable amount of center displacement of the transmitting coil and the receiving coil may be about ±10mm). Therefore, the coupling coefficient between the first transmitting coil 121 and the first receiving coil 221 can be widely varied, and for example, the coupling coefficient can be set between 0.5 and 0.75.
The coupling coefficient between the transmitting coil and the receiving coil means the degree of tightness of coupling between the transmitting coil and the receiving coil. The coupling coefficient is related to the degree of positional deviation of the two coils, and is higher when the degree of deviation of the transmitting coil and the receiving coil is smaller, and is lower in the opposite. The higher the coupling coefficient of the transmitting coil and the receiving coil, the higher the efficiency of the transmitting coil and the receiving coil in transmitting power.
In this wireless charging system 01, for example, when the output current provided by the charging branch to the battery 200 is different, the load impedance of the wireless receiver 20 is different. When the load impedance of the wireless charging receiver 20 is different in the case where the coupling coefficient between the first transmitting coil 121 and the first receiving coil 221 is 0.75, a relationship curve between the operating frequency of the first series resonant network in which the first transmitting coil 121 is located and the first voltage transmission gain k1 of the first charging branch 31 is shown in fig. 7A. In fig. 7A, the load impedance corresponding to the curve ① is 2.5Ω, the load impedance corresponding to the curve ② is 5Ω, and the load impedance corresponding to the curve ③ is 10Ω. It can be seen that the curves ①, ② and ③ all have the same first voltage transfer gain k1 for the first charging branch 31 at an operating frequency of about 1.5x10 5 KHz, where k1 is about 0.8.
In addition, when the load impedance of the wireless charging receiver 20 is different in the case where the coupling coefficient between the first transmitting coil 121 and the first receiving coil 221 is 0.5, a graph of the relationship between the operating frequency of the first series resonant network in which the first transmitting coil 121 is located and the first voltage transmission gain k1 of the first charging branch 31 is shown in fig. 7B. In fig. 7B, the load impedance corresponding to the curve ① is 2.5Ω, the load impedance corresponding to the curve ② is 5Ω, and the load impedance corresponding to the curve ③ is 10Ω. It can be seen that the curves ①, ② and ③ all have the same first voltage transfer gain k1 for the first charging branch 31 at an operating frequency of about 1.0x10 5 KHz, where k1 is about 0.9.
In this case, as is clear from fig. 7A and 7B, when the coupling coefficient between the first transmitting coil 121 and the first receiving coil 221 varies in the range of 0.5 to 0.75, the change in the load impedance of the wireless charging receiver 20 does not affect the first voltage transmission gain k1 of the first charging branch 31 and the operating frequency of the first series resonant network in which the first transmitting coil 121 is located when the first voltage transmission gain k1 of the first charging branch 31 is in the range of 0.8 to 0.9.
Therefore, when the output currents supplied from the charging branches to the battery 200 are different, in order to satisfy the variation of the load impedance of the wireless charging receiver 20, the first voltage transmission gain k1 of the first charging branch 31 may be selected to be 0.8 or 0.9, so that the first voltage transmission gain k1 may satisfy k < 1. For example, the number of turns of the first receiving coil 221 may be made smaller than the number of turns of the first transmitting coil 121, and the inductance of the first receiving coil 221 is made smaller than the inductance of the first transmitting coil 121, so that the first voltage transmission gain k1 is made smaller than 1.
Further, as is clear from the above, when k1 is 0.8 or 0.9, the frequency offset is 50KHz (when offset from 1.5×10 5 KHz to 1.0×10 5 KHz), the frequency offset is large. Thus, in this example, the first series resonant network in which the first transmitting coil 121 is located is not suitable for adopting a fixed operating frequency.
Based on this, in order to make the first output current I 1 output by the first charging branch 31 satisfy the demand, in the process of adjusting the output voltage of the first transmitting coil 121 as the transmitting end of the first charging branch 31, the voltage output by the adapter 101 may be adjusted between the wireless charging receiver 20 and the wireless charging transmitter 10 through an SCP (Secure copy, based on SSH) communication protocol. In addition, the operating frequency of the first series resonant network where the first transmitting coil 121 is located (i.e., the switching frequency F of the MOS transistor in the first inverter circuit 111) and the output voltage of the first voltage conversion circuit 102 may also be adjusted.
The following describes a manner of adjusting the output voltage of the second transmitting coil 122 as the transmitting end of the second charging branch 32, in order to make the second output current I 2 output by the second charging branch 32 satisfy the requirement, and the second voltage transmission gain k2 of the second charging branch 32 may satisfy k2+.1.
As can be seen from the above, the second transmitting coil 122 and the second receiving coil 222, which are the bar magnet coils 50 (shown in fig. 4D), are smaller in size, and the degree of offset of the second transmitting coil 122 and the second receiving coil 222 is smaller when the magnetic attraction structure 53 (shown in fig. 4D) is employed to assist positioning. Accordingly, the coupling coefficient between the second transmitting coil 122 and the second receiving coil 222 can be changed in a narrow range, and for example, the coupling coefficient can be set between 0.55 and 0.6.
For example, when the load impedance of the wireless charging receiver 20 is different in the case where the coupling coefficient between the second transmitting coil 122 and the second receiving coil 222 is 0.55, the operating frequency of the second series resonant network where the second transmitting coil 122 is located and the second voltage transmission gain k2 of the second charging branch 32 are plotted as shown in fig. 8A. In fig. 8A, the load impedance corresponding to the curve ① is 2.5Ω, the load impedance corresponding to the curve ② is 5Ω, and the load impedance corresponding to the curve ③ is 10Ω. It can be seen that at an operating frequency of about 3.4x 5 KHz, curves ①, ②, and ③ all have the same second voltage transfer gain k2 for the second charging leg 32, where k2 is about 1.
In addition, when the load impedance of the wireless charging receiver 20 is different in the case where the coupling coefficient between the second transmitting coil 122 and the second receiving coil 222 is 0.6, a curve of the relationship between the operating frequency of the second series resonant network where the second transmitting coil 122 is located and the second voltage transmission gain k2 of the second charging branch 32 is shown in fig. 8B. In fig. 8B, the load impedance corresponding to the curve ① is 2.5Ω, the load impedance corresponding to the curve ② is 5Ω, and the load impedance corresponding to the curve ③ is 10Ω. It can be seen that at an operating frequency of about 3.6x10 5 KHz, curves ①, ②, and ③ all have the same second voltage transfer gain k2 for the second charging leg 32, where k2 is about 1.
In this case, as is clear from fig. 8A and 8B, when the coupling coefficient between the second transmitting coil 122 and the second receiving coil 222 varies in the range between 0.55 and 0.6, the change in the load impedance of the wireless charging receiver 20 does not affect the second voltage transmission gain k2 of the second charging branch 32 and the operating frequency adopted by the second series resonant network in which the second transmitting coil 122 is located when the second voltage transmission gain k2 of the second charging branch 32 is in the vicinity of 1.
Therefore, when the output currents provided by the charging branches to the battery 200 are different, the second voltage transmission gain k2 of the second charging branch 32 may be selected to be around 1 in order to satisfy the variation of the load impedance of the wireless charging receiver 20. For example, the number of turns of the second receiving coil 222 may be made equal to the number of turns of the second transmitting coil 122, where k2=1. Furthermore, considering the line impedance in the wireless charging receiver 20, k2 may take a value slightly greater than 1, for example k2=1.05, so that the second voltage transmission gain k2 of the second charging branch 32 may satisfy k2 > 1. For example, the number of turns of the second receive coil 222 may be made slightly greater than the number of turns of the second transmit coil 122, at which time the inductance of the second receive coil 222 is slightly greater than the inductance of the second transmit coil 122, such that the second voltage transmission gain k2 is slightly greater than 1.
Further, as can be seen from the above, when k2=1.05, the frequency offset is 20KHz (when offset from 3.6x10 5 KHz to 3.4x10 5 KHz), the frequency offset is small. Thus, in this example, the second series resonant network in which the second transmit coil 122 is located is suitably at a fixed operating frequency. Moreover, as can be seen from fig. 8A or fig. 8B, when the coupling coefficient between the second transmitting coil 122 and the second receiving coil 222 is determined, the gain curve of the second charging branch 32 is steeper, and when the operating frequency is changed, the voltage transmission gain is changed greatly. Therefore, if the requirement of the second output current I 2 output by the second charging branch 32 is met, it is difficult to obtain high current control accuracy simply by changing the operating frequency of the second series resonant network during the process of adjusting the voltage output by the second transmitting coil 122. In addition, since the operating frequency of the second charging branch 32 is relatively high, for example, in the range of 330KHz to 650KHz, when the operation to the accuracy of the operating frequency is improved, the digital control accuracy of the wireless charging transmitter 10 is required to be too high, which is not beneficial to reducing the cost and the reliability of the product. Therefore, the second series resonant network adopts a fixed operating frequency, that is, the switching frequency F of the MOS transistor in the second inverter circuit 112 adopts a fixed frequency.
Based on this, in order to meet the requirement of the second output current I 2 output by the second charging branch 32, in the process of adjusting the output voltage of the second transmitting coil 122 as the transmitting end of the second charging branch 32, the voltage output by the adapter 101 may be adjusted between the wireless charging receiver 20 and the wireless charging transmitter 10 through the SCP communication protocol.
To sum up, in the present example, the first voltage transmission gain k1 of the first charging branch 31 satisfies k1 < 1, for example, k1 is 0.8 or 0.9, and the second voltage transmission gain k2 of the second charging branch 32 satisfies k2 Σ1, for example, k2 is 1.05. Thus, as shown in fig. 5, when the first receiving controller 201 and the second receiving controller 202 are connected in parallel, in order to accurately control the magnitudes of the first output current I 1 and the second output current I 2 as required, it is avoided that the currents output by the first receiving controller 201 and the second receiving controller 202 follow a charging branch having a higher output voltage, so that the first output voltage V o1 output by the first receiving controller 201 and the second output voltage V o2 output by the second receiving controller 202 may be the same.
As can be seen from the above, the wireless charging system 01 includes the first charging branch 31 and the second charging branch 32 as shown in fig. 5, in which case, the working procedure of the wireless charging system 01 may include S101 to S107 as shown in fig. 9 according to the heating condition of the coil and the supporting condition of the charging base.
S101, starting.
The wireless charging receiver 20 as the mobile phone is placed on the wireless charging transmitter 10 as the charging base, and the wireless charging system 01 formed by the wireless charging transmitter 10 and the wireless charging receiver 20 performs S101 described above, so that the communication connection is established between the wireless charging transmitter 10 and the wireless charging receiver 20 through the in-band or out-of-band communication manner described above.
For example, when a communication connection is established between the wireless charging transmitter 10 and the wireless charging receiver 20 in an out-of-band communication manner, as shown in fig. 10, the wireless charging transmitter 10 includes a first wireless transceiver 71, and the wireless charging receiver 20 includes a second wireless transceiver 72. The first wireless transceiver 71 and the second wireless transceiver 72 may communicate wirelessly using out-of-band communication. By way of example, the first wireless transceiver 71 and the second wireless transceiver 72 may be bluetooth controllers.
In some embodiments of the present application, the wireless charging receiver 20 as a mobile phone is placed on the wireless charging transmitter 10 as a charging base, and the first transmitting coil 121 in the wireless charging transmitter 10 and the first receiving coil 221 in the wireless charging receiver 20 are aligned, the first transmitting coil 121 is in a state of being in place, and the first charging branch 31 where the first transmitting coil 121 and the first receiving coil 221 are located can operate. In addition, the second transmitting coil 122 in the wireless charging transmitter 10 and the second receiving coil 222 in the wireless charging receiver 20 are aligned in position, the second transmitting coil 122 is in an in-situ state, and the second charging branch 32 in which the second transmitting coil 122 and the second receiving coil 222 are located is operable. In this case, the wireless charging system 01 performs S102 and S103 in fig. 9 when the first charging branch 31 and the second charging branch 32 can operate simultaneously.
S102, the first charging branch 31 and the second charging branch 32 operate simultaneously. In this case, the wireless charging system 01 performs the method of S102 described above, and may specifically include S201 to S204 as shown in fig. 11.
S201, a first in-place instruction of the first transmitting coil 121 and a second in-place instruction of the second transmitting coil 122 are transmitted.
The wireless charging transmitter 10 may perform S201 described above. Specifically, the first transmission controller 61 in the wireless charging transmitter 10 shown in fig. 10 may transmit the first on-bit instruction to the first wireless transceiver 71. The first bit instruction is used to instruct the center offset between the first receiving coil 221 and the first transmitting coil 121 in the wireless charging receiver 20 to satisfy the offset allowed by normal charging, for example, about ±10mm. At this time, the wireless charging transmitter 10 as a charging base supports charging the battery 200 using the first charging branch 31.
Further, the second transmission controller 62 in the wireless charging transmitter 10 shown in fig. 10 may transmit the above-described second in-place instruction to the first wireless transceiver 71. The second bit instruction is used to instruct the offset between the second receiving coil 222 and the second transmitting coil 122 in the wireless charging receiver 20 to meet the offset allowed by normal charging. As can be seen from the above description, the second transmitting coil 122 and the second receiving coil 222 are magnetic rod coils 50 (as shown in fig. 4D), which have smaller sizes, and the second transmitting coil 122 and the second receiving coil 222 have smaller offset degree and high alignment accuracy under the auxiliary positioning action of the magnetic attraction structure 53 (as shown in fig. 4D). At this time, the wireless charging transmitter 10 as a charging base supports charging the battery 200 using the second charging branch 32. Next, the first wireless transceiver 71 in the wireless charging transmitter 10 receives the first and second on-site instructions and transmits to the wireless charging receiver 20.
S202, a first power request is sent.
To perform S202 described above, the wireless charging receiver 20 may include a charging manager (charger) 73 as shown in fig. 10. The charge manager 73 may be electrically connected to the battery 200 and the second wireless transceiver 72. In the case where the wireless charge receiver 20 includes a system on chip (SoC), the charge manager 73 may be integrated within the SoC or provided separately from the SoC and electrically connected thereto.
When the battery 200 can be charged rapidly with high power, the wireless charging receiver 20, in performing the above-described S202, the charging manager 73 may generate a first power request and transmit the first power request to the wireless charging transmitter 10 through the second wireless transceiver 72. The first power request is used to indicate that the charging power provided by the wireless charging transmitter 10 to the battery 200 is the maximum charging power P max of the battery 200.
By way of example, conditions for high power fast charging of battery 200 may include: the battery 200 has a charge level lower than a preset charge level, which is near and less than full charge. Or the temperature of the battery 200 is in a normal temperature state. The charge manager 73 may internally provide an electricity meter and a thermistor to collect the electricity and temperature of the battery 200, respectively. Further, the condition under which the battery 200 can be charged rapidly with high power may be that the temperature of the first receiving coil 221 and the temperature of the second receiving coil 222 are in a normal temperature state.
S203, according to the first power request, generating a first charging power P1 and a second charging power P2.
Specifically, in the process of performing the above S203, the wireless charging transmitter 10, as shown in fig. 10, may receive the above first power request through the first wireless transceiver 71, and input a first pulse width modulation (pulse width modulation, PWM) signal to the first voltage conversion circuit 102 according to the first power request. By controlling the duty ratio of the first PWM signal, the magnitude of the output voltage of the first voltage conversion circuit 102 can be controlled. When the first voltage converting circuit 102 is a boost circuit, the duty cycle of the first PWM signal may be inversely proportional to the output voltage of the first voltage converting circuit 102. The duty cycle of the first PWM signal may be reduced to increase the output voltage of the first voltage conversion circuit 102 to achieve high power charging. In addition, when the first voltage conversion circuit 102 is a buck circuit, the duty cycle of the first PWM signal may be proportional to the output voltage of the first voltage conversion circuit 102.
As can be seen from the above, in the case where the first transmitting coil 121 and the first receiving coil 221 are circular coils, and the first voltage transmission gain k1 of the first charging branch 31 can be selected to be 0.8 or 0.9, the frequency offset of the first charging branch 31 is 50KHz, and the frequency offset is large. The first transmitting coil 121 need not operate at a fixed frequency. The operating frequency of the first transmitter coil 121 can be adjusted to increase the output power.
In this case, the first emission controller 61 may further input the second PWM signal to the first inverter circuit 111 according to the first power request, and may control the frequency of the first square wave signal V hb1 output by the first inverter circuit 111 by controlling the frequency of the second PWM signal so that the first inverter circuit 111 can output the first charging power P1. Wherein the frequency of the second PWM signal is inversely proportional to the output current of the first inverter circuit 111. Therefore, the frequency of the second PWM signal can be reduced, and the output current of the first inverter circuit 111 can be increased to realize high-power charging.
In addition, as can be seen from the above, in the case that the second transmitting coil 122 and the second receiving coil 222 are magnetic rod coils, and the second voltage transmission gain k2 of the second charging branch 32 can be selected to be 1.05, the frequency offset of the second charging branch 32 is 20KHz, and the frequency offset is small. The first transmitter coil 121 is adapted to operate at a fixed frequency. The second emission controller 62 may thus input the third PWM signal having the fixed frequency to the second inverter circuit 112 so that the first inverter circuit 111 can output the second charging power P2.
In other embodiments of the present application, in order to implement high-power charging, the first power request generated by charging manager 73 may be sent to adapter 101 by using an SCP communication protocol between wireless charging receiver 20 and adapter 101, so that adapter 101 may increase the output voltage according to the first power request, so that the voltages received by first voltage conversion circuit 102 and second inverter circuit 112 are both increased, and thus wireless charging transmitter 10 may output the first charging power P1 and the second charging power P2, so as to perform high-power charging on the battery.
S204, the first charging power P1 and the second charging power P2 are transmitted.
In performing the above-described S204, the wireless charging transmitter 10 may transmit the first charging power P1 to the first receiving coil 211 by transmitting the first alternating magnetic field to the first transmitting coil 121. The second transmitting coil 122 may transmit the second charging power P2 to the second receiving coil 222 by transmitting a second alternating magnetic field.
S103, the battery 200 is charged with the third charging power P3. Wherein p3=p1+p2; p3=p max.
In performing the above-described S205 process, the wireless charging receiver 20 may convert the alternating current output from the first receiving coil 221 into direct current and output the first output voltage V o1 and the first output current I 1 to the battery 200 to charge the battery 200 with the first charging power P1 (p1=v o1×I1). The first receiving controller 202 may convert the alternating current output from the second receiving coil 222 into direct current and output a second output voltage V o2 and a second output current I 2 to the battery 200 to charge the battery 200 with a second charging power P2 (p1=v o2×I2). At this time, the total current I 3 provided to the battery 200 by the first charging branch 31 and the second charging branch 32 is the sum of the first output current I 1 and the second output current I. By reasonably proportioning the magnitudes of the first output current I 1 and the second output current I 2, for example, p1=0.3×p max,P2＝0.7×Pmax, the charging power provided by the wireless charging transmitter 10 to the battery 200 can be made to be the maximum charging power P max of the battery 200.
The above description is given taking the case where the charging power provided by the wireless charging transmitter 10 to the battery 200 is the maximum charging power P max of the battery 200, and the high-power quick charging of the battery 200 is taken as an example. In other embodiments of the present application, when the condition for high-power quick charge of the battery 200 is not satisfied, the wireless charging system 01 performs the method of S102 described above, and may specifically include S301 to S304 as shown in fig. 12.
S301, a first in-place instruction of the first transmitting coil 121 and a second in-place instruction of the second transmitting coil 122 are transmitted. S301 is the same as S201, and is not described in detail herein.
S302, a second power request is sent.
When the above conditions for high-power quick charging of the battery 200 are not satisfied, for example, the temperature of the first receiving coil 221 and the temperature of the second receiving coil 222 are too high, the wireless charging receiver 20 may generate a second power request and transmit the second power request to the wireless charging transmitter 10 through the second wireless transceiver 72 in the process of performing S202 described above. The second power request is used to instruct the wireless charging transmitter 10 to charge the battery 200 with a small power, and thus the charging power provided by the wireless charging transmitter 10 to the battery 200 is less than the maximum charging power P max described above.
In some embodiments of the present application, in order to detect the temperature of the first receiving coil 221 and the temperature of the second receiving coil 222, as shown in fig. 13, the wireless charging receiver 20 may further include a first thermistor 81 disposed near the first receiving coil 221 and a second thermistor 82 disposed near the second receiving coil 222. When the micro control unit (micro controller unit, MCU) is integrated inside the first receiving controller 201, the first thermistor 81 and the second thermistor 82 may be electrically connected to the MCU in the first receiving controller 201. Alternatively, the first thermistor 81 and the second thermistor 82 may be electrically connected to the charge manager 73. For convenience of explanation, the first thermistor 81 and the second thermistor 82 are electrically connected to the MCU in the first receiving controller 201.
In this case, before the wireless charging receiver 20 performs S202 described above, the first thermistor 81 senses the first temperature T 1 of the first receiving coil 221 and transmits the first temperature T 1 to the first receiving controller 201. In addition, the second thermistor 82 senses the second temperature T 2 of the second receiving coil 222 and transmits the second temperature T 2 to the first receiving controller 201. The first receiving controller 201 may be further electrically connected to the charge manager 73, and the first receiving controller 201 may compare temperatures sensed by the first thermistor 81 and the second thermistor 82, and send a control instruction to the charge manager 73 when a preset temperature is exceeded, so that the charge manager 73 can generate the second power request.
For example, in order to perform closed loop control on the first output current I 1 output by the first receiving controller 201 and the second output current I 2 output by the second receiving controller 202, the MCU integrated in the first receiving controller 201 may calculate the first current error Δi 1 and the second current error Δi 2. The first current error Δi 1 is an absolute value of a difference between the first output current I 1 and the first target current I G1, i.e., Δi 1＝|I1-IG1 |, which are output from the first receiving controller 201 to the battery 200. The second current error Δi 2 is the absolute value of the difference between the second output current I 2 and the second target current I G2, i.e., Δi 2＝|I2-IG2.
For example, the first receiving controller 201 may calculate the first current error Δi 1 and the second current error Δi 2 according to a preset charging strategy. For example, the preset charging strategy may include a first mapping relationship between the first temperature T 1 and the first target current I G1, and a second mapping relationship between the second temperature T 2 and the second target current I G2. For example, the first mapping relationship includes a plurality of first temperatures T 1 and a plurality of first target currents I G1, where each value of the first temperatures T 1 matches a value of a first target current I G1. Similarly, the second mapping relationship includes a plurality of second temperatures T 2 and a plurality of second target currents I G2, where each value of the second temperatures T 2 matches a value of the second target current I G2.
In this case, the first receiving controller 201 may obtain a first target current I G1 matching the magnitude of the first temperature T 1 according to the first temperature T 1 and the first mapping relationship, and calculate an absolute value |i 1-IG1 | of a difference between the first output current I 1 and the first target current I G1, to obtain a first current error Δi 1(△I1＝|I1-IG1 |. In addition, the first receiving controller 201 obtains a second target current I G2 matching the value of the second temperature T 2 according to the second temperature T 2 and the second mapping relationship, and calculates an absolute value |i 2-IG2 | of a difference between the second output current I 2 and the second target current I G2, to obtain a second current error Δi 2(△I2＝|I2-IG2 |.
In the above description, when the MCU is integrated into the first reception controller 201, the first reception controller 201 calculates the first current error Δi 1 and the second current error Δi 2. In other embodiments of the present application, when the MCU is integrated into the second receiving controller 202, the second wireless transceiver 72 may calculate the first current error Δi 1 and the second current error Δi 2. Alternatively, the temperature acquired by the first thermistor 81 and the second thermistor 82 may be transmitted to the first transmission controller 61 or the second transmission controller 62 in the wireless charging transmitter 10 through the second wireless transceiver 72, and the first current error Δi 1 and the second current error Δi 2 may be calculated by the first transmission controller 61 or the second transmission controller 62. Alternatively, when the first thermistor 81 and the second thermistor 82 are electrically connected to the charge manager 73, the charge manager 73 may calculate the first current error Δi 1 and the second current error Δi 2 based on the first temperature T 1 and the second temperature T 2. Next, the charge manager 73 may generate a power request, such as the second power request described above, based on the first current error Δi 1 and the second current error Δi 2 described above.
S303, reducing at least one of the first charging power P1 and the second charging power P2 according to the second power request.
Specifically, in the process of performing the above S303, the wireless charging transmitter 10 may receive the above second power request through the first wireless transceiver 71, and input the first PWM signal to the first voltage conversion circuit 102 according to the second power request. By controlling the duty ratio of the first PWM signal, the output voltage of the first voltage conversion circuit 102 can be reduced.
As can be seen from the above, in the case where the first transmitting coil 121 and the first receiving coil 221 are circular coils, and the first voltage transmission gain k1 of the first charging branch 31 can be selected to be 0.8 or 0.9, the frequency offset of the first charging branch 31 is 50KHz, and the frequency offset is large. The first transmitting coil 121 does not need to operate at a fixed frequency, and thus the operating frequency of the first transmitting coil 121 can be adjusted to achieve the purpose of reducing the output power. In this case, the first emission controller 61 may also input the second PWM signal to the first inverter circuit 111 according to the second power request, and reduce the output current of the first inverter circuit 111 by controlling the frequency of the second PWM signal, thereby achieving the purpose of reducing the first charging power P1.
In addition, as can be seen from the above, in the case that the second transmitting coil 122 and the second receiving coil 222 are magnetic rod coils, and the second voltage transmission gain k2 of the second charging branch 32 can be selected to be 1.05, the frequency offset of the second charging branch 32 is 20KHz, and the frequency offset is small. The first transmitter coil 121 is adapted to operate at a fixed frequency. The second emission controller 62 can thus operate the first inverter circuit 111 at a fixed frequency without changing the frequency of inputting the third PWM signal to the second inverter circuit 112.
In this case, in order to reduce the second charging power P2 output by the first inverter circuit 111, the second power request generated by the charging manager 73 may be sent to the adapter 101 through the SCP communication protocol between the wireless charging receiver 20 and the adapter 101, so that the adapter 101 may reduce the output voltage according to the second power request, so that the voltages received by the first voltage conversion circuit 102 and the second inverter circuit 112 are reduced, thereby achieving the purpose of reducing the first charging power P1 and the second charging power P2 output by the wireless charging transmitter 10.
S304, the first charging power P1 and the second charging power P2 are transmitted. S304 is the same as S204, and will not be described in detail here.
S103, the battery 200 is charged with the third charging power P3. Wherein p3=p1+p2; p3 < P max.
In the process of performing S205 described above, since the first charging power P1 received by the first receiving coil 221 is reduced, the first output current I 1 outputted by the first receiving controller 201 is the same as or close to the first target current I G1, so that the first charging power P1 supplied by the first receiving controller 201 to the battery 200 is reduced.
Or when the second charging power P2 received by the second receiving coil 222 decreases, the second output current I 2 outputted by the second receiving controller 202 is the same as or close to the second target current I G2, so that the second charging power P2 provided by the second receiving controller 202 to the battery 200 decreases. In this way, the third charging power P3 provided by the first charging branch 31 and the second charging branch 32 to the battery 200 is smaller than the maximum charging power P max of the battery 200, so as to charge the battery 200 with low power.
In this way, when the temperature of the receiving end coil in any one of the first charging branch 31 and the second charging branch 32 is higher, the wireless charging system 01 may obtain a target current matching the target temperature according to the target temperature of the expected cooling according to the preset charging strategy, and then adjust the output voltages of the adapter 101 and the first voltage conversion circuit 102 in the wireless charging transmitter 10. Or in combination with adjusting the frequency of the first inverter circuit 111, the first output current I 1 output by the first charging branch 31 may be the same as or close to the first target current I G1. It is thus possible to distribute the magnitudes of the first output current I 1 and the second output current I 2 in a reasonable proportion. Under the condition, the temperature of one path of charging branch circuit with the reduced output current can be reduced to the target temperature, and finally the purpose of reducing the temperature of the receiving end coil is achieved. It should be noted that, the present application does not limit the mapping relationship between the temperature and the target current in the preset charging strategy. For example, in the case where the temperature of any one of the first receiving coil 221 and the second receiving coil 222 is less than or equal to 28 ℃, the target current value corresponding to the temperature of less than or equal to 28 ℃ may be made greater than zero when the above-described map is set. Thus, the first output current I 1 output by the first charging branch 31 and the second output current I 2 output by the second charging branch 32 are both greater than zero.
Or in other embodiments of the present application, when the temperature of any one of the first receiving coil 221 and the second receiving coil 222 is greater than or equal to 42 ℃, in order to avoid the damage of electronic components caused by the overheat of the wireless charging receiver 20, when the mapping relationship is set, the target current value corresponding to 42 ℃ is set to 0, so that one charging branch with a higher temperature can stop working in time, and the charging branch is prevented from providing an output current to the battery 200, thereby achieving the purpose of reducing the temperature. For example, when the target current value of the first charging branch 31 is 0, the first emission controller 61 may stop outputting the first PWM signal to the first voltage conversion circuit 102 and stop outputting the second PWM signal to the first inverter circuit 111, thereby stopping the first voltage conversion circuit 102 and the first inverter circuit 111. At this time, the first charging branch 31 stops operating. Similarly, when the target current value of the second charging branch 32 is 0, the second emission controller 62 may stop outputting the above-described third PWM signal to the second inverter circuit 112, thereby stopping the second inverter circuit 112 from operating. At this time, the second charging branch 32 stops operating.
The above description is given by taking the condition that the temperature of the first receiving coil 221 and the temperature of the second receiving coil 222 are too high as the conditions that the high-power quick charge of the battery 200 is not satisfied, and the output power of the first charging branch 31 and the second charging branch 32 is reduced. When the charge of the battery 200 approaches full charge. Or when the temperature of the battery 200 is in a very normal temperature state as a condition that the condition of high-power rapid charging of the battery 200 is not satisfied, the process of reducing the output power of the first charging branch 31 and the second charging branch 32 is the same, and will not be described again here. When a communication connection is established between the wireless charging transmitter 10 and the wireless charging receiver 20 in the wireless charging system 01 by ASK modulation in-band communication, the in-band communication may cause random jitter in the voltage output from the first receiving controller 201 and the second receiving controller 202 to the battery 200 in the wireless charging receiver 20, and an unstable phenomenon may occur. Based on this, when the first charging branch 31 and the second charging branch 32 are operated at the same time, if the voltages output from the first receiving controller 201 and the second receiving controller 202 are unstable, it cannot be ensured that the voltages output from the first receiving controller 201 and the second receiving controller 202 are close to or the same as each other, so that the currents output from the first charging branch 31 and the second charging branch 32 cannot be further precisely controlled. Thus, when the first charging branch 31 and the second charging branch 32 operate simultaneously, an out-of-band communication (e.g., bluetooth) mode is required to establish a communication connection.
The charging process of the wireless charging system 01 is described above taking the case where the coils in the first charging branch 31 and the second charging branch 32 are both in the on-site state as an example. In some embodiments of the present application, the wireless charging receiver 20 as a mobile phone is placed on the wireless charging transmitter 10 as a charging base, and the first transmitting coil 121 in the wireless charging transmitter 10 and the first receiving coil 221 in the wireless charging receiver 20 are aligned, the first transmitting coil 121 is in a state of being in place, and the first charging branch 31 where the first transmitting coil 121 and the first receiving coil 221 are located can operate. In addition, the second transmitting coil 122 in the wireless charging transmitter 10 and the second receiving coil 222 in the wireless charging receiver 20 are not aligned in position, the second transmitting coil 122 is in a non-in-place state, and the second charging branch 32 in which the second transmitting coil 122 and the second receiving coil 222 are located is not operational. For example, when the handset is placed laterally on the charging dock, the positions of the second transmit coil 122 and the second receive coil 222 are not aligned. In this case, S104 and S105 as shown in fig. 9 may be performed.
S104, the first charging branch 31 works alone. The wireless charging system 01 performs the method of S104 described above, and may specifically include S401 to S404 as shown in fig. 14.
S401, a first in-place instruction of the first transmitting coil 121 is sent. The function of the first bit instruction is as described above, and will not be described again here.
S402, a first power request is sent.
Similarly, when the battery 200 can be charged rapidly with high power, the charging manager 73 may generate a first power request and transmit the first power request to the wireless charging transmitter 10 through the second wireless transceiver 72 in the process of performing S402. The first power request is used to indicate that the charging power provided to the battery 200 by the first charging branch 31 in the wireless charging transmitter 10 is the maximum charging power P max of the battery 200.
S403, generating a first charging power P1 according to the first power request.
Similarly, in the process of executing the step S203, the first transmitting controller 61 may receive the first power request through the first wireless transceiver 71, control the duty ratio of the first PWM signal, and control the magnitude of the output voltage of the first voltage converting circuit 102.
As can be seen from the above, when the first transmitting coil 121 and the first receiving coil 221 are circular coils, the frequency offset of the first charging branch 31 is 50KHz, and the frequency offset is large. The operating frequency of the first transmitter coil 121 can be adjusted to increase the output power. In this case, the first transmission controller 61 may also control the frequency of the first square wave signal V hb1 output by the first inverter circuit 111 by controlling the frequency of the second PWM signal according to the first power request so that the first inverter circuit 111 can output the first charging power P1.
S404, transmitting the first charging power P1.
In performing the above-described S204, the wireless charging transmitter 10 may transmit the first charging power P1 to the first receiving coil 211 by transmitting the first alternating magnetic field to the first transmitting coil 121.
S105, the battery is charged with the first charging power P1. Wherein p1=p max.
In performing the above-described S105 process, the wireless charging receiver 20 may convert the alternating current output from the first receiving coil 221 into direct current and output the first output voltage V o1 and the first output current I 1 to the battery 200 to charge the battery 200 with the first charging power P1 (p1=v o1×I1). Since p1=p max, the charging power provided by the wireless charging transmitter 10 to the battery 200 can be made to be the maximum charging power P max of the battery 200.
Similarly, when the above condition of high-power quick charge of the battery 200 is not satisfied, for example, the temperature of the first receiving coil 221 is too high, the above charge manager 73 may generate a second power request such that the wireless charge transmitter 10 decreases the output first charge power P1, thereby making the charge power provided by the wireless charge transmitter 10 to the battery 200 smaller than the maximum charge power P max (i.e., P1 < P max) of the battery 200 to achieve low-power charge.
Or in other embodiments of the present application, the wireless charging receiver 20 as a mobile phone is placed on the wireless charging transmitter 10 as a charging base, and the positions of the first transmitting coil 121 in the wireless charging transmitter 10 and the first receiving coil 221 in the wireless charging receiver 20 are not aligned, the first transmitting coil 121 is in a non-in-place state (for example, the first transmitting coil 121 is subject to loose installation position offset), and the first charging branch 31 where the first transmitting coil 121 and the first receiving coil 221 are located cannot operate. In addition, the second transmitting coil 122 in the wireless charging transmitter 10 and the second receiving coil 222 in the wireless charging receiver 20 are aligned in position, the second transmitting coil 122 is in an in-situ state, and the second charging branch 32 in which the second transmitting coil 122 and the second receiving coil 222 are located is operable. In this case, S106 and S107 as shown in fig. 9 may be performed.
S106, the second charging branch 32 operates alone.
The procedure of the second charging branch 32 alone is the same as the procedure of the first charging branch 31 alone, and will not be described again here.
S107, the battery 200 is charged with the second charging power P2. Wherein p2=p max.
The charging power provided by the second charging branch 32 to the battery 200 is the maximum charging power P max of the battery 200. Similarly, when the above condition of high-power quick charging of the battery 200 is not satisfied, for example, the temperature of the second receiving coil 222 is too high, the above charging manager 73 may generate a second power request such that the wireless charging transmitter 10 decreases the output second charging power P2, thereby making the charging power provided by the wireless charging transmitter 10 to the battery 200 smaller than the maximum charging power P max (i.e., P2 < P max) of the battery 200 to achieve low-power charging.
In addition, when the first charging branch 31 or the second charging branch 32 is operated alone, in order to avoid that the other charging branch starts to operate due to a malfunction, the wireless charging receiver 20 may further include a first isolation switch 231 and a second isolation switch 232 as shown in fig. 10.
The first isolation switch 231 is electrically connected to the first receiving controller 201 and the second voltage converting circuit 210, and the first receiving controller 201 is configured to control the first isolation switch 231 to be turned on and off. The second isolation switch 232 is electrically connected to the second receiving controller 202 and the second voltage conversion circuit 210. The second receiving controller 202 is configured to control the second isolating switch 232 to be turned on and off. When the first charging branch 31 works alone, the first receiving controller 201 controls the first isolating switch 231 to be turned on, and signal transmission can be performed between the first receiving controller 201 and the second voltage converting circuit 210. The second receiving controller 202 controls the second isolating switch 232 to be opened, and the second receiving controller 202 is disconnected from the second voltage converting circuit 210. Conversely, when the second charging branch 32 works alone, the second receiving controller 202 controls the second isolating switch 232 to be turned on, and signal transmission can be performed between the second receiving controller 202 and the second voltage converting circuit 210. The first receiving controller 201 controls the first isolating switch 231 to be opened, and the first receiving controller 201 is disconnected from the second voltage converting circuit 210.
In summary, in the working process of the wireless charging system 01, the first charging branch 31 or the second charging branch 32 can be independently controlled to work independently according to the supporting condition of the charging base and the temperature limiting measure of the charging branch. In addition, the first charging branch 31 and the second charging branch 32 can be controlled to work simultaneously, so that the charging point mode is more flexible. When the wireless charging system 01 implements charging in any of the above ways, the charging process may be ended. For example, the wireless charging receiver 20 sends out the warning information of the charging completion. The warning information can adopt a light warning mode, a sound warning mode, a warning image displaying mode or the like to remind the user that the charging process is finished.
Example two
A difference from the example is that, in this example, the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 shown in fig. 14 are the magnetic rod coil 50 (as shown in fig. 4D), and the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 are the circular coil 40 (as shown in fig. 4D). In this case, the operating frequency of the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 (e.g., in the range of 330 KHz-350 KHz) is higher than the operating frequency of the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 (e.g., 210KHz or less).
In addition, the first voltage conversion circuit 102 in fig. 14 is a boost circuit, and the first voltage transmission gain k1 of the first charging branch 31 is smaller than the second voltage transmission gain k2 of the second charging branch 32, that is, k1 < k2. In this case, the number of turns Nb1 of the first receiving coil 221, the number of turns Na1 of the first transmitting coil 121, the number of turns Nb2 of the second receiving coil 222, and the number of turns Na2 of the second transmitting coil 122 are set as described above, and are not repeated here.
The setting process that the first voltage transmission gain k1 of the first charging branch 31 satisfies k1 < 1 and the second voltage transmission gain k2 of the second charging branch 32 satisfies k2 being greater than or equal to 1 is the same as that described above, and the description is omitted here. In addition, according to the temperature limiting measure of the charging branch, when the first output current I 1 output by the first charging branch 31 and the second output current I 2 output by the second charging branch 32 meet different needs, the adjustment manner of the voltage output by the first transmitting coil 121 as the transmitting end of the first charging branch 31 and the adjustment manner of the voltage output by the second transmitting coil 122 as the transmitting end of the second charging branch 32 are the same, and are not repeated herein.
The difference is that, since the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 are the circular coils 40 in this example, the frequency offset of the second charging branch 32 where the second transmitting coil 122 and the second receiving coil 222 are located may be larger, for example, 50KHz. The second transmitting coil 122 may not need to operate at a fixed frequency and thus the operating frequency of the second transmitting coil 122 may be adjusted during the adjustment of the second output current I 2 output by the second charging branch 32. In this case, the second emission controller 62 may input the second PWM signal to the first inverter circuit 111 according to the power request issued by the charge manager 73, and achieve the purpose of adjusting the output current of the first inverter circuit 111 by controlling the frequency of the second PWM signal.
The above-described example one and example two are each described taking the first voltage conversion circuit 102 in the wireless charging transmitter 10 as an example of a step-up circuit. In other embodiments of the present application, the first voltage conversion circuit 102 is a buck (buck) circuit.
Example three
The present example is the same as the example one in that the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 in fig. 14 are the above-described circular coils 40 (as shown in fig. 4D), and the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 are the above-described bar magnet coils 50 (as shown in fig. 4D). In this case, the operating frequency of the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 (e.g., in the range of 330 KHz-350 KHz) is higher than the operating frequency of the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 (e.g., 210KHz or less).
The present example is different from example one in that the first voltage conversion circuit 102 in fig. 14 is a step-down circuit. In this case, the first voltage transmission gain k1 of the first charging branch 31 is greater than the second voltage transmission gain k2 of the second charging branch 32, i.e. k1 > k2. Based on this, the number of turns Nb1 of the first receiving coil 221 may be greater than the number of turns Na1 of the first transmitting coil 121, i.e., nb1 > Na1. At this time, the transformer constituted of the first transmitting coil 121 and the first receiving coil 221, which are circular coils, has a ratio of output voltage to input voltage > 1 such that k1 > 1. In addition, the number of turns Nb2 of the second receiving coil 222 is less than or equal to the number of turns Na2 of the second transmitting coil 122, i.e., nb2 is less than or equal to Na2. At this time, the transformer formed by the second transmitting coil 122 and the second receiving coil 222, which are bar coils, has a ratio of output voltage to input voltage of less than or equal to 1 so that k2.ltoreq.1.
Similarly, the setting process that the first voltage transmission gain k1 of the first charging branch 31 satisfies k1 >1 and the second voltage transmission gain k2 of the second charging branch 32 satisfies k2 less than or equal to 1 is the same as that described above and will not be repeated here. In addition, according to the temperature limiting measure of the charging branch, when the first output current I 1 output by the first charging branch 31 and the second output current I 2 output by the second charging branch 32 meet different needs, the adjustment manners of the voltage output by the first transmitting coil 121 as the transmitting end of the first charging branch 31 and the adjustment manners of the voltage output by the second transmitting coil 122 as the transmitting end of the second charging branch 32 are the same as those described above, and are not repeated here.
Example four
The present example is the same as example two in that the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 shown in fig. 14 are the magnetic rod coil 50 described above (as shown in fig. 4D), and the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 are the circular coil 40 described above (as shown in fig. 4D). In this case, the operating frequency of the first transmitting coil 121 and the first receiving coil 221 in the first charging branch 31 (e.g., in the range of 330 KHz-350 KHz) is higher than the operating frequency of the second transmitting coil 122 and the second receiving coil 222 in the second charging branch 32 (e.g., 210KHz or less).
The present example is different from example two in that the first voltage conversion circuit 102 in fig. 14 is a step-down circuit. In this case, the first voltage transmission gain k1 of the first charging branch 31 is greater than the second voltage transmission gain k2 of the second charging branch 32, i.e. k1 > k2. Based on this, the setting manners of the number of turns Nb1 of the first receiving coil 221, the number of turns Na1 of the first transmitting coil 121, the number of turns Nb2 of the second receiving coil 222, and the number of turns Na2 of the second transmitting coil 122 are as described above, and are not repeated here.
Similarly, the setting process that the first voltage transmission gain k1 of the first charging branch 31 satisfies k1 >1 and the second voltage transmission gain k2 of the second charging branch 32 satisfies k2 less than or equal to 1 is the same as that described above and will not be repeated here. In addition, according to the temperature limiting measure of the charging branch, when the first output current I 1 output by the first charging branch 31 and the second output current I 2 output by the second charging branch 32 meet different needs, the adjustment manners of the voltage output by the first transmitting coil 121 as the transmitting end of the first charging branch 31 and the adjustment manners of the voltage output by the second transmitting coil 122 as the transmitting end of the second charging branch 32 are the same as those described above, and are not repeated here.
In summary, whether the first voltage conversion circuit 102 in the wireless charging transmitter 10 is a voltage boosting circuit or a voltage dropping circuit, the voltage gain of the charging branch without the first voltage conversion circuit 102 is made to be close to 1, for example, greater than or equal to 1, and the voltage gain of the other charging branch is made to be less than 1. Or when the voltage transmission gain of the charging branch of the first voltage conversion circuit 102 is not set to be less than or equal to 1, the voltage gain of the other charging branch is greater than 1. Therefore, the voltages output by the first receiving controller 201 and the second receiving controller 202 connected in parallel in the wireless charging receiver 20 are similar or the same, and the first output current I 1 output by the first charging branch 31 and the second output current I 2 output by the second charging branch 32 can be accurately controlled.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (15)
1. A wireless charging transmitter, wherein the wireless charging transmitter is configured to output an alternating magnetic field to a wireless charging receiver; the wireless charging transmitter includes:
The first voltage conversion circuit is electrically connected with the adapter and is used for converting direct current output by the adapter into direct current;
The first inverter circuit is electrically connected with the first voltage conversion circuit and is used for converting direct current output by the first voltage conversion circuit into a first square wave signal;
The first transmitting coil is electrically connected with the first inverter circuit and is used for converting the first square wave signal into a first alternating magnetic field; the circuit for receiving the first alternating magnetic field in the wireless charging receiver outputs a first output voltage V o1 to a battery in the wireless charging receiver, and the ratio of the first output voltage V in1 of the first inverter circuit is a first voltage transmission gain k1;
the second inverter circuit is electrically connected with the adapter and is used for converting direct current output by the adapter into a second square wave signal;
The second transmitting coil is electrically connected with the second inverter circuit and is used for converting the second square wave signal into a second alternating magnetic field; the circuit for receiving the second alternating magnetic field in the wireless charging receiver outputs a second output voltage V o2 to the battery, and the ratio of the second output voltage V in2 of the second inverter circuit is a second voltage transmission gain k2;
Wherein the first voltage transmission gain k1 is different from the second voltage transmission gain k2, k2 is more than or equal to 1, and k1 is less than 1; or k2 is less than or equal to 1, and k1 is more than 1;0 < |k1-k2| is less than or equal to 0.3; the first output voltage V o1 and the second output voltage V o2 are the same.
2. The wireless charging transmitter of claim 1, wherein the first voltage conversion circuit is a boost circuit, and the first voltage transmission gain k1 is less than the second voltage transmission gain k2.
3. The wireless charging transmitter of claim 2, wherein the wireless charging transmitter comprises a wireless transmitter,
The number of turns of a first receiving coil for receiving the first alternating magnetic field is smaller than that of the first transmitting coil in the wireless charging receiver;
in the wireless charging receiver, the number of turns of a second receiving coil for receiving the second alternating magnetic field is greater than or equal to the number of turns of the second transmitting coil.
4. The wireless charging transmitter of claim 1, wherein the first voltage conversion circuit is a buck circuit, the first voltage transmission gain k1 being greater than the second voltage transmission gain k2.
5. The wireless charging transmitter of claim 4, wherein the wireless charging transmitter comprises a wireless transmitter,
In the wireless charging receiver, the number of turns of a first receiving coil for receiving the first alternating magnetic field is larger than the number of turns of the first transmitting coil;
in the wireless charging receiver, the number of turns of a second receiving coil for receiving the second alternating magnetic field is smaller than or equal to the number of turns of the second transmitting coil.
6. The wireless charging transmitter of any of claims 1-5, wherein,
The wireless charging transmitter further comprises:
The first matching capacitor is connected in series with the first transmitting coil and forms a first series resonance network with the first transmitting coil;
The second matching capacitor is connected in series with the second transmitting coil and forms a second series resonance network with the second transmitting coil; wherein the operating frequency of the first series resonant network is different from the operating frequency of the second series resonant network.
7. The wireless charging transmitter of claim 6, wherein the wireless charging transmitter comprises a wireless transmitter,
The wireless charging transmitter further comprises a first magnetic bar;
When the working frequency of the first series resonance network is smaller than that of the second series resonance network, the first transmitting coil is a circular coil; the second transmitting coil is a magnetic rod coil wound on the first magnetic rod;
Or alternatively
When the working frequency of the first series resonance network is greater than that of the second series resonance network, the first transmitting coil is a magnetic rod coil wound on the first magnetic rod; the second transmitting coil is a circular coil.
8. The wireless charging transmitter of any of claims 1-5, wherein,
The wireless charging transmitter further comprises:
A first emission controller electrically connected with the first voltage conversion circuit and the first inverter circuit, the first emission controller being configured to input a first pulse width modulation PWM signal to the first voltage conversion circuit to control an output voltage of the first voltage conversion circuit, and to input a second PWM signal to the first inverter circuit to control a frequency of the first square wave signal;
And the second emission controller is electrically connected with the second inverter circuit and is used for inputting a third PWM signal to the second inverter circuit so as to control the frequency of the second square wave signal.
9. A wireless charging receiver, characterized by; comprising the following steps:
A battery;
The first receiving coil is used for receiving a first alternating magnetic field output by a first transmitting coil in the wireless charging transmitter and converting the first alternating magnetic field into alternating current;
The first receiving controller is electrically connected with the first receiving coil and the battery, and is used for converting alternating current generated by the first receiving coil into direct current and outputting the direct current to the battery; the first receiving controller outputs a first output voltage V o1 to the battery, and the ratio of the input voltage V in1 of a first inverter circuit electrically connected with the first transmitting coil in the wireless charging transmitter is a first voltage transmission gain k1;
The second receiving coil is used for receiving a second alternating magnetic field output by a second transmitting coil in the wireless charging transmitter and converting the second alternating magnetic field into alternating current;
The second receiving controller is electrically connected with the second receiving coil and the battery, and is used for converting alternating current generated by the second receiving coil into direct current and outputting the direct current to the battery; the second receiving controller outputs a second output voltage V o2 to the battery, and the ratio of the input voltage V in2 of a second inverter circuit electrically connected with the second transmitting coil in the wireless charging transmitter is a second voltage transmission gain k2;
Wherein the first voltage transmission gain k1 is different from the second voltage transmission gain k2, k2 is more than or equal to 1, and k1 is less than 1; or k2 is less than or equal to 1, and k1 is more than 1;0 < |k1-k2| is less than or equal to 0.3; the first output voltage V o1 and the second output voltage V o2 are the same.
10. The wireless charging receiver of claim 9, wherein the first voltage transmission gain k1 is less than the second voltage transmission gain k2;
The number of turns of the first receiving coil is smaller than the number of turns of the first transmitting coil;
the number of turns of the second receiving coil is greater than or equal to the number of turns of the second transmitting coil.
11. The wireless charging receiver of claim 9, wherein the first voltage transmission gain k1 is greater than the second voltage transmission gain k2;
The number of turns of the first receiving coil is larger than the number of turns of the first transmitting coil;
the number of turns of the second receiving coil is less than or equal to the number of turns of the second transmitting coil.
12. The wireless charging receiver of any of claims 9-11, wherein,
The wireless charging receiver further comprises a second magnetic bar;
The first receiving coil is a round coil, and the second receiving coil is a magnetic rod coil wound on the second magnetic rod; or the first receiving coil is a magnetic rod coil wound on the second magnetic rod, and the second receiving coil is a circular coil.
13. The wireless charging receiver of any of claims 9-11, wherein the wireless charging receiver further comprises:
a first thermistor for sensing a first temperature T 1 of the first receiving coil;
A second thermistor for sensing a second temperature T 2 of the second receiving coil;
And the charging manager is electrically connected with the first thermistor and the second thermistor and is used for generating a power request according to the first temperature T 1 and the second temperature T 2, and the power request is used for adjusting the charging power output by the wireless charging transmitter.
14. The wireless charging receiver of any of claims 9-11, wherein the wireless charging receiver further comprises:
a second voltage conversion circuit electrically connected to the battery, the first receiving controller, and the second receiving controller, for converting a voltage output from at least one of the first receiving controller and the second receiving controller into a charging voltage of the battery;
the first isolating switch is electrically connected with the first receiving controller and the second voltage conversion circuit; the first receiving controller is used for controlling the opening and the closing of the first isolating switch;
The second isolating switch is electrically connected with the second receiving controller and the second voltage conversion circuit; the second receiving controller is used for controlling the opening and the closing of the second isolating switch.
15. A wireless charging system comprising an adapter, a wireless charging transmitter according to any one of claims 1-8, and a wireless charging receiver according to any one of claims 9-14; the adapter is electrically connected with a first voltage conversion circuit and a second inverter circuit in the wireless charging transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2021/114137 WO2022042498A1 (en) | 2020-08-26 | 2021-08-23 | Wireless charging transmitter, wireless charging receiver, and wireless charging system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010873200 | 2020-08-26 | ||
| CN2020108732003 | 2020-08-26 |
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| CN114123537B true CN114123537B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110038596.4A Active CN114123537B (en) | 2020-08-26 | 2021-01-12 | Wireless charging transmitter, wireless charging receiver and wireless charging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114744725A (en) * | 2022-05-06 | 2022-07-12 | 长春捷翼汽车零部件有限公司 | Wireless charging device and vehicle with same |
| CN117937783A (en) * | 2024-03-25 | 2024-04-26 | 荣耀终端有限公司 | Wireless charging method and device |
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| CN202424250U (en) * | 2012-01-13 | 2012-09-05 | 富达通科技股份有限公司 | Groove-shaped induction type charger of electromechanical device |
| CN106558924A (en) * | 2016-11-10 | 2017-04-05 | 深圳市普林泰克科技有限公司 | A kind of wireless charger and wireless charging control method |
| CN208971205U (en) * | 2018-11-12 | 2019-06-11 | 南京和若源电气有限公司 | A kind of wireless charging device applied to explosion prevention robot |
| CN110518707A (en) * | 2019-08-14 | 2019-11-29 | 维沃移动通信有限公司 | Transmitting end equipment, receiving device and wireless charging method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202424250U (en) * | 2012-01-13 | 2012-09-05 | 富达通科技股份有限公司 | Groove-shaped induction type charger of electromechanical device |
| CN106558924A (en) * | 2016-11-10 | 2017-04-05 | 深圳市普林泰克科技有限公司 | A kind of wireless charger and wireless charging control method |
| CN208971205U (en) * | 2018-11-12 | 2019-06-11 | 南京和若源电气有限公司 | A kind of wireless charging device applied to explosion prevention robot |
| CN110518707A (en) * | 2019-08-14 | 2019-11-29 | 维沃移动通信有限公司 | Transmitting end equipment, receiving device and wireless charging method |
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| CN114123537A (en) | 2022-03-01 |
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