CN103457362B - The dispensing device of wireless charging, wireless charging system and wireless charging control method - Google Patents

Abstract

The present invention provides a wireless charging transmitting device, a wireless charging system and a charging control method thereof. The transmitting device includes: a transmitting coil for transmitting electric energy of the transmitting device; an oscillation and frequency modulation module for generating LC resonance in the transmitting coil; and Adjust the capacitance value in the LC resonance to change the resonant frequency of the LC resonance; the sampling module at the transmitting end collects the voltage and current of the sending device; the first control module controls and adjusts the resonance frequency of the LC resonance in the oscillation and frequency modulation module according to a predetermined frequency modulation method, and According to the collected voltage and current of the sending device and the voltage and current of the receiving device, the resonant frequency corresponding to the highest charging efficiency is stabilized and the energy sending process of charging is controlled; the first communication module is used for wireless communication of data between the sending device and the receiving device communications; and power modules. The sending device, the charging system and the charging control method can adjust the resonant frequency of the LC resonance, thus having the advantage of improving the charging efficiency of the charging system.

Description

Wireless charging transmission device, wireless charging system, and wireless charging control method

technical field

The present invention relates to the field of wireless charging, in particular to a wireless charging sending device, a wireless charging system, and a wireless charging control method thereof.

Background technique

At present, the application range of mobile terminals is more and more extensive, with powerful functions and excellent convenience, such as mobile phones, IPADs, and rechargeable 3D glasses, which are rich in entertainment, such as watching TV, surfing the Internet, singing, etc. . In the process of using a mobile terminal, due to the limitation of the battery capacity, the battery power will be used up soon. For example, the battery life of the mobile phone with the Android system, which is currently popular among users, is relatively poor. to recharge, so always bring a spare battery or wired charger with you. Many mobile terminals need to carry wired chargers to charge the battery, and wired chargers are cumbersome because of the cables. What's more, different mobile terminals often need specific chargers of different models to charge, so Many users, such as people on business trips, often need to bring chargers for mobile terminals such as mobile phones, computers, and razors. The various and complicated wired chargers bring great inconvenience to the use of consumers.

Therefore, the cumbersome wireless charger that allows consumers to reduce the shackles of wires and a large number of chargers has been favored by consumers, and it has a better market prospect. The wireless charger mainly uses the principle of electromagnetic induction, see Figure 1, which is a functional block diagram of a wireless charging system in the prior art, a sending coil is set in the wireless charging device to send out the energy of the power supply, and the mobile terminal to be charged A receiving coil is provided in the transmission coil, and a changing electromagnetic field is generated by applying a changing current in the sending coil, and the changing electromagnetic field is coupled to the receiving coil, so that a charging current is generated in the receiving coil, thereby realizing wireless charging of the mobile terminal.

However, the inventor of the present invention found in the process of researching and practicing the prior art that the charging state of the existing wireless charging transmitting device is affected by the wireless charging transmitting device itself and the outside world, so that its charging efficiency is low . For example, a sending device can be applied to various forms of receiving devices. When the relative position of the receiving device and the sending device changes, it will change the charging efficiency of the sending device and the receiving device, and the electric energy emitted by the sending device may change. It is reflected or partly lost in the form of coil heating. Therefore, there is a lot of energy waste in the current wireless charging system, and its charging efficiency is generally low.

It should be understood that the statements in this section merely provide background information related to the present invention and may or may not constitute so-called prior art.

Contents of the invention

The technical problem to be solved by the present invention is to provide a wireless charging transmitting device that can feed back the charging state and adjust the resonant frequency to improve the charging efficiency for the defect of low charging efficiency of the wireless charging system in the prior art.

The technical solution adopted by the present invention to solve the technical problem is to provide a wireless charging transmission device, which mainly includes:

The transmitting coil is used to transmit the electric energy of the transmitting device;

The oscillation and frequency modulation module is used to generate LC resonance in the transmitting coil, and adjust the capacitance value in the LC resonance to change the resonance frequency of the LC resonance;

The transmitter sampling module is used to collect the voltage and current of the sending device;

The first control module is used to control and adjust the resonance frequency of the LC resonance in the oscillation and frequency modulation module according to a predetermined frequency modulation method, and to stabilize the highest charging efficiency corresponding to the collected voltage and current of the sending device and the voltage and current of the receiving device. Resonant frequency and the energy delivery process that controls charging.

The first communication module is used for wireless communication of data between the sending device and the receiving device;

The power module is used to provide the required driving power for the sending device.

In the above wireless charging sending device, the first control module includes:

The conversion calculation module is used to perform analog-to-digital conversion on the collected data of the sending device and the receiving device, calculate the charging efficiency according to the data after the analog-to-digital conversion, and compare the highest charging efficiency among all charging efficiencies;

A storage module, configured to store the charging efficiency and the capacitance value corresponding to the charging efficiency;

The first single-chip microcomputer is used to control the resonant frequency in the above-mentioned oscillation and frequency modulation module according to the predetermined frequency modulation method and make the oscillation and frequency modulation module output the capacitance value corresponding to the highest charging efficiency stably, and control the energy transmission process of charging.

In the above-mentioned wireless charging sending device, the energy sending process of controlling the charging includes: controlling the supply of driving power required by each module, and controlling the start and stop of the energy sending.

In the above wireless charging transmitting device, the predetermined frequency modulation method refers to using the resonance frequency of 110KHZ as a reference within the range of 110KHZ-205KHZ, and increasing the resonance frequency at a rate of 1% to 1.5%.

In the above wireless charging sending device, the oscillation and frequency modulation module includes:

An adjustable capacitor module, configured to provide an adjustable capacitor and generate LC resonance with the transmitting coil;

The inverter module is used to convert the direct current output by the above-mentioned power supply module into alternating current for resonance between the adjustable capacitor module and the transmitting coil;

The second control module is configured to adjust the capacitance of the adjustable capacitance module and control the inversion of the inverter module according to the control signal output by the first control module.

In the above wireless charging sending device, the adjustable capacitance module is a capacitance matrix composed of a plurality of capacitances.

In the above wireless charging sending device, the second control module includes:

A switch matrix, used for correspondingly controlling whether the capacitors in the above-mentioned capacitor matrix are connected to the circuit;

A pulse width modulation module, configured to provide the pulse signal required by the inverter module to drive the inverter module according to the control signal output by the first control module;

The second single-chip microcomputer controls the operation of the pulse width modulation circuit and controls the on-off of each switch in the switch matrix according to the control signal output by the first control module.

In order to better solve the technical problem, the present invention also provides a wireless charging system, including a sending device and a receiving device, and the receiving device includes:

The receiving coil is used for electromagnetic induction coupling with the transmitting coil in the transmitting device;

The rectification and communication module is used to rectify the alternating current received by the receiving coil into direct current to charge the charging load and perform wireless communication with the sending device;

The receiving end sampling module is used to collect the voltage and current of the receiving device;

The sending device is the above-mentioned sending device.

In order to better solve the above technical problems, the present invention also provides a charging control method for a wireless charging system, which sequentially includes the following steps:

S1. Start the charging process with a reference frequency;

S2. Within the predetermined resonant frequency range, control the capacitance value in the LC resonance according to the predetermined frequency modulation method to adjust the resonance frequency of the LC resonance in the oscillation and frequency modulation module, and collect the voltage and current of the transmitting device under the capacitance value, and the receiving device. voltage and current;

S3. Obtain the highest charging efficiency and the optimal capacitance value corresponding to the highest charging efficiency according to the above collected data processing;

S4. Controlling the oscillation and frequency modulation module to stably output the above optimal capacitance value, so as to stabilize the LC resonance frequency.

The wireless charging transmitting device provided by the present invention controls the capacitance value in the oscillation and frequency modulation module through the first control module to change the LC resonance frequency, and dynamically collects the voltage and current of the transmitting device through the transmitting terminal sampling module, and according to the wireless transmission The charging efficiency is obtained from the voltage and current of the receiving device, and then the highest charging efficiency within the predetermined resonant frequency range and its optimal capacitance value are obtained through the first control module, so that the oscillation and frequency modulation module can work stably at the highest charging efficiency In the state of high efficiency, the charging efficiency of the wireless charging system can be greatly improved.

Description of drawings

Fig. 1 is a functional block diagram of a wireless charging system provided by the prior art;

Fig. 2 is a functional block diagram of the transmitting device of the wireless charging system provided by the present invention;

Fig. 3 is a functional block diagram of a wireless charging system provided by an embodiment of the present invention;

Fig. 4 is a structural block diagram of a transmitting device of a wireless charging system provided by a preferred embodiment of the present invention;

Fig. 5 is a structural block diagram of a receiving device of a wireless charging system provided by a preferred embodiment of the present invention;

Fig. 6 is a structural block diagram of the first control module and its periphery of the wireless charging system provided by a preferred embodiment of the present invention;

Fig. 7 is a functional block diagram of the oscillation and frequency modulation module in the wireless charging system provided by the embodiment of the present invention;

Fig. 8 is a schematic structural diagram of the oscillation and frequency modulation module in the wireless charging system provided by the embodiment of the present invention;

Fig. 9 is a flow chart of the charging control method of the wireless charging system provided by the present invention.

detailed description

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The wireless charging transmitting device provided by the present invention mainly uses the first control module combined with the control of the oscillation and frequency modulation module to change the LC resonance frequency so that the energy emitted by the transmitting device can be better utilized, thereby improving the charging efficiency.

Referring to Fig. 2 to Fig. 8, the wireless charging transmitting device provided by the present invention includes: a transmitting coil 6 for transmitting the power of the transmitting device, for adjusting the resonant frequency of LC resonance and causing the transmitting coil 6 to generate LC resonance oscillation and a frequency modulation module 5, a transmitter sampling module 2 for collecting the voltage and current of the transmitting device, a first communication module 4 for wireless communication of data between the transmitting device and the receiving device, and a first communication module 4 for providing all modules in the transmitting device The power supply module 1 of the required driving power also includes a first control module 3 for controlling the entire sending device. The first control module 3 is connected between the sampling module 2 of the transmitting end and the oscillation and frequency modulation module 5, which is used to control and adjust the resonance frequency of the LC resonance in the oscillation and frequency modulation module 5 according to a predetermined frequency modulation mode, and collect according to the sampling module 2 of the transmitting end. The voltage and current of the transmitting device and the receiving device are used to stabilize the resonance state of the oscillation and frequency modulation module 5, so that the oscillation and frequency modulation module 5 changes the LC resonance frequency to the best state, and the electric energy resonated from the LC can pass through the transmitting coil 6 most effectively. transmitted to the receiving device. Specifically, the first control module 3 changes the resonant frequency of the LC resonance according to a predetermined frequency modulation method, and collects the working status information of the sending device and the receiving device, and the first control module 3 obtains the According to the collected information of the receiving device, the input power of the receiving device is obtained, and then the charging efficiency is obtained. Among them, the resonant frequency corresponding to the highest charging efficiency is the optimal resonant frequency. The first control module 3-way oscillation and frequency modulation The module 5 sends control information, so that the resonance frequency in the oscillation and frequency modulation module 5 is adjusted to be the same as the above-mentioned optimum resonance frequency. Therefore, stabilizing the oscillation and frequency modulation module 5 at the optimum resonant frequency enables the electric energy transmitted by the transmitting device to be received by the receiving device most effectively, thereby maintaining the wireless charging system at the highest charging efficiency state.

In a specific implementation, referring to FIG. 7 , the oscillation and frequency modulation module 5 may include: an adjustable capacitor module 20 , an inverter module 22 and a second control module 21 . The capacitance of the adjustable capacitance module 20 can be adjusted. When the capacitance is adjusted to the required capacitance value, the LC resonance frequency formed by the capacitance and the transmitting coil 6 can make the transmitting device work at the optimal resonance frequency, so that the energy after the LC resonance can be It is emitted more effectively by the transmitting coil 6. The inverter module 22 is used to convert the direct current output by the power supply module 1 into an alternating current for the adjustable capacitor module 20 and the transmitting coil 6 to resonate. The second control module 21 is controlled by the instruction of the first control module 3 to adjust the capacitance value of the adjustable capacitance module 20 and the inversion process of the inverter module 22 .

Preferably, the adjustable capacitor module 20 is a capacitor matrix composed of multiple capacitors; the second control module includes: a switch matrix, a pulse width modulation module and a second single-chip microcomputer. The switches in the switch matrix are in one-to-one correspondence with the capacitors in the capacitor matrix, so as to control whether each capacitor in the capacitor matrix is connected to the circuit, that is, it determines the final value of the adjustable capacitor module 20 by controlling which capacitors are connected to the circuit. Capacitance value; the pulse width modulation module is used to provide the pulse signal required by the inverter module 22 to drive the inverter module 22 . The second single-chip microcomputer controls the work of the pulse width modulation module according to the control signal output by the first control module 3, and controls which switches in the switch matrix are closed or opened, which is mainly realized through program control. The pulse width modulation module and the inverter module 22 are technologies well known to those skilled in the art, and will not be repeated here.

The first control module 3 includes a conversion calculation module, a storage module and a first single-chip microcomputer. Among them, the conversion calculation module performs analog-to-digital conversion on the data collected by the sending device and the receiving device, and calculates the output power of the sending device, the input power of the receiving device, and the charging efficiency of the charging system (that is, the input power and the ratio of the output power), and compare and calculate the highest charging efficiency among the charging efficiencies. The storage module at least records the calculated charging efficiency and the capacitance value in the LC resonance corresponding to the charging efficiency. The first single-chip microcomputer adjusts and changes the resonance frequency of the LC resonance in the oscillation and frequency modulation module 5, and when the capacitance value corresponding to the highest charging efficiency is obtained, controls the oscillation and frequency modulation module 5 to stably output the capacitance value to stabilize the resonance frequency. At the same time, the first single-chip microcomputer also controls the entire charging energy sending process. For example, control and provide the drive power required by each module, and control the start and stop of energy transmission. It can control the power conversion of the power module 1 and the power conversion of the inverter module 22 . Preferably, the first single-chip computer can also be connected to the LCD display module and the host computer to better monitor and control the charging process.

It is worth noting that since the alternating current output by the inverter module 22 is directly used to make the transmitting coil 6 and the capacitor in the adjustable capacitor module 20 undergo LC resonance, only when the resonant frequency is closest to the frequency output by the inverter module 22 (i.e., transmit The transmission frequency of the coil 6 (or the charging frequency) can ensure the maximum charging efficiency in the case of the sending device and the receiving device in the same state. For example, in actual implementation, the wireless charging standard stipulates that the charging frequency must be 110-205KHZ. Therefore, the present invention collects the charging efficiency at the resonant frequency while adjusting the frequency (that is, adjusting the resonance frequency). The present invention makes the oscillation and frequency modulation module 5 The resonant frequency is changed within the range of 110-205KHZ to find out when the resonant frequency can ensure the highest charging efficiency. Preferably, when changing the resonant frequency of the oscillation and frequency modulation module 5 , the resonant frequency of the oscillation and frequency modulation module 5 is set to 110KHZ based on the resonant frequency of 110KHZ, and the charging efficiency in this state is recorded. Then, increase the resonant frequency from 110KHZ to 205KHZ in the range of 1% to 1.5%. More preferably, it increases to 205KHZ at a rate of 1%, so as to find out the optimal resonance frequency (ie, the resonance frequency at the highest charging efficiency) more quickly and accurately.

The present invention also provides a wireless charging system, as shown in FIG. 3 , which includes the above-mentioned sending device, and also includes a receiving device, the receiving device includes: a receiving coil 9 for electromagnetic induction coupling with the transmitting coil 6 in the sending device; The rectification and communication module 8 is used to rectify the alternating current received by the receiving coil 9 into a direct current to charge the charging load 7 and perform wireless communication with the sending device; the receiving end sampling module 10 is used to collect the voltage of the receiving device and current. It is worth noting that the sampling module 10 at the receiving end can be installed at the receiving coil 9 or at the charging load 7. Similarly, the sampling module 2 at the transmitting end can be installed at the transmitting coil 6 or at the power supply module 1 place. Since the power output by the power supply module 1 needs to undergo a series of processing, there will be some losses, and the electric energy received by the receiving coil 9 will also be affected by some losses before being provided to the charging load 7 for charging. Therefore, the transmitter sampling module 2 and the receiver The sampling module 10 is respectively installed at the power module 1 and the charging load 7 so as to better obtain the charging efficiency of the charging system. The above-mentioned power supply module 1 supplies power to each module, such as providing the required DC drive voltage to the first single-chip microcomputer, the second single-chip microcomputer, and the transmitter sampling module 2. The drive voltage required by each module is different, and the power supply module 1 includes a pair of 220V The conversion module for converting commercial power or other power sources is well known to those skilled in the art and will not be repeated here.

Preferably, the wireless charging system also provides a device for protecting the charging process. For example: the charging system further includes a temperature acquisition module arranged on the sending device and/or the receiving device, and a first switch for stopping charging when the temperature is overheated. The temperature acquisition module can be a common component such as a temperature sensor. The first switch is in a normally closed state, and the first controller compares the collected temperature with the predetermined safe temperature in the single-chip microcomputer. When the collected temperature exceeds the predetermined safe temperature, the first control module 3 outputs a control signal to turn the first switch disconnect, so that the oscillation and frequency modulation module 5 is disconnected from the transmitting coil 6 . The wireless charging system may also include a second switch arranged between the rectification and communication module 8 and the receiving coil 9, the principle is the same as above, when the collected voltage or current of the receiving device exceeds a predetermined safety value (that is, overcharge), The first control module 3 outputs a control signal to turn off the second switch. The first switch and the second switch only need to stop charging for charging protection. It can be understood that the installation positions thereof are not limited to the above technical solution. Preferably, electrical isolation modules for safety isolation are provided between the first control module 3 and the first switch, the second switch, the sampling module 2 at the transmitting end, and the sampling module 10 at the receiving end, so as to protect the charging process. The above-mentioned first switch, second switch, and electrical isolation module are commonly used components or devices in the field, which are well known to those skilled in the art, and will not be repeated here.

The present invention also provides a charging control method for a wireless charging system, which mainly includes the following steps in sequence:

S1, start the charging process;

S2. Frequency modulation and sampling: within the predetermined resonance frequency range, control the capacitance value in the LC resonance according to the predetermined frequency modulation method to adjust the resonance frequency of the LC resonance in the oscillation and frequency modulation module 5, and collect the voltage and current of the transmitting device under the capacitance value , and the voltage and current of the receiving device;

At present, within the predetermined resonant frequency range, it mainly refers to the frequency range from 110KHZ to 205KHZ as a frequency modulation and sampling cycle according to the charging frequency in the wireless charging standard, that is, to adjust the resonant frequency to change the resonant frequency in a certain proportion until 110KHZ to 205KHZ have been regulated output.

S3. Obtain the optimal capacitance value: obtain the highest charging efficiency and the optimal capacitance value corresponding to the highest charging efficiency according to the above-mentioned collected data;

S4. Stabilizing the LC resonant frequency: controlling the oscillation and frequency modulation module 5 to stably output the above optimal capacitance value, so as to stabilize the LC resonant frequency.

Referring to the embodiment shown in FIG. 9 to illustrate the charging control method provided by the present invention. In this embodiment, the predetermined frequency modulation method may be based on the resonant frequency of 110KHZ within the interval of 110KHZ-205KHZ, and the resonant frequency is increased in the range of 1% to 1.5%. Its specific charging control process is as follows: first, by changing the capacitance value of the LC resonance in the oscillation and frequency modulation module 5, start charging when its resonance frequency is 110KHZ (the 110KHZ is the reference frequency, which is set in the first control module 3 program setting); then, collect the voltage and current of the sending device, and the voltage and current of the receiving device at this time, and control and adjust the capacitance value in the oscillation and frequency modulation module 5, so that the frequency of LC resonance is 115KHZ and record the transmission at this frequency The voltage and current of the device, and the voltage and current of the receiving device, then adjust the resonant frequency to 120KHZ and 125KHZ again, change the resonant frequency according to the incremental speed and record the charging status at that time, until the resonant frequency is adjusted to 205KHZ, which is a frequency modulation and sampling cycle ; Then, according to the collected voltage and current, the highest charging efficiency and the optimal capacitance value corresponding to the highest charging efficiency are obtained, and finally the capacitance value under the highest charging efficiency is fixed, so as to stabilize the charging system in the working state of the highest charging efficiency Down.

Since the inductance value of the transmitting coil 6 will change with the environment, for example, when the receiving device is placed at a relatively long distance, the direct coupling between the receiving coil 9 and the transmitting coil 6 will cause fine adjustment of the L value. Therefore, preferably, the frequency modulation is to change the capacitance value in the LC resonance by adjusting the capacitance matrix, and then change the resonant frequency of the LC resonance, so as to more accurately adjust to the optimal charging state.

In a specific implementation, step S2 may also include collecting the temperature of the sending device and/or the receiving device, and judging in step S3 whether the temperature is too high, and if so, stopping charging. For example, when the temperature acquired by the first controller exceeds a predetermined temperature, it sends an instruction to turn off the first switch. Preferably, step S3 may also include judging whether the battery is overcharged according to the above-mentioned collected data, and stopping charging if it is overcharged. For example, when the collected voltage or current of the receiving device exceeds a predetermined safety value, the first control module 3 outputs an instruction to turn off the second switch to stop charging.

Combining again with the embodiments shown in Fig. 2 to Fig. 8, the working principle of the sending device and the charging system provided by the present invention are described in detail as follows:

As shown in Figure 4, the transmitter sampling module includes: a current monitoring circuit, which is composed of a current detection resistor R1 and a differential amplifier circuit; a voltage monitoring circuit, mainly composed of a voltage divider resistor R2, R3 to form a voltage divider network; the output of the differential amplifier circuit The terminal A1 is connected to the AD input terminal A1 port of the first single-chip microcomputer through the electrical isolation module, and the voltage collected by the voltage monitoring circuit is connected to the AD input terminal A2 of the first single-chip microcomputer through the electrical isolation module. In this way, the voltage dividing network and the control network can be prevented from interfering with each other, so as to obtain a stable voltage and current value, and the output power of the transmitting device can be obtained according to the voltage and current value. Similarly, the receiving end detects the current at the receiving end through the current monitoring resistor R4 and the amplifier, and the output terminal A3 of the differential amplifier circuit is connected to the AD input terminal A3 port of the first single-chip microcomputer through the electrical isolation module; the voltage dividing resistors R5 and R6 form a voltage dividing network , the divided voltage is connected to the AD input terminal A4 of the first single-chip microcomputer through the electrical isolation module, and the input power of the receiving terminal is obtained according to the detected voltage and current of the receiving terminal. According to the change of input power and output power, the charging change process of the wireless charging network can be monitored.

The charging control strategy of the transmitting end is illustrated through specific examples as follows: the resonant frequency is adjusted from the frequency range of 110kHz to 205kHz, and in the frequency range of 110kHz to 175kHz, the resonant frequency is increased by 1% on the basis of 110KHZ, and the resonant frequency is adjusted at 175kHz to 205kHz In the frequency range, the resonant frequency is increased by 2%. Until a frequency modulation and sampling cycle is completed (that is, the resonance frequency increases from 110KHZ to 205KHZ is a frequency modulation and sampling cycle), find out the capacitance value at the highest charging efficiency, and control the stable output of the capacitance value to stabilize the resonance frequency.

To sum up, the wireless charging sending device and the wireless charging system provided by the present invention can adjust different charging conditions, monitor and intelligently adjust the wireless charging strategy in real time, so that the wireless charging system can perform charging at the highest charging efficiency under the system. Charge. It adopts an intelligent closed-loop feedback method to optimize the charging efficiency, which can greatly improve the charging efficiency of the entire system. In addition, it adopts over-temperature and over-charge protection to ensure the charging safety of the entire charging system.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two The internal communication of each element may be directly connected or indirectly connected through an intermediary. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (15)

1. a dispensing device for wireless charging, is characterized in that, comprising:

Transmitting coil, for launching the electric energy of dispensing device;

Vibration and FM module, for driving transmitting coil to produce LC resonance, and regulate the humorous center of percussion capacitance of LC to change the resonance frequency of LC resonance;

Transmitting terminal sampling module, for gathering voltage and the electric current of described dispensing device;

First control module, for the resonance frequency of LC resonance in vibration according to predetermined mode of frequency regulation regulating and controlling and FM module, and according to resonance frequency corresponding to the most high recharge efficiency of the voltage of the voltage of the dispensing device collected, electric current and receiving system and current stabilization and the energy process of transmitting controlling charging;

First communication module, for the radio communication of data between dispensing device and receiving system; And

Power module, provides required driving power for giving described dispensing device;

Described first control module comprises: translation operation module, analog-to-digital conversion is carried out for the voltage of the dispensing device that will collect and receiving system and current data, and calculate charge efficiency according to the data after analog-to-digital conversion, and compare the most high recharge efficiency in all charge efficiencies; Memory module, for storing above-mentioned charge efficiency and capacitance corresponding to this charge efficiency; And first single-chip microcomputer, for controlling the resonance frequency in above-mentioned vibration and FM module according to predetermined mode of frequency regulation and the capacitance making vibration and FM module stablize to export most high recharge efficiency corresponding, and control the energy process of transmitting of charging.

2. the dispensing device of wireless charging as claimed in claim 1, is characterized in that, the described energy process of transmitting controlling charging comprises: control the driving power provided needed for each module, and the start and stop that control energy sends.

3. the dispensing device of wireless charging as claimed in claim 1 or 2, it is characterized in that, described predetermined mode of frequency regulation is: in the interval of 110KHZ-205KHZ with the resonance frequency of 110KHZ for benchmark, and increase progressively resonance frequency with the speedup of 1% to 1.5%.

4. the dispensing device of wireless charging as claimed in claim 1, it is characterized in that, described vibration and FM module comprise:

Tunable capacitor module, for providing adjustable electric capacity and producing LC resonance with described transmitting coil;

Inversion module, the direct current for exporting above-mentioned power module is converted to the alternating current carrying out resonance for tunable capacitor module and transmitting coil;

Second control module, the control signal for exporting according to described first control module regulates the electric capacity of described tunable capacitor module and controls the inversion of inversion module.

5. the dispensing device of wireless charging as claimed in claim 4, is characterized in that, described tunable capacitor module is the capacitance matrix of multiple electric capacity composition.

6. the dispensing device of wireless charging as claimed in claim 5, it is characterized in that, described second control module comprises:

Switch matrix, for controlling in above-mentioned capacitance matrix electric capacity whether access circuit accordingly;

Pulse width modulation module, provides the pulse signal needed for inversion module to drive inversion module for the control signal exported according to the first control module;

Second singlechip, the control signal exported according to the first control module controls the break-make of each switch in the work of pulse-width modulation circuit and control switch matrix.

7. a wireless charging system, comprises dispensing device and receiving system, and described receiving system comprises:

Receiving coil, is coupled for carrying out electromagnetic induction with transmitting coil in dispensing device;

Rectification and communication module, the AC rectification for being received by receiving coil is to charging load charging after direct current, and carries out radio communication with dispensing device;

Receiving terminal sampling module, for gathering voltage and the electric current of described receiving system;

It is characterized in that, the dispensing device of described dispensing device according to any one of the claims 1-6.

8. wireless charging system as claimed in claim 7, is characterized in that, also comprise:

Be arranged at the temperature collect module on described dispensing device and/or receiving system; And

When the temperature collected exceedes predetermined safety temperature according to the first switch that vibration and FM module and transmitting coil disconnect by the control signal of the first control module.

9. wireless charging system as claimed in claim 8, it is characterized in that, described rectification and be provided with second switch between communication module and receiving coil, disconnects rectification and communication module and receiving coil according to the control signal of the first control module during for exceeding predetermined safety value when the voltage or electric current that collect receiving system.

10. wireless charging system as claimed in claim 9, is characterized in that, described first control module and the electrical isolation module be provided with between described first switch, second switch, transmitting terminal sampling module and receiving terminal sampling module for Secure isolation.

The charge control method of 11. 1 kinds of wireless charging systems, is characterized in that, comprises the following steps successively:

S1, with one reference frequency start charging process;

S2, in predetermined resonant frequency range, according to the humorous center of percussion capacitance of predetermined mode of frequency regulation control LC to regulate the resonance frequency of LC resonance in vibration and FM module and the voltage of the voltage of dispensing device, electric current and receiving system and electric current under gathering this capacitance;

S3, to draw most high recharge efficiency and optimum capacitance value corresponding to most high recharge efficiency according to the above-mentioned voltage that collects and current data process;

S4, control make vibration and the above-mentioned optimum capacitance value of the stable output of FM module, with stable LC resonance frequency.

12. charge control methods as claimed in claim 11, is characterized in that, described frequency modulation changes the humorous center of percussion capacitance of LC, to regulate the resonance frequency of LC resonance by control capacittance matrix.

13. charge control methods as claimed in claim 11, is characterized in that, described step S2 also comprises the temperature gathering dispensing device and/or receiving system, and judges whether excess temperature in step s3, if excess temperature, then stop charging.

14. charge control methods as claimed in claim 11, is characterized in that, described step S3 also comprises and judges whether to overcharge according to the voltage of the above-mentioned receiving system collected and electric current, if overcharged, then stops charging.

15. charge control methods according to any one of claim 12 to 14, it is characterized in that, described predetermined mode of frequency regulation is: in the interval of 110KHZ-205KHZ with the resonance frequency of 110KHZ for benchmark, and increase progressively resonance frequency with the speedup of 1% to 1.5%.