CN108879896B - Wireless charging Bluetooth sound box and wireless charger - Google Patents
Wireless charging Bluetooth sound box and wireless charger Download PDFInfo
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
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Abstract
The invention designs a wireless charging Bluetooth sound box and a wireless charger, wherein the Bluetooth sound box is arranged at the top of the wireless charger when being charged wirelessly; the wireless charger is used for charging the Bluetooth sound box, and comprises: the wireless charging control system comprises a wireless charging transmitting module, a first rectifying module, a voltage regulating module, an inverting module, a first Bluetooth module and a wireless charging control module; the Bluetooth sound box comprises a wireless charging receiving module, a second rectifying module, a second Bluetooth module and a sound box control module; the first Bluetooth module and the second Bluetooth module realize mutual communication through Bluetooth connection in a wireless charging process, so that the charging intelligence is realized; and the specific circuit constitution of the wireless charging transmitting module of the wireless charger and the related control strategy of the control module are designed, so that the charging power for wireless charging between the wireless charger and the Bluetooth sound box is adjustable, the charging efficiency is high, and the energy loss of the whole charging system is small.
Description
Technical Field
The invention relates to the technical field of wireless chargers, in particular to a wireless charging Bluetooth sound box and a wireless charger.
Background
With the appearance of smart phones and tablet computers, people use smart electronic products more and more frequently, and charging the smart electronic products becomes an indispensable thing in daily life. More convenient has been brought for people's life to the appearance of wireless charger, but wireless charger function singleness usually, and when being electronic equipment, such as bluetooth speaker charges, can't communicate with bluetooth speaker to this optimizes the charging strategy better, optimizes the charging control of wireless charger to bluetooth speaker, thereby improves its charge efficiency, and reduces the energy consumption.
Disclosure of Invention
In view of the above problems, the present invention provides a wireless charging bluetooth speaker and a wireless charger.
The purpose of the invention is realized by adopting the following technical scheme:
the utility model provides a wireless charging Bluetooth sound box and a wireless charger; the Bluetooth sound box is arranged on the top of the wireless charger when being wirelessly charged;
the wireless charger is used for charging the Bluetooth sound box, and comprises: the wireless charging control system comprises a wireless charging transmitting module, a first rectifying module, a voltage regulating module, an inverting module, a first Bluetooth module and a wireless charging control module;
the Bluetooth sound box comprises a wireless charging receiving module, a second rectifying module, a second Bluetooth module and a sound box control module;
the wireless charging receiving module receives the coupling magnetic field energy and converts the coupling magnetic field energy into alternating current energy, and then the alternating current energy is rectified into direct current through the second rectifying module to charge the built-in battery of the Bluetooth sound box;
the first Bluetooth module and the second Bluetooth module realize mutual communication through Bluetooth connection in a wireless charging process, and the first Bluetooth module is connected with a communication end of the wireless charging control module; and the second Bluetooth module is connected with the communication end of the sound box control module.
Preferably, wireless charger is still including the magnetism isolating module that is located wireless charger middle part, wireless transmitting module, first rectifier module, voltage regulating module and the contravariant module of charging are located the upper portion of magnetism isolating module, first bluetooth module and wireless charging control module are located the lower part of magnetism isolating module, are used for keeping apart the interference of the high frequency magnetic field in the magnetism isolating module upper portion space to wireless charging control module and first bluetooth module.
Preferably, the first bluetooth module comprises: the Bluetooth radio frequency antenna, the Bluetooth radio frequency control unit, the Bluetooth power amplifier unit and the Bluetooth loudspeaker are arranged on the Bluetooth radio frequency antenna; the Bluetooth power amplification unit is used for amplifying the power of the signal received by the first Bluetooth module, and then performing electroacoustic conversion on the signal through a Bluetooth loudspeaker to broadcast the working state of the wireless charger; the Bluetooth radio frequency control unit is used for controlling the strength of the transmitted signal intensity of the Bluetooth radio frequency antenna.
Preferably, the top of the wireless charger is provided with a limiting module which limits the position of the bluetooth sound box, so that the wireless charging receiving module of the bluetooth sound box and the wireless charging transmitting module are enabled to be free of deviation and complete in coupling.
Preferably, the wireless charging and transmitting module comprises a first reactive compensation module and a transmitting resonance module, alternating current at the output end of the inverter is compensated by the first reactive compensation module, and then electric energy is converted into an electromagnetic field by the transmitting resonance module; the wireless charging receiving module comprises a receiving resonance module and a second reactive compensation module, the receiving resonance module receives electromagnetic field energy transmitted by the transmitting resonance module, and the electromagnetic field energy is converted into electric energy and then compensated by the second reactive compensation module.
Preferably, the wireless charging control module is further configured to obtain a maximum acceptable power of the speaker, where the maximum acceptable power is determined by an existing capacity of a battery of the speaker and is sent to the first bluetooth module through a second bluetooth module of the speaker; the wireless charging control module comprises a voltage regulating unit, the voltage regulating unit firstly calculates the maximum transmissible power of the wireless charger under the condition that the voltage regulating module is not accessed, the maximum acceptable power of the battery at the side of the sound box is compared with the maximum transmissible power of the wireless charger, and if the maximum transmissible power meets the maximum acceptable power of the battery of the Bluetooth sound box, the wireless charging control module controls the voltage regulating module to be out of work; if not, the voltage regulating module is controlled to work to regulate the input voltage of the inverter.
Preferably, the maximum transmittable power which can be transmitted by the wireless charger when the voltage regulating module is not connected to the wireless charger is calculated by the following formula:
in the formula, pmaxFor the maximum transmission power that can be transmitted, w0A charging resonance frequency set for a transmitting resonance module of the wireless charger; l is1Resonating in modules for transmissionA vibration inductance value; l is2Receiving the inductance value of the resonance inductor in the resonance module; l isb1The inductance value of the compensation inductor in the first reactive compensation module; l isb2The inductance value of the compensation inductor in the second reactive compensation module; g is a mutual inductance influence factor obtained by testing between the resonance inductor and the corresponding compensation inductor; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; vIQmThe maximum input voltage of the input end of the first reactive compensation module is the maximum input voltage when the voltage regulation is not carried out by the voltage regulation module; vqoutAnd charging voltage for the request of the wireless charging Bluetooth loudspeaker box.
The invention has the beneficial effects that: the invention designs a wireless charging Bluetooth sound box and a wireless charger, wherein a built-in Bluetooth module of the wireless charger can be in communication connection with the Bluetooth sound box, so that the charging intelligence is realized; and the specific circuit constitution of the wireless charging transmitting module of the wireless charger and the related control strategy of the control module are designed, so that the charging power for wireless charging between the wireless charger and the Bluetooth sound box is adjustable, the charging efficiency is high, the energy loss of the whole charging system is small, and the wireless charging system has a certain application prospect.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a frame structure diagram of a charging system composed of a bluetooth speaker and a wireless charger according to a preferred embodiment of the present invention;
fig. 2 is a functional block diagram of a charging system composed of a bluetooth speaker and a wireless charger according to a preferred embodiment of the present invention;
FIG. 3 is a communication flow diagram of the interaction between a first Bluetooth module and a second Bluetooth module in a preferred embodiment of the present invention;
fig. 4 is a circuit structure diagram of a wireless charging transmitting module and a wireless charging receiving module in a preferred embodiment of the invention.
Detailed Description
The invention is further described in connection with the following application scenarios.
The description relating to "first", "second", etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and 2, a wireless charging bluetooth speaker and a wireless charger are provided; the Bluetooth sound box is arranged on the top of the wireless charger when being wirelessly charged;
the wireless charger is used for charging the Bluetooth sound box, and comprises: the wireless charging control system comprises a wireless charging transmitting module, a first rectifying module, a voltage regulating module, an inverting module, a first Bluetooth module and a wireless charging control module;
the Bluetooth sound box comprises a wireless charging receiving module, a second rectifying module, a second Bluetooth module and a sound box control module;
the wireless charging receiving module receives the coupling magnetic field energy and converts the coupling magnetic field energy into alternating current energy, and then the alternating current energy is rectified into direct current through the second rectifying module to charge the built-in battery of the Bluetooth sound box;
the first Bluetooth module and the second Bluetooth module realize mutual communication through Bluetooth connection in a wireless charging process, and the first Bluetooth module is connected with a communication end of the wireless charging control module; and the second Bluetooth module is connected with the communication end of the sound box control module.
In this embodiment, wireless charger is still including being located the magnetism isolating module in wireless charger middle part, wireless transmitting module, first rectifier module, voltage regulating module and the contravariant module of charging are located the upper portion of magnetism isolating module, first bluetooth module and wireless charging control module are located the lower part of magnetism isolating module, are used for keeping apart the interference of high frequency magnetic field in the magnetism isolating module upper portion space to wireless charging control module and first bluetooth module.
In this embodiment, the first bluetooth module includes: the Bluetooth radio frequency antenna, the Bluetooth radio frequency control unit, the Bluetooth power amplifier unit and the Bluetooth loudspeaker are arranged on the Bluetooth radio frequency antenna; the Bluetooth power amplification unit is used for amplifying the power of the signal received by the first Bluetooth module, and then performing electroacoustic conversion on the signal through a Bluetooth loudspeaker to broadcast the working state of the wireless charger; the Bluetooth radio frequency control unit is used for controlling the strength of the signal transmitted by the Bluetooth radio frequency antenna; when the wireless charger is about to finish charging, the wireless charging control module sends a signal to the Bluetooth power amplification unit, and a Bluetooth loudspeaker sends a sound signal of 'charging finished'; when the wireless charger transmits a charging fault, the Bluetooth loudspeaker is triggered to alarm and send out a charging fault sound signal.
In this embodiment, the top of the wireless charger is provided with a limiting module, which limits the position of the bluetooth speaker, and is used for ensuring that the wireless charging receiving module of the bluetooth speaker does not deviate from the wireless charging transmitting module, and the coupling is complete.
In this embodiment, referring to fig. 3, the process of the first bluetooth module and the second bluetooth module performing interactive communication in the wireless charging process is as follows: after the Bluetooth sound box is placed at the top of the wireless charger and fixed by the limiting device, a second Bluetooth module of the Bluetooth sound box is paired with a first Bluetooth module, and charging request information is sent to the first Bluetooth module, the first Bluetooth module sends the charging request information to the wireless charging control module, the wireless charging control module detects historical charging information of the wireless charger, judges whether the wireless charger has a fault, and triggers the first Bluetooth module to send charging permission or charging fault information to the second Bluetooth module after judgment; when receiving the charging permission information, the second module sends charging preparation information to the first Bluetooth module; at the moment, after receiving the information of 'preparation for charging', the first Bluetooth module sends the information to the wireless charging control module, the wireless charging control module controls the wireless charging transmitting module to work, energy transmission is carried out, and meanwhile, the first Bluetooth module is triggered to send 'start charging' information to the second Bluetooth module; after the first Bluetooth module receives the charging start information, the Bluetooth sound box samples charging data and sends the charging data to the first Bluetooth module; the first Bluetooth module controls a charging system consisting of the wireless charger and the Bluetooth loudspeaker box according to charging data until charging is completed or charging fails, and sends charging end or charging failure information to the second Bluetooth module.
In this embodiment, the two ends of the voltage regulating module are connected in parallel with a bypass switch module, and the bypass switch module is used for reducing the input voltage of the inverter in the shortest time, so as to rapidly reduce the output power of the wireless charger, and greatly reduce the time required for turning off the wireless charger. For example, when the bluetooth sound box is suddenly pulled away, the wireless charging control module immediately receives an alarm signal generated by charging data abnormity and generates an action signal for controlling the bypass switch module, so that the switch module works to bypass the voltage regulating module; or when bluetooth speaker's electric quantity was full of, wireless charging control module produced the action signal of control bypass switch module when being full of according to the charged state of charging data and control speaker for the switch module work carries out the bypass with the pressure regulating module.
In this embodiment, the wireless charging transmission module includes a first reactive compensation module and a transmission resonance module, and the ac at the output end of the inverter is compensated by the first reactive compensation module and then converted into an electromagnetic field by the transmission resonance module; the wireless charging receiving module comprises a receiving resonance module and a second reactive compensation module, the receiving resonance module receives electromagnetic field energy transmitted by the transmitting resonance module, and the electromagnetic field energy is converted into electric energy and then compensated by the second reactive compensation module.
In this embodiment, the wireless charging control module is respectively connected to the controlled end of the first driving module and the controlled end of the second driving module; the first driving module drives the voltage regulating module to regulate the input voltage of the inverter; the second driving module is used for generating a trigger signal to drive the inverter to work; and the control end of the sound box control module is respectively connected with the controlled end of the open-circuit protection relay and the controlled end of the second rectifying module.
In this embodiment, the voltage regulation module is a Boost converter having a four-term interleaved PFC circuit topology.
Referring to fig. 4, in the present embodiment, the LCC type reactive compensation circuit in the first reactive compensation module specifically includes: the first output end of the inverter is connected with a compensation inductor Lb1An input terminal of (1); compensation capacitor Cb1One end is connected with a compensation inductor Lb1The other end of the output end of the inverter is connected with a second output end of the inverter; a first capacitor C1Is connected to the compensation inductance Lb1The other end of the output end is connected to a resonant inductor L in the transmission resonant module1An input terminal of (1); the resonance inductor L1Is connected to the second output of the inverter; as can be seen, the first capacitance C1Not only used for reactive compensation, but also participating in the resonance inductance L1In the process of matching resonant pulsation; the second reactive compensation module is also an LCC type reactive compensation circuit, the first reactive compensation module and the second reactive compensation module are symmetrical in circuit structure, and a second capacitor C of the second reactive compensation module2Not only used for reactive compensation in the second reactive compensation module, but also used for resonance inductance L in the receiving resonance module2And performing harmonic magnetic resonance and energy conversion.
In this embodiment, the wireless charger and the bluetooth speaker respectively include a first sampling monitoring module and a second sampling monitoring module for sampling and monitoring voltage and current signals; a first sampling monitoring module in the wireless charger is connected with the wireless charging control module; the second sampling monitoring module is connected with the sound box control module.
In this embodiment, the wireless charging control module is further configured to obtain a maximum acceptable power of the speaker, where the maximum acceptable power is determined by an existing capacity of a battery of the speaker and is sent to the first bluetooth module through a second bluetooth module of the speaker; the wireless charging control module comprises a voltage regulating unit, the voltage regulating unit firstly calculates the maximum transmissible power of the wireless charger under the condition that the voltage regulating module is not accessed, the maximum acceptable power of the battery at the side of the sound box is compared with the maximum transmissible power of the wireless charger, and if the maximum transmissible power meets the maximum acceptable power of the battery of the Bluetooth sound box, the wireless charging control module controls the voltage regulating module to be out of work; if not, the voltage regulating module is controlled to work to regulate the input voltage of the inverter.
In this embodiment, the calculation formula of the maximum transmittable power transmittable by the wireless charger under the condition that the voltage regulating module is not connected is as follows:
in the formula, pmaxFor the maximum transmission power that can be transmitted, w0A charging resonance frequency set for a transmitting resonance module of the wireless charger; l is1Is a resonant inductance value in the transmitting resonant module; l is2Receiving the inductance value of the resonance inductor in the resonance module; l isb1The inductance value of the compensation inductor in the first reactive compensation module; l isb2The inductance value of the compensation inductor in the second reactive compensation module; g is a mutual inductance influence factor obtained by testing between the resonance inductor and the corresponding compensation inductor; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; vIQmThe maximum input voltage of the input end of the first reactive compensation module is the maximum input voltage when the voltage regulation is not carried out by the voltage regulation module; vqoutAnd charging voltage for the request of the wireless charging Bluetooth loudspeaker box.
In this embodiment, the inverter is a full-bridge inverter, and in order to ensure that a switching tube of the full-bridge inverter works in a zero-voltage switching state to save power consumption, a capacitor adjusting unit for performing synchronous correction and adjustment on the first capacitor and the second capacitor to realize that the inverter works in the zero-voltage switching state is arranged in the wireless charging control module; the wireless charging control module is also provided with a current adjusting unit for adjusting the output current of the second reactive compensator so as to ensure that the wireless charger charges the Bluetooth sound box under the maximum transmission efficiency.
In this embodiment, a plurality of adjusting capacitor branches are connected in parallel to two sides of the first capacitor and the second capacitor, and in this embodiment, 2 adjusting capacitor branches are set; the adjusting capacitor branch comprises an adjusting capacitor CkAnd a controllable switch corresponding to the capacitor; the adjustment capacitor can be incorporated into two sides of the first capacitor or the second capacitor by adjusting the switch of the controllable switch, wherein the plurality of adjustment capacitor branches on two sides of the first capacitor and the second capacitor keep synchronous adjustment action, so that the correction adjustment of the first capacitor or the second capacitor can be realized.
In this embodiment, the wireless charger starts to perform pre-charging in an initial operating state immediately after receiving a "ready-to-charge" signal, where the initial operating state is that the inverter operates at an initial setting frequency w0At the working frequency, detecting whether the MOSFET switching tube in the full-bridge inverter works in a zero-voltage opening state, if so, continuously keeping the working state; if not, the adjustment is carried out through the capacitance adjusting unit, specifically:
the capacitance adjusting unit acquires the actual input voltage of the first reactive compensation module and the actual output voltage of the second reactive compensation module, which are acquired by the first sampling monitoring module, and calculates the capacitance adjusting quantity of the first reactive compensation module and the second reactive compensation module; controlling controllable switches corresponding to the adjusting capacitor branches connected in parallel at two ends of the second capacitor according to the calculated capacitor adjusting quantity; correspondingly, the controllable switches corresponding to the adjusting capacitor branches connected in parallel at the two ends of the first capacitor are synchronously controlled according to the capacitor adjusting quantity so as to adjust the first capacitor and the second capacitor; after adjustment, the resonance frequency of energy transmitted between the transmitting resonance module and the receiving resonance moduleThe rate changes, at the moment, the wireless charging control module monitors the resonant frequency and drives the full-bridge inverter to work at the working frequency w through the second driving modulegIn a state of (a) so that the operating frequency w of the full-bridge inverter is0Updated to the changed resonance frequency wg。
In this embodiment, the calculation formula of the capacitance adjustment amount is as follows:
where Δ C is the capacitance adjustment, w0Setting a resonant frequency for the work of a charging system consisting of a wireless charger and a Bluetooth sound box; c1Is a first capacitor;
the actual input voltage of the input end of the first reactive compensation module;
the actual output voltage of the output end of the second reactive compensation module is obtained; i.e. izvsThe theoretical current value flowing through the corresponding switch tube when the MOSFET switch tube reaches zero voltage turn-off; gamma is a design margin; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; l isb1The inductance value of the compensation inductor in the first reactive compensation module; l isb2The inductance value of the compensation inductor in the second reactive compensation module; l is1Is a resonant inductance value in the transmitting resonant module; p is a radical ofmaxThe maximum transmissible power of the wireless charger.
In the preferred embodiment, in order to enable the controllable switch tube of the inverter to work in the zero-voltage-switching-on working state, the capacitance adjusting branches are respectively arranged at the two ends of the first capacitor and the second capacitor, and the circuit is modeled, so that the capacitance adjusting unit for solving the problem is designed, the switching-in or the cutting-off of the adjusting capacitance branches are controlled through the calculation of the capacitance adjusting quantity, the adjustment of the first capacitor and the second capacitor is realized, and the MOSFET switch tube in the full-bridge inverter is further ensured to work in the zero-voltage-switching-on state, so that the energy consumption is reduced.
In this embodiment, when wireless charger constantly charges to bluetooth speaker, the electric capacity of battery constantly changes in the bluetooth speaker, and its internal resistance also constantly changes, and for realizing filling fast to bluetooth speaker, when battery power is lower, adopts the heavy current to carry out the constant current and charges, charges to higher back when battery power, switches to the undercurrent constant current and charges.
In this embodiment, when the charging current is switched, the charging efficiency of the wireless charger may change, so that the current adjusting unit designs a calculation method adapted to the charging efficiency of the wireless charger in the charging mode on the basis of circuit modeling of the charging system of the wireless charger and the bluetooth speaker, and based on the calculation method, it is found that the condition that the wireless charger obtains the maximum transmission efficiency is that the output current at the output end of the second reactive compensation module reaches the current set value, and the calculation formula of the current set value is as follows:
in the formula (I), the compound is shown in the specification,
is a set value of the current,
the actual output voltage of the output end of the second reactive compensation module is obtained; r1The internal resistance of an inductance coil in a transmitting resonance module in the wireless charger; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; w is acThe resonance frequency is the resonance frequency of resonance between the transmitting resonance module and the receiving resonance module; r2The internal resistance of an inductance coil in a receiving resonance module in the wireless charger; (ii) a L is1Is a resonant inductance value in the transmitting resonant module; l is2To receive the value of the resonant inductance in the resonant module.
Therefore, the wireless charger charges the Bluetooth sound box, in order to obtain the maximum transmission efficiency, firstly, the output current of the output end of the second reactive compensation module needs to be collected and monitored in real time through the second sampling monitoring module at the side of the Bluetooth sound box, the monitored output current is sent to the first Bluetooth module through Bluetooth, a differential mode of the output current is obtained by a differential control regulating circuit in the wireless charging control module through comparing the output current with a current set value, a feedback signal is generated through processing, the second driving module receives the feedback signal to regulate the turn-on time of a switching tube in the full-bridge inverter in a switching period, so that the output current value of the output end of the second reactive compensation module is close to the current set value, through so adjusting, guarantee that wireless charger keeps working under higher transmission efficiency to the charging of bluetooth speaker.
In the preferred embodiment, how to enable the charging system to work under higher transmission efficiency is explored, and the condition that the charging system obtains the maximum transmission efficiency is found; detecting the output current of the output end of a second reactive compensation module in the system according to the condition, and performing feedback control in the wireless charging control module to adjust the charging system to the working state of the maximum transmission efficiency; by adopting the adjusting control method, the control is simple and the control speed is high.
In the preferred embodiment, a wireless charging Bluetooth sound box and a wireless charger are designed, a Bluetooth module arranged in the wireless charger can be in communication connection with the Bluetooth sound box, and the charging intelligence is realized; and the specific circuit constitution of the wireless charging transmitting module of the wireless charger and the related control strategy of the control module are designed, so that the charging power for wireless charging between the wireless charger and the Bluetooth sound box is adjustable, the charging efficiency is high, the energy loss of the whole charging system is small, and the wireless charging system has a certain application prospect.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be analyzed by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A wireless charging system is characterized by comprising a wireless charging Bluetooth sound box and a wireless charger, wherein the Bluetooth sound box is arranged at the top of the wireless charger when being charged wirelessly;
the wireless charger is used for charging the Bluetooth sound box, and comprises: the wireless charging control system comprises a wireless charging transmitting module, a first rectifying module, a voltage regulating module, an inverting module, a first Bluetooth module and a wireless charging control module;
the Bluetooth sound box comprises a wireless charging receiving module, a second rectifying module, a second Bluetooth module and a sound box control module;
the wireless charging receiving module receives the coupling magnetic field energy and converts the coupling magnetic field energy into alternating current energy, and then the alternating current energy is rectified into direct current through the second rectifying module to charge the built-in battery of the Bluetooth sound box;
the first Bluetooth module and the second Bluetooth module realize mutual communication through Bluetooth connection in a wireless charging process, and the first Bluetooth module is connected with a communication end of the wireless charging control module; the second Bluetooth module is connected with the communication end of the sound box control module;
the wireless charging transmitting module comprises a first reactive power compensation module and a transmitting resonance module, alternating current at the output end of the inverter is compensated by the first reactive power compensation module, and electric energy is converted into an electromagnetic field by the transmitting resonance module; the wireless charging receiving module comprises a receiving resonance module and a second reactive compensation module, and the receiving resonance module receives electromagnetic field energy transmitted by the transmitting resonance module, converts the electromagnetic field energy into electric energy and then compensates the electric energy through the second reactive compensation module;
the wireless charging control module is further used for obtaining the maximum acceptable power of the loudspeaker box, the maximum acceptable power is determined by the existing capacity of a loudspeaker box battery, and the maximum acceptable power is sent to the first Bluetooth module through the second Bluetooth module of the loudspeaker box; the wireless charging control module comprises a voltage regulating unit, the voltage regulating unit firstly calculates the maximum transmissible power of the wireless charger under the condition that the voltage regulating module is not accessed, the maximum acceptable power of the battery at the side of the sound box is compared with the maximum transmissible power of the wireless charger, and if the maximum transmissible power meets the maximum acceptable power of the battery of the Bluetooth sound box, the wireless charging control module controls the voltage regulating module to be out of work; if not, controlling the voltage regulating module to work to regulate the input voltage of the inverter;
the calculation formula of the maximum transmissible power which can be transmitted by the wireless charger under the condition that the voltage regulating module is not connected is as follows:
in the formula, pmaxFor the maximum transmission power that can be transmitted, w0A charging resonance frequency set for a transmitting resonance module of the wireless charger; l is1Is a resonant inductance value in the transmitting resonant module; l is2Receiving the inductance value of the resonance inductor in the resonance module; l isb1The inductance value of the compensation inductor in the first reactive compensation module; l isb2The inductance value of the compensation inductor in the second reactive compensation module; g is a mutual inductance influence factor obtained by testing between the resonance inductor and the corresponding compensation inductor; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; vIQmThe maximum input voltage of the input end of the first reactive compensation module is the maximum input voltage when the voltage regulation is not carried out by the voltage regulation module; vqoutCharging voltage for the request of the wireless charging Bluetooth sound box;
the wireless charger starts to carry out pre-charging in an initial working state just after receiving a signal of 'preparation for charging', wherein the initial working state is that the inverter works at an initial set frequency w0Work ofAt the frequency, detecting whether the MOSFET switching tube in the full-bridge inverter works in a zero-voltage switching-on state or not, and if so, continuously keeping the working state; if not, the adjustment is carried out through the capacitance adjusting unit, specifically:
the capacitance adjusting unit acquires the actual input voltage of the first reactive compensation module and the actual output voltage of the second reactive compensation module, which are acquired by the first sampling monitoring module, and calculates the capacitance adjusting quantity of the first reactive compensation module and the second reactive compensation module; controlling controllable switches corresponding to the adjusting capacitor branches connected in parallel at two ends of the second capacitor according to the calculated capacitor adjusting quantity; correspondingly, the controllable switches corresponding to the adjusting capacitor branches connected in parallel at the two ends of the first capacitor are synchronously controlled according to the capacitor adjusting quantity so as to adjust the first capacitor and the second capacitor; after adjustment, the resonant frequency of energy transmitted between the transmitting resonant module and the receiving resonant module changes, at the moment, the wireless charging control module monitors the resonant frequency and drives the full-bridge inverter to work at the working frequency of w through the second driving modulegIn a state of (a) so that the operating frequency w of the full-bridge inverter is0Updated to the changed resonance frequency wg；
The calculation formula of the capacitance adjustment quantity is as follows:
where Δ C is the capacitance adjustment, w0Setting a resonant frequency for the work of a charging system consisting of a wireless charger and a Bluetooth sound box; c1Is a first capacitor;
the actual input voltage of the input end of the first reactive compensation module;
the actual output voltage of the output end of the second reactive compensation module is obtained; i.e. izvsTheoretical electricity flowing through corresponding switch tube when MOSFET switch tube reaches zero voltage turn-offA flow value; gamma is a design margin; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; l isb1The inductance value of the compensation inductor in the first reactive compensation module; l isb2The inductance value of the compensation inductor in the second reactive compensation module; l is1Is a resonant inductance value in the transmitting resonant module; p is a radical ofmaxMaximum transmissible power for a wireless charger;
the wireless charger obtains the maximum transmission efficiency under the condition that the output current of the output end of the second reactive compensation module reaches a current set value, and the calculation formula of the current set value is as follows:
in the formula (I), the compound is shown in the specification,
is a set value of the current,
the actual output voltage of the output end of the second reactive compensation module is obtained; r1The internal resistance of an inductance coil in a transmitting resonance module in the wireless charger; k is a coupling coefficient between a resonant inductor in the transmitting resonant module and a resonant inductor in the receiving resonant module; w is acThe resonance frequency is the resonance frequency of resonance between the transmitting resonance module and the receiving resonance module; r2The internal resistance of an inductance coil in a receiving resonance module in the wireless charger; l is1Is a resonant inductance value in the transmitting resonant module; l is2To receive the value of the resonant inductance in the resonant module.
2. The wireless charging system of claim 1, wherein the wireless charger further comprises a magnetic isolation module located in the middle of the wireless charger, the wireless charging transmitting module, the first rectifying module, the voltage regulating module and the inverting module are located on the upper portion of the magnetic isolation module, and the first bluetooth module and the wireless charging control module are located on the lower portion of the magnetic isolation module and used for isolating interference of a high-frequency magnetic field in the upper space of the magnetic isolation module on the wireless charging control module and the first bluetooth module.
3. The wireless charging system of claim 1, wherein the first bluetooth module comprises: the Bluetooth radio frequency antenna, the Bluetooth radio frequency control unit, the Bluetooth power amplifier unit and the Bluetooth loudspeaker are arranged on the Bluetooth radio frequency antenna; the Bluetooth power amplification unit is used for amplifying the power of the signal received by the first Bluetooth module, and then performing electroacoustic conversion on the signal through a Bluetooth loudspeaker to broadcast the working state of the wireless charger; the Bluetooth radio frequency control unit is used for controlling the strength of the transmitted signal intensity of the Bluetooth radio frequency antenna.
4. The wireless charging system of claim 1, wherein a limiting module is disposed on a top of the wireless charger to limit a position of the bluetooth speaker, so as to ensure that the wireless charging receiving module and the wireless charging transmitting module of the bluetooth speaker are not offset and are coupled completely.
5. The wireless charging system of claim 1, wherein the wireless charging transmitting module comprises a first reactive compensation module and a transmitting resonance module, and alternating current at the output end of the inverter is compensated by the first reactive compensation module and then converted into an electromagnetic field by the transmitting resonance module; the wireless charging receiving module comprises a receiving resonance module and a second reactive compensation module, the receiving resonance module receives electromagnetic field energy transmitted by the transmitting resonance module, and the electromagnetic field energy is converted into electric energy and then compensated by the second reactive compensation module.
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