CN104158269A - Wireless charging transmitter, receiver, charging device and wireless charging method - Google Patents
Wireless charging transmitter, receiver, charging device and wireless charging method Download PDFInfo
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Abstract
The invention discloses a wireless charging transmitter, a receiver, a charging device and a wireless charging method. The wireless charging transmitter comprises a first microcontroller, a drive circuit, a resonant transmitting circuit, a PPM (pulse position modulation) decoding circuit and a power circuit; the wireless charging receiver comprises a resonant receiving circuit, a full-bridge rectifier circuit, a DC-DC conversion circuit, a current sensor, a lithium battery, an analog sampling circuit, a second microcontroller and a PPM transmitting circuit; and the wireless charging device comprises the above wireless charging transmitter and the receiver. The principle of electromagnetic coupling is used by the invention to transmit electromagnetic energy; a primary coil and a secondary coil also serve as communication coils, and charging feedback data are transmitted in a PPM mode for intelligent control on the transmission power; the realization mode is simple, the transmission power is large, the power consumption is low, and the cost is low; and the transmitter, the receiver and the charging device can be widely applied to various digital products with power no more than 10W.
Description
Technical field
The present invention relates to a kind of wireless charging reflector, receiver, charging device and wireless charging method.
Background technology
Wireless charging technology is the emerging technology of in recent years rising, and the wireless charging based on electromagnetic induction principle is applied comparative maturity at present.Wireless charging technology reveals great potential in E-consumer class market table now, in the situation without connecting power line, to portable electric appts, charging provides a kind of solution easily.Major Epidemic is used the wireless charging power supply of WPC alliance on the market, its principle is also based on electromagnetic induction principle, and receiver is to reflector feedback information code, and modulation system is simulation and the digital PING mode combining, power output is 5W, and main receiving end is smart mobile phone.Yet for charge powers such as flat boards, require the electronic equipment of 10W, there is no on the market relatively ripe product.
And WPC alliance wireless charging technology has following deficiency and restriction:
(1) power output is little, is only limited to the low-power electrical device below 5W;
(2) electric power transfer distance short (maximum normal distance is 2CM), primary coil and secondary winding when strengthening, the reduction of feedback data packet reliability;
(3) packet modulation system consumed power is large, affects power output.
(4) use extra communication module (such as RFID, bluetooth, Zigbee etc.) that receiving end data message is fed back to transmitting terminal, as charger, will greatly increase R&D costs, be unfavorable for commercialization.
Summary of the invention
Not enough and the restriction for prior art, the present invention wants technical solution problem to be to provide a kind of wireless charging reflector, receiver, charging device and wireless charging method, electric power primary coil and secondary winding double as communication coil, solve the deficiencies such as power output is little, electric weight vertical transfer distance is short, feedback data code modulation mode power consumption is large.
Technical scheme of the present invention is:
A wireless charging reflector, comprises the first microcontroller, drive circuit, resonance radiating circuit, PPM decoding circuit
And power circuit; The first microcontroller, drive circuit and resonance radiating circuit are connected successively; Resonance radiating circuit passes through
PPM decoding circuit is connected with the signal feedback end of the first microcontroller, described the first microcontroller and drive circuit all with
Power circuit connects;
Described drive circuit comprises that full-bridge drives chip UBA2032T and full-bridge circuit;
Described resonance radiating circuit comprises primary coil and the first resonant capacitance (1);
Described PPM decoding circuit comprises buffer circuit, signal amplification circuit, second order bandwidth-limited circuit and the hysteresis comparison circuit connecting successively;
Described power circuit comprises AC-DC translation circuit and DC-DC power supply circuits, the output of AC-DC translation circuit is connected with the input of DC-DC power supply circuits, the upper brachium pontis power supply that described AC-DC translation circuit output voltage is full-bridge circuit, described DC-DC power supply circuits are the first microcontroller power supply.
Described resonance radiating circuit is also directly connected with the first microcontroller.
Further, described AC-DC translation circuit is directly by mains-supplied.
A wireless charging receiver, comprises resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, current sensor, lithium battery, analog sampling circuit, the second microcontroller and PPM radiating circuit; Resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, current sensor are connected successively with lithium battery, analog sampling circuit input end is connected with DC-DC change-over circuit output, analog sampling circuit output end is all connected with the second microcontroller with current sensor output, the second microcontroller is connected with PPM radiating circuit, and PPM radiating circuit output is connected with resonance receiving circuit;
Described resonance receiving circuit, comprises secondary winding and the second resonant capacitance (2);
Between described full bridge rectifier and the second microcontroller, be also connected with switching regulator IC NCP699.
Further, described PPM radiating circuit comprises high speed photo coupling and switch MOS pipe, for the train pulse of the second microcontroller output is carried out to power amplification.
A wireless charging device, comprises above-mentioned wireless charging reflector and above-mentioned wireless charging receiver, and described primary coil and secondary winding are placed in upper and lower parallel aligned mode, and primary coil and secondary winding are communication coil simultaneously.
Further, described the first microcontroller and the second microcontroller are C8051F330 single-chip microcomputer.
A wireless charging method, adopts above-mentioned wireless charging device, comprises the following steps:
Step 1: wireless charging reflector powers on, concurrent power transmission magnetic signal; If do not receive feedback signal, enter holding state;
Step 2: wireless charging receiver is received after electromagnetic signal, sends feedback signal to wireless charging reflector;
Step 3: the first microcontroller is identified to the received signal, if the feedback signal that wireless charging reflector sends starts to wireless charging receiver transmission electric weight;
Step 4: the second microcontroller gathers the output voltage of DC-DC change-over circuit by analog sampling circuit, by the current sensor output current of sampling;
If there is overvoltage or overcurrent, the second microcontroller sends cut-off signals to switching regulator IC NCP699, stops sending feedback signal, electric weight Transmission;
Otherwise the second microcontroller carries out PPM coding to the output voltage sampling and output current signal, produce feedback signal and send to wireless charging reflector through PPM radiating circuit and secondary winding; Primary coil receiving feedback signals, sends to the first microcontroller through the decoding of PPM decoding circuit; The first microcontroller reads feedback signal and judges, when charge power is during lower than preset charged power, increases PWM output pulse frequency, i.e. central task frequency, makes it toward the adjustment of resonance frequency direction, and resonance amplitude strengthens and then increases charge power; When charge power is during higher than preset charged power, reduce PWM output pulse frequency and make it away from resonance frequency, thereby resonance amplitude reduces charge power; So, maintain the constant of charge power.
When described wireless charging reflector powers on, set PWM output pulse frequency, i.e. central task frequency is lower than resonance frequency.
Further, described step 3 also comprises:
The first microcontroller is sampled to the alternating voltage peak of exporting on primary coil, and amplitude voltage representative value and resonant peak voltage comparison:
(1) metallic foreign body meeting absorption of electromagnetic energy, reduces transmitting coil inductance value.Under same frequency, when inductance value reduces, resonance amplitude can become large.If the crest voltage of sampling in resonant peak voltage ± 5%, illustrates on emission base, have metallic foreign body, the first microcontroller turn-offs pwm pulse signal, and then stops charging;
(2) if the crest voltage of sampling lower than amplitude voltage representative value, the first microcontroller increases central task frequency according to the non-linear Correction and Control rule of frequency; If the crest voltage of sampling is higher than amplitude voltage representative value, the first microcontroller reduces central task frequency according to the non-linear Correction and Control rule of frequency;
Described amplitude voltage representative value refers under the PWM output pulse frequency of setting, the alternating voltage peak theoretical value of exporting on primary coil; Described resonant peak voltage refers to when setting PWM output pulse frequency equals resonance frequency, the alternating voltage peak theoretical value of exporting on primary coil.
Further, when described wireless charging reflector powers on, set PWM output pulse frequency, i.e. central task frequency is 120kHZ, and resonance frequency is 150kHZ, PWM output pulse frequency, i.e. and central task frequency is adjusted within the scope of 90kHZ-150kHZ.
PWM output pulse frequency is defined as central task frequency in the present invention, and the frequency of LC coupling is natural resonance frequency, is called resonance frequency.
Analog sampling circuit is sampled to charging voltage and electric current; Plate live flow sensor (ACS712) in wireless charging receiver output circuit, is sensed as voltage signal by output current signal and sends into the second microcontroller detection, and current sensor is powered by NCP699.The second microcontroller carries out PPM coding by sampled signal, formation sequence pulse, through PPM radiating circuit, output to the secondary winding of wireless charging receiver, thereby receiving end charge information is fed back to wireless charging reflector, and the PPM decoding circuit of wireless charging reflector is processed so that the first microcontroller can read and decode the feedback data packet of wireless charging receiver.The first microcontroller reads charging feedback information, thereby learns charging end charge power demand.The first microcontroller is by built-in algorithms program, when charge power is during lower than preset charged power, increases PWM output pulse frequency (central task frequency) and makes it toward the adjustment of resonance frequency direction, and resonance amplitude strengthens and then increases charge power; When charge power is during higher than preset charged power, reduce PWM output pulse frequency and make it away from resonance frequency, thereby resonance amplitude reduces charge power.So, maintained the constant of charge power.
Beneficial effect:
1. power transmission coil is simultaneously as communication coil, [PPM is the abbreviation of English Pulse Position Modulation to use PPM code modulation mode feedback charge information, the Chinese meaning is pulse position modulation, claim again pulse-position modulation, its composition mostly is first code+umber of pulse, PPM is simple with its coded system, easy to use and be once widely used in some wireless remote-control systems], do not need extra communication module, implementation is simple, packet feedback is reliable, through-put power is large, low in energy consumption, support short-range communication, even if primary coil and secondary winding still can reliable communications at a distance of 5CM at consistency from top to bottom.Packet adopts ID sign, has realized automatic target recognition function.Utilize the domestic-investment source of C8051F330 monolithic Bigpian, realize the functions such as foreign matter detection and resonance power automatic tuning, make electric weight high efficiency of transmission, there is higher practicality.
2. AC-DC modular converter is embedded on plank, can directly from civil power, obtains electric weight, during wireless charging power work, without external adapter, comparing supply power mode is on the market that USB power supply is more convenient reliable; Adopt full-bridge topology circuit, with small voltage, obtain high transmit power; Receiver adopts high-performance DC-DC transducer, makes Maximum Power Output reach 15W.
3. the present invention can reduce production costs greatly, is easy to commercialization.
Accompanying drawing explanation
Fig. 1 is the theory diagram of wireless charging device of the present invention.
Fig. 2 is wireless charging reflector theory diagram.
Fig. 3 is wireless charging receiver theory diagram.
Fig. 4 is feedback data packet structure chart of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, a kind of wireless charging device, is characterized in that, comprises wireless charging reflector and wireless charging receiver.Wireless charging emitter driver circuitry encourages primary coil with characteristic frequency, resonance primary coil produces LC resonance with first resonant capacitance 1 of connecting and generates electromagnetic waves, and described wireless charging receiver is received electromagnetic energy and passed through DC-DC change-over circuit to lithium cell charging by LC match circuit.
Further, the microcontroller of wireless charging receiver is sampled to output voltage and electric current by analog sampling circuit and current sensor, and by analog signal assembly coding, the PPM signal of generation is communicated by letter by secondary winding charge information to primary coil.
As shown in Figure 2, wireless charging reflector comprises AC-DC translation circuit, DC-DC power supply circuits, drive circuit, the first microcontroller, PPM decoding circuit and resonance radiating circuit.
The first microcontroller Main Function is: the alternating voltage peak on primary coil is sampled, PWM output pulse frequency is finely tuned, stable resonant oscillation transmitting power; The signal that PPM decoding circuit is processed carries out pulse position modulation digital decoding; PWM driving pulse by PCA module output 120kHZ exports driving chip to; By detecting the height of sampling and outputting voltage peak-to-peak value, can judge on emission base whether have metallic foreign body, if sampled peak voltage, in resonant peak voltage ± 5%, turn-offs pwm pulse signal, and then stop charging.
In LC resonator system, there is certain error in resonant capacitance, inductance coupling, during LC resonance, actual resonant capacitance, inductance error can match the former design resonance point combination of skew, while causing producing in enormous quantities, LC resonance point is inconsistent, transmitting power and design predetermined value be deviation (exceed ± 2%) to some extent, reduces conforming product rate.LC resonator system has several key properties: the first, and each group resonance coil is different from the combination resonance curve of electric capacity; The second, different driving voltage lower curve is also different; The 3rd, when reflector is worked, detect and whether have metallic foreign body to exist.So, required resonance coil, electric capacity actual resonance frequency, and they are in the typical curve without under metallic foreign body and parameter thereof, before wireless charger dispatches from the factory, by summing up lot of experimental data, determine, by scan mode by the typical curve programming of coil in the EEPROM of circuit.After dispatching from the factory, each group wireless charging system all has own typical curve record, and during work, the first microcontroller passes through lookup table mode, contrasts amplitude state under now central task frequency and the measures of dispersion of representative value.If now amplitude voltage is lower than amplitude voltage representative value, the first microcontroller, by lookup table mode, increases central task frequency amplitude is increased; Amplitude voltage is higher than amplitude voltage representative value, and the first microcontroller reduces central task frequency reduces amplitude.The increase that now central task frequency is concrete and decrease are to carry out according to the control law (great many of experiments sums up) in table, the corresponding amplitude of each frequency.In native system, the resonance frequency of the value of establishing is 150kHZ, and central task frequency is 120kHZ, and frequency resolution degree is 1kHZ, and analytic frequency lower range is 90kHZ-120kHZ, and upper range is 120kHZ-150kHZ, and above control mode is the non-linear correction of frequency.By the non-linear correction technique of frequency, the effect reaching is: realize frequency conversion, Modulating Power, stable transmitting and charge power; Eliminate LC error, while making volume production transmitting power error remain on ± 2%; Detect and whether have the metallic foreign body of potential safety hazard to exist.
When transmitter module powers on, initial central task frequency is 120kHZ.The peak-to-peak value voltage that the first microcontroller is sampled by parsing, with representative value comparison, makes frequency within the scope of 90kHZ-150kHZ, change centered by 120KHZ by the resolution of 1KHZ by the non-linear correction technique of frequency, stable transmission power.
In resonator system, when PWM output pulse frequency equals resonance frequency, resonance amplitude is maximum.Amplitude is large, and power output is just large.PWM output pulse frequency is set lower than resonance frequency, when PWM output frequency is during away from resonance frequency, amplitude reduces; PWM output frequency is during near resonance frequency, and amplitude increases.Around this principle, regulate just adjustable output power of PWM output pulse frequency.
AC-DC translation circuit is comprised of AC-DC power module and peripheral circuit thereof, mainly completes following function: output 15V direct voltage, as wireless charging reflector principal voltage, acts on brachium pontis on full-bridge circuit, and power output is 15W, is the power supply of DC-DC power supply circuits.AC-DC power module is selected the AKF-15S15 of MinMAX company.
DC-DC power supply circuits are mainly comprised of 5V supply module and 3.3V supply module, and wherein, 5V supply module is as the voltage that draws high of the PWM output signal of the first microcontroller, and as the input voltage of 3.3V supply module; 3.3V module is the first microcontroller power supply.5V supply module is selected the TPS54231D switching regulator IC of TI company, and 3.3V supply module is selected AMS1117-3.3 chip.
Drive circuit mainly drives chip and full-bridge topology the electric circuit constitute by full-bridge, mainly complete following function: full-bridge chip receives the PWM driving pulse of the first microcontroller, its level is changed and power amplification, export the PWM driving pulse of two-way certain frequency, phase phasic difference 180 degree, drive respectively the power MOS pipe at the upper and lower diagonal angle of full-bridge circuit.Full-bridge topology circuit output frequency is the positive and negative square wave of interchange that 120kHZ, peak-to-peak value are 30V.Wherein, full-bridge drives chip to select the high power of PHILIPS Co. to drive chip UBA2032T.
Resonance radiating circuit is comprised of series resonance mode the first resonant capacitance 1 and resonance primary coil, mainly completes following functions: the first resonant capacitance 1 and primary coil produce resonance under positive and negative square wave excitation and send electromagnetic wave exchanging; The double communication coil of doing of primary coil is used.Central task frequency setting of the present invention is 120kHZ, electric capacity and coil according to
carry out parameter matching, resonance frequency is 150KHZ.As Primary Component, electric capacity is selected the multi-level resonant capacitance of high power, and coil is selected high Q inductor coil.
PPM decoding circuit is mainly comprised of buffer circuit, signal amplification circuit, second order bandwidth-limited circuit, hysteresis comparison circuit.Its operation principle: during charging system work, the emitter follower Buffer output that the PPM modulation intelligence that the wireless receiver receiving on PPM decoding circuit reception primary coil sends first forms via amplifier, then through signal amplification circuit and second order bandwidth-limited circuit, amplify and filtering, send into hysteresis loop comparator and carry out shaping pulse, the PPM modulation signal of 50kHZ is converted into the pulse signal that the first microcontroller can read.Circuit consists of a slice four tunnel amplifier LM324 and peripheral components thereof.
As shown in Figure 3, wireless receiver: mainly by LC resonant circuit, full bridge rectifier, DC-DC change-over circuit,
Analog sampling circuit, the second microcontroller and PPM radiating circuit form.
In receiver LC resonant circuit, the second resonant capacitance 2 is connected with series system with secondary winding, electric capacity and coil according to
carry out parameter matching, parameter matching considers receiving efficiency, and as Primary Component, electric capacity is selected the multi-level resonant capacitance of high power, and coil is selected high Q inductor coil.
Full bridge rectifier is formed by four Schottky Rectifier SS39 overlap joints, and induced voltage is carried out to rectification.
DC-DC change-over circuit is comprised of switching regulator IC and peripheral circuit thereof, and its major function is as follows: by 10V direct voltage chopping depressuring to 5 V of full bridge rectifier output, and lithium battery is charged.Consider that dull and stereotyped lithium cell charging power is 10W, the LM2596-5 that DC-DC switching regulator IC adopts NS company to produce, making receiver is 15W charging normal peak power output in situation.
As shown in Figure 3, the second microcontroller is sampled to the charging current of DC-DC transducer output, and the 5V voltage of output is carried out to four tunnel analog samplings, and four road sampled points are the output charging voltage after dividing potential drop, to improve sampling precision, are beneficial to coding.Sampled voltage and current signal are input to microcontroller after RC low-pass filtering, and the second microcontroller Dui Si road analog voltage and current signal carry out digit pulse modulating-coding (PPM), and send corresponding pulse train, drive PPM radiating circuit.Concrete principle is: first the second microcontroller exports the frame-synchronizing impulse of certain width, then the second microcontroller is sampled to current signal He Si road output analog voltage signal, wherein Jiang Si road analog sampling value is averaging, to improve sampling precision, and the average voltage of obtaining and current value are carried out to A/D conversion.Then counter subtracts 1 computing, when counter reduces to 0, and the second microcontroller output PPM train pulse.Demodulation is dependent on the relative position of each pulse, separates timing and only need judge the time interval between PPM pulse and lock-out pulse and just can obtain digital signal.The second microcontroller is sampled to output voltage by analog sampling circuit, and after lithium battery voltage is full of, the second microcontroller sends cut-off signals to NCP699 and stops charging action, to protect battery.
PPM radiating circuit is comprised of optocoupler and switch MOS pipe: high speed photo coupling receives the pulse train that the second microcontroller sends, and pulse sequence carries out level power and amplify driving switch metal-oxide-semiconductor, switching tube is opened with Louing and is exported feedback data packet is sent to wireless charging reflector by secondary winding.The first microcontroller reads charging feedback information, thereby learns charging end charge power demand.The first microcontroller is by built-in algorithms program, when charge power is during lower than preset charged power, increases PWM output pulse frequency it is moved toward resonance frequency direction, and resonance amplitude strengthens and then increases charge power; When charge power is during higher than preset charged power, reduce PWM output pulse frequency and make it away from resonance frequency, thereby resonance amplitude reduces charge power.So, maintained the constant of charge power.
The present invention selects PPM (pulse position modulation) modulation system, and feedback data package definition as shown in Figure 4, comprising: packet header sign, is used to specify data packet transmission data content; ID sign, for identifying packet; Data code groups, for transmitting output current voltage data information; Check sum, carries out verification for the error code that transmitting procedure is occurred, reduces the error rate.Following table 1 is feedback data pack arrangement.
Table 1 feedback data pack arrangement
Further, if wireless charging reflector is not received the packet that wireless charging receiver sends after powering on, wireless charging reflector is not launched electromagnetic energy, in holding state, until receive feedback data packet.Wireless charging reflector is identified by receiving the ID flag bit of packet.Wireless charging power source charges process is: when expelling plate powers on, expelling plate transmits electric weight to dash receiver, and now expelling plate does not receive dash receiver feedback signal (PPM host-host protocol), in holding state; Secondary winding receives electromagnetic energy, induces voltage and powers to receiving system, and microcontroller is started working and generated feedback signal, through power amplification, feeds back to expelling plate, and expelling plate just turns to operating state by holding state after receiving feedback signal.
Claims (9)
1. a wireless charging reflector, is characterized in that, comprises the first microcontroller, drive circuit, resonance radiating circuit, PPM decoding circuit and power circuit; The first microcontroller, drive circuit and resonance radiating circuit are connected successively; Resonance radiating circuit is connected with the signal feedback end of the first microcontroller by PPM decoding circuit, and described the first microcontroller is all connected with power circuit with drive circuit;
Described drive circuit comprises that full-bridge drives chip UBA2032T and full-bridge circuit;
Described resonance radiating circuit comprises primary coil and the first resonant capacitance (1);
Described PPM decoding circuit comprises buffer circuit, signal amplification circuit, second order bandwidth-limited circuit and the hysteresis comparison circuit connecting successively;
Described power circuit comprises AC-DC translation circuit and DC-DC power supply circuits, the output of AC-DC translation circuit is connected with the input of DC-DC power supply circuits, the upper brachium pontis power supply that described AC-DC translation circuit output voltage is full-bridge circuit, described DC-DC power supply circuits are the first microcontroller power supply.
Described resonance radiating circuit is also directly connected with the first microcontroller.
2. wireless charging reflector according to claim 1, is characterized in that, described AC-DC translation circuit is directly by mains-supplied.
3. a wireless charging receiver, is characterized in that, comprises resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, current sensor, lithium battery, analog sampling circuit, the second microcontroller and PPM radiating circuit; Resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, current sensor are connected successively with lithium battery, analog sampling circuit input end is connected with DC-DC change-over circuit output, analog sampling circuit output end is all connected with the second microcontroller with current sensor output, the second microcontroller is connected with PPM radiating circuit, and PPM radiating circuit output is connected with resonance receiving circuit;
Described resonance receiving circuit, comprises secondary winding and the second resonant capacitance (2);
Between described full bridge rectifier and the second microcontroller, be also connected with switching regulator IC NCP699.
4. wireless charging receiver according to claim 3, is characterized in that, described PPM radiating circuit comprises high speed photo coupling and switch MOS pipe, for the train pulse of the second microcontroller output is carried out to power amplification.
5. a wireless charging device, it is characterized in that, comprise in claim 1-2 the wireless charging receiver described in any one in the wireless charging reflector described in any one and claim 3-4, described primary coil and secondary winding are placed in upper and lower parallel aligned mode, and primary coil and secondary winding are communication coil simultaneously.
6. wireless charging device according to claim 5, is characterized in that, described the first microcontroller and the second microcontroller are C8051F330 single-chip microcomputer.
7. a wireless charging method, is characterized in that, adopts wireless charging device claimed in claim 8, comprises the following steps:
Step 1: wireless charging reflector powers on, concurrent power transmission magnetic signal; If do not receive feedback signal, enter holding state;
Step 2: wireless charging receiver is received after electromagnetic signal, sends feedback signal to wireless charging reflector;
Step 3: the first microcontroller is identified to the received signal, if the feedback signal that wireless charging reflector sends starts to wireless charging receiver transmission electric weight;
Step 4: the second microcontroller gathers the output voltage of DC-DC change-over circuit by analog sampling circuit, by the current sensor output current of sampling;
If there is overvoltage or overcurrent, the second microcontroller sends cut-off signals to switching regulator IC NCP699, stops sending feedback signal, electric weight Transmission;
Otherwise the second microcontroller carries out PPM coding to the output voltage sampling and output current signal, produce feedback signal and send to wireless charging reflector through PPM radiating circuit and secondary winding; Primary coil receiving feedback signals, sends to the first microcontroller through the decoding of PPM decoding circuit; The first microcontroller reads feedback signal and judges, when charge power is during lower than preset charged power, increases PWM output pulse frequency; When charge power is during higher than preset charged power, reduce PWM output pulse frequency;
When described wireless charging reflector powers on, set PWM output pulse frequency lower than resonance frequency.
8. wireless charging method according to claim 7, is characterized in that, described step 3 also comprises:
The first microcontroller is sampled to the alternating voltage peak of exporting on primary coil, and amplitude voltage representative value and resonant peak voltage comparison:
(1) if the crest voltage of sampling in resonant peak voltage ± 5%, illustrates on emission base, have metallic foreign body, the first microcontroller turn-offs pwm pulse signal, and then stops charging;
(2) if the crest voltage of sampling lower than amplitude voltage representative value, the first microcontroller increases central task frequency according to the control law of setting; If the crest voltage of sampling is higher than amplitude voltage representative value, the first microcontroller reduces central task frequency according to the control law of setting;
Described amplitude voltage representative value refers under the PWM output pulse frequency of setting, the alternating voltage peak theoretical value of exporting on primary coil; Described resonant peak voltage refers to when setting PWM output pulse frequency equals resonance frequency, the alternating voltage resonance peak theoretical value of exporting on primary coil.
9. wireless charging method according to claim 7, is characterized in that, when described wireless charging reflector powers on, setting PWM output pulse frequency is 120kHZ, and resonance frequency is 150kHZ, and PWM output pulse frequency is adjusted within the scope of 90kHZ-150kHZ.
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| CN104362773A (en) * | 2014-11-28 | 2015-02-18 | 成都信息工程学院 | Wireless electric energy transmitting device |
| CN104393689A (en) * | 2014-12-10 | 2015-03-04 | 浙江大学 | Wireless charger and charging method of notebook computer |
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