CN204190475U - A kind of wireless charging reflector and wireless charging device - Google Patents
A kind of wireless charging reflector and wireless charging device Download PDFInfo
- Publication number
- CN204190475U CN204190475U CN201420450334.4U CN201420450334U CN204190475U CN 204190475 U CN204190475 U CN 204190475U CN 201420450334 U CN201420450334 U CN 201420450334U CN 204190475 U CN204190475 U CN 204190475U
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Abstract
The utility model discloses a kind of wireless charging reflector and wireless charging device, wireless charging reflector comprises pwm pulse generator, drive circuit, resonance transmission circuit, PPM decoding circuit and power circuit; Wireless charging device comprises above-mentioned wireless charging reflector and wireless charging receiver, and wireless charging receiver comprises resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, lithium battery, analog sampling circuit, PPM coding circuit and PPM radiating circuit.The utility model utilizes electromagnetic coupled principle, transmit electromagnetic energy, simultaneously, transmitting coil and receiving coil is double does communication coil, charging feedback data are transmitted by pulse position modulation mode (PPM), Based Intelligent Control is carried out to through-put power, implementation is simple, through-put power is large, low in energy consumption, low cost and other advantages, the digital product of all kinds of 10W and below 10W power can be widely used in.
Description
Technical field
The utility model relates to a kind of wireless charging reflector and wireless charging device.
Background technology
Wireless charging technology is the emerging technology of in recent years rising, and the current Application comparison of the wireless charging based on electromagnetic induction principle is ripe.Present wireless charging technology reveals great potential in E-consumer class market table, for providing one solution easily without when connecting power line to portable electric appts charging.Major Epidemic uses 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 the PING mode that simulation and numeral combine, power output is 5W, and main receiving end is smart mobile phone.But the electronic equipment of 10W is required for charge powers such as flat boards, there is no the product of relative maturity on the market.
Further, WPC alliance wireless charging technology has following deficiency and restriction:
(1) power output is little, is only limited to the low-power electrical device of below 5W;
(2) electric power transfer is apart from short (maximum normal distance is 2CM), and when transmitting coil and receiving coil distance strengthen, feedback data packet reliability reduces;
(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, greatly will increase R&D costs, and be unfavorable for commercialization.
Utility model content
Not enough and the restriction for prior art, the utility model wants technical solution problem to be to provide a kind of wireless charging reflector and wireless charging device, power transmission coil and receiving coil double as communication coil, solve little, the electricity vertical transfer of power output apart from the deficiency such as short, feedback data code modulation mode power consumption is large.
The technical solution of the utility model is:
A kind of wireless charging reflector, comprises pwm pulse generator 1, drive circuit, resonance transmission circuit, PPM decoding circuit and power circuit; Pwm pulse generator 1, drive circuit are connected successively with resonance transmission circuit; Resonance transmission circuit is connected with the signal feedback end of pwm pulse generator 1 by PPM decoding circuit, and described pwm pulse generator 1 is all connected with power circuit with drive circuit;
Described drive circuit comprises full-bridge driving chip UBA2032T and full-bridge circuit; Driving chip is used for carrying out power amplification and level translation to the driving pulse that pwm pulse generator 1 sends, and the driving pulse exporting two pairs of phase 180 degree drives full-bridge circuit work;
Described resonance transmission circuit comprises transmitting coil and resonant capacitance 2;
Described PPM decoding circuit comprises the buffer circuit, signal amplification circuit, second order bandwidth-limited circuit and the hysteresis comparison circuit that connect 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, described AC-DC translation circuit output voltage is that the upper brachium pontis of full-bridge circuit is powered, and described DC-DC power supply circuits are that pwm pulse generator 1 is powered.
Further, described resonance transmission circuit is also directly connected with pwm pulse generator 1.Output AC voltage peak value on pwm pulse generator 1 pair of transmitting coil is sampled, and compares with the fiducial value set in it, adjustment PWM driving pulse frequency, and then adjustment transmitting power automatically; Simultaneously by detecting peak values of ac size, can judge whether wireless charging emission source has metallic foreign body.
Further, described AC-DC translation circuit is directly by mains-supplied.
A kind of wireless charging receiver, comprises resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, current sensor, lithium battery, analog sampling circuit, PPM coding circuit (3) 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 and current sensor output are all connected with PPM coding circuit (3), PPM coding circuit (3) is connected with PPM radiating circuit, and PPM radiating circuit output is connected with resonance receiving circuit;
Described resonance receiving circuit, comprises receiving coil and resonant capacitance 4;
Further, described PPM radiating circuit comprises high speed photo coupling and switch MOS pipe, carries out power amplification for the train pulse exported PPM coding circuit 3.
Further, switching regulator IC NCP699 is also connected with between described full bridge rectifier and PPM coding circuit 3.
A kind of wireless charging device, it is characterized in that, comprise above-mentioned wireless charging reflector and above-mentioned wireless charging receiver, described transmitting coil and receiving coil are placed in upper and lower parallel alignment mode, and transmitting coil and receiving coil are communication coil simultaneously.
Analog sampling circuit and current sensor are sampled to charging voltage and electric current, sampled signal is carried out PPM coding by PPM coding circuit 3, formation sequence pulse, the receiving coil of wireless charging receiver is outputted to through PPM radiating circuit, thus receiving end charge information is fed back to wireless charging reflector, the feedback data packet of PPM decoding circuit to wireless charging receiver of wireless charging reflector processes to make pwm pulse generator 1 can read and decode.Wireless charging reflector adjusts transmitting power according to feedback signal in good time, improves charge efficiency.
If receiving circuit generation overcurrent or overpressure conditions, the PPM coding circuit 3 in receiver sends cut-off signals to switching regulator IC NCP699, and receiver stops sending feedback information, and charge transport interrupts.
Completing of above function is based on hardware module of the present utility model.
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, Chinese is meant to pulse position modulation, also known as 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], implementation is simple, packet feedback is reliable, through-put power is large, low in energy consumption, support short-range communication, even if transmitting coil and receiving coil still can reliable communications at a distance of 5CM at consistency from top to bottom.And the function such as foreign bodies detection and resonance power automatic tuning can be realized, make electricity high efficiency of transmission, there is higher practicality.
2. be embedded on plank by AC-DC conversion module, directly can obtain electricity from civil power, comparing supply power mode on the market, to be that USB powers reliably more convenient; Adopt full-bridge topology circuit, obtain high transmit power with small voltage; Receiver adopts high-performance dc-dc, makes Maximum Power Output reach 15W.
3. the present invention greatly reduces production cost, is easy to commercialization.
Accompanying drawing explanation
Fig. 1 is the theory diagram of wireless charging device of the present utility model.
Fig. 2 is wireless charging reflector theory diagram.
Fig. 3 is wireless charging receiver theory diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
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 is with characteristic frequency stimulated emission coil, resonance ejection coil produces LC resonance with the resonant capacitance 2 of connecting and generates electromagnetic waves, and described wireless charging receiver receives electromagnetic energy by LC match circuit and passes through DC-DC change-over circuit to lithium cell charging.
Further, the PPM coding circuit of wireless charging receiver is sampled to output voltage and electric current by analog sampling circuit, and by analog signal assembly coding, generate PPM signal by charge information by receiving coil to transmitting coil communication, make wireless charging reflector adjust transmitting power in good time, improve charge efficiency.
As shown in Figure 2, wireless charging reflector comprises AC-DC translation circuit, DC-DC power supply circuits, drive circuit, pwm pulse generator 1, PPM decoding circuit and resonance transmission circuit.
Pwm pulse generator 1 Main Function is: sample to the alternating voltage peak on transmitting coil, finely tunes PWM output pulse frequency, stable resonant oscillation transmitting power; Pulse position modulation digital decoding is carried out to the signal of PPM decoding circuit process; The PWM driving pulse being exported 120kHZ by PCA module exports driving chip to; By detecting the height of sampling and outputting voltage peak-to-peak value, can judge whether emission base has metallic foreign body, if sampled peak voltage is higher than normal pre-set peak value voltage range, then turning off pwm pulse signal, and then stop charging.
AC-DC translation circuit is made up of AC-DC power module and peripheral circuit thereof, mainly completes following function: export 15V direct voltage as wireless charging reflector principal voltage, act on brachium pontis on full-bridge circuit, power output is 15W; For DC-DC power supply circuits are powered.AC-DC power module selects the AKF-15S15 of MinMAX company.
DC-DC power supply circuits primarily of 5V supply module and 3.3V supply module composition, wherein, 5V supply module as pwm pulse generator 1 PWM output signal draw high voltage, and as the input voltage of 3.3V supply module; 3.3V module is that pwm pulse generator 1 is powered.5V supply module selects the TPS54231D switching regulator IC of TI company, and 3.3V supply module selects AMS1117-3.3 chip.
Drive circuit is primarily of full-bridge driving chip and full-bridge topology circuit composition, mainly complete following function: full-bridge chip receives the PWM driving pulse of pwm pulse generator 1, its level is changed and power amplification, export the PWM driving pulse of two-way certain frequency, phase 180 degree, drive the power MOS pipe at the upper and lower diagonal angle of full-bridge circuit respectively.The positive and negative square wave of interchange that full-bridge topology circuit output frequency is 120kHZ, peak-to-peak value is 30V.Wherein, full-bridge driving chip selects the high power driving chip UBA2032T of PHILIPS Co..
Resonance transmission circuit consists of series resonance mode resonant capacitance 2 and resonance ejection coil, mainly completes following functions: resonant capacitance 2 and transmitting coil produce resonance under positive and negative square wave excitation and send electromagnetic wave exchanging; The double communication coil that does of transmitting coil is used.The utility model center operating frequency (i.e. pwm pulse output frequency) is set as 120kHZ, electric capacity and coil according to
carry out parameter matching, LC resonance frequency is 150kHZ.As Primary Component, electric capacity selects the multi-level resonant capacitance of high power, and high Q inductor coil selected by coil.
PPM decoding circuit is primarily of buffer circuit, signal amplification circuit, second order bandwidth-limited circuit, hysteresis comparison circuit composition.Its operation principle: during charging system work, the PPM modulation intelligence that the wireless receiver that PPM decoding circuit reception transmitting coil receives sends is first via the emitter follower Buffer output of amplifier composition, then carry out amplifying and filtering through signal amplification circuit and second order bandwidth-limited circuit, send into hysteresis loop comparator and carry out shaping pulse, the PPM modulation signal of 50kHZ is converted into the pulse signal that pwm pulse generator 1 can read.Circuit is made up of a slice four tunnel amplifier LM324 and peripheral components thereof.
As shown in Figure 3, wireless receiver: form primarily of LC resonant circuit, full bridge rectifier, DC-DC change-over circuit, analog sampling circuit, current sensor, PPM coding circuit 3 and PPM radiating circuit.
In receiver LC resonant circuit, resonant capacitance 4 is connected in a series arrangement with receiving coil, electric capacity and coil according to
carry out parameter matching, parameter matching considers receiving efficiency, and as Primary Component, electric capacity selects the multi-level resonant capacitance of high power, and high Q inductor coil selected by coil.
Full bridge rectifier is overlapped by four Schottky Rectifier SS39 and forms, and carries out rectification to induced voltage.
DC-DC change-over circuit is made up of switching regulator IC and peripheral circuit thereof, and its major function is as follows: the 10V direct voltage chopping depressuring exported by full bridge rectifier to 5V, and charges to lithium battery.Considering that dull and stereotyped lithium cell charging power is the LM2596-5 that 10W, DC-DC switching regulator IC adopts the production of NS company, making receiver be 15W charging normal peak power output in situation.
As shown in Figure 3, analog sampling circuit carries out four tunnel analog samplings to the 5V voltage that dc-dc exports, and four road sampled points are the output charging voltage after dividing potential drop, to improve sampling precision, are beneficial to coding.Sampled voltage is input to PPM coding circuit after RC low-pass filtering, and PPM coding circuit 3 carries out digit pulse modulating-coding (PPM) to four road analog voltages, sends corresponding pulse train, drives PPM radiating circuit.Concrete principle is: first PPM coding circuit 3 exports the frame-synchronizing impulse of one fixed width, then PPM coding circuit 3 is sampled to four road outputting analog signals, four tunnel analog sampling values are averaging, to improve sampling precision, and the mean value obtained are carried out A/D conversion.Then counter carries out subtracting 1 computing, and when counter reduces to 0, PPM coding circuit 3 exports PPM train pulse.Demodulation is dependent on the relative position of each pulse, only need judge that between PPM pulse and lock-out pulse, the time interval just can obtain digital signal during demodulation.PPM coding circuit 3 is sampled to output voltage by analog sampling circuit, and after lithium battery voltage is full of, PPM coding circuit 3 couples of NCP699 send cut-off signals and stop charging action, to protect battery.
PPM radiating circuit is made up of optocoupler and switch MOS pipe: high speed photo coupling receives the pulse train that PPM coding circuit 3 sends, and pulse sequence carries out level power amplification driving switch metal-oxide-semiconductor, switching tube is opened Lou to export and feedback data packet is sent to wireless charging reflector by receiving coil.
Claims (6)
1. a wireless charging reflector, is characterized in that, comprises pwm pulse generator (1), drive circuit, resonance transmission circuit, PPM decoding circuit and power circuit; Pwm pulse generator (1), drive circuit are connected successively with resonance transmission circuit; Resonance transmission circuit is connected with the signal feedback end of pwm pulse generator (1) by PPM decoding circuit, and described pwm pulse generator (1) is all connected with power circuit with drive circuit;
Described drive circuit comprises full-bridge driving chip UBA2032T and full-bridge circuit;
Described resonance transmission circuit comprises transmitting coil and resonant capacitance (2);
Described PPM decoding circuit comprises the buffer circuit, signal amplification circuit, second order bandwidth-limited circuit and the hysteresis comparison circuit that connect 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, described AC-DC translation circuit output voltage is that the upper brachium pontis of full-bridge circuit is powered, and described DC-DC power supply circuits are pwm pulse generator (1) power supply.
2. wireless charging reflector according to claim 1, is characterized in that, described resonance transmission circuit is also directly connected with pwm pulse generator (1).
3. wireless charging reflector according to claim 1 and 2, is characterized in that, described AC-DC translation circuit is directly by mains-supplied.
4. a wireless charging device, is characterized in that, comprises wireless charging reflector and wireless charging receiver, the wireless charging reflector of described wireless charging reflector according to any one of claim 1-3; Described wireless charging receiver comprises resonance receiving circuit, full bridge rectifier, DC-DC change-over circuit, current sensor, lithium battery, analog sampling circuit, PPM coding circuit (3) 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 and current sensor output are all connected with PPM coding circuit (3), PPM coding circuit (3) is connected with PPM radiating circuit, and PPM radiating circuit output is connected with resonance receiving circuit;
Described resonance receiving circuit, comprises receiving coil and resonant capacitance (4).
Described transmitting coil and receiving coil are placed in upper and lower parallel alignment mode, and transmitting coil and receiving coil are communication coil simultaneously.
5. wireless charging device according to claim 4, is characterized in that, described PPM radiating circuit comprises high speed photo coupling and switch MOS pipe, carries out power amplification for the train pulse exported PPM coding circuit (3).
6. wireless charging device according to claim 4, is characterized in that, is also connected with switching regulator IC NCP699 between described full bridge rectifier and PPM coding circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420450334.4U CN204190475U (en) | 2014-08-11 | 2014-08-11 | A kind of wireless charging reflector and wireless charging device |
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| CN201420450334.4U CN204190475U (en) | 2014-08-11 | 2014-08-11 | A kind of wireless charging reflector and wireless charging device |
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| CN201420450334.4U Expired - Fee Related CN204190475U (en) | 2014-08-11 | 2014-08-11 | A kind of wireless charging reflector and wireless charging device |
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| CN104158269A (en) * | 2014-08-11 | 2014-11-19 | 长城信息产业股份有限公司 | Wireless charging transmitter, receiver, charging device and wireless charging method |
| CN105684259A (en) * | 2015-10-23 | 2016-06-15 | 陈银芳 | Handset wireless charging method and system |
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| CN107171450A (en) * | 2017-06-16 | 2017-09-15 | 江苏嘉钰新能源技术有限公司 | A kind of electromagnetic coupled formula wireless charging system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |