CN105471021A - Energy sending terminal device in wireless charging system - Google Patents
Energy sending terminal device in wireless charging system Download PDFInfo
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- CN105471021A CN105471021A CN201510794833.4A CN201510794833A CN105471021A CN 105471021 A CN105471021 A CN 105471021A CN 201510794833 A CN201510794833 A CN 201510794833A CN 105471021 A CN105471021 A CN 105471021A
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Abstract
The invention relates to an energy sending terminal device in a wireless charging system. The device comprises a main control chip used for controlling an ADC module for sampling a series oscillation signal of an LC oscillation circuit and controlling a sending end according to output of the ADC module, a driving module used for realizing control on an MOS module according to a PWM driving signal generated by the main control chip, an MOS tube module used for controlling output of an MOS tube for being connected with the power source or being in grounding connection, and the ADC module used for sampling the series oscillation signal of the LC oscillation circuit. Through the energy sending terminal device in the wireless charging system, mutual conversion between a full bridge driving mode and a half bridge driving mode can be realized, the output power scope is relatively large, relatively small energy adjustment stepping can be further maintained in the conversion process, energy jump caused by forced conversion is avoided, seamless switching is realized, and problems that small power signals are not good for digital demodulation decoding when the same system realizes power supply in a voltage full bridge driving mode, and lower energy is provided when power supply is realized in a half bridge driving mode are solved.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to wireless charging, specifically refer to energy transmitting terminal device in a kind of wireless charging system.
Background technology
Current wireless power supply system is converted into basis mutually with electromagnetic field, change direct current into alternating current, the electric current of alternation produces the magnetic field of alternation by inductance coil, when the inductance coil of a closed loop is placed on the electric current that will induce alternation in the magnetic field of alternation, obtain direct current after rectification.In order to stable power-supplying, the receiving terminal of energy and transmitting terminal need mutual communication adjustment power output, useful signal (comprising power increase, reduction etc.) is modulated to the elect magnetic field mutually transformed by the mode that receiving terminal is modulated with AM, transmitting terminal carries out demodulating and decoding to the useful signal on inductance coil, and then regulation output power.On inductance coil, AM modulation signal has interference in various degree, and therefore adopt digital demodulation can obtain better result, digital demodulation is convenient to integrated chip simultaneously, eliminates analog component, cost-saving.
The oscillating circuit that the mode that wireless power supply system energy transmitting terminal adopts metal-oxide-semiconductor switching circuit direct current to be converted to alternating current is inductance coil L, electric capacity C is composed in series provides energy, and inductance L p can flow through the electric current of alternation, thus produces the magnetic field of alternation.When LC one end drives for alternating current, be half-bridge driven pattern time another termination fixed level (ground connection or power supply), as shown in Figure 1; Be full-bridge drive pattern when LC two ends drive for alternating current simultaneously, as shown in Figure 2.
Duty cycle adjustment for a change VC duty ratio, VL is the reverse level of VC, causes the duty ratio of oscillator signal to change (as shown in Figure 4), is unfavorable for that digital demodulation is decoded.
To sum up, the power that in prior art, half-bridge driven pattern provides compared with full-bridge drive pattern in identical systems condition due to single-ended drive is few, if change driving signal frequency, make it the resonance frequency close to LC, can improve power output, but now change minimum frequency step, power output changes larger, controlerror in communication process cannot be adjusted to 0, and system just cannot provide a stable output power.
In prior art, full-bridge drive pattern can the power output of regulating system by changing the frequency of drive singal, duty ratio and LC both end voltage phase place, if system needs to provide a less power, and now frequency has arrived the adjustable maximum of standard, can continue by regulating duty ratio or phase place to reduce power output, but along with the intensification regulated, oscillator signal duty ratio changes, cause signal digital demodulating and decoding unsuccessful when changing greatly, cannot set up communication, system power supply disconnects.
Summary of the invention
The object of the invention is the shortcoming overcoming above-mentioned prior art, provide a kind of can solve can not to provide stable under half-bridge driven pattern can not provide stable larger power output and full-bridge drive pattern smaller power problem, full-bridge drive pattern and half-bridge driven pattern power output seamless switching can be realized simultaneously, meet different occasion under to energy transmitting terminal device in the wireless charging system of wireless power supply system power output demand.
To achieve these goals, in wireless charging system of the present invention, energy transmitting terminal device has following formation:
Energy transmitting terminal device in this wireless charging system, its main feature is, described energy transmitting terminal device comprises:
Main control chip, in order to the serial oscillation signal in control ADC module samples LC oscillating circuit, and the energy transmitting terminal device described in controlling according to the output of described ADC module;
Driver module, the PWM drive singal in order to produce according to described main control chip realizes the control to metal-oxide-semiconductor module;
Metal-oxide-semiconductor module, exports in order to make metal-oxide-semiconductor according to the control signal of described driver module and connects power supply or ground connection;
ADC module, in order to the serial oscillation signal of sampling in LC oscillating circuit.
Further, described energy transmitting terminal device also comprises a bleeder circuit, in order to obtain in described LC oscillating circuit the signal after dividing potential drop in proportion, the signal after dividing potential drop is in proportion sent to described ADC module, to decode to signal of communication and to encode by described bleeder circuit.
Further, described metal-oxide-semiconductor module comprises two N-type metal-oxide-semiconductors; Or described metal-oxide-semiconductor module comprises a P type metal-oxide-semiconductor and a N-type metal-oxide-semiconductor.
Further, the drive singal that capacitance terminal in described LC oscillating circuit connects to be duty ratio be 50% drive singal, the drive singal that the inductance end in described LC oscillating circuit connects is the drive singal of duty ratio between 0 to 50%.
Have employed energy transmitting terminal device in the wireless charging system in this invention, compared with prior art, there is following Advantageous Effects:
(1) in wireless charging system of the present invention, energy transmitting terminal device can realize mutually being changed by full-bridge drive pattern, half-bridge driven pattern, output power range is large, in transfer process, keep less energy adjustment stepping simultaneously, be unlikely to change by force to cause energy jump, realize seamless switching.
(2) in wireless charging system of the present invention, the energy transmitting terminal device drive singal that capacitance terminal connects in adjustment process keeps 50% duty ratio always, make the oscillator signal on inductance coil also keep 50% duty ratio constant, be conducive to the digital demodulation decoding of signal of communication.
Accompanying drawing explanation
Fig. 1 is the structural representation of the wireless power supply system energy transmitting terminal of half-bridge driven pattern in prior art.
Fig. 2 is the structural representation of the wireless power supply system energy transmitting terminal of full-bridge drive pattern in prior art.
The oscillogram of VS oscillator signal when Fig. 3 is drive singal 50% duty ratio in prior art.
The oscillogram of VS oscillator signal when Fig. 4 is drive singal 20% duty ratio in prior art.
Fig. 5 is the structural representation of energy transmitting terminal in the wireless power supply system in the present invention.
Fig. 6 is the oscillogram of the drive singal of LC oscillating circuit under the half-bridge driven pattern in the present invention.
Fig. 7 is the oscillogram of the drive singal of LC oscillating circuit under the full-bridge drive pattern in the present invention.
Fig. 8 a to Fig. 8 d is the oscillogram of the full-bridge drive pattern in the embodiment in the present invention to half-bridge driven mode transition procedure.
Fig. 9 a to Fig. 9 b is the oscillogram of the full-bridge drive pattern in the embodiment in the present invention to half-bridge driven mode transition procedure.
Embodiment
In order to more clearly describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Refer to shown in Fig. 5 to Fig. 9 b, in the wireless charging system in the present invention, energy transmitting terminal device comprises:
Main control chip, in order to the serial oscillation signal in control ADC module samples LC oscillating circuit, and the transmitting terminal described in controlling according to the output of described ADC module;
Driver module, the PWM drive singal in order to produce according to described main control chip realizes the control to metal-oxide-semiconductor module;
Metal-oxide-semiconductor module, exports in order to make metal-oxide-semiconductor according to the control signal of described driver module and connects power supply or ground connection;
ADC module, in order to the serial oscillation signal of sampling in LC oscillating circuit.
In actual applications, please specifically shown in Figure 5, in the wireless charging system in the present invention, energy transmitting terminal device comprises:
1, main control chip
Main control chip is control ADC module samples Cp and LP serial oscillation signal on the one hand, carries out demodulating and decoding to signal of communication; The information obtained according to demodulating and decoding on the other hand controls transmitting system.Main control chip produces adjustable PWM drive singal, controls metal-oxide-semiconductor and opens shutoff, realizes power output and regulates.
2, MOSdriver (driver module)
Metal-oxide-semiconductor drives and mainly realizes level conversion.The PWM drive singal high level 3.3V that main control chip produces, low level 0V, can not realize opening and turning off MOS function.For two NMOS and PMOS+NMOS composition to tubular construction, driving chip is different, but practical function is identical.
3, metal-oxide-semiconductor module
PWM drive singal controls to open and turn off metal-oxide-semiconductor, metal-oxide-semiconductor is exported and connects supply voltage or connect ground, and in Fig. 5, metal-oxide-semiconductor output voltage VC and VL drives the oscillating circuit of electric capacity and inductance composition.
4, ADC module
LC serial oscillation voltage does not need bleeder circuit more low level time, when it reaches very high level, needs through a bleeder circuit, and the signal after dividing potential drop is in proportion sent into ADC, and the digital signal collected is sent into main control chip and used.
In a preferred embodiment, described energy transmitting terminal device also comprises a bleeder circuit, in order to obtain in described LC oscillating circuit the signal after dividing potential drop in proportion, signal after dividing potential drop is in proportion sent to described ADC module, to decode to signal of communication and to encode by described bleeder circuit.
In a preferred embodiment, described metal-oxide-semiconductor module comprises two N-type metal-oxide-semiconductors; Or described metal-oxide-semiconductor module comprises a P type metal-oxide-semiconductor and a N-type metal-oxide-semiconductor.
In a preferred embodiment, the drive singal that capacitance terminal in described LC oscillating circuit connects to be duty ratio be 50% drive singal, the drive singal that the inductance end in described LC oscillating circuit connects is the drive singal of duty ratio between 0 to 50%.
Refer to shown in Fig. 6 and Fig. 9 b, in power output adjustment process, capacitance terminal keeps 50% duty ratio, and inductance end regulates the type of drive of duty ratio.LC oscillating circuit drive singal VC and VL:
1), half-bridge driven pattern
As shown in Figure 6, VC end connects duty ratio 50% square wave, amplitude is the alternating current drive signal of system voltage, and VL end connects ground, forms half-bridge driven pattern.
2), full-bridge drive pattern
As shown in Figure 7, VC and VL holds complete reverse duty ratio 50% square wave of connection two, amplitude is the alternating current drive signal of system voltage, forms full-bridge drive pattern.
3), full-bridge drive pattern is to half-bridge driven mode-conversion
As shown in Fig. 8 a to 8d, the alternating current drive signal that VC holds duty ratio 50% square wave, amplitude is system voltage is constant, and VL holds alternating current drive signal by 50% duty ratio to more low duty ratio direction adjustment.
VL duty ratio is reduced in Fig. 7 full-bridge mode, become Fig. 8 a, continue to reduce duty ratio-> Fig. 8 b> Fig. 8 c, when VL duty ratio is adjusted to 0, transfer process-> Fig. 8 d, completes full-bridge and switches to half-bridge driven pattern.Half-bridge driven pattern transforms to full-bridge drive pattern can according to Fig. 8 d-> Fig. 8 c-> Fig. 8 b-> Fig. 8 a adjustment process, finally switch to full-bridge mode, wherein symbol-> represents and changes, namely Fig. 8 b> Fig. 8 c, represents and is converted to Fig. 8 c from Fig. 8 b.
In Fig. 8 a to Fig. 8 d transfer process, VL also can the low level center of non complete symmetry VC, and as shown in Fig. 9 a to 9b, but waveform that duty ratio obtains is desirable not have symmetric mode to reduce.
Energy transmitting terminal device in wireless charging system in this invention, compared with prior art, has following Advantageous Effects:
(1) in wireless charging system of the present invention, energy transmitting terminal device can realize mutually being changed by full-bridge drive pattern, half-bridge driven pattern, output power range is large, in transfer process, keep less energy adjustment stepping simultaneously, be unlikely to change by force to cause energy jump, realize seamless switching.
(2) in wireless charging system of the present invention, the energy transmitting terminal device drive singal that capacitance terminal connects in adjustment process keeps 50% duty ratio always, make the oscillator signal on inductance coil also keep 50% duty ratio constant, be conducive to the digital demodulation decoding of signal of communication.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (4)
1. an energy transmitting terminal device in wireless charging system, is characterized in that, described energy transmitting terminal device comprises:
Main control chip, in order to the serial oscillation signal in control ADC module samples LC oscillating circuit, and the energy transmitting terminal device described in controlling according to the output of described ADC module;
Driver module, according to the control of PWM drive singal realization to metal-oxide-semiconductor module that described main control chip produces;
Metal-oxide-semiconductor module, makes metal-oxide-semiconductor export according to the control signal of described driver module and connects power supply or ground connection;
ADC module, in order to the serial oscillation signal of sampling in LC oscillating circuit.
2. energy transmitting terminal device in wireless charging system according to claim 1, it is characterized in that, described energy transmitting terminal device also comprises a bleeder circuit, in order to obtain in described LC oscillating circuit the signal after dividing potential drop in proportion, signal after dividing potential drop is in proportion sent to described ADC module, to decode to signal of communication and to encode by described bleeder circuit.
3. energy transmitting terminal device in wireless charging system according to claim 1, is characterized in that, described metal-oxide-semiconductor module comprises two N-type metal-oxide-semiconductors; Or described metal-oxide-semiconductor module comprises a P type metal-oxide-semiconductor and a N-type metal-oxide-semiconductor.
4. energy transmitting terminal device in wireless charging system according to claim 1, it is characterized in that, the drive singal that capacitance terminal in described LC oscillating circuit connects to be duty ratio be 50% drive singal, the drive singal that the inductance end in described LC oscillating circuit connects is the drive singal of duty ratio between 0 to 50%.
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| CN201510794833.4A CN105471021A (en) | 2015-11-18 | 2015-11-18 | Energy sending terminal device in wireless charging system |
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| CN201510794833.4A CN105471021A (en) | 2015-11-18 | 2015-11-18 | Energy sending terminal device in wireless charging system |
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Cited By (5)
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| CN107634588A (en) * | 2017-11-07 | 2018-01-26 | 无锡华润矽科微电子有限公司 | Control the method and system of pulse voltage stability in oscillating circuit |
| WO2018076690A1 (en) * | 2015-10-30 | 2018-05-03 | 深圳市易冲无线科技有限公司 | Adaptive power amplifier for optimizing wireless power transmission |
| CN112202354A (en) * | 2020-08-27 | 2021-01-08 | 无锡市瀚为科技有限公司 | H-bridge power control method |
| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
| CN114347814A (en) * | 2020-10-13 | 2022-04-15 | 许继集团有限公司 | Ground terminal mode soft switching method and system for wireless charging system of electric vehicle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018076690A1 (en) * | 2015-10-30 | 2018-05-03 | 深圳市易冲无线科技有限公司 | Adaptive power amplifier for optimizing wireless power transmission |
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| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
| CN112202354A (en) * | 2020-08-27 | 2021-01-08 | 无锡市瀚为科技有限公司 | H-bridge power control method |
| CN114347814A (en) * | 2020-10-13 | 2022-04-15 | 许继集团有限公司 | Ground terminal mode soft switching method and system for wireless charging system of electric vehicle |
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