CN101860087B - Method and system for improving wireless energy transmission efficiency by using feedback tuning method - Google Patents
Method and system for improving wireless energy transmission efficiency by using feedback tuning method Download PDFInfo
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- CN101860087B CN101860087B CN2010101694647A CN201010169464A CN101860087B CN 101860087 B CN101860087 B CN 101860087B CN 2010101694647 A CN2010101694647 A CN 2010101694647A CN 201010169464 A CN201010169464 A CN 201010169464A CN 101860087 B CN101860087 B CN 101860087B
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Abstract
The invention discloses a method and a system for improving wireless energy transmission efficiency by using a feedback tuning method. The system comprises a phase-locked loop oscillating circuit, a drive amplifying circuit, a transmitting resonant circuit, a current extracting circuit, a receiving and tuning circuit, a rectifying and filtering circuit and a digital control circuit. The method comprises the following steps of: transmitting the output frequency of the oscillating circuit at the transmitting end and locking the frequency on the oscillation frequency of the transmitting resonant circuit in a phase-locked loop way; controlling the resonant frequency of the receiving and tuning circuit at the receiving end in a digital feedback way according to the output of the rectifying and filtering circuit; and coupling the transmitting end and the receiving end by a magnetic field. The output frequency of the phase-locked loop oscillating circuit and the resonant frequency of the receiving and tuning circuit are self-adaptively tuned on the resonant frequency of the transmitting resonant circuit, thereby improving the voltage output frequency of a wireless energy transmission system.
Description
Technical field
The present invention relates to the method and system that a kind of feedback tuning method improves wireless energy transmission efficiency.
Background technology
For a long time, China's electric power is carried and is mainly realized through wire transmission.It is complicated that it has wiring, uses shortcomings such as inconvenience.In recent years, along with continuous progress in science and technology, the wireless mode transmission of power has been brought into use in fields such as household electrical appliance power supply, battery charge, radio frequency identification gradually.
Wireless energy transfer is to utilize the magnetic resonance principle, electric energy is coupled to from the emission resonant circuit receive on the resonant circuit.When factors such as ambient temperature, system load and transmission range changed, the resonance frequency of emission resonant circuit received the resonance frequency meeting of resonant circuit and the output frequency of oscillating circuit and produces deviation, and this will badly influence the efficiency of transmission of system.
Summary of the invention
The object of the present invention is to provide a kind of feedback tuning method to improve the method and system of wireless energy transmission efficiency; Adaptively with the output frequency of phase-locked loop oscillating circuit and the resonance frequency that receives tuning circuit; Be tuned on the resonance frequency of emission oscillating circuit, thereby improve the efficiency of transmission of wireless energy transfer system.
The technical scheme that the present invention adopts is:
One, a kind of feedback tuning method improves the method for wireless energy transmission efficiency:
The present invention is at transmitting terminal, and the output frequency of emission oscillating circuit uses phase-locked loop manner, with frequency lock on the frequency of oscillation of emission resonant circuit; At receiving terminal, according to the output of current rectifying and wave filtering circuit, use the digital feedback mode, control receives the resonance frequency of tuning circuit; Transmitting terminal and receiving terminal are realized through the magnetic field coupling; Output frequency that makes the phase-locked loop oscillating circuit and the resonance frequency that receives tuning circuit, all adaptively be tuned on the resonance frequency of emission resonant circuit, thereby improve the voltage delivery efficiency of wireless energy transfer system.
Two, a kind of feedback tuning method improves the system of wireless energy transmission efficiency:
The present invention includes the phase-locked loop oscillating circuit, drive amplifying circuit, launch resonant circuit, current extracting circuit, reception tuning circuit, current rectifying and wave filtering circuit and digital control circuit; The phase-locked loop oscillating circuit is connected with the phase-locked loop oscillating circuit through driving amplifying circuit, emission resonant circuit, current extracting circuit again; Receive tuning circuit and be connected the output of current rectifying and wave filtering circuit voltage again with the reception tuning circuit with digital control circuit through current rectifying and wave filtering circuit; Magnetic field coupling between emission resonant circuit and reception tuning circuit.
Described phase-locked loop oscillating circuit is the phase-locked loop oscillating circuit that CD4046 builds, and uses chip CD4046, its IN termination current extracting circuit, and its OUT termination drives amplifying circuit.
Described driving amplifying circuit is that category-B drives amplifying circuit; Resonant circuit is penetrated in the back sending and receiving that link to each other with the PNP triode of the emitter of its NPN triode, the negative pole of an one of which diode D1 and another diode D2 the positive pole OUT that connects the phase-locked loop oscillating circuit after linking to each other hold.
Described emission resonant circuit is 3 couplings of inductance coil L1 and capacitor C, and capacitor C 3 connects the port that the emitter that drives amplifying circuit NPN triode links to each other with the PNP triode, and inductance coil L1 connects current extracting circuit.
Described current extracting circuit is the mutual inductance type current extracting circuit, and resonant circuit inductance coil L1 port is penetrated in the first port sending and receiving on its limit, Central Plains, and the 4th port of secondary connects the IN end of phase-locked loop oscillating circuit.
Described reception tuning circuit is inductance coil L2 and tunable capacitor VC coupling, output termination current rectifying and wave filtering circuit and digital control circuit.
Described current rectifying and wave filtering circuit, the positive termination of its diode D3 receives the tuning circuit output, and tunable capacitor VC holds as voltage output end, is connected with digital control circuit simultaneously.
Described digital control circuit is the digital control circuit that MSP430F2013 builds, the ADC1 termination current rectifying and wave filtering circuit tunable capacitor VC end of chip MSP430F2013, and P1.5 end and TA1 end are connected to current rectifying and wave filtering circuit tunable capacitor VC end as interface J2.
The signal work path is following: the high-frequency oscillation signal that the phase-locked loop oscillating circuit produces behind overdriven amplifier, flows to the emission resonant circuit; Receive tuning circuit and utilize the magnetic resonance principle, the portion of energy that from the emission resonant tank, is coupled out produces higher-order of oscillation electric current; Current rectifying and wave filtering circuit is a direct voltage with higher-order of oscillation current conversion.When factors such as ambient temperature, system load or transmission range changed, the resonance frequency of emission resonant circuit can produce deviation between the resonance frequency meeting of reception resonant circuit and the output frequency of oscillating circuit, has influence on system transmissions efficient.At transmitting terminal, current extracting circuit is extracted the electric current through the emission resonant circuit, utilizes PHASE-LOCKED LOOP PLL TECHNIQUE that the output frequency of oscillating circuit is locked on the resonance frequency of emission resonant circuit afterwards; At receiving terminal, digital control circuit constantly detects the output voltage of current rectifying and wave filtering circuit, and feedback effect changes the resonance frequency that receives tuning circuit on the tunable capacitor that receives tuning circuit, makes the output of current rectifying and wave filtering circuit progressively reach maximum.
The beneficial effect that the present invention has:
The present invention proposes the method and system realization that a kind of feedback tuning method improves wireless energy transmission efficiency.When the resonance frequency of emission resonant circuit changes with factors such as ambient temperature, system load or transmission ranges; Utilize PHASE-LOCKED LOOP PLL TECHNIQUE; Lock onto the output frequency of oscillating circuit on the resonance frequency of emission resonant circuit, solve the frequency detuning problem of transmitting terminal.For receiving terminal, then, utilize the mode of digital feedback through constantly detecting the output of current rectifying and wave filtering circuit, regulate the resonance frequency that receives tuning circuit, make the output of current rectifying and wave filtering circuit finally reach maximum.Through above method, with the output frequency of phase-locked loop oscillating circuit and the resonance frequency that receives tuning circuit, adaptively be tuned on the resonance frequency of emission oscillating circuit, thereby improve the efficiency of transmission of wireless energy transfer system.
Description of drawings
Fig. 1 is the theory diagram that the present invention realizes.
Fig. 2 is the phase-locked loop oscillating circuit schematic diagram that CD4046 builds.
Fig. 3 is that category-B drives the amplifying circuit schematic diagram.
Fig. 4 is an emission resonant circuit schematic diagram.
Fig. 5 is a mutual inductance type current extracting circuit schematic diagram.
Fig. 6 receives the tuning circuit schematic diagram.
Fig. 7 is a halfwave rectifier filter circuit schematic diagram.
Fig. 8 is the digital control circuit schematic diagram that MSP430F2013 builds.
Among the figure: 1 phase-locked loop oscillating circuit, 2 drives amplifying circuit, 3 emission resonant circuits, 4 current extracting circuit, 5 reception tuning circuit, 6 current rectifying and wave filtering circuits and 7 digital control circuits.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
As shown in Figure 1, the present invention includes phase-locked loop oscillating circuit 1, driving amplifying circuit 2, emission resonant circuit 3, current extracting circuit 4, receive tuning circuit 5, current rectifying and wave filtering circuit 6 and digital control circuit 7; Phase-locked loop oscillating circuit 1 is connected with phase-locked loop oscillating circuit 1 through driving amplifying circuit 2, emission resonant circuit 3, current extracting circuit 4 again; Receive tuning circuit 5 and be connected the output of current rectifying and wave filtering circuit 6 voltages again with reception tuning circuit 5 with digital control circuit 7 through current rectifying and wave filtering circuit 6; 5 magnetic fields couplings of emission resonant circuit 3 and reception tuning circuit.
Phase-locked loop oscillating circuit as shown in Figure 2, that phase-locked loop oscillating circuit 1 is built for CD4046 uses chip CD4046, its IN termination current extracting circuit 4, and its OUT termination drives amplifying circuit 2.
As shown in Figure 3; Drive amplifying circuit 2 and drive amplifying circuit for category-B; Resonant circuit 3 is penetrated in the back sending and receiving that link to each other with the PNP triode of the emitter of its NPN triode, the negative pole of an one of which diode D1 and another diode D2 the positive pole OUT that connects phase-locked loop oscillating circuit 1 after linking to each other hold.
As shown in Figure 4, emission resonant circuit 3 be inductance coil L1 and capacitor C 3 is coupled, and capacitor C 3 connects the port that the emitter of driving amplifying circuit NPN triode links to each other with the PNP triode, and inductance coil L1 connects current extracting circuit 4.
As shown in Figure 5, described current extracting circuit 4 is the mutual inductance type current extracting circuit, and resonant circuit 3 inductance coil L1 ports are penetrated in the first port sending and receiving on its limit, Central Plains, and the 4th port of secondary connects the IN end of phase-locked loop oscillating circuit 1.
As shown in Figure 6, described reception tuning circuit 5 is inductance coil L2 and tunable capacitor VC coupling, output termination current rectifying and wave filtering circuit 6 and digital control circuit 7.
As shown in Figure 7, current rectifying and wave filtering circuit 6, the positive termination of its diode D3 receives tuning circuit 5 outputs, and capacitor C 4 ends are connected with digital control circuit 7 as voltage output end simultaneously.
As shown in Figure 8; The digital control circuit that digital control circuit 7 is built for MSP430F2013; The ADC1 termination current rectifying and wave filtering circuit 6 tunable capacitor VC end of chip MSP430F2013, P1.5 end and TA1 end are connected to current rectifying and wave filtering circuit 6 tunable capacitor VC end as interface J2.
A) oscillator signal of the CF of phase-locked loop oscillating circuit generation.
B) drive amplifying circuit, the high-frequency oscillation signal that a last step is produced carries out power amplification, is used for wireless transmission so that enough energy to be provided.
C) the emission tuning circuit is a magnetic field energy with the power conversion of high-frequency oscillation signal.
D) receive the mode of tuning circuit, from the magnetic field of cycle variation, be coupled to portion of energy, and convert higher-order of oscillation electric current into through magnetic resonance.
E) current rectifying and wave filtering circuit is a direct voltage with higher-order of oscillation current conversion.
When f) factors such as ambient temperature, system load or transmission range changed, the resonance frequency of emission resonant circuit received the resonance frequency meeting of resonant circuit and the output frequency of oscillating circuit and produces deviation.
G) at transmitting terminal, current extracting circuit is extracted the electric current through the emission resonant circuit.Utilize PHASE-LOCKED LOOP PLL TECHNIQUE that the output frequency of oscillating circuit is locked on the resonance frequency of emission resonant circuit afterwards.
H) at receiving terminal, digital control circuit constantly detects the output voltage of current rectifying and wave filtering circuit, and feedback effect changes its resonance frequency on the tunable capacitor that receives tuning circuit.Make the output of current rectifying and wave filtering circuit reach maximum.
I) through step g and h, adaptively with the output frequency and the resonance frequency that receives tuning circuit of phase-locked loop oscillating circuit, be tuned on the resonance frequency of emission oscillating circuit, thereby reduce the influence of extraneous factor to system transmissions efficient.
Below concrete execution mode of setting forth various piece:
The phase-locked loop oscillating circuit selects for use the integrated phase lock chip to build, and is as shown in Figure 2 like the circuit theory diagrams that use chip CD4046 to build.
Drive amplifying circuit and use category-B, D class or E class power amplification circuit.When using class B push-pull complementation amplifying circuit, circuit theory diagrams are as shown in Figure 3.This circuit framework can provide enough power outputs on the one hand, can reduce the influence of its output impedance to the emission tank circuit factor on the other hand.
The emission tuning circuit uses series resonant circuit, and is as shown in Figure 4.Wherein, inductance coil L1 uses the enamelled wire coiling hollow inductance that spirals, and perhaps on circuit board, prints planar spiral inductor; Capacitor C 3 is used fixed capacity.
Current extracting circuit is used the mutual inductance type current extracting circuit, and is as shown in Figure 5; Perhaps be suitable for the photoelectric coupling type current extracting circuit.In order to reduce its influence, play the effect of isolation to the emission tank circuit factor.
Receive tuning circuit and use antiresonant circuit, as shown in Figure 6.Wherein, inductance coil L2 uses the enamelled wire coiling hollow inductance that spirals, and perhaps on circuit board, prints planar spiral inductor; Tunable capacitor VC uses high-power fixed capacity to constitute with the parallelly connected mode of electric tunable electric capacity (like the MAX1474 of MAXIM company production).
Current rectifying and wave filtering circuit uses half-wave rectifying circuit in low-power applications, as shown in Figure 7; In high-power applications, use full-wave rectifying circuit.
Digital control circuit uses the low-power scm of band analog-digital conversion function to realize that like the chip MSP430F2013 that uses TexasInstruments company to produce, its circuit theory diagrams are as shown in Figure 8.Wherein, analog-digital conversion function is used to gather the output voltage of current rectifying and wave filtering circuit; The J1 interface is the SpyBiWire interface, is used for mcu programming; The J2 interface is used for controlling the tunable capacitor that receives tuning circuit.
Claims (2)
1. a feedback tuning method improves the method for wireless energy transmission efficiency, it is characterized in that: at transmitting terminal, the output frequency of emission oscillating circuit uses phase-locked loop manner, with frequency lock on the frequency of oscillation of emission resonant circuit; At receiving terminal, digital control circuit constantly detects the output voltage of current rectifying and wave filtering circuit, and feedback effect changes its resonance frequency on the tunable capacitor that receives tuning circuit; Transmitting terminal and receiving terminal are realized through the magnetic field coupling; Output frequency that makes the phase-locked loop oscillating circuit and the resonance frequency that receives tuning circuit, all adaptively be tuned on the resonance frequency of emission resonant circuit, thereby improve the voltage delivery efficiency of wireless energy transfer system.
2. improve the system of wireless energy transmission efficiency by a kind of feedback tuning method of the said method of claim 1, comprise phase-locked loop oscillating circuit (1), driving amplifying circuit (2), emission resonant circuit (3), current extracting circuit (4), receive tuning circuit (5), current rectifying and wave filtering circuit (6) and digital control circuit (7); Phase-locked loop oscillating circuit (1) is connected with phase-locked loop oscillating circuit (1) through driving amplifying circuit (2), emission resonant circuit (3), current extracting circuit (4) again; Receive tuning circuit (5) and be connected the output of current rectifying and wave filtering circuit (6) voltage through current rectifying and wave filtering circuit (6) with digital control circuit (7) again with reception tuning circuit (5); Magnetic field coupling between emission resonant circuit (3) and reception tuning circuit (5); It is characterized in that:
The phase-locked loop oscillating circuit that described phase-locked loop oscillating circuit (1) is built for CD4046 uses chip CD4046, its IN termination current extracting circuit (4), and its OUT termination drives amplifying circuit (2);
Described driving amplifying circuit (2) drives amplifying circuit for category-B; Resonant circuit (3) is penetrated in the back sending and receiving that link to each other with the PNP triode of the emitter of its NPN triode, and the negative pole of an one of which diode D1 is held with the OUT that connects phase-locked loop oscillating circuit (1) after the positive pole of another diode D2 links to each other;
Described emission resonant circuit (3) is 3 couplings of inductance coil L1 and capacitor C, and capacitor C 3 connects the port that the emitter that drives amplifying circuit (2) NPN triode links to each other with the PNP triode, and inductance coil L1 connects current extracting circuit (4);
Described current extracting circuit (4) is the mutual inductance type current extracting circuit, and resonant circuit (3) inductance coil L1 port is penetrated in the first port sending and receiving on its limit, Central Plains, and the 4th port of secondary connects the IN end of phase-locked loop oscillating circuit (1);
Described reception tuning circuit (5) is inductance coil L2 and tunable capacitor VC coupling, output termination current rectifying and wave filtering circuit (6) and digital control circuit (7);
Described current rectifying and wave filtering circuit (6), the positive termination of its diode D3 receives tuning circuit (5) output, and capacitor C 4 ends are connected with digital control circuit (7) as voltage output end simultaneously;
The digital control circuit that described digital control circuit (7) is built for MSP430F2013; ADC1 termination current rectifying and wave filtering circuit (6) the tunable capacitor VC end of chip MSP430F2013; P1.5 end and TA1 end are connected to current rectifying and wave filtering circuit (6) tunable capacitor VC end as interface J2.
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| CN2010101694647A CN101860087B (en) | 2010-05-11 | 2010-05-11 | Method and system for improving wireless energy transmission efficiency by using feedback tuning method |
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| CN102412635A (en) * | 2011-12-28 | 2012-04-11 | 东南大学 | Wireless power supply device of mobile equipment |
| CN102780275A (en) * | 2012-08-03 | 2012-11-14 | 电子科技大学 | Magnetic resonance coupling wireless energy transmission system |
| CN104135085B (en) * | 2014-07-23 | 2016-06-15 | 西南交通大学 | A kind of wireless power transmission equipment transmitting terminal frequency-tracking tuning methods |
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| CN105245035A (en) * | 2015-11-04 | 2016-01-13 | 华东交通大学 | Frequency changer circuit based on magnetic resonance coupling wireless power transmission |
| CN107093929B (en) * | 2017-03-24 | 2021-10-22 | 哈尔滨工业大学深圳研究生院 | Coupling resonant underwater wireless charging device and method |
| CN109038850B (en) | 2018-06-25 | 2020-07-24 | 华为技术有限公司 | Device, equipment and method for detecting metal foreign matters in wireless charging system |
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